A trolley traction mechanism for workpiece transfer of a spray production line and a working method thereof

Abstract

This invention relates to a trolley traction mechanism and its working method for workpiece transfer in a spray painting production line. The trolley traction mechanism includes a circulating chain buried underground for pulling the main body of the trolley frame and traction components fixed at equal intervals on the circulating chain. The main body of the trolley frame is provided with a liftable fixing pin that can be limited by the traction components, so that the main body of the trolley frame can move with the circulating chain after the liftable fixing pin is limited by the traction components. The liftable fixing pin is vertically slidably connected inside a vertical tube sleeve, which is fixed to the main body of the trolley frame. A horizontal fixing rod is horizontally fixedly connected to the main body of the trolley frame, with its inner end fixedly connected to the outer surface of the vertical tube sleeve. The horizontal fixing rod is oriented in the same direction as the trolley's travel direction. This invention relies on a linkage-type automatic locking pin mechanism to completely eliminate the manual insertion and removal of fixing pins, realizing automatic hooking, locking, and releasing of the trolley, greatly reducing the intensity of manual labor, accelerating the production line's cycle time, and improving overall production capacity.

Description

Technical Field

[0001] This invention belongs to the technical field of conveying equipment for automated spraying production lines, specifically relating to a trolley traction mechanism for transferring workpieces in a spraying production line and its working method. Background Technology

[0002] Currently, transfer trolleys are widely used in various workpiece coating production lines to complete workpiece transfer and workstation switching processes. However, existing traditional transfer trolleys have many defects in practical applications, which seriously restrict the automation level, production efficiency, and product quality of the production line. The specific problems are as follows: 1. Low degree of automation: The positioning and fixing of the trolley relies on manual insertion and removal of fixing pins, which results in a large workload of manual operation, low work efficiency, and inability to adapt to continuous production mode; 2. Poor trolley running accuracy: There is no special positioning fixture for the workpiece axle to be coated, the axle installation accuracy is insufficient, and the trolley is prone to deviation during movement, which will cause uneven wear of the wheels. At the same time, the deviation of the trolley body will directly lead to uneven coating of the workpiece and a decrease in product qualification rate. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to overcome the problem of low efficiency caused by the need for manual insertion and removal of fixing pins for positioning of the transfer trolley in the existing spray painting production line, and to provide a trolley traction mechanism and its working method for workpiece transfer in the spray painting production line, specifically achieving the following objectives:

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A trolley traction mechanism for workpiece transfer in a spray painting production line is characterized by comprising: a circulating chain buried underground for pulling the main body of the trolley frame, and traction components fixed at equal intervals on the circulating chain; the main body of the trolley frame is provided with liftable fixing pins that can be limited by the traction components, so that the main body of the trolley frame can move with the circulating chain after the liftable fixing pins are limited by the traction components; the liftable fixing pins are vertically slidably connected to a vertical tube sleeve, the vertical tube sleeve being fixed to the main body of the trolley frame; a horizontal fixing rod is horizontally fixedly connected to the main body of the trolley frame, the inner end of which is fixedly connected to the outer surface of the vertical tube sleeve; the horizontal fixing rod is oriented in the same direction as the trolley's travel direction; an outer sleeve that can slide horizontally is fitted onto the outer end of the horizontal fixing rod; a baffle is fixedly connected to the outer end of the outer sleeve; and the inner end of the outer sleeve is fixedly connected to the horizontal fixing rod. The first end of the spring on the fixed rod abuts against the upper wall of the vertical tube sleeve, and the second end of the spring abuts against the upper wall of the vertical tube sleeve. A V-shaped swing arm is rotatably connected to the frame body. The first end of the V-shaped swing arm has a through hole that fits onto the horizontal fixed rod. The inner end of the outer sleeve and the first end of the spring abut against the two opposite surfaces of the first end of the V-shaped swing arm. The second end of the V-shaped swing arm is clamped on the upper part of the liftable fixed pin. When the baffle is moved and the outer sleeve moves toward the vertical tube sleeve, the V-shaped swing arm is driven to rotate, and then the second end of the V-shaped swing arm drives the liftable fixed pin to rise. When the baffle is not under force, the spring moves the outer sleeve away from the vertical tube sleeve, drives the V-shaped swing arm to rotate in the opposite direction, and then the second end of the V-shaped swing arm drives the liftable fixed pin to fall, so that it can be limited by the pulling member.

[0006] Preferably, the upper part of the aforementioned liftable fixing pin is provided with an annular recessed groove, and the second end of the V-shaped swing arm is provided with a fork that is embedded in the annular recessed groove.

[0007] Preferably, the outer end of the frame body is provided with a guide tube, and the outer sleeve is slidably connected inside the guide tube.

[0008] Preferably, the frame body is provided with a plurality of axle positioning fixtures for constraining the position of the axles, and the upper surface of the axle positioning fixtures is a V-shaped groove.

[0009] Preferably, a liftable stop block is provided at the spraying station to press against the baffle. After the liftable stop block rises, it blocks the baffle, and the circulating chain pulls the trolley to continue moving through the traction member and the liftable fixing pin, so that the baffle moves toward the vertical tube sleeve, the liftable fixing pin is raised, and the limiting member of the circulating chain no longer pulls the trolley to move.

[0010] Preferably, the aforementioned liftable stop is driven to rise and fall by a hydraulic cylinder buried underground.

[0011] Preferably, the aforementioned pulling member includes a fixing block fixed on the circulating chain and a limiting groove provided in the fixing block, the limiting groove being used to limit the liftable fixing pin.

[0012] Preferably, the above-mentioned circulating chain is provided with sprockets on both sides, one of which is driven by a motor and a reducer.

[0013] The present invention relates to a working method for a trolley traction mechanism for workpiece transfer in a spraying production line. The method is characterized in that: the production line traction system, through the operation of a circulating chain, drives the traction component, the liftable fixing pin, and the trolley to move. When the trolley transports the workpiece to the designated spraying station, the liftable stop rises, and the baffle on the trolley body is squeezed by the limit of the liftable stop at the spraying station. When the baffle is moved, causing the outer sleeve to move towards the vertical tube sleeve, it drives the V-shaped swing arm to rotate. The second end of the V-shaped swing arm then drives the liftable fixing pin to rise, disengaging it from the limit of the traction component. The trolley then stops at the spraying station, while the circulating chain continues to run. At this time, the workpiece can be sprayed at this station. After the spraying operation is completed, the liftable stop descends. Without external force acting on the baffle, the V-shaped swing arm swings due to the action of a spring, causing the liftable fixing pin to descend. As the circulating chain continues to run, the limiting groove of one of the traction components embeds into the lower end of the liftable fixing pin, thereby driving the trolley to run along with the circulating chain.

[0014] Compared with the prior art, the present invention has the following significant advantages:

[0015] 1. Relying on the linkage automatic locking mechanism, the manual insertion and removal of fixing pins is completely eliminated, realizing the automatic engagement, locking and release of the trolley, which greatly reduces the intensity of manual labor, speeds up the production line cycle, and improves the overall production capacity;

[0016] 2. The traction and locking actions are integrated and linked, eliminating the jamming and misalignment problems caused by the separation of traction and locking in traditional equipment, resulting in stronger production line operation stability.

[0017] 3. The special axle positioning fixture ensures the coaxiality of the wheels and the straightness of the travel, prevents the trolley from deviating, significantly improves the uniformity of workpiece spraying, increases the product qualification rate, and reduces abnormal wear of the wheels. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of the present invention in use;

[0019] Figure 2 yes Figure 1 A partial schematic diagram;

[0020] Figure 3 yes Figure 2 A diagram showing the wheels after installation;

[0021] Figure 4 yes Figure 3 A top-down view;

[0022] Figure 5 This is a front view schematic diagram of the axle positioning fixture and the workpiece (axle) to be processed according to the present invention. Detailed Implementation

[0023] The present invention provides a trolley traction mechanism for workpiece transfer in a spraying production line, comprising a circulating chain 2 buried underground for pulling the main body 1 of the trolley frame and traction components 3 fixed at equal intervals on the circulating chain. The circulating chain 2 has sprockets 201 on both sides, one of which is driven by a motor and a reducer. The circulating chain 2 is wound around the sprockets 201 on both sides. The reducer is connected to the output end of the motor, and the output end of the reducer is connected to a sprocket 201 to rotate, thereby driving the circulating chain 2 to run.

[0024] The frame body 1 is provided with a liftable fixing pin 4 that can be limited by the pull member 3, so that the frame body 1 can move with the circulating chain 2 after the liftable fixing pin 4 is limited by the pull member 3. The liftable fixing pin 4 can be a cylindrical pin or a hook. When the liftable fixing pin 4 is a cylindrical pin, the pull member 3 includes a fixing block fixed on the circulating chain and a limiting groove 301 provided in the fixing block. The groove of the limiting groove 301 can be provided on the upper surface and side surface of the fixing block (the side closer to the direction of travel, so as to limit the liftable fixing pin when the chain travels).

[0025] The adjustable fixing pin 4 is vertically slidably connected inside the vertical tube sleeve 5. The vertical tube sleeve 5 is fixed on the frame body 1. A horizontal fixing rod 6 is horizontally fixedly connected to the frame body 1, with its inner end fixedly connected to the outer surface of the vertical tube sleeve. The horizontal fixing rod is oriented in the same direction as the trolley's travel. An outer sleeve 7 that can slide horizontally is fitted on the outer end of the horizontal fixing rod. A baffle 8 is fixedly connected to the outer end of the outer sleeve 7. The baffle 8 is perpendicular to the trolley's travel direction. The inner end of the outer sleeve 7 is close to the first end of the spring 9 fitted on the horizontal fixing rod. The second end of the spring 9 is in contact with the outer wall of the vertical tube sleeve. That is, the spring can push the outer sleeve 7 to move away from the vertical tube sleeve 5.

[0026] A V-shaped swing arm 10 is rotatably connected to the frame body 1. The first end of the V-shaped swing arm has a through hole 101 that is sleeved on the horizontal fixed rod. The inner end of the outer sleeve and the first end of the spring respectively abut against the two opposing surfaces of the first end of the V-shaped swing arm. The second end of the V-shaped swing arm is clamped on the upper part of the liftable fixing pin (specifically, the upper part of the liftable fixing pin has an annular recessed groove 401, and the second end of the V-shaped swing arm 10 has a fork 102 embedded in the annular recessed groove). During operation, when the baffle is moved to move the outer sleeve towards the vertical tube sleeve, the V-shaped swing arm is driven to rotate, and then the second end of the V-shaped swing arm drives the liftable fixing pin to rise. When the baffle is not under force, the spring causes the outer sleeve to move away from the vertical tube sleeve, driving the V-shaped swing arm to rotate in the opposite direction, and then the second end of the V-shaped swing arm drives the liftable fixing pin to fall so that it can be limited by the pulling member.

[0027] To ensure smooth sliding of the outer sleeve, a guide tube 11 is provided at the outer end of the frame body 1, and the outer sleeve is slidably connected inside the guide tube 11. Wheels 15 are installed on the frame body 1.

[0028] In order to achieve the positioning of the axle to be processed, the main body of the frame is provided with several axle positioning fixtures 12 for constraining the position of axle A. The upper surface of the axle positioning fixture is a V-shaped groove. The symmetrical center plane of two sets of V-shaped grooves is perpendicular to the ground and passes through the axis of the wheel 15, which can ensure the stability of the trolley operation.

[0029] The main frame 1 is rectangular (e.g.) Figure 4 As shown, each axle to be processed requires the installation of two axle positioning fixtures. The two axle positioning fixtures are symmetrically arranged on both sides of the horizontal fixed rod (and there is a gap between the two axle positioning fixtures), so that the axle positioning fixtures do not affect the installation of the V-shaped swing arm.

[0030] A liftable stop block 13 is provided at the spraying station to press against the baffle. After the liftable stop block rises, the liftable stop block 13 is driven to rise and fall by the hydraulic cylinder 14 buried in the ground (the opening and closing of the hydraulic cylinder 14 can be controlled by a switch). The liftable stop block can block the baffle 8, and the circulating chain pulls the trolley to continue moving through the traction member and the liftable fixing pin, so that the baffle moves toward the vertical tube sleeve, the liftable fixing pin is raised, and the limiting member of the circulating chain no longer pulls the trolley to move.

[0031] This invention relates to a working method for a trolley traction mechanism for workpiece transfer in a spray painting production line. The production line traction system, through the operation of a circulating chain, drives the traction component, a liftable fixing pin, and the trolley to move. When the trolley transports a workpiece to the designated spray painting station, the liftable stop rises. The baffle on the trolley body is limited by the liftable stop at the spray painting station, causing it to be squeezed. When the baffle is moved, causing the outer sleeve to move vertically, it drives the V-shaped swing arm to rotate. The second end of the V-shaped swing arm then drives the liftable fixing pin to rise, disengaging it from the traction component's limit. The trolley then stops at the spray painting station, while the circulating chain continues to run. At this time, the workpiece can be sprayed at this station. After the spray painting is completed, the liftable stop descends. Without external force acting on the baffle, the V-shaped swing arm swings due to the action of a spring, causing the liftable fixing pin to descend. As the circulating chain continues to run, the limiting groove of one of the traction components engages with the lower end of the liftable fixing pin, thereby driving the trolley to run along with the circulating chain.

[0032] Compared with the prior art, the present invention has the following significant advantages:

[0033] 1. Relying on the linkage automatic locking mechanism, the manual insertion and removal of fixing pins is completely eliminated, realizing the automatic engagement, locking and release of the trolley, which greatly reduces the intensity of manual labor, speeds up the production line cycle, and improves the overall production capacity;

[0034] 2. The traction and locking actions are integrated and linked, eliminating the jamming and misalignment problems caused by the separation of traction and locking in traditional equipment, resulting in stronger production line operation stability.

[0035] 3. The special axle positioning fixture ensures the coaxiality of the wheels and the straightness of the travel, prevents the trolley from deviating, significantly improves the uniformity of workpiece spraying, increases the product qualification rate, and reduces abnormal wear of the wheels.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A trolley traction mechanism for transferring workpieces in a spray painting production line, characterized in that: The system includes a circulating chain buried underground for towing the main frame and traction components fixed at equal intervals on the circulating chain. The main frame is equipped with adjustable fixing pins that can be limited by the traction components, allowing the main frame to move with the circulating chain after the adjustable fixing pins are limited by the traction components. The adjustable fixing pins are vertically slidably connected within a vertical sleeve, which is fixed to the main frame. A horizontal fixing rod is horizontally fixed to the main frame, with its inner end fixed to the outer surface of the vertical sleeve. The horizontal fixing rod faces the same direction as the vehicle's travel. A horizontally slidable outer sleeve is fitted onto the outer end of the horizontal fixing rod, and a baffle is fixedly connected to the outer end of the outer sleeve. The inner end of the outer sleeve abuts against the first end of a spring fitted onto the horizontal fixing rod. The second end of the spring abuts against the outer wall of the vertical sleeve. A V-shaped swing arm is rotatably connected to the frame body. The first end of the V-shaped swing arm has a through hole that fits onto the horizontal fixed rod. The inner end of the outer sleeve and the first end of the spring abut against the two opposing surfaces of the first end of the V-shaped swing arm. The second end of the V-shaped swing arm is clamped to the upper part of the liftable fixed pin. When the baffle is moved and the outer sleeve moves toward the vertical sleeve, the V-shaped swing arm is driven to rotate, and then the second end of the V-shaped swing arm drives the liftable fixed pin to rise. When the baffle is not under force, the spring moves the outer sleeve away from the vertical sleeve, drives the V-shaped swing arm to rotate in the opposite direction, and then the second end of the V-shaped swing arm drives the liftable fixed pin to fall, so that it can be limited by the pulling member.

2. The trolley traction mechanism for workpiece transfer in a spray painting production line according to claim 1, characterized in that: The upper part of the liftable fixing pin is provided with an annular recessed groove, and the second end of the V-shaped swing arm is provided with a fork that is embedded in the annular recessed groove.

3. The trolley traction mechanism for workpiece transfer in a spray painting production line according to claim 2, characterized in that: The outer end of the frame body is provided with a guide tube, and the outer sleeve is slidably connected inside the guide tube.

4. The trolley traction mechanism for workpiece transfer in a spray painting production line according to claim 3, characterized in that: The main body of the frame is provided with a number of axle positioning fixtures for constraining the position of the axles, and the upper surface of the axle positioning fixtures is a V-shaped groove.

5. The trolley traction mechanism for workpiece transfer in a spray painting production line according to claim 4, characterized in that: A liftable stop block is provided at the spraying station to press against the baffle. After the liftable stop block rises, it blocks the baffle, and the circulating chain pulls the trolley to continue moving through the traction component and the liftable fixing pin, so that the baffle moves toward the vertical tube sleeve, the liftable fixing pin is raised, and the limiting component of the circulating chain no longer pulls the trolley to move.

6. The trolley traction mechanism for workpiece transfer in a spray painting production line according to claim 5, characterized in that: The liftable stop is driven to rise and fall by a hydraulic cylinder buried underground.

7. The trolley traction mechanism for workpiece transfer in a spray painting production line according to claim 1, characterized in that: The traction component includes a fixing block fixed on the circulating chain and a limiting groove provided in the fixing block. The limiting groove is used to limit the liftable fixing pin.

8. The trolley traction mechanism for workpiece transfer in a spray painting production line according to claim 1, characterized in that: The circulating chain has sprockets on both sides, one of which is driven by a motor and a reducer.

9. A working method for a trolley traction mechanism for workpiece transfer in a spray painting production line, characterized in that: The production line traction system uses a circulating chain to move the traction components, the liftable fixing pin, and the trolley. When the trolley transports a workpiece to the designated spraying station, the liftable stop rises. The baffle on the trolley body is squeezed by the limit of the liftable stop at the spraying station. When the baffle is moved, causing the outer sleeve to move towards the vertical tube sleeve, it drives the V-shaped swing arm to rotate. The second end of the V-shaped swing arm then drives the liftable fixing pin to rise. The liftable fixing pin disengages from the limit of the traction component, and the trolley stops at the spraying station. The circulating chain continues to run, and the workpiece can then be sprayed at this station. After the spraying operation is completed, the liftable stop descends. The baffle is not subjected to external force. The V-shaped swing arm swings due to the action of the spring, causing the liftable fixing pin to descend. As the circulating chain continues to run, the limiting groove of one of the traction components engages with the lower end of the liftable fixing pin, thereby driving the trolley to run along with the circulating chain.

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