External anti-falling device of quick-change mechanism

Abstract

The utility model belongs to the technical field of robot tool quick change, and particularly relates to an external anti-falling device of a quick change mechanism, which comprises an upper connecting plate and a lower connecting plate, cylinders are arranged at two ends of the upper connecting plate, and cylinder mounting seats are connected to the upper tails of piston rods outside the cylinders. Cylinder guide seats are connected to the upper heads of piston rods outside the cylinders, guide rods are arranged at the two ends of each cylinder guide seat, the guide rods are slidably connected with cylinder mounting seats, springs sleeve the guide rods, clamp bodies are symmetrically arranged on the cylinder mounting seats, the clamp bodies are further connected with the upper connecting plate, and when the piston rods stretch out, cylinder bodies drive the clamp bodies to rotate outwards; and the clamp body hooks the lower connecting plate. Under the dual action of the spring force and the extension thrust of the piston rod of the air cylinder, the external anti-falling device of the quick-change mechanism is kept in a normally-closed state, the falling accident of the actuator is avoided, and the risk that the end actuator falls off due to the fault and misoperation of a quick-change disc is shielded.

Description

Technical Field

[0001] The utility model belongs to the technical field of robot tool quick change, and in particular relates to an external anti-dropping device for a quick change mechanism. Background Art

[0002] In industrial production, a "quick-change mechanism" is generally provided at the end of a power-assisted manipulator to facilitate the rapid replacement of the end effector. For example, the prior art CN209648757U discloses a locking mechanism for a quick-change disc at the end of a robot, which uses pneumatic or hydraulic pressure to drive a piston rod. The front end of the piston rod pushes a steel ball outward to clamp the tool side disc, thereby achieving locking of the robot side disc and the tool side disc. However, in actual production, there is still a risk of the locking system losing pressure and the actuator falling due to equipment failure or misoperation.

[0003] The prior art CN1130848568 discloses that the solenoid valve and the robot action are controlled by setting a soft limit through software. When a gap appears between the robot side plate and the tool side plate, the travel switch is disconnected, and the joints and locking cylinder of the entire robot cannot move. However, if the air circuit or the solenoid valve fails, the actuator will fall. The stability of the solenoid valve and the travel switch is easily affected by electrical and air circuit failures. The safety travel switch is set on one side of the actuator. When the actuator is picked up, the travel switch closes the cylinder action to achieve the locking of the quick-change device. The sleeve and connecting column are intermittently set, and the sleeve is used to abut against two sliding blocks to achieve the locking effect of squeezing and limiting the position of the connecting column. It seems to achieve double protection, but the premise for achieving locking is that the cylinder piston rod extends to deliver the sleeve and the connecting column to the specified position. Once the cylinder loses pressure, the sleeve and the connecting column will also loosen.

[0004] The existing technology has the problems of high cost, complex structure and inconvenient maintenance. At the same time, it cannot avoid the risk of the execution end falling due to equipment failure and misoperation, and cannot provide mandatory protection for workpieces, equipment and operators. Utility Model Content

[0005] The problem to be solved by the utility model is that the prior art cannot avoid the risk of the end effector falling due to equipment failure and misoperation.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A quick-change mechanism external anti-falling device comprises an upper connecting plate and a lower connecting plate. The upper connecting plate is provided with connecting holes at the top and bottom, and the lower connecting plate is provided with a connecting hole. Cylinders are arranged at both ends of the upper connecting plate. The tail of the piston rod outside the cylinder is connected to the cylinder mounting seat, the head of the piston rod outside the cylinder is connected to the cylinder guide seat, and guide rods are arranged at both ends of the cylinder guide seat. The guide rods are slidably connected to the cylinder mounting seat, a spring is sleeved on the guide rod, and a clamp body is symmetrically arranged on the cylinder mounting seat. The clamp body is also connected to the upper connecting plate. When the piston rod is extended, the cylinder body drives the clamp body to rotate outward, and the clamp body hooks the lower connecting plate.

[0008] Furthermore, the upper connecting plate includes a top plate, a support seat, and a flange plate welded in sequence from top to bottom, and top plate connecting seats are symmetrically arranged on the left and right sides of the top surface of the top plate, and the cylinder is connected to the top plate connecting seats.

[0009] Furthermore, rib plate 1 is welded on both sides of the left and right sides of the support seat, and the upper side of rib plate 1 is welded to the top plate, and the lower side of rib plate 1 is welded to the flange; rib plate 2 is welded on the front and rear sides of the support seat, and the upper side of rib plate 2 is welded to the top plate, and the lower side of rib plate 2 is welded to the flange.

[0010] Furthermore, anti-slip grooves are provided on both sides of the bottom surface of the lower connecting plate.

[0011] Furthermore, the cylinder mounting seat includes a cylinder mounting seat base, cylinder mounting seat connecting seats arranged at both ends of the cylinder mounting seat base, and a first spring seat arranged inside each cylinder mounting seat connecting seat. The cylinder mounting seat base is threadedly connected to the cylinder.

[0012] Furthermore, the cylinder guide seat includes a cylinder guide seat base, guide rods arranged at both ends of the cylinder guide seat base, and a second spring seat coaxially arranged on the cylinder guide seat base with each guide rod, the second spring seat and the guide rod are located on the same side of the cylinder guide seat base, the diameter of the second spring seat is larger than the diameter of the guide rod, and the cylinder guide seat base is arranged on the piston rod of the cylinder.

[0013] Furthermore, the guide rod of the cylinder guide seat passes through the cylinder mounting seat base and is slidably connected to the first spring seat.

[0014] Furthermore, a spring is sleeved on the guide rod between the first spring seat of the cylinder mounting seat and the second spring seat of the cylinder guide seat.

[0015] Furthermore, the caliper body includes a caliper body connecting seat at the top, a vertical part integrally formed with the caliper body connecting seat, and an upturned jaw integrally formed with the bottom end of the vertical part. The caliper body connecting seat is connected to the cylinder mounting seat connecting seat, and the upper end of the vertical part of the caliper body is rotatably connected to the cantilever through a pin.

[0016] Furthermore, the jaws are in an upwardly tilted structure relative to the vertical portion of the jaw body.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] (1) The upper connecting plate of the external anti-falling device of the quick-change mechanism of the utility model is fixed to the upper quick-change disk of the quick-change mechanism through the connecting hole at the bottom of the upper connecting plate. In addition, the upper connecting plate and the end of the power-assisting manipulator are fixed by using the connecting hole at the top of the upper connecting plate. The lower connecting plate is used to be fixed to the end actuator below the lower quick-change disk of the quick-change mechanism through the connecting hole on the lower connecting plate. When the piston rod extends out of the cylinder body, the cylinder body moves toward the side away from the upper connecting plate, and the cylinder body drives the cylinder mounting seat to slide along the guide rod toward the side away from the upper connecting plate. The spring force on the guide rod gradually recovers, the upper part of the clamp body rotates toward the side away from the upper connecting plate, and the lower part of the clamp body rotates toward the side close to the upper connecting plate. When the jaws are in contact with the lower connecting plate, the clamp body is closed. Under the dual action of the spring force and the thrust of the cylinder piston rod extending out, the external anti-falling device of the quick-change mechanism remains normally closed. Even if the system loses pressure, the device is in a normally closed state due to the spring force, which will only cause the quick-change mechanism to be unable to open and will not cause the actuator to fall, thus shielding the risk of the end effector falling due to quick-change disk failure and misoperation.

[0019] (2) Anti-skid grooves are arranged on both sides of the bottom surface of the lower connecting plate of the external anti-drop device of the quick-change mechanism of the utility model, and the upturned jaws of the pliers body fit tightly with the anti-skid grooves when in contact with them, thereby preventing the pliers body from slipping off.

[0020] (3) The external anti-dropping device of the quick-change mechanism of the utility model can be disassembled and independently of the quick-change mechanism, which is convenient for maintenance. It is not necessary to replace the entire quick-change mechanism during maintenance. The utility model is suitable for maintenance and upgrading of a large number of quick-change mechanisms installed in service. It has the characteristics of easy installation, reliable structure, and good maintenance economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the external anti-falling device of the quick-change mechanism of the utility model;

[0022] Figure 2 For the utility model Figure 1 A top view of

[0023] Figure 3 It is a structural schematic diagram of the upper connecting plate of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the lower connecting plate of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the cylinder of the utility model;

[0026] Figure 6 It is a structural schematic diagram of the cylinder mounting seat of the utility model;

[0027] Figure 7 It is a structural schematic diagram of the cylinder guide seat of the utility model;

[0028] Figure 8 It is a structural schematic diagram of the clamp body of the utility model.

[0029] Reference numerals:

[0030] 1-upper connecting plate; 11-top plate; 12-support seat; 13-flange; 14-rib plate one; 15-rib plate two; 16-top plate connecting seat; 17-cantilever; 2-lower connecting plate; 21-anti-skid groove; 3-cylinder; 31-cylinder body; 32-piston rod; 33-cylinder connecting seat; 34-locking nut; 4-cylinder mounting seat; 41-cylinder mounting seat base; 42-cylinder mounting seat connecting seat; 43-first spring seat; 5-cylinder guide seat; 51-cylinder guide seat base; 52-second spring seat; 53-guide rod; 6-clamp body; 61-clamp body connecting seat; 62-vertical part; 63-jaw; 7-spring; 8-upper quick-change plate; 9-lower quick-change plate; 10-end actuator. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of the utility model.

[0032] It should be noted that the terms "center", "up", "down", "horizontal", "left", "right", "front", "back", "lateral", "longitudinal", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0033] like Figure 1 As shown, the utility model provides an external anti-drop device for a quick-change mechanism, and the quick-change mechanism is connected to the inside of the external anti-drop device for the quick-change mechanism to prevent the quick-change mechanism from falling off. The quick-change mechanism includes an upper quick-change plate 8 and a lower quick-change plate 9, the upper quick-change plate 8 is used to connect to the wind, water, electricity, and gas at the end of the power-assisting manipulator, and the lower quick-change plate 9 is used to connect to the wind, water, electricity, and gas at the end effector 10.

[0034] The external anti-drop device of the quick-change mechanism includes an upper connecting plate 1 for connecting to the upper quick-change disk 8 and a lower connecting plate 2 connected to the lower quick-change disk 9. The external anti-drop device of the quick-change mechanism is a left-right symmetrical structure. The left and right sides of the upper connecting plate 1 are symmetrically provided with clamp bodies 6. The ends of the clamp bodies 6 on the left and right sides of the upper connecting plate 1 can hook the left and right sides of the lower connecting plate 2 respectively. This provides mandatory mechanical protection for the quick-change mechanism and avoids the risk of the end effector 10 falling. The external anti-drop device of the quick-change mechanism is independently provided with the quick-change mechanism, rather than developing a new type of quick-change mechanism or modifying it. It is an additional protection added to the quick-change mechanism, so that it can be more flexibly applied to maintenance scenarios, without having to replace the quick-change mechanism as a whole, and the maintenance cost is lower.

[0035] Specifically, Figure 3 As shown, the upper connecting plate 1 includes a top plate 11, a support seat 12, and a flange 13 which are welded and fixed in sequence from top to bottom. The support seat 12 and the flange 13 are located in the middle position below the top plate 11. Rib plates 14 are welded on both the left and right sides of the support seat 12, and the upper side of the rib plate 14 is welded to the top plate 11, and the lower side of the rib plate 14 is welded to the flange 13; rib plates 2 15 are welded on the front and rear sides of the support seat 12, and the upper side of the rib plate 2 15 is welded to the top plate 11, and the lower side of the rib plate 2 15 is welded to the flange 13. Rib plates 14 and 15 are used to further improve the overall rigidity of the structure of the upper connecting plate 1 and reduce the deflection of the upper connecting plate 1.

[0036] The upper connecting plate 1 is a bilaterally symmetrical structure. Top plate connecting seats 16 are welded on the left and right sides of the top surface of the top plate 11 , and cantilevers 17 are welded on the left and right sides of the bottom surface of the upper connecting plate 1 .

[0037] The top plate 11 of the upper connecting plate 1 is provided with a plurality of threaded holes, and the top plate 11 is threadedly connected to the end of the power assist manipulator by bolts. The flange 13 is provided with a plurality of threaded holes, and the flange 13 is threadedly connected to the upper quick-change plate 8 by bolts. The lower connecting plate 2 is provided with a plurality of threaded holes, and the lower connecting plate 2 is threadedly connected to the end effector 10 below the lower quick-change plate 9 by bolts.

[0038] like Figure 4 As shown, anti-slip grooves 21 are provided on both sides of the bottom surface of the lower connecting plate 2 to ensure that the caliper bodies 6 on the left and right sides of the upper connecting plate 1 are tightly fitted when contacting the lower connecting plate 2 to prevent the caliper bodies 6 from slipping off. The lower connecting plate 2 is subjected to quenching and low-temperature tempering heat treatment to improve the bending strength, wear resistance and overall hardness of the lower connecting plate 2, so as to improve the anti-loosening performance of the external anti-dropping device of the quick-change mechanism itself.

[0039] The following is an explanation of the left side of the external anti-falling device of the quick-change mechanism. The structure of the right side of the external anti-falling device of the quick-change mechanism is symmetrical with the left side and will not be introduced again.

[0040] Combination Figure 1 , Figure 2 As shown, the top plate connecting seat 16 at the left end of the upper connecting plate 1 is connected to the cylinder 3 through a pin. Specifically, as shown in FIG. Figure 5 As shown, the cylinder 3 includes a cylinder body 31, a piston rod 32 connected to one end of the cylinder body 31, a cylinder connecting seat 33 threadedly connected to one end of the piston rod 32, and a locking nut 34 threadedly connected to the piston rod 32. The air inlet and outlet on the cylinder body 31 close to the piston rod is port B, and the air inlet and outlet on the cylinder body 31 away from the piston rod is port A. Figure 1 As shown, the cylinder connection seat 33 is connected to the top plate connection seat 16 by pins, thereby connecting the cylinder 3 to the upper connection plate 1.

[0041] Combination Figure 1 , Figure 2 As shown, the cylinder 3 is threadedly connected to the cylinder mounting seat 4, as shown in FIG. Figure 6 As shown, the cylinder mounting seat 4 includes a cylinder mounting seat base 41, a cylinder mounting seat connecting seat 42 welded to both ends of the cylinder mounting seat base 41, and a first spring seat 43 welded to the inner side of each cylinder mounting seat connecting seat 42. The cylinder mounting seat base 41 is provided with a plurality of threaded holes, such as Figure 2 As shown, the cylinder mounting seat base 41 is threadedly connected to the cylinder body 31 via hexagon socket bolts, thereby connecting the cylinder 3 to the cylinder mounting seat 4.

[0042] Combination Figure 1 , Figure 2 As shown, the piston rod 32 of the cylinder 3 is connected to a cylinder guide seat 5, as shown in FIG. Figure 7 As shown, the cylinder guide seat 5 includes a cylinder guide seat base 51, guide rods 53 welded at both ends of the cylinder guide seat base 51, and a second spring seat 52 coaxially welded to the cylinder guide seat base 51 with each guide rod 53. The second spring seat 52 and the guide rod 53 are located on the same side of the cylinder guide seat base 51, and the diameter of the second spring seat 52 is larger than the diameter of the guide rod 53. Figure 2 As shown, the cylinder guide seat base 51 is connected to the piston rod 32 between the cylinder connecting seat 33 and the locking nut 34 of the cylinder 3. The cylinder guide seat 5 is used to guide the movement path of the cylinder 3.

[0043] like Figure 2 As shown, the guide rod 53 of the cylinder guide seat 5 passes through the cylinder mounting seat base 41 and is slidably connected to the first spring seat 43 on the same side. The guide rod 53 between the first spring seat 43 of the cylinder mounting seat 4 and the second spring seat 52 of the cylinder guide seat 5 is sleeved with a spring 7, and the spring 7 telescopically moves between the first spring seat 43 and the second spring seat 52. When the external anti-dropping device of the quick-change mechanism is opened, the spring force needs to be overcome, and the external anti-dropping device of the quick-change mechanism is kept normally closed by relying on the spring force.

[0044] Combination Figure 1 , Figure 2 As shown, the cylinder mounting seat 4 is rotatably connected with a clamp body 6. Figure 8 As shown, the pliers body 6 includes a pliers body connection seat 61 integrally formed at the top, a vertical portion 62 integrally formed with the pliers body connection seat 61, and an upwardly tilted jaw 63 integrally formed with the bottom end of the vertical portion 62. The pliers body 6 is made of a whole piece of steel plate through wire cutting, which not only ensures that the jaw 63 fits tightly with the lower connecting plate 2, but also ensures the structural strength of the entire pliers body 6. Figure 2 As shown, the caliper body connecting seat 61 and the cylinder mounting seat connecting seat 42 are rotatably connected through a pin, as shown in FIG. Figure 1 As shown, the upper end of the vertical portion 62 of the caliper body 6 is rotatably connected to the corresponding cantilever 17 through a pin, thereby connecting the upper connecting plate 1 to the caliper body 6, connecting the caliper body 6 to the cylinder mounting seat 4, and making the upper connecting plate 1, the cantilever 17, the caliper body 6 and the cylinder 3 form a lever structure, without using electrical components such as solenoid valves and travel switches, it can shield its own electrical faults, and has a simple structure and is easy to maintain.

[0045] like Figure 1 As shown, the upward tilt of the jaw 63 faces the inner side of the external anti-dropping device of the entire quick-change mechanism. Preferably, the angle between the jaw 63 and the vertical portion 62 of the jaw body 6 is 83°.

[0046] Combination Figure 1 , Figure 2 As shown, the right and left ends of the quick-change mechanism external anti-dropping device are symmetrically provided with a cylinder 3, a cylinder mounting seat 4, a cylinder guide seat 5, and a clamp body 6, which will not be introduced again. The right end of the quick-change mechanism external anti-dropping device is taken as an example to explain the working principle.

[0047] How it works

[0048] When compressed air enters the cylinder 3 through port B, the piston rod 32 retracts into the cylinder body 31, and the cylinder body 31 moves toward the side close to the upper connecting plate 1. The cylinder body 31 drives the cylinder mounting seat 4 to slide along the guide rod 53 toward the side close to the upper connecting plate 1. The spring 7 on the guide rod 53 is squeezed, and the cylinder mounting seat 4 drives the pliers body 6 to overcome the spring force. The pliers body 6 rotates clockwise with the pin of the vertical portion 62 as the rotation center. The upper part of the pliers body 6 rotates toward the side close to the upper connecting plate 1, and the lower part of the pliers body 6 rotates away from the upper connecting plate 1. The jaws 63 are released from the anti-slip groove 21 of the lower connecting plate 2, so that the pliers body 6 overcomes the spring force and opens toward the side away from the upper connecting plate 1, and the external anti-falling device of the quick-change mechanism opens.

[0049] When compressed air enters the cylinder 3 through port A, the piston rod 32 extends out of the cylinder body 31, and the cylinder body 31 moves away from the upper connecting plate 1. The cylinder body 31 drives the cylinder mounting seat 4 to slide along the guide rod 53 away from the upper connecting plate 1. The elastic force of the spring 7 on the guide rod 53 gradually recovers, and the pliers body 6 rotates counterclockwise with the pin of the vertical portion 62 as the rotation center. The upper part of the pliers body 6 rotates away from the upper connecting plate 1, and the lower part of the pliers body 6 rotates toward the side close to the upper connecting plate 1. When the jaws 63 are in contact with the anti-slip groove 21 of the lower connecting plate 2, under the dual action of the spring force and the thrust of the cylinder piston rod, the external anti-falling device of the quick-change mechanism is closed.

[0050] When the cylinder 3 loses pressure, the external anti-dropping device of the quick-change mechanism also remains normally closed due to the spring force, which only causes the quick-change disk to be unable to open, thereby ensuring that the end effector 10 will not fall.

[0051] The external anti-dropping device of the quick-change mechanism of the utility model is a purely mechanical structure, which utilizes the upper connecting plate 1, the pin shaft, the caliper body 6 and the cylinder 3 to form a lever structure, does not use electrical components such as solenoid valves and travel switches, can shield its own electrical faults, and has a simple structure and is easy to maintain.

[0052] The external anti-dropping device of the quick-change mechanism of the utility model relies on spring force to keep the mechanism normally closed, an upturned jaw 63 is provided at the end of the pliers body 6, and an anti-slip groove 21 is provided at the position where the lower connecting plate 2 contacts the pliers body 6. These three design details improve the anti-loosening performance of the device itself from a structural perspective.

[0053] The external anti-falling device of the quick-change mechanism of the utility model is an additional protection for the existing quick-change mechanism. It does not need to replace the entire quick-change mechanism. It is suitable for repairing and upgrading a large number of quick-change mechanisms with similar publication number CN209648757U. It has the characteristics of easy installation, reliable structure and good maintenance economy.

[0054] Different from the anti-falling system described in patent publication number CN1130848568, the present anti-falling device exists independently and does not change the structure of the upper and lower quick-change disks. There is no need to replace the upper and lower quick-change disks when maintaining the equipment, which provides a more economical solution for repairing quick-change disk fall failures. The entire anti-falling device is composed of a purely mechanical structure. Thanks to its normally closed structure, even if the system loses pressure, it will only cause the quick-change disk to be unable to open, and the actuator will not fall, thereby shielding the actuator from falling accidents caused by quick-change disk failures and misoperation.

[0055] In actual engineering applications, this anti-falling device is used to repair the quick-change disc falling failure of an assistive manipulator. When the external anti-falling device of the quick-change mechanism of the utility model was not used, the assistive manipulator had three quick-change disc falling failures in a year, which were sporadic failures without obvious regularity. In order to avoid the risk of injury, this external anti-falling device of the quick-change mechanism of the present embodiment is specially made. So far, no quick-change disc falling accidents have occurred, and it has withstood the actual test of the project, confirming that its structure is reliable.

[0056] The above technical features constitute the best implementation example of the present utility model, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

[0057] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Simple modifications or equivalent substitutions of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. An external anti-drop device for a quick-change mechanism, characterized in that: It includes an upper connecting plate and a lower connecting plate. The upper connecting plate is provided with connecting holes at the top and bottom, and the lower connecting plate is provided with a connecting hole. Cylinders are arranged at both ends of the upper connecting plate. The tail of the piston rod outside the cylinder is connected to the cylinder mounting seat, the head of the piston rod outside the cylinder is connected to the cylinder guide seat, and guide rods are arranged at both ends of the cylinder guide seat. The guide rods are slidably connected to the cylinder mounting seat, a spring is sleeved on the guide rod, and a clamp body is symmetrically arranged on the cylinder mounting seat, and the clamp body is also connected to the upper connecting plate. When the piston rod is extended, the cylinder body drives the clamp body to rotate outward, and the clamp body hooks the lower connecting plate.

2. The external anti-drop device of the quick-change mechanism according to claim 1 is characterized in that: The upper connecting plate comprises a top plate, a supporting seat and a flange plate which are welded in sequence from top to bottom. Top plate connecting seats are symmetrically arranged on the left and right sides of the top surface of the top plate, and the cylinder is connected to the top plate connecting seats.

3. The external anti-drop device of the quick-change mechanism according to claim 2 is characterized in that: Rib plate 1 is welded on both sides of the left and right sides of the support seat, and the upper side of rib plate 1 is welded to the top plate, and the lower side of rib plate 1 is welded to the flange; rib plate 2 is welded on the front and rear sides of the support seat, and the upper side of rib plate 2 is welded to the top plate, and the lower side of rib plate 2 is welded to the flange.

4. The external anti-drop device of the quick-change mechanism according to claim 1 is characterized in that: Anti-slip grooves are arranged on both sides of the bottom surface of the lower connecting plate.

5. The external anti-drop device of the quick-change mechanism according to any one of claims 1 to 4, characterized in that: The cylinder mounting seat comprises a cylinder mounting seat base, cylinder mounting seat connecting seats arranged at both ends of the cylinder mounting seat base, and a first spring seat arranged inside each cylinder mounting seat connecting seat. The cylinder mounting seat base is threadedly connected to the cylinder.

6. The external anti-drop device of the quick-change mechanism according to claim 5, characterized in that: The cylinder guide seat includes a cylinder guide seat base, guide rods arranged at both ends of the cylinder guide seat base, and a second spring seat coaxially arranged on the cylinder guide seat base with each guide rod. The second spring seat and the guide rod are located on the same side of the cylinder guide seat base. The diameter of the second spring seat is larger than the diameter of the guide rod. The cylinder guide seat base is arranged on the piston rod of the cylinder.

7. The external anti-drop device of the quick-change mechanism according to claim 6, characterized in that: The guide rod of the cylinder guide seat passes through the cylinder mounting seat base and is slidably connected with the first spring seat.

8. The external anti-drop device of the quick-change mechanism according to claim 7, characterized in that: A spring is sleeved on the guide rod between the first spring seat of the cylinder mounting seat and the second spring seat of the cylinder guide seat.

9. The external anti-drop device of the quick-change mechanism according to claim 5, characterized in that: The pliers body comprises a pliers body connection seat at the top, a vertical part integrally formed with the pliers body connection seat, and an upturned jaw integrally formed with the bottom end of the vertical part. The pliers body connection seat is connected to the cylinder mounting seat connection seat, and the upper end of the vertical part of the pliers body is rotatably connected to the cantilever through a pin.

10. The external anti-drop device of the quick-change mechanism according to claim 9, characterized in that: The jaws are in an upwardly tilted structure relative to the vertical portion of the jaw body.

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