Self-guiding closed linear displacement sensor structure

Abstract

This invention discloses a self-guided enclosed linear displacement sensor structure. The left and right frames of the fixed-scale component are fastened together to form a fixed-scale housing; front and rear end caps are installed at both ends of the fixed-scale housing; the fixed-scale electrode is installed in the left frame. A step is provided in the left frame, and a guide strip parallel to the fixed-scale electrode is installed on the step. The upper end of the reading head's slide is connected to the upper end of the movable scale support to form an inverted U-shaped frame; the U-shaped frame is located in the inner cavity of the fixed-scale housing and covers the guide strip, with the inner side of the slide in contact with the guide strip; the movable scale electrode is attached to the outer side of the movable scale support. The lower surface of the reading head's sliding block extends downward to form a connecting plate, the lower end of which extends into the fixed-scale housing; an elastic element is provided between the lower end of the connecting plate and the slide, ensuring that the slide remains in contact with the guide strip. The reading head of this invention is self-guided, and the relative motion trajectory between the reading head and the fixed scale is parallel to the trajectory of the measured motion.

Description

Technical Field

[0001] This invention relates to an improvement in the structure of a displacement sensor, specifically to a self-guided, enclosed linear displacement sensor structure, belonging to the field of displacement detection technology. Background Technology

[0002] Currently, with the increasing level of industrial automation, the application market for linear displacement sensors is expanding. Simultaneously, the requirements for their environmental adaptability and performance are also becoming increasingly stringent. A linear displacement sensor mainly consists of a fixed-length section and a reading head. It primarily measures displacement by converting the linear displacement of the moving part relative to a fixed part into the linear displacement of the reading head relative to the fixed-length housing. Linear displacement sensors are mainly divided into two categories: enclosed and open. Enclosed linear displacement sensors have stronger resistance to oil, chips, and cutting fluid, and their application range is wider. Existing enclosed linear displacement sensors have relatively complex structures, and ensuring that the relative motion trajectory between the reading head and the fixed-length is parallel to the trajectory of the measured motion remains a significant challenge. Summary of the Invention

[0003] To address the shortcomings of existing technologies where the relative motion trajectory between the reading head and the fixed ruler is difficult to parallel with the trajectory of the measured motion, the purpose of this invention is to provide a self-guided enclosed linear displacement sensor structure that makes the relative motion trajectory between the reading head and the fixed ruler parallel to the trajectory of the measured motion.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A self-guided enclosed linear displacement sensor structure includes a fixed-scale component, a reading head, a motion cable, and a signal cable. The fixed-scale component includes a fixed-scale electrode, a left frame, a right frame, a front cover, a rear cover, and sealing strips. The left and right frames are C-shaped and interlocked to form a fixed-scale housing with an inner cavity that is open at both ends and the top. The front and rear covers are installed at both ends of the fixed-scale housing to close the two ends of the inner cavity. A first positioning step extending along the length of the left frame is provided inside the left frame, and the fixed-scale electrode is installed inside the left frame through the first positioning step, with the working surface of the fixed-scale electrode facing the right frame. Two sealing strips are installed on the upper ends of the left and right frames respectively through slots, and the two sealing strips overlap to close the top of the inner cavity. The characteristic feature is that a second positioning step extending along the length of the left frame is provided inside the left frame, and a guide strip is installed on the second positioning step, the guide strip being parallel to the fixed-scale electrode. The guide strip protrudes upward from the second positioning step by a certain height.

[0006] The reading head includes a movable scale electrode, a slide, a movable scale support, a sliding block, a signal circuit, and a cover plate; the slide and the movable scale support are parallel and opposite plates, and the upper end of the slide is connected to the upper end of the movable scale support to form an inverted U-shaped frame; the U-shaped frame is located in the inner cavity of the fixed scale housing and covers the guide strip, and the inner side of the slide is in contact with the guide strip; the movable scale electrode is attached to the outer side of the movable scale support;

[0007] The upper surface of the sliding block has a cavity, and the signal processing circuit is placed inside the cavity and sealed by a cover plate; the middle of the lower surface of the sliding block extends downward to form a connecting plate along the length direction, and the lower end of the connecting plate passes through the movable overlap between the two sealing strips and extends into the inner cavity of the fixed-length housing; an elastic element is provided between the lower end of the connecting plate and the carriage, and the elastic element acts on the outer side of the carriage to keep the carriage always in contact with the guide strip;

[0008] One end of the motion cable is welded to the fixed-length electrode through the front / rear end caps of the fixed-length component, and the other end is welded to the signal processing circuit through the reading head wire seat at the end of the sliding block; one end of the signal cable is welded to the signal processing circuit, and the other end extends from the reading head wire seat and is connected to the driver.

[0009] Preferably, the main body of the elastic element is a steel wire, one end of which is fixed to the connecting plate, and the other end of which is provided with a ball. By bending the steel wire, the steel wire is made to have elasticity, and this elasticity makes the ball always elastically act on the outer side of the carriage.

[0010] More preferably, a sleeve is formed protruding outward at the middle position of the outer side of the carriage, the length of the sleeve is less than the diameter of the ball; the inner diameter of the sleeve is greater than the diameter of the ball; the ball is located in the sleeve to achieve an elastic effect on the outer side of the carriage.

[0011] Furthermore, the bottom of the connecting plate is provided with downward-facing feet at both ends, and the steel wire is fixedly connected to the feet of the connecting plate by screws.

[0012] Preferably, multiple lateral bearings are provided on the side of the carriage facing the guide bar, and the carriage contacts the corresponding surface of the guide bar through the multiple lateral bearings.

[0013] There are three lateral bearings, arranged in an isosceles triangle.

[0014] Preferably, the upper ends of the slide extend towards the movable ruler support on both sides to form two connecting parts. Connecting lugs are provided on the upper sides of the movable ruler support, and the connecting parts and connecting lugs are fixedly connected accordingly. An end face bearing is provided on each of the two connecting parts of the slide. The end face bearings on the two connecting parts are located on the same straight line, and the end face bearings on the two connecting parts are in contact with the upper end face of the guide bar.

[0015] The guide strip is a glass guide strip.

[0016] The two sealing strips are installed at an angle after being installed in the upper slots of the left and right frames. The two angled sealing strips overlap to form a herringbone shape.

[0017] The front and rear covers are mirror-symmetrically installed at both ends of the fixed-length housing to accommodate wires exiting from the fixed-length electrode in different directions, thereby improving the flexibility of wire exit.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. This invention incorporates a glass guide strip within the fixed-length component. The slide and the movable-length support are suspended on either side of the guide strip. The inner surface of the slide (the surface opposite the movable-length support, referred to as the inner surface because it is located inside the U-shaped frame) adheres to the glass guide strip to control the distance between the movable-length electrode and the fixed-length electrode. Simultaneously, it constrains the sway of the movable-length relative to the fixed-length along the length of the fixed-length component, ensuring that the fixed and movable-length components remain parallel. Utilizing the flatness of the glass strip for guidance not only reduces the processing requirements and assembly difficulty of the workpiece but also decreases the coefficient of friction during movement, thus reducing wear and tear on components caused by friction.

[0020] 2. By setting an elastic element, a corresponding tensile or thrust force will be generated during operation to drive the slide and the movable scale support to move accordingly. At the same time, the elastic element can also adaptively help adjust the posture of the reading head so that the movable scale plate always remains parallel to the fixed scale plate, which can reduce installation requirements and reduce vibration during the movement process.

[0021] 3. Three sliding bearings are installed in the X direction of the carriage and two bearings are installed in the Z direction. Under the action of the elastic element, the carriage slides in close contact with the two surfaces of the glass guide strip through the bearings, which greatly reduces the friction between the two.

[0022] 4. The front and rear end covers of the fixed-length component of this invention are symmetrically arranged, and the cable outlet ports are symmetrically adjustable on the left and right, so that both the left and right sides can be used as cable outlet ports, making the use more flexible. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the self-guided enclosed linear displacement sensor of the present invention;

[0024] Figure 2 This is an exploded structural diagram of the self-guided enclosed linear displacement sensor of the present invention.

[0025] Figure 3 This is an exploded structural diagram of the length-fixing component of the self-guided enclosed linear displacement sensor of the present invention.

[0026] Figure 4 This is an exploded view of the reading head of the self-guided enclosed linear displacement sensor of the present invention.

[0027] Figure 5 This is a side view of some components of the self-guided enclosed linear displacement sensor of the present invention.

[0028] Figure 6 This diagram shows the installation position relationship between the U-shaped frame formed by the slide and the movable ruler support and the guide bar in the self-guided enclosed linear displacement sensor of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] See Figure 1 and Figure 2 The present invention discloses a self-guided enclosed linear displacement sensor structure, including a fixed-length component 1, a reading head 2, a slider 3 for assisting installation and transportation (not used during operation), a motion cable 4, and a signal cable 5.

[0031] See Figure 3 The length-fixing component of this invention mainly consists of a length-fixing electrode 1-1, a left frame 1-2, a right frame 1-3, a front cover 1-4, a rear cover 1-5, a guide strip 1-6, and a sealing strip 1-7. The left frame 1-2 and right frame 1-3 are C-shaped and interlocked to form a length-fixing housing with an inner cavity that is open at both ends and the top. The front cover 1-4 and rear cover 1-5 are installed at both ends of the length-fixing housing to close the inner cavity. The front cover and rear cover are mirror-symmetrically installed at both ends of the length-fixing housing to accommodate wire exiting in different directions from the length-fixing electrode, improving the flexibility of wire exit.

[0032] A first positioning step extending along the length of the left frame is provided on the inner side of the left frame 1-2. The fixed-length electrode 1-1 is installed inside the left frame 1-2 through the first positioning step, with the working surface of the fixed-length electrode facing the right frame. Two sealing strips 1-7 are installed on the upper ends of the left frame 1-2 and the right frame 1-3 respectively through slots, and the two sealing strips 1-7 overlap to seal the upper part of the inner cavity. A second positioning step extending along the length of the left frame is provided inside the left frame. A guide strip 1-6 is installed on the second positioning step, parallel to the fixed-length electrode 1-1; the guide strip protrudes upward from the second positioning step by a certain height. The main function of the guide strip is to provide guidance, support, and positioning for the reading head. Preferably, the guide strip is a glass guide strip, which has better flatness and better guiding effect.

[0033] See Figure 4 The reading head is a trolley structure that slides using rolling bearings. The reading head 2 mainly consists of a movable scale electrode 2-1, a slide 2-2, a movable scale support 2-3, a sliding block 2-4, a signal processing circuit 2-5, a cover plate 2-6, and an elastic element 2-7. The slide 2-2 and the movable scale support 2-3 are parallel, opposite plates. The upper end of the slide 2-2 is connected to the upper end of the movable scale support 2-3 by screws to form an inverted U-shaped frame. The U-shaped frame is located inside the fixed scale housing and covers the guide strip 1-6. The inner side of the slide 2-2 is in contact with the guide strip 1-6. The movable scale electrode 2-1 is attached to the outer side of the movable scale support 2-3. The upper surface of the sliding block 2-4 has a cavity, and the signal processing circuit 2-5 is placed inside the cavity and sealed by the cover plate 2-6. The lower surface of the sliding block 2-4 extends downwards from the middle to form a connecting plate 2-8 along its length. The lower end of the connecting plate 2-8 passes through the movable overlap between the two sealing strips and extends into the inner cavity of the fixed-length housing. An elastic element 2-7 is provided between the lower end of the connecting plate 2-8 and the slide 2-2. The elastic element 2-7 acts on the outer side of the slide 2-2 to ensure that the slide 2-2 is always in contact with the guide strip 1-6. The relationship between the reading head and the fixed-length component can be seen in [reference needed]. Figure 5 .

[0034] Two sliders 3 are mounted on both ends of the reading head 2 with screws. Guide grooves (slider grooves) are provided on the upper part of the left and right frames. The lower parts of the two sliders are installed in the guide grooves of the left and right frames at the same time so that they can reciprocate relative to the fixed length component.

[0035] One end of the motion cable 4 is welded to the fixed-length electrode 1-1 through the front / rear end caps of the fixed-length component, and the other end is welded to the signal processing circuit 2-5 through the reading head wire seat at the end of the sliding block; one end of the signal cable 5 is welded to the signal processing circuit 2-5, and the other end extends from the reading head wire seat and is connected to the driver.

[0036] In this embodiment, the main body of the elastic element 2-7 is a steel wire. One end of the steel wire is fixed to the connecting plate 2-8, and the other end of the steel wire is provided with a ball 2-9. By bending the steel wire, the steel wire has elasticity, and this elasticity makes the ball 2-9 always elastically act on the outer side of the slide 2-2.

[0037] For ease of installation, the bottom ends of the connecting plate 2-8 are provided with downward-facing support feet 2-10. The steel wire is fixedly connected to the support feet of the connecting plate by screws. During connection, to ensure a firm connection, the end of the steel wire is bent back 180° and wrapped around the screw, and the screw head presses the bent part tightly against the support foot.

[0038] To better improve the force transmission, this invention features a sleeve 2-2-1 protruding outward from the middle of the outer side of the slide 2-2. The sleeve's length is less than the diameter of the sphere 2-9, while its inner diameter is greater than the sphere's diameter. The sphere 2-9 is located within the sleeve 2-2-1 to provide elastic support to the outer side of the slide. This improvement ensures that the contact between the elastic element and the slide is between the spherical surface and the inner wall and bottom surface of the sleeve, effectively mitigating impacts and vibrations during movement.

[0039] Furthermore, multiple lateral bearings 2-2-2 are provided on the side of the carriage 2-2 opposite to the guide bar, and the carriage 2-2 contacts the corresponding surface of the guide bar 1-6 through the multiple lateral bearings 2-2-2. In this embodiment, there are three lateral bearings, distributed in an isosceles triangle. The upper two bearings and the lower one bearing are located below the sleeve.

[0040] The upper ends of the slide 2-2 are bent towards the movable ruler bracket to form two connecting parts 2-2-3. The movable ruler bracket 2-3 has connecting lugs 2-3-1 on both sides near the upper position. The connecting parts 2-2-3 and the connecting lugs 2-3-1 are fixedly connected. An end face bearing 2-2-4 is provided on each of the two connecting parts 2-2-3 of the slide. The end face bearings on the two connecting parts are located on the same straight line and are in contact with the upper end face of the guide bar.

[0041] Five bearings guide the carriage from two sides, resulting in smoother movement and less friction. The arrangement of the five bearings on the carriage can be found in [reference needed]. Figure 6 .

[0042] The sensor body mainly consists of fixed-scale electrode plates 1-2 and movable-scale electrode plates 2-2. The fixed-scale electrode plates are glued to the mounting surface of the first positioning step on the left frame. The front and rear end caps are screwed to the front and rear ends of the fixed-scale housing formed by the left and right frames. The sealing strip is directly embedded in the T-shaped slots of the left and right frames. The bonding direction of the fixed-scale electrode plates determines the exit direction of the motion cable. The front and rear end caps have a mirror-symmetrical structure, which can adapt to different cable exit directions and improve the flexibility of cable exit. The movable-scale electrode plate is attached to the back of the movable-scale bracket. The signal processing circuit 2-5 is placed in the cavity inside the top of the sliding block. The movable-scale electrode plate and the signal processing circuit are connected by wires soldered together. The wires are hidden inside the sliding block. The cover plate is placed on the top of the sliding block and screwed to seal the signal processing circuit in the top cavity. The signal processing circuit is hidden inside the sliding block and is protected from damage.

[0043] Specific implementation method for measuring displacement:

[0044] During installation and use, the fixed-scale component is mounted onto the fixed component via the left and right frames. Using the edges of the mounting holes on the left and right frames as a reference, its position is adjusted to maintain good parallelism with the direction of movement of the measured moving part. The reading head is mounted onto the measured moving part using the mounting holes on the side of the sliding block. One end of the motion cable is welded to the fixed-scale component via the front / rear end caps, and the other end is welded to the signal processing circuit via the reading head connector. One end of the signal cable is welded to the signal processing circuit, and the other end extends from the reading head connector and connects to the driver. After installation, remove the slider (to ensure installation progress, the slider was previously connected to both ends of the reading head and slidably connected to the guide grooves on the left and right frames, thus maintaining a good positional relationship between the reading head and the fixed-scale component). Under the control of the driver, the measured moving part drives the reading head to move. The signal processing circuit generates an excitation signal and transmits it to the fixed-scale electrode via the motion cable. Based on the time-grating measurement principle, an induced signal is generated between the moving and fixed-scale electrodes due to the coupling effect of the electric field. The signal induced by the moving electrode is transmitted to the signal processing circuit via the signal cable. The induced signal is then processed by the signal processing circuit and converted into linear displacement, which is then fed back to the driver.

[0045] When the object being measured moves the sliding block, a corresponding pulling or pushing force is generated on the elastic element, causing the carriage and the movable scale support to move accordingly. The movement of the carriage causes the five rolling bearings distributed on the carriage to roll tightly against the front and side of the glass guide strip. Utilizing the flatness advantage of the glass strip for guidance not only reduces the processing requirements and assembly difficulty of the workpiece but also reduces the coefficient of friction during movement, thus reducing wear and tear on the components caused by friction. Simultaneously, the elastic element can adaptively help adjust the posture of the reading head. If the reading head wobbles left or right during operation, the elastic element has a self-correcting function, ensuring that the carriage remains parallel to the guide strip. Since the guide strip is parallel to the fixed scale plate, and the movable scale on the movable scale support is parallel to the carriage, the movable scale plate ultimately remains parallel to the fixed scale plate, reducing installation requirements and minimizing vibration during movement.

[0046] The length-fixing component mainly consists of a length-fixing electrode, a left frame, a right frame, a glass guide strip, a sealing strip, and front and rear end caps. The left and right frames are closed to form the length-fixing housing, inside which the length-fixing electrode and the glass guide strip are installed. The main function of the length-fixing component is protection; together with the left and right frames, it forms a protective shell that provides effective shielding and protection for the length-fixing electrode.

[0047] Main features and functions of the left frame:

[0048] 1. Constraining the position of the fixed-length electrode: The inner surface of the left frame has good flatness, which is used to maintain a good parallel relationship with the mounting surface when the fixed-length electrode is pasted. There is a small step surface at the bottom of the inner surface with good straightness, which is used to provide positioning when pasting the fixed-length electrode.

[0049] 2. Positioning of the glass guide strip: A stepped surface is also provided at a certain distance from the inner side of the left frame. The side of this stepped surface has good parallelism with the mounting surface and is used to position and attach the glass guide strip.

[0050] 3. Constraining the position of the right frame: There is a protruding step on the outer edge inside the left frame, which has good flatness and straightness relative to the mounting surface. It is used to provide a reference edge when the left and right frames are closed to constrain the position of the right frame in the Z direction.

[0051] Features of the reading head: The slide and movable scale support are suspended on both sides of the glass guide strip through a stacked combination. Sliding bearings are installed in the X and Z directions of the slide, which can convert the motion of the measured object into the motion of the reading head along the glass guide strip. Due to the excellent levelness of the glass guide strip, the operation of the reading head and its movable scale electrode can maintain good parallelism with the fixed scale electrode.

[0052] Main features and functions of the reading head:

[0053] 1. Constraining the position of the moving scale electrode: When the slide and the moving scale support are stacked together and suspended on both sides of the guide glass strip, the distance between the moving scale electrode and the fixed scale electrode is constrained.

[0054] 2. Adaptive adjustment of the elastic element: The main body of the elastic element is a bent steel wire with a ball welded to one end. There is a hollow sleeve in the middle of the back of the slide. The contact between the elastic element and the slide is the contact between the spherical surface and the inner wall of the sleeve, which can effectively reduce the impact and vibration during movement.

[0055] 3. Three sliding bearings are set in the X direction of the carriage in a triangular distribution, and two bearings are set in the Z direction in a straight distribution. Under the action of the elastic element, the carriage slides in close contact with the two surfaces of the glass guide strip through the bearings, which greatly reduces the friction between the two.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail can be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A self-guided enclosed linear displacement sensor structure, comprising a fixed-length component, a reading head, a motion cable, and a signal cable; the fixed-length component includes a fixed-length electrode, a left frame, a right frame, a front cover, a rear cover, and sealing strips; the left and right frames are C-shaped and interlocked to form a fixed-length housing with an inner cavity and open at both ends and the top; the front and rear covers are installed at both ends of the fixed-length housing to close both ends of the inner cavity; a first positioning step extending along the length of the left frame is provided inside the left frame, and the fixed-length electrode is installed inside the left frame through the first positioning step, with the working surface of the fixed-length electrode facing the right frame; two sealing strips are installed on the upper ends of the left and right frames respectively through slots, and the two sealing strips overlap to close the top of the inner cavity; characterized in that: A second positioning step is provided within the left frame, running along the length of the left frame. A guide strip is installed on the second positioning step, and the guide strip is parallel to the fixed-length electrode. The guide strip protrudes upward from the second positioning step by a certain height. The reading head includes a movable scale electrode, a slide, a movable scale support, a sliding block, a signal circuit, and a cover plate; the slide and the movable scale support are parallel and opposite plates, and the upper end of the slide is connected to the upper end of the movable scale support to form an inverted U-shaped frame; the U-shaped frame is located in the inner cavity of the fixed scale housing and covers the guide strip, and the inner side of the slide is in contact with the guide strip; the movable scale electrode is attached to the outer side of the movable scale support; The upper surface of the sliding block has a cavity, and the signal processing circuit is placed inside the cavity and sealed by a cover plate; the middle of the lower surface of the sliding block extends downward to form a connecting plate along the length direction, and the lower end of the connecting plate passes through the movable overlap between the two sealing strips and extends into the inner cavity of the fixed-length housing; an elastic element is provided between the lower end of the connecting plate and the carriage, and the elastic element acts on the outer side of the carriage to keep the carriage always in contact with the guide strip; One end of the motion cable is welded to the fixed-length electrode through the front / rear end caps of the fixed-length component, and the other end is welded to the signal processing circuit through the reading head wire seat at the end of the sliding block; one end of the signal cable is welded to the signal processing circuit, and the other end extends from the reading head wire seat and is connected to the driver.

2. The self-guiding enclosed linear displacement sensor structure according to claim 1, characterized in that: The main body of the elastic element is a steel wire. One end of the steel wire is fixed to the connecting plate, and the other end of the steel wire is provided with a ball. By bending the steel wire, the steel wire has elasticity, and this elasticity makes the ball always elastically act on the outer side of the carriage.

3. The self-guiding enclosed linear displacement sensor structure according to claim 2, characterized in that: A sleeve protrudes outward from the middle of the outer side of the carriage. The length of the sleeve is less than the diameter of the ball, and the inner diameter of the sleeve is greater than the diameter of the ball. The ball is located in the sleeve to achieve an elastic effect on the outer side of the carriage.

4. The self-guiding enclosed linear displacement sensor structure according to claim 2, characterized in that: The bottom of the connecting plate has downward-facing feet at both ends, and the steel wire is fixedly connected to the feet of the connecting plate by screws.

5. The self-guiding enclosed linear displacement sensor structure according to claim 1, characterized in that: Multiple lateral bearings are installed on the side of the carriage facing the guide bar, and the carriage contacts the corresponding surface of the guide bar through the multiple lateral bearings.

6. The self-guiding enclosed linear displacement sensor structure according to claim 5, characterized in that: There are three lateral bearings, arranged in an isosceles triangle.

7. The self-guiding enclosed linear displacement sensor structure according to claim 1, characterized in that: The upper ends of the slide extend towards the movable ruler bracket to form two connecting parts. Connecting lugs are provided on the upper sides of the movable ruler bracket. The connecting parts and connecting lugs are fixedly connected. An end face bearing is provided on each of the two connecting parts of the slide. The end face bearings on the two connecting parts are located on the same straight line and are in contact with the upper end face of the guide bar.

8. The self-guided enclosed linear displacement sensor structure according to claim 1, characterized in that: The guide strip is a glass guide strip.

9. The self-guiding enclosed linear displacement sensor structure according to claim 1, characterized in that: The two sealing strips are installed at an angle after being installed in the upper slots of the left and right frames. The two angled sealing strips overlap to form a herringbone shape.

10. The self-guided enclosed linear displacement sensor structure according to claim 1, characterized in that: The front and rear covers are mirror-symmetrically installed at both ends of the fixed-length housing to accommodate wires exiting from the fixed-length electrode in different directions, thereby improving the flexibility of wire exit.

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