A ring cylinder brake chain tightening device

Abstract

The utility model belongs to coal mine machinery technical field, concretely relates to a kind of annular oil cylinder brake tight chain device, including gear box, column pin, annular oil cylinder, permanent magnet synchronous motor, rectangular compression spring, annular piston, brake disc, positioning sleeve, input shaft assembly, skeleton oil seal and transparent cover.In permanent magnet motor deceleration integrated machine, when scraper conveyor tight chain, chain, frequency converter control permanent magnet motor can be realized scraper conveyor soft start, chain slowly tensioned, when the tension of chain reaches pre-tightening force, to ensure the reliability of driving device, through hydraulic valve group to annular oil cylinder liquid, make piston overcome the compression force of spring, let piston press brake disc, reach the purpose of mechanical braking, motor can be powered off at this time, avoid the phenomenon such as heating of motor low-frequency work, simultaneously realize the security, reliability of chain connection. After scraper conveyor completes chain connection, annular oil cylinder pressure relief, motor energization continues to work.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine machinery technology, specifically relating to a ring cylinder braking and chain tightening device. Background Technology

[0002] In the chain tightening operation of scraper conveyors in coal mines, the braking performance of the chain tightening device directly affects operational efficiency and safety. Currently, the braking components of scraper conveyor chain tightening devices mostly employ traditional hydraulic cylinders or mechanical braking structures. Traditional hydraulic cylinders occupy a large space, limiting installation in compact gearbox layouts, and have slow braking response. Mechanical braking structures (such as ratchet types) have poor reliability, prone to slippage and jamming, making safety difficult to guarantee. Furthermore, the sealing structure design of existing braking devices is not optimized enough, resulting in a high risk of oil leakage and unstable braking pressure, further affecting the chain tightening effect. In addition, the component fitting precision of some devices is insufficient, and the impact force during braking easily causes component wear, shortening the device's service life and increasing maintenance costs and downtime.

[0003] Therefore, there is an urgent need for a braking chain tightening device that is compact, has a fast braking response, is reliable in sealing, and is easy to integrate, in order to solve the above-mentioned defects in the existing technology and meet the needs of efficient and safe chain tightening operation of coal mine scraper conveyors. Utility Model Content

[0004] In view of the technical problems existing in the chain tightening operation of the above-mentioned scraper conveyor in coal mines, this utility model provides a ring cylinder braking chain tightening device.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A ring-shaped hydraulic cylinder braking chain tightening device includes a gearbox, pins, a ring-shaped hydraulic cylinder, a permanent magnet synchronous motor, a rectangular compression spring, a ring piston, a brake disc, a positioning sleeve, an input shaft assembly, a skeleton oil seal, and a through cover. The input shaft assembly is installed inside the gearbox, and the brake disc is mounted on the input shaft assembly and rotates synchronously with it. The ring-shaped hydraulic cylinder is fixed to the gearbox, and the ring piston mates with the inner hole of the ring-shaped hydraulic cylinder to form a sealed space. The pins are evenly distributed and installed on the end face of the gearbox, and the rectangular compression spring is sleeved on the pins and correspondingly embedded in the pin holes of the ring piston, with the rectangular compression spring always in a compressed state. The permanent magnet synchronous motor is fastened to the gearbox, and its internal spline mates with the external spline of the input shaft assembly shaft end. The through cover is installed at the stop of the gearbox, the positioning sleeve is fitted onto the input shaft assembly, and the skeleton oil seal is installed on the positioning sleeve. When the ring-shaped hydraulic cylinder is filled with fluid, it pushes the ring piston to overcome the elastic force of the rectangular compression spring and presses the brake disc to achieve braking. When the ring-shaped hydraulic cylinder is depressurized, the rectangular compression spring pushes the ring piston away from the brake disc to release the brake.

[0006] The annular cylinder has two stepped holes. The end face of the left stepped hole is the positioning surface of the annular piston, and an annular groove is opened at the right stepped hole. The annular groove is connected to the oil inlet of the annular cylinder. Rectangular sealing ring I and rectangular sealing ring II are respectively provided at the mating surfaces of the annular cylinder and the annular piston to seal the gap between them.

[0007] Ten bolts I are evenly distributed around the annular cylinder. An outer stop is provided on the right side of the annular cylinder. The outer stop matches the inner stop of the gearbox. Bolt I and washer I are used to fasten the annular cylinder and gearbox together.

[0008] The annular piston has two shoulders. The end face of the left shoulder is the positioning surface of the annular cylinder. A sealing groove is opened at the second and third stepped shafts of the annular piston. The right end face of the annular piston is evenly distributed with pin holes, and the rectangular compression spring is installed in the corresponding pin holes.

[0009] The pin is a stepped shaft, with its thicker end evenly distributed and assembled inside the gearbox. The pin is axially fixed by a retaining ring through a hole, and a rectangular compression spring is sleeved on the thinner end of the pin.

[0010] When the annular cylinder is not filled with fluid, a 4mm gap is left between the annular piston and the brake disc, and the permanent magnet synchronous motor can drive the input shaft assembly to rotate.

[0011] After the annular cylinder is energized, the oil fills the sealed space and pushes the annular piston toward the brake disc. The piston stroke is 7mm until the input shaft assembly stops rotating.

[0012] The brake disc is axially fixed by a shaft retaining ring and transmits torque to the input shaft assembly via a spline.

[0013] It also includes O-ring I, O-ring II, bolt II, and washer II; O-ring I is installed at the mating point between the input shaft assembly and the cover, and O-ring II is installed at the mating point between the cover and the gearbox; bolt II, together with washer II, is used for fastening the gearbox to the permanent magnet synchronous motor.

[0014] It also includes bolt III and washer III, wherein bolt III and washer III together secure the cover to the stop of the gearbox.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This utility model's annular cylinder braking chain tightening device boasts advantages such as compact structure, strong integration, fast braking response, high reliability, excellent sealing performance, good hydraulic stability, low component wear, long service life, and improved work efficiency and safety. Specifically, it employs an integrated design of the annular cylinder, gearbox, and permanent magnet synchronous motor, significantly saving installation space by utilizing the annular space, and is compatible with the compact layout of scraper conveyors. The annular cylinder directly drives the annular piston, resulting in a short braking response time and eliminating the risk of slippage or jamming. A rectangular compression spring provides stable restoring force. Rectangular sealing rings and O-rings are respectively installed at the mating points between the annular cylinder and the annular piston, the cover and the input shaft assembly, and the gearbox. This multi-layered sealing structure effectively prevents oil leakage and ensures stable hydraulic system pressure. Precise design of the gap between the brake disc and the annular piston, and the piston stroke, combined with the buffering effect of the pin and the rectangular compression spring, and high-precision axial positioning, reduces relative component wear and significantly extends service life. The device is suitable for chain tightening operations on coal mine scraper conveyors, enabling precise control of the chain tightening process. This fundamentally avoids the risk of work interruption and equipment failure caused by brake failure or leakage, ensuring the safety and continuity of operations. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Enlarged view from M; Figure 3 This is a schematic diagram of the structure of the annular hydraulic cylinder of this utility model; Figure 4 This is a schematic diagram of the structure of the annular piston of this utility model; Figure 5 This is a schematic diagram of the structure of the pin and rectangular compression spring of this utility model.

[0019] Wherein: 1 is gearbox, 2 is pin, 3 is bolt I, 4 is washer I, 5 is annular cylinder, 6 is rectangular seal I, 7 is rectangular seal II, 8 is permanent magnet synchronous motor, 9 is shaft retaining ring, 10 is bolt II, 11 is washer II, 12 is rectangular compression spring, 13 is annular piston, 14 is brake disc, 15 is hole retaining ring, 16 is positioning sleeve, 17 is input shaft assembly, 18 is O-ring I, 19 is skeleton oil seal, 20 is cover, 21 is O-ring II, 22 is bolt III, and 23 is washer III. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. These descriptions are only for further illustrating the features and advantages of this utility model, and not for limiting the claims of this utility model. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] This embodiment provides a ring-shaped hydraulic cylinder braking chain tightening device, such as... Figure 1-5 As shown, the actions at each stage are coordinated with the structural features of the device, as detailed below: During normal operation, according to the structural design, the thicker end of pin 2 is axially fixed inside gearbox 1 via a retaining ring 15. A rectangular compression spring 12 is fitted onto the thinner end of pin 2 and remains compressed. Its elastic force pushes the annular piston 13 away from the brake disc 14, maintaining a 4mm gap between them. At this time, the permanent magnet synchronous motor 8, through its internal spline, engages with the external spline on the shaft end of the input shaft assembly 17, driving the input shaft assembly 17 to rotate within gearbox 1. The brake disc 14, through splines, is connected to the input shaft assembly 17 and axially fixed via a retaining ring 9. Therefore, it rotates with the input... The shaft assembly 17 rotates synchronously, while the cover 20 is fastened to the gearbox 1 stop by bolt Ⅲ22 and washer Ⅲ23. The input shaft assembly 17 and the cover 20, and the cover 20 and the gearbox 1 are sealed by O-ring Ⅰ18 and O-ring Ⅱ21 respectively. The gearbox 1 and the permanent magnet synchronous motor 8 are fastened by bolt Ⅱ10 and washer Ⅱ11. The annular cylinder 5 is integrated by the outer stop on the right side and the inner stop on the gearbox 1, and is fastened by 10 evenly distributed bolts Ⅰ3 and washer Ⅰ4. The overall structure is stable and there is no braking interference, ensuring the normal operation of the device.

[0024] When the scraper conveyor needs to tighten or connect the chain and trigger braking, the annular cylinder 5 is energized. Oil enters the annular groove of the right-side stepped hole from the inlet, then fills the sealed space formed by the mating of the annular cylinder 5 and the annular piston 13. Rectangular sealing rings I6 and II7 at the mating surfaces of the annular cylinder 5 and the annular piston 13 ensure no oil leakage. The sealing grooves at the second and third stepped shaft sections of the annular piston 13 provide the mounting base for the sealing rings. The positioning fit between the left shoulder end face and the left stepped hole end face of the annular cylinder 5 ensures precise formation of the sealed space. The pressure pushes the annular piston 13 to move towards the brake disc 14 against the elastic force of the rectangular compression spring 12. After the piston travels 7mm, it comes into close contact with the brake disc 14. As the oil pressure continues to increase, the squeezing force of the annular piston 13 on the brake disc 14 continues to increase until the brake disc 14 stops rotating. Because the brake disc 14 is synchronously driven with the input shaft assembly 17, the input shaft assembly 17 also stops rotating. At this time, the power supply to the permanent magnet synchronous motor 8 can be cut off to avoid the motor from overheating during low-frequency operation, ensuring that the chain tightening and connecting operations are carried out in a safe state where the transmission system is fully braked.

[0025] After the scraper conveyor completes chain tightening and connection, the annular cylinder 5 is depressurized, the oil pressure in the sealed space disappears, the rectangular compression spring 12 returns to its original deformation, and its elastic force pushes the annular piston 13 to return to its original position along the thin end of the pin 2, gradually moving away from the brake disc 14 and returning to the initial state with a distance of 4mm between them. Then the power supply of the permanent magnet synchronous motor 8 is turned on, and the motor drives the input shaft assembly 17 to rotate again through the spline. The brake disc 14 rotates synchronously, and the device returns to normal operation.

[0026] The above description only describes the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model, and all such changes should be included within the protection scope of the present utility model.

Claims

1. A ring-shaped hydraulic cylinder braking chain tightening device, characterized in that: The system includes a gearbox (1), pins (2), annular cylinders (5), a permanent magnet synchronous motor (8), rectangular compression springs (12), annular pistons (13), a brake disc (14), a positioning sleeve (16), an input shaft assembly (17), a skeleton oil seal (19), and a cover (20). The input shaft assembly (17) is installed inside the gearbox (1), and the brake disc (14) is mounted on the input shaft assembly (17) and rotates synchronously with it. The annular cylinder (5) is fixed on the gearbox (1), and the annular piston (13) cooperates with the inner hole of the annular cylinder (5) to form a sealed space. The pins (2) are evenly distributed on the end face of the gearbox (1), and the rectangular compression springs (12) are sleeved on the pins (2) and corresponding to each other. The rectangular compression spring (12) is always in a compressed state, embedded in the pin hole of the annular piston (13); the permanent magnet synchronous motor (8) is fastened to the gearbox (1), and its internal spline is matched with the external spline of the input shaft assembly (17); the cover (20) is installed at the stop of the gearbox (1), the positioning sleeve (16) is assembled on the input shaft assembly (17), and the skeleton oil seal (19) is installed on the positioning sleeve (16); when the annular cylinder (5) is filled with liquid, it pushes the annular piston (13) to overcome the elastic force of the rectangular compression spring (12) and presses the brake disc (14) to achieve braking; when the annular cylinder (5) is depressurized, the rectangular compression spring (12) pushes the annular piston (13) away from the brake disc (14) to release the brake.

2. The annular hydraulic cylinder braking chain tightening device according to claim 1, characterized in that: The annular cylinder (5) is provided with two stepped holes. The end face of the stepped hole on the left is the positioning surface of the annular piston, and an annular groove is provided at the stepped hole on the right. The annular groove is connected to the oil inlet of the annular cylinder (5). Rectangular sealing ring I (6) and rectangular sealing ring II (7) are respectively provided at the mating surfaces of the annular cylinder (5) and the annular piston (13) to seal the gap between them.

3. The annular hydraulic cylinder braking chain tightening device according to claim 1, characterized in that: The annular cylinder (5) is surrounded by 10 bolts I (3). The annular cylinder (5) has an outer stop on the right side. The outer stop is matched with the inner stop of the gearbox (1). The bolts I (3) and washers I (4) are used to fasten the annular cylinder (5) and the gearbox (1) together.

4. The annular hydraulic cylinder braking chain tightening device according to claim 1, characterized in that: The annular piston (13) has two shoulders. The end face of the left shoulder is the positioning surface of the annular cylinder. A sealing groove is opened at the second and third stepped shafts of the annular piston (13). The right end face of the annular piston (13) is evenly distributed with pin holes. The rectangular compression spring (12) is installed in the corresponding pin holes.

5. The annular hydraulic cylinder braking chain tightening device according to claim 1, characterized in that: The pin (2) is a stepped shaft, with its thick end evenly distributed and assembled in the gearbox (1), and the pin (2) is axially fixed by a retaining ring (15) through a hole, and a rectangular compression spring (12) is sleeved on the thin end of the pin (2).

6. The annular hydraulic cylinder braking chain tightening device according to claim 1, characterized in that: When the annular cylinder (5) is not filled with fluid, there is a 4mm gap between the annular piston (13) and the brake disc (14), and the permanent magnet synchronous motor (8) can drive the input shaft assembly (17) to rotate.

7. The annular hydraulic cylinder braking chain tightening device according to claim 1, characterized in that: After the annular cylinder (5) is filled with oil, the oil fills the sealed space and pushes the annular piston (13) to move toward the brake disc (14). The piston stroke is 7mm until the input shaft assembly (17) stops rotating.

8. The annular hydraulic cylinder braking chain tightening device according to claim 1, characterized in that: The brake disc (14) is axially fixed by a shaft retaining ring (9) and transmits torque to the input shaft assembly (17) via a spline.

9. The annular hydraulic cylinder braking chain tightening device according to claim 1, characterized in that: It also includes O-ring I (18), O-ring II (21), bolt II (10), and washer II (11); the O-ring I (18) is installed at the mating point between the input shaft assembly (17) and the cover (20), and the O-ring II (21) is installed at the mating point between the cover (20) and the gearbox (1); the bolt II (10) and washer II (11) are used to fasten the gearbox (1) and the permanent magnet synchronous motor (8).

10. A ring-shaped hydraulic cylinder braking chain tightening device according to claim 1, characterized in that: It also includes bolt III (22) and washer III (23), which together with washer III (23) secure the cover (20) to the stop of the gearbox (1).

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