A two-stage proportional servo valve based on voice coil motor drive

Abstract

The present invention discloses a two-stage proportional servo valve driven by a voice coil motor, which belongs to the field of hydraulics and is mainly composed of a main body, a main valve core, a pilot valve core and a partition, wherein a fan-shaped groove and a positioning groove are provided on the outer circumferential wall of the main valve core; the pilot valve core is slidably arranged in the main valve core; the partition can extend into the fan-shaped groove and the positioning groove; when the partition extends into the fan-shaped groove, the partition divides the fan-shaped groove into a first control chamber and a second control chamber, and the pilot valve core reciprocates in the main valve core to control the pressure of the oil in the first control chamber and the second control chamber, thereby driving the main valve core to reciprocate in the main body; when the partition extends into the positioning groove, the main valve core is fixed and cannot rotate, and the oil in the main body cannot flow into the main valve core; the present invention has a compact structure and a high degree of integration, and the pilot valve core can be replaced without disassembling the main body, so that the maintenance work is safer, more convenient and faster; at the same time, the control of the main valve core is more precise.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic technology, and in particular relates to a two-stage proportional servo valve driven by a voice coil motor. Background Art

[0002] Servo valve is the core component of hydraulic servo system, and electro-hydraulic servo valve is commonly used at present. Electro-hydraulic servo valve is both an electro-hydraulic conversion element and a power amplifier element, which can convert low-power electrical signal input into high-power hydraulic energy (flow and pressure) output. The hydraulic servo valve has the advantages of flexible control, high precision, and large output power; therefore, it has important and extensive uses in the fields of aviation, aerospace, metallurgy, experimental equipment, radar, ships, weapons, etc. The electro-hydraulic servo valve of the prior art generally installs the pilot valve on the main valve, which is connected through the flow channel on the main valve body to control the main valve core to work. This usage method will make the overall size of the electro-hydraulic servo valve larger and have more parts; at the same time, when the electro-hydraulic servo valve is in use, it is necessary to accurately adjust the movement of the main valve core, so it is necessary to control the movement of the pilot valve core to switch the oil circuit at a high frequency, which makes the pilot valve core severely worn and has a short life, and needs to be replaced and maintained frequently. However, when maintaining the electro-hydraulic servo valve, it is first necessary to shut down the system, then remove the electro-hydraulic servo valve from the pipeline, and finally remove the pilot valve core for replacement, which makes the maintenance time longer and consumes a lot of manpower. At the same time, it will also affect the operation of the entire hydraulic system, which is not conducive to the widespread use of the electro-hydraulic servo valve. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a two-stage proportional servo valve driven by a voice coil motor.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions, a two-stage proportional servo valve driven by a voice coil motor, this embodiment includes a main body, a main valve core, a pilot valve core and a partition; the main valve core is rotatably connected in the main body, and a fan-shaped groove and a positioning groove are provided on the outer circumferential wall of the main valve core; the pilot valve core is slidably arranged in the main valve core; the partition is slidably arranged in the main body, and the partition can extend into the fan-shaped groove and the positioning groove; when the partition extends into the fan-shaped groove, the partition divides the fan-shaped groove into a first control chamber and a second control chamber, and the pilot valve core reciprocates in the main valve core to control the pressure of the oil in the first control chamber and the second control chamber, thereby driving the main valve core to reciprocate; when the partition extends into the positioning groove, the main valve core is fixed and cannot rotate, and the oil in the main body cannot flow into the main valve core.

[0005] Preferably, the two-stage proportional servo valve driven by a voice coil motor also includes a transition block; the transition block is rotatably connected to the main body, and the main body is provided with a cover annular groove and a straight groove, one end of the straight groove is connected to the cover annular groove, and the other end extends to the right end surface of the main body; a limit plate is radially provided on the transition block, and the limit plate can slide in the cover annular groove and the straight groove; a follower hole is provided on the right end surface of the main valve core, and a connecting pin is provided on the left side of the transition block, and the connecting pin extends into the follower hole.

[0006] Preferably, the two-stage proportional servo valve driven by a voice coil motor also includes a diaphragm spring, a lock plate and a torsion spring; the diaphragm spring is arranged in the main body to drive the diaphragm to slide in the direction close to the axis of the main valve core; the lock plate is rotatably connected in the main body; the torsion spring is arranged in the lock plate to drive the lock plate to rotate in the direction close to the diaphragm.

[0007] Preferably, the two-stage proportional servo valve driven by a voice coil motor also includes a first spring seat, a second spring seat, a valve core spring and a connecting rod; the connecting rod is slidably connected in the transition block, and one end of the connecting rod is detachably connected to the right end of the pilot valve core; the first spring seat and the second spring seat are sleeved on the connecting rod facing each other; the valve core spring is arranged between the first spring seat and the second spring seat to drive the first spring seat and the second spring seat to move away from each other.

[0008] Preferably, the two-stage proportional servo valve driven by a voice coil motor further comprises a voice coil motor, the voice coil motor is fixedly connected to the transition block, and the output shaft of the voice coil motor is detachably connected to the right end of the connecting rod.

[0009] Preferably, the main body comprises a valve body and a valve cover; the valve body is provided with an A port, a B port, a P port and a T port; the valve cover is fixedly connected to the right side of the valve body, and the cover annular groove and the straight groove are both located in the valve cover.

[0010] Preferably, a first switching groove, a second switching groove and a third switching groove are provided on the outer circumferential wall of the main valve core; when the partition extends into the fan-shaped groove, the first switching groove is connected to the P port, and the second switching groove and the third switching groove are both connected to the T port, and the main valve core can control the on-off relationship between the first switching groove, the second switching groove, the third switching groove and the A port, the B port; when the partition extends into the positioning groove, the first switching groove, the second switching groove, the third switching groove and the P port, the T port, the A port, the B port are all isolated and blocked.

[0011] Preferably, a valve core cavity is provided in the main valve core, and the first switching groove, the third switching groove, the first control cavity and the second control cavity are all connected to the valve core cavity, and the pilot valve core moves back and forth in the valve core cavity to control the on-off relationship between the first switching groove, the third switching groove and the first control cavity, and the second control cavity.

[0012] Preferably, a first main channel and a second main channel are further provided in the main valve core; the left end of the first main channel is arc-shaped and extends to the left end surface of the main valve core, and the other end is connected with the first switching groove; the left end of the second main channel is arc-shaped and extends to the left end surface of the main valve core, and the second switching groove and the third switching groove are both connected with the second main channel; when the main valve core rotates reciprocatingly, the first main channel is connected with the P port, and the second main channel is connected with the T port; when the main valve core is fixed, the first main channel and the second main channel are disconnected from the P port and the T port.

[0013] Preferably, the two-stage proportional servo valve driven by a voice coil motor further comprises an angle sensor, wherein the angle sensor is fixedly connected to the valve body, and the output shaft of the angle sensor is fixedly connected to the main valve core.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] 1. By setting a rotatable main valve core and partition, when the pilot valve core needs to be replaced, it is only necessary to pull out the partition and rotate the main valve core to block the oil passages connected to the pilot valve core. The main valve core and the transition block can be rotated at the same time, and the limit plate and the straight groove can be controlled to align to unlock the transition block. In this way, the transition block and the pilot valve core can be removed at the same time, so that the pilot valve core can be removed without disassembling the main body, making maintenance convenient and quick;

[0016] 2. By arranging the pilot valve core in the main valve core and dividing the fan-shaped groove into the first control chamber and the second control chamber by the partition plate, the main valve core can be controlled to rotate by controlling the pilot valve core to change the direction of the oil circuit, thereby changing the direction of the oil circuit in the valve body, so that the present invention has a compact structure and a high degree of integration;

[0017] 3. By setting a positioning groove on the main valve core, when the partition can extend into the positioning groove, the main valve core is locked, so that the main valve core can block all ports A, B, P and T, and the oil will not flow into the valve core cavity, making the replacement work safer;

[0018] 4. By setting up a voice coil motor and an angle sensor, the voice coil motor can drive the pilot valve core to change the direction of the pilot oil circuit, and then drive the main valve core to rotate. Since the main valve core and the output shaft of the angle sensor are fixedly connected, the angle sensor can detect the rotation angle of the main valve core, thereby sending a feedback signal. The voice coil motor is then controlled by the electronic control system to drive the pilot valve core to move, thereby adjusting the position of the main valve core, making the control more precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of the present invention;

[0020] Figure 2 For the present invention Figure 1 Section view in the AA direction;

[0021] Figure 3 For the present invention Figure 1 Cross-sectional view in the middle BB direction;

[0022] Figure 4 For the present invention Figure 1 Cross-sectional view in CC direction;

[0023] Figure 5 For the present invention Figure 1 Cross-sectional view in the middle DD direction;

[0024] Figure 6 For the present invention Figure 1 Cross-sectional view in the EE direction;

[0025] Figure 7 For the present invention Figure 1 Cross-sectional view in the FF direction;

[0026] Figure 8 For the present invention Figure 1 Cross-sectional view in the middle GG direction;

[0027] Fig. 9 It is a cross-sectional view of the main valve core of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] Combination Figure 1-Figure 9As shown, the two-stage proportional servo valve driven by a voice coil motor in this embodiment includes a main body 1, a main valve core 2, a pilot valve core 3 and a partition 71; the main valve core 2 is rotatably connected in the main body 1, and a fan-shaped groove 25 and a positioning groove 26 are provided on the outer circumferential wall of the main valve core 2; the pilot valve core 3 is slidably arranged in the main valve core 2; the partition 71 is slidably arranged in the main body 1, and the partition 71 can extend into the fan-shaped groove 25 and the positioning groove 26; when the partition 71 extends into the fan-shaped groove 25, the partition 71 divides the fan-shaped groove 25 into a first control chamber 251 and a second control chamber 252, and the pilot valve core 3 reciprocates in the main valve core 2 to control the pressure of the oil in the first control chamber 251 and the second control chamber 252, thereby driving the main valve core 2 to reciprocate in the main body 1; when the partition 71 extends into the positioning groove 26, the main valve core 2 is fixed and cannot rotate, and the oil in the main body 1 cannot flow into the main valve core 2.

[0030] During specific operation, the fan-shaped groove 25 is divided into a first control chamber 251 and a second control chamber 252 by the partition 71, so that the reciprocating movement of the pilot valve core 3 can change the flow direction of the oil in the main valve core 2, thereby controlling the pressure in the first control chamber 251 and the second control chamber 252, and driving the main valve core 2 to rotate reciprocatingly.

[0031] During operation, the partition plate 71 extends into the positioning groove 26 to fix the main valve core 2, and the flow of oil in the main body 1 can be blocked through the side wall of the main valve core 2, thereby preventing the oil from flowing into the main valve core 2. In this way, the oil circuit on the main body 1 can be cut off from the main valve core 2, and when replacing the pilot valve core 3, it is not necessary to remove the main body 1 from the pipeline, making maintenance more convenient and quick.

[0032] Combination Figure 1 , Figure 2 As shown, the two-stage proportional servo valve driven by the voice coil motor also includes a transition block 55; the transition block 55 is rotatably connected to the main body 1, and a cover annular groove 121 and a straight groove 122 are provided on the main body 1, one end of the straight groove 122 is connected to the cover annular groove 121, and the other end extends to the right end surface of the main body 1; a limit plate 551 is radially provided on the transition block 55, and the limit plate 551 can slide in the cover annular groove 121 and the straight groove 122; a follower hole 24 is provided on the right end surface of the main valve core 2, and a connecting pin 552 is provided on the left side of the transition block 55, and the connecting pin 552 extends into the follower hole 24.

[0033] During specific operation, by setting the limit plate 551 to slide in the cover annular groove 121 and the straight groove 122, when the main valve core 2 rotates back and forth, the limit plate 551 slides in the cover annular groove 121. Since the connecting pin 552 extends into the follower hole 24, the transition block 55 can rotate with the main valve core 2, and the transition block 55 will not hinder the operation of the main valve core 2. When the pilot valve core 3 needs to be removed, the main valve core 2 can be driven to rotate by rotating the transition block 55, so that the positioning groove 26 comes to the side of the partition 71, and then the partition 71 extends into the positioning groove 26 to fix the main valve core 2, so that the outer circumferential wall of the main valve core 2 blocks the oil circuit in the main body 1. Since the limit plate 551 and the straight groove 122 are aligned at this time, the transition block 55 can be pulled outward, so that the limit plate 551 slides out along the straight groove 122, the transition block 55 is quickly removed, and the pilot valve core 3 is pulled out at the same time, so that there is no need to disassemble the main body 1, and the pilot valve core 3 can be quickly replaced.

[0034] Combination Figure 1 As shown, the two-stage proportional servo valve driven by the voice coil motor also includes a diaphragm spring 72, a lock plate 73 and a torsion spring 74; the diaphragm spring 72 is arranged in the main body 1 to drive the diaphragm 71 to slide in the direction close to the axis of the main valve core 2; the lock plate 73 is rotatably connected in the main body 1; the torsion spring 74 is arranged in the lock plate 73 to drive the lock plate 73 to rotate in the direction close to the diaphragm 71.

[0035] During specific operation, by setting the partition spring 72, the partition 71 can be kept in the positioning groove 26 and the fan-shaped groove 25 under the action of the partition spring 72; by setting the locking plate 73 and the torsion spring 74, when the partition 71 extends into the fan-shaped groove 25, under the action of the torsion spring 74, the locking plate 73 can lock the partition 71 to prevent the partition 71 from exiting the fan-shaped groove 25 due to the increase in pressure in the first control chamber 251 or the second control chamber 252.

[0036] Combination Figure 1 As shown, the two-stage proportional servo valve driven by the voice coil motor also includes a first spring seat 51, a second spring seat 52, a valve core spring 53 and a connecting rod 54; the connecting rod 54 is slidably connected in the transition block 55, and one end of the connecting rod 54 is detachably connected to the right end of the pilot valve core 3; the first spring seat 51 and the second spring seat 52 are sleeved on the connecting rod 54 facing each other; the valve core spring 53 is arranged between the first spring seat 51 and the second spring seat 52, so as to drive the first spring seat 51 and the second spring seat 52 to move away from each other.

[0037] Combination Figure 1 As shown, the two-stage proportional servo valve based on voice coil motor drive also includes a voice coil motor 6, the voice coil motor 6 and the transition block 55 are fixedly connected, and the output shaft of the voice coil motor 6 and the right end of the connecting rod 54 are detachably connected.

[0038] Combination Figure 1, Figure 2 , Figure 5 As shown, the main body 1 includes a valve body 11 and a valve cover 12; the valve body 11 is provided with an A port, a B port, a P port and a T port; the valve cover 12 is fixedly connected to the right side of the valve body 11, and the cover annular groove 121 and the straight groove 122 are both located in the valve cover 12.

[0039] Combination Figure 1 , Figure 5 , Fig. 9 As shown, a first switching groove 231, a second switching groove 232 and a third switching groove 233 are provided on the outer circumferential wall of the main valve core 2; when the partition 71 extends into the fan-shaped groove 25, the first switching groove 231 is connected to the P port, and the second switching groove 232 and the third switching groove 233 are both connected to the T port, and the main valve core 2 can control the on-off relationship between the first switching groove 231, the second switching groove 232, the third switching groove 233 and the A port and the B port; when the partition 71 extends into the positioning groove 26 and the main valve core 2 is fixed, the first switching groove 231, the second switching groove 232, the third switching groove 233 and the P port, the T port, the A port and the B port are all blocked.

[0040] During specific operation, by providing a first switching groove 231, a second switching groove 232 and a third switching groove 233, when the main valve core 2 rotates counterclockwise, the first switching groove 231 can be driven to connect with port A, and port B can be driven to connect with the third switching groove 233; when the main valve core 2 rotates clockwise, the first switching groove 231 can be driven to connect with port B, and port A can be driven to connect with the second switching groove 232; the switching relationship between the first switching groove 231, the second switching groove 232, the third switching groove 233 and port A and port B is realized.

[0041] Combination Figure 1 , Figure 3-Figure 7 , Fig. 9 As shown, a valve core cavity is provided in the main valve core 2, and the first switching groove 231, the third switching groove 233, the first control cavity 251 and the second control cavity 252 are all connected to the valve core cavity. The pilot valve core 3 moves back and forth in the valve core cavity to control the on-off relationship between the first switching groove 231, the third switching groove 233 and the first control cavity 251, the second control cavity 252.

[0042] Combination Figure 1 , Figure 5-Figure 9As shown, a first main channel 21 and a second main channel 22 are also provided in the main valve core 2; the left end of the first main channel 21 is arc-shaped and extends to the left end surface of the main valve core 2, and the other end is connected with the first switching groove 231; the left end of the second main channel 22 is arc-shaped and extends to the left end surface of the main valve core 2, and the second switching groove 232 and the third switching groove 233 are both connected with the second main channel 22; when the main valve core 2 rotates reciprocatingly, the first main channel 21 is connected with the P port, and the second main channel 22 is connected with the T port; when the main valve core 2 is fixed, the first main channel 21 and the second main channel 22 are disconnected from the P port and the T port.

[0043] Combination Figure 1 As shown, the two-stage proportional servo valve driven by the voice coil motor further includes an angle sensor 4 , the angle sensor 4 is fixedly connected to the valve body 11 , and the output shaft of the angle sensor 4 is fixedly connected to the main valve core 2 .

[0044] During specific operation, after the pilot valve core 3 is driven by the voice coil motor 6 to change the direction of the pilot oil circuit, the main valve core 2 can be driven to rotate. Since the main valve core 2 and the output shaft of the angle sensor 4 are fixedly connected, the angle sensor 4 can detect the rotation angle of the main valve core 2, thereby sending a feedback signal. The voice coil motor 6 is then controlled by the electronic control system to drive the pilot valve core 3 to move, thereby adjusting the position of the main valve core 3 to make the control more precise.

[0045] The working principle of this two-stage proportional servo valve based on voice coil motor drive is as follows:

[0046] When the present invention is working normally, the partition 71 extends into the fan-shaped groove 25, and the high-pressure oil enters from the P port and then flows into the first main flow channel 21 and the first switching groove 231. Since the connecting rod 54 is connected to the pilot valve core 3 by a hook, the output shaft of the voice coil motor 6 is detachably connected to the connecting rod 54, and the movement of the pilot valve core 3 can be controlled by the voice coil motor 6; when the connecting rod 54 moves to the right, it drives the first spring seat 51 to overcome the valve core spring 53 to move to the right, and then drives the pilot valve core 3 to move to the right, so that the first switching groove 231 and the second control chamber 252 are connected, and the third switching groove 233 and the first control chamber 251 are connected, so that the high-pressure oil at the P port enters the second control chamber 252, and at the same time, the oil in the first control chamber 251 passes through the third switching groove 233 and the second main flow channel 22 and then is discharged from the T port, so that the main valve core 2 rotates counterclockwise (see Figure 3 , Figure 5), so that the first switching groove 231 is connected to the A port, and the B port is connected to the third switching groove 233, so that the oil in the first main flow channel 21 flows out from the A port through the first switching groove 231 and enters the actuator, and at the same time, the oil passing through the actuator enters from the B port, passes through the third switching groove 233 and the second main flow channel 22 and flows out from the T port; when the connecting rod 54 moves to the left, it drives the second spring seat 52 to overcome the valve core spring 53 to move to the left, and then drives the pilot valve core 3 to move to the left, so that the first switching groove 231 is connected to the first control chamber 251, and the third switching groove 233 is connected to the second control chamber 252, so that the high-pressure oil at the P port enters the first control chamber 251, and at the same time, the oil in the second control chamber 252 passes through the third switching groove 233 and the second main flow channel 22 and is then discharged from the T port, so that the main valve core 2 rotates clockwise (see Figure 3 , Figure 5 ), thereby connecting the first switching groove 231 with the B port, and connecting the A port with the second switching groove 232, so that the oil in the first main flow channel 21 flows out from the B port through the first switching groove 231 and enters the actuator, and at the same time, the oil passing through the actuator enters from the A port, flows out from the T port through the second switching groove 232 and the second main flow channel 22. Since the oil drives the main valve core 2 to rotate, the main valve core 2 is fixedly connected with the extended shaft of the angle sensor 4, and then the rotation angle of the main valve core 2 is detected by the angle sensor 4, so that the angle sensor 4 generates a feedback electrical signal, which is processed by the electronic control system, and then the voice coil motor 6 is controlled to drive the pilot valve core 3 to move, so as to control the pilot oil circuit, and then adjust the main valve core 2, so that the present invention works normally.

[0047] When the present invention is used for a long time and the pilot valve core 3 needs to be replaced, first, the torsion spring 74 is overcome to rotate the lock plate 73. When the lock plate 73 is away from the partition plate 71, the partition plate spring 72 is overcome to pull the partition plate 71 outward. When the partition plate 71 withdraws from the first control chamber 251 and the second control chamber 252, the transition block 55 is driven to rotate 180 degrees, so that the limit plate 551 rotates along the annular groove 121 of the cover and aligns with the straight groove 122. Since the connecting pin 552 extends into the follower hole 24, the main valve core 2 is driven to rotate 180 degrees, so that the partition plate 71 and the positioning groove 26 are aligned. When the partition plate spring 72 pushes the partition plate 71 into the positioning groove 26 to position the main valve core 2, the outer wall of the main valve core 2 blocks the A port and the B port, and the left end face of the main valve core 2 blocks the P port and the T port, so that the external oil does not enter the valve core cavity, and then the transition block 55 is pulled outward, so that the limit plate 551 slides along the straight groove 122 and withdraws from the valve cover 12. Since the connecting rod 54 is connected to the pilot valve core 3 by a hook, the pilot valve core 3 can be pulled out of the main valve core 2. After replacing the new pilot valve core 3, the pilot valve core 3 is pushed into the main valve core 2, and the limit plate 551 enters the cover annular groove 121 through the straight groove 122. The connecting pin 552 extends into the follower hole 24 again, and then overcomes the partition spring 72 to pull the partition 71 outward, so that the partition 71 withdraws from the positioning groove 26, and the main valve core 2 is released. The lock drives the transition block 55 to rotate 180 degrees, so that the limit plate 551 rotates along the cover annular groove 121, and at the same time drives the main valve core 2 to rotate, so that the main valve core 2 is reset, and then the partition plate 71 is released, and the partition plate spring 72 pushes the partition plate 71 into the fan-shaped groove 25. When the partition plate 71 passes over the lock plate 73, the lock plate 73 is driven to rotate by the torsion spring 74 to lock the partition plate 71. The present invention returns to the initial state, and the rapid replacement of the pilot valve core 3 is completed.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A two-stage proportional servo valve driven by a voice coil motor, characterized in that: The invention comprises a main body (1), a main valve core (2), a pilot valve core (3) and a partition (71); the main valve core (2) is rotatably connected in the main body (1), and a fan-shaped groove (25) and a positioning groove (26) are provided on the outer circumferential wall of the main valve core (2); the pilot valve core (3) is slidably arranged in the main valve core (2); the partition (71) is slidably arranged in the main body (1), and the partition (71) can extend into the fan-shaped groove (25) and the positioning groove (26); When the partition plate (71) extends into the fan-shaped groove (25), the partition plate (71) divides the fan-shaped groove (25) into a first control chamber (251) and a second control chamber (252), and the pilot valve core (3) reciprocates in the main valve core (2) to control the pressure of the oil in the first control chamber (251) and the second control chamber (252), thereby driving the main valve core (2) to reciprocate; When the partition plate (71) extends into the positioning groove (26), the main valve core (2) is fixed and cannot rotate, and the oil in the main body (1) cannot flow into the main valve core (2).

2. The two-stage proportional servo valve based on voice coil motor drive according to claim 1, characterized in that: The two-stage proportional servo valve based on voice coil motor drive also includes a transition block (55); The transition block (55) is rotatably connected to the main body (1); a cover annular groove (121) and a straight groove (122) are provided on the main body (1); one end of the straight groove (122) is connected to the cover annular groove (121), and the other end extends to the right end surface of the main body (1); a limit plate (551) is radially provided on the transition block (55); the limit plate (551) can slide in the cover annular groove (121) and the straight groove (122); a follower hole (24) is provided on the right end surface of the main valve core (2); a connecting pin (552) is provided on the left side of the transition block (55), and the connecting pin (552) extends into the follower hole (24).

3. The two-stage proportional servo valve driven by a voice coil motor according to claim 1, characterized in that: The two-stage proportional servo valve based on voice coil motor drive also includes a diaphragm spring (72), a lock plate (73) and a torsion spring (74); The partition spring (72) is arranged in the main body (1) to drive the partition (71) to slide in a direction close to the axis of the main valve core (2); The locking plate (73) is rotatably connected in the main body (1); The torsion spring (74) is arranged in the locking plate (73) to drive the locking plate (73) to rotate in a direction close to the partition plate (71).

4. The two-stage proportional servo valve based on voice coil motor drive according to claim 2, characterized in that: The two-stage proportional servo valve driven by a voice coil motor also includes a first spring seat (51), a second spring seat (52), a valve core spring (53) and a connecting rod (54); The connecting rod (54) is slidably connected in the transition block (55), and one end of the connecting rod (54) is detachably connected to the right end of the pilot valve core (3); The first spring seat (51) and the second spring seat (52) are sleeved on the connecting rod (54) facing each other; The valve core spring (53) is arranged between the first spring seat (51) and the second spring seat (52) to drive the first spring seat (51) and the second spring seat (52) to move in a direction away from each other.

5. A two-stage proportional servo valve based on voice coil motor drive according to claim 4, characterized in that: The two-stage proportional servo valve driven by a voice coil motor also includes a voice coil motor (6), wherein the voice coil motor (6) and the transition block (55) are fixedly connected, and the output shaft of the voice coil motor (6) and the right end of the connecting rod (54) are detachably connected.

6. The two-stage proportional servo valve based on voice coil motor drive according to claim 2, characterized in that: The main body (1) comprises a valve body (11) and a valve cover (12); The valve body (11) is provided with an A port, a B port, a P port and a T port; The valve cover (12) is fixedly connected to the right side of the valve body (11), and the cover annular groove (121) and the straight groove (122) are both located inside the valve cover (12).

7. The two-stage proportional servo valve based on voice coil motor drive according to claim 6, characterized in that: The outer circumferential wall of the main valve core (2) is provided with a first switching groove (231), a second switching groove (232) and a third switching groove (233); When the partition plate (71) extends into the fan-shaped groove (25), the first switching groove (231) is connected to the P port, and the second switching groove (232) and the third switching groove (233) are both connected to the T port, and the main valve core (2) can control the on-off relationship between the first switching groove (231), the second switching groove (232), the third switching groove (233) and the A port and the B port; When the partition plate (71) extends into the positioning groove (26), the first switching groove (231), the second switching groove (232), the third switching groove (233) and the P port, the T port, the A port and the B port are all blocked from communication.

8. The two-stage proportional servo valve driven by a voice coil motor according to claim 7, characterized in that: A valve core cavity is provided in the main valve core (2); the first switching groove (231), the third switching groove (233), the first control cavity (251) and the second control cavity (252) are all connected to the valve core cavity; the pilot valve core (3) reciprocates in the valve core cavity to control the on-off relationship between the first switching groove (231), the third switching groove (233) and the first control cavity (251), the second control cavity (252).

9. The two-stage proportional servo valve based on voice coil motor drive according to claim 7, characterized in that: The main valve core (2) is further provided with a first main flow channel (21) and a second main flow channel (22); The left end of the first main flow channel (21) is arc-shaped and extends to the left end surface of the main valve core (2), and the other end is connected to the first switching groove (231); the left end of the second main flow channel (22) is arc-shaped and extends to the left end surface of the main valve core (2), and the second switching groove (232) and the third switching groove (233) are both connected to the second main flow channel (22); When the main valve core (2) reciprocates, the first main flow channel (21) is communicated with the P port, and the second main flow channel (22) is communicated with the T port; When the main valve core (2) is fixed, the first main flow channel (21) and the second main flow channel (22) are disconnected from the P port and the T port.

10. The two-stage proportional servo valve based on voice coil motor drive according to claim 6, characterized in that: The two-stage proportional servo valve driven by a voice coil motor also includes an angle sensor (4), wherein the angle sensor (4) and the valve body (11) are fixedly connected, and the output shaft of the angle sensor (4) and the main valve core (2) are fixedly connected.

Images