JP3960715B2 - Squeezing concrete pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a squeeze-type concrete pump using a tapered pumping tube whose outer diameter is substantially equal and whose inner diameter gradually decreases toward the discharge side, and particularly relates to support of a rotor rotating in a casing.
[0002]
[Prior art]
Generally, a squeeze-type concrete pump is equipped with an elastic pumping tube in a horizontal U-shape in a cylindrical casing, and rolls while pressing the roller supported by the rotor along the pumping tube. The pressing action and the restoring action of the pumping tube itself give a pumping action to the pumping tube to pump the ready-mixed concrete sucked into the pumping tube.
[0003]
However, when the roller begins to release the pressure of the pumping tube on the discharge side of the pumping tube and the inside of the pumping tube begins to open, the pressure difference between the front and rear of the roller (the front side is higher than the rear side of the roller) Ready-mixed concrete flows backward due to high pressure due to long-distance placement. For this reason, the inner surface of the pumping tube is particularly severely worn at the position where the roller releases the pressure of the pumping tube, causing the life of the pumping tube to be shortened.
[0004]
Therefore, in order to reduce the back flow of the ready-mixed concrete as much as possible and to prolong the life of the pumping tube, as disclosed in Japanese Patent Application Laid-Open No. 59-3189, the pumping tube is made to the suction side opening area. It is considered that the opening area on the discharge side is tapered so as to extend over substantially the entire length. According to this tapered pumping tube, the sealed chamber in the pumping tube that is temporarily confined by the upper and lower rollers is gradually pressurized with a slight difference in the area of the front and rear in the pumping tube due to slight movement of the rollers. Therefore, even if the pressing of the pumping tube is released, the back flow of the ready-mixed concrete can be reduced.
[0005]
[Problems to be solved by the invention]
However, in the above structure, the thickness of the pressing start position and the pressing release position of the pumping tube by the roller is remarkably different, so the center of the rotor is eccentric with respect to the center of the casing. For this reason, a hole for mounting the rotor support member must be drilled at a position slightly eccentric from the center of the casing, which is a large part. In addition, there are various problems such as the need for a special jig and a large jig that is suitable for the casing.
Therefore, an object of the present invention is to provide a squeeze-type concrete pump that can eliminate the difficulty of processing the casing and can eliminate the need for a special jig.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the squeezing-type concrete pump of the present invention is provided such that a rotor having a roller is rotatably provided in a cylindrical casing so that the outer diameter is substantially equal and the inner diameter gradually decreases toward the discharge side. A pumping tube having a tapered shape is provided along the inner wall of the casing, the center of the rotor is eccentric from the center of the casing, and the pumping action is given by the pressing action of the pumping tube by the roller and the restoring action of the pumping tube itself. In the squeeze-type concrete pump that sucks ready-mixed concrete into the pumping tube and pumps the sucked ready-mixed concrete, a pair of support members that support the rotor is attached to the casing, and at least one support member of the pair of support members The casing of the center To match the attachment to the casing, the at least one of the support members, to form a hole at a position eccentric from the center of the casing, said rotor mounted in a state of being matched center of the rotor to the center of the hole (Claim 1).
According to the squeezed concrete pump having the above-described configuration, since at least one supporting member is attached to the casing so as to coincide with the center of the casing, the processing of the casing itself necessary for attaching the supporting member is performed on the casing. This can be done on the basis of the center.
[0007]
Further, the squeezed concrete pump of the present invention is provided with a rotor having a roller in a cylindrical casing so as to be rotatable, and is tapered so that the outer diameter is substantially equal and the inner diameter gradually decreases toward the discharge side. A pumping tube is provided along the inner wall of the casing, the center of the rotor is decentered from the center of the casing, and a pumping action is provided by the pressing action of the pumping tube by the roller and the restoring action of the pumping tube itself to generate the pumping tube. In the squeeze-type concrete pump that sucks in concrete and pumps the sucked ready-mixed concrete, a pair of support members that support the rotor is attached to the casing, and at least one of the pair of support members includes a main support member and an auxiliary A main support. Wood is to match the center of the casing with attached to the casing, a hole is formed at a position eccentric from the center of the casing, the auxiliary supporting member, the hole of the main support member center and of the rotor wherein the to match the center supports to the rotor is eccentric to the casing center by Rukoto attached to the main support member (claim 2).
According to the squeeze-type concrete pump having the above configuration, the main support member is attached to the casing so as to coincide with the center of the casing, and the auxiliary support member is attached to the main support member so as to coincide with the center of the rotor. Can be supported eccentrically with respect to the center of the casing. For this reason, the processing to the casing itself necessary for attaching the support member can be performed on the basis of the center of the casing.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view showing a squeezed concrete pump of the present invention, and FIG. 3 is a cross-sectional view taken along line A-O-A in FIG.
The squeeze-type concrete pump 1 that pumps ready-mixed concrete is inserted into a cylindrical casing 2 in a horizontal U-shape with an elastic pumping tube 3 as shown in FIG. It protrudes from the opening 4. The casing 2 has a lid-like main casing 5 and a lid-like sub-casing 6 which are joined together by bolts 7.
[0009]
As shown in FIG. 2, the pumping tube 3 has an outer diameter D that is substantially the same over the entire length, and an inner diameter that gradually decreases from the suction side toward the discharge side. That is, the opening area of the inner diameter D2 on the discharge side is smaller than the opening area of the inner diameter D1 on the suction side.
[0010]
A rotor 10 in which a pair of left and right rotor plates 8 are integrated by a cylindrical body 9 is provided in the center of the casing 2, and the rotor plate 8 on one side has a reduction gear 12 integrated with a hydraulic motor 11. A part of the rotor plate 8 is bolted concentrically with the center X of the rotor plate 8, and the rotating shaft 13 is fixed to the other rotor plate 8 concentrically with the center X of the rotor plate 8. A part of the hydraulic motor 11 is supported by an annular right support member 15 attached to the sub casing 6, and the rotating shaft 13 is a short cylindrical left support member 16 fixed to the main casing 5. A bearing J is rotatably supported.
[0011]
Two rollers 17 are pivotally supported at the end of the rotor 10 with a phase shifted by 180 degrees. When the rotor 10 rotates in the clockwise direction (the arrow Z direction in FIG. 2), the roller 17 starts to press the pumping tube 3 from the 6 o'clock position in FIG. 1 and continues along the pumping tube 3 as it is. It rolls, releases the pressure at the 12 o'clock position of the watch, and moves away from the pumping tube 3. Thereby, the ready-mixed concrete sucked from the lower end of the pumping tube 3 by the restoring force of the pumping tube 3 itself is pumped from the upper end of the pumping tube 3. At the 12 o'clock position, the thickness of the pumping tube 3 is somewhat compressed, so the roller 17 moves slightly forward from the 12 o'clock position before the sealed chamber in the pumping tube 3. 18 begins to open.
[0012]
Since the thickness of the pumping tube 3 increases toward the discharge side, the center X of the rotor 10 is decentered downward by ΔH with respect to the center Y of the casing 2 (FIG. 1). (See FIG. 3). For this reason, the left support member 16 is welded or bolted to the main casing 5 so as to be concentric with the center X of the rotor 10.
[0013]
A through hole 6a is formed concentrically with the center Y at the center of the sub casing 6, and a ring R having a concentric inner and outer periphery is fitted into the through hole 6a. It is welded to the sub casing 6.
The right support member 15 is attached to the ring R with a bolt 14 in a state in which the right support member 15 is fitted in a mounting hole 21 concentric with the center Y of the sub casing 6 constituted by the inner periphery of the ring R. Thus, the support member 15 is provided concentrically with the center Y of the sub casing 6.
Further, the right support member 15 is formed with a hole 22 at a position eccentric by ΔH below the center Y of the sub casing 6, and in a state where the hole 22 coincides with the center of the hole 22, that is, the center X of the rotor 10. The flange portion 11 a of the hydraulic motor 11 is fixed to the right support member 15 with a bolt 24.
[0014]
A pair of left and right guide rollers 25 are attached to the rotor 10, and the guide rollers 25 regulate the meandering of the pumping tube 3. A restricting member 26 is pivotally supported on the rotor 10, and the restricting member 26 restricts the pumping tube 3 from being separated from the casing 2 due to the pressing and rolling of the roller 17.
[0015]
An elastic pad 27 is provided between the inner wall of the casing 2 and the pumping tube 3, and the left and right sides of the pad 27 are fixed to the casing 2 with stopper members (not shown). The pad 27 reduces the frictional resistance with the casing 2 when the pumping tube 3 is moved somewhat back and forth by being pressed by the roller 17, and the pebbles contained in the ready-mixed concrete in the pumping tube 3 are reduced. It plays the role of absorbing the deformation of the pumping tube 3 when sandwiched.
[0016]
Next, the operation of the concrete pump 1 having the above configuration will be described. First, when the rotor 10 is rotated in the arrow Z direction by the hydraulic motor 11 from the state shown in FIG. 2, the lower roller 17 rolls upward while pressing the pumping tube 3, and the upper roller 17 moves from the pumping tube 3. Move away and down. As a result, the pumping tube 3 behind the lower roller 17 sucks the ready-mixed concrete by returning to its original circular shape by its own elastic restoring force, and the ready-mixed concrete in the pumping tube 3 ahead of the lower roller 17 becomes Pumped forward. At this time, since the inner diameter of the pumping tube 3 is tapered, when the roller 17 rotates slightly in the direction of the arrow from the position of FIG. 2, the sealed chamber 18 between the pair of rollers 17 is somewhat pressurized. Become. When the inside of the pumping tube 3 is opened by releasing the pressure of the roller 17 in this state, the difference between the pressure in the sealed chamber 18 and the pressure in the front is small, so that the back flow of the ready-mixed concrete is reduced and the inner surface of the pumping tube 3 is worn. Can be reduced.
[0017]
Further, when the concrete pump 1 is manufactured, in order to attach the center X of the rotor 10 to be deviated downward from the center Y of the casing 2 by ΔH, first, with the sub casing 6 removed from the main casing 5, The rotor 10 is inserted into the main casing 5 and the rotating shaft 13 is attached to the left support member 16. Next, the sub casing 6 is fixed to the main casing 5 with bolts 7, and the flange portion 11 a of the hydraulic motor 11 is fixed to the right support member 15 with bolts 24. As a result, the center X of the rotor 10 is arranged at a position lower than the center Y of the casing 2 by ΔH. Therefore, the through-hole 6a for attaching the ring R to the sub casing 6 may be processed with the center Y of the casing 2 as the center (based on the reference), and the processing operation becomes very easy.
[0018]
FIG. 4 is a cross-sectional view showing another embodiment, and FIG. 5 is an assembly view of the right support member. In this embodiment, the right support member 15 is composed of a main support member 19 and an auxiliary support member 20, and the main support member 19 is fitted in a mounting hole 21 provided concentrically with the center Y of the subcasing 6. In this state, the bolts 14 are attached to the sub casing 6. Accordingly, the main support member 19 is provided concentrically with the center Y of the sub casing 6.
Further, a hole 22 is formed in the main support member 19 at a position eccentric by ΔH below the center Y of the sub casing 6, and in a state where it is aligned with the center of this hole 22, that is, the center X of the rotor 10. An annular auxiliary support member 20 having concentric inner and outer peripheries is fixed to the main support member 19 with bolts 23, and the flange portion 11 a of the hydraulic motor 11 is fixed to the auxiliary support members 20 with bolts 24.
[0019]
According to this embodiment, after the auxiliary support member 20 of the right support member 15 is fixed to the hydraulic motor 11 and the main support member 19 with the bolts 23 and 24, the main support member 19 is attached to the sub casing 6 with the bolt 14. The center X of the rotor 10 can be arranged at a position lower than the center Y of the casing 2 by ΔH. Therefore, the attachment hole 21 for attaching the right support member 15 to the sub casing 6 may be processed with the center Y of the casing 2 as the center (based on the reference), and the processing operation becomes very easy.
[0020]
In the above-described embodiment, the support member having the eccentric hole 22 is configured only on the sub casing 6 side, but a support member having a similar structure can also be employed on the main casing 5 side. Further, a support member having a similar structure may be employed only on the main casing 5 side.
[0021]
【The invention's effect】
As described above, according to the squeezed concrete pump of the present invention, the processing to the casing itself necessary for attaching the support member can be performed with reference to the center of the casing, so that the processing is very easy. In addition, the conventional special jig is not required and can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is an overall view of a squeezed concrete pump according to the present invention.
FIG. 2 is an overall sectional view of a squeezed concrete pump.
FIG. 3 is a cross-sectional view taken along line A-O-A in FIG.
FIG. 4 is a cross-sectional view showing another embodiment.
FIG. 5 is an assembly view of the right support member of the embodiment shown in the previous figure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Squeezing type concrete pump 2 Casing 3 Pumping tube 5 Main casing 6 Sub casing 10 Rotor 15 Right support member 16 Left support member 17 Roller 19 Main support member 20 Auxiliary support member X Center of rotor Y Center of casing

Claims (2)

In the cylindrical casing, a rotor having a roller is rotatably provided, and a pumping tube tapered so that the outer diameter is substantially equal and the inner diameter gradually decreases toward the discharge side is provided along the inner wall of the casing. The center of the rotor is eccentric from the center of the casing, and the pumping action is applied by the pressing action of the pumping tube by the roller and the restoring action of the pumping tube itself to suck the ready-mixed concrete into the pumping tube, and the sucked ready-made concrete is pumped. In the squeeze-type concrete pump that
A pair of support members for supporting the rotor is attached to the casing,
At least one support member of the pair of support members is attached to the casing so as to coincide with the center of the casing ,
The squeezing is characterized in that a hole is formed in the at least one support member at a position eccentric from the center of the casing, and the rotor is attached in a state where the center of the rotor is aligned with the center of the hole. Type concrete pump. In the cylindrical casing, a rotor having a roller is rotatably provided, and a pumping tube tapered so that the outer diameter is substantially equal and the inner diameter gradually decreases toward the discharge side is provided along the inner wall of the casing. The center of the rotor is eccentric from the center of the casing, and the pumping action is applied by the pressing action of the pumping tube by the roller and the restoring action of the pumping tube itself to suck the ready-mixed concrete into the pumping tube, and the sucked ready-made concrete is pumped. In the squeeze-type concrete pump that
A pair of support members for supporting the rotor is attached to the casing,
At least one of the pair of support members includes a main support member and an auxiliary support member,
The main support member is attached to the casing so as to coincide with the center of the casing, and a hole is formed at a position eccentric from the center of the casing.
The auxiliary supporting member, the supporting by decentering the rotor relative to the casing center by Rukoto attached to the hole of the center and the main support member is aligned with the center of the rotor of the main support member A squeeze-type concrete pump.

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