Transmission structure of pull rope sensor

Abstract

The transmission structure of the pull rope sensor comprises a shell a and a shell b which are in concentric butt joint, a bottom plate is fixedly installed at the lower end of the shell b through bolts, a bearing seat made of metal is arranged in the middle of the shell a, symmetrical steps are arranged at the two ends of an inner cavity of the bearing seat respectively, roller bearings are installed at the steps, and the shell a and the shell b are in concentric butt joint. A vertically-penetrating rotating shaft is fixedly installed on an inner ring of the roller bearing, a wire coil is installed on the lower portion of the rotating shaft and located in an inner cavity of the shell a, a spiral spring is installed at the lower end of the rotating shaft, the outer end of the spiral spring is fixedly connected with the inner wall of the shell b, and a concentric worm is fixedly installed at the upper end of the rotating shaft. A rotatable turbine is installed on the upper side of the shell a, and the worm is meshed with the turbine. The body bearing seat is provided with the metal insert, transmission precision can be improved, precision of the pull rope sensor is further improved, the pull rope is driven by the spiral spring to achieve automatic take-up after being pulled out, and use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of displacement sensors, in particular to a transmission structure of a cable pull sensor. Background Art

[0002] The cable pull sensor is an ingenious structure of a linear displacement sensor, which fully combines the advantages of an angle sensor and a linear displacement sensor, and becomes a sensor with small installation size, compact structure, large measurement stroke and high precision. The stroke ranges from several hundred millimeters to dozens of meters. The bearings on the existing cable pull sensors are directly press-fitted on the plastic housing. Due to the low precision of plastic injection molding, the position precision after installing the bearings is not high, and the rotation precision after the bearings are connected to the rotating shaft is not high, which affects the measurement precision of the cable pull sensor. Content of the Utility Model

[0003] The purpose of the utility model is to provide a transmission structure of a cable pull sensor to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: a transmission structure of a cable pull sensor, including concentrically butt-connected housing a and housing b. A bottom plate is fixedly installed at the lower end of housing b with bolts. A bearing seat made of metal is provided in the middle of housing a. Symmetrical steps are provided at both ends of the inner cavity of the bearing seat, and roller bearings are installed at the steps. The inner ring of the roller bearing is fixedly installed with a rotating shaft penetrating up and down. A wire reel is installed at the lower part of the rotating shaft. The wire reel is located in the inner cavity of housing a. A spiral spring is installed at the lower end of the rotating shaft. The outer end of the spiral spring is fixedly connected to the inner wall of housing b. A concentric worm is fixedly installed at the upper end of the rotating shaft. A rotatable turbine is installed on the upper side of housing a. The worm meshes with the turbine.

[0005] Preferably, both housing a and housing b are made of plastic, and the bearing seat is fixedly connected to housing a by insert injection molding.

[0006] Preferably, a through hole is provided on the side wall of housing a, and the cable connected to the wire reel is led out through the through hole.

[0007] Compared with the prior art, the beneficial effects of the utility model are: the bearing seat is a metal part and is fixedly connected to housing a by insert injection molding. The positioning precision of the bearing installed in the bearing seat is high, which can improve the transmission precision and the measurement precision of the cable pull sensor. After the cable is led out, the spiral spring drives the wire reel to rotate to realize automatic wire retraction, which is convenient to use. Description of the Drawings

[0008] Figure 1 It is a schematic cross-sectional structure diagram of the utility model.

[0009] In the figure: 1. Bottom plate; 2. Housing a; 3. Housing b; 4. Rotating shaft; 5. Wire reel; 6. Bearing seat; 7. Worm; 8. Turbine; 9. Coil spring. Specific embodiments

[0010] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0011] Please refer to Figure 1 , the present invention provides a technical solution: a transmission structure of a draw rope sensor, including coaxially docked housing a2 and housing b3. The lower end of housing b3 is fixedly installed with a bottom plate 1 by bolts. A bearing seat 6 made of metal is provided in the middle of housing a2. The metal bearing seat 6 can achieve a high machining accuracy. Both housing a2 and housing b3 are made of plastic. The bearing seat 6 is fixedly connected to housing a2 by insert injection molding. A through hole is provided on the side wall of housing a2, and the draw rope connected to the wire reel 5 is led out through the through hole.

[0012] Symmetric steps are respectively provided at both ends of the inner cavity of the bearing seat 6, and roller bearings are installed at the steps. The installation and positioning accuracy of the roller bearings in the bearing seat 6 is high, thereby improving the transmission accuracy. The inner ring of the roller bearing is fixedly installed with a rotating shaft 4 that penetrates up and down. A wire reel 5 is installed at the lower part of the rotating shaft 4. The wire reel 5 is located in the inner cavity of housing a2. A coil spring 9 is installed at the lower end of the rotating shaft 4. The outer end of the coil spring 9 is fixedly connected to the inner wall of housing b3. A concentric worm 7 is fixedly installed at the upper end of the rotating shaft 4. A rotatable turbine 8 is installed on the upper side of housing a2. The worm 7 meshes with the turbine 8. An encoder is used to detect the angular displacement signal at the output shaft end of the turbine 8. The transmission of the worm 7 to the turbine 8 is unidirectional, that is, only the worm 7 can drive the turbine 8 to rotate, and the turbine 8 cannot drive the worm 7. Therefore, the output rotation of the turbine 8 can be ensured to be stable, and the worm 7 has a certain reduction ratio to the turbine 8, which can reduce the rotational speed.

[0013] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transmission structure of a pull-wire sensor, comprising a housing a (2) and a housing b (3) that are concentrically connected, wherein a bottom plate (1) is fixedly mounted on the lower end of the housing b (3) by bolts, and characterized in that: A bearing seat (6) made of metal is provided in the middle of the shell a (2). Symmetrical steps are provided at both ends of the inner cavity of the bearing seat (6) and roller bearings are installed on the steps. A rotating shaft (4) penetrating from top to bottom is fixedly installed on the inner ring of the roller bearing. A wire drum (5) is installed at the lower part of the rotating shaft (4). The wire drum (5) is located in the inner cavity of the shell a (2). A worm spring (9) is installed at the lower end of the rotating shaft (4). The outer end of the worm spring (9) is fixedly connected to the inner wall of the shell b (3). A concentric worm (7) is fixedly installed on the upper end of the rotating shaft (4). A rotatable turbine (8) is installed on the upper side of the shell a (2). The worm (7) meshes with the turbine (8).

2. The transmission structure of the pull-wire sensor according to claim 1, characterized in that: The housing a (2) and the housing b (3) are both made of plastic material, and the bearing seat (6) is fixedly connected to the housing a (2) by insert injection molding.

3. The transmission structure of the pull-wire sensor according to claim 1, characterized in that: The side wall of the housing a (2) is provided with a through hole, and the pull rope connected to the wire drum (5) is pulled out through the through hole.

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