A direct acting servo valve

Abstract

The invention discloses a direct-acting servo valve, which belongs to the field of hydraulic components and is mainly used in a servo hydraulic system. The valve valve mainly consists of a valve body, a valve core, a valve sleeve, a voice coil motor, a controller, a connecting mechanism, a control screw plugging mechanism and a centering mechanism, wherein the valve sleeve can be switched between a left position and a right position; the control screw plugging mechanism can be switched between a blocking state and an open state; the connecting mechanism is fixedly connected between the valve body and the voice coil motor; the centering mechanism can be switched between a locked state and a loosened state; when the control screw plugging mechanism is in a blocked state, the valve sleeve is in a right position, the centering mechanism is in a locked state, and at this time the centering mechanism and the valve core are fixedly connected; when the control screw plugging mechanism is in an open state, the valve sleeve is in a left position, the centering mechanism is in a loosened state, and at this time the centering mechanism and the valve core are disconnected; when the valve core, the voice coil motor and the controller are replaced by the invention, the operation steps are simple, and the invention does not need to be disassembled, so online replacement can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic components, and in particular relates to a direct-acting servo valve. Background Art

[0002] As industry develops towards automation, more and more hydraulic control systems are adopting servo systems. The core control component of hydraulic servo systems is the servo valve. The currently commonly used servo valve is both a signal conversion element and a power amplifier element, which can convert a very small input electrical signal into a large hydraulic power output signal. It has the characteristics of high sensitivity, fast dynamic response speed, large power-to-weight ratio, high control accuracy, and high load resistance. As a result, servo valves are widely used in many important fields. Direct-acting servo valves are a type of servo valve that are used in large quantities and frequently. However, due to the structural characteristics of direct-acting servo valves, the internal valve core must frequently move toward the valve sleeve, resulting in significant wear of the valve core, necessitating regular replacement of the valve core. At the same time, since the voice coil motor and controller of the direct-acting servo valve are constantly in operation, these mechanisms require regular maintenance. In the existing technology, the direct-acting servo valve needs to be removed from the system and disassembled before parts can be replaced. This process is labor-intensive and inefficient. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a direct-acting servo valve.

[0004] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a direct-acting servo valve, comprising a valve body, a valve core, a voice coil motor and a controller, wherein the voice coil motor is arranged on the right side of the valve body, and the controller is arranged above the voice coil motor to control the voice coil motor; this embodiment also includes: a valve sleeve, a connecting mechanism, a control screw plug mechanism and a centering mechanism; the valve sleeve is slidably arranged in the valve body, the valve core is slidably arranged in the valve sleeve, and the valve sleeve can be switched between a left position and a right position; the control screw plug mechanism is fixedly arranged on the left side of the valve body, and the control screw plug mechanism is fixedly arranged on the left side of the valve body. The mechanism can switch between a blocked state and an open state; the connecting mechanism is fixedly connected between the valve body and the voice coil motor; the centering mechanism is arranged in the connecting mechanism, and the centering mechanism can switch between a locked state and a loosened state; when the control screw plugging mechanism is in a blocked state, the valve sleeve is in a right position, and the centering mechanism is in a locked state, at which time the centering mechanism and the valve core are fixedly connected; when the control screw plugging mechanism is in an open state, the valve sleeve is in a left position, and the centering mechanism is in a loosened state, at which time the centering mechanism and the valve core are disconnected.

[0005] Preferably, the valve body is provided with port A, port B, port P, port T and port Y; a valve sleeve through hole is provided in the valve sleeve, and a plurality of communicating flow channels connected with the valve sleeve through hole are evenly distributed along the axial direction on the valve sleeve, and the plurality of communicating flow channels are used to connect the valve sleeve through hole with port A, port B, port P and port T; when the valve sleeve is in the right position, the plurality of communicating flow channels are connected with port A, port B, port P and port T; when the valve sleeve is in the left position, the plurality of communicating flow channels are blocked from port A, port B, port P and port T.

[0006] Preferably, a valve sleeve spiral groove is provided on the left side of the valve sleeve, a valve sleeve straight groove is provided axially on the left side of the valve sleeve, a valve sleeve radial groove is provided radially inside the valve sleeve; and a valve sleeve annular groove is provided on the right end of the valve core.

[0007] Preferably, the control screw plug mechanism includes: a screw plug, a control sleeve, a control cap, an arc-shaped slider, a control pin, a control cap pin, a screw plug positioning rod, a positioning spring and an axis pin; the screw plug is threadedly fixedly fitted on the left side of the valve body, and an arc groove is provided in the screw plug; the control sleeve is slidably arranged in the screw plug, and a control sleeve spiral groove is provided on the right side of the control sleeve, and the rotation directions of the control sleeve spiral groove and the valve sleeve spiral groove are opposite, a control sleeve straight groove is axially provided on the right side of the control sleeve, a control sleeve radial hole is radially provided on the right side of the control sleeve, and a control sleeve positioning hole is radially provided on the left side of the control sleeve; the control cap is slidably arranged in the control sleeve, and a control cap annular groove is provided on the right side of the control cap, and the control cap annular groove can be aligned with the control sleeve radial hole; the arc-shaped slider is slidably arranged in the arc-shaped groove; the control pin is radially fixed on the arc-shaped slider, and the control pin passes through the valve sleeve screw After the rotation groove, it extends into the spiral groove of the control sleeve; the control cap pin is slidably arranged in the radial hole of the control sleeve, and the two ends of the control cap pin are respectively provided with hemispherical surfaces. When one end of the control cap pin extends into the annular groove of the control cap, the other end of the control cap pin retracts into the radial hole of the control sleeve. When the other end of the control cap pin extends into the radial groove of the valve sleeve, one end of the control cap pin retracts into the radial hole of the control sleeve; the screw plug positioning rod is slidably arranged in the screw plug, and one end of the screw plug positioning rod is respectively provided with a first positioning column and a second positioning column along the axial direction, and the other end passes through the screw plug, and the first positioning column and the second positioning column can both extend into the positioning hole of the control sleeve; the positioning spring is arranged in the screw plug to drive the screw plug positioning rod to move toward the direction of the control sleeve; the axis pin is fixedly arranged in the screw plug along the radial direction, and the axis pin passes through the straight groove of the valve sleeve and then extends into the straight groove of the control sleeve.

[0008] Preferably, the connecting mechanism includes: a connecting block, a positioning ring and a positioning pin; the connecting block is fixedly arranged on the right side of the valve body, and the voice coil motor is fixedly connected to the right side of the connecting block; the positioning ring is fixedly arranged in the connecting block, and the outer circumferential wall of the positioning ring is radially provided with a positioning ring hole; the positioning pin is threadedly fixed in the connecting block, and the lower end of the positioning pin extends into the positioning ring hole.

[0009] Preferably, the centering mechanism includes: a centering shaft, a connecting shaft, a connecting hook, a connecting spring, a first spring seat, a second spring seat, a centering spring and a connecting nut; the centering shaft is slidably arranged in the connecting block, and the right end of the valve core is slidably connected to the centering shaft; the connecting shaft is slidably arranged in the connecting block, and the left side of the connecting shaft is slidably matched with the centering shaft, the left side of the connecting shaft is provided with a connecting shaft annular groove, and the right side of the connecting shaft is provided with a connecting external thread; the connecting hook is slidably arranged in the centering shaft, and a first connecting pin is provided at the lower left side of the connecting hook, and a second connecting pin is provided at the lower right side, the first connecting pin can be extended into the annular groove of the valve core, and the second connecting pin can be extended into the annular groove of the connecting shaft. , an inclined surface is provided on the upper left side of the connecting hook; the connecting spring is arranged in the centering shaft to drive the connecting hook to move in the direction away from the centering shaft; the first spring seat is slidably arranged in the connecting block, and the first spring seat is sleeved on the connecting shaft; the second spring seat is slidably arranged in the connecting block, the second spring seat is arranged between the first spring seat and the positioning ring, and the second spring seat is sleeved on the connecting shaft; the centering 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 in the direction away from each other; the connecting nut is arranged on the right side of the second spring seat, and the connecting nut is threadedly connected to the connecting external thread.

[0010] Preferably, when the first positioning post extends into the positioning hole of the control sleeve, the control screw plugging mechanism is in a blocked state; when the second positioning post extends into the positioning hole of the control sleeve, the control screw plugging mechanism is in an open state.

[0011] Preferably, when the first connecting pin extends into the valve core annular groove, the second connecting pin extends into the connecting shaft annular groove, and the inclined surface retracts into the centering shaft, the centering mechanism is in a locked state; when the first connecting pin withdraws from the valve core annular groove, the second connecting pin withdraws from the connecting shaft annular groove, and the inclined surface extends out of the centering shaft, the centering mechanism is in a released state.

[0012] Preferably, the right end of the connecting shaft is detachably connected to the output shaft of the voice coil motor.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. By arranging the valve sleeve and the valve body to cooperate, the control valve sleeve can be slid relative to the valve body, and the valve sleeve can be used to block the oil ports in the valve body. When the valve core is removed, the hydraulic oil in the oil ports will not flow out, realizing the purpose of online replacement and maintenance.

[0015] 2. By placing the centering mechanism between the valve core and the voice coil motor output shaft and adjusting the valve sleeve position, the connection between the centering mechanism and the valve core can be controlled. This allows the valve core to be removed without extensive disassembly, making valve core replacement more convenient and quick.

[0016] 3. By arranging the coordination between the control sleeve, valve sleeve and screw plug, pushing the control sleeve can drive the valve sleeve to move relative to the valve body. At the same time, when the control sleeve moves into place, the control cap inside the control sleeve will automatically separate from the control sleeve. After the control cap is removed, the valve core inside the valve sleeve can be exposed, thereby realizing rapid and online disassembly of the valve core.

[0017] 4. By setting the centering mechanism between the valve core and the voice coil motor output shaft and changing the position of the valve sleeve, the working state of the centering mechanism can be controlled. When the centering mechanism is switched to the loose state, the connecting rod in the centering mechanism is unlocked. Since the connecting rod and the voice coil motor output shaft are fixedly connected, the voice coil motor can be removed, making it possible to remove the voice coil motor without large-scale disassembly, making maintenance and replacement more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of the present invention;

[0019] Figure 2 For the present invention Figure 1 Enlarged view at point I in the middle;

[0020] Figure 3 For the present invention Figure 2 Cross-sectional view in the AA direction;

[0021] Figure 4 For the present invention Figure 1 Enlarged view of position II in the middle;

[0022] Figure 5 A partial three-dimensional view of the control sleeve of the present invention;

[0023] Figure 6 A partial three-dimensional view of the valve sleeve of the present invention;

[0024] Figure 7 A partial three-dimensional view of the screw plug of the present invention;

[0025] Figure 8A three-dimensional view of the arc-shaped slider and the control pin of the present invention;

[0026] Figure 9 A three-dimensional view of the connecting hook of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0028] Combine Figures 1-9 As shown, a direct-acting servo valve of this embodiment includes a valve body 1, a valve core 21, a voice coil motor 5 and a controller 6. The voice coil motor 5 is arranged on the right side of the valve body 1, and the controller 6 is arranged above the voice coil motor 5 to control the voice coil motor 5. This embodiment also includes: a valve sleeve 22, a connecting mechanism 4, a control screw plugging mechanism 3 and a centering mechanism 7. The valve sleeve 22 is slidably arranged in the valve body 1, and the valve core 21 is slidably arranged in the valve sleeve 22. The valve sleeve 22 can be switched between the left position and the right position; the control screw plugging mechanism 3 is fixedly arranged on the left side of the valve body 1, and the control screw plugging mechanism 3 is fixedly arranged on the left side of the valve body 1. The mechanism 3 can switch between a blocked state and an open state; the connecting mechanism 4 is fixedly connected between the valve body 1 and the voice coil motor 5; the centering mechanism 7 is arranged in the connecting mechanism 4, and the centering mechanism 7 can switch between a locked state and a loosened state; when the control screw plugging mechanism 3 is in a blocked state, the valve sleeve 22 is in the right position, and the centering mechanism 7 is in a locked state, at which time the centering mechanism 7 and the valve core 21 are fixedly connected; when the control screw plugging mechanism 3 is in an open state, the valve sleeve 22 is in the left position, and the centering mechanism 7 is in a loosened state, at which time the centering mechanism 7 and the valve core 21 are disconnected.

[0029] Combine Figure 1 As shown, in this embodiment, the valve body 1 is provided with port A, port B, port P, port T and port Y; a valve sleeve through hole is provided in the valve sleeve 22, and a plurality of communicating flow channels 224 connected to the valve sleeve through hole are evenly distributed along the axial direction on the valve sleeve 22, and the plurality of communicating flow channels 224 are used to connect the valve sleeve through hole with port A, port B, port P and port T; when the valve sleeve 22 is in the right position, the plurality of communicating flow channels 224 are connected with port A, port B, port P and port T; when the valve sleeve 22 is in the left position, the plurality of communicating flow channels 224 are blocked from port A, port B, port P and port T.

[0030] Combine Figure 1 、 Figure 6 As shown, in this embodiment, a valve sleeve spiral groove 221 is provided on the left side of the valve sleeve 22, a valve sleeve straight groove 222 is provided axially on the left side of the valve sleeve 22, and a valve sleeve radial groove 223 is provided radially inside the valve sleeve 22; a valve sleeve annular groove 211 is provided at the right end of the valve core 21.

[0031] At this time, by setting the valve sleeve 22 and the valve body 1 together, after the control valve sleeve 22 slides relative to the valve body 1, the various oil ports in the valve body 1 can be sealed through the valve sleeve 22, so that when the valve core 21 is removed in the present invention, the hydraulic oil in the various oil ports will not flow out, thereby realizing the purpose of online replacement and maintenance.

[0032] Combine Figures 1-8 As shown, in this embodiment, the control screw plug mechanism 3 includes: a screw plug 31, a control sleeve 32, a control cap 33, an arc-shaped slider 34, a control pin 35, a control cap pin 36, a screw plug positioning rod 37, a positioning spring 38 and an axis pin 39; the screw plug 31 is threadedly fixedly fitted on the left side of the valve body 1, and an arc groove 311 is provided in the screw plug 31; the control sleeve 32 is slidably set in the screw plug 31, and a control sleeve spiral groove 321 is provided on the right side of the control sleeve 32, and the control sleeve spiral groove 321 and the valve sleeve spiral groove 221 rotate in opposite directions. The right side of the control sleeve 32 is provided with a control sleeve straight groove 322 along the axial direction, the right side of the control sleeve 32 is provided with a control sleeve radial hole 323 along the radial direction, and the left side of the control sleeve 32 is provided with a control sleeve positioning hole 324 along the radial direction; the control cap 33 is slidably arranged in the control sleeve 32, and the right side of the control cap 33 is provided with a control cap annular groove 331, and the control cap annular groove 331 can be aligned with the control sleeve radial hole 323; the arc slider 34 is slidably arranged in the arc groove 311; the control pin 35 is fixedly arranged on the arc slider 34 along the radial direction, and the control The pin 35 passes through the spiral groove 221 of the valve sleeve and extends into the spiral groove 321 of the control sleeve; the control cap pin 36 is slidably set in the radial hole 323 of the control sleeve, and the two ends of the control cap pin 36 are respectively provided with a hemispherical surface. When one end of the control cap pin 36 extends into the annular groove 331 of the control cap, the other end of the control cap pin 36 retracts into the radial hole 323 of the control sleeve. When the other end of the control cap pin 36 extends into the radial groove 223 of the valve sleeve, one end of the control cap pin 36 retracts into the radial hole 323 of the control sleeve; the screw plug positioning rod 37 is slidably set In the screw plug 31, one end of the screw plug positioning rod 37 is axially provided with a first positioning column 371 and a second positioning column 372, and the other end passes through the screw plug 31. The first positioning column 371 and the second positioning column 372 can both be extended into the control sleeve positioning hole 324; a positioning spring 38 is arranged in the screw plug 31 to drive the screw plug positioning rod 37 to move toward the control sleeve 32; an axis pin 39 is fixedly arranged in the screw plug 31 along the radial direction, and the axis pin 39 passes through the valve sleeve straight groove 222 and extends into the control sleeve straight groove 322.

[0033] At this time, by means of the cooperation between the control sleeve 32, the valve sleeve 22 and the screw plug 31, the control sleeve 32 can be pushed to drive the valve sleeve 22 to move relative to the valve body 1. At the same time, when the control sleeve 32 moves into place, the control cap 33 in the control sleeve 32 will automatically separate from the control sleeve 32. After the control cap 33 is removed, the valve core 21 in the valve sleeve 22 can be exposed, thereby realizing rapid and online disassembly of the valve core 21.

[0034] Combine Figure 1As shown, in this embodiment, the connecting mechanism 4 includes: a connecting block 41, a positioning ring 42 and a positioning pin 43; the connecting block 41 is fixedly arranged on the right side of the valve body 1, and the voice coil motor 5 is fixedly connected to the right side of the connecting block 41; the positioning ring 42 is fixedly arranged in the connecting block 41, and the outer circumferential wall of the positioning ring 42 is radially provided with a positioning ring hole; the positioning pin 43 is threadedly fixed in the connecting block 41, and the lower end of the positioning pin 43 extends into the positioning ring hole.

[0035] Combine Figure 1 、 Figure 4 、 Figure 9 As shown, in this embodiment, the centering mechanism 7 includes: a centering shaft 71, a connecting shaft 72, a connecting hook 73, a connecting spring 74, a first spring seat 751, a second spring seat 752, a centering spring 76 and a connecting nut 77; the centering shaft 71 is slidably arranged in the connecting block 41, and the right end of the valve core 21 is slidably connected to the centering shaft 71; the connecting shaft 72 is slidably arranged in the connecting block 41, and the left side of the connecting shaft 72 is slidably matched with the centering shaft 71, the left side of the connecting shaft 72 is provided with a connecting shaft annular groove 721, and the right side of the connecting shaft 72 is provided with a connecting external thread; the connecting hook 73 is slidably arranged in the centering shaft 71, and a first connecting pin 731 is provided at the lower left side of the connecting hook 73, and a second connecting pin 732 is provided at the lower right side. The first connecting pin 731 can be extended into the valve core annular groove 211, and the second connecting pin 732 can be extended into the connecting hook In the annular groove 721 of the connecting shaft, an inclined surface 733 is provided on the upper left of the connecting hook 73; the connecting spring 74 is arranged in the centering shaft 71 to drive the connecting hook 73 to move away from the centering shaft 71; the first spring seat 751 is slidably arranged in the connecting block 41, and the first spring seat 751 is sleeved on the connecting shaft 72; the second spring seat 752 is slidably arranged in the connecting block 41, and the second spring seat 752 is arranged between the first spring seat 751 and the positioning ring 42, and the second spring seat 752 is sleeved on the connecting shaft 72; the centering spring 76 is arranged between the first spring seat 751 and the second spring seat 752 to drive the first spring seat 751 and the second spring seat 752 to move away from each other; the connecting nut 77 is arranged on the right side of the second spring seat 752, and the connecting nut 77 is threadedly connected to the connecting external thread.

[0036] At this time, by setting the centering mechanism 7 between the valve core 21 and the output shaft of the voice coil motor 5, and by changing the position of the valve sleeve 22, the connection state of the centering mechanism 7 and the valve core 21 can be controlled, and then the valve core 21 can be removed without large-scale disassembly of the present invention, making the replacement of the valve core 21 more convenient and quick.

[0037] Combine Figure 1 、 Figure 4 、 Figure 9As shown, in this embodiment, when the first positioning column 371 extends into the control sleeve positioning hole 324, the control screw plugging mechanism 3 is in a blocked state; when the second positioning column 372 extends into the control sleeve positioning hole 324, the control screw plugging mechanism 3 is in an open state.

[0038] Combine Figure 1 、 Figure 4 、 Figure 9 As shown, in this embodiment, when the first connecting pin 731 extends into the valve core annular groove 211, the second connecting pin 732 extends into the connecting shaft annular groove 721, and the inclined surface 733 retracts into the centering shaft 71, the centering mechanism 7 is in a locked state; when the first connecting pin 731 withdraws from the valve core annular groove 211, the second connecting pin 732 withdraws from the connecting shaft annular groove 721, and the inclined surface 733 extends out of the centering shaft 71, the centering mechanism 7 is in a released state.

[0039] Combine Figure 1 As shown, in this embodiment, the right end of the connecting shaft 72 is detachably connected to the output shaft of the voice coil motor 5 .

[0040] At this time, by setting the centering mechanism 7 between the valve core 21 and the output shaft of the voice coil motor 5, and by changing the position of the valve sleeve 22, the working state of the centering mechanism 7 can be controlled. When the centering mechanism 7 is switched to the loose state, the connecting rod 72 in the centering mechanism 7 is unlocked. Since the connecting rod 72 and the output shaft of the voice coil motor 5 are fixedly connected, the voice coil motor 5 can be disassembled, so that the voice coil motor can be disassembled without large-scale disassembly, making maintenance and replacement more convenient and quick.

[0041] The working principle of the present invention is as follows: Figure 1The above is the initial state of the present invention, at this time, the control screw plug mechanism 3 is in the blocking state, the valve sleeve 22 is in the right position, the centering mechanism 7 is in the locking state, the first connecting pin 731 extends into the valve core annular groove 211, the second connecting pin 732 extends into the connecting shaft annular groove 721, the inclined surface 733 presses on the inner wall of the valve sleeve through hole, the connecting rod 72, the centering shaft 71 and the valve core 21 are fixedly connected; when it is necessary to use the present invention, it is necessary to install the present invention in the system circuit, and then introduce pressure oil into the P port. Since the controller 6 has no electrical signal input at this time, the valve core 21 is in the middle valve position, and then the present invention realizes the middle position skill of the valve core 21; when the controller 6 is input The electrical signal causes the controller 6 to control the voice coil motor 5 to work, thereby controlling the left and right movement of the output shaft of the voice coil motor 5, thereby driving the valve core 21 to overcome the centering spring 76 and move left and right. When the valve core 21 reaches the right valve position, the pressure oil at the P port enters the present invention and flows out from the B port, while the pressure oil flowing in from the A port flows out through the T port. When the valve core 21 reaches the left valve position, the pressure oil at the P port enters the present invention and flows out from the A port, while the pressure oil flowing in from the B port flows out through the T port. The size of the electrical signal input to the controller 6 can control the telescopic length of the output shaft 51, thereby realizing the control of the displacement distance of the valve core 21, thereby achieving the normal working requirements of the present invention.

[0042] When the present invention is used for a long time and the valve core 21 or the controller 6 and the voice coil motor 5 of the present invention need to be replaced, first, the controller 6 needs to be powered off, and under the action of the centering spring 76, the valve core 21 is in the middle valve position, and then the positioning spring 38 is overcome to pull the screw plug positioning rod 37 upward, so that the first positioning column 371 exits the control sleeve positioning hole 324, and pushes the control sleeve 32 to the right. Since the axis pin 39 slides in the control sleeve straight groove 322 and the valve sleeve straight groove 222, and the control pin 35 slides in the control sleeve spiral groove 321 and the valve sleeve spiral groove 221, the control pin 35 is fixedly connected to the arc-shaped slider 34, and the arc-shaped slider 34 slides in the arc-shaped groove 311. When the control sleeve 32 moves to the right, the second positioning column 371 is When 72 and the control sleeve positioning hole 324 are aligned, the arc-shaped slider 34 slides along the arc-shaped groove 311, driving the valve sleeve 22 to move to the left position, so that the valve sleeve 22 blocks the A port, B port, P port and T port, loosening the screw plug positioning rod 37. Under the action of the positioning spring 38, the second positioning column 372 enters the control sleeve positioning hole 324 to position the control sleeve 32. At this time, the inclined surface 733 exits the valve sleeve 22, and the connecting hook 73 is pushed to move under the action of the connecting spring 74, so that the first connecting pin 731 exits the valve core annular groove 211, and the second connecting pin 732 exits the connecting shaft annular groove 721, so that the centering shaft 71 is separated from the valve core 21 and the connecting rod 72. The control screw plug mechanism 3 is switched to the open state, and the centering mechanism 7 is switched to the loose state. At this time, the control on the control sleeve 32 The radial hole 323 of the sleeve is aligned with the radial groove 223 of the valve sleeve, and the control cap 33 is pulled outward. The control cap pin 36 can be pushed into the radial groove 223 of the valve sleeve through the annular groove 331 of the control cap. The control cap 33 is unlocked and can be pulled out. Then the valve core 21 can be taken out and the valve core 21 can be replaced so that the right end of the new valve core 2 is completely extended into the centering shaft 71, and the control cap 33 is inserted into the control sleeve 32. If it is necessary to replace the controller 6 and the voice coil motor 5, the fixed connection between the voice coil motor 5 and the connecting block 4 can be released so that the connecting rod 72 is pulled out along with the output shaft of the voice coil motor 5. Since the connecting rod 72 and the output shaft of the voice coil motor 5 are fixedly connected by screws, the disassembly and reconnection process is simple. After the connecting rod 72 is connected to the new voice coil motor 5, The connecting rod 72 is re-inserted into the connecting block 41 so that the connecting nut 77 and the second spring seat 752 are tightly attached, and the connecting rod 72 is completely inserted into the centering shaft 71. Then the voice coil motor 5 and the connecting block 41 are fixedly connected. Then, the positioning spring 38 is overcome to pull the screw plug positioning rod 37 upward, so that the second positioning column 372 exits the control sleeve positioning hole 324, and the control sleeve 32 is pulled outward, driving the arc-shaped slider 34 to slide in the opposite direction along the arc groove 311, thereby driving the valve sleeve 22 to move to the right. When the first positioning column 371 and the control sleeve positioning hole 324 are aligned, the valve sleeve 22 moves to the right position. The screw plug positioning rod 37 is loosened, and the first positioning column 371 is pushed into the control sleeve positioning hole 324 under the action of the positioning spring 38. As the valve sleeve 22 moves to the right position,The valve sleeve 22 pushes the connecting hook 73 through the inclined surface 733 to overcome the connecting spring 74 and move downward, so that the first connecting pin 731 enters the valve core annular groove 211 and the second connecting pin 732 enters the connecting shaft annular groove 721, so that the centering shaft 71 is connected to the valve core 21 and the connecting rod 72. The centering mechanism 7 switches to the locked state, and the valve sleeve 22 opens the A port, B port, P port and T port. At the same time, due to the staggered control sleeve radial hole 323 and the valve sleeve radial groove 223, the control cap pin 36 enters the control cap annular groove 331, so that the control cap 33 and the control sleeve 32 are fixedly connected. The control screw plugging mechanism 3 switches to the blocked state. At this time, the present invention is in the initial state, and maintenance and replacement are completed without disassembling the present invention, realizing online maintenance.

[0043] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A direct-acting servo valve, comprising a valve body (1), a valve core (21), a voice coil motor (5) and a controller (6), wherein the voice coil motor (5) is arranged on the right side of the valve body (1), and the controller (6) is arranged above the voice coil motor (5) for controlling the voice coil motor (5); It is characterized in that Also includes: A valve sleeve (22), a connecting mechanism (4), a control screw plugging mechanism (3) and a centering mechanism (7); The valve sleeve (22) is slidably disposed in the valve body (1), the valve core (21) is slidably disposed in the valve sleeve (22), and the valve sleeve (22) can be switched between a left position and a right position; The control screw plugging mechanism (3) is fixedly arranged on the left side of the valve body (1), and the control screw plugging mechanism (3) can be switched between a blocking state and an open state; The connecting mechanism (4) is fixedly connected between the valve body (1) and the voice coil motor (5); The centering mechanism (7) is arranged in the connecting mechanism (4), and the centering mechanism (7) can be switched between a locked state and a released state; When the control screw plugging mechanism (3) is in a blocked state, the valve sleeve (22) is in the right position, and the centering mechanism (7) is in a locked state. At this time, the centering mechanism (7) and the valve core (21) are fixedly connected; When the control screw plug mechanism (3) is in an open state, the valve sleeve (22) is in a left position, the centering mechanism (7) is in a loosened state, and the centering mechanism (7) and the valve core (21) are disconnected; The valve body (1) is provided with an A port, a B port, a P port, a T port and a Y port; a valve sleeve through hole is provided in the valve sleeve (22); a plurality of communication channels (224) connected to the valve sleeve through hole are evenly distributed along the axial direction on the valve sleeve (22); the plurality of communication channels (224) are used to connect the valve sleeve through hole with the A port, the B port, the P port and the T port; when the valve sleeve (22) is in the right position, the plurality of communication channels (224) are connected with the A port, the B port, the P port and the T port; when the valve sleeve (22) is in the left position, the plurality of communication channels (224) are blocked from connecting with the A port, the B port, the P port and the T port; A valve sleeve spiral groove (221) is provided on the left side of the valve sleeve (22), a valve sleeve straight groove (222) is provided on the left side of the valve sleeve (22) along the axial direction, and a valve sleeve radial groove (223) is provided in the radial direction inside the valve sleeve (22); a valve core annular groove (211) is provided on the right end of the valve core (21); The control screw plug mechanism (3) comprises: a screw plug (31), a control sleeve (32), a control cap (33), an arc-shaped slider (34), a control pin (35), a control cap pin (36), a screw plug positioning rod (37), a positioning spring (38) and an axis pin (39); the screw plug (31) is threadedly fixedly engaged on the left side of the valve body (1), and an arc-shaped groove (311) is provided in the screw plug (31); the control sleeve (32) is slidably arranged in the screw plug (31), a control sleeve spiral groove (321) is provided on the right side of the control sleeve (32), the control sleeve spiral groove (321) and the valve sleeve spiral groove (221) have opposite rotation directions, a control sleeve straight groove (322) is provided on the right side of the control sleeve (32) along the axial direction, a control sleeve radial hole (323) is provided on the right side of the control sleeve (32) along the radial direction, and a control sleeve positioning hole (324) is provided on the left side of the control sleeve (32) along the radial direction; The control cap (33) is slidably disposed in the control sleeve (32). A control cap annular groove (331) is provided on the right side of the control cap (33). The control cap annular groove (331) can be aligned with the radial hole (323) of the control sleeve. The arc-shaped slider (34) is slidably disposed in the arc-shaped groove (311). The control pin (35) is fixedly disposed on the arc-shaped slider (34) in the radial direction. The control pin (35) passes through the spiral groove (221) of the valve sleeve and then extends into the spiral groove (321) of the control sleeve. The control cap pin (36) is slidably disposed in the radial hole (323) of the control sleeve. Both ends of the control cap pin (36) are respectively provided with hemispherical surfaces. When one end of the control cap pin (36) extends into the control cap annular groove (331), the other end of the control cap pin (36) retracts into the radial hole (323) of the control sleeve. When the control cap pin (36) is in the radial direction, the control cap pin (36) is in the radial direction. When the other end of the cap pin (36) extends into the radial groove (223) of the valve sleeve, one end of the control cap pin (36) retracts into the radial hole (323) of the control sleeve; the screw plug positioning rod (37) is slidably arranged in the screw plug (31); one end of the screw plug positioning rod (37) is provided with a first positioning column (371) and a second positioning column (372) in the axial direction, and the other end passes through the screw plug (31); the first positioning column (371) and the second positioning column (372) can both extend into the positioning hole (324) of the control sleeve; the positioning spring (38) is arranged in the screw plug (31) to drive the screw plug positioning rod (37) to move toward the control sleeve (32); the axis pin (39) is fixedly arranged in the screw plug (31) in the radial direction; the axis pin (39) passes through the valve sleeve straight groove (222) and then extends into the control sleeve straight groove (322); The connection mechanism (4) comprises: a connection block (41), a positioning ring (42) and a positioning pin (43); the connection block (41) is fixedly arranged on the right side of the valve body (1), and the voice coil motor (5) is fixedly connected to the right side of the connection block (41); the positioning ring (42) is fixedly arranged in the connection block (41), and a positioning ring hole is radially provided on the outer circumferential wall of the positioning ring (42); the positioning pin (43) is threadedly fixedly arranged in the connection block (41), and the lower end of the positioning pin (43) extends into the positioning ring hole; The centering mechanism (7) comprises: a centering shaft (71), a connecting shaft (72), a connecting hook (73), a connecting spring (74), a first spring seat (751), a second spring seat (752), a centering spring (76) and a connecting nut (77); The centering shaft (71) is slidably arranged in the connecting block (41), and the right end of the valve core (21) is slidably connected to the centering shaft (71); the connecting shaft (72) is slidably arranged in the connecting block (41), and the left side of the connecting shaft (72) is slidably matched with the centering shaft (71), the left side of the connecting shaft (72) is provided with a connecting shaft annular groove (721), and the right side of the connecting shaft (72) is provided with a connecting external thread; the connecting hook (73) is slidably arranged in the centering shaft (71), a first connecting pin (731) is provided at the lower left side of the connecting hook (73), and a second connecting pin (732) is provided at the lower right side, the first connecting pin (731) can extend into the valve core annular groove (211), and the second connecting pin (732) can extend into the connecting shaft annular groove (721), and the upper left side of the connecting hook (73) is provided with an inclined surface (733); the connecting spring (74) is arranged at the centering shaft (71), and the connecting hook (73) is provided with a first connecting pin (731) at the lower left side, and a second connecting pin (732) at the lower right side, the first connecting pin (731) can extend into the valve core annular groove (211), and the second connecting pin (732) can extend into the connecting shaft annular groove (721), and the upper left side of the connecting hook (73) is provided with an inclined surface (733); The first spring seat (751) is slidably disposed in the connecting block (41), and the first spring seat (751) is sleeved on the connecting shaft (72); the second spring seat (752) is slidably disposed in the connecting block (41), and the second spring seat (752) is disposed between the first spring seat (751) and the positioning ring (42), and the second spring seat (752) is sleeved on the connecting shaft (72); the centering spring (76) is disposed between the first spring seat (751) and the second spring seat (752), and is used to drive the first spring seat (751) and the second spring seat (752) to move in a direction away from each other; the connecting nut (77) is disposed on the right side of the second spring seat (752), and the connecting nut (77) is threadedly connected to the connecting external thread; When the first positioning column (371) extends into the control sleeve positioning hole (324), the control screw plugging mechanism (3) is in a blocked state; when the second positioning column (372) extends into the control sleeve positioning hole (324), the control screw plugging mechanism (3) is in an open state; When the first connecting pin (731) extends into the valve core annular groove (211), the second connecting pin (732) extends into the connecting shaft annular groove (721), and the inclined surface (733) retracts into the centering shaft (71), the centering mechanism (7) is in a locked state; when the first connecting pin (731) withdraws from the valve core annular groove (211), the second connecting pin (732) withdraws from the connecting shaft annular groove (721), and the inclined surface (733) extends out of the centering shaft (71), the centering mechanism (7) is in a released state.

2. A direct-acting servo valve according to claim 1, Features: The right end of the connecting shaft (72) is detachably connected to the output shaft of the voice coil motor (5).

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