Stay wire type displacement sensor

Abstract

The utility model discloses a stay wire type displacement sensor, which belongs to the technical field of sensors, and adopts the technical scheme that the stay wire type displacement sensor comprises a reel, a coil spring for driving the reel to reset, an encoder, a stay wire wound on the reel and a stay wire connecting piece connected with the stay wire, and is characterized in that a driving wheel is arranged on a shaft of the reel; the encoder is rotationally arranged on the machine shell, a driven wheel is arranged on a rotating shaft of the encoder, and speed reduction transmission is achieved between the driving wheel and the driven wheel. The beneficial effects of the utility model are that the speed of the encoder is reduced through the gear assembly, the influence of high-speed vibration on the encoder is reduced, the rotating speed of the encoder is always lower than that of the reel, the relative rotating speed of the encoder is low, and the service life of the encoder is prolonged; and friction between the stay wire and the inner wall of the machine shell can be avoided, the movement direction of the stay wire is guided, the winding wheel is of a special structural design, and the overall strength of the winding wheel is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and particularly relates to a wire-drawing type displacement sensor. Background Art

[0002] A wire displacement sensor is a sensor used to measure the linear displacement or movement of an object. It consists of a stretchable stainless steel rope wound around a wheel, which is connected to a precision rotary sensor, which is generally an encoder. For example, the patent with application number "CN201220320322.0" discloses a wire displacement encoder, which is directly connected to the winding wheel so that the encoder and the winding wheel have the same rotation speed. In this way, when the wheel rotates at high speed, the encoder has a large vibration amplitude that affects the measurement accuracy, and long-term high-speed rotation will reduce the service life of the encoder. Utility Model Content

[0003] The utility model aims to provide a continuous-wire displacement sensor with a deceleration structure arranged between an encoder and a winding wheel.

[0004] The utility model is realized through the following measures: a wire-drawing displacement sensor, comprising a winding wheel, a coil spring for driving the winding wheel to reset, an encoder, a wire drawn around the winding wheel, and a wire-drawing connector connected to the wire drawn, characterized in that a driving wheel is arranged on the shaft of the winding wheel, the encoder is rotatably arranged on the casing and a driven wheel is arranged on the rotating shaft of the encoder, a reduction transmission is arranged between the driving wheel and the driven wheel, and the speed of the encoder is made smaller than the speed of the winding wheel through the reduction transmission, thereby reducing the influence of vibration on the measurement accuracy at high speed.

[0005] Furthermore, the driving wheel and the driven wheel are mutually meshing gears, and sprockets or toothed belt wheels may also be used. To ensure measurement accuracy, gears are preferred.

[0006] Furthermore, a plurality of guide wheels are arranged on the housing and outside the winding wheel, and the pulling wire on the winding wheel is located between the guide wheels and the winding wheel.

[0007] Further, the housing comprises an upper partition and a lower partition which are parallel to each other, the winding wheel is arranged between the two partitions, the encoder is located above the upper partition, and the coil spring is located below the lower partition;

[0008] The axis of the winding wheel rotates on the partition and the driving wheel is arranged on the upper end of the axis. The driving wheel is located above the upper partition. A driven wheel is rotatably arranged on the upper partition. The rotating shaft of the encoder is concentrically fixedly connected with the driven wheel. The axis of the winding wheel and the partition are rotatably connected through bearings and generally bearings are arranged on both partitions.

[0009] Furthermore, a plurality of guide wheels are arranged between the two partitions and on the outside of the winding wheel. The wire of the winding wheel is located between the winding wheel and the guide wheels to ensure the stability of the wire pulling direction and avoid deflection and friction with the casing. An annular groove cooperating with the wire pulling is arranged on the guide wheel.

[0010] Furthermore, the casing also includes a protective plate connected around the upper partition and the lower partition, and a mounting hole is opened on any of the protective plates. A pull wire connector is arranged in the mounting hole, and the inner end of the pull wire connector is fixedly connected to the pull wire.

[0011] Furthermore, the housing also includes an upper protective cover fixedly arranged on the upper partition plate and located at the periphery of the encoder, the upper protective cover is provided with a data output port, and a transmission line electrically connected to the encoder is arranged in the data output port.

[0012] Furthermore, the housing further comprises a lower protective cover fixedly arranged on the lower partition and located outside the coil spring, the lower end of the shaft of the winding wheel extends out of the lower partition and is connected to the coil spring. The lower end of the shaft of the winding wheel is provided with a U-shaped groove for installing the coil spring, and the inner end of the coil spring is fixed in the U-shaped groove.

[0013] Furthermore, the winding wheel includes a central sleeve and an outer winding drum, the central sleeve and the outer winding drum are connected by an inner support plate, the central sleeve is sleeved on the shaft of the winding wheel and is fixedly connected to the shaft of the winding wheel. Outer folding baffles are provided on the outer edges of the upper and lower ends of the outer winding drum. The outer folding baffles are used to limit the pull wire wound on the outer winding drum to prevent it from falling off. The central sleeve, the outer winding drum and the support plate increase the overall strength of the winding wheel.

[0014] Furthermore, a mounting platform is provided on the upper partition, and a mounting cavity for the driving wheel and the driven wheel is provided in the mounting platform. The mounting platform and the upper partition are connected in a detachable manner and a sealing ring is provided at the connection.

[0015] Furthermore, it also includes a support plate of the encoder, and the support plate is fixedly arranged on the mounting platform or the upper partition.

[0016] Furthermore, the upper protective cover, the lower protective cover and the protective plate are all connected to the partition in a detachable manner.

[0017] Working principle: This sensor is suitable for detecting any A and B surfaces that need to measure relative displacement. By fixing the wire connector to the A surface and the housing to the B surface, when the A surface is displaced relative to the B surface, the wire connector pulls the wire to drive the winding wheel to rotate, and then drives the encoder to rotate through the reduction gear. The encoder converts the received physical displacement information into an electrical signal (such as an RS485 signal) and outputs it through the communication interface on the encoder through the transmission line.

[0018] The technical solution provided by the embodiment of the utility model has the following beneficial effects: the speed of the encoder is reduced by the gear assembly, thereby reducing the influence of vibration on the encoder at high speed; the rotation speed of the encoder is always lower than that of the winding wheel, and the relative rotation speed of the encoder is low, thereby extending the service life of the encoder; a number of guide wheels are arranged on the periphery of the winding wheel to avoid friction between the pull wire and the inner wall of the casing and to guide the movement direction of the pull wire; the winding wheel adopts a special structural design to improve the overall strength of the winding wheel; the encoder, winding wheel and coil spring are arranged in sequence from top to bottom, and the structure is compact; the casing is divided into three areas by upper and lower partitions and can be disassembled, which is convenient for later maintenance and repair; a mounting table is arranged in the upper protective cover, and the mounting table can realize the driven wheel and the driving wheel The installation, together with the sealing ring, can play a waterproof role, and avoid the poor connection between the detachable upper protective cover and the upper partition, which may cause water ingress and affect the gears; due to the simple structure and the use of mature technology, the equipment cost is relatively low, and the operating cost and management difficulty are greatly reduced; it has a wide range of applications and can be effectively used for position detection of various irregular planes and opposite surfaces, and performs particularly well in occasions requiring high filtering effects, and occupies a small space; it is suitable for a variety of mechanical equipment, including but not limited to linear guide systems, hydraulic cylinder systems, testing machines, various telescopic systems, cranes, reservoir dam protection systems, gate opening control systems, etc., which can realize position detection and control, and can even replace grating rulers in some cases to achieve low-cost measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present utility model, a brief introduction will be given to the drawings used in the embodiments below. Obviously, the drawings listed below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of the internal structure of the housing, the mounting platform, the winding wheel and the coil spring after being cut open in the embodiment of the utility model;

[0022] Figure 3 It is a schematic diagram of the structure of the embodiment of the utility model with part of the housing removed;

[0023] Figure 4 It is a schematic diagram of the structure of the winding wheel in the embodiment of the utility model;

[0024] Figure 5 It is a structural diagram of the shaft and coil spring of the winding wheel in the embodiment of the utility model.

[0025] In the accompanying drawings, the list of components represented by each number is as follows: 1. Casing; 2. Wire connecting piece; 3. Winding wheel; 4. Encoder; 5. Coil spring; 6. Driving wheel; 8. Driven wheel; 9. Mounting table; 10. Guide wheel; 11. Sealing ring; 12. Support plate; 101. Upper partition; 102. Lower partition; 103. Protective plate; 104. Upper protective cover; 105. Lower protective cover; 10301. Data output port; 301. Center sleeve; 302. External winding drum; 303. Inner support plate; 304. External folding baffle; 305. Shaft of winding wheel; 30501. U-shaped groove; 901. Mounting cavity. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. Of course, the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] See also Figure 1-Figure 5 A wire-drawing displacement sensor comprises a winding wheel 3, a coil spring 5 for driving the winding wheel 3 to reset, an encoder 4, a wire drawn around the winding wheel 3, and a wire-drawing connector 2 connected to the wire drawn. The sensor is characterized in that a driving wheel 6 is arranged on the shaft 305 of the winding wheel, the encoder 4 is rotatably arranged on the housing 1, and a driven wheel 8 is arranged on the rotating shaft of the encoder 4. A reduction transmission is arranged between the driving wheel 6 and the driven wheel 8. The speed of the encoder 4 is made smaller than the speed of the winding wheel 3 through the reduction transmission, thereby reducing the influence of vibration on the measurement accuracy at high speed.

[0028] The driving wheel 6 and the driven wheel 8 are mutually meshing gears, and sprockets or toothed belt wheels may also be used. To ensure measurement accuracy, gears are preferred.

[0029] A plurality of guide wheels 10 are arranged on the casing 1 and outside the winding wheel 3 , and the pulling wire on the winding wheel 3 is located between the guide wheels 10 and the winding wheel 3 .

[0030] The housing 1 includes an upper partition 101 and a lower partition 102 which are parallel to each other, the winding wheel 3 is arranged between the two partitions, the encoder 4 is located above the upper partition 101, and the coil spring 5 is located below the lower partition 102;

[0031] The shaft 305 of the winding wheel rotates on the partition and a driving wheel 6 is arranged at the upper end of the shaft, and the driving wheel 6 is located above the upper partition 101. A driven wheel 8 is rotatably arranged on the upper partition 101, and the rotating shaft of the encoder 4 is concentrically fixedly connected with the driven wheel 8. The shaft 305 of the winding wheel and the partition are rotatably connected through bearings, and generally, bearings are arranged on both partitions.

[0032] A number of guide wheels 10 are arranged between the two partitions and on the outside of the winding wheel 3. The wire of the winding wheel 3 is located between the winding wheel 3 and the guide wheels 10 to ensure the stability of the wire pulling direction and avoid deflection and friction with the outer shell of the casing 1. An annular groove cooperating with the wire pulling is arranged on the guide wheel 10.

[0033] The housing 1 further comprises a protective plate 103 connected around the upper partition 101 and the lower partition 102. A mounting hole is opened on any protective plate 103. A pull wire connector 2 is arranged in the mounting hole. The inner end of the pull wire connector 2 is fixedly connected to the pull wire.

[0034] The housing 1 further comprises an upper protective cover 104 fixedly arranged on the upper partition plate 101 and located at the periphery of the encoder 4 . The upper protective cover 104 is provided with a data output port 10301 . A transmission line electrically connected to the encoder 4 is arranged in the data output port 10301 .

[0035] The housing 1 further includes a lower protective cover 105 fixedly arranged on the lower partition 102 and located at the periphery of the coil spring 5. The lower end of the winding wheel shaft 305 extends out of the lower partition 102 and is connected to the coil spring 5. The lower end of the winding wheel shaft 305 is provided with a U-shaped groove 30501 for installing the coil spring 5, and the inner end of the coil spring 5 is fixed in the U-shaped groove 30501.

[0036] The winding wheel 3 includes a central sleeve 301 and an outer winding drum 302, and the central sleeve 301 and the outer winding drum 302 are connected by an inner support plate 303. The central sleeve 301 is sleeved on the shaft 305 of the winding wheel and is fixedly connected to the shaft 305 of the winding wheel. The outer edges of the upper and lower ends of the outer winding drum 302 are both provided with outer folding baffles 304. The outer folding baffles 304 are used to limit the pull line wound on the outer winding drum 302 to prevent it from falling off. The central sleeve 301, the outer winding drum 302 and the support plate 12 increase the overall strength of the winding wheel 3.

[0037] A mounting platform 9 is provided on the upper partition 101 , and a mounting cavity 901 for the driving wheel 6 and the driven wheel 8 is provided in the mounting platform 9 . The mounting platform 9 and the upper partition 101 are detachably connected and a sealing ring 11 is provided at the connection.

[0038] It also includes a support plate 12 of the encoder 4 , which is fixedly disposed on the mounting platform 9 or the upper partition plate 101 .

[0039] The upper protective cover 104, the lower protective cover 105 and the protective plate 103 are all connected to the partition in a detachable manner.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wire-drawing displacement sensor, comprising a winding wheel, a coil spring for driving the winding wheel to reset, an encoder, a wire wound on the winding wheel, and a wire connecting member connected to the wire, characterized in that: A driving wheel is arranged on the shaft of the winding wheel, the encoder is rotatably arranged on the housing and a driven wheel is arranged on the rotating shaft of the encoder, and a reduction transmission is arranged between the driving wheel and the driven wheel.

2. The wire-type displacement sensor according to claim 1, characterized in that: The driving wheel and the driven wheel are gears meshing with each other.

3. The wire-type displacement sensor according to claim 1, characterized in that: A plurality of guide wheels are arranged on the casing and outside the winding wheel, and the pulling wire on the winding wheel is located between the guide wheels and the winding wheel.

4. The wire-type displacement sensor according to claim 1, characterized in that: The housing comprises an upper partition and a lower partition which are parallel to each other, the winding wheel is arranged between the two partitions, the encoder is located above the upper partition, and the coil spring is located below the lower partition; The shaft of the winding wheel rotates on the partition and the driving wheel is arranged on the upper end of the shaft. The driving wheel is located above the upper partition. A driven wheel is rotatably arranged on the upper partition. The rotating shaft of the encoder is fixedly connected concentrically with the driven wheel.

5. The wire-type displacement sensor according to claim 4, characterized in that: A plurality of guide wheels are arranged between the two partitions and on the outer side of the winding wheel, and the line of the winding wheel is located between the winding wheel and the guide wheels.

6. The wire-type displacement sensor according to claim 4, characterized in that: The housing also includes a protective plate connected to the upper partition and the lower partition around, any of the protective plates is opened with a mounting hole, a pull wire connector is arranged in the mounting hole, and the inner end of the pull wire connector is fixedly connected to the pull wire.

7. The wire-type displacement sensor according to claim 4, characterized in that: The housing further comprises an upper protective cover fixedly arranged on the upper partition plate and located at the periphery of the encoder, the upper protective cover is provided with a data output port, and a transmission line electrically connected to the encoder is arranged in the data output port.

8. The wire-type displacement sensor according to claim 4, characterized in that: The housing also includes a lower protective cover fixedly arranged on a lower partition and located at the periphery of the coil spring. The lower end of the shaft of the winding wheel extends out of the lower partition and is connected to the coil spring.

9. The wire-type displacement sensor according to claim 4, characterized in that: The winding wheel comprises a central sleeve and an outer winding drum, wherein the central sleeve and the outer winding drum are connected via an inner support plate, and the central sleeve is sleeved on the shaft of the winding wheel and fixedly connected to the shaft of the winding wheel.

10. The wire-type displacement sensor according to claim 4, characterized in that: The upper partition is provided with a mounting platform, and a mounting cavity for the driving wheel and the driven wheel is provided in the mounting platform. The mounting platform and the upper partition are connected in a detachable manner and a sealing ring is provided at the connection.

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