Front displacement sensor structure of servo proportional valve

Abstract

The utility model discloses a preposed displacement sensor structure of a servo proportional valve, which comprises a displacement sensor, a valve body assembly and a proportional electromagnet, the displacement sensor comprises a shell, when the preposed displacement sensor structure is used, after the displacement sensor is preposed, the valve body assembly is arranged between the displacement sensor and the proportional electromagnet, and the proportional electromagnet is arranged in the shell. Signal interference on the displacement sensor caused by a magnetic field generated when the proportional electromagnet works is reduced, and the displacement sensor can reduce use of a threaded structural member and can be in direct contact with one end of the valve element, so that the displacement amount of the valve element can be more conveniently and accurately sensed; when mechanical electrical zero adjustment is needed after the servo proportional valve works for a period of time and is maintained, only the round handle needs to be screwed off, the depth of the adjusting screw is rotated to enable the magnetic induction ring to be restored to the center position, the initial position of the valve element can be recalibrated, it is ensured that the servo proportional valve can correctly control movement of a load under various working conditions, and the working efficiency is improved. Therefore, the stability and response speed of the system are improved.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a servo proportional valve front displacement sensor structure. Background Technology

[0002] Displacement sensors, also known as linear sensors, are linear devices that use metal induction. Their function is to convert various measured physical quantities into electrical quantities. In the production process, displacement measurement is generally divided into two types: measuring physical dimensions and measuring mechanical displacement. According to the different forms of transformation of the measured variable, displacement sensors can be divided into analog and digital types.

[0003] In existing servo proportional valves, the positional limitations of the displacement sensor increase the difficulty of adjustment and maintenance in practical applications. To address this issue, we propose a front-mounted displacement sensor structure for servo proportional valves. Utility Model Content

[0004] One of the objectives of this utility model is achieved through the following technical solution:

[0005] A servo proportional valve pre-positioned displacement sensor structure includes a displacement sensor, a valve body assembly, and a proportional electromagnet. The displacement sensor includes a housing, and the inner cavity of the housing is provided with a magnetically shielding sleeve. The inner cavity of the magnetically shielding sleeve is provided with a fixed seat, and the inner cavity of the fixed seat is slidably connected to a push rod. The outer wall of the push rod is fitted with a magnetic induction ring. The left side of the inner cavity of the housing is rotatably connected to a spring seat, and the outer wall of the spring seat is fitted with a main spring. The right end of the main spring is fitted with the fixed seat. The inner cavity of the spring seat is provided with a bushing, and the left end of the push rod is inserted into the inner cavity of the bushing. The outer side of the magnetically shielding sleeve is provided with a skeleton.

[0006] A primary coil is fitted at the middle of the frame, and a first-stage coil and a second-stage coil are fitted on the left and right sides of the frame, respectively. A wave-shaped dielectric is provided between the right side of the frame and the magnetic shielding sleeve. An adjusting screw is threadedly connected to the bottom of the outer shell, and a round handle connected to the adjusting screw is rotatably connected to the left side of the outer shell. The valve body assembly includes a valve block, which is located on the right side of the outer shell. A valve sleeve is provided in the inner cavity of the valve block, and a valve core is provided in the inner cavity of the valve sleeve. The proportional electromagnet is located on the right side of the valve block.

[0007] Furthermore, both the outer shell and the bottom of the proportional electromagnet are provided with connecting plates, and a movable shaft runs longitudinally through the connecting plates. Support plates are provided on the front and rear sides of the two connecting plates, and the bottom of two adjacent support plates are fixedly connected to the same base plate. Each support plate has a through hole near the top that matches the movable shaft, and the ends of the two movable shafts that are far apart pass through the inner cavities of the adjacent through holes. Limiting rings are fitted and fixed on the outer walls of the two movable shafts, and the limiting rings are in contact with the inner sidewalls of the support plates.

[0008] Furthermore, a C-shaped plate is provided on the outer side of the front end of the movable shaft, and a square hole is provided on the C-shaped plate. A square rod adapted to it slides through the inner cavity of the square hole. A square blind hole adapted to the square rod is provided at the front end of the movable shaft, and the rear end of the movable shaft is inserted into the inner cavity of the square blind hole. A pull head is fixedly connected to the front end of the movable shaft, and a return spring is sleeved on the front end of the outer wall of the movable shaft. The two ends of the return spring are fixedly connected to the C-shaped plate and the pull head, respectively.

[0009] Furthermore, the two support plates located on the right side are fixedly connected to the same protective plate on their right side, and the protective plate has a fixing groove on its right side.

[0010] Furthermore, the base plate has two fixing holes distributed front and back.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. By placing the displacement sensor at the front, with a valve body assembly separating it from the proportional electromagnet, the signal interference caused by the magnetic field generated by the proportional electromagnet during operation is reduced. Furthermore, the displacement sensor reduces the use of threaded structural components and can directly contact one end of the valve core, making it more effective in accurately sensing the valve core's displacement. Additionally, when the servo proportional valve requires mechanical electrical zeroing after a period of operation, simply unscrew the round handle and rotate the adjusting screw to return the magnetic induction ring to its center position. This allows for recalibration of the valve core's initial position, ensuring the servo proportional valve can correctly control the load's movement under various operating conditions, thereby improving system stability and response speed.

[0013] 2. By using the connecting plate, movable shaft, support plate, limit ring, base plate, C-shaped plate, square blind hole, square rod, pull head, and return spring, the support plates on both sides can be unfolded to keep them perpendicular to the displacement sensor. Then, bolts can be inserted into the fixing holes for easy installation of the displacement sensor. When the support plate is flipped over and kept parallel to the displacement sensor, the measuring rod of the displacement sensor can be covered and protected by the protective plate and fixing groove, which helps to improve the safety of the sensor during transportation. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the first embodiment;

[0015] Figure 2 This is a schematic diagram of the front sectional view of the outer shell of the first embodiment;

[0016] Figure 3 This is a three-dimensional structural diagram of the second embodiment;

[0017] Figure 4 This is a schematic diagram of the three-dimensional disassembled structure of the C-shaped plate and the support plate in the second embodiment.

[0018] In the diagram: 1. Displacement sensor; 2. Valve body assembly; 3. Proportional electromagnet; 4. Secondary coil; 5. Primary coil; 6. Primary coil; 7. Frame; 8. Magnetic insulating sleeve; 9. Main spring; 10. Spring seat; 11. Bushing; 12. Push rod; 13. Round handle; 14. Fixing seat; 15. Adjusting screw; 16. Magnetic induction ring; 17. Housing; 18. Wave separator; 19. Valve block; 20. Valve sleeve; 21. Valve core; 22. Base plate; 23. Fixing hole; 24. Support plate; 25. Connecting plate; 26. Movable shaft; 27. Limiting ring; 28. C-shaped plate; 29. ​​Square rod; 30. Square blind hole; 31. Pull head; 32. Return spring; 33. Protective plate; 34. Fixing groove. Detailed Implementation

[0019] This utility model provides the following technical solution:

[0020] Example 1, please refer to Figure 1 and Figure 2 :

[0021] A servo proportional valve front displacement sensor structure includes a displacement sensor 1, a valve body assembly 2, and a proportional electromagnet 3. The displacement sensor 1 includes a housing 17, and the inner cavity of the housing 17 is provided with a magnetic shielding sleeve 8. The inner cavity of the magnetic shielding sleeve 8 is provided with a fixed seat 14, and the inner cavity of the fixed seat 14 is slidably connected to a push rod 12. The outer wall of the push rod 12 is fitted with a magnetic induction ring 16. The left side of the inner cavity of the housing 17 is rotatably connected to a spring seat 10, and the outer wall of the spring seat 10 is fitted with a main spring 9. The right end of the main spring 9 is fitted with the fixed seat 14. The inner cavity of the spring seat 10 is provided with a bushing 11, and the left end of the push rod 12 is inserted into the inner cavity of the bushing 11. The outer side of the magnetic shielding sleeve 8 is provided with a skeleton 7.

[0022] A primary coil 5 is fitted at the middle of the frame 7. A first-stage coil 6 and a second-stage coil 4 are fitted on the left and right sides of the frame 7, respectively. A wave-shaped medium 18 is provided between the right side of the frame 7 and the magnetic shielding sleeve 8. An adjusting screw 15 is threadedly connected to the bottom of the outer shell 17. A round handle 13 connected to the adjusting screw 15 is rotatably connected to the left side of the outer shell 17. The valve body assembly 2 includes a valve block 19, which is located on the right side of the outer shell 17. A valve sleeve 20 is provided in the inner cavity of the valve block 19, and a valve core 21 is provided in the inner cavity of the valve sleeve 20. A proportional electromagnet 3 is located on the right side of the valve block 19.

[0023] Working Principle: When in use, this utility model, based on the input and output characteristics of the servo proportional valve, receives a ±10V control signal from the servo proportional valve amplifier board. After amplification, it outputs a corresponding current signal. The magnetic field generated by the current signal in the servo proportional valve coil drives the proportional electromagnet 3 to move by a corresponding displacement, thereby moving the valve core 21 of the servo proportional valve and outputting a corresponding flow rate. The output flow rate is proportionally linearly related to the input control signal. While the valve core 21 moves, the built-in displacement sensor 1 detects the position of the valve core 21 and feeds its signal back to the proportional amplifier, forming a closed-loop position control with the proportional electromagnet 3. The proportional electromagnet 3 controls the switching, on / off, and flow rate output of the oil circuit by controlling the displacement of the valve core 21 from its center position. This allows for precise control of parameters such as pressure, position, flow rate, and speed of the liquid flow in the hydraulic system, reducing energy consumption, making the system work more stably, and improving the accuracy and reliability of the system.

[0024] With displacement sensor 1 positioned in front, a valve body assembly 2 separates it from proportional electromagnet 3. This reduces signal interference caused by the magnetic field generated by proportional electromagnet 3 during operation. Furthermore, displacement sensor 1 reduces the use of threaded components and allows direct contact with one end of valve core 21, making it more accurate in sensing the displacement of valve core 21. When the magnetic induction ring 16 in displacement sensor 1 moves away from the product's set center position due to the movement of valve core 21, the primary coil 5 generates an alternating magnetic flux, causing changes in voltage or current in the primary coil 6 and secondary coil 4. Since the primary coil 6 and secondary coil 4 are divided into two parts with opposite polarities... Therefore, when the magnetic induction ring 16 moves, the difference in electromotive force induced in the first-stage coil 6 and the second-stage coil 4 changes. This difference is the output signal of the displacement sensor 1. This output signal is proportional to the displacement of the magnetic induction ring 16. Therefore, the displacement of the valve core 21 can be determined by measuring this output signal. When the servo proportional valve needs to be mechanically and electrically zeroed after maintenance for a period of time, simply unscrew the round handle 13 and rotate the adjusting screw 15 to restore the magnetic induction ring 16 to the center position. The initial position of the valve core 21 can be recalibrated to ensure that the servo proportional valve can correctly control the movement of the load under various working conditions, thereby improving the stability and response speed of the system.

[0025] Example 2, please refer to Figure 3 and Figure 4 :

[0026] Both the outer casing 17 and the proportional electromagnet 3 are provided with connecting plates 25 at their bottoms, and a movable shaft 26 runs longitudinally through the connecting plates 25. Support plates 24 are provided on the front and rear sides of the two connecting plates 25, and the bottoms of two adjacent support plates 24 are fixedly connected to the same base plate 22. Each support plate 24 has a through hole near its top that is adapted to the movable shaft 26, and the ends of the two movable shafts 26 that are far apart pass through the inner cavities of the adjacent through holes. Limiting rings 27 are fitted and fixed on the outer walls of the two movable shafts 26, and the limiting rings 27 are in contact with the inner sidewalls of the support plates 24. The base plate 22 has two fixing holes 23 distributed front and rear. The displacement sensor 1 is vertically supported by the support plates 24 and the base plate 22, thereby improving the ease of installation of the displacement sensor 1.

[0027] A C-shaped plate 28 is provided on the outer side of the front end of the movable shaft 26, and a square hole is provided on the C-shaped plate 28. A square rod 29 that is adapted to it slides through the inner cavity of the square hole. A square blind hole 30 that is adapted to the square rod 29 is provided at the front end of the movable shaft 26, and the rear end of the movable shaft 26 is inserted into the inner cavity of the square blind hole 30. A pull head 31 is fixedly connected to the front end of the movable shaft 26, and a return spring 32 is sleeved on the front end of the outer wall of the movable shaft 26. The two ends of the return spring 32 are fixedly connected to the C-shaped plate 28 and the pull head 31 respectively. By inserting the square rod 29 into the square blind hole 30, the flip angle of the support plate 24 can be adjusted. Thus, the support plate 24 can be perpendicular to the displacement sensor 1, and at the same time, the support plate 24 can be parallel to the displacement sensor 1.

[0028] The two support plates 24 on the right side are fixedly connected to the same protective plate 33, and the protective plate 33 has a fixing groove 34 on the right side. When the support plate 24 is parallel to the displacement sensor 1, the measuring rod on the displacement sensor 1 can be stored in the inner cavity of the fixing groove 34, thereby avoiding the displacement sensor 1 from being bent and damaged by collision during transportation.

[0029] Working principle: In use, the square rod 29 is inserted into the inner cavity of the square blind hole 30, and the pull head 31 is tightened by the return spring 32, thus preventing the square rod 29 from detaching from the inner cavity of the square blind hole 30. The parallel alignment of the support plate 24 with the displacement sensor 1 causes the protective plate 33 to rotate synchronously, thereby covering the measuring rod of the displacement sensor 1 with the fixing groove 34, thus protecting the measuring rod of the displacement sensor 1. When it is necessary to unfold the support plate 24 and the base plate 22, first pull the square rod 29 out of the inner cavity of the square blind hole 30. Then, rotate the support plate 24 and cause the base plate 22 to rotate synchronously. After rotating the support plate 24 ninety degrees, the square rod 29 can be inserted back into the inner cavity of the square blind hole 30, thereby locking the support plate 24. Then, the displacement sensor 1 can be installed by passing the bolt through the inner cavity of the fixing hole 23.

Claims

1. A servo proportional valve pre-positioned displacement sensor structure, comprising a displacement sensor (1), a valve body assembly (2), and a proportional electromagnet (3), characterized in that: The displacement sensor (1) includes a housing (17), and the inner cavity of the housing (17) is provided with a magnetic shielding sleeve (8). The inner cavity of the magnetic shielding sleeve (8) is provided with a fixed seat (14), and the inner cavity of the fixed seat (14) is slidably connected with a push rod (12). The outer wall of the push rod (12) is fitted with a magnetic induction ring (16). The left side of the inner cavity of the housing (17) is rotatably connected with a spring seat (10), and the outer wall of the spring seat (10) is fitted with a main spring (9). The right end of the main spring (9) is fitted with the fixed seat (14). The inner cavity of the spring seat (10) is provided with a bushing (11), and the left end of the push rod (12) is inserted into the inner cavity of the bushing (11). The outer side of the magnetic shielding sleeve (8) is provided with a skeleton (7).

2. The servo proportional valve pre-positioned displacement sensor structure as described in claim 1, characterized in that: A primary coil (5) is fitted at the middle of the frame (7). A first-stage coil (6) and a second-stage coil (4) are fitted on the left and right sides of the frame (7), respectively. A wave medium (18) is provided between the right side of the frame (7) and the magnetic shielding sleeve (8). An adjusting screw (15) is threaded on the shell (17) near the bottom. A round handle (13) connected to the adjusting screw (15) is rotatably connected to the left side of the shell (17). The valve body assembly (2) includes a valve block (19). The valve block (19) is located on the right side of the shell (17). A valve sleeve (20) is provided in the inner cavity of the valve block (19). A valve core (21) is provided in the inner cavity of the valve sleeve (20). The proportional electromagnet (3) is located on the right side of the valve block (19).

3. The servo proportional valve pre-positioned displacement sensor structure as described in claim 1, characterized in that: The bottom of the outer shell (17) and the proportional electromagnet (3) are provided with connecting plates (25), and a movable shaft (26) runs through the connecting plate (25) longitudinally. Support plates (24) are provided on the front and rear sides of the two connecting plates (25), and the bottom of the two adjacent support plates (24) are fixedly connected to the same base plate (22). Each support plate (24) has a through hole near the top that is adapted to the movable shaft (26), and the ends of the two movable shafts (26) that are far apart pass through the inner cavity of the adjacent through hole respectively. Limiting rings (27) are fixedly sleeved on the outer wall of the two movable shafts (26), and the limiting rings (27) are in contact with the inner side wall of the support plate (24).

4. The servo proportional valve pre-positioned displacement sensor structure as described in claim 3, characterized in that: The front end of the movable shaft (26) is covered with a C-shaped plate (28), and a square hole is provided on the C-shaped plate (28). A square rod (29) adapted to it slides through the inner cavity of the square hole. A square blind hole (30) adapted to the square rod (29) is provided at the front end of the movable shaft (26), and the rear end of the movable shaft (26) is inserted into the inner cavity of the square blind hole (30). A pull head (31) is fixedly connected to the front end of the movable shaft (26), and a return spring (32) is sleeved at the front end of the outer wall of the movable shaft (26). The two ends of the return spring (32) are fixedly connected to the C-shaped plate (28) and the pull head (31) respectively.

5. The servo proportional valve pre-positioned displacement sensor structure as described in claim 3, characterized in that: The two support plates (24) located on the right side are fixedly connected to the same protective plate (33), and the protective plate (33) has a fixing groove (34) on the right side.

6. The servo proportional valve pre-positioned displacement sensor structure as described in claim 3, characterized in that: The base plate (22) has two fixing holes (23) distributed in the front and back.

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