Improved electric hoist load limiting device
By incorporating an adjustment component into the load limiting device of the electric hoist, the problem of complex adjustment of the load limiting component is solved, the accuracy and repeatability of the load limit value are achieved, and the stability and safety of the equipment are improved.
Patent Information
- Application Number
- CN202423252111.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing load limiting devices suffer from dust and heat generation, leading to unstable equipment operation. Furthermore, adjustments require restarting the machine, which involves complex internal operations and affects the accuracy of the load limiting components and the stability of the equipment.
An improved load limiting device for electric hoists was designed. By setting adjustment components inside the input shaft, including a top shaft, a spring seat, a spring, a retaining ring, an adjustment shaft, and a fixing sleeve, the friction force of the load limiting components can be adjusted to ensure the accuracy and repeatability of the load limit value.
It improves the stability and safety of equipment operation, extends the service life of the equipment, simplifies the adjustment process of load-limiting components, and improves the accuracy and consistency of adjustment.
Smart Images
Figure CN223688013U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to hoisting machinery technical field more specifically relates to an improved electric hoist load limiter. BACKGROUND
[0002] In the stage erection, factory, mine, port and wind turbine unit etc.
[0003] At present, electric hoist is widely used in industrial production, but the existing load limiter has many deficiencies. Utility model content
[0004] The utility model discloses to overcome the defects of the load limiter in the prior art, ensure that the electric hoist runs within the safe load range, improve the stability and safety of equipment operation and prolong the service life of equipment.
[0005] An improved electric hoist load limiter, comprising a reduction gearbox box body, the reduction gearbox box body is equipped with an input shaft, the improved electric hoist load limiter comprises a load limiting component outside the input shaft and an adjusting component arranged in the input shaft, the input shaft is hollow and penetrates, the adjusting component comprises a top shaft arranged in the inner cavity of the input shaft and gap matched, the input shaft, the load limiting component, the top shaft and the motor shaft are coaxial, the top shaft abuts against the load limiting component and adjusts the friction of the load limiting component.
[0006] As further improvement and supplement to the above scheme, the utility model still includes the following additional technical features:
[0007] The adjusting component further comprises a slidingly fitted compression spring seat arranged in the inner cavity of the input shaft, the top shaft abuts against the load limiting component, the compression spring seat and the top shaft end face are arranged along the same axis, a compression spring is sleeved on the compression spring seat, a stop ring for compression is arranged on the outer side of the compression spring, an adjusting shaft for adjustment and a fixing sleeve for limiting are arranged, and a snap spring and a nut are arranged on the outer side. The adjusting is convenient and fast, the structure is reasonable, the accuracy of the load limiting value setting and adjustment is high, and the consistency of the repeated adjustment of the load limiting value is good.
[0008] The load limiting component comprises a first friction plate seat and a second friction plate seat, and a friction plate is arranged in the middle.
[0009] One end of the adjusting shaft is provided with a hexagonal structure.
[0010] The utility model discloses the following beneficial effects can be achieved:
[0011] The utility model discloses the adjusting component is arranged in the input shaft, and the adjustment will not affect the bearing of the installation on the shaft, and will not cause the change of the axial force. BRIEF DESCRIPTION OF DRAWINGS
[0012] Fig. 1 It is the front view of the utility model.
[0013] Fig. 2 It is the bottom view of the utility model.
[0014] Fig. 3 It is the structure schematic view of adjusting shaft 2 in the utility model. DETAILED DESCRIPTION
[0015] The specific embodiment of the utility model is described in detail in combination with the drawings.
[0016] As Figs. 1-3 The utility model discloses an improved electric hoist load limiting device.
[0017] The improved electric hoist load limiting device comprises a reduction gearbox body 1, the reduction gearbox body 1 is provided with an input shaft 7, the input shaft 7 is a hollow through structure, the improved electric hoist load limiting device comprises a load limiting component outside the input shaft 7 and an adjusting component arranged in the input shaft 7, the load limiting component is connected with a motor, and power is input. The adjusting component comprises a top shaft 8 arranged in the inner cavity of the input shaft 7 and in clearance fit, the input shaft 7, the load limiting component, the top shaft 8 and the motor shaft are coaxial. The load limiting component is driven by the motor 3, the load limiting component drives the input shaft 7 to rotate, and then drives other transmission components in the reduction gearbox body 1. The top shaft 8 abuts against the load limiting component to adjust the friction force of the load limiting component.
[0018] Further, the adjusting component further comprises a compression spring seat 9 arranged in the inner cavity of the input shaft 7 in sliding fit, the top shaft 8 abuts against the load limiting component, and the compression spring seat 9 and the end face of the top shaft 8 are arranged on the same axis. The compression spring seat 9 is provided with a boss, a compression spring 14 is sleeved on the compression spring seat 9, a stop ring 10 for pressing on the outside of the compression spring 14, an adjusting shaft 2 for adjustment and a fixing sleeve 12 for limiting position, and a snap spring 13 and a nut 11 on the outside. The fixing sleeve 12 is fixed in the input shaft 7 by the snap spring 13 to limit the position of the compression spring 14 and the stop ring 10, and the fixing sleeve 12 is threadedly connected with the adjusting shaft 2, and the adjusting shaft 2 is fixed by the nut 11 on the outside of the snap spring 13.
[0019] Further, the load limiting component comprises a first friction plate seat 4 and a second friction plate seat 6, the first friction plate seat 4 and the second friction plate seat 6 are double-step structures, and a friction plate 5 is arranged in the middle. The first friction plate seat 4 is connected with the motor shaft of the motor 3, the second friction plate seat 6 is sleeved with the top shaft 8, the second friction plate seat 6 is attached to the step of one end of the input shaft 7, the last end of the input shaft 7 extends into the second friction plate seat 6, and a gap is arranged between the two.
[0020] The motor 3 drives the first friction plate seat 4, the first friction plate seat 4 drives the friction plate 5 and the second friction plate seat 6, and then drives the input shaft 7 to rotate.
[0021] Further, one end of the adjusting shaft 2 is provided with a hexagonal structure, and the other end of the adjusting shaft 2 is provided with an internal corner structure for adjusting the position of the adjusting shaft 2.
[0022] When the improved electric hoist load limiting device is used,
[0023] After the installation of the parts is completed, the adjusting shaft is adjusted, and the adjustment is locked by a nut. Only the position of the adjusting shaft is adjusted and the compression spring 14 is compressed, the second friction plate seat is compressed by the compression spring, the adjustment of the size of the friction force is carried out, the position of the adjusting shaft is more inward, the friction force is larger, that is, the lifting force is larger, and the lifting multiple is larger. According to the requirement, the multiple of the load limiting is adjusted, such as 1.5 times, if the value exceeds this value, the friction plate 5 and the second friction plate seat 6 slip, the input shaft 7 does not rotate, and power transmission is not performed, at this time, the load cannot be lifted, and the load limiting is realized. Because the position of the adjusting shaft after the adjustment is fixed and does not change, the top shaft is uniformly in contact with the second friction plate seat, the axial normal force is uniformly distributed, and therefore the load limiting stability of the limiting device is high, the accuracy of the load limiting value setting and adjustment is high, and the consistency of the repeated adjustment of the load limiting value is good.
[0024] The above is the preferred embodiment of the utility model, and does not limit the protection scope of the utility model. The deformation and improvement made by the person skilled in the art according to the design idea of the utility model should be regarded as being within the protection scope of the utility model.
Claims
1. An improved load limiting device for an electric hoist, comprising a reduction gearbox housing (1) provided with an input shaft (7), characterized in that: The improved electric hoist load limiting device comprises a load limiting component outside an input shaft (7) and an adjusting component arranged inside the input shaft (7), the load limiting component is connected with a motor (3) to input power; the input shaft (7) is a hollow through structure, the adjusting component comprises a top shaft (8) arranged in the inner cavity of the input shaft (7) and in clearance fit, the input shaft (7), the load limiting component, the top shaft (8) and the motor shaft are coaxial; the top shaft (8) abuts against the load limiting component to adjust the friction of the load limiting component.
2. The improved electric hoist load limiter device according to claim 1, characterized in that: The adjusting component further comprises a compression spring seat (9) arranged in the inner cavity of the input shaft (7) and in sliding fit, the top shaft (8) abuts against the load limiting component, the end face of the compression spring seat (9) and the top shaft (8) are arranged in the same axis; a compression spring (14) is sleeved on the compression spring seat (9), a stop ring (10) for pressing on the outside of the compression spring (14), an adjusting shaft (2) for adjusting and a fixing sleeve (12) for limiting, and a snap spring (13) and a nut (11) on the outside.
3. The improved electric hoist load limiter device as claimed in claim 1, wherein: The load limiting component comprises a first friction plate seat (4) and a second friction plate seat (6), and a friction plate (5) arranged in the middle.
4. The improved electric hoist load limiter device as claimed in claim 2, wherein: One end of the adjusting shaft (2) is provided with a hexagonal structure.