Magnetostrictive displacement sensor

Abstract

The utility model discloses a magnetostrictive displacement sensor, which solves the technical problem that the magnetostrictive displacement sensor in the prior art is easy to cause low measurement precision after being damaged in the use process, and comprises a box body, a box cover, a first waveguide tube, a pull rod, a reset spring, a magnetic ring and a sensor body, the box cover is arranged at one end of the box body, and a first through hole is formed in the box cover; the first waveguide tube is arranged in the box body; the pull rod and the first waveguide tube are coaxially arranged, one end of the pull rod is in sliding connection with the first through hole, the other end of the pull rod is connected with a guide plate, the guide plate is located in the box body and provided with a second through hole, and the first waveguide tube is in sliding connection with the second through hole; the reset spring is arranged between the guide plate and the box cover; the magnetic ring is arranged on the guide plate, and the magnetic ring and the second through hole are coaxially arranged; the sensor body is arranged on the box body or the box cover, and the sensor body and the magnetic ring are coaxially arranged. The method can reduce the damage probability of the sensor, and guarantees the measurement precision.

Description

Technical Field

[0001] The present application belongs to the technical field of sensor equipment, and specifically relates to a magnetostrictive displacement sensor. Background Art

[0002] In automated production, magnetostrictive displacement sensors are key components for controlling the motion stroke of equipment and facilities. In most cases, magnetostrictive displacement sensors are usually fixed to the moving and stationary parts of the equipment and facilities through metal brackets. The magnetostrictive displacement sensor body and magnetic ring are respectively fixed to the moving and stationary parts of the equipment and facilities, so that the magnetic ring and the magnetostrictive displacement sensor sensing rod move axially. However, during on-site use, the moving and stationary parts of the equipment and facilities may have certain non-axial displacements due to various factors, which can easily cause damage to the magnetostrictive displacement sensor and the magnetic ring, thereby reducing the measurement accuracy of the magnetostrictive displacement sensor and affecting production operations. Summary of the Invention

[0003] In order to solve the technical problem that the current magnetostrictive displacement sensor is prone to low measurement accuracy after being damaged during use, the present application provides a magnetostrictive displacement sensor.

[0004] In a first aspect of the present application, a magnetostrictive displacement sensor is provided, comprising: a housing; a housing cover, arranged at one end of the housing, the housing cover being provided with a first through hole; a first waveguide tube, arranged in the housing; a pull rod, coaxially arranged with the first waveguide tube, one end of the pull rod being slidably connected to the first through hole, the other end of the pull rod being connected to a guide plate, the guide plate being located in the housing, the guide plate being provided with a second through hole, the first waveguide tube being slidably connected to the second through hole; a reset spring, arranged between the guide plate and the housing cover; a magnetic ring, arranged on the guide plate, and the magnetic ring and the second through hole being coaxially arranged; a sensor body, arranged in the housing or the housing cover, the sensor body being coaxially arranged with the magnetic ring.

[0005] In some embodiments, a first sliding sleeve is sleeved on the pull rod, one end of the first sliding sleeve is fixedly connected to the box cover, and the sensor body and the magnetic ring are coaxially arranged.

[0006] In some embodiments, a second sliding sleeve is fixedly provided on the guide plate, the second sliding sleeve is sleeved on the first waveguide tube, and the second sliding sleeve is coaxially provided with the first waveguide tube.

[0007] In some embodiments, a guide rod is further provided in the box, the axis of the guide rod is parallel to the axis of the first waveguide tube, the guide plate is provided with a third through hole, and the guide rod is slidably connected to the third through hole.

[0008] In some embodiments, a third sliding sleeve is fixedly provided on the guide plate, the third sliding sleeve is sleeved on the guide rod, and the third sliding sleeve is coaxially arranged with the guide rod.

[0009] In some embodiments, the guide rod is a waveguide tube, and the magnetostrictive displacement sensor includes two sensor bodies and two magnetic rings, another magnetic ring is arranged on the guide plate and is coaxial with the third through hole, and the other sensor body is arranged on the box body or the box cover and is coaxial with the other magnetic ring.

[0010] In some embodiments, the first waveguide tube and the guide rod are relatively arranged on both sides of the pull rod, and the axis of the pull rod, the axis of the first waveguide tube, and the axis of the guide rod are located in the same plane.

[0011] In some embodiments, a locking buckle is further provided on the pull rod.

[0012] In some embodiments, the return spring is sleeved on the pull rod.

[0013] In some embodiments, the sensor body is disposed on the box cover.

[0014] According to the magnetostrictive displacement sensor provided in one or more embodiments of the present application, the sliding cooperation between the pull rod and the first through hole makes it difficult for the pull rod to produce non-axial displacement of the pull rod, that is, the cooperation between the pull rod and the first through hole makes the magnetic ring on the guide plate only move along the axial direction of the pull rod, and the axial direction of the pull rod is parallel to the first waveguide tube; the magnetic ring and the first waveguide tube arranged in the box body only move relative to each other in the axial direction of the first waveguide tube. By providing the box body, the first waveguide tube and the magnetic ring in the box body are protected by the box body during use, and are not easily damaged by external forces. They can maintain a good condition and high precision during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of a magnetostrictive displacement sensor in one or more embodiments of the present application is shown.

[0016] Figure 2 A schematic structural diagram of a portion of a magnetostrictive displacement sensor in one or more embodiments of the present application is shown.

[0017] Figure 3 Shown Figure 2 Schematic diagram of the cross-sectional structure.

[0018] Explanation of the reference numerals: 101 - box cover, 102 - box body, 201 - pull rod, 202 - guide rod, 203 - first sliding sleeve, 204 - third sliding sleeve, 205 - second sliding sleeve, 206 - guide plate, 207 - locking buckle, 208 - return spring, 209 - first waveguide tube, 301 - sensor body, 302 - magnetic ring. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to understand the present application more clearly, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of this application.

[0020] See also Figure 1-3 In a first embodiment of the present application, a magnetostrictive displacement sensor is provided, comprising a housing 102, a housing cover 101, a first waveguide tube 209, a pull rod 201, a return spring 208, a magnetic ring 302, and a sensor body 301. The sensor body 301 and the magnetic ring 302 are coaxially arranged. A waveguide wire connected to the sensor body 301 is disposed within the first waveguide tube 209. The magnetic ring 302 and the electronic chamber within the sensor body 301 cooperate with each other. A current pulse is generated within the electronic chamber, which is transmitted within the waveguide tube, thereby generating a circumferential magnetic field outside the waveguide tube. When this magnetic field intersects with the magnetic field generated by a movable magnetic ring 302, which is positioned so as to change position within the waveguide tube, a strain mechanical wave pulse signal is generated within the waveguide tube due to magnetostriction. This strain mechanical wave pulse signal is transmitted at a constant speed of sound and is quickly detected by the electronic chamber. The transmission time of the strain mechanical wave pulse signal within the waveguide tube is proportional to the distance between the movable magnetic ring 302 and the electronic chamber. By measuring this time, this distance can be determined with high precision.

[0021] The box cover 101 is arranged at one end of the box body 102. The box body 102 and the box cover 101 can together form a sealed box body 102. The box body 102 and the box cover 101 can be opened and closed by snapping or connecting them together by bolts. The box cover 101 is provided with a first through hole; the first waveguide tube 209 is arranged in the box body 102.

[0022] The pull rod 201 is coaxially arranged with the first waveguide tube 209. One end of the pull rod 201 is slidably connected to the first through hole. The other end of the pull rod 201 is connected to the guide plate 206. The guide plate 206 is located in the box body 102. The guide plate 206 is provided with a second through hole. The first waveguide tube 209 is slidably connected to the second through hole.

[0023] The return spring 208 is arranged between the guide plate 206 and the box cover 101. When the pull rod 201 is no longer subjected to external force, the return spring 208 returns to its natural state and drives the pull rod 201 to move to its initial state, so that the measuring range of the entire magnetostrictive displacement sensor remains unchanged.

[0024] The magnetic ring 302 is disposed on the guide plate 206 and is coaxial with the second through hole. The sensor body 301 is disposed on the box body 102 or the box cover 101 and is coaxial with the magnetic ring 302 .

[0025] The pull rod 201 is in sliding cooperation with the first through hole, and the first through hole will limit the moving direction of the pull rod 201, so that the pull rod 201 is not prone to non-axial displacement of the pull rod 201, that is, the cooperation between the pull rod 201 and the first through hole makes the magnetic ring 302 on the guide plate 206 only move along the axial direction of the pull rod 201, and the axial direction of the pull rod 201 is parallel to the first waveguide tube 209. It can be understood that the magnetic ring 302 and the first waveguide tube 209 arranged in the box body 102 only move relative to each other in the axial direction of the first waveguide tube 209. By setting up the box body 102, the first waveguide tube 209 and the magnetic ring 302 in the box body 102 are protected by the box body 102 during use, and are not easily damaged by external forces. They can maintain a good condition and high precision during long-term use.

[0026] In some embodiments, a first sleeve 203 is sleeved on the pull rod 201, one end of the first sleeve 203 is fixedly connected to the box cover 101, and the first sleeve 203 is coaxially arranged with the pull rod 201. The first sleeve 203 has a through hole for sleeved on the pull rod 201. By adding the first sleeve 203, the limiting ability of the pull rod 201 is improved, and the non-axial movement of the pull rod 201 is further reduced. By increasing the length of the first sleeve 203, the limiting ability of the first sleeve 203 on the pull rod 201 is improved, and the thickness of the box cover 101 can be set to be thinner, thereby reducing the weight of the entire magnetostrictive displacement sensor and facilitating installation by operators. In other embodiments, the inner diameter of the through hole of the first sleeve 203 is equal to the outer diameter of the pull rod 201, so as to maximize the limiting ability of the first sleeve 203 on the pull rod 201.

[0027] The guide plate 206 is a plate-shaped member, and accordingly, the wall area of the second through hole is relatively small. Therefore, in certain embodiments, a second sleeve 205 is fixedly mounted on the guide plate 206. The second sleeve 205 is sleeved onto the first waveguide 209, and the second sleeve 205 is coaxially arranged with the first waveguide 209. The second sleeve 205 has a through hole for sleeved onto the first waveguide 209. By fixing the second sleeve 205 to the guide plate 206, the stability of the guide plate 206 during movement is increased, thereby improving measurement accuracy.

[0028] In some embodiments, a guide rod 202 is further provided in the box 102 , the axis of the guide rod 202 is parallel to the axis of the first waveguide tube 209 , the guide plate 206 is provided with a third through hole, and the guide rod 202 is slidably connected to the third through hole.

[0029] It can be understood that the sliding fit between the guide rod 202 and the third through hole further restricts the movement of the guide plate 206, thereby further weakening the possible non-axial movement of the pull rod 201 during the movement process, protecting the magnetic ring 302 and the first waveguide tube 209, and ensuring that the magnetostrictive displacement sensor can maintain high precision during long-term use.

[0030] In certain embodiments, a third sleeve 204 is fixedly mounted on the guide plate 206. The third sleeve 204 is sleeved onto the guide rod 202 and is coaxially disposed with the guide rod 202. The third sleeve 204 has a through hole for sleeved onto the guide rod 202. By fixing the third sleeve 204 to the guide plate 206, the stability of the guide plate 206 during movement is increased, thereby improving measurement accuracy.

[0031] In some embodiments, the guide rod 202 is a waveguide tube, and the magnetostrictive displacement sensor includes two sensor bodies 301 and two magnetic rings 302. Another magnetic ring 302 is arranged on the guide plate 206 and is coaxial with the third through hole. The other sensor body 301 is arranged on the box body 102 or the box cover 101 and is coaxial with the other magnetic ring 302.

[0032] As can be understood, the two sets of sensor bodies 301 and their corresponding magnetic rings 302 provided in this application enable operators to obtain two sets of movement data after the pull rod 201 moves. If the two sets of movement data are consistent or the difference is within a small range, the average of the two sets of movement data can be taken as the final measurement data. If the two sets of movement data are inconsistent and the difference between the two sets of movement data is large, the data measured by the current magnetostrictive displacement sensor is considered inaccurate, and the operator needs to inspect which sensor body 301 or magnetic ring 302 is damaged. It can also be understood that the operator can quickly determine whether the data obtained by the magnetostrictive displacement sensor is usable. In other words, by providing two sets of sensor bodies 301, corresponding magnetic rings 302, and waveguides, the accuracy of the magnetostrictive displacement sensor can be further improved.

[0033] In some embodiments, the first waveguide tube 209 and the guide rod 202 are relatively arranged on both sides of the pull rod 201, and the axis of the pull rod 201, the axis of the first waveguide tube 209 and the axis of the guide rod 202 are located in the same plane.

[0034] It can be understood that the pull rod 201 is located between the first waveguide tube 209 and the guide rod 202. Then, when the guide plate 206 fixedly connected to the pull rod 201 contacts the first waveguide tube 209 or the guide rod 202 during movement, the direction of the force exerted by the first waveguide tube 209 on the guide plate 206 is opposite to the direction of the force exerted by the guide rod 202 on the guide rod 202. The pull rod 201 is not prone to non-axial movement, which is conducive to maintaining the relative position between the pull rod 201, the first waveguide tube 209 and the guide rod 202 unchanged.

[0035] In some embodiments, the pull rod 201 is further provided with a locking buckle 207. The locking buckle 207 is located outside the box cover 101 and is operably fixedly connected to the pull rod 201. By adjusting the position of the locking buckle 207 on the pull rod 201, the length of the portion of the pull rod 201 inside the box body 102 can be limited, thereby achieving adjustment of the range of the magnetostrictive displacement sensor.

[0036] In some embodiments, a return spring 208 is sleeved on the pull rod 201. One end of the spring is fixedly connected to the box cover 101, and the other end of the spring is fixedly connected to the guide plate 206. The spring and the pull rod 201 are coaxial. In this case, the stress of the spring on the guide plate 206 is concentrated at the connection between the guide plate 206 and the pull rod 201. The guide plate 206 is not easily lost due to the elastic force of the return spring 208, resulting in a change in the relative position between the guide plate 206 and the pull rod 201. This reduces the probability of damage to the magnetostrictive displacement sensor and ensures measurement accuracy.

[0037] In some embodiments, the sensor body 301 is disposed on the box cover 101 , which facilitates separation of the box cover 101 and the box body 102 , and further facilitates operators to inspect and repair the magnetostrictive displacement sensor.

[0038] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In this application, unless otherwise specified or limited, the terms "connect," "fix," etc. should be understood broadly. For example, "fix" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0042] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A magnetostrictive displacement sensor, characterized in that: include: Box; A box cover is provided at one end of the box body, and the box cover is provided with a first through hole; a first waveguide, disposed in the box; A pull rod is coaxially arranged with the first waveguide tube, one end of the pull rod is slidably connected to the first through hole, the other end of the pull rod is connected to a guide plate, the guide plate is located in the box, the guide plate is provided with a second through hole, and the first waveguide tube is slidably connected to the second through hole; A return spring is provided between the guide plate and the box cover; a magnetic ring, disposed on the guide plate, and the magnetic ring and the second through hole are coaxially arranged; The sensor body is arranged on the box body or the box cover, and the sensor body and the magnetic ring are coaxially arranged.

2. The magnetostrictive displacement sensor according to claim 1, characterized in that: A first sliding sleeve is sleeved on the pull rod, one end of the first sliding sleeve is fixedly connected to the box cover, and the first sliding sleeve is coaxially arranged with the pull rod.

3. The magnetostrictive displacement sensor according to claim 1, wherein: A second sliding sleeve is fixedly provided on the guide plate, the second sliding sleeve is sleeved on the first waveguide tube, and the second sliding sleeve is coaxially provided with the first waveguide tube.

4. The magnetostrictive displacement sensor according to claim 1, wherein: A guide rod is further provided in the box body, the axis of the guide rod is parallel to the axis of the first waveguide tube, the guide plate is provided with a third through hole, and the guide rod is slidably connected to the third through hole.

5. The magnetostrictive displacement sensor according to claim 4, characterized in that: A third sliding sleeve is fixedly provided on the guide plate, the third sliding sleeve is sleeved on the guide rod, and the third sliding sleeve and the guide rod are coaxially provided.

6. The magnetostrictive displacement sensor according to claim 5, characterized in that: The guide rod is a waveguide tube, and the magnetostrictive displacement sensor includes two sensor bodies and two magnetic rings, another magnetic ring is arranged on the guide plate and is coaxial with the third through hole, and the other sensor body is arranged on the box body or the box cover and is coaxial with the other magnetic ring.

7. The magnetostrictive displacement sensor according to claim 5, characterized in that: The first waveguide tube and the guide rod are relatively arranged on both sides of the pull rod, and the axis of the pull rod, the axis of the first waveguide tube and the axis of the guide rod are located in the same plane.

8. The magnetostrictive displacement sensor according to claim 1, wherein: The pull rod is also provided with a locking buckle.

9. The magnetostrictive displacement sensor according to any one of claims 1 to 8, characterized in that: The return spring is sleeved on the pull rod.

10. The magnetostrictive displacement sensor according to any one of claims 1 to 8, characterized in that: The sensor body is arranged on the box cover.

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