A gear oil circulating device for a shearer rocker arm and a shearer rocker arm

Abstract

The utility model provides a kind of gear oil circulating device for coal cutter rocker arm and coal cutter rocker arm, one of gear oil circulating device for coal cutter rocker arm, including the reduction gearbox with gear oil and oil suction control valve, reduction gearbox has positive, negative angle oil suction port and gear oil import, positive, negative angle oil suction port is set in rocker arm both ends, and oil suction control valve includes valve core and the valve body with cavity and oil outlet, valve core is located in cavity interior and can move in cavity interior, cavity both ends are respectively equipped with positive, negative angle oil inlet, negative angle oil inlet is set to one end of rocker arm, positive angle oil inlet is set to the other end of rocker arm, positive angle oil inlet is connected by pipeline with positive angle oil suction port, negative angle oil inlet is connected by pipeline with negative angle oil suction port, and oil outlet is transported back gear oil import of reduction gearbox by pipeline with gear oil, and circulation pump is set on the pipeline between oil outlet and gear oil import of reduction gearbox.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, specifically to a gear oil circulation device for a coal mining machine rocker arm and a coal mining machine rocker arm. Background Technology

[0002] The rocker arm of a coal mining machine houses a transmission gear set, which requires the circulation of gear oil for lubrication and cooling to improve its service life and transmission efficiency. Currently, a common practice is to install a gear oil circulation pump inside the rocker arm, forcing the oil to flow through a cooler to maintain a stable oil temperature. However, during operation, the rocker arm frequently swings up and down to adapt to changes in the coal seam, causing fluctuations in the gear oil level within the arm. When the rocker arm moves from a positive to a negative inclination angle, the lowest level of the oil level in the gearbox at the positive inclination angle becomes the highest level at the negative inclination angle. During this process, the suction port of the gear oil circulation pump may be briefly exposed above the oil surface, causing the pump to enter a cavitation state. Cavitation in the circulation pump can lead to dry friction and cavitation damage to internal pump components (such as gears or blades). Over time, this can reduce pump efficiency and even cause pump damage, affecting the normal operation of the coal mining machine. In existing technologies, although some attempts have been made to control oil circuit switching through sensors or solenoid valves, these solutions are often complex in structure, expensive, and rely on electronic components. In the harsh working environment of coal mining machines (such as high humidity and high dust), they are prone to failure and have insufficient reliability.

[0003] Therefore, existing technologies need further development. Utility Model Content

[0004] This utility model provides a gear oil circulation device for a coal mining machine rocker arm and a coal mining machine rocker arm, the specific implementation of which is as follows: A gear oil circulation device for a rocker arm of a coal mining machine includes a gearbox containing gear oil and an oil suction control valve. The gearbox has a positive angle oil suction port, a negative angle oil suction port, and a gear oil inlet. The positive angle oil suction port is located at one end of the rocker arm, and the negative angle oil suction port is located at the other end of the rocker arm. The oil suction control valve includes a valve core and a valve body having a cavity and an oil outlet. The valve core is located inside the cavity and can move inside the cavity. The cavity has a positive angle oil inlet and a negative angle oil inlet at its two ends, respectively. The negative angle oil inlet is located at one end of the rocker arm, and the positive angle oil inlet is located at the other end of the rocker arm. The positive angle oil inlet and the positive angle oil suction port are connected by a pipeline, and the negative angle oil inlet and the negative angle oil suction port are connected by a pipeline. The oil outlet transports the gear oil back to the gear oil inlet of the gearbox through a pipeline. A circulation pump is installed on the pipeline between the oil outlet and the gear oil inlet of the gearbox.

[0005] Furthermore, the two ends of the cavity are configured with conical sealing surfaces corresponding to the valve core.

[0006] Furthermore, a cooling device is provided on the pipeline between the oil outlet and the gear oil inlet of the gearbox.

[0007] Furthermore, the valve core has a spherical structure.

[0008] Furthermore, the line connecting the two ends of the cavity is parallel to the swing axis of the rocker arm.

[0009] Furthermore, the line connecting the two ends of the cavity coincides with the swing axis of the rocker arm.

[0010] This utility model also provides a rocker arm for a coal mining machine, including a rocker arm body and the aforementioned gear oil circulation device, wherein the gear oil conveying device is located on the rocker arm body.

[0011] Beneficial effects: 1. This utility model utilizes a rocker arm that swings up and down during operation to design a novel gear oil circulation device. The valve core switches positions between the positive and negative inlet ports as the rocker arm swings, preventing the circulation pump from being in a vacuum state. Moreover, the gravity-driven valve core is sensitive to changes in the rocker arm angle and can quickly switch the oil circuit, ensuring that the oil inlet remains unobstructed during changes in positive and negative inlet angles, eliminating the risk of flow interruption. It requires no additional sensors, electromagnets, or complex control mechanisms, has a simple principle, and a low failure rate, making it very suitable for the harsh working environment of coal mining machines in underground mines.

[0012] 2. The cavity ends of the oil suction control valve of this utility model are tapered sealing surfaces, which can achieve a tight fit with the valve core, effectively preventing air from seeping in from the closed oil suction port and ensuring the reliability of the seal. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a gear oil conveying device for a coal mining machine rocker arm according to this utility model; Figure 2 This is a schematic diagram of the structure of a gear oil conveying device for a coal mining machine rocker arm according to this utility model; The above figures include the following reference numerals: 1. Gearbox; 11. Positive tilt angle oil inlet; 12. Negative tilt angle oil inlet; 13. Gear oil inlet; 2. Oil suction control valve; 21. Positive tilt angle oil inlet; 22. Negative tilt angle oil inlet; 23. Valve core; 24. Valve body; 25. Oil outlet; 3. Circulating pump; 4. Cooling device; 5. Rocker arm body. Detailed Implementation

[0014] The specific embodiments of this utility model are described below with reference to the accompanying drawings and examples: It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0015] Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0016] According to an embodiment of this utility model, a gear oil circulation device for a coal mining machine rocker arm and a coal mining machine rocker arm are provided. Please refer to [link to relevant documentation]. Figures 1 to 2 ,include: like Figure 1 A gear oil circulation device for a rocker arm of a coal mining machine includes a reduction gearbox 1 containing gear oil and an oil suction control valve 2. The reduction gearbox 1 has a positive tilt angle oil suction port 11, a negative tilt angle oil suction port 12, and a gear oil inlet 13. The positive tilt angle oil suction port 11 is located at one end of the rocker arm, and the negative tilt angle oil suction port 12 is located at the other end of the rocker arm. The oil suction control valve 2 includes a valve core 23 and a valve body 24 having a cavity and an oil outlet 25. The valve core 23 is located inside the cavity and can move inside the cavity. The cavity has oil inlets and outlets at both ends. A positive tilt angle oil inlet 21 and a negative tilt angle oil inlet 22 are provided. The negative tilt angle oil inlet 22 is located at one end of the rocker arm, and the positive tilt angle oil inlet 21 is located at the other end of the rocker arm. The positive tilt angle oil inlet 21 is connected to the positive tilt angle oil suction port 11 via a pipeline, and the negative tilt angle oil inlet 22 is connected to the negative tilt angle oil suction port 12 via a pipeline. The oil outlet 25 transports gear oil back to the gear oil inlet 13 of the gearbox 1 via a pipeline. A circulation pump 3 is installed on the pipeline between the oil outlet 25 and the gear oil inlet 13 of the gearbox 1. The circulation pump 3 provides power for the entire gear oil circulation device. The valve core 23 switches positions between the positive inlet 21 and the negative inlet 22 as the rocker arm of the coal mining machine swings, preventing the circulating pump 3 from being in a vacuum state. Moreover, the gravity-driven valve core 23 is sensitive to changes in the rocker arm angle and can quickly switch the oil circuit, ensuring that the oil inlet is always unobstructed during changes in positive and negative inlet angles, with no risk of flow interruption. It does not require additional sensors, electromagnets or complex control mechanisms, has a simple principle, low failure rate, and is very suitable for the harsh working environment of coal mining machines underground.

[0017] The two ends of the cavity are provided with conical sealing surfaces corresponding to the valve core 23. The conical sealing surface on the inner side of the valve body 24 of the oil suction control valve 2 can achieve a tight fit with the valve core 23, effectively preventing air from seeping in from the closed oil suction port and ensuring the reliability of the seal.

[0018] A cooling device 4 is installed on the pipeline between the oil outlet 25 and the gear oil inlet 13 of the gearbox 1. The cooling device 4 cools the gear oil to improve the working life and efficiency of the workpiece inside the rocker arm.

[0019] The valve core 23 has a spherical structure. The spherical shape of the valve core 23 facilitates rolling under the influence of gravity and allows it to better fit the valve body 24 to ensure a tight seal.

[0020] The line connecting the two ends of the cavity is parallel to the swing axis of the rocker arm. The oil suction control valve 2 is placed parallel to the swing axis of the rocker arm to ensure that the valve core 23 inside the cavity can sensitively sense the changes in the swing of the rocker arm.

[0021] The line connecting the two ends of the cavity coincides with the swing axis of the rocker arm. When the rocker arm swings, the deformation and vibration at the point where the axis of the cavity coincides with the swing axis are relatively small, resulting in a better working environment for the oil suction control valve 2 and enabling it to maintain a seal effectively for a long time.

[0022] like Figure 2 The present invention also provides a rocker arm for a coal mining machine, including a rocker arm body 5 and the aforementioned gear oil circulation device, wherein the gear oil circulation device is installed on the rocker arm body 5 by means of a threaded connection.

[0023] The working principle of this utility model is as follows: The gearbox 1 contains half its capacity of gear oil, which lubricates and cools the transmission gear set inside the gearbox 1.

[0024] A positive tilt angle is defined as the slope of the line connecting the two endpoints of the positive tilt angle oil inlet 11 and the negative tilt angle oil inlet 12 being greater than zero. When the rocker arm is at a positive tilt angle, the valve core 23 in the oil suction control valve 2 moves towards the negative tilt angle oil inlet 22 due to the influence of gravity on the rocker arm and blocks the negative tilt angle oil inlet 22. The gear oil in the gearbox 1 can only be drawn out from the positive tilt angle oil inlet 11 and cannot be drawn out by the negative tilt angle oil inlet 12. The gear oil enters the oil suction control valve 2 through the positive tilt angle oil inlet 21 and then enters the circulation pump 3 through the oil outlet 25. The gear oil enters the cooling device 4 through the circulation pump 3. After being cooled by the cooling device 4, the gear oil re-enters the gearbox 1 through the gear oil inlet 13, thereby cooling and lubricating the transmission gear set.

[0025] A negative inclination angle is defined as a line connecting the two endpoints of the positive inclination angle oil inlet 11 and the negative inclination angle oil inlet 12 with a slope less than zero. When the rocker arm is at a negative inclination angle, the valve core 23 in the oil suction control valve 2 moves towards the positive inclination angle oil inlet 21 due to the influence of gravity on the rocker arm and blocks the positive inclination angle oil inlet 21. The gear oil in the gearbox 1 can only be drawn out from the negative inclination angle oil inlet 12 and cannot be drawn out by the positive inclination angle oil inlet 11. The gear oil enters the oil suction control valve 2 through the negative inclination angle oil inlet 22 and then enters the circulation pump 3 through the oil outlet 25. The gear oil enters the cooling device 4 through the circulation pump 3. After being cooled by the cooling device 4, the gear oil re-enters the gearbox 1 through the gear oil inlet 13, thereby cooling and lubricating the transmission gear set.

[0026] The purpose of this invention is to prevent damage to the circulating pump 3 and to ensure that the rocker arm can be cooled by oil circulation at the lowest position of the gear oil in both positive and negative tilt angles.

[0027] Many other changes and modifications can be made without departing from the concept and scope of this utility model. It should be understood that this utility model is not limited to the specific embodiments, and the scope of this utility model is defined by the appended claims.

Claims

1. A gear oil circulation device for a coal mining machine rocker arm, characterized in that, The system includes a gearbox containing gear oil and an oil suction control valve. The gearbox has a positive angle oil suction port, a negative angle oil suction port, and a gear oil inlet. The positive angle oil suction port is located at one end of a rocker arm, and the negative angle oil suction port is located at the other end of the rocker arm. The oil suction control valve includes a valve core and a valve body having a cavity and an oil outlet. The valve core is located inside the cavity and can move inside the cavity. The cavity has a positive angle oil inlet and a negative angle oil inlet at its two ends, respectively. The negative angle oil inlet is located at one end of the rocker arm, and the positive angle oil inlet is located at the other end of the rocker arm. The positive angle oil inlet and the positive angle oil suction port are connected by a pipeline, and the negative angle oil inlet and the negative angle oil suction port are connected by a pipeline. The oil outlet transports gear oil back to the gear oil inlet of the gearbox through a pipeline. A circulation pump is installed on the pipeline between the oil outlet and the gear oil inlet of the gearbox.

2. The gear oil circulation device for a coal mining machine rocker arm according to claim 1, characterized in that, The valve cores at both ends of the cavity are configured with conical sealing surfaces.

3. The gear oil circulation device for a coal mining machine rocker arm according to claim 1, characterized in that, A cooling device is installed on the pipeline between the oil outlet and the gear oil inlet of the gearbox.

4. The gear oil circulation device for a coal mining machine rocker arm according to claim 1, characterized in that, The valve core has a spherical structure.

5. The gear oil circulation device for a coal mining machine rocker arm according to claim 1, characterized in that, The line connecting the two ends of the cavity is parallel to the swing axis of the rocker arm.

6. The gear oil circulation device for a coal mining machine rocker arm according to claim 5, characterized in that, The line connecting the two ends of the cavity coincides with the swing axis of the rocker arm.

7. A rocker arm for a coal mining machine, characterized in that, It includes a rocker arm body and a gear oil circulation device as described in any one of claims 1-6, wherein the gear oil delivery device is located on the rocker arm body.

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