Torque protector for coal washing equipment

Abstract

The invention relates to the technical field of coal washing equipment, in particular to a torque protector for coal washing equipment, which comprises a transmission shaft, a connecting sleeve is fixedly assembled on the transmission shaft, an indexing ring plate is sleeved on the upper portion of the connecting sleeve, a retaining spring ring plate is sleeved on the lower portion of the connecting sleeve, and the indexing ring plate, the connecting sleeve and the retaining spring ring plate are fixedly connected together through fastening bolts. The fastening bolt is sleeved with a spring, and the spring is located between the connecting sleeve and the baffle spring annular plate. An output ring block is clamped between the indexing ring plate and the connecting sleeve in an abutting mode, and the output ring block, the indexing ring plate and the connecting sleeve form a tooth type connecting structure. The contact surface between the output ring block and the indexing ring plate is a contact surface A, the contact surface between the output ring block and the connecting sleeve is a contact surface B, the forward pressure between the contact surface A and the contact surface B is adjusted by loosening and tightening the fastening bolt, and then the torque value is adjusted; the overload protection function is achieved, and the problem that internal parts are prone to being damaged once an existing differential mechanism is overloaded is solved.

Description

Technical Field

[0001] This invention relates to the field of coal washing equipment technology, specifically a torque protector for coal washing equipment. Background Technology

[0002] Currently, the differential gears used in coal washing equipment are mostly integral box structures, which transmit power through gears, scrapers, screen baskets, etc. Through the relative speed difference between the scraper and the screen basket, the scraper separates the dewatered coal slurry from the screen basket and sends it to the conveyor belt to complete the continuous dewatering operation of the coal slurry.

[0003] However, in practice, impurities such as sawdust and reinforcing bars in the coal slurry are not easily detected. During continuous operation, these impurities may enter between the scraper and the screen basket, jamming them and causing gear wear in the differential, leading to its breakdown. Alternatively, failure to replace faulty bearings inside the centrifuge can also cause gear wear. Repairing these issues requires disassembling and overhauling the entire system, a cumbersome and time-consuming process that severely impacts production. When gear wear occurs, the torque between the scraper and the screen basket increases instantaneously by tens of times, easily damaging internal differential components, especially the bearings.

[0004] Therefore, it is necessary to invent a torque protector for coal washing equipment to protect the internal parts of the differential when gear breakage occurs. Summary of the Invention

[0005] This invention is a torque protector for coal washing equipment, which can provide torque protection for the internal parts of the centrifuge when the coal washing equipment is suddenly overloaded. After the external overload is eliminated, the centrifuge can resume operation on its own without disassembling it.

[0006] This invention is achieved using the following technical solution: A torque protector for a coal washing equipment includes a drive shaft, a connecting sleeve fixedly mounted on the drive shaft, an indexing ring plate fitted on the upper part of the connecting sleeve, and a retaining spring ring plate fitted on the lower part of the connecting sleeve. The indexing ring plate, the connecting sleeve, and the retaining spring ring plate are fixedly connected together by fastening bolts. A spring is fitted on the fastening bolts, and the spring is located between the connecting sleeve and the retaining spring ring plate. An output ring block is engaged and abuts against the indexing ring plate and the connecting sleeve. The output ring block, the indexing ring plate, and the connecting sleeve form a threaded connection structure. The contact surface between the output ring block and the indexing ring plate is contact surface A, and the contact surface between the output ring block and the connecting sleeve is contact surface B. The positive pressure between contact surface A and contact surface B is adjusted by tightening or loosening the fastening bolts, thereby adjusting the torque value.

[0007] Furthermore, the indexing ring plate is provided with threaded holes that extend vertically and are evenly distributed circumferentially, and the connecting sleeve and the retaining spring ring plate are provided with through holes that extend vertically and are evenly distributed circumferentially. The position, number, and shape of the threaded holes and through holes are matched, and the fastening bolts pass through the matching through holes and threaded holes from bottom to top.

[0008] Furthermore, the output ring block includes a drive gear ring, a scraper, or a sieve basket.

[0009] Furthermore, there are a total of 12 threaded holes.

[0010] This invention relates to a torque limiter used in the differential of coal washing equipment, which serves as overload protection and solves the problem that existing differentials are prone to damage to internal parts when overloaded. The invention has a simple structure, protects the gearbox of the reduction differential from damage under overload conditions, and the self-resetting function solves the problems of time-consuming and labor-intensive disassembly and maintenance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention.

[0012] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0013] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0014] Figure 4 This is a schematic diagram of the indexing ring plate in this invention.

[0015] In the diagram: 1-drive shaft, 2-connecting sleeve, 3-indexing ring plate, 4-spring retaining ring plate, 5-fastening bolt, 6-spring, 7-output ring block, 8-threaded hole, 9-scraper, 10-screw. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Example 1

[0017] A torque protector for coal washing equipment can be used on the transmission gear of a reduction differential. By changing the structure of a transmission gear in the transmission system and setting the torque transmission magnitude through tightening bolts, the overload shutdown is achieved when the torque exceeds the preset value, and the machine can automatically resume operation after the debris is removed.

[0018] The following uses a scraper gear as an example to illustrate the structure and working principle of the torque protector, as shown in the attached diagram. Figure 1 Appendix Figure 3 Appendix Figure 4As shown; it includes a drive shaft 1, i.e., a scraper shaft, on which a connecting sleeve 2 is fixedly mounted. The upper half of the connecting sleeve 2 is a three-step shape that is narrower at the top and wider at the bottom, consisting of a first step, a second step, and a third step from top to bottom. The diameter of the lower half of the connecting sleeve 2 is smaller than the diameter of the first step. The first step of the connecting sleeve 2 is fitted with an indexing ring plate 3, and the lower half of the connecting sleeve 2 is fitted with a retaining spring ring plate 4. The indexing ring plate 3, the connecting sleeve 2, and the retaining spring ring plate 4 are fixedly connected together by fastening bolts 5. A spring 6 is fitted on the fastening bolts 5, and the spring 6 is located between the connecting sleeve 2 and the retaining spring ring plate 4.

[0019] The indexing ring plate 3 and the connecting sleeve 2 are engaged and contacted by an output ring block 7, which is the transmission gear ring of the scraper gear. A snap-fit ​​ring is integrally fixed in the middle of the inner ring of the output ring block 7. The snap-fit ​​ring contacts the second step of the connecting sleeve 2. The upper part of the output ring block 7 contacts the side end of the indexing ring plate 3, and the lower part of the output ring block 7 contacts the third step of the connecting sleeve 2. The output ring block 7, the indexing ring plate 3, and the connecting sleeve 2 form a toothed connection structure. The contact surface between the output ring block 7 and the indexing ring plate 3 is contact surface A, and the contact surface between the output ring block 7 and the connecting sleeve 2 is contact surface B. The positive pressure between contact surface A and contact surface B is adjusted by tightening or loosening the fastening bolt 5, thereby adjusting the torque value.

[0020] Furthermore, the indexing ring plate 3 is provided with threaded holes 8 that are vertically penetrating and evenly distributed along the circumference. There are a total of 12 threaded holes 8. The connecting sleeve 2 and the retaining spring ring plate 4 are both provided with through holes that are vertically penetrating and evenly distributed along the circumference. The position, number, and shape of the threaded holes 8 and the through holes are matched. The fastening bolt 5 passes through the matching through holes and threaded holes 8 from bottom to top.

[0021] The output ring block 7 (i.e. the transmission gear ring of the scraper gear) is made of low alloy carburized steel and is heat-carburized to ensure hardness. It is ground to ensure accuracy and meshes with the common shaft gear of the previous stage. During normal operation, the output ring block 7 is subjected to a positive torque. The indexing ring plate 3, the connecting sleeve 2 and the retaining spring ring plate (4) are pressed together by the fastening bolt 5. The fastening bolt 5 is fitted with a spring 6, which is a fatigue-resistant stainless steel spring. The spring 6 is located between the connecting sleeve 2 and the retaining spring ring plate 4. The positive pressure between the contact surface A and the contact surface B is adjusted by loosening or tightening the fastening bolt 5 with a torque wrench, thereby adjusting the torque, i.e. the set torque.

[0022] One end of the drive shaft 1 is connected to the connecting sleeve 2 via a key block, and the other end is connected to the scraper via a key block to transmit torque. When there are impurities between the scraper and the screen basket, the load on the scraper suddenly increases. At this time, the scraper transmits a reverse torque to the indexing ring plate 3 and the connecting sleeve 2 through the drive shaft 1. When this torque is greater than the set torque, the indexing ring plate 3 and the output ring block 7, and the connecting sleeve 2 and the output ring block 7 slip on the contact surface A and contact surface B, respectively, causing the transmission to be interrupted, thereby protecting the parts.

[0023] After the impurities are removed, when the reverse torque transmitted by the scraper to the indexing ring plate 3 and the connecting sleeve 2 is lower than the set torque, the transmission system resets and resumes operation.

[0024] This invention has a simple structure, protects the gearbox of the reduction differential from damage under overload conditions, and its self-resetting function solves the problems of time-consuming and labor-intensive disassembly and maintenance. Example 2

[0025] A torque protector for coal washing equipment can be used on scrapers or screen baskets. The structure and working principle of the torque protector are explained below using a scraper gear as an example. The scraper, used in a vertical centrifuge, dewaters the coal slurry, scrapes it off the screen basket, and transfers it to a conveyor belt for continuous operation. Normally, the scraper is directly connected to the output shaft of the differential, i.e., the scraper shaft. However, in this embodiment, the scraper is connected to a scraper toothed sliding disc, which is connected to the output shaft of the reduction differential and can slide relative to it when the set torque is exceeded.

[0026] As attached Figure 1 Appendix Figure 2 As shown; it includes a drive shaft 1, i.e., a scraper shaft, on which a connecting sleeve 2 is fixedly mounted. The connecting sleeve 2 is a three-step shape that is wider at the top and narrower at the bottom, consisting of a first step, a second step, and a third step from top to bottom. An indexing ring plate 3 is fitted on the third step of the connecting sleeve 2. The diameter of the upper part of the indexing ring plate 3 is the same as the diameter of the first step of the connecting sleeve 2. A retaining spring ring plate 4 is fitted on the lower part of the indexing ring plate 3. The upper part of the indexing ring plate 3, the first step of the connecting sleeve 2, and the retaining spring ring plate 4 are fixedly connected together by fastening bolts 5. A spring 6 is fitted on the fastening bolts 5, and the spring 6 is located between the indexing ring plate 3 and the retaining spring ring plate 4.

[0027] The indexing ring plate 3 and the connecting sleeve 2 are engaged and contacted by an output ring block 7, which is the scraper tooth sliding disc. The side end of the output ring block 7 contacts the second step of the connecting sleeve 2. The output ring block 7, the indexing ring plate 3 and the connecting sleeve 2 form a tooth connection structure. The output ring block 7 and the scraper 9 are fixedly connected by screws 10. The contact surface between the output ring block 7 and the indexing ring plate 3 is contact surface A, and the contact surface between the output ring block 7 and the connecting sleeve 2 is contact surface B. The positive pressure between contact surface A and contact surface B is adjusted by tightening and loosening the fastening bolts 5, thereby adjusting the torque value.

[0028] The indexing ring plate 3 has 12 threaded holes 8 that are vertically penetrating and evenly distributed along the circumference. The connecting sleeve 2 and the retaining spring ring plate 4 both have through holes that are vertically penetrating and evenly distributed along the circumference. The position, number, and shape of the threaded holes 8 and the through holes are matched. The fastening bolt 5 passes through the matching through holes and threaded holes 8 from bottom to top.

[0029] In this embodiment, a torque wrench is used to loosen or tighten the fastening bolt 5 to adjust the retaining spring ring plate 4 to compress the spring 6, thereby adjusting the positive pressure between contact surface A and contact surface B, and thus adjusting the torque value, i.e., the set torque. When the scraper and the screen basket are stuck by foreign objects, and the reduction differential exceeds the set torque, slippage occurs between the indexing ring plate 3 and the output ring block 7, and between the connecting sleeve 2 and the output ring block 7, respectively, on contact surface A and contact surface B, causing the transmission to be interrupted, thereby protecting the parts and preventing damage. After eliminating the external overload fault, when the operating torque is less than the set torque, it can automatically resume normal operation, that is, there is no relative sliding between the indexing ring plate 3 and the output ring block 7, and between the connecting sleeve 2 and the output ring block 7, they rotate together without slippage.

[0030] This invention has a simple structure, protects the gearbox of the reduction differential from damage under overload conditions, and its self-resetting function solves the problems of time-consuming and labor-intensive disassembly and maintenance.

[0031] Embodiments 1 and 2 of the present invention can be installed simultaneously in the vertical centrifuge of the coal washing equipment, or only one of them can be installed.

[0032] In the specific implementation process, in order to make the operation of the equipment visible, displacement sensors are installed on contact surface A and / or contact surface B to monitor the operation of the self-recovering torque protector, thereby gaining real-time control over the operation of the differential gearbox.

[0033] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A torque protector for coal washing equipment, characterized in that: Includes a drive shaft (1), on which a connecting sleeve (2) is fixedly mounted. An indexing ring plate (3) is fitted on the upper part of the connecting sleeve (2), and a retaining spring ring plate (4) is fitted on the lower part of the connecting sleeve (2). The indexing ring plate (3), the connecting sleeve (2), and the retaining spring ring plate (4) are fixedly connected together by a fastening bolt (5). A spring (6) is fitted on the fastening bolt (5), and the spring (6) is located between the connecting sleeve (2) and the retaining spring ring plate (4). The indexing ring plate (3) and the connecting sleeve (2) are engaged and contacted by an output ring block (7). The output ring block (7), the indexing ring plate (3) and the connecting sleeve (2) form a toothed connection structure. The contact surface between the output ring block (7) and the indexing ring plate (3) is contact surface A, and the contact surface between the output ring block (7) and the connecting sleeve (2) is contact surface B. The positive pressure between contact surface A and contact surface B is adjusted by tightening and loosening the fastening bolt (5), thereby adjusting the torque value.

2. The torque protector for coal washing equipment according to claim 1, characterized in that: The indexing ring plate (3) is provided with threaded holes (8) that pass through from top to bottom and are evenly distributed along the circumference. The connecting sleeve (2) and the retaining spring ring plate (4) are both provided with through holes that pass through from top to bottom and are evenly distributed along the circumference. The position, number and shape of the threaded holes (8) and the through holes are matched. The fastening bolt (5) passes through the matching through holes and threaded holes (8) from bottom to top.

3. The torque protector for coal washing equipment according to claim 1, characterized in that: The output ring block (7) includes a drive gear ring, a scraper, or a sieve basket.

4. A torque protector for coal washing equipment according to claim 1, characterized in that: There are a total of 12 threaded holes (8).

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