Combined vibration damper for coal mining machine

Abstract

The invention provides a combined type coal mining machine vibration reduction device which is arranged on a machine body of a coal mining machine and used for conducting vibration reduction on a rocker arm of the coal mining machine. The vibration damping device comprises a support connected with a base of the height adjusting oil cylinder, a supporting rod extending from the support to the direction of a coal mining machine body, a disc spring vibration damper arranged on the supporting rod in a sleeving mode and a vibration damping oil cavity formed in the coal mining machine body, and the disc spring vibration damper is arranged between the support and the machine body in a clamped mode. The other end of the supporting rod is inserted into the vibration reduction oil cavity, and vibration reduction of the rocker arm is achieved through the disc spring vibration damper and vibration reduction oil in the vibration reduction oil cavity. The disc spring shock absorber formed by filling the elastic disc spring with proper rigidity and the rubber in a combined mode is adopted, and supporting and low-strength vibration absorption of the rocker arm are achieved; meanwhile, a supplemental vibration reduction oil cavity is formed in the rear portion, high-strength vibration impact is absorbed, and stability of the rocker arm is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of shearers, and particularly relates to a combined shearer vibration damping device. Background Art

[0002] The shearer, scraper conveyor, and hydraulic support are important three-machine equipment in the fully-mechanized mining face of an underground coal mine. The shearer rides on the scraper conveyor and cuts coal and rock by moving back and forth to achieve coal mining.

[0003] The rocker arm of the shearer is an actuator of the coal mining equipment in the underground working face. It is installed at both ends of the shearer. When the shearer moves back and forth, coal mining is realized. The upper side of the rocker arm is hinged to the fuselage through a pin shaft assembly, and the lower side is connected to the fuselage through a lifting cylinder. When the lifting cylinder expands and contracts, the rocker arm swings up and down to adjust the height, so as to meet the coal mining requirements for different mining heights in the working face. When the shearer moves back and forth and the drum in front of the rocker arm rotates to directly cut coal and rock, when there are many intercalated gangues or the hardness is relatively high in the working face, the rocker arm will generate impact vibration, which will cause fatigue damage to the rocker arm housing and the internal gear transmission system. In severe cases, it will even directly cause the housing to be overloaded and deformed and fail. Therefore, the rocker arm needs to be protected.

[0004] According to the kinetic principle, the design of the vibration damping device mainly realizes the vibration damping of the equipment by adjusting the stiffness and damping of the vibration damping system. The existing protection strategies generally include two types: one is to set a hydraulic solenoid valve and an accumulator inside the lifting cylinder, and realize the vibration damping of the rocker arm by adjusting the internal hydraulic system pressure; the other is to add a mechanical vibration damping device to the lifting system to protect the rocker arm. The former has low compressibility of hydraulic oil, too high system stiffness, and large vibration frequency and intensity when the rocker arm cuts coal and rock, and the sensitivity of the hydraulic system is low, resulting in insufficient vibration damping effect; the latter uses a mechanical vibration damping structure. Although it can adjust the support stiffness to achieve buffering for large vibrations, it is often only equipped with rubber damping materials, and the rebound damping is insufficient, and it cannot effectively absorb impacts and reduce vibrations. Summary of the Invention

[0005] The purpose of the invention is to provide a combined shearer vibration damping device for the deficiencies of the existing technology. A disc spring shock absorber formed by combining an elastic disc spring and rubber with appropriate stiffness is used to support the rocker arm and absorb low-intensity vibrations; at the same time, a replenishable vibration damping oil cavity is arranged at the rear to absorb high-intensity vibration impacts and ensure the stability of the rocker arm.

[0006] The invention provides a combined shearer vibration damping device, which is arranged on the fuselage of the shearer and is used for damping the rocker arm of the shearer. The vibration damping device includes a support connected to the base of the lifting cylinder, a support rod extending from the support towards the fuselage of the shearer, a disc spring shock absorber sleeved on the support rod, and a vibration damping oil cavity arranged on the fuselage of the shearer.

[0007] The disc spring shock absorber is clamped between the support and the fuselage. The other end of the support rod is inserted into the shock-absorbing oil cavity, and the shock absorption of the rocker arm is achieved through the disc spring shock absorber and the shock-absorbing oil in the shock-absorbing oil cavity.

[0008] Preferably, the support includes a main body portion fixedly connected to the support rod, and connecting portions extending from both ends of the main body portion in the opposite direction of the support rod. Through holes are respectively provided through the connecting portions, and the base of the height-adjusting oil cylinder is arranged between the two connecting portions. The support and the height-adjusting oil cylinder are hinged to each other by sequentially passing a connecting pin through the connecting portion and the base of the height-adjusting oil cylinder.

[0009] Preferably, the support rod is connected to the central position of the main body portion.

[0010] Preferably, a chute is provided on the fuselage of the shearer, and the support can be movably arranged in the chute.

[0011] Preferably, the chute includes a first sliding section for the main body portion to slide and a second sliding section for the support rod to slide. The disc spring shock absorber is clamped between the main body portion and the bottom wall of the second sliding section.

[0012] Preferably, the width of the first sliding section is greater than the width of the second sliding section and the width of the first sliding section covers the width of the second sliding section to limit the moving stroke of the support.

[0013] Preferably, the shock absorption device further includes a guard plate, and the guard plate covers the chute.

[0014] Preferably, the guard plate is connected to the side wall of the second sliding section.

[0015] Preferably, a third sliding section is further extended on the bottom wall of the second sliding section, and the width of the third sliding section is matched with the support rod. The shock-absorbing oil cavity is arranged on the bottom wall of the third sliding section.

[0016] Preferably, a shock-absorbing oil sealing element is provided on the side wall of the end of the support rod close to the shock-absorbing oil cavity, and the shock-absorbing oil sealing element is closely attached to the side wall of the third sliding section.

[0017] Preferably, an annular groove is provided on the axial surface of the support rod, and the shock-absorbing oil sealing element is embedded in the annular groove.

[0018] Preferably, the shock-absorbing oil cavity is further provided with an oil injection nozzle, and the oil injection nozzle penetrates through the bottom wall of the third sliding section to inject shock-absorbing oil into the shock-absorbing oil cavity from the outside.

[0019] On the basis of conforming to the common knowledge in the art, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred examples of the present invention.

[0020] The positive and progressive effects of the present invention are as follows:

[0021] According to the combined shearer vibration damping device involved in the present invention, a connected support is arranged on the base of the lifting cylinder of the shearer rocker arm. A support rod extending towards the shearer body direction is arranged on the support. A disc spring shock absorber is sleeved on the support rod and clamped between the support and the shearer body. The disc spring shock absorber is formed by combining and filling an elastic disc spring with appropriate stiffness and rubber, so as to realize the support of the rocker arm and the absorption of low-intensity vibration. In addition, a shock-absorbing oil cavity is arranged at the other end of the support rod to realize the absorption of high-intensity vibration impact, thus ensuring the stability of the rocker arm. That is, the vibration damping of the rocker arm is realized through the combination of the disc spring shock absorber and the damping oil in the shock-absorbing oil cavity, and at the same time, the vibration damping requirements under low-intensity and high-intensity vibrations are met, with wide applicability.

[0022] In addition, the combined shearer vibration damping device of the present invention has a simple structure and is convenient to install. It only needs to be installed between the lifting cylinder and the shearer body without modifying other components. Different disc spring shock absorbers and damping oils can be flexibly configured to adapt to different types of rocker arm devices, such as selecting disc spring shock absorbers with different stiffnesses or damping oils with different damping, so as to realize combined shearer vibration damping devices with different requirements. Description of the Drawings

[0023] Figure 1 is a partial schematic diagram of the shearer rocker arm and the body in the embodiment of the present invention.

[0024] Figure 2 is Figure 1 a partial enlarged view of the combined shearer vibration damping device in

[0025] Figure 3 is Figure 2 a sectional view of the combined shearer vibration damping device along the B1-B1 direction of

[0026] Figure 4 is a schematic diagram of the structure of the support in the embodiment of the present invention.

[0027] Figure 5 is Figure 4 a sectional view along the B3-B3 direction of

[0028] Figure 6 is a schematic diagram of the structure of the disc spring shock absorber in the embodiment of the present invention.

[0029] Figure 7 is Figure 2 a partial enlarged view of the shearer body in Detailed Embodiments

[0030] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments described herein.

[0031] <Embodiment>

[0032] As Figures 1 to 3 shown, this embodiment provides a combined vibration damping device 100 for a shearer, which is arranged on the body 200 of the shearer and is used to damp the lifting cylinder 310 of the shearer boom 300. As Figure 2 and Figure 3 shown, the vibration damping device 100 includes a support 10, a support rod 20, a disc spring damper 30 and a vibration damping oil chamber 40.

[0033] As Figure 3 shown, the support 10 is connected to the base 311 of the lifting cylinder 310. The support rod 20 is fixed on the surface of the support 10 and extends towards the body 200 of the shearer. The disc spring damper 30 is sleeved on the support rod 20 and is clamped between the support 10 and the body 200. During the vibration damping process, due to the displacement of the support 10, the disc spring damper 30 is compressed to absorb low-intensity vibration shocks, thereby achieving vibration damping. The vibration damping oil chamber 40 is arranged on the body 200 of the shearer, and one end of the support rod 20 away from the support 10 is inserted into the vibration damping oil chamber 40, and the vibration damping oil in the vibration damping oil chamber 40 is used to absorb high-intensity vibration shocks.

[0034] As Figure 4 and Figure 5 shown, the support 10 includes a main body portion 11 and two connecting portions 12. Specifically, the main body portion 10 is fixedly connected to the support rod 20, and the two connecting portions 12 respectively extend from both ends of the main body portion 11 in the opposite direction of the support rod 20, so as to form an accommodating space between the two connecting portions 12 for accommodating the base 311 of the lifting cylinder 310. And through holes 13 are respectively provided through the two connecting portions 12. In this way, by sequentially passing a connecting pin through the connecting portion 12 and the base 311 of the lifting cylinder 310, the support 10 and the lifting cylinder 310 can be hinged, thereby damping the boom 300 and playing a role in stabilizing the boom.

[0035] In a preferred manner, the support rod 20 is connected to the central position of the main body portion 11, and the support 10 and the support rod 20 are integrally formed structures, so as to ensure their connection strength and vibration damping effect.

[0036] As Figure 3 and Figure 6As shown, the disc spring shock absorber 30 is annular and sleeved on the support rod 20. Specifically, it is composed of elastic disc springs 31 with appropriate stiffness and rubber 32 filled between the elastic disc springs 31, so that it has a certain stiffness and damping and can change with the vibration and telescoping of the rocker arm 300. Therefore, when the vibration intensity of the shearer rocker arm is relatively low, the support 10 moves with the disc spring shock absorber 30 to provide buffering and damping for the rocker arm 300.

[0037] In another embodiment, as Figure 7 shown, a chute 210 is provided on the fuselage 200 of the shearer, and the support 10 is movably arranged in the chute 210. Specifically, as Figure 3 and Figure 7 shown, the chute 210 includes a first sliding section 211, a second sliding section 212, and a third sliding section 213. The first sliding section 211 is used for the main body part to slide, and the second sliding section 212 is used for a section area of the support rod 20 sleeved with the disc spring shock absorber 30 to slide. That is to say, the disc spring shock absorber 30 is clamped between the main body part 11 and the bottom wall 214 of the second sliding section 212.

[0038] Preferably, viewed in the up-and-down direction in Figure 3 , the width of the first sliding section 211 is greater than the width of the second sliding section 212, and the width of the first sliding section 211 covers the width of the second sliding section 212. In this way, the end face of the side wall 214 of the second sliding section 212 can limit the moving stroke of the support 10 to improve safety.

[0039] The third sliding section 213 is further penetrated and extended from the bottom wall 215 of the second sliding section 212, and the damping oil chamber 40 is arranged on the bottom wall of the third sliding section 213. Similarly, viewed in the up-and-down direction in Figure 3 , the width of the third sliding section 213 is matched with the diameter of the support rod 20, so as to supply the area where the support rod 20 penetrates the disc spring shock absorber 30 to slide, and the corresponding end of the support rod 20 is inserted into the damping oil chamber 40. The damping oil chamber 40 is filled with damping oil. When the rocker arm vibrates greatly, the damping of the damping system can be increased, and the vibration impact can be converted into heat to absorb the vibration.

[0040] In a preferred manner, a damping oil sealing element 41 is provided on the side wall of one end of the support rod 20 close to the damping oil chamber 40, and the damping oil sealing element 41 is in close fit with the side wall 216 of the third sliding section 213, so as to realize the sealing of the damping oil.

[0041] In another embodiment, an annular groove 21 is provided on the axial surface of the support rod 20, and the damping oil sealing element 41 is embedded in the annular groove 21, so as to realize the positioning and installation of the damping oil sealing element 41 and improve the sealing performance.

[0042] In another embodiment, the damping oil chamber 40 is further provided with an oil injection nozzle 42. The oil injection nozzle 42 penetrates through the bottom wall 217 of the third sliding section 213 and is a one-way oil injection nozzle, so as to realize injecting damping oil into the damping oil chamber 40 from the outside, realize the replenishment of damping oil at any time, and facilitate underground maintenance.

[0043] For another example Figure 3 As shown, the damping device 100 further includes a guard plate 50. The guard plate 50 covers the sliding groove 210, so as to protect the whole damping device 100 in the coal mining environment. Specifically, the guard plate 50 is connected to the side wall 214 of the second sliding section 212 by bolts.

[0044] Based on the above structure, after the shearer applies the combined shearer damping device 100, the support of the boom 300 and the absorption of low-intensity vibration can be realized through the disc spring damper 30; at the same time, through the damping oil in the damping oil chamber 40 arranged behind the disc spring damper 30, the absorption of high-intensity vibration impact can be realized, so as to ensure the stability of the boom 300. That is, the damping of the boom 300 is realized through the combination of the disc spring damper 30 and the damping oil in the damping oil chamber 40, and the damping requirements under low-intensity and high-intensity vibrations are met at the same time, with wide applicability.

[0045] The following describes the damping process in combination with the working process of the shearer:

[0046] In the fully mechanized coal mining face, the shearer rides on the scraper conveyor and can move left and right to realize longwall mining. A pair of symmetric booms are respectively installed at both ends of the shearer. The upper side of the boom is directly hinged to the shearer body through a pin shaft assembly, and the lower side is connected to the body through a height-adjusting oil cylinder. The damping device of this embodiment is added between the height-adjusting oil cylinder and the body to realize the damping protection of the boom.

[0047] When the working face conditions are good and the vibration of the shearer boom is small, the support can move in the sliding groove of the body along with the disc spring damper; the disc spring damper is composed of multiple arranged disc springs and the internally filled rubber, which respectively provide the required buffering and damping for the boom. When there are many intercalated gangues and strong vibrations in the working face, the rubber inside the disc spring damper is not enough to provide the damping required by the system. At this time, the damping oil behind the support comes into play and absorbs the larger vibration impact.

[0048] In summary, the damping device of this embodiment can absorb vibration impacts of different intensities, avoid the boom housing and the internal transmission system from bearing large loads and deformations, and realize the damping protection of the boom.

[0049] This damping device can also slow down and isolate the vibration from the boom, reduce the vibration impact on the shearer body, and protect the key components of the body.

[0050] This vibration damping device overcomes the deficiencies of existing mechanical and hydraulic vibration damping solutions for shearers, develops a combined shearer vibration damping device, which is simple to manufacture and maintain and has strong practicability.

[0051] This vibration damping device can provide graded vibration damping at different vibration intensities. The disc spring shock absorber can meet the vibration damping requirements under lower vibrations, and under strong vibrations, the vibration can be absorbed through the damping oil, showing strong adaptability to the working face.

[0052] Under different coal seam hardness and vibration intensity conditions in different mines, disc spring shock absorbers and damping oils of different models can be configured to adjust the stiffness of the disc spring shock absorber and the damping of the damping oil, thereby adjusting the dynamic characteristics of the vibration damping system. The replacement is simple and convenient for adjustment.

[0053] Without changing the structure of the existing shearer, only adding this set of vibration damping system can protect the shearer boom. The structure is simple, the installation is convenient, and it is easy to promote.

[0054] 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 fall within 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 combined coal mining machine vibration reduction device, arranged on the body of the coal mining machine, used to reduce the vibration of the coal mining machine rocker arm, characterized in that: The vibration reduction device comprises a support connected to the base of the height adjustment oil cylinder, a support rod extending from the support toward the coal mining machine body, a disc spring vibration reduction device sleeved on the support rod, and a vibration reduction oil chamber provided on the coal mining machine body. The disc spring shock absorber is clamped between the support and the fuselage, and the other end of the support rod is inserted into the shock absorbing oil chamber. Vibration reduction of the rocker arm is achieved through the disc spring shock absorber and the shock absorbing oil in the shock absorbing oil chamber.

2. The combined coal mining machine vibration reduction device according to claim 1, characterized in that: The support comprises a main body portion fixedly connected to the support rod, and connecting portions extending from both ends of the main body portion in the opposite direction of the support rod, the connecting portions are respectively provided with through holes, the base of the height-adjusting oil cylinder is arranged between the two connecting portions, and the support and the height-adjusting oil cylinder are hinged to each other by a connecting pin that passes through the connecting portion and the base of the height-adjusting oil cylinder in sequence. Preferably, the support rod is connected to the center of the main body.

3. The combined coal mining machine vibration reduction device according to claim 2, characterized in that: The body of the coal mining machine is provided with a slide groove, and the support is movably arranged in the slide groove.

4. The combined coal mining machine vibration reduction device according to claim 3, characterized in that: The slide groove includes a first slide section for the main body to slide and a second slide section for the support rod to slide, and the disc spring damper is clamped between the main body and the bottom wall of the second slide section.

5. The combined vibration reduction device for coal mining machine according to claim 4, characterized in that: The width of the first sliding section is greater than that of the second sliding section, and the width of the first sliding section covers the width of the second sliding section, so as to limit the moving stroke of the support.

6. The combined vibration reduction device for coal mining machine according to claim 4, characterized in that: The vibration reduction device further comprises a guard plate, wherein the guard plate covers the slide groove. Preferably, the guard plate is connected to the side wall of the second sliding section.

7. The combined vibration reduction device for coal mining machine according to claim 4, characterized in that: A third sliding section is further extended on the bottom wall of the second sliding section. The width of the third sliding section is matched with the support rod. The vibration damping oil chamber is arranged on the bottom wall of the third sliding section.

8. The combined vibration reduction device for coal mining machine according to claim 7, characterized in that: A vibration-damping oil sealing element is provided on the side wall of one end of the support rod close to the vibration-damping oil chamber, and the vibration-damping oil sealing element is tightly fitted with the side wall of the third sliding section.

9. The combined coal mining machine vibration reduction device according to claim 8, characterized in that: An annular groove is arranged on the axial surface of the support rod, and the vibration damping oil sealing element is embedded in the annular groove.

10. The combined coal mining machine vibration reduction device according to claim 8, characterized in that: The vibration damping oil chamber is also provided with an oil injection nozzle, and the oil injection nozzle is arranged through the bottom wall of the third sliding section to inject vibration damping oil into the vibration damping oil chamber from the outside.

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