Hydraulic pump leakage diagnosis device for coal mining machine

Abstract

The invention discloses a hydraulic pump leakage diagnosis device for a coal mining machine, which relates to the technical field of hydraulic pump pipeline leakage diagnosis and comprises a base, a pump body arranged on the base, a control end connected to the outer wall of the pump body in a sensing manner, an oil conveying pipe communicated with the input and output ends of the pump body and a return pipe arranged on the oil conveying pipe, the magnetic driving assembly is arranged on the backflow pipe in a sliding mode and synchronously reciprocates with liquid, and the leakage filling diagnosis assembly is connected with the magnetic driving assembly and used for detecting leakage of the backflow pipe and conducting temporary filling. Through the method and the device, the problems that an existing leakage diagnosis mode of the hydraulic pump for the coal mining machine cannot actively intervene in the initial leakage stage (such as tiny damage of an oil pipe), so that the risks of equipment damage and production interruption are easily increased, and tiny changes of pressure or flow cannot be detected in time are solved; therefore, the situation of missing report or false report occurs occasionally, and the accuracy and reliability of diagnosis are affected.

Description

Technical Field

[0001] This invention relates to the field of hydraulic pump pipeline leakage diagnosis technology, specifically a hydraulic pump leakage diagnosis device for coal mining machines. Background Technology

[0002] The hydraulic pump leakage diagnosis device for coal mining machines is a leakage monitoring and fault diagnosis device specifically designed for hydraulic pump systems in coal mining equipment. Its core function is to accurately identify leakage problems (such as internal leakage and external leakage) of hydraulic pumps and related pipelines by real-time monitoring of the state, parameters and flow characteristics of fluids (mainly hydraulic oil) in the hydraulic system, and to realize leakage location, severity assessment and early warning, thereby ensuring the safe and stable operation of the hydraulic system of the coal mining machine.

[0003] For example, a segmented leak diagnosis system, segmented leak diagnosis method and vehicle disclosed in CN116026532A can realize segmented diagnosis of fuel lines, and at the same time reduce the impact of oil and gas release on the carbon canister and save fuel. However, the leak diagnosis device still has some shortcomings.

[0004] Most existing methods for diagnosing leaks in hydraulic pumps used in coal mining machines rely on alarms after a leak occurs, and the response is only triggered when oil is lost and pressure drops sharply. This makes it impossible to proactively intervene in the initial stage of a leak (such as minor damage to the oil pipe), which can easily increase the risk of equipment damage and production interruption. Furthermore, because it is impossible to detect subtle changes in pressure or flow in a timely manner, false alarms or missed alarms often occur, affecting the accuracy and reliability of the diagnosis.

[0005] To address the aforementioned issues, there is an urgent need for innovative design based on the existing hydraulic pump leakage diagnosis device for coal mining machines. Summary of the Invention

[0006] This invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different approach. Specifically, the invention aims to provide a leakage diagnosis device for hydraulic pumps used in coal mining machines. This addresses the shortcomings of existing leakage diagnosis methods for hydraulic pumps used in coal mining machines, which cannot proactively intervene in the initial stage of leakage, increasing the risk of equipment damage and production interruption. Furthermore, the inability to detect subtle changes in pressure or flow in a timely manner leads to frequent missed or false alarms, affecting the accuracy and reliability of the diagnosis.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic pump leakage diagnosis device for a coal mining machine, comprising a base, a pump body disposed on the base, a control terminal connected to the outer wall of the pump body, an oil delivery pipe connected to the input and output terminals of the pump body, and a return pipe disposed on the oil delivery pipe; further comprising a magnetic drive component slidably disposed on the return pipe based on synchronous reciprocating flow with the liquid, and a leakage filling diagnosis component connected to the magnetic drive component for detecting leakage in the return pipe and temporarily filling it; The magnetic drive assembly includes magnetic balls arranged at equal angles inside the return pipe and a first magnetic ring connected to the leak filling diagnostic assembly. The leak filling diagnostic component includes a detection shell ring connected to one end of the first magnetic ring and sleeved on the return pipe, filling blocks arranged at equal angles inside the detection shell ring, and a rubber membrane disposed at the bottom of the filling blocks.

[0008] Preferably, the magnetic drive assembly further includes a piston ring disposed at the center of the magnetic ball, the magnetic ball being slidably disposed on the outer wall of the piston ring, and the magnetic ball being magnetically attracted to the first magnetic ring.

[0009] Preferably, the leak filling diagnostic assembly further includes a lifting member fixedly connected to the center of the top of the rubber diaphragm, connecting rods fixedly connected to the inner wall of the detection shell ring in a symmetrical arrangement, a rotating shaft fixedly connected to the end of the connecting rod, and a rotating rod rotatably mounted on the rotating shaft, one end of the rotating rod being connected to the inner wall of the filling block.

[0010] Preferably, the top of the lifting member is fixedly connected with symmetrically distributed top rods, and a drive rod is fixedly connected to one side of the top rod. One end of the drive rod passes through the other end of the rotating rod to lift the rotating rod and cause it to rotate.

[0011] Preferably, the other end of the rotating rod has a movable groove.

[0012] Preferably, the drive rod is disposed in the movable groove and located in the center of the movable groove.

[0013] Preferably, the bottom of the filling block is slidably provided with symmetrically distributed auxiliary balls, the ends of which are in contact with the outer wall of the return pipe.

[0014] Preferably, the filling block has a shrinkage groove for the auxiliary ball to shrink, a spring is provided in the shrinkage groove, a connecting plate is fixedly connected to the bottom of the spring, and the connecting plate is in contact with the auxiliary ball.

[0015] Preferably, the rubber membrane is deformed by leakage pressure into a filling cavity for sealing the leak in the return pipe.

[0016] Preferably, the joints of each filling block are inverted triangular to form a flow guide for replenishing liquid into another filling cavity after overflow from the filling cavity.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. When the hydraulic pump is working normally, the hydraulic oil circulates between the pump body and the system through the oil delivery pipe, and some oil flows back and forth through the return pipe. At this time, the hydraulic oil flowing in the return pipe drives the piston ring to move, and the magnetic balls sliding on the outer wall of the piston ring move synchronously. Due to the magnetic attraction between the magnetic balls and the first magnetic ring, the first magnetic ring drives the detection housing ring to slide back and forth along the outer wall of the return pipe, realizing dynamic leakage detection of the entire section of the return pipe; 2. When a leak occurs at a point in the return pipe, the detection housing ring moves magnetically to directly above the leak. At this time, the hydraulic pressure generated by the leak acts on the rubber diaphragm, causing it to deform. This deformation pushes the lifting component upwards, which in turn drives the lifting rod and drive rod upwards. The drive rod moves within the movable groove of the rotating rod, forcing the rotating rod to rotate around its axis, thus driving the filling block to conform to the outer wall of the return pipe. The auxiliary ball at the bottom of the filling block first contacts the outer wall of the return pipe; after being compressed, the auxiliary ball contracts into the contraction groove, ensuring a tight fit between the filling block and the pipe wall. The filling cavity formed by the deformation of the rubber diaphragm temporarily stores the leaked oil. If the leakage is large, after the current filling cavity is full, the oil overflows through the inverted triangular guide joint at the filling block connection to the filling cavity of the next filling block. When all filling cavities are full, the system triggers a leak diagnosis alarm on the pump body via a pressure sensor or flow monitoring. During this process, the tight fit of the filling block effectively mitigates the risk of pipe wall rupture that may be caused by a sudden increase in pressure at the leak point, buys time for maintenance, and avoids equipment damage caused by a large leak of hydraulic oil. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the hydraulic pump for the coal mining machine of the present invention.

[0019] Figure 2 This is a schematic diagram of the overall structure of the hydraulic pump for the coal mining machine of the present invention from another angle.

[0020] Figure 3 This is a schematic diagram illustrating the leakage diagnosis status of the hydraulic pump used in the coal mining machine according to the present invention.

[0021] Figure 4 This is a schematic diagram of the reflux pipe structure of the present invention.

[0022] Figure 5 This is a cross-sectional view of the reflux pipe of the present invention.

[0023] Figure 6 This is a cross-sectional view of the leakage filling state of the return pipe structure of the present invention.

[0024] Figure 7 This is a schematic diagram of the structural leak filling diagnostic component of the present invention.

[0025] Figure 8 for Figure 5 An enlarged schematic diagram of the structure at point A.

[0026] Figure 9 for Figure 5 Enlarged schematic diagram of the structure at point B.

[0027] Figure 10 for Figure 6 A magnified schematic diagram of the structure at point C.

[0028] In the diagram: 1. Base; 2. Pump body; 3. Control terminal; 4. Oil supply pipe; 5. Return pipe; 6. Detection housing ring; 7. First magnetic ring; 8. Magnetic ball; 9. Filler block; 901. Auxiliary ball; 10. Rubber diaphragm; 11. Connecting rod; 1101. Rotating shaft; 12. Lifting component; 13. Push rod; 14. Rotating rod; 15. Movable groove. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 10 The present invention provides a technical solution: a hydraulic pump leakage diagnosis device for a coal mining machine, including a base 1, a pump body 2 disposed on the base 1, a control terminal 3 connected to the outer wall of the pump body 2, an oil delivery pipe 4 connected to the input and output terminals of the pump body 2, and a return pipe 5 disposed on the oil delivery pipe 4. It also includes a magnetic drive component slidably disposed on the return pipe 5 based on synchronous reciprocating flow with the liquid, and a leakage filling diagnosis component connected to the magnetic drive component for detecting leakage in the return pipe 5 and temporarily filling it. The magnetic drive assembly includes magnetic balls 8 arranged at equal angles within the return pipe 5 and a first magnetic ring 7 connected to the leak filling diagnostic assembly. The leak filling diagnostic assembly includes a detection shell ring 6 connected to one end of the first magnetic ring 7 and sleeved on the return pipe 5, filling blocks 9 disposed inside the detection shell ring 6 at equal angles, and a rubber membrane 10 disposed at the bottom of the filling blocks 9.

[0031] In this embodiment, hydraulic oil circulates reciprocally within the return pipe 5, driving the magnetic ball bearing 8 to move in the same direction. The magnetic ball bearing 8 is connected to the first magnetic ring 7, causing the first magnetic ring 7 to drive the detection housing ring 6 within the leak filling diagnostic component to reciprocate along the return pipe 5, detecting leaks in the return pipe 5. When a leak occurs in the return pipe 5, the filling block 9 within the detection housing ring 6 is positioned directly above the leak outlet, and the leakage pressure at the leak outlet begins to compress the rubber diaphragm 10, causing the rubber diaphragm 10 to deform under pressure. After the rubber diaphragm 10 deforms, it drives... As the filling block 9 begins to adhere to the leak, the greater the pressure, the greater the deformation of the rubber diaphragm 10, thus making the filling block 9 adhere more firmly to the outer wall of the return pipe 5. The filling cavity created by the deformation of the rubber diaphragm 10 is used to temporarily store the leaked oil. After the oil overflows from the filling cavity, it will enter the filling cavity at the bottom of the next filling block 9 until all the filling cavities are full. At this time, the leakage diagnosis alarm of the pump body 2 will also be triggered, reducing the possibility of the return pipe 5 being severely damaged due to the increased pressure caused by the pressure relief, which could lead to equipment damage.

[0032] The magnetic drive assembly also includes a piston ring disposed at the center of the magnetic ball 8. The magnetic ball 8 is slidably disposed on the outer wall of the piston ring, and the magnetic ball 8 is magnetically attracted to the first magnetic ring 7.

[0033] In this embodiment, an annular groove is formed at the axial center of the outer circumference of the piston ring. Magnetic balls 8 are arranged at equal angles within the annular groove. At both axial ends of the annular groove (i.e., the side closest to the piston ring end face), there are features to restrict the axial movement of the magnetic balls 8 along the piston ring. (Specifically, after the hydraulic pump starts, hydraulic oil enters the pump body 2 through the oil supply pipe 4 and circulates. Part of the hydraulic oil flows back and forth along the return pipe 5. The hydraulic oil in the return pipe 5 acts on the two end faces of the optimized piston ring, pushing the piston ring to move axially along the return pipe 5; at this time, the magnetic balls 8 in the annular groove on the outer wall of the piston ring...) The magnetic ball 8, due to its outer spherical surface contacting the inner wall of the return pipe 5, rolls with the piston ring as it moves (rolling friction coefficient ≤ 0.005), significantly reducing the moving resistance of the piston ring and ensuring that the hydraulic oil can easily drive the piston ring to reciprocate. Since the magnetic ball 8 (N pole) and the first magnetic ring 7 (S pole) are attracted by opposite poles, when the piston ring moves, the magnetic ball 8 pulls the first magnetic ring 7 to move synchronously, thereby driving the detection shell ring 6 to slide along the outer wall of the return pipe 5 (the auxiliary ball 901 at the bottom of the detection shell ring 6 rolls synchronously, limiting the radial displacement of the detection shell ring 6), realizing dynamic leakage detection of the entire section of the return pipe 5.

[0034] The leak filling diagnostic assembly also includes a lifting member 12 fixedly connected to the top center of the rubber diaphragm 10, connecting rods 11 fixedly connected to the inner wall of the detection housing ring 6 and symmetrically distributed, a rotating shaft 1101 fixedly connected to the end of the connecting rod 11, and a rotating rod 14 rotatably mounted on the rotating shaft 1101, one end of the rotating rod 14 being connected to the inner wall of the filling block 9.

[0035] The top of the lifting member 12 is fixedly connected with symmetrically distributed top rods 13. A drive rod is fixedly connected to one side of the top rod 13. One end of the drive rod passes through the other end of the rotating rod 14 to lift the rotating rod 14 and make it rotate.

[0036] The other end of the rotating rod 14 is provided with a movable groove 15.

[0037] The drive rod is located in the center of the movable slot 15.

[0038] In this embodiment, when the rubber diaphragm 10 is deformed under pressure, it pushes the lifting member 12 to move upward. When the lifting member 12 moves upward, it drives the top rod 13 to move upward, thereby causing the drive rod to move within the movable groove 15 and lift the rotating rod 14 to rotate. The rotation of the rotating rod 14 causes the filling block 9 to adhere to the outer wall of the return pipe 5, and the more the rubber diaphragm 10 deforms, the more firmly the filling block 9 adheres.

[0039] The bottom of the filling block 9 is slidably provided with symmetrically distributed auxiliary balls 901, the ends of which are in contact with the outer wall of the return pipe 5.

[0040] The filling block 9 has a shrinkage groove for the auxiliary ball 901 to shrink. A spring is installed in the shrinkage groove, and a connecting plate is fixedly connected to the bottom of the spring. The connecting plate is in contact with the auxiliary ball 901.

[0041] In this embodiment, the auxiliary ball 901 reduces the friction between the filling block 9 and the outer wall of the return pipe 5, allowing the detection ring 6 to move more smoothly back and forth on the return pipe 5. When the filling block 9 needs to fit against the wall of the return pipe 5, the auxiliary ball 901 first contacts the outer wall of the return pipe 5. As the filling block 9 continues to approach, the auxiliary ball 901 is squeezed and retracts into the shrinkage groove, the spring is compressed, and the connecting plate provides stable support and buffering for the auxiliary ball 901.

[0042] The rubber diaphragm 10 is deformed by leakage pressure to form a filling cavity for sealing the leak in the return pipe 5.

[0043] The joints of each filling block 9 are inverted triangles to form a flow connector for replenishing liquid into another filling cavity after it overflows from the filling cavity.

[0044] In this embodiment, the filling cavity created by the deformation of the rubber diaphragm 10 can temporarily store the leaked oil. When the oil overflows from the filling cavity, it will enter the filling cavity at the bottom of the next filling block 9 until all filling cavities are full. At this time, the leakage diagnosis alarm of the pump body 2 is triggered, which effectively reduces the possibility of the return pipe 5 being severely damaged due to the increased pressure of the pressure relief, thus reducing the risk of equipment damage.

[0045] Working principle: When using this hydraulic pump leakage diagnosis device for coal mining machines, firstly, when the hydraulic pump is working normally, the hydraulic oil circulates between the pump body 2 and the system through the oil delivery pipe 4, and part of the oil flows back and forth through the return pipe 5. At this time, the hydraulic oil flowing in the return pipe 5 drives the piston ring to move, and the magnetic ball 8 in the annular groove on the outer wall of the piston ring moves synchronously. Due to the magnetic attraction between the magnetic ball 8 and the first magnetic ring 7, the first magnetic ring 7 drives the detection housing ring 6 to slide back and forth along the outer wall of the return pipe 5, realizing dynamic leakage detection of the entire section of the return pipe 5; When a leak occurs at a point in the return pipe 5, the detection ring 6 moves to directly above the leak point under magnetic drive. At this time, the hydraulic oil pressure generated by the leak acts on the rubber diaphragm 10, causing it to deform under pressure. The deformation of the rubber diaphragm 10 pushes the lifting member 12 upward, thereby driving the lifting rod 13 and the drive rod to rise. The drive rod moves within the movable groove 15 of the rotating rod 14, forcing the rotating rod 14 to rotate around the rotating shaft 1101, thereby driving the filling block 9 to adhere to the outer wall of the return pipe 5; the auxiliary ball 901 set at the bottom of the filling block 9 first contacts the outer wall of the return pipe 5, and after being squeezed, the auxiliary ball 901 retracts into the shrinkage groove (the spring provides cushioning), ensuring that the filling block 9 is tightly adhered to the pipe wall. At this time, the filling cavity formed by the deformation of the rubber diaphragm 10 temporarily stores the leaked oil. If the leakage is large, after the current filling cavity is full, the oil overflows through the inverted triangular guide joint at the connection of the filling block 9 to the filling cavity of the next filling block 9, realizing multi-stage temporary storage; When all filling chambers are fully loaded, the system triggers a leak diagnosis alarm on pump body 2 via pressure sensors or flow monitoring. During this process, the tight fit of filling block 9 effectively mitigates the risk of pipe wall rupture that may be caused by a sudden increase in pressure at the leak point, buying time for maintenance and preventing equipment damage caused by a large leak of hydraulic oil.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A leakage diagnosis device for a hydraulic pump used in a coal mining machine, comprising a base (1), a pump body (2) mounted on the base (1), a control terminal (3) with a sensor connected to the outer wall of the pump body (2), an oil delivery pipe (4) connected to the input and output terminals of the pump body (2), and a return pipe (5) mounted on the oil delivery pipe (4), characterized in that: It also includes a magnetic drive assembly that is slidably disposed on the return pipe (5) based on synchronous reciprocating flow with the liquid, and a leak filling diagnostic assembly connected to the magnetic drive assembly for detecting and temporarily filling leaks in the return pipe (5); The magnetic drive assembly includes magnetic balls (8) arranged at equal angles inside the return pipe (5) and a first magnetic ring (7) connected to the leak filling diagnostic assembly. The leak filling diagnostic component includes a detection shell ring (6) connected to one end of the first magnetic ring (7) and sleeved on the return pipe (5), filling blocks (9) arranged at equal angles inside the detection shell ring (6), and a rubber membrane (10) arranged at the bottom of the filling blocks (9).

2. The hydraulic pump leakage diagnosis device for coal mining machines according to claim 1, characterized in that: The magnetic drive assembly also includes a piston ring disposed at the center of the magnetic ball (8), the magnetic ball (8) being slidably disposed on the outer wall of the piston ring, and the magnetic ball (8) being magnetically attracted to the first magnetic ring (7).

3. The hydraulic pump leakage diagnosis device for coal mining machines according to claim 1, characterized in that: The leak filling diagnostic assembly also includes a lifting member (12) fixedly connected to the top center of the rubber diaphragm (10), a connecting rod (11) fixedly connected to the inner wall of the detection shell ring (6) and symmetrically distributed, a rotating shaft (1101) fixedly connected to the end of the connecting rod (11), and a rotating rod (14) rotatably mounted on the rotating shaft (1101), one end of the rotating rod (14) being connected to the inner wall of the filling block (9).

4. The hydraulic pump leakage diagnosis device for a coal mining machine according to claim 3, characterized in that: The top of the lifting member (12) is fixedly connected to a symmetrically distributed top rod (13), and a drive rod is fixedly connected to one side of the top rod (13). One end of the drive rod passes through the other end of the rotating rod (14) to lift the rotating rod (14) so ​​that it rotates.

5. The hydraulic pump leakage diagnosis device for a coal mining machine according to claim 4, characterized in that: The other end of the rotating rod (14) is provided with a movable groove (15).

6. The hydraulic pump leakage diagnosis device for a coal mining machine according to claim 5, characterized in that: The drive rod is disposed in the movable slot (15) and is located in the center of the movable slot (15).

7. The hydraulic pump leakage diagnosis device for a coal mining machine according to claim 1, characterized in that: The bottom of the filling block (9) is slidably provided with auxiliary balls (901) that are symmetrically distributed, and the ends of the auxiliary balls (901) are in contact with the outer wall of the return pipe (5).

8. The hydraulic pump leakage diagnosis device for a coal mining machine according to claim 7, characterized in that: The filling block (9) has a shrinkage groove for the auxiliary ball (901) to shrink. A spring is provided in the shrinkage groove. A connecting plate is fixedly connected to the bottom of the spring. The connecting plate is in contact with the auxiliary ball (901).

9. The hydraulic pump leakage diagnosis device for a coal mining machine according to claim 1, characterized in that: The rubber membrane (10) is deformed by leakage pressure into a filling cavity for sealing the leak in the return pipe (5).

10. A hydraulic pump leakage diagnosis device for a coal mining machine according to claim 9, characterized in that: The connection of each filling block (9) is inverted triangular to form a guide joint for replenishing liquid into another filling cavity after the filling cavity overflows.

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