Decimal electro-hydraulic digital valve driven by double motors and flow adjusting method of decimal electro-hydraulic digital valve

Abstract

The invention relates to a double-motor-driven decimal electro-hydraulic digital valve and a flow adjusting method thereof, high-position output and low-position output are respectively realized by matching two sets of valve cores with a valve sleeve, the through-flow area of throttling holes of the high-position valve core and the low-position valve core is 10: 1, the valve cores are driven by motors to rotate, different flow distribution holes are combined with the throttling holes, and the flow rate of the decimal electro-hydraulic digital valve is adjusted. Multi-numerical-value flow output can be achieved without a switch valve, the defects of a traditional digital valve and the defects that a double-nozzle baffle valve is poor in anti-pollution capacity and high in manufacturing cost are overcome, and the valve has the advantages of being good in linearity, high in repeated precision, high in anti-pollution capacity, simple in structure, reliable in work and the like.

Description

Technical Field

[0001] This invention relates to the field of electro-hydraulic digital valves, specifically to a dual-motor driven decimal electro-hydraulic digital valve and its flow regulation method. Background Technology

[0002] Electro-hydraulic digital valves are control valves with discrete output values. Compared with electro-hydraulic servo valves and electro-hydraulic proportional valves, they have advantages such as high repeatability, good linearity, no hysteresis, stable and reliable operation, low price, and strong anti-interference and anti-pollution capabilities. They have partially replaced electro-hydraulic proportional valves or electro-hydraulic servo valves and are a brand-new valve type that will compete with and promote each other in the future.

[0003] Currently, electro-hydraulic digital valves can be mainly classified into binary coded digital valves, incremental digital valves, and high-speed switching digital valves according to their flow regulation methods. Binary coded digital valves consist of a large number of switching valves with only two states: open and closed, corresponding to 0 and 1. The more switching valves used, the more flow rates can be regulated. The biggest drawback of this type of valve is the need for a large number of expensive high-speed switching valves. Incremental digital valves use a stepper motor to drive the valve core, controlling the valve opening size. The output flow rate is proportional to the motor rotation angle. The biggest drawback of this type of valve is that the flow control accuracy is limited by the motor's resolution and the dynamic response speed is relatively slow. High-speed switching digital valves regulate the flow rate by controlling the duty cycle to allow the valve to switch on and off at high speeds. The larger the duty cycle, the greater the output flow rate. This type of valve has a smaller flow rate, and the high-speed switching of the valve core can cause flow shocks and pulsations. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a dual-motor driven decimal electro-hydraulic digital valve and its flow regulation method, which has advantages such as high repeatability, good linearity, small hysteresis, stable and reliable operation, low price, and strong anti-interference and anti-pollution capabilities.

[0005] To achieve the above objectives, the technical solution adopted by this invention is as follows: a dual-motor driven decimal electro-hydraulic digital valve, comprising a valve body, a valve sleeve, and a valve core. The valve sleeve is fixed within the valve body, and the valve core is rotatably installed within the valve sleeve. The valve sleeve includes a high-position valve sleeve and a low-position valve sleeve, both coaxially mounted at both ends of the valve body. The valve core includes a high-position valve core and a low-position valve core. The high-position valve core is installed within the high-position valve sleeve and connected to a high-position stepper motor, and the low-position valve core is installed within the low-position valve sleeve and connected to a low-position stepper motor. The high-position valve sleeve and the low-position valve sleeve have the same structure. Each valve sleeve is provided with an A-port annular oil groove and a B-port annular oil groove. The A-port annular oil groove has N equally sized A-port flow distribution holes evenly spaced on a 180° semicircular surface. The B-port annular oil groove has B-port flow distribution holes of the same number and size as the A-port flow distribution holes evenly spaced on a 180° semicircular surface opposite to the A-port flow distribution holes. The high-position valve core has N equally sized A-port flow distribution holes evenly spaced on the same 180° semicircular surface. N throttling orifices corresponding to the B-port distribution orifice and N throttling orifices corresponding to the A-port distribution orifice are evenly spaced on the semi-circular surface. The low-position valve core and the high-position valve core have the same structure, only the size of the throttling orifice is different. The flow area ratio of the throttling orifice of the high-position valve core to that of the low-position valve core is 10:1. The valve body is provided with a digital valve inlet and a digital valve return port. The digital valve inlet is divided into a digital valve body A-port supply channel and a digital valve body B-port supply channel. The digital valve body A-port supply channel connects to the A-port annular oil groove of the two valve sleeves, and the digital valve body B-port supply channel connects to the B-port annular oil groove of the two valve sleeves. The valve core is hollow inside. The digital valve return port is connected to the internal channel of the valve core. The connection of the high-position oil port is achieved by the high-position motor driving the high-position valve core to rotate, and the connection of the low-position oil port is achieved by the low-position motor driving the low-position valve core to rotate. The output flow of the digital valve is the sum of the flow through the high-position oil port and the low-position oil port.

[0006] Furthermore, the valve sleeve has nine equally sized A-port flow distribution holes and nine equally sized B-port flow distribution holes at 20° intervals on opposite 180° semicircular surfaces, and the valve core has nine equally sized A-port throttling holes and nine equally sized B-port throttling holes at 20° intervals on the same 180° semicircular surface.

[0007] Furthermore, the valve body is provided with digital valve port A and digital valve port B, which are connected to the outside. Digital valve port A is connected to the oil supply channel of digital valve body port A, and digital valve port B is connected to the oil supply channel of digital valve body port B.

[0008] Furthermore, an oil pan is provided below the valve body. The oil pan has an oil pan inlet, an oil pan supply channel, an oil pan throttle orifice A, an oil pan throttle orifice B, an oil pan A port, an oil pan B port, and an oil pan return port. The oil pan inlet is connected to the oil pan supply channel, which is connected to the oil pan throttle orifice A and the oil pan throttle orifice B. The outlet of the oil pan throttle orifice A is connected to the oil pan A port and the oil pan control port A, respectively. The outlet of the oil pan throttle orifice B is connected to the oil pan B port and the oil pan control port B, respectively. The oil pan control port A and the oil pan control port B are connected to the actuator.

[0009] Furthermore, the oil pan port B and the digital valve port B are connected, the oil pan port A and the digital valve port A are connected, and the valve body return port and the oil pan return port are connected.

[0010] Furthermore, the pressure of oil pan control port A is controlled by the high-position port A and low-position port A of the digital valve, and the pressure of oil pan control port B is controlled by the high-position port B and low-position port B of the digital valve. By controlling the output changes of digital valve port A and digital valve port B, the pressure difference between oil pan control port A and oil pan control port B is controlled, thereby controlling the movement of the actuator.

[0011] Furthermore, the valve body is provided with mounting holes for installing a high-position valve sleeve and a low-position valve sleeve. The two mounting holes are symmetrically distributed at both ends of the valve body, and the valve sleeve is installed in the mounting holes and is interference-fitted with the valve body.

[0012] According to the above-mentioned flow regulation method of a decimal electro-hydraulic digital valve driven by dual motors, the control quantity of the digital valve is an integer. The control quantity of the digital valve is realized by both the high-level output and the low-level output. The tens digit of the control quantity of the digital valve is realized by the high-level output, and the units digit of the control quantity of the digital valve is realized by the low-level output. The high-level stepper motor drives the high-level valve core to rotate in the high-level valve sleeve to realize the corresponding high-level output. The low-level stepper motor drives the low-level valve core to rotate in the low-level valve sleeve to realize the corresponding low-level output. The output of port A of the digital valve is composed of the outputs of the high-level port A and the low-level port A. The output of port B of the digital valve is composed of the outputs of the high-level port B and the low-level port B.

[0013] Furthermore, the control quantity of the digital valve is an integer between 0 and 99. The sum of the high-level outputs of the digital valve is 90, that is, the sum of the outputs of high-level port A and high-level port B is 90. If the control quantity of high-level port A is 90, 80, 70, 60, 50, 40, 30, 20, 10, 0, then the corresponding control quantity of high-level port B is 0, 10, 20, 30, 40, 50, 60, 70, 80, 90. The sum of the low-level outputs of the digital valve is 9, that is, the sum of the outputs of low-level port A and low-level port B is 9. If the control quantity of low-level port A is 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, then the corresponding control quantity of high-level port B is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. The high-level outputs and low-level outputs combine to form the output flow of the digital valve, and the sum of the output flow of the digital valve is always 99.

[0014] Furthermore, the control quantity of the digital valve is an integer between 0 and 99. The high-position stepper motor receives control quantities in units of 10 within the range of 0 to 90. For every 10 increase in the control quantity, the high-position valve core rotates 20 degrees clockwise within the high-position valve sleeve. The low-position stepper motor receives control quantities in units of 1 within the range of 0 to 9. For every 1 increase in the control quantity, the low-position valve core rotates 20 degrees clockwise within the low-position valve sleeve.

[0015] Beneficial effects: The present invention relates to a dual-motor driven decimal electro-hydraulic digital valve, which achieves high-level and low-level outputs through two sets of valve cores and valve sleeves respectively. The flow area of ​​the throttling orifice of the high-level valve core and the low-level valve core is 10:1. The motor drives the valve core to rotate, so that different flow distribution orifices are combined with the throttling orifice. This allows for the output of most flow values ​​without the need for a switch valve. It avoids the disadvantages of traditional digital valves and the disadvantages of dual-nozzle baffle valves, such as poor anti-contamination ability and high manufacturing cost. It has the advantages of good linearity, high repeatability, strong anti-contamination ability, simple structure, and reliable operation. Moreover, it is inexpensive, has a fast response, and a large output flow. In computer-controlled electro-hydraulic control systems, this electro-hydraulic digital valve has a promising application prospect. Attached Figure Description

[0016] Figure 1 A 3D schematic diagram of a digital valve; Figure 2 A schematic cross-sectional view of a digital valve along the valve body axis; Figure 3 This is a schematic cross-sectional view of the digital valve along the return port of the valve body on the right. Figure 4 This is a top-view cross-sectional diagram of a digital valve along the valve body axis. Figure 5 This is a cross-sectional view of the high-position valve core and high-position valve sleeve along the annular oil groove at port A of the high-position valve sleeve. Figure 6A cross-sectional view of the annular oil groove along the B port of the high-position valve sleeve of the high-position valve core; Figure 7 A cross-sectional view of the annular oil groove along the A port of the low-position valve sleeve of the low-position valve core; Figure 8 A cross-sectional view of the annular oil groove along the B port of the low-position valve sleeve of the low-position valve core. Figure 9 This is a schematic diagram of the oil flow direction in a digital valve.

[0017] Attached reference numerals: 1 High-position stepper motor, 2 Screw, 3 Valve body, 4 Low-position valve sleeve, 5 Low-position valve core, 6 High-position valve core, 7 Annular oil groove at port A of low-position valve sleeve, 8 Annular oil groove at port B of low-position valve sleeve, 9 Annular oil groove at port B of high-position valve sleeve, 10 Annular oil groove at port A of high-position valve sleeve, 11 Valve core return port / valve body channel, 12 Oil return channel of oil base plate, 13 Oil inlet of oil base plate, 14 Valve body return port, 15 Oil return port of oil base plate, 16 High-position valve sleeve; 17 Distribution hole at port A of low-position valve sleeve (the corresponding 9 holes are represented by 17-1 to 17-9 respectively); 18 Low-position valve sleeve B port distribution hole (the corresponding 9 holes are represented by 18-1 to 18-9 respectively); 19. High-position valve sleeve A port distribution hole (the corresponding 9 holes are represented by 19-1 to 19-9 respectively); 20 High-position valve sleeve B port distribution hole (the corresponding 9 holes are represented by 20-1 to 20-9 respectively); 21 Low-position stepper motor; 22 Oil pan control port B; 23 Oil pan throttle orifice B; 24 Oil pan throttle orifice A; 25 Oil pan control port A; 26 Oil pan port B; 27 Oil pan port A; 28 Digital valve port B; 29 Digital valve port A; 30 Digital valve body port A oil supply channel; 31 Digital valve body port B oil supply channel; 32 Oil pan supply channel; 33 Low-position valve core port B throttle orifice (the corresponding 9 holes are represented by 33-1 to 33-9 respectively); 34 Low-position valve core A-port throttling orifice (the corresponding 9 orifices are represented by 34-1 to 34-9 respectively); 35 High-position valve core B port throttling orifice (the corresponding 9 holes are represented by 35-1 to 35-9 respectively); 36 High-position valve core A-port throttling orifice (the corresponding 9 holes are represented by 36-1 to 36-9 respectively). Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1-4As shown, a decimal electro-hydraulic digital valve driven by dual motors includes a valve body 3, a valve sleeve, a valve core, and a stepper motor. The valve core is installed inside the valve sleeve. After the valve core and the valve sleeve are combined, they are installed inside the valve body 3. The valve sleeve is fixed inside the valve body 3. The valve core is driven by the stepper motor to rotate inside the valve sleeve.

[0020] Specifically, the valve sleeve includes a high-position valve sleeve 16 and a low-position valve sleeve 4, the valve core includes a high-position valve core 6 and a low-position valve core 5, and the stepper motor includes a high-position stepper motor 1 and a low-position stepper motor 21; the valve body 3 has mounting holes for installing the high-position valve sleeve 16 and the high-position valve core 6, and the low-position valve sleeve 4 and the low-position valve core 5, such as... Figure 1 As shown, the two mounting holes are symmetrical and coaxially distributed. The high-position valve sleeve 16 and the low-position valve sleeve 4 are both interference-fitted with the valve body 3 and fixed inside the valve body 3. The high-position valve core 6 is installed in the high-position valve sleeve 16 with clearance fit, and the low-position valve core 5 is installed in the low-position valve sleeve 4 with clearance fit. The high-position stepper motor 1 is connected to the high-position valve core 6, and the low-position stepper motor 21 is connected to the low-position valve core 5. The high-position stepper motor 1 and the low-position stepper motor 21 are respectively fixed to the valve body 3 by screws 2. The high-position stepper motor 1 drives the high-position valve core 6 to rotate in the high-position valve sleeve 16 to control the high-position output, and the low-position stepper motor 21 drives the low-position valve core 5 to rotate in the low-position valve sleeve 4 to control the low-position output. The low-position output and the high-position output are combined to form the output of the digital valve.

[0021] The valve sleeve is provided with flow distribution holes. The high-position valve sleeve 16 and the low-position valve sleeve 4 have the same structure. Each valve sleeve has two annular oil grooves on its outer circumferential surface. Each annular oil groove has a row of flow distribution holes. Each valve sleeve has two rows of flow distribution holes. Each row of nine flow distribution holes is distributed circumferentially on the 180° semicircular surface of the valve sleeve at 20° intervals. The two rows of flow distribution holes on the same valve sleeve are distributed on two opposite 180° semicircular surfaces (i.e., the two semicircular surfaces are on opposite sides in the circumferential direction and do not overlap at all). The two rows of flow distribution holes on the same valve sleeve are located at different axial positions. The outer circumferential surface of the valve sleeve corresponding to each row of flow distribution holes is provided with annular oil grooves. The two annular oil grooves are not connected to each other.

[0022] Specifically, the two annular oil grooves on the high-position valve sleeve 16 are the high-position valve sleeve B-port annular oil groove 9 and the high-position valve sleeve A-port annular oil groove 10. The high-position valve sleeve B-port annular oil groove 9 has nine equally sized high-position valve sleeve B-port flow distribution holes 20 spaced 20° apart on the 180° semicircular surface of the high-position valve sleeve 16. The high-position valve sleeve A-port annular oil groove 10 has nine high-position valve sleeve A-port flow distribution holes 19 located on the opposite side of the high-position valve sleeve B-port flow distribution holes 20.

[0023] The two annular oil grooves on the low-position valve sleeve 4 are the low-position valve sleeve A-port annular oil groove 7 and the low-position valve sleeve B-port annular oil groove 8. Nine equal-sized low-position valve sleeve B-port flow distribution holes 18 are opened on the 180° semicircular surface of the low-position valve sleeve at 20° intervals. Nine low-position valve sleeve A-port flow distribution holes 17 are opened on the opposite side of the low-position valve sleeve B-port flow distribution holes 18 in the low-position valve sleeve A-port annular oil groove 7.

[0024] Corresponding to the flow distribution holes on the valve sleeve, the valve core is provided with throttling holes. The cross-sectional area of ​​the flow distribution holes on the valve sleeve is much larger than the cross-sectional area of ​​the throttling holes on the valve core. Each valve core has two rows of throttling holes, with a total of 9 throttling holes in each row. The 9 throttling holes of equal size are distributed circumferentially on the 180° semicircular surface of the valve core at 20° intervals. The two rows of throttling holes on the same valve core are distributed on the same 180° semicircular surface (i.e., the two semicircular surfaces are on the same side in the circumferential direction). The two rows of throttling holes on the same valve core are located at different axial positions. The axial positions of the two rows of throttling holes on the valve core correspond to the axial positions of the two rows of flow distribution holes on the valve sleeve. The high-position valve core 6 and the low-position valve core 5 have the same structure, only the size of the throttling holes is different. The flow area of ​​the throttling holes on the high-position valve core 6 is ten times that of the throttling holes on the low-position valve core 5, that is, the ratio of their flow areas is 10:1.

[0025] Specifically, the high-position valve core 6 has nine high-position valve core A-port throttling holes 36 corresponding to the high-position valve sleeve A-port distribution hole 19 and a high-position valve core B-port throttling hole 35 corresponding to the high-position valve sleeve B-port distribution hole 20 on its 180° semicircular surface. The high-position valve core A-port throttling holes 36 are arranged on the same side as the high-position valve sleeve B-port throttling holes 35.

[0026] The low-position valve core 5 has nine low-position valve core A-port throttling orifices 34 corresponding to the low-position valve sleeve A-port flow distribution orifice 17 and nine low-position valve core B-port throttling orifices 33 corresponding to the low-position valve sleeve B-port flow distribution orifice 18 on its 180° semicircular surface. The low-position valve core B-port throttling orifices 33 are arranged on the same side as the low-position valve sleeve A-port throttling orifices 34. The flow area ratio of the throttling orifice of the high-position valve core 6 to the throttling orifice of the low-position valve core 5 is 10:1.

[0027] Based on the above-mentioned distribution orifice and throttling orifice settings, the distribution orifice 20 at port B of the high-position valve sleeve is combined with the throttling orifice 35 at port B of the high-position valve core, the distribution orifice 19 at port A of the high-position valve sleeve is combined with the throttling orifice 36 at port A of the high-position valve core, the distribution orifice 18 at port B of the low-position valve sleeve is combined with the throttling orifice 33 at port B of the low-position valve core, and the distribution orifice 17 at port A of the low-position valve sleeve is combined with the throttling orifice 34 at port A of the low-position valve core.

[0028] The valve body is equipped with a digital valve inlet and a digital valve return port 14. The digital valve inlet is divided into two channels: digital valve body A-port oil supply channel 30 and digital valve body B-port oil supply channel 31. Digital valve body A-port oil supply channel 30 connects to the high-position valve sleeve A-port annular oil groove 10 and the low-position valve sleeve A-port annular oil groove 7. Digital valve body B-port oil supply channel 31 connects to the high-position valve sleeve B-port annular oil groove 9 and the low-position valve sleeve B-port annular oil groove 8. The valve body 3 is also equipped with digital valve A-port 29 and digital valve B-port 28 that communicate with the outside. Digital valve A-port 29 connects to the digital valve body A-port oil supply channel 31 inside the valve body. 0 is connected, digital valve B port 28 is connected to digital valve body B port oil supply channel 31 in the valve body; digital valve body A port oil supply channel 30 supplies oil to the high-position valve sleeve A port annular oil groove 10 and low-position valve sleeve A port annular oil groove 7, digital valve body B port oil supply channel 31 supplies oil to the high-position valve sleeve B port annular oil groove 9 and low-position valve sleeve B port annular oil groove 8; low-position valve core 5 and high-position valve core 6 are hollow inside, high-position valve core 6 is coaxial with low-position valve core 5, digital valve return port 14 is connected to the internal channel of valve core, and oil flows back to the oil tank through valve body channel 11 and digital valve return port 14.

[0029] The connection of the high-position oil port is achieved by the high-position stepper motor 1 driving the high-position valve core 6 to rotate, and the connection of the low-position oil port is achieved by the low-position stepper motor 21 driving the low-position valve core 5 to rotate. The output flow of the digital valve is the sum of the flow through the high-position oil port and the low-position oil port.

[0030] like Figure 1-3 As shown, an oil pan is provided below the valve body 3. The oil pan is provided with an oil pan inlet 13, an oil pan supply channel 32, an oil pan throttle orifice A24, an oil pan throttle orifice B23, an oil pan A port 27, an oil pan B port 26, an oil pan control oil port A25, an oil pan control oil port B22, an oil pan return oil port 15, and an oil pan return channel 12.

[0031] The oil inlet 13 of the oil pan is connected to the oil supply channel 32 of the oil pan. The oil supply channel 32 of the oil pan is connected to the oil pan throttle orifice A24 and the oil pan throttle orifice B23. The outlet of the oil pan throttle orifice A24 is connected to the oil pan A port 27 and the oil pan control oil port A25 respectively. The outlet of the oil pan throttle orifice B23 is connected to the oil pan B port 26 and the oil pan control oil port B22 respectively. The oil pan control oil port A25 and the oil pan control oil port B22 are connected to the actuator.

[0032] like Figure 2-4As shown in Figure 9, the oil enters from the oil inlet 13 of the oil pan and flows into the oil supply port 32 of the oil pan, which is divided into two paths. One path flows through the oil pan throttle hole B23, oil pan port B26, and digital valve port B28 into the digital valve body port B supply channel 31 to supply oil to the annular oil groove 8 of the low-position valve sleeve port B and the annular oil groove 9 of the high-position valve sleeve port B, and flows through the throttle hole B23 to the oil pan control port B22. The other path flows through the oil pan throttle hole A24, oil pan port A27, and digital valve port A29 into the digital valve body port A supply channel 30 to supply oil to the annular distribution groove 10 of the high-position valve sleeve port A and the annular distribution groove of the low-position valve sleeve port A, and flows through the throttle hole A24 to the oil pan control port A25.

[0033] The oil entering the throttle orifice A24 of the oil pan is diverted to the oil pan A port 27 and the oil pan control port A25. The oil entering the throttle orifice B23 of the oil pan is diverted to the oil pan B port 26 and the oil pan control port A22. Therefore, the combination of the high position B port and the low position B port generates pressure control oil pan control port B22, and the combination of the high position A port and the low position A port generates pressure control oil pan control port A25.

[0034] The low-position valve core 5 and the high-position valve core 6 are hollow inside. After the oil enters the annular oil groove, it enters the valve core through the combination of the distribution hole and the throttling hole. The digital valve return port 14 is connected to the internal channel of the valve core. The oil in the valve core flows into the oil pan return port 15 through the valve body channel 11 and the digital valve return port 14, and then flows back to the oil tank through the oil pan return channel 12.

[0035] In this embodiment, the digital valve control quantity is 0-99. The high-order output is responsible for the control quantity in the tens place, and the low-order output is responsible for the control quantity in the units place. If m+n represents the control quantity of the digital valve, where m represents a multiple of 10 between 0 and 90 and n represents an integer between 0 and 9, then m+n is an integer between 0 and 99. m is the high-order control quantity of the digital valve, and n is the low-order control quantity of the digital valve. The high-order output is responsible for the output corresponding to m, and the low-order output is responsible for the output corresponding to n. For example, if the input digital valve control quantity is 76, then the high-order valve core is responsible for the output corresponding to the control quantity 70, and the low-order valve core is responsible for the output corresponding to the control quantity 6.

[0036] The high-position stepper motor 1 drives the high-position valve core 6 to rotate within the high-position valve sleeve 16, controlling the output of high-position oil. The engagement pattern between the high-position valve core 6 and the high-position valve sleeve 16 is as follows: Figure 5 and Figure 6 As shown. The high-position valve sleeve B-port flow distribution orifice 20 is connected to the high-position valve core B-port throttling orifice 35, and the high-position valve sleeve A-port flow distribution orifice 19 is connected to the high-position valve core A-port throttling orifice 36. (As shown) Figure 5 and 6As shown, initially, the flow distribution holes 19-1~19-9 at port A of the high-position valve sleeve and the throttling holes 36-1~36-9 at port A of the high-position valve core are located on the same side and correspond one-to-one, with the control quantity at port A being 90. The flow distribution holes 20-1~20-9 at port B of the high-position valve sleeve and the throttling holes 35-1~35-9 at port B of the high-position valve core are located on opposite sides, with the control quantity at port B being 0. When the digital valve control quantity of 10 is input, the high-position stepper motor 1 drives the high-position stepper motor 1 to move the high-position valve core to the correct position. The high-position valve core 6 rotates clockwise 20°. At this time, the high-position valve sleeve B port distribution hole 35-9 and the high-position valve core B port throttling hole 20-9 are combined to generate the high-position B port control quantity 10. The high-position valve sleeve A port distribution hole 36-2-36-9 are combined with the high-position valve core A port throttling hole 19-1-19-8 respectively to generate the high-position A port control quantity 80. When the digital valve control quantity 20 is input, the high-position stepper motor 1 drives the high-position valve core 6 clockwise. Rotating the clockwise direction by 40°, the flow distribution holes 35-8~35-9 at port B of the high-position valve sleeve combine with the throttling holes 20-8~20-9 at port B of the high-position valve core, generating a control quantity of 20 at port B. Similarly, the flow distribution holes 36-3~36-9 at port A of the high-position valve sleeve combine with the throttling holes 19-1~19-7 at port A of the high-position valve core, generating a control quantity of 70 at port A. This process continues, with each increase of 10 in the control quantity causing the high-position stepper motor 1 to rotate clockwise by 2. At 0 degrees, for every 10 decrease in the control quantity, the high-position stepper motor 1 rotates counterclockwise by 20 degrees. The control quantity at high-position A port plus the control quantity at high-position B port equals 90. The high-position control quantity of the digital valve changes from 0 to 90, sequentially generating the control quantities at high-position A port as 90, 80, 70, 60, 50, 40, 30, 20, 10, and 0, and the control quantities at high-position B port as 0, 10, 20, 30, 40, 50, 60, 70, 80, and 90.

[0037] The connection pattern between the low-position valve core 5 and the low-position valve sleeve 4 is as follows: Figure 7 and Figure 8As shown, the flow distribution hole 18 at the B port of the low-position valve sleeve is connected to the throttling hole 33 at the B port of the low-position valve core, and the flow distribution hole 17 at the A port of the low-position valve sleeve is connected to the throttling hole 34 at the A port of the low-position valve core. Initially, the throttling orifice 34-1-34-9 at port A of the low-position valve core and the distribution orifice 17-1-17-9 at port A of the low-position valve sleeve are located on the same side and correspond one-to-one, generating a low-position A-port control quantity 9. The distribution orifices 18-1~18-9 at port B of the low-position valve sleeve and the throttling orifices 33-1~33-9 at port B of the low-position valve core are located on opposite sides and are not connected, generating a low-position B-port control quantity 0. When the input digital valve control quantity 1 is input, the low-position stepper motor 21 drives the low-position valve core 5 to rotate 20° clockwise. The throttling orifice 34-2-34-9 at port A of the low-position valve core combines with the distribution orifice 17-2-17-9 at port A of the low-position valve sleeve, generating a low-position A-port control quantity 8. The distribution orifice 18-9 at port B of the low-position valve sleeve combines with the throttling orifice 33-1 at port B of the low-position valve core, generating a low-position B-port control quantity 1. When the input digital valve control quantity is 2, the low-position stepper motor 21 drives the low-position valve core 5 to rotate 20° clockwise. When the valve core 5 rotates clockwise by 40°, the flow distribution holes 18-8 to 18-9 at the B port of the low-position valve sleeve combine with the throttling holes 33-1 to 33-2 at the B port of the low-position valve core, generating a low-position B port control quantity 2. Similarly, the flow distribution holes 17-3 to 17-9 at the A port of the low-position valve sleeve combine with the throttling holes 34-3 to 34-9 at the A port of the low-position valve core, generating a low-position A port control quantity 7. This process continues. For every increase of 1 in the low-position control quantity of the digital valve, the low-position stepper motor 21 rotates clockwise by 20°. For every decrease of 1 in the low-position control quantity of the digital valve, the low-position stepper motor 21 rotates counterclockwise by 20°. The sum of the low-position A port control quantity and the low-position B port control quantity equals 9. The low-position control quantity of the digital valve varies from 0 to 9, generating low-position A port control quantities of 9, 8, 7, 6, 5, 4, 3, 2, 1, and 0, and low-position B port control quantities of 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.

[0038] The high-position valve core 6 combines with the low-position valve core 5, supplying oil to the annular oil groove 7 at the low-position valve sleeve A and the annular oil groove 10 at the high-position valve sleeve A through the oil supply channel 30 at port A of the digital valve body. The oil supply channel at port B of the digital valve body supplies oil to the oil groove 8 at port B of the low-position valve core and the oil groove 9 at port B of the high-position valve core. The high-position output and the low-position output combine to form the control quantity of the digital valve. The sum of the flow rates of the high-position output and the low-position output is 99. When the high-position A and low-position A combine to form the digital value 11, the high-position B and low-position B combine to form the digital value 88. The relationship between the two is A + B = 9. 9; Based on different digital valve control values, the high-position A port and the low-position A port combine to produce different A port control values, and the high-position B port and the low-position B port combine to produce different B port control values; Since the pressure of the oil pan control port A25 is controlled by the high-position A port and the low-position A port, and the pressure of the oil pan control port B22 is controlled by the high-position B port and the low-position B port, the pressure difference between the oil pan control port A25 and the oil pan control port B22 can be controlled by changing the digital valve control value from 0 to 99, thereby controlling the movement of the actuator (such as a hydraulic cylinder).

[0039] In the above embodiments, the flow distribution holes on the valve sleeve and the throttling holes on the valve core are both set in nines at 20° intervals on a 180° semicircular surface. Of course, the technical solution of the present invention is not limited to this. In actual applications, technicians can uniformly set other numbers of flow distribution holes and throttling holes on the semicircular surface as needed. Other structures and principles are the same as those in the above embodiments.

[0040] The digital valve of this invention can solve the problems of existing binary coded electro-hydraulic digital valves requiring a large number of high-speed switching valves, incremental electro-hydraulic digital valves having slow dynamic response, and high-speed switching valves having small flow rates and large flow impacts. It has the advantages of high repeatability, good linearity, small hysteresis, stable and reliable operation, low price, and strong anti-interference and anti-pollution capabilities.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A decimal electro-hydraulic digital valve driven by dual motors, comprising a valve body, a valve sleeve, and a valve core, wherein the valve sleeve is fixed within the valve body, and the valve core is rotatably mounted within the valve sleeve, characterized in that, The valve sleeve includes a high-position valve sleeve and a low-position valve sleeve, both coaxially mounted at both ends of the valve body. The valve core includes a high-position valve core and a low-position valve core. The high-position valve core is installed inside the high-position valve sleeve and connected to a high-position stepper motor, while the low-position valve core is installed inside the low-position valve sleeve and connected to a low-position stepper motor. The high-position valve sleeve and the low-position valve sleeve have the same structure. Each valve sleeve is provided with an A-port annular oil groove and a B-port annular oil groove. The A-port annular oil groove has N equally sized A-port flow distribution holes evenly spaced on a 180° semicircular surface. The B-port annular oil groove has B-port flow distribution holes of the same number and size as the A-port flow distribution holes evenly spaced on a 180° semicircular surface opposite to the A-port flow distribution holes. The high-position valve core has N B-port throttling holes corresponding to the B-port flow distribution holes and N A-port flow distribution holes evenly spaced on the same 180° semicircular surface. The valve has N corresponding A-port throttling orifices. The low-position valve core and the high-position valve core have the same structure, only the size of the throttling orifice is different. The flow area ratio of the throttling orifice of the high-position valve core to that of the low-position valve core is 10:

1. The valve body is equipped with a digital valve inlet and a digital valve return port. The digital valve inlet is divided into a digital valve body A-port oil supply channel and a digital valve body B-port oil supply channel. The digital valve body A-port oil supply channel connects to the A-port annular oil groove of the two valve sleeves, and the digital valve body B-port oil supply channel connects to the B-port annular oil groove of the two valve sleeves. The valve core is hollow inside. The digital valve return port is connected to the internal channel of the valve core. The connection of the high-position oil port is achieved by the high-position motor driving the high-position valve core to rotate, and the connection of the low-position oil port is achieved by the low-position motor driving the low-position valve core to rotate. The output flow of the digital valve is the sum of the flow through the high-position oil port and the low-position oil port.

2. The dual-motor driven decimal electro-hydraulic digital valve according to claim 1, characterized in that, The valve sleeve has nine equal-sized A-port flow distribution holes and nine equal-sized B-port flow distribution holes at 20° intervals on opposite 180° semicircular surfaces. The valve core has nine equal-sized A-port throttling holes and nine equal-sized B-port throttling holes at 20° intervals on the same 180° semicircular surface.

3. The dual-motor driven decimal electro-hydraulic digital valve according to claim 1, characterized in that, The valve body is equipped with digital valve port A and digital valve port B, which are connected to the outside. Digital valve port A is connected to the oil supply channel of digital valve body port A, and digital valve port B is connected to the oil supply channel of digital valve body port B.

4. A dual-motor driven decimal electro-hydraulic digital valve according to claim 3, characterized in that, An oil pan is located below the valve body. The oil pan has an oil pan inlet, an oil pan supply channel, an oil pan throttle orifice A, an oil pan throttle orifice B, an oil pan A port, an oil pan B port, and an oil pan return port. The oil pan inlet is connected to the oil pan supply channel, which is connected to the oil pan throttle orifice A and the oil pan throttle orifice B. The outlet of the oil pan throttle orifice A is connected to both the oil pan A port and the oil pan control port A. The outlet of the oil pan throttle orifice B is connected to both the oil pan B port and the oil pan control port B. The oil pan control ports A and B are connected to the actuator.

5. A dual-motor driven decimal electro-hydraulic digital valve according to claim 4, characterized in that, The oil pan port B and the digital valve port B are connected, the oil pan port A and the digital valve port A are connected, and the valve body return port and the oil pan return port are connected.

6. A dual-motor driven decimal electro-hydraulic digital valve according to claim 4, characterized in that, The pressure of oil pan control port A is controlled by the high-position port A and low-position port A of the digital valve, and the pressure of oil pan control port B is controlled by the high-position port B and low-position port B of the digital valve. By controlling the output changes of digital valve A and digital valve B, the pressure difference between oil pan control port A and oil pan control port B is controlled, thereby controlling the movement of the actuator.

7. A dual-motor driven decimal electro-hydraulic digital valve according to claim 1, characterized in that, The valve body has mounting holes for installing a high-position valve sleeve and a low-position valve sleeve. The two mounting holes are symmetrically distributed at both ends of the valve body. The valve sleeve is installed in the mounting holes and is interference-fitted with the valve body.

8. A flow regulation method for a dual-motor driven decimal electro-hydraulic digital valve according to any one of claims 1-7, characterized in that, The control quantity of the digital valve is an integer. The high-order output and low-order output together realize the control quantity of the digital valve. The tens digit of the digital valve control quantity is realized by the high-order output, and the units digit of the digital valve control quantity is realized by the low-order output. The high-order stepper motor drives the high-order valve core to rotate in the high-order valve sleeve to realize the corresponding high-order output. The low-order stepper motor drives the low-order valve core to rotate in the low-order valve sleeve to realize the corresponding low-order output. The output of port A of the digital valve is composed of the outputs of port A (high-order) and port B (low-order).

9. The flow rate regulation method according to claim 8, characterized in that, The control quantity of the digital valve is an integer between 0 and 99. The sum of the high-level outputs of the digital valve is 90, that is, the sum of the outputs of high-level port A and high-level port B is 90. If the control quantity of high-level port A is 90, 80, 70, 60, 50, 40, 30, 20, 10, 0, then the corresponding control quantity of high-level port B is 0, 10, 20, 30, 40, 50, 60, 70, 80, 90. The sum of the low-level outputs of the digital valve is 9, that is, the sum of the outputs of low-level port A and low-level port B is 9. If the control quantity of low-level port A is 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, then the corresponding control quantity of high-level port B is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. The high-level outputs and low-level outputs combine to form the output flow rate of the digital valve, and the sum of the output flow rates of the digital valve is always 99.

10. The flow rate regulation method according to claim 8, characterized in that, The control quantity of the digital valve is an integer between 0 and 99. The high-position stepper motor receives control quantities in units of 10 within the range of 0 to 90. For every 10 increase in the control quantity, the high-position valve core rotates 20 degrees clockwise within the high-position valve sleeve. The low-position stepper motor receives control quantities in units of 1 within the range of 0 to 9. For every 1 increase in the control quantity, the low-position valve core rotates 20 degrees clockwise within the low-position valve sleeve.

Images