A variable displacement control device and method for hydraulic pumps, and an energy consumption optimization control method.

Abstract

This invention relates to a variable displacement control device and method for a hydraulic pump, comprising: a control device body, which is a closed shell structure with an inner cavity, the front end of which is connected to the pump body flange of the hydraulic pump via a connecting flange; a piston pipe disposed within the control device body, wherein a pressure-sensitive piston is disposed inside; a pressure oil pipe, one end of which is connected to the oil outlet on the housing of the hydraulic pump, and the other end of which is connected to the oil inlet of the piston pipe; a lever and a push rod, wherein one end of the lever is hinged to the pressure-sensitive piston, a rotating shaft is disposed in the middle of the lever, the two ends of the rotating shaft are connected to the two side walls of the control device body to provide fulcrum for the lever, the other end of the lever is movably connected to one end of the push rod, and the other end of the push rod is hinged to a swashplate. When the pressure-sensitive piston reciprocates, the tail end of the lever moves up and down to drive the push rod to push the swashplate, thereby controlling the angle of the swashplate.

Description

Technical Field

[0001] This invention relates to the field of hydraulic pump variable displacement control technology, specifically to a device and method for variable displacement control and energy consumption optimization of hydraulic pumps. Background Technology

[0002] In the excavators, loaders, cranes, and injection molding machines and presses commonly seen in our lives, there is a "power heart"—the hydraulic system. As the "power source" of the hydraulic system, the hydraulic pump is responsible for converting the mechanical energy of the engine into hydraulic energy, driving the equipment to complete actions such as digging, lifting, and pressing.

[0003] For example, an excavator needs great force (high pressure) to dig hard soil, but can move slowly (low flow); while moving to a different site does not require much force, but requires rapid movement (high flow). If the output flow and pressure of the hydraulic pump are fixed (i.e., a fixed displacement pump), excess flow will be wasted when digging hard soil and will also generate heat; while during rapid movement, insufficient flow may cause sluggish movement.

[0004] To address this problem, variable displacement pumps were invented, which can adjust the output flow and pressure according to equipment requirements. However, the adjustment devices of existing variable displacement pumps either rely on electronic components (such as solenoid valves and sensors), which are prone to failure in environments with high dust, vibration, and electromagnetic interference, such as mines and construction sites; or they cannot accurately match load changes, still resulting in problems such as energy waste and adjustment lag.

[0005] Therefore, there is an urgent need for a purely mechanical variable regulation and energy consumption optimization device and method that is structurally reliable, does not rely on electronic control, and can accurately match the load, in order to solve the above problems. Summary of the Invention

[0006] To address the aforementioned problems, the purpose of this invention is to provide a variable adjustment and energy consumption optimization control device and method for hydraulic pumps that does not rely on electrical control, can accurately match the load, and has a reliable structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a variable displacement and energy consumption optimization control device for a hydraulic pump. The hydraulic pump includes a housing, a rotating shaft, a swashplate, piston rods, and a pump body flange. The pump body flange is connected to the tail end of the housing. The rotating shaft extends into the housing, and its tail end is connected to the pump body flange. The swashplate is sleeved on the rotating shaft and connected to the rotating shaft via a first ball joint bearing. A plurality of piston rods are disposed on the swashplate, and the piston rods are connected to the swashplate via a second ball joint bearing. The housing is provided with an oil outlet. The control device includes: The control device body is a closed shell structure with an inner cavity, and its front end is connected to the pump body flange of the hydraulic pump through a connecting flange. A piston channel is located within the control device body, and a pressure-sensitive piston is installed inside it. A pressure oil pipeline, one end of which is connected to the oil outlet on the housing of the hydraulic pump, and the other end of which is connected to the oil inlet of the piston pipeline; The lever and push rod are configured such that one end of the lever is hinged to the pressure-sensitive piston, a pivot is provided in the middle of the lever, and both ends of the pivot are connected to the two side walls of the control device body to provide fulcrum for the lever. The other end of the lever is movably connected to one end of the push rod, and the other end of the push rod is hinged to the swashplate. When the pressure-sensitive piston reciprocates, the tail end of the lever moves up and down to drive the push rod to push the swashplate, thereby controlling the angle of the swashplate.

[0008] Preferably, in the variable adjustment and energy consumption optimization control device for the hydraulic pump, a filter screen is provided at the connection between the pressure oil pipeline and the piston pipeline, and the filter screen is used to filter impurities in the hydraulic oil.

[0009] Preferably, in the variable adjustment and energy consumption optimization control device for the hydraulic pump, the push rod and the swashplate are hinged together by a first ball joint.

[0010] Preferably, in the aforementioned variable adjustment and energy consumption optimization control device for hydraulic pumps, the push rod is telescopic.

[0011] The variable adjustment and energy consumption optimization control device for the hydraulic pump, preferably, further includes an adjustment component, which is hinged to the lever for further control of the swashplate angle.

[0012] The variable adjustment and energy consumption optimization control device for a hydraulic pump, preferably, includes the following adjustment components: a connecting rod, a second ball head, a limiting plate, a spring, an adjusting block, and an adjusting bolt; the first end of the connecting rod is connected to the limiting plate, the limiting plate is provided with a second ball head, the second ball head is hinged to the lever, the second end of the connecting rod passes through the side wall of the control device body and is connected to the adjusting block, the control device body is provided with a stepped hole; the limiting plate is sleeved on the connecting rod and located below the second ball head; the spring is sleeved on the connecting rod, its upper part is connected to the limiting plate, and its lower part abuts against the stepped hole; the adjusting block adjusts the distance between itself and the side wall of the control device body through the adjusting bolt to adjust the preload of the spring.

[0013] Preferably, in the variable adjustment and energy consumption optimization control device for the hydraulic pump, a sealing ring is provided between the connecting rod and the side wall of the control device body, and the sealing ring is used to seal the control device body.

[0014] Preferably, a buffer pad is provided on the side wall of the control device body opposite to the adjusting block in the variable adjustment and energy consumption optimization control device for hydraulic pump.

[0015] The present invention also provides a method for variable regulation and energy consumption optimization control of a hydraulic pump, comprising the following steps: During the operation of the hydraulic pump, a portion of the hydraulic oil flows out from the oil outlet on the housing and enters the piston pipe. The hydraulic oil pushes the pressure-sensitive piston in the piston pipe to move, thereby causing the tail end of the lever to move downward, so that the push rod pushes the swashplate to control the swashplate angle.

[0016] Preferably, the control method further includes the following steps: The adjusting block is adjusted by adjusting the adjusting bolt so that the spring is initially in a pre-compressed state with preload. The spring acts as a reaction force on the lever to further balance the push rod's thrust and further adjust the angle of the swashplate.

[0017] The present invention has the following advantages due to the adoption of the above technical solutions: This invention eliminates electronic control components and achieves real-time sensing of load pressure and precise adjustment of displacement solely through mechanical structures, thereby improving reliability under extreme operating conditions. This invention establishes a dynamic "pressure-flow" matching mechanism, which realizes multiple constant power curves through an adjustable spring assembly to adapt to different equipment operating conditions, ensuring that the pump output power is always consistent with the load demand and eliminating overflow energy consumption. This invention integrates "pressure sensing, feedback adjustment, and displacement control" functional modules, reducing the number of parts and simplifying assembly and maintenance. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings: Figure 1 This is a schematic diagram of the external structure of the variable adjustment and energy consumption optimization control device for hydraulic pumps of the present invention, which is connected to the hydraulic pump. Figure 2 This is a schematic diagram of the internal structure of the variable regulation and energy consumption optimization control device for hydraulic pumps of the present invention; Figure 3This is a schematic diagram of the connection between the push rod and the swashplate of the present invention; Figure 4 This is a schematic diagram of the structure of the adjustment component of the present invention.

[0019] The labels for the attached figures are as follows: 1-Housing; 101-Oil outlet; 2-Rotating shaft; 3-Swashplate; 4-Piston rod; 5-Pump body flange; 6-First ball joint bearing; 7-Second ball joint bearing; 8-Control device body; 9-Connecting flange; 10-Piston pipe; 11-Pressure-sensitive piston; 12-Pressure oil pipe; 13-Lever; 14-Push rod; 15-Rotating shaft; 16-First ball head; 17-Connecting rod; 18-Second ball head; 19-Limiting plate; 20-Spring; 21-Adjusting block; 22-Adjusting bolt. Detailed Implementation

[0020] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0021] This invention provides a variable displacement control and energy consumption optimization control device and method for a hydraulic pump. Hydraulic oil extracted by the pump is introduced into the control device through a pressure oil pipeline, driving a pressure-sensitive piston to move. This, in turn, causes the tail end of a lever to press down, which in turn drives a push rod to push a swashplate, thereby controlling the swashplate angle. This invention does not rely on electronic control, can accurately match the load, and has a reliable structure.

[0022] like Figures 1 to 3 As shown, this invention provides a variable displacement and energy consumption optimization control device for a hydraulic pump. The hydraulic pump includes a housing 1, a rotating shaft 2, and a swashplate 3 (see...). Figure 2 ), piston rod 4 (see Figure 2The control device includes: a control device body 8, which is a closed housing structure with an inner cavity, whose front end is connected to the pump body flange 5 of the hydraulic pump through a connecting flange 9; a piston pipe 10, which is located inside the control device body 8 and has a pressure-sensitive piston 11 inside; a pressure oil pipe 12, one end of which is connected to the oil outlet 101 on the housing 1 of the hydraulic pump, and the other end of which is connected to the oil inlet of the piston pipe 10; a lever 13 and a push rod 14 (see...). Figure 3 One end of lever 13 is hinged to pressure-sensitive piston 11. A rotating shaft 15 is provided in the middle of lever 13. Both ends of rotating shaft 15 are connected to the two side walls of control device body 8 to provide fulcrum for lever 13. The other end of lever 13 is movably connected to one end of push rod 14. The other end of push rod 14 is hinged to swashplate 3. When pressure-sensitive piston 11 reciprocates, the tail end of lever 13 moves up and down to drive push rod 14 to push swashplate 3, thereby controlling the angle of swashplate 3.

[0023] In the above embodiments, preferably, a filter screen (not shown in the figure) is provided at the connection between the pressure oil pipe 12 and the piston pipe 10. The filter screen is used to filter impurities in the hydraulic oil.

[0024] In the above embodiment, preferably, the push rod 14 is hinged to the swashplate 3 via a first ball joint 16. Therefore, when the swashplate moves at a set angle, the push rod 14 will not interfere with the swashplate 3.

[0025] In the above embodiments, preferably, the push rod is telescopic.

[0026] In the above embodiments, preferably, as follows: Figure 4 As shown, the present invention also includes an adjustment component, which is hinged to the lever 13 for further control of the angle of the swashplate 3.

[0027] In the above embodiment, preferably, the adjustment assembly includes: a connecting rod 17, a second ball head 18, a limiting plate 19, a spring 20, an adjusting block 21, and an adjusting bolt 22; the first end of the connecting rod 17 is connected to the limiting plate 19, the limiting plate 19 is provided with the second ball head 18, the second ball head 18 is hinged to the lever 13, the second end of the connecting rod 17 passes through the side wall of the control device body 8 and is connected to the adjusting block 21, the control device body 8 is provided with a stepped hole; the limiting plate 19 is sleeved on the connecting rod 17 and is located below the second ball head 18; the spring 20 is sleeved on the connecting rod 17, the upper part is connected to the limiting plate 19, and the lower part abuts against the stepped hole; the adjusting block 21 adjusts the distance between itself and the side wall of the control device body 8 by adjusting the adjusting bolt 22, so as to adjust the preload of the spring 20.

[0028] In the above embodiments, preferably, a sealing ring is provided between the connecting rod 17 and the side wall of the control device body 8, and the sealing ring is used to seal the control device body 8.

[0029] In the above embodiment, preferably, a buffer pad is provided on the side wall of the control device body 8 opposite to the adjusting block 21. The buffer pad serves to cushion the connection between the adjusting bolt and the side wall of the control device body 8.

[0030] The present invention also provides a method for variable regulation and energy consumption optimization control of a hydraulic pump, comprising the following steps: During the operation of the hydraulic pump, a portion of the hydraulic oil flows out from the oil outlet 101 on the housing 1 and enters the piston pipe 10. The hydraulic oil pushes the pressure-sensitive piston 11 in the piston pipe 10 to move, thereby causing the tail end of the lever 13 to move downward, so that the push rod 14 pushes the swashplate 3 to control the angle of the swashplate 3.

[0031] In the above embodiments, preferably, the present invention further includes the following steps: Adjusting the adjusting block 21 by adjusting the adjusting bolt 22 so that the spring 20 is initially in a pre-compressed state with pre-tension. The spring 20 exerts a reaction force on the lever 13 to further balance the thrust of the push rod 14 and further adjust the angle of the swashplate 3.

[0032] This invention utilizes the power of the piston pump itself to adjust the angle of the swashplate 3 as needed, resulting in a simple structure and convenient operation.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A variable displacement and energy consumption optimization control device for a hydraulic pump, the hydraulic pump comprising a housing, a rotating shaft, a swashplate, piston rods, and a pump body flange, the pump body flange being connected to the tail end of the housing, the rotating shaft extending into the housing and its tail end being connected to the pump body flange, the swashplate being sleeved on the rotating shaft and connected to the rotating shaft via a first ball joint bearing, and a plurality of piston rods being disposed on the swashplate, the piston rods being connected to the swashplate via a second ball joint bearing; characterized in that, The housing is provided with an oil outlet, and the control device includes: The control device body is a closed shell structure with an inner cavity, and its front end is connected to the pump body flange of the hydraulic pump through a connecting flange. A piston channel is located within the control device body, and a pressure-sensitive piston is installed inside it. A pressure oil pipeline, one end of which is connected to the oil outlet on the housing of the hydraulic pump, and the other end of which is connected to the oil inlet of the piston pipeline; The lever and push rod are configured such that one end of the lever is hinged to the pressure-sensitive piston, a pivot is provided in the middle of the lever, and both ends of the pivot are connected to the two side walls of the control device body to provide fulcrum for the lever. The other end of the lever is movably connected to one end of the push rod, and the other end of the push rod is hinged to the swashplate. When the pressure-sensitive piston reciprocates, the tail end of the lever moves up and down to drive the push rod to push the swashplate, thereby controlling the angle of the swashplate.

2. The variable regulation and energy consumption optimization control device for a hydraulic pump according to claim 1, characterized in that, A filter screen is installed at the connection between the pressure oil pipeline and the piston pipeline, and the filter screen is used to filter impurities in the hydraulic oil.

3. The variable regulation and energy consumption optimization control device for a hydraulic pump according to claim 1, characterized in that, The push rod and the swashplate are hinged together by a first ball joint.

4. The variable regulation and energy consumption optimization control device for a hydraulic pump according to claim 1, characterized in that, The push rod is telescopic.

5. The variable regulation and energy consumption optimization control device for a hydraulic pump according to claim 1, characterized in that, It also includes an adjustment component, which is hinged to the lever, for further control of the swashplate angle.

6. The variable regulation and energy consumption optimization control device for a hydraulic pump according to claim 5, characterized in that, The adjustment assembly includes: a connecting rod, a second ball head, a limiting plate, a spring, an adjusting block, and an adjusting bolt; The first end of the connecting rod is connected to the limiting plate, the limiting plate is provided with a second ball head, the second ball head is hinged to the lever, the second end of the connecting rod passes through the side wall of the control device body and is connected to the adjusting block, and the control device body is provided with a stepped hole; The limiting disc is sleeved on the connecting rod and is located below the second ball head; The spring is sleeved on the connecting rod, with its upper part connected to the limiting plate and its lower part abutting against the stepped hole; The adjusting block is adjusted to maintain its distance from the side wall of the control device body via adjusting bolts, thereby adjusting the preload of the spring.

7. The variable regulation and energy consumption optimization control device for a hydraulic pump according to claim 6, characterized in that, A sealing ring is provided between the connecting rod and the side wall of the control device body, and the sealing ring is used to seal the control device body.

8. The variable regulation and energy consumption optimization control device for a hydraulic pump according to claim 6, characterized in that, A buffer pad is provided on the side wall of the control device body opposite to the adjustment block.

9. A control method for a variable regulation and energy consumption optimization control device for a hydraulic pump based on any one of claims 1 to 8, characterized in that, Includes the following steps: During the operation of the hydraulic pump, a portion of the hydraulic oil flows out from the oil outlet on the housing and enters the piston pipe. The hydraulic oil pushes the pressure-sensitive piston in the piston pipe to move, thereby causing the tail end of the lever to move downward, so that the push rod pushes the swashplate to control the swashplate angle.

10. The control method according to claim 8, characterized in that, It also includes the following steps: The adjusting block is adjusted by adjusting the adjusting bolt so that the spring is initially in a pre-compressed state with preload. The spring acts as a reaction force on the lever to further balance the push rod's thrust and further adjust the angle of the swashplate.

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