Automatic calibration device for pull rope type sensor

Abstract

The utility model relates to the technical field of automatic control, in particular to an automatic calibration device for a pull rope type sensor. The utility model aims to provide a high-precision and wide-range automatic calibration device for a displacement sensor. The device comprises a mounting frame (1), a distance measuring rope and a winding device are arranged at one end of the mounting frame (1), and the device further comprises a repeated linear distance measuring device arranged in the winding direction of the winding device. The device has the characteristics of simple structure, simplicity and convenience in installation and operation, wide range and high precision.

Description

Technical Field

[0001] This utility model relates to the field of automatic control technology, and in particular to an automatic calibration device for a pull-string sensor. Background Technology

[0002] Draw-wire sensors are commonly used measuring instruments for measuring linear displacement. They mainly convert displacement into changes in voltage or current by changing capacitance, inductance, or resistance, thereby completing the displacement measurement.

[0003] Draw-wire sensors are widely used in the processing, assembly, and testing of large mechanical products, and their metrological characteristics have a significant impact on the accuracy of product manufacturing and assembly.

[0004] Currently, draw-wire sensors are primarily calibrated by metrology departments at various levels using length measuring equipment. For measuring ranges not exceeding 200mm, calibration can be performed on a universal tool microscope or length measuring machine; for ranges exceeding 200mm, calibration is only possible on a length measuring machine. However, the measurement range of large-range calibration devices is generally less than 2m, therefore draw-wire sensors with ranges exceeding 2m cannot be effectively calibrated, compromising their performance.

[0005] Therefore, designing a high-precision, large-range automatic calibration device for displacement sensors is an urgent technical problem to be solved. Utility Model Content

[0006] To address the aforementioned problems in the prior art, namely, the design of a high-precision, large-range automatic calibration device for displacement sensors, this invention provides a pull-string type automatic calibration device for sensors.

[0007] The technical solution of this utility model includes:

[0008] An automatic calibration device for a pull-rope sensor includes a mounting frame, one end of which is provided with a distance measuring rope and a winding device. The device is characterized in that it further includes a repetitive linear distance measuring device arranged along the winding direction of the winding device.

[0009] As an optional technical solution, the repetitive linear distance measuring device includes a guide rail fixed on the mounting frame, and a fixed clamping device and a movable clamping device installed at both ends of the guide rail.

[0010] As an optional technical solution, the fixing clamping device includes a fixing clamp, which is fixedly disposed at one end of the guide rail, and the upper end of the fixing clamp is provided with a groove, in which a first clamping block is disposed. The outer side of the upper end of the fixing clamp is provided with a first telescopic cylinder, the telescopic end of the first telescopic cylinder is fixedly connected to the first clamping block, and drives the first clamping block to clamp the ranging rope.

[0011] As an optional technical solution, the mobile clamping device includes a sliding clamp, which is slidably mounted on the other end of the guide rail. The upper end of the sliding clamp is provided with a groove, and a second clamping block is provided in the groove. A second telescopic cylinder is provided on the outer side of the upper end of the sliding clamp. The telescopic end of the second telescopic cylinder is fixedly connected to the second clamping block and drives the second clamping block to clamp the distance measuring rope.

[0012] As an optional technical solution, the repetitive linear ranging device also includes a threaded rod and a drive motor. The threaded rod is fixedly installed below the guide rail and connected to the output end of the drive motor. The lower part of the sliding clamp is threadedly connected to the threaded rod and moves linearly back and forth along the guide rail under its drive.

[0013] As an optional technical solution, the guide rail is provided with rope guide plates at both ends, and the rope guide plates are provided with a first wire passage hole and a second wire passage hole respectively.

[0014] As an optional technical solution, the first and second wire passages are embedded with wear-resistant guide tubes with low friction coefficients.

[0015] As an optional technical solution, the guide tube is a ceramic conduit.

[0016] As an optional technical solution, the winding device includes a take-up roller and a take-up motor mounted on a mounting frame and connected to the shaft of the take-up roller.

[0017] As an optional technical solution, a torque sensor is provided on the output shaft of the winding motor to determine whether the distance measuring rope is in a taut state.

[0018] The beneficial effects of this utility model are:

[0019] (1) The automatic calibration device for the pull-rope sensor of this utility model winds the pull rope through a winding device on the mounting frame, then a sliding clamping device clamps the pull rope. The sliding clamping device then moves towards a fixed clamping device under the drive of a threaded rod, and the fixed clamping device clamps the pull rope. The sliding clamping device then releases and moves outward. When the sliding clamping device reaches the outer end, it clamps the pull rope again, and the fixed clamping device releases. The winding device then tightens the pull rope. This cycle repeats, and the length of the pull rope can be determined by calculating the winding length of the initial winding structure plus the total moving distance of the sliding clamping device, thus calibrating the pull-rope displacement sensor. This device determines the pull rope length through the reciprocating movement of the sliding device, offering high measurement accuracy and ease of operation.

[0020] (2) The automatic calibration device for the pull-rope sensor of this utility model can also more accurately control the state of tightening the distance measuring rope each time by setting a torque sensor on the winding roller, thereby improving the overall distance measuring accuracy of this utility model.

[0021] (3) The automatic calibration device for pull-rope type sensor of this utility model can also improve the service life of the automatic calibration device for pull-rope type sensor of this utility model by setting a wear-resistant and low friction coefficient guide tube, and further reduce the accuracy error caused by wear during use. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the automatic calibration device for a pull-string sensor according to this utility model.

[0024] Figure label:

[0025] 1-Mounting frame, 2-Take-up roller, 3-Take-up motor, 4-Guide rail, 5-Drive motor, 6-Threaded rod, 7-Fixed clamp, 10-Sliding clamp, 11-First wire guide hole, 12-Second wire guide hole, 82-First telescopic cylinder, 81-Second telescopic cylinder, 92-First clamping block, 91-Second clamping block. Detailed Implementation

[0026] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of the automatic calibration device for a pull-string sensor according to this utility model.

[0029] like Figure 1 As shown, this utility model provides an automatic calibration device for a pull-string sensor, including a mounting frame 1. A winding device is provided on the mounting frame 1, and a repetitive linear distance measuring device is provided in front of the winding direction of the winding device. The repetitive linear distance measuring device includes a fixed clamping device and a sliding clamping device.

[0030] The winding device includes a take-up roller 2 and a take-up motor 3. The take-up roller 2 is fixedly mounted on the mounting frame 1. The take-up roller 2 can rotate around the axis to wind and unwind the distance measuring rope. The take-up motor 3 is fixedly mounted on the mounting frame 1. The output end of the take-up motor 3 is pivotally connected to the take-up roller 2. During winding, the take-up motor 3 drives the take-up roller 2 to rotate and wind up the distance measuring rope.

[0031] As one embodiment, a torque sensor can also be installed on the output shaft of the winding motor 3 to determine whether the distance measuring rope is tightened.

[0032] The fixed clamping device includes a fixed clamp 7, a first telescopic cylinder 82, and a first clamping block 92. The fixed clamp 7 is fixedly installed on the rear of the guide rail 4, the first telescopic cylinder 82 is fixedly installed on the fixed clamp 7, and the first clamping block 92 is fixedly installed on the telescopic end of the first telescopic cylinder 82.

[0033] The sliding clamping device includes a sliding clamp 10, a second telescopic cylinder 81, and a second clamping block 91. The sliding clamp 10 is slidably mounted on the guide rail 4. The second telescopic cylinder 81 is fixedly mounted on the sliding clamp 10, and the second clamping block 91 is fixedly mounted on the telescopic end of the second telescopic cylinder 81. The sliding clamp 10 and the threaded rod 6 are engaged. The threaded rod 6 is fixedly mounted below the guide rail 4 and connected to the output end of the drive motor 5. The drive motor 5 is fixedly mounted on the mounting bracket 1.

[0034] The fixed clamping device and the sliding clamping device respectively clamp the measuring rope by moving the clamping block through the telescopic cylinder, and the threaded rod 6 drives the sliding clamp 10 to slide on the guide rail 4.

[0035] The guide rail 4 has a first wire hole 11 at its front end and rear end, through which the measuring rope passes. A wear-resistant, low-friction coefficient tube, such as a ceramic conduit, is installed inside the first wire hole 11.

[0036] Working principle of this utility model:

[0037] During operation, the ranging rope of the pull rope displacement sensor is wound by the winding device on the mounting frame 1, and then the sliding clamping device clamps the ranging rope, measuring the length of the wound ranging rope and the distance of the unwound portion from the sliding clamp. Then, the sliding clamping device moves towards the fixed clamping device driven by the threaded rod 6, and the fixed clamping device clamps the ranging rope. Then, the sliding clamping device moves in the opposite direction, clamping the ranging rope when it reaches the outer end, and then the fixed clamping device releases the ranging rope. The winding device then tightens the rope. The fixed clamping device repeats the above process again. Finally, by calculating the length of the first winding device plus the distance of the unwound portion from the sliding clamp, and the total stroke of the sliding clamping device, the length of the rope can be determined, thus calibrating the pull rope displacement sensor.

[0038] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0041] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A kind of automatic calibration device of pull rope type sensor, including mounting bracket (1), the mounting bracket (1) one end is provided with ranging rope and winding device, it is characterized in that, The winding device further comprises a repeated linear distance measuring device arranged along the winding direction of the winding device. The repeated linear distance measuring device comprises a guide rail (4) fixed on the mounting frame (1), and a fixed clamping device and a moving clamping device arranged at both ends of the guide rail (4).

2. The pull wire sensor automatic calibration device of claim 1, wherein: The fixed clamping device comprises a fixed clamp (7) fixedly arranged at one end of the guide rail (4), and a groove is arranged at the upper end of the fixed clamp (7), and a first clamping block (92) is arranged in the groove, and a first telescopic cylinder (82) is arranged outside the upper end of the fixed clamp (7), and the telescopic end of the first telescopic cylinder (82) is fixedly connected with the first clamping block (92), and the first telescopic cylinder (82) drives the first clamping block (92) to clamp the distance measuring rope.

3. The pull wire sensor automatic calibration device of claim 2, wherein: The moving clamping device comprises a sliding clamp (10) slidingly sleeved at the other end of the guide rail (4), and a groove is arranged at the upper end of the sliding clamp (10), and a second clamping block (91) is arranged in the groove, and a second telescopic cylinder (81) is arranged outside the upper end of the sliding clamp (10), and the telescopic end of the second telescopic cylinder (81) is fixedly connected with the second clamping block (91), and the second telescopic cylinder (81) drives the second clamping block (91) to clamp the distance measuring rope.

4. The pull wire sensor automatic calibration device of claim 3, wherein: The repeated linear distance measuring device further comprises a threaded rod (6) and a driving motor (5), the threaded rod (6) is fixedly arranged below the guide rail (4) and connected with the output end of the driving motor (5), and the lower part of the sliding clamp (10) is threadedly connected with the threaded rod (6) and moves linearly along the guide rail (4) under the driving of the threaded rod (6).

5. The pull wire sensor automatic calibration device of claim 1, wherein: The guide rail (4) is provided with a rope guide plate at both ends, and the rope guide plate is respectively provided with a first wire passing hole (11) and a second wire passing hole (12).

6. The pull wire sensor automatic calibration device of claim 5, wherein: The first wire passing hole (11) and the second wire passing hole (12) are embedded with a rope guide tube with wear resistance and small friction coefficient.

7. The pull wire sensor automatic calibration device of claim 6, wherein: The rope guide tube is a ceramic guide tube.

8. The pull wire sensor automatic calibration device of claim 1, wherein: The winding device comprises a winding roller (2), and a winding motor (3) arranged on the mounting frame (1) and connected with the winding roller (2).

9. The pull wire sensor automatic calibration device of claim 8, wherein: A torque sensor is arranged on the output shaft of the winding motor (3), and the torque sensor is used to determine whether the distance measuring rope is in a tensioned state.

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