Load limiting structure of electric hoist
By designing a load-limiting structure in the electric hoist and utilizing upper and lower limit devices, the potential safety hazard when the hook is in the extreme position is resolved, thereby improving safety and reducing costs.
Patent Information
- Application Number
- CN202422752064.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-11-12
AI Technical Summary
Traditional electric hoists pose safety risks when the hook is at the bottom or top, and are expensive, especially in emergencies such as power outages, which may cause accidents.
A load-limiting structure for an electric hoist is designed, including an upper limit device and a lower limit device. The transmission shaft cooperates with the sprocket to ensure that the hook automatically idles at the highest point and the lowest point to prevent further lifting or lowering. The limit function is achieved by using components such as brake bolts, self-locking nuts and disc springs.
It effectively prevents the hook from continuing to operate when it is in the extreme position, improves safety, reduces the risk of accidents, and reduces equipment costs to a certain extent.
Smart Images
Figure CN223316318U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of hoisting equipment, and in particular to a load-limiting structure of an electric hoist. Background Art
[0002] As a light and small lifting equipment, hoist is widely used in industrial and construction fields due to its small size and simple structure.
[0003] Hoists are divided into manual hoists and electric hoists. Although traditional manual hoists have a simple structure and do not require electricity, operators need to expend a lot of physical strength when handling heavy objects, and the lifting speed is slow. Although electric hoists improve efficiency and save manpower, there are some safety hazards in emergencies such as power outages, and the cost of electric hoists is often higher.
[0004] There is also a type of electric hoist that is driven by a hand drill. The hand drill is inserted into a preset hole and rotated to drive the hoist, which solves the above-mentioned problem to a certain extent. However, there are still safety hazards. When the user continues to use the hand drill to drive when the hook is at the bottom or top, it is very easy to cause the lifting chain to break, and then cause an accident. Therefore, how to solve the above-mentioned problem is the purpose of this application.
[0005] The above content is only used to assist in understanding the technical solution of this application, and does not mean that the above content is the closest prior art to this application. Summary of the Invention
[0006] Based on this, the present application provides a load limiting structure for an electric hoist to solve one of the above technical problems.
[0007] The technical solution adopted by the present application to solve its technical problem is a load-limiting structure of an electric hoist, comprising: a shell, including a limiting shell, and the limiting shell is arranged on one side of the shell; a long shaft, horizontally arranged in the shell; a sprocket, arranged on the long shaft, with a chain arranged on it, and a hook is installed on one end of the chain; an upper limit device, arranged in the shell and connected to one end of the long shaft, the upper limit device is used to make the upper limit device enter idle rotation when the hook is at the top; a transmission shaft, arranged in the shell, with a transmission gear on the transmission shaft, and the transmission gear cooperates with the upper limit device; a lower limit device is arranged in the limiting shell and connected to one end of the transmission shaft, and the lower limit device is used to lock the lower limit device when the hook is at the bottom.
[0008] In some embodiments, the upper limit device includes a first brake bolt, a first self-locking nut, a brake gear, a self-lubricating steel sleeve, a first disc spring, a first pressure plate, and a first friction plate. The inner wall of the brake gear is provided with a self-lubricating steel sleeve, and friction plates are provided at both ends of the brake gear. The brake gear, the first pressure plate, and the first disc spring are sequentially sleeved on the brake bolt. The first self-locking nut is screwed on the front end of the first brake bolt and abuts against one end of the first disc spring.
[0009] In some embodiments, the lower limit device includes a second brake bolt, a second self-locking nut, a second disc spring, a brake nut, a needle roller, a second friction plate, a second pressure plate, and a drive shaft. Friction plates are provided on both sides of the drive shaft. A center hole is provided in the center of the brake nut, and three arc grooves for accommodating the needle roller are provided on the edge of the center hole. The brake nut, the drive shaft, the second disc spring, and the second self-locking nut are sequentially sleeved on the second brake bolt.
[0010] In some embodiments, a driving hole is provided on the limiting housing.
[0011] In some embodiments, a keyway is provided in the middle section of the first brake bolt, and a latching protrusion that cooperates with the keyway is provided on the inner wall of the first pressing plate.
[0012] In some embodiments, the front end of the second brake bolt is a second threaded section and cooperates with the second self-locking nut.
[0013] In some embodiments, a bearing is provided in the limiting housing, and the bearing cooperates with the upper limiting device.
[0014] The beneficial effect of the present application is that by installing an upper limit device and a lower limit device, the upper limit device can make the upper limit device enter idle rotation when the hook is at the highest point, and the lower limit device stops entering idle rotation when the hook is at the lowest point and the limit column abuts against the outer shell. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of this application.
[0017] Figure 2 It is an exploded schematic diagram of the internal installation structure of this application.
[0018] Figure 3 It is an exploded schematic diagram of the upper limit device of the present application.
[0019] Figure 4 It is an exploded schematic diagram of the lower limit device of the present application.
[0020] Explanation of the accompanying numbers: 1. Shell; 11. Limiting shell; 12. Drive hole; 2. Long shaft; 3. Sprocket; 31. Chain; 311. Hook; 312. Limiting column; 4. Upper limiting device; 41. First brake bolt; 411. Keyway; 42. First self-locking nut; 43. Braking gear; 44. Self-lubricating steel sleeve; 45. First disc spring; 46. First pressure plate; 461. Boss; 47. First friction plate; 5. Lower limiting device; 51. Second brake bolt; 52. Second self-locking nut; 53. Second disc spring; 54. Braking nut; 541. Center hole; 542. Arc groove; 55. Needle roller; 56. Second friction plate; 57. Second pressure plate; 58. Drive shaft; 6. Transmission shaft; 61. Transmission gear; 7. Bearing. DETAILED DESCRIPTION
[0021] 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 a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection of this application.
[0022] In the examples of this application, please refer to Figure 1-4 As shown, the present application provides a load limiting structure of an electric hoist, which mainly includes: a shell 1, including a limiting shell 11, and the limiting shell 11 is arranged on one side of the shell 1; a long shaft 2, horizontally arranged in the shell 1; a sprocket 3, arranged on the long shaft 2, on which a chain 31 is arranged, and a hook 311 is installed on one end of the chain 31; an upper limit device 4, arranged inside the shell 1 and connected to one end of the long shaft 2, and the upper limit device 4 is used to make the upper limit device 4 enter idle rotation when the hook 311 is at the top; a transmission shaft 6, arranged inside the shell 1, and a transmission gear 61 is provided on the transmission shaft 6, and the transmission gear 61 cooperates with the upper limit device 4; a lower limit device 5, arranged in the limiting shell 11 and connected to one end of the transmission shaft 6, and the lower limit device 5 is used to lock the lower limit device 5 when the hook 311 is at the bottom.
[0023] As an illustration, the lower limit device 5 is driven from the limit housing 11 by a hand electric drill, the upper limit device 4 is connected to the lower limit device 5 by the transmission shaft 6, and the upper limit device 4 is connected to the sprocket 3.
[0024] When the hook 311 continues to move upward, the lower limit device 5 rotates counterclockwise and the upper limit device 4 rotates clockwise. When the hook 311 rises to the top, the hook 311 cannot continue to rise, and the upper limit device 4 enters idling, preventing the sprocket 3 from continuing to rotate until it stops rotating.
[0025] When the hook 311 continues to move downward, the lower limit device 5 rotates clockwise and the upper limit device 4 rotates counterclockwise. When the hook 311 drops to the lowest point and the limit column 312 is engaged with the bottom of the shell 1, the hook 311 cannot continue to drop, and the lower limit device 5 enters idling.
[0026] Some preferred / improved embodiments based on the above embodiments will be described below. Any one of the following embodiments may be selected, or multiple embodiments may be selected and combined.
[0027] Reference Figure 3 As shown, the upper limit device 4 includes a first brake bolt 41, a first self-locking nut 42, a brake gear 43, a self-lubricating steel sleeve 44, a first disc spring 45, a first pressure plate 46, and a first friction plate 47. The inner wall of the brake gear 43 is provided with a self-lubricating steel sleeve 44, and friction plates are provided at both ends of the brake gear 43. The brake gear 43, the first pressure plate 46, and the first disc spring 45 are sequentially sleeved on the brake bolt. The first self-locking nut 42 is screwed on the front end of the first brake bolt 41 and abuts against one end of the first disc spring 45. In this way, when the hook 311 rises to the highest point and is still in rotation, the disc spring will be compressed under a larger force, so that this side keeps rotating, and the other side is only subjected to partial force and enters idling, preventing the hook 311 from continuing to rise.
[0028] Reference Figure 4As shown, the lower limit device 5 includes a second braking bolt 51, a second self-locking nut 52, a second disc spring 53, a braking nut 54, a needle roller 55, a second friction plate 56, a second pressure plate 57, and a drive shaft 58. Friction plates are arranged on both sides of the drive shaft 58. A center hole 541 is opened in the center of the braking nut 54, and three arc grooves 542 for accommodating the needle roller 55 are arranged on the edge of the center hole 541. The braking nut 54, the drive shaft 58, the second disc spring 53, and the second self-locking nut 52 are sequentially sleeved on the second braking bolt 51. In this way, when the lower limit device 5 rotates clockwise, the needle roller 55 will rotate together along the inner wall of the arc groove 542. When the limiting column 312 abuts against the bottom of the shell 1, the sprocket 3 cannot continue to rotate, causing the lower limit device 5 to slip and enter idling.
[0029] Specifically, a driving hole 12 is provided on the limiting housing 11 , so that the hand drill drives the lower limiting device 5 through the driving hole 12 .
[0030] Specifically, a keyway 411 is provided in the middle section of the first brake bolt 41, and a latching protrusion 461 that cooperates with the keyway 411 is provided on the inner wall of the first pressing plate 46. This arrangement allows the pressing plate to only slide up and down along the outer circumference of the brake bolt and will not be driven to rotate by the brake gear 43.
[0031] Specifically, in order to prevent the upper limit device 4 from wearing out the limit housing 11 when rotating, a bearing 7 is provided in the limit housing 11 , and the bearing 7 cooperates with the upper limit device 4 .
[0032] Thus far, various embodiments of the present application have been described in detail. To avoid obscuring the concept of the present application, some details well known in the art have not been described. Based on the above description, those skilled in the art will fully understand how to implement the technical solutions disclosed herein.
[0033] Finally, it should be noted that the above is only a preferred embodiment of the present application, and the aforementioned embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the various embodiments of the present application.
Claims
1. The load limiting structure of the electric hoist is characterized by: include: The housing comprises a limiting shell, wherein the limiting shell is arranged on one side of the housing; a long axis, horizontally disposed in the housing; A sprocket is arranged on the long shaft, and a chain is arranged on the sprocket. A hook is installed on one end of the chain, and a limit column is arranged on the other end; An upper limit device is arranged inside the housing and connected to one end of the long shaft, and is used to make the upper limit device enter idle rotation when the hook is at the top; A transmission shaft is arranged inside the housing, and a transmission gear is provided on the transmission shaft, and the transmission gear cooperates with the upper limit device; A lower limit device is provided in the limit housing and connected to one end of the transmission shaft. The lower limit device is used to lock the lower limit device when the hook is at the bottom.
2. The load limiting structure of the electric hoist according to claim 1, characterized in that: The upper limit device includes a first brake bolt, a first self-locking nut, a brake gear, a self-lubricating steel sleeve, a first disc spring, a first pressure plate, and a first friction plate. The inner wall of the brake gear is provided with a self-lubricating steel sleeve, and friction plates are provided at both ends of the brake gear. The brake gear, the first pressure plate, and the first disc spring are sequentially sleeved on the brake bolt. The first self-locking nut is screwed on the front end of the first brake bolt and abuts against one end of the first disc spring.
3. The load limiting structure of the electric hoist according to claim 1, characterized in that: The lower limit device includes a second braking bolt, a second self-locking nut, a second disc spring, a braking nut, a needle roller, a second friction plate, a second pressure plate, and a drive shaft. Friction plates are provided on both sides of the drive shaft. A center hole is provided in the center of the braking nut, and three arc grooves for accommodating the needle roller are provided on the edge of the center hole. The braking nut, the drive shaft, the second disc spring, and the second self-locking nut are sequentially sleeved on the second braking bolt.
4. The load limiting structure of the electric hoist according to claim 1, characterized in that: A driving hole is provided on the limiting shell.
5. The load limiting structure of the electric hoist according to claim 2, characterized in that: A keyway is provided in the middle section of the first brake bolt, and a latching protrusion that cooperates with the keyway is provided on the inner wall of the first pressing plate.
6. The load limiting structure of the electric hoist according to claim 1, characterized in that: A bearing is provided in the limiting housing, and the bearing cooperates with the upper limiting device.