Anti-vibration fixing device for long screw of coal mining machine

Abstract

The utility model discloses an anti-vibration fixing device for a long screw of a coal mining machine, and belongs to the technical field of coal mining machines. An anti-vibration fixing device for a long screw of a coal mining machine comprises a fixing assembly, the fixing assembly is arranged in a long screw mounting groove along the two sides of the axial direction of the long screw, and the binding face, facing the long screw, of the fixing assembly is in the shape matched with the opposite face of the long screw. And the fixing assemblies are clamped on the two sides of the long screw rod through the binding faces. The anti-vibration fixing device is simple and reliable in structure, convenient to machine and manufacture, high in applicability, high in flexibility and high in generalizability, the long screw rod can be fixed in the horizontal direction, and the installation point position of the anti-vibration fixing device can be adjusted and arranged according to vibration impact of coal mining machines of different models and working conditions and the inherent frequency condition of the long screw rod.

Description

Technical Field

[0001] This utility model relates to the field of coal mining machine technology, and in particular to a vibration-damping and fixing device for a long screw of a coal mining machine. Background Technology

[0002] Coal mining machines are crucial equipment in underground fully mechanized coal mining faces. Currently, double-drum electrically traction coal mining machines are commonly used, moving back and forth on scraper conveyors to cut and load coal at the working face. To improve the reliability of coal mining machines, they are typically divided into five main components based on their structural function: left and right cutting sections, left and right traction sections, and a central electrical control box. The left and right traction sections and the central electrical control box are connected by circular pins for positioning and long screws for tensioning, often referred to as the three sections of the central machine body. The coal mining machine body has a flat structure. When the drums cut coal, the machine body vibrates and deforms, especially when the drums cut a large amount of gangue and the machine is relatively light, resulting in strong impact vibrations that cause the machine body to vibrate. The long screw, due to its cantilever structure, also experiences tensile deformation and impact vibrations, leading to loose nuts or even screw breakage and failure, seriously affecting safe production in the mine.

[0003] like Figure 1 As shown, the coal mining machine includes a left cutting section 1, a machine body 2, and a right cutting section 3. The machine body 2 comprises three modules: a left traction section 21, an electrical control box 23, and a right traction section 25. These three modules are typically fixedly connected by a short screw assembly 22 and a long screw assembly 24 (e.g., Figure 2 (As shown). The long screw 241 is subjected to force by the nuts at both ends, tightly pulling the three sections of the machine body together. However, due to manufacturing errors and ease of maintenance, the middle part of the long screw is mostly suspended in the air (as shown). Figure 3 and Figure 4 (As shown). When the drum of a coal mining machine cuts hard rock, it generates strong vibrations and impacts, causing the machine body to vibrate and deform. When the vibration frequency is close to or the same as the natural frequency of the long screw, resonance occurs, causing the long screw to vibrate strongly. The threads at the connection points between the long screw and the nut at both ends experience increased stress, leading to stress concentration and rapid fatigue fracture failure. Consequently, the nut loosens, posing a safety risk. Therefore, it is necessary to increase the stiffness of the long screw, raise its natural frequency, and avoid the resonance point. The current common practice is to add rubber pads or pressure plates for fixation. However, in actual use, rubber pads have low stiffness, large volume, and are prone to aging, while pressure plate fixation often loosens due to screw vibration, resulting in poor effectiveness. Neither approach adequately solves the vibration resistance problem. Summary of the Invention

[0004] The purpose of this utility model is to provide a vibration-damping and fixing device for the long screw of a coal mining machine to address the above-mentioned problems.

[0005] The purpose of this utility model is achieved as follows:

[0006] A vibration damping and fixing device for a long screw of a coal mining machine includes a fixing component, which is disposed on both sides of the long screw along the axial direction and in the long screw mounting groove. The contact surface of the fixing component facing the long screw has a shape that matches the opposite surface of the long screw, so that the fixing component is clamped to both sides of the long screw through the contact surface.

[0007] The fixing component includes a mounting block and a fixing block;

[0008] The fixing block is close to the long screw, and the contact surface of the fixing block facing the long screw has a shape that matches the opposite surface of the long screw;

[0009] The two opposite sides of the mounting block and the fixing block that are close to each other are matched inclined surfaces, and the inclined surfaces slope from the direction away from the long screw mounting groove toward the bottom of the long screw mounting groove;

[0010] By fixing the mounting block into the mounting groove of the long screw, the fixing block is clamped to both sides of the long screw.

[0011] The bottom of the fixing block abuts against the bottom of the long screw mounting groove, and there is a gap between the bottom of the mounting block and the bottom of the long screw mounting groove.

[0012] It also includes fastening screws; the fixing block has mounting holes; the fastening screws pass through the mounting holes to fix the fixing block in the long screw mounting groove.

[0013] It also includes a locking washer; the mounting hole is a T-shaped hole; the locking washer is sleeved on the screw of the fastening screw and received in the large hole of the T-shaped hole.

[0014] The fixing components are symmetrically arranged along the long screw.

[0015] The advantages of this utility model are: simple and reliable structure, convenient processing and manufacturing, horizontal fixation of long screw, strong applicability, and the installation points of the anti-vibration fixing device can be adjusted according to the vibration and impact of different models and working conditions of coal mining machines and the natural frequency of long screws. It has high flexibility and strong scalability. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of an existing coal mining machine is shown;

[0017] Figure 2 A schematic diagram of the existing coal mining machine body is shown;

[0018] Figure 3 A schematic diagram of the installation of the long screw in the body of an existing coal mining machine is shown;

[0019] Figure 4 It shows Figure 3 Cross-sectional view along A1-A1;

[0020] Figure 5 This is a top view schematic diagram of an embodiment of the anti-vibration fixing device for the long screw of a coal mining machine according to the present invention;

[0021] Figure 6 It shows Figure 5 A schematic diagram of the cross-section along A3-A3;

[0022] Figure 7 This diagram shows the usage status of the anti-vibration fixing device for the long screw of the coal mining machine according to this utility model;

[0023] Figure 8 It shows Figure 7 Cross-sectional view along A2-A2;

[0024] Figure 9 A cross-sectional schematic diagram of another embodiment of the anti-vibration fixing device for the long screw of the coal mining machine of this utility model is shown.

[0025] Figure 10 A schematic diagram of the structure of a coal mining machine body equipped with the anti-vibration fixing device for the long screw of this utility model is shown.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Left cutting section;

[0028] 2-Fuselage;

[0029] 21-Left traction unit;

[0030] 22-Short screw assembly;

[0031] 23-Electrical control box;

[0032] 24-Long screw assembly;

[0033] 241 - Long screw;

[0034] 25 - Right traction unit;

[0035] 26 - Long screw mounting slot;

[0036] 3-Right cutting section 3;

[0037] 4-Anti-vibration fixtures

[0038] 41-Fixed components;

[0039] 411-Mounting block, 412-Fixing block;

[0040] 42 - Fastening screw;

[0041] 43 - Locking washer. Detailed Implementation

[0042] Various embodiments of this utility model will be described with reference to the accompanying drawings. In the specification and drawings, elements with similar structures or functions will be represented by the same element symbols. It is understood that the drawings are for reference and illustration only and are not intended to limit the scope of this utility model. The dimensions shown in the drawings are merely for clarity of description and do not limit the proportional relationships or provide an exhaustive description of the utility model, nor do they limit the scope of this utility model.

[0043] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] This utility model proposes a vibration-damping and fixing device for the long screw of a coal mining machine.

[0045] In one embodiment, such as Figures 5-8 As shown, a vibration damping and fixing device for a long screw of a coal mining machine includes fixing components 41, which are disposed on both sides of the long screw 241 along its axial direction and within the long screw mounting groove 26. The contact surface of the fixing components 41 facing the long screw 241 has a shape that matches the opposite surface of the long screw 241, so that the fixing components 41 are clamped to both sides of the long screw 241 through the contact surface. Preferably, the fixing components 41 are symmetrically arranged along the long screw 241.

[0046] Specifically, the fixing component 41 includes a mounting block 411 and a fixing block 412. The fixing block 412 is close to the long screw 241, and the mating surface of the fixing block 412 facing the long screw 241 has a shape that matches the opposite surface of the long screw 241. For example, if the long screw 241 has a square cross-section, the mating surface of the fixing block 412 can be a plane; if the long screw 241 has a circular or elliptical cross-section, the mating surface of the fixing block 412 can be an arc-shaped surface (e.g., ...). Figure 9 (As shown). The various shapes of the mating surfaces can be used to fix long screws 241 of different shapes to better fit the long screws 241, with a wide range of applications and strong portability.

[0047] The two opposing sides of the mounting block 411 and the fixing block 412 are matched inclined surfaces, which slope from the direction away from the long screw mounting groove 26 toward the bottom of the long screw mounting groove 26. Preferably, the surface friction coefficient is also increased. By fixing the mounting block 411 into the long screw mounting groove 26, the fixing block 412 is clamped to both sides of the long screw 241. Due to the effect of the inclined surfaces, a high degree of self-locking can be achieved, and pre-tightening can be achieved in the horizontal direction.

[0048] Furthermore, the bottom of the fixing block 412 abuts against the bottom of the long screw mounting groove 26, and there is a gap between the bottom of the mounting block 411 and the bottom of the long screw mounting groove 26.

[0049] To ensure the mounting block 411 is securely fixed, the vibration damping device 4 also includes a fastening screw 42 and a locking washer 43. The mounting block 412 has a T-shaped mounting hole. The fastening screw 42 passes through the mounting hole, fixing the mounting block 412 into the long screw mounting groove 26. The locking washer 43 is fitted onto the screw of the fastening screw 42 and received within the larger hole of the T-shaped hole. The locking washer 43 serves to prevent loosening.

[0050] In actual use, the vibration damping and fixing device for the long screw of the coal mining machine described in this embodiment can be adjusted according to the vibration and impact of different models and working conditions of the coal mining machine and the natural frequency of the long screw 241, so that it is reasonably arranged on both sides of the axial direction of the long screw 241 (e.g., Figure 10 (As shown). For coal mining machines already in use, anti-vibration mounting grooves need to be opened along the axial direction of the long screw 241 in the long screw mounting groove 26 for installing the anti-vibration fixing device 4. The anti-vibration fixing device 4 achieves self-locking through the inclined surfaces of the mounting block 411 and the fixing block 412. Combined with the use of the locking washer 43, double protection can be achieved to avoid the vibration failure of the anti-vibration fixing device 4 itself and improve the reliability of the fixing protection. In addition, by adjusting the preload of the fastening screws 42 in the anti-vibration fixing devices 4 on both sides of the long screw 241, the fixing block 412 can be moved and adjusted in the horizontal direction to ensure that when both sides are pressed, the axial tensile force on the long screw 241 is on the same straight line. Other fixing points are installed in the same way. Multi-point fixing can greatly improve the vibration resistance of the long screw 241.

[0051] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A vibration damping and fixing device for a long screw of a coal mining machine, characterized in that, The device includes a fixing component disposed on both sides along the axial direction of the long screw in the mounting groove of the long screw. The contact surface of the fixing component facing the long screw has a shape that matches the opposite surface of the long screw, so that the fixing component is clamped to both sides of the long screw through the contact surface.

2. The anti-vibration fixing device for the long screw of a coal mining machine according to claim 1, characterized in that, The fixing component includes a mounting block and a fixing block; The fixing block is close to the long screw, and the contact surface of the fixing block facing the long screw has a shape that matches the opposite surface of the long screw; The two opposite sides of the mounting block and the fixing block that are close to each other are matched inclined surfaces, and the inclined surfaces slope from the direction away from the long screw mounting groove toward the bottom of the long screw mounting groove; By fixing the mounting block into the mounting groove of the long screw, the fixing block is clamped to both sides of the long screw.

3. The anti-vibration fixing device for the long screw of a coal mining machine according to claim 2, characterized in that, The bottom of the fixing block abuts against the bottom of the long screw mounting groove, and there is a gap between the bottom of the mounting block and the bottom of the long screw mounting groove.

4. The anti-vibration fixing device for the long screw of a coal mining machine according to claim 2 or 3, characterized in that, It also includes fastening screws; the fixing block has mounting holes; the fastening screws pass through the mounting holes to fix the fixing block in the long screw mounting groove.

5. The anti-vibration fixing device for the long screw of a coal mining machine according to claim 4, characterized in that, It also includes a locking washer; the mounting hole is a T-shaped hole; the locking washer is sleeved on the screw of the fastening screw and received in the large hole of the T-shaped hole.

6. The anti-vibration fixing device for the long screw of a coal mining machine according to any one of claims 1-3, characterized in that, The fixing components are symmetrically arranged along the long screw.

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