JP7522833B2 - Spectacle plate for concrete pump truck, preparation method thereof and concrete pump truck - Google Patents

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese Patent Application No. 202111325943.8, filed on November 10, 2021, the disclosure of which is incorporated herein by reference in its entirety.

The present disclosure relates to the field of engineering machinery, and in particular to a spectacle plate for a concrete pump truck, a method for preparing the same, and a concrete pump truck.

The spectacle plate is a wear part of the concrete pump truck. During pumping, the spectacle plate and the cutting ring move back and forth alternately to perform a relative cutting motion to realize the suction and supply of materials. The spectacle plate not only needs to have good wear resistance, but also needs to have a certain impact resistance and fatigue resistance.

In some related art, the spectacle plate is prepared by embedding a cemented carbide in a crude steel substrate. The spectacle plate can be a single alloy + inner hole surfacing structure, a dual alloy + inner hole surfacing structure, an all-alloy structure, etc., which makes the cut and material passing surfaces of the spectacle plate wear resistant while ensuring overall impact resistance, thus extending the service life of the part.

The cemented carbide and the crude steel substrate can be joined by brazing. However, whether it is single alloy, dual alloy or full alloy, the crude steel substrate is joined with the cemented carbide by copper brazing, and the spectacle plate prepared in this way has the following problems: (1) In long-term use, the wear resistance of the crude steel substrate and the copper brazing gap is low, and the cemented carbide part is exposed after wear, causing cracks due to the impact wear of the concrete stone, and the non-wear-resistant crude steel substrate is prone to direct contact with the concrete, which leads to slurry leakage during transportation, and further serious wear of the spectacle plate, and even premature failure, resulting in the need for shutdown for part replacement, which affects the progress of construction. (2) From the viewpoint of production and processing, there are many production procedures to produce the spectacle plate of the alloy inlaid structure, including crude steel blanking, alloy groove cutting, alloy formwork preparation, brazing, surfacing, alloy surface grinding, drilling, inspection, paint spraying, etc. (3) The purchase cost of cemented carbide is high, typically accounting for 60% to 80% of the price of the entire spectacle plate, resulting in high costs for the entire spectacle plate components.

In one aspect of the present disclosure,
A substrate including two through holes, a ridge portion, and two arc portions, the ridge portion being disposed between the two through holes, and the two arc portions and the ridge portion forming the two through holes;
a first wear-resistant body including a plurality of first portions and a second portion, each of the two through holes being provided with one of the plurality of first portions, the first portion being connected to the ridge portion, and the second portion being disposed on a surface of the ridge portion and located between the two through holes;
two second wear resistant bodies, each of the two through holes includes one of the two second wear resistant bodies, and the two second wear resistant bodies are respectively connected to the two arc portions;
The wear resistance of the first wear body is greater than the wear resistance of the second wear body, and the wear resistance of the second wear body is greater than the wear resistance of the substrate;
A spectacle plate for a concrete pump truck is provided.

In some embodiments, the second wear body includes a third portion and a fourth portion, the third portion being disposed within the through hole and the fourth portion being connected to the third portion and protruding outside the through hole.

In some embodiments, the fourth section has a radial dimension greater than the radial dimension of the third section.

In some embodiments, the first portion of each of the two through holes and the second wear-resistant body form the entire inner wall of the through hole.

In some embodiments, the material composition of the first wear body includes at least two of zirconia, alumina, and silicon carbide, and tungsten carbide, the material composition of the second wear body includes at least two of zirconia, alumina, and silicon carbide, and the material composition of the substrate includes cast steel.

In another aspect of the present disclosure, a method for producing a pharmaceutical composition comprising the steps of:
mixing tungsten carbide powder, iron powder and at least two of zirconia powder, alumina powder and silicon carbide powder to prepare a first wear body;
mixing at least two of zirconia powder, alumina powder and silicon carbide powder with iron powder to prepare a second wear body;
and placing a first wear body and two second wear bodies in a mold, pouring molten cast steel into the mold to form a substrate, and combining the substrate with the first wear body and the two second wear bodies to form a substrate.

In some embodiments, the particle sizes of the zirconia powder, alumina powder and silicon carbide powder range from 0.02 mm to 0.1 mm.

In some embodiments, the particle size of the tungsten carbide powder ranges from 5 μm to 10 μm.

In some embodiments, the mass ratio of the combination of at least two of the zirconia powder, alumina powder, and silicon carbide powder to the iron powder ranges from 1:1 to 3:1.

In some embodiments, the mass ratio of tungsten carbide powder to a combination of at least two of zirconia powder, alumina powder, and silicon carbide powder is less than 20%.

In some embodiments, tungsten carbide powder, iron powder, and at least two of zirconia powder, alumina powder, and silicon carbide powder are mixed and placed in a furnace and heated to 1350°C to 1480°C, the temperature is maintained for a first preset period after fully molten iron is obtained, and then cooled to obtain a first wear body.

In some embodiments, at least two of zirconia powder, alumina powder and silicon carbide powder are mixed with iron powder and placed in a furnace and heated to 1350°C to 1480°C, the temperature is maintained for a second preset period after fully molten iron is obtained, and then cooled to obtain a second wear body.

In some embodiments, the cast steel is heated to 1500°C to 1550°C to form the molten steel, and the molten steel is poured into a mold at 1480°C to 1520°C to form the substrate.

In another aspect of the present disclosure, a concrete pump truck is provided that includes a spectacle plate for a concrete pump truck.

Based on the above technical scheme, the present disclosure has at least the following beneficial effects:

In some embodiments, the surface of the ridge of the spectacle plate and the inner wall of the through hole connected to the ridge are the working surfaces where the spectacle plate cooperates with the cutting ring, and are more susceptible to wear, so that the surface of the ridge and the part of the inner wall of the through hole connected to the ridge are provided with a first wear body, and the other part of the inner wall of the through hole is provided with a second wear body. That is, wear bodies are added to the cutting surfaces where the spectacle plate cooperates with the cutting ring and to the material passage holes, thereby improving the wear resistance of the spectacle plate. In addition, a preset amount of tungsten is added to the wear body of the ridge to improve the wear resistance and impact resistance of the wear body.

The drawings described herein are used to provide further understanding of the present disclosure and constitute a part of this application. The exemplary embodiments of the present disclosure and the description thereof are used to explain the present disclosure and do not constitute undue limitations to the present disclosure.

FIG. 1 is a schematic diagram of a spectacle plate for a concrete pump truck according to some embodiments of the present disclosure. FIG. 2 is a schematic cross-sectional view taken along line A-A in FIG. 1 .

It should be understood that the dimensions of the various parts shown in the drawings are not drawn according to actual proportions. In addition, the same or similar reference numbers refer to the same or similar components.

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.
The description of the exemplary embodiments is merely illustrative and should not be construed as any limitation on the disclosure, its application or use. The disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. However, unless otherwise specified, the relative arrangement of parts and steps, composition of materials, formulas and numerical values described in these embodiments should be construed as illustrative only and not limiting.

Words such as "first" and "second" used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. Words such as "comprise" and "include" mean that the element before the word covers the elements listed after the word, and do not exclude the possibility of covering other elements. "Top", "bottom", "left" and "right" are only used to indicate relative positional relationships. If the absolute position of the described object changes, the relative positional relationships may change accordingly.

In this disclosure, when a particular device is described as being located between a first device and a second device, there may or may not be an intervening device between the particular device and the first device or the second device. When a particular device is described as being connected to another device, the particular device may be directly connected to the other device without an intervening device, or may not be directly connected to the other device but may have an intervening device.

All terms (including technical and scientific terms) used in this disclosure have the same meaning as would be understood by a person skilled in the art to which this disclosure belongs, unless otherwise defined. It should also be understood that terms defined in, for example, a general dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an ideal or very formal sense unless expressly defined as such herein.

Technologies, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but, where appropriate, they shall be considered part of this specification.

Spectacle plates, also known as wear plates, are an important part of concrete pumps. They are called spectacle plates because of their eyeglass-like shape.

In concrete pumping machines such as concrete pumps and pumping cars, the spectacle plate and cutting ring are important parts of the concrete pumping system. The cutting ring is connected to the S-shaped swing pipe. The S-shaped swing pipe and cutting ring driven by the swing cylinder swing from the concrete cylinder port on one side to the concrete cylinder port on the other side, and the spectacle plate is fixed to the concrete hopper, and its two through holes communicate with the concrete cylinder port on one side and the concrete cylinder port on the other side respectively. In this way, when the swing cylinder drives and moves the S-shaped swing pipe and cutting ring, the spectacle plate and cutting ring form a switching friction pair. The sudden swing of the S-shaped swing pipe and cutting ring generates friction between the spectacle plate and the concrete, and the spectacle plate also receives the impact force of the abrasive particles during switching. Therefore, the spectacle plate and cutting ring simultaneously receive impact force, shear force and friction force during operation.

For spectacle plates, the ridges 32 of the spectacle plate are usually the first to wear and fail due to abrasive impact and cutting wear. In some related art, the ridges 32 of the spectacle plate are reinforced with alloys, but are still the weak part of the spectacle plate.

Based on this, some embodiments of the present disclosure provide a spectacle plate for a concrete pump truck, a preparation method thereof, and a concrete pump truck to solve the problem that the spectacle plate is easily worn.

As shown in Figures 1 and 2, some embodiments provide a spectacle plate for a concrete pump truck that includes a substrate 3, a first wear-resistant body 1, and two second wear-resistant bodies 2.

The substrate 3 includes two through holes 31, a ridge portion 32, and two arc portions 33. The ridge portion 32 is provided between the two through holes 31, and the two arc portions 33 and the ridge portion 32 form the two through holes 31.

The first wear-resistant body 1 includes a plurality of first portions 11 and a second portion 12, and one of the plurality of first portions 11 is provided in each of the two through holes 31, the plurality of first portions 11 are connected to the ridge portion 32, and the second portion 12 is disposed on the surface of the ridge portion 32 and is located between the two through holes 31.

A second wear-resistant body 2 is provided in each of the two through holes 31, and the two second wear-resistant bodies 2 are connected to the two arc portions 33, respectively.

Here, the wear resistance of the first wear-resistant body 1 is greater than the wear resistance of the second wear-resistant body 2, which in turn is greater than the wear resistance of the substrate 3.

In the above-described embodiment, the wear part where the spectacle plate cooperates with the cutting ring is designed as a divided structure, i.e., a ridge portion 32 and two arc portions 33. The surface of the ridge portion 32 and the inner wall of the through hole 31 connected to the ridge portion 32 are the working surfaces where the spectacle plate cooperates with the cutting ring. The working surfaces include the cutting surface and the inner wall surface of the material passage hole. The surface of the ridge portion 32 is the cutting surface, and the inner wall surface of the through hole 31 is the inner wall surface of the material passage hole. The cutting surface and the material passage hole are more susceptible to wear. Therefore, the surface of the ridge portion 32 and the part of the inner wall of the through hole 31 connected to the ridge portion 32 are provided with a first wear-resistant body 1, and the inner side of the two arc portions 32, i.e., the other part of the inner wall of the through hole 31, are provided with a second wear-resistant body 2. The wear resistance of the first wear-resistant body 1 is greater than that of the second wear-resistant body 2, which in turn is greater than that of the substrate 3, so that the wear resistance of the ridge portion 32 of the spectacle plate can be improved and the service life of the spectacle plate can be extended.

As shown in FIG. 2, in some embodiments, the second wear-resistant body 2 includes a third portion 21 and a fourth portion 22, the third portion 21 being disposed within the through hole 31, and the fourth portion 22 being connected to the third portion 21 and protruding outside the through hole 31.

The two second wear-resistant bodies 2 cover the connection between the two through holes 31 and the arc portion 33, and the fourth portion 22 is connected to the third portion 21 and protrudes outside the through holes 31, i.e., in the direction of the cutting ring, to better protect the base material 3 of the spectacle plate from wear.

In some embodiments, the fourth portion 22 has a radial dimension greater than the radial dimension of the third portion 21.

The fourth portion 22 covers a portion of the surface of the arc portion 33 to improve the wear resistance of the arc portion 33.

In some embodiments, the first portion 11 and the second wear-resistant body 2 of each of the two through holes 31 form the entire inner wall of the through hole 31.

In each through hole 31, the first part 11 of the first wear-resistant body 1 is provided close to the ridge portion 32, and the second wear-resistant body 2 is provided away from the ridge portion 32, and the first part 11 and the second wear-resistant body 2 form the entire inner wall of the through hole 31 in order to improve the wear resistance of the inner wall of the entire through hole 31, and the first part 11 close to the ridge portion 32 is the first wear-resistant body 1, and the wear resistance of the first wear-resistant body 1 is greater than the wear resistance of the second wear-resistant body 2 in order to further improve the wear resistance of the ridge portion 32 of the spectacle plate.

In some embodiments, the material composition of the first wear body 1 includes at least two of zirconia, alumina, and silicon carbide and tungsten carbide, the material composition of the second wear body 2 includes at least two of zirconia, alumina, and silicon carbide, and the material composition of the substrate 3 includes cast steel.

Zirconia, alumina and silicon carbide are wear-resistant ceramic materials. The fact that at least two of the zirconia powder, alumina powder and silicon carbide powder are made into the second wear-resistant body 2 means that the second wear-resistant body 2 is made of a wear-resistant ceramic material and therefore has good wear resistance and impact resistance.

At least two of zirconia powder, alumina powder and silicon carbide powder and tungsten carbide powder are combined in the first wear body 1, and the addition of tungsten to the ceramic wear-resistant material further improves the wear resistance and impact resistance of the first wear body 1.

Some embodiments of the present disclosure include a method for producing a method comprising the steps of:
To prepare a first wear-resistant body 1, a step of mixing tungsten carbide powder, iron powder and at least two of zirconia powder, alumina powder and silicon carbide powder is performed;
To prepare the second wear-resistant body 2, a step of mixing at least two of zirconia powder, alumina powder and silicon carbide powder with iron powder is performed;
The present invention further provides a method for preparing the above-mentioned spectacle plate for a concrete pump truck, comprising the steps of: placing the first wear-resistant body 1 and the two second wear-resistant bodies 2 in a mold; pouring molten cast steel into the mold to form a substrate 3; and combining the substrate 3 with the first wear-resistant body 1 and the two second wear-resistant bodies 2 to form a spectacle plate.

The spectacle plate in the embodiment of the present disclosure is formed by one-piece vacuum casting.

The surface of the ridge portion 32 and the inner wall of the through hole 31 connected to the ridge portion 32 are the working surfaces on which the spectacle plate cooperates with the cutting ring. The surface of the ridge portion 32 is the cutting surface, and the through hole 31 is the material passage hole. The cutting surface and the material passage hole are more prone to wear. Therefore, the surface of the ridge portion 32 and the part of the inner wall of the through hole 31 connected to the ridge portion 32 are provided with a first wear body 1, and the other part of the inner wall of the through hole 31 is provided with a second wear body 2. That is, the ceramic wear body is added to the cutting surface and the material passage hole on which the spectacle plate cooperates with the cutting ring. The ceramic wear body and the substrate are cast and molded integrally, so that a strong bond is realized and the problem of the alloy or wear-resistant layer falling off caused by brazing, joining and other processes is solved. Spectacle plates only undergo normal wear and failure during use, avoiding the problem of 20% premature failure caused by alloy blocks falling off or bouncing off and other reasons.

To solve the problem of low wear resistance of the ridge portion 32 of the spectacle plate, a certain amount of tungsten is added to the wear-resistant material of the ridge portion 32 to further improve the wear resistance and impact resistance of the wear body.

In the embodiment of the present disclosure, the spectacle plate is formed by integral vacuum casting, which does not require processing procedures such as crude steel blanking, surfacing, alloy groove cutting, alloy formwork preparation, brazing, and alloy surface polishing, and has the advantages of easy processing, high production efficiency, and low overall cost. Compared with the traditional cemented carbide inlay process, the efficiency can be increased by 1.5 times.

The wear-resistant body of the spectacle plate is a ceramic wear-resistant body, and the cost of the ceramic wear-resistant body only accounts for 40% of the price of the entire spectacle plate, so the overall cost is greatly reduced and high cost performance is achieved, thus allowing users to have more choices.

In some embodiments, the particle sizes of the zirconia powder, alumina powder and silicon carbide powder range from 0.02 mm to 0.1 mm.

The ceramic wear-resistant body is located in the main working part of the spectacle plate. The ceramic wear-resistant body is formed by high-temperature casting. Due to the large size of the powder (0.02-0.1 mm), if there are defects such as inclusions and air holes in the forming process, they can be effectively filled by high-temperature infiltration in the secondary substrate casting process, so that the working surface of the spectacle plate can meet the application requirements after subsequent grinding.

In some embodiments, the particle size of the tungsten carbide powder ranges from 5 μm to 10 μm.

In some embodiments, the mass ratio of the combination of at least two of the zirconia powder, alumina powder, and silicon carbide powder to the iron powder ranges from 1:1 to 3:1.

In some embodiments, the mass ratio of tungsten carbide powder to a combination of at least two of zirconia powder, alumina powder, and silicon carbide powder is less than 20%.

In some embodiments, tungsten carbide powder, iron powder and at least two of zirconia powder, alumina powder and silicon carbide powder are mixed and placed in a furnace and heated to 1350°C to 1480°C, the temperature is maintained for a first preset period after fully molten iron is obtained, and then cooled to obtain the first wear body 1.

In some embodiments, at least two of zirconia powder, alumina powder and silicon carbide powder are mixed with iron powder and placed in a furnace, heated to 1350°C to 1480°C, the temperature is maintained for a second preset period after fully molten iron is obtained, and then cooled to obtain the second wear body 2.

In some embodiments, the cast steel is heated to 1500°C to 1550°C to form the molten cast steel, and the molten cast steel is poured into a mold at 1480°C to 1520°C to form the substrate 3.

In some embodiments, the method for preparing a spectacle plate for a concrete pump truck mainly includes the following steps:

Step 1: The wear-resistant body is prefabricated. Two or more of zirconia powder, alumina powder and silicon carbide powder, which are all wear-resistant ceramic powders, are mixed, and the particle size of the wear-resistant ceramic powder is 0.02 mm to 0.1 mm. Tungsten carbide powder (the particle size of the tungsten carbide powder is 5 μm to 10 μm) is added to the wear-resistant ceramic powder and then mixed with iron powder. Here, the mass ratio of the wear-resistant ceramic powder to the iron powder is (1 to 3): 1, and the mass ratio of the tungsten carbide powder to the wear-resistant ceramic powder is less than 20%. The mixed wear-resistant material is placed in a furnace and heated to 1350 ° C to 1480 ° C, and the temperature is maintained for 20 minutes after completely molten iron is obtained. Then, cooling is performed to obtain the first wear-resistant body 1.

Two or more of zirconia powder, alumina powder and silicon carbide powder, all of which are wear-resistant ceramic powders, are used, with the particle size of the powder being 0.02 mm to 0.1 mm. The wear-resistant ceramic powder is mixed with iron powder, with the mass ratio of the wear-resistant ceramic powder to the iron powder being (1 to 3):1. The mixed wear-resistant materials are placed in a furnace and heated to 1350°C to 1480°C, and the temperature is maintained for 20 minutes after completely molten iron is obtained. Then, cooling is performed to obtain the second wear-resistant body 2.

Step 2: Casting is carried out. Melting is carried out in a 1 ton medium frequency furnace, and cast steel melt is used as the casting melt. The temperature is increased to 1500°C-1550°C. Once the complete melt is obtained, pouring is carried out at a pouring temperature of 1480°C-1520°C to form the substrate 3 of the spectacle plate, which is metallurgically bonded with the previously prepared first wear-resistant body 1 and two second wear-resistant bodies 2.

Step 3: Sand removal and cooling are performed. Sand removal and casting mold cleaning are performed. After natural cooling, a ceramic wear-resistant spectacle plate blank is obtained, which is machined as necessary to obtain a spectacle plate part.

In the spectacle plate in the above embodiment, the base material 3 is formed by pouring molten cast steel, a first wear-resistant body 1 is provided on the surface of the ridge portion 32 and the portion where the through hole 31 is adjacent to the ridge portion 32, and two second wear-resistant bodies 2 are provided on the portion where the through hole 31 is adjacent to the arc portion 33. In each through hole 31, the first part 11 of the first wear-resistant body 1 is provided in a position close to the ridge portion 32, and the second wear-resistant body 2 is provided in a position away from the ridge portion 32, and the first part 11 and the second wear-resistant body 2 form the entire inner wall of the through hole 31. The second wear-resistant body 2 is a wear-resistant body obtained after the wear-resistant ceramic powder is mixed with the iron powder, and the first wear-resistant body 1 is a wear-resistant body provided on the ridge portion 32 containing tungsten carbide powder. Here, the particle size of the tungsten carbide powder is 5 μm to 10 μm.

In an embodiment of the present disclosure, a preset amount of tungsten carbide is added to the wear-resistant body located on the ridge portion 32 of the spectacle plate, thereby increasing the wear resistance of the weak ridge portion 32 of the spectacle plate.

The ceramic wear body of the spectacle plate component prepared according to embodiments of the present disclosure may have a hardness of greater than 88 HRA, a wear rate of less than 0.025%, a flexural strength of greater than 2400 MPa, and an impact toughness of greater than 5 J/ ^cm2 .

EMBODIMENT 1
Step 11: The wear-resistant body was prefabricated. Zirconia powder and alumina powder, both of which were wear-resistant ceramic powders and had a particle size of 0.02 mm, were mixed. Tungsten carbide powder (the particle size of the tungsten carbide powder was 5 μm) was added to the wear-resistant ceramic powder, and then mixed with iron powder. Here, the mass ratio of the wear-resistant ceramic powder to the iron powder was 3:1, and the mass ratio of the tungsten carbide powder to the wear-resistant ceramic powder was less than 20%. The mixed wear-resistant material was placed in a furnace and heated to 1350°C-1480°C, and the temperature was maintained for 20 minutes after completely molten iron was obtained. Then, cooling was performed to obtain the first wear-resistant body 1.

Zirconia powder and alumina powder, both of which are wear-resistant ceramic powders and have a particle size of 0.02 mm, were used. The wear-resistant ceramic powder was mixed with iron powder, and the mass ratio of the wear-resistant ceramic powder to the iron powder was 3:1. The mixed wear-resistant materials were placed in a furnace and heated to 1350°C to 1480°C, and the temperature was maintained for 20 minutes after completely molten iron was obtained. Then, cooling was performed to obtain the second wear-resistant body 2.

Step 12: Casting was carried out. Melting was carried out in a 1 ton intermediate frequency furnace, and cast steel melt was used as the casting melt. The temperature was increased to 1500°C-1550°C. Once the complete melt was obtained, pouring was carried out at a pouring temperature of 1480°C-1520°C to form the substrate 3 of the spectacle plate, which was metallurgically bonded with the previously prepared first wear-resistant body 1 and two second wear-resistant bodies 2.

Step 13: Sand removal and cooling were performed. Sand removal and casting mold cleaning were performed. After natural cooling, a ceramic wear-resistant spectacle plate blank was obtained, which was machined as necessary to obtain a spectacle plate part.

In the spectacle plate in the first embodiment, the base material 3 was formed by pouring molten cast steel, and a first wear-resistant body 1 was provided on the surface of the ridge portion 32 and on the portion where the through hole 31 is adjacent to the ridge portion 32, and two second wear-resistant bodies 2 were provided on the portion where the through hole 31 is adjacent to the arc portion 33. In each through hole 31, the first part 11 of the first wear-resistant body 1 was provided in a position close to the ridge portion 32, and the second wear-resistant body 2 was provided in a position away from the ridge portion 32, and the first part 11 and the second wear-resistant body 2 formed the entire inner wall of the through hole 31. The second wear-resistant body 2 was a wear-resistant body obtained after the wear-resistant ceramic powder was mixed with the iron powder, and the first wear-resistant body 1 was a wear-resistant body provided on the ridge portion 32 containing tungsten carbide powder. Here, the particle size of the tungsten carbide powder was 5 μm.

In the first embodiment, a preset amount of tungsten carbide is added to the wear-resistant body located in the ridge portion 32 of the spectacle plate, thereby increasing the wear resistance of the weak ridge portion 32 of the spectacle plate.

The hardness of the ceramic wear-resistant body of the spectacle plate component prepared according to embodiment 1 can reach more than 89 HRA, the wear rate is less than 0.024%, the bending strength is 3100 MPa, and the impact toughness is more than 6.2 J/ ^cm2 .

EMBODIMENT 2
Step 21: The wear-resistant body was prefabricated. Zirconia powder, alumina powder and silicon carbide powder, all of which were wear-resistant ceramic powders and had a particle size of 0.1 mm, were used. Tungsten carbide powder (the particle size of the tungsten carbide powder was 10 μm) was added to the wear-resistant ceramic powder and then mixed with iron powder. Here, the mass ratio of the wear-resistant ceramic powder to the iron powder was 1:1, and the mass ratio of the tungsten carbide powder to the wear-resistant ceramic powder was less than 20%. The mixed wear-resistant materials were placed in a furnace and heated to 1350°C-1480°C, and the temperature was maintained for 20 minutes after completely molten iron was obtained. Then, cooling was performed to obtain the first wear-resistant body 1.

Zirconia powder, alumina powder and silicon carbide powder, all of which are wear-resistant ceramic powders and have a particle size of 0.1 mm, were used. The wear-resistant ceramic powder was mixed with iron powder, and the mass ratio of the wear-resistant ceramic powder to the iron powder was 1:1. The mixed wear-resistant materials were placed in a furnace and heated to 1350°C to 1480°C, and the temperature was maintained for 20 minutes after completely molten iron was obtained. Then, cooling was performed to obtain the second wear-resistant body 2.

Step 22: Casting was carried out. Melting was carried out in a 1 ton intermediate frequency furnace, and cast steel melt was used as the casting melt. The temperature was increased to 1500°C-1550°C. Once the complete melt was obtained, pouring was carried out at a pouring temperature of 1480°C-1520°C to form the substrate 3 of the spectacle plate, which was metallurgically bonded with the previously prepared first wear-resistant body 1 and two second wear-resistant bodies 2.

Step 23: Sand removal and cooling were performed. Sand removal and casting mold cleaning were performed. After natural cooling, a ceramic wear-resistant spectacle plate blank was obtained, which was machined as necessary to obtain a spectacle plate part.

In the spectacle plate in the second embodiment, the base material 3 was formed by pouring molten cast steel, and a first wear-resistant body 1 was provided on the surface of the ridge portion 32 and on the portion where the through hole 31 is adjacent to the ridge portion 32, and two second wear-resistant bodies 1 were provided on the portion where the through hole 31 is adjacent to the arc portion 33. In each through hole 31, the first part 11 of the first wear-resistant body 1 was provided in a position close to the ridge portion 32, and the second wear-resistant body 2 was provided in a position away from the ridge portion 32, and the first part 11 and the second wear-resistant body 2 formed the entire inner wall of the through hole 31. The second wear-resistant body 2 was a wear-resistant body obtained after the wear-resistant ceramic powder was mixed with the iron powder, and the first wear-resistant body 1 was a wear-resistant body provided on the ridge portion 32 containing tungsten carbide powder. Here, the particle size of the tungsten carbide powder was 10 μm.

In embodiment 2, a preset amount of tungsten carbide is added to the wear-resistant body located in the ridge portion 32 of the spectacle plate, thereby increasing the wear resistance and impact resistance of the vulnerable ridge portion 32 of the spectacle plate.

The hardness of the ceramic wear-resistant body of the spectacle plate component prepared according to embodiment 2 can reach more than 88 HRA, the wear rate is less than 0.020%, the bending strength is 2412 MPa, and the impact toughness is more than 5.2 J/ ^cm2 .

EMBODIMENT 3
Step 31: The wear-resistant body was prefabricated. Zirconia powder, alumina powder and silicon carbide powder, all of which were wear-resistant ceramic powders and had a particle size of 0.08 mm, were used. Tungsten carbide powder (the particle size of the tungsten carbide powder was 7 μm) was added to the wear-resistant ceramic powder and then mixed with iron powder. Here, the mass ratio of the wear-resistant ceramic powder to the iron powder was 2:1, and the mass ratio of the tungsten carbide powder to the wear-resistant ceramic powder was less than 20%. The mixed wear-resistant materials were placed in a furnace and heated to 1350°C-1480°C, and the temperature was maintained for 20 minutes after completely molten iron was obtained. Then, cooling was performed to obtain the first wear-resistant body 1.

Zirconia powder, alumina powder and silicon carbide powder, all of which are wear-resistant ceramic powders and have a particle size of 0.08 mm, were used. The wear-resistant ceramic powder was mixed with iron powder, and the mass ratio of the wear-resistant ceramic powder to the iron powder was 2:1. The mixed wear-resistant materials were placed in a furnace and heated to 1350°C to 1480°C, and the temperature was maintained for 20 minutes after completely molten iron was obtained. Then, cooling was performed to obtain the second wear-resistant body 2.

Step 32: Casting was carried out. Melting was carried out in a 1 ton intermediate frequency furnace, and cast steel melt was used as the casting melt. The temperature was increased to 1500°C-1550°C. Once the complete melt was obtained, pouring was carried out at a pouring temperature of 1480°C-1520°C to form the substrate 3 of the spectacle plate, which was metallurgically bonded with the previously prepared first wear-resistant body 1 and two second wear-resistant bodies 2.

Step 33: Sand removal and cooling were performed. Sand removal and casting mold cleaning were performed. After natural cooling, a ceramic wear-resistant spectacle plate blank was obtained, and machining was performed as necessary to obtain spectacle plate parts.

In the spectacle plate in the third embodiment, the base material 3 was formed by pouring molten cast steel, and a first wear-resistant body 1 was provided on the surface of the ridge portion 32 and on the portion where the through hole 31 is adjacent to the ridge portion 32, and two second wear-resistant bodies 2 were provided on the portion where the through hole 31 is adjacent to the arc portion 33. In each through hole 31, the first part 11 of the first wear-resistant body 1 was provided in a position close to the ridge portion 32, and the second wear-resistant body 2 was provided in a position away from the ridge portion 32, and the first part 11 and the second wear-resistant body 2 formed the entire inner wall of the through hole 31. The second wear-resistant body 2 was a wear-resistant body obtained after the wear-resistant ceramic powder was mixed with the iron powder, and the first wear-resistant body 1 was a wear-resistant body provided on the ridge portion 32 containing tungsten carbide powder. Here, the particle size of the tungsten carbide powder was 7 μm.

In embodiment 3, a preset amount of tungsten carbide is added to the wear-resistant body located in the ridge portion 32 of the spectacle plate, thereby increasing the wear resistance and impact resistance of the vulnerable ridge portion 32 of the spectacle plate.

The hardness of the ceramic wear-resistant body of the spectacle plate component prepared according to embodiment 3 can reach more than 89 HRA, the wear rate is less than 0.023%, the bending strength is 2642 MPa, and the impact toughness is more than 5.1 J/ ^cm2 .

EMBODIMENT 4
Step 41: The wear-resistant body was prefabricated. Zirconia powder and alumina powder, both of which were wear-resistant ceramic powders and had a particle size of 0.02 mm, were mixed together. Tungsten carbide powder (the particle size of the tungsten carbide powder was 5 μm) was added to the wear-resistant ceramic powder, and then mixed with iron powder. Here, the mass ratio of the wear-resistant ceramic powder to the iron powder was 2:1, and the mass ratio of the tungsten carbide powder to the wear-resistant ceramic powder was less than 20%. The mixed wear-resistant material was placed in a furnace and heated to 1350°C-1480°C, and the temperature was maintained for 20 minutes after completely molten iron was obtained. Then, cooling was performed to obtain the first wear-resistant body 1.

Zirconia powder and alumina powder, both of which are wear-resistant ceramic powders and have a particle size of 0.02 mm, were mixed. The wear-resistant ceramic powder was mixed with iron powder, and the mass ratio of the wear-resistant ceramic powder to the iron powder was 2:1. The mixed wear-resistant materials were placed in a furnace and heated to 1350°C to 1480°C, and the temperature was maintained for 20 minutes after completely molten iron was obtained. Cooling was then performed to obtain the second wear-resistant body 2.

Step 42: Casting was carried out. Melting was carried out in a 1 ton intermediate frequency furnace, and cast steel melt was used as the casting melt. The temperature was increased to 1500°C-1550°C. Once the complete melt was obtained, pouring was carried out at a pouring temperature of 1480°C-1520°C to form the substrate 3 of the spectacle plate, which was metallurgically bonded with the previously prepared first wear-resistant body 1 and two second wear-resistant bodies 2.

Step 43: Sand removal and cooling were performed. Sand removal and casting mold cleaning were performed. After natural cooling, a ceramic wear-resistant spectacle plate blank was obtained, which was machined as necessary to obtain a spectacle plate part.

In the spectacle plate in the fourth embodiment, the base material 3 was formed by pouring molten cast steel, and a first wear-resistant body 1 was provided on the surface of the ridge portion 32 and on the portion where the through hole 31 is adjacent to the ridge portion 32, and two second wear-resistant bodies 2 were provided on the portion where the through hole 31 is adjacent to the arc portion 33. In each through hole 31, the first part 11 of the first wear-resistant body 1 was provided in a position close to the ridge portion 32, and the second wear-resistant body 2 was provided in a position away from the ridge portion 32, and the first part 11 and the second wear-resistant body 2 formed the entire inner wall of the through hole 31. The second wear-resistant body 2 was a wear-resistant body obtained after the wear-resistant ceramic powder was mixed with the iron powder, and the first wear-resistant body 1 was a wear-resistant body provided on the ridge portion 32 containing tungsten carbide powder. Here, the particle size of the tungsten carbide powder was 5 μm.

In embodiment 4, a preset amount of tungsten carbide is added to the wear-resistant body located in the ridge portion 32 of the spectacle plate, thereby increasing the wear resistance of the weak ridge portion 32 of the spectacle plate.

The hardness of the ceramic wear-resistant body of the spectacle plate component prepared according to embodiment 4 can reach more than 88HRA, the wear rate is more than 0.087%, the bending strength is 3300MPa, and the impact toughness is more than 9.0J/ ^cm2 .

EMBODIMENT 5
Step 51: The wear-resistant body was prefabricated. Zirconia powder and alumina powder, both of which were wear-resistant ceramic powders and had a particle size of 0.08 mm, were mixed. Tungsten carbide powder (the particle size of the tungsten carbide powder was 5 μm) was added to the wear-resistant ceramic powder, and then mixed with iron powder. Here, the mass ratio of the wear-resistant ceramic powder to the iron powder was 3:1, and the mass ratio of the tungsten carbide powder to the wear-resistant ceramic powder was less than 20%. The mixed wear-resistant material was placed in a furnace and heated to 1300°C-1390°C, and the temperature was maintained for 20 minutes after completely molten iron was obtained. Then, cooling was performed to obtain a second wear-resistant body 2.

Zirconia powder and alumina powder, both of which are wear-resistant ceramic powders and have a particle size of 0.08 mm, were mixed. The wear-resistant ceramic powder was mixed with iron powder, and the mass ratio of the wear-resistant ceramic powder to the iron powder was 3:1. The mixed wear-resistant materials were placed in a furnace and heated to 1300°C to 1390°C, and the temperature was maintained for 20 minutes after completely molten iron was obtained. Cooling was then performed to obtain the second wear-resistant body 2.

Step 52: Casting was carried out. Melting was carried out in a 1 ton intermediate frequency furnace, and cast steel melt was used as the casting melt. The temperature was increased to 1500°C-1550°C. Once the complete melt was obtained, pouring was carried out at a pouring temperature of 1480°C-1520°C to form the substrate 3 of the spectacle plate, which was metallurgically bonded with the previously prepared first wear-resistant body 1 and two second wear-resistant bodies 2.

Step 53: Sand removal and cooling were performed. Sand removal and casting mold cleaning were performed. After natural cooling, a ceramic wear-resistant spectacle plate blank was obtained, which was machined as necessary to obtain a spectacle plate part.

In the spectacle plate in the fifth embodiment, the base material 3 was formed by pouring molten cast steel, and a first wear-resistant body 1 was provided on the surface of the ridge portion 32 and on the portion where the through hole 31 is adjacent to the ridge portion 32, and two second wear-resistant bodies 2 were provided on the portion where the through hole 31 is adjacent to the arc portion 33. In each through hole 31, the first part 11 of the first wear-resistant body 1 was provided in a position close to the ridge portion 32, and the second wear-resistant body 2 was provided in a position away from the ridge portion 32, and the first part 11 and the second wear-resistant body 2 formed the entire inner wall of the through hole 31. The second wear-resistant body 2 was a wear-resistant body obtained after the wear-resistant ceramic powder was mixed with the iron powder, and the first wear-resistant body 1 was a wear-resistant body provided on the ridge portion 32 containing tungsten carbide powder. Here, the particle size of the tungsten carbide powder was 5 μm.

In embodiment 5, a preset amount of tungsten carbide is added to the wear-resistant body located in the ridge portion 32 of the spectacle plate, thereby increasing the wear resistance of the weak ridge portion 32 of the spectacle plate.

The hardness of the ceramic wear-resistant body of the spectacle plate component prepared according to embodiment 5 can reach more than 81 HRA, the wear rate is more than 0.109%, the bending strength is 1630 MPa, and the impact toughness is less than 4.2 J/ ^cm2 .

Based on the above embodiments, the present disclosure has at least the following beneficial effects:
(1) The spectacle plate has a simple structure and a simple production process, which makes it easy to process and low cost.
(2) The powder of the ceramic wear-resistant body of the spectacle plate is rigorously screened and mixed, thereby solving the problem of powder shedding and peeling of the wear-resistant layer caused by uneven mixing.
(3) Tungsten carbide is added to the ridges 32, which are weak points of the spectacle plate, to increase wear resistance.
(4) The substrate of the spectacle plate and the ceramic wear-resistant body are metallurgically bonded, and the copper brazing and wear-resistant surfacing processes are omitted, so there are no weak working parts.
(5) The substrate and the wear-resistant body of the spectacle plate are integrally bonded together by high-temperature casting, which enhances the wear resistance of the working surface of the spectacle plate.
(6) The spectacle plate is integrally formed, but the working surface and non-working surface are made of different materials, which not only ensures the wear resistance of the working surface, but also ensures the machinability, installation and fixing of the base material.

Some embodiments of the present disclosure further provide a concrete pump truck that includes a spectacle plate for a concrete pump truck.

The entire spectacle plate is formed by high-temperature casting and made of carbon steel material. The wear-resistant body is bonded with the base material by high-temperature casting, and the working surface is made of ceramic wear-resistant body, which ensures the wear resistance of the spectacle plate during working. In addition, the toughness and machinability of the base material are also guaranteed.

Based on the above-described embodiments of the present disclosure, technical features of one embodiment may be beneficially combined with one or more other embodiments, unless expressly denied.

Although some specific embodiments of the present disclosure have been described in detail by examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments may be modified or some technical features may be substituted with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the claims.

Claims (13)

A substrate (3) having two through holes (31) and a divided structure having a ridge portion (32) and two arc portions (33), the ridge portion (32) being provided between the two through holes (31), one of the two arc portions (33) being adjacent to one of the two through holes (31), the other of the two arc portions (33) being adjacent to the other of the two through holes (31) , the two arc portions (33) and the ridge portion (32) forming the two through holes (31);
A first wear-resistant body (1) having a plurality of first portions (11) and a single second portion (12) ; and two second wear-resistant bodies (2),
The part (11) and the second wear-resistant body (2) form the entire inner walls of the two through holes (31),
a portion of an inner wall of each of the two through holes (31) is formed by one of the plurality of first portions (11), the plurality of first portions (11) are connected to an inner wall of the ridge portion (32), and the second portion (12) is disposed on a surface of the ridge portion (32) and is located between the two through holes (31);
The remaining portions of the inner walls of the two through holes (31) are formed by one of the two second wear-resistant bodies (2), and the two second wear-resistant bodies (2) are connected to the two arc portions (33), respectively;
The wear resistance of the first wear-resistant body (1) is greater than the wear resistance of the second wear-resistant body (2), and the wear resistance of the second wear-resistant body (2) is greater than the wear resistance of the substrate (3).
Spectacle plate for concrete pump truck. The spectacle plate for a concrete pump truck as described in claim 1, wherein the second wear-resistant body (2) has a third portion (21) and a fourth portion (22), the third portion (21) is arranged within the through hole (31), the third portion (21) is connected to the inner wall of the arc portion (33), and the fourth portion (22) is connected to the third portion (21) and protrudes outside the through hole (31). The spectacle plate for a concrete pump vehicle according to claim 2, wherein the fourth portion (22) has a radial dimension greater than the radial dimension of the third portion (21). The spectacle plate for a concrete pump vehicle according to any one of claims 1 to 3, wherein the material composition of the first wear-resistant body (1) includes at least two of zirconia, alumina and silicon carbide and tungsten carbide, the material composition of the second wear-resistant body (2) includes at least two of zirconia, alumina and silicon carbide, and the material composition of the base material (3) includes cast steel. To prepare the first wear-resistant body (1), a tungsten carbide powder, an iron powder and at least two of a zirconia powder, an alumina powder and a silicon carbide powder are mixed;
To prepare the second wear-resistant body (2), mixing at least two of zirconia powder, alumina powder and silicon carbide powder with iron powder;
and b. placing the first wear-resistant body (1) and the two second wear-resistant bodies (2) in a mold, pouring molten cast steel into the mold to form the base material (3), and combining the base material (3) with the first wear-resistant body (1) and the two second wear-resistant bodies (2) to form the spectacle plate. The method for preparing a spectacle plate for a concrete pump vehicle according to claim 5, wherein the particle sizes of the zirconia powder, the alumina powder and the silicon carbide powder are in the range of 0.02 mm to 0.1 mm. The method for preparing a spectacle plate for a concrete pump vehicle according to claim 5 or 6, wherein the particle size of the tungsten carbide powder is in the range of 5 μm to 10 μm. The method for preparing a spectacle plate for a concrete pump vehicle according to any one of claims 5 to 7, wherein the mass ratio of the combination of at least two of the zirconia powder, the alumina powder and the silicon carbide to the iron powder is in the range of 1:1 to 3:1. The method for preparing a spectacle plate for a concrete pump vehicle according to any one of claims 5 to 8, wherein the mass ratio of the tungsten carbide powder to the combination of at least two of the zirconia powder, the alumina powder, and the silicon carbide powder is less than 20%. The method for preparing a spectacle plate for a concrete pump vehicle according to any one of claims 5 to 9, wherein the tungsten carbide powder, the iron powder, and at least two of the zirconia powder, the alumina powder, and the silicon carbide powder are mixed and placed in a furnace, heated to 1350°C to 1480°C, the temperature is maintained for a first preset period after completely molten iron is obtained, and then cooling is performed to obtain the first wear-resistant body (1). The method for preparing a spectacle plate for a concrete pump truck according to any one of claims 5 to 10, wherein the iron powder and at least two of the zirconia powder, the alumina powder and the silicon carbide powder are mixed and placed in a furnace, heated to 1350°C to 1480°C, the temperature is maintained for a second preset period after completely molten iron is obtained, and then cooled to obtain the second wear-resistant body (2). The method for preparing a spectacle plate for a concrete pump vehicle according to any one of claims 5 to 11, wherein cast steel is heated to 1500°C to 1550°C to form the molten cast steel, and the molten cast steel is poured into the mold at 1480°C to 1520°C to form the base material (3). A concrete pump vehicle equipped with a spectacle plate for a concrete pump vehicle according to any one of claims 1 to 4.

Images