Pull rope type displacement sensor capable of realizing self-calibration

Abstract

The invention discloses a pull rope type displacement sensor capable of realizing self-calibration, which comprises a sensor body, a rotating shaft is mounted in the middle of the sensor body, and a rotating shaft is fixedly mounted in the middle of the rotating shaft. Through operation of a constant-force spring in the constant-force spring bottom cover assembly, a rotating shaft is driven to rotate reversely, a shaft wheel is driven to rotate synchronously, a steel wire rope is wound around the shaft wheel, the steel wire rope is driven to be sequentially wound around the shaft wheel through extrusion positioning of an extrusion column on the steel wire rope wound around the shaft wheel, and the steel wire rope is prevented from being stacked and wound around the shaft wheel; after the steel wire rope is wound around the shaft wheel, the arc-shaped triangular groove in the shaft wheel rotates to the arc-shaped triangular block, the inclined face of the arc-shaped triangular block extrudes the inclined face of the arc-shaped triangular groove, rotation of the shaft wheel is controlled, the arc-shaped triangular block is driven to be completely contained in the arc-shaped triangular groove, and the rotation angle of the shaft wheel can be automatically reset; and automatic calibration of the pull rope type displacement sensor can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of draw-rope type displacement sensors, in particular to a draw-rope type displacement sensor capable of realizing self-calibration. Background Art

[0002] The draw-rope displacement sensor is a linear displacement sensor with an ingenious structure. It can convert mechanical motion into an electrical signal that can be measured, recorded or transmitted. It is used to obtain the displacement, direction or speed of a moving object. It has a small installation size, compact structure, large measuring stroke and high accuracy.

[0003] The pull-rope displacement sensor is mainly composed of a sensor body, a wire rope, a shaft wheel, a rotating shaft, a rotating shaft, a mounting head, a constant force spring and other components. The shaft wheel is driven by the pulling of the wire rope, which in turn drives the rotating shaft to rotate, and then drives the rotating shaft to rotate. When the rotating shaft rotates, it drives the sensing component in the sensor to rotate, thereby obtaining the length of the wire rope pulled out. After long-term use, the constant force spring will have a certain elastic fatigue. When the wire rope is wound up, the wire rope cannot be completely retracted on the shaft wheel through the action of the constant force spring, and the initial position of the wire rope cannot be calibrated. At the same time, when the shaft wheel is used to wind up the wire rope, the wire rope is wound up on the outside of the shaft wheel in sequence through the mutual squeezing between the wire rope loops on the shaft wheel. When the wire rope is wound up quickly, the wire rope will overlap and be wound up on the shaft wheel, which will affect the detection accuracy. Summary of the invention

[0004] The object of the present invention is to provide a self-calibrated pull-wire displacement sensor to solve the problems mentioned in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a self-calibrated pull-wire displacement sensor, comprising a sensor body, a rotating shaft is installed in the middle of the sensor body, a rotating shaft is fixedly installed in the middle of the rotating shaft, an axle wheel is fixedly installed on the outside of the rotating shaft, a wire box housing is fixedly installed on one end of the sensor body, the axle wheel is arranged inside the wire box housing, a constant force spring bottom cover assembly is fixedly installed on one side of the wire box housing, the end of the rotating shaft is clamped with the constant force spring bottom cover assembly, a steel wire rope is fixedly installed in the middle of the axle wheel, the steel wire rope passes through the outer shell of the wire box housing, an extrusion column is installed in the middle of the outer ring of the axle wheel, the extrusion column is in compression contact with the steel wire rope, a rotating groove is opened in the middle of one side of the axle wheel, an arc-shaped triangular groove is opened at the internal position of the axle wheel corresponding to the rotating groove, an arc-shaped triangular block is installed at the position of the inner wall of the wire box housing corresponding to the arc-shaped triangular groove, and the arc-shaped triangular block is clamped with the arc-shaped triangular groove.

[0006] As a further preferred embodiment of the present technical solution, a first sleeve is symmetrically fixedly installed on the middle inner wall of the wire pull box shell, a first slide bar is fixedly installed at the position of the middle of the extrusion column corresponding to the first sleeve, the first slide bar is slidably connected to the first sleeve, a first spring is fixedly installed on one end of the first slide bar away from the extrusion column, and one end of the first spring away from the first slide bar is fixedly connected to the bottom inner wall of the first sleeve.

[0007] As a further preferred embodiment of the present technical solution, a support shaft is fixedly installed in the middle of the extrusion column, and a positioning ring groove is opened in the middle of the outer ring of the shaft wheel, and the positioning ring groove is arranged in rolling contact with the support shaft.

[0008] As a further preferred embodiment of the present technical solution, the distance between the lowest end of the extrusion column and the lowest end of the middle part of the shaft wheel is equal to the diameter of the wire rope.

[0009] As a further preferred embodiment of the present technical solution, a positioning rod is rotatably installed inside the wire pull box housing at a position corresponding to the outlet of the wire rope, a thread groove is provided on the outer ring of the positioning rod, and the wire rope is arranged inside the thread groove.

[0010] As a further preferred embodiment of the present technical solution, a second sleeve is symmetrically fixedly installed on the inner wall of one side of the wire pull box shell, a second slide rod is symmetrically fixedly installed on one side of the arc-shaped triangular block, the second slide rod is slidably connected to the second sleeve, a second spring is fixedly installed on one end of the second slide rod away from the arc-shaped triangular block, and the end of the second spring away from the second slide rod is fixedly connected to the bottom inner wall of the second sleeve.

[0011] As a further preferred embodiment of the present technical solution, the second sleeve is arranged at the rotation track of the rotating groove.

[0012] As a further preferred embodiment of the present technical solution, a mounting head is movably mounted on the end of the steel wire rope.

[0013] The present invention provides a self-calibrated pull-rope displacement sensor, which has the following beneficial effects:

[0014] (1) When the present invention winds up the steel wire rope, the operation of the constant force spring in the constant force spring bottom cover assembly will drive the rotating shaft to rotate in the opposite direction, and will drive the shaft wheel to rotate synchronously, and the steel wire rope will be wound around the shaft wheel. The steel wire rope wound around the shaft wheel is squeezed and positioned by the squeezing column, and will be driven to be wound around the shaft wheel in sequence, thereby preventing the steel wire rope from being stacked and wound around the shaft wheel.

[0015] (2) After the steel wire rope is wound around the shaft wheel, the arc-shaped triangular groove on the shaft wheel will rotate to the arc-shaped triangular block, and the inclined surface of the arc-shaped triangular block will squeeze the inclined surface on the arc-shaped triangular groove, thereby controlling the rotation of the shaft wheel and driving the arc-shaped triangular block to be completely stored in the arc-shaped triangular groove. The rotation angle of the shaft wheel can be automatically reset, and the automatic calibration of the rope-pull type displacement sensor can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the overall explosion structure of the present invention;

[0018] Figure 3 It is one of the partial cross-sectional explosion structure schematic diagrams of the present invention;

[0019] Figure 4 This is the second schematic diagram of the partial cross-section explosion structure of the present invention;

[0020] Figure 5 It is a partial cross-sectional structural schematic diagram of the present invention;

[0021] In the figure: 1. sensor body; 2. rotating shaft; 3. rotating shaft; 4. shaft wheel; 5. wire draw box housing; 6. constant force spring bottom cover assembly; 7. wire rope; 8. extrusion column; 9. rotating groove; 10. arc-shaped triangular groove; 11. arc-shaped triangular block; 12. first slide bar; 13. first spring; 14. supporting shaft; 15. positioning ring groove; 16. positioning rod; 17. threaded groove; 18. second sleeve; 19. second slide bar; 20. second spring; 21. mounting head; 22. first sleeve. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] The present invention provides a technical solution: Figures 1 to 5As shown, in this embodiment, a self-calibrated pull-wire displacement sensor includes a sensor body 1, a rotating shaft 2 is rotatably mounted in the middle of the sensor body 1 through a bearing, the rotating shaft 2 is fixedly connected to the sensing component inside the sensor body 1, a rotating shaft 3 is fixedly mounted in the middle of the rotating shaft 2 through bolts, a shaft wheel 4 is fixedly mounted on the outer side of the rotating shaft 3 through bolts, a wire box housing 5 is fixedly mounted on one end of the sensor body 1 through bolts, the shaft wheel 4 is arranged inside the wire box housing 5, and one side of the wire box housing 5 is fixedly mounted through a bolt. A constant force spring bottom cover assembly 6 is fixedly installed with bolts, the end of the rotating shaft 2 is clamped with the constant force spring bottom cover assembly 6, the rotating shaft 2 is clamped with the constant force spring assembly in the constant force spring bottom cover assembly 6, a steel wire rope 7 is fixedly installed in the middle of the shaft wheel 4, the steel wire rope 7 is wound around the shaft wheel 4, the steel wire rope 7 passes through the outer shell of the wire draw box housing 5, an extrusion column 8 is installed in the middle of the outer ring of the shaft wheel 4, the extrusion column 8 is movably connected to the wire draw box housing 5, the extrusion column 8 is in extrusion contact with the steel wire rope 7, a rotation groove 9 is opened in the middle of one side of the shaft wheel 4, the shaft wheel 4 An arc-shaped triangular groove 10 is provided at the inner position corresponding to the rotating groove 9, and an arc-shaped triangular block 11 is installed at the position corresponding to the arc-shaped triangular groove 10 on the inner wall of the wire drawing box housing 5. The arc-shaped triangular block 11 is connected with the arc-shaped triangular groove 10, and the mounting head 21 is fixed on the moving component, and the signal output line of the sensor body 1 is connected to the receiver. When the wire rope 7 is wound, the operation of the constant force spring in the constant force spring bottom cover component 6 will drive the rotating shaft 2 to rotate in the opposite direction, and will drive the shaft wheel 4 to rotate synchronously, and the wire rope 7 will be wound on the shaft wheel 4, and the winding will be tightened by the extrusion column 8. The extrusion positioning of the steel wire rope 7 wound on the shaft wheel 4 will drive the steel wire rope 7 to be wound on the shaft wheel 4 in sequence, preventing the steel wire rope 7 from being stacked and wound on the shaft wheel 4. After the steel wire rope 7 is wound on the shaft wheel 4, the arc-shaped triangular groove 10 on the shaft wheel 4 will rotate to the arc-shaped triangular block 11, and the inclined surface of the arc-shaped triangular block 11 will squeeze the inclined surface on the arc-shaped triangular groove 10, which will control the rotation of the shaft wheel 4 and drive the arc-shaped triangular block 11 to be completely stored in the arc-shaped triangular groove 10. The rotation angle of the shaft wheel 4 can be automatically reset, and the automatic calibration of the rope-type displacement sensor can be realized.

[0024] like Figures 1 to 5 As shown, a first sleeve 22 is symmetrically fixedly installed on the inner wall in the middle of the top end of the pull box shell 5, a first slide bar 12 is fixedly installed in the middle of the extrusion column 8 corresponding to the position of the first sleeve 22, the first slide bar 12 is slidably connected to the first sleeve 22, and a first spring 13 is fixedly installed on one end of the first slide bar 12 away from the extrusion column 8, and the end of the first spring 13 away from the first slide bar 12 is fixedly connected to the inner wall of the bottom end of the first sleeve 22.

[0025] When assembling the device, fix the rotating shaft 3 to the rotating shaft 2 with bolts, push the extrusion column 8, and drive the first slide rod 12 connected to the extrusion column 8 to slide inside the first sleeve 22. At this time, the first spring 13 is in a compressed state. Then, put the shaft wheel 4 on the rotating shaft 3 and fix it on the rotating shaft 3 with bolts, which is used to facilitate the assembly of the wire pulling box housing 5 and the positioning assembly of the extrusion column 8 on the shaft wheel 4.

[0026] like Figures 1 to 5 As shown, a support shaft 14 is fixedly installed at the center axis of the extrusion column 8 , and a positioning ring groove 15 is opened in the middle of the outer ring of the shaft wheel 4 , and the positioning ring groove 15 is arranged in rolling contact with the support shaft 14 .

[0027] When positioning and assembling the extrusion column 8 and the shaft wheel 4, the first slide rod 12 is pushed by the first spring 13 to slide inside the first sleeve 22, and the support shaft 14 on the extrusion column 8 is squeezed onto the positioning ring groove 15 of the outer ring of the shaft wheel 4, so that the relative position of the extrusion column 8 and the shaft wheel 4 can be controlled.

[0028] like Figures 1 to 5 As shown, the distance between the lowest end of the extrusion column 8 and the lowest end of the middle part of the shaft wheel 4 is equal to the diameter of the wire rope 7.

[0029] The extrusion column 8 is used to stably extrude the steel wire rope 7 wound on the shaft wheel 4.

[0030] like Figures 1 to 5 As shown, a positioning rod 16 is rotatably installed inside the wire pull box housing 5 at the outlet position corresponding to the wire rope 7. A thread groove 17 is provided on the outer ring of the positioning rod 16. The wire rope 7 is arranged inside the thread groove 17. The positioning rod 16 can rotate due to the compression of the wire rope 7.

[0031] When the steel wire rope 7 is released and wound up, the steel wire rope 7 will be located inside the thread groove 17 , and the thread groove 17 will be squeezed and supported by the steel wire rope 7 at different positions during the release and winding process.

[0032] like Figures 1 to 5 As shown, a second sleeve 18 is symmetrically fixedly installed on the inner wall of one side of the wire pull box shell 5, and a second slide bar 19 is symmetrically fixedly installed on one side of the arc-shaped triangular block 11. The second slide bar 19 is slidably connected to the second sleeve 18, and a second spring 20 is fixedly installed on one end of the second slide bar 19 away from the arc-shaped triangular block 11. The end of the second spring 20 away from the second slide bar 19 is fixedly connected to the inner wall of the bottom end of the second sleeve 18.

[0033] The second spring 20 pushes the second slide bar 19 to move the arcuate triangular block 11 , which in turn drives the arcuate triangular block 11 to stably squeeze the arcuate triangular groove 10 , so as to completely accommodate the arcuate triangular block 11 inside the arcuate triangular groove 10 .

[0034] like Figures 1 to 5 As shown, the second sleeve 18 is arranged at the rotation track of the rotating groove 9.

[0035] The positions of the second slide bar 19 and the second sleeve 18 can be stored.

[0036] like Figures 1 to 5 As shown, a mounting head 21 is movably mounted at the end of the steel wire rope 7, and a through hole is provided at one end of the mounting head 21. The steel wire rope 7 can be inserted into the through hole at the end of the mounting head 21, and the steel wire rope 7 can be fixed by a fastening bolt installed on the mounting head 21. The end of the mounting head 21 can be flat or have other styles such as threads, which can facilitate the installation of the mounting head 21.

[0037] The present invention provides a self-calibrated pull-rope displacement sensor, the specific working principle of which is as follows:

[0038] When the device is in use and assembled, the rotating shaft 3 is fixed to the rotating shaft 2 with bolts, and the extrusion column 8 is pushed, which will drive the first slide bar 12 connected to the extrusion column 8 to slide inside the first sleeve 22. At this time, the first spring 13 is in a compressed state, and then the shaft wheel 4 is sleeved on the rotating shaft 3 and fixed to the rotating shaft 3 with bolts. The push of the first spring 13 on the first slide bar 12 will drive the first slide bar 12 to slide inside the first sleeve 22, and drive the support shaft 14 on the extrusion column 8 to be squeezed on the positioning ring groove 15 of the outer ring of the shaft wheel 4. Then, the wire drawing box housing 5 is fixed to one end of the sensor body 1 with bolts, and then the constant force spring bottom cover assembly 6 is fixed to one side of the wire drawing box housing 5 with bolts, and the rotating shaft 3 and the constant force spring bottom cover assembly 6 are clamped at the end of the constant force spring;

[0039] When in use, the mounting head 21 is fixed on the moving assembly, and the signal output line of the sensor body 1 is connected to the receiver. The movement of the moving assembly will pull the wire rope 7, which will drive the wire rope 7 to be released from the shaft wheel 4, and is used to measure the moving distance of the object. When the wire rope 7 is wound, the operation of the constant force spring in the constant force spring bottom cover assembly 6 will drive the rotating shaft 2 to rotate in the opposite direction, and will drive the shaft wheel 4 to rotate synchronously, and the wire rope 7 will be wound on the shaft wheel 4. The extrusion column 8 squeezes and positions the wire rope 7 wound on the shaft wheel 4, which will drive the wire rope 7 to be wound on the shaft wheel 4 in turn, and prevents the wire rope 7 from being stacked and wound on the shaft wheel 4.

[0040] After the wire rope 7 is wound around the shaft wheel 4, the arc-shaped triangular groove 10 on the shaft wheel 4 will rotate to the arc-shaped triangular block 11, and the second spring 20 will push the second slide bar 19 to drive the arc-shaped triangular block 11 to move, and the inclined surface of the arc-shaped triangular block 11 will squeeze the inclined surface on the arc-shaped triangular groove 10, which will drive the arc-shaped triangular block 11 to be completely stored in the arc-shaped triangular groove 10, so that the rotation angle of the shaft wheel 4 can be automatically reset, and the automatic calibration of the rope-type displacement sensor can be realized.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-calibrated pull-wire displacement sensor, comprising a sensor body (1), a rotating shaft (2) being installed in the middle of the sensor body (1), a rotating shaft (3) being fixedly installed in the middle of the rotating shaft (2), an axle wheel (4) being fixedly installed on the outer side of the rotating shaft (3), a wire box housing (5) being fixedly installed at one end of the sensor body (1), the axle wheel (4) being arranged inside the wire box housing (5), a constant force spring bottom cover assembly (6) being fixedly installed on one side of the wire box housing (5), an end of the rotating shaft (2) being clamped with the constant force spring bottom cover assembly (6), a steel wire rope (7) being fixedly installed in the middle of the axle wheel (4), the steel wire rope (7) being arranged through the outer shell of the wire box housing (5), characterized in that: An extrusion column (8) is installed in the middle of the outer ring of the shaft wheel (4), and the extrusion column (8) is in extrusion contact with the wire rope (7). A rotation groove (9) is opened in the middle of one side of the shaft wheel (4), and an arc-shaped triangular groove (10) is opened in the shaft wheel (4) at an internal position corresponding to the rotation groove (9). An arc-shaped triangular block (11) is installed on the inner wall of the wire drawing box housing (5) at a position corresponding to the arc-shaped triangular groove (10), and the arc-shaped triangular block (11) is clamped with the arc-shaped triangular groove (10).

2. The self-calibrating pull-wire displacement sensor according to claim 1, characterized in that: A first sleeve (22) is symmetrically fixedly installed on the middle inner wall of the wire pulling box housing (5); a first sliding rod (12) is fixedly installed at a position corresponding to the first sleeve (22) in the middle of the extrusion column (8); the first sliding rod (12) is slidably connected to the first sleeve (22); a first spring (13) is fixedly installed at one end of the first sliding rod (12) away from the extrusion column (8); and one end of the first spring (13) away from the first sliding rod (12) is fixedly connected to the bottom inner wall of the first sleeve (22).

3. The self-calibrating pull-wire displacement sensor according to claim 2, characterized in that: A support shaft (14) is fixedly mounted in the middle of the extrusion column (8), and a positioning ring groove (15) is provided in the middle of the outer ring of the shaft wheel (4), and the positioning ring groove (15) is arranged in rolling contact with the support shaft (14).

4. The self-calibrating pull-wire displacement sensor according to claim 3, characterized in that: The distance between the lowest end of the squeezing column (8) and the lowest end of the middle part of the shaft wheel (4) is equal to the diameter of the steel wire rope (7).

5. The self-calibrated pull-wire displacement sensor according to claim 2, characterized in that: A positioning rod (16) is rotatably mounted inside the wire box housing (5) at a position corresponding to the outlet of the steel wire rope (7). The outer ring of the positioning rod (16) is provided with a thread groove (17), and the steel wire rope (7) is arranged inside the thread groove (17).

6. The self-calibrating pull-wire displacement sensor according to claim 5, characterized in that: A second sleeve (18) is symmetrically fixedly mounted on the inner wall of one side of the wire draw box housing (5); a second slide bar (19) is symmetrically fixedly mounted on one side of the arc-shaped triangular block (11); the second slide bar (19) is slidably connected to the second sleeve (18); a second spring (20) is fixedly mounted on one end of the second slide bar (19) away from the arc-shaped triangular block (11); and an end of the second spring (20) away from the second slide bar (19) is fixedly connected to the inner wall of the bottom end of the second sleeve (18).

7. The self-calibrating pull-wire displacement sensor according to claim 6, characterized in that: The second sleeve (18) is arranged at the rotation track of the rotating groove (9).

8. The self-calibrating pull-wire displacement sensor according to claim 5, characterized in that: A mounting head (21) is movably mounted on the end of the steel wire rope (7).

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