Novel internal spraying water supply device for coal mining machine

Abstract

The invention provides a novel internal spraying water supply device for a coal mining machine, which is arranged in a rocker arm of the coal mining machine, is used for spraying and dust falling in a roller coal mining process, and comprises a water seal seat arranged on an end cover of a rocker arm central gear and a water supply pipe for supplying water to a spraying device arranged on the surface of a roller, the end face of the water seal base is concaved inwards to form a containing cavity and a water inlet pipeline extending from the bottom of the containing cavity to the side wall of the water seal base, the water supply pipe is arranged in the containing cavity and rotatably connected with a connecting section of the water inlet pipeline, and an end face sealing assembly is arranged between the water supply pipe and the outer end face of the water seal base. The end face sealing assembly has an end face sealing effect in the rotating process of the water supply pipe. After the water supply pipe is connected with the connecting section of the water inlet pipeline of the water seal seat, the end face sealing effect is formed in the rotating process of the water supply pipe through the end face sealing assembly arranged at the open end of the water seal seat, the sealing effectiveness is improved, and the structure is simple and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of coal shearers, and particularly relates to an internal spray water supply device for a new type of coal shearer. Background Art

[0002] Dust control in coal mines is one of the key tasks. Excessive dust has a great impact on the working environment. To prevent coal worker pneumoconiosis, the dust content must meet the standard. At the same time, coal dust can also cause safety accidents such as explosions. More than 80% of the coal dust is generated when the coal shearer drum cuts the coal wall. Therefore, Article 636 of the "Coal Mine Safety Regulations" stipulates: "Article 636 Coal shearers must be equipped with internal and external spray devices. During coal cutting, spraying must be carried out to reduce dust. The working pressure of the internal spray shall not be less than 2 MPa, the working pressure of the external spray shall not be less than 4 MPa, and the spray flow rate shall match the machine type. When there is no water or the spray device cannot be used normally, the machine must be stopped."

[0003] The internal spray device of the coal shearer is an important component for realizing dust reduction, extinguishing sparks, and cooling pick teeth on the working face. The cooling water for the internal spray is introduced from one side of the end cover of the fixed rocker arm central gear, passes through the central waterway system of the rocker arm, and is led out from one side of the rotating cutting square head, then connected to the cutting drum, and finally sprayed out by multiple groups of nozzles arranged on the drum. Since the cutting drum rotates during operation, that is, one end of the central water pipe needs to have a rotary seal structure. The failure of the rotary seal will affect the spray water supply pressure, thereby affecting the dust reduction effect of the coal shearer and deteriorating the working environment of the coal mining face. Moreover, the central water pipe needs to pass through the lubricating oil working area of the planetary mechanism of the coal shearer rocker arm. When the rotary seal of the central waterway fails, the spray water will mix with the lubricating oil, resulting in emulsification of the lubricating oil, affecting the normal operation of the planetary mechanism, and even causing failures such as the locking of the planetary mechanism, seriously affecting the normal use of the coal shearer, reducing the coal mining efficiency, and increasing the equipment usage cost.

[0004] At present, most domestic and foreign products adopt soft material sealing units such as GLY seals and rubberized fabric to friction the outer diameter of the water pipe in the relative axial or rotary sealing form. Practice has proved that the existing sealing forms have many defects and cannot meet the requirements of coal mining operations. Summary of the Invention

[0005] The purpose of the present invention is to provide an internal spray water supply device for a new type of coal shearer in view of the deficiencies of the prior art, which uses end face sealing to replace the existing rotary sealing, improves the effectiveness of the sealing, and has a simple and reliable structure.

[0006] The present invention provides an internal spray water supply device for a new type of coal shearer, which is arranged inside the rocker arm of the coal shearer and is used for spraying and dust reduction during drum coal mining. It includes a water seal seat provided on the end cover of the central gear of the rocker arm and a water supply pipe for supplying water to the spray device arranged on the surface of the drum.

[0007] The end face of the water seal seat is recessed inward to form a receiving cavity and a water inlet pipeline extending from the bottom of the receiving cavity to the side wall of the water seal seat. The water supply pipe is arranged in the receiving cavity and is rotatably connected to the connecting section of the water inlet pipeline. An end face sealing assembly is arranged between the water supply pipe and the outer end face of the water seal seat, and the end face sealing assembly forms an end face sealing effect during the rotation of the water supply pipe.

[0008] Preferably, a transmission seat is fixed to the part of the water supply pipe located in the receiving cavity, and the transmission seat rotates synchronously with the water supply pipe.

[0009] The end face sealing assembly includes a stationary ring arranged on the outer end face of the water seal seat and a moving ring arranged on the transmission seat. The moving ring is closely attached to the stationary ring. When the water supply pipe rotates, the moving ring is driven by the transmission seat to rotate, so as to form a sealing end face with the stationary ring.

[0010] Preferably, the transmission seat is L-shaped, and its inner side wall has an installation step. The moving ring is fixed on the installation step, and an elastic member is clamped between the transmission seat and the moving ring to keep the moving ring closely attached to the stationary ring.

[0011] Preferably, a bearing is fixedly arranged on the outer end face of the water seal seat at the stationary ring. The water supply pipe passes through the inner ring of the bearing to support the water supply pipe.

[0012] Preferably, the outer end face of the stationary ring is recessed inward to form a plurality of steps. The outer end face of the outermost step is used to fix the bearing, and an oil seal installation space for arranging an oil seal assembly is formed between the innermost step and the water supply pipe. The oil seal assembly is used to seal the lubricating oil of the planetary mechanism of the rocker arm.

[0013] Preferably, a first installation groove for installing a Gleitring is arranged on the inner side wall of the stationary ring close to the water supply pipe. The first installation groove is located between the sealing end face and the oil seal assembly to enable the Gleitring to isolate water and oil.

[0014] Preferably, a second installation groove for installing a sealing ring is arranged on the inner side wall of the moving ring closely attached to the water supply pipe to seal the water supply pipe; and / or,

[0015] A water seal assembly is arranged on the side surface of one end of the water supply pipe close to the water inlet pipeline to seal the water supply pipe.

[0016] Preferably, a drainage channel penetrates through one side of the water seal seat. The drainage channel extends from the sealing end face to penetrate through the bottom of the water seal seat to discharge leaked water or oil.

[0017] Preferably, an oil cup and a retaining ring are provided in a region of the drainage channel close to the bottom surface of the water seal seat. The retaining ring makes the oil cup abut against and seal the drainage channel. When water leaks or oil is discharged, the oil cup is pushed against to compress the retaining ring, thereby opening the drainage channel.

[0018] Preferably, a tungsten carbide metal coating is sprayed on the surface of the water supply pipe by thermal spraying; and / or,

[0019] The bottom of the water seal seat is recessed inward to form an inspection hole, which is connected to the water inlet pipeline. A plug is detachably provided in the inspection hole.

[0020] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred examples of the present invention.

[0021] The positive and progressive effects of the present invention are as follows:

[0022] According to the new internal spray water supply device for a shearer involved in the present invention, after the connection section of the water supply pipe and the water inlet pipeline of the water seal seat are connected, by providing an end face seal assembly at the open end of the accommodation cavity of the water seal seat, an end face sealing effect is ensured during the rotation of the water supply pipe, improving the effectiveness of the seal, and the structure is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the new internal spray water supply device for a shearer in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described below with reference to the embodiments shown in the drawings.

[0025] <Embodiment>

[0026] As shown in the attached Figure 1 figure, this embodiment discloses a new internal spray water supply device 100 for a shearer, which is arranged inside the rocker arm of the shearer (not shown in the figure) and is used for spray dust reduction during drum coal mining. It includes: a water seal seat 10, a water supply pipe 20, and an end face seal assembly 30.

[0027] The water seal seat 10 is fixed to the end cover 200 of the central gear of the rocker arm by screws 11 and washers 12. The water supply pipe 20 is connected inside the water seal seat 10 and is used to supply water to the spray device arranged on the surface of the drum; therefore, the water supply pipe 20 needs to rotate synchronously with the drum.

[0028] Specifically, the end face of the water seal seat 10 is recessed inward to form a receiving cavity 13 and a water inlet pipeline 14 extending from the bottom of the receiving cavity 13 to the side wall of the water seal seat 10. The water inlet pipeline 14 penetrates through the side wall of the water seal seat 10, facilitating the connection to a water source through an external water supply device. To prevent the external water source from leaking from the interface and entering the lubricating oil working area, mounting grooves are respectively provided on both sides of the interface between the water inlet pipeline 14 and the external water supply device for mounting an O-ring 15 to seal water leakage.

[0029] The water supply pipe 20 is disposed in the receiving cavity 13 and is rotatably connected to the connecting section 141 of the water inlet pipeline 14, and water supply is achieved along the Figure 1 arrow direction shown. The water supply pipe 20 is an integrally formed structure, and there may be water leakage caused by wear, etc. only at the connection with the water inlet pipeline 14 due to rotation requirements. Additionally, in practical applications, a tungsten carbide metal coating can be sprayed on the surface of the water supply pipe 20 by thermal spraying to improve its wear resistance, thereby enhancing the reliability of the seal during rotation.

[0030] The end face seal assembly 30 is disposed between the outer end face of the water seal seat 10 and the water supply pipe 20, and an end face sealing effect is formed by the end face seal assembly 30 during the rotation of the water supply pipe 20.

[0031] According to the new type of internal spray water supply device 100 for a shearer involved in this embodiment, after the water supply pipe 20 is connected to the connecting section 141 of the water inlet pipeline 14 of the water seal seat 10, by providing an end face seal assembly 30 at the open end of the receiving cavity 13 of the water seal seat 10, an end face sealing effect is ensured during the rotation of the water supply pipe 20, improving the effectiveness of the seal, and the structure is simple and reliable.

[0032] In a specific embodiment, a transmission seat 21 is fixed to the part of the water supply pipe 20 in the receiving cavity 13 by screws 22, and the transmission seat 21 can rotate synchronously with the water supply pipe 20.

[0033] The end face seal assembly 30 includes a stationary ring 31 disposed on the outer end face of the water seal seat 10 and a moving ring 32 disposed on the transmission seat 21. The stationary ring 31 is fixedly connected to the water seal seat 10 through a clamping groove, and the moving ring 32 is closely arranged with the stationary ring 31. When the water supply pipe 20 rotates, the moving ring 32 is driven by the transmission seat 21 to rotate, thereby forming a sealing end face 33 with the stationary ring 31.

[0034] Specifically, the transmission seat 21 is L-shaped, and its inner side wall has a mounting step. The moving ring 32 is fixed on the mounting step, and can be specifically fixed on the side wall of the transmission seat 21 by a key connection method (i.e., the key 211 in the figure). Moreover, an elastic member 34 is clamped between the transmission seat 21 and the moving ring 32, so that the moving ring 32 is kept in close contact with the static ring 31, preventing gaps from appearing between the moving ring 32 and the static ring 31 due to rotational wear and resulting in water leakage, and improving the effectiveness and reliability of the end face seal.

[0035] In a specific embodiment, a bearing 16 is fixedly provided on the outer end face of the static ring 31 of the water seal seat 10, and the water supply pipe 20 passes through the inner ring of the bearing 16, thereby supporting the water supply pipe 20.

[0036] Specifically, a plurality of steps 311 are formed by inward depression on the outer end face of the static ring 31. The outer end face of the outermost step 311 is used to fix the bearing 16, and an oil seal installation space for arranging the oil seal assembly 40 is formed between the innermost step 311 and the water supply pipe 20. The oil seal assembly 40 is used to seal the lubricating oil of the planetary mechanism of the rocker arm.

[0037] In a specific embodiment, a first installation groove for installing the Gleason ring 34 may also be provided on the inner side wall of the static ring 31 close to the water supply pipe 20. The first installation groove is located between the sealing end face and the oil seal assembly 40 so that the Gleason ring 34 can isolate water and oil (i.e., lubricating oil).

[0038] In a specific embodiment, a second installation groove for installing the sealing ring 35 is provided on the inner side wall of the moving ring 32 in close contact with the water supply pipe 20. The sealing ring 35 is an O-ring and is used to further seal the water supply pipe 20 and the water seal seat 10.

[0039] In a specific embodiment, a water seal assembly 50 is provided on the side surface of one end of the water supply pipe 20 close to the water inlet pipe 14, which plays a first sealing role between the water supply pipe 20 and the water seal seat 10.

[0040] In addition, since the bearing 16 is placed in the lubricating oil of the rocker arm planetary mechanism, a third installation groove for installing the sealing ring 36 can be provided on the outer side of the static ring 31. The sealing ring 36 is an O-ring and is used to seal the lubricating oil.

[0041] In a specific embodiment, a drainage channel 17 penetrates through one side of the water seal seat 10. The drainage channel 17 extends from the position of the sealing end face 33 to the bottom of the water seal seat 10 to drain leaked water or oil.

[0042] Preferably, an oil cup 171 and a retaining ring 172 are provided in a region of the drainage channel 17 close to the bottom surface of the water seal seat 10. The retaining ring 172 makes the oil cup 171 abut against and seal the drainage channel 17. When water or oil leaks or is discharged, the oil cup 172 is pushed against by the pressure of the water or oil in the drainage channel 17 to compress the retaining ring 172, thereby opening the drainage channel 17 and discharging the water or oil. In this way, it is convenient to quickly observe or detect the water leakage situation. Moreover, due to the harsh working environment of the shearer and a large amount of dust, the drainage channel 17 can be prevented from being blocked by dust and the like by providing the oil cup 171 and the retaining ring 172.

[0043] In a specific embodiment, a maintenance hole 18 is recessed inwardly at the bottom of the water seal seat 10. The maintenance hole 18 is communicated with the water inlet pipeline 14. In the normal working state, a plug 19 is detachably provided in the maintenance hole 18. Only during maintenance, the connection components between the water supply pipe 20 and the water seal seat 10 can be maintained by opening the plug 19.

[0044] The protection scope of the present invention is not limited to the above embodiments. Obviously, those skilled in the art can make various changes and deformations to the present invention without departing from the scope and spirit of the present invention. If these changes and deformations belong to the scope of the claims of the present invention and its equivalent technologies, the intention of the present invention also includes these changes and deformations.

Claims

1. A new type of internal spray water supply device for a shearer, which is arranged inside the rocker arm of the shearer and is used for spray dust reduction during drum coal mining. It includes a water seal seat arranged on the end cover of the central gear of the rocker arm and a water supply pipe for supplying water to the spray device arranged on the surface of the drum. It is characterized in that, a receiving cavity is formed by the inward depression of the end face of the water seal seat, and a water inlet pipeline extends from the bottom of the receiving cavity to the side wall of the water seal seat. The water supply pipe is arranged in the receiving cavity and is rotatably connected to the connecting section of the water inlet pipeline. An end face sealing assembly is arranged between the outer end face of the water supply pipe and the water seal seat, and the end face sealing assembly forms an end face sealing effect during the rotation of the water supply pipe.

2. The new type of internal spray water supply device for a shearer according to claim 1, characterized in that: a transmission seat is fixed to the part of the water supply pipe located in the receiving cavity, and the transmission seat rotates synchronously with the water supply pipe, the end face sealing assembly includes a stationary ring arranged on the outer end face of the water seal seat and a moving ring arranged on the transmission seat. The moving ring is closely attached to the stationary ring. When the water supply pipe rotates, the moving ring is driven by the transmission seat to rotate, so as to form a sealing end face with the stationary ring.

3. The new type of internal spray water supply device for a shearer according to claim 2, characterized in that: the transmission seat is L-shaped, and its inner side wall has an installation step. The moving ring is fixed on the installation step, and an elastic member is clamped between the transmission seat and the moving ring to keep the moving ring closely attached to the stationary ring.

4. The new type of internal spray water supply device for a shearer according to claim 2, characterized in that: a bearing is fixedly arranged on the outer end face of the water seal seat where the stationary ring is located, and the water supply pipe passes through the inner ring of the bearing to support the water supply pipe.

5. The new type of internal spray water supply device for a shearer according to claim 4, characterized in that: multiple steps are formed by the inward depression of the outer end face of the stationary ring. The outer end face of the outermost step is used to fix the bearing, and an oil seal installation space for arranging an oil seal assembly is formed between the innermost step and the water supply pipe. The oil seal assembly is used to seal the lubricating oil of the planetary mechanism of the rocker arm.

6. The new type of internal spray water supply device for a shearer according to claim 5, characterized in that: a first installation groove for installing a Gleitring is arranged on the inner side wall of the stationary ring close to the water supply pipe. The first installation groove is located between the sealing end face and the oil seal assembly so that the Gleitring can isolate water and oil.

7. The new type of internal spray water supply device for a shearer according to claim 2, characterized in that: a second installation groove for installing a sealing ring is arranged on the inner side wall of the moving ring closely attached to the water supply pipe to seal the water supply pipe; and / or, a water seal assembly is arranged on the side surface of one end of the water supply pipe close to the water inlet pipeline to seal the water supply pipe.

8. The new type of internal spray water supply device for a shearer according to claim 1, characterized in that: a drainage channel is arranged through one side of the water seal seat. The drainage channel extends from the sealing end face to penetrate the bottom of the water seal seat to discharge leaked water or oil.

9. The novel internal spray water supply device for a coal shearer according to claim 1, characterized in that: An oil cup and a retaining ring are provided in a region of the drainage channel close to the bottom surface of the water seal seat. The retaining ring makes the oil cup abut against and seal the drainage channel. When water leaks or oil is discharged, the oil cup is pushed against to compress the retaining ring, thereby opening the drainage channel.

10. The novel internal spray water supply device for a coal shearer according to claim 1, characterized in that: A tungsten carbide metal coating is sprayed on the surface of the water supply pipe by thermal spraying; and / or, A repair hole is recessed inward at the bottom of the water seal seat. The repair hole is communicated with the water inlet pipeline, and a plug is detachably provided in the repair hole.

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