Compact digital proportional throttle cartridge valve

Abstract

The invention relates to a compact digital proportional throttling cartridge valve. A shuttle valve, a damping screw plug, a linear displacement sensor and a high-speed switch solenoid valve are arranged in a cover plate. A proportional throttling plug is arranged at the lower end of the cover plate body. The linear displacement sensor is connected to a valve core of the proportional throttling plug, and an electronic control unit is respectively connected to the linear displacement sensor and the high-speed switch solenoid valve. Control oil ports X, Z2 and Y are respectively arranged on the bottom mounting surface of the cover plate body. The control oil port X is connected to a bottom oil cavity of the proportional throttling plug, the control oil port Z2 is connected to a side oil cavity of the proportional throttling plug, and the control oil port Y is connected to an oil return channel T of the entire control loop. The control oil port X is divided into two paths through a shuttle valve, one path is directly connected to the side oil cavity of the proportional throttling plug, and the other path is connected to a control oil port a of the proportional throttling plug through a damping screw plug, and the control oil port a of the proportional throttling plug is connected to the control oil port Y through the high-speed switch solenoid valve.

Description

Technical Field

[0001] The invention relates to a proportional throttling cartridge valve, in particular to a digital proportional throttling cartridge valve. Background Art

[0002] At present, the traditional "plate valves", "superimposed valves" and their combination products based on mounting surface connection at home and abroad are facing challenges from high-power-density hydraulic products such as "threaded cartridge valves" and "two-way cartridge valves" based on cartridge connection. The high-power-density modular hydraulic control unit based on cartridge connection is in a rapid development stage. It is a high-reliability component-level product used in hydraulic equipment with medium flow (100-400L / min) requirements, with strong technical and cost advantages.

[0003] Traditional products based on two-way cartridge valve technology are mainly used in medium and large flow and power ranges of industrial hydraulics. They have limited applications, relatively low production, and weak economic and technical advantages. The overall power density of traditional plate valves and combination products is low, and they are facing withdrawal, and they are in urgent need of theoretical breakthroughs and method innovations.

[0004] In recent years, the new solution proposed by the development of MINISO compact cartridge valve technology can replace traditional structural products on a large scale, give full play to the latecomer advantage, and form a new technical system for large-scale customized hydraulic products.

[0005] As an important component of high-power modular hydraulic control units with proportional flow control functions, the proportional throttling cartridge valve has significant advantages over the proportional reversing valve based on the plate-type mounting surface.

[0006] The types of proportional throttling cartridge valves currently on the market mainly include displacement-mechanical feedback type represented by HUSCO EHPV, displacement-force feedback type represented by Eaton EPV, and displacement-electrical feedback type represented by Rexroth FES. These three types of proportional throttling cartridge valves have not occupied mainstream applications due to application limitations and relatively high prices. Taking the displacement-force feedback type as an example, since the viscosity of the oil will fluctuate over a large range with temperature changes, it will be greatly affected by the ambient temperature in specific applications. Therefore, in some scenarios with special requirements for ambient temperature, this type of proportional throttling cartridge valve will be limited; HUSCO EHPV can only be used in some specific scenarios with high requirements due to its complex internal structure and high processing difficulty.

[0007] Compared with the above two types of proportional throttle cartridge valves, the displacement-electric feedback type has obvious advantages and has been widely used. Its pilot valve is controlled by an analog signal. However, in actual application, the analog control signal is always interfered with (unwanted random changes in the signal), and the impact of these interferences may become very significant after the signal is copied many times or transmitted over long distances.

[0008] The ability of digital control signals to resist environmental interference is stronger than that of analog signals. Even if bit errors occur because the value of the interference signal exceeds the threshold range, as long as certain coding techniques are used, the erroneous signal can be easily detected and corrected. Therefore, compared with analog signals, digital signals have higher anti-interference ability during transmission, longer transmission distance, and smaller distortion amplitude.

[0009] In the prior art, the pilot valve adopts a two-position three-way proportional throttle valve. The pressure of the upper control chamber of the proportional throttle plug depends on the middle control oil port of the two-position three-way proportional throttle valve. The valve core is kept at a certain opening position through the analog control signal, thereby determining the pressure of the middle control oil port. However, the analog control signal is easily disturbed by the surrounding environment.

[0010] Therefore, a compact digital proportional throttling cartridge valve is proposed, which adopts a two-position two-way high-speed switching solenoid valve and is controlled by a digital signal to solve the shortcomings of the existing proportional throttling cartridge valves, especially the technical solutions of proportional throttling cartridge valves with diameter specifications of 16mm and 25mm. Summary of the invention

[0011] The technical problem to be solved by the present invention is to overcome the defects of the above prior art and provide a compact digital proportional throttle cartridge valve.

[0012] To achieve the above-mentioned purpose, the technical scheme of the present invention is: a compact digital proportional throttling cartridge valve, comprising a cover plate body, a proportional throttling plug-in and an electronic control unit, wherein a shuttle valve, a damping screw plug, a linear displacement sensor and a high-speed switch solenoid valve are installed in the cover plate, and a proportional throttling plug-in is installed at the lower end of the cover plate body; the linear displacement sensor is connected to the valve core of the proportional throttling plug-in to measure the displacement of the valve core, the electronic control unit is respectively connected to the linear displacement sensor and the high-speed switch solenoid valve, and the electronic control unit provides a PWM control signal to the high-speed switch solenoid valve and receives a pulse width modulation signal from the sensor. The displacement signal of the linear displacement sensor; the bottom mounting surface of the cover body is respectively provided with control oil ports X, Z2 and Y, the control oil port X is connected to the bottom oil cavity of the proportional throttling plug-in, the control oil port Z2 is connected to the side oil cavity of the proportional throttling plug-in, and the control oil port Y is connected to the return oil channel T of the entire control circuit; the control oil port X is divided into two paths by a shuttle valve, one path is directly connected to the side oil cavity of the proportional throttling plug-in, and the other path is connected to the control oil port a of the proportional throttling plug-in through a damping screw plug, and the control oil port a of the proportional throttling plug-in is connected to the control oil port Y through a high-speed switch solenoid valve.

[0013] Furthermore, when the high-speed switch electromagnet loses power, the control oil port a of the proportional throttling plug-in is connected to the return oil T.

[0014] Furthermore, the electronic control unit sends a PWM control signal to the high-speed switching solenoid valve, and two radially symmetrical triangular windows are provided at the tail end of the proportional throttling plug-in; the proportional throttling plug-in is connected and fixed to the cover plate body by a combined mounting hole arranged inside the cover plate body.

[0015] Furthermore, the axis of the linear displacement sensor coincides with the main axis of the proportional throttling plug-in.

[0016] Furthermore, the axis of the high-speed switching solenoid valve intersects with the axis of the linear displacement sensor.

[0017] Furthermore, the electronic control unit has a plug-type digital closed-loop amplifier, which is directly connected to the electrical plug of the high-speed switching solenoid valve.

[0018] Furthermore, the linear displacement sensor adopts a Hall type displacement sensor.

[0019] Furthermore, the linear displacement sensor adopts a coil type displacement sensor.

[0020] Beneficial effects of the present invention:

[0021] 1. The two-position two-way high-speed switch solenoid valve under high-frequency PWM control already has the function of a proportional valve, and to a certain extent, it is already a proportional valve. It can be used to replace the traditional two-position three-way proportional throttle valve as a pilot valve to realize digital signal control of the proportional function;

[0022] 2. Since the digital control signal has a stronger ability to resist environmental interference than the analog signal, the compact digital proportional throttle cartridge valve of the present invention has higher reliability;

[0023] 3. Part of the functions of the electronic control unit are integrated in the plug-type digital closed-loop amplifier, which is directly connected to the electrical plug of the high-speed switching solenoid valve, making the proportional throttling cartridge valve applied for by the present invention more compact.

[0024] 4. The electronic control unit provides PWM control signals to the high-speed switch solenoid valve, replacing the traditional analog signal control method and improving the anti-interference ability of the proportional throttle cartridge valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the compact digital proportional throttle cartridge valve of the present invention;

[0026] Figure 2 It is an equivalent symbol diagram of the compact digital proportional throttle cartridge valve of the present invention;

[0027] Figure 3 It is a schematic diagram of the appearance of the compact digital proportional throttle cartridge valve of the present invention;

[0028] Figure 4 It is a structural diagram of the compact digital proportional throttle cartridge valve of the present invention;

[0029] Figure 5 This is the structure diagram of a two-position two-way high-speed switch solenoid valve;

[0030] Figure numerals: 1-1-0 is a proportional throttling plug-in, 1-1-1 is a sealing assembly of the proportional throttling plug-in, 1-1-2 is a valve core with a triangular window at the tail, 1-1-3 is a valve sleeve of the proportional throttling plug-in, 1-1-4 is a spring of the proportional throttling plug-in, 1-2-0 is a cover plate body, 1-3-0 is a two-position two-way high-speed switch solenoid valve, 1-3-1 is a valve sleeve mounting seat, 1-3-2 is a push rod, 1-3-3 is a left fixed seat, 1-3-4 is a middle fixed seat, 1-3-5 is a left middle sealing seat, 1-3-6 is a spring of the proportional throttling plug-in, 1-3-7 is a spring of the proportional throttling plug-in, 1-3-8 is a spring of the proportional throttling plug-in, 1-3-9 is a spring of the proportional throttling plug-in, 1-4-10 is a spring of the proportional throttling plug-in, 1-4-11 is a spring of the proportional throttling plug-in, 1-4-12 is a spring of the proportional throttling plug-in, 1-4-13 is a spring of the proportional throttling plug-in, 1-4-14 is a spring of the proportional throttling plug-in, 1-4-15 is a spring of the proportional throttling plug-in, 1-4-16 is a spring of the proportional throttling plug-in, 1-4-17 is a spring of the proportional throttling plug-in, 1-4-18 is a spring of the proportional throttling plug-in, 1-4-19 is a spring of the proportional throttling plug-in, 1- is a spring, 1-3-7 is a sealing seat, 1-3-8 is a high-precision steel ball, 1-3-9 is a right fixed seat, 1-3-10 is a high-speed switch electromagnet, 1-4-0 is a linear displacement sensor, 1-4-1 is a trigger, 1-4-2 is a magnet, 1-4-3 is a pressure-resistant head, 1-4-4 is a sensor housing, 1-4-5 is a socket frame, 1-4-6 is a locking nut, 1-5-0 is a shuttle valve, 1-6-0 is a damping screw plug, 1-7-0 is an electronic control unit, and 1-8-0 is a plug-type digital closed-loop amplifier. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] like Figures 1 to 5 As shown, a compact digital proportional throttling cartridge valve is composed of a proportional throttling plug-in 1-1-0, a cover plate body 1-2-0, a two-position two-way high-speed switch solenoid valve 1-3-0, a linear displacement sensor 1-4-0, a shuttle valve 1-5-0, a damping screw plug 1-6-0 and an electronic control unit 1-7-0.

[0033] like Figure 1 As shown, the shuttle valve 1-5-0, the damping screw plug 1-6-0, the linear displacement sensor 1-4-0 and the two-position two-way high-speed switch solenoid valve 1-3-0 are all installed in the cover body 1-2-0. The lower end of the cover body 1-2-0 is equipped with a proportional throttling plug-in 1-1-0. The linear displacement sensor 1-4-0 is connected to the valve core 1-1-2 with a triangular window at the tail of the proportional throttling plug-in 1-1-0, and is used to measure the displacement of the valve core 1-1-2 with a triangular window at the tail. The linear displacement sensor 1-4-0 and the two-position two-way high-speed switch solenoid valve 1-3-0 are respectively connected to the electronic control unit 1-7-0. The electronic control unit 1-7-0 provides a PWM control signal to the two-position two-way high-speed switch solenoid valve 1-3-0, and receives the displacement signal of the linear displacement sensor 1-4-0.

[0034] Three control oil ports are arranged on the bottom mounting surface of the cover body 1-2-0, namely X, Z2 and Y, wherein the control oil port X is connected to the bottom oil chamber of the proportional throttling plug 1-1-0, the control oil port Z2 is connected to the side oil chamber of the proportional throttling plug 1-1-0, and the control oil port Y is connected to the return oil channel T of the entire control circuit. The control oil port X is divided into two paths through the shuttle valve 1-5-0, one path is directly connected to the side oil chamber of the proportional throttling plug 1-1-0, and the other path is connected to the control oil port a of the proportional throttling plug 1-1-0 through the damping screw plug 1-6-0, and the control oil port a of the proportional throttling plug 1-1-0 is connected to the control oil port Y through the two-position two-way high-speed switch solenoid valve 1-3-0.

[0035] Attached Figure 2 The equivalent symbol diagram of the present invention shows that the present invention provides a normally closed two-position two-way proportional throttle valve with a linear displacement sensor. Figure 3 It is a schematic diagram of the appearance of the present invention.

[0036] like Figure 4 As shown, the axes of the valve core 1-1-2, valve sleeve 1-1-3 and spring 1-1-4 coincide with each other, and together with the sealing assembly 1-1-1, they form a proportional throttling plug-in 1-1-0. The valve core 1-1-2 is placed in the valve sleeve 1-1-3, and the upper part is connected to the cover plate body 1-2-0 through the spring 1-1-4. The linear displacement sensor 1-4-0 is composed of a trigger 1-4-1, a magnet 1-4-2, a pressure-resistant head 1-4-3, a sensor housing 1-4-4, and a socket skeleton 1-4-5. The trigger 1-4-1 is connected to the valve core 1-1-2 of the proportional throttling plug-in 1-1-0 through the end thread, and is fixed and locked by a nut 1-4-6. The linear displacement sensor 1-4-0 detects the displacement of the valve core 1-1-2 during the opening or closing process through the internally arranged trigger 1-4-1, and feeds back the signal to the electronic control unit 1-7-0.

[0037] like Figure 5As shown, the high-speed switch solenoid valve 1-3-10 is mainly composed of a valve sleeve mounting seat 1-3-1, a push rod 1-3-2, a left fixed seat 1-3-3, an intermediate fixed seat 1-3-4, a left intermediate sealing seat 1-3-5, a spring 1-3-6, a sealing seat 1-3-7, a high-precision steel ball 1-3-8, a right fixed seat 1-3-9, and a high-speed switch electromagnet 1-3-10. The left fixed seat 1-3-3, the intermediate fixed seat 1-3-4, the left intermediate sealing seat 1-3-5, the sealing seat 1-3-7, and the right fixed seat 1-3-9 are installed in the valve sleeve mounting seat 1-3-1 from left to right. The left fixed seat 1-3-3, the middle fixed seat 1-3-4, the left middle sealing seat 1-3-5 and the sealing seat 1-3-7 are equipped with a push rod 1-3-2. A spring 1-3-6 is installed between the push rod 1-3-2 and the left middle sealing seat 1-3-5. The right end of the sealing seat 1-3-7 is connected to the right fixed seat 1-3-9 through a high-precision steel ball 1-3-8. The left end of the mounting seat 1-3-1 is connected to the high-speed switch electromagnet 1-3-10.

[0038] When the high-speed switch solenoid 1-3-10 of the high-speed switch solenoid valve 1-3-0 is not energized, the control oil port a of the throttling plug-in is connected to the return oil T; when the electronic control unit 1-7-0 provides a PWM signal to the high-speed switch solenoid 1-3-10 within a certain frequency range, the duty cycle and frequency of the PWM control are adjusted to control the opening or closing time ratio of the high-speed switch solenoid valve 1-3-0, so that the average opening of the steel ball 1-3-8 is maintained at a level, thereby controlling the pressure of the A port of the high-speed switch solenoid 1-3-10, and finally realizing the opening control of the valve core 1-1-2, and realizing the proportional throttling function.

[0039] Part of the functions of the electronic control unit 1-7-0 can be integrated into the plug-type digital closed-loop amplifier 1-8-0, making the proportional throttling cartridge valve of the present invention more compact and miniaturized.

[0040] In this embodiment, the high-speed switching solenoid valve, as an electro-hydraulic control element with excellent performance, not only has a fast response time, but also has a cost of about 1 / 10 of that of a servo valve and a proportional valve. The high-speed switching valve under high-frequency PWM (about 100 Hz) control already has the function of a proportional valve and is already a proportional valve to a certain extent.

[0041] In addition, the coil resistance and number of turns of the high-speed switching solenoid, the stiffness of the spring, the mass of the steel ball and the modulation frequency of PWM will all have a direct impact on the proportional switching function of the high-speed switching solenoid valve.

[0042] The tail end of the proportional throttling plug-in is provided with two radially symmetrical triangular windows; the proportional throttling plug-in is connected and fixed to the cover body by sliding in through a combined mounting hole arranged inside the cover body; the linear displacement sensor is installed on the cover body, and its axis coincides with the main axis of the proportional throttling plug-in; the high-speed switch solenoid valve is installed on the cover body, and its axis intersects with the axis of the above-mentioned linear displacement sensor. Some functions of the electronic control unit are integrated in the plug-type digital closed-loop amplifier, which is directly connected to the electric plug of the high-speed switch solenoid valve. The linear displacement sensor adopts a Hall type displacement sensor. The linear displacement sensor adopts a coil type displacement sensor. Some functions of the electronic control unit are integrated in the plug-type digital closed-loop amplifier, which is directly connected to the electric plug of the high-speed switch solenoid valve.

Claims

1. A compact digital proportional throttle cartridge valve, comprising a cover plate body, a proportional throttle plug-in and an electronic control unit, characterized in that: The cover body is equipped with a shuttle valve, a damping screw plug, a linear displacement sensor and a high-speed switch solenoid valve, and the lower end of the cover body is equipped with a proportional throttling plug-in; the linear displacement sensor is connected to the valve core of the proportional throttling plug-in to measure the displacement of the valve core, and the electronic control unit is respectively connected to the linear displacement sensor and the high-speed switch solenoid valve, and the electronic control unit provides a PWM control signal to the high-speed switch solenoid valve and receives the displacement signal of the linear displacement sensor; the bottom mounting surface of the cover body is respectively provided with control oil ports X, Z2, and Y, the control oil port X is connected to the bottom oil cavity of the proportional throttling plug-in, the control oil port Z2 is connected to the side oil cavity of the proportional throttling plug-in, and the control oil port Y is connected to the return oil channel T of the entire control circuit; the control oil port X is divided into Two paths, one path is directly connected to the side oil chamber of the proportional throttling plug-in, and the other path is connected to the control oil port a of the proportional throttling plug-in through the damping screw plug, and the control oil port a of the proportional throttling plug-in is connected to the control oil port Y through the high-speed switch solenoid valve; the electronic control unit sends a PWM control signal to the high-speed switch solenoid valve, which is used to control the opening or closing time ratio of the high-speed switch solenoid valve by adjusting the duty cycle and frequency of the PWM control, thereby controlling the pressure of the control oil port a of the proportional throttling plug-in, realizing the opening degree control of the valve core, thereby realizing the proportional throttling function; the axis of the high-speed switch solenoid valve intersects with the axis of the linear displacement sensor; the electronic control unit has a plug-type digital closed-loop amplifier, and the plug-type digital closed-loop amplifier is directly connected to the electrical plug of the high-speed switch solenoid valve.

2. The compact digital proportional throttle cartridge valve according to claim 1, characterized in that: When the high-speed switch electromagnet loses power, the control oil port a of the proportional throttling plug-in is connected to the return oil T.

3. The compact digital proportional throttle cartridge valve according to claim 1, characterized in that: The tail end of the proportional throttling plug-in is provided with two radially symmetrical triangular windows; the proportional throttling plug-in is connected and fixed to the cover plate body by sliding in through a combined mounting hole arranged inside the cover plate body.

4. The compact digital proportional throttle cartridge valve according to claim 1, characterized in that: The axis of the linear displacement sensor coincides with the main axis of the proportional throttling plug-in.

5. The compact digital proportional throttle cartridge valve according to claim 1, characterized in that: The linear displacement sensor adopts a Hall type displacement sensor.

6. The compact digital proportional throttle cartridge valve according to claim 1, characterized in that: The linear displacement sensor adopts a coil type displacement sensor.

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