JP2001122422A - Truck and carrier device driven by screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carrier device smooth and quiet at a high speed and high in stop accuracy and to provide a carrier facility constituted of a plurality of trucks and capable of performing carrying and stopping among many manufacturing processes at the high speed and with high accuracy. SOLUTION: This carrier device is one having a truck 3 constituted by mounting a screw roller part 1 having a front roller and a rear roller, a screw 2 for gradually changing pitch a blade and an insertion mechanism. This carrier facility is constituted of the carrier device constituted of a plurality of truck 3, a plurality of screws 2 and a plurality of insertion mechanisms, a rail of a closed loop for linking them and the so-called power and free chain conveyor. A range driven by the insertion mechanisms and the screw 2 is characterized by releasing from the chain conveyor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport vehicle in a factory, and more particularly, to a transport device combining a screw vehicle with a truck having a screw roller, a plurality of trucks and a plurality of the transport devices (excluding the truck). The present invention relates to a transport facility that is configured to achieve an effect of being capable of performing transport with high speed, smoothness, quietness, and high stopping accuracy by using a transport facility in combination with a chain conveyor.

[0002]

2. Description of the Related Art Conventional transport vehicles include a vehicle that travels by thrust such as a ball screw, pneumatic, hydraulic, or electric cylinder, a vehicle that has its own power such as an engine or a motor, and a vehicle that travels on its own. There are those that connect and push or tow all together, and those that pull a truck with a carriage with a chain with a dog and run a so-called power and free truck.

A bogie that travels by a thrust such as a ball screw, pneumatic, hydraulic, or electric cylinder is used for reciprocating a relatively short distance, and is not suitable for long-distance running. Unless pressed, multiple carts could not be driven in a certain direction. On the other hand, in the case where the truck itself has power such as an engine or a motor and travels on its own, the truck itself needs to hold the power and control equipment, so that the truck has an excessively heavy and complex structure, and the truck 1 The cost per unit was also expensive. Further, there is a problem that equipment and work for supplying fuel to the engine and supplying electric power to the motor or the battery are required.

[0004] In addition, those which connect and push or pull the carts collectively have a large inertia, so that a large driving power is required and the time required for starting and stopping is long. Therefore, it is suitable when traveling at a constant speed, but not when starting and stopping are repeated. Also, what drives a so-called power and free trolley is tow a trolley with a carriage by a chain conveyor with a dog, and the trolley can be stopped at any place, but stop precision is required. In such a case, a separate positioning device was required. In addition, there is a problem in that the traveling speed of the chain is limited, and the truck cannot travel at high speed, and the noise increases.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a transport device in which a carriage having a screw roller portion and a screw are combined. Accordingly, it is an object of the present invention to provide a transfer device that is fast, smooth, quiet, and has a high stopping accuracy. Another object of the present invention is to provide a transport facility that can perform transport and stop between many manufacturing processes at high speed and with high accuracy by using a transport facility in which a plurality of trolleys, a screw, and a chain conveyor are combined. It is in.

Another object of the present invention is to provide a bogie suitable for long-distance running or running of a plurality of bogies, except for the drawbacks of bogies running by thrust such as ball screws, pneumatic, hydraulic and electric cylinders. It is in. Another purpose is
An object of the present invention is to provide a small-sized, light-weight, simple-structured trolley, which is inexpensive and easy for maintenance work, except for the drawbacks of the trolley itself having an engine, a motor, or the like and having the motive power run by itself.

[0007] Another object of the present invention is to independently drive small-inertia trolleys with a small power, excluding the drawbacks of the trolleys for connecting and pushing or pulling the trolleys together. The object of the present invention is to provide a trolley suitable for repeating the above. Still another object is to provide a high-speed, noise-free transport trolley that eliminates the drawbacks of a trolley that travels in a so-called power-and-free manner and has a structure that has a high stopping accuracy and eliminates the need for a positioning device. is there.

[0008]

A screw roller portion having a front roller and a rear roller, wherein a slidable rear roller is pressed against a front roller by a spring; And a screw having an insertion position and a removal position of the dolly and having a stop position in the middle thereof, wherein the pitch of the blades starts to move from the insertion position or the stop position. The screw is characterized in that the pitch is gradually increased before reaching the maximum pitch, and before stopping at the stop position or the escape position, the blade pitch is gradually reduced. The outer diameter of the roller is made slightly smaller than the space of the blade at the screw insertion position, and the bogie is pushed by a cylinder, etc. Things become against the side surface of the blade of the screw insertion position, a transport device having an insertion mechanism.

It has a plurality of trucks, a plurality of screws, an insertion mechanism, and a closed loop rail, and runs a chain conveyor with a dog along the rails. A carriage is mounted on each of the trucks. Pushing the carriage hook causes the truck to travel. Further, when the carriage roller of the carriage is lifted, the carriage hook is also lifted so that it is not pushed by the dog of the chain conveyor, and in a range where the carriage is pushed by a cylinder or the like in the insertion mechanism or a range driven by the screw, the carriage at the position is not moved. The transport equipment is configured to lift the carriage roller.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The screw roller portion 1 according to the present invention has a front roller 11 and a rear roller 12. The front roller 11 is larger than the rear roller 12 and slightly smaller than the blade space 26 at the insertion position 22 of the screw 2. It has a diameter and a crowning shape. What is referred to as a crowning shape is a shape in which the outer peripheral surface is formed of a middle-high curve. The reason for the crowning shape is that the blade 21 of the screw 2 is
This is because the front roller 11 does not interfere with the adjacent blade 21 when it is not at right angles to the axis or when deformation occurs. The front roller 11 is rotatably mounted on a shaft 13 fixed to a base 19, and its outer peripheral surface is made of polyurethane. On the other hand, the rear roller 12 has a smaller outer diameter than the front roller 11 and has a cylindrical shape, and the rear roller 12 is rotatably mounted on a shaft 14 fixed to a bracket 16. The bracket 16 is slidably attached to a shaft 18 fixed to a base 19, and is pressed against the front roller 11 by a spring 17 made of a wire having a rectangular cross section. The outer periphery of the roller 12 is made of polyurethane and a material having a slightly lower hardness than that used for the outer periphery of the front roller 11.

The carriage 3 has a carriage frame 31, a screw roller section 1, a plurality of traveling wheels 32, and a guide roller 33. The screw roller unit 1 is joined to the bogie frame 31 via the mounting surface 19a, and the blades 21 of the screw 2 are installed in a positional relationship between the front roller 11 and the rear roller 12. The running wheel 32 rolls on the rail 24 and the guide roller rolls on the rail 24 side. A carriage 34 is attached to the lower surface of the carriage frame 31.
A carriage link 37 is mounted on the front upper portion of the carriage 34 so as to be able to swing up and down, and a carriage roller 36 is rotatably mounted on the front of the carriage link 37. A carriage hook 38 is attached to the front lower portion of the carriage so as to link with the vertical swing of the carriage link 37 and swing vertically. On the other hand, an inclined plate 39 is attached to the upper rear part of the carriage 34,
When the subsequent truck 3 approaches, the carriage roller 36 of the subsequent truck rides on the inclined plate 39 of the truck and lifts the carriage link 37 of the subsequent truck.

The screw 2 is driven by a motor with a brake (not shown), has a function of rotating in a fixed direction or both directions, and stopping. The screw 2 has an insertion position 22 and an escape position 23 of the carriage 3, and one or more stops are provided on the way. It may have a location 44. The pitch 25 of the blades is
At the part where the movement starts from the stop position 44 or the like, the pitch is set to a small pitch, gradually increased to reach the maximum pitch, and further reduced gradually at the part before reaching the stop position 44 or the escape position 23. When a plurality of bogies are conveyed simultaneously and between different distances by one screw, the number of blades 21 between the conveyed distances is set to be the same.

A transport facility 5 comprising a plurality of trolleys 3 as described above and four screws 2a, 2b, 2c, 2d, wherein cylinders 46a, 4
6b, 46c, 46d are arranged, and the standby positions 42a, 42
b, 42c, and 42d, the front roller 11 of the screw roller unit 1 is pushed to insert the respective screw insertion positions 22a, 22b, 22c, and 22d into the side surfaces 21a of the blades.
To have the function of pushing. Screw 2a has two stop positions 44a and 44b, screw 2b has two stop positions 44c and 44d, screw 2c has three stop positions 44e, 44f and 44g, and screw 2d has two stop positions. Stop positions 44h and 44i are provided, respectively.

The rail 24 is a closed loop, and the chain conveyor 4 having the dog 41 runs along the traveling center of the carriage 3. When the carriage roller 36 is at the lower position, the dog 41 pushes the carriage hook 38 of the carriage 34. When the carriage roller 36 is lifted, the carriage link 37 swings upward to lift the carriage hook 38, and the dog 41 Hook 3
It is assumed that 8 is not pressed. Further, from the stand-by positions 42a, 42b, 42c, 42d of the carriage 3, the carriages 3 are moved from the cylinders 46a, 46b, 46c, 46d to the respective screws 2a.
A carriage rail (not shown) is attached to a range where the carriage roller 36 is pushed and moved by a, 2b, 2c, and 2d, and the carriage roller 36 is lifted. In addition, a stopper (not shown) is provided at the standby position 42e, and has a function of temporarily stopping the carriage 3 by lifting the carriage roller 36.

The present invention is configured as described above,
Hereinafter, the operation will be described. The trolley 3 is pushed by the dog 41 of the chain conveyor 4 on the rail 24 having a closed loop shape, and travels sequentially in the clockwise direction in plan view. When reaching the standby position 42a, 42b, 42c, 42d, the carriage roller 36 of the carriage 3 is lifted by the carriage rail, so that the carriage link 37 swings upward and the carriage hook 38 is lifted. The trolley 3 stops after moving away from the dog 41 of FIG. The standby position 42a is a work loading position, and loads the work while the carriage 3 is stopped at the standby position 42a. The cart 3 at the standby position 42a
After the work is loaded, while the screw 2a is stopped, the bogie 3 at the standby position 42b, 42c, 42d pushes the cylinders 46a, 46b, 46c, 46d respectively while the screw 2b, 2c, 2d is stopped. Insertion position 22
a, 22b, 22c, 22d, and stops while the front roller 11 of the screw roller unit 1 is pressed against the side surface 21a of the blade at the insertion position.

In this state, the screws 2a, 2b, 2c, 2
When d is rotated, the tip 21b of each blade 21 enters between the front roller 11 and the rear roller 12 of each screw roller unit 1, and sandwiches the blade 21 between the front roller 11 and the rear roller 12. Therefore, the screws 2a, 2b, 2c, 2
The bogie 3 moves forward with the rotation of d, and the screws 2a, 2
When the bogie 3 stops after rotating b, 2c, and 2d, the bogies 3 stop at 44a, 44b, 44c, 44d, 44, respectively.
e, stop at 44f, 44g, 44h, 44i. Stop positions 44a, 44b, 44c, 44d, 44e, 44
In steps f, 44g, 44h, and 44i, operations of separate steps for processing a work are performed. When the carriage 3 reaches the escape position 23 of each screw 2a, 2b, 2c, 2d, the screw roller unit 1 separates from the screws 2a, 2b, 2c, 2d.

The screw roller portion 1 of the carriage 3 is a screw 2
a, 2b, 2c, and 2d, the carriage roller 36 separates from the carriage rail, and the carriage link 3
7 swings downward and the carriage hook 38 lowers,
The dog 41 of the chain conveyor 4 is the carriage hook 38
, And the carriage 3 moves forward by being pulled by the chain conveyor 4. When the carriage 3 reaches the standby position 42e through all the work processes, the carriage roller 36 is lifted by a stopper (not shown), so that the carriage link 37 swings upward and the carriage hook 38 is lifted. Therefore, the carriage hook 38 is separated from the dog 41 of the chain conveyor 4 and the carriage 3 stops. The standby position 42e is a work carry-out position, and the work is carried out while the carriage 3 is stopped at this position. When the stopper (not shown) is lowered after the work is carried out, the roller 36 is lowered, and the carriage link 37 swings downward and the carriage hook 38 is lowered, so that the dog 41 of the chain conveyor 4 pushes the carriage hook 38,
The carriage 3 moves forward by being pulled by the chain conveyor 1. Thereafter, the carriage 3 reaches the standby position 42a, receives a new work, and repeats the above steps.

In this embodiment, the roller is made of polyurethane, but MC nylon (monomer casting nylon) or Duracon (polyacetal) is used.
May be used. Further, in this embodiment, a screw in which a plate-like blade is attached to a cylindrical body is used,
It may be a screw having a groove in a cylindrical body, in which a portion corresponding to the blade is large and a portion of the groove which is a space of the blade is small.

[0019]

According to the present invention, a transport device in which a bogie having a screw roller portion and a screw are combined can provide a transport device that is high-speed, smooth, quiet, and has high stopping accuracy. When sent by a normal chain conveyor, noise is loud and can be sent only at a maximum speed of 30 to 40 m / min.
It could be sent at a speed of 60 m / min. In particular, by gradually changing the pitch of the blades, it is possible to smoothly start up at the time of rotation and decelerate at the time of stop at the same rotation speed, and it is possible to position the bogie only by stopping the screw with high stop accuracy. This eliminates the need for a positioning device that was conventionally required. In addition, a transport device capable of simultaneously transporting a plurality of manufacturing processes at different distances can be provided.

In addition, except for the drawbacks of a bogie that travels by thrust such as a ball screw, pneumatic, hydraulic or electric cylinder,
It was possible to provide a bogie suitable for long-distance running or running a plurality of bogies simultaneously. Except for the drawbacks of trucks that have their own power, such as an engine or motor, and run on their own, it is possible to provide a truck that is small, light, and simple in structure, inexpensive, and easy to maintain. did it.

Except for the drawbacks of the bogies that connect and push or tow the bogies together, the bogies with low inertia can be driven individually with small power, and start and stop are frequently repeated. A suitable trolley could be provided for the case. Furthermore, except for the drawbacks of a truck that travels in a so-called power-and-free manner, it is possible to provide a high-speed, low-noise transport truck that does not require a positioning device by using a transport mechanism with high stopping accuracy.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a screw roller section.

FIG. 2 is a front view of one embodiment of the bogie.

FIG. 3 is a side view showing an embodiment of a carriage attached to a cart.

FIG. 4 is an explanatory view of one embodiment of a screw.

FIG. 5 is a layout diagram of one embodiment of the transport equipment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Screw roller part 2 ... Screw 2a ... Screw 2b ... Screw 2c ... Screw 2d ... Screw 3 ... Cart 4 ... Chain conveyor 5 ... Transport equipment 11・ ・ ・ Front roller 12 ・ ・ ・ rear roller 13 ・ ・ ・ shaft 14 ・ ・ ・ shaft 16 ・ ・ ・ bracket 17 ・ ・ ・ spring 18 ・ ・ ・ shaft 19 ・ ・ ・ base 19a ・ ・ ・ mounting surface 21 ・ ・· Blade 21a ··· Side surface of blade 21b ··· Tip of blade 22 ··· Insert position 22a ··· Insert position 22b ··· Insert position 22c ··· Insert position 22d ··· Insert position 23 ··· Escape position 24 ・ ・ ・ Rail 25 ・ ・ ・ Blade pitch 26 ・ ・ ・ Blade space 31 ・ ・ ・ Cart frame 32 ・ ・ ・ Running wheel 33 ・ ・ ・ Guide roller 34 .. Carriage 36 ・ ・ ・ Carriage roller 37 ・ ・ ・ Carriage link 38 ・ ・ ・ Carriage hook 39 ・ ・ ・ Inclined plate 41 ・ ・ ・ Dog 42a ・ ・ ・ Standby position 42b ・ ・ ・ Standby position 42c ・ ・ ・ Standby position 42d ··· Standby position 42e ··· Standby position 44 ··· Stop position 44a ··· Stop position 44b ··· Stop position 44c ··· Stop position 44d ··· Stop position 44e ··· Stop position 44f · .. Stop position 44g Stop position 44h Stop position 44i Stop position 46a Cylinder 46b Cylinder 46c Cylinder 46d Cylinder

Claims (6)

[Claims] 1. A screw roller portion having a front roller and a rear roller, wherein the front roller has a larger outer diameter than the rear roller, has a crowning shape, and has a shaft fixed to a base. The rear roller has a smaller outer diameter than the front roller and has a cylindrical shape, and the rear roller is rotatably mounted on a shaft fixed to a bracket. Is slidably mounted on a shaft fixed to the base,
The spring is pressed against the front roller by a spring, is joined to the truck via the mounting surface of the base, and the blade of the screw is sandwiched between the front roller and the rear roller. A screw roller section characterized by being moved. 2. A trolley having the screw roller portion according to claim 1, wherein the trolley has a plurality of wheels and a guide roller and runs on a rail. 3. The screw for driving a truck according to claim 2, wherein the screw rotates and stops in a fixed direction or in both directions, and has an insertion position and a removal position of the truck, and may have a stop position in the middle. The pitch of the screw blades gradually increases from a small pitch to a maximum pitch at a portion where movement starts from the insertion position or the stop position, and then reaches the maximum pitch, and further stops at the stop position or the escape position. The screw in the front part is a screw whose pitch is gradually reduced. 4. A transport device comprising the cart according to claim 2 and the screw according to claim 3. 5. The transport device according to claim 4, wherein:
The outer diameter of the front roller of the screw roller is made slightly smaller than the blade space at the screw insertion position, and the bogie is pushed by a cylinder or the like, whereby the front roller is pressed against the side surface of the blade at the screw insertion position. A transport device having an insertion mechanism. 6. A transfer facility having a plurality of carts and a plurality of the transfer devices (excluding the carts) according to claim 5, comprising a closed loop rail, and traveling along a chain conveyor with a dog along the rails. Then, carriages are respectively attached to the carts, and the dogs of the chain conveyor push the carriage hooks of the carriages so that the carts run. When the carriage roller of the carriage is lifted, the carriage hook is also lifted so that the carriage is not pushed by the dog of the chain conveyor. Transport equipment that lifts the carriage roller of the trolley in