Hydraulic pump control mechanism for engine power measurement

Abstract

The invention belongs to the technical field of hydraulic pumps, and discloses a hydraulic pump control mechanism for engine power measurement. Comprising a pump shell, a base is fixedly connected to the bottom of the pump shell, a pump shaft is rotatably connected to the inner wall of the pump shell, and a connecting plate is fixedly connected to the top end of the pump shell. The upper portion of the inner wall of the cylinder is opened in cooperation with the opening and closing assembly, after the pressure oil stops entering the mounting shell, the impurities below the first filter screen can be intercepted through the opening and closing assembly, the impurities are prevented from flowing back into the pump shell, and when the impurities accumulated in the cylinder need to be cleared away, the pressure oil can be cleared away through the opening and closing assembly. And the mounting box can be detached through the mounting assembly, so that impurities in the cylinder are taken out, and the problem that the impurities in the hydraulic oil damage the interior of the control mechanism is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pumps, and more particularly to a hydraulic pump control mechanism for engine dynamometer. Background Art

[0002] An engine dynamometer, also known as a dynamometer, is a device that measures the torque output on various power machine shafts and combines the speed to determine the output power. On an engine dynamometer, a hydraulic pump is usually used to provide stable hydraulic power to support various tests and operations of the dynamometer.

[0003] The hydraulic pump includes components such as a pump housing, an output shaft and a control mechanism. When the hydraulic pump is needed, it can be driven by an engine or an electric motor to suck oil from the hydraulic oil tank and discharge the pressurized oil to the actuator. The working principle of the hydraulic pump is based on physical and mechanical principles. It achieves liquid suction and discharge by changing the volume of the working chamber. When the volume of the working chamber increases, negative pressure is generated in the pump and the liquid is sucked in. When the volume of the working chamber decreases, positive pressure is generated in the pump and the liquid is discharged.

[0004] In the prior art, when the hydraulic pump is working, the hydraulic oil is continuously transmitted, and part of the hydraulic oil enters the interior of the control mechanism. Since the hydraulic oil is easy to wash away the impurities accumulated on the inner wall of the pump casing during the flow, there are usually some impurities in the hydraulic oil. After the hydraulic oil containing impurities enters the interior of the control mechanism, the impurities are easily trapped inside the control mechanism, which can easily cause damage to the interior of the control mechanism over time. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention proposes a hydraulic pump control mechanism for engine dynamometer.

[0006] To achieve the above object, the present invention provides the following technical solutions: a hydraulic pump control mechanism for engine dynamometer, comprising a pump housing, a base fixedly connected to the bottom of the pump housing, a pump shaft rotatably connected to the inner wall of the pump housing, a connecting plate fixedly connected to the top of the pump housing, a mounting shell fixedly connected to the top of the connecting plate, an oil inlet and an oil outlet are respectively opened in parallel inside the connecting plate, a mounting box is arranged inside the connecting plate, a cylinder is fixedly connected to the inner wall of the mounting box, and further comprising:

[0007] A rotating rod, the rotating rod is arranged inside the cylinder, a fin is fixedly connected to the bottom of the rotating rod, a first filter screen is adsorbed on the top of the cylinder through a magnet, and a filter assembly for filtering impurities in the hydraulic oil is arranged on the inner wall of the cylinder;

[0008] A spring, the spring is fixedly connected to the top of the round rod, a disc is fixedly connected to the top of the spring, the disc is slidably connected to the bottom of the first filter screen, and an opening and closing component for opening and closing the cylinder is arranged on the inner wall of the cylinder;

[0009] A fixing block, the fixing block is arranged on the inner wall of the installation box, a buckle block is fixedly connected to the inner wall of the connecting plate, two groups of the fixing blocks are arranged, and are symmetrically distributed on both sides of the buckle block, and one side of the two groups of the fixing blocks is provided with a mounting assembly for fixing the position of the installation box;

[0010] A semipermeable membrane is fixedly connected to the drive of the mounting shell, a sleeve is fixedly connected to the top of the mounting shell, a transmission rod is arranged inside the sleeve, a fan blade is fixedly connected to the outer wall of the transmission rod, and a separation component for separating air in the hydraulic oil is arranged at the top of the mounting shell.

[0011] Furthermore, the filter assembly also includes fins, which are fixedly connected to the bottom of the rotating rod, and the fins are arranged at the top of the oil inlet. The inner wall of the cylinder is fixedly connected to a baffle, and a plurality of groups of inclined grooves are opened at the top of the baffle. The rotating rod is rotatably connected to the center of the baffle, and the outer wall of the rotating rod is fixedly connected to an L-shaped block, and the end of the L-shaped block away from the rotating rod is fixedly connected to a closing plate, and a slope is arranged at the bottom of the closing plate. There are multiple groups of L-shaped blocks and closing plates, which are distributed in a circle on the outer wall of the rotating rod, and multiple groups of closing plates are arranged inside the inclined grooves. The top and bottom of the cylinder are fixedly connected to sealing gaskets, and the two groups of sealing gaskets are both fitted to the inner wall of the connecting plate.

[0012] Furthermore, the opening and closing assembly also includes a rotating block, which is rotatably connected to the outer wall of the rotating rod, and a push plate is fixedly connected to the outer wall of the rotating block. The push plate is arranged at the bottom of the closing plate, and a through hole is provided at the bottom of the push plate. A limiting groove is provided on the inner wall of the cylinder, and a limiting block is fixedly connected to the outer wall of the push plate. The limiting block is slidably connected to the bottom of the limiting groove, and a pull block is fixedly connected to the top of the first filter.

[0013] Furthermore, the mounting assembly also includes a threaded rod, which is rotatably connected to one side of the mounting box, a screw block is fixedly connected to one end of the threaded rod away from the mounting box, and a round rod is threadedly connected to one end of the threaded rod extending into the inner wall of the mounting box, and a limiting rod is fixed to the inner wall of the mounting box, a limiting hole is provided on the top of the fixing block, and the fixing block is rotatably connected to the outer wall of the limiting rod through the limiting hole, one side of the bottom of the fixing block is arc-shaped, the round rod is arranged between two groups of fixing blocks, and a handle is fixedly connected to one side of the mounting box.

[0014] Furthermore, the separation assembly also includes a first bevel gear, which is fixedly connected to the outer wall of the pump shaft, the top of the first bevel gear is meshed with a second bevel gear, the top of the second bevel gear is fixedly connected to a vertical rod, one side of the pump housing is fixedly connected to a hoop, the vertical rod is arranged on the inner wall of the hoop, the top of the vertical rod is fixedly connected to a first pulley, the outer wall of the first pulley is sleeved with a transmission belt, the other side of the inner wall of the transmission belt is sleeved with a second pulley, and the transmission rod is fixedly connected to the bottom of the second pulley.

[0015] Furthermore, a cover shell is fixedly connected to the top end of the sleeve, the cover shell is sleeved on the outer wall of the transmission belt, a second filter screen is fixedly connected to the inner wall of the sleeve, and the transmission rod passes through the second filter screen.

[0016] The technical effects and advantages of the engine dynamometer hydraulic pump control mechanism of the present invention are as follows:

[0017] (1) When in use, the pressure oil enters the cylinder through the oil inlet, and the flow of hydraulic oil drives the fins and the rotating rod to rotate, and the rotating rod drives the filter assembly to move, so that impurities in the pressure oil can be collected, and the upper part of the inner wall of the cylinder can be opened in cooperation with the opening and closing assembly. After the pressure oil stops entering the installation shell, the impurities under the first filter can be intercepted by the opening and closing assembly to prevent the impurities from flowing back into the pump shell. When it is necessary to clean the impurities accumulated in the cylinder, the installation box can be disassembled through the installation assembly to remove the impurities in the cylinder, thereby solving the problem that the impurities in the hydraulic oil will cause damage to the control mechanism.

[0018] (2) By setting up a separation component, after the pressure oil enters the mounting shell, the separation component can drive the fan blades to rotate and generate an upward suction force inside the sleeve. Since the mass of the air in the pressure oil is less than that of the pressure oil, it will float on the top of the inner wall of the mounting shell. Subsequently, the suction force in the sleeve can make the air in the mounting shell pass through the semipermeable membrane and move to the outside of the mounting shell, thereby separating the air in the pressure oil, preventing the wear inside the pump shell from being aggravated, and preventing the noise caused by air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0021] Figure 3 for Figure 2 A is an enlarged structural diagram of FIG.

[0022] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at B.

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the rotating rod in the present invention.

[0024] Figure 6 It is a schematic diagram of the installation box structure in the present invention.

[0025] Figure 7 It is a schematic diagram of the cross-sectional structure of the connecting plate in the present invention.

[0026] Figure 8 for Figure 7 Enlarged schematic diagram of point C.

[0027] Fig. 9 It is a schematic diagram of the fixed block structure in the present invention.

[0028] Fig.10 It is a partial schematic diagram of the separation component in the present invention.

[0029] Fig.11 It is a schematic diagram of the sleeve explosion in the present invention.

[0030] In the figure:

[0031] 1. Pump housing; 2. Base; 3. Pump shaft; 4. Connecting plate; 5. Mounting housing; 6. Mounting box; 7. Cylinder; 8. First filter screen; 9. Rotating rod; 10. Oil inlet; 11. Oil outlet; 12. Sealing gasket; 13. Baffle; 14. L-shaped block; 15. Closing plate; 16. Fin; 17. Rotating block; 18. Pushing plate; 19. Limiting groove; 20. Limiting block; 21. Pulling block; 22. Spring; 23 , threaded rod; 24, screw block; 25, round rod; 26, fixed block; 27, limit rod; 28, snap-fit ​​block; 29, first bevel gear; 30, second bevel gear; 31, vertical rod; 32, hoop; 33, first pulley; 34, transmission belt; 35, second pulley; 36, transmission rod; 37, fan blade; 38, sleeve; 39, semipermeable membrane; 40, second filter; 41, cover; 42, handle. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] Reference Figure 1-11, comprising a pump housing 1, a base 2 being fixedly connected to the bottom of the pump housing 1, a pump shaft 3 being rotatably connected to the inner wall of the pump housing 1, a connecting plate 4 being fixedly connected to the top of the pump housing 1, a mounting shell 5 being fixedly connected to the top of the connecting plate 4, an oil inlet 10 and an oil outlet 11 being respectively opened in parallel inside the connecting plate 4, a mounting box 6 being arranged inside the connecting plate 4, a cylinder 7 being fixedly connected to the inner wall of the mounting box 6, and further comprising:

[0035] A rotating rod 9, the rotating rod 9 is arranged inside the cylinder 7, a fin 16 is fixedly connected to the bottom of the rotating rod 9, a first filter screen 8 is adsorbed on the top of the cylinder 7 through a magnet, and a filter assembly for filtering impurities in the hydraulic oil is arranged on the inner wall of the cylinder 7;

[0036] A spring 22, the spring 22 is fixedly connected to the top of the round rod 25, a disc is fixedly connected to the top of the spring 22, and the disc is slidably connected to the bottom of the first filter 8, and an opening and closing component for opening and closing the cylinder 7 is provided on the inner wall of the cylinder 7;

[0037] A fixing block 26, the fixing block 26 is arranged on the inner wall of the installation box 6, and a buckle block 28 is fixedly connected to the inner wall of the connecting plate 4. Two groups of the fixing blocks 26 are arranged and symmetrically distributed on both sides of the buckle block 28. One side of the two groups of the fixing blocks 26 is provided with a mounting assembly for fixing the position of the installation box 6;

[0038] The semipermeable membrane 39 is fixedly connected to the drive of the mounting shell 5. The top of the mounting shell 5 is fixedly connected with a sleeve 38. A transmission rod 36 is arranged inside the sleeve 38. The outer wall of the transmission rod 36 is fixedly connected with a fan blade 37. The top of the mounting shell 5 is provided with a separation component for separating the air in the hydraulic oil.

[0039] In order to solve the problem that impurities in the hydraulic oil may cause damage to the control mechanism, when the hydraulic pump is needed, the hydraulic pump can be started to rotate the pump shaft 3 in the pump housing 1. When the pump shaft 3 rotates, the pressure oil will enter the mounting housing 5 through the oil inlet 10 and flow out through the oil outlet 11. When the pressure oil enters the cylinder 7, the fins 16 will be driven to rotate to one side by the flow of hydraulic oil. When the four sets of fins 16 rotate, the rotating rod 9 will be driven to rotate. When the rotating rod 9 rotates, it will drive the filter assembly to move, so that the impurities in the pressure oil can be collected, and the upper part of the inner wall of the cylinder 7 can be opened by cooperating with the opening and closing assembly. After the pressure oil stops entering the mounting housing 5, the impurities below the first filter screen 8 can be removed by the opening and closing assembly. The impurities can be intercepted to prevent them from flowing back into the pump casing 1. By setting up the installation component, the installation box 6 can be disassembled when it is necessary to clean the impurities accumulated in the cylinder 7, so that the impurities in the cylinder 7 can be taken out. By setting up the separation component, after the pressure oil enters the installation shell 5, the fan blade 37 can be driven to rotate by the separation component, and an upward suction force is generated inside the sleeve 38. Since the mass of the air in the pressure oil is less than that of the pressure oil, it will float on the top of the inner wall of the installation shell 5. Subsequently, the suction force in the sleeve 38 can be used to make the air in the installation shell 5 pass through the semipermeable membrane 39 and move to the outside of the installation shell 5, so that the air in the pressure oil can be separated, thereby preventing the wear in the pump casing 1 from being aggravated and preventing the noise caused by air flow.

[0040] Reference Figure 3-5 The filter assembly also includes a fin 16, which is fixedly connected to the bottom of the rotating rod 9 and arranged at the top of the oil inlet 10. A baffle 13 is fixedly connected to the inner wall of the cylinder 7, and a plurality of groups of inclined grooves are provided at the top of the baffle 13. The rotating rod 9 is rotatably connected to the center of the baffle 13. An L-shaped block 14 is fixedly connected to the outer wall of the rotating rod 9, and a closing plate 15 is fixedly connected to the end of the L-shaped block 14 away from the rotating rod 9. A slope is arranged at the bottom of the closing plate 15. There are multiple groups of L-shaped blocks 14 and closing plates 15, which are distributed circumferentially on the outer wall of the rotating rod 9. Multiple groups of closing plates 15 are arranged inside the inclined groove. The top and bottom of the cylinder 7 are fixedly connected to sealing gaskets 12, and two groups of sealing gaskets 12 are both fitted to the inner wall of the connecting plate 4.

[0041] When the pressure oil flows toward the oil inlet 10, it will impact the fin 16, causing the fin 16 to rotate. When the fin 16 rotates, it will drive the rotating rod 9 to rotate. When the rotating rod 9 rotates, it will drive the L-shaped block 14 on one side to rotate. When the L-shaped block 14 rotates, it will drive the closing plate 15 at the bottom to rotate together. When the closing plate 15 rotates, the opening and closing assembly can move the closing plate 15 out of the inclined groove at the top of the baffle 13, so that the pressure oil can flow upward through the inclined groove on the baffle 13. When the pressure oil flows to the bottom of the first filter screen 8, it will be filtered by the first filter screen 8, so that Impurities are trapped at the bottom of the first filter 8. At the same time, as the pressure oil continues to flow upward, the impurities are pushed and kept at the bottom of the first filter 8. By arranging a sealing gasket 12 at the top and bottom of the cylinder 7, a sealing effect can be provided to the top and bottom of the cylinder 7 to prevent the pressure oil from leaking. When the pressure oil stops flowing, the opening and closing assembly can be used to move the rotating rod 9, the fin 16, the L-shaped block 14 and the closing plate 15 downward until the closing plate 15 slides into the inclined groove set on the baffle 13, so that the impurities can be trapped between the baffle 13 and the first filter 8 to prevent the impurities from falling back into the pump housing 1.

[0042] Reference Figure 3-5 The opening and closing assembly also includes a rotating block 17, which is rotatably connected to the outer wall of the rotating rod 9, and a push plate 18 is fixedly connected to the outer wall of the rotating block 17. The push plate 18 is arranged at the bottom of the closing plate 15, and a through hole is provided at the bottom of the push plate 18. A limiting groove 19 is provided on the inner wall of the cylinder 7, and a limiting block 20 is fixedly connected to the outer wall of the push plate 18. The limiting block 20 is slidably connected to the bottom of the limiting groove 19, and a pull block 21 is fixedly connected to the top of the first filter screen 8.

[0043] When the pressure oil enters the oil inlet 10, the push plate 18 can be pushed upward by the upward impact force of the pressure oil. The through hole set on the push plate 18 allows the pressure oil to pass through the push plate 18. When the push plate 18 moves upward, the rotating block 17 can drive the rotating rod 9, the fin 16, the L-shaped block 14 and the closing plate 15 to move upward without hindering the rotation of the rotating rod 9. When the push plate 18 moves upward, the limit block 20 set on one side of the push plate 18 will be driven to slide in the limit groove 19, thereby limiting the movement trajectory of the push plate 18. When the rotating rod 9 rotates, the spring 22 at the top and the disc will be driven to rotate at the bottom of the first filter screen 8. When the pressure oil stops entering the oil inlet 10, the spring 22 will lose its upward driving force, and the rotating rod 9, the fin 16, the pushing plate 18, the L-shaped block 14 and the closing plate 15 can be pushed downward by the thrust of the spring 22 returning to its original position, and the slope provided at the bottom of the closing plate 15 can help the closing plate 15 slide into the inclined groove, so that the inclined groove can be closed by the closing plate 15 to prevent impurities from falling downward. When cleaning the impurities under the first filter 8, the pull block 21 at the top of the first filter 8 can be pulled to remove the first filter 8 from the magnet, and the impurities can be cleaned, and then the first filter 8 can be reinstalled on the magnet so that the first filter 8 is adsorbed by the magnet.

[0044] Reference Figure 6-9 The installation assembly also includes a threaded rod 23, which is rotatably connected to one side of the installation box 6. A screw block 24 is fixedly connected to one end of the threaded rod 23 away from the installation box 6. One end of the threaded rod 23 extending into the inner wall of the installation box 6 is threadedly connected to a round rod 25. The inner wall of the installation box 6 is fixedly connected to a limiting rod 27. A limiting hole is provided at the top of the fixing block 26. The fixing block 26 is rotatably connected to the outer wall of the limiting rod 27 through the limiting hole. One side of the bottom of the fixing block 26 is in an arc shape. The round rod 25 is arranged between two groups of fixing blocks 26. A handle 42 is fixedly connected to one side of the installation box 6.

[0045] When the installation box 6 needs to be taken out from the connecting plate 4, the screw block 24 can be rotated to make the screw block 24 drive the threaded rod 23 to rotate. When the threaded rod 23 rotates, the round rod 25 with one side threadedly connected will move to the side away from the screw block 24. Since one side of the two sets of fixing blocks 26 is in an arc shape, the round rod 25 will push the two sets of fixing blocks 26 to move when it moves. By setting two sets of limiting rods 27, the two sets of fixing blocks 26 can only rotate around the limiting rods 27, so that the two sets of fixing blocks 26 are moved away from the two ends of the buckling blocks 28. It is convenient to take out the installation box 6 by pulling the handle 42, and then the pull block 21 at the top of the first filter 8 can be pulled to remove the first filter 8 from the magnet to clean the impurities. After cleaning, the installation box 6 is put back into the interior of the connecting plate 4, and the threaded rod 23 is rotated in the opposite direction, so that the threaded rod 23 drives the round rod 25 to move toward one side of the screw block 24 when rotating, so that the two groups of fixing blocks 26 rotate toward the center until one end of the two groups of fixing blocks 26 is stuck on one side of the buckle block 28, so that the installation box 6 can be reinstalled inside the connecting plate 4.

[0046] Reference Figure 10-11 The separation assembly also includes a first bevel gear 29, which is fixedly connected to the outer wall of the pump shaft 3, and the top of the first bevel gear 29 is meshed with a second bevel gear 30, and the top of the second bevel gear 30 is fixedly connected to a vertical rod 31, and a hoop 32 is fixedly connected to one side of the pump housing 1, and the vertical rod 31 is arranged on the inner wall of the hoop 32, and the top of the vertical rod 31 is fixedly connected to a first pulley 33, and the outer wall of the first pulley 33 is sleeved with a transmission belt 34, and the other side of the inner wall of the transmission belt 34 is sleeved with a second pulley 35, and the transmission rod 36 is fixedly connected to the bottom of the second pulley 35.

[0047] When the pump shaft 3 rotates, the first bevel gear 29 arranged on the outer wall can be driven to rotate, and when the first bevel gear 29 rotates, the second bevel gear 30 meshed at the top will be driven to rotate, and when the second bevel gear 30 rotates, the vertical rod 31 and the first pulley 33 at the top will be driven to rotate. The position of the vertical rod 31 can be fixed by setting the hoop 32, and when the first pulley 33 rotates, the transmission belt 34 arranged on the outer wall will be driven to rotate, and the transmission belt 34 will drive the second pulley 35 to rotate. When the second pulley 35 rotates, the transmission rod 36 and the fan blade 37 at the bottom will be driven to rotate together. Since the fan blade 37 is arranged inside the sleeve 38, the upward suction force will be generated when the fan blade 37 rotates, and the semipermeable membrane 39 arranged at the top of the mounting shell 5 can allow air to pass through and block the pressure oil. Therefore, with the suction force generated by the fan blade 37, the air in the mounting shell 5 can be accelerated to pass through the semipermeable membrane 39, so as to prevent the air in the pressure oil from affecting the operation of the hydraulic pump.

[0048] Reference Fig.11A cover shell 41 is fixedly connected to the top of the sleeve 38 , and the cover shell 41 is sleeved on the outer wall of the transmission belt 34 . A second filter screen 40 is fixedly connected to the inner wall of the sleeve 38 , and the transmission rod 36 passes through the second filter screen 40 .

[0049] By setting a cover 41 at the top of the sleeve 38, the transmission belt 34 and the first pulley 33 and the second pulley 35 can be protected. By setting a second filter 40 at the top of the sleeve 38, the second filter 40 can prevent impurities from falling into the sleeve 38, and when the fan blades 37 suck air upward, impurities in the mesh of the second filter 40 can be blown out upward.

[0050] Working principle: In order to solve the problem that impurities in the hydraulic oil may cause damage to the control mechanism, when the hydraulic pump is needed, the hydraulic pump can be started to rotate the pump shaft 3 in the pump housing 1. When the pump shaft 3 rotates, the pressure oil will enter the mounting housing 5 through the oil inlet 10 and flow out through the oil outlet 11. When the pressure oil enters the cylinder 7 through the oil inlet 10, the upward impact force of the pressure oil will push the push plate 18 upward. The through hole set on the push plate 18 allows the pressure oil to pass through the push plate 18. When the push plate 18 moves upward, the rotating block 17 can be used to drive the rotating rod 9, the fin 16, the L-shaped block 14 and the closing plate 15 to move upward without hindering the rotation of the rotating rod 9. When the push plate 18 moves upward, it will drive one side of the push plate 18 The limit block 20 is set to slide in the limit groove 19, so as to limit the moving trajectory of the push plate 18. When the closing plate 15 moves upward, it will move upward out of the inclined groove on the baffle 13. When the pressure oil moves upward, it will also impact the fin 16, causing the fin 16 to rotate. When the fin 16 rotates, it will drive the rotating rod 9, the L-shaped block 14, and the closing plate 15 to rotate together. When the rotating rod 9 rotates, it will drive the spring 22 and the disc at the top to rotate at the bottom of the first filter 8. When the closing plate 15 rotates, it will break away from the inclined groove, so that the pressure oil can flow upward through the inclined groove on the baffle 13. When the pressure oil flows to the bottom of the first filter 8, it will be filtered by the first filter 8, so that impurities are trapped at the bottom of the first filter 8. Since the pressure oil continuously flows upward, the impurities are pushed and held at the bottom of the first filter screen 8. By arranging the sealing pad 12 at the top and bottom of the cylinder 7, a sealing effect can be provided for the top and bottom of the cylinder 7 to prevent the pressure oil from leaking out. When the pressure oil stops flowing, the spring 22 loses its upward pushing force. The rotating rod 9, the fin 16, the pushing plate 18, the L-shaped block 14 and the closing plate 15 can be pushed downward by the thrust of the spring 22 returning to its original position. The slope arranged at the bottom of the closing plate 15 can help the closing plate 15 slide into the inclined groove, so that the inclined groove can be closed by the closing plate 15 to prevent the impurities from falling downward. When cleaning the impurities under the first filter screen 8, the pull block 21 at the top of the first filter screen 8 can be pulled to make the first filter screen 8 When the first filter screen 8 is removed from the magnet, the impurities can be cleaned, and then the first filter screen 8 can be reinstalled on the magnet so that the first filter screen 8 is attracted by the magnet. When the installation box 6 needs to be taken out from the connecting plate 4, the screw block 24 can be rotated to make the screw block 24 drive the threaded rod 23 to rotate. When the threaded rod 23 rotates, the round rod 25 with one side threadedly connected will move to the side away from the screw block 24. Since one side of the two groups of fixing blocks 26 is in an arc shape, the round rod 25 will push the two groups of fixing blocks 26 to move when it moves. By setting two groups of limiting rods 27, the two groups of fixing blocks 26 can only rotate around the limiting rods 27, so that the two groups of fixing blocks 26 are moved away from the two ends of the buckling block 28, so that the installation box 6 can be taken out by pulling the handle 42.Then, the pull block 21 at the top of the first filter screen 8 can be pulled to remove the first filter screen 8 from the magnet to clean the impurities. After cleaning, the installation box 6 is put back into the interior of the connecting plate 4, and the threaded rod 23 is rotated in the opposite direction. When the threaded rod 23 rotates, the round rod 25 is driven to move to one side of the screw block 24, so that the two sets of fixing blocks 26 are rotated toward the center until one end of the two sets of fixing blocks 26 is stuck on one side of the snap-fit ​​block 28, so that the installation box 6 can be reinstalled in the interior of the connecting plate 4. When the pump shaft 3 rotates, the first bevel gear 29 set on the outer wall can be driven to rotate, and when the first bevel gear 29 rotates, it will drive the second bevel gear 30 meshing at the top to rotate. When the second bevel gear 30 rotates, it will drive the top vertical rod 31 and the first pulley 33 to rotate. The position of the vertical rod 31 can be fixed by setting the hoop 32, and when the first pulley 33 rotates, it will drive the transmission belt 3 set on the outer wall. 4 rotates, and the transmission belt 34 drives the second pulley 35 to rotate. When the second pulley 35 rotates, the transmission rod 36 and the fan blade 37 at the bottom will be driven to rotate together. Since the fan blade 37 is arranged inside the sleeve 38, an upward suction force will be generated when the fan blade 37 rotates. The semi-permeable membrane 39 arranged at the top of the mounting shell 5 can allow air to pass through and block the pressure oil. Therefore, with the suction force generated by the fan blade 37, the air in the mounting shell 5 can be accelerated to pass through the semi-permeable membrane 39, preventing the air in the pressure oil from affecting the operation of the hydraulic pump. By arranging a cover 41 at the top of the sleeve 38, the transmission belt 34 and the first pulley 33 and the second pulley 35 can be protected. By arranging a second filter 40 at the top of the sleeve 38, the second filter 40 can be used to prevent impurities from falling into the sleeve 38. When the fan blade 37 sucks air upward, the impurities in the mesh of the second filter 40 can be blown out upward.

[0051] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A hydraulic pump control mechanism for engine dynamometer, comprising a pump housing (1), the bottom of the pump housing (1) being fixedly connected to a base (2), the inner wall of the pump housing (1) being rotatably connected to a pump shaft (3), the top of the pump housing (1) being fixedly connected to a connecting plate (4), the top of the connecting plate (4) being fixedly connected to a mounting shell (5), the interior of the connecting plate (4) being provided with an oil inlet (10) and an oil outlet (11) in parallel, the interior of the connecting plate (4) being provided with a mounting box (6), the inner wall of the mounting box (6) being fixedly connected to a cylinder (7), characterized in that: Also includes: A rotating rod (9), the rotating rod (9) is arranged inside the cylinder (7), a fin (16) is fixedly connected to the bottom of the rotating rod (9), a first filter screen (8) is adsorbed on the top of the cylinder (7) by a magnet, and a filter assembly for filtering impurities in the hydraulic oil is arranged on the inner wall of the cylinder (7); A spring (22), the spring (22) is fixedly connected to the top of the round rod (25), a disc is fixedly connected to the top of the spring (22), the disc is slidably connected to the bottom of the first filter (8), and an opening and closing component for opening and closing the cylinder (7) is provided on the inner wall of the cylinder (7); A fixing block (26), the fixing block (26) being arranged on the inner wall of the installation box (6), the inner wall of the connecting plate (4) being fixedly connected with a snap-fit ​​block (28), the fixing blocks (26) being arranged in two groups and being symmetrically distributed on both sides of the snap-fit ​​block (28), and a mounting assembly for fixing the position of the installation box (6) being arranged on one side of the two groups of fixing blocks (26); A semipermeable membrane (39) is fixedly connected to the drive of the mounting shell (5), a sleeve (38) is fixedly connected to the top of the mounting shell (5), a transmission rod (36) is arranged inside the sleeve (38), a fan blade (37) is fixedly connected to the outer wall of the transmission rod (36), and a separation component for separating air in hydraulic oil is arranged at the top of the mounting shell (5).

2. The engine dynamometer hydraulic pump control mechanism according to claim 1, characterized in that: The filter assembly further comprises a fin (16), the fin (16) being fixedly connected to the bottom of the rotating rod (9), the fin (16) being arranged at the top of the oil inlet (10), the inner wall of the cylinder (7) being fixedly connected to a baffle (13), the top of the baffle (13) being provided with a plurality of groups of inclined grooves, the rotating rod (9) being rotatably connected to the center of the baffle (13), the outer wall of the rotating rod (9) being fixedly connected to an L-shaped block (14), the L-shaped block (14) being ) is fixedly connected to one end away from the rotating rod (9), and a slope is arranged at the bottom of the closing plate (15). The L-shaped blocks (14) and the closing plates (15) are arranged in multiple groups and are distributed in a circle on the outer wall of the rotating rod (9). The multiple groups of closing plates (15) are arranged inside the inclined groove. The top and bottom of the cylinder (7) are fixedly connected to sealing gaskets (12), and the two groups of sealing gaskets (12) are both attached to the inner wall of the connecting plate (4).

3. The engine dynamometer hydraulic pump control mechanism according to claim 2, characterized in that: The opening and closing assembly also includes a rotating block (17), the rotating block (17) is rotatably connected to the outer wall of the rotating rod (9), the outer wall of the rotating block (17) is fixedly connected to a push plate (18), the push plate (18) is arranged at the bottom of the closing plate (15), the bottom of the push plate (18) is provided with a through hole, the inner wall of the cylinder (7) is provided with a limiting groove (19), the outer wall of the push plate (18) is fixedly connected to a limiting block (20), the limiting block (20) is slidably connected to the bottom of the limiting groove (19), and the top end of the first filter screen (8) is fixedly connected to a pulling block (21).

4. The engine dynamometer hydraulic pump control mechanism according to claim 3, characterized in that: The installation assembly further comprises a threaded rod (23), wherein the threaded rod (23) is rotatably connected to one side of the installation box (6), an end of the threaded rod (23) away from the installation box (6) is fixedly connected to a screw block (24), an end of the threaded rod (23) extending into the inner wall of the installation box (6) is threadedly connected to a round rod (25), the inner wall of the installation box (6) is fixedly connected to a limit rod (27), a limit hole is provided at the top end of the fixed block (26), the fixed block (26) is rotatably connected to the outer wall of the limit rod (27) through the limit hole, one side of the bottom of the fixed block (26) is in an arc shape, the round rod (25) is arranged between two groups of fixed blocks (26), and a handle (42) is fixedly connected to one side of the installation box (6).

5. The engine dynamometer hydraulic pump control mechanism according to claim 4, characterized in that: The separation assembly further comprises a first bevel gear (29), the first bevel gear (29) being fixedly connected to the outer wall of the pump shaft (3), the top end of the first bevel gear (29) being meshed with a second bevel gear (30), the top end of the second bevel gear (30) being fixedly connected to a vertical rod (31), a hoop (32) being fixedly connected to one side of the pump housing (1), the vertical rod (31) being arranged on the inner wall of the hoop (32), the top end of the vertical rod (31) being fixedly connected to a first pulley (33), the outer wall of the first pulley (33) being sleeved with a transmission belt (34), the other side of the inner wall of the transmission belt (34) being sleeved with a second pulley (35), and the transmission rod (36) being fixedly connected to the bottom of the second pulley (35).

6. The engine dynamometer hydraulic pump control mechanism according to claim 5, characterized in that: A cover shell (41) is fixedly connected to the top end of the sleeve (38), and the cover shell (41) is sleeved on the outer wall of the transmission belt (34). A second filter screen (40) is fixedly connected to the inner wall of the sleeve (38), and the transmission rod (36) passes through the second filter screen (40).

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