Magnetic dragging type carbon film linear displacement sensor and installation method

Abstract

The invention relates to the technical field of detection, and relates to a magnetic dragging type carbon film linear displacement sensor and an installation method, and the magnetic dragging type carbon film linear displacement sensor comprises a housing, a pair of magnetic induction structures, an electric brush structure, a pair of first limiting parts, and a pair of second limiting parts. The shell comprises a cylinder and a pair of end covers, and the pair of end covers are oppositely mounted at the two ends of the cylinder; the magnetic induction structures are oppositely arranged on the inner side and the outer side of the cylinder body, the electric brush structure is arranged in the cylinder body and comprises a carbon film plate and an electric brush, one end of the electric brush is in contact with the carbon film plate, and the other end of the electric brush is connected with the magnetic induction structures in the cylinder body; the pair of first limiting parts are oppositely arranged in the barrel, and the magnetic induction structure in the barrel slides between the two first limiting parts; each end cover is provided with a second limiting part, and the second limiting parts are arranged outside the cylinder body; when the magnetic induction structure in the cylinder abuts against the second limiting part, the magnetic induction structure in the cylinder abuts against the first limiting part. The magnetic dragging type carbon film linear displacement sensor provided by the invention has relatively high detection precision.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a magnetically dragged carbon film linear displacement sensor and an installation method thereof. Background Art

[0002] The magnetically dragged carbon film linear displacement sensor is a sensor that uses an outer magnet to drag an inner magnet for synchronous movement. It is mainly used for real-time monitoring of mechanical linear motion data.

[0003] A related document discloses a magnetic-drag carbon film linear displacement sensor, which mainly includes a shell, a carbon film plate, a brush and a pair of magnetic induction structures. The carbon film plate and the brush are placed in the shell, and the pair of magnetic induction structures are arranged on the inner and outer sides of the shell opposite to each other. The brush is connected to the inner magnetic induction structure and contacts with the carbon film plate. When the outer magnetic induction structure moves, it will drag the inner magnetic induction structure to move synchronously, and the brush outputs an electrical signal according to its position on the carbon film plate.

[0004] In order to ensure that the movement of the magnetic sensing structures on the inner and outer sides has a high consistency, the magnetic sensing structure usually includes a mounting block and a plurality of magnets, and the plurality of magnets are assembled to the mounting block to strengthen the magnetic force between the two magnetic sensing structures.

[0005] Regarding the above-mentioned related documents, there are problems of misalignment of the ends of the magnetic sensing structure and low measurement accuracy. Summary of the invention

[0006] The purpose of this application is to provide a magnetic-drag carbon film linear displacement sensor and an installation method that can ensure detection accuracy.

[0007] In the first aspect, the present application provides a magnetic drag type carbon film linear displacement sensor adopts the following technical solution:

[0008] A magnetic drag type carbon film linear displacement sensor, comprising:

[0009] The outer shell comprises a cylinder and a pair of end covers, wherein the pair of end covers are oppositely mounted at two ends of the cylinder;

[0010] A pair of magnetic induction structures are disposed oppositely at the inner and outer sides of the cylinder, the magnetic induction structures are slidably connected to the shell, and include a mounting block and a plurality of magnets disposed in the mounting block, wherein the plurality of magnets are sequentially arranged along the length direction of the cylinder;

[0011] A brush structure is arranged in the cylinder, comprising a carbon film plate and a brush, one end of the brush is in contact with the carbon film plate, and the other end of the brush is connected to the magnetic induction structure in the cylinder;

[0012] A pair of first limiting parts are arranged opposite to each other in the cylinder, and the magnetic induction structure in the cylinder slides between the two first limiting parts;

[0013] A second limiting portion, each of the end covers is provided with the second limiting portion, and the second limiting portion is arranged outside the cylinder;

[0014] When the magnetic induction structure in the cylinder abuts against the second limiting portion, the magnetic induction structure in the cylinder abuts against the first limiting portion.

[0015] Furthermore, a driving structure is arranged outside the housing, and the driving structure comprises:

[0016] A protective shell, which is arranged on the corresponding magnetic induction structure;

[0017] A pull rod, one end of which is connected to the protective shell and the other end of which is connected to a joint;

[0018] The distance between a side of the first limiting portion close to the magnetic induction structure and a side of the second limiting portion close to the magnetic induction structure is equal to the thickness of the protective shell.

[0019] Furthermore, a first slide groove and a pair of second slide grooves arranged opposite to the first slide groove are opened on the outer wall of the cylinder, the mounting block extends into the first slide groove and is tightly attached to the bottom wall of the first slide groove, and the protective shell is connected to a guide portion extending into the second slide groove, and the guide portion is tightly attached to a side of the second slide groove close to the driving structure.

[0020] Furthermore, a pulley is provided on one side of the two mounting blocks that are close to each other, and the mounting blocks are gap-matched with the wall surface of the cylinder through the pulley.

[0021] Furthermore, the mounting block comprises:

[0022] A frame, one end of which is provided with an opening, an inner side wall of the frame is provided with a limiting groove, and the limiting groove is provided along the length direction of the frame;

[0023] A limiting rod, slidably connected in the limiting groove;

[0024] A mounting plate, detachably connected to the frame, closing the opening;

[0025] The limiting rods are arranged between adjacent magnets, and the two side walls of the middle part of the magnets are provided with slots for the limiting rods to extend into.

[0026] Furthermore, a sealing gasket is provided between the end of the shell and the corresponding end cover.

[0027] Furthermore, a sliding core structure is provided in the housing, and the brush is connected to the corresponding magnetic induction structure through the sliding core structure, and the sliding core structure includes:

[0028] A slider, the brush being connected to the bottom of the slider;

[0029] A pair of limit blocks, arranged oppositely on two sides of the sliding block;

[0030] Two groups of third sliding grooves are provided in the shell, and the two groups of third sliding grooves are arranged in one-to-one correspondence with a pair of limiting blocks, and the limiting blocks extend into the corresponding third sliding grooves.

[0031] Furthermore, the sliding core structure is suspended in the housing through a pair of sliding core structures, the width of the third sliding groove is greater than the width of the limit block, one end of the brush is rotatably connected to the bottom of the slider, and the other end of the brush is in contact with the carbon film plate.

[0032] In a second aspect, the present application provides a method for installing a magnetically dragged carbon film linear displacement sensor, comprising the following steps:

[0033] S1. Install an end cover at one end of the cylinder, and install the first limiter and the brush structure in the cylinder in sequence;

[0034] S2, installing a pair of magnetic induction structures on the inner and outer sides of the cylinder, and determining the initial point and the end point of the movement of the magnetic induction structures;

[0035] S3, sliding the magnetic induction structure outside the cylinder to ensure that the magnetic induction structure inside the cylinder moves synchronously with the magnetic induction structure outside the cylinder before it abuts against the second limiting part;

[0036] S4, when the magnetic induction structure inside the cylinder abuts against the second limiting part, whether there is a gap between the magnetic induction structure outside the cylinder and the first limiting part, if there is a gap, adjusting the position of the second limiting part until the magnetic induction structure outside the cylinder abuts against the first limiting part;

[0037] S5. Install the end cover at the other end of the cylinder to complete the final assembly.

[0038] In summary, the present application includes at least one of the following beneficial technical effects:

[0039] 1. In the present application, a first limit portion and a second limit portion are provided to synchronously limit the travel of the magnetic induction structure inside the cylinder and the magnetic induction junction outside the cylinder, so that the moving trajectory of the magnetic induction structure at both ends of the cylinder has a high consistency, thereby ensuring the measurement accuracy of the sensor.

[0040] 2. The mounting block in the present application includes a frame, a mounting plate and a limiting rod, and the limiting rod can better position the magnet, thereby reducing the possibility that the magnet is ejected from the mounting block due to the magnetic repulsion force when there is a magnetic repulsion force between the two magnetic sensing structures;

[0041] At the same time, compared with the traditional method of fixing the magnets with covers on both sides of the frame, the thickness of the magnetic sensing structure can be reduced, so that the two groups of magnets can be closer, thereby strengthening the adsorption force of the outer magnetic sensing structure on the inner magnetic sensing structure.

[0042] 3. The sliding core structure in the present application is suspended. When the outer magnetic induction structure moves, the inner magnetic induction structure can respond better, further reducing the interference of friction, ensuring that the two magnetic induction structures can be more synchronized during movement, and reducing the misalignment between the two magnetic induction structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the three-dimensional structure of the magnetic drag type carbon film linear displacement sensor in the present application;

[0044] Figure 2 It is a schematic cross-sectional view of the magnetic drag type carbon film linear displacement sensor in the present application;

[0045] Figure 3 It is a schematic diagram of the exploded structure of the magnetic sensing structure in this application;

[0046] Figure 4 It is a three-dimensional structural schematic diagram of the magnetic induction structure and the sliding core structure in this application.

[0047] In the figure, 1, shell; 11, cylinder; 111, first slide groove; 112, second slide groove; 113, third slide groove; 12, end cover; 2, magnetic induction structure; 21, mounting block; 211, frame; 2111, opening; 2112, limit groove; 212, limit rod; 213, mounting plate; 22, magnet; 221, slot; 3, brush structure; 31, carbon film plate; 32, brush; 4, first limit part; 5, second limit part; 6, driving structure; 61, protective shell; 62, pull rod; 63, joint; 64, guide part; 7, pulley; 8, sealing gasket; 9, sliding core structure; 91, slider; 92, limit block. DETAILED DESCRIPTION

[0048] The following will be combined with the attached Figure 1-4 The technical solution of the present application is described clearly and completely. The following embodiments are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application. In the following description, the same symbols are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0049] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They 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.

[0050] In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] It should be further understood that the term “and / or” used in the specification and corresponding claims of this application refers to any and all possible combinations of one or more of the listed items.

[0052] A magnetic drag type carbon film linear displacement sensor, referring to Figure 1 and Figure 2 , including a housing 1, a brush structure 3 and a pair of magnetic induction structures 2, the brush structure 3 is arranged in the housing 1, and the pair of magnetic induction structures 2 are arranged oppositely at the inner and outer sides of the housing 1, and are both slidably connected to the housing 1. The brush structure 3 includes a carbon film plate 31 and a brush 32, the carbon film plate 31 is fixed in the housing 1, one end of the brush 32 is in contact with the carbon film plate 31, and the other end of the brush 32 is connected to the magnetic induction structure 2 in the cylinder 11.

[0053] When the magnetic induction structure 2 outside the shell 1 moves, under the action of magnetic force, the magnetic induction structure 2 inside the shell 1 moves synchronously and drives the brush 32 to move on the carbon film plate 31, thereby achieving the purpose of detecting displacement. This detection method makes the shell 1 have higher strength, and the displacement sensor has strong waterproof performance and can better adapt to humid working environment.

[0054] Correspondingly, refer to Figure 1 and Figure 2 The housing 1 includes a cylinder 11 and a pair of end covers 12. When assembling the displacement sensor, the brush structure 3 and a magnetic induction structure 2 are first placed in the cylinder 11, and then the pair of end covers 12 are installed at both ends of the cylinder 11 opposite to each other.

[0055] Furthermore, a sealing gasket 8 is provided between the end of the housing 1 and the corresponding end cover 12. The sealing gasket 8 can effectively improve the sealing between the housing 1 and the end cover 12, and further improve the waterproof performance of the displacement sensor.

[0056] In a specific embodiment, the housing 1 is made of aluminum, which can ensure its own strength without interfering with the magnetic sensing structure 2. In another specific embodiment, the housing 1 can also be made of other non-magnetic metals to ensure that the two magnetic sensing structures 2 can work stably.

[0057] Furthermore, a driving structure 6 is disposed outside the housing 1, and the driving structure 6 is connected to the magnetic sensing structure 2 outside the housing 1 to drive the magnetic sensing structure 2 to move. When the displacement of the object to be measured needs to be measured, the object to be measured can be connected to the driving structure 6.

[0058] Specifically, refer to Figure 1 and Figure 2 The driving structure 6 includes a protective shell 61 and a pull rod 62. The protective shell 61 is covered on the corresponding magnetic induction structure 2. One end of the pull rod 62 is connected to the protective shell 61, and the other end of the pull rod 62 is connected to a joint 63.

[0059] In a specific embodiment, the connector 63 is an internal fisheye connector 63, which is connected to the object to be tested by crimping, making the connection between the object to be tested and the driving structure 6 easier. At the same time, the internal fisheye connector 63 can better adapt to harsh environments such as humidity and dust.

[0060] Further, refer to Figure 2 and Figure 3 The magnetic sensing structure 2 includes a mounting block 21 and a plurality of magnets 22 disposed in the mounting block 21, and the plurality of magnets 22 are sequentially arranged along the length direction of the housing 1. The plurality of magnets 22 outside the housing 1 correspond to the plurality of magnets 22 inside the housing 1 in a one-to-one manner and have opposite magnetic poles.

[0061] By providing a plurality of magnets 22 , the adsorption force between the two magnetic sensing structures 2 is strengthened to ensure the consistency of the movement of the two magnetic sensing structures 2 .

[0062] In a specific embodiment, the number of magnets 22 is set to 4, and the magnets 22 are strong permanent magnets 22, and the magnetic pole faces of the magnets 22 are located in the same plane. Among them, the magnetic poles at one end of the multiple magnets 22 outside the housing 1 are arranged in the order of S1N2S3N4. During installation, the multiple magnets 22 are pressed into the mounting block 21 in sequence to complete the fixing of the magnets 22.

[0063] However, in actual working process, there is misalignment between the two magnetic sensing structures 2, and even repulsion occurs.

[0064] Specifically, taking the above arrangement of the magnets 22 as an example, since the travel of the magnetic sensing structure 2 in the housing 1 is short, when the magnetic sensing structure 2 in the housing 1 abuts against the inner wall of the housing 1 and does not move any more, if the magnetic sensing structure 2 outside the housing 1 still slides, the two magnetic sensing structures 2 will be misaligned, which will cause a large deviation between the measured value of the sensor and the actual value.

[0065] If the two magnetic structures 2 are offset by the width of a magnet 22, the magnetic pole distribution between the two magnetic structures 2 causes the magnetic attraction of the two magnetic structures 2 to be transformed into magnetic repulsion, and the magnetic structure 2 outside the shell 1 can no longer drive the magnetic structure 2 inside the shell 1 to move.

[0066] At the same time, there is a tendency for the magnetic repulsion between the two magnetic structures 2 to be converted into magnetic attraction. Since the magnetic structure 2 inside the shell 1 is limited, it cannot move forward synchronously with the magnetic structure 2 outside the shell 1. The magnetic structure 2 inside the shell 1 may even retreat by the width of a magnet 22, further increasing the error.

[0067] Therefore, in another specific embodiment, the magnetic poles at one end of the plurality of magnets 22 outside the housing 1 are arranged in the order of S1N2N3S4. In this arrangement, if the two magnetic sensing structures 2 are misaligned by the width of one magnet 22, the magnetic force is still greater than the attraction, and the two magnetic sensing structures 2 need to be misaligned by the width of two magnets 22 to cause repulsion.

[0068] Further, refer to Figure 1 and Figure 2 , the second limiting parts 5 are installed on both end covers 12, and the second limiting parts 5 are located outside the cylinder 11; a pair of first limiting parts 4 are arranged in the cylinder 11, and the pair of first limiting parts 4 are arranged opposite to each other in the cylinder 11, and the magnetic induction structure 2 in the cylinder 11 slides between the two first limiting parts 4. The spacing between the side of the first limiting part 4 close to the corresponding magnetic induction structure 2 and the side of the second limiting part 5 close to the corresponding magnetic induction structure 2 is equal to the thickness of the protective shell 61.

[0069] The first limiting portion 4 limits the magnetic induction structure 2 inside the cylinder 11, and the second limiting portion 5 limits the magnetic induction structure 2 outside the cylinder 11. When the magnetic induction structure 2 inside the cylinder 11 abuts against the second limiting portion 5, the magnetic induction structure 2 inside the cylinder 11 abuts against the first limiting portion 4.

[0070] When the magnetic induction structure 2 in the cylinder 11 cannot move any further due to limited travel, the magnetic induction structure 2 outside the cylinder 11 is also constrained by the second limit portion 5 and cannot move further. This makes the moving trajectory of the magnetic induction structure 2 at both ends of the cylinder 11 have a high consistency, thereby ensuring the measurement accuracy of the sensor.

[0071] Further, refer to Figure 3The mounting block 21 includes a frame 211 , a limiting rod 212 and a mounting plate 213 .

[0072] Among them, an opening 2111 is provided at one end of the frame 211, and a limiting groove 2112 is provided on the inner side wall of the frame 211, and the limiting groove 2112 is provided along the length direction of the frame 211; the limiting rod 212 is slidably connected in the limiting groove 2112; the mounting plate 213 is detachably connected to the frame 211 to close the opening 2111. Limiting rods 212 are provided between adjacent magnets 22, and a slot 221 for the limiting rod 212 to partially extend into is provided on the two side walls of the middle of the magnet 22.

[0073] When inserting multiple magnets 22 into the frame 211 in sequence, first place a magnet 22 in the frame 211, then slide the limiting rod 212 into the limiting groove 2112, and one side of the limiting rod 212 extends into the slot 221 on the magnet 22. After repeating the above sequence to complete the installation of the remaining magnets 22 and the limiting rod 212, fix the mounting plate 213 to the opening 2111 of the frame 211.

[0074] This connection method makes it easier and more convenient to assemble the magnetic sensing structure 2, and the limiting rod 212 can better position the magnet 22, thereby reducing the possibility that the magnet 22 is ejected from the mounting block 21 due to the magnetic repulsion force when there is a magnetic repulsion force between the two magnetic sensing structures 2.

[0075] At the same time, compared with the traditional method of fixing the magnets 22 by using covers on both sides of the frame 211, the thickness of the magnetic structure 2 can be reduced, so that the two groups of magnets 22 can be closer, thereby strengthening the adsorption force of the outer magnetic structure 2 on the inner magnetic structure 2.

[0076] Correspondingly, a pulley 7 is provided on the side where the two mounting blocks are close to each other, and the mounting block 21 cooperates with the wall gap of the cylinder 11 through the pulley 7, thereby reducing the friction between the mounting block 21 and the cylinder 11 when the adsorption force is too strong, so that the inner magnetic sensing structure 2 can respond to the movement of the outer magnetic sensing structure 2 more quickly.

[0077] Reference Figure 2 and Figure 4 A sliding core structure 9 is also provided in the housing 1, and the electric core is connected to the corresponding magnetic induction structure 2 through the sliding core structure 9.

[0078] Specifically, the slide core structure 9 includes a slide block 91 and a pair of limit blocks 92, the slide block 91 is connected to the bottom of the movable block, and the pair of limit blocks 92 are arranged oppositely on both sides of the slide block 91. Correspondingly, two groups of third slide grooves 113 are opened in the housing 1, and the two groups of third slide grooves 113 are arranged one-to-one with the pair of limit blocks 92, and the limit blocks 92 extend into the corresponding third slide grooves 113.

[0079] By providing the limit block 92 and the third slide groove 113 , when the driving structure 6 moves, the magnetic induction structure 2 located in the cylinder 11 can perform precise linear motion under the constraint of the limit block 92 , thereby further improving the measurement accuracy.

[0080] In a specific embodiment, the limit block 92 is made of graphite material, which has a low friction coefficient and can reduce the friction between the limit block 92 and the side wall of the third slide groove 113, thereby reducing the interference of friction force, and further reducing the misalignment of the magnetic sensing structure 2 located inside the cylinder 11 and the magnetic sensing structure 2 outside the cylinder 11 when the displacement sensor is working.

[0081] Furthermore, the sliding core structure 9 is suspended in the housing 1 through a pair of sliding core structures 9 (the magnet 22 uses a strong permanent magnet 22). The width of the third sliding groove 113 is greater than the width of the limit block 92, one end of the brush 32 is telescopically arranged at the bottom of the slider 91, and the other end of the brush 32 is in contact with the carbon film plate 31.

[0082] By suspending the sliding core structure 9, the friction between the sliding core structure 9 and the cylinder 11 is further reduced. When the outer magnetic induction structure 2 moves, the inner magnetic induction structure 2 can respond better, further reducing the friction between the sliding core structure 9 and the upper and lower surfaces of the third slide groove 113, ensuring that the two magnetic induction structures 2 can be more synchronized during the movement, and reducing the misalignment between the two magnetic induction structures 2.

[0083] In a specific embodiment, a cavity is opened on the bottom side of the slider 91, and a telescopic rod is connected in the cavity. The output end of the telescopic rod is connected to the brush 32, so that the length of the brush 32 extending out of the cavity can be adaptively changed with the up and down movement of the sliding core.

[0084] Reference Figure 1 and Figure 2 A first slide groove 111 and a pair of second slide grooves 112 arranged opposite to the first slide groove 111 are opened on the outer wall of the cylinder 11. The mounting block 21 extends into the first slide groove 111 and is tightly attached to the bottom wall of the first slide groove 111. A guide portion 64 extending into the second slide groove 112 is connected to the protective shell 61, and the guide portion 64 is tightly attached to a side of the second slide groove 112 close to the driving structure 6.

[0085] When the outer magnetic induction structure 2 slides relative to the cylinder 11 , the first slide groove 111 can guide the movement of the mounting block 21 , and the second slide groove 112 can guide the movement of the protective shell 61 .

[0086] At the same time, since the magnetic induction structure 2 is connected to the driving structure 6, when the mounting block 21 is in close contact with the bottom wall of the first slide groove 111 and the guide portion 64 is in close contact with the top wall of the second slide groove 112, the combination of the magnetic induction structure 2 and the driving structure 6 is engaged with the cylinder 11, so that the magnetic induction structure 2 located outside the cylinder 11 moves up and down during the movement.

[0087] In a second aspect, the present application provides a method for installing a magnetically dragged carbon film linear displacement sensor, comprising the following steps:

[0088] S1. Install an end cover 12 at one end of the cylinder 11, and install the first limiter 4 and the brush structure 3 in the cylinder 11 in sequence;

[0089] S2, installing a pair of magnetic induction structures 2 on the inner and outer sides of the cylinder 11, and determining the initial point and the end point of the movement of the magnetic induction structure 2;

[0090] S3, sliding the magnetic induction structure 2 outside the cylinder 11, ensuring that the magnetic induction structure 2 inside the cylinder 11 moves synchronously with the magnetic induction structure 2 outside the cylinder 11 before abutting against the second limiting portion 5;

[0091] S4, when the magnetic induction structure 2 in the cylinder 11 abuts against the second limiter 5, whether there is a gap between the magnetic induction structure 2 outside the cylinder 11 and the first limiter 4, if there is a gap, adjust the position of the second limiter 5 until the magnetic induction structure 2 outside the cylinder 11 abuts against the first limiter 4;

[0092] S5. Install the end cover 12 at the other end of the cylinder 11 to complete the final assembly.

[0093] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A magnetic drag type carbon film linear displacement sensor, characterized in that: include: The housing (1) comprises a cylinder (11) and a pair of end covers (12), wherein the pair of end covers (12) are mounted oppositely at two ends of the cylinder (11); A pair of magnetic induction structures (2) are arranged oppositely on the inner and outer sides of the cylinder (11); the magnetic induction structures (2) are slidably connected to the housing (1) and comprise a mounting block (21) and a plurality of magnets (22) arranged in the mounting block (21); the plurality of magnets (22) are arranged in sequence along the length direction of the cylinder (11); A brush structure (3) is arranged in the cylinder (11), comprising a carbon film plate (31) and a brush (32), one end of the brush (32) is in contact with the carbon film plate (31), and the other end of the brush (32) is connected to the magnetic induction structure (2) in the cylinder (11); A pair of first limiting portions (4) are arranged opposite to each other in the cylinder (11), and the magnetic induction structure (2) in the cylinder (11) slides between the two first limiting portions (4); A second limiting portion (5), each of the end covers (12) is provided with the second limiting portion (5), and the second limiting portion (5) is arranged outside the cylinder (11); When the magnetic induction structure (2) in the cylinder (11) abuts against the second limiting portion (5), the magnetic induction structure (2) in the cylinder (11) abuts against the first limiting portion (4).

2. A magnetic drag type carbon film linear displacement sensor according to claim 1, characterized in that: A driving structure (6) is arranged outside the housing (1), and the driving structure (6) comprises: A protective shell (61) is disposed on the corresponding magnetic induction structure (2); A pull rod (62), one end of which is connected to the protective shell (61), and the other end of which is connected to a joint (63); The distance between a side of the first limiting portion (4) close to the corresponding magnetic induction structure (2) and a side of the second limiting portion (5) close to the corresponding magnetic induction structure (2) is equal to the thickness of the protective shell (61).

3. A magnetic drag type carbon film linear displacement sensor according to claim 2, characterized in that: The outer wall of the cylinder (11) is provided with a first slide groove (111) and a pair of second slide grooves (112) arranged opposite to the first slide groove (111); the mounting block (21) extends into the first slide groove (111) and is in close contact with the bottom wall of the first slide groove (111); The protective shell (61) is connected to a guide portion (64) extending into the second slide groove (112), and the guide portion (64) is in close contact with a side of the second slide groove (112) close to the driving structure (6).

4. The magnetic drag type carbon film linear displacement sensor according to claim 3, characterized in that: A pulley (7) is provided on the mutually adjacent sides of the two mounting blocks (21), and the mounting blocks (21) are clearance-matched with the wall surface of the cylinder (11) via the pulley (7).

5. A magnetic drag type carbon film linear displacement sensor according to claim 1 or 4, characterized in that: The mounting block (21) comprises: A frame body (211), wherein one end of the frame body (211) is provided with an opening (2111), and a limiting groove (2112) is provided on an inner side wall of the frame body (211), and the limiting groove (2112) is provided along the length direction of the frame body (211); A limiting rod (212) slidably connected in the limiting groove (2112); A mounting plate (213) detachably connected to the frame (211) to close the opening (2111); The limiting rods (212) are arranged between adjacent magnets (22), and two side walls of the middle of the magnets (22) are provided with slots (221) for the limiting rods (212) to partially extend into.

6. The magnetic drag type carbon film linear displacement sensor according to claim 1, characterized in that: A sealing gasket (8) is provided between the end of the housing (1) and the corresponding end cover (12).

7. The magnetic drag type carbon film linear displacement sensor according to claim 1, characterized in that: A sliding core structure (9) is arranged in the housing (1), and the brush (32) is connected to the corresponding magnetic induction structure (2) through the sliding core structure (9), and the sliding core structure (9) comprises: A slider (91), wherein the brush (32) is connected to the bottom of the slider (91); A pair of limit blocks (92) are arranged oppositely on two sides of the sliding block (91); Two groups of third sliding grooves (113) are provided in the housing (1), and the two groups of third sliding grooves (113) are arranged in one-to-one correspondence with a pair of limit blocks (92), and the limit blocks (92) extend into the corresponding third sliding grooves (113).

8. The magnetic drag type carbon film linear displacement sensor according to claim 7, characterized in that: The sliding core structure (9) is suspended in the housing (1) through a pair of the sliding core structures (9); the width of the third sliding groove (113) is greater than the width of the limit block (92); one end of the brush (32) is telescopically connected to the bottom of the slider (91); and the other end of the brush (32) is in contact with the carbon film plate (31).

9. A method for installing a magnetically dragged carbon film linear displacement sensor, based on the magnetically dragged carbon film linear displacement sensor according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Install an end cover (12) at one end of the cylinder (11), and install the first limit portion (4) and the brush structure (3) in the cylinder (11) in sequence; S2, installing a pair of magnetic induction structures (2) on the inner and outer sides of the cylinder (11), and determining the initial point and the end point of the movement of the magnetic induction structures (2); S3, sliding the magnetic induction structure (2) outside the cylinder (11) to ensure that the magnetic induction structure (2) inside the cylinder (11) moves synchronously with the magnetic induction structure (2) outside the cylinder (11) before the magnetic induction structure (2) inside the cylinder (11) abuts against the second limiting portion (5); S4, detecting whether there is a gap between the magnetic induction structure (2) outside the cylinder (11) and the first limiting portion (4) when the magnetic induction structure (2) inside the cylinder (11) abuts against the second limiting portion (5); if there is a gap, adjusting the position of the second limiting portion (5) until the magnetic induction structure (2) outside the cylinder (11) abuts against the first limiting portion (4); S5. Install the end cover (12) at the other end of the cylinder (11) to complete the final assembly.

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