JPH09175385A - Floor type double acting trolley conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniature a carrier by carrying a work while supporting its front and rear positions in the carriage direction with one carrier each, on the carry side of a main chain, and also, bringing the front and rear trolleys near to each other to be capable of storaging on the return side of the main chain. SOLUTION: For a main chain (S) 2, many pushers 3 are attached at regular intervals, and many trolleys 4 arranged capably of traveling are pushed with a pusher 3. On the carry side of S2, a work is carried from loading position A to unloading position B, being supported at the front and rear two places of itself, by the carrier 5 attached to the tops of the front and rear two trolleys 4. At the section downstream of the return-side path of S2, when the preceding trolley 4 stops, the following trolley 4 stops, releasing its engagement with the pusher 3 likewise, and gets in storage condition. As a result, the length in carriage direction of the carrier becomes short, and it can invert within the vertical plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor for transporting a work on a floor in a factory or the like by means of a carrier pulled by a main chain, and is particularly suitable for use in a coating booth in a painting process of an automobile factory. Floor type double-acting trolley conveyor

[0002]

2. Description of the Related Art A booth conveyor used for transporting a work in a conventional painting process has wheels 3 running on rails 31 laid on the floor, as shown in FIG.
The carrier 33 having 2 is used, and the competent chain 34
The work W is transported by engaging the dog 35 attached to the carrier 33 with the carrier 33.

The carrying device 33 is carried in at the upstream end of the carrying path where the painting process is started and carried out at the downstream end where the above process is finished. The carrier 33 is used in common in the post-painting steps such as baking, inspection, and repair.

[0004]

However, in the booth conveyor having the above-mentioned structure, the same carrier as that used in the other steps is used as the carrier, and the paint adhered to the carrier in the booth is
There is a problem that coating quality is adversely affected because it is baked in a baking process which is a post process and scattered as paint residue in the subsequent process.

Further, when the coating color is changed between the front and rear works, in order to prevent the mist of the paint used for the previous work from being scattered to the next work, the conveyance interval of the carrier is increased or the air conditioning in the booth is performed. Therefore, it is necessary to remove the floating mist in a short time. However, since the dog attached to the main chain of the booth conveyor described above is fixed to the chain at a constant pitch, the conveying pitch cannot be changed finely, and in the end, a large running cost is required for the air conditioning cost. There was a problem.

As a means for solving the above-mentioned problems using the known technique, for example, a method of using a carrier dedicated to only the painting process and carrying it by a floor type double-acting trolley conveyor can be considered. According to this method, the carrier can be engaged with and disengaged from the main chain, so that the carrying interval of the carrier can be changed.

However, when a work such as a body of a vehicle having a length of 4 to 5 m is conveyed, the length of the carrier is required to be about the same as that of the work, so that the empty carrier and the main chain are horizontally circulated. A long transportation line had to be installed outside the booth, and it was necessary to secure a large space for it.

Therefore, the present invention solves the above-mentioned problems of the prior art and does not require a wide space for forwarding an empty carrier, and the carrier pitch of the carrier can be finely changed according to the work to be carried. A main object of the present invention is to provide a floor-type double-acting trolley conveyor capable of realizing a compact and lightweight carrier.

[0009]

In order to achieve the above-mentioned object, a floor type double-acting trolley conveyor of the present invention has a plurality of pushers arranged at equal intervals and is provided on a transport side and a return side which are vertically parallel. A main chain that is cyclically driven along a path, a pusher dog and a retainer dog that are respectively engageable and disengageable with the pusher are provided to face each other, and a plurality of travelable guide rails arranged along the main chain can travel. Of the trolley and a carrier attached to each of the trolleys. Then, on the transfer side of the main chain, the front and rear positions of one work in the transfer direction are supported and transferred by one carrier, respectively, and on the return side of the main chain, the front and rear trolleys are brought together to store. It is configured to be possible.

The above-mentioned main chain and trolley are arranged below the floor surface, and the carrier exposed below the floor surface and the under-floor surface via a water tank for water sealing arranged along the upper side of the transfer side path of the main chain. It is preferable that the trolley is connected. It is also preferable that the carrier is configured to pass through the cleaning water tank arranged below the return path of the main chain.

[0011]

[Operation] On the transfer side path of the main chain, one work is at the front and rear positions in the transfer direction at the work loading position,
Each is supported by two trolley carriers. Then, the engagement of the pusher dog provided on the preceding trolley and the engagement chain pawl disposed on the engagement chain pulls only the leading trolley, and the trailing trolley does not engage the pusher dog and the pusher. In this state, the work is supported by the works supported between the front and rear carriers, and moves together with the preceding trolley to carry the work.

In the unloading position of the work, the work is unloaded from the carrier of the front and rear trolleys, and then is reversed to the return path of the main chain, and the carrier is also reversed downward along the traveling rail. At this time, the retainer dog supports the trolley so as not to drop downward due to its own weight. The inversion operation of the trolley can be performed with a small inversion radius because the front-rear length of the carrier is shorter than that in the case where the work is conveyed by one carrier. Then, downstream of the return path of the main chain, space-efficient storage is achieved by disengaging the pusher dog of the trolley and the pusher of the main chain and bringing the trolleys closer to each other.

When the main chain and the trolley are arranged under the floor and the carrier on the floor is connected to the trolley via the water-sealing water tank, the main task is that the mist is scattered during the painting process or the like. Prevents paint from entering the chain and trolley. In addition, if a cleaning water tank is placed below the return path of the main chain, dirt such as paint adhered to the carrier is removed while the carrier is passing through the cleaning water tank. It

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an embodiment of a floor type double-acting trolley conveyor of the present invention. The floor type double-acting trolley conveyor 1 is a vertical pit in a pit formed on the floor of a coating booth. It is equipped with a main chain 2 that circulates along the paths of the transport side and the return side parallel to the above. A large number of pushers 3 are attached to the main duty chain 2 at regular intervals, and along the movement path of the main duty chain 2,
A large number of trolleys 4 arranged so as to run freely are pushed by the pusher 3. On the transport side of the main duty chain 2, two front and rear positions of the work W are supported by the carrier 5 attached to the upper portions of the two front and rear trolleys 4 and transported from the loading position A to the unloading position B.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, in which the main chain 2 is attached to the chain guide 7 attached to the conveyor yoke 6 as shown in FIG. It is movably supported by a pair of chain rollers 8, 8 protruding from both sides.

The trolleys 4 are provided so as to face each other vertically at the front and rear positions on both sides thereof.
It is movably supported by a pair of traveling rails 10, 10 supported by the conveyor yoke 6 via a pair of guide rollers 9, 9.

An arm portion 11 is provided on the trolley 4.
The carrier 5 is attached via. The carrier 5 is
It is formed in a rod shape that is oriented at a right angle to the traveling direction of the main service chain 2. The arm part 11 is the main chain 2
It is connected to the carrier 5 through the water stored in the water-seal water tank 12 provided along the movement path of the.

The opening of the pit is shielded by the upper part of the conveyor cover 13 through which the arm 11 can pass,
The passing portion of the arm portion 11 of the conveyor cover 13 is
The water seal water tank 12 is bent downward.
The water tank for water seal 1 that is submerged below the water surface of the pit to prevent paint mist from entering through the pit opening.
The opening is blocked by the water of 2.

In FIG. 1, the transport side of the main service chain 2 is drawn linearly to both ends for the sake of convenience, but in reality, the water seal water tank 12 extends to the vicinity of both ends of the main service chain 2 on the transport side. The moving path of the main chain 2 and the trolley 4 is configured to be inclined slightly upward at both ends of the water seal water tank 12 so that the arm portion 11 is pulled up from the water surface of the water seal water tank 12. There is.

Further, as shown in FIG. 3, a pusher dog 14 and a pusher 3 for engaging the front portion of the pusher 3 of the main service chain 2 to drive the trolley 4 together with the main service chain 2 are provided at the lower part of the trolley 4. A retainer dog 15 that engages with the rear portion and holds the position of the trolley 4 with respect to the pusher 3 without rattling is provided oppositely.

The pusher dog 14 is rotatably supported by a pusher dog pin 16, but when the trolley 4 is in the posture shown in FIG. 1, that is, on the transport side in FIG. 1, the pusher dog pin 16 is engaged with the pusher 3. Since the weight on the opposite side is heavier than the mating side, it tends to rotate in the direction in which the engagement with the pusher 3 is released. On the other hand, in the posture of the trolley 4 in the figure, the retainer dog 15 has a tendency to rotate clockwise around the retainer dog pin 17 and engage with the pusher 3 due to its own weight.

The trolley 4 shown in FIGS. 2 and 3 is
This trolley 4 supports the front of the work W.
The pusher dog 14 is provided with a dog raising roller 18A for rotating the pusher dog 14 on the right side surface in the traveling direction of the trolley 4, as shown in FIG.

The trolley 4 supporting the back of the work W is provided with a dog raising roller 18B similar to the dog raising roller 18A on the left side surface of the pusher dog, as shown by the broken line in FIG. That is, the dog raising rollers 18A and 18B are provided so that every other one of the trolleys 4 protrudes left and right alternately.

The portion on the downstream side of the return path of the main duty chain 2 shown in FIG. 1 is used as an area for storing the trolley 4. In said part, as shown in FIG.
Since the posture of the trolley 4 is opposite to the posture of the trolley 4 shown in FIG. 3, the pusher dog 14 has a moment rotating clockwise in FIG. 4 due to its own weight, and the pusher dog 14 has an external force. In the state where no force is applied, the pusher 3 of the main duty chain 2 tends to automatically engage. However, the rear end portion of each trolley 4 comes into contact with the rear portion of the pusher dog 14 of the preceding trolley 4 and pushes from the pusher 3 to the pusher dog 14
Since the dog release projection 19 for separating the
When the preceding trolley 4 stops, the following trolley 4
The pusher dog 14 is disengaged from the pusher 3 by the dog releasing projection 19 of the preceding trolley 4 and stopped there, and each succeeding trolley 4 is similarly engaged with the pusher 3. Is released and stopped, and the storage status is entered.

The operation of stopping the leading trolley 4 is performed by operating a stopper 20 which can be retracted and is arranged near the downstream end of the return path of the main service chain 2. That is, at the protruding position, the stopper 20 contacts the pusher dog 14 of the leading trolley 4 and rotates it counterclockwise to release the engagement with the pusher 3 and prevent the forward movement thereof. Stop on the spot.

When the leading trolley 4 is towed by the service chain 2 and conveyed, the stopper 2 is used.
When 0 is retracted, the pusher dog 14 is rotated clockwise by the moment due to its own weight, engages with the pusher 3 which is moving forward, and is pulled out by the main service chain 2 and sent out. Then, in the subsequent trolley 4 in which the pusher dog 14 is held by the dog release protrusion 19 of the leading trolley 4, the dog release protrusion 19 is disengaged from the pusher dog 14, so that the dog release protrusion 19 is removed.
Is engaged with the pusher 3 and is sent forward. Then, by causing the stopper 20 to project again there,
The trolley 4 can be made to stand by on the spot.

As described above, the trolley 4 released from the stopper 20 moves upward along the reversing part of the main chain 2, but here the posture of the trolley 4 is reversed, so that the pusher dog 14 is not supported. Due to its own weight, a moment acts in a direction of moving away from the pusher 3 of the main duty chain 2. Therefore, from the middle of the inverting section,
The dog raising rollers 18A, 18 provided on the pusher dog 14 of each trolley over the upper transport side path.
Dog holding rails 21 that come into contact with B are installed on both sides. As for the dog holding rail 21, the pusher dog 14 is used as the main chain 2 when the trolley 4 moves along the transport side path.
It serves to hold the pusher 3 so as not to separate it.

Then, as shown in FIG. 1, when the two trolleys 4 for supporting the front and rear of the work W move from the return side path to the transfer side path, the front trolley 4 and the rear trolley 4 are loaded. The front trolley stop position P and the rear trolley stop position Q before and after the position A are separated from the main chain 2 and stopped. Therefore, at each of the stop positions P and Q, the dog holding rail 21 is absent, and a movable dog rail unit having a structure described later is installed at each position.

That is, as shown in FIGS. 5A and 5B, the movable dograil unit 22 installed at the stop position P has a dog raising roller 18A (see FIG. 2) protruding from the pusher dog 14. A movable rail 23 having a U-shaped cross section for sandwiching and guiding) from above and below.
It has. The movable rail 23 is supported by a pair of front and rear links 24A and 24B, and is moved up and down by a telescopic operation of the cylinder 25 between a lowered position shown in (a) and a raised position shown in (b) of FIG. Is configured. Then, when the movable rail 23 is in the lowered position as shown in FIG. 4A, the dog raising roller 1 is moved from the right side of FIG.
8A enters the movable rail 23 from the dog holding rail 21. Here, when the cylinder 25 is extended and the movable rail 23 is raised as shown in FIG. 3B, the dog raising roller 18A is forcibly pushed up, so that the pusher dog 14 having the structure shown in FIG. After leaving 3, the trolley 4 stops there. The operation timing of the movable dograil unit 22 is set to the front trolley 4
The position sensor or the like can detect that the vehicle has reached the vicinity of the stop position P.

At the stop position Q in FIG. 1, a movable dogler unit (not shown) having the same mechanism as the movable dogler unit 22 is provided. The movable rail of the movable dograil unit is indicated by a broken line in FIG.
In order to guide the dog raising roller 18B protruding from the pusher dog of the rear trolley 4, the movable rail 23
It has a U-shaped cross section opposite to.

Similar to the front trolley 4, the rear trolley 4 detects that it has reached the vicinity of the stop position Q by a position sensor or the like, and raises the movable rail of the movable dograil unit at the stop position Q by the detection signal. Therefore, the vehicle is stopped at the stop position Q. The trolleys 4 and 4 before and after the stop are positioned by the positioning devices K1 and K2 so as to be accurately positioned at the respective stop positions P and Q, and then the work W is attached to the trolleys 4 respectively.
It is mounted between the transporters 5 of.

When the conveyance of the work W is started, the movable rail of the movable dograil unit at the stop position Q is raised and the movable rail 23 of the movable dograil unit 22 at the stop position P is lowered. Then, the pusher dog 14 of the front trolley 4 is brought into the state shown in FIG. 3 in which the pusher dog 14 is engaged with the pusher 3 moving from the rear. At this time, when the pusher 3 comes into contact with the retainer dog 15 from the rear, the retainer dog 15 rotates upward about the retainer dog pin 17 and passes through the pusher 3 without any trouble.

Since the carrier 5 of the front trolley 4 and the carrier 5 of the rear trolley 4 are connected by the work W, when the front trolley 4 is towed by the main chain 2, the rear trolley also moves to this. Therefore, the movement is started.

At this time, the dog raising roller 18B (see FIG. 2) of the rear trolley 4 is located on the upper surface side of the dog holding rail 21, and the pusher dog of the rear trolley 4 is different from the pusher 3 of the main chain 2. Since the work W is held in the non-engaged position, only the front trolley 4 is pulled by the chain while the work W is being conveyed. Therefore, the interval between the front and rear carriers 5 is not restricted by the interval at which the pusher 3 is attached to the service chain 2, and the work can be conveyed at a free interval that matches the length of the work W.

As described above, the two front and rear trolleys 4 and 4 which have transported the work W along the transport side path of the main chain 2 have the front and rear transporters 5 and 5 at the unloading position B shown in FIG.
The work W is unloaded.

Although not shown in the drawings, before and after the unloading position B, the loading position A described above is provided at the stopping position R of the front trolley 4 and the stopping position S of the rear trolley 4, respectively.
A movable dograil unit with a structure similar to that installed on the side is installed, where the front trolley 4 is separated from the main chain 4, and the front and rear trolleys 4, 4 are separated.
Positioning devices K3 and K4 provided at the unloading position B
The workpiece W is unloaded while the positioning is stopped at an accurate position by.

The trolleys 4, 4 before and after unloading the work W are engaged with the pusher dog 14 and the pusher 3 by the movable dograil unit,
It is turned over again to the return path. When the trolley 4 reverses to the return path, the pusher dog 14 and the retainer dog 1
Both 5 and 5 are maintained in a state of being engaged with the pusher 3.

In this embodiment, as shown in FIG. 6, a cleaning water tank 26 is provided below the return path of the main service chain 2, and the carrier 5 of each trolley 4 is equipped with the cleaning water tank 2 described above.
In a state of being immersed in the cleaning water stored in 6, it is conveyed to the downstream side, and the paint and the like adhering to the carrier 5 is cleaned with the cleaning water.

[0039]

As described above, according to the floor type double-acting trolley conveyor of the present invention, one work is supported at each of the front and rear positions in the carrying direction to carry the work. Therefore, the length of the carrying device in the carrying direction is shortened, and the carrying device can be inverted in a vertical plane.

As a result, a large number of empty carriers can be stored in parallel below the work transfer side, so that they can be installed in a small space. Further, since the carrier can be made smaller and lighter, power consumption can be reduced, and the amount of mist of paint adhered to the carrier can be reduced when used in a coating line. Since it is not exchanged with other processes, the coating quality attached to the carrier is not lost in other processes and the coating quality is not impaired.

Further, when the main chain and the trolley are arranged below the floor and the transporter on the floor is connected to the trolley via the water-sealing water tank, paint mist or the like generated in the painting process is removed. Prevents scattered materials from entering the main chain and the trolley, and the need for frequent cleaning of the inside of the conveyor makes maintenance easier, and since there are few moving parts exposed on the floor, it is safe. Can be improved.

Further, when the cleaning water tank is arranged below the return side path of the main service chain, the cleaning of the transportation device is performed by itself because the cleaning of the transportation device is performed by itself while passing through the cleaning water tank. You can save time.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a floor type double-acting trolley conveyor of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a side view showing the structure of the trolley in one embodiment of the floor type double-acting trolley conveyor of the present invention.

FIG. 4 is a diagram showing a storage state of a trolley in one embodiment of the floor type double-acting trolley conveyor of the present invention.

FIG. 5 is a view showing the structure of a dog operating unit in one embodiment of the floor type double-acting trolley conveyor of the present invention.
(A) shows a state where the movable rail is in the lowered position, and (b) shows a state where the movable rail is in the raised position.

FIG. 6 is a sectional view showing the structure of a carrier cleaning water tank in one embodiment of the floor type double-acting trolley conveyor of the present invention.

FIG. 7 is a diagram showing an example of a booth conveyor used in a conventional coating process.

[Explanation of symbols]

 1 Floor type double-acting trolley conveyor 2 Main chain 3 Pusher 4 Trolley 5 Transporter 12 Water seal water tank 26 Washing water tank W work

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihisa Sakamoto 4-17-96 Tsurumi, Tsurumi-ku, Osaka City, Osaka Prefecture Tsubakimoto Chain Co., Ltd.

Claims (3)

[Claims] 1. A main service chain having a plurality of pushers arranged at equal intervals and being circulated and driven along a vertically parallel path of a transport side and a return side, and a pusher dog and a retainer dog which are respectively engageable and disengageable with the pusher. And a plurality of trolleys that are provided so as to face each other and are capable of traveling by being guided by traveling rails arranged along the main duty chain, and a carrier attached to each of the trolleys. The feature is that one work is supported by one carrier at the front and the back position in the transfer direction, and at the return side of the main chain, the front and rear trolleys are brought close together for storage. Floor type double-acting trolley conveyor. 2. The carrier chain and the trolley are arranged below the floor surface, and the carrier and the floor surface exposed on the floor surface via a water-seal water tank arranged along the upper side of the transport side path of the job chain. The floor type double-acting trolley conveyor according to claim 1, wherein the floor trolley is connected to the lower trolley. 3. The floor type double-acting trolley according to claim 1 or 2, wherein the carrier is configured to pass through a cleaning water tank arranged below a return path of the main service chain. Conveyor.