JP5014755B2 - Rotary feeder for powder - Google Patents

Description

  The present invention relates to a rotary feeder for powder.

  The present invention provides a grinding wear countermeasure mechanism for powder rotary feeders that handle metal powders that are also used as polishing and grinding agents.

For example, a steelmaking converter at a steel works uses a deoxidizer (metal powder such as Al, Mg, Ti, Si, etc.) and a reducing agent (CaC2) necessary to adjust the molten steel components while quantitatively analyzing molten steel by computer control. , CaCO3, CaF, etc.) are added quantitatively over time.
For this addition, a large number of powder hoppers are installed on the converter or the like, but a powder rotary feeder for cutting out the powder is required to have a high-precision quantitative cutting function for adjusting the components.

  Thus, in this powder rotary feeder, a circular casing is connected to the powder falling part of the lower part (cylindrical shape) of the powder hopper for storing the air-conveyed powder, and 8 to 12 sheets are contained therein. The rotary part which consists of this rotary blade is arrange | positioned, and powder is discharged | emitted quantitatively from the discharge pipe connected with the powder cut-out part of the casing by rotation of a rotary blade. However, the abrasive wear of the blades of the rotary part and the inner wall surface of the casing, which are most in contact with the powder, is severe.

  When the rotary blades of the rotary part and the inner wall of the casing facing the rotation trajectory wear, the opposing gap widens and the amount increases. The cutting function, that is, the accuracy of the amount of powder added is remarkably lowered, making it difficult to adjust the molten steel composition.

  As a measure to suppress wear of the rotary feeder for powders, wear-resistant metal is welded on the rotary blades of the rotary part and the inner wall surface of the casing and then ground and reinforced, but it passes through the powder falling part of the casing. The inner rotating blade is curved with more wear at the center than on both sides thereof, and it is extremely difficult to maintain the gap within 0.1 to 0.3 mm for a long time.

Therefore, if the gap between the rotary part of the powder rotary feeder and its casing part is measured during use and the rotary part and the rotating blades are replaced before the limit value, the addition accuracy can be maintained within an allowable range.
However, the conventional measurement of the gap between the rotary part and its casing part is based on a regular measurement about once a month. For this reason, replacement work of the rotary part and its casing and repair work by overlay welding are short-term work, which is complicated and requires a great deal of time and labor.

  In the present invention, the replacement time is when the appropriate gap between the casing and the rotating rotary and its rotating blades is worn by the falling powder. If the gap between the two can be adjusted, a rotary feeder is provided that can be adjusted by the amount of clearance when the limit is regularly predicted by measuring and grasping the amount of wear over time. To do.

The present invention has been made to solve the above problems, and the features thereof are the following (1) to (3).
(1) A horizontal cylindrical rotary casing is connected to the lower part of the powder hopper that stores the powder via a powder introduction casing, and a rotary with a rotating blade is provided around the rotary casing and a discharge rod is provided. In the powder rotary feeder provided continuously, a gap adjustment casing is provided in the powder introduction casing to move the lower end edge closer to and away from the rotation trajectory surface of the rotary blade tip of the rotary so as to be movable up and down, and the gap adjustment casing is held. Powder introduction includes a compression spring type support mechanism that sets the basic position, and an air cylinder type gap adjustment mechanism that holds the gap adjustment casing and sets and holds the lower end edge position with respect to the rotation trajectory surface of the rotating blade tip at a predetermined interval position. A rotary feeder for powder, which is attached to a casing.
(2) The powder rotary feeder according to claim 1, wherein a Teflon (registered trademark) resin plate is disposed and fixed inside a metal plate at least at a lower portion of the gap adjusting casing.
(3) A compression spring type support mechanism for setting the basic position of the gap adjustment casing is provided on the outer wall side of the powder introduction casing, and the lower end edge position of the gap adjustment casing is set and held at a predetermined interval position. 2. The rotary feeder for powder according to claim 1, wherein the gap adjusting mechanism is provided in the center of the inner space of the powder introduction casing.

Since the present invention is the powder rotary feeder having the above-described configuration, the adjustment nut 305 of the compression spring type support mechanism 301 is tightened and rotated to lower the gap adjustment casing 201 to lower the lower end of the lower Teflon (registered trademark) resin plate 203b. The edge is pushed into the rotation trajectory surface at the tip of the rotary blade 106 of the rotary and is self-ground to form an arbitrary shape along the rotation trajectory surface of the rotary blade 106. After this, the adjustment nut 305 is once loosened and rotated to raise the gap adjustment casing 201, and the rotary gap X (the gap between the rotary blade 106 rotation trajectory surface and the lower edge of the Teflon (registered trademark) resin plate 203b) is expanded from 0 to 5 mm. The position is changed to the descent start position of the automatic fine adjustment of the rotary gap X by the air cylinder type gap adjustment mechanism 401. Next, the air cylinder type gap adjustment mechanism 401 lowers the gap adjustment casing 201 set by the compression spring type support mechanism 301 and sets the rotary gap X at the lower end thereof to a predetermined arbitrary control value, for example, 0.1 to 0.3 mm. It can be reliably maintained over the range.

As a result, even if the rotary gap X is reduced, it is used for the addition of powder for refining, which is exposed to a high temperature and dusty environment such as on a furnace such as a steelmaking converter. In addition, there is no seizure or abnormal wear due to high temperatures, and the rotary clearance X can always be accurately adjusted within the specified control range.
For this reason, the original quantitative cut-out function of the powder rotary feeder, that is, the powder addition amount accuracy is stably maintained at a high level, and the molten steel component adjustment in a steelmaking converter or the like is made extremely accurate.
Further, the rotary part and its casing which are complicated and require a great amount of time and labor, and the repair work by overlay welding have an excellent effect such as being unnecessary over a long period of time.

  An embodiment of the present invention will be described in detail with reference to FIGS.

  1 and 2, the basic components of the powder rotary feeder of this example are a powder hopper 100 for storing air-conveyed powder, and a reducer 101 (conical) connected to the lower part of the powder hopper 100. Shape), a rounded short rod 102 connected to the lower part of the reducer 101, and a horizontal cylindrical shape connected to the rounded short rod 102 via a first introducing casing 103 and a second introducing casing 104 having a rectangular tube shape as an introducing casing. Rotary casing 105 coated with hard Cr on the inner surface, rotary 107 with 8-12 rotating blades 106 housed in the rotary casing 105 and overlayed with AlBC and spirally arranged at 15-30 °, and the rotary casing The discharge rod 108 connected to the lower discharge port of 105, the powder from the second introduction casing 104 is introduced into the rotary casing 105 by the rotation of the rotary vane 106 by the rotary 107, and quantitatively discharged into the discharge rod 108 To do.

  The rotary 107 and the rotary casing 105 are built up of an AlBC copper alloy that does not seize even if they come into contact with each other. Expansion of the gap can also be suppressed by expansion.

The basic structure of the improved part in the powder rotary feeder is that the gap between the rotary 107 and the lower end edge, that is, the gap adjusting casing 201 for adjusting the rotary gap X, and the gap adjusting casing 201 are moved up and down to move the position of the lower end edge. A compression spring type support mechanism 301 to be set, and an air cylinder type gap adjustment mechanism 401 for setting the lower end position of the gap adjustment casing 201 to a predetermined position required for the rotary gap X.
[Description of gap adjustment casing 201]
1, 2, and 3, the gap adjustment casing 201 is in a square tube state, that is, in this example as a tetrahedron, the gap adjustment is easy to take, and a flange 202 having a shape retaining effect is provided at the upper end thereof. The main body 203 is fitted into the square cylindrical second introduction casing 104 so as to be vertically slidable, the lower part of the rectangular pipe 103 is slidably fitted into the upper part, and the lower end edge 204 is connected to the rotary casing 105 and the second casing. The rotary gap X is maintained at a predetermined value by projecting toward the rotary 107 side from the joint portion with the two introduction casings 104.

  The flange 202 is located in a rectangular gap ring 205 formed at the joint between the joint flange 103a of the first introduction casing 103 and the joint flange 104a of the second introduction casing 104.

As shown in FIG. 4, the rectangular tubular body 203 has a double structure in which a Teflon (registered trademark) resin plate 203b is lined on a metal plate 203a such as an iron plate or a stainless steel plate. Teflon (registered trademark) resin plate 203b has the effect of preventing powder adhesion, wear resistance, heat resistance (Max 180 ° C), low friction coefficient μ = 0.04 to 0.1 (by the way, low friction coefficient μ of metal hardened surface = 0.2 to 0.4), with the lower edge protruding to the rotary 107 side.

As shown in FIG. 4, the mounting of the Teflon (registered trademark) resin plate 203b on the metal plate 203a is performed by laser cutting and bending the beer stopper-shaped crown 206 at a suitable position on the metal plate 203a by 3 to 5 ° in advance. Glass / carbon fiber 210 is bonded with an adhesive using the other as a bonding surface, and Teflon (registered trademark) resin plate 203b is placed on this and steam-heated to soften the Teflon (registered trademark) resin plate 203b. The glass and the carbon fiber part 210 are strongly heat-bonded by biting into the part and mechanically bonding while maintaining shear strength. As a result, as shown in (2) of FIG. 4, the Teflon (registered trademark) resin plate 203b is closely attached to the metal plate 203a. The corners of the rectangular cylindrical main body 203 are formed by hot air welding between Teflon (registered trademark) resin plates 203b.
[Description of compression spring type support mechanism 301]
As shown also in FIG. 5, the compression spring type support mechanism 301 for the gap adjustment casing 201 has the adjustment bolt 302 fixedly connected to the lower surface of the flange 202 of the gap adjustment casing 201 and the lower part of the adjustment bolt 302 is introduced to the second. The connecting flange 104a of the adjustment bolt 302 is arranged in a protruding manner through the connecting flange 104a of the casing 104. The spring 303 is arranged in a compressed form on the outer peripheral surface of the adjustment bolt 302 located in the rectangular gap ring 205 and the spring case 304. The adjustment nut 305 is screwed into the protruding portion. As a result, the adjustment nut 305 is rotated to raise and lower the gap adjustment casing 201 via the flange 202.

In the usage example of the compression spring type support mechanism 301, the adjustment nut 305 is tightened and rotated to lower the gap adjustment casing 201, and the tip edge of the Teflon (registered trademark) resin plate 203b at the lower end is pressed against the rotary to rotate the rotating blade 106. Then, self-grinding (cutting) into a spiral shape is performed to form a shape along the rotating blade 106. After this, the adjustment nut 305 is once loosened and rotated to raise the gap adjustment casing 201, and the rotary gap X is expanded and changed from 0 to 5 mm. The air cylinder type gap adjustment mechanism 401 (described later) performs automatic fine adjustment of the rotary gap X. This is the lowering start position.

Also, during operation, the tip edge position of the Teflon (registered trademark) resin plate 203b at the lower end of the gap adjustment casing 201 is worn and the rotary gap X does not exceed the corresponding range of the air cylinder type gap adjustment mechanism 401.
At any time, the adjustment nut 201 is lowered by the adjustment nut 305, the tip edge of the Teflon (registered trademark) resin plate 203b at the lower end is pressed against the rotary, and self-grinding is performed by the rotation of the rotary blade 106, and the shape along the wear curve of the rotary blade 106 By repeating this, long-term operation is advantageously made possible.
[Description of air cylinder type gap adjustment mechanism 401]
The air cylinder type gap adjustment mechanism 401 lowers the gap adjustment casing 201 set by the compression spring type support mechanism 301 by 4.9 mm and automatically sets and maintains the rotary gap X at 0.1 mm. The air collision mechanism 403a of the wear prevention stellite # 1 to # 6 is hardened on the powder impingement part 403a at the tip of the part 403, and the vertical air cylinder mechanism 402 is fixedly connected to the square pipe 103. Fixedly connected to the cross beam 406, which supports the cylinder portion 403, embeds air pipes 404 and 405, hardens the stellite # 1 to # 6 on the surface layer and forms an acute angle of 45 to 60 ° at the upper end, and the gap adjustment casing 201 It is composed of a cross support beam 409 connecting the central part to the tip of the piston rod 407 of the air cylinder mechanism 402 in a vertical arrangement and a pressure air supply / discharge mechanism to the air cylinder mechanism 402 A.

  As shown in FIG. 6, the pressure air supply / discharge mechanism includes an air filter 409a, a regulator 409b, and an electromagnetic valve 409c for pressure ultra-precision control. The position of the piston portion 408 in the air cylinder portion 403 held at 0.3 mm is held at a constant and high accuracy.

The present invention is used for adding powder for refining that is exposed to a high temperature and dusty environment such as on a furnace such as a steelmaking converter. The rotary gap X between the rotary and the lower end edge of the gap adjustment casing 201 can always be accurately adjusted within a predetermined control range without any wear or seizure due to high temperature or abnormal wear.
For this reason, the original quantitative cut-out function of the powder rotary feeder, that is, the powder addition amount accuracy is stably maintained at a high level, and the molten steel component adjustment in a steelmaking converter or the like is made extremely accurate.
In addition, the rotary part and its casing which are complicated and require a lot of time and labor, and the repair work by the overlay welding have an excellent effect such as being unnecessary over a long period of time. There is a great deal of applicability in the manufacturing industry using the rotary feeder for powder handling, handling industry, etc.

It is a longitudinal section explanatory view from the front showing one embodiment of the present invention. It is longitudinal cross-sectional explanatory drawing from the side surface of FIG. It is a plane explanatory view of the gap adjustment casing of FIG. It is manufacture explanatory drawing of the square cylindrical main body of FIG. It is an expansion detailed explanatory view of the compression spring type support mechanism of FIG. It is a conceptual diagram which shows the pressure air supply / discharge mechanism to the air cylinder mechanism of FIG.

100 powder hopper
101 reducer
102 round corner
103 First introduction casing
104 Second introduction casing
105 plated rotary casing
106 Rotating blade
107 Rotary
108 discharge
X Rotary clearance
201 Clearance adjustment casing
301 Compression spring type support mechanism
401 Air cylinder type gap adjustment mechanism
202 flange
205 Rectangular gap ring
203 Square body
203a metal plate
203b Teflon (registered trademark) resin board
206 Beer cap crown
210 Glass / carbon fiber

Claims (3)

A powder with a horizontal cylindrical rotary casing connected to the lower part of a powder hopper for storing powder via a powder introduction casing, and a rotary with rotating blades around it. In the body rotary feeder, a clearance adjustment casing that allows the lower end edge to approach and separate from the rotation trajectory surface of the rotary blade tip of the rotary is provided in the powder introduction casing so as to be movable up and down, and holds the clearance adjustment casing and sets its basic position. A compression spring type support mechanism to be set and an air cylinder type gap adjustment mechanism that holds the gap adjustment casing and sets and holds the lower end edge position with respect to the rotation trajectory surface of the rotating blade tip at a predetermined interval position are attached to the powder introduction casing. A powder rotary feeder. The rotary feeder for powder according to claim 1, wherein a Teflon (registered trademark) resin plate is disposed and fixed inside a metal plate at least at a lower portion of the gap adjustment casing.   The compression spring type support mechanism for setting the basic position of the gap adjustment casing is provided on the outer wall side of the powder introduction casing, and the air cylinder type gap adjustment mechanism for setting and holding the lower end edge position of the gap adjustment casing at a predetermined interval position is The rotary feeder for powder according to claim 1, wherein the rotary feeder for powder is provided in the center of the inner space of the powder introduction casing.

Images