Pull rope type magnetic induction displacement sensor

Abstract

The invention relates to the technical field of detection, in particular to a pull rope type magnetic induction displacement sensor which comprises a shell, a rotating shaft, a movable structure and a plurality of reset structures. One end of the rotating shaft extends into the shell and is rotationally connected with the shell; the movable structure is located in the shell and comprises a winding wheel fixedly connected to the rotating shaft and a pull rope wound around the winding wheel. The multiple reset structures are located in the shell and are sequentially arranged in the axis direction of the rotating shaft, and each reset structure comprises a box body and a volute spiral spring arranged in the box body; wherein adjacent box bodies are fixedly connected, and at least one box body is fixedly connected with the rotating shaft. The device has the effect of being high in bearing capacity.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a pull-rope type magnetic induction displacement sensor. Background Art

[0002] The draw-wire magnetic induction displacement sensor is a precision device used to measure linear position. It measures the displacement of an object by the expansion and contraction of a stainless steel rope, and has the advantages of high precision, high reliability and easy installation.

[0003] The applications of draw-wire magnetic displacement sensors are very wide, including but not limited to industrial automation, mechanical equipment, aerospace, transportation, construction engineering, etc. In these fields, draw-wire magnetic displacement sensors are used to measure linear positions, such as hydraulic cylinder positions, lifting platforms, off-highway vehicles, automotive and aerospace testing, factory automation, medical equipment, building structure monitoring, industrial machinery and automation, laboratories and test platforms, etc.

[0004] The pull-rope magnetic induction sensor mainly includes a rotating shaft, a winding wheel and a pull rope wound on the winding wheel. The winding wheel is sleeved on the rotating shaft and rotates synchronously with the rotating shaft. One end of the rotating shaft is connected to a vortex spring, and the other end of the rotating shaft is connected to an encoder.

[0005] When the pull rope is pulled under the load, the pull rope drives the shaft to rotate. The encoder calculates the stretched length of the pull rope according to the number of rotations of the shaft, and then converts it into position information. When the pull rope no longer bears the load, the volute spring applies elastic force to the shaft to make the shaft rotate in the opposite direction, and the pull rope is rewound onto the winding wheel.

[0006] Since the application environment of the draw-rope magnetic induction sensor is relatively harsh, the draw-rope magnetic induction sensor needs to withstand a relatively high load, and the load-bearing capacity of the existing draw-rope magnetic induction sensor needs to be improved. Summary of the invention

[0007] The purpose of the present application is to provide a pull-wire type magnetic induction displacement sensor with a higher load-bearing capacity.

[0008] The present application provides a pull-wire magnetic induction displacement sensor that adopts the following technical solution:

[0009] A pull-wire type magnetic induction displacement sensor, comprising:

[0010] case;

[0011] A rotating shaft, one end of which extends into the housing and is rotatably connected to the housing;

[0012] A movable structure, which is located in the housing and includes a winding wheel fixed to the rotating shaft and a pull rope wound around the winding wheel;

[0013] A plurality of reset structures, the plurality of reset structures are located in the housing and are sequentially arranged along the axis direction of the rotating shaft, each of the reset structures comprises a box body and a volute spring disposed in the box body;

[0014] Wherein, the adjacent box bodies are fixedly connected, and at least one of the box bodies is fixedly connected to the rotating shaft.

[0015] Furthermore, there are two spiral springs in each of the boxes;

[0016] The pull-wire type magnetic induction displacement sensor also includes:

[0017] A plurality of connection structures are arranged corresponding to the plurality of the box bodies one by one, the connection structures are arranged in the corresponding box bodies, and include a first connection sleeve and a second connection sleeve, one group of the volute springs is connected to the first connection sleeve, and another group of the volute springs is connected to the second connection sleeve;

[0018] One end of the second connecting sleeve is engaged with the first connecting sleeve in the corresponding box body, and the other end of the second connecting sleeve extends out of the corresponding box body and is engaged with another first connecting sleeve in the adjacent box body;

[0019] The rotating shaft is clamped with any one of the first connecting sleeve / the second connecting sleeve.

[0020] Furthermore, a plurality of clamping parts are provided in the middle of the rotating shaft;

[0021] A clamping sleeve is fixedly connected to one end of the winding wheel close to the reset structure, and a plurality of clamping slots are provided on the inner side of the clamping sleeve, wherein the plurality of clamping parts are arranged in one-to-one correspondence with the plurality of clamping slots and are inserted into the corresponding clamping slots.

[0022] Furthermore, both ends of the rotating shaft are provided with step surfaces, and both sides of the housing are provided with bearings, and the two bearing sleeves are arranged on the rotating shaft and abut against the end surfaces of the step surfaces.

[0023] Furthermore, a sleeve is provided on one end of the rotating shaft away from the reset structure, one end of the sleeve is threadedly connected to the winding wheel, and the other end of the sleeve is sealed and connected to the inside of the shell.

[0024] Furthermore, a threading hole is provided on the housing, and the threading hole is provided along the length direction of the housing, and a spiral limiting groove is provided on the outer peripheral side wall of the winding wheel for limiting the pull rope;

[0025] The housing is provided with a matching groove connected with the threading hole, and a matching structure is provided between the housing and the winding wheel;

[0026] The matching structure comprises:

[0027] A matching block, wherein the matching block is at least partially disposed in the matching groove and is threadedly matched with the groove wall of the limiting groove, and the matching block has a travel that moves along the length direction of the cylinder;

[0028] A limit block is slidably disposed in the threading hole and is integrally formed with the matching block;

[0029] A through hole is sequentially arranged through the matching block and the limiting block, and is used for the pull rope to pass through.

[0030] Furthermore, the end of the limit block close to the magnetic induction structure is connected to a mounting plate, the shell is provided with a mounting groove connected to the threading hole along its length direction, and the mounting plate is at least partially slidably disposed in the mounting groove.

[0031] Furthermore, the housing is provided with a movable groove connected to the threading hole along its length direction, and a sealing structure is provided in the movable groove;

[0032] The sealing structure comprises:

[0033] A sealing plate is slidably disposed in the movable groove, one end of which extends out of the movable groove and abuts against an end of the limit block close to the reset structure;

[0034] The elastic member has one end abutting against the groove wall of the movable groove and the other end abutting against the sealing plate.

[0035] Furthermore, a joining groove is formed on a side of the limiting block away from the movable block, and a portion of the sealing plate extends into the joining groove to form an L-shaped joint.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] 1. In the present application, a plurality of reset structures are provided, and adjacent reset structures are connected by a connecting structure. In the process of pulling the pull rope to drive the winding wheel to rotate, the load needs to be able to overcome the elastic force of the plurality of reset structures, so that the load capacity of the sensor is greatly improved.

[0038] 2. A matching structure is provided in the present application. When the pull rope is pulled out, the matching block in the matching groove is threadedly matched with the groove wall of the limiting groove. When the winding wheel rotates, the matching block and the limiting block are driven to slide along the length direction of the limiting groove by the power of the winding wheel rotation. In this way, the position of the through hole relative to the shell changes, and the position where the pull rope leaves the winding wheel is always flush with the position of the through hole. In this way, the measurement accuracy of the sensor can be further improved under the premise of increasing the sensor range.

[0039] 3. In the present application, a sealing structure and a mounting plate are provided. Under the combined effect of the sealing structure and the mounting plate, the sealing performance of the sensor is improved, thereby reducing the problem of poor sealing performance of the sensor when the position of the through hole can be changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a three-dimensional structural schematic diagram of the pull-wire type magnetic induction displacement sensor in the present application;

[0041] Figure 2 It is a schematic cross-sectional view of the structure of the draw-wire type magnetic induction displacement sensor in the present application;

[0042] Figure 3 yes Figure 2 A partial enlarged schematic diagram of part A;

[0043] Figure 4 It is a partial structural schematic diagram of the magnetic sensing structure in this application;

[0044] Figure 5 yes Figure 2 A partial enlarged schematic diagram of part B;

[0045] Figure 6 It is a three-dimensional structural schematic diagram of the connection structure in this application;

[0046] Figure 7 It is a cross-sectional structural schematic diagram of another viewing angle of the draw-wire type magnetic induction displacement sensor in the present application;

[0047] Figure 8 yes Figure 7 A partial enlarged schematic diagram of part C in the middle.

[0048] In the figure, 1, shell; 11, threading hole; 12, matching groove; 13, mounting groove; 14, movable groove; 15, fixed groove; 2, rotating shaft; 21, step surface; 3, movable structure; 31, winding wheel; 311, limiting groove; 32, pull rope; 4, reset structure; 41, box body; 42, scroll spring; 5, connecting structure; 51, first connecting sleeve; 52, second connecting sleeve; 6, magnetic induction structure; 61, mounting seat; 62, movable sleeve; 63, main gear; 64, sub-gear; 65, magnetic core; 66, circuit board; 7, matching structure; 71, matching block; 72, limiting block; 721, engaging groove; 73, through hole; 8, mounting plate; 9, sealing structure; 91, sealing plate; 92, elastic member; 10, clamping part; 20, clamping sleeve; 201, clamping groove; 30, bearing; 40, bushing; 50, fixed sleeve. DETAILED DESCRIPTION

[0049] The following will be combined with the attached Figure 1-8The 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] A pull-wire magnetic induction displacement sensor, referring to Figure 1 and Figure 2 , including a shell 1, a rotating shaft 2, a movable structure 3 and a magnetic induction structure 6. The rotating shaft 2 is rotatably arranged in the shell 1, and the magnetic induction structure 6 is arranged at one end of the rotating shaft 2; the movable structure 3 is sleeved on the rotating shaft 2, and includes a winding wheel 31 and a pull rope 32 wound around the winding wheel 31. The winding wheel 31 is fixedly connected to the rotating shaft 2 and rotates synchronously with the rotating shaft 2.

[0054] When the pull rope 32 is pulled, the winding wheel 31 and the rotating shaft 2 will be driven to rotate synchronously, and the magnetic sensing structure 6 will detect the number of rotations of the winding wheel 31, and then obtain the length of the pull rope 32 pulled out of the housing 1.

[0055] Specifically, combined Figure 3 and Figure 4The magnetic induction structure 6 includes a mounting seat 61, a main gear 63, a sub-gear 64 and a circuit board 66. A movable sleeve 62 is rotatably arranged in the mounting seat 61, and one end of the movable sleeve 62 is clamped with the rotating shaft 2; the main gear 63 is clamped at the other end of the movable sleeve 62; a plurality of sub-gears 64 are arranged, and the plurality of sub-gears 64 are arranged around the main gear 63 and rotatably arranged on the mounting seat 61, and a magnetic core 65 is coaxially arranged in the plurality of sub-gears 64, and the circuit board 66 is spaced apart from the magnetic core 65.

[0056] When the shaft 2 rotates, it will drive the main gear 63 to rotate synchronously, and the sub-gear 64 meshing with the main gear 63 will further rotate, causing the magnetic core 65 located in the sub-gear 64 to rotate, thereby changing the magnetic field distribution in the magnetic sensing structure 6. The circuit board 66 has a magnetic sensing element (not shown in the figure), which records the change in the magnetic field and analyzes it, and finally outputs the extension length of the pull rope 32 in the form of an electrical signal.

[0057] Further, refer to Figure 5 and Figure 6 A reset structure 4 is provided at the other end of the rotating shaft 2. The reset structure 4 includes a box body 41 and two groups of spiral springs 42 disposed in the box body 41. The two groups of spiral springs 42 are disposed on two sides of the box body 41 opposite to each other.

[0058] Both sets of volute springs 42 are connected to the rotating shaft 2. When the rotating shaft 2 rotates, the volute springs 42 are pulled, and the rotating shaft 2 is subjected to the tension of the volute springs 42. When the pull rope 32 is no longer connected to the load, the volute springs 42 rebound, driving the rotating shaft 2 to rotate in the opposite direction, so that the pull rope 32 is reset.

[0059] Furthermore, combined with Figure 2 Considering that the pull-wire magnetic induction displacement sensor needs to work stably under high load conditions, that is, it needs to withstand greater tension / pressure, a plurality of reset structures 4 are provided, and the plurality of reset structures 4 are arranged in sequence at one end of the rotating shaft 2 along the axial direction of the rotating shaft 2.

[0060] In a specific embodiment, three reset structures 4 are provided. When the pull rope 32 is pulled to drive the winding wheel 31 to rotate, the load needs to be able to overcome the elastic force of multiple reset structures 4, so that the load capacity of the sensor is greatly improved.

[0061] Specifically, the pull-wire type magnetic induction displacement sensor further includes a plurality of connection structures 5, and the plurality of connection structures 5 are arranged in one-to-one correspondence with the plurality of box bodies 41. The connection structure 5 is arranged in the corresponding box body 41, and includes a first connection sleeve 51 and a second connection sleeve 52. One group of spiral springs 42 is connected to the first connection sleeve 51, and another group of spiral springs 42 is connected to the second connection sleeve 52.

[0062] One end of the second connecting sleeve 52 is clamped with the first connecting sleeve 51 in the corresponding box body 41, and the other end of the second connecting sleeve 52 extends out of the corresponding box body 41 and is clamped with another first connecting sleeve 51 in the adjacent box body 41, and the rotating shaft 2 is clamped with any first connecting sleeve 51 / second connecting sleeve 52.

[0063] In a specific embodiment, the rotating shaft 2 is clamped with a first connecting sleeve 51 closest to the winding wheel 31. The rotating shaft 2 drives the first connecting sleeve 51 to rotate, and then drives the remaining first connecting sleeves 51 and second connecting sleeves 52 to rotate, so that multiple connecting structures 5 operate synchronously.

[0064] In another specific embodiment, multiple first connecting sleeves 51 / second connecting sleeves 52 may be engaged with the rotating shaft 2 , thereby reducing the possibility of bending or displacement of the rotating shaft 2 due to large deflection and improving the working stability of the reset structure 4 .

[0065] In addition, refer to Figure 2 A fixing groove 15 is formed at one end of the housing 1 close to the reset structure 4 , and a fixing sleeve 50 is disposed in the fixing groove 15 . One end of the fixing sleeve 50 is rotatably disposed in the fixing groove 15 , and the other end is engaged with the second connecting sleeve 52 .

[0066] When the connection structure 5 rotates driven by the reset structure 4, the combination of the fixing sleeve 50 and the fixing groove 15 can constrain the reset structure 4, further reducing the possibility of misalignment and deviation of the rotating shaft 2 during rotation, so that the rotating shaft 2 and the reset structure 4 have a higher concentricity.

[0067] Furthermore, a plurality of clamping parts 10 are arranged around the middle of the rotating shaft 2, and a clamping sleeve 20 is fixedly connected to one end of the winding wheel 31 close to the reset structure 4;

[0068] A plurality of slots 201 are formed on the inner side of the clamp sleeve 20 . The plurality of clamping parts 10 are arranged correspondingly to the plurality of slots 201 and inserted into the corresponding slots 201 .

[0069] Further, refer to Figure 5 Both ends of the rotating shaft 2 are provided with step surfaces 21, and the sides where the reset structure 4 and the magnetic induction structure 6 are close to each other are provided with bearings 30. The two bearings 30 are sleeved on the rotating shaft 2 and abut against the end surfaces of the step surfaces 21.

[0070] The bearing 30 can support and position the rotating shaft 2, and at the same time can reduce the friction between the bearing 30 and the housing 1, so that the rotating shaft 2 can rotate more steadily and smoothly.

[0071] In addition, refer to Figure 2 A shaft sleeve 40 is sleeved on one end of the rotating shaft 2 close to the magnetic induction structure 6 , and both ends of the shaft sleeve 40 are sealedly connected to the winding wheel 31 and the mounting seat 61 respectively.

[0072] The shaft sleeve 40 can fix the position of the shaft 2 and seal the shaft 2 at the same time, thereby reducing the entry of pollutants or moisture into the matching area between the shaft 2 and the magnetic sensing structure 6, thereby better protecting the magnetic sensing structure 6.

[0073] In a traditional sensor, the through hole 73 for the pull rope 32 to pass through is fixed in position relative to the shell 1. As the pull rope 32 is pulled out of the shell 1 and becomes longer and longer, the position where the pull rope 32 leaves the winding wheel 31 will change, and the distance between this position and the through hole 73 will also become longer and longer, resulting in a large deviation between the actual value and the measured value.

[0074] In order to reduce the deviation, the length of the winding wheel 31 and the shell 1 in the traditional sensor is usually smaller, while in the present application, the length of the shell 1 is at least twice the length of the winding wheel 31, the sleeve 40 is threadedly connected to the winding wheel 31, and the winding wheel 31 has a sliding stroke along the length direction of the rotating shaft 2.

[0075] When the winding wheel 31 rotates, due to the cooperation of the clamping sleeve 20 and the releasing sleeve, the rotating shaft 2 is driven, and the winding wheel 31 and the shaft sleeve 40 are threadedly connected. At this time, the winding wheel 31 slides along the length direction of the rotating shaft 2, and the rotating shaft 2 is fixed in the radial direction at both ends, and the rotating shaft 2 only rotates. In this way, the winding wheel 31 can adjust its own position corresponding to the gradual extension of the pull rope 32, thereby ensuring higher accuracy with a larger measuring range.

[0076] Further, refer to Figure 7 and Figure 8 In another specific embodiment, a threading hole 11 is provided on the shell 1, and the threading hole 11 is provided along the length direction of the shell 1. A spiral limiting groove 311 is provided on the outer peripheral side wall of the winding wheel 31 for limiting the pull rope 32. A matching groove 12 connected to the threading hole 11 is provided on the shell 1, and a matching structure 7 is provided between the shell 1 and the winding wheel 31.

[0077] Specifically, the mating structure 7 includes a mating block 71 and a limiting block 72. The mating block 71 is at least partially arranged in the mating groove 12 and is threadedly engaged with the groove wall of the limiting groove 311. The mating block 71 has a stroke for moving along the length direction of the cylinder. The limiting block 72 is slidably arranged in the limiting groove 311 and is integrally formed with the mating block 71. A through hole 73 is opened on the mating structure 7, and the through hole 73 passes through the mating block 71 and the limiting block 72 in sequence.

[0078] When assembling the sensor, the pull rope 32 is wound around the winding wheel 31 , and the pull rope 32 is limited by the limiting groove 311 , so that the pull rope 32 can be smoothly pulled out of the housing 1 .

[0079] When the pull rope 32 is pulled out, the matching block 71 in the matching groove 12 is threadedly matched with the groove wall of the limiting groove 311. When the winding wheel 31 rotates, the matching block 71 and the limiting block 72 are driven to slide along the length direction of the limiting groove 311 by the power of the rotation of the winding wheel 31. In this way, the position of the through hole 73 relative to the housing 1 changes.

[0080] Reference Figure 7 The length of the winding wheel 31 (along its own axial direction) is at least 6 times that of the reset structure 4. In a specific embodiment, the length of the winding wheel 31 is 7 times that of the reset mechanism. The longer winding wheel 31 can wind a longer pull rope 32, thereby increasing the measuring range of the sensor.

[0081] At the same time, since the position of the through hole 73 can adaptively adjust its own position along with the rotation of the winding wheel 31, the position where the pull rope 32 leaves the winding wheel 31 always remains flush with the position of the through hole 73. This can further improve the measurement accuracy of the sensor while increasing the sensor range.

[0082] In addition, during the process of retracting the pull rope 32 into the shell 1, due to the threaded cooperation between the mating block 71 and the winding wheel 31, the mating block 71 will match its own sliding speed according to the rotation speed of the winding wheel 31, so that the pull rope 32 can be re-limited to the limiting groove 311 in an orderly manner, thereby reducing the possibility of the pull rope 32 being tangled or entangled during the resetting process, thereby ensuring the stable operation of the sensor.

[0083] Furthermore, the limit block 72 has a starting point and an end point when sliding along the length direction of the threading hole 11. When the limit block 72 is between the starting point and the end point, the corresponding areas at both ends of the limit block 72 are connected to the outside world, resulting in poor sealing performance of the sensor.

[0084] Therefore, combined with Figure 8 The end of the limit block 72 close to the magnetic induction structure 6 is connected to the mounting plate 8. The housing 1 is provided with a mounting groove 13 connected to the threading hole 11 along its length direction. The mounting plate 8 is at least partially slidably disposed in the mounting groove 13.

[0085] By providing the mounting plate 8, the area where one end of the limit block 72 is connected to the outside can be blocked, thereby improving the sealing performance of the sensor.

[0086] In a specific embodiment, the mounting plate 8 is telescopically arranged, which reduces the depth of the mounting groove 13 and reduces the required length of the housing 1, thereby effectively ensuring the strength of the housing 1.

[0087] Further, refer to Figure 7 and Figure 8The housing 1 is provided with a movable groove 14 connected to the threading hole 11 along its length direction, and a sealing structure 9 is arranged in the movable groove 14; the sealing structure 9 includes a sealing plate 91 and an elastic member 92; the sealing plate 91 is slidably arranged in the movable groove 14, one end of which extends out of the movable groove 14 and abuts against an end of the limit block 72 close to the reset structure 4; one end of the elastic member 92 abuts against the groove wall of the movable groove 14, and the other end abuts against the sealing plate 91.

[0088] By setting up a sealing structure 9, the area where the other end of the limit block 72 is connected to the outside is blocked. Under the combined action of the sealing structure 9 and the mounting plate 8, the sealing performance of the sensor is improved, thereby reducing the problem of poor sealing performance of the sensor when the position of the through hole 73 can be changed.

[0089] At the same time, the setting of the elastic member 92 can help the matching structure 7 move during the resetting of the pull rope 32, reducing the interference of the friction force between the matching structure 7 and the shell 1 during the rotation of the winding wheel 31, so that the resetting action can be responded to more quickly.

[0090] In addition, a joint groove 721 is formed on the side of the limit block 72 away from the movable block, and the sealing plate 91 partially extends into the joint groove 721 to form an L-shaped joint. The L-shaped joint reduces the possibility of liquid penetrating into the housing 1 from the matching structure 7, further improving the sealing performance of the sensor.

[0091] 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 pull-wire magnetic induction displacement sensor, characterized in that: include: Housing (1); A rotating shaft (2), one end of which extends into the housing (1) and is rotatably connected to the housing (1); A movable structure (3) is located in the housing (1), comprising a winding wheel (31) fixedly connected to the rotating shaft (2) and a pull rope (32) wound around the winding wheel (31); A plurality of reset structures (4), the plurality of reset structures (4) being located in the housing (1) and arranged in sequence along the axial direction of the rotating shaft (2), each of the reset structures (4) comprising a box body (41) and a spiral spring (42) disposed in the box body (41); Wherein, adjacent box bodies (41) are fixedly connected, and at least one box body (41) is fixedly connected to the rotating shaft.

2. A pull-wire magnetic induction displacement sensor according to claim 1, characterized in that: There are two spiral springs (42) in each box body (41); The pull-wire type magnetic induction displacement sensor also includes: A plurality of connection structures (5) are arranged in one-to-one correspondence with the plurality of box bodies (41); the connection structures (5) are arranged in the corresponding box bodies (41), and include a first connection sleeve (51) and a second connection sleeve (52); one group of the spiral springs (42) is connected to the first connection sleeve (51), and another group of the spiral springs (42) is connected to the second connection sleeve (52); One end of the second connecting sleeve (52) is snap-connected with the first connecting sleeve (51) in the corresponding box body (41), and the other end of the second connecting sleeve (52) extends out of the corresponding box body (41) and is snap-connected with another first connecting sleeve (51) in the adjacent box body (41); The rotating shaft (2) is clamped with any one of the first connecting sleeve (51) and the second connecting sleeve (52).

3. A pull-wire magnetic induction displacement sensor according to claim 1, characterized in that: A plurality of clamping parts (10) are provided in the middle of the rotating shaft (2); A clamping sleeve (20) is fixedly connected to one end of the winding wheel (31) close to the reset structure (4), and a plurality of clamping grooves (201) are provided on the inner side of the clamping sleeve (20), wherein the plurality of clamping parts (10) are arranged in a one-to-one correspondence with the plurality of clamping grooves (201) and are inserted into the corresponding clamping grooves (201).

4. A pull-wire magnetic induction displacement sensor according to claim 3, characterized in that: Both ends of the rotating shaft (2) are provided with step surfaces (21), and both sides of the housing (1) are provided with bearings (30). The two bearings (30) are sleeved on the rotating shaft (2) and abut against the end surfaces of the step surfaces (21).

5. The pull-wire magnetic induction displacement sensor according to claim 3, characterized in that: A shaft sleeve (40) is sleeved on one end of the rotating shaft (2) away from the reset structure (4); one end of the shaft sleeve (40) is connected to the winding wheel (31); and the other end of the shaft sleeve is sealedly connected to the inside of the housing (1).

6. A pull-wire magnetic induction displacement sensor according to claim 5, characterized in that: The shaft sleeve (40) is threadedly connected to the winding wheel (31), and the winding wheel (31) has a sliding stroke along the length direction of the rotating shaft (2), and the length of the winding wheel (31) is at least twice that of the housing (2).

7. The pull-wire magnetic induction displacement sensor according to claim 1, characterized in that: The housing (1) is provided with a threading hole (11), the threading hole (11) is provided along the length direction of the housing (1), and the outer peripheral side wall of the winding wheel (31) is provided with a spiral limiting groove (311) for limiting the pull rope (32); The housing (1) is provided with a matching groove (12) which is in communication with the threading hole (11), and a matching structure (7) is provided between the housing (1) and the winding wheel (31); The matching structure (7) comprises: A matching block (71), wherein the matching block (71) is at least partially disposed in the matching groove (12) and is threadedly matched with the groove wall of the limiting groove (311), and the matching block (71) has a travel that moves along the length direction of the cylinder; A limit block (72) is slidably disposed in the threading hole (11) and is integrally formed with the matching block (71); A through hole (73) is provided sequentially through the matching block (71) and the limiting block (72) and is used for passing the pull rope (32).

8. The pull-wire magnetic induction displacement sensor according to claim 7, characterized in that: The end of the limit block (72) facing away from the reset structure (4) is connected to a mounting plate (8); the housing (1) is provided with a mounting groove (13) connected to the threading hole (11) along its length direction; and the mounting plate (8) is at least partially slidably disposed in the mounting groove (13).

9. The pull-wire magnetic induction displacement sensor according to claim 7, characterized in that: The housing (1) is provided with a movable groove (14) along its length direction and connected to the threading hole (11), and a sealing structure (9) is arranged in the movable groove (14); The sealing structure (9) comprises: A sealing plate (91) is slidably disposed in the movable groove (14), one end of which extends out of the movable groove (14) and abuts against an end of the limit block (72) close to the reset structure (4); An elastic member (92) has one end abutting against the groove wall of the movable groove (14) and the other end abutting against the sealing plate (91).

10. The pull-wire type magnetic induction displacement sensor according to claim 9, characterized in that: A joining groove (721) is provided on a side of the limiting block (72) facing away from the movable block, and a portion of the sealing plate (91) extends into the joining groove (721) to form an L-shaped joint.

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