A clamp and method of using the same

Abstract

A clamp and a method for using the same belong to the field of hoisting clamps. The clamp includes a first grab hook, a second grab hook, a positioning guide seat, a first lifting plate, a second lifting plate, an intermediate support shaft, a first hanging unit and a second hanging unit. The first grab hook and the second grab hook are rotatably connected to the positioning guide seat, the intermediate support shaft and the positioning guide seat are relatively lifted and lowered, the first lifting plate is rotatably connected to the first grab hook and the intermediate support shaft at both ends, the second lifting plate is rotatably connected to the second grab hook and the intermediate support shaft at both ends, the first hanging unit is rotatably connected to the intermediate support shaft, the second hanging unit is arranged on the first grab hook or the second grab hook, the first hanging unit and the second hanging unit can be hung with each other, an angle control mechanism is arranged between the first hanging unit and the intermediate support shaft, and the angle control mechanism controls the swing angle of the first hanging unit on the intermediate support shaft. By using this clamp, automatic clamping and release of high-temperature workpieces can be achieved.

Description

Technical Field

[0001] The invention discloses a clamp and a use method thereof, belonging to the field of hoisting clamps, in particular to a clamp and a use method thereof. Background Art

[0002] In the industrial production process, special tools and fixtures are used when transporting some high-temperature or other parts that cannot be directly touched by humans. For example, for some parts that need to be quenched, these parts will be placed on a fixture, and these parts and the fixture will be hoisted into the heating furnace using a special fixture. After the heating is completed, they will be hoisted into the quenching liquid for quenching. Because the parts coming out of the heating furnace are hot, people cannot get close to perform hoisting operations, and can only install and disconnect the hook by holding a very long operating rod. The disadvantage of this conventional operation method is that the stability is not high, and the operator needs to have a certain degree of proficiency. If the operation time is too long, the temperature of the parts will drop too much and affect the quenching quality. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a clamp that can clamp and release a high-temperature workpiece by one person operating a crane.

[0004] The technical solution adopted by the present invention to solve its technical problems is: the clamp includes a first grab hook, a second grab hook, a positioning guide seat, a first lifting plate, a second lifting plate, an intermediate support shaft, a first hanging unit and a second hanging unit, the first grab hook and the second grab hook are rotatably connected to the positioning guide seat, the intermediate support shaft and the positioning guide seat are relatively lifted and lowered, the two ends of the first lifting plate are respectively rotatably connected to the first grab hook and the intermediate support shaft, the two ends of the second lifting plate are respectively rotatably connected to the second grab hook and the intermediate support shaft, the first hanging unit is rotatably connected to the intermediate support shaft, the second hanging unit is arranged on the first grab hook or the second grab hook, the first hanging unit and the second hanging unit can be hung with each other, and an angle control mechanism is provided between the first hanging unit and the intermediate support shaft, the angle control mechanism controls the swing angle of the first hanging unit on the intermediate support shaft.

[0005] Preferably, the angle control mechanism includes a wedge block and an angle adjustment boss, the wedge block is rotatably set on the first hanging unit, the angle adjustment boss is set on the intermediate support shaft, and the angle adjustment boss is provided with a first mating protrusion, a second mating protrusion and a third mating protrusion arranged in sequence, the second mating protrusion is arranged on one side of the line connecting the first mating protrusion and the third mating protrusion, and a limiting wall is provided on the first hanging unit on the other side of the line connecting the first mating protrusion and the third mating protrusion, and the wedge block is arranged between the first mating protrusion and the third mating protrusion.

[0006] Preferably, the wedge block is rectangular, and the distance between the second matching protrusion and the limiting wall is smaller than the length of the wedge block.

[0007] Preferably, a first limiting groove and a third limiting groove are respectively provided on two opposite short sides of the wedge block, and a second limiting groove and a fourth limiting groove are respectively provided on two opposite long sides of the wedge block.

[0008] Preferably, the angle adjustment boss is rotatably arranged on the intermediate support shaft, and a follow-up limiting mechanism is provided between the angle adjustment boss and the first lifting plate or the second lifting plate.

[0009] Preferably, the follower limit mechanism includes a fixed bracket and a follower limit block, the fixed bracket is fixedly connected to the angle adjustment boss, the follower limit block is fixedly arranged on the fixed bracket, the follower limit block is arranged on the upper side of the first lifting plate or the second lifting plate, and the first hanging unit is connected to the fixed bracket through a telescopic guide mechanism.

[0010] Preferably, the first hanging unit is a control hook, and the second hanging unit is a hanging protrusion matched with the control hook.

[0011] Preferably, a lifting ring is connected to the middle of the intermediate support shaft, and a positioning guide seat is respectively provided at both ends of the intermediate support shaft. The positioning guide seat is provided with a vertically arranged guide groove, and the two ends of the intermediate support shaft are slidably connected to the guide groove.

[0012] Preferably, a positioning platform is fixedly connected to the lower end of the positioning guide seat, and the positioning platform is arranged between the first grab hook and the second grab hook.

[0013] A method for using a clamp, characterized in that it comprises the following steps:

[0014] Step 1), the clamp falls as a whole, the angle control mechanism controls the first hanging unit and the second hanging unit to maintain a mutually hanging state, the first grab hook and the second grab hook fall to the two sides of the workpiece to be clamped respectively, the positioning guide seat falls to the lowest point and is fixed relatively to the workpiece;

[0015] Step 2), the intermediate support shaft continues to fall along the positioning guide seat, the first grab hook, the second grab hook or the second hook unit pushes the first hook unit to swing upward, and the first hook unit is separated from the second hook unit;

[0016] Step 3), the fixture rises as a whole, the middle support shaft moves upward along the positioning guide seat, and the middle support shaft drives the first hanging unit to rise at the same time. The angle control mechanism controls the downward swing angle of the first hanging unit to keep the first hanging unit and the second hanging unit disengaged. After the middle support shaft rises to the highest position relative to the positioning guide seat, the middle support shaft and the positioning guide seat rise synchronously, and the first grab hook and the second grab hook clamp the workpiece and rise;

[0017] Step 4), after reaching the predetermined position, the fixture and the workpiece fall as a whole. After the workpiece falls to the predetermined position, the intermediate support shaft continues to fall along the positioning guide seat, the first hanging unit falls with the intermediate support shaft, the first grab hook and the second grab hook release the workpiece, and then the fixture rises as a whole, the intermediate support shaft moves upward along the positioning guide seat, the angle control mechanism controls the first hanging unit to swing downward and hang with the second hanging unit, and the first grab hook and the second grab hook remain in the open state and rise.

[0018] Compared with the prior art, the technical solution has the following beneficial effects:

[0019] The present invention adopts a clamp that can realize automatic clamping and releasing. The first grab hook and the second grab hook are connected to the intermediate support shaft through the first lifting plate and the second lifting plate, and the intermediate support shaft and the positioning guide seat are relatively lifted and lowered. The first hanging unit is rotatably connected to the intermediate support shaft, and an angle control mechanism is arranged between the first hanging unit and the intermediate support shaft. Therefore, the angle control mechanism and the first hanging unit are lifted and lowered along with the intermediate support shaft. During the lifting process, the angle control mechanism controls the angle of the first hanging unit, thereby realizing the state of the first hanging unit and the second hanging unit arranged on the first grab hook or the second grab hook, so that the first grab hook and the second grab hook can realize the function of automatic clamping or releasing. Using this clamp, people can avoid approaching to operate the workpiece with high temperature. The operator can clamp or release the workpiece by operating the crane alone, which is convenient to use and improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic structural diagram of a clamp of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the angle control mechanism and the first grab hook and the second grab hook of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the angle control mechanism and the first hanging unit of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the fixing bracket and the angle adjustment boss of the present invention.

[0024] Figure 5 It is a structural schematic diagram of the control hook of the present invention.

[0025] Figure 6 It is a structural schematic diagram of the angle control mechanism and the first grab hook and the second grab hook when the first hanging unit and the second hanging unit are in a hanging state according to the present invention.

[0026] Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0027] Figure 8 It is a structural schematic diagram of the angle control mechanism and the first grab hook and the second grab hook in a state where the first hanging unit and the second hanging unit are gradually separated from each other.

[0028] Fig. 9 for Figure 8 Enlarged view of point B in the middle.

[0029] Fig.10 It is a structural schematic diagram of the angle control mechanism and the first grab hook and the second grab hook when the first hanging unit and the second hanging unit are separated from each other.

[0030] Fig.11 for Fig.10 Enlarged view of center C.

[0031] Fig.12 It is a structural schematic diagram of the angle control mechanism and the first grab hook and the second grab hook in the gradually hooked state of the first hooking unit and the second hooking unit of the present invention.

[0032] Fig.13 for Fig.12 Enlarged view of point D in the middle.

[0033] Among them: 1, lifting ring 2, positioning guide seat 201, guide groove 202, positioning platform 3, lifting plate 301, first lifting plate 302, second lifting plate 4, small semicircular plate 5, small fixed plate 6, intermediate support shaft 7, large semicircular plate 8, large fixed plate 9, spacer ring 10, first grab hook 11, fastening bolt 12, rotating shaft 13, control hook 1301, control hook groove 1302, moving groove 14, guide ring 15, guide column 16, distance ring 17, angle adjustment boss 1701, first matching protrusion 1702, second matching protrusion 1703, third matching protrusion 18, wedge block 1801, first limiting groove 1802, second limiting groove 1803, third limiting groove 1804, fourth limiting groove 19, pin 20, second grab hook 21, fixed bracket 22, follow-up limiting block 23, hanging protrusion. DETAILED DESCRIPTION

[0034] Figures 1 to 13 The best embodiment of the present invention is shown below in conjunction with the attached Figures 1 to 13 The present invention is further described.

[0035] Reference Figure 1~2The clamp includes a first grab hook 10, a second grab hook 20, a positioning guide seat 2, a first lifting plate 301, a second lifting plate 302, an intermediate support shaft 6, a first hanging unit, a second hanging unit and a lifting ring 1. The lifting ring 1 is connected to the middle of the intermediate support shaft 6. A positioning guide seat 2 is provided at both ends of the intermediate support shaft 6. A vertically arranged guide groove 201 is provided on the positioning guide seat 2. Both ends of the intermediate support shaft 6 are slidably connected to the guide groove 201. The first grab hook 10 and the second grab hook 20 are rotatably connected to the positioning guide seat 2 through a rotating shaft 12. Two large semicircular plates 7 and a large fixing plate 8 are installed at both ends of the rotating shaft 12, and are fixed with fastening bolts 11. The intermediate support shaft 6 is arranged on the upper side of the rotating shaft 12, and is arranged to be lifted and lowered relative to the positioning guide seat 2. The two ends of the first lifting plate 301 are respectively rotatably connected to the first grab hook 10 and the intermediate support shaft 6, and the two ends of the second lifting plate 302 are respectively rotatably connected to the second grab hook 20 and the intermediate support shaft 6. The first hanging unit is rotatably connected to the intermediate support shaft 6, and the second hanging unit is arranged on the first grab hook 10 or the second grab hook 20. The first hanging unit and the second hanging unit can be hung with each other.

[0036] The first grab hook 10 and the second grab hook 20 are connected in an X-shaped cross rotation through the rotating shaft 12. A rectangular hook body with an arc is set at one end of the two grab hooks, and a semicircular groove is set on the hook body to grab the tooling. The other end of the two grab hooks is rotatably connected to the lifting plate 3 through the support shaft 6. In this embodiment, the lifting plate 3 is 4 pieces, two pieces in a group. The first lifting plate 301 is connected to the first hook 10, and the second lifting plate 302 is connected to the second grab hook 20. The length of the support shaft 6 between the first lifting plate 301 and the first grab hook 10 is relatively long, and is fixed by installing a spacer ring 9.

[0037] A positioning platform 202 is fixedly connected to the lower end of the positioning guide seat 2 , and the positioning platform 202 is arranged between the hook bodies of the first grab hook 10 and the second grab hook 20 .

[0038] In this embodiment, the upper side of the lifting ring 1 is an elliptical ring, and the lower side is two opposite rectangular plates. The plates are arranged vertically with the elliptical ring, and the elliptical ring is sandwiched between the plates. A through hole is arranged on the rectangular plate, and the middle support shaft 6 is arranged in the through hole. The two rectangular plates are arranged between the first lifting plate 301. The first hanging unit and the angle control mechanism are arranged between the second lifting plate 302. The first lifting plate 301, the rectangular plate of the lifting ring 1, the second lifting plate 302, the angle control mechanism and the first hanging unit are arranged on the middle support shaft 6 in sequence, and move up and down along the guide groove 201 with the middle support shaft 6. The two ends of the middle support shaft 6 are installed in the guide groove 201 by installing two small semicircular plates 4 and a small fixing plate 5.

[0039] When the crane lifts the lifting ring 1, the lifting ring 1 drives the intermediate support shaft 6 to move upward in the guide groove 201, and the distance between the intermediate support shaft 6 and the rotating shaft 12 becomes larger. The angle control mechanism controls the first hanging unit to disengage from the second hanging unit, and the first grab hook 10 and the second grab hook 20 will clamp the tooling. On the contrary, when the crane lowers the lifting ring 1, the lifting ring 1 drives the intermediate support shaft 6 to move downward in the guide groove 201, and the distance between the intermediate support shaft 6 and the rotating shaft 12 becomes smaller. The angle control mechanism controls the first hanging unit to hang with the second hanging unit, and the first grab hook 10 and the second grab hook 20 will release the tooling.

[0040] Reference Figures 3-5 , an angle control mechanism is provided between the first hanging unit and the intermediate support shaft 6, and the angle control mechanism controls the swing angle of the first hanging unit on the intermediate support shaft 6. In this embodiment, the angle control mechanism includes a wedge 18 and an angle adjustment boss 17, the first hanging unit is a control hook 13, the control hook 13 is a hook body, the wedge 18 is rotatably arranged on the control hook 13, and the angle adjustment boss 17 is fixed on the fixed bracket 21. The angle control mechanism includes any other structure that can realize the control of the angle of the first hanging unit, and the structure in this embodiment is only one kind.

[0041] The wedge block 18 is rectangular, and the distance between the second matching protrusion 1702 and the limiting wall is less than the length of the wedge block 18. A first limiting groove 1801 and a third limiting groove 1803 are respectively provided on two opposite short sides of the wedge block 18, and a second limiting groove 1802 and a fourth limiting groove 1804 are respectively provided on two opposite long sides of the wedge block 18.

[0042] The angle adjustment boss 17 is provided with a first mating protrusion 1701, a second mating protrusion 1702 and a third mating protrusion 1703 which are arranged in sequence. The second mating protrusion 1702 is arranged on one side of the line connecting the first mating protrusion 1701 and the third mating protrusion 1703. A limiting wall is provided on the control hook 13 on the other side of the line connecting the first mating protrusion 1701 and the third mating protrusion 1703. The wedge block 18 is arranged between the first mating protrusion 1701 and the third mating protrusion 1703.

[0043] The angle adjustment boss 17 is fixedly connected to the fixed bracket 21 , and the fixed bracket 21 is in the shape of “6”. The control hook 13 and the two angle adjustment bosses 17 are arranged between the two fixed brackets 21 , and the control hook 13 and the angle adjustment bosses 17 are rotatably arranged on the intermediate support shaft 6 .

[0044] A control hook groove 1301 is provided at one end of the control hook 13 close to the angle adjustment boss 17, and the angle adjustment boss 17 is provided in the control hook groove 1301. A motion groove 1302 is provided on the upper side of the control hook groove 1301, the control hook groove 1301 is connected with the motion groove 1302, and the first matching protrusion 1701, the second matching protrusion 1702 and the third matching protrusion 1703 are provided in the motion groove 1302.

[0045] A follow-up limiting mechanism is provided between the angle adjustment boss 17 and the first lifting plate 301 and the second lifting plate 302. The follow-up limiting mechanism comprises a fixed bracket 21 and a follow-up limiting block 22. The follow-up limiting block 22 is fixedly arranged on the fixed bracket 21. The follow-up limiting block 22 is arranged on the upper side of the first lifting plate 301 or the second lifting plate 302. The side of the follow-up limiting block 22 is limited by the side of the lifting ring 1. When the intermediate support shaft 6 moves up and down in the guide groove 201, the bottom surface of the follow-up limiting block 22 is in close contact with the first lifting plate 301 or the second lifting plate 302, and the first lifting plate 301 or the second lifting plate 302 limits the follow-up limiting block 22.

[0046] The control hook 13 is connected to the fixed bracket 21 through a telescopic guide mechanism, and the telescopic guide mechanism includes a guide ring 14 and a guide column 15. The guide ring 14 is sleeved on the guide column 15. A pin hole is set at one end of the control hook 13, and one end of the guide ring 14 is rotatably installed in the pin hole through a pin. One end of the guide column 15 can be telescopically extended into the other end of the guide ring 14. An annular hole is set at the other end of the guide column 15. A pin shaft 19 is set to rotate with the fixed bracket 21. Two distance rings 16 are set between the annular hole and the fixed bracket 21, so that the guide column 15 can rotate freely between the two fixed brackets 21.

[0047] The second hooking unit is a hooking protrusion 23 matched with the control hook 13, and the second hooking unit is arranged on the first hook 10 or the second hook 20. In this embodiment, the hooking protrusion 23 is arranged on the second hook 20. The first hooking unit and the second hooking unit can be hooked to each other.

[0048] When using the present invention, the control hook 13 is cyclically located in four positions, corresponding to the four working states of the sling, and its working principle is as follows:

[0049] Reference Figure 6-7, the control hook 13 corresponds to the loose state of the sling when it is in position 1. The control hook 13 rotates around the intermediate support shaft 6. As the crane lifts the lifting ring 1, the control hook 13 swings down around the intermediate support shaft 6 due to the position of the center of gravity. The corresponding wedge block 18 also moves, the third limiting groove 1803 matches the first matching protrusion 1701, and the second limiting groove 1802 matches the second matching protrusion 1702. At this time, the swing angle of the control hook 13 is the largest, and the control hook 13 can hook the hooking protrusion 23, thus preventing the intermediate support shaft 6 from moving up, and the first grab hook 10 and the second grab hook 20 are in a loose state.

[0050] Reference Figures 8 and 9 , the control hook 13 in position 2 corresponds to the intermediate state 1 of the sling. As the crane lowers the lifting ring 1 from the loosened state of the sling, the distance between the intermediate support shaft 6 and the rotary shaft 12 decreases until it is the minimum. At this time, the hooking protrusion 23 pushes the control hook 13 and the wedge 18 to the Fig. 9 The wedge block 18 is between the second mating protrusion 1702 and the third mating protrusion 1703, the first limiting groove 1801 matches the third mating protrusion 1703, and the second limiting groove 1802 is located between the second mating protrusion 1702 and the third mating protrusion 1703. In this state of the sling, the distance between the middle support shaft 6 and the rotary shaft 12 is the smallest, and the first grab hook 10 and the second grab hook 20 are in the middle state one.

[0051] Reference Figures 10-11 When the control hook 13 is in position three, it corresponds to the clamping state of the sling, that is, the lifting state of the workpiece. As the crane lifts the lifting ring 1 from the middle state of the sling, the control hook 13 swings down around the intermediate support shaft 6 under the action of the center of gravity, and the wedge block 18 moves along. The wedge block 18 is located between the limiting wall of the motion groove 1302 and the second matching protrusion 1702, and the third limiting groove 1803 coincides with the second matching protrusion 1702. One corner of the wedge block 18 presses against the limiting wall. Under this limiting control, the control hook 13 swings down at a smaller angle, and the control hook 13 cannot hook the hanging protrusion 23, so that the intermediate support shaft 6 can continue to be lifted upwards. As the distance between the intermediate support shaft 6 and the rotating shaft 12 increases until it is maximum, the first grab hook 10 and the second grab hook 20 are in a clamped state.

[0052] Reference Figures 12-13, the control hook 13 corresponds to the intermediate state 2 of the sling when it is in position 4. As the crane lowers the lifting ring 1 from the clamping state of the sling, the distance between the intermediate support shaft 6 and the rotating shaft 12 becomes smaller until it is the smallest. At this time, the hooking protrusion 23 pushes the control hook 13 and the wedge block 18 to the position shown in the figure. The wedge block 18 is located between the second matching protrusion 1702 and the third matching protrusion 1703, and the second limiting groove 1802 is consistent with the third matching protrusion 1703. When the sling is in this state, the distance between the intermediate support shaft 6 and the rotating shaft 12 is also the smallest, and the first grab hook 10 and the second grab hook 20 are in the placement state 2. When the crane lifts the lifting ring 1 again, the control hook 13 returns to position 1, and the sling returns to the loosened state.

[0053] As the crane lifts and puts down the lifting ring 1, the position cycle of the control hook 13 and the wedge 18 is controlled, and the sling also cycles in four states. So the automatic lifting and putting down of the workpiece is realized.

[0054] When the control hook 13 is in position 2 and position 4, the distance between the intermediate support shaft 6 and the rotary shaft 12 is the smallest. The difference between them is the different positions of the wedge block 18. Because the positions of the wedge block 18 are different, when the crane lifts next time, as the intermediate support shaft 6 moves up, the distance between it and the rotary shaft 12 increases, and the control hook 13 swings down at different angles. When the control hook 13 swings down from position 2 to position 3, the control hook 13 cannot hook the hooking protrusion 23, then the distance between the intermediate support shaft 6 and the rotary shaft 12 will increase further to the maximum value, that is, the clamping state of the sling. When the control hook 13 is in position 4, when the crane lifts next time, the position of the control hook 13 swings down from position 4 to position 1, and the control hook 13 will hook the hooking protrusion 23, so that the intermediate support shaft 6 cannot continue to move up, and the distance between the intermediate support shaft 6 and the rotary shaft 12 will not continue to increase, and the sling is in a loose state.

[0055] Working process:

[0056] Reference Figures 6 to 13 When the crane lifts the lifting ring 1, as the intermediate support shaft 6 moves upward in the guide groove 201 on the positioning guide seat 2, one side of the hook of the control hook 13 will swing down around the center of the intermediate support shaft 6.

[0057] When the crane lifts the lifting ring 1, the intermediate support shaft 6 moves up to the top in the guide groove 201, the control hook 13 is completely separated from the hanging protrusion 23, and the first grab hook 10 and the second grab hook 20 clamp the tooling.

[0058] When the crane lifts the tooling to the specified position, it puts down the tooling, and the positioning platform 202 falls onto the tooling. When the crane lifts the lifting ring 1 again, the intermediate support shaft 6 moves up a small distance in the guide groove 201, and the control hook 13 hooks the hooking protrusion 23, and the intermediate support shaft 6 cannot move further up. At this time, the first grab hook 10 and the second grab hook 20 release the tooling.

[0059] Whether the control hook 13 can hook the hooking protrusion 23 depends on the position of the wedge block 18. When the crane lowers the lifting ring 1, if it is lowered from the position of releasing the clamp, that is, when the control hook 13 is at position one, the lifting device will come to the intermediate state one, and if it is lowered from the position of clamping the tooling, that is, when the control hook 13 is at position three, the lifting device will come to the intermediate state two.

[0060] Each time the lifting and lowering is performed, the control hook 13 is controlled by the angle control mechanism, the corresponding position changes cyclically, and the state of the lifting device also changes cyclically.

[0061] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A clamp, characterized in that: The invention comprises a first grab hook (10), a second grab hook (20), a positioning guide seat (2), a first lifting plate (301), a second lifting plate (302), an intermediate support shaft (6), a first hanging unit and a second hanging unit, wherein the first grab hook (10) and the second grab hook (20) are rotatably connected to the positioning guide seat (2), the intermediate support shaft (6) and the positioning guide seat (2) are arranged to be lifted relative to each other, the two ends of the first lifting plate (301) are respectively rotatably connected to the first grab hook (10) and the intermediate support shaft (6), the two ends of the second lifting plate (302) are respectively rotatably connected to the second grab hook (20) and the intermediate support shaft (6), the first hanging unit is rotatably connected to the intermediate support shaft (6), the second hanging unit is arranged on the first grab hook (10) or the second grab hook (20), the first hanging unit and the second hanging unit can be hung to each other, and an angle control mechanism is arranged between the first hanging unit and the intermediate support shaft (6), the angle control mechanism controls the swing angle of the first hanging unit on the intermediate support shaft (6); The angle control mechanism comprises a wedge block (18) and an angle adjustment boss (17); the wedge block (18) is rotatably arranged on the first hanging unit; the angle adjustment boss (17) is arranged on the intermediate support shaft (6); a first matching protrusion (1701), a second matching protrusion (1702) and a third matching protrusion (1703) are arranged in sequence on the angle adjustment boss (17); the second matching protrusion (1702) is arranged on one side of a line connecting the first matching protrusion (1701) and the third matching protrusion (1703); a limiting wall is arranged on the first hanging unit on the other side of a line connecting the first matching protrusion (1701) and the third matching protrusion (1703); and the wedge block (18) is arranged between the first matching protrusion (1701) and the third matching protrusion (1703); The angle adjustment boss (17) is rotatably arranged on the intermediate support shaft (6), and a follow-up limiting mechanism is provided between the angle adjustment boss (17) and the first lifting plate (301) or the second lifting plate (302); The follow-up limiting mechanism comprises a fixed bracket (21) and a follow-up limiting block (22); the fixed bracket (21) is fixedly connected to the angle adjustment boss (17); the follow-up limiting block (22) is fixedly arranged on the fixed bracket (21); the follow-up limiting block (22) is arranged on the upper side of the first lifting plate (301) or the second lifting plate (302); and the first hanging unit is connected to the fixed bracket (21) via a telescopic guide mechanism; The first hanging unit is a control hook (13), and the second hanging unit is a hanging protrusion (23) matched with the control hook (13).

2. A clamp according to claim 1, characterized in that: The wedge block (18) is rectangular, and the distance between the second matching protrusion (1702) and the limiting wall is smaller than the length of the wedge block (18).

3. A clamp according to claim 2, characterized in that: A first limiting groove (1801) and a third limiting groove (1803) are respectively provided on two opposite short sides of the wedge block (18), and a second limiting groove (1802) and a fourth limiting groove (1804) are respectively provided on two opposite long sides of the wedge block (18).

4. A clamp according to claim 1, characterized in that: A lifting ring (1) is connected to the middle of the intermediate support shaft (6), and a positioning guide seat (2) is provided at each end of the intermediate support shaft (6). A vertically arranged guide groove (201) is provided on the positioning guide seat (2), and the guide grooves (201) are slidably connected at both ends of the intermediate support shaft (6).

5. A clamp according to claim 1, characterized in that: The lower end of the positioning guide seat (2) is fixedly connected to a positioning platform (202), and the positioning platform (202) is arranged between the first grab hook (10) and the second grab hook (20).

6. A method for using a clamp according to any one of claims 1 to 5, characterized in that: The steps include: Step 1), the clamp as a whole falls, the angle control mechanism controls the first hanging unit and the second hanging unit to maintain a mutually hanging state, the first grab hook (10) and the second grab hook (20) fall to the two sides of the workpiece to be clamped respectively, and the positioning guide seat (2) falls to the lowest point and is fixed relative to the workpiece; Step 2), the intermediate support shaft (6) continues to fall along the positioning guide seat (2), the first grab hook (10), the second grab hook (20) or the second hanging unit pushes the first hanging unit to swing upward, and the first hanging unit is separated from the second hanging unit; Step 3), the fixture as a whole rises, the intermediate support shaft (6) moves upward along the positioning guide seat (2), and the intermediate support shaft (6) drives the first hanging unit to rise at the same time. The angle control mechanism controls the downward swing angle of the first hanging unit so that the first hanging unit and the second hanging unit remain disengaged. After the intermediate support shaft (6) rises to the highest position relative to the positioning guide seat (2), the intermediate support shaft (6) and the positioning guide seat (2) rise synchronously, and the first grab hook (10) and the second grab hook (20) clamp the workpiece and rise; Step 4), after reaching the predetermined position, the fixture and the workpiece fall as a whole. After the workpiece falls to the predetermined position, the intermediate support shaft (6) continues to fall along the positioning guide seat (2), the first hanging unit falls along the intermediate support shaft (6), the first grab hook (10) and the second grab hook (20) release the workpiece, and then the fixture rises as a whole, the intermediate support shaft (6) moves upward along the positioning guide seat (2), the angle control mechanism controls the first hanging unit to swing downward and hang with the second hanging unit, and the first grab hook (10) and the second grab hook (20) remain in an open state and rise.

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