Upper hook frame assembly of electric chain hoist

Abstract

The invention relates to the technical field of electric hoist equipment accessories, in particular to an upper hook frame assembly of an electric chain hoist, which comprises a hook frame body, a rotating mechanism and an interlocking mechanism, a through hole is formed in the upper hook frame body in a penetrating manner, a lifting hook is inserted into the through hole, and the rotating mechanism is arranged on the upper hook frame body and the lifting hook; the interlocking mechanism is arranged on the upper hook frame body and the lifting hook, and rotation of the upper hook frame body at any angle is achieved through cooperation of a ratchet wheel fixedly arranged on the lifting hook and a pawl on one side. According to the design, the angle of the upper hook frame body is allowed to be flexibly adjusted when a load is hung, the operation convenience of equipment is improved, complete failure of the equipment caused by breakage of the fixing bolt is avoided through the interlocking mechanism, and the maintainability and practicability of the equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of accessories for electric hoist equipment, and particularly to an upper hook frame assembly of a ring chain electric hoist. Background Art

[0002] A ring chain electric hoist is a small lifting device widely used in industries, construction, logistics and other fields. It consists of a motor, a transmission mechanism and a sprocket. The ring chain electric hoist drives a reduction gearbox through a motor, so that the output shaft of the reduction gearbox drives the ring sprocket to rotate. The output shaft of the reduction gearbox drives the ring sprocket to rotate through gear transmission. During the rotation of the ring sprocket, the chain moves. The chain is fixed by two lifting hooks. When the ring sprocket drives the chain to move upward, the lifting hooks also rise accordingly. The upper hook frame assembly of the ring chain electric hoist is one of the key components of the equipment, which undertakes the functions of hanging and fixing the hook and ensuring the stable lifting of heavy objects.

[0003] During the operation of the ring chain electric hoist, the upper hook is the part suspended at a fixed position, which is used to bear the weight of the entire electric hoist itself plus the weight of the heavy object. The upper hook is a component connecting the electric hoist and the support structure, ensuring that the electric hoist can be stably suspended at a fixed position. When the hook-up position of the workpiece on the ground is not on the same horizontal line as the hook, it will cause greater lateral forces on the hook and the chain during the lifting and lowering process. Due to the influence of the lateral force, when the workpiece is lifted, it will generate a certain degree of swing. The swing may cause the workpiece to fail to be stably positioned, and collisions, falls and other accidents may occur during the swing process, causing harm to the staff and the surrounding environment. In addition, when the electric hoist is applied to the operation, the quality of the workpiece is generally large. When the device is overloaded, the internal clamping parts of the electric hoist will bear greater stress, resulting in fracture problems, leading to the failure of the overall structure of the electric hoist, and thus causing safety accidents such as the falling of the workpiece. At the same time, this excessive stress may also damage other components of the electric hoist (such as the chain, hook, motor, etc.). This will increase the maintenance cost and may affect the overall performance and life of the electric hoist. Summary of the Invention

[0004] Based on the above problems existing in the prior art, the problem to be solved by the present application is: the problem of angle adjustment of the upper hook frame of the ring chain electric hoist and device overload protection.

[0005] The technical solution adopted by the present application to solve its technical problems is: an upper hook frame assembly of a ring chain electric hoist, including: an upper hook frame body, a through hole is penetrated through the upper hook frame body, a hook is inserted into the through hole, and further includes, a rotating mechanism, the rotating mechanism is arranged on the upper hook frame body and the hook, the rotating mechanism includes a ratchet fixedly arranged on the hook, a pawl is arranged on one side of the ratchet, and the rotating mechanism is used for rotating the upper hook frame body at any angle; Interlocking mechanism, the interlocking mechanism is arranged on the upper hook frame body and the hook, the interlocking mechanism includes a limit block arranged at the bottom of the hook, an annular block is fixedly arranged on the limit block, and a plurality of grooves are equidistantly arranged on the annular block. Fixed blocks are slidably arranged on the inner walls of the plurality of grooves, and the interlocking mechanism is used to prevent the upper hook frame body from falling off and loosening.

[0006] Preferably, a pin is penetrated through the hook, torsion springs I are symmetrically arranged on the pin, a tongue piece is rotatably arranged between the torsion springs I through the pin, and the end of the tongue piece is stuck at the pointed end of the hook.

[0007] Preferably, the rotating mechanism further includes a cushion block I arranged on the upper hook frame body, and the cushion block I is fixedly connected with the upper hook frame body through bolts.

[0008] Preferably, a connecting shaft is fixedly arranged on the cushion block I, a torsion spring II is sleeved on the connecting shaft, a ratchet pawl is rotatably connected above the torsion spring II through the connecting shaft, and the end of the ratchet pawl is stuck on the tooth of the ratchet wheel.

[0009] Preferably, a cylindrical groove is opened on the cushion block I, a rotating rod is threadedly connected in the cylindrical groove, and a resisting block is fixedly arranged in the middle of the rotating rod.

[0010] Preferably, a through groove is further opened on the cushion block I, the through groove is communicated with the cylindrical groove, a resisting plate is slidably arranged on the inner wall of the through groove, the middle of the resisting plate is penetrated by the rotating rod, and a spring I is sleeved on the rotating rod on the side of the resisting plate away from the resisting block.

[0011] Preferably, the interlocking mechanism further includes a through hole penetrating through the bottom of the hook, a fixing bolt is penetrated through the through hole, a cushion block II is sleeved on the hook, a limit block is arranged below the cushion block II, and a plurality of arc grooves are equidistantly arranged on the limit block, and the size of the arc grooves is adapted to the diameter of the fixing bolt.

[0012] Preferably, an annular block is fixedly sleeved on the outer surface of the limit block, a spring II is fixedly arranged in a plurality of grooves on the outer surface of the annular block, and the spring II is fixedly connected with the end of the fixed block.

[0013] Preferably, the end of the fixed block away from the bottom of the groove is set to be arc-shaped and fits with the upper hook frame body, a clamping groove is opened on the upper hook frame body, the clamping groove is set to be annular, and the width of the clamping groove is greater than the diameter of the fixed block.

[0014] Preferably, an installation groove is further formed at the bottom of the hook, a rotating block is rotatably connected in the installation groove, a fixing rod is fixedly arranged at the bottom of the rotating block, a limiting groove is further formed on the upper hook frame body, the width of the limiting groove is adapted to the diameter of the fixing rod, and both ends of the fixing rod are located in the limiting groove.

[0015] The beneficial effects of this application are as follows: For the upper hook frame assembly of a ring chain electric hoist provided in this application, the cooperation between the ratchet fixedly arranged on the hook and the ratchet pawl on one side realizes the arbitrary angle rotation of the upper hook frame body. This design allows the upper hook frame body to flexibly adjust the angle when suspending a load, improving the operation convenience of the equipment. Through the interaction between the ratchet and the ratchet pawl, the operator can easily rotate the upper hook frame body to the required angle to meet different lifting requirements.

[0016] For the upper hook frame assembly of a ring chain electric hoist provided in this application, an annular block is fixed on the limiting block arranged at the bottom of the hook, and the equally spaced grooves on the annular block are used to accommodate the fixing blocks. The fixing blocks slide in the grooves to ensure the firm and reliable connection between the upper hook frame body and the hook, effectively preventing detachment and loosening caused by vibration or impact during use. The interlocking mechanism ensures the firm and reliable connection between the upper hook frame body and the hook through the cooperation of the fixing blocks and the grooves, preventing detachment and loosening, and improving the safety of the equipment.

[0017] For the upper hook frame assembly of a ring chain electric hoist provided in this application, the fixing bolt is caught in the arc-shaped groove of the limiting block under the action of gravity, realizing the preliminary fixation of the upper hook frame body and the hook. This design utilizes the action of gravity to make the fixing bolt firmly stuck in the arc-shaped groove and not easy to loosen. Rotating the fixing rod to make it rotate and catch in the limiting groove realizes the secondary fixation. This double locking mechanism further enhances the connection stability between the upper hook frame body and the hook.

[0018] In addition to the purposes, features and advantages described above, this application has other purposes, features and advantages. The following will refer to the drawings to make a further detailed description of this application. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 The enlarged structural schematic diagram at position A in Figure 3 It is a schematic diagram of the overall structure of the present invention from another perspective; Figure 4 It is a schematic diagram of the structure of the present invention after removing the upper hook frame body; Figure 5 It is a schematic diagram of the overall longitudinal sectional structure of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the structure at B in the middle; Figure 7 It is a schematic diagram of the overall longitudinal section structure of the present invention from another viewing angle; Figure 8 It is a schematic diagram of the overall explosion structure of the present invention; Figure 9 It is a schematic diagram of the cross-section structure of the hook frame body in the figure of the present invention.

[0020] Description of the figure number: 1. Upper hook frame body; 2. Through hole; 3. Hook; 4. Latch; 5. Torsion spring 1; 6. Tongue; 7. Rotating mechanism; 8. Pad 1; 9. Ratchet; 10. Connecting shaft; 11. Torsion spring 2; 12. Ratchet; 13. Column groove; 14. Rotating rod; 15. Block; 16. Through groove; 17. Plate; 18. Spring 1; 19. Interlocking mechanism; 20. Through hole; 21. Fixing bolt; 22. Pad 2; 23. Limiting block; 24. Arc groove; 25. Annular block; 26. Recess; 27. Spring 2; 28. Fixing block; 29. ​​Slot; 30. Mounting groove; 31. Rotating block; 32. Fixing rod; 33. Limiting groove. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0023] Please refer to Figures 1 to 9 A hook frame assembly of a chain electric hoist includes: an upper hook frame body 1, a through hole 2 is formed through the upper hook frame body 1, a hook 3 is inserted into the through hole 2, the upper hook frame body 1 serves as a basic structure, and the upper hook frame body 1 is connected to the hook 3 through the through hole 2 to ensure that the hook 3 can stably hang the load.

[0024] It also includes a rotating mechanism 7. The rotating mechanism 7 is arranged on the upper hook frame body 1 and the lifting hook 3. The rotating mechanism 7 includes a ratchet wheel 9 fixedly arranged on the lifting hook 3. A ratchet pawl 12 is arranged on one side of the ratchet wheel 9. The rotating mechanism 7 is used for rotating the upper hook frame body 1 at any angle. The rotating mechanism 7 enables the upper hook frame body 1 to rotate at any angle, improving the operation flexibility of the equipment and facilitating its use under different working conditions.

[0025] Through the cooperation of the ratchet wheel 9 fixedly arranged on the lifting hook 3 and the ratchet pawl 12 on one side, the upper hook frame body 1 can rotate at any angle. This design allows the upper hook frame body 1 to flexibly adjust the angle when suspending a load, improving the operation convenience of the equipment. Through the interaction between the ratchet wheel 9 and the ratchet pawl 12, the operator can easily rotate the upper hook frame body 1 to the required angle to meet different lifting requirements.

[0026] It also includes an interlocking mechanism 19. The interlocking mechanism 19 is arranged on the upper hook frame body 1 and the lifting hook 3. The interlocking mechanism 19 includes a limit block 23 arranged at the bottom of the lifting hook 3. An annular block 25 is fixedly arranged on the limit block 23. A number of grooves 26 are equidistantly arranged on the annular block 25. Fixed blocks 28 are slidably arranged on the inner walls of the number of grooves 26. The interlocking mechanism 19 is used to prevent the upper hook frame body 1 from falling off and loosening. An annular block 25 is fixed on the limit block 23 arranged at the bottom of the lifting hook 3. The grooves 26 equidistantly arranged on the annular block 25 are used to accommodate the fixed blocks 28. The fixed blocks 28 slide in the grooves 26 to ensure the firm connection between the upper hook frame body 1 and the lifting hook 3, effectively preventing falling off and loosening caused by vibration or impact during use. The interlocking mechanism 19 ensures the stable connection between the upper hook frame body 1 and the lifting hook 3 through the cooperation of the fixed blocks 28 and the grooves 26, preventing falling off and loosening, and improving the safety of the equipment.

[0027] Among them, a pin 4 penetrates through the lifting hook 3. Torsion springs 5 are symmetrically arranged on the pin 4. A tongue piece 6 is rotatably arranged between the torsion springs 5 through the pin 4. The end of the tongue piece 6 is stuck at the tip of the lifting hook 3. The torsion springs 5 are symmetrically arranged on the pin 4 and rotate through the pin 4, providing continuous elastic force for the tongue piece 6 to ensure that the tongue piece 6 can be tightly stuck at the tip of the lifting hook 3. The tongue piece 6 is rotatably arranged through the pin 4, and its end is stuck at the tip of the lifting hook 3, further strengthening the connection between the lifting hook 3 and the upper hook frame body 1. The design of the tongue piece 6 enables the lifting hook 3 to be more stable when bearing a load, effectively preventing loosening caused by vibration or impact.

[0028] Further, please refer to Figures 1 to 8, the rotating mechanism 7 further includes a first cushion block 8 provided on the upper hook frame body 1. The first cushion block 8 is fixedly connected to the upper hook frame body 1 by bolts. A connecting shaft 10 is fixedly provided on the first cushion block 8. A second torsion spring 11 is sleeved on the connecting shaft 10. Above the second torsion spring 11, a pawl 12 is rotatably connected by the connecting shaft 10. The end of the pawl 12 is stuck on the teeth of the ratchet wheel 9.

[0029] The first cushion block 8 is fixedly arranged on the upper hook frame body 1 through bolts, providing it with a stable support. The design of the second torsion spring 11 enables the pawl 12 to be tightly stuck on the teeth of the ratchet wheel 9, further strengthening the stability of the rotating mechanism 7. The pawl 12 is rotatably connected by the connecting shaft 10, enabling the upper hook frame body 1 to easily rotate at any angle, improving the operation flexibility of the equipment. It effectively avoids the problem that the hook-up position of the workpiece on the ground is not on the same horizontal line as the lifting hook 3, reduces the influence of the lateral force on the workpiece lifting process, and improves the stability and safety of the workpiece lifting process.

[0030] It is worth mentioning that, please refer to Figures 4 to 8 , a cylindrical groove 13 is opened on the first cushion block 8. A rotating rod 14 is threadedly connected in the cylindrical groove 13. A resisting block 15 is fixedly provided in the middle of the rotating rod 14. A through groove 16 is also opened on the first cushion block 8. The through groove 16 communicates with the cylindrical groove 13. A resisting plate 17 is slidably arranged on the inner wall of the through groove 16. The middle of the resisting plate 17 is penetrated by the rotating rod 14. A first spring 18 is sleeved on the rotating rod 14 on the side of the resisting plate 17 away from the resisting block 15.

[0031] Through the resisting block 15 on the rotating rod 14, the resisting plate 17 can tightly press against the pawl 12, realizing the positioning and fixing of the pawl 12. The two-way locking prevents the workpiece from shaking caused by the instability of the connection between the lifting hook 3 and the upper hook frame body 1 during the lifting process. When it is necessary to adjust the position of the upper hook frame body 1, only need to rotate the rotating rod 14, prompting the elastic force of the first spring 18 to reset the resisting plate 17, and then releasing the limit of the resisting plate 17 on the pawl 12. The upper hook frame body 1 can be adjusted at any angle so that the hook-up position of the workpiece on the ground is on the same horizontal line as the lifting hook 3, increasing the stability of the lifting work.

[0032] Specifically, please refer to Figures 5 to 9, the interlocking mechanism 19 further includes a through hole 20 penetratingly formed at the bottom of the hook 3. A fixing bolt 21 is inserted through the through hole 20. A second cushion block 22 is sleeved on the hook 3. A limiting block 23 is arranged below the second cushion block 22. A plurality of arc-shaped grooves 24 are equidistantly formed on the limiting block 23. The size of the arc-shaped grooves 24 is adapted to the diameter of the fixing bolt 21. An annular block 25 is fixedly sleeved on the outer surface of the limiting block 23. A second spring 27 is fixedly arranged in a plurality of grooves 26 on the outer surface of the annular block 25. The second spring 27 is fixedly connected to the end of the fixing block 28. One end of the fixing block 28 away from the bottom of the groove 26 is arc-shaped and fits with the upper hook frame body 1. A clamping groove 29 is formed on the upper hook frame body 1. The clamping groove 29 is annular. The width of the clamping groove 29 is greater than the diameter of the fixing block 28.

[0033] When the fixing bolt 21 breaks, the fixing block 28 is clamped into the clamping groove 29, realizing the emergency connection between the upper hook frame body 1 and the hook 3, providing additional safety protection for the equipment. Even if the fixing bolt 21 fails, the equipment can still maintain a certain stability. Due to the existence of the emergency connection mechanism, the upper hook frame body 1 and the hook 3 remain connected, providing enough time for maintenance personnel to repair or replace components. This design avoids the complete failure of the equipment caused by the breakage of the fixing bolt 21, improving the maintainability and practicality of the equipment.

[0034] Furthermore, please refer to Figure 7 and Figure 9 , an installation groove 30 is further formed at the bottom of the hook 3. A rotating block 31 is rotatably connected in the installation groove 30. A fixing rod 32 is fixedly arranged at the bottom of the rotating block 31. A limiting groove 33 is further formed on the upper hook frame body 1. The width of the limiting groove 33 is adapted to the diameter of the fixing rod 32. Both ends of the fixing rod 32 are located in the limiting groove 33.

[0035] By the fixing rod 32 rotating and being clamped into the limiting groove 33 and the fixing block 28 indirectly being clamped into the clamping groove 29, a double interlock between the upper hook frame body 1 and the hook 3 is realized, further strengthening the connection between the upper hook frame body 1 and the hook 3. The design of the double interlock mechanism enables a more stable connection between the upper hook frame body 1 and the hook 3, improving the operating safety of the equipment. Even if one of the interlocking mechanisms 19 fails, the other interlocking mechanism 19 can still maintain the connection between the upper hook frame body 1 and the hook 3, reducing the risk of equipment failure.

[0036] Through all the above embodiments, the working principle of the present invention is specifically as follows: When it is necessary to adjust the position of the upper hook frame body 1, by rotating the rotating rod 14, the abutting block 15 on the rotating rod 14 moves synchronously with the linear movement of the rotating rod 14. At this time, the extrusion force of the first spring 18 gradually decreases, and the reset of the first spring 18 causes the abutting plate 17 to slide in the through groove 16 and gradually move away from the ratchet pawl 12. At this time, the operator holds the upper hook frame body 1 and the lifting hook 3 with both hands respectively, and then rotates the upper hook frame body 1 to make it rotate to an appropriate angle. Subsequently, the rotating rod 14 is screwed into the cylindrical groove 13 again, and the abutting block 15 presses the abutting plate 17 to cause the abutting plate 17 to limit and lock the ratchet pawl 12. Through the cooperation of the ratchet 9 fixedly arranged on the lifting hook 3 and the ratchet pawl 12 on one side, the upper hook frame body 1 can be rotated at any angle. This design allows the upper hook frame body 1 to flexibly adjust the angle when hanging a load, improving the operation convenience of the equipment. Through the interaction between the ratchet 9 and the ratchet pawl 12, the operator can easily rotate the upper hook frame body 1 to the required angle to meet different lifting requirements; When it is necessary to lock the upper hook frame body 1 and the lifting hook 3, the second cushion block 22 is sleeved on the lifting hook 3, and its position is inside the upper hook frame body 1. Then the limiting block 23 is rotated to make it fit with the second cushion block 22, and then the fixing bolt 21 is inserted into the through hole 20 under the lifting hook 3. Under the action of gravity, the fixing bolt 21 is stuck into the arc-shaped groove 24 of the limiting block 23, realizing the preliminary fixation of the upper hook frame body 1 and the lifting hook 3. Finally, the fixing rod 32 is rotated to make it rotate and be stuck into the limiting groove 33, realizing secondary fixation. The fixing bolt 21 is stuck into the arc-shaped groove 24 of the limiting block 23 under the action of gravity, realizing the preliminary fixation of the upper hook frame body 1 and the lifting hook 3. This design utilizes the action of gravity, making the fixing bolt 21 firmly stuck in the arc-shaped groove 24 and not easy to loosen. Rotating the fixing rod 32 to make it rotate and be stuck into the limiting groove 33 realizes secondary fixation. This double locking mechanism further enhances the connection stability between the upper hook frame body 1 and the lifting hook 3.

[0037] When the fixing bolt 21 breaks due to large stress, at this time the upper hook frame body 1 will instantaneously drop. During the dropping process, the fixing block 28 gradually approaches the clamping groove 29. When the width of the clamping groove 29 covers the fixing block 28, the pressure of the second spring 27 is released, and at the same time the fixing block 28 pops out. Several fixing blocks 28 perform emergency fixation between the lifting hook 3 and the upper hook frame body 1, avoiding the complete failure of the equipment caused by the breakage of the fixing bolt 21, and improving the maintainability and practicality of the equipment. It provides additional safety guarantee for the equipment. Even if the fixing bolt 21 fails, the equipment can still maintain a certain stability.

[0038] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary. Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0039] The present invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An upper hook frame assembly of an electric chain hoist, comprising: An upper hook frame body (1), wherein a through hole (2) is formed through the upper hook frame body (1), and a hook (3) is inserted into the through hole (2), and the upper hook frame body (1) is characterized in that it further comprises: A rotating mechanism (7), the rotating mechanism (7) being arranged on the upper hook frame body (1) and the hook (3), the rotating mechanism (7) comprising a ratchet (9) fixedly arranged on the hook (3), a ratchet pawl (12) being arranged on one side of the ratchet (9), and the rotating mechanism (7) being used for rotating the upper hook frame body (1) at any angle; An interlocking mechanism (19) is arranged on the upper hook frame body (1) and the hook (3), the interlocking mechanism (19) comprises a limit block (23) arranged at the bottom of the hook (3), an annular block (25) is fixedly arranged on the limit block (23), a plurality of grooves (26) are equidistantly formed on the annular block (25), and a fixed block (28) is slidably arranged on the inner walls of the plurality of grooves (26), the interlocking mechanism (19) is used to prevent the upper hook frame body (1) from falling off or loosening.

2. The upper hook frame assembly of the electric chain hoist according to claim 1, characterized in that: The hook (3) is provided with a latch (4) penetrating therethrough, and a torsion spring (5) is symmetrically provided on the latch (4). A tongue (6) is rotatably provided between the torsion springs (5) via the latch (4), and an end of the tongue (6) is clamped at the tip of the hook (3).

3. The upper hook frame assembly of the electric chain hoist according to claim 2, characterized in that: The rotating mechanism (7) further comprises a cushion block 1 (8) arranged on the upper hook frame body (1); the cushion block 1 (8) is fixedly connected to the upper hook frame body (1) via bolts.

4. The upper hook frame assembly of the electric chain hoist according to claim 3, characterized in that: A connecting shaft (10) is fixedly arranged on the cushion block 1 (8), a torsion spring 2 (11) is sleeved on the connecting shaft (10), a ratchet pawl (12) is rotatably connected to the torsion spring 2 (11) via the connecting shaft (10), and an end of the ratchet pawl (12) is clamped on the teeth of the ratchet wheel (9).

5. The upper hook frame assembly of the electric chain hoist according to claim 4, characterized in that: The cushion block 1 (8) is provided with a cylindrical groove (13), the cylindrical groove (13) is internally threadedly connected to a rotating rod (14), and a stop block (15) is fixedly provided in the middle of the rotating rod (14).

6. The upper hook frame assembly of the electric chain hoist according to claim 5, characterized in that: The cushion block 1 (8) is also provided with a through groove (16), the through groove (16) being in communication with the cylindrical groove (13), a stop plate (17) being slidably arranged on the inner wall of the through groove (16), the middle of the stop plate (17) being penetrated by the rotating rod (14), and a spring 1 (18) being sleeved on the rotating rod (14) on the side of the stop plate (17) away from the stop block (15).

7. The upper hook frame assembly of the electric chain hoist according to claim 1, characterized in that: The interlocking mechanism (19) further comprises a through hole (20) extending through the bottom of the hook (3), a fixing bolt (21) being inserted through the through hole (20), a cushion block (22) being sleeved on the hook (3), a limit block (23) being arranged below the cushion block (22), a plurality of arc grooves (24) being equidistantly arranged on the limit block (23), the size of the arc grooves (24) being adapted to the diameter of the fixing bolt (21).

8. The upper hook frame assembly of the electric chain hoist according to claim 7, characterized in that: An annular block (25) is fixedly sleeved on the outer surface of the limiting block (23), and a second spring (27) is fixedly arranged in a plurality of grooves (26) on the outer surface of the annular block (25), and the second spring (27) is fixedly connected to the end of the fixed block (28).

9. The upper hook frame assembly of the electric chain hoist according to claim 8, characterized in that: One end of the fixing block (28) away from the bottom of the groove (26) is arranged in an arc shape and fits with the upper hook frame body (1); a clamping groove (29) is provided on the upper hook frame body (1); the clamping groove (29) is arranged in an annular shape; the width of the clamping groove (29) is greater than the diameter of the fixing block (28).

10. The upper hook frame assembly of the electric chain hoist according to claim 9, characterized in that: The bottom of the hook (3) is also provided with a mounting groove (30), a rotating block (31) is rotatably connected in the mounting groove (30), a fixing rod (32) is fixedly provided at the bottom of the rotating block (31), and a limiting groove (33) is also provided on the upper hook frame body (1), the width of the limiting groove (33) is adapted to the diameter of the fixing rod (32), and both ends of the fixing rod (32) are located in the limiting groove (33).

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