Water pressure balance type telescopic part lubricating structure

Abstract

A water pressure balance type telescopic part lubricating structure comprises a cutting head shaft and a cutting arm bearing frame which are coaxially installed in a matched mode, a water jacket is installed between the cutting arm bearing frame and the cutting head shaft, and the cutting head shaft can rotate relative to the water jacket and the cutting arm bearing frame. The cutting head has the positive effects that the cooling water hole for spraying and cooling is also formed in the cutting head shaft, and the cooling water hole is communicated with the water passing hole so as to realize spraying and cooling of the position of the cutting head. Wherein the reliable multi-sealing structure can ensure that the inner spray can work normally, a multi-point lubricating structure and a pressure balance principle are adopted, oil and water pressure on the two sides of the rotary seal are balanced, a water jacket and an inner spray sealing piece work in a pressure balance state, the sealing reliability is greatly improved, and the service life is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting head lubrication structures, in particular to a water pressure balanced telescopic part lubrication structure. Background Art

[0002] During the construction of coal mine roadway driving, the internal spray of the cutting head of the roadheader can play the roles of suppressing dust, diluting gas, and cooling the pick. It can not only prevent pneumoconiosis, but also prevent sparks generated by cutting, and improve the service life of the pick. However, for a long time, the internal spray system of the roadheader cannot be correctly used in actual production. The core problem that troubles the normal use of the internal spray is that the sealing system is unreliable. Often, due to the failure of the seal, the spray water enters the cutting arm lubrication system, which in turn leads to lubrication failure and equipment damage, affecting the overall driving production. Content of the Utility Model

[0003] The purpose of the utility model is to provide a water pressure balanced telescopic part lubrication structure, in which an oil lubrication path and a spray water path are provided in the cutting head shaft and the water jacket and are separated from each other. The two sides of the rotary seal bear the same water pressure and oil pressure respectively, forming a reliable seal, and solving the problems in the prior art.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows: A water pressure balanced telescopic part lubrication structure includes a cutting head shaft and a cutting arm bearing bracket that are coaxially and cooperatively installed. A water jacket is installed between the cutting arm bearing bracket and the cutting head shaft. The cutting head shaft can rotate relative to the water jacket and the cutting arm bearing bracket. An oil injection pipeline and a water injection pipeline are provided in the cutting arm bearing bracket. An oil passing hole communicating with the oil injection pipeline and a water passing hole communicating with the water injection pipeline are provided on the water jacket. A number of circumferentially arranged rotary seals are installed on the cutting head shaft. The oil passing hole communicates with one side surface of the rotary seal, and the water passing hole communicates with the other side surface of the rotary seal. The water pressure and oil pressure on both sides of the rotary seal are balanced. An axially arranged water pipe is provided in the cutting head shaft. One end of the water pipe is provided with a water collecting hole communicating with it, and the water collecting hole communicates with the water passing hole. The water collecting hole is distributed radially along the cutting head shaft. The other end of the water pipe is provided with a cooling water hole communicating with it, and the cooling water hole is located at the end of the cutting head shaft. A first sealing ring is provided on the outer periphery of the rotary seal. There are two rows of circumferentially arranged oil passing holes in the water jacket. A connecting pipeline is provided between the corresponding oil passing holes, and the connecting pipeline is arranged axially along the water jacket. The oil passing holes and the water passing holes are both arranged radially along the water jacket. A second sealing ring is installed on the outer periphery of the water jacket, and the second sealing ring is located between the oil passing holes and the water passing holes. A locking pin is installed between the cutting arm bearing bracket and the water jacket. The cutting arm bearing bracket and the water jacket can move axially synchronously, and the cutting head shaft can rotate relative to the water jacket and the cutting arm bearing bracket. A ring groove matching with the rotary seal is provided on the outer periphery of the cutting head shaft. An elastic sealing ring is provided on the outer periphery of the rotary seal. A convex block that can be compressed and bent is provided on one side of the elastic sealing ring close to the oil passing hole. The bent convex block can separate the two sides of the oil passing hole and the water passing hole. A spring piece is provided in the convex block. When the convex block is compressed and bent, the spring piece inside it always has a tendency to press the convex block tightly against the inner peripheral wall of the water jacket. A cavity is formed between the compressed and bent convex block and the elastic sealing ring, and the cavity communicates with the water passing hole. A number of circumferentially arranged pressing blocks are provided on the upper side of the ring groove, and the pressing blocks extend into the cavity to limit the elastic sealing ring. The thickness of the elastic sealing ring is greater than the thickness of the rotary seal.

[0005] The positive effects of the present utility model are as follows: A hydraulic pressure balanced telescopic part lubrication structure described in the present utility model is composed of a cutting head shaft, a cutting arm bearing bracket, and a water jacket that are coaxially fitted. An oil injection pipeline and a water injection pipeline are provided inside the cutting arm bearing bracket. An oil passing hole communicating with the oil injection pipeline and a water passing hole communicating with the water injection pipeline are provided inside the water jacket. A rotary seal is provided on the outer periphery of the cutting head shaft, and both sides of the rotary seal are respectively communicated with the oil passing hole and the water passing hole to form a water and oil pressure balance on both sides. A cooling water hole for spray cooling is also provided inside the cutting head shaft, and the cooling water hole is communicated with the water passing hole to realize water spraying and cooling of the cutting head position. Among them, a reliable multi-channel sealing structure can ensure the normal operation of the internal spray. The multi-point lubrication structure and the pressure balance principle are adopted to make the oil and water pressures on both sides of the rotary seal balanced, and the water jacket and the internal spray seal work under the pressure balance state, greatly improving the sealing reliability and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0007] Figure 2 is the front view of the present utility model;

[0008] Figure 3 is Figure 2 the right view of

[0009] Figure 4 is the half-sectional view of the present utility model;

[0010] Figure 5 is the structural schematic diagram of the oil injection pipeline opened inside the cutting arm bearing bracket;

[0011] Figure 6 is the structural schematic diagram of the water injection pipeline opened inside the cutting arm bearing bracket;

[0012] Figure 7 is the structural schematic diagram of the water jacket;

[0013] Figure 8 is the half-sectional structural schematic diagram of the water jacket;

[0014] Figure 9 is the structural schematic diagram of the cutting head shaft;

[0015] Figure 10 is Figure 2 the enlarged view of the A-A cross-sectional view in

[0016] Figure 11 is Figure 2 the enlarged view of the B-B cross-sectional view in

[0017] Figure 12 is the structural schematic diagram of the elastic sealing ring provided on the rotary seal;

[0018] Figure 13 It is a schematic diagram of the installation of the present utility model inside the cutting head. Specific embodiments

[0019] A hydraulic pressure balanced telescopic part lubrication structure according to the present utility model, as Figure 1-4 shown, includes a cutting head shaft 1 and a cutting arm bearing bracket 2 which are coaxially and cooperatively installed. A water jacket 3 is installed between the cutting arm bearing bracket 2 and the cutting head shaft 1. The cutting head shaft 1 can rotate relative to the water jacket 3 and the cutting arm bearing bracket 2. The front end of the cutting head shaft 1 can install a cutting head body through a spline sleeve, and the cutting arm bearing bracket 2 is used to connect the telescopic mechanism on the frame, so as to realize the telescopic and rotational movements of the cutting head body.

[0020] To achieve the lubrication of the internal structure of the cutting head and the water spraying and cooling at the end position of the cutting head, as Figure 5 and Figure 6 shown, an oil injection pipeline 4 and a water injection pipeline 5 are opened in the cutting arm bearing bracket 2. As Figure 7 and Figure 8 shown, an oil passing hole 6 communicating with the oil injection pipeline 4 and a water passing hole 7 communicating with the water injection pipeline 5 are opened on the water jacket 3. Among them, the oil passing hole 6 and the water passing hole 7 can be circumferentially arranged in the water jacket 3 and are arranged along the radial direction of the water jacket 3. The oil outlet of the oil injection pipeline 4 and the water outlet of the water injection pipeline 5 both form annular grooves on the inner peripheral wall of the cutting arm bearing bracket 2, respectively realizing the communication with each circumferentially arranged oil passing hole 6 and water passing hole 7.

[0021] As Figure 9 shown, a plurality of circumferentially arranged rotary seals 8 are installed on the cutting head shaft 1. The oil passing hole 6 is communicated with one side surface of the rotary seal 8, and the water passing hole 7 is communicated with the other side surface of the rotary seal 8. The water pressure and oil pressure on both sides of the rotary seal 8 are balanced. Multi-point lubrication of the rotary seal 8 is realized through a plurality of oil passing holes 6, and the spray water pressure and lubricating oil pressure borne on both sides of the rotary seal 8 are equal, enabling the rotary seal 8 to work under a pressure balanced state, greatly improving the sealing reliability and service life.

[0022] To achieve the water spraying and cooling of the end of the cutting head, a water pipe passage 9 arranged axially is opened in the cutting head shaft 1. One end of the water pipe passage 9 is provided with a water collecting hole 10 which is communicated with the water passing hole 7. The water collecting hole 10 is distributed along the radial direction of the cutting head shaft 1. The other end of the water pipe passage 9 is provided with a cooling water hole 11 which is located at the end of the cutting head shaft 1.

[0023] As Figure 10The following is a schematic diagram of the oil circuit between the cutting head shaft 1, the cutting arm bearing bracket 2 and the water jacket 3. When lubricating oil enters the oil injection pipeline 4, it enters each oil passage hole 6 through the annular groove between the cutting arm bearing bracket 2 and the water jacket 3, and enters one side of the rotary seal 8 through multiple oil passage holes 6, playing a corresponding lubricating role.

[0024] As Figure 11 The following is a schematic diagram of the water circuit between the cutting head shaft 1, the cutting arm bearing bracket 2 and the water jacket 3. When cooling water enters the water injection pipeline 5, it enters each water passage hole 7 through the annular groove between the cutting arm bearing bracket 2 and the water jacket 3, and enters the side of the rotary seal 8 between the water jacket 3 and the cutting head shaft 1 through multiple water passage holes 7, and maintains the water pressure equal to the oil pressure on the other side of the rotary seal 8, enabling the rotary seal 8 to work in a balanced state with the same pressure on both sides, avoiding the bearing damage failure caused by the mixing of cooling water into the cutting arm lubrication system. Then, the cooling water enters the water pipe 9 inside the cutting head shaft 1 through the water collecting hole 10, and is discharged through the cooling water hole 11 at the other end of the water pipe 9, realizing the spray cooling of the cutting head end.

[0025] To further improve the water and oil tightness on both sides of the rotary seal 8, a first sealing ring 12 is provided on the outer periphery of the rotary seal 8. To achieve lubricating oil injection for multiple rotary seals 8, as Figure 8 shown, two rows of circumferentially arranged oil passage holes 6 are provided in the water jacket 3. Connecting pipelines 13 are provided between the corresponding oil passage holes 6. The connecting pipelines 13 are arranged along the axial direction of the water jacket 3. The oil passage holes 6 and the water passage holes 7 are both arranged along the radial direction of the water jacket 3. Under the action of the connecting pipelines 13, the lubricating oil between multiple rotary seals 8 can be interconnected.

[0026] Furthermore, to achieve the water and oil seal isolation between different annular grooves of the cutting arm bearing bracket 2 and the water jacket 3, a second sealing ring 14 is installed on the outer periphery of the water jacket 3, and the second sealing ring 14 is located between the oil passage holes 6 and the water passage holes 7.

[0027] Furthermore, to achieve the fixed connection between the cutting arm bearing bracket 2 and the water jacket 3, a locking pin 20 is installed between the cutting arm bearing bracket 2 and the water jacket 3. The setting of the locking pin 20 allows the cutting arm bearing bracket 2 and the water jacket 3 to move axially synchronously, and the cutting head shaft 1 can rotate relative to the water jacket 3 and the cutting arm bearing bracket 2.

[0028] The lubricating oil pressure on one side of the rotary seal 8 is maintained within the required range, and the water pressure on the other side needs to be balanced with the oil pressure. After the lubricating oil is injected, it is all retained between the water jacket 3 and the cutting head shaft 1. After the cooling water is injected, a part of it needs to be discharged as spray water to achieve the cooling effect. The discharge of the cooling water is controlled by a switching valve. At the moment of starting and stopping, the water pressure on one side of the rotary seal 8 will increase, and the unbalanced pressure state will affect the service life of the rotary seal 8 and even allow the cooling water to enter the lubricating oil and affect the overall lubrication effect.

[0029] To solve the above problems, even when the water pressure on the cooling water side increases instantaneously, the sealing isolation of water and oil on both sides of the rotary seal 8 can still be maintained. As Figure 12 shown, a ring groove 15 matching the rotary seal 8 is provided on the outer periphery of the cutting head shaft 1. An elastic sealing ring 16 is provided on the outer periphery of the rotary seal 8. A convex block 17 that can be compressed and bent is provided on one side of the elastic sealing ring 16 close to the oil passage hole 6. The bent convex block 17 can separate both sides of the oil passage hole 6 and the water passage hole 7. With the above structure, when the water pressure on the cooling water side increases, the convex block 17 will be squeezed towards the inner peripheral wall of the water jacket 3, making the elastic sealing ring 16 and the water jacket 3 fit more tightly, ensuring the sealing isolation of water and oil on both sides of the rotary seal 8.

[0030] Furthermore, in order to enhance the elastic performance and deformation range of the convex block 17 itself, a spring piece 18 is provided inside the convex block 17. After the convex block 17 is compressed and bent, the spring piece 18 inside it always has a tendency to push the convex block 17 tightly against the inner peripheral wall of the water jacket 3.

[0031] Furthermore, in order to prevent the elastic sealing ring 16 from tilting towards the lubricating oil side due to the increase in the cooling water pressure, a number of pressing blocks 19 arranged in a circle are provided on the upper side of the ring groove 15. A cavity is formed between the compressed and bent convex block 17 and the elastic sealing ring 16, and the cavity is communicated with the water passage hole 7. The pressing blocks 19 extend into the cavity to form a limit for the elastic sealing ring 16, which can prevent the elastic sealing ring 16 from tilting under the state of unbalanced pressure on both sides. In order to facilitate the installation of the rotary seal 8 into the ring groove 15 with the pressing blocks 19, the thickness of the elastic sealing ring 16 is greater than the thickness of the rotary seal 8. The rotary seal 8 can be smoothly rotated into the ring groove 15. When installed, the elastic sealing ring 16 can compress and deform itself to cross the pressing blocks 19 and then enter the ring groove 15 for installation.

[0032] The water pressure balanced telescopic part lubrication structure described in the present utility model is designed with multiple seals and a separate seal lubricating oil path. Lubricating oil is introduced into the non-water side of the seal. The two sides of the seal bear the pressure of spray water and lubricating oil respectively, and the pressures are equal. The inner spray seal works under the pressure balance state, greatly improving the sealing reliability and service life.

[0033] The technical solution of the present utility model is not limited to the scope of the embodiments described in the present utility model. The technical content not described in detail in the present utility model is well-known technology.

Claims

1. A water pressure balanced telescopic lubrication structure, characterized in that: The invention comprises a cutting head shaft (1) and a cutting arm bearing frame (2) which are coaxially mounted, a water jacket (3) being mounted between the cutting arm bearing frame (2) and the cutting head shaft (1), the cutting head shaft (1) being capable of rotating relative to the water jacket (3) and the cutting arm bearing frame (2), an oil injection pipeline (4) and a water injection pipeline (5) being provided in the cutting arm bearing frame (2), an oil through hole (6) connected to the oil injection pipeline (4) and a water through hole (7) connected to the water injection pipeline (5) being provided on the water jacket (3), a plurality of circumferentially arranged rotary seals (8) being mounted on the cutting head shaft (1), the oil through holes (4) and the water through holes (7) being provided on the cutting head shaft (1) (6) is connected to one side of the rotary seal (8), the water hole (7) is connected to the other side of the rotary seal (8), the water pressure and oil pressure on both sides of the rotary seal (8) are balanced, a water pipeline (9) arranged along the axial direction is opened in the cutting head shaft (1), one end of the water pipeline (9) is provided with a connected water collection hole (10), the water collection hole (10) is connected to the water hole (7), the water collection holes (10) are distributed along the radial direction of the cutting head shaft (1), and the other end of the water pipeline (9) is provided with a connected cooling water hole (11), and the cooling water hole (11) is located at the end of the cutting head shaft (1).

2. A water pressure balanced telescopic lubrication structure according to claim 1, characterized in that: A first sealing ring (12) is provided on the outer periphery of the rotary seal (8); two rows of circumferentially arranged oil holes (6) are provided in the water jacket (3); connecting pipes (13) are provided between the corresponding oil holes (6); the connecting pipes (13) are arranged along the axial direction of the water jacket (3); the oil holes (6) and the water holes (7) are arranged along the radial direction of the water jacket (3); a second sealing ring (14) is installed on the outer periphery of the water jacket (3); the second sealing ring (14) is located between the oil holes (6) and the water holes (7).

3. The water pressure balanced telescopic lubrication structure according to claim 1, characterized in that: A locking pin (20) is installed between the cutting arm bearing frame (2) and the water jacket (3), and the cutting arm bearing frame (2) and the water jacket (3) can move axially synchronously.

4. The water pressure balanced telescopic lubrication structure according to claim 1, characterized in that: The outer circumference of the cutting head shaft (1) is provided with an annular groove (15) which cooperates with the rotary seal (8), the outer circumference of the rotary seal (8) is provided with an elastic sealing ring (16), and a protrusion (17) which can be compressed and bent is provided on one side of the elastic sealing ring (16) close to the oil hole (6), and the protrusion (17) after being bent can separate the two sides of the oil hole (6) and the water hole (7).

5. A water pressure balanced telescopic lubrication structure according to claim 4, characterized in that: The protrusion (17) is provided with a spring sheet (18) therein, and after the protrusion (17) is compressed and bent, the spring sheet (18) therein always has a tendency to press the protrusion (17) against the inner peripheral wall of the water jacket (3).

6. A water pressure balanced telescopic lubrication structure according to claim 4, characterized in that: A cavity is formed between the compressed and bent protrusion (17) and the elastic sealing ring (16), and the cavity is connected to the water through hole (7). A plurality of circumferentially arranged pressing blocks (19) are provided on the upper side of the annular groove (15). The pressing blocks (19) extend into the cavity to limit the elastic sealing ring (16), wherein the thickness of the elastic sealing ring (16) is greater than the thickness of the rotary seal (8).

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