JPH0654618U - Take-up device for endless chains for conveyors - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the load applied to the endless chain is different, it always biases the movable body appropriately in the direction in which the chain is tensioned. [Structure] A movable body 3 is provided with a rising portion 6, and a cylinder 8 is attached to a fixed frame 6 in a rearward direction at a rear portion thereof. Cylinder 8 piston rod 9
Is inserted into a through hole 10 formed in the rising portion 6 so as to be movable back and forth. A front stopper 11 and a rear stopper 12 are provided on the piston rod 9 at a predetermined interval from the rising portion 6 with respect to the rising portion 6 as a boundary. The first main flow passage 16 and the second main passage 16 branching back and forth from the oil sump 13 to the front communication port portion 14 and the rear communication port portion 15 of the cylinder 8.
The main flow path 17 is provided with throttle valves 18 and 19, and both main flow paths 1
Bypass passages 20 and 21 avoiding the throttle valves 18 and 19 are provided at 6 and 17, and check valves 22 and 23 that shut off the oil flow when the piston advances are provided at the bypass passages 20 and 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a take-up device for an endless chain for a conveyor.

[0002]

[Prior art]

 Conventionally, a chain wheel on which an endless chain is hung, a movable body to which the shaft of the chain wheel is attached, a fixed frame in which the movable body is movably arranged in the front-rear direction, and a movable body are chained. There is known a take-up device for an endless chain for a conveyor, which is provided with a biasing means that biases the belt in a direction in which it is strained.

[0003]

[Problems to be solved by the device]

 The conveyor is not always horizontal and may include at least one of a downhill section and an uphill section. When a large number of objects are transported by the driving force of the endless chain, when the objects reach such a sloped part, these loads are applied to the chain all at once, causing the conveyor to move In the urging means having the urging force intended only for the flat state, the chain is pulled in the direction in which the load is applied to cause slack. It is useless to apply an urging force to the urging means that predicts the condition that the conveyor is entirely inclined, and the chain, chain wheel, and other members are overwhelmed.

An object of the present invention is to constantly urge the movable body in a direction in which the chain is properly tensioned in the horizontal portion and the inclined portion of the conveyor, even if the loads applied to the endless chains are different as described above. An object of the present invention is to provide a take-up device for an endless chain for a conveyor.

[0005]

[Means for Solving the Problems]

 This invention is a chain wheel on which an endless chain is hung, a movable body to which a chain wheel shaft is attached, a fixed frame in which the movable body is arranged so as to be movable in the front-rear direction, In order to achieve the above object, in a take-up device for an endless chain for a conveyor, which comprises a biasing means for biasing the movable body in a direction in which the chain is strained, the movable body is provided with a rising portion. At the same time, the cylinder is mounted forward on the fixed frame, and its piston rod is inserted into the through hole opened in the rising part so that it can move back and forth. After that, a front stopper and a rear stopper are provided at predetermined intervals from the rising portion, and the cylinder is branched from the oil sump to the front and back. A throttle valve is provided in at least one of the first main flow path and the second main flow path leading to the communication opening and the rear communication opening, and the throttle valve is provided in the main flow path in which at least the throttle valve is present. The bypass flow passage is provided to avoid the above, and a check valve for shutting off the oil flow during piston forward movement is provided in the bypass flow passage.

[0006]

[Action]

 In the take-up device for an endless chain for a conveyor according to the present invention, a movable body is provided with a rising portion, a cylinder is mounted forward on a fixed frame behind the movable body, and a piston rod is formed in a through hole formed in the rising portion. It is inserted so that it can be moved forward and backward, and the piston and rod are provided with front and rear stoppers with a predetermined interval from the front and rear of the rising part as a boundary, respectively. A throttle valve is provided in at least one of the first main flow path and the second main flow path leading to the front communication opening part and the rear communication opening part, and the throttle valve is provided in at least one of the main flow paths where the throttle valve exists. A bypass flow path is provided that avoids the valve, and a check valve that shuts off the oil flow when the piston advances is installed in the bypass flow path. · If suddenly larger load than usual applied to the chain, the movable member is moved to the front. Then, the rising part comes into contact with the front stopper of the piston rod and pulls it, so that it tries to move the piston forward, but the flow rate is controlled by the throttle valve of the main flow path, and the reverse flow is prevented in the bypass flow path. Since the valve is working, the resistance of the oil in the cylinder is received, and in addition to the usual biasing means, the force that biases the movable body in the direction in which the chain is strained acts. When the load applied to the endless chain returns to the normal state, the movable body is pulled back by the force of the normal biasing means. Then, the rising portion comes into contact with the rear stopper of the piston rod and pulls it, so that the piston moves backward. At this time, since the check valve in the bypass passage is not working, the oil smoothly flows between the oil sump and the cylinder, and the piston quickly returns to the original position.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In this specification, the front means the left direction in FIGS. 1 to 3, and the rear means the right direction in the drawings.

The take-up device for the driving endless chain of the floor-type double-acting conveyor shown in FIG. 1 is a chain wheel (2) with an endless chain (1) and a vertical chain wheel (2). The square movable body (3) with the upper end of the shaft attached, the rectangular fixed frame (4) on which the movable body (3) is movably arranged in the front-rear direction, and the movable body (3) are chained. Is equipped with a counter weight (5) that urges the user in a direction that makes him nervous. A rising part (6) is provided at the rear edge of the movable body (3), and a cylinder (8) is attached to the front side of a crosspiece (7) provided near the rear end of the fixed frame (4) behind it. The piston rod (9) is inserted into the through hole (10) formed in the rising portion (6) so as to be movable back and forth, and the piston rod (9) is separated by the rising portion (6). A disk-shaped front stopper (11) and a disk-shaped rear stopper (12) are provided at predetermined intervals before and after the rising portion (6), and the cylinder (8) branches from the oil sump (13) to the front and rear. The first main flow path (16) and the second main flow path (17) leading to the front communication port part (14) and the rear communication port part (15) are provided with throttle valves (18) and (19) Bypass passages (20) and (21) that avoid throttle valves (18) and (19) are provided in the passages (16) and (17), and the oil flow when the piston moves forward in the bypass passages (20) (21) Check valves (22) and (23) for shutting off are provided.

The suspension rope (24) of the counterweight (5) is located above the rear sheave (26) at the top of the portal (25) at the rear end of the fixed frame (4). To the underside of the front pulley (27) provided on the cross rail (7) and is fixed to the rear part of the movable body (3). As shown in Fig. 1, when the rising part (6) is in the middle of the front stopper (11) and the rear stopper (12), it is in the neutral state, and the transported object moves only in the horizontal part of the conveyor. While the counter weight (5) is being urged, the piston rod (9) is slightly retracted, but the rising portion (6) is located between the front stopper (11) and the rear stopper (12). In either position.

FIG. 2 shows a state in which the transferred object is approaching a slope and a load larger than usual is suddenly applied to the endless chain (1), and the movable body (3) is moved forward. When the movable body (3) moves in this way, the rising portion (6) contacts the front stopper (11) of the piston rod (9) and pulls it, so that the piston (28) tries to move forward, The flow rate is controlled by the throttle valves (18) (19) of the first and second main flow paths (16) (17), and the check valves (22) ( 23) is working, the resistance of the oil (O) in the cylinder (8) causes the chain (1) to be tensioned by the movable body (3) in addition to the biasing force of the counter weight (5). A force that urges in the direction works.

FIG. 3 shows a state in which the load applied to the endless chain (1) returns to a normal state and the movable body (3) is pulled back by the counter weight (5). When the movable body (3) moves backward, the rising portion (6) contacts the rear stopper (12) of the piston rod (9) and pulls it, so that the piston (28) moves backward. At this time, the check valves (22) and (23) of both bypass passages (20) and (21) are not working, so the oil flows smoothly between the oil sump (13) and the cylinder (8), and the piston (28) quickly returns to its original position.

In the above embodiment, the throttle valves (18) and (19) are provided in both the main flow paths (16) and (17), but only one of them may be provided, and both the main flow paths (16) ( 17) Both have bypass flow passages (20) (21) with check valves (22) (23), but the throttle valve is either one of both flow passages (16) (17) as described above. In the case of one side, it is sufficient to provide a bypass flow path avoiding the throttle valve in the main flow path in which the throttle valve exists, and provide a check valve in the bypass flow path to shut off the oil flow when the piston advances.

[0014]

[Effect of device]

 According to the take-up device for an endless chain for a conveyor of the present invention, even if the load applied to the endless chain is different between the horizontal part and the slope part of the conveyor, the movable body is properly tensioned by the chain in both cases. It can be urged in the urging direction.

[Brief description of drawings]

FIG. 1 is a perspective view of a take-up device for an endless chain for a conveyor according to the present invention.

FIG. 2 is a vertical sectional view showing an operating state of the take-up device when a load larger than usual is applied to the endless chain.

FIG. 3 is a vertical cross-sectional view showing an operating state of the take-up device when a load larger than usual applied to the endless chain is removed.

[Explanation of symbols]

 (1): Endless chain (2): Chain wheel (3): Movable body (4): Fixed frame (5): Counter weight (biasing means) (6): Rise (8): Cylinder ( 9): Piston rod (10): Through hole (11): Front stopper (12): Rear stopper (13): Oil sump (14): Front communication port (15): Rear communication port (16): 1st Main flow path (17): Second main flow path (18) (19): Throttle valve (20) (21): Detour flow path (22) (23): Check valve

Claims (1)

[Scope of utility model registration request] 1. A chain wheel on which an endless chain is hung, a movable body to which a shaft of the chain wheel is attached, a fixed frame in which the movable body is movably arranged in the front-rear direction, and a movable body. In a take-up device for an endless chain for a conveyor, which comprises a biasing means for biasing a body in a direction in which the chain is strained, a movable body is provided with a rising portion, and a cylinder is forwardly directed to a fixed frame behind the rising portion. The piston rod is inserted into the through hole opened in the rising part so that it can move back and forth, and the piston rod has a predetermined interval from the rising part before and after the rising part as a boundary. A stopper and a rear stopper are provided,
A throttle valve is provided in at least one of the first main flow path and the second main flow path branching from the oil sump to the front and rear communication ports of the cylinder, and at least the throttle of both main flow channels. An endless chain for a conveyor, characterized in that a bypass flow path that avoids a throttle valve is provided in the main flow path where the valve exists, and a check valve that cuts off the oil flow when the piston advances is provided in the bypass flow path. Take-up device.