A novel proportional control variable hydraulic pump control system

Abstract

This utility model discloses a novel proportional control variable hydraulic pump control system, belonging to the field of hydraulic pump technology. It includes a control unit, a servo motor, and a hydraulic pump connected in sequence. The variable mechanism of the hydraulic pump includes a variable cylinder, a variable arm, and an adjusting screw. The adjusting screw passes through a support ring and is threadedly engaged with the variable cylinder, driving the variable cylinder to slide axially. A support ring restricts the circumferential rotation of the variable cylinder. A limiting sleeve restricting the maximum axial movement of the variable cylinder is threaded onto the adjusting screw. The variable cylinder is hinged to the variable arm via a slider. A photoelectric detector is located at the end of the adjusting screw to detect the rotation angle of the adjusting screw and generate a position feedback signal; the photoelectric detector is connected to the control unit. A pressure gauge and a flow meter are located at the outlet of the hydraulic pump, and the pressure gauge and flow meter are respectively connected to the control unit. This utility model does not require modification of the original drive mechanism; multiple control modes can be achieved simply by adding the variable mechanism.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic pump control technology, and in particular to a novel proportional control variable hydraulic pump control system. Background Technology

[0002] Existing hydraulic pump variable control methods include electro- (electromagnetic) control, hydraulic control, mechanical (manual) control, and electro-hydraulic dual control, with diverse structures and varying control accuracies. The complex mechanisms and inconsistent control precision of existing control methods cause inconvenience in practical applications. 1. Mechanical control mode is generally used in systems with the lowest control precision requirements. The machining precision of its components and the fit error of the mechanism all affect the control precision. Specifically, relying on manual adjustment or cam mechanism, it suffers from problems such as adjustment lag, low precision, and inability to respond to load changes in real time. Machining and assembly errors (such as gear backlash and connecting rod tolerances) will further amplify the control deviation.

[0003] 2. The use of electronic control mode in systems with slightly higher control precision requirements is affected by factors such as the machining precision of components, the hysteresis of the electromagnet coil, and temperature. Specifically, it drives the valve core through a proportional electromagnet, and the residual magnetism of the iron core causes displacement repeatability errors; the heating of the coil causes the electromagnetic force to decay, requiring an additional temperature compensation circuit; there is a dead zone in the low current region, and it is prone to saturation in the high current region.

[0004] 3. In the electro-hydraulic dual control mode, the opening of the electromagnet and the hydraulic valve core greatly improves the linearity of the control power curve. However, the external control oil supply and electromagnetic control increase the complexity of the system, requiring an independent external control oil supply and a complex pilot valve group, which leads to system pipeline redundancy and increased failure rate.

[0005] Therefore, there is an urgent need for a new type of control system that is simple in structure, easy to operate, and has high control precision. Utility Model Content

[0006] The purpose of this invention is to overcome the problems existing in the prior art and to provide a novel proportional control variable hydraulic pump control system.

[0007] The objective of this utility model is achieved through the following technical solution: A novel proportional control variable hydraulic pump control system is provided, comprising a control unit, a servo motor, and a hydraulic pump connected in sequence. The hydraulic pump includes a pump body and a variable mechanism disposed in the pump body. The variable mechanism includes a variable cylinder, a variable arm, and an adjusting screw. The servo motor is mounted on the side of the pump body, and the output shaft of the servo motor is connected to the adjusting screw via a coupling; the variable cylinder is fitted with a support ring that restricts its circumferential rotation; the adjusting screw passes through the support ring and is threaded into the variable cylinder, driving the variable cylinder to slide axially; a limiting sleeve that restricts the maximum axial movement of the variable cylinder is threaded onto the adjusting screw; the variable cylinder is hinged to the variable arm via a slider. The end of the adjusting lead screw is provided with a photoelectric detector for detecting the rotation angle of the adjusting lead screw and generating a position feedback signal, and the photoelectric detector is connected to the control unit; The hydraulic pump outlet is equipped with a pressure gauge and a flow meter, which are respectively connected to the control unit.

[0008] In some embodiments, the outer end cover of the hydraulic pump is provided with an emergency release button, which has a built-in manual push rod that can push the adjusting screw to axially reset.

[0009] In some embodiments, the servo motor is fixedly mounted on the outer end cover of the hydraulic pump via a flange, and the axis of the servo motor coincides with the center line of the adjusting screw.

[0010] In some embodiments, the slider and the variable arm are connected by a ball joint.

[0011] It should be further noted that the technical features corresponding to the above system embodiments can be combined or substituted with each other to form new technical solutions without conflict.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. The variable displacement mechanism of this hydraulic pump drives a variable displacement cylinder to slide left and right on a support ring by rotating an adjusting screw. The variable displacement cylinder drives a slider to swing the variable displacement arm. A limit sleeve restricts the maximum stroke of the variable displacement cylinder, and an emergency release hole allows for manual reset in case of motor failure. This variable displacement control mechanism is simple and easy to manufacture. It can replace the original mounting holes without altering the original hydraulic pump structure and dimensions, without increasing the bidirectional clearance of the mechanism. By utilizing existing mature servo electronic control systems to form a dual closed-loop control valve group, the linear accuracy of the control valve can be improved to meet the needs of many applications requiring precision control. This valve group does not increase or change the existing pump structure and installation space, and can perfectly replace and improve old pump systems to meet the precision control requirements.

[0013] 2. It solves the problem of traditional complex control methods and lays a solid foundation for the coordinated operation of intelligent products by unifying the usage methods. The hydraulic pump only needs to be connected to the electrical circuit of the control system to realize the original electric (electromagnetic) control, hydraulic control, mechanical control, and electro-hydraulic dual control modes. This saves equipment installation and commissioning time, reduces losses caused by errors in multiple links, provides a more convenient operation mode, and can even be connected with AI and other intelligent systems to achieve rapid response. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the electro-hydraulic control principle of this utility model; Figure 2 This is a schematic diagram of the hydraulic pump structure of this utility model; Figure 3 This is a schematic diagram of the control principle of the variable mechanism of this utility model.

[0015] In the diagram: 1-Hydraulic pump; 2-Servo motor; 3-Control unit; 4-Pressure gauge; 5-Flow meter; 6-Photoelectric detector; 7-Emergency release button; 8-Variable lever; 11-Variable cylinder; 12-Variable arm; 13-Adjusting screw; 14-Support ring; 15-Limit sleeve; 16-Slider. Detailed Implementation

[0016] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] In the description of this utility model, it should be noted that the directions or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", "outer" etc. are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] Reference Figures 1-3 A novel proportional control variable hydraulic pump control system includes a control unit 3, a servo motor 2, and a hydraulic pump 1 connected in sequence. The hydraulic pump 1 includes a pump body and a variable mechanism disposed in the pump body. The variable mechanism includes a variable cylinder 11, a variable arm 12, and an adjusting screw 13. The servo motor 2 is installed on the side of the pump body, and the output shaft of the servo motor 2 is connected to the adjusting screw 13 through a coupling; the variable cylinder 11 is fitted with a support ring 14 to restrict its circumferential rotation; the adjusting screw 13 passes through the support ring 14 and is threadedly engaged with the variable cylinder 11, driving the variable cylinder 11 to slide axially; a limiting sleeve 15 is threadedly connected to the adjusting screw 13 to limit the maximum axial movement of the variable cylinder 11; the variable cylinder 11 is hinged to the variable arm 12 through a slider 16; The end of the adjusting screw 13 is provided with a photoelectric detector 6 for detecting the rotation angle of the adjusting screw 13 and generating a position feedback signal. The photoelectric detector 6 is connected to the control unit 3. The outlet of the hydraulic pump is equipped with a pressure gauge 4 and a flow meter 5, which are respectively connected to the control unit 3.

[0021] Specifically, such as Figure 1 As shown, servo motor 2 drives the variable displacement mechanism of hydraulic pump 1 through a mechanical transmission structure. The servo motor 2 feeds back a position signal (via photoelectric detector 6) to control unit 3. The hydraulic pump outputs detection signals (pressure gauge 4 and flow meter 5) and feeds them back to control unit 3. Control unit 3, based on the position signal from servo motor 2 and the detection signal from the pump output port, compares the set value and gradually adjusts the system to the required operating parameters. This structure uses a DC servo motor to drive the variable displacement mechanism. Through photoelectric detection feedback signals, the pump's output flow rate and pressure are fed back to the motor control module to adjust the output motor drive current, thereby adapting to the required pump flow rate. This achieves electro-hydraulic dual closed-loop control, providing high control accuracy, convenient installation, and automatic adjustment.

[0022] Furthermore, the outer end cover of the hydraulic pump 1 is provided with an emergency release button 7, and the emergency release button 7 has a built-in manual push rod that can push the adjusting screw 13 to axially reset.

[0023] Specifically, the working principle of the variable mechanism is as follows: The servo motor 2 drives the variable cylinder 11 to slide left and right on the support ring 14 by rotating the adjusting screw 13. The variable cylinder 11 drives the slider 16 to push the variable arm 12 to swing and work. The limit sleeve 15 limits the maximum stroke of the variable cylinder 11. The emergency release button 7 is manually reset in case of motor failure.

[0024] Furthermore, such as Figure 3 As shown, the forward and reverse direction and flow rate regulation of the closed-loop pump are achieved through a variable mechanism designed and manufactured according to the power curve. The servo motor 2, adjusting screw 13, photoelectric detector 6, and emergency release button 7 are connected in series via a through shaft. During normal operation, the servo motor 2 drives the adjusting screw 13, and the photoelectric detector 6 provides feedback. If the motor fails, manual reset is achieved via the emergency release button 7 at the tail end. A manual push rod can push the adjusting screw 13 to axial reset. The variable lever 8 and variable cylinder 11 are driven by the original design mechanism and require no modification; simply connecting them to the variable mechanism enables the control function.

[0025] Furthermore, the servo motor 2 is fixedly mounted on the outer end cover of the hydraulic pump 1 via a flange, and the axis of the servo motor 2 coincides with the center line of the adjusting screw 13 to ensure no radial off-center load.

[0026] Furthermore, the slider 16 and the variable arm 12 are connected by a ball joint, the end of the slider 16 is machined into a ball head seat, and the drive end of the variable arm 12 is provided with a ball socket joint. The two are nested to form a universal joint structure to compensate for installation deviations.

[0027] The improved control valve system has a simple structure and is easy to manufacture. It does not increase the bidirectional clearance of the mechanism. It can be matched with an existing mature servo electronic control system to form a double closed-loop control valve group. The improved linear accuracy of the control valve can meet the needs of many occasions that require precision control. This valve group will not increase or change the existing pump structure and installation space, and can perfectly replace and improve the precision control requirements of old pump group systems.

[0028] The above detailed embodiments are a detailed description of the present utility model. It should not be considered that the specific embodiments of the present utility model are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present utility model, and all of these should be considered to fall within the protection scope of the present utility model.

Claims

1. A novel proportional control variable hydraulic pump control system, characterized by, The system includes a control unit, a servo motor, and a hydraulic pump connected in sequence. The hydraulic pump includes a pump body and a variable mechanism disposed in the pump body. The variable mechanism includes a variable cylinder, a variable arm, and an adjusting screw. The servo motor is mounted on the side of the pump body, and the output shaft of the servo motor is connected to the adjusting screw via a coupling; the variable cylinder is fitted with a support ring that restricts its circumferential rotation; the adjusting screw passes through the support ring and is threaded into the variable cylinder, driving the variable cylinder to slide axially; a limiting sleeve that restricts the maximum axial movement of the variable cylinder is threaded onto the adjusting screw; the variable cylinder is hinged to the variable arm via a slider. The end of the adjusting lead screw is provided with a photoelectric detector for detecting the rotation angle of the adjusting lead screw and generating a position feedback signal, and the photoelectric detector is connected to the control unit; The hydraulic pump outlet is equipped with a pressure gauge and a flow meter, which are respectively connected to the control unit.

2. The novel proportional control variable hydraulic pump control system according to claim 1, characterized in that, The hydraulic pump is equipped with an emergency release button on its outer end cover. The emergency release button has a built-in manual push rod that can push the adjusting screw to return to its axial position.

3. A novel proportional control variable hydraulic pump control system according to claim 1, characterized in that, The servo motor is fixedly mounted on the outer end cover of the hydraulic pump via a flange, and the axis of the servo motor coincides with the center line of the adjusting screw.

4. A novel proportional control variable hydraulic pump control system according to claim 1, characterized in that, The slider and the variable arm are connected by a ball joint.

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