Mechanical closed loop cylinder displacement controller

Abstract

This invention relates to a mechanical closed-loop hydraulic cylinder displacement controller, comprising a signal input module, a distribution module, and a position mechanical feedback module. The distribution module is connected to the high-pressure oil port and the return oil port of the oil source. The distribution module receives torque control output from the signal input module to drive the distribution module, causing the hydraulic cylinder to move linearly under its control. The position mechanical feedback module detects the linear displacement of the hydraulic cylinder and converts it into driving force according to a set gain. This driving force is fed back to the distribution module, forming a mechanical closed-loop control of the cylinder's movement by the distribution module. Based on the fundamental need for controlling hydraulic cylinder displacement, this invention represents a substantial product restructuring and structural innovation of traditional hydraulic cylinder displacement control. It not only meets the basic control functions and accuracy requirements of traditional structures but also satisfies requirements in terms of product reliability, economy, energy saving, and ease of control and use, thereby promoting the wider application of high-precision hydraulic cylinder displacement control.

Description

Technical Field

[0001] This invention relates to valve control technology, and more particularly to a mechanical closed-loop hydraulic cylinder displacement controller. Background Technology

[0002] Currently, traditional hydraulic cylinder displacement control, both domestically and internationally, uses proportional or servo pumps or valves to control fluid flow and thus change cylinder speed. Displacement sensors identify cylinder displacement and transmit the signal to a control console. The displacement signal then controls the pump or valve's flow rate and on / off state as required, achieving closed-loop control of the cylinder displacement. Proportional or servo control methods require stable hydraulic system pressure, typically necessitating pressure compensation components to compensate for the load's influence on the proportional / servo pumps and valves. These high-precision hydraulic components, such as proportional / servo pumps and valves, have poor contamination resistance, require high oil cleanliness, experience significant valve pressure loss and high power consumption, and suffer from poor electrical interference immunity due to analog control. For most ordinary hydraulic systems, achieving high-precision cylinder displacement control urgently requires theoretical breakthroughs and methodological innovation.

[0003] like Figure 1 The diagram shows a typical product schematic of a hydraulic cylinder displacement control system in the prior art. Figure 1 As can be seen, the displacement sensor 3 mainly identifies the displacement of the piston rod of the hydraulic cylinder 1, feeds back an analog signal, controls the proportional valve or servo valve 2, changes the position of the valve core, and further controls the flow rate into the hydraulic cylinder to achieve the change of the displacement of the piston rod of the hydraulic cylinder.

[0004] However, the above solutions involve high precision machining and fitting of proportional or servo valve cores, high requirements for the cleanliness of the hydraulic system, large valve port pressure drop, and high energy consumption, resulting in high construction, use, and maintenance costs for the hydraulic system. In contrast, hydraulic systems across various industries today face a series of new requirements, including greater reliability, economy, efficiency, energy saving, and ease of control. Figure 1 These traditional product solutions are facing new challenges and innovations. Summary of the Invention

[0005] To address the problem of high-precision displacement control of hydraulic cylinders, a mechanical closed-loop hydraulic cylinder displacement controller is proposed. It features low energy consumption, low requirements for oil cleanliness and viscosity, avoidance of load influence, strong electrical anti-interference capability, high stability, high positioning accuracy, and simple control.

[0006] The technical solution of the present invention is as follows: a mechanical closed-loop hydraulic cylinder displacement controller, comprising a signal input module, a distribution module, and a position mechanical feedback module. The distribution module is connected to the high-pressure oil port of the oil source and the return oil port. The signal input module outputs control to drive the distribution module. The hydraulic cylinder moves linearly under the control of the distribution module. The position mechanical feedback module detects the linear displacement of the hydraulic cylinder and converts the linear displacement of the hydraulic cylinder into driving force according to a set gain. The driving force is fed back to the distribution module, forming a mechanical closed-loop control of the hydraulic cylinder movement by the distribution module.

[0007] Preferably, the flow distribution module includes a valve body, a valve core, and a valve sleeve. The valve body connects the oil source and the oil cylinder. The valve core and valve sleeve built into the valve body constitute a direct-drive control valve for circumferential oil distribution. The valve core is driven by a signal input module, and the valve sleeve is driven by a position mechanical feedback module.

[0008] Preferably, the rotation of the valve core controls the connection and disconnection of the high-pressure oil source with the oil cylinder and the opening degree, so that the hydraulic oil drives the oil cylinder to move linearly after passing through the valve port; the position mechanical feedback module converts the linear movement of the oil cylinder into the rotation of the valve sleeve according to a predetermined lead, and the valve sleeve adaptively follows the rotation of the valve core.

[0009] Preferably, the signal input module includes a servo motor or stepper motor, a motor driver, and a reducer. The motor driver controls the servo motor or stepper motor to rotate according to the output pulse speed and pulse number. The rotation of the servo motor or stepper motor drives the reducer. The reducer is configured to overcome the torque of the hydraulic force of the distribution module. The output of the reducer drives the distribution module.

[0010] Preferably, the position mechanical feedback module includes a hydraulic cylinder connecting rod, a high-precision equally spaced position rod, a sleeve, and a motion conversion component. One end of the hydraulic cylinder connecting rod is connected to the piston end of the moving component of the hydraulic cylinder or the equivalent hydraulic cylinder moving position, and the other end is connected to the sleeve. The high-precision equally spaced position rod adopts a lead screw or a synchronous belt device. The sleeve is sleeved on one end of the hydraulic cylinder connecting rod and moves with the hydraulic cylinder connecting rod. The sleeve drives the high-precision equally spaced position rod to rotate. The rotation of the high-precision equally spaced position rod drives the motion conversion component to rotate, and the motion conversion component then drives the valve sleeve of the distribution module to rotate.

[0011] Preferably, the sleeve is a lead screw nut or a synchronous belt slide corresponding to a high-precision equally divided position rod.

[0012] The beneficial effects of this invention are as follows: This mechanical closed-loop hydraulic cylinder displacement controller, starting from the fundamental need to control cylinder displacement, has undergone substantial product restructuring and structural innovation in traditional hydraulic cylinder displacement control. This innovative high-precision mechanical closed-loop hydraulic cylinder displacement controller not only meets the basic control functions and precision requirements of traditional structures, but also satisfies requirements in terms of product reliability, economy, energy saving, ease of control and use, thereby bringing a positive and significant impact on promoting the wider application of high-precision hydraulic cylinder displacement control. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a typical product for hydraulic cylinder displacement control in the prior art;

[0014] Figure 2 This is a schematic diagram of the mechanical closed-loop hydraulic cylinder displacement controller of the present invention;

[0015] Figure 3 This is a diagram showing the composition of the signal input module of the present invention;

[0016] Figure 4 This is a diagram showing the composition of the current distribution module of the present invention;

[0017] Figure 5 This is a diagram showing the composition of the position mechanical feedback module of the present invention. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0019] like Figure 2 The schematic diagram of the mechanical closed-loop cylinder displacement controller shown is included. The mechanical closed-loop cylinder displacement controller comprises a signal input module 10, a flow distribution module 11, and a position mechanical feedback module 12. Used in conjunction with a hydraulic oil source and a cylinder, the mechanical closed-loop cylinder displacement controller enables high-precision mechanical closed-loop control of the cylinder position. The flow distribution module 11 connects to the high-pressure port and return port of the oil source. The flow distribution module 11 receives the torque output from the signal input module 10 to start and control the valve core 111 within it, thereby controlling the movement of the cylinder 1. The linear displacement of the cylinder 1 is transmitted to the position mechanical feedback module 12, which precisely converts the linear displacement into rotational motion according to a set gain, driving the valve sleeve 112 of the flow distribution module 11 to move, ultimately achieving control of the cylinder 1's position by the flow distribution module 11.

[0020] like Figure 3The diagram shows the composition of the signal input module 10. The signal input module 10 includes a servo motor or stepper motor 101, a motor driver 102, and a reducer 103. The motor driver 102 controls the servo motor or stepper motor 101 to rotate at a certain pulse speed and a certain number of pulses. The reducer 103 is used to increase the motor torque to overcome the hydraulic force of the distribution module 11, and is configured according to the hydraulic force requirements of the valve core 111 and valve sleeve 112 of the distribution module 11. The drive signal for the motor driver 102 in the signal input module 10 is supplied externally.

[0021] like Figure 4 The diagram shows the composition of the flow distribution module 11, which includes a valve body 110, a valve core 111, and a valve sleeve 112. The valve body 110 connects the oil source to the cylinder 1. The built-in valve core 111 and valve sleeve 112 control the flow rate of the working medium. The valve core 111 and valve sleeve 112 constitute a direct-drive control valve for circumferential oil distribution. The valve core 111 is driven by the signal input module 10, and the valve sleeve 112 is driven by the position mechanical feedback module 12. The valve sleeve 112 rotates with the valve core 111. The rotation of the valve core 111 controls the connection and disconnection of the high-pressure oil source with the cylinder 1, as well as the opening degree. This allows hydraulic oil to drive the cylinder 1 to move linearly after passing through the valve port. The position mechanical feedback module 12 converts the linear movement of the cylinder 1 into the rotation of the valve sleeve 112 according to a predetermined lead, forming a mechanical closed loop. The valve sleeve 112 adaptively follows the rotation of the valve core 111, providing feedback to regulate the connection degree between the high-pressure oil source and the cylinder 1.

[0022] like Figure 5 The diagram shows the composition of the position mechanical feedback module 12, which includes a hydraulic cylinder connecting rod 120, a high-precision equally divided position rod 121, a sleeve 122, and a motion conversion component 123. One end of the hydraulic cylinder connecting rod 120 is connected to the piston end of the moving component of the hydraulic cylinder 1 or the equivalent hydraulic cylinder movement position, and the other end is connected to the sleeve 122. Both ends of the hydraulic cylinder connecting rod 120 can be hinged to obtain a certain swing amount (for easy connection). The high-precision equally divided position rod 121 adopts a lead screw or synchronous belt device, etc. The sleeve 122 is sleeved on one end of the hydraulic cylinder connecting rod 120 and moves with the hydraulic cylinder connecting rod 120. The sleeve 122 is a lead screw nut or synchronous belt slide corresponding to the high-precision equally divided position rod 121, driving the high-precision equally divided position rod to rotate. The rotation of the high-precision equally divided position rod 121 drives the motion conversion component 123 to rotate, and the motion conversion component 123 then drives the valve sleeve 112 of the distribution module 11 to rotate.

[0023] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A mechanical closed-loop hydraulic cylinder displacement controller, characterized in that, It includes a signal input module, a distribution module, and a position mechanical feedback module. The distribution module is connected to the high-pressure oil port of the oil source and the return oil port. The signal input module outputs control to drive the distribution module. The cylinder moves linearly under the control of the distribution module. The position mechanical feedback module detects the linear displacement of the cylinder and converts the linear displacement of the cylinder into driving force according to a set gain. The driving force is fed back to the distribution module, forming a mechanical closed-loop control of the cylinder movement by the distribution module. The flow distribution module includes a valve body, a valve core, and a valve sleeve. The valve body connects the oil source and the oil cylinder. The valve core and valve sleeve built into the valve body constitute a direct-drive control valve for circumferential oil distribution. The valve core is driven by a signal input module, and the valve sleeve is driven by a position mechanical feedback module. The position mechanical feedback module includes a hydraulic cylinder connecting rod, a high-precision equally spaced position rod, a sleeve, and a motion conversion component. One end of the hydraulic cylinder connecting rod is connected to the piston end of the moving component of the hydraulic cylinder, and the other end is connected to the sleeve. The high-precision equally spaced position rod adopts a synchronous belt device, and the sleeve is a synchronous belt slide. The sleeve is sleeved on one end of the hydraulic cylinder connecting rod and moves with the hydraulic cylinder connecting rod. The sleeve drives the high-precision equally spaced position rod to rotate, and the rotation of the high-precision equally spaced position rod drives the motion conversion component to rotate. The motion conversion component then drives the valve sleeve of the flow distribution module to rotate.

2. The mechanical closed-loop hydraulic cylinder displacement controller according to claim 1, characterized in that, The rotation of the valve core controls the connection and disconnection of the high-pressure oil source with the oil cylinder and the opening degree, so that the hydraulic oil drives the oil cylinder to move linearly after passing through the valve port. The position mechanical feedback module converts the linear movement of the hydraulic cylinder into the rotation of the valve sleeve according to a predetermined lead, and the valve sleeve adaptively follows the rotation of the valve core.

3. The mechanical closed-loop hydraulic cylinder displacement controller according to claim 1 or 2, characterized in that, The signal input module includes a servo motor or stepper motor, a motor driver, and a reducer. The motor driver controls the servo motor or stepper motor to rotate according to the output pulse speed and pulse number. The rotation of the servo motor or stepper motor drives the reducer. The reducer is configured to overcome the torque of the hydraulic force of the distribution module. The output of the reducer drives the distribution module.

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