JP2006255903A - Hopper discharge gate for concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a hopper discharge gate for concrete having an opening reduced in a longitudinal/lateral ratio or having a shape near to a circular shape and to simplify the setting or adjustment of the hopper discharge gate while facilitating the maintenance thereof. <P>SOLUTION: The hopper discharge gate is constituted so that a press roller support member comprising a plurality of rollers is provided to the outside of the rubber seal of a hopper discharge port to press the rubber seal by the expansion and contraction of a cylinder to perform the on-off of the gate, the support members for supporting the outside shafts of the opposed rollers are always energized in the direction mutually holding the rubber seal by a holding and pressing members to press the rubber seal, the arrangement of two rollers is made linear by the cylinders when the gate is brought to a closed state to hold and press the rubber seal, the connection part of two rollers are bent in an opening initial stage to arrange the rollers to an almost C-shape and the opening cross section of the rubber seal is made circular by the cylinders in a usual stage for bringing the gate to a full open state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

   The present invention relates to a discharge gate of a hopper such as concrete used in a ready-mixed concrete plant or the like.

  The present invention is a so-called rubber seal gate because it is necessary to block liquid because the ready-mixed concrete is composed of gravel, sand, cement, water, etc. However, as disclosed in Patent Document 1, for example, a rubber seal is pressed between a pair of rollers to completely seal the liquid.

By the way, as described above, the discharge gate of a concrete hopper used in a ready-mixed concrete plant or the like is a concrete discharge gate that sandwiches the rubber seal a with a pair of rollers b ′, as shown in FIG. Since only the narrow gap opening B ′ that widens the interval is formed, gravel j having a large particle diameter cannot be discharged smoothly although the liquid falls.
For this reason, as shown in FIGS. 8 and 9, the applicant of the present invention, in the concrete discharge gate that presses the rubber seal a to open and close the gate, linearly arranges the two rollers b of the pressing roller support member. When the cylinder main body c arranged in the shape of the shape and the shape of “ku” is provided and the rubber seal a is pressed to close the gate, as shown in FIGS. In an initial stage in which the arrangement of the rollers b is linearly pinched to be in the closed state A and the gate is in the half-open state B, as shown in FIGS. As shown in FIG. 10, in the normal stage in which the rubber seal retreats as the shape of “<” and the opening cross section B of the rubber seal is rhombus and the gate is fully opened, the roller b is formed so that the open cross section C of the rubber seal is circular. Evacuate to the outside and not only liquid but also gravel D in the initial stage of opening. It provides a concrete hoppers discharge gate can be discharged to the over scan (Patent Document 2).

  The concrete configuration and operation of the concrete hopper discharge gate will be described mainly with reference to FIG. 8. The cylinder drive shaft d is provided with a stopper g at an intermediate position between the bearing e of the roller b at the tip and the roller support frame f. A spring stop h is provided between the roller support frame f and the cylinder body c in the cylinder drive shaft d, and a spring i is provided between the roller support frame f and the spring stop h to press them in the opposite direction. In the initial stage in which the gate is in the half-open state C, when the cylinder driving shaft d is contracted and retracted into the cylinder body c in order to make the arrangement of the two rollers b and b approximately “<”, The bearing e at the tip of the cylinder drive shaft d moves backward with respect to the roller support frame f, and the two rollers b also change from a linear arrangement to a “<” shape arrangement with the tip bearing e as a bending point. Closed opening With respect to the line, the axis of the roller b is not parallel but oblique, so that the whole becomes a rhombus opening B in cross section.

Therefore, the rhombic opening B having the angle of inclination of about “<” in the initial stage of opening has a large maximum opening distance in the initial stage (twice the maximum gravel particle size) even though the opening area is the same as the conventional one. 5 times), and as shown in FIGS. 9A and 9B, gravel j having a diameter of 5 cm or less is allowed to pass.
As described above, in order to obtain the diamond-shaped opening B in the cross section, in the prior art, the stopper g is provided to regulate the degree of bending of the “<” and the two gates in the normal stage where the next gate is fully opened. The roller b is for retracting the roller support frame f and the like to the outside as the cylinder shaft d is retracted so that the opening cross section of the rubber seal a becomes a circular opening C (inner wall diameter of about 50 cm).
That is, when the cylinder shaft c is retracted, the roller support frame f does not swing until the stopper g comes into contact with the roller support frame f. However, as shown in FIG. 10, the stopper g contacts the roller support frame f. When in contact with each other, the two rollers b arranged in the shape of "<" are retracted to the normal stage, and the cylindrical rubber seal a is not restricted by the two rollers b, so the gate is fully open. Then, an opening having an original circular shape C is obtained.
Further, when the cylinder drive shaft d is retracted, the spring i presses the roller support frame f and the spring stop h in the opposite directions to prevent the two rollers b from returning in a straight line. This is for maintaining the fixed position of the two rollers b.
JP 2001-341120 A Japanese Patent Application No. 2004-270421

By the way, the concrete hopper discharge gate of Patent Document 2 is always provided with a spring i that presses the roller support frame f and the spring stop h in the opposite direction, so that the two rollers b can be fixed. The position must be maintained, but for this reason, the pair of cylinder drive shafts d must be lengthened by the length of the spring, the entire width of the cylinder portion becomes large, and the hopper discharge gate becomes large. There was a problem.
In addition, since the operation by the spring i is involved in two stages of the opening initial stage B and the full opening stage C, it is difficult to set the elasticity, and since it is fitted coaxially to the cylinder drive shaft, it takes time and effort to replace it. There was a problem of being troublesome.

  The present invention has been made in view of the above-described disadvantages, and shortens the pair of cylinder drive shafts of the concrete hopper discharge gate to reduce the size of the hopper discharge gate, and to set and adjust a spring that cooperates with the cylinder. It is possible to provide a hopper discharge gate that can be easily and easily maintained.

In order to solve the above problems, the invention of claim 1 is characterized in that a cylindrical rubber seal is attached to the discharge port of the hopper, and a pressing roller support member comprising a plurality of rollers sandwiches the rubber seal outside the rubber seal. In the concrete discharge gate, which is disposed in an opposing position and presses the rubber seal by the expansion and contraction of the cylinder and opens and closes the gate, the arrangement of the two rollers of the pressure roller support member is linear. And a pair of cylinders arranged in an approximately "<" shape, and a support member for supporting the outer shaft of the opposing roller is provided, and the opposing support members are always attached in a direction in which they are pressed against each other by a pressing member. When the rubber seal is pressed and the gate is closed, the two rollers are linearly clamped by the cylinder and the opening is opened. In the stage, the connecting parts of the two rollers are bent and arranged in an approximately "<" shape, and in the normal stage in which the gate is fully opened, the roller is moved outward so that the rubber seal has a circular opening cross section by the cylinder. A hopper discharge gate for concrete, wherein the hopper discharge gate is characterized in that it is evacuated.
In the invention of claim 2, a bearing member for the roller is provided at a portion connecting the two rollers of the pressing roller support member located at the center of the support member of the roller, and the two bearing members are provided. 2. The concrete hopper discharge gate according to claim 1, wherein the rollers are a pair of spherical bearing members that can be bent and rotated in an approximately “<” shape.
According to a third aspect of the present invention, a cover member is provided on the bearing member so as to cover the bearing member, and a portion of the cover member that contacts the rubber seal is a contact surface that contacts the rubber seal of two rollers. 3. The concrete hopper discharge gate according to claim 1, wherein a substantially continuous compression surface is formed.
The invention according to claim 4 is characterized in that a swing support member that prevents bending in the vertical direction independent of the press roller support member is provided in a portion connecting the two rollers of the press roller support member. The concrete hopper discharge gate according to claim 1.

  According to the present invention, the length of the cylinder drive shaft of the opposing cylinder can be shortened, the entire width of the cylinder portion can be shortened, and the hopper discharge gate can be reduced in size. Unlike the case where it is mounted on the opposite cylinder drive shaft, the active pressure member is provided on the opposite roller support member, so that it is possible to easily set and adjust the pressure from the outside, and to facilitate maintenance. Play.

  In the two-stage system in which the hopper discharge gate is initially maintained in the initial stage B at the initial stage B and then gradually opened to the fully-open stage C, the air that is a negative pressure member is used for the two stages. (Hydraulic) It is necessary to cooperate the cylinder and the spring, but the position and operation of this spring is changed from the prior art, the cylinder drive shaft of the cylinder part is shortened, the overall width is shortened, Furthermore, since the spring, which is a pressure member, is provided on the supporting member of the opposite roller, unlike the conventional case where it is provided coaxially with the cylinder shaft, setting and adjustment of the pressure can be simplified and maintenance is easy. Become.

Here, an embodiment of a concrete hopper discharge gate suitable for the present invention will be described with reference to the drawings.
Fig. 1 is a cross-sectional view of the vicinity of the discharge port at the bottom of the hopper for storing (manufacturing) raw concrete mixed with cement, gravel, sand, water, etc., Fig. 2 is a plan view of the main part of Fig. 1, and Fig. 3 is In the side view of the main part of FIG. 1, a cylindrical rubber seal 2 is fixed to the outside of the lower discharge port 11 of the hopper 1 with an attachment band 12 or the like. As shown in FIG. 4, the rubber seal 2 has an appropriate thickness, and is provided with an abrasion-resistant rubber 21 on the inner periphery, and a nylon hub 23 is embedded in the outer peripheral rubber 22. A pair of pressing roller support members 3 composed of rollers 4 are disposed on opposite sides of the rubber seal 2 so that the rubber seals 2 are mutually connected by the extension of the air (hydraulic) cylinder 5. As shown in FIG. 5 (b), the discharge gate is kept in the half-open state B and in the fully open state as shown in FIG. 5 (c). In the case of the shape C, the cylinder 5 is operated in a contracting direction by a command from the operation unit.

As shown in FIG. 1, the pressing roller support member 3 and the cylinder 5 are provided on a fixed frame 13 near the lower discharge port 11 of the hopper 1, and the upper ends of the pair of pressing roller support members 3 are fixed frames 13. The link arm 311 is stretched around the pair of rotating shafts 31 in the vicinity of the discharge port 11 so that the swing angles of the pair of opposed pressure roller support members 3 are the same, and the pressure roller support member 3 is provided with two pressing rollers 41a and 41b (41a 'and 41b') on each side, and a driving shaft 51 of the cylinder 5 is connected to the pressing rollers 41a and 41b in the extending and contracting direction. This is also slidably mounted via each cylinder mounting member 52 provided.
In addition, the pair of pressing roller support members 3 facing each other on both sides of the apparatus are always urged in the direction in which they are pressed against each other by the pressing member 7, and when the rubber seal is pressed and the gate is closed. Two cylinders are linearly clamped by the cylinder, and at the initial stage of opening, the connecting part of the two rollers is bent and arranged in an approximately "<" shape or semi-ellipse, and the gate is fully open. In the normal stage, the roller is retracted outward by the cylinder so that the opening cross section of the rubber seal becomes circular.

Further detailed configurations of the pressing roller support member 3, the roller 4, and the cylinder 5 will be described with reference to FIGS.
FIG. 2 is a plan view of the main part of the lower end portion of the oscillating pressing roller support member 3 as viewed from above. The thrust roller 36 is composed of a pair of both end frames 32 and a connecting frame 33. The support frame is pivotally connected by a pivot pin 38 (see FIG. 4B), and the distance between the pair of both end frames 32 is the same as that when the cylindrical rubber seal 2 is pressed. It is slightly wider than the width, and one end of each end frame 32 is rotated by the rotation pin 38 on the pressing roller support member 3 so that the thrust bearing 36, which is an oilless bearing, allows the cylinder drive shaft 51 to be straight. It is supported freely. Further, as shown in FIG. 1, the upper end portion of the pressing roller support member 3 is pivotally supported about a rotation shaft 31.
Two pressing rollers 41a and 41b are connected in a linear direction to both end frames 32 at the lower end of the pressing roller support member 3, and as shown in FIG. ) 34a is provided, and a bearing 34a for the roller shaft 42a is rotatably and axially moved to the bearing 34a at a position where it is bent to the outside of the substantially central portion of both end frames 32 of the roller 41a. It is pivotally supported. As will be described later, the roller shaft 42a has a predetermined length so as to allow movement when the pressing rollers 41a and 41b are pulled, and the end portion is smaller than the inner diameter of the bearing 34a to prevent dropping. A stopper 43a having a larger diameter is also provided. On the other hand, the roller shaft 42a on the inner side of the roller 41a is rotatably supported by a swingable bearing 35a on the tip 54 of the cylinder drive shaft 51 of the main body 53 of the cylinder 5, and the end of the roller shaft 42a is supported. The spherical convex oilless bearing 45a is provided to prevent falling off.

Here, the detailed structure of the bearing 34a will be described with reference to FIG. 4. A bearing frame body 341 is attached to both ends of the pressing roller support member 3 by fixing tools 342. A main body 343 is fitted, and on the other hand, an oilless bearing 344 is provided on the outer periphery of the roller shaft 42a in contact with the bearing main body 343 which is an oilless bearing, and is configured to be movable in the thrust direction. Therefore, the roller shaft 42a is supported by the bearing 34a so as to be rotatable and movable in the axial direction.
Further, the tip 54 of the cylinder drive shaft 51 is provided with a bearing portion at the connecting portion of the two rollers 41a and 41b, but as will be described later, at the initial stage of opening, the two rollers are connected at the connecting portion. It is arranged in an approximately “<” shape by bending the axial direction.
The distal end portion 54 and the cylinder drive shaft 51 are connected by a rotatable connecting member 55, and the central bearings 35a and 35b for the roller shafts 42a and 42b of the two rollers 41a and 41b are paired with the pair of the distal end portion 54. It is fixed to the bearing mounting portions 541a and 541b, and the two bearing mounting portions 541a and 541b are mounted to the central bearing frame body 542 with bolts or the like. The other pressing roller 41b is also a surface object with respect to the center of the tip end portion 54, and has the same configuration.
The front end portion 54 is provided with a cover member 56 so as to cover the entire bearing members such as the central bearings 35a and 35b, and the front end portion of the cover member 56 contacting the rubber seal 2 is formed by a rubber seal of two rollers. It forms a compression surface that is substantially continuous with the contact surface that is in contact with the contact surface, and is made of a structure and material that can be pressed.

  The cylinder 5 will be described. As shown in FIG. 1, the main body 53 of the cylinder 5 is also slidably mounted via a cylinder mounting member 52 provided on the frame 13, and moves forward and backward from the main body 53 of the cylinder. The cylinder drive shaft 51 is temporarily supported by a thrust bearing 36, and this thrust bearing 36 is provided at substantially the center of a connecting frame 33 that is swingably supported at the lower end of the pressing roller support member 3. End frames 32 are provided at both ends, and the end portions of the end frame 32 are swingably supported by the pressing roller support member 3 by a rotation pin 38. Further, as described above, the center bearings 35a and 35b are provided at the tip 54 of the tip of the cylinder shaft 51. FIGS. 4 and 5A show the case where the gate is in the closed state A. FIG. 6 is a view of a state where the cylinder drive shaft 51 of the cylinder 5 is extended and the rubber seals 2 are pressed against each other by extension. That is, the arrangement of the two rollers 41a and 41b of the pressing roller support member 3 is a straight line, and the two linear rollers 41a and 41b narrow the rubber seal 2 to close the gate. .

The tip 54 is configured such that when concrete or the like is discharged to the rubber seal 2, a very large load is applied, and the central bearings 35a and 35b at the connecting part of the two rollers 41a and 41b can be bent. Therefore, as shown in FIG. 6, a tip support member 6 that is a suspended swing support member is provided to prevent bending in the vertical direction.
The swing center shaft 61 of the tip support member 6 is coaxial with the shaft 31 of the pressure roller support member 3, and the other end of the swing arm 62 is fixed to the upper end portion 57 of the central bearing frame 542 of the tip portion 54. In other words, in a suspended state, the cylinder drive unit 51 moves forward and backward to prevent vertical movement at the connecting part of the two rollers, and the axial direction is bent in a horizontal plane and arranged in an approximately “<” shape. To do.
The swing angle and behavior of the swing arm 62 of the tip support member 6 are different from those of the press roller support member 3 even if they are coaxial with the press roller support member 3 and the swing center shaft 31. The moving arm 62 is configured to prevent the bending in the vertical direction by independently supporting the tip 54 in a suspended manner.

Next, the pressing member 7 will be described. As shown in FIGS. 1 and 6, as shown in FIGS. 1 and 6, the coil is contracted and urged by the opposing spring engaging portions 37 of the pair of pressing roller support members 3 that swing oppositely. As shown in FIG. 5 (a), the rubber member 2 is pressed in such a manner that the spring 72 is spanned with a desired strength by a fixing member 371 capable of adjusting the spring contraction force, and is always urged in the direction of mutual compression. Then, when the gate is in the closed state A, the cylinder is clamped with the arrangement of the two rollers linearly, and as shown in FIG. The tip 54 also moves backward (arrow x), but the connecting frames 33 at both ends of the pressing roller support member 3 are prevented from moving backward by the coil spring 72 pressure (arrow y), and the two rollers are connected. The part is arranged in the shape of the letter “B” with the tip 54 as the bending point, and the mouth is closed The roller axis 42 is not parallel to the opening line Z, but is slanted to form a rhombus opening B as a whole, and the opening area is gradually increased from the initial stage to the normal stage. ), In the normal stage C in which the gate is fully opened, the cylinder drive shaft 51 is further retracted, the rear end portion of the bearing frame body 341 is brought into contact with the connecting frame 33, and the pressing roller support member 3 is also retracted. As a result, the roller 4 is retracted outward so that the opening cross section C of the rubber seal becomes circular. At this time, the coil springs 72 remain in an extended state and are always biased in a direction in which they are pressed against each other.
FIGS. 6 and 7 show a specific configuration of the states of FIGS. 5A and 5C. In FIG. 6, the right half of the closed state A in FIG. 5A is shown. The left half of the two-dot chain line Z, which is the opening center line, is a cross-sectional view of the center portion in the fully open opening state C of FIG. 5B. Similarly, in FIG. 7, the right half of FIG. In the closed state A of FIG. 5A, the left half is a plan view of the main part in the fully open open state C of FIG.
On the contrary, the closing process is the reverse process, and the closed state A is reached from the circular opening C and the diamond opening B.

Specifically, the angle of inclination of the "<" shape is 5 to 10 cm on one side (total opening diameter 10 to 20 cm) for each roller 41a, 41b length of about 40 cm (about 80 cm for a pair of rollers). The width of the concrete is appropriate, and the ready-mixed concrete containing gravel with a diameter of 5 cm or less is smoothly passed through and discharged. The distance until the rear end of the bearing frame 341 comes into contact with the connecting frame 33 is opened so that the entire opening is nearly circular. It is intended to regulate the degree of bending of the overall (elliptical) shape, and by adjusting this distance, it is appropriate (this optimum distance (width) varies depending on the composition of the ready-mixed concrete). Or (and / or) a semi-elliptical opening may be realized.
Further, in the normal stage in which the next gate is fully opened, the two rollers 41a and 41b are moved along with the retraction of the cylinder drive shaft 51 so that the opening cross section of the rubber seal 2 becomes a circular opening C (inner wall diameter of about 50 cm). Thus, the pressing roller support member 3 is retracted to the outside.

As described above, in the concrete hopper discharge gate of the embodiment, at the initial stage when the gate is in the half-open state, the arrangement of the two rollers is retreated with the shape of about “<” and the opening cross section of the rubber seal is in the aspect ratio As shown in FIG. 5 (b) and FIG. 9 of the prior art, the conventional gate cross section is a long and narrow opening having a large aspect ratio. On the other hand, gravel with a large diameter mixed in concrete (diameter 5 cm or less) or the like passes through and does not get caught in the diamond opening B, and as a result, the gravel is not clogged by the diamond opening C and the circular opening D. In addition, since the roller has a relatively simple structure that is divided into two parts, it can be made to have a robust structure, and can have a structure that is heavy like a concrete product and can withstand rough use. .
In this embodiment, the cover member 56 is provided at the connecting portion of the two rollers 41a and 41b, and the portion of the cover member 56 that contacts the rubber seal 2 is the contact surface that contacts the rubber seal of the two rollers. The pressure surface which is almost continuous is formed, and the rhombus is made closer to the elliptical opening, so that the passage of gravel and the like is made smoother.
Further, in this embodiment, even when compared with the prior art, the coil spring 72 that is contracted and urged is stretched around the spring locking portion 37 of the pressing roller support member 3, so that the spring is mounted on the cylinder drive shaft of the prior art. The cylinder drive shaft can be shortened and the overall width can be shortened as compared with the configuration in which the cylinder is provided. Furthermore, since the coil spring 72 is stretched over the spring locking portion 37 of the pressing roller support member 3 which is the outer peripheral side surface of the apparatus, the coil spring 72 can be easily replaced, and the setting and adjustment of the saddle pressure can be simplified. Maintenance is also easy.

  Of course, the present invention is not limited to the above-described embodiment as long as it does not detract from the characteristics of the present invention. If the opening area at the initial stage of opening is increased, two opposing pressing rollers (total The number of rollers is not limited to four), and may be six in total as disclosed in the prior art, or may be further increased. Moreover, you may use as a gate which mixes a liquid substance and a solid | solid thing except for the use for concrete.

It is a whole sectional view showing the closed state of the concrete hopper discharge gate of the example of the present invention. It is a top view of the principal part of FIG. It is a side view of the whole concrete hopper discharge gate of FIG. FIG. 4A is a partial cross-sectional view in which the pressure roller and the pressure roller support member are enlarged from above, and FIG. 4B is a partial side view thereof. The top view of the gate principal part explaining the operation state of the concrete hopper discharge gate of the Example of the present invention, The right half is a cross-sectional view of the center portion in the closed state A of FIG. 5A, and the left half is a fully open opening state C of FIG. 5C. The right half is a plan view of the main part in the closed state A in FIG. 5A, and the left half is in the fully open opening state C in FIG. 5C. Fig.8 (a) is sectional drawing which shows the closing state of the prior art concrete hopper discharge gate, FIG.8 (b) is the top view. FIG. 9A is a cross-sectional view showing a half-open state of a prior art concrete hopper discharge gate, and FIG. 9B is a cross-sectional view thereof. It is a top view which shows the fully open state of the hopper discharge gate for concrete of a prior art. FIG. 11A is a plan view showing a half-open state of a conventional concrete hopper discharge gate, and FIG. 11B is a cross-sectional view thereof.

Explanation of symbols

A: Opening in a closed state, B: Diamond opening (half opening),
C: Circular opening (full opening), Z: Center line of opening 1 ... Hopper, 11 ... Lower outlet, 12 ... Mounting band, 12 ... Fixed frame,
2 ... Rubber seal, 21 ... Abrasion resistant rubber, 22 ... Outer rubber, 23 ... Nylon hub,
3 ... Pressing roller support member, 31 ... Rotating shaft, 311 ... Link arm,
32 ... End frame, 33 ... Connection frame, 34 ... Bearing, 341 ... Bearing frame,
342 ... Fixing tool, 343 ... Bearing body, 344 ... Oiles bearing,
35a, 35b ... central bearing, 36 ... thrust bearing, 37 ... spring locking part,
371 ... Spring contraction force adjustment fixing member, 38 ... Turning pin,
4 ... roller, 41a, 41b, 41a ', 41b' ... pressure roller, 42a, 42b ... roller shaft,
45a, 45b ... spherical convex part,
5 ... Cylinder, 51 ... Cylinder drive shaft, 52 ... Cylinder mounting member,
53 ... Cylinder body, 54 ... Tip, 541a, 541b ... Bearing mounting part,
542 ... Center bearing frame, 55 ... Connecting member, 56 ... Cover member, 57 ... Upper end,
6 ... tip support member, 61 ... swing center shaft, 62 ... swing arm,
7 ... Reed pressure member, 72 ... Coil spring,

Claims (4)

  A cylindrical rubber seal is attached to the discharge port of the hopper, and a pressure roller support member composed of a plurality of rollers is disposed outside the rubber seal at a position facing the rubber seal, and the pressure roller support member is disposed on the cylinder. In a concrete discharge gate that presses the rubber seal by expansion and contraction and opens and closes the gate, a pair of cylinders that arrange the two rollers of the pressing roller support member into a linear shape and an approximately "<" shape are arranged. A supporting member for supporting the outer shaft of the opposing roller is provided, and the opposing supporting member is always urged in a direction in which they are pressed against each other by the pressing member, and the rubber seal is pressed to close the gate. When the two rollers are linearly clamped by the cylinder, the connecting portion of the two rollers is bent at the initial stage of opening to obtain approximately “ Shape arranged in concrete hoppers discharge gate in a normal stage of the gate fully opened, characterized in that the opening cross section of the rubber seal by the cylinder is retracted the rollers outwardly so that the circular ".   A bearing member for the roller is provided at a portion connecting the two rollers of the pressing roller support member located at the center of the support member of the roller. The hopper discharge gate for concrete according to claim 1, wherein the concrete hopper discharge gate is a pair of spherical bearing members that can be bent in a shape of a circle and rotate.   A cover member is provided on the bearing member so as to cover the bearing member, and a portion of the cover member that contacts the rubber seal forms a compression surface that is substantially continuous with a contact surface that contacts the rubber seal of the two rollers. The concrete hopper discharge gate according to claim 1, wherein the hopper discharge gate is for concrete.   The rocking support member for preventing bending in the vertical direction independent of the pressure roller support member is provided at a portion connecting the two rollers of the pressure roller support member. The hopper discharge gate for concrete according to 3.

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