Workpiece lifting attachment and method of use thereof

Abstract

The application relates to the field of production line lifting equipment, in particular to a workpiece lifting connecting device which is more convenient to operate and a use method thereof, which comprises a pair of clamping pieces and a driving mechanism, the driving mechanism is used for driving the clamping pieces to move synchronously and then realizing the connection or separation of the clamping pieces and the workpiece, the driving mechanism comprises a left gear plate and a right gear plate, the left gear plate and the right gear plate are rotatably arranged, the left gear plate and the right gear plate are meshed with each other, and the left gear plate is fixedly connected with one of the clamping pieces; the right gear plate is fixedly connected with the other clamping piece; the driving mechanism comprises an elastic reset mechanism which is connected with the clamping pieces; when external force is applied to the clamping pieces, the clamping pieces rotate around the corresponding left gear plate or right gear plate; when the external force disappears, the elastic reset mechanism drives the clamping pieces to rotate reversely around the left gear plate or the right gear plate and then realizes resetting. The application is especially suitable for workpiece lifting operation of large-scale production lines.

Description

Technical Field

[0001] This invention relates to the field of production line lifting equipment, and more particularly to a workpiece lifting connection device and its usage method. Background Technology

[0002] In large production lines, it is sometimes necessary to lift workpieces from one working height to another before proceeding to the next step. This requires the use of a production line lifting frame to raise the workpiece height. Production line lifting frames are typically quite large, resulting in various structures designed for different lifting scenarios. Among these, the workpiece lifting connection device, which enables rapid connection between the workpiece and the lifting frame, is a key component in achieving workpiece lifting.

[0003] Taking Chinese patent document CN215160527U as an example, it relates to an automatic grabbing and lifting device. This automatic grabbing and lifting device includes: a crossbeam; a lifting mechanism for driving the crossbeam to rise and fall; a turntable mounted at the center of the crossbeam via a pin; hooks, a pair of hooks symmetrically arranged on both sides of the turntable, with the top ends of the hooks hinged to the crossbeam; a connecting rod disposed between the hooks and the turntable; a drive rod, one end of which is fixedly connected to the pin, and the other end fitted with a counterweight; a workpiece disposed below the hooks, with a hanging ring on its top surface matching the hooks; and a stop block disposed on the top surface of the workpiece for driving the hooks to rotate when they rise. The rotation of the counterweight causes the hooks to switch between a clamped state and a disengaged state, and the stop block drives the hooks to rotate from the disengaged state to the clamped state. This automatic grabbing and lifting device requires either a rotating counterweight or a stop block to switch between the locked and unlocked states. In practice, the large weight of the counterweight and limited operating space make its rotation difficult, significantly increasing the operational complexity. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a workpiece lifting and connecting device and its usage method that are more convenient to operate.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a workpiece lifting and connecting device, including a pair of locking parts and a driving mechanism. The driving mechanism is used to drive the locking parts to move synchronously, thereby realizing the connection or separation of the locking parts and the workpiece. The driving mechanism includes a left gear disk and a right gear disk, which are rotatably arranged and mesh with each other. The left gear disk is fixedly connected to one of the locking parts, and the right gear disk is fixedly connected to the other locking part. The drive mechanism includes an elastic reset mechanism, which is connected to a snap-fit ​​component. When an external force is applied to the snap-fit ​​component, the snap-fit ​​component rotates around the corresponding left or right gear disk; when the external force disappears, the elastic reset mechanism drives the snap-fit ​​component to rotate in the opposite direction around the left or right gear disk, thereby achieving reset.

[0006] Furthermore, the locking component includes a locking lever and a locking hook disposed on the locking lever, with a left gear disk disposed at the end of one of the locking levers and a right gear disk disposed at the end of the other locking lever.

[0007] Furthermore, the elastic reset mechanism includes a reset spring, a limiting ear plate, and a rotating shaft. One end of the rotating shaft is hinged to the frame of the drive mechanism, the reset spring is sleeved on the rotating shaft, the limiting ear plate is fixedly mounted on the lever, the rotating shaft passes through a through hole on the limiting ear plate, one end of the reset spring is fixedly mounted on the limiting ear plate, and the other end of the reset spring is fixedly mounted on the rotating shaft.

[0008] Furthermore, the through hole on the limiting ear plate is shaped like an oblong hole, and a gap is provided between the inner wall of the oblong hole and the outer wall of the rotating shaft.

[0009] Furthermore, the elastic reset mechanism includes a left reset device and a right reset device, with the left reset device connected to one of the latching components and the right reset device connected to the other latching component.

[0010] Furthermore, the device includes a locking hook assembly, which includes a locking hook, and a latching member includes a pawl. When the latching member rotates synchronously to engage the locking hook and the pawl, the position of the latching member is locked by the locking hook assembly, preventing the latching member from being reset by the elastic reset mechanism.

[0011] Furthermore, the locking hook assembly includes a slot and a lever slidably disposed within the slot. The locking hook is fixedly disposed on the lever, and when the lever slides along the slot, the locking hook separates from the pawl.

[0012] Furthermore, the locking hook assembly includes a base, a spring, and a locking hook shaft. The locking hook shaft is fixedly connected to the lever and slidably mounted on the base. The spring is sleeved on the locking hook shaft, with one end of the spring fixedly connected to the locking hook shaft and the other end of the spring fixedly connected to the base.

[0013] Furthermore, the locking hook includes a left locking hook and a right locking hook, and the hook claw includes a left hook claw and a right hook claw. The left hook claw is set on one of the locking parts, and the right hook claw is set on the other locking part. The left locking hook is engaged with the left hook claw, and the right locking hook is engaged with the right hook claw.

[0014] The method of using the workpiece lifting and connecting device includes the following steps: a. First, fix the position of the workpiece, and use the motor to lower the workpiece lifting and connecting device so that the locking part of the workpiece lifting and connecting device is locked with the workpiece; b. The motor rotates in the reverse direction, thereby lifting the workpiece lifting connection device and the workpiece; c. After the workpiece is lifted to the predetermined position and fixed, the motor lowers the workpiece lifting and connecting device. A pair of fasteners are set on the path of the motor lowering the workpiece lifting and connecting device, and a pair of snap-fit ​​pieces are set between the fasteners. As the motor lowers the workpiece lifting and connecting device, the fasteners drive the snap-fit ​​pieces to rotate synchronously until the locking hook and the claw are engaged. Then, the motor lifts the workpiece lifting and connecting device, thereby removing the workpiece lifting and connecting device from the workpiece. d. A lever is provided on the path through which the motor lifts the workpiece lifting connection device from the workpiece. The lever allows the lever frame to slide relative to each other along the direction of the slot, causing the locking hook and the claw to separate, thereby releasing the position lock of the clamping part, so that the workpiece lifting connection device is reset to the initial state by the elastic reset mechanism.

[0015] The beneficial effects of this invention are: I. Synchronous movement between a pair of locking components is achieved through the meshing of the left and right gear discs. This synchronous movement of the left and right gear discs enables the synchronized reduction and increase of the distance between the locking components. Specifically, in practical use, applying an external force to one of the locking components achieves synchronous movement between the two components. When resetting the pair of locking components is required, simply removing the external force allows the locking components to reset under the drive of the elastic reset mechanism. Compared to existing methods that require a rotating counterweight or a stop block, this solution is more convenient and easier to operate, significantly improving operational efficiency in production.

[0016] Second, by incorporating a locking hook assembly, when the workpiece lifting and connecting device needs to be removed from the workpiece, only external force needs to be applied to cause a pair of locking parts to rotate synchronously until they engage with the locking hook and pawl, thus locking the locking parts in place. At this point, even without external force, the elastic reset mechanism cannot reset the locking parts, allowing them to be easily removed, greatly improving ease of use and operability in confined operating environments.

[0017] 3. After the workpiece is lifted to the predetermined position and fixed, the motor lowers the workpiece lifting and connecting device. A pair of fasteners are installed along the path of the motor lowering the workpiece lifting and connecting device. After a pair of locking parts are engaged between the fasteners, as the motor continues to lower the workpiece lifting and connecting device, the fasteners drive the locking parts to rotate synchronously until the locking hook and claw are engaged. Based on this, a lever is installed along the path of the motor removing the workpiece lifting and connecting device from the workpiece. As the workpiece lifting and connecting device passes, the lever obstructs the lever on the workpiece lifting and connecting device, causing the lever to slide relative to the slot, thereby separating the locking hook and claw. Subsequently, the workpiece lifting and connecting device is reset to its initial state by the elastic reset mechanism. In this scheme, the connection between the workpiece lifting and connecting device and the workpiece, as well as the self-locking and unlocking of the locking parts in the workpiece lifting and connecting device, are achieved through the state changes of the device itself, without relying on other components. The entire operation only requires the installation of the corresponding fasteners and levers along the device's movement path, simplifying processing, controlling costs, and effectively improving the efficiency of workpiece transportation.

[0018] This invention is particularly suitable for workpiece lifting operations in large production lines. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an embodiment of the workpiece and the lifting structure provided on the side wall of the workpiece according to the present invention.

[0020] Figure 2 yes Figure 1 A magnified view from direction A.

[0021] Figure 3 This is a schematic diagram of the workpiece lifting and connecting device installed on the side wall of the workpiece.

[0022] Figure 4 This is a schematic diagram of the inside of the workpiece lifting and connecting device. At this time, the locking hook and the claw are in a hooking engagement state, and the return spring is in a compressed state.

[0023] Figure 5 yes Figure 3 A magnified view in direction B.

[0024] Figure 6 This is a schematic diagram of the inside of the workpiece lifting and connecting device. At this time, the locking hook and the claw are in a separated state, and the clamping part is in the initial state.

[0025] Figure 7 This is a schematic diagram of an embodiment of the workpiece lifting and connecting device, including the slot and the lever inside the slot.

[0026] Figure 8 This is a schematic diagram of an embodiment of the locking hook assembly.

[0027] Figure 9 This is a schematic diagram of the locking hook assembly after the lever has been removed.

[0028] Figure 10 This is a schematic diagram showing the lock hook and pawl in a hooked engagement state.

[0029] Figure 11 This is a schematic diagram showing the lock hook and pawl in a separated state.

[0030] The components in the diagram are labeled as follows: Lifting structure 1, workpiece 11, bayonet structure 12, workpiece lifting connection device 2, snap-fit ​​component 21, right locking hook 210, left hook claw 211, right hook claw 212, snap-fit ​​hook 213, left gear disk 22, right gear disk 23, lifting roller 24, mounting base 25, frame 251, bearing base plate 252, base 253, slot 254, mounting shaft 255, rotating shaft 257, locking hook assembly 26, locking hook shaft 261, spring 262, lever 263, limit baffle 264, first limit pin 265, second limit pin 266, left reset device 27, limit lug 272, rotating shaft 273, limit nut 274, locking pin 275, right reset device 28, left locking hook 29. Detailed Implementation

[0031] The invention will be further described below with reference to the accompanying drawings.

[0032] Figure 1 and Figure 2 The diagram shows a lifting structure 1 and a bayonet structure 12 mounted on the workpiece 11. In this embodiment, the workpiece 11 can be a rectangular frame structure. Lifting structures 1 are mounted on the side walls of the left and right sides of the workpiece 11. The lifting structures 1 are fixedly mounted on the side walls of the workpiece 11. A C-shaped bayonet structure 12 is provided at the bottom of each lifting structure 1, with the opening of the C-shaped bayonet structure 12 facing downwards. Each lifting structure 1 has two bayonet structures 12 at its bottom, thus allowing it to engage with... Figure 3 The snap hook 213 at the bottom of the snap-fit ​​component 21 forms a good hook-fitting effect.

[0033] Figure 3 The diagram illustrates the hook-and-loop connection between the workpiece lifting connection device 2 and the lifting structure 1. The workpiece lifting connection device 2 is positioned on the side walls of the workpiece 11 on both sides, and is located above the lifting structure 1. A pair of locking members 21 have downward-extending locking rods, each with a locking hook 213 at its bottom. Specifically, the locking hook 213 of the left-side locking member 21 is bent to the left to form a hook-like structure, and the locking hook 213 of the right-side locking member 21 is bent to the right to form a hook-like structure, thus facilitating the hook-and-loop connection with the corresponding lifting structure 1.

[0034] Figures 4 to 11The diagram shown is a schematic representation of the specific structure of the workpiece lifting and connecting device 2. Figure 4 and Figure 7 As shown, the mounting base 25 of the workpiece lifting connecting device 2 includes a rectangular frame 251 and a rectangular supporting base plate 252. The frame 251 and the supporting base plate 252 are fixedly connected to form the basic frame of the workpiece lifting connecting device 2. The supporting base plate 252 has two through holes, and mounting shafts 255 are fixedly installed in each of the two through holes. The left gear disk 22 and the right gear disk 23 are rotatably mounted on the two mounting shafts 255, respectively. The left gear disk 22 and the right gear disk 23 are meshed together, allowing them to rotate synchronously around their respective mounting shafts 255, but in opposite directions. Figure 4 As shown, the left gear disk 22 is fixedly connected to the top of the latching rod of the left-side latching member 21, and the right gear disk 23 is fixedly connected to the top of the latching rod of the right-side latching member 21. This allows the left-side and right-side latching members 21 to rotate synchronously, but in opposite directions. This results in an increase or decrease in the distance between the latching hooks 213 at the bottom of the left-side and right-side latching members 21. The workpiece lifting connection device 2 has a lifting roller 24 at its top. The rotation axis of the lifting roller 24 is horizontal. One end of the track is wound around the lifting roller 24, and the other end is connected to the output shaft of the motor. The rotation of the motor causes the track to move up and down, thereby lifting or lowering the workpiece lifting connection device 2. In use, the workpiece lifting connection device 2 is connected to the lifting structure 1 of the workpiece 11 through the snap-fit ​​21. The motor drives the track to rise or fall, thereby realizing the lifting and hoisting of the workpiece 11.

[0035] Figure 5 The illustration shows an embodiment of the elastic reset mechanism. For example... Figure 4 and Figure 5 As shown, the left-side latching member 21 is connected to the left reset device 27, and the right-side latching member 21 is connected to the right reset device 28. Taking the left-side latching member 21 and the left reset device 27 as an example, as... Figure 5As shown, the left end of the rotating shaft 273 is hinged to the frame 251 via the rotating shaft pivot 257. A return spring is sleeved on the rotating shaft 273. A limiting ear plate 272 is fixedly mounted on the locking rod of the left-side locking member 21. The rotating shaft 273 passes through a through hole in the limiting ear plate 272. Specifically, the through hole in the limiting ear plate 272 is an oblong hole. A gap is provided between the inner wall of the oblong hole and the outer wall of the rotating shaft. This gap allows the rotating shaft 273 to have room to move within the oblong hole when the left-side locking member 21 rotates, thus enabling adjustment. One end of the return spring is fixedly mounted on the limiting ear plate 272, and the other end is fixedly mounted on the limiting nut 274. The limiting nut 274 is mounted on the rotating shaft 273, and a locking pin 275 fixedly mounted on the rotating shaft 273 prevents the limiting nut 274 from slipping off the rotating shaft 273. In this embodiment, when the locking member 21 rotates to the right, the limiting lug 272 compresses the return spring. When the external force disappears, the return spring returns to its natural extension state, thereby driving the locking member 21 to rotate to the left. After the return spring returns to its original position, the left and right locking members 21 move from... Figure 4 The positions shown each rotate to Figure 6 The initial state is shown. It can be determined that the left and right card connectors 21 are in... Figure 6 The initial state shown is the position where the left and right snap-fit ​​pieces 21 are hooked and engaged with their respective lifting structure pieces 1.

[0036] and Figure 4 , Figures 6 to 11 The diagram shows an embodiment of the locking hook assembly 26. A rectangular slot 254 is provided on the supporting base plate 252, with its long side positioned vertically. (See diagram for reference.) Figure 8 and Figure 9 As shown, the locking hook assembly 26 mainly includes a lever 263, a locking hook shaft 261, a base 253, and a spring 262. The lever 263 has a bent L-shaped structure, as shown... Figure 7 As shown, one end of the lever 263 passes through the slot 254 and extends to the back of the workpiece lifting connecting device 2. The lever 263 can slide up and down along the long side of the slot 254. The other end of the lever 263 is fixedly connected to one end of the locking hook shaft 261. A left locking hook 29 and a right locking hook 210 are respectively provided on the left and right sides of the locking hook shaft 261 near the lever 263. The base 253 is U-shaped, and the locking hook shaft 261 passes through both ends of the base 253. The spring 262, which is sleeved on the locking hook shaft 261, is located between the left and right ends of the base 253. Figure 8 and Figure 9As shown, a first limiting pin 265 is provided on the left side of the right-end bent portion of the U-shaped base 253, and a second limiting pin 266 is provided on the right side of the right-end bent portion of the U-shaped base 253. Both the first limiting pin 265 and the second limiting pin 266 are fixedly mounted on the hook shaft 261. Furthermore, a limiting baffle 264 is provided between the first limiting pin 265 and the spring 262, and the limiting baffle 264 is sleeved on the hook shaft 261. The hook assembly 26 is fixedly mounted on the supporting base plate 252 via the base 253. In actual use, pressing the lever 263 by hand causes the lever 263 to slide along the slot 254. The sliding lever 263 drives the hook shaft 261 and the limiting baffle 264 to compress the spring 262. Naturally, the left hook 29 and the right hook 210 also slide in the same direction as the lever 263. When released, the left locking hook 29, the right locking hook 210, the lever 263, and the locking hook shaft 261 will reset under the elastic force of the spring 262, i.e., reverse reset.

[0037] like Figures 1 to 11 As shown, in actual use, a workpiece lifting connection device 2 is first prepared on both the left and right sides of the workpiece 11, with the workpiece lifting connection device 2 located above the corresponding lifting structure 1. Subsequently, the motor rotates to extend the track, thereby causing the workpiece lifting connection device 2 below the track to move downward under its own weight. When the latching hook 213 of the latching member 21 contacts the corresponding latching structure 12 on the lifting structure 1, since the distance between the two latching structures 12 is less than the initial distance between the two latching hooks 213, as the workpiece lifting connection device 2 continues to move downward, the two latching structures 12 apply an external force to the latching hooks 213 of the latching member 21. This external force causes the two latching members 21 to rotate synchronously. The result of this rotation is a reduction in the distance between the latching hooks 213 of the two latching members 21. Because the distance between the two latching hooks 213 is reduced, the latching hooks 213 can continue to move downward until they reach below the corresponding latching structure 12. It should be noted that during this process, because the reduction in the distance between the two locking hooks 213 is relatively small, the rotation angles of the left hook 211 and the right hook 212 are also relatively small. This results in the left hook 211 always being located outside the hook portion of the left locking hook 29, and the right hook 212 always being located outside the hook portion of the right locking hook 210, i.e. Figure 10As shown, at this time, the left hook 211 does not form a hook engagement with the left locking hook 29, and the right hook 212 does not form a hook engagement with the right locking hook 210. At this time, as the locking hook 213 moves downward completely to below the locking structure 12, the locking structure 12 no longer applies external force to the locking hook 213 and the locking member 21. At this time, the locking member 21 is reset under the action of its corresponding left reset device 27 and right reset device 28, so that the distance between the locking hooks 213 of the two locking members 21 increases and returns to the initial distance between the two locking hooks 213. At this time, the locking hooks 213 of the two locking members 21 are located below the C-shaped opening of the locking structure 12. When the track moves upward and lifts the workpiece lifting connection device 2, the hook engagement between the locking hooks 213 at the bottom of the two locking members 21 and the corresponding locking structure 12 can be realized, thereby lifting the workpiece 11.

[0038] After the workpiece 11 is hoisted to a predetermined height, it is fixed on a stable support surface. For example, the workpiece 11 can be placed in a workpiece mounting frame to secure it. Subsequently, the motor lowers the track, causing the workpiece lifting connection device 2 to lower synchronously, which in turn lowers the locking hooks 213 of the two locking components 21 together. Along this lowering path, a pair of fasteners are provided. These fasteners can be fixed posts on the surrounding support, with the spacing between the posts being smaller than the spacing between the two locking structures 12. Preferably, the fasteners can be located on the workpiece mounting frame of the workpiece 11. As the two locking hooks 213 are lowered, similar to the principle of the locking structure 12 driving the locking hooks 213 to rotate, the pair of fixed posts drive the corresponding locking hooks 213 to rotate. However, at this point, since the distance between the pair of fixed post brackets is less than the distance between the two aforementioned latch structures 12, the pair of fixed posts can drive the distance between the two latching hooks 213 to a smaller extent, ultimately resulting in the locking hook and the claw engaging, that is, driving the distance between the two latching hooks 213 to a smaller extent. Figure 10 The left hook 211 and the left locking hook 29 are engaged, and the right hook 212 and the right locking hook 210 are engaged. Subsequently, even if the two locking hooks 213 separate from the aforementioned fixed post, the reset spring force of the left reset device 27 and the right reset device 28 cannot reset the two locking parts 21. At this point, the workpiece lifting connection device 2 can be easily removed from the workpiece 11.

[0039] After removing the workpiece lifting connection device 2, if it is necessary to restore the workpiece lifting connection device 2 to its original position... Figure 6In the initial state shown, where the return spring is in its natural extension state, a lever can be installed along the path where the motor removes the workpiece lifting connecting device 2 from the workpiece 11. The lever can be mounted on a surrounding support. When the workpiece lifting connecting device 2 is removed from the workpiece 11 and passes the lever, the lever contacts the lever frame 263 and prevents the lever frame 263 from continuing to move with the workpiece lifting connecting device 2. Figure 7 As shown, this causes the lever 263 to slide downward along the slot 254, making Figure 6 The left locking hook 29 and the right locking hook 210 move downwards together, thereby separating the left locking hook 29 from the left pawl 211 and the right locking hook 210 from the right pawl 212. Subsequently, the reset springs of the left reset device 27 and the right reset device 28 drive the two latching hooks 213 to reset in the direction of increasing spacing until they are reset to their original positions. Figure 6 The state shown is the reset to the initial state. Figure 6 In the initial state shown, the left pawl 211 is located outside the hook of the left locking hook 29, the right pawl 212 is located outside the hook of the right locking hook 210, and the return spring is in a naturally extended state.

Claims

1. A workpiece lifting and connecting device, comprising a pair of snap-fit ​​members (21) and a driving mechanism, wherein the driving mechanism is used to drive the snap-fit ​​members (21) to move synchronously, thereby realizing the connection or separation of the snap-fit ​​members (21) and the workpiece (11), characterized in that: The drive mechanism includes a left gear disk (22) and a right gear disk (23), which are rotatable and mesh with each other. The left gear disk (22) is fixedly connected to one of the snap-fit ​​parts (21), and the right gear disk (23) is fixedly connected to the other snap-fit ​​part (21). The drive mechanism includes an elastic reset mechanism, which is connected to the snap-fit ​​component (21); When an external force is applied to the snap-fit ​​(21), the snap-fit ​​(21) rotates around the corresponding left gear disk (22) or right gear disk (23); when the external force disappears, the elastic reset mechanism drives the snap-fit ​​(21) to rotate in the opposite direction around the left gear disk (22) or right gear disk (23) to achieve reset.

2. The workpiece lifting and connecting device as described in claim 1, characterized in that: The snap-fit ​​component (21) includes a snap-fit ​​lever and a snap-fit ​​hook (213) disposed on the snap-fit ​​lever. A left gear disk (22) is disposed at the end of one of the snap-fit ​​levers, and a right gear disk (23) is disposed at the end of the other snap-fit ​​lever.

3. The workpiece lifting and connecting device as described in claim 2, characterized in that: The elastic reset mechanism includes a reset spring, a limiting ear plate (272), and a rotating shaft (273). One end of the rotating shaft (273) is hinged to the frame (251) of the drive mechanism. The reset spring is sleeved on the rotating shaft (273). The limiting ear plate (272) is fixedly mounted on the lever. The rotating shaft (273) passes through the through hole on the limiting ear plate (272). One end of the reset spring is fixedly mounted on the limiting ear plate (272), and the other end of the reset spring is fixedly mounted on the rotating shaft (273).

4. The workpiece lifting and connecting device as described in claim 3, characterized in that: The through hole on the limiting ear plate (272) is shaped like an oblong hole, and there is a gap between the inner wall of the oblong hole and the outer wall of the rotating shaft (273).

5. The workpiece lifting and connecting device as described in claim 4, characterized in that: The elastic reset mechanism includes a left reset device (27) and a right reset device (28). The left reset device (27) is connected to one of the snap-fit ​​pieces (21), and the right reset device (28) is connected to the other snap-fit ​​piece (21).

6. The workpiece lifting and connecting device as described in any one of claims 1 to 5, characterized in that: The device includes a locking hook assembly (26), which includes a locking hook, and a latching member (21) which includes a pawl. When the latching member (21) rotates synchronously to engage the locking hook and the pawl, the position of the latching member (21) is locked by the locking hook assembly (26), preventing the latching member (21) from being reset by the elastic reset mechanism.

7. The workpiece lifting and connecting device as described in claim 6, characterized in that: The locking hook assembly (26) includes a slot (254) and a lever (263) slidably disposed in the slot (254). The locking hook is fixedly disposed on the lever (263). When the lever (263) slides along the slot (254), the locking hook separates from the claw.

8. The workpiece lifting and connecting device as described in claim 7, characterized in that: The locking hook assembly (26) includes a base (253), a spring (262) and a locking hook shaft (261). The locking hook shaft (261) is fixedly connected to the lever (263). The locking hook shaft (261) is slidably disposed on the base (253). The spring (262) is sleeved on the locking hook shaft (261). One end of the spring (262) is fixedly connected to the locking hook shaft (261), and the other end of the spring (262) is fixedly connected to the base (253).

9. The workpiece lifting and connecting device as described in claim 7, characterized in that: The locking hook includes a left locking hook (29) and a right locking hook (210), and the hook claw includes a left hook claw (211) and a right hook claw (212). The left hook claw (211) is set on one of the snap-fit ​​parts (21), and the right hook claw (212) is set on the other snap-fit ​​part (21). The left locking hook (29) is hooked and engaged with the left hook claw (211), and the right locking hook (210) is hooked and engaged with the right hook claw (212).

10. A method for using a workpiece lifting and connecting device, comprising the workpiece lifting and connecting device as described in any one of claims 1 to 9, characterized in that, Includes the following steps: a. First, fix the position of the workpiece (11), and use the motor to lower the workpiece lifting and connecting device (2) so that the snap-fit ​​part (21) of the workpiece lifting and connecting device (2) is snapped into the workpiece (11); b. The motor rotates in the opposite direction to lift the workpiece lifting connection device (2) and the workpiece (11); c. After the workpiece (11) is lifted to the predetermined position and fixed, the motor lowers the workpiece lifting connection device (2). A pair of fasteners are set on the path of the motor lowering the workpiece lifting connection device (2), and a pair of snap-fit ​​pieces (21) are set between the fasteners. As the motor lowers the workpiece lifting connection device (2), the fasteners drive the snap-fit ​​pieces (21) to rotate synchronously to the state of hook engagement with the hook and claw. Subsequently, the motor lifts the workpiece lifting connection device (2), thereby removing the workpiece lifting connection device (2) from the workpiece (11); d. A lever is provided on the path through which the motor takes the workpiece lifting and connecting device (2) out of the workpiece (11). The lever causes the lever frame (263) to slide relative to the direction of the slot (254), so that the locking hook and the claw are separated, thereby releasing the position lock of the snap-fit ​​part (21) and so that the workpiece lifting and connecting device (2) is reset to the initial state by the elastic reset mechanism.

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