A self-recovering mechanical magnetostrictive displacement sensor

Abstract

The utility model provides a kind of self-recovery mechanical magnetostrictive displacement sensor, including magnetostrictive displacement sensor and the sealed cavity of being provided with sealed cavity, electronic bin is fixedly connected in one side of sealed cavity, measuring rod is inserted into sealed cavity and penetrates its sealed cavity;Piston rod is sleeved on the free end end portion of measuring rod and is slidably connected with it, the inner end tip of piston rod is located in sealed cavity and is fixedly connected with the magnetic ring seat of magnetostrictive displacement sensor, and magnetic ring is fixedly installed in magnetic ring seat, and magnetic ring is sleeved on measuring rod and is slidably connected with it;The outer end tip of piston rod is the linkage part for contacting or connecting the object to be measured;Sealed cavity indirectly supports the free end of measuring rod by piston rod, so that both ends of measuring rod are supported, and cooperate the effect of linear bearing, to improve the stability in the movement of piston rod, and further improve the service life of the stability of the function of the utility model and through-hole inner sealing structure.

Description

Technical Field

[0001] This utility model relates to displacement sensors, specifically to a self-recovering mechanical magnetostrictive displacement sensor. Background Technology

[0002] There are seven main types of displacement sensors: 1. Potentiometer type, 2. LVDT type, 3. Magnetostrictive type, 4. Eddy current type, 5. Laser triangulation type, 6. Photoelectric encoder type, 7. Ultrasonic type; There are five types of self-resetting mechanical sensors: 1. Spring reset potentiometer, 2. Self-resetting (spring) LVDT, 3. Mechanical (torsion spring) encoder, 4. Elastic beam type (material elastic deformation) sensor, 5. Spring type reed switch.

[0003] The self-resetting mechanical magnetostrictive displacement sensor is an improvement upon the traditional magnetostrictive displacement sensor by adding a self-resetting mechanical device. This solves the problem of rigid connections in traditional displacement sensors, allowing for flexible connections and significantly expanding the application range of magnetostrictive displacement sensors. In underwater or liquid environments, the self-resetting mechanical magnetostrictive displacement sensor requires sealing to ensure the proper functioning of its internal components. However, existing self-resetting mechanical magnetostrictive displacement sensors suffer from poor sealing between the telescopic rod and the housing, and the sealing components have a short lifespan, requiring frequent maintenance. Utility Model Content

[0004] To address the problems in the existing technology, this utility model provides a self-recovering mechanical magnetostrictive displacement sensor, aiming to improve the stability of the sealing function between the telescopic rod and the housing.

[0005] A self-resetting mechanical magnetostrictive displacement sensor includes a magnetostrictive displacement sensor and a sealed cavity with a sealed chamber. The electronic compartment of the magnetostrictive displacement sensor is fixedly connected to one side of the sealed cavity and sealed thereto. The probe of the magnetostrictive displacement sensor passes through the sealed cavity. A through hole is provided on the side wall of the sealed cavity corresponding to the free end of the probe. The free end of the probe is located in the through hole. A piston rod is fitted onto the free end of the probe and slides therewith. The inner end of the piston rod is located in the sealed cavity and is fixedly connected to the magnetic ring seat of the magnetostrictive displacement sensor. A magnetic ring is fixedly installed in the magnetic ring seat and is fitted onto the probe and slides along the probe with the magnetic ring seat. The middle part of the piston rod slides with the inner wall of the through hole and the two are sealed together. The outer end of the piston rod is a linkage part for contacting or connecting to the moving body to be measured. A linear spring is provided in the sealed cavity, coaxially arranged with the probe. One end of the linear spring abuts against the magnetic ring seat, and the other end of the linear spring is fixed.

[0006] Furthermore, the linear spring is a compression spring and is in a compressed state.

[0007] Furthermore, the linear spring is a return spring.

[0008] Furthermore, a linear bearing and several O-rings are provided between the through hole and the piston rod. The linear bearing is interference-fitted with the through hole, and the O-rings are embedded in the inner wall of the through hole and abut against the piston rod.

[0009] Furthermore, a linear bearing is provided between the magnetic ring seat and the measuring rod, and the linear bearing is fixedly installed inside the magnetic ring seat.

[0010] Further, a magnetic shielding pad is placed between the linear bearing and the magnetic ring.

[0011] Furthermore, the sealed cavity includes a fixed sleeve and a fixed flange. One end face of the fixed flange is fixedly connected to and sealed with the electronic compartment, and the other end of the fixed flange is an open structure. One end of the fixed sleeve is an open structure, and the other end of the fixed sleeve is provided with the through hole. The outer wall of the open end of the fixed sleeve is provided with an annular countersunk, which is fitted inside the open end of the fixed flange and is press-fitted and welded to it.

[0012] Furthermore, an integrated connector is provided on the electronic compartment, and the end of the measuring rod is inserted into the connector. A connecting sleeve is integrated on the fixed flange corresponding to the position of the connector. The connecting sleeve is fitted onto the connector and fits against it. The end faces of the electronic compartment and the fixed flange are fitted together and bolted together. O-rings are provided between the connecting sleeve and the connector, and between the end faces of the electronic compartment and the fixed flange.

[0013] Furthermore, a wear-resistant ball head is snapped into the outer end of the piston rod.

[0014] Furthermore, the piston rod, the sealed cavity, and the outer shell of the electronic compartment are all made of stainless steel.

[0015] The beneficial effects of this utility model are as follows: the sealing cavity indirectly supports the free end of the measuring rod through the piston rod, so that both ends of the measuring rod are supported. In conjunction with the action of the linear bearing, the stability of the piston rod during movement is improved, thereby improving the stability of the function of this utility model and the service life of the sealing structure inside the through hole. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings. Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The directional terms such as left, center, right, top, and bottom in the embodiments of the present invention are only relative concepts or referenced to the normal use state of the product, and should not be considered restrictive.

[0018] A self-recovering mechanical magnetostrictive displacement sensor, such as Figure 1 As shown, the device includes a magnetostrictive displacement sensor and a sealed cavity 1 with a sealed chamber. The electronic chamber 20 of the magnetostrictive displacement sensor is fixedly connected to one side of the sealed cavity 1 and sealed therewith. The fixed end of the probe 22 of the magnetostrictive displacement sensor is fixedly connected to the electronic chamber 20. The sealed cavity 1 has a cylindrical structure, and the probe 22 passes through the sealed cavity 1. A through hole 112 is provided on the side wall of the sealed cavity 1 at the position corresponding to the free end of the probe 22. The free end of the probe 22 is located in the through hole 112. In other embodiments, the free end of the probe 22 can pass through the through hole 112. A piston rod 3 is sleeved on the free end of the probe 22 and slides therewith. The inner end of the piston rod 3 is located in the sealed cavity and is connected to the probe 22. The magnetostrictive displacement sensor has a fixed magnetic ring seat 24, and a magnetic ring 23 is fixedly installed inside the magnetic ring seat 24. The magnetic ring 23 is sleeved on the measuring rod 22 and slides along the measuring rod 22 together with the magnetic ring seat 24. The middle part of the piston rod 3 slides and engages with the inner wall of the through hole 112 and the two are sealed together. The outer end of the piston rod 3 is a linkage part for contacting or connecting the moving body to be measured. A wear-resistant ball head 4 is snapped into the outer end of the piston rod 3. The side wall of the sealed cavity indirectly supports the measuring rod 22 through the piston rod 3, thereby improving the structural stability of the measuring rod 22 and the piston rod 3. A linear spring 7 is set in the sealed cavity and is coaxial with the measuring rod 22. One end of the linear spring 7 abuts against the magnetic ring seat 24, and the other end of the linear spring 7 is fixedly set, that is, abuts against the side wall of the sealed cavity.

[0019] When used underwater in seawater, the sensor needs to be resistant to seawater corrosion, withstand underwater pressure, and maintain a tight seal. Furthermore, the piston rod must not be forced into the sealed cavity by water pressure while underwater. Therefore, a linear spring can be configured as a compression spring and kept in a compressed state. When the sensor is operating underwater, it resists water pressure and keeps the piston rod extended. Simultaneously, the piston rod, the sealed cavity, and the outer shell of the electronic compartment are all made of stainless steel, specifically 316L stainless steel conforming to ASTM A240 standards. 316L stainless steel has extremely high corrosion resistance, good mechanical properties, excellent weldability, and can withstand underwater pressure. In other embodiments, i.e., in scenarios where the sensor is used in air, the linear spring can also be configured as a return spring to keep the piston rod extended when no external force is applied.

[0020] A linear bearing 5 and several O-rings are provided between the through hole 112 and the piston rod 3. The linear bearing 5 is interference-fitted with the through hole 112, and at least two O-rings are embedded in the inner wall of the through hole 112 and abut against the piston rod 3. This improves the stability of the sliding fit between the piston rod 3 and the side wall of the sealing cavity, thereby ensuring the stability of the O-ring shape when the piston rod 3 and the side wall of the sealing cavity slide relative to each other, thus ensuring the sealing performance of the O-rings and improving their service life. A linear bearing 5 is provided between the magnetic ring seat 24 and the measuring rod 22. The linear bearing 5 is fixedly installed inside the magnetic ring seat 24. That is, an annular receiving groove 241 is provided inside the magnetic ring seat 24. The linear bearing 5 and the magnetic ring 23 are both fitted inside the receiving groove 241. A magnetic shielding gasket 6 is provided between the linear bearing 5 and the magnetic ring 23. A magnetic ring cover plate 25 is fixedly connected to the magnetic ring seat 24. The magnetic ring cover plate 25 seals the opening of the receiving groove 241. The linear bearing 5 inside the magnetic ring seat 24 cooperates with the linear bearing 5 inside the through hole 112 to provide stable support for the piston rod 3 from two points, further improving the stability of the displacement movement of the piston rod 3.

[0021] The sealed cavity 1 includes a fixing sleeve 11 and a fixing flange 12. One end face of the fixing flange 12 is fixedly connected to and sealed with the electronic compartment 20, while the other end of the fixing flange 12 is open. One end of the fixing sleeve 11 is open, and the other end of the fixing sleeve 11 is provided with the through hole 112. The outer wall of the open end of the fixing sleeve 11 is provided with an annular countersunk 111, which is fitted inside the open end of the fixing flange 12 and is press-fitted and welded to it. A connecting connector is integrally provided on the electronic compartment 20. The ends of the probe 21 and the measuring rod 22 are inserted into the connecting joint 21. A connecting sleeve 121 is integrally provided on the fixed flange 12 corresponding to the position of the connecting joint 21. The connecting sleeve 121 is fitted onto the connecting joint 21 and fits against it. The end faces of the electronic compartment 20 and the fixed flange 12 are fitted together and bolted together. O-rings are provided between the connecting sleeve 121 and the connecting joint 21 and between the end faces of the electronic compartment 20 and the fixed flange 12, thereby sealing the electronic compartment 20 and the fixed flange 12 in the radial and axial directions.

[0022] During operation, the moving body under test contacts the wear-resistant ball head 4 and pushes the piston rod 3 to compress the linear spring 7 through irregular reciprocating movement. Under the action of the linear spring 7, the wear-resistant ball head 4 is always in contact with the moving body under test. When the piston rod 3 indirectly drives the magnetic ring 23 to move on the measuring rod 22 through the magnetic ring seat 24, the displacement of the moving body under test can be inferred from the displacement of the magnetic ring 23 measured by the magnetostrictive displacement sensor.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A self-restoring mechanical magnetostrictive displacement sensor, characterized in that: The device includes a magnetostrictive displacement sensor and a sealed cavity with a sealed chamber. The electronic compartment of the magnetostrictive displacement sensor is fixedly connected to one side of the sealed cavity and sealed thereto. A probe passes through the sealed cavity. A through hole is provided on the side wall of the sealed cavity corresponding to the free end of the probe. The free end of the probe of the magnetostrictive displacement sensor is located in the through hole. A piston rod is fitted onto the free end of the probe and slides with it. The inner end of the piston rod is located in the sealed cavity and is fixedly connected to the magnetic ring seat of the magnetostrictive displacement sensor. A magnetic ring is fixedly installed in the magnetic ring seat and is fitted onto the probe and slides along the probe with the magnetic ring seat. The middle part of the piston rod slides with the inner wall of the through hole and the two are sealed together. The outer end of the piston rod is a linkage part for contacting or connecting to the moving body to be measured. A linear spring is provided in the sealed cavity, coaxial with the probe. One end of the linear spring abuts against the magnetic ring seat, and the other end of the linear spring is fixed.

2. The self-resetting mechanical magnetostrictive displacement sensor according to claim 1, characterized in that: A linear spring is a compression spring and is in a compressed state.

3. The self-resetting mechanical magnetostrictive displacement sensor according to claim 1, characterized in that: The linear spring is a return spring.

4. The self-resetting mechanical magnetostrictive displacement sensor according to claim 1, characterized in that: A linear bearing and several O-rings are provided between the through hole and the piston rod. The linear bearing is interference-fitted with the through hole, and the O-rings are embedded in the inner wall of the through hole and abut against the piston rod.

5. The self-resetting mechanical magnetostrictive displacement sensor according to claim 4, characterized in that: A linear bearing is installed between the magnetic ring seat and the measuring rod, and the linear bearing is fixedly installed inside the magnetic ring seat.

6. The self-recovering mechanical magnetostrictive displacement sensor according to claim 5, characterized in that: A magnetic shielding pad is placed between the linear bearing and the magnetic ring.

7. The self-resetting mechanical magnetostrictive displacement sensor according to claim 1, characterized in that: The sealed cavity includes a fixed sleeve and a fixed flange. One end face of the fixed flange is fixedly connected to the electronic compartment and sealed, while the other end of the fixed flange is open. One end of the fixed sleeve is open, and the other end of the fixed sleeve is provided with the through hole. The outer wall of the open end of the fixed sleeve is provided with an annular countersunk, which is fitted inside the open end of the fixed flange and is press-fitted and welded to it.

8. The self-resetting mechanical magnetostrictive displacement sensor according to claim 7, characterized in that: An integrated connector is provided on the electronic compartment, and the end of the probe is inserted into the connector. A connecting sleeve is integrated on the fixed flange at the same position as the connector. The connecting sleeve is fitted onto the connector and fits snugly. The end faces of the electronic compartment and the fixed flange are fitted together and bolted. O-rings are provided between the connecting sleeve and the connector, and between the end faces of the electronic compartment and the fixed flange.

9. The self-resetting mechanical magnetostrictive displacement sensor according to claim 1, characterized in that: A wear-resistant ball head is snapped into the outer end of the piston rod.

10. The self-resetting mechanical magnetostrictive displacement sensor according to claim 1, characterized in that: The piston rod, the sealed cavity, and the outer shell of the electronic compartment are all made of stainless steel.

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