A pollution prevention system and method for hydraulic systems in fully mechanized mining faces

Abstract

A contamination prevention system for a fully mechanized mining face hydraulic system includes multiple contamination prevention devices mounted on hydraulic cylinders. Each device includes a contact ring fitted onto a plunger of the hydraulic cylinder. An annular flow channel is formed on each of the two end faces of the contact ring, and these channels are connected to multiple flow grooves penetrating the inner wall of the contact ring. One flow channel facing the cylinder body is also connected to at least one suction pipe, and the other flow channel facing away from the cylinder body is also connected to at least one injection pipe. This invention provides a contamination prevention system and method for a fully mechanized mining face hydraulic system, which can prevent the emulsion from the hydraulic cylinder system from flowing into the environment and causing contamination, and also prevent dust and other impurities on the fully mechanized mining face from contaminating the emulsion with the plunger, ensuring the stable operation of the hydraulic system.

Description

Technical Field

[0001] This invention relates to the field of coal mine hydraulic systems, specifically to a pollution prevention system and method for a fully mechanized mining face hydraulic system. Background Technology

[0002] The hydraulic system used in fully mechanized longwall mining faces in coal mines mainly refers to multiple sets of hydraulic shield supports and corresponding supporting emulsion feed and return pipeline systems. The emulsion is uniformly mixed with water in the emulsion pump box and fed into the inlet chambers of each hydraulic support by the emulsion pump station. Then, it flows directly back to the emulsion pump box from the outlet of each hydraulic support, completing one cycle. During long-term use, the hydraulic system may be contaminated by both the surrounding environment (primarily because the plunger carries dust and other impurities adhering to its surface into the cylinder during retraction, contaminating the emulsion) and the surrounding environment (primarily because the emulsion adhering to the plunger diffuses into the surrounding air during extension).

[0003] In the existing technology, the main pollution prevention measures for the hydraulic system of fully mechanized mining face are to filter the contaminated emulsion, etc. The core purpose is to ensure the normal operation of the hydraulic system, but there are no effective protective measures against pollution caused by the diffusion of emulsion into the environment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a pollution prevention system and method for a hydraulic system in a fully mechanized mining face. This system can prevent the emulsion from the hydraulic cylinder system from flowing out into the environment and causing pollution, and also prevent dust and other impurities on the fully mechanized mining face from contaminating the emulsion with the plunger, thus ensuring the stable operation of the hydraulic system.

[0005] To achieve the above objectives, the specific solution adopted by the present invention is as follows: a pollution prevention system for a hydraulic system of a fully mechanized mining face, comprising multiple pollution prevention devices installed on the hydraulic cylinder. Each pollution prevention device includes a contact ring sleeved on the plunger of the hydraulic cylinder. An annular flow channel is provided on each of the two end faces of the contact ring, and the flow channel is connected to multiple flow grooves penetrating the inner wall of the contact ring. One flow channel facing the cylinder body of the hydraulic cylinder is also connected to at least one suction pipe, and one flow channel facing away from the cylinder body of the hydraulic cylinder is also connected to at least one injection pipe.

[0006] As a further optimization of the anti-pollution system for the hydraulic system of the above-mentioned fully mechanized mining face: an inner sleeve is sleeved around the contact ring, and at least one suction channel and at least one injection channel are provided on the inner sleeve. Both the suction channel and the injection channel extend along the axial direction of the inner sleeve and pass through the end of the inner sleeve facing away from the cylinder body. The suction channel is used to connect the guide channel and the suction pipe, and the injection channel is used to connect the guide channel and the injection pipe.

[0007] As a further optimization of the anti-pollution system for the hydraulic system of the above-mentioned fully mechanized mining face: the suction channel and the guide channel, as well as the injection channel and the guide channel, are all connected by a connecting pipe, and the suction channel, the injection channel and the guide channel are all connected by a docking hole for accommodating the connecting pipe.

[0008] As a further optimization of the anti-pollution system used in the hydraulic system of the above-mentioned fully mechanized mining face: the connecting pipe includes a pipe body, both ends of which are provided with sealing rings, and the outer diameter of the sealing rings is larger than the outer diameter of the pipe body.

[0009] As a further optimization of the anti-pollution system used in the hydraulic system of the above-mentioned fully mechanized mining face: an annular slot is opened on the outer wall of each end of the pipe body, a positioning ring is set in the slot, and the positioning ring extends out of the slot. The positioning ring is fixedly connected to the sealing ring through a connecting sleeve.

[0010] As a further optimization of the anti-pollution system for the hydraulic system of the above-mentioned fully mechanized mining face: an outer sleeve is detachably connected to the peripheral wall of the inner sleeve, and the outer sleeve is sleeved on the cylinder body and fixed by fastening components.

[0011] As a further optimization of the anti-pollution system for the hydraulic system of the above-mentioned fully mechanized mining face: the fastening component includes a hoop fixedly connected to the outer sleeve on the same axis, and a fastening ring is detachably connected to the outer wall of the hoop.

[0012] As a further optimization of the anti-pollution system for the hydraulic system of the above-mentioned fully mechanized mining face: the system also includes an airflow device, which includes a housing. The housing is connected to two air guide pipes. One air guide pipe is connected to all the injection pipes and is equipped with an exhaust fan inside. The other air guide pipe is connected to all the suction pipes and is equipped with an intake fan inside. A filter assembly is detachably installed inside the housing and is located between the two air guide pipes.

[0013] As a further optimization of the anti-pollution system used in the hydraulic system of the above-mentioned fully mechanized mining face: the filter assembly includes a frame and a filter screen fixedly installed inside the frame. A disassembly groove is provided on the side wall of the box. After the frame extends out of the disassembly groove, a connecting plate is fixedly connected to it. The connecting plate is detachably connected to the box.

[0014] A method for preventing contamination in a hydraulic system for a fully mechanized mining face, based on the aforementioned method for preventing contamination in a hydraulic system for a fully mechanized mining face, the method comprising the following steps:

[0015] S1. Deploy the system and install the anti-pollution device on the hydraulic cylinder accordingly;

[0016] S2. During the extension of the plunger of the hydraulic cylinder, the suction tube is used to create a negative pressure in the guide channel to draw away the seeping emulsion.

[0017] S3. During the retraction of the hydraulic cylinder plunger, the injection pipe creates a positive pressure environment in the flow channel to blow away impurities attached to the plunger.

[0018] Beneficial effects: This invention can prevent the emulsion of the hydraulic cylinder system from flowing out into the environment and causing pollution, and can also prevent dust and other impurities on the longwall mining face from contaminating the emulsion with the plunger, thus ensuring the stable operation of the hydraulic system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pollution prevention device;

[0020] Figure 2 This is a schematic diagram of the contact ring structure;

[0021] Figure 3 This is a schematic diagram of the structure of a connecting pipe;

[0022] Figure 4 This is a schematic diagram of the airflow device.

[0023] Attached Figure Descriptions: 1-Cylinder block, 2-Plunger, 3-Clamping ring, 4-Fasting ring, 5-Outer sleeve, 6-Connecting bolt, 7-Inner sleeve, 8-Suction channel, 9-Injection channel, 10-Suction pipe, 11-Injection pipe, 12-Connecting pipe, 13-Contact ring, 14-Guide groove, 15-Guide channel, 16-Mating hole, 17-Pipe body, 18-Positioning ring, 19-Connecting sleeve, 20-Sealing ring, 21-Box body, 22-Positioning seat, 23-Filter screen, 24-Air guide pipe, 25-Outlet fan, 26-Frame body, 27-Connecting plate, 28-Cover plate, 29-Through hole, 30-Inlet fan. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1 and 2As shown, a pollution prevention system for a hydraulic system in a fully mechanized mining face includes multiple pollution prevention devices installed on the hydraulic cylinder. Each pollution prevention device includes a contact ring 13 sleeved on the plunger 2 of the hydraulic cylinder. An annular guide channel 15 is provided on each of the two end faces of the contact ring 13, and the guide channel 15 is connected to multiple guide grooves 14 penetrating the inner wall of the contact ring 13. One guide channel 15 facing the cylinder body 1 of the hydraulic cylinder is also connected to at least one suction pipe 10, and the other guide channel 15 facing away from the cylinder body 1 of the hydraulic cylinder is also connected to at least one injection pipe 11.

[0026] During the excavation of the fully mechanized mining face, a pollution prevention device is installed on the hydraulic cylinder. Specifically, a contact ring 13 is fitted onto the plunger 2 of the hydraulic cylinder. Then, during the operation of the hydraulic cylinder, when the plunger 2 extends, a negative pressure environment is created in a guide channel 15 facing the cylinder body 1 using an air extraction device through a suction pipe 10, thereby removing the emulsion adhering to the surface of the plunger 2 and preventing the emulsion from polluting the environment. When the plunger 2 retracts, a positive pressure environment is created in a guide channel 15 facing away from the cylinder body 1 using an air jet device through a jet pipe 11, thereby blowing away the impurities adhering to the surface of the plunger 2 and preventing the impurities from contaminating the emulsion.

[0027] This invention can prevent the emulsion of the hydraulic cylinder system from flowing out into the environment and causing pollution, and can also prevent dust and other impurities on the longwall mining face from contaminating the emulsion with the plunger 2, thus ensuring the stable operation of the hydraulic system.

[0028] Considering that both the suction pipe 10 and the injection pipe 11 require external equipment, and that the guide channel 15 connecting the suction pipe 10 faces the cylinder body 1, which would obstruct the installation of the suction pipe 10 and its connection with the suction equipment, an inner sleeve 7 is fitted around the periphery of the contact ring 13 to avoid this situation. The inner sleeve 7 has at least one suction channel 8 and at least one injection channel 9. Both the suction channel 8 and the injection channel 9 extend axially along the inner sleeve 7 and penetrate the end of the inner sleeve 7 facing away from the cylinder body 1. The suction channel 8 connects the guide channel 15 and the suction pipe 10, and the injection channel 9 connects the guide channel 15 and the injection pipe 11. By adding the inner sleeve 7 and providing the suction channel 8 and injection channel 9, both facing away from the cylinder body 1, it is easier to install the suction pipe 10 and the injection pipe 11, and easier to connect the suction equipment and the injection equipment.

[0029] To improve the sealing performance between the inner sleeve 7 and the contact ring 13 and prevent air leakage, the suction channel 8 and the guide channel 15, as well as the injection channel 9 and the guide channel 15, are connected by a connecting pipe 12. The suction channel 8, injection channel 9, and guide channel 15 are all connected to a mating hole 16 for accommodating the connecting pipe 12. The connecting pipe 12 can be inserted into the suction channel 8, injection channel 9, or guide channel 15 through the mating hole 16, thereby preventing gas leakage from the gap between the contact ring 13 and the inner sleeve 7.

[0030] like Figure 3 As shown, the specific structure of the connecting pipe 12 is as follows: the connecting pipe 12 includes a pipe body 17, and sealing rings 20 are provided at both ends of the pipe body 17, and the outer diameter of the sealing rings 20 is larger than the outer diameter of the pipe body 17. The sealing rings 20 can further enhance the sealing performance between the pipe body 17 and each channel, thereby further preventing gas leakage.

[0031] The sealing ring 20 is specifically configured as follows: An annular slot is provided on the outer wall of each end of the tube body 17, and a positioning ring 18 is placed in the slot, extending out of the slot. The positioning ring 18 is fixedly connected to the sealing ring 20 via a connecting sleeve 19. The sealing ring 20, connecting sleeve 19, and positioning ring 18 are all made of elastic material, allowing them to be compressed during the insertion of the connecting tube 12 into each channel, thus ensuring smooth insertion of the connecting tube 12. Furthermore, they can expand after the connecting tube 12 is in place, thereby limiting the position of the connecting tube 12 and ensuring its stability.

[0032] To facilitate the installation of the anti-pollution device and avoid damage to the hydraulic cylinder itself, an outer sleeve 5 is detachably connected to the peripheral wall of the inner sleeve 7 via multiple connecting bolts 6. The outer sleeve 5 is fitted onto the cylinder body 1 and secured by a fastening assembly. The fastening assembly includes a clamping ring 3 coaxially fixedly connected to the outer sleeve 5, and a fastening ring 4 is detachably connected to the outer wall of the clamping ring 3. By utilizing the cooperation of the clamping ring 3 and the fastening ring 4, the outer sleeve 5 is secured to the cylinder body 1 without the need for drilling or other operations on the cylinder body 1, thereby avoiding damage to the cylinder body 1.

[0033] To simplify the system structure, the present invention combines the suction device and the jetting device into one unit. Specifically, the system also includes an airflow device, which comprises a housing 21 connected to two air guide pipes 24. One air guide pipe 24 is connected to all jet pipes 11 and has an exhaust fan 25 inside. The other air guide pipe 24 is connected to all suction pipes 10 and has an intake fan 30 inside. A filter assembly is detachably installed inside the housing 21, located between the two air guide pipes 24. In the airflow device, the exhaust fan 25 is used to discharge the gas in the housing 21, realizing the jetting function, and the intake fan 30 is used to draw external gas into the housing 21, realizing the suction function. The air guide pipes 24 are used to connect to the jet pipes 11 or the suction pipes 10. In use, by controlling the operation of the exhaust fan 25 and the intake fan 30, the jetting or suction function can be achieved, thereby drawing the emulsion adhering to the surface of the plunger 2 into the housing 1, or blowing away the impurities adhering to the surface of the plunger 2. The filter assembly prevents the emulsion that is drawn in during the pumping process from being blown out again during the blowing process, thus preventing environmental pollution.

[0034] Because the air duct 24 needs to connect to multiple injection pipes 11 or suction pipes 10, for ease of connection, the end of the air duct 24 away from the housing 21 is closed by a cover plate 28, and the cover plate 28 has multiple through holes 29 for connecting the injection pipes 11 or suction pipes 10.

[0035] like Figure 4 As shown, after a period of use, the filter assembly may become clogged, resulting in a decrease in filtration efficiency and requiring cleaning. To facilitate the removal, cleaning, or replacement of the filter assembly, the filter assembly includes a frame 26 and a filter screen 23 fixedly installed inside the frame 26. A disassembly slot is provided on the side wall of the housing 21. After the frame 26 extends out of the disassembly slot, a connecting plate 27 is fixedly connected, and the connecting plate 27 is detachably connected to the housing 21. When it is necessary to remove the filter assembly, simply disassemble the connecting plate 27 from the housing 21 and then pull the filter assembly out through the disassembly slot, which is simple and convenient. The connecting plate 27 and the housing 21 can be connected by bolts. It should be noted that, in order to ensure the filtration effect, when the frame 26 is inserted into the housing 21, it needs to fit snugly against the inner wall of the housing 21. If necessary, a sealing ring can be added around the frame 26 to prevent the gas containing emulsion drawn in by the intake fan 30 from bypassing the filter screen 23 and being directly blown out by the exhaust fan 25.

[0036] To improve the stability of the filter assembly and prevent gas containing emulsion from being blown out directly by the exhaust fan 25 without passing through the filter screen 23 due to the filter assembly shaking, a positioning seat 22 is fixedly installed at the bottom inside the housing 21. The disassembly and assembly slot is opened on the top of the housing 21. The positioning seat 22 has a receiving groove in the middle for holding the frame 26. Inserting the frame 26 into the receiving groove can position the frame 26, thereby preventing the filter assembly from tilting.

[0037] A method for preventing contamination in a hydraulic system for a fully mechanized mining face, based on the aforementioned method for preventing contamination in a hydraulic system for a fully mechanized mining face, includes steps S1 to S3.

[0038] S1. Deployment system: Install the anti-pollution device on the hydraulic cylinder accordingly.

[0039] S2. During the extension of the plunger 2 of the hydraulic cylinder, the suction pipe 10 creates a negative pressure in the guide channel 15 to draw away the seeping emulsion.

[0040] S3. During the retraction of the plunger 2 of the hydraulic cylinder, a positive pressure environment is formed in the guide channel 15 by the injection pipe 11 to blow away the impurities attached to the plunger 2.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pollution prevention system for a hydraulic system in a fully mechanized mining face, characterized in that: The device includes multiple anti-pollution devices installed on the hydraulic cylinder. The anti-pollution devices include a contact ring (13) sleeved on the plunger (2) of the hydraulic cylinder. Each of the two end faces of the contact ring (13) is provided with an annular flow channel (15). The flow channel (15) is connected to multiple flow grooves (14) that penetrate the inner wall of the contact ring (13). One flow channel (15) facing the cylinder body (1) of the hydraulic cylinder is also connected to at least one suction pipe (10). The other flow channel (15) facing away from the cylinder body (1) of the hydraulic cylinder is also connected to at least one injection pipe (11). The contact ring (13) is fitted with an inner sleeve (7) on its periphery. The inner sleeve (7) is provided with at least one suction channel (8) and at least one injection channel (9). The suction channel (8) and the injection channel (9) both extend along the axial direction of the inner sleeve (7) and pass through one end of the inner sleeve (7) facing away from the cylinder (1). The suction channel (8) is used to connect the guide channel (15) and the suction pipe (10), and the injection channel (9) is used to connect the guide channel (15) and the injection pipe (11).

2. The pollution prevention system for a hydraulic system in a fully mechanized mining face as described in claim 1, characterized in that: The suction channel (8) and the guide channel (15) are connected by a connecting pipe (12), and the injection channel (9) and the guide channel (15) are connected by a connecting hole (16) for accommodating the connecting pipe (12).

3. The pollution prevention system for a hydraulic system in a fully mechanized mining face as described in claim 2, characterized in that: The connecting pipe (12) includes a pipe body (17), and both ends of the pipe body (17) are provided with sealing rings (20), and the outer diameter of the sealing rings (20) is larger than the outer diameter of the pipe body (17).

4. The pollution prevention system for a hydraulic system in a fully mechanized mining face as described in claim 3, characterized in that: An annular slot is provided on the outer wall of each end of the tube (17), and a positioning ring (18) is provided in the slot. The positioning ring (18) extends out of the slot and is fixedly connected to the sealing ring (20) through the connecting sleeve (19).

5. The pollution prevention system for a hydraulic system in a fully mechanized mining face as described in claim 1, characterized in that: The inner sleeve (7) is detachably connected to the outer sleeve (5) on its peripheral sidewall. The outer sleeve (5) is fitted onto the cylinder body (1) and fixed by a fastening assembly.

6. The pollution prevention system for a hydraulic system in a fully mechanized mining face as described in claim 5, characterized in that: The fastening assembly includes a hoop (3) that is coaxially fixedly connected to the outer sleeve (5), and a fastening ring (4) is detachably connected to the outer wall of the hoop (3).

7. The pollution prevention system for a hydraulic system in a fully mechanized mining face as described in claim 1, characterized in that: The system also includes an airflow device, which includes a housing (21) connected to two air ducts (24). One air duct (24) is connected to all the jet pipes (11) and has an exhaust fan (25) inside. The other air duct (24) is connected to all the suction pipes (10) and has an intake fan (30) inside. A filter assembly is detachably installed inside the housing (21) and is located between the two air ducts (24).

8. The pollution prevention system for a hydraulic system in a fully mechanized mining face as described in claim 7, characterized in that: The filter assembly includes a frame (26) and a filter screen (23) fixedly installed inside the frame (26). A disassembly groove is provided on the side wall of the box (21). After the frame (26) extends out of the disassembly groove, a connecting plate (27) is fixedly connected. The connecting plate (27) is detachably connected to the box (21).

9. A method for preventing contamination in a hydraulic system for a fully mechanized mining face, based on the contamination prevention system for a hydraulic system for a fully mechanized mining face as described in claim 1, characterized in that: The method includes the following steps: S1. Deploy the system and install the anti-pollution device on the hydraulic cylinder accordingly; S2. During the extension of the plunger (2) of the hydraulic cylinder, the suction pipe (10) forms a negative pressure in the guide channel (15) to draw away the seeping emulsion. S3. During the retraction of the plunger (2) of the hydraulic cylinder, the injection pipe (11) forms a positive pressure environment in the guide channel (15) to blow away the impurities attached to the plunger (2).

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