A scallop grab

Abstract

The utility model discloses a fan -shaped shell grab bucket belongs to the technical field of grab bucket, including stand and two grab bucket bodies, and the upper end surface of each grab bucket body is fixedly arranged with the hinged rod, and the top of each hinged rod is rotatably connected with the stand, and the outer surface of stand is hinged to two hydraulic telescopic rods, and the output of each hydraulic telescopic rod is hinged to corresponding grab bucket body, the top of each hinged rod is fixedly arranged with the gear, when using, when two grab bucket bodies drive two hinged rods synchronous rotation, two hinged rods synchronous rotation drive two gears rotate, because two gears interlock, when because two hydraulic telescopic rods exist action difference and lead to two grab bucket bodies rotate out -of -step situation appears, two gears can guarantee two hinged rods synchronous rotation, and then guarantee the synchronous rotation of grab bucket body, avoid two grab bucket bodies to have the phenomenon of throwing material behavior when the material of grabbing hoisting.

Description

Technical Field

[0001] This utility model relates to a grab bucket, and more particularly to a fan-shaped shell grab bucket. Background Technology

[0002] A grab bucket is a specialized tool used by cranes to grab dry bulk cargo. It consists of two or more closable bucket-shaped jaw plates (equivalent to the grab bucket body in this application) that come together to form a cargo space. During loading, the jaw plates close in the material pile, and the material is grabbed into the cargo space. During unloading, the jaw plates open while suspended above the material pile, and the material scatters onto the pile. The lifting and lowering of the jaw plates is generally controlled by the crane's hoisting mechanism wire rope.

[0003] Existing grab buckets typically open and close using hydraulic telescopic rods, with each jaw plate corresponding to one rod. In actual use, although each rod is activated simultaneously, inconsistent movements can still occur. This is mainly due to individual mechanical differences in the hydraulic rods, possibly caused by air in the cylinder 8. During use, changes to the hydraulic oil, or repairs and replacements of the inlet connector 10, cylinder 8, piston, or output rod 9, can also lead to multiple hydraulic rods being activated simultaneously but moving inconsistently. This, in turn, results in material being thrown out during grabbing and hoisting. Utility Model Content

[0004] The purpose of this invention is to provide a fan-shaped shell grab that can keep multiple grab bodies rotating synchronously, so as to open or close the grab bodies, effectively solving the problem of material throwing when grabbing and hoisting materials in the prior art.

[0005] The present invention adopts the following technical solution: a fan-shaped shell grab bucket, comprising a column and two grab bucket bodies, each grab bucket body having a hinge rod fixedly installed on its upper end surface, the top end of each hinge rod being rotatably connected to the column, the outer surface of the column having two hydraulic telescopic rods hinged to it, the output end of each hydraulic telescopic rod being hinged to the corresponding grab bucket body; each hinge rod having a gear fixedly installed at its top end, the central axis of the gear coinciding with the rotation axis of the top end of the hinge rod, and the two gears meshing with each other.

[0006] Furthermore, a fixing block is fixedly installed at the bottom of the column, and two hinge rods are fixedly installed on each grab bucket body, and are arranged in the front-to-back direction on the upper end face of the grab bucket body. The top end of the front hinge rod is hinged to the front side of the fixing block, and the top end of the rear hinge rod is hinged to the rear side of the fixing block.

[0007] Furthermore, a force bar is fixedly installed on the upper surface of each grab body, and the top of each force bar is hinged to the corresponding hydraulic telescopic rod.

[0008] Furthermore, the gears include a left gear and a right gear. A failure device is provided between the left gear and the left hinge rod to switch between two states: fixed position and mutual rotation. When the failure device is closed, the left gear and the left hinge rod remain in a fixed position and form a whole. When the failure device is opened, the left gear and the left hinge rod are released from their fixed position and can rotate relative to each other.

[0009] Furthermore, the failure device includes a pin disposed within the hinge rod on the left side, the pin being slidably disposed within the hinge rod on the left side in the front-back direction; the pin is sleeved within a sliding hole opened on the end face of the fixed block, a spline is fixedly disposed at the outer end of the pin, a bushing is fixedly disposed on the rear side of the left gear, the bushing being rotatably connected to the hinge rod on the left side, and an internal tooth groove adapted to the spline is opened on the outer side of the left gear in the front-back direction; the spline is engaged with the left gear through the internal tooth groove; a through groove communicating with the sliding hole is opened on the left side face of the fixed block in the front-back direction, a rotating block is rotatably connected to the inner end of the pin, a lever is fixedly disposed on the outer surface of the rotating block, the lever extends through the through groove to the outside of the fixed block; a closing groove is opened on the inner bottom wall of the through groove of the fixed block, and an opening groove is opened on the inner top wall of the through groove of the fixed block.

[0010] Furthermore, the outer side of the hinge rod is provided with a receiving groove, and the bushing of the left gear is located in the receiving groove and rotatably connected to the hinge rod.

[0011] Furthermore, the top of the hinge rod is provided with a through hole that matches the pin. Several guide rails are fixedly installed on the hinge rod in the left-right direction through the inner wall of the through hole. Several guide grooves that match the guide rails are provided on the outer surface of the pin in the front-back direction. The pin is slidably connected to the hinge rod through the guide rails and guide grooves.

[0012] Furthermore, a spring is fixedly installed between the rotating block and the inner bottom wall of the sliding hole, and the spring is always in a stretched state.

[0013] Furthermore, a fixing notch is provided on the outer side of the fixing block at the position corresponding to the closing groove; an external thread is provided on the outer surface of the lever. When the lever is located in the closing groove, a locking nut is screwed onto the lever so that the locking nut abuts against the inner bottom wall of the fixing notch.

[0014] Furthermore, a hinge is fixedly provided at the top of the column.

[0015] I. The grab bucket body, hinge rod, hydraulic telescopic rod, and gears of this utility model, when used, drive the two hinge rods to rotate synchronously when the two grab bucket bodies rotate. The synchronous rotation of the two hinge rods drives the two gears to rotate. Since the two gears mesh with each other, when the two grab bucket bodies rotate asynchronously due to the difference in the movement of the two hydraulic telescopic rods, the two gears can ensure that the two hinge rods rotate synchronously, thereby ensuring the synchronous rotation of the grab bucket bodies and avoiding the phenomenon of material throwing when the two grab bucket bodies grab and lift materials.

[0016] II. This utility model, through the setting of a pin, spline, left gear, and lever, when in use, rotates the lever from the closing slot into the through slot, and then moves the lever outward. The lever drives the pin and spline to move outward. When the lever moves to the opening slot, rotate the lever upward so that the lever enters the opening slot. At this time, rotating the left grab body drives the left hinge rod to rotate. The left hinge rod drives the pin to rotate, and the pin drives the spline to rotate. At this time, since the spline is located outside the left gear, the pin will no longer drive the left gear to rotate. At the same time, the rotation of the hinge rod cannot drive the left gear to rotate either. This is the failure state of the device. It is possible to check whether the actions of the two hydraulic telescopic rods are consistent. The inconsistent hydraulic telescopic rods should be inspected, repaired, or replaced. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a front view structural diagram of the present utility model; Figure 3 A three-dimensional structural diagram of the two grab bucket bodies in the open state of this utility model; Figure 4 This is a front view structural diagram of the two grab bucket bodies in the open state of this utility model; Figure 5 This is a three-dimensional structural diagram of the column in this utility model; Figure 6 This is a three-dimensional structural diagram of the grab bucket body in this utility model; Figure 7 In this utility model Figure 6 Enlarged schematic diagram of the structure at point A in the diagram; Figure 8 This is a partial three-dimensional structural diagram of the fixing block in this utility model; Figure 9 This is a schematic diagram of the internal three-dimensional structure of the fixing block in this utility model; Figure 10 This is a three-dimensional structural diagram of the pin, the left hinge rod, and the left gear in the separated state of this utility model.

[0018] In the diagram, 1. Column; 2. Grab body; 3. Hinge rod; 4. Hydraulic telescopic rod; 5. Gear; 6. Fixing block; 7. Force rod; 8. Cylinder; 9. Output rod; 10. Oil inlet connector; 11. Left gear; 12. Right gear; 13. Pin; 14. Sliding hole; 15. Spline; 16. Bushing; 17. Internal gear groove; 18. Through groove; 19. Rotating block; 20. Toggle lever; 21. Closing groove; 22. Opening groove; 23. Receiving groove; 24. Through hole; 25. Guide rail; 26. Guide groove; 27. Spring; 28. Fixing notch; 29. ​​Locking nut. Detailed Implementation

[0019] Please see Figure 1-10 The present invention will now be described in detail with reference to the accompanying drawings and embodiments: The fan-shaped shell grab of this utility model includes a column 1 and two grab bodies 2. A hinge rod 3 is fixedly provided on the upper end face of each grab body 2. The top end of each hinge rod 3 is rotatably connected to the column 1. Two hydraulic telescopic rods 4 are hinged to the outer surface of the column 1. The output end of each hydraulic telescopic rod 4 is hinged to the corresponding grab body 2. A gear 5 is fixedly provided on the top end of each hinge rod 3. The central axis of the gear 5 coincides with the rotation axis of the top end of the hinge rod 3, and the two gears 5 mesh with each other.

[0020] In use, the top of the column 1 is connected to the lifting mechanism, which controls the raising and lowering of the column 1, thereby raising and lowering the two grab bucket bodies 2. The lifting mechanism is a conventional lifting mechanism found on cranes, typically consisting of a winch and a wire rope. The wire rope is released and wound up by rotating the winch. The free end of the wire rope is fixed to the top of the column 1, achieving the purpose of raising and lowering the column 1. When lowering the grab bucket bodies 2, the hydraulic telescopic rod 4 retracts, causing the two grab bucket bodies 2 to rotate synchronously. Each grab bucket body 2 rotates around the rotation axis at the top of the hinge rod 3 via a hinge rod 3, keeping both grab bucket bodies 2 in the open state. Figure 2 With both grab bucket bodies 2 in a closed state, Figure 4With both grab bucket bodies 2 in the open state, when they contact the material pile, the hydraulic telescopic rod 4 extends, causing the two grab bucket bodies 2 to rotate synchronously, closing them and grabbing the material. Once fully closed, the lifting mechanism controls the column 1 to rise, thereby lifting the two closed grab bucket bodies 2 to lift the material. Then, the grab bucket bodies 2 are moved to a designated location, and the material is released. However, in the current situation, due to the sequential action of the two hydraulic telescopic rods 4 or mechanical differences between them, the two grab bucket bodies 2 may rotate asynchronously. To address this issue, this application incorporates gears 5. When the two grab bucket bodies 2 rotate, they drive the two hinge rods 3 to rotate synchronously. The synchronous rotation of the two hinge rods 3, in turn, drives the two gears 5 to rotate. Since the two gears 5 mesh with each other, when the two grab bucket bodies 2 rotate asynchronously due to differences in the movement of the two hydraulic telescopic rods 4, the two gears 5 ensure that the two hinge rods 3 rotate synchronously, thereby ensuring the synchronous rotation of the grab bucket bodies 2. At this time, the hydraulic telescopic rod 4 that is lagging behind will be forced to follow the movement of the corresponding hinge rod 3, maintaining consistency with the movement of the other hydraulic telescopic rod 4. Because the lagging hydraulic telescopic rod 4 is forced to accelerate its movement, the return of hydraulic oil inside the lagging hydraulic telescopic rod 4 is accelerated, preventing mutual interference.

[0021] In this embodiment, a fixing block 6 is fixedly installed at the bottom of the column 1, and two hinge rods 3 are fixedly installed on each grab bucket body 2. They are arranged in the front-rear direction on the upper surface of the grab bucket body 2. The top end of the front hinge rod 3 is hinged to the front side of the fixing block 6, and the top end of the rear hinge rod 3 is hinged to the rear side of the fixing block 6. In use, the hydraulic telescopic rod 4 extends and retracts, causing the corresponding grab bucket body 2 to rotate. The rotation of the grab bucket body 2 causes the two corresponding hinge rods 3 to rotate simultaneously, thus achieving the purpose of rotating the grab bucket body 2. The two hinge rods 3 on each grab bucket body 2 increase the stability of the rotation of the grab bucket body 2.

[0022] In this embodiment, a force rod 7 is fixedly installed on the upper end face of each grab body 2, and the top end of each force rod 7 is hinged to the corresponding hydraulic telescopic rod 4. In use, the hydraulic telescopic rod 4 retracts and drives the grab body 2 to rotate through the force rod 7. By setting the force rod 7, the torque of the hydraulic telescopic rod 4 is increased, and the grab body 2 can be closed and opened with a shorter stroke of the hydraulic telescopic rod 4.

[0023] The existing hydraulic telescopic rod 4 includes a cylinder body 8 and an output rod 9. A piston is fixedly mounted on the top of the output rod 9 and slides inside the cylinder body 8. The space inside the cylinder body 8 above the piston is the upper chamber, and the space inside the cylinder body 8 below the piston is the lower chamber. Two oil inlet connectors 10 are fixedly mounted on the cylinder body 8, and the two oil inlet connectors 10 are connected to the upper chamber and the lower chamber, respectively. The hydraulic telescopic rod 4 is generally controlled by controlling the opening and closing of the oil valves at the oil inlet connectors 10. During the initial installation and debugging, the oil valves at the oil inlet connectors 10 are opened simultaneously to extend or retract the hydraulic telescopic rod 4, and then the oil valves at the oil inlet connectors 10 are closed simultaneously to stop the hydraulic telescopic rod 4. Action; Due to the initial debugging, after the oil valves of the oil inlet connectors 10 of the two hydraulic telescopic rods 4 are opened and closed simultaneously, the extension and retraction of the output rods 9 of the two hydraulic telescopic rods 4 may not be equal. At this time, it is necessary to adjust the extension and retraction of the two hydraulic telescopic rods 4 to be equal. The reason may be due to air in the cylinder 8, etc. However, since the two gears 5 are meshed with each other, even if the extension and retraction of the two hydraulic telescopic rods 4 are not equal, it will not be detected. Therefore, it is necessary to set a failure device for gears 5 to complete the initial installation and debugging. The above situation will also occur during normal use, such as when changing the hydraulic oil in the middle, or when repairing and replacing the oil inlet connectors 10, cylinder 8, piston or output rod 9.

[0024] In this embodiment, gear 5 includes a left gear 11 and a right gear 12. A failure device is provided between the left gear 11 and the left hinge rod 3 to switch between two states: fixed position and mutual rotation. When the failure device is closed, the left gear 11 and the left hinge rod 3 remain fixed in position, forming a whole. When the failure device is open, the left gear 11 and the left hinge rod 3 are released from their fixed position and can rotate relative to each other. When it is necessary to check whether the strokes of the two hydraulic telescopic rods 4 are equal, the failure device is activated, and the oil valves of the oil inlet connectors 10 of the two hydraulic telescopic rods 4 are opened simultaneously, causing the output rods 9 of the two hydraulic telescopic rods 4 to extend simultaneously to the closing position of the two grab bodies 2. At the same time, the oil inlet connectors 10 of the two hydraulic telescopic rods 4 are closed. Next, check the oil valves and observe whether the two grab bucket bodies 2 are fully closed. Specifically, make the device vertical and observe whether the two grab bucket bodies 2 are fully closed. If an opening is observed between the two grab bucket bodies 2, it means that the two grab bucket bodies 2 are not fully closed. The closed surface of the grab bucket bodies 2 should be vertical when fully closed. If the closed surface of one of the grab bucket bodies 2 is not vertical, it means that the extension length of the output rod 9 of the hydraulic telescopic rod 4 driving this grab bucket body 2 is less than the length of the output rod 9 of the other hydraulic telescopic rod 4. At this time, the hydraulic telescopic rod 4 needs to be checked and adjusted, such as whether the oil valve opening of the oil inlet connector 10 is in place, and whether there is air in the cylinder 8. After the problem is eliminated, test again until the two grab bucket bodies 2 are in a normal closed state. Then shut down the faulty device.

[0025] In this embodiment, the failure device includes a pin 13 disposed within the hinge rod 3 on the left side. The pin 13 is slidably disposed within the hinge rod 3 on the left side in the front-back direction. The pin 13 is sleeved within a sliding hole 14 opened on the end face of the fixing block 6. A spline 15 is fixedly disposed on the outer end of the pin 13. A bushing 16 is fixedly disposed on the rear side of the left gear 11. The bushing 16 is rotatably connected to the hinge rod 3 on the left side. An internal tooth groove 17 adapted to the spline 15 is opened on the outer side of the left gear 11 in the front-back direction. The spline 15 is engaged with the left gear 11 through the internal tooth groove 17. A through groove communicating with the sliding hole 14 is opened on the left side of the fixing block 6 in the front-back direction. 18. A rotating block 19 is rotatably connected to the inner end of the pin 13. A lever 20 is fixedly installed on the outer surface of the rotating block 19. The lever 20 extends through the through groove 18 to the outside of the fixed block 6. The fixed block 6 has a closing groove 21 opened through the inner bottom wall of the through groove 18 and an opening groove 22 opened through the inner top wall of the through groove 18. During normal use, the lever 20 is located in the closing groove 21, indicating that the failure device is closed. The specific principle is that the rotation of the left grab body 2 drives the left hinge rod 3 to rotate, and the left hinge rod 3 drives the pin 13 to rotate (because the pin 13 and the hinge rod 3 are slidably set, they can only slide relative to each other and cannot slide relative to each other). (Rotation), the pin 13 drives the left gear 11 to rotate via the spline 15 (at this time, the spline 15 is located in the internal tooth groove 17 of the left gear 11), and the rotation of the left grab body 2 can drive the left gear 11 to rotate, which is the closed state of the failure device; when it is necessary to check whether the stroke of the output rod 9 of the two hydraulic telescopic rods 4 is equal, rotate the lever 20 from the closing groove 21 into the through groove 18, and then move the lever 20 outward. The lever 20 drives the pin 13 and spline 15 to move outward. When the lever 20 moves to the opening groove 22, rotate the lever 20 upward so that the lever 20 enters the opening groove 22; at this time, the spline 15 is completely from The left gear 11 disengages from the internal tooth groove 17; at this time, rotating the left grab body 2 drives the left hinge rod 3 to rotate, the left hinge rod 3 drives the pin 13 to rotate, and the pin 13 drives the spline 15 to rotate. Since the spline 15 is located outside the left gear 11, the pin 13 will no longer drive the left gear 11 to rotate, and the rotation of the hinge rod 3 will also not drive the left gear 11 to rotate (because the left gear 11 is rotatably connected to the left hinge rod 3 through the bushing 16). At this time, the device is in a failure state. It is possible to check whether the actions of the two hydraulic telescopic rods 4 are consistent. If the hydraulic telescopic rods 4 are inconsistent, they should be inspected, repaired, or replaced.

[0026] In this embodiment, a receiving groove 23 is provided on the outer side of the hinge rod 3, and the bushing 16 of the left gear 11 is located in the receiving groove 23 and is rotatably connected to the hinge rod 3; when the left gear 11 rotates, it drives the bushing 16 to rotate in the hinge rod 3.

[0027] In this embodiment, the top of the hinge rod 3 is provided with a through hole 24 that matches the pin 13. The hinge rod 3 is fixedly provided with a plurality of guide rails 25 along the left-right direction through the inner sidewall of the through hole 24. The outer surface of the pin 13 is provided with a plurality of guide grooves 26 that match the guide rails 25 along the front-back direction. The pin 13 is slidably connected to the hinge rod 3 through the guide rails 25 and the guide grooves 26. When the pin 13 slides back and forth in the hinge rod 3, it is limited by the guide rails 25 and the guide grooves 26 to prevent the pin 13 from rotating. When the grab body 2 on the left side rotates, it drives the hinge rod 3 on the left side to rotate. The hinge rod 3 on the left side drives the pin 13 to rotate through the cooperation of the guide rails 25 and the guide grooves 26.

[0028] In this embodiment, a spring 27 is fixedly installed between the rotating block 19 and the inner bottom wall of the sliding hole 14. The spring 27 is always in a stretched state. When the lever 20 is located in the closing groove 21 or the opening groove 22, the rotating block 19 will not easily rotate because the spring 27 always has a stretching effect on the rotating block 19, so that the lever 20 is disengaged from the closing groove 21 or the opening groove 22.

[0029] During normal use, the lever 20 is always located in the closing groove 21. To prevent the lever 20 from accidentally detaching from the closing groove 21, in this embodiment, a fixing notch 28 is provided on the outer side of the fixing block 6 at the position corresponding to the closing groove 21; the outer surface of the lever 20 is provided with external threads. When the lever 20 is located in the closing groove 21, a locking nut 29 is screwed onto the lever 20, so that the locking nut 29 abuts against the inner bottom wall of the fixing notch 28, thereby fixing the position of the lever 20 and preventing the lever 20 from detaching from the closing groove 21.

[0030] In this embodiment, a hinge is fixedly provided at the top of the column 1, and the hinge is connected to the free end of the wire rope.

[0031] The working principle of this utility model is as follows: The lifting mechanism controls the column 1 to rise and fall. When the grab bucket is lowered, the hydraulic telescopic rod 4 retracts, causing the two grab bucket bodies 2 to rotate synchronously. Each grab bucket body 2 rotates around the rotation axis at the top of the hinge rod 3 through the hinge rod 3, so that the two grab bucket bodies 2 are in the open state. When the two grab bucket bodies 2 in the open state come into contact with the material pile, the hydraulic telescopic rod 4 is extended, causing the two grab bucket bodies 2 to rotate synchronously, so that the two grab bucket bodies 2 close. During the closing process, the two grab bucket bodies 2 grab the material. When the two grab bucket bodies 2 are fully closed, the lifting mechanism controls the column 1 to rise, thereby driving the two closed grab bucket bodies 2 to rise, achieving the purpose of lifting the material. Then, the grab bucket bodies 2 are moved to the designated location, and the two grab bucket bodies 2 are opened to release the material.

[0032] When it is necessary to check whether the strokes of the output rods 9 of the two hydraulic telescopic rods 4 are equal, rotate the lever 20 from the closing slot 21 into the through slot 18, and then move the lever 20 outward. The lever 20 drives the pin 13 and spline 15 to move outward. When the lever 20 moves to the opening slot 22, rotate the lever 20 upward so that the lever 20 enters the opening slot 22. At this time, the spline 15 is completely disengaged from the internal tooth groove 17 of the left gear 11. At this time, rotate the left grab body 2 to drive the left hinge rod 3 to rotate. The left hinge rod 3 drives the pin 13 to rotate, and the pin 13 drives the spline 15 to rotate. At this time, since the spline 15 is located outside the left gear 11, the pin 13 will no longer drive the left gear 11 to rotate. At the same time, the rotation of the hinge rod 3 cannot drive the left gear 11 to rotate (because the left gear 11 is rotatably connected to the left hinge rod 3 through the bushing 16). At this time, it is the failure state of the faulty device. It is possible to check whether the actions of the two hydraulic telescopic rods 4 are consistent and repair the inconsistent hydraulic telescopic rods 4.

Claims

1. A fan-shaped shell grabber, comprising a column (1) and two grabber bodies (2), characterized in that: Each grab body (2) has a hinge rod (3) fixedly installed on its upper end face. The top of each hinge rod (3) is rotatably connected to the column (1). Two hydraulic telescopic rods (4) are hinged to the outer surface of the column (1). The output end of each hydraulic telescopic rod (4) is hinged to the corresponding grab body (2). A gear (5) is fixedly installed at the top of each hinge rod (3). The central axis of the gear (5) coincides with the rotation axis of the top of the hinge rod (3), and the two gears (5) mesh with each other.

2. The fan-shaped shell grabber according to claim 1, characterized in that: The bottom end of the column (1) is fixedly provided with a fixing block (6), and two hinge rods (3) are fixedly provided on each grab body (2), and are arranged in the front and back direction on the upper surface of the grab body (2). The top end of the front hinge rod (3) is hinged to the front side of the fixing block (6), and the top end of the rear hinge rod (3) is hinged to the rear side of the fixing block (6).

3. The fan-shaped shell grabber according to claim 2, characterized in that: Each grab body (2) has a fixed force rod (7) on its upper end face, and the top of each force rod (7) is hinged to the corresponding hydraulic telescopic rod (4).

4. The fan-shaped shell grabber according to claim 3, characterized in that: The gear (5) includes a left gear (11) and a right gear (12). A failure device is provided between the left gear (11) and the left hinge rod (3) to switch between two states: fixed position and mutual rotation. When the failure device is closed, the left gear (11) and the left hinge rod (3) remain fixed in position and form a whole. When the failure device is opened, the left gear (11) and the left hinge rod (3) are released from fixed position and can rotate with each other.

5. The fan-shaped shell grabber according to claim 4, characterized in that: The failure device includes a pin (13) disposed in the hinge rod (3) on the left side, the pin (13) being slidably disposed in the hinge rod (3) on the left side in the front-back direction; the pin (13) is sleeved in the sliding hole (14) opened on the end face of the fixing block (6), a spline (15) is fixedly disposed on the outer end of the pin (13), a bushing (16) is fixedly disposed on the rear side of the left gear (11), the bushing (16) is rotatably connected to the hinge rod (3) on the left side, and an internal tooth groove (17) adapted to the spline (15) is opened on the outer side of the left gear (11) in the front-back direction; The key (15) is engaged with the left gear (11) through the internal tooth groove (17); the left side of the fixed block (6) is provided with a through groove (18) communicating with the sliding hole (14) along the front-back direction; the inner end of the pin (13) is rotatably connected to the rotating block (19); the outer surface of the rotating block (19) is fixedly provided with a lever (20); the lever (20) extends through the through groove (18) to the outside of the fixed block (6); the fixed block (6) is provided with a closing groove (21) through the inner bottom wall of the through groove (18); the fixed block (6) is provided with an opening groove (22) through the inner top wall of the through groove (18).

6. The fan-shaped shell grabber according to claim 5, characterized in that: The outer side of the hinge rod (3) is provided with a receiving groove (23), and the bushing (16) of the left gear (11) is located in the receiving groove (23) and is rotatably connected to the hinge rod (3).

7. The fan-shaped shell grabber according to claim 5, characterized in that: The top of the hinge rod (3) is provided with a through hole (24) that matches the pin (13). The hinge rod (3) is fixedly provided with a number of guide rails (25) along the left and right direction through the inner side wall of the through hole (24). The outer surface of the pin (13) is provided with a number of guide grooves (26) that match the guide rails (25) along the front and back direction. The pin (13) is slidably connected to the hinge rod (3) through the guide rails (25) and the guide grooves (26).

8. The fan-shaped shell grabber according to claim 5, characterized in that: A spring (27) is fixedly installed between the rotating block (19) and the inner bottom wall of the sliding hole (14), and the spring (27) is always in a stretched state.

9. The fan-shaped shell grabber according to claim 5, characterized in that: The outer side of the fixed block (6) is provided with a fixing notch (28) at the position corresponding to the closing groove (21); the outer surface of the lever (20) is provided with an external thread. When the lever (20) is located in the closing groove (21), a locking nut (29) is screwed on the lever (20) so that the locking nut (29) abuts against the inner bottom wall of the fixing notch (28).

10. The fan-shaped shell grabber according to claim 1, characterized in that: The top of the column (1) is fixedly provided with a hinge.

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