Pull rope type dual-redundancy linear displacement sensor with independent dual-signal output

Abstract

The utility model discloses an independent double signal output stay rope type dual redundancy linear displacement sensor, which comprises a shell, two cover plates, two rotating shafts, a stay rope transmission assembly and a detection assembly, the two cover plates are respectively arranged at the two ends of the shell, the two rotating shafts are respectively arranged at the two ends of the shell, and the two rotating shafts are respectively arranged at the two ends of the shell. The two rotating shafts with the coincident center lines are installed in the shell through bearings respectively and are close to the two ends of the shell respectively, the two rotating shafts are close to each other, and the two pull rope transmission assemblies arranged in the shell are connected with the ends, close to the corresponding ends of the shell, of the two rotating shafts respectively; and the two detection assemblies arranged in the shell are respectively connected with the two rotating shafts. According to the utility model, the two rotating shafts, the two pull rope transmission assemblies and the two detection assemblies are integrated in the housing, and the same sensor is utilized to realize an independent detection function of linear displacement of two different moving parts.

Description

Technical Field

[0001] The utility model relates to a dual-redundancy linear displacement sensor, in particular to a cable-pulling type dual-redundancy linear displacement sensor with independent dual-signal output. Background Art

[0002] Linear displacement sensors are widely used in various occasions for linear motion position feedback. The most common linear displacement sensors include slide-stem type linear displacement sensors and pull-rod type linear displacement sensors. The moving parts of the equipment to be detected drive the brush holder and brush (or magnet holder and magnet, etc.) to move through the slide stem or pull rod, so as to achieve the purpose of detecting the linear displacement amount. The transmission structure of this kind of linear displacement sensor is a hard connection structure, and the linear displacement amount of the slide stem and pull rod is the linear displacement amount of the moving part of the equipment to be detected.

[0003] In practical applications, linear displacement sensors will be improved according to needs to meet actual application requirements. Among them, dual-redundancy signal output and large-distance non-linear connection are two very common actual application requirements. Dual-redundancy signal output is to meet the application requirements of improving detection accuracy (the detection accuracy can be improved by comparing and averaging the two output signals) or increasing service life (the two groups of detection elements can use one group as a backup, and can still be used after some elements are damaged, thus increasing the service life). The linear displacement sensor with dual-redundancy signal output is the dual-redundancy linear displacement sensor; large-distance non-linear connection is to meet the detection requirements of achieving large-distance movement in a relatively narrow space and the moving part cannot be linearly connected to the sensor. It is very difficult for the traditional hard connection structure of the slide stem and pull rod to meet this kind of application requirement. For example, in aerospace equipment, it is required that all components should achieve high precision, long life, miniaturization and light weight as much as possible. When the linear displacement sensor is applied to the cab operating system of aerospace equipment, the above two application requirements exist at the same time, so as to detect the movement stroke of components such as brakes and joysticks.

[0004] For traditional dual-redundancy linear displacement sensors, generally two groups of detection elements are combined with the same transmission part (such as a slide stem or a pull rod) to achieve the purpose of dual-redundancy signal output, and are used to realize the detection function of the linear displacement of a moving part. The following defects exist: the independent detection function of the linear displacements of two different moving parts cannot be realized, and it is difficult to meet the actual application requirements of special scenarios, such as the linear displacement detection functions of the two sets of operating systems of the main and co-pilots of an aircraft cannot be met.

[0005] For the application requirements of non-linear connection at large distances, there are many traditional solutions. Among them, the solution that can best meet the requirements of a large distance between the moving part and the sensor and the inability to connect linearly is to use a pull rope in combination with a traditional linear displacement sensor or angular displacement sensor to form a pull rope linear displacement sensor. Using a pull rope in combination with an angular displacement sensor to form a pull rope linear displacement sensor is more conducive to long-distance detection and product miniaturization. Among the traditional pull rope linear displacement sensors formed by combining a pull rope with an angular displacement sensor, the utility model patent with the patent number "2017208848107" and the name "Sensor with large working stroke and small volume" is the closest prior art. However, this utility model has the following defects: the stress of the torsion spiral spring needs to be adjusted by rotating the cover plate. This adjustment method is limited by the connection structure between the cover plate and the housing, is inconvenient to adjust, and it is difficult to achieve an arbitrary multi-stage adjustment function. Utility Model Content

[0006] The purpose of the present utility model is to provide a pull rope type dual-redundancy linear displacement sensor with independent dual-signal output that can realize the independent detection function of two moving parts in order to solve the above problems.

[0007] The present utility model realizes the above purpose through the following technical solutions:

[0008] A pull rope type dual-redundancy linear displacement sensor with independent dual-signal output, including a housing, a cover plate, a rotating shaft, a pull rope transmission assembly, and a detection assembly. There are two cover plates, and the two cover plates are respectively installed at both ends of the housing. There are two rotating shafts, and the two rotating shafts with coincident centerlines are respectively installed in the housing through bearings and are respectively close to both ends of the housing. The two rotating shafts are close to each other. The two pull rope transmission assemblies placed in the housing are respectively connected to one end of the two rotating shafts close to the corresponding ends of the housing, and the two detection assemblies placed in the housing are respectively connected to the two rotating shafts.

[0009] Preferably, in order to facilitate the realization of the pulling rope transmission function and the multi-stage elastic force adjustment function of the torsion spiral spring, the pulling rope transmission assembly includes a pulling rope, a torsion disc, a torsion spiral spring and a spring fixing plate. The inner wall of the circular torsion disc is connected to the end of the corresponding rotating shaft. A circular groove is provided on the circumferential outer wall surface of the torsion disc. The inner end of the pulling rope is connected to the groove wall of the circular groove of the torsion disc. The outer end of the pulling rope passes through the corresponding through hole on the housing and is placed outside the housing. The central end of the torsion spiral spring is connected to the end of the corresponding rotating shaft. The outer peripheral end of the torsion spiral spring is connected to the circular spring fixing plate. The torsion spiral spring is located between the inner wall of the spring fixing plate and the outer wall of the corresponding rotating shaft. A plurality of mounting grooves are respectively provided on the circumferential inner walls at both ends of the housing. The even-numbered mounting grooves at each end are evenly distributed in the circumferential direction. The opposite sides of the spring fixing plate are respectively provided with outwardly protruding mounting parts. The two mounting parts of each spring fixing plate are respectively placed in the corresponding two mounting grooves and are pressed by the corresponding cover plate.

[0010] Preferably, in order to facilitate the connection between the torsion disc and the rotating shaft, on the opposite sides of the end of the rotating shaft connected to the torsion disc, there are respectively provided lugs protruding in the peripheral direction. Connecting through holes are provided on the lugs. Connecting screw holes corresponding to the two lugs are respectively provided at positions near the inner wall of the torsion disc. After the connecting screws pass through the corresponding connecting through holes, they are connected to the corresponding connecting screw holes.

[0011] Preferably, in order to facilitate the connection of the torsion spiral spring, the central end of the torsion spiral spring passes through the through hole at the end of the corresponding rotating shaft and is connected to the rotating shaft. The outer peripheral end of the torsion spiral spring passes through the through hole of the corresponding spring fixing plate and is connected to the spring fixing plate.

[0012] Preferably, in order to facilitate processing and assembly, the housing includes a first housing and a second housing. The first end of the two ends of the first housing is connected to the first end of the two ends of the second housing. The second ends of the two ends of the first housing and the second ends of the two ends of the second housing are respectively connected to the two cover plates.

[0013] Preferably, in order to facilitate the installation of the cover plate, cover plate counterbores are respectively provided on the circumferential inner walls at the second ends of the first housing and the second housing. A plurality of the mounting grooves are respectively provided on the circular rings near the inner wall edges at the bottoms of the corresponding cover plate counterbores.

[0014] Preferably, for the convenience of installing the torsion disc, a housing barrel wall integrally formed with the corresponding first housing or the second housing is provided at a position near the corresponding rotating shaft in the inner wall of the first housing and the inner wall of the second housing. An annular space for accommodating the torsion disc is formed between the outer wall of the housing barrel wall and the inner wall of the corresponding first housing or the second housing on the outside. The rotating shaft passes through the central through hole of the corresponding first housing or the second housing, and the bearing is installed between the outer wall of the corresponding rotating shaft and the hole wall of the central through hole of the corresponding first housing or the second housing.

[0015] Preferably, the detection assembly includes a resistor body, an insulating sleeve, a slip ring and a brush. The resistor body is installed in the housing. The two rotating shafts respectively pass through the central through holes of the corresponding resistor bodies. The insulating sleeve is sleeved on the corresponding rotating shaft through its own through hole. The slip ring is sleeved outside the insulating sleeve through its own through hole. The brush is installed on the slip ring and contacts the working band of the corresponding resistor body.

[0016] The beneficial effects of the present utility model are as follows:

[0017] By integrating two rotating shafts, two cable drive assemblies and two detection assemblies in the housing, the present utility model realizes the independent detection function of the linear displacements of two different moving parts by using the same sensor; by adding a spring fixing plate in the cable drive assembly, arranging a plurality of mounting grooves on the circumferential inner walls at both ends of the housing respectively, arranging outwardly convex mounting parts on the opposite sides of the spring fixing plate respectively, and placing the two mounting parts of the spring fixing plate in the corresponding two mounting grooves respectively, the elastic force of the torsion spiral spring can be changed, so as to better control the magnitude of the rotational driving force (i.e., the cable tension) and the reset force of the rotating shaft, which is convenient for application. Description of the Drawings

[0018] Figure 1 is the front cross-sectional view of the cable-type dual-redundancy linear displacement sensor with independent dual-signal output of the present utility model;

[0019] Figure 2 is the left view of the first housing of the cable-type dual-redundancy linear displacement sensor with independent dual-signal output of the present utility model;

[0020] Figure 3 is the left view of the spring fixing plate of the cable-type dual-redundancy linear displacement sensor with independent dual-signal output of the present utility model;

[0021] Figure 4 is the left view of the spring fixing plate, torsion spiral spring and rotating shaft corresponding to the first housing in the cable-type dual-redundancy linear displacement sensor with independent dual-signal output of the present utility model;

[0022] Figure 5 It is a left view of the first housing of the rope-pulling type dual-redundancy linear displacement sensor with independent dual-signal output according to the present utility model, as well as the spring fixing plate, torsion spiral spring, and rotating shaft corresponding to the first housing. Detailed implementation manners

[0023] The present utility model will be further described below with reference to the accompanying drawings:

[0024] As Figures 1 - 5 shown, the rope-pulling type dual-redundancy linear displacement sensor with independent dual-signal output according to the present utility model includes a housing (refer to the first housing 4 and the second housing 14 in the following content), a cover plate 1, a rotating shaft 13, a rope-pulling transmission assembly, and a detection assembly. There are two cover plates 1, and the two cover plates 1 are respectively installed at both ends of the housing. There are two rotating shafts 13, and the two rotating shafts 13 with coincident centerlines (that is, the two rotating shafts 13 are arranged in the same straight line) are respectively installed in the housing through bearings 8 and are respectively close to both ends of the housing. The two rotating shafts 13 are close to each other. The two rope-pulling transmission assemblies placed in the housing are respectively connected to one end of the two rotating shafts 13 close to the corresponding ends of the housing, and the two detection assemblies placed in the housing are respectively connected to the two rotating shafts 13.

[0025] As Figures 1 - 5 shown, the present utility model also discloses the following multiple more optimized specific structures:

[0026] In order to facilitate the realization of the rope-pulling transmission function and the realization of the multi-stage elastic force adjustment function for the torsion spiral spring, the rope-pulling transmission assembly includes a rope 6, a torsion disk 7, a torsion spiral spring 3, and a spring fixing plate 2. The inner wall of the circular torsion disk 7 is connected to the end of the corresponding rotating shaft 13. A circular groove 5 is provided on the circumferential outer wall surface of the torsion disk 7. The inner end (invisible in the figure) of the rope 6 is connected to the groove wall of the circular groove 5 of the torsion disk 7. The outer end (invisible in the figure) of the rope 6 passes through the corresponding through hole (invisible in the figure) on the housing and is placed outside the housing. The central end of the torsion spiral spring 3 is connected to the end of the corresponding rotating shaft 13, and the peripheral end of the torsion spiral spring 3 is connected to the circular spring fixing plate 2. The torsion spiral spring 3 is located between the inner wall of the spring fixing plate 2, that is, the hole wall of the central through hole 22 of the spring fixing plate 2 and the outer wall of the corresponding rotating shaft 13. A plurality of (six in the figure, and more can also be provided) installation grooves 17 (shown as the installation grooves 17 of the first housing 4 in the figure, and the structure of the second housing 14 is the same as that of the first housing 4) are respectively provided on the circumferential inner walls at both ends of the housing. The even-numbered installation grooves 17 at each end are evenly distributed along the circumferential direction. The opposite sides of the spring fixing plate 2 are respectively provided with outwardly convex installation parts 21. The two installation parts 21 of each spring fixing plate 2 are respectively placed in the corresponding two installation grooves 17 and are pressed by the corresponding cover plate 1.

[0027] To facilitate the connection between the torsion disc 7 and the rotating shaft 13, on opposite sides of one end of the rotating shaft 13 connected to the torsion disc 7, there are respectively provided lugs (not marked in the figure) protruding in the peripheral direction. Connecting through holes are provided on the lugs. At positions near the inner wall of the torsion disc 7, there are respectively provided connecting screw holes corresponding to the two lugs. A connecting screw (not marked in the figure) passes through the corresponding connecting through hole and is connected to the corresponding connecting screw hole.

[0028] To facilitate the connection of the torsion spiral spring 3, the central end of the torsion spiral spring 3 passes through the through hole at the end of the corresponding rotating shaft 13 and is connected to the rotating shaft 13, and the peripheral end of the torsion spiral spring 3 passes through the through hole of the corresponding spring fixing plate 2 and is connected to the spring fixing plate 2.

[0029] To facilitate processing and assembly, the housing includes a first housing 4 and a second housing 14. The first end of the two ends of the first housing 4 is connected to the first end of the two ends of the second housing 14, and the second end of the two ends of the first housing 4 and the second end of the two ends of the second housing 14 are respectively connected to the two cover plates 1.

[0030] To facilitate the installation of the cover plate 1, on the inner circumferential walls at the second ends of the first housing 4 and the second housing 14, there are respectively provided cover plate sunk grooves 15 (shown as the cover plate sunk groove 15 of the first housing 4 in the figure, and the structure of the second housing 14 is the same as that of the first housing 4). A plurality of installation grooves 17 are respectively provided on the ring 16 near the inner wall edge at the bottom of the corresponding cover plate sunk groove 15.

[0031] To facilitate the installation of the torsion disc 7, on the inner walls of the first housing 4 and the second housing 14 near the corresponding rotating shafts 13, there are provided housing barrel walls 19 integrally formed with the corresponding first housing 4 or second housing 14 (shown as the housing barrel wall 19 of the first housing 4 in the figure, and the structure of the second housing 14 is the same as that of the first housing 4). An annular space 18 for accommodating the torsion disc 7 is formed between the outer wall of the housing barrel wall 19 and the inner wall of the corresponding first housing 4 or second housing 14 on the outside. The rotating shaft 13 passes through the central through hole 20 of the corresponding first housing 4 or second housing 14 (shown as the central through hole 20 of the first housing 4 in the figure, and the structure of the second housing 14 is the same as that of the first housing 4), and the bearing 8 is installed between the outer wall of the corresponding rotating shaft 13 and the hole wall of the central through hole 20 of the corresponding first housing 4 or second housing 14.

[0032] The detection component includes a resistor body 9, an insulating sleeve 11, a slip ring 12 and a brush 10. The resistor body 9 is installed inside the housing. Two rotating shafts 13 respectively pass through the central through holes of the corresponding resistor bodies 9. The insulating sleeve 11 is sleeved on the corresponding rotating shaft 13 through its own through hole. The slip ring 12 is sleeved outside the insulating sleeve 11 through its own through hole. The brush 10 is installed on the slip ring 12 and contacts the working band of the corresponding resistor body 9.

[0033] As Figures 1 - 5 shown, in application, the outer ends of the ropes 6 of the two rope transmission components are respectively connected to two moving parts. One rotating shaft 13 and the corresponding rope transmission component and detection component are equivalent to jointly forming an independent linear displacement sensor, and the other rotating shaft 13 and the corresponding rope transmission component and detection component are equivalent to jointly forming another independent linear displacement sensor. The two independent linear displacement sensors are both installed inside the housing; when the two moving parts move simultaneously or differently, the corresponding ropes 6 drive the corresponding torsion disks 7 and rotating shafts 13 to rotate synchronously. The two detection components respectively realize the function of detecting the rotation angle, and the independent detection function of the linear displacement of the two moving parts is realized after conventional calculation and processing.

[0034] The above embodiments are only the preferred embodiments of the present invention, and do not limit the technical solutions of the present invention. Any technical solutions that can be achieved on the basis of the above embodiments without creative labor shall be regarded as falling within the scope of the patent rights of the present invention.

Claims

1. A pull-wire type dual-redundancy linear displacement sensor with independent dual signal output, comprising a housing, a cover plate, a rotating shaft, a pull-wire transmission assembly and a detection assembly, characterized in that: The cover plates include two, and the two cover plates are respectively installed at the two ends of the shell. The rotating shafts include two, and the two rotating shafts with overlapping center lines are respectively installed in the shell through bearings and are respectively close to the two ends of the shell. The two rotating shafts are close to each other, and the two pull rope transmission components disposed in the shell are respectively connected to one end of the two rotating shafts close to the corresponding end of the shell, and the two detection components disposed in the shell are respectively connected to the two rotating shafts.

2. The pull-wire type dual-redundancy linear displacement sensor with independent dual signal output according to claim 1 is characterized in that: The pull rope transmission assembly includes a pull rope, a torsion disk, a torsion coil spring and a spring fixing plate. The inner wall of the annular torsion disk is connected to the end of the corresponding rotating shaft, and the circumferential outer wall surface of the torsion disk is provided with an annular groove. The inner end of the pull rope is connected to the groove wall of the annular groove of the torsion disk, and the outer end of the pull rope passes through the corresponding through hole on the outer shell and is placed outside the outer shell. The central end of the torsion coil spring is connected to the end of the corresponding rotating shaft, and the outer end of the torsion coil spring is connected to the annular spring fixing plate. The torsion coil spring is located between the inner wall of the spring fixing plate and the outer wall of the corresponding rotating shaft. The circumferential inner walls at both ends of the outer shell are respectively provided with a plurality of mounting grooves, and the even number of mounting grooves at each end are evenly distributed along the circumferential direction. The opposite sides of the spring fixing plate are respectively provided with convex mounting parts, and the two mounting parts of each spring fixing plate are respectively placed in the corresponding two mounting grooves and pressed by the corresponding cover plate.

3. The pull-wire type dual-redundancy linear displacement sensor with independent dual signal output according to claim 2 is characterized in that: Lugs protruding toward the outer circumference are respectively provided on opposite sides of one end of the rotating shaft connected to the torsion plate, and connecting through holes are provided on the lugs. Connecting screw holes corresponding to the two lugs are respectively provided on the torsion plate near its inner wall, and the connecting screws pass through the corresponding connecting through holes and are connected to the corresponding connecting screw holes.

4. The pull-wire type dual-redundancy linear displacement sensor with independent dual signal output according to claim 2, characterized in that: The central end of the torsion coil spring passes through the corresponding through hole of the end of the rotating shaft to be connected to the rotating shaft, and the outer end of the torsion coil spring passes through the corresponding through hole of the spring fixing plate to be connected to the spring fixing plate.

5. The pull-wire type dual-redundancy linear displacement sensor with independent dual signal output according to any one of claims 2 to 4, characterized in that: The shell includes a first shell and a second shell, the first end of the first shell is connected to the first end of the second shell, and the second end of the first shell and the second end of the second shell are respectively connected to the two cover plates.

6. The pull-wire type dual-redundancy linear displacement sensor with independent dual signal output according to claim 5, characterized in that: The second end circumferential inner wall of the first shell and the second end circumferential inner wall of the second shell are respectively provided with a cover plate recess, and the plurality of mounting grooves are respectively provided on a circular ring close to the inner wall edge in the groove bottom of the corresponding cover plate recess.

7. The pull-wire type dual-redundancy linear displacement sensor with independent dual signal output according to claim 5, characterized in that: An outer shell cylinder wall integrally formed with the corresponding first shell or the corresponding second shell is provided in the inner wall of the first shell and the inner wall of the second shell near the corresponding rotating shaft, an annular space for accommodating the torsion plate is formed between the outer wall of the outer shell cylinder wall and the inner wall of the first shell or the corresponding second shell on the outside, the rotating shaft passes through the central through hole of the corresponding first shell or the second shell, and the bearing is installed between the outer wall of the corresponding rotating shaft and the hole wall of the central through hole of the corresponding first shell or the second shell.

8. The pull-wire type dual-redundancy linear displacement sensor with independent dual signal output according to any one of claims 1 to 4, characterized in that: The detection component includes a resistor, an insulating sleeve, a collector ring and a brush. The resistor is installed in the shell, and the two rotating shafts pass through the corresponding central through holes of the resistor respectively. The insulating sleeve is sleeved on the corresponding rotating shaft through its own through hole, and the collector ring is sleeved outside the insulating sleeve through its own through hole. The brush is installed on the collector ring and contacts with the corresponding working band of the resistor.

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