A shearing device for shearing a sheave shaft in the event of an overload

Abstract

The utility model discloses a pulley axle overload shearing device belongs to mechanical drive protection device technical field, and the device includes linkage shaft, driving assembly, driven assembly and pulley body, and driving assembly includes driving disc, and driven assembly includes driven disc, and driving disc and driven disc are oppositely arranged on linkage shaft, and pulley body is fixedly connected in driven disc, and the tooth groove is seted up on driving disc, and the spring and steel ball are accommodated in tooth groove, and the spring is abutted between tooth groove groove bottom and steel ball, and the recess that is compatible with steel ball is seted up on driven disc, and steel ball is clamped with recess under the action of spring, and driving assembly and driven assembly realize detachable through the thread connection of thread sleeve and nut, and the air hole is still equipped on thread sleeve. The utility model solves the problem that the overload protection device needs to stop and replace parts, and cannot reset automatically in the prior art through the cooperation of spring and steel ball and recess, and has the advantages of detachable structure, convenient maintenance, good heat dissipation and reliable operation.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical transmission protection devices, and in particular to an overload shearing device for a pulley shaft. Background Technology

[0002] In mechanical equipment, especially systems involving pulley drives, a sudden increase in load or unexpected jamming can cause the transmission system to experience impact torque far exceeding its design capacity; this situation is known as overload. To protect core components such as motors, reducers, and pulley bodies from permanent damage caused by overload, it is essential to install overload protection devices in the transmission chain.

[0003] Currently, a common overload protection method is the use of a shear pin structure. This structure connects the driving and driven parts through a relatively weak shear pin. When the transmitted torque exceeds a predetermined value, the shear pin physically shears off, thus cutting off power transmission. However, this protection method has inherent shortcomings. Once the shear pin is damaged, power transmission is completely interrupted, and the equipment must be shut down. Subsequent resumption of production requires maintenance personnel to manually replace the damaged shear pin. This process is not only time-consuming and labor-intensive but also directly leads to prolonged equipment downtime and reduced production efficiency, making it particularly unsuitable for automated production lines that require highly continuous operation.

[0004] Therefore, this utility model proposes a pulley shaft overload shearing device to overcome the shortcomings of the prior art. Utility Model Content

[0005] In view of the problems of existing pulley shaft overload protection devices, such as the need to stop the machine and manually replace damaged parts after overload, the inability to automatically resume operation, and the impact on production efficiency, this utility model aims to provide a pulley shaft overload shearing device with an improved structure that can effectively solve the above problems.

[0006] This utility model provides an overload shearing device for a pulley shaft, comprising: a linkage shaft, a driving component, a driven component, and a pulley body. The driving component includes a driving disc, and the driven component includes a driven disc. The driving disc is sleeved on the linkage shaft and rotates synchronously with it. The driven disc is rotatably sleeved on the linkage shaft, and the pulley body is fixedly connected to the driven disc.

[0007] The core structure of this device is that the driving disc has toothed grooves, while the driven disc has grooves on its opposite end face.

[0008] Furthermore, the tooth groove of the driving disc contains a steel ball and a spring. The spring abuts against the bottom of the tooth groove and between the steel ball. Under the elastic force of the spring, the steel ball and the groove of the driven disc form a detachable snap-fit ​​engagement. Through this structural combination, reliable torque transmission is achieved under normal load, and power is cut off instantly when the steel ball disengages from the groove under overload conditions.

[0009] Preferably, the driving component further includes a threaded sleeve, and the driven component further includes a nut. The threaded sleeve is coaxially fixed with the driving disc, the nut is coaxially disposed inside the driven disc, and the threaded sleeve and the nut are threadedly connected.

[0010] Preferably, a vent hole is provided on the outer peripheral wall of the threaded sleeve, which connects the outside of the threaded sleeve with the internal space of the drive disc.

[0011] Preferably, the pulley body is located on the side of the driven disc away from the driving disc.

[0012] Preferably, the driving disc has multiple sets of toothed grooves evenly distributed along its circumference, while the driven disc has multiple sets of grooves that correspond one-to-one with the multiple sets of toothed grooves.

[0013] Preferably, the drive disc and the linkage shaft are connected by a key to achieve synchronous rotation.

[0014] Preferably, the spring is a compression spring.

[0015] Preferably, the pulley shaft overload shearing device further includes a motor, and the output shaft of the motor is fixedly connected to the linkage shaft.

[0016] This utility model has the following beneficial effects: 1. In this utility model, by setting a detachable transmission structure formed by springs and steel balls between the tooth groove and the groove, the problem of existing pulley transmission devices being easily damaged and unable to automatically recover under overload is solved. It achieves the technical effect of instantly cutting off power under overload and automatically resetting after the overload is eliminated, effectively protecting the equipment and improving production continuity.

[0017] 2. In this utility model, by setting a threaded detachable connection between the active component and the driven component, the problem of inconvenient replacement of core vulnerable parts and low maintenance efficiency in similar devices is solved. This achieves the technical effect of convenient disassembly and assembly and quick maintenance, reduces the cost of use and extends the service life of the device. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a pulley shaft overload shearing device proposed in this utility model; Figure 2 This is a schematic diagram of the groove portion of a pulley shaft overload shearing device proposed in this utility model; Figure 3 This is a schematic diagram of the threaded sleeve portion of a pulley shaft overload shearing device proposed in this utility model; Figure 4 This is a schematic diagram of the toothed groove portion of a pulley shaft overload shearing device proposed in this utility model; Figure 5 for Figure 4 Enlarged view of point A in the image.

[0019] Legend: 1. Linkage shaft; 2. Pulley body; 3. Driving assembly; 301. Driving disc; 302. Gear groove; 303. Threaded sleeve; 304. Vent hole; 305. Steel ball; 306. Spring; 4. Motor; 5. Driven assembly; 501. Driven disc; 502. Groove; 503. Nut. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] Please refer to Figures 1 to 5 This utility model provides an overload shearing device for a pulley shaft, which aims to solve the problems of slow response of overload protection structure, inability to automatically reset after overload, and inconvenience of maintenance of key components in existing pulley transmission systems.

[0022] like Figure 1 As shown, the pulley shaft overload shearing device includes a linkage shaft 1, a driving component 3, a driven component 5, a pulley body 2, and a motor 4 for the drive device. The output shaft of the motor 4 is fixedly connected to the linkage shaft 1, providing a power source for the entire device. The driving component 3 is sleeved on the linkage shaft 1 and rotates synchronously with it, while the driven component 5 is rotatably sleeved on the linkage shaft 1. The pulley body 2 is fixedly connected to the driven component 5, thus forming a power transmission path from the motor 4 to the pulley body 2.

[0023] Please refer to Figures 2 to 5The core protection structure of this solution consists of a precisely fitted active component 3 and a driven component 5. The active component 3 includes an active disk 301, and the driven component 5 includes a driven disk 501. The end faces of the active disk 301 and the driven disk 501 are positioned opposite each other. The active disk 301 is fixedly circumferentially connected to the linkage shaft 1 via a key connection, thereby rotating synchronously with the linkage shaft 1. The active disk 301 has a toothed groove 302, which is a recessed cavity formed along the axial direction of the linkage shaft 1. The toothed groove 302 houses a steel ball 305 and a spring 306, which serves as a compression spring 306. One end of the spring 306 abuts against the bottom of the groove 302, and the other end abuts against the steel ball 305, applying a continuous axial thrust towards the driven disk 501 to the steel ball 305.

[0024] Corresponding to the driving disc 301, the driven disc 501 has a groove 502 on its end face facing the driving disc 301 that matches the steel ball 305. Under normal working load, the steel ball 305, under the thrust of the spring 306, partially engages in the groove 502, forming a rigid connection for torque transmission between the driving disc 301 and the driven disc 501. To enhance torque transmission capability and stability, the driving disc 301 has multiple sets of toothed grooves 302 evenly distributed along its circumference. The driven disc 501 also has multiple sets of grooves 502 corresponding to the toothed grooves 302. The steel ball 305 in each set of toothed grooves 302 works in conjunction with the corresponding groove 502.

[0025] The pulley body 2 is coaxially and fixedly connected to the driven plate 501, and is located on the side of the driven plate 501 away from the driving plate 301. When the driving plate 301 and the driven plate 501 are reliably connected, the power is transmitted from the linkage shaft 1 through the driving plate 301, the steel ball 305, and the driven plate 501 to the pulley body 2, driving it to operate normally.

[0026] To facilitate device maintenance and improve heat dissipation performance, the technical solution of this embodiment also includes a specific detachable structure and heat dissipation structure formed between the active component 3 and the driven component 5.

[0027] Please refer to the following carefully. Figures 2 to 5 The core structure will be described in detail below: The active component 3 also includes a threaded sleeve 303, and the driven component 5 also includes a nut 503. The threaded sleeve 303 is a hollow structure and is coaxially fixed to the side of the active disk 301 facing the driven disk 501. The nut 503 is coaxially disposed inside the driven disk 501. The threaded sleeve 303 and the nut 503 are detachably connected by threads. This threaded connection structure allows the threaded sleeve 303 to be screwed out or screwed into the nut 503 by rotating the active disk 301, thereby realizing the axial separation or combination of the active component 3 and the driven component 5. This design allows the steel ball 305 and the spring 306 located in the tooth groove 302 to be fully exposed, which greatly facilitates the inspection and replacement of these easily worn parts.

[0028] Meanwhile, to cope with the heat that may be generated when the motor 4 drives the linkage shaft 1 to operate and when it slips due to overload, a vent hole 304 is provided on the outer peripheral wall of the threaded sleeve 303. The vent hole 304 connects the outside of the threaded sleeve 303 with the internal space of the drive disc 301, creating an air circulation path between the inside and outside environment of the device. This can effectively dissipate internal heat and prevent heat accumulation from affecting the mechanical performance of the spring 306 or causing lubrication failure, thereby ensuring the long-term stable operation of the device.

[0029] Based on the above embodiments, the present invention may further include the following preferred technical solutions: In a preferred embodiment, in order to enhance the torque that the device can transmit and improve the smoothness of operation, multiple sets of toothed grooves 302 are evenly distributed on the driving disk 301 along its circumference, and multiple sets of grooves 502 corresponding to the multiple sets of toothed grooves 302 are opened on the driven disk 501. Each set of toothed grooves 302, steel ball 305, spring 306 and groove 502 together constitute a torque transmission and shearing unit. Multiple units work together to make the load evenly distributed. As a preferred power input scheme, the device also includes a motor 4, the output shaft of the motor 4 is fixedly connected to the first end of the linkage shaft 1 to drive the linkage shaft 1 to rotate, and the drive disk 301 and the linkage shaft 1 are preferably connected by a key to achieve synchronous rotation. This connection method has a simple structure and can reliably transmit the torque output by the motor 4. In a specific implementation, the spring 306 is preferably a compression spring 306, which uses the stable axial elastic force generated after being compressed to press the steel ball 305. The magnitude of the elastic force can be set by selecting springs 306 with different stiffnesses, thereby accurately controlling the overload protection threshold of the device. Furthermore, the pulley body 2 is preferably located on the side of the driven disc 501 away from the driving disc 301. This arrangement makes the power input part and the power output part clearly separated in the axial direction, and the structure is compact and conforms to the transmission logic.

[0030] Working principle: During normal operation, the motor 4 drives the linkage shaft 1 to rotate. Since the active disk 301 rotates synchronously with the linkage shaft 1, the active disk 301 rotates accordingly. At this time, the spring 306 in the tooth groove 302 of the active disk 301 applies an axial thrust to the steel ball 305, so that the steel ball 305 is stably stuck in the groove 502 of the driven disk 501. This stuck state makes the active disk 301 and the driven disk 501 form a rigid connection that rotates as a whole. The power is smoothly transmitted from the driven disk 501 to the pulley body 2 fixed to it. When the pulley 2 encounters excessive load or jams, the transmitted torque will increase sharply. Once the tangential force generated by this torque exceeds the preset axial pressure of the spring 306, the steel ball 305 will overcome the elastic force of the spring 306, dislodge from the groove 502, and slip between the opposite end faces of the driving disc 301 and the driven disc 501. This slippage state instantly cuts off the power transmission from the driving disc 301 to the driven disc 501, causing the linkage shaft 1 to rotate freely while the pulley 2 stops or slows down, thus achieving overload protection and effectively preventing damage to the pulley 2 and the motor 4. When the overload situation is eliminated, the steel ball 305 will automatically re-jaw into the groove 502 under the action of the spring 306, restoring the power transmission.

Claims

1. A pulley shaft overload shearing device, comprising: Linkage shaft (1); The active component (3) includes an active disk (301) sleeved on the linkage shaft (1) and rotating synchronously therewith. The driven component (5) includes a driven disk (501) rotatably sleeved on the linkage shaft (1), the driven disk (501) and the end face of the driving disk (301) being disposed opposite to each other; Pulley body (2), which is fixedly connected to the driven disk (501); Its features are, The active disk (301) has a toothed groove (302), and a steel ball (305) and a spring (306) are housed in the toothed groove (302). The spring (306) abuts against the bottom of the toothed groove (302) and the steel ball (305). The driven disk (501) has a groove (502) on its end face opposite to the driving disk (301) that is adapted to the steel ball (305).

2. The shearing device of claim 1, wherein, The active component (3) further includes a threaded sleeve (303), and the driven component (5) further includes a nut (503). The threaded sleeve (303) is coaxially fixed to the active disk (301), and the nut (503) is coaxially disposed inside the driven disk (501). The threaded sleeve (303) is threadedly connected to the nut (503).

3. The shearing device of claim 2, wherein, A vent hole (304) is provided on the outer peripheral wall of the threaded sleeve (303), and the vent hole (304) connects the outside of the threaded sleeve (303) with the internal space of the drive disc (301).

4. The shearing device of claim 1, wherein, The pulley body (2) is located on the side of the driven plate (501) away from the driving plate (301).

5. The shearing device of claim 1, wherein, The active disk (301) has multiple sets of tooth grooves (302) evenly distributed along its circumference, and the driven disk (501) has multiple sets of grooves (502) that correspond one-to-one with the multiple sets of tooth grooves (302).

6. The shearing device of claim 1, wherein, The active disk (301) rotates synchronously with the linkage shaft (1) via a key connection.

7. The shearing device of claim 1, wherein, The spring (306) is a compression spring (306).

8. The shearing device of claim 1, wherein, It also includes a motor (4), the output shaft of which is fixedly connected to the linkage shaft (1).

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