Device overload protection for coal mining machinery

Abstract

The utility model discloses a coal mine machinery's equipment overload protection device relates to coal mine machinery equipment technical field, and this device includes the coupling mechanism, and it is equipped with the recessed groove of the snap -block -engaging of the installation shell and the rotating shell of inside and outside nesting and rotatable, and the rotating shell is equipped with the notch, and the notch is aligned with the recessed groove through the rotation rotating shell, can take out the snap -block to realize the quick replacement of friction plate, and spring can drive rotating shell automatic rotation reset locking after replacement, and the device still can adjust the pressure of the friction plate through the replacement of different second spring, thereby conveniently change the critical torque of overload protection, the utility model solves the existing device friction plate replacement difficult, the protection torque adjustment inconvenient problem, has the beneficial effect of replacement high efficiency, regulation nimble, maintenance strong.

Description

Technical Field

[0001] This utility model relates to the field of coal mining machinery and equipment technology, and in particular to an overload protection device for coal mining machinery. Background Technology

[0002] In coal mining and transportation operations, scraper conveyors are key equipment for achieving continuous coal transport. They are typically driven by high-power motors to make chains and scrapers reciprocate. Due to the complex working environment underground, the uneven hardness of coal, and the presence of large rocks or other debris, the load on scraper conveyors during operation is extremely unstable. When the scraper chain is jammed by large pieces of material or other mechanical failures occur, a huge instantaneous impact torque is generated. If the power is not cut off in time, it can lead to motor overload and burnout, or even serious mechanical accidents such as chain breakage and gear damage to the reducer. This not only results in high maintenance costs but also causes long-term production stoppages and huge economic losses.

[0003] To address this issue, overload protection devices are commonly installed in existing coal mine machinery drive systems. Among them, friction torque limiters (or friction clutches) are a common technical solution. Their basic principle is to apply pressure through a spring to tightly press the friction plates between the driving and driven parts to transmit the rated torque. When the load torque exceeds the maximum static friction torque determined by the spring pressure, the friction plates will slip, thereby interrupting the power transmission and playing an overload protection role.

[0004] The friction plate, as a core working component, is a wear part. After repeated overload slippage, it will wear down, resulting in a decrease in the protection torque. It needs to be inspected and replaced regularly. However, in the existing structure, replacing the friction plate usually requires extensive disassembly of the coupling mechanism, which is a cumbersome and complicated process. This is especially difficult to carry out in the confined space and harsh environment of underground coal mines, consuming a lot of maintenance time. Secondly, the load characteristics of different coal mining faces or the same working face at different stages may change, requiring corresponding adjustments to the critical torque of overload protection. However, the torque adjustment mechanism of the existing device is usually quite complex, inconvenient to adjust and not very accurate, making it difficult to quickly adapt to the changing working conditions.

[0005] Therefore, this utility model proposes an overload protection device for coal mining machinery to address the shortcomings of existing technologies. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides an overload protection device for coal mining machinery, aiming to improve the problems in the existing technology of overload protection devices for coal mining machinery, such as the complicated and time-consuming replacement process of core vulnerable parts such as friction plates, and the difficulty in conveniently adjusting the critical torque of overload protection according to changes in working conditions.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an overload protection device for coal mining machinery, comprising a motor, a rotating shaft, and a coupling mechanism connecting the motor and the rotating shaft. The coupling mechanism includes a mounting shell for receiving motor torque, a friction joint fixedly connected to the rotating shaft, a friction plate disposed between the mounting shell and the friction joint, and a locking block for transmitting torque; and a rotating shell sleeved outside the mounting shell.

[0008] The rotating shell has a notch for the locking block to slide out.

[0009] The mounting shell has a groove for engaging the locking block. The rotating shell is fitted onto the outside of the mounting shell, and the locking block is locked or released by the relative rotation of its notch with the groove of the mounting shell to achieve alignment or misalignment.

[0010] Preferably, the coupling mechanism further includes a first spring and a baffle, which are disposed between the mounting shell and the rotating shell to lock the rotating shell when the notch of the rotating shell is misaligned with the groove of the mounting shell.

[0011] Preferably, the baffles are fixedly connected to the outer wall of the mounting shell and the inner wall of the rotating shell, and the first spring is disposed between the baffles.

[0012] Preferably, the coupling mechanism further includes a second spring and a sliding plate, the sliding plate being connected to the second spring and used to push the friction plate.

[0013] Preferably, the outer wall of the mounting shell is provided with an annular groove, and the rotating shell is engaged in the annular groove.

[0014] Preferably, the device further includes a gear fixed to the rotating shaft, a chain engaging with the gear, and a scraper fixed to the chain, and is provided with a base plate for the scraper to slide and side plates located on both sides of the base plate.

[0015] Preferably, the device further includes a heat dissipation mechanism, which includes wave-shaped heat dissipation fins disposed on the surface of the motor, and heat dissipation holes are formed on the wave-shaped heat dissipation fins.

[0016] Preferably, the heat dissipation mechanism includes a mounting bracket and a cooling fan fixed in the mounting bracket, the cooling fan being used to dissipate the heat dissipated by the wave-shaped heat dissipation fins.

[0017] This utility model has the following beneficial effects:

[0018] 1. In this utility model, by setting a mounting shell and a rotating shell that can rotate relative to each other, and by using the alignment and misalignment of the openings of the two to control the installation and removal of the card block, the problem of complex structure and difficult and time-consuming replacement of core friction components in existing overload protection devices is solved. This achieves the technical effect of being able to quickly and conveniently replace friction plates, significantly shortening equipment maintenance time, and improving equipment maintainability and production continuity.

[0019] 2. In this utility model, by using a replaceable second spring to apply pre-tightening pressure to the friction plate via a sliding plate, the problem of fixed or inconvenient adjustment of the protection torque value of existing overload protection devices is solved. This achieves the technical effect of being able to easily adjust the overload protection critical torque by simply replacing the spring according to the working conditions, thereby improving the adaptability of the device to different working environments. Attached Figure Description

[0020] Figure 1 This is a perspective view of the equipment overload protection device for coal mining machinery proposed in this utility model.

[0021] Figure 2 An exploded schematic diagram of the friction plate of the equipment overload protection device for coal mining machinery proposed in this utility model;

[0022] Figure 3 This is a schematic diagram of the baffle of the equipment overload protection device for coal mining machinery proposed in this utility model;

[0023] Figure 4 This is a cross-sectional schematic diagram of the rotating housing of the equipment overload protection device for coal mining machinery proposed in this utility model;

[0024] Figure 5 This is an exploded schematic diagram of the waveform heat dissipation fins of the equipment overload protection device for coal mining machinery proposed in this utility model.

[0025] Legend:

[0026] 1. Motor; 2. Shaft; 3. Coupling mechanism; 301. Mounting housing; 302. Annular groove; 303. Baffle; 304. First spring; 305. Second spring; 306. Sliding plate; 307. Locking block; 308. Friction plate; 309. Rotating housing; 310. Friction joint; 4. Heat dissipation mechanism; 401. Wave-shaped heat dissipation fins; 402. Heat dissipation holes; 403. Mounting bracket; 404. Cooling fan; 5. Gear; 6. Chain; 7. Side plate; 8. Base plate; 9. Scraper. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Reference Figures 1-5 This utility model provides an embodiment of an overload protection device for coal mining machinery, which aims to solve the problems of difficult replacement of friction plates and inconvenient adjustment of overload protection torque threshold in existing coal mining machinery overload protection devices.

[0029] The overload protection device for this coal mining machinery includes a motor 1 and a rotating shaft 2 connected to and driven by the motor 1 via a coupling mechanism 3. The motor 1 is the power source of the entire device, used to output rotational torque. The rotating shaft 2 serves as the output end for power transmission, used to drive the subsequent conveying mechanism. The coupling mechanism 3 is located between the motor 1 and the rotating shaft 2, not only transmitting the torque of the motor 1 to the rotating shaft 2, but also providing overload protection to ensure that the equipment is not damaged under abnormal operating conditions. The coupling mechanism 3 is the core component of this utility model, making the replacement of the friction plate 308 quick and easy, and allowing the critical torque of the overload protection to be adjusted according to actual needs.

[0030] The coupling mechanism 3 also includes a mounting housing 301, and the mounting housing 301 forms a specific structural fit and connection relationship with the aforementioned motor 1 and rotating shaft 2. Please refer to the attached drawings for a detailed description of this core structure below.

[0031] The mounting shell 301 inside the coupling mechanism 3 is a hollow cylindrical component. One end of its flange is connected to the output shaft of the motor 1 to receive the torque transmitted by the motor 1. The inner wall of the mounting shell 301 is provided with multiple grooves along its circumference. These grooves are used to engage the locking block 307. The locking block 307 is rectangular and can be slidably engaged in the grooves of the mounting shell 301. When the mounting shell 301 rotates with the motor 1, the locking block 307 is driven by the grooves, thereby transmitting the torque to the friction plate 308.

[0032] The coupling mechanism 3 also includes a friction joint 310, which is disc-shaped. One end of the friction joint 310 is fixedly connected to the rotating shaft 2 to ensure that torque can be transmitted from the friction joint 310 to the rotating shaft 2. The other end of the friction joint 310 is in close contact with a friction plate 308, which is an annular disc-shaped material disposed inside the mounting housing 301 between the friction joint 310 and the friction plate 308. Through the friction between the friction plate 308 and the friction joint 310, the torque of the motor 1 is finally transmitted to the rotating shaft 2.

[0033] When the equipment is overloaded, if the torque transmitted in the reverse direction by the rotating shaft 2 exceeds the maximum static friction between the friction plate 308 and the friction joint 310, the friction plate 308 will slip, thereby cutting off the power transmission and protecting the motor 1 and other mechanical components from damage.

[0034] To facilitate the replacement of the friction plate 308 and the adjustment of the overload protection critical torque, the coupling mechanism 3 further includes a rotating housing 309, which is fitted onto the outside of the mounting housing 301. The rotating housing 309 is a hollow cylinder with two circumferential notches on its inner wall. These notches can be aligned with the grooves in the mounting housing 301 at specific positions. When the notches of the rotating housing 309 are aligned with the grooves in the mounting housing 301, the locking block 307 can slide out of the groove, thereby facilitating the removal and replacement of the friction plate 308. One end of the rotating housing 309 is engaged with an annular groove 302 on the outer wall of the mounting housing 301 via a bearing, allowing the rotating housing 309 to rotate freely relative to the mounting housing 301 while preventing axial dislodgement. This design of the inner and outer housings greatly facilitates the rapid replacement of the friction plate and the maintenance of the device.

[0035] The coupling mechanism 3 also includes a second spring 305 and a sliding plate 306. The second spring 305 is a helical compression spring, and the sliding plate 306 is a disc. The second spring 305 is disposed between the sliding plate 306 and the mounting shell 301. The sliding plate 306 pushes the friction plate 308, thereby generating a positive pressure that makes the friction plate 308 and the friction joint 310 in close contact. By replacing the second spring 305 with different stiffness, the positive pressure applied to the friction plate 308 can be changed, thereby adjusting the critical value of the friction force and thus changing the critical torque of the overload protection to adapt to the protection requirements under different working conditions.

[0036] Regarding the material selection for friction plate 308, friction joint 310, and locking block 307, those skilled in the art can use conventional materials such as metals, ceramics, and composite materials according to the required performance requirements such as friction coefficient, wear resistance, and strength. Their specific internal structures are well-known technologies in the field and will not be described in detail here.

[0037] In a preferred embodiment, in order to achieve automatic reset and locking of the rotating housing 309 after the friction plate 308 is replaced, the coupling mechanism 3 further includes a first spring 304 and a baffle 303. The baffle 303 is fixedly connected to the outer wall of the mounting housing 301 and the inner wall of the rotating housing 309, respectively. The first spring 304 is disposed between the two baffles 303 and is used to push the baffles 303 under the reaction force, thereby driving the rotating housing 309 to rotate relative to the mounting housing 301, so that the notch of the rotating housing 309 is misaligned with the groove of the mounting housing 301 to lock the locking block 307.

[0038] In a preferred embodiment, in order to adjust the overload protection torque of the entire device, the coupling mechanism 3 also includes a second spring 305 and a sliding plate 306. The sliding plate 306 is connected to the second spring 305 and is used to apply the elastic force of the second spring 305 to the friction plate 308. The critical torque of overload protection can be changed by replacing the second spring 305 with a different specification.

[0039] In a preferred embodiment, in order to apply this device to a scraper conveyor, a gear 5 is fixed on the rotating shaft 2, the gear 5 engages with the chain 6 for transmission, a scraper 9 is fixedly connected to the chain 6, and a base plate 8 for the scraper 9 to slide on and side plates 7 located on both sides of the base plate 8 are provided.

[0040] In a preferred embodiment, in order to effectively dissipate heat from the motor 1 that has been working for a long time, the device also includes a heat dissipation mechanism 4. The heat dissipation mechanism 4 includes a wave-shaped heat dissipation fin 401 integrally formed on the surface of the motor 1. The wave-shaped heat dissipation fin 401 has heat dissipation holes 402 to increase the heat dissipation area. The heat dissipation mechanism 4 also includes a mounting bracket 403 fixed to one side of the side plate 7, and a cooling fan 404 fixed in the mounting bracket 403. The cooling fan 404 is used to dissipate the heat carried out by the wave-shaped heat dissipation fin 401.

[0041] Working principle: Motor 1 drives shaft 2 to rotate through coupling mechanism 3. Gear 5 on the outside of shaft 2 engages chain 6 to rotate, causing scraper 9 fixed on chain 6 to slide on top of base plate 8, scraping and transmitting coal between side plates 7 forward. The torque of motor 1 is transmitted to friction plate 308 through groove engaging block 307 in mounting housing 301, and then transmitted to shaft 2 through friction between friction plate 308 and one end of friction joint 310. When the equipment is overloaded, slippage occurs between friction plate 308 and friction joint 310, thereby achieving a protection effect and preventing damage to motor 1 or conveying mechanism due to overload. At the same time, by replacing different second springs 305, the critical value of slippage friction can be changed, thereby changing the critical torque of overload protection to adapt to different working conditions.

[0042] When replacing the friction plate 308, first rotate the rotating housing 309 to align the notch of the rotating housing 309 with the groove of the mounting housing 301. The locking block 307 can then slide out to remove the friction plate 308. After replacement, release the rotating housing 309. At this point, under the reaction force of the first spring 304, the baffle 303 is pushed. Since the two baffles 303 are respectively fixedly connected to the outer wall of the mounting housing 301 and the inner wall of the rotating housing 309, the rotating housing 309 rotates relative to the mounting housing 301, misaligning the notch with the groove. One end of the rotating housing 309 engages in the annular groove 302 on the outer wall of the mounting housing 301, fixing the friction plate 308 inside the mounting housing 301, ensuring its stability and safety during use.

[0043] During the heat dissipation process of motor 1, the corrugated heat dissipation fins 401 connected to its surface conduct heat away, and the heat dissipation holes 402 increase the heat dissipation area. A cooling fan 404 is fixed in the mounting bracket 403 on one side of the side plate 7. The cooling fan 404 blows away the heat conducted by the corrugated heat dissipation fins 401, thereby achieving the purpose of heat dissipation of the motor and ensuring the stable operation of motor 1 for a long time.

Claims

1. An overload protection device for coal mining machinery, comprising a motor (1), a rotating shaft (2), and a coupling mechanism (3) connecting the motor (1) and the rotating shaft (2), characterized in that: The coupling mechanism (3) includes a mounting housing (301) for receiving the torque of the motor (1), a friction joint (310) fixedly connected to the rotating shaft (2), and a friction plate (308) disposed between the mounting housing (301) and the friction joint (310). The mounting housing (301) is provided with a groove, and the locking block (307) is engaged in the groove and used to transmit the torque of the mounting housing (301) to the friction plate (308). The coupling mechanism (3) further includes a rotating shell (309) sleeved outside the mounting shell (301), and the rotating shell (309) has a notch for the locking block (307) to slide out.

2. The equipment overload protection device for coal mining machinery according to claim 1, characterized in that, The coupling mechanism (3) further includes a first spring (304) and a baffle (303). The first spring (304) pushes the baffle (303) under the reaction force. The baffle (303) drives the rotating shell (309) to rotate relative to the mounting shell (301), so that the notch is misaligned with the groove, thereby locking the locking block (307).

3. The equipment overload protection device for coal mining machinery according to claim 2, characterized in that, The baffle (303) is fixedly connected to the outer wall of the mounting shell (301) and the inner wall of the rotating shell (309), respectively, and the first spring (304) is disposed between the baffle (303).

4. The equipment overload protection device for coal mining machinery according to claim 1, characterized in that, The coupling mechanism (3) further includes a second spring (305) and a sliding plate (306), the sliding plate (306) being connected to the second spring (305) and used to push the friction plate (308).

5. The equipment overload protection device for coal mining machinery according to claim 1, characterized in that, The outer wall of the mounting shell (301) is provided with an annular groove (302), and the rotating shell (309) is engaged in the annular groove (302).

6. The equipment overload protection device for coal mining machinery according to claim 1, characterized in that, The device also includes a gear (5) fixed to the rotating shaft (2), a chain (6) engaged with the gear (5), and a scraper (9) fixed to the chain (6). The device also has a base plate (8) and side plates (7) located on both sides of the base plate (8). The scraper (9) slides on the top of the base plate (8).

7. The equipment overload protection device for coal mining machinery according to claim 1, characterized in that, The device also includes a heat dissipation mechanism (4), which includes a wave-shaped heat dissipation fin (401) disposed on the surface of the motor (1), and heat dissipation holes (402) are provided on the wave-shaped heat dissipation fin (401).

8. The equipment overload protection device for coal mining machinery according to claim 7, characterized in that, The heat dissipation mechanism (4) also includes a mounting bracket (403) and a cooling fan (404) fixed to one side of the side plate (7). The cooling fan (404) blows away the heat dissipated by the wave-shaped heat dissipation fins (401).

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