Self-adaptive flow regulation type hydraulic pump and control method thereof

Abstract

The invention relates to the technical field of hydraulic pumps, in particular to a self-adaptive flow adjusting type hydraulic pump and a control method thereof.The self-adaptive flow adjusting type hydraulic pump comprises a hydraulic pump shell, a transmission part, a plunger, a pump container and a rear end cover, the transmission part is installed on the inner side of one end of the hydraulic pump shell, the pump container is installed at one end of the transmission part, and the plunger is installed on the inner side of the pump container; the sealing ring is provided with a rear end cover, and one side of the plunger is provided with an adjusting assembly. The adjusting assembly comprises an inclined plate, connecting shafts are welded and fixed to the upper end and the lower end of the inclined plate, and first comb tooth grooves are formed in the outer sides of the connecting shafts. The dynamic response speed and the static precision of flow control are obviously improved; and meanwhile, high precision and high stability of flow output in the full life cycle are ensured, and therefore synchronous rising of the adjusting performance and reliability of the hydraulic system is achieved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic pump technology, specifically to an adaptive flow regulating hydraulic pump and its control method. Background Technology

[0002] The adaptive flow regulating hydraulic piston pump is a variable pump that can adjust the output flow in real time according to changes in system load. It senses parameters such as pressure and flow through an electronic control system and automatically adjusts the swashplate tilt angle or piston stroke to achieve stepless variable flow. It avoids the energy waste caused by traditional overflow and is widely used in fields such as aviation and engineering machinery where high efficiency and response speed are required. Hydraulic pumps that regulate flow by automatically adjusting the swashplate angle suffer from delayed adjustment response and dead zones due to mechanical backlash and elastic deformation of the variable mechanism, resulting in decreased control accuracy. Furthermore, the swashplate and slipper assembly are prone to uneven wear under non-ideal operating conditions, affecting not only lifespan but also introducing flow errors. Therefore, to address these issues, an adaptive flow-regulating hydraulic pump and its control method are proposed. Summary of the Invention

[0003] The purpose of this invention is to provide an adaptive flow regulating hydraulic pump and its control method, in order to solve the problems of hydraulic pumps that regulate flow by automatically adjusting the swashplate angle, which suffer from delayed adjustment response and dead zone due to mechanical clearance and elastic deformation of the variable mechanism, resulting in decreased control accuracy; at the same time, the swashplate and slipper assembly are prone to uneven wear under non-ideal working conditions, which not only affects the service life but also introduces flow error.

[0004] To achieve the above objectives, the present invention provides the following technical solution: An adaptive flow-regulating hydraulic pump and its control method are disclosed, comprising a hydraulic pump housing, a transmission component, a plunger, a pump chamber, and a rear end cover. The transmission component is mounted on the inner side of one end of the hydraulic pump housing, and the pump chamber is mounted on the other end of the transmission component. The plunger is mounted on the inner side of the pump chamber. The rear end cover is mounted on the rear end of the hydraulic pump housing via bolts and a sealing ring. An adjustment assembly is mounted on one side of the plunger. The adjustment assembly includes a ramp, with connecting shafts welded to both the upper and lower ends of the ramp. A first comb-tooth groove is formed on the outer side of the connecting shaft. An angle sensor for measuring the tilt angle of the ramp is mounted on the bottom end of the lower connecting shaft. A hexagonal prism is inserted into the inner side of the upper end of the upper connecting shaft. A connecting assembly is fixedly connected to the upper end of the hexagonal prism. A compensation unit is installed inside the connecting assembly. A drive component is mounted on the upper end of the connecting assembly, and the other end of the drive component is fixedly connected to the drive shaft of a frameless torque motor. The frameless torque motor housing is mounted on the upper end of the hydraulic pump housing via bolts.

[0005] As a further optimization of the present invention, it also includes a controller for receiving the desired sloping plate angle command and the sloping plate prediction compensation angle command.

[0006] As a further optimization of the present invention, the hydraulic pump housing includes a shell, the shell having a vertically formed perforation and a horizontally formed internal assembly cavity, the shell being rotatably connected to a connecting shaft through the perforation, and the first comb groove being located inside the perforation.

[0007] As a further optimization of the present invention, the compensation unit includes two oil pipes, one end of which is fixedly connected to the cylindrical shell. Both ends of the cylindrical shell are fixedly connected to positioning plates. An internal motor is fixedly connected to the inner side of one of the positioning plates. An adjusting rod is fixedly connected to the top of the main shaft of the internal motor. A piston plate is spirally connected to the outer side of the adjusting rod. Positioning blocks are fixedly connected to the upper and lower ends of the piston plate. The positioning blocks are slidably connected to a groove opened inside the cylindrical shell.

[0008] As a further optimization of the present invention, the positioning plate has a perforation in an annular shape inside, the end of the adjusting rod away from the internal motor is rotatably connected to the positioning plate, and the positioning plate, the adjusting rod and the piston plate are coaxially arranged.

[0009] As a further optimization of the present invention, the connecting component includes a column rod, the column rod having a mounting hole in the middle, an upper cavity and an oil hole at the upper end of the column rod, a second comb tooth groove inside the upper cavity, and a fixing baffle installed on one side inside the upper cavity.

[0010] As a further optimization of the present invention, two oil holes are provided, the oil holes are connected through the upper cavity, and an oil pipe is installed at the location of the oil hole.

[0011] As a further optimization of the present invention, the cylindrical shell is installed in the middle of the mounting hole, and the center points of the cylindrical shell, the hexagonal prism, the connecting assembly and the connecting shaft are arranged on the same vertical line.

[0012] As a further optimization of the present invention, the driving component includes a driving shaft, the driving shaft is stepped, an adjusting block is fixedly connected to one side of the bottom end of the driving shaft, the adjusting block is rotatably connected to the inner wall of the upper cavity, and the driving shaft is rotatably connected to a fixed baffle.

[0013] As a further optimization of the present invention, it includes the following steps: Step 1: The controller receives the pressure signal required by the hydraulic pump and the initial signal from the internal control components, and generates corresponding instructions to control the operation of the internal control components of the hydraulic pump; Step 2: Adjust the angle of the inclined plate according to the required output pressure of the hydraulic pump: The adjustment is achieved by driving the drive components, connecting components, and hexagonal prism to rotate via a frameless torque motor, which in turn drives the connecting shaft to rotate to a predetermined position. Step 3: Based on the operating time of the hydraulic pump, predict the wear degree of the inclined plate, issue control commands to make the compensation unit run and perform compensation; During the compensation process, the internal motor drives the piston plate to adjust the volume of the hydraulic oil stored in the two parts of the upper cavity that are isolated by the fixed baffle and the adjusting block. The wear and tear prediction process is configured as follows: S31: Based on the desired swashplate rotation command U and the actual swashplate angle θ, the system deviation Δθ of the swashplate angle caused by mechanical wear and the transmission clearance δ are estimated in real time using an adaptive estimation algorithm. S32: Add the system deviation Δθ to the desired inclined plane angle command U to generate a command after deviation compensation; S33: When a change in the direction of the desired inclined plate angle command U is detected, a pulse compensation signal U1 calculated based on the transmission gap δ is superimposed on the command after deviation compensation to generate the final compensation command U2. S34: Output the final compensation command U2 to the internal motor to drive the inclined plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by optimizing the mechanical structure, the dead zone and hysteresis caused by mechanical clearance and elastic deformation of the variable mechanism are effectively eliminated, significantly improving the dynamic response speed and static accuracy of flow control. At the same time, the solution improves the stress state of the swashplate and slipper through force balance design, eliminating the phenomenon of uneven wear. This not only greatly extends the service life of the pump, but also ensures high accuracy and high stability of flow output throughout the entire life cycle, thereby achieving a simultaneous leap in the adjustment performance and reliability of the hydraulic system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the adjustment component structure of the present invention; Figure 3 This is a schematic diagram of the compensation unit structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the connection component structure of the present invention; Figure 6 This is a schematic diagram of the driving component structure of the present invention; Figure 7This is a schematic diagram of the control principle of the controller of the present invention.

[0016] In the diagram: 1. Hydraulic pump housing; 11. Housing; 12. Perforation; 13. Internal assembly cavity; 2. Adjustment component; 21. Inclined plate; 22. Connecting shaft; 23. First comb tooth groove; 24. Angle sensor; 25. Compensation unit; 251. Oil pipe; 252. Column housing; 253. Positioning plate; 254. Internal motor; 255. Adjusting rod; 256. Piston plate; 257. Slide groove; 258. Positioning block; 26. Hexagonal prism; 27. Connecting assembly; 271. Column; 272. Upper cavity; 273. Fixing baffle; 274. Second comb tooth groove; 275. Mounting hole; 276. Oil hole; 28. Driving component; 281. Drive shaft; 282. Adjusting block; 29. Frameless torque motor; 3. Transmission components; 4. Plunger; 5. Pump chamber; 6. Rear end cover; 100. Controller. Detailed Implementation

[0017] Please see Figures 1-7 The present invention provides a technical solution: An adaptive flow regulating hydraulic pump and its control method include a hydraulic pump housing 1, a transmission component 3, a plunger 4, a pump chamber 5, and a rear end cover 6. The transmission component 3 is installed on the inner side of one end of the hydraulic pump housing 1, and the pump chamber 5 is installed on the other end of the transmission component 3. The plunger 4 is installed on the inner side of the pump chamber 5. The rear end cover 6 is installed at the tail end of the hydraulic pump housing 1 via bolts and a sealing ring. An adjusting component 2 is installed on one side of the plunger 4. The adjusting component 2 includes an inclined plate 21, with a connecting shaft 22 welded and fixed to both the upper and lower ends of the inclined plate 21. The outer side of the connecting shaft 22 is open. The device has a first comb groove 23. An angle sensor 24 for measuring the tilt angle of the inclined plate 21 is installed at the bottom of the lower connecting shaft 22. A hexagonal prism 26 is inserted into the inner side of the upper end of the upper connecting shaft 22. A connecting assembly 27 is fixedly connected to the upper end of the hexagonal prism 26. A compensation unit 25 is installed inside the connecting assembly 27. A driving component 28 is installed at the upper end of the connecting assembly 27. The other end of the driving component 28 is fixedly connected to the drive shaft of the frameless torque motor 29. The housing of the frameless torque motor 29 is installed on the upper end of the hydraulic pump housing 1 by bolts.

[0018] As a further implementation of this solution, the technical solution also includes a controller 100, which is used to receive the desired angle command of the inclined plate 21 and the predicted compensation angle command of the inclined plate 21. By setting the controller 100 as described above, the flow rate of the hydraulic pump can be adjusted in real time. As a further implementation of this solution, the hydraulic pump housing 1 includes a housing 11, the housing 11 has a vertical through hole 12 and a horizontal internal assembly cavity 13. The housing 11 is rotatably connected to the connecting shaft 22 through the through hole 12. The first comb groove 23 is located inside the through hole 12. With the above arrangement, the transmission component 3, the plunger 4, and the pump body 5 can be stably installed. As a further implementation of this solution, the compensation unit 25 includes two oil pipes 251. One end of the oil pipe 251 is fixedly connected to the cylindrical shell 252. Both ends of the cylindrical shell 252 are fixedly connected to positioning plates 253. An internal motor 254 is fixedly connected to the inner side of one of the positioning plates 253. An adjusting rod 255 is fixedly connected to the top of the main shaft of the internal motor 254. A piston plate 256 is spirally connected to the outer side of the adjusting rod 255. Positioning blocks 258 are fixedly connected to the upper and lower ends of the piston plate 256. The positioning blocks 258 are slidably connected to the groove 257 opened inside the cylindrical shell 252. Through the above settings, the adjustment can be compensated according to the wear degree of the inclined plate 21, thereby improving the accuracy of flow control. As a further implementation of this solution, the positioning plate 253 has a perforation in an annular shape inside. The end of the adjusting rod 255 away from the internal motor 254 is rotatably connected to the positioning plate 253. The positioning plate 253, the adjusting rod 255 and the piston plate 256 are coaxially arranged. Through the above arrangement, the stability of the frameless torque motor 29 in adjusting the inclined plate 21 can be guaranteed. As a further implementation of this solution, the connecting component 27 includes a column 271, with a mounting hole 275 in the middle of the column 271, an upper cavity 272 and an oil hole 276 at the upper end of the column 271, a second comb groove 274 inside the upper cavity 272, and a fixed baffle 273 installed on one side inside the upper cavity 272. Through the above settings, the hydraulic oil inside the compensation unit 25 can be stably sealed. As a further implementation of this solution, two oil holes 276 are provided, and the oil holes 276 are connected through the upper cavity 272. An oil pipe 251 is installed at the opening of the oil holes 276. Through the above arrangement, the hydraulic oil inside the upper cavity 272 can be connected with the inside of the rod 271. As a further implementation of this solution, the cylindrical shell 252 is installed in the middle of the mounting hole 275, and the center points of the cylindrical shell 252, the hexagonal prism 26, the connecting assembly 27 and the connecting shaft 22 are set on the same vertical line. Through the above arrangement, the stability of the overall operation of the device is further improved. As a further implementation of this solution, the driving component 28 includes a driving shaft 281, which is stepped. An adjusting block 282 is fixedly connected to one side of the bottom end of the driving shaft 281. The adjusting block 282 is rotatably connected to the inner wall of the upper cavity 272. The driving shaft 281 is rotatably connected to the fixed baffle 273. Through the above arrangement, the upper end of the upper cavity 272 can be further sealed.

[0019] As a further implementation of this solution, the technical solution includes the following steps: Step 1: The controller 100 receives the pressure signal required by the hydraulic pump and the initial signal of the internal control element, and generates corresponding instructions to control the operation of the internal control element of the hydraulic pump; Step 2: Adjust the angle of the inclined plate 21 according to the required output pressure of the hydraulic pump: The adjustment is achieved by the frameless torque motor 29 driving the drive component 28, the connecting component 27 and the hexagonal prism 26 to rotate, thereby driving the connecting shaft 22 to rotate to the predetermined position; Step 3: Based on the operating time of the hydraulic pump, predict the wear degree of the inclined plate 21, issue a control command to make the compensation unit 25 run and perform compensation; During the compensation process, the internal motor 254 drives the piston plate 256 to adjust the volume of the hydraulic oil stored in the two parts of the upper cavity 272 that are isolated by the fixed baffle 273 and the adjusting block 282. The wear and tear prediction process is configured as follows: S31: Based on the desired swashplate 21 rotation command U and the actual swashplate 21 angle θ, the adaptive estimation algorithm is used to estimate the swashplate angle system deviation Δθ and transmission clearance δ caused by mechanical wear in real time. S32: Add the system deviation Δθ to the desired angle command U of the inclined plate 21 to generate a command after deviation compensation; S33: When the direction of change of the desired angle command U of the inclined plate 21 is detected to change, a pulse compensation signal U1 calculated based on the transmission gap δ is superimposed on the command after deviation compensation to generate the final compensation command U2. S34: Output the final compensation command U2 to the internal motor 254 to drive the swashplate 21.

[0020] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. An adaptive flow regulating hydraulic pump, comprising a hydraulic pump housing (1), a transmission component (3), a plunger (4), a pump body (5), and a rear end cover (6), characterized in that: A transmission component (3) is installed on the inner side of one end of the hydraulic pump housing (1), a pump chamber (5) is installed on one end of the transmission component (3), a plunger (4) is installed on the inner side of the pump chamber (5), a rear end cover (6) is installed at the tail end of the hydraulic pump housing (1) by bolts and a sealing ring, and an adjustment component (2) is installed on one side of the plunger (4). The adjustment component (2) includes an inclined plate (21), and a connecting shaft (22) is welded and fixed to both the upper and lower ends of the inclined plate (21). A first comb groove (23) is provided on the outer side of the connecting shaft (22). An angle sensor (24) for measuring the tilt angle of the inclined plate (21) is installed at the bottom end of the lower connecting shaft (22). A hexagonal prism (26) is inserted into the inner side of the upper end of the upper connecting shaft (22). A connecting component (27) is fixedly connected to the upper end of the hexagonal prism (26). A compensation unit (25) is installed inside the connecting component (27). A driving component (28) is installed on the upper end of the connecting component (27). The other end of the driving component (28) is fixedly connected to the drive shaft of the frameless torque motor (29). The frameless torque motor (29) housing is bolted to the upper end of the hydraulic pump housing (1).

2. The adaptive flow regulating hydraulic pump according to claim 1, characterized in that: It also includes a controller (100) for receiving the desired swashplate (21) angle command and the swashplate (21) predicted compensation angle command.

3. The adaptive flow regulating hydraulic pump according to claim 1, characterized in that: The hydraulic pump housing (1) includes a housing (11), which has a vertically oriented perforation (12) and a horizontally oriented internal assembly cavity (13). The housing (11) is rotatably connected to the connecting shaft (22) through the perforation (12), and the first comb groove (23) is located inside the perforation (12).

4. The adaptive flow regulating hydraulic pump according to claim 1, characterized in that: The compensation unit (25) includes two oil pipes (251). One end of the oil pipe (251) is fixedly connected to the cylindrical shell (252). Both ends of the cylindrical shell (252) are fixedly connected to positioning plates (253). An internal motor (254) is fixedly connected to the inner side of one of the positioning plates (253). An adjusting rod (255) is fixedly connected to the top of the main shaft of the internal motor (254). A piston plate (256) is spirally connected to the outer side of the adjusting rod (255). Positioning blocks (258) are fixedly connected to the upper and lower ends of the piston plate (256). The positioning blocks (258) are slidably connected to the groove (257) opened inside the cylindrical shell (252).

5. The adaptive flow regulating hydraulic pump according to claim 4, characterized in that: The positioning plate (253) has a perforation in an annular shape inside. The end of the adjusting rod (255) away from the internal motor (254) is rotatably connected to the positioning plate (253). The positioning plate (253), the adjusting rod (255) and the piston plate (256) are coaxially arranged.

6. The adaptive flow regulating hydraulic pump according to claim 1, characterized in that: The connecting assembly (27) includes a column (271), a mounting hole (275) is provided in the middle of the column (271), an upper cavity (272) and an oil hole (276) are provided at the upper end of the column (271), a second comb groove (274) is provided inside the upper cavity (272), and a fixed baffle (273) is installed on one side inside the upper cavity (272).

7. The adaptive flow regulating hydraulic pump according to claim 6, characterized in that: Two oil holes (276) are provided, and the oil holes (276) are connected through the upper cavity (272). An oil pipe (251) is installed at the opening of the oil hole (276).

8. The adaptive flow regulating hydraulic pump according to claim 4, characterized in that: The cylindrical shell (252) is installed in the middle of the mounting hole (275), and the center points of the cylindrical shell (252), the hexagonal prism (26), the connecting assembly (27) and the connecting shaft (22) are set on the same vertical line.

9. The adaptive flow regulating hydraulic pump according to claim 1, characterized in that: The driving component (28) includes a driving shaft (281), which is stepped. An adjusting block (282) is fixedly connected to one side of the bottom end of the driving shaft (281). The adjusting block (282) is rotatably connected to the inner wall of the upper cavity (272). The driving shaft (281) is rotatably connected to the fixed baffle (273).

10. A control method for an adaptive flow regulating hydraulic pump according to any one of claims 1-9, characterized in that: Includes the following steps: Step 1: The controller (100) receives the pressure signal required by the hydraulic pump and the initial signal of the internal control element, and generates corresponding instructions to control the operation of the internal control element of the hydraulic pump; Step 2: Adjust the angle of the inclined plate (21) according to the output pressure required by the hydraulic pump: The adjustment is achieved by using a frameless torque motor (29) to drive the drive component (28), the connecting assembly (27), and the hexagonal prism (26) to rotate, thereby driving the connecting shaft (22) to rotate to a predetermined position; Step 3: Based on the running time of the hydraulic pump, predict the wear degree of the inclined plate (21), issue a control command to make the compensation unit (25) run and perform compensation; During the compensation process, the internal motor (254) pushes the piston plate (256) to adjust the volume of hydraulic oil stored in the two parts of the upper cavity (272) that are separated by the fixed baffle (273) and the adjusting block (282). The wear and tear prediction process is configured as follows: S31: Based on the desired swashplate (21) rotation command U and the actual swashplate (21) angle θ, the swashplate angle system deviation Δθ and transmission clearance δ caused by mechanical wear are estimated in real time through an adaptive estimation algorithm; S32: Add the system deviation Δθ to the desired inclined plate (21) angle command U to generate a command after deviation compensation; S33: When the direction of change of the desired inclined plate (21) angle command U is detected to change, a pulse compensation signal U1 calculated based on the transmission gap δ is superimposed on the command after deviation compensation to generate the final compensation command U2. S34: Output the final compensation command U2 to the internal motor (254) to drive the inclined plate (21).

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