A workpiece transfer device

Abstract

This utility model relates to a workpiece transfer device, belonging to the field of workpiece feeding technology. It includes a frame, a placement fixture unit, and a sliding lifting mechanism. The fixture bearing face of the frame is inclined, with the front higher than the rear. Multiple pairs of evenly distributed buffer fixtures are provided on the frame. The placement fixture unit includes a pair of placement fixtures and a lifting cylinder. The sliding lifting mechanism includes a lifting frame, multiple pairs of lifting fixtures, a lifting cylinder, and a sliding cylinder. Under the action of the sliding lifting mechanism, the lifting fixtures can lift the workpiece from the lower buffer fixture and move it to the higher buffer fixture. This utility model has a simple structure and is easy to operate. Workpieces can be quickly, stably, and automatically transferred from the lower to the higher buffer fixtures. The workpiece transferred to the placement fixture can also be lifted to a suitable gripping height, meeting the requirements of accurate workpiece gripping height for robots, and significantly improving the efficiency of workpiece transfer between buffer fixtures.

Description

Technical Field

[0001] This utility model relates to a workpiece transfer device, belonging to the field of workpiece feeding technology. Background Technology

[0002] The production of automotive body-in-white involves processes such as stamping, welding, gluing, and hemming, requiring equipment such as fixtures, welding guns, gluing equipment, and hemming equipment, as well as other supporting auxiliary equipment.

[0003] The car body-in-white is a complex structural component, consisting of numerous sheet metal stampings. These stampings need to be joined together using various methods such as welding and riveting. After being processed in the stamping workshop, the stampings will enter the welding workshop for welding. With the rapid development of welding technology, welding lines often use robots for welding, which requires moving the workpiece to the corresponding position so that the robot can accurately grasp it. The workpiece transfer device is one of the necessary auxiliary equipment.

[0004] Existing workpiece transfer devices mostly employ planar transfer, such as chain transfer. The workpiece is placed at the upper position on the chain, and the chain drive moves the workpiece to a position where the robot can grasp it. This transfer method can only transfer workpieces at different positions at the same height, and is not suitable for situations where the pick-up position is higher than the upper position. Manual transfer and feeding not only results in high labor intensity for workers and low transfer efficiency, which is incompatible with the rhythm of automated welding operations, but also the positioning of manually transferred workpieces at the pick-up position is susceptible to human error, affecting the accurate pick-up by the robot. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a workpiece transfer device.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A workpiece transfer device includes a frame, a placement fixture unit and a sliding lifting mechanism arranged on the frame. The left and right sides of the frame are respectively provided with fixture bearing surfaces. The fixture bearing surfaces are inclined with the front higher than the back. The frame is provided with multiple pairs of buffer fixtures for positioning workpieces. The multiple pairs of buffer fixtures are evenly arranged on the fixture bearing surfaces.

[0007] The placement fixture unit includes a pair of placement fixtures for positioning workpieces and a lifting cylinder for driving the placement fixtures to lift. The workpiece on the buffer fixture located at the foremost side can be transferred to the placement fixture under the action of the sliding lifting mechanism. Under the action of the lifting cylinder, the workpiece on the placement fixture can be raised to the gripping height of the picking position.

[0008] The sliding lifting mechanism includes a lifting frame, multiple pairs of lifting fixtures for positioning workpieces mounted on the lifting frame, lifting cylinders for driving the lifting frame to rise and fall, and sliding cylinders for driving the lifting frame to move. The number of lifting fixtures is the same as the number of buffer fixtures. The lifting cylinders are mounted on the sliding frame, and the piston rods of the lifting cylinders are connected to the lifting frame. The sliding frame is slidably mounted on the machine frame. The sliding cylinders are mounted on the machine frame, and the piston rods of the sliding cylinders are connected to the sliding frame. Under the action of the sliding lifting mechanism, the lifting fixtures can lift the workpieces on the lower buffer fixtures and move them to the higher buffer fixtures.

[0009] The beneficial effects of this utility model are that when the workpiece is transferred, the sliding lifting mechanism and the lifting cylinder are activated. The lifting fixture can lift the workpiece on the low-position buffer fixture, and the sliding cylinder can move the workpiece forward to the top of the front buffer fixture. The lifting cylinder descends, and the workpiece falls onto the front buffer fixture. Then the sliding lifting mechanism returns to its original position, and the workpiece is moved forward to the front buffer fixture. This process is repeated continuously until the workpiece is transferred to the placement fixture of the placement fixture unit. Under the action of the lifting cylinder, the placement fixture can be moved to the gripping height of the robot's gripper, thus completing the transfer of the workpiece from the material box to the picking position. This invention features a simple structure and convenient operation. It enables rapid, stable, and automatic transfer of workpieces from low to high positions on the buffer fixture. Furthermore, the workpieces transferred to the fixture can be raised to a suitable gripping height to meet the requirements of accurate workpiece retrieval by the robot. The workpiece transfer efficiency between the low loading position and the high retrieval position is high, and no manual intervention is required, which greatly reduces production costs and labor intensity, and improves the automation level of the production line.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the frame includes a base frame and a frame mounted on the base frame. The frame is inclined on the base frame with a front higher than the rear. The clamp bearing surfaces are located on both sides of the frame. The frame is also provided with a sliding tilting platform. The sliding frame is mounted on the sliding tilting platform via a sliding guide rail.

[0012] The beneficial effect of adopting the above-mentioned further solution is that a sliding tilting platform is provided on the frame for positioning and installing the sliding frame. This eliminates the need for tilting the lifting frame or the sliding frame; the sliding frame can simply be installed on the sliding tilting platform. This ensures that the movement of the sliding frame on the sliding tilting platform allows the workpiece on the lower buffer fixture to be transferred to the higher buffer fixture. The frame not only supports the buffer fixture but also provides space for the sliding lifting mechanism to move, contributing to the stability and smoothness of the workpiece during transfer, thus meeting the requirements of high efficiency and stability in the workpiece transfer device.

[0013] Furthermore, the lifting cylinder is mounted on a cylinder mounting plate, which is connected to the frame via a connecting bracket. A pair of placement clamps are mounted on the lifting bracket, and the piston rod of the lifting cylinder is connected to the lifting bracket.

[0014] The beneficial effect of adopting the above-mentioned further solution is that the cylinder mounting plate is stably connected to the frame through the connecting bracket, which ensures the installation and positioning of the fixture unit. The overall structure of the workpiece transfer device is compact and the layout is more reasonable.

[0015] Furthermore, a first guide mechanism is provided between the lifting bracket and the mounting plate. The first guide mechanism includes a first guide rod and a first guide sleeve fitted on the outside of the first guide rod. The first guide sleeve is disposed on the cylinder mounting plate, and the first guide rod is connected to the lifting bracket.

[0016] The beneficial effects of adopting the above-mentioned further solution are that the workpiece can be transported to the placement fixture under the action of the sliding lifting mechanism, the robot picks up the workpiece at a certain height, and the placement fixture and the workpiece are transported to the picking height of the robot's gripper under the action of the lifting cylinder. The setting of the first guiding mechanism can ensure the stability of the lifting bracket during the lifting process, reduce the radial force on the lifting cylinder, and prevent it from deviating due to uneven force, thereby ensuring the accuracy and safety of workpiece transfer.

[0017] Furthermore, the sliding cylinder is connected to the frame via a mounting bracket.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the piston rod of the sliding cylinder is connected to the sliding frame. Through the extension and retraction action of the sliding cylinder, the sliding frame can be driven to move back and forth on the sliding guide rail, thereby realizing the transfer of the workpiece from the low-level buffer fixture to the high-level buffer fixture and the placement fixture.

[0019] Furthermore, the frame is also provided with limiting mechanisms for limiting the forward and backward positions of the sliding frame.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the limiting mechanism can limit the position of the sliding frame in moving forward to transport the workpiece and in moving backward to return to its original position, which can effectively prevent the sliding frame from exceeding the predetermined movement range and ensure the stability and safety of the workpiece transfer device.

[0021] Furthermore, the limiting mechanism includes a limiting bracket and a first limiting block disposed on the limiting bracket, the limiting bracket being disposed on the frame.

[0022] The beneficial effect of adopting the above-mentioned further solution is that the first limiting block is set in front of and behind the sliding frame through the limiting bracket. It is used to contact the sliding frame when it moves forward or backward to the required position, thereby restricting the movement of the sliding frame and enabling the sliding frame to stop at a precise position. This ensures that each sliding and lifting action of the sliding frame can enable the workpiece at the lower rear position to move forward to the buffer fixture or placement fixture at the higher position, realizing the movement of the workpiece at the lower loading position to the higher picking position, and improving the accuracy and reliability of workpiece transfer.

[0023] Furthermore, it also includes a buffer, which is disposed on the limiting bracket.

[0024] The beneficial effect of adopting the above-mentioned further solution is that the buffer can play a buffering role when the sliding frame moves to the front and rear limit positions, avoid direct hard collision between the sliding frame and the first limit block, reduce impact and noise, and protect the sliding frame from damage.

[0025] Furthermore, the limiting mechanism also includes a second limiting block, which is connected to the sliding frame via a connecting block.

[0026] The beneficial effect of adopting the above-mentioned further solution is that when the sliding frame moves to the front limit position or the rear limit position, the second limiting block contacts the first limiting block to effectively limit the front and rear positions of the sliding frame, avoiding direct contact and collision of the sliding frame with the first limiting block, which would affect the service life of the sliding frame over a long period of time.

[0027] Furthermore, a second guide mechanism is provided between the sliding frame and the lifting frame. The second guide mechanism includes a second guide rod and a second guide sleeve fitted on the outside of the second guide rod. The second guide rod is connected to the lifting frame, and the second guide sleeve is connected to the sliding frame.

[0028] The beneficial effect of adopting the above-mentioned further solution is that the second guide mechanism effectively limits the offset of the sliding frame in the moving direction, improves the stability of the sliding frame during the lifting process, reduces the radial force on the lifting cylinder, and makes the entire workpiece transfer device more stable and reliable during operation. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a schematic diagram of the placement clamp unit of this utility model;

[0031] Figure 3 This is a schematic diagram of the frame structure of this utility model;

[0032] Figure 4 This is a schematic diagram of the sliding lifting mechanism of this utility model;

[0033] In the diagram, 1. Frame; 101. Buffer fixture; 102. Fixture bearing surface; 103. Base frame; 104. Frame; 105. Sliding tilting platform; 2. Fixture placement unit; 201. Fixture placement; 202. Lifting cylinder; 203. Lifting bracket; 204. Connecting bracket; 205. Cylinder mounting plate; 206. First guide rod; 207. First guide sleeve; 3. Sliding lifting mechanism; 301. Lifting fixture; 302. Lifting frame; 303. Lifting cylinder; 304. Sliding cylinder; 305. Sliding frame; 306. Sliding guide rail; 307. Mounting bracket; 308. Limiting bracket; 309. First limiting block; 310. Second limiting block; 311. Buffer; 312. Second guide rod; 313. Second guide sleeve. Detailed Implementation

[0034] The principles and features of this utility model are described below with reference to examples. The examples are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0035] like Figures 1-4 As shown, a workpiece transfer device includes a frame 1, a placement fixture unit 2 disposed on the frame 1, and a sliding lifting mechanism 3. The frame 1 has fixture bearing surfaces 102 on its left and right sides, and the fixture bearing surfaces 102 are inclined with the front higher than the rear. The frame 1 is provided with multiple pairs of buffer fixtures 101 for positioning workpieces, and the multiple pairs of buffer fixtures 101 are evenly disposed on the fixture bearing surfaces 102.

[0036] The placement fixture unit 2 includes a pair of placement fixtures 201 for positioning workpieces and a lifting cylinder 202 for driving the placement fixtures 201 to lift. The workpiece on the buffer fixture 101 located at the foremost side can be transferred to the placement fixture 201 under the action of the sliding lifting mechanism 3. Under the action of the lifting cylinder 202, the workpiece on the placement fixture 201 can be raised to the gripping height of the picking position.

[0037] The sliding lifting mechanism 3 includes a lifting frame 302, multiple pairs of lifting clamps 301 for positioning workpieces mounted on the lifting frame 302, lifting cylinders 303 for driving the lifting frame 302 to rise and fall, and sliding cylinders 304 for driving the lifting frame 302 to move. The number of lifting clamps 301 is the same as the number of buffer clamps 101. The lifting cylinders 303 are mounted on the sliding frame 305, and the piston rod of the lifting cylinder 303 is connected to the lifting frame 302. The sliding frame 305 is slidably mounted on the frame 1. The sliding cylinders 304 are mounted on the frame 1, and the piston rod of the sliding cylinders 304 is connected to the sliding frame 305. Under the action of the sliding lifting mechanism 3, the lifting clamps 301 can lift the workpiece on the lower buffer clamp 101 and move it to the higher buffer clamp 101.

[0038] The frame 1 includes a base frame 103 and a frame 104 mounted on the base frame 103. The frame 104 is inclined at the front and lower at the rear on the base frame 103. The fixture bearing surfaces 102 are located on both sides of the frame 104. The frame 104 is also provided with a sliding tilting platform 105. The sliding frame 305 is mounted on the sliding tilting platform 105 via a sliding guide rail 306. The sliding tilting platform 105 on the frame 1 is used for positioning and mounting the sliding frame 305. In this way, the lifting frame 302 or the sliding frame 305 does not need to be tilted. The sliding frame 305 only needs to be mounted on the sliding tilting platform 105, ensuring that the movement of the sliding frame 305 on the sliding tilting platform 105 can meet the requirement that the workpiece on the low-position buffer fixture 101 can be transferred to the high-position buffer fixture 101. The frame 104 not only supports the buffer fixture 101, but also provides a transfer action space for the sliding lifting mechanism 3, which helps to stabilize and smooth the workpiece during the transfer process and meets the requirements of high efficiency and stability of the workpiece transfer device.

[0039] The lifting cylinder 202 is mounted on the cylinder mounting plate 205, which is connected to the frame 1 via a connecting bracket 204. A pair of placement clamps 201 are mounted on the lifting bracket 203, and the piston rod of the lifting cylinder 202 is connected to the lifting bracket 203. The cylinder mounting plate 205 is securely connected to the frame 1 via the connecting bracket 204, ensuring the installation and positioning of the placement clamp unit 2. The overall structure of the workpiece transfer device is compact, and the layout is more reasonable.

[0040] A first guide mechanism is also provided between the lifting bracket 203 and the mounting plate. The first guide mechanism includes a first guide rod 206 and a first guide sleeve 207 fitted on the outside of the first guide rod 206. The first guide sleeve 207 is disposed on the cylinder mounting plate 205. The first guide rod 206 is connected to the lifting bracket 203.

[0041] The workpiece can be transported to the placement fixture 201 under the action of the sliding lifting mechanism 3. The robot picks up the workpiece at a certain height. The placement fixture 201 and the workpiece are transported to the picking height of the robot's gripper under the action of the lifting cylinder 202. The setting of the first guiding mechanism can ensure the stability of the lifting bracket 203 during the lifting process, reduce the radial force on the lifting cylinder 202, and prevent it from shifting due to uneven force, thereby ensuring the accuracy and safety of workpiece transfer.

[0042] The sliding cylinder 304 is connected to the frame 1 via a mounting bracket 307. The piston rod of the sliding cylinder 304 is connected to the sliding frame 305. Through the extension and retraction of the sliding cylinder 304, the sliding frame 305 can be driven to move back and forth on the sliding guide rail 306, thereby realizing the transfer of the workpiece from the low-level buffer fixture 101 to the high-level buffer fixture 101 and the placement fixture 201.

[0043] The frame 1 is also provided with limiting mechanisms for restricting the forward and backward positions of the sliding frame 305. The limiting mechanisms can limit the forward movement of the sliding frame 305 to transport the workpiece and the backward movement to return to its original position, effectively preventing the sliding frame 305 from exceeding the predetermined movement range and ensuring the stability and safety of the workpiece transfer device.

[0044] The limiting mechanism includes a limiting bracket 308 and a first limiting block 309 disposed on the limiting bracket 308. The limiting bracket 308 is disposed on the frame 1. The first limiting block 309 is disposed in front of and behind the sliding frame 305 through the limiting bracket 308. It is used to contact the sliding frame 305 when it moves forward or backward to the required position, thereby limiting the movement of the sliding frame 305 and enabling the sliding frame 305 to stop at a precise position. This ensures that each sliding and lifting action of the sliding frame 305 can move the workpiece at the lower rear position forward to the buffer fixture 101 or the placement fixture 201 at the higher position, realizing the movement of the workpiece at the lower upper position to the higher lower position, thus improving the accuracy and reliability of workpiece transfer.

[0045] It also includes a buffer 311, which is disposed on the limiting bracket 308. The buffer 311 can play a buffering role when the sliding frame 305 moves to the front and rear limit positions, so as to avoid direct hard collision between the sliding frame 305 and the first limiting block 309, reduce impact and noise, and protect the sliding frame 305 from damage.

[0046] The limiting mechanism further includes a second limiting block 310, which is connected to the sliding frame 305 via a connecting block. When the sliding frame 305 moves to the front or rear limit position, the second limiting block 310 contacts the first limiting block 309, effectively limiting the front and rear positions of the sliding frame 305 and preventing the sliding frame 305 from directly contacting and colliding with the first limiting block 309, which would affect the service life of the sliding frame 305 over time.

[0047] A second guide mechanism is also provided between the sliding frame 305 and the lifting frame 302. The second guide mechanism includes a second guide rod 312 and a second guide sleeve 313 fitted outside the second guide rod 312. The second guide rod 312 is connected to the lifting frame 302, and the second guide sleeve 313 is connected to the sliding frame 305. The second guide mechanism effectively limits the offset of the sliding frame 305 in the moving direction, improves the stability of the sliding frame 305 during the lifting process, reduces the radial force on the lifting cylinder 303, and makes the entire workpiece transfer device more stable and reliable during operation.

[0048] The reciprocating rod feeding mechanism includes a fixed frame 104, buffer fixtures 101 (set to n groups with an interval of L between adjacent groups), a sliding mechanism, a lifting mechanism, and a placement fixture 201. The fixed frame 104 is installed on the ground, and the sliding mechanism and buffer fixtures 101 are mounted on it. The lifting mechanism is mounted on the sliding mechanism frame 104. One workpiece is placed on each fixture. When the workpiece is being conveyed, it is lifted after being placed at a low position. The lifting mechanism lifts the workpiece on the buffer fixture 101, and the sliding mechanism moves the lifting fixture with the workpiece a distance of L. The lifting mechanism then descends, and the workpiece falls onto the next buffer fixture 101. The sliding mechanism returns to its original position. At this time, the workpiece has been transported forward a distance of L. This action is repeated continuously until the workpiece is transported to the placement fixture 201. The placement fixture 201 is then transported to the gripper's pick-up height by a cylinder, completing the workpiece transfer from the hopper to the pick-up position. The distance between the placement fixture 201 and the foremost cache fixture 101 is the same as the distance between adjacent cache fixtures 101.

[0049] A sliding guide rail 306 is mounted on a frame 104. A slider that mates with the sliding guide rail 306 is located at the bottom of a sliding frame 305. A lifting mounting plate and a second guide sleeve 313 for positioning the lifting cylinder 303 are mounted on the sliding frame 305. A mounting bracket 307 is mounted on the frame 104 and connected to the sliding cylinder 304. The piston rod of the sliding cylinder 304 is connected to the sliding frame 305. The lifting mounting plate mounts the lifting cylinder 303, and the piston rod of the lifting cylinder 303 is connected to the lifting frame 302. The second limiting block 310 is mounted on the sliding frame 305 via a connecting block. The first limiting block 309 is mounted on the frame 104 via a limiting bracket 308. The second guide rod 312 passes through the guide sleeve and is mounted on the lifting frame 302. The lifting clamp 301 is mounted on the lifting frame 302. The sliding cylinder 304 drives the sliding frame 305 to move back and forth along the length of the sliding guide rail 306 via a slider. The sliding frame 305 drives the connected lifting components to move together. Under the action of the lifting cylinder 303 and the second guide rod 312, the lifting frame 302 and the lifting clamp 301 are lifted. The lifting motion is achieved by connecting bracket 204 mounted on frame 104, with cylinder mounting plate 205 and first guide sleeve 207 mounted on connecting bracket 204. Lifting cylinder 202 is mounted on connecting bracket 204 via cylinder mounting plate 205. The piston rod of lifting cylinder 202 is connected to lifting bracket 203. First guide rod 206 passes through first guide sleeve 207 and is mounted on lifting bracket 203. Placement clamp 201 is mounted on lifting bracket 203. Placement clamp 201 and lifting bracket 203 move upward and downward under the action of lifting cylinder 202 and first guide rod 206. The picking position is located in front of the loading position.

[0050] In use, the workpiece in the hopper can be placed on the buffer fixture 101 at the low loading position. The lifting cylinder 303 lifts the workpiece on the buffer fixture 101. The distance between adjacent buffer fixtures 101 is L. The sliding cylinder 304 drives the lifting cylinder 303 with the workpiece to move a distance L. The lifting cylinder 303 descends, and the workpiece falls on the next buffer fixture 101 located in front. The sliding cylinder 304 returns to its original position. At this time, the workpiece has been transported forward a distance L. Repeating the actions of loading at the low position, lifting, sliding forward and returning, multiple workpieces are gradually transported to higher positions. When the initial workpiece reaches the placement fixture 201 at the corresponding high picking position, the workpiece can be lifted and transported to the picking height of the robot's gripper under the action of the lifting cylinder 202. The robot's gripper can accurately grasp the workpiece and complete the transfer of the workpiece from the hopper to the picking position, thereby realizing the automated transfer of workpieces in the hopper.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A workpiece transfer device, characterized in that, The machine includes a frame (1), a fixture unit (2) mounted on the frame (1), and a sliding lifting mechanism (3). The frame (1) has fixture bearing surfaces (102) on its left and right sides respectively. The fixture bearing surfaces (102) are inclined with the front higher than the back. The frame (1) is provided with multiple pairs of buffer fixtures (101) for positioning workpieces. The multiple pairs of buffer fixtures (101) are evenly arranged on the fixture bearing surfaces (102). The placement fixture unit (2) includes a pair of placement fixtures (201) for positioning workpieces and a lifting cylinder (202) for driving the placement fixtures (201) to lift. The workpiece on the buffer fixture (101) located at the frontmost side can be transferred to the placement fixture (201) under the action of the sliding lifting mechanism (3). Under the action of the lifting cylinder (202), the workpiece on the placement fixture (201) can be raised to the gripping height of the picking position. The sliding lifting mechanism (3) includes a lifting frame (302), multiple pairs of lifting fixtures (301) for positioning workpieces mounted on the lifting frame (302), lifting cylinders (303) for driving the lifting frame (302) to rise and fall, and sliding cylinders (304) for driving the lifting frame (302) to move. The number of lifting fixtures (301) is the same as the number of buffer fixtures (101). The lifting cylinders (303) are mounted on the sliding frame (305). The piston rod of (303) is connected to the lifting frame (302), the sliding frame (305) is slidably mounted on the frame (1), the sliding cylinder (304) is mounted on the frame (1), the piston rod of the sliding cylinder (304) is connected to the sliding frame (305), and under the action of the sliding lifting mechanism (3), the lifting fixture (301) can lift the workpiece on the lower buffer fixture (101) and move it to the higher buffer fixture (101).

2. The workpiece transfer device according to claim 1, characterized in that, The frame (1) includes a base frame (103) and a frame (104) mounted on the base frame (103). The frame (104) is inclined on the base frame (103) with a front higher and a rear lower. The clamp bearing surface (102) is located on both sides of the frame (104). The frame (104) is also provided with a sliding tilting platform (105). The sliding frame (305) is mounted on the sliding tilting platform (105) via a sliding guide rail (306).

3. The workpiece transfer device according to claim 1, characterized in that, The lifting cylinder (202) is mounted on the cylinder mounting plate (205), which is connected to the frame (1) via a connecting bracket (204). A pair of placement clamps (201) are mounted on the lifting bracket (203), and the piston rod of the lifting cylinder (202) is connected to the lifting bracket (203).

4. The workpiece transfer device according to claim 3, characterized in that, A first guide mechanism is also provided between the lifting bracket (203) and the mounting plate. The first guide mechanism includes a first guide rod (206) and a first guide sleeve (207) fitted on the outside of the first guide rod (206). The first guide sleeve (207) is disposed on the cylinder mounting plate (205). The first guide rod (206) is connected to the lifting bracket (203).

5. The workpiece transfer device according to claim 1, characterized in that, The sliding cylinder (304) is connected to the frame (1) via a mounting bracket (307).

6. The workpiece transfer device according to any one of claims 1-5, characterized in that, The frame (1) is also provided with limiting mechanisms for limiting the forward and backward positions of the sliding frame (305).

7. The workpiece transfer device according to claim 6, characterized in that, The limiting mechanism includes a limiting bracket (308) and a first limiting block (309) disposed on the limiting bracket (308), wherein the limiting bracket (308) is disposed on the frame (1).

8. The workpiece transfer device according to claim 7, characterized in that, It also includes a buffer (311) disposed on the limiting bracket (308).

9. The workpiece transfer device according to claim 7, characterized in that, The limiting mechanism further includes a second limiting block (310), which is connected to the sliding frame (305) via a connecting block.

10. The workpiece transfer device according to any one of claims 1-5, characterized in that, A second guide mechanism is also provided between the sliding frame (305) and the lifting frame (302). The second guide mechanism includes a second guide rod (312) and a second guide sleeve (313) fitted on the outside of the second guide rod (312). The second guide rod (312) is connected to the lifting frame (302), and the second guide sleeve (313) is connected to the sliding frame (305).

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