CN106949112A - A kind of new-type double-valve core digital valve - Google Patents

Abstract

The invention discloses a novel double-spool digital valve, the novel double-spool digital valve includes an integrated control unit; a pilot valve; a main valve; the integrated control unit is installed on the upper end of the pilot valve; the pilot valve is installed At the upper end of the main valve, the present invention is characterized in that: the spool in the pilot valve is independently controlled by the SUPT motor, which has fast response speed and high control precision; the main valve is equipped with a pressure sensor, a displacement sensor, and a temperature sensor , can carry out spool displacement control, system pressure control, flow control, oil temperature control and other control modes, so as to determine the best dual spool combination control scheme according to the actual working conditions of the platform.

Description

A New Double Spool Digital Valve

technical field

The invention relates to the technical field of hydraulic solenoid valves, in particular to a new type of digital valve with fast response speed, high control precision, independent configuration and flexible combination of control modes.

Background technique

As an important valve in the hydraulic transmission and control system, the electro-hydraulic valve is mainly composed of a pilot valve and a main valve. The pilot valve is generally a solenoid valve reversing valve, which mainly enters the oil circuit of the main valve through a change of direction. In recent years, in order to achieve good control effect, people have changed the pilot valve from the ordinary electromagnetic directional valve to the digital valve, thus developing into an electro-hydraulic digital valve. It can directly interface with the computer without a digital/analog converter. Compared with proportional valves and servo valves, this type of valve has simple structure, good manufacturability, good repeatability, and stable and reliable work. Because it combines computer and hydraulic technology Closely combined, it has broad application prospects.

The traditional digital valve control method generally adopts the incremental control method and the pulse width modulation control method. The incremental control method mainly generates digital pulse signals through the control system to drive the stepper motor to rotate, and then converts the rotational motion of the stepper motor through a mechanical conversion device. It is a linear motion, which drives the spool to move, thereby controlling and adjusting the hydraulic parameters. However, due to the large moment of inertia of the stepping motor, after the mechanical connection with the hydraulic valve, the inertia increases and the natural frequency further decreases, so the frequency response performance is greatly limited, and even high-frequency out-of-step phenomenon occurs.

The pulse width modulation digital valve is generally a fast switching digital valve, which mainly adjusts the pulse width of the input signal to control the opening and closing of the valve and the time length of opening and closing, so as to achieve the purpose of controlling the direction, flow and pressure of the liquid flow. However, its control precision is low, its control mode is single and its structure is relatively complex. It is generally used as a separate digital valve, and is rarely used as a pilot valve.

Contents of the invention

The technical problem to be solved by the present invention is to provide a new type of digital valve with fast response speed, high control precision and independent configuration and flexible combination of control modes.

In order to achieve the above object, the present invention adopts the following technical solutions: a novel digital valve includes a central controller; a pilot valve body; a left spool; a right spool; a main valve body; a left main spool; a right main valve core;

The central controller is installed on the upper end of the pilot valve body;

The pilot valve body is installed on the upper end of the main valve body;

The left spool is installed at the left end of the pilot valve body;

The right spool is installed at the right end of the pilot valve body;

The left main valve core is located at the left end of the main valve body;

The right main valve core is located at the right end of the main valve body;

Wherein, the pilot valve body has a centrally symmetrical structure, the left valve core hole and the right valve core hole are composed of holes of different diameters, and are horizontally symmetrically distributed, the inner hole one and the inner hole two are symmetrically distributed, and the inner hole three and the inner hole Four are vertically connected, inner hole five is vertically connected with inner hole six, and the center point of round hole one is located on the same center line as the connection hole of the left valve core hole characteristic hole T1 and the connection hole of the right valve core hole characteristic hole T1' Above, round hole two is vertically connected with the characteristic hole B1 in the left valve core hole, round hole three is vertically connected with the characteristic hole B1' in the right valve core hole, and inner hole seven is respectively connected with the left valve through the oil channel. The characteristic hole P1 in the core hole and the characteristic hole P1' in the right valve core hole are connected;

The left spool is composed of shaft 1 and shaft 2, wherein shaft 2 forms a clearance fit with the left spool hole in the pilot valve body;

The right spool has the same structural size as the left spool;

The main valve body has a center-symmetrical structure, wherein the left main spool hole is composed of round holes with different diameters, the right main spool hole and the left main spool hole are symmetrically distributed, and have the same structure, and the oil port B is connected to the middle channel through the middle channel. The left main spool hole is vertically connected, the oil port A is vertically connected with the right main spool hole through the middle channel, the oil hole P' is connected with the inner hole 7 in the pilot valve body through the hole four, and the oil hole T is connected through the oil channel It is vertically communicated with the characteristic hole T2 in the left main spool hole, and is vertically connected with the characteristic hole T2' in the right main spool hole through the oil channel, and the oil hole P is connected with the left main valve through the oil channel The characteristic hole P2 in the core hole is vertically communicated with the characteristic hole P2' in the right main valve core hole through the oil channel, the hole one is vertically communicated with the left main valve core hole, and the hole seven is connected with the right main valve core hole. The main spool hole is vertically connected, and the eighth hole is vertically connected with the oil hole P;

The shape of the left main spool is composed of a shaft with no diameter, which forms a clearance fit with the hole of the left main spool of the main valve body;

The right main valve core has the same structural size as the left main valve core, and forms a clearance fit with the right main valve core hole of the main valve body.

The preferred solution also includes a left SUPT motor and a right SUPT motor, wherein the left SUPT motor shaft is connected to the left spool, then inserted into the left spool hole in the pilot valve body, and the left SUPT motor Fix it on the pilot valve body, connect the right SUPT motor shaft with the right spool, then insert it into the right spool hole in the pilot valve body, and fix the right SUPT motor on the on the pilot valve body.

The preferred solution also includes a left displacement sensor and a right displacement sensor, wherein, the upper end of the left displacement sensor is matched with the inner hole in the pilot valve body in three phases, and its wire passes through the inner hole in the pilot valve body. , its lower end extends into the inner hole in the left main valve core, similarly, the upper end of the right displacement sensor matches the inner hole six in the pilot valve body, and its wire passes through the inner hole in the pilot valve body Five passes out, and its lower end stretches in the inner hole at the top of the right main valve core.

The preferred solution also includes a left pressure sensor, a right pressure sensor, and a down pressure sensor, wherein the left pressure sensor is matched with the hole 2 in the main valve body, and its wire passes through the hole 2. Similarly, the right pressure sensor Cooperate with hole six in the main valve body, and its lead passes through hole six. Similarly, the down pressure sensor matches hole eight in the main valve body, and its lead passes through hole eight.

The preferred solution also includes a left block and a right block, wherein the left block is equipped with a sealing device to match with the lower end of the left main valve core hole in the main valve body, and the right block is fitted with a sealing device The lower end of the right main valve core hole in the main valve body matches.

Compared with the prior art, the beneficial effect is that, by adopting the above scheme, the left pilot spool and the right pilot spool of the present invention are independently controlled by the SUPT motor, with fast response speed and high control precision; the left main spool and the right main valve The spools can move independently, and the best dual-spool control scheme can be determined according to actual work requirements; it has good market application value.

Description of drawings

Fig. 1 is the structural representation of a kind of novel digital valve described in the present invention;

Fig. 2 is the pilot valve body schematic diagram of a kind of novel digital valve described in the present invention;

Fig. 3 is the left spool schematic diagram of a kind of novel digital valve described in the present invention;

Fig. 4 is the main valve body schematic diagram of a kind of novel digital valve described in the present invention;

Fig. 5 is a schematic diagram of the left main spool of a novel digital valve according to the present invention;

Fig. 6 is an application embodiment of a novel digital valve described in the present invention;

Fig. 7 is another application embodiment of a new digital valve described in the present invention.

detailed description

In order to facilitate the understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions are used in this specification for the purpose of description only.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments, and are not used to limit the present invention.

As shown in Figure 1, a new type of digital valve includes a central controller (4); pilot valve body (1); left spool (3); right spool (5); main valve body (9); Spool (14); right main spool (10);

The central controller (4) is installed on the upper end of the pilot valve body (1);

The pilot valve body (1) is installed on the upper end of the main valve body (9);

The left spool (3) is installed at the left end of the pilot valve body (1);

The right spool (5) is installed at the right end of the pilot valve body (1);

The left main valve core (14) is located at the left end of the main valve body (9);

The right main valve core (10) is located at the right end of the main valve body (9).

As shown in Figure 2, the pilot valve body (1) is a centrally symmetrical structure, and the left valve core hole (102) and the right valve core hole (104) are composed of holes of different diameters, and are horizontally symmetrically distributed. (101) and inner hole two (105) are symmetrically distributed, inner hole three (109) is vertically communicated with inner hole four (110), inner hole five (106) is vertically communicated with inner hole six (107), and round hole one (103 ) center point and the connecting hole of the left spool hole (102) characteristic hole T1 and the connecting hole of the right spool hole (104) characteristic hole T1 ' are located on the same center line, and the second round hole (111) and the The characteristic hole B1 in the left valve core hole (102) is vertically connected, the round hole three (112) is vertically connected with the characteristic hole B1' in the right valve core hole (104), and the inner hole seven (108) passes through the oil circuit The channels respectively communicate with the characteristic hole P1 in the left spool hole (102) and the characteristic hole P1' in the right spool hole (104).

As shown in Figure 3, the left spool (3) is composed of shaft one (301) and shaft two (302), wherein the second shaft (302) is connected to the left valve core hole ( 102) Create a clearance fit.

As shown in Figure 1, the right valve core (5) has the same structural size as the left valve core (3).

As shown in Figure 4, the main valve body (9) is a centrally symmetrical structure, wherein the left main valve core hole (903) is made up of circular holes of different diameters, the right main valve core hole (905) and the left main valve core The holes (903) are symmetrically distributed and have the same structure. The oil port B is vertically connected with the left main spool hole (903) through the middle channel, the oil port A is vertically connected with the right main spool hole (905) through the middle channel, and the oil hole P 'Through hole four (904) and the inner hole seven (108) in the pilot valve body (1), the oil hole T is perpendicular to the characteristic hole T2 in the left main valve core hole (903) through the oil channel communicate with each other through the oil channel and vertically communicate with the characteristic hole T2' in the right main spool hole (905), and the oil hole P is perpendicular to the characteristic hole P2 in the left main spool hole (903) through the oil channel It is connected vertically with the characteristic hole P2' in the right main spool hole (905) through the oil channel, the hole one (901) is vertically connected with the left main spool hole (903), and the hole seven (907) It is vertically communicated with the right main spool hole (905), and the eighth hole (908) is vertically communicated with the oil hole P.

As shown in Fig. 5, the shape of the left main valve core (14) is composed of a shaft with no diameter, and forms a clearance fit with the left main valve core hole (903) of the main valve body (9).

As shown in Figure 1, the right main valve core (10) has the same structural size as the left main valve core (14), and forms a gap with the right main valve core hole (905) of the main valve body (9) Cooperate.

As shown in Figure 1, it also includes a left SUPT motor (2) and a right SUPT motor (6), wherein the shaft of the left SUPT motor (2) is connected with the left spool (3), and then inserted into the pilot The left spool hole (102) in the valve body (1) fixes the left SUPT motor (2) on the pilot valve body (1), and also connects the right SUPT motor (6) shaft with the The right spool (5) is connected, and then inserted into the right spool hole (104) in the pilot valve body (1), and the right SUPT motor (6) is fixed on the pilot valve body (1);

As shown in Figure 1, it also includes a left displacement sensor (16) and a right displacement sensor (7), wherein the upper end of the left displacement sensor (16) is in contact with the inner hole three (109) in the pilot valve body (1) Cooperate, its wire passes through the inner hole 4 (110) in the described pilot valve body (1), and its lower end stretches into the inner hole (1401) in the described left main valve core (14), similarly, the described The upper end of the right displacement sensor (7) is matched with the inner hole six (107) in the pilot valve body (1), and its wire passes through the inner hole five (106) in the pilot valve body (1). The lower end extends into the inner hole at the top of the right main valve core (10).

As shown in Figure 1, also comprise left pressure sensor (15), right pressure sensor (8), downward pressure sensor (12), wherein, left pressure sensor (15) and the hole two in the main valve body (9) (902), and its wire passes through hole two (902). Similarly, the right pressure sensor (8) is matched with hole six (906) in the main valve body (9), and its wire passes through the hole Six (906) passes through, and similarly, the lower pressure sensor (12) is matched with the hole eight (908) in the main valve body (9), and its lead passes through the hole eight (908);

As shown in Figure 1, it also includes a left plug (13) and a right plug (11), wherein the left plug (13) is connected to the left main valve core hole in the main valve body (9) after the sealing device is installed. The lower end of (903) matches, and the described right blockage (11) is matched with the lower end of the right main valve core hole (905) in the main valve body (9) after installing sealing device.

Fig. 6 is an application example of a new type of digital valve described in the present invention. In this example, the control requirement is that the rodless cavity of the hydraulic cylinder: the control mode is flow control, which realizes the control of a certain speed of the hydraulic rod piston. Precise control; the hydraulic cylinder has a rod cavity: the control model is pressure control, which realizes zero back pressure control.

The control process is: the central controller (4) outputs control current to the right SUPT motor (6), the right SUPT motor (6) drives the right spool (5) to move to a certain position to the left, and the P1' port and A1' port are connected , the TI' port and the B1' port are connected, and the control oil with a certain pressure and flow enters the P1' port from the P' port, then enters the A1' port, and enters the upper end of the right main spool (10) through the A1' port, and pushes the right The main spool (10) moves downward for a certain distance, the right main valve port opens (the size of the opening is proportional to the pressure of the oil flowing into the upper chamber), and the P2' port is connected to the A port. According to the flow formula q=K _L · A·(P ₁ -P ₂ ) ^m , combined with the pressure difference value △P(△P=P ₁ -P ₂ ) of the pressure sensor in the main valve, where, P ₁ —the output value of the lower pressure sensor (12), P ₂ — The output value of the right pressure sensor (8)) and the displacement signal of the spool are compared with the accurate calibration value obtained from a large number of tests. The port enters the rodless cavity of the hydraulic cylinder, and pushes the piston rod of the hydraulic rod to run at a fixed speed, so as to realize the precise control of the piston speed of the hydraulic cylinder;

At the same time, the central controller (4) sends a control current signal to the left SUPT motor (2), and the left SUPT motor (2) drives the left spool (3) to move to the left, and the movement displacement is controlled by the input current. Port is connected, port A1 and port T1 are connected, the control oil circuit flows from port P' to port P1, then enters port B1, passes through hole 2 (111) on the pilot valve body (1), and connects to hole 2 ( 111) The external oil pipe on the top enters hole 1 (901) of the main valve body (9), and finally flows into the cavity at the lower end of the left main spool (14), pushing the left main spool (14) to move upwards, B port and T2 The oil in the rod cavity of the hydraulic cylinder enters the T port from the B port and the T2 port, and then flows out of the oil tank from the T port. The pressure value is measured by the left pressure sensor (15) in real time, and the pressure value is fed back to the The central controller (4) adjusts the output signal in time and corrects the input signal of the left SUPT motor (2) after comparing with the precise calibration values obtained from a large number of tests, so as to ensure the minimum back pressure control.

Fig. 7 is another application embodiment of a new type of digital valve described in the present invention. In this embodiment, the control requirement is: to carry out precise displacement control on the displacement of the pistons of the two hydraulic cylinders respectively, and the control process is: central control The device (4) sends a control signal to the left SUPT motor (2), and the left SUPT motor (2) drives the left spool (3) to displace the corresponding distance, and the left pilot valve port opens (the opening size is related to the input current of the left SUPT motor), The pilot valve controls the oil to enter the P1 port from the P' port, then enter the A1 port, and finally enter the cavity at the upper end of the left main spool (14), pushing the left main spool (14) to move downward, and the movement amount is determined by the left displacement sensor ( 16) Real-time detection, and the detection signal is converted into an electrical signal, which is transmitted to the central controller (4) through the wire, compared with the given control signal, and the error value is transmitted to the left SUPT motor (2) through the comparison and amplification link, so that the real-time Adjust the output control signal of the left SUPT motor (2) to achieve precise control of the displacement of the left main spool (14), the left main spool (14) moves downward, the valve port opens, and the oil in the main oil circuit flows from port P , Port P2 enters Port B, and enters the left hydraulic control rodless chamber through Port B. According to the flow formula q=K _L ·A·(P ₁ -P ₂ ) ^m , combined with the pressure difference value of the pressure sensor in the main valve △P( △P＝P ₁ -P ₂ , where, P ₁ —the output value of the down pressure sensor (12), P ₂ —the output value of the right pressure sensor (8)) and the displacement signal of the spool, realize the oil entering the left hydraulic control rodless cavity Accurate control of the liquid volume, and finally realize the displacement of the hydraulic cylinder piston precise control. The control principle of the right hydraulic cylinder is the same as that of the left hydraulic cylinder.

In addition, it should be noted that this specification and its accompanying drawings 6 and 7 are application embodiments of the present invention, and it does not mean that the present invention only has these two application embodiments. For example, one hydraulic motor can be precisely controlled at different speeds. For example, two or more hydraulic motors can be controlled at different speeds at the same time or at the same time. For example, two or more hydraulic motors can be controlled at the same time. Cylinders can be controlled at different speeds at the same time or at the same speed at the same time. For example, three or more hydraulic cylinders can be controlled at the same speed at different times or at different speeds at different times. For example, each hydraulic cylinder can be controlled at different speeds and different speeds. Stress control, etc.

In addition, it should be noted that all equivalent or simple changes made according to the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention.

Claims (8)

1. A novel dual spool digital valve, characterized in that: comprising an integrated control unit (3); pilot valve (1); main valve (2); The integrated control unit (3) is installed on the upper end of the pilot valve (1); The pilot valve (1) is installed on the upper end of the main valve (2). 2. A novel double-spool digital valve according to claim 1, characterized in that the pilot valve (1) comprises a pilot valve body (101), a left spool (103), a right spool (104) ; Wherein, the pilot valve body (101) has a center-symmetrical structure, and the left valve core hole (101B) and the right valve core hole (101D) are composed of holes of different diameters, and are horizontally symmetrically distributed, and the inner hole one (101K) and The second inner hole (101E) is symmetrically distributed, the third inner hole (101I) is vertically connected with the fourth inner hole (101J), the fifth inner hole (101F) is vertically connected with the sixth inner hole (101G), and the center point of the first circular hole (101C) is connected with the The connecting hole of the characteristic hole T1 of the left spool hole (101B) and the connecting hole of the characteristic hole T1' of the right spool hole (101D) are located on the same center line, and the second round hole (101M) and the left spool The characteristic hole B1 in the hole (101B) is vertically connected, the round hole three (101N) is vertically connected with the characteristic hole B1' in the right spool hole (101D), and the inner hole seven (101H) is respectively connected to the left The characteristic hole P1 in the spool hole (101B) and the characteristic hole P1' in the right spool hole (101D) are connected; The left valve core (103) is composed of a shaft one (103A) and a shaft two (103B), wherein the shaft two (103B) forms a clearance fit with the left valve core hole (101B) in the pilot valve body (101); The right valve core (104) has the same structural size as the left valve core (103). 3. A novel double-spool digital valve according to claim 1, characterized in that, the pilot valve (1) also includes a left SUPT motor (102) and a right SUPT motor (105), wherein the left SUPT motor (105) The shaft of the SUPT motor (102) is connected with the left spool (103), and then inserted into the left spool hole (101B) in the pilot valve body (101), and the left SUPT motor (102) is fixed on the On the pilot valve body (101), also connect the right SUPT motor (105) shaft with the right spool (104), and then insert it into the right spool hole (101D) in the pilot valve body (101) ), fix the right SUPT motor (105) on the pilot valve body (101). 4. A novel dual-spool digital valve according to claim 1, characterized in that the main valve (2) comprises a main valve body (210), a left main spool (204), a right main spool ( 208); Wherein, the main valve body (210) has a centrally symmetrical structure, the left main valve core hole (210E) is composed of round holes with different diameters, and the right main valve core hole (210G) and the left main valve core hole (210E) are symmetrically distributed , and have the same structure, oil port B is vertically communicated with the left main spool hole (210E) through the middle channel, oil port A is vertically communicated with the right main spool hole (210G) through the middle channel, and oil port P' is connected vertically through hole four (210F ) is communicated with the inner hole seven (101H) in the pilot valve body (101), the oil hole T is vertically communicated with the characteristic hole T2 in the left main spool hole (210E) through the oil passage, and through the oil passage It is vertically communicated with the characteristic hole T2' in the right main spool hole (210G), and the oil hole P is vertically connected with the characteristic hole P2 in the left main spool hole (210E) through the oil channel, and through the oil channel It is vertically communicated with the characteristic hole P2' in the right main spool hole (210G), hole one (210L) is vertically connected with the left main spool hole (210E), and hole seven (210J) is connected with the right main valve The core hole (210G) is vertically connected, and the eighth hole (210K) is vertically connected with the oil hole P; The shape of the left main spool (204) is composed of a shaft with no diameter, and forms a clearance fit with the left main spool hole (210E) of the main valve body (210); The right main valve core (208) has the same structural size as the left main valve core (204), and forms a clearance fit with the right main valve core hole (210G) of the main valve body (210). 5. A novel double-spool digital valve according to claim 1, characterized in that said main valve (2) also includes a left displacement sensor (201) and a right displacement sensor (212), wherein said left The displacement sensor (201) is installed in the inner hole three (101I) of the pilot valve body (101) in the pilot valve (1), and its wire passes through the inner hole four (101J) in the pilot valve body (101) Its lower end stretches into the inner hole (204A) in the left main valve core (204) in the main valve (2). Similarly, the upper end of the right displacement sensor (212) is installed on the pilot valve body ( In the inner hole six (101G) in 101), its wire passes through the inner hole five (101F) in the pilot valve body (101), and its lower end extends into the inner hole at the top of the right main valve core (208) middle. 6. A novel dual-spool digital valve according to claim 1, characterized in that said main valve (2) also includes a left pressure sensor (202), a right pressure sensor (211), a down pressure sensor (206 ), wherein, the left pressure sensor (202) is installed in the hole three (210D) in the main valve body (210), and its wire passes through the hole three (210D), similarly, the right pressure sensor ( 211) is installed in the hole six (210H) in the main valve body (210), and its wire passes through the hole six (210H). Similarly, the lower pressure sensor (206) is installed in the main valve body (210) In hole eight (210K) in, its lead passes through hole eight (210K). 7. A novel double-spool digital valve according to claim 1, characterized in that said main valve (2) also includes a left temperature sensor (203) and a right temperature sensor (211), wherein said left The temperature sensor (203) is installed in hole two (210C) in the main valve body (210), and the right temperature sensor (211) is installed in hole five (210I) in the main valve body (210) . 8. A novel dual-spool digital valve according to claim 1, characterized in that said main valve (2) also includes a left plug (205) and a right plug (207), wherein said left plug ( 205) Install a sealing device on the lower end of the left main valve core hole (210E) in the main valve body (210), and install a sealing device on the right plug (207) and install it on the main valve body (210E). ) in the lower end of the right main spool hole (210G).