Anti-impact hydraulic system of coal mining machine

Abstract

The invention belongs to the technical field of coal mining machinery, and discloses an anti-impact coal mining machine hydraulic system which comprises an oil tank, a gear pump, a left heightening oil cylinder, a right heightening oil cylinder, a one-way valve and a fine filter. The left height-adjusting oil cylinder and the right height-adjusting oil cylinder are both connected with a manual-hydraulic reversing valve and an electromagnetic reversing valve; the oil tank is connected into the gear pump through the coarse filter, the gear pump is driven by a motor, an oil outlet of the gear pump, the one-way valve and the fine filter are sequentially connected to form a main oil way, the main oil way is connected into the height adjusting oil cylinders, and an overflow valve is connected between the oil outlet of the gear pump and the one-way valve in series. According to the technical scheme, the impact of the hydraulic system can be effectively buffered, and the gear pump is prevented from being damaged by the impact of the hydraulic system.

Description

Technical Field

[0001] This invention belongs to the field of coal mining machinery technology, and in particular relates to a hydraulic system for an anti-impact coal mining machine. Background Technology

[0002] The power for raising and lowering the rocker arm of a coal mining machine comes from the extension and retraction of the height adjustment cylinder, which in turn is powered by the gear pump in the hydraulic system. In thin coal seam mining faces, the rocker arm experiences significant vibration and frequent impacts due to frequent rock cutting. Furthermore, when the working load on the rocker arm increases sharply, the cylinder can impact the gear pump in the hydraulic system, potentially causing it to jam and become damaged. Existing hydraulic systems rely solely on hydraulic locks or balance valves to prevent oil backflow. However, when the pressure exceeds 30 MPa, the oil can break through the hydraulic lock, allowing some oil to flow back and impact the gear pump. Moreover, existing hydraulic systems are not sensitive enough to fluctuations in the hydraulic system, making it difficult to detect oil backflow and leading to gear pump failure. Summary of the Invention

[0003] The purpose of this invention is to provide an anti-impact hydraulic system for coal mining machines to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides a hydraulic system for an anti-impact coal mining machine, comprising an oil tank, a gear pump, a left height adjustment cylinder, a right height adjustment cylinder, a check valve, and a fine filter; both the left and right height adjustment cylinders are connected to a manual hydraulic directional valve and a solenoid directional valve; the oil tank is connected to the gear pump through a coarse filter, the gear pump is driven by a motor, the oil outlet of the gear pump, the check valve, and the fine filter are connected in sequence to form a main oil circuit, the main oil circuit is connected to each height adjustment cylinder, and an overflow valve is connected in series between the oil outlet of the gear pump and the check valve.

[0005] Optionally, a pressure monitoring system may also be included, which includes a pressure sensor and a data monitoring unit. The pressure sensor is installed in the main oil circuit, and the pressure sensor and the data monitoring unit are communicatively connected.

[0006] Optionally, the end of the one-way valve away from the gear pump is connected to the pressure sensor via a tee.

[0007] Optionally, both the left and right height adjustment cylinders are equipped with hydraulic locks.

[0008] Optionally, a pressure gauge is provided in the oil line between the one-way valve and the fine filter.

[0009] The technical effects of this invention are as follows: This invention provides an anti-impact hydraulic system for coal mining machines. It incorporates a check valve, a relief valve, and a pressure sensor in the main oil circuit, preventing cylinder self-falling and gear pump damage caused by the hydraulic lock being breached or damaged. Simultaneously, it can monitor the main oil circuit pressure in real time, with feedback sensitivity higher than existing pressure gauges. The entire device has a simple structure, provides comprehensive anti-impact protection for the gear pump, and offers higher reliability for the hydraulic system. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the hydraulic system of the anti-impact coal mining machine in an embodiment of the present invention.

[0012] Labeling Explanation: 1. Gear Pump; 2. Coarse Filter; 3. Motor; 4. Relief Valve; 5. Check Valve; 6. Pressure Sensor; 7. Left Height Adjustment Cylinder; 8. Right Height Adjustment Cylinder; 9. Hydraulic Lock; 10. Manual Hydraulic Directional Valve; 11. Solenoid Directional Valve; 12. Fine Filter; 13. Pressure Gauge; 14. High-Pressure Relief Valve; 15. Low-Pressure Relief Valve; 16. Brake Solenoid Valve; 17. Check Valve. Detailed Implementation

[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0014] To facilitate understanding of the present invention, a more comprehensive description of the invention will be given below with reference to the accompanying drawings, and several embodiments of the invention will be provided. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be more thorough and complete.

[0015] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only. The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, this embodiment provides a hydraulic system for an anti-impact coal mining machine, including an oil tank, a gear pump 1, a left height adjustment cylinder 7, a right height adjustment cylinder 8, a check valve 5, and a fine filter 12. Both the left and right height adjustment cylinders 7 and 8 are equipped with hydraulic locks 9. Both cylinders 7 and 8 are connected to a manual hydraulic directional valve 10 and a solenoid directional valve 11. The oil tank is connected to the gear pump 1 via a coarse filter 2. The gear pump 1 is driven by a motor 3. The outlet of the gear pump 1, the check valve 5, and the fine filter 12 are connected sequentially to form the main oil circuit. The main oil circuit is connected to each height adjustment cylinder. An overflow valve 4 (20MPa) is installed between the outlet of the gear pump 1 and the check valve 5. By connecting an overflow valve 4 in series at the outlet of the gear pump 1, damage to the gear pump 1 due to jamming can be prevented.

[0020] It is feasible to configure a check valve 5 connected in series in the main oil circuit. When the impact pressure is too large, causing the hydraulic lock 9 to open and leak, the two check valves 5 can prevent the oil from flowing back and avoid the backflow liquid from impacting the gear pump 1. In this feasible embodiment, a pressure monitoring system is also provided, including a pressure sensor 6. The pressure sensor 6 displays the data on the display screen of the operation control platform through a sensor center interface. The pressure sensor 6 is located after the check valve 5, and the rear end of the check valve 5 is connected to the pressure sensor 6 through a T-junction. It can detect the main oil circuit pressure in real time and provide timely feedback when there are pressure fluctuations or oil backflow, making it easier to monitor the working status of the oil circuit system. Existing hydraulic systems rely on pressure gauges to detect the main oil inlet pressure, which has low sensitivity to oil impacts and cannot detect oil backflow in time, causing damage to the gear pump 1. This embodiment uses a pressure sensor 6 to detect the main oil inlet pressure in real time and can provide timely feedback on oil fluctuations and backflow, which can better monitor the working status of the oil circuit system.

[0021] Implementably, a pressure gauge 13 is installed on the oil line between the one-way valve 5 and the fine filter 12. A high-pressure relief valve (18MPa) is installed on the oil line between the fine filter 12 and the pressure gauge 13; a one-way valve 17 is installed between the fine filter 12 and the solenoid directional valve 11. An oil outlet pressure gauge is connected to the oil outlet of the fine filter, and a low-pressure relief valve 15 (2.5MPa) is connected in series.

[0022] As is feasible, the hydraulic system of the anti-impact coal mining machine provided in this embodiment also includes a braking system, including a brake solenoid valve 16, which is set in parallel with the main oil circuit.

[0023] In summary, this embodiment incorporates a check valve 5 and a pressure sensor 6 in the main oil circuit, preventing cylinder self-falling and gear pump 1 damage caused by the hydraulic lock 9 being breached or damaged. It also allows for real-time monitoring of the main oil circuit pressure, with feedback sensitivity higher than existing pressure gauges 13. Furthermore, this embodiment is specifically designed for thin coal seam working faces with harsh operating conditions; the addition of an overflow valve 4 enhances the reliability of the hydraulic system. Compared to existing technologies, the entire device provided in this embodiment has a simple structure, comprehensive shock protection for the gear pump 1, and higher hydraulic system reliability.

[0024] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A hydraulic system for an anti-impact coal mining machine, characterized in that, It includes an oil tank, a gear pump (1), a left height adjustment cylinder (7), a right height adjustment cylinder (8), a check valve (5), and a fine filter (12); the left height adjustment cylinder (7) and the right height adjustment cylinder (8) are both connected to a manual hydraulic directional valve (10) and a solenoid directional valve (11); the oil tank is connected to the gear pump (1) through a coarse filter (2), the gear pump (1) is driven by a motor (3), the oil outlet of the gear pump (1), the check valve (5) and the fine filter (12) are connected in sequence to form the main oil circuit, the main oil circuit is connected to each height adjustment cylinder, and an overflow valve (4) is connected in series between the oil outlet of the gear pump (1) and the check valve (5).

2. The anti-impact coal mining machine hydraulic system according to claim 1, characterized in that, It also includes a pressure sensor (6), which is located in the main oil circuit.

3. The anti-impact coal mining machine hydraulic system according to claim 2, characterized in that, The end of the one-way valve (5) away from the gear pump (1) is connected to the pressure sensor (6) via a tee.

4. The anti-impact coal mining machine hydraulic system according to claim 1, characterized in that, Both the left height adjustment cylinder (7) and the right height adjustment cylinder (8) are equipped with hydraulic locks (9).

5. The anti-impact coal mining machine hydraulic system according to claim 1, characterized in that, A pressure gauge (13) is installed on the oil line between the one-way valve (5) and the fine filter (12).

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