JP4261858B2 - Discharge gate device for ready-mixed concrete - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a discharge gate device that discharges ready-mixed concrete from a concrete hopper of a concrete plant that manufactures ready-mixed concrete.
[0002]
[Prior art]
In a concrete plant that manufactures ready-mixed concrete, weigh predetermined amounts of gravel, sand, cement, water and admixture according to the mix of ready-mixed concrete to be manufactured, and sequentially put these measured materials into a mixer and knead them for a predetermined time. To produce ready-mixed concrete. And when kneading is completed, the ready-mixed concrete is once dropped into a concrete hopper disposed below the mixer, and then the discharge gate attached to the lower part of the concrete hopper is opened and loaded on the mixer truck waiting under the discharge gate. .
[0003]
An example of a conventional discharge gate device is shown in FIG. The discharge gate includes a cylindrical gate rubber 1 made of a flexible material, and a pair of rollers 2 sandwiched from both sides are provided as pressing members to open and close the opening. The roller 2 is rotatably attached to the lower end of an arm 5 that is rotatably attached to a support member 4 by a shaft body 9. Then, the tip of the piston rod 10 of the cylinder 7 attached to the bracket member 6 fixed to the support member 4 is attached to the lower end of the arm 5, the arm 5 is rotated by the expansion and contraction of the piston rod 10, and the roller 2 is advanced. The gate rubber 1 is retracted to be clamped from both sides, and the clamping is released. (For example, see Patent Document 1)
[0004]
When the discharge gate is opened, the gate rubber 1 is sandwiched between the rollers 2, and the cylindrical gate rubber 1 is deformed and crushed and closed. Is released by restoring the original cylindrical shape of the gate rubber 1 that is crushed by being held by the roller 2 due to the elastic restoring force of the gate rubber 2 that is a flexible material. It was open.
[0005]
[Patent Document 1]
Japanese Patent No. 2608809 (page 2-3, Fig. 1)
[0006]
[Problems to be solved by the invention]
However, when the gate is closed, the gate rubber 1 is closed while being pressed by the roller 2, so that the roller 2 forcibly moves and holds the gate rubber 1 by the advance of the roller 2. Even if 2 moves backward, the gate rubber 1 does not move integrally with the roller 2, and the gate rubber 1 is opened only by a restoring force for returning to the original shape of the gate rubber 1 itself.
For this reason, even if the roller 2 is in a state where it is not held apart, the elastic restoring force of the gate rubber 1 itself is weakened due to deterioration of the rubber material of the gate rubber 1 due to sunlight or bending due to repeated deformation. Since 1 cannot be easily restored to the original cylindrical shape in a short time, the gate rubber 1 does not open in accordance with the movement of the roller 2.
Wear of the gate rubber 1 due to friction between the pressing member and the gate rubber 1 generated when the gate rubber 1 is held is prevented by rotating the roller 2, so that the roller 2 as the pressing member and the gate rubber 1 are fixed and integrated. It can not be.
[0007]
Further, in order to increase the restoring force of the gate rubber 1 so that the gate rubber 1 is opened quickly, if a hard rubber material is used by lowering the elasticity of the material of the gate rubber 1, the gate rubber 1 is strong for deformation when it is closed. Holding power is required. If the pinching force is weak, sufficient deformation cannot be obtained, so that it cannot be blocked by pinching, and material leakage occurs from the gate.
[0008]
Accordingly, an object of the present invention is to match the opening degree of the gate rubber with the movement of the pressing member when the gate rubber is opened.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a cylindrical gate rubber having flexibility in a discharge gate device that discharges raw concrete by deformation of a gate rubber made of a flexible material provided in a concrete hopper, A pair of moving means comprising a pair of pressing members for sandwiching the gate rubber from both sides in the horizontal direction and deforming the gate rubber; and a driving member for supporting and moving the pressing member to sandwich the gate rubber; It is characterized by comprising restoring force assisting means for pushing the gate rubber deformed by the pressing member in the shape returning direction when the holding is released and returning to the original cylindrical shape, thereby promoting the restoring force of the gate rubber.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a side view of the discharge gate apparatus of the present invention. FIG. 2 is a cross-sectional view taken along arrow A in FIG. 2A shows a state where the gate is closed, and FIG. 2B shows a state where the gate is opened.
In FIG. 1, the discharge gate device includes a cylindrical gate rubber 1 made of a flexible material, and a pair of rollers 2 sandwiched from both sides are disposed as pressing members in order to open and close the opening.
A concrete hopper 18 provided with a discharge gate device is provided with a support member 4, and an arm 5 is attached to the support member 4 so as to be rotatable by a shaft 9. A roller 2 is rotatably attached to the lower end of the arm 5. A bracket member 6 is fixed to the support member 4, and the tip of the piston rod 10 of the cylinder 7 attached to the bracket member 6 is attached to the lower end portion of the arm 5.
[0011]
The support member 4, the shaft body 9, the arm 5, the bracket member 6, the cylinder 7, and the piston rod 10 are provided as a driving member 3 that supports and moves the roller 2 that is a pressing member, and the pressing member 2 and the driving member 3 are The gate rubber 1 is held as the moving member 8.
The arm 5 is rotated by the expansion and contraction of the piston rod 10 of the cylinder 7, and the roller 2 is moved forward and backward to clamp the gate rubber 1 from both sides and release the clamping.
Two strips 11 are wound around the gate rubber 1 as restoring force assisting means. Both ends of the belt body 11 are fixed to the end portions on the same side of a pair of opposing arms 5 as the moving means 8, and as shown in FIG. 6, one belt body 11a is different from the other belt bodies 11b. The arm 5 on the opposite side is fixed to the end on the same side .
[0012]
The operation of the embodiment of the present invention will be described.
Since the gate shown in FIG. 2A is changed from the closed state shown in FIG. 2A to the state where the gate shown in FIG. 2B is opened, the roller 2 moves in the pressing release direction in which the cylinder 7 is shortened and the arm 5 is retracted. Is no longer held. Since the two strips 11 are wound around the gate rubber 1 and fixed to the end of the opposite side of the arm 5, the arm 5 is retracted by the shortening of the cylinder 7 and pulled to the left and right in the pressing release direction. Then, the side surface wound around the gate rubber 1 is pressed in the shape return direction orthogonal to the pressing release direction. Since the two strips 11 are respectively wound around the gate rubber 1 from one end side of the arm 5, both sides of the gate rubber 1 in the shape return direction are pressed. Since the side surfaces of the gate rubber 1 pressed by the belt 11 are both ends of the shape that has been straightened by the deformation of the gate rubber 1, the crushed and deformed gate rubber 1 is released from the nipping state. A pressing force is applied by the band 11 in the shape return direction, which is the direction to return to the original cylindrical shape.
[0013]
Therefore, the belt 11 wound around the gate rubber 1 is released from the holding state by using the driving force of the moving member 8 that moves the pressing member 2 due to the shortening of the cylinder 7, and returns to the original cylindrical shape. Applying a force in the shape return direction to help the restoring force to return to the original shape of the gate rubber 1 itself.
In accordance with the amount of movement of the pressing member 2, the amount by which the band 11 is pulled in the pressing release direction changes. If the pressing member 2 moves a little, the band 11 is also pulled only a little. Since the band 11 presses the gate rubber 1 in the shape return direction in proportion to the amount by which the band 11 is pulled in the pressing release direction, the opening degree of the gate rubber 1 is changed. Therefore, the opening degree of the gate rubber 1 can be changed according to the movement amount of the pressing member 2.
[0014]
In the said Example, although the strip | belt body 11 is provided in one place, in order to further promote the restoring force of the gate rubber 1, the same strip | belt body 11 is provided in multiple places in the up-down direction. The restoring force of the gate rubber 1 is not promoted only at the place where the belt body 11 is wound, but the restoration to the original cylindrical shape is promoted in the entire vertical direction of the gate rubber 1, and the opening of the gate rubber 1 can be secured more effectively. . In order to provide the plurality of strips 11 in the vertical direction, a fastener for holding the strips 11 is provided to prevent the strips 11 from slipping up and down.
[0015]
As another embodiment using the band 11 as the restoring force assisting means 12, as shown in FIG. 3, only one band 11 is used. By winding one band 11 around the gate rubber 1 and fixing both ends of the band 11 to opposite ends of the pair of opposing arms 5, the same operation as described above can be obtained with a simple configuration.
Further, as an embodiment of the restoring force assisting means 12 other than the belt body 11, as shown in FIG. 4, a receiving member 13 is provided at the end of the opposite arm 5 on the same side , and the receiving member 13 is rotated by a pin 14. A link member 15 that is movably attached is provided, and the two link members 15 provided at the end portions on the same side of the pair of opposing arms 5 and the pair of arms 5 are separated from each other by the link mechanism. A correction member 16 that moves in the shape return direction and presses the gate rubber 1 is rotatably attached by a support shaft 17. The link member 15 moves the correction member 16 attached to the support shaft portion in the shape restoring direction by the link mechanism when the pair of arms 5 are separated from each other in the pressing release direction. The correction member 16 presses the gate rubber 1 in the shape restoring direction, and the gate rubber 1 is corrected to the original cylindrical shape, thereby assisting the restoring force of the gate rubber 1.
[0016]
In the example using the belt 11 as the restoring force assisting means 12, the belt 11 is wound around the entire circumference of the gate rubber 1 to promote the cylindrical restoring force of the entire gate rubber 1, but in the example using the correction member 16. The pressing force is applied only in the shape restoring direction of the gate rubber 1, and the restoring force of the cylindrical shape of the gate rubber 1 is locally promoted, and the restoring force is weakened due to the severe deterioration of the rubber. It is more effective in the gate rubber 1 that requires
[0017]
【The invention's effect】
As described above, according to the present invention, when the pressing member moves to release the holding of the gate rubber, the restoring force assisting means promotes the restoring force to return to the original cylindrical shape of the gate rubber, and the shape of the gate rubber Is promoted and the opening of the gate rubber is secured, so that the concrete can be discharged from the hopper in a short time.
In addition, by adjusting the opening degree of the gate rubber to the amount of movement of the pressing member without fixing the pressing member and the gate rubber, the opening degree of the gate rubber is changed in accordance with the slump value of the ready-mixed concrete to be discharged to the slump value of the ready-mixed concrete. It can be discharged in the shortest possible time.
Furthermore, a sufficient opening of the gate rubber can be ensured with a simple structure using the driving force of the moving means without deforming the shape of the gate rubber using a separate large-scale device with a drive source.
[Brief description of the drawings]
FIG. 1 shows a side view of a discharge gate device of the present invention.
FIG. 2 is a cross-sectional view taken along arrow A in FIG.
FIG. 3 shows another embodiment of the discharge gate device of the present invention.
FIG. 4 shows another embodiment of the discharge gate device of the present invention.
FIG. 5 shows a side view of a conventional discharge gate device.
FIG. 6 shows a winding state diagram of a band according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gate rubber 2 Press member 3 Drive member 5 Arm 7 Cylinder 8 Moving means 11 Band 16 Correction member

Claims (4)

In the discharge gate device that discharges ready-mixed concrete by deformation of the gate rubber made of a flexible material provided in the concrete hopper,
A cylindrical gate rubber having flexibility; and
A pair of moving means comprised of a pair of pressing members for deforming the gate rubber by sandwiching the gate rubber from both sides in the horizontal direction and a driving member for supporting and moving the pressing member to sandwich the gate rubber;
A restoring force assisting means for promoting the restoring force of the gate rubber by pressing the gate rubber deformed by the pressing member in the shape restoration direction when the nipping of the gate rubber is released and the original cylindrical shape is restored ;
The restoring force assisting means is composed of a belt wound around a gate rubber,
One end of the band is fixed to one end of the pair of pressing members in the shape return direction of the one pressing member, and the other end of the pair of pressing members is opposed to the other pressing member. A discharge gate device for ready-mixed concrete, which is fixed to the other end portion in the return direction . In the discharge gate device that discharges ready-mixed concrete by deformation of the gate rubber made of a flexible material provided in the concrete hopper,
A cylindrical gate rubber having flexibility; and
A pair of moving means comprised of a pair of pressing members for deforming the gate rubber by sandwiching the gate rubber from both sides in the horizontal direction and a driving member for supporting and moving the pressing member to sandwich the gate rubber;
A restoring force assisting means for promoting the restoring force of the gate rubber by pressing the gate rubber deformed by the pressing member in the shape restoration direction when the nipping of the gate rubber is released and the original cylindrical shape is restored;
The restoring force assisting means is composed of two bands wound around the gate rubber,
Both ends of one of the two bands are fixed to one end in the shape return direction of the pair of pressing members, respectively, and both ends of the other band are the other side in the shape return direction of the pair of pressing members A discharge gate device for ready-mixed concrete, which is fixed to each end . The discharge gate device for ready-mixed concrete according to claim 1 or 2, wherein the restoring force assisting means is provided at a plurality of locations in the vertical direction of the gate rubber . In the discharge gate device that discharges ready-mixed concrete by deformation of the gate rubber made of a flexible material provided in the concrete hopper,
A cylindrical gate rubber having flexibility; and
A pair of moving means comprised of a pair of pressing members for deforming the gate rubber by sandwiching the gate rubber from both sides in the horizontal direction and a driving member for supporting and moving the pressing member to sandwich the gate rubber;
A restoring force assisting means for promoting the restoring force of the gate rubber by pressing the gate rubber deformed by the pressing member in the shape restoration direction when the nipping of the gate rubber is released and the original cylindrical shape is restored;
The restoring force assisting means is
The gate rubber is pushed in the shape return direction by being pivotally supported by two link members rotatably provided at the end portions on the same side of the pair of opposed moving means and moving in a direction perpendicular to the moving direction of the moving means. A discharge gate device for ready- mixed concrete, comprising a straightening member that performs the correction .

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