Double-limiting type electric hoist

Abstract

The utility model provides a double limit type electric hoist which comprises a chain guide frame and a lifting chain, an opening for one end of the lifting chain to penetrate through is formed in the lower end of the chain guide frame, a lifting hook is arranged at the end, penetrating through the opening, of the lifting chain, and a first limit device and a second limit device are arranged at the positions, close to the opening, of the chain guide frame. The first limiting device comprises a microswitch arranged in the chain guide frame, a trigger rod of the microswitch downwards extends out of the chain guide frame, the second limiting device comprises a proximity switch arranged in the chain guide frame and a detection body arranged on the lifting hook, and the detection body is arranged above the lifting hook. And the maximum distance of the detection body sensed by the proximity switch is greater than the maximum distance of the trigger rod extending out of the chain guide frame. The second limiting device adopts a non-contact proximity switch and a detection body, so that the lifting hook is difficult to contact with the chain guide frame, the internal structure of the electric hoist is difficult to impact, and the service life of the electric hoist is difficult to influence.

Description

Technical Field

[0001] This utility model relates to electric hoists, and more particularly to a double-limit electric hoist. Background Technology

[0002] Currently, Chinese patent CN117466191A discloses a double-limiting chain guide structure, including a chain guide frame. The chain guide frame has a first opening for one end of the chain to pass through, and a hook is provided at the end of the chain extending from the first opening.

[0003] A first limiting device and a second limiting device are provided on the chain guide frame near the first opening. Both the first and second limiting devices include a micro switch and a trigger element that cooperates with the lever arm of the micro switch. The trigger element slides through the chain guide frame, with one end extending out of the chain guide frame to form a trigger head. A buffer stop is provided on the chain near the hook, and the trigger heads of both the first and second limiting devices are located on the movement trajectory of the buffer stop.

[0004] When the buffer block contacts the trigger head of the first limiting device, the hook is in the first rising position. When the buffer block contacts the trigger head of the second limiting device, the hook is in the second rising position, which is higher than the first rising position.

[0005] However, in the above-mentioned dual-limit chain guide structure, both the first and second limit devices adopt a switch structure that needs to directly contact the buffer block. Thus, when the buffer block touches the first and / or second limit devices, the buffer block will impact the internal structure of the electric hoist through the first and / or second limit devices, affecting the service life of the electric hoist. Summary of the Invention

[0006] In view of this, the purpose of this utility model is to provide a double-limit electric hoist, which has the advantage that its service life is not easily affected by impact.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is: a double-limiting electric hoist, including a chain guide frame and a lifting chain movably disposed in the chain guide frame. The lower end of the chain guide frame has an opening for one end of the lifting chain to pass through. A hook is provided at the end of the lifting chain passing through the opening. A first limiting device and a second limiting device are provided near the opening on the chain guide frame. The first limiting device includes a micro switch disposed in the chain guide frame, and the trigger rod of the micro switch extends downward out of the chain guide frame. The second limiting device includes a proximity switch disposed in the chain guide frame and a detection body disposed on the hook. The detection body is disposed above the hook. The proximity switch can sense that the maximum distance of the detection body is greater than the maximum distance of the trigger rod extending out of the chain guide frame.

[0008] Through the above technical solution, when the second limit device is in normal working condition, if the hook moves to a point where the distance between the detector and the proximity switch is less than or equal to the maximum sensing distance, the proximity switch will control the electric hoist to close. The second limit device uses a non-contact proximity switch and detector, so that during the process of closing the electric hoist via the second limit device, the hook does not contact the chain guide frame. This reduces the impact on the internal structure of the electric hoist and minimizes its service life. When the second limit device malfunctions, if the hook moves to a point where it contacts the trigger rod of the micro switch, the micro switch will control the electric hoist to close. The micro switch is a contact-type mechanical switch with high structural stability and is less prone to failure, thus preventing the electric hoist from overshooting.

[0009] Preferably, the upper end of the hook is provided with a buffer spring, the buffer spring is sleeved on the outside of the lifting chain, the upper end of the buffer spring is provided with a buffer block, the center of the buffer block is provided with a through hole, the lifting chain passes through the through hole, and the detection body is provided on the buffer block.

[0010] Through the above technical solution, the buffer spring and buffer block can buffer the upward movement of the hook, which can not only prevent the hook from directly hitting the chain guide frame, but also reduce the impact on the electric hoist during the upward movement of the hook.

[0011] Preferably, the lower end of the buffer block is provided with a mounting groove, the mounting groove is connected to the through hole, and the upper end of the buffer spring is installed in the mounting groove.

[0012] With the above technical solution, the upper end of the buffer spring is installed in the mounting groove, which improves its stability.

[0013] Preferably, the buffer block is made of rubber.

[0014] With the above technical solution, the buffer block is made of rubber. In this way, when the buffer block touches the chain guide frame, the buffer block can reduce the impact on the chain guide frame through deformation.

[0015] Preferably, the upper end of the buffer block is provided with an assembly groove, and the detection body is installed in the assembly groove.

[0016] With the above technical solution, the testing device is installed in the assembly groove, making disassembly and assembly more convenient.

[0017] Preferably, the device also includes an electric hoist body, the lower end of which has an assembly groove, the chain guide frame is installed in the assembly groove, the electric hoist body has a switching chamber, the switching chamber is arranged side by side with the chain guide frame, the switching chamber has a limit block, the side wall of the limit block has a storage groove for the lifting chain to be placed, the side wall of the limit block has a limit pressure plate, the limit pressure plate covers the opening of the storage groove, and a limit bolt is provided through the limit pressure plate, the limit bolt is used to pass through the lifting chain and press the limit pressure plate tightly and fix it on the limit block.

[0018] With the above technical solution, when it is necessary to change the electric hoist from a single chain to a double chain, a hole communicating with the storage groove can be opened at the lower end of the electric hoist body, and the end of the lifting chain can be inserted into the storage groove. The end of the lifting chain is limited by the limit bolt, and the opening of the storage groove is covered by the limit pressure plate.

[0019] Preferably, a fixing block is provided in the switching chamber, and a fixing bolt is provided through the limiting pressure plate to press and fix the limiting pressure plate on the fixing block.

[0020] The above technical solution, with the cooperation of the fixing block and the fixing bolt, and the cooperation of the limiting block and the limiting bolt, can effectively improve the connection stability of the limiting pressure plate, thereby more effectively restricting the end of the lifting chain. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the structure of an embodiment. Figure 2 ;

[0023] Figure 3 This is a structural schematic diagram of a chain guide frame;

[0024] Figure 4 This is a cross-sectional schematic diagram of an embodiment;

[0025] Figure 5 for Figure 4 Enlarged view of part A;

[0026] Figure 6 This is a partial schematic diagram of an embodiment.

[0027] Reference numerals: 1. Chain guide frame; 2. Lifting chain; 3. Opening; 4. Hook; 5. First limit device; 51. Micro switch; 52. Trigger rod; 6. Second limit device; 61. Proximity switch; 62. Detector; 7. Buffer spring; 8. Buffer block; 9. Through hole; 10. Mounting groove; 11. Assembly groove; 12. Electric hoist body; 13. Assembly groove; 14. Switching chamber; 15. Limit block; 16. Storage groove; 17. Limiting pressure plate; 18. Limiting bolt; 19. Fixing block; 20. Fixing bolt. Implementation

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0029] A type of double-limit electric hoist, such as Figures 1 to 6 As shown, it includes a chain guide frame 1 and a lifting chain 2 movably installed in the chain guide frame 1. The lower end of the chain guide frame 1 has an opening 3 for one end of the lifting chain 2 to pass through, and the end of the lifting chain 2 that passes through the opening 3 is provided with a hook 4.

[0030] A first limiting device 5 and a second limiting device 6 are provided near the opening 3 of the chain guide frame 1. The first limiting device 5 includes a micro switch 51 disposed in the chain guide frame 1, and the trigger rod 52 of the micro switch 51 extends downward out of the chain guide frame 1. The second limiting device 6 includes a proximity switch 61 disposed in the chain guide frame 1 and a detection body 62 disposed on the hook 4. The detection body 62 is disposed above the hook 4, and the proximity switch 61 can sense that the maximum distance of the detection body 62 is greater than the maximum distance of the trigger rod 52 extending out of the chain guide frame 1.

[0031] A buffer spring 7 is provided at the upper end of the hook 4, and the buffer spring 7 is sleeved on the outside of the lifting chain 2. A buffer block 8 is provided at the upper end of the buffer spring 7, and a through hole 9 is opened at the center of the buffer block 8, through which the lifting chain 2 passes. A mounting groove 10 is opened at the lower end of the buffer block 8, which is connected to the through hole 9, and the upper end of the buffer spring 7 is installed in the mounting groove 10. The buffer block 8 is made of rubber. An assembly groove 11 is opened at the upper end of the buffer block 8, and the detection body 62 is installed in the assembly groove 11.

[0032] The system also includes an electric hoist body 12. An assembly groove 13 is provided at the lower end of the electric hoist body 12, and the chain guide frame 1 is installed in the assembly groove 13. A switching chamber 14 is provided in the electric hoist body 12, and the switching chamber 14 is arranged side-by-side with the chain guide frame 1. A limit block 15 is provided in the switching chamber 14, and a storage groove 16 for the lifting chain 2 is provided on the side wall of the limit block 15. A limit pressure plate 17 is provided on the side wall of the limit block 15, and the limit pressure plate 17 covers the opening of the storage groove 16. A limit bolt 18 is provided through the limit pressure plate 17, and the limit bolt 18 is used to pass through the lifting chain 2 and press and fix the limit pressure plate 17 onto the limit block 15. A fixing block 19 is provided in the switching chamber 14, and a fixing bolt 20 is provided through the limit pressure plate 17, and the fixing bolt 20 is used to press and fix the limit pressure plate 17 onto the fixing block 19.

[0033] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A double-limiting electric hoist, comprising a chain guide frame (1) and a lifting chain (2) movably disposed in the chain guide frame (1), wherein the lower end of the chain guide frame (1) has an opening (3) for one end of the lifting chain (2) to pass through, and the end of the lifting chain (2) passing through the opening (3) is provided with a hook (4), and the chain guide frame (1) is provided with a first limiting device (5) and a second limiting device (6) near the opening (3), characterized in that: The first limiting device (5) includes a micro switch (51) disposed in the chain guide frame (1), and the trigger rod (52) of the micro switch (51) extends downward out of the chain guide frame (1). The second limiting device (6) includes a proximity switch (61) disposed in the chain guide frame (1) and a detection body (62) disposed on the hook (4). The detection body (62) is disposed above the hook (4). The proximity switch (61) can sense that the maximum distance of the detection body (62) is greater than the maximum distance of the trigger rod (52) extending out of the chain guide frame (1).

2. A double-limiting electric hoist according to claim 1, characterized in that: The upper end of the hook (4) is provided with a buffer spring (7), which is sleeved on the outside of the lifting chain (2). The upper end of the buffer spring (7) is provided with a buffer block (8), and a through hole (9) is provided at the center of the buffer block (8). The lifting chain (2) passes through the through hole (9), and the detection body (62) is provided on the buffer block (8).

3. The double-limiting electric hoist according to claim 2, characterized in that: The lower end of the buffer block (8) is provided with a mounting groove (10), which is connected to the through hole (9), and the upper end of the buffer spring (7) is installed in the mounting groove (10).

4. The double-limiting electric hoist according to claim 2, characterized in that: The buffer block (8) is made of rubber.

5. A double-limiting electric hoist according to claim 3, characterized in that: The upper end of the buffer block (8) is provided with an assembly groove (11), and the detection body (62) is installed in the assembly groove (11).

6. The double-limiting electric hoist according to claim 1, characterized in that: It also includes an electric hoist body (12), the lower end of which is provided with an assembly groove (13), the chain guide frame (1) is installed in the assembly groove (13), the electric hoist body (12) is provided with a switching chamber (14), the switching chamber (14) is arranged side by side with the chain guide frame (1), the switching chamber (14) is provided with a limit block (15), and the side wall of the limit block (15) is provided with a limit block (15). A storage groove (16) for the lifting chain (2) is provided. A limiting plate (17) is provided on the side wall of the limiting block (15). The limiting plate (17) covers the opening of the storage groove (16). A limiting bolt (18) is provided through the limiting plate (17). The limiting bolt (18) is used to pass through the lifting chain (2) and press the limiting plate (17) tightly and fix it on the limiting block (15).

7. A double-limitted electric hoist according to claim 6, characterized in that: A fixing block (19) is provided in the switching chamber (14), and a fixing bolt (20) is provided through the limiting pressure plate (17). The fixing bolt (20) is used to press and fix the limiting pressure plate (17) on the fixing block (19).

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