A voice coil motor for servo valve

Abstract

The invention discloses a voice coil motor for a servo valve, which belongs to the field of electrical components and is mainly used in servo valves. The voice coil motor mainly consists of a shell, a permanent magnet ring, a transition body, an end cover, an output shaft, a coil mechanism, a control rotary sleeve, a sealing plate, a temporary sealing mechanism, and a limiting mechanism, wherein the sealing plate is used for storing an O-ring; the output shaft cooperates with the coil mechanism, and when the coil mechanism moves, the output shaft can drive the servo valve core to follow the movement to achieve control of the servo valve; the temporary sealing mechanism is used for cooperating with the output shaft to form a seal when the O-ring is replaced; the control rotary sleeve is used for controlling the matching relationship between the coil mechanism and the output shaft, and can control the state of the temporary sealing mechanism; the limiting mechanism is used for limiting the sealing plate, so that the right side of the sealing plate is tightly attached to the transition body; when the O-ring on the sealing plate is replaced, the steps are simple, the operation is convenient, and no disassembly is required, so that online replacement can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical components, and in particular relates to a voice coil motor for a servo valve. Background Art

[0002] The voice coil motor is a special form of direct drive motor with the characteristics of simple structure, small size, fast response, good thrust linearity, etc. It is very suitable for small-range high-speed linear motion. Its working principle is that when an energized coil (conductor) is placed in a magnetic field, a force will be generated, and the magnitude of the force is proportional to the current applied to the coil. Due to the working characteristics of the voice coil motor, its use in servo valves is increasing; when the voice coil motor is installed on the servo valve, its output shaft needs to be fixedly connected to the servo valve core, and then control the movement of the servo valve core to achieve the control of the servo valve; in order to prevent the hydraulic oil in the servo valve from entering the voice coil motor, an O-ring needs to be set between the output shaft of the voice coil motor and the housing. However, since the servo valve needs to frequently control the valve core when it is working, the output shaft wears the O-ring more. Therefore, in the prior art, the servo valve needs to be disassembled regularly and the O-ring needs to be replaced. This process not only consumes a lot of manpower and time, but also disassembling the servo valve will affect the normal use of the equipment where it is located. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a voice coil motor for a servo valve.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a voice coil motor for a servo valve, comprising a shell and a permanent magnet ring, wherein a shell blind hole is coaxially provided in the shell, a shell through hole is coaxially penetrated in the shell, and the permanent magnet ring is coaxially fixed in the shell blind hole; the present invention also includes a transition body, an end cover, an output shaft, a coil mechanism, a control rotary sleeve, a sealing plate, a temporary sealing mechanism, and a limiting mechanism; a first square hole is provided at the upper right side of the shell, a second square hole is provided at the lower right side of the shell, a first disassembly groove and a second disassembly groove are provided on the right side of the shell, and a first shell groove and a second shell groove are provided on the left end face of the shell; the transition body is fixedly provided on the right side of the shell, and a coaxial shell through hole is provided in the transition body from right to left along the axial direction. A first transition blind hole and a second transition blind hole, a shoulder is provided between the first transition blind hole and the second transition blind hole, a transition shaft hole is coaxially penetrated in the transition body, a transition guide hole is eccentrically penetrated in the transition body along the axial direction, a first slide rod hole is provided below the transition body, and a second slide rod hole is provided above the transition body; the end cover is fixedly arranged on the right side of the transition body to block the first transition blind hole, an end cover shaft hole is coaxially penetrated in the end cover, an end cover pin is radially fixedly provided in the end cover shaft hole, and an end cover blind hole is coaxially provided on the left side of the end cover; the sealing plate is slidably arranged in the housing, a sealing shaft hole is coaxially penetrated in the sealing plate, a sealing groove is provided on the right side of the sealing plate, and an O-ring is provided in the sealing groove; The output shaft is slidably arranged in the sealing shaft hole, the transition shaft hole and the end cover shaft hole, the right end of the output shaft extends out of the end cover, and the left end of the output shaft extends out of the sealing plate; the coil mechanism is slidably arranged in the blind hole of the shell, the right side of the coil mechanism is connected with the output shaft, and the coil mechanism can drive the output shaft to slide in the left and right directions; the temporary sealing mechanism is slidably arranged in the first transition blind hole and the second transition blind hole, and the temporary sealing mechanism is sleeved on the outside of the output shaft; the control rotary sleeve is rotatably arranged on the left side of the shell to control the connection state of the coil mechanism and the output shaft; the limiting mechanism is slidably arranged in the first square hole and the second square hole to limit the sealing plate, so that the right side of the sealing plate is tightly attached to the transition body.

[0005] Preferably, an output shaft groove is provided on the outer circumferential wall on the right side of the output shaft, and the end cover pin is slidably arranged in the output shaft groove; a pillow block is coaxially provided on the output shaft, and the pillow block is arranged on the left side of the output shaft groove, the thickness of the pillow block is the same as the depth of the end cover blind hole, the diameter of the pillow block is smaller than the diameter of the end cover blind hole, and an axle pin is radially provided on the left end of the output shaft.

[0006] Preferably, the coil mechanism comprises: a coil frame, a coil, a rotating cap and a rotating pin; the coil frame is slidably arranged in the blind hole of the shell, the coil frame is coaxially provided with a frame blind hole along the axial direction, the coil frame is coaxially penetrated with a frame shaft hole, the coil frame is eccentrically penetrated with a frame guide hole along the axial direction, and the frame guide hole is coaxial with the transition guide hole; the coil is fixedly sleeved on the outside of the coil frame, and the permanent magnet ring is sleeved on the outside of the coil; the rotating cap is rotatably connected to the coil frame, the rotating cap is coaxially provided with a rotating hole along the axial direction on the right side, the rotating hole is coaxial and connected with the frame shaft hole, the rotating hole is provided with a rotating ring groove on the left side, the inner wall of the rotating hole is axially provided with a connecting groove, and the left side of the connecting groove is connected with the rotating ring groove; when the shaft pin is placed in the rotating ring groove, the rotating cap is coaxial with the output shaft and cannot move axially relative to it; when the shaft pin and the connecting groove are aligned, the shaft pin can slide along the connecting groove, so that the rotating cap can slide axially relative to the output shaft; the rotating cap is fixedly provided with a rotating pin on the left side in the radial direction.

[0007] Preferably, a first sealing slide rod is axially provided at the lower right side of the sealing plate, the first sealing slide rod is slidably set in the first slide rod hole, and a slide rod spring hole is coaxially provided in the first sealing slide rod; a second sealing slide rod is axially provided at the upper right side of the sealing plate, the second sealing slide rod is slidably set in the second slide rod hole; a sealing guide hole is eccentrically penetrated by the sealing plate along the axial direction, and the sealing guide hole is coaxial with the transition guide hole and has the same diameter as the transition guide hole.

[0008] Preferably, the temporary sealing mechanism comprises: a control piston, a control ring, an annular sealing bag and a control spring; the control piston is slidingly arranged in the first transition blind hole and the second transition blind hole, the right side of the control piston is coaxially provided with a piston blind hole, the control piston is coaxially penetrated with a piston shaft hole, the output shaft passes through the piston shaft hole, the control piston is eccentrically provided with a piston spring blind hole along the axial direction, the control piston is eccentrically penetrated with a piston slide rod hole, the piston slide rod hole and the piston spring blind hole are coaxial, the left side of the control piston is eccentrically provided with a piston push rod along the axial direction, the left end of the piston push rod passes through the transition guide hole, the sealing guide hole and the frame guide hole and is placed in the frame blind hole; the control ring is slidingly arranged in the first transition blind hole, the shoulder prevents the control ring from entering the second transition blind hole, the outer ring of the control ring is provided with a first sealing member, and a seal can be formed between the outer ring of the control ring and the first transition blind hole through the first sealing member, the control ring is coaxially penetrated with a ring shaft hole, the output shaft passes through the ring shaft hole The cam is provided with a plurality of cams, each of which ...

[0009] Preferably, a rotary sleeve hole is coaxially penetrated in the control rotary sleeve, a rotary sleeve groove is axially opened on the right inner wall of the rotary sleeve hole, the rotating pin is slidably arranged in the rotary sleeve groove, and a telescopic groove is also provided on the right inner wall of the rotary sleeve hole, a first spiral surface and a second spiral surface are symmetrically arranged on both sides of the telescopic groove, a bottom plane is arranged at the bottom end of the telescopic groove, the lower part of the first spiral surface and the lower part of the second spiral surface are respectively connected to the two sides of the bottom plane, and the piston push rod is slidably arranged in the telescopic groove.

[0010] Preferably, the limit mechanism comprises: a limit rod and a limit spring; two limit rods are provided, which are slidably arranged in the first square hole and the second square hole respectively; one end of the limit rod is a square rod, and the square rod slides with the first square hole or the second square hole to control the limit rod from rotating relative to the outer shell; the other end of the limit rod is provided with a limit platform to limit the limit rod from moving toward the middle; one end of the limit rod is also provided with a limit slope, and the limit slope can cooperate with the sealing plate, so that the sealing plate can push the limit rod to move away from the axis of the outer shell when it moves to the right; the limit spring is sleeved on the limit rod to drive the limit rod to move toward the axis of the outer shell.

[0011] Preferably, the control rotary sleeve is provided with a countersunk hole, a steel ball and a positioning spring are arranged in the countersunk hole, and the positioning spring drives the steel ball to move in a direction away from the countersunk hole.

[0012] Preferably, when the steel ball is located in the first shell groove, the rotating cap and the output shaft cannot move axially relative to each other, and the piston push rod is placed in the telescopic groove. When the steel ball is located in the first shell groove, the rotating cap and the output shaft can move axially relative to each other, and the piston push rod exits the telescopic groove.

[0013] Preferably, a push spring is further included, wherein the push spring is arranged in the spring hole of the slide rod and is used for pushing the sealing plate away from the transition body.

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

[0015] 1. By setting a sealing plate and installing the O-ring on the sealing plate, the O-ring and the output shaft are sealed through the cooperation between the sealing plate and the transition body, and the hydraulic oil in the servo valve can be blocked outside the voice coil motor. When the O-ring needs to be replaced, the sealing plate and the transition body can be separated by pushing the spring, thereby realizing the quick removal of the O-ring, which is convenient and quick;

[0016] 2. By arranging an annular sealing bag in the transition body, due to the cooperation between the annular sealing bag and the control piston, when the annular sealing bag is squeezed, the annular sealing bag can expand toward the middle, and then cooperate with the output shaft to form a seal, so that when the O-ring on the sealing plate is replaced, the annular sealing bag can form a seal in front of the O-ring, ensuring that the hydraulic oil inside the servo valve will not flow out during replacement, and will not cause pollution;

[0017] 3. By setting a rotating cap on the coil frame, the output shaft and the coil frame can be quickly matched through the cooperation of the rotating cap and the output shaft. When the O-ring needs to be replaced, the rotating cap can be rotated to quickly separate the output shaft and the coil frame, so that the O-ring can be quickly removed from the output shaft, thereby realizing the rapid replacement of the O-ring and saving replacement time;

[0018] 4. A control rotary sleeve is rotatably arranged at the rear of the housing, and a telescopic groove with a first spiral surface and a second spiral surface is arranged on the control rotary sleeve. When the control rotary sleeve is rotated, the telescopic groove cooperates with the piston push rod on the control piston, thereby pushing the control piston to move. When the control piston moves into place, the control piston cooperates with the control ring, which can not only position the output shaft, but also squeeze the annular sealing bag to form a seal. At the same time, since the control rotary sleeve can drive the rotation of the rotating cap, the coil frame and the output shaft can be controlled to be quickly separated, thereby reducing the steps for replacing the O-ring, which is convenient and quick. In addition, the O-ring does not need to be disassembled to replace the present invention, so it can be replaced online. 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 It is a partial three-dimensional view of the control sleeve of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings.

[0025] Combination Figure 1-Figure 5As shown, the voice coil motor for the servo valve of this embodiment includes a shell 11 and a permanent magnet ring 4. A shell blind hole is coaxially provided in the shell 11, and a shell through hole is coaxially penetrated in the shell 11. The permanent magnet ring 4 is coaxially fixed in the shell blind hole; this embodiment also includes a transition body 12, an end cover 13, an output shaft 2, a coil mechanism 3, a control rotary sleeve 5, a sealing plate 6, a temporary sealing mechanism 7, and a limiting mechanism 8; a first square hole is provided on the upper right side of the shell 11, a second square hole is provided on the lower right side of the shell 11, a first disassembly groove 113 and a second disassembly groove 114 are provided on the right side of the shell 11, and a first shell groove 111 and a second shell groove 112 are provided on the left end surface of the shell 11; the transition body 12 is fixedly provided on the right side of the shell 11, and the transition body 12 is axially from right to left A first transition blind hole and a second transition blind hole are coaxially provided, a shoulder is provided between the first transition blind hole and the second transition blind hole, a transition shaft hole is coaxially penetrated in the transition body 12, a transition guide hole is eccentrically penetrated in the transition body 12 along the axial direction, a first slide rod hole is provided below the transition body 12, and a second slide rod hole is provided above the transition body 12; an end cover 13 is fixedly provided on the right side of the transition body 12 to block the first transition blind hole, an end cover shaft hole is coaxially penetrated in the end cover 13, an end cover pin 131 is radially fixedly provided in the end cover shaft hole, and an end cover blind hole is coaxially provided on the left side of the end cover 13; a sealing plate 6 is slidably provided in the housing 11, a sealing shaft hole is coaxially penetrated in the sealing plate 6, a sealing groove 63 is provided on the right side of the sealing plate 6, and an O-ring is provided in the sealing groove 63; The output shaft 2 is slidably arranged in the sealing shaft hole, the transition shaft hole and the end cover shaft hole, the right end of the output shaft 2 extends out of the end cover 13, and the left end of the output shaft 2 extends out of the sealing plate 6; the coil mechanism 3 is slidably arranged in the blind hole of the shell, and the right side of the coil mechanism 3 is connected to the output shaft 2, and the coil mechanism 3 can drive the output shaft 2 to slide along the left and right directions; the temporary sealing mechanism 7 is slidably arranged in the first transition blind hole and the second transition blind hole, and the temporary sealing mechanism 7 is sleeved on the outside of the output shaft 2; the control rotary sleeve 5 is rotatably arranged on the left side of the shell 11 to control the connection state of the coil mechanism 3 and the output shaft 2; the limiting mechanism 8 is slidably arranged in the first square hole and the second square hole to limit the sealing plate 6, so that the right side of the sealing plate 6 is tightly attached to the transition body 12.

[0026] Combination Figure 1 , Figure 2 As shown, in this embodiment, an output shaft groove 21 is opened on the outer circumferential wall on the right side of the output shaft 2, and the end cover pin 131 is slidably set in the output shaft groove 21; a pillow block 22 is coaxially provided on the output shaft 2, and the pillow block 22 is arranged on the left side of the output shaft groove 21. The thickness of the pillow block 22 is the same as the depth of the blind hole of the end cover, and the diameter of the pillow block 22 is smaller than the diameter of the blind hole of the end cover. An axle pin 23 is radially provided on the left end of the output shaft 2.

[0027] Combination Figure 1 , Figure 2As shown, in this embodiment, the coil mechanism 3 includes: a coil frame 31, a coil 32, a rotating cap 33 and a rotating pin 34; the coil frame 31 is slidably arranged in the blind hole of the shell, the coil frame 31 is coaxially provided with a frame blind hole along the axial direction, the coil frame 31 is coaxially penetrated with a frame axial hole, the coil frame 31 is eccentrically penetrated with a frame guide hole along the axial direction, and the frame guide hole is coaxial with the transition guide hole; the coil 32 is fixedly sleeved on the outside of the coil frame 31, and the permanent magnet ring 4 is sleeved on the outside of the coil 32; the rotating cap 33 is rotatably connected to the coil frame 31, and the right side of the rotating cap 33 is along A rotating hole is coaxially provided in the axial direction, the rotating hole is coaxial with and connected to the axial hole of the frame body, a rotating ring groove 331 is provided on the left side of the rotating hole, a connecting groove 332 is axially provided on the inner wall of the rotating hole, and the left side of the connecting groove 332 is connected to the rotating ring groove 331; when the shaft pin 23 is placed in the rotating ring groove 331, the rotating cap 33 is coaxial with the output shaft 2 and cannot move axially relative to it; when the shaft pin 23 and the connecting groove 332 are aligned, the shaft pin 23 can slide along the connecting groove 332, so that the rotating cap 33 can slide axially relative to the output shaft 2; a rotating pin 34 is fixedly provided radially on the left side of the rotating cap 33.

[0028] At this time, by means of setting a rotating cap 33 on the coil frame 31, the output shaft 2 and the coil frame 31 can be quickly matched through the cooperation of the rotating cap 33 and the output shaft 2. When the O-ring needs to be replaced, the rotating cap 33 can be rotated to quickly separate the output shaft 2 and the coil frame 31, so that the O-ring can be quickly removed from the output shaft 2, thereby realizing rapid replacement of the O-ring and saving replacement time.

[0029] Combination Figure 1 As shown, in this embodiment, a first sealing slide rod 61 is axially provided at the lower right side of the sealing plate 6, the first sealing slide rod 61 is slidably set in the first slide rod hole, and a slide rod spring hole is coaxially provided in the first sealing slide rod 61; a second sealing slide rod 62 is axially provided at the upper right side of the sealing plate 6, the second sealing slide rod 62 is slidably set in the second slide rod hole; a sealing guide hole is eccentrically penetrated by the sealing plate 6 along the axial direction, and the sealing guide hole is coaxial with the transition guide hole and has the same diameter.

[0030] At this time, with the help of the sealing plate 6, the O-ring is installed on the sealing plate 6. Through the cooperation between the sealing plate 6 and the transition body 12, the O-ring and the output shaft 2 are sealed, and the hydraulic oil in the servo valve can be blocked outside the voice coil motor. When the O-ring needs to be replaced, the sealing plate 6 and the transition body 12 can be separated by pushing the spring 14, thereby realizing the quick removal of the O-ring, which is convenient and quick.

[0031] Combination Figure 1-Figure 3As shown, in this embodiment, the temporary sealing mechanism 7 includes: a control piston 71, a control ring 72, an annular sealing bag 73 and a control spring 74; the control piston 71 is slidably arranged in the first transition blind hole and the second transition blind hole, a piston blind hole is coaxially arranged on the right side of the control piston 71, a piston shaft hole is coaxially penetrated in the control piston 71, the output shaft 2 passes through the piston shaft hole, a piston spring blind hole is eccentrically arranged in the control piston 71 along the axial direction, a piston slide rod hole is eccentrically penetrated in the control piston 71, and the piston slide rod hole and the piston spring blind hole are arranged on the right side of the control piston 71 along the axial direction. The holes are coaxial, and a piston push rod 711 is eccentrically arranged on the left side of the control piston 71 along the axial direction. The left end of the piston push rod 711 passes through the transition guide hole, the sealing guide hole and the frame guide hole and is placed in the frame blind hole; the control ring 72 is slidably arranged in the first transition blind hole, and the shoulder prevents the control ring 72 from entering the second transition blind hole. The outer ring of the control ring 72 is provided with a first seal, and a seal can be formed between the outer ring of the control ring 72 and the first transition blind hole through the first seal. A ring shaft hole is coaxially penetrated in the control ring 72, and the output shaft 2 passes through the ring shaft hole. The pillow block 22 is arranged on the right side of the control ring 72, and a ring platform 723 is coaxially arranged on the left side of the control ring 72. The ring platform 723 is slidably arranged in the piston blind hole. A control ring slide rod 721 is eccentrically arranged on the left side of the control ring 72 along the axial direction. The control ring slide rod 721 is slidably arranged in the piston slide rod hole. A slide rod platform 722 is axially arranged on the left end of the control ring slide rod 721. The slide rod platform 722 is arranged on the left side of the piston slide rod hole and has a diameter larger than the piston slide rod hole to prevent the control ring slide rod 721 from exiting the piston slide rod hole; the annular sealing bag 73 is arranged on the piston blind hole. In the hole, the annular sealing bag 73 is sleeved on the output shaft 2, and an annular bag cavity is provided inside the annular sealing bag 73; the control spring 74 is arranged in the piston spring blind hole to drive the control piston 71 and the control ring 72 to move away from each other; when the control piston 71 and the control ring 72 move away from each other, the annular sealing bag 73 will not be squeezed, and there is a gap between the annular sealing bag 73 and the output shaft 2; when the control piston 71 and the control ring 72 are in close contact, the annular sealing bag 73 is squeezed, the annular sealing bag 73 is deformed and forms a seal with the output shaft 2.

[0032] At this time, by means of setting an annular sealing bag 73 in the transition body 12, due to the cooperation between the annular sealing bag 73 and the control piston 71, when the annular sealing bag 73 is squeezed, the annular sealing bag 73 can expand toward the middle, and then cooperate with the output shaft 2 to form a seal, so that when the O-ring on the sealing plate 6 is replaced, a seal can be formed in front of the O-ring through the annular sealing bag 73 to ensure that the hydraulic oil inside the servo valve will not flow out during replacement, and will not cause pollution.

[0033] Combination Figure 1 , Figure 2 , Figure 5As shown, in this embodiment, a rotary sleeve hole is coaxially penetrated in the control rotary sleeve 5, a rotary sleeve groove 51 is axially opened on the right inner wall of the rotary sleeve hole, a rotating pin 34 is slidably arranged in the rotary sleeve groove 51, and a telescopic groove 52 is also provided on the right inner wall of the rotary sleeve hole, a first spiral surface 521 and a second spiral surface 522 are symmetrically arranged on both sides of the telescopic groove 52, a bottom plane 523 is arranged at the bottom end of the telescopic groove 52, the lower part of the first spiral surface 521 and the lower part of the second spiral surface 522 are respectively connected to the two sides of the bottom plane 523, and the piston push rod 711 is slidably arranged in the telescopic groove 52.

[0034] At this time, by means of rotating the control rotary sleeve 5 at the rear of the shell 11, and setting a telescopic groove 52 with a first spiral surface 521 and a second spiral surface 522 on the control rotary sleeve 5, when the control rotary sleeve 5 is rotated, the telescopic groove 52 cooperates with the piston push rod 711 on the control piston 71, and then the control piston 71 can be pushed to move. When the control piston 71 moves into place, the control piston 71 cooperates with the control ring 72, which can not only position the output shaft 2, but also squeeze the annular sealing bag 73 to form a seal. At the same time, because the control rotary sleeve 5 can drive the rotation of the rotating cap 33, the coil frame 31 and the output shaft 2 can be controlled to be quickly separated, thereby reducing the steps for replacing the O-ring, which is convenient and quick, and there is no need to disassemble the present invention to replace the O-ring, so that online replacement is achieved.

[0035] Combination Figure 1 , Figure 2 , Figure 4 As shown, in the present embodiment, the limiting mechanism 8 comprises: a limiting rod 81 and a limiting spring 82; two limiting rods 81 are provided, which are slidably arranged in the first square hole and the second square hole respectively, one end of the limiting rod 81 is a square rod, and the square rod slides with the first square hole or the second square hole to control the limiting rod 81 from rotating relative to the outer shell 11, and the other end of the limiting rod 81 is provided with a limiting platform 812 to limit the limiting rod 81 from moving toward the middle, and one end of the limiting rod 81 is also provided with a limiting inclined surface 811, which can cooperate with the sealing plate 6, so that the sealing plate 6 can push the limiting rod 81 to move away from the axis of the outer shell 11 when it moves to the right; the limiting spring 82 is sleeved on the limiting rod 81 to drive the limiting rod 81 to move toward the axis of the outer shell 11.

[0036] Combination Figure 1 , Figure 2 As shown, in this embodiment, a countersink is provided on the control rotary sleeve 5, and a steel ball 91 and a positioning spring 92 are provided in the countersink. The positioning spring 92 drives the steel ball 91 to move in a direction away from the countersink.

[0037] Combination Figure 1 , Figure 2As shown, in this embodiment, when the steel ball 91 is located in the first shell groove 111, the rotating cap 33 and the output shaft 2 cannot move axially relative to each other, and the piston push rod 711 is placed in the telescopic groove 52. When the steel ball 91 is located in the first shell groove 112, the rotating cap 33 and the output shaft 2 can move axially relative to each other, and the piston push rod 711 exits the telescopic groove 52.

[0038] Combination Figure 1 As shown, in this embodiment, a push spring 14 is also included. The push spring 14 is arranged in the spring hole of the slide rod to push the sealing plate 6 away from the transition body 12.

[0039] The working principle of the voice coil motor for the servo valve is as follows:

[0040] like Figure 1 The figure shows the initial state of the present invention. When the present invention is used, the servo valve core and the right end of the output shaft 2 need to be fixedly connected first, and then the end cover 13 is fixedly connected to the servo valve body, so that a seal is formed between the servo valve body and the end cover 13. Then, the coil 32 is energized to generate a magnetic field. Since the magnetic field generated by the coil 32 interacts with the magnetic field generated by the permanent magnet ring 4, a force along the axis of the coil 32 is generated, so that the coil 32 can drive the coil frame 31 to move. By changing the direction and magnitude of the current, the direction and magnitude of the force acting on the coil 32 are controlled. Since the shaft pin 23 is in the rotating ring groove 331 at this time, the coil frame 31 and the output shaft 2 are coaxial and cannot move relative to each other in the axial direction, so that the servo valve core is driven to move by the output shaft 2 to complete the control of the servo valve.

[0041] When the present invention is used for a long time and causes the O-ring in the sealing groove 63 to wear, it is first necessary to control the equipment where the servo valve is located to stop working, and then rotate the control rotary sleeve 5. Since the rotating pin 34 slides and cooperates in the rotary sleeve groove 51, the rotating cap 33 is driven to rotate. Since the end cover pin 131 slides in the output shaft groove 21, the output shaft 2 cannot rotate, so that the rotating cap 33 rotates relative to the output shaft 2. Under the action of the first spiral surface 521 or the second spiral surface 522, the piston push rod 711 is pushed to move right, and then the control piston 71 is pushed to move right. Due to the action of the control spring 74, the control ring 72 follows and moves to the right, and the distance between the control ring 72 and the control piston 71 is maintained. When the piston push rod 711 exits the telescopic groove 52 and presses on the right end surface of the control rotary sleeve 5, the control ring 72 is tightly attached to the end cover 13, pushing the pillow block 22 into the blind hole of the end cover, thereby limiting the output shaft 2 and controlling the piston 71. 1 squeezes the control spring 74, so that the control piston 71 and the control ring 72 are close together, and the ring stage 723 enters the piston blind hole to squeeze the annular sealing bag 73, so that the annular sealing bag 73 and the output shaft 2 form a seal. Since the seal at the outer ring of the control ring 72 and the second transition blind hole form a seal, the right side of the control ring 72 forms a seal for the oil. When the control rotary sleeve 5 rotates 180 degrees, the shaft pin 23 and the connecting groove 332 are aligned, and then the limit spring 82 is overcome to pull the limit rod 81, so that the sealing plate 6 is released from the limit. Under the action of the push spring 14, the sealing plate 6 is pushed to move to the left, and the coil frame 31 is pushed to move to the left at the same time, so that the output shaft 2 and the rotating cap 33 are separated, the sealing plate 6 is away from the transition body 12, and the left end of the output shaft 2 is withdrawn from the sealing shaft hole. At this time, the sealing groove 63 is opened, and the staff enters the housing 11 through the first disassembly groove 113 or the second disassembly groove 114, and manually removes and replaces the O-ring;When the new O-ring is placed in the sealing groove 63, the sealing plate 6 is pushed to the right against the pushing spring 14. Under the action of the limiting inclined surface 811, the limiting rod 81 is pushed to overcome the limiting spring 82 and move. When the sealing plate 6 passes over the limiting rod 81, the sealing plate 6 is just in close contact with the transition body 12. The limiting spring 82 allows the limiting rod 81 to limit the sealing plate 6. At this time, the O-ring in the sealing groove 63 is sleeved on the output shaft 2 and forms a seal. Then the coil frame 31 is pushed to the right, so that the shaft pin 23 passes through the connecting groove 332 and enters the rotating ring groove 331, and then drives the control rotary sleeve 5 to rotate 180 degrees, thereby driving the rotating cap 33 and the output shaft 2 to rotate 180 degrees. The output shaft 2 is re-fitted together. At this time, since the piston push rod 711 comes to the right side of the telescopic groove 52, under the action of the control spring 74, the control piston 71 is away from the control ring 72, and the annular sealing bag 73 is separated from the output shaft 2 by its own elasticity. Then the coil 32 is energized, and the output shaft 2 is controlled to move leftward, and the control ring 72 is pushed to move leftward and reset through the pillow block 22, so that the piston push rod 711 enters the telescopic groove 52 and is close to the bottom plane 523. At this time, the present invention returns to the initial state and the replacement work is completed. When the O-ring on the sealing plate 6 is replaced, the present invention has simple steps, convenient operation, and no disassembly is required, so that online replacement can be achieved. ;

[0042] 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 voice coil motor for a servo valve, comprising a housing (11) and a permanent magnet ring (4), wherein a housing blind hole is coaxially arranged in the housing (11), a housing through hole is coaxially penetrated in the housing (11), and the permanent magnet ring (4) is coaxially fixedly arranged in the housing blind hole; characterized in that: It also includes a transition body (12), an end cover (13), an output shaft (2), a coil mechanism (3), a control rotary sleeve (5), a sealing plate (6), a temporary sealing mechanism (7), and a limiting mechanism (8); A first square hole is provided at the upper right side of the shell (11), a second square hole is provided at the lower right side of the shell (11), a first disassembly groove (113) and a second disassembly groove (114) are provided at the right side of the shell (11), and a first shell groove (111) and a second shell groove (112) are provided on the left end surface of the shell (11); The transition body (12) is fixedly arranged on the right side of the housing (11), and a first transition blind hole and a second transition blind hole are coaxially arranged in the transition body (12) from right to left in the axial direction, and a shoulder is arranged between the first transition blind hole and the second transition blind hole. A transition shaft hole is coaxially passed through the transition body (12), and a transition guide hole is eccentrically passed through the transition body (12) in the axial direction. A first slide rod hole is arranged below the transition body (12), and a second slide rod hole is arranged above the transition body (12); The end cover (13) is fixedly arranged on the right side of the transition body (12) to block the first transition blind hole, an end cover shaft hole is coaxially penetrated in the end cover (13), an end cover pin (131) is radially fixed in the end cover shaft hole, and an end cover blind hole is coaxially arranged on the left side of the end cover (13); The sealing plate (6) is slidably arranged in the housing (11), a sealing shaft hole is coaxially penetrated in the sealing plate (6), a sealing groove (63) is provided on the right side of the sealing plate (6), and an O-ring is provided in the sealing groove (63); The output shaft (2) is slidably arranged in the sealing shaft hole, the transition shaft hole and the end cover shaft hole, the right end of the output shaft (2) extends out of the end cover (13), and the left end of the output shaft (2) extends out of the sealing plate (6); The coil mechanism (3) is slidably disposed in the blind hole of the housing, the right side of the coil mechanism (3) is connected to the output shaft (2), and the coil mechanism (3) can drive the output shaft (2) to slide in the left-right direction; The temporary sealing mechanism (7) is slidably arranged in the first transition blind hole and the second transition blind hole, and the temporary sealing mechanism (7) is sleeved on the outside of the output shaft (2); The control rotary sleeve (5) is rotatably arranged on the left side of the housing (11) to control the connection state between the coil mechanism (3) and the output shaft (2); The limiting mechanism (8) is slidably disposed in the first square hole and the second square hole to limit the sealing plate (6) so that the right side of the sealing plate (6) is in close contact with the transition body (12).

2. A voice coil motor for a servo valve according to claim 1, characterized in that: An output shaft groove (21) is formed on the right outer circumferential wall of the output shaft (2), and the end cover pin (131) is slidably arranged in the output shaft groove (21); a pillow block (22) is coaxially arranged on the output shaft (2), and the pillow block (22) is arranged on the left side of the output shaft groove (21); the thickness of the pillow block (22) is the same as the depth of the blind hole of the end cover, and the diameter of the pillow block (22) is smaller than the diameter of the blind hole of the end cover; and a shaft pin (23) is radially arranged on the left end of the output shaft (2).

3. A voice coil motor for a servo valve according to claim 2, characterized in that: The coil mechanism (3) comprises: a coil frame (31), a coil (32), a rotating cap (33) and a rotating pin (34); The coil frame (31) is slidably arranged in the blind hole of the housing, a frame blind hole is coaxially arranged in the coil frame (31) along the axial direction, a frame axial hole is coaxially penetrated in the coil frame (31), a frame guide hole is eccentrically penetrated in the coil frame (31) along the axial direction, and the frame guide hole is coaxial with the transition guide hole; The coil (32) is fixedly sleeved on the outside of the coil frame (31), and the permanent magnet ring (4) is sleeved on the outside of the coil (32); The rotating cap (33) is rotatably connected to the coil frame (31); a rotating hole is coaxially provided on the right side of the rotating cap (33) along the axial direction; the rotating hole is coaxial with and communicates with the frame body axial hole; a rotating ring groove (331) is provided on the left side of the rotating hole; a connecting groove (332) is axially provided on the inner wall of the rotating hole; the connecting groove (332) is communicated with the rotating ring groove (331) on the left side; When the shaft pin (23) is placed in the rotating annular groove (331), the rotating cap (33) is coaxial with the output shaft (2) and cannot move axially relative to the output shaft (2); when the shaft pin (23) and the connecting groove (332) are aligned, the shaft pin (23) can slide along the connecting groove (332), so that the rotating cap (33) can slide axially relative to the output shaft (2); A rotating pin (34) is fixedly provided radially on the left side of the rotating cap (33).

4. The voice coil motor for a servo valve according to claim 3, characterized in that: A first sealing slide bar (61) is axially arranged at the lower right side of the sealing plate (6), the first sealing slide bar (61) is slidably arranged in the first slide bar hole, and a slide bar spring hole is coaxially arranged in the first sealing slide bar (61); a second sealing slide bar (62) is axially arranged at the upper right side of the sealing plate (6), the second sealing slide bar (62) is slidably arranged in the second slide bar hole; a sealing guide hole is eccentrically penetrated through the sealing plate (6) along the axial direction, the sealing guide hole is coaxial with the transition guide hole and has the same diameter.

5. The voice coil motor for a servo valve according to claim 4, characterized in that: The temporary sealing mechanism (7) comprises: a control piston (71), a control ring (72), an annular sealing bag (73) and a control spring (74); The control piston (71) is slidably arranged in the first transition blind hole and the second transition blind hole, a piston blind hole is coaxially arranged on the right side of the control piston (71) along the axial direction, a piston shaft hole is coaxially penetrated in the control piston (71), the output shaft (2) passes through the piston shaft hole, a piston spring blind hole is eccentrically arranged in the control piston (71) along the axial direction, a piston slide rod hole is eccentrically penetrated in the control piston (71), the piston slide rod hole and the piston spring blind hole are coaxial, a piston push rod (711) is eccentrically arranged on the left side of the control piston (71) along the axial direction, and the left end of the piston push rod (711) passes through the transition guide hole, the sealing guide hole and the frame guide hole and is placed in the frame blind hole; The control ring (72) is slidably arranged in the first transition blind hole, the shoulder prevents the control ring (72) from entering the second transition blind hole, the outer ring of the control ring (72) is provided with a first sealing member, and a seal can be formed between the outer ring of the control ring (72) and the first transition blind hole through the first sealing member, the control ring (72) is coaxially provided with a ring shaft hole, the output shaft (2) passes through the ring shaft hole, the pillow block (22) is arranged on the right side of the control ring (72), and the left side of the control ring (72) is coaxially provided with a ring shaft hole. The shaft is provided with a ring platform (723), the ring platform (723) is slidably arranged in the piston blind hole, a control ring slide rod (721) is eccentrically arranged on the left side of the control ring (72) along the axial direction, the control ring slide rod (721) is slidably arranged in the piston slide rod hole, and a slide rod platform (722) is axially arranged at the left end of the control ring slide rod (721), the slide rod platform (722) is arranged on the left side of the piston slide rod hole, and has a diameter larger than the piston slide rod hole, so as to prevent the control ring slide rod (721) from exiting the piston slide rod hole; The annular sealing bag (73) is arranged in the blind hole of the piston, the annular sealing bag (73) is sleeved on the output shaft (2), and an annular bag cavity is arranged inside the annular sealing bag (73); The control spring (74) is arranged in the piston spring blind hole, and is used to drive the control piston (71) and the control ring (72) to move away from each other; When the control piston (71) and the control ring (72) move away from each other, the annular sealing bag (73) is not squeezed, and a gap exists between the annular sealing bag (73) and the output shaft (2); when the control piston (71) and the control ring (72) are in close contact, the annular sealing bag (73) is squeezed, the annular sealing bag (73) is deformed, and forms a seal with the output shaft (2).

6. The voice coil motor for a servo valve according to claim 5, characterized in that: A rotary sleeve hole is coaxially provided inside the control rotary sleeve (5), a rotary sleeve groove (51) is axially provided on the right inner wall of the rotary sleeve hole, the rotary pin (34) is slidably arranged in the rotary sleeve groove (51), and a telescopic groove (52) is also provided on the right inner wall of the rotary sleeve hole, a first helical surface (521) and a second helical surface (522) are symmetrically provided on both sides of the telescopic groove (52), a bottom plane (523) is provided at the bottom end of the telescopic groove (52), the lower part of the first helical surface (521) and the lower part of the second helical surface (522) are respectively connected to both sides of the bottom plane (523), and the piston push rod (711) is slidably arranged in the telescopic groove (52).

7. The voice coil motor for a servo valve according to claim 6, characterized in that: The limiting mechanism (8) comprises: a limiting rod (81) and a limiting spring (82); Two limit rods (81) are provided, which are slidably arranged in the first square hole and the second square hole respectively; one end of the limit rod (81) is a square rod, and the square rod is slidably matched with the first square hole or the second square hole to control the limit rod (81) from rotating relative to the housing (11); the other end of the limit rod (81) is provided with a limit platform (812) to limit the limit rod (81) from moving toward the middle; one end of the limit rod (81) is also provided with a limit inclined surface (811), and the limit inclined surface (811) can cooperate with the sealing plate (6), so that the sealing plate (6) can push the limit rod (81) to move in a direction away from the axis of the housing (11) when moving to the right; The limit spring (82) is sleeved on the limit rod (81) to drive the limit rod (81) to move in a direction close to the axis of the housing (11).

8. The voice coil motor for a servo valve according to claim 7, characterized in that: The control rotary sleeve (5) is provided with a countersink, and a steel ball (91) and a positioning spring (92) are arranged in the countersink. The positioning spring (92) drives the steel ball (91) to move in a direction away from the countersink.

9. The voice coil motor for a servo valve according to claim 8, characterized in that: When the steel ball (91) is located in the first housing groove (111), the rotating cap (33) and the output shaft (2) cannot move axially relative to each other, and the piston push rod (711) is placed in the telescopic groove (52); when the steel ball (91) is located in the first housing groove (112), the rotating cap (33) and the output shaft (2) can move axially relative to each other, and the piston push rod (711) exits the telescopic groove (52).

10. The voice coil motor for a servo valve according to claim 9, characterized in that: It also includes a push spring (14), wherein the push spring (14) is arranged in the spring hole of the slide rod and is used to push the sealing plate (6) away from the transition body (12).

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