Automatic lifting appliance

Abstract

The invention relates to the technical field of lifting appliances, and particularly discloses an automatic lifting appliance which comprises a centering shaft, a rotary unlocking piece, a middle supporting plate, lifting hooks and a connecting rod, the centering shaft is arranged on the middle supporting plate in a penetrating mode and connected with the middle supporting plate through the rotary unlocking piece, and the multiple lifting hooks are arranged below the middle supporting plate at intervals in the circumferential direction of the middle supporting plate; the lower end of the centering shaft is connected with the middles of the multiple lifting hooks through connecting rods, when the centering shaft of the middle supporting plate descends to the bottom to abut against the top of a workpiece, the multiple lifting hooks can stretch into the workpiece, and when the centering shaft continues to descend to the preset height, the rotary unlocking piece can abut against the middle supporting plate, and the lifting hooks can stretch into the workpiece. And after the centering shaft is separated from the middle supporting plate, the centering shaft ascends to drive the multiple lifting hooks to expand outwards in the radial direction so as to clamp a workpiece, lifting hook driving pieces are saved, automatic clamping of the lifting appliance can be achieved, and the lifting efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting tools, and particularly to an automatic lifting tool. Background Art

[0002] In the field of metal hot working, the heat treatment process changes the structure and properties of materials through heating, heat preservation, and cooling. Among them, annular workpieces (such as gears, bearing sleeves, etc.) often need to be transferred from a high-temperature heating furnace with the help of special lifting tools. Traditional lifting tools generally use power drive components such as hydraulic cylinders and pneumatic devices to realize workpiece clamping and lifting. However, such devices have significant defects under high-temperature working conditions: the power components are prone to deformation, jamming, or even damage due to thermal expansion, lubrication failure, or mechanical stress; if the workpiece accidentally falls off, the high-speed falling workpiece not only threatens the safety of operators but may also cause equipment damage accidents. In addition, traditional lifting tools rely on manual operation, with high labor intensity and long lifting process time, resulting in a large amount of heat loss in the furnace, reducing energy utilization efficiency, and affecting production efficiency. Summary of the Invention

[0003] The present invention is made in consideration of the foregoing problems. The purpose of the invention is to provide an automatic lifting tool that can realize workpiece clamping without a power drive component, reduce the damage rate of the lifting tool, and improve the lifting efficiency.

[0004] To achieve the above object, the present invention provides an automatic lifting tool for lifting a workpiece, including:

[0005] A middle support plate, the bottom of which is provided with an abutting portion adapted to the top of the workpiece;

[0006] A hook, a plurality of the hooks are arranged at intervals along the circumference of the middle support plate below the middle support plate, and the lower ends of the plurality of hooks are all hinged to the middle support plate;

[0007] A centering shaft, which is penetrated through the middle support plate;

[0008] A connecting rod, a plurality of the connecting rods are all located between the centering shaft and the plurality of hooks, one ends of the plurality of connecting rods are all hinged to the lower end of the centering shaft, the other ends of the plurality of connecting rods are respectively hinged to the plurality of hooks, and the angles between the plurality of connecting rods and the centering shaft are all greater than 0;

[0009] A rotary unlocking member, which is arranged on the centering shaft, the rotary unlocking member includes a locking member, and the locking member can be connected to the middle support plate to connect the centering shaft and the middle support plate;

[0010] The locking member has a rotation center line, and the locking member can rotate around the rotation center line to realize connection or separation from the middle support plate;

[0011] After the abutting part abuts against the top of the workpiece, the bottom of the locking part can abut against the top of the intermediate support plate and can rotate to separate from the intermediate support plate.

[0012] For an automatic lifting tool as described above, the rotation unlocking part further includes a rotation switch. The locking part is set as a locking ring. The rotation switch is fixedly connected to the centering shaft and can drive the locking ring to rotate. A locking buckle is arranged at the top of the intermediate support plate. The locking ring can be inserted below the locking buckle to connect the centering shaft and the intermediate support plate.

[0013] When the locking ring abuts against the top of the intermediate support plate, the rotation switch can drive the locking ring to rotate a preset angle to unlock the locking ring and the locking buckle.

[0014] For an automatic lifting tool as described above, the locking ring includes a connecting part arranged in the vertical direction and a locking part arranged in the horizontal direction. The connecting part is vertically connected to the middle of the locking part. A rectangular hole is formed in the middle of the locking buckle. The width of the rectangular hole is greater than the width of the locking part and less than the length of the locking part. The locking part can pass through the rectangular hole and abut against the bottom of the locking buckle.

[0015] For an automatic lifting tool as described above, a contact sensor is arranged at the bottom of the locking part. The contact sensor is electrically connected to the rotation switch. When the contact sensor abuts against the intermediate support plate, the rotation switch can drive the locking ring to rotate a preset angle.

[0016] For an automatic lifting tool as described above, the locking part includes a locking ring. The locking ring is fixedly connected to the centering shaft. A locking buckle is arranged at the top of the intermediate support plate. The locking ring can be inserted below the locking buckle to connect the centering shaft and the intermediate support plate.

[0017] When the locking ring abuts against the top of the intermediate support plate, the locking ring can rotate a preset angle to unlock the locking ring and the locking buckle.

[0018] For an automatic lifting tool as described above, the locking ring includes a connecting part arranged in the vertical direction and a locking part arranged in the horizontal direction. The connecting part is vertically connected to the middle of the locking part. A rectangular hole is formed in the middle of the locking buckle. The width of the rectangular hole is greater than the width of the locking part and less than the length of the locking part. The locking part can pass through the rectangular hole and abut against the bottom of the locking buckle.

[0019] An arc-shaped abutting part is arranged on the locking part, and an arc-shaped driving part is arranged on the intermediate support plate. When the locking part moves towards the top of the intermediate support plate, the arc-shaped driving part can abut against the arc-shaped abutting part and drive the locking part to rotate a preset angle.

[0020] An automatic sling as described above further includes a lifting ring, the lifting ring is fixed to the upper end of the centering shaft, two clamping plates are provided at the upper end of the centering shaft, and the two clamping plates are respectively clamped on both sides of the lifting ring to limit the rotation of the centering shaft.

[0021] An automatic sling as described above, the abutting portion is provided as a support arm, at least three support arms are arranged at intervals along the circumferential direction of the middle support plate below the middle support plate, and the lower end of the support arm is provided with an abutting surface adapted to the shape of the top surface of the workpiece.

[0022] An automatic sling as described above further includes a hollow sliding sleeve, the hollow sliding sleeve is fixed to the bottom of the middle support plate, the centering shaft is arranged in the hollow sliding sleeve, and the middle part of the support arm is connected to the hollow sliding sleeve through a reinforcing rib.

[0023] An automatic sling as described above, a connecting seat is provided at the lower end of the centering shaft, both the connecting rod and the hook are provided in three numbers, one ends of the three connecting rods are all hinged to the connecting seat, and the other ends of the three connecting rods are respectively hinged to the middle parts of the three hooks.

[0024] The present invention has the following beneficial effects:

[0025] 1. Since the centering shaft can be connected to the middle support plate through the rotation unlocking member, when the centering shaft is lifted by an external device, multiple hooks can be kept in follow-up through the middle support plate, and the positions between the centering shaft and the multiple hooks will not change. After the middle support plate abuts against the top of the workpiece, under the action of gravity, the centering shaft continues to move downward. At this time, the rotation unlocking member can move downward together with the centering shaft. When the locking member of the rotation unlocking member abuts against the top of the middle support plate, the locking member can rotate to realize the separation of the centering shaft from the middle support plate. After the separation, the centering shaft can move up and down relative to the middle support plate, that is, move up and down relative to the hook. When the centering shaft moves upward relative to the hook, the centering shaft can drive multiple hooks to expand radially outward through the connecting rod and clamp the workpiece from the inside of the workpiece. It can realize the connection and separation of the middle support plate through the ingenious rotation unlocking member, and can realize the drive of the hook through the connecting rod structure, which can save the driver, reduce the cost, and at the same time, when lifting the heat-treated workpiece, it can effectively avoid damage to the driving member;

[0026] 2. The rotary unlocking member includes a lock ring and a lock catch. The lock ring is fixedly connected to the centering shaft, and the lock catch is fixed to the top of the intermediate support plate. The lock ring is integrally formed into a T-shaped structure, and a rectangular hole is provided on the lock catch. By rotating the lock ring, its bottom can be adapted to or cross-arranged with the rectangular hole. When they are adapted, the lock ring can be disengaged from the lock catch, and thus the centering shaft can be disengaged from the intermediate support plate. When they are crossed, the lock ring cannot be disengaged from the lock catch, achieving the purpose of connecting the centering shaft and the intermediate support plate. Its structure is simple and the operation is convenient.

[0027] 3. Since the movement range of the centering shaft is basically unrestricted after it is separated from the intermediate support plate, it can drive the hook to expand to a larger diameter range, which can improve the applicability of the lifting tool. Description of the Drawings

[0028] Figure 1 is the overall structural schematic diagram of the first embodiment;

[0029] Figure 2 is the assembly schematic diagram of the centering shaft, intermediate support plate and hook of the first embodiment;

[0030] Figure 3 is the assembly schematic diagram of the tool shank of the first embodiment;

[0031] Figure 4 is the structural schematic diagram of the lock ring of the first embodiment.

[0032] In the figure:

[0033] 1. Centering shaft; 11. Clamping plate; 12. Connecting seat; 2. Rotary unlocking member; 21. Rotary switch; 22. Lock ring; 221. Connecting portion; 222. Locking portion; 3. Intermediate support plate; 31. Lock catch; 311. Rectangular hole; 32. Support arm; 321. Reinforcing rib; 4. Hook; 5. Connecting rod; 6. Hoisting ring; 7. Hollow sliding sleeve. Detailed Embodiments

[0034] The following are specific embodiments of the present invention in combination with the drawings, and the technical solutions of the present invention will be further described, but the invention is not limited to these embodiments.

[0035] First Embodiment

[0036] As Figures 1-4 shown, an automatic lifting tool includes a centering shaft 1, a rotary unlocking member 2, an intermediate support plate 3, a hook 4 and a connecting rod 5.

[0037] Among them, a butt joint portion adapted to the top of the workpiece is provided at the bottom of the middle support plate 3, and a plurality of hooks 4 are arranged at intervals along the circumferential direction of the middle support plate 3 below the middle support plate 3, and the upper ends of the plurality of hooks 4 are all hinged to the middle support plate 3. The centering shaft 1 is arranged through the middle support plate 3. A plurality of connecting rods 5 are all located between the centering shaft 1 and the plurality of hooks 4. One ends of the plurality of connecting rods 5 are all hinged to the lower end of the centering shaft 1, and the other ends of the plurality of connecting rods are respectively hinged to the plurality of hooks 4. The angles between the plurality of connecting rods 5 and the centering shaft 1 are all greater than 0. Then, during the up and down movement of the centering shaft 1, there must be a movement of the plurality of connecting rods 5 along the radial direction of the centering shaft 1, and further, the plurality of hooks 4 can be driven to move along the radial direction of the centering shaft 1 to realize the radial expansion or contraction action, so as to clamp or release the workpiece. The rotary unlocking member 2 is arranged on the centering shaft 1. The rotary unlocking member 2 includes a locking member. The locking member can be connected to the middle support plate 3, so that the centering shaft 1 is connected to the middle support plate 3. When they are connected, the hooks 4 will be kept in synchronous action with the centering shaft 1, and their synchronous action will not cause the hooks 4 to move radially along the centering shaft 1. The locking member has a rotation center line, and the locking member can rotate around the rotation center line to realize the connection or separation from the middle support plate 3. After the locking member is separated from the middle support plate 3, the centering shaft 1 is also separated from the middle support plate 3. The centering shaft 1 can act independently relative to the middle support plate 3, and further, the hooks 4 can be driven to perform actions such as clamping or releasing.

[0038] Specifically, in this embodiment, the lifting tool is applicable to annular workpieces. During the lifting process of the annular workpiece, first, the centering shaft 1 is moved directly above the workpiece by the equipment, and then the centering shaft 1 is driven to descend. In the initial process, since the intermediate support plate 3 is connected to the centering shaft 1 through the rotary unlocking member 2, it can move together with the centering shaft 1 and keep the relative rest between the hook 4 and the centering shaft 1. Continuing to descend, when the abutting portion descends to the bottom with the centering shaft 1 and abuts against the top of the workpiece, at this time, multiple hooks 4 located below the intermediate support plate 3 can all extend into the cavity of the annular workpiece. At this time, due to the action of gravity, the centering shaft 1 will continue to descend. Since the rotary unlocking member 2 is connected to the centering shaft 1, it will continue to descend with the centering shaft 1. When the centering shaft 1 continues to descend to a preset height, the locking portion of the rotary unlocking member 2 can abut against the intermediate support plate 3. Once the abutment occurs, the locking member can rotate, which can realize the separation of the locking member and the intermediate support plate 3 and make the centering shaft 1 and the intermediate support plate 3 disengage. After the disengagement, the centering shaft 1 is not restricted by the up-and-down movement and can continue to move up and down. And after the centering shaft 1 and the intermediate support plate 3 are disengaged, the centering shaft 1 can rise relative to the hook 4, and it can drive multiple connecting rods 5 to drive multiple hooks 4 outward, that is, it can drive multiple hooks 4 to expand radially outward until multiple hooks 4 all abut against the inner wall of the workpiece. At this time, the hook 4 cannot continue to expand outward. If the centering shaft 1 continues to move upward, it can synchronously drive components such as the hook 4 and the intermediate support plate 3 to move upward synchronously, thereby realizing the lifting of the workpiece, which can effectively save the driving components of the hook 4 and avoid the damage of the driving components for clamping the workpiece after heat treatment.

[0039] In this embodiment, the rotary unlocking member 2 further includes a rotary switch 21, and the locking member includes a locking ring 22. The rotary switch 21 is fixedly connected to the centering shaft 1 and can drive the locking ring 22 to rotate. A locking buckle 31 is provided at the top of the intermediate support plate 3. The locking ring 22 can be inserted below the locking buckle 31 to connect the centering shaft 1 and the intermediate support plate 3, that is, the locking ring 22 can be inserted into the locking buckle 31 and interlock with the locking buckle 31 to achieve the purpose of connecting the centering shaft 1 and the intermediate support plate 3. When the intermediate support plate 3 is stationary, the centering shaft 1 can drive the rotary switch 21 and the locking ring 22 to continue to move downward. When the locking ring 22 abuts against the top of the intermediate support plate 3, the rotary switch 21 can drive the locking ring 22 to rotate a preset angle to realize the unlocking of the locking ring 22 and the locking buckle 31. After the locking ring 22 and the locking buckle 31 are unlocked, the centering shaft 1 and the intermediate support plate 3 can be disengaged.

[0040] Specifically, the locking ring 22 includes a connecting portion 221 arranged in the vertical direction and a locking portion 222 arranged in the horizontal direction. The connecting portion 221 is perpendicularly connected to the middle of the locking portion 222. A rectangular hole 311 is formed in the middle of the locking buckle 31. The width of the rectangular hole 311 is greater than the width of the locking portion 222 and less than the length of the locking portion 222. The locking portion 222 can pass through the rectangular hole 311 and be connected to the bottom of the locking buckle 31. That is, the entire locking ring 22 is set in a T shape. When the locking portion 222 is aligned with the rectangular hole 311, the locking portion 222 can pass through the rectangular hole 311 and be located below the locking buckle 31. Then, by rotating the locking ring 22, the locking of the locking ring 22 and the locking buckle 31 can be achieved. In this embodiment, the preset angle is 90°, that is, the locking portion 222 intersects the rectangular hole 311 perpendicularly. After rotating 90°, the locking portion 222 corresponds to the rectangular hole 311. At this time, the locking portion 222 can disengage from the rectangular hole 311, realizing the disengagement of the centering shaft 1 and the intermediate support plate 3.

[0041] In this embodiment, a contact sensor is provided at the bottom of the locking portion 222. The contact sensor is electrically connected to the rotary switch 21. When the contact sensor abuts against the intermediate support plate 3, the rotary switch 21 can drive the locking ring 22 to rotate a preset angle. That is, by using a contact sensor to judge the positional relationship between the locking ring 22 and the intermediate support plate 3. Only when the intermediate support plate 3 is supported by the top of the workpiece, will there be a relative displacement between the centering shaft 1 and the intermediate support plate 3. Thus, the position between the locking ring 22 and the intermediate support plate 3 will also change, so as to realize the contact between the contact sensor and the intermediate support plate 3. After the contact, it can send a signal to the rotary switch 21 to control the locking ring 22 to rotate a preset angle, releasing the connection between the centering shaft 1 and the intermediate support plate 3, so that the centering shaft 1 can move freely up and down.

[0042] For the convenience of hoisting by external equipment, a lifting ring 6 is further included. The lifting ring 6 is fixed to the upper end of the centering shaft 1. For example, when using a crane to hoist the entire lifting tool, the hook of the crane can be inserted into the lifting ring 6, and then the centering shaft 1 can be driven to displace.

[0043] Similarly, in order to prevent the centering shaft 1 from rotating and damaging the clamping action of the lifting hook 4, it is necessary to limit the centering shaft 1 to move only in the up and down direction. Two clamping plates 11 are provided at the upper end of the centering shaft 1. The two clamping plates 11 respectively clamp on both sides of the lifting ring 6. Since the lifting ring 6 needs to be connected to the hooks of equipment such as cranes and cannot rotate itself, the centering shaft 1 of the lifting ring 6 clamped by the two clamping plates 11 also cannot rotate, avoiding the rotation of the lifting hook 4 and improving the stability of hoisting the workpiece.

[0044] In order to better achieve the abutment between the middle support plate 3 and the workpiece, the abutment portion is set as a support arm 32, and at least three support arms 32 are arranged at intervals along the circumference of the middle support plate 3 below the middle support plate 3. The lower end of the support arm 32 is provided with an abutment surface that is adapted to the shape of the top surface of the workpiece, and the abutment surface is used to abut with the top surface of the workpiece. In the process of the middle support plate 3 descending with the centering shaft 1, the abutment surfaces of the three support arms 32 will abut with the edge of the top of the workpiece. At this time, a height difference will be maintained between the middle support plate 3 and the workpiece, which can prevent the hook 4 from extending into the bottom of the workpiece, causing a downward smashing effect, and avoiding damage to the workpiece. In this embodiment, the abutment surface can be set as a horizontal plane, which can increase the support contact area and ensure the support strength.

[0045] Specifically, it also includes a hollow sleeve 7, which is fixed at the bottom of the middle support plate 3. The centering shaft 1 is inserted into the hollow sleeve 7. The hollow sleeve 7 limits the centering shaft 1 to prevent it from swinging in the circumferential direction and allows it to move in the up and down directions. At the same time, the middle part of the support arm 32 is connected to the hollow sleeve 7 through the reinforcing rib 321, which can effectively improve the strength of the support arm 32.

[0046] Specifically, in the present embodiment, there are three hooks 4 and connecting rods 5, that is, there is a 120° interval between every two hooks 4. In order to realize the connection between the centering shaft 1 and the connecting rod 5, a connecting seat 12 is provided at the lower end of the centering shaft 1. One ends of the three connecting rods 5 are hinged to the connecting seat 12, and the other ends of the three connecting rods 5 are hinged to the middle parts of the three hooks 4 respectively. In the initial state, the three connecting rods 5 are arranged upwardly between the hooks 4 and the connecting seat 12. When the centering shaft 1 rises relative to the hooks 4, it will drive the ends of the connecting rods 5 to move upward, and then make the connecting rods 5 tend to be arranged in parallel, that is, the distance between the two ends of the connecting rods 5 in the horizontal direction will also increase, while the position of the centering shaft 1 in the horizontal direction remains unchanged, which will cause the end of the connecting rod 5 hinged to the hook 4 to move outward, and then drive the hook 4 to swing outward, thereby increasing the radial size of the clamping area formed by the multiple hooks 4.

[0047] Embodiment 2

[0048] An automatic lifting device comprises a centering shaft, a rotating unlocking piece, an intermediate supporting plate, a lifting hook and a connecting rod.

[0049] Among them, a butt-joint portion adapted to the top of the workpiece is provided at the bottom of the middle support plate, and a plurality of hooks are arranged at intervals along the circumference of the middle support plate below the middle support plate, and the upper ends of the plurality of hooks are all hinged to the middle support plate. The centering shaft is arranged on the middle support plate, and a plurality of connecting rods are all located between the centering shaft and the plurality of hooks. One ends of the plurality of connecting rods are all hinged to the lower end of the centering shaft, and the other ends of the plurality of connecting rods are respectively hinged to the plurality of hooks. The angles between the plurality of connecting rods and the centering shaft are all greater than 0. Then, during the up-and-down movement of the centering shaft, there must be a movement of the plurality of connecting rods along the radial direction of the centering shaft, and thus the plurality of hooks can be driven to move along the radial direction of the centering shaft, realizing the radial expansion or contraction action, and further clamping or releasing the workpiece. The rotation unlocking member is arranged on the centering shaft, and the rotation unlocking member includes a locking member. The locking member can be connected to the middle support plate, so that the centering shaft is connected to the middle support plate. When they are connected, the hooks and the centering shaft will maintain synchronous actions, and the synchronous actions will not cause the hooks to move radially along the centering shaft. The locking member has a rotation center line, and the locking member can rotate around the rotation center line to realize the connection or separation from the middle support plate. After the locking member is separated from the middle support plate, the centering shaft is also separated from the middle support plate, and the centering shaft can act independently relative to the middle support plate, and thus can drive the hooks to perform actions such as clamping or releasing.

[0050] Specifically, in this embodiment, the lifting tool is applicable to annular workpieces. During the lifting process of the annular workpiece, first, the centering shaft is moved to directly above the workpiece by the equipment, and then the centering shaft is driven to descend. In the initial process, since the middle support plate is connected to the centering shaft through the rotation unlocking member, it can move with the centering shaft and keep the relative static state between the hooks and the centering shaft. Continuing to descend, when the butt-joint portion descends with the centering shaft to the bottom and abuts against the top of the workpiece, at this time, a plurality of hooks located below the middle support plate can all extend into the cavity of the annular workpiece. At this time, due to the action of gravity, the centering shaft will continue to descend. Since the rotation unlocking member is connected to the centering shaft, it will follow the centering shaft to continue to descend. When the centering shaft continues to descend to a preset height, the locking portion of the rotation unlocking member can abut against the middle support plate. Once the abutment occurs, the locking member can rotate, realizing the separation of the locking member from the middle support plate and making the centering shaft separate from the middle support plate. After the separation, the centering shaft is not restricted by the up-and-down movement and can continue to move up and down. And after the centering shaft is separated from the middle support plate, the centering shaft can rise relative to the hooks, and it can drive a plurality of connecting rods to drive the plurality of hooks outward, that is, drive the plurality of hooks to expand radially outward until the plurality of hooks all abut against the inner wall of the workpiece. At this time, the hooks cannot continue to expand outward. If the centering shaft continues to move upward, it can synchronously drive components such as the hooks and the middle support plate to move upward synchronously, thereby realizing the lifting of the workpiece, which can effectively save the hook driving assembly and avoid the damage of the driving assembly for clamping the workpiece after heat treatment.

[0051] Different from the first embodiment, in the present embodiment, the rotary unlocking member only includes a locking member, which is configured as a locking ring, which is fixedly connected to the centering shaft, and a locking buckle is provided on the top of the intermediate support plate. The locking ring can be inserted under the locking buckle to connect the centering shaft and the intermediate support plate. When the locking ring abuts against the top of the intermediate support plate, the locking ring can be rotated by a preset angle to unlock the locking ring and the locking buckle. The difference is that, in the present embodiment, the locking ring does not need a rotating switch to drive the rotation, and it can rotate by itself. It can be unlocked with the locking buckle through its own rotation. After unlocking, the centering shaft and the intermediate support plate can be separated, which is convenient for the subsequent separate lifting and lowering of the centering shaft.

[0052] Specifically, the locking ring includes a connecting portion arranged in the vertical direction and a locking portion arranged in the horizontal direction. The connecting portion is vertically connected to the middle portion of the locking portion. A rectangular hole is opened in the middle portion of the lock buckle. The width of the rectangular hole is greater than the width of the locking portion and less than the length of the locking portion. The locking portion can pass through the rectangular hole and connect with the bottom of the lock buckle. Similarly, by setting the locking ring as a whole to a T-shape, the locking spring and the lock buckle are locked and unlocked by utilizing the cooperation between the locking portion and the rectangular hole, thereby realizing the separation and connection of the centering shaft and the intermediate support plate.

[0053] The difference is that an arc-shaped abutting portion is provided on the locking portion, and an arc-shaped driving portion is provided on the middle support plate. When the locking portion moves toward the top of the middle support plate, the arc-shaped driving portion can be connected with the arc-shaped abutting portion, and can drive the locking portion to rotate a preset angle, that is, after the middle support plate is supported by the workpiece, the centering shaft drives the locking ring to continue to move downward, and the locking portion moves downward relative to the middle support plate. In this process, the locking portion can be driven to rotate through the connection between the arc-shaped driving plate and the arc-shaped abutting portion. When the bottom of the locking portion is connected with the middle support plate, the locking portion rotates a preset angle and can be disengaged from the rectangular hole of the lock buckle.

[0054] That is, the rotation of the lock ring can be achieved by using both sensors and mechanical structures, and both are within the scope of the present application.

[0055] The technical solution of the present invention is described in detail above in conjunction with the accompanying drawings, and the described embodiments are used to help understand the concept of the present invention. The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art of the invention may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

[0056] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. An automatic lifting device for lifting workpieces, characterized in that: include: An intermediate support plate, the bottom of which is provided with an abutment portion adapted to the top of the workpiece; A hook, wherein a plurality of the hooks are arranged below the middle support plate at intervals along the circumference of the middle support plate, and the lower ends of the plurality of hooks are hinged to the middle support plate; A centering shaft, which is passed through the middle support plate; Connecting rods, wherein the connecting rods are all located between the centering shaft and the hooks, one end of the connecting rods is hinged to the lower end of the centering shaft, the other ends of the connecting rods are respectively hinged to the hooks, and the angles between the connecting rods and the centering shaft are all greater than 0; A rotation unlocking member, which is arranged on the centering shaft, and the rotation unlocking member includes a locking member, and the locking member can be connected with the middle support plate to connect the centering shaft and the middle support plate; The locking member has a rotation center line, and the locking member can rotate around the rotation center line to achieve connection or separation with the middle support plate; When the abutting portion abuts against the top of the workpiece, the bottom of the locking member can abut against the top of the middle support plate and can be rotated to achieve separation from the middle support plate.

2. The automatic spreader according to claim 1, characterized in that: The rotary unlocking member further comprises a rotary switch, the locking member is configured as a locking ring, the rotary switch is fixedly connected to the centering shaft and can drive the locking ring to rotate, a locking buckle is provided on the top of the intermediate support plate, and the locking ring can be inserted under the locking buckle to connect the centering shaft and the intermediate support plate; When the locking ring abuts against the top of the middle support plate, the rotary switch can drive the locking ring to rotate a preset angle to unlock the locking ring and the lock buckle.

3. The automatic spreader according to claim 2, characterized in that: The locking ring includes a connecting portion arranged in a vertical direction and a locking portion arranged in a horizontal direction. The connecting portion is vertically connected to the middle portion of the locking portion. A rectangular hole is opened in the middle portion of the lock buckle. The width of the rectangular hole is greater than the width of the locking portion and less than the length of the locking portion. The locking portion can pass through the rectangular hole and connect with the bottom of the lock buckle.

4. The automatic spreader according to claim 3, characterized in that: A contact sensor is provided at the bottom of the locking portion, and the contact sensor is electrically connected to the rotary switch. When the contact sensor abuts against the middle support plate, the rotary switch can drive the lock ring to rotate a preset angle.

5. The automatic spreader according to claim 1, characterized in that: The locking member comprises a locking ring, which is fixedly connected to the centering shaft, and a locking buckle is provided on the top of the intermediate support plate, and the locking ring can be inserted under the locking buckle to connect the centering shaft and the intermediate support plate; When the locking ring abuts against the top of the middle support plate, the locking ring can be rotated by a preset angle to unlock the locking ring and the lock buckle.

6. The automatic spreader according to claim 5, characterized in that: The lock ring includes a connecting portion arranged in a vertical direction and a locking portion arranged in a horizontal direction, the connecting portion is vertically connected to the middle of the locking portion, a rectangular hole is opened in the middle of the lock buckle, the width of the rectangular hole is greater than the width of the locking portion and less than the length of the locking portion, and the locking portion can pass through the rectangular hole and connect with the bottom of the lock buckle; The locking portion is provided with an arc-shaped abutting portion, and the middle support plate is provided with an arc-shaped driving portion. When the locking portion moves toward the top of the middle support plate, the arc-shaped driving portion can be connected with the arc-shaped abutting portion and can drive the locking portion to rotate a preset angle.

7. The automatic spreader according to claim 1, characterized in that: It also includes a lifting ring, which is fixed on the upper end of the centering shaft. The upper end of the centering shaft is provided with two clamping plates, and the two clamping plates are respectively clamped on both sides of the lifting ring to limit the rotation of the centering shaft.

8. The automatic spreader according to claim 1, characterized in that: The abutment portion is configured as a support arm, at least three of which are arranged below the intermediate support plate at intervals along the circumference of the intermediate support plate, and the lower end of each support arm is provided with an abutment surface matching the shape of the top surface of the workpiece.

9. The automatic spreader according to claim 8, characterized in that: It also includes a hollow sliding sleeve, which is fixed to the bottom of the middle support plate, the centering shaft is inserted into the hollow sliding sleeve, and the middle part of the support arm is connected to the hollow sliding sleeve through a reinforcing rib.

10. The automatic spreader according to claim 1, characterized in that: A connecting seat is provided at the lower end of the centering shaft, and the connecting rods and the hooks are each provided in three numbers. One end of the three connecting rods is hinged to the connecting seat, and the other ends of the three connecting rods are respectively hinged to the middle parts of the three hooks.

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