A turnout gap displacement sensor precision detection device

Abstract

This utility model discloses a precision detection device for a switch machine notch displacement sensor, comprising a housing, a slider disposed within the housing and movable within the housing, and an electronic ruler with its output end connected to the slider. A support bracket for the device under test, supporting the displacement sensor, is provided on the housing. The electric actuator and electronic ruler scheme can reliably operate in ambient temperatures ranging from -40°C to 70°C, meeting environmental requirements, adapting to extreme temperatures, ensuring reliable operation, moderate cost, and ease of maintenance.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to a precision detection device for a switch machine notch displacement sensor. Background Technology

[0002] In railway transportation, turnouts, as important components of the track, operate in an open-air environment for extended periods. Their operating temperature ranges from -40℃ to 70℃. Under these conditions, turnout parameters (such as the changes in turnout contact and switch rail creep) will vary with temperature. When these parameters exceed a certain range, they will affect train safety and pose serious safety hazards to the normal operation of the railway.

[0003] Therefore, it is necessary to install a dedicated displacement sensor at a suitable location on the turnout to detect these changes. However, the displacement sensor itself is also an electromechanical integrated product, and its displacement accuracy will also be affected by the ambient temperature. Therefore, it is necessary to conduct displacement accuracy tests under extreme ambient temperatures before leaving the factory to ensure that its parameters are qualified.

[0004] To test the displacement accuracy of displacement sensors, an invention patent with application number 202411315695.2, entitled "A Displacement Accuracy Detection Device for Non-standard Displacement Sensors," is provided. The device includes a fixed platform on which are mounted: a sensor fixing assembly for fixing the non-standard displacement sensor; a linear power assembly whose output end is fixed to a proximity source for driving the proximity source's displacement; a first displacement display terminal connected to the non-standard displacement sensor for receiving and displaying the displacement data detected by the sensor; a second displacement display terminal connected to the linear power assembly for receiving and displaying the actual travel data of the linear power assembly; and a real-time data acquisition assembly electrically connected to the first and second displacement display terminals for acquiring and calculating the difference between the displacement data and the actual travel data during the same period, thereby determining whether the non-standard displacement sensor is qualified.

[0005] Application number 202223156324.3 discloses a laser displacement sensor repeatability detection device, comprising a first support frame and a second support frame. The first and second support frames are respectively provided with receiving grooves for accommodating standard parts. The first and second support frames are connected by a first substrate and a second substrate, respectively. Sliding mechanisms are respectively provided on the first and second substrates, and a detection seat is provided between the corresponding sliding mechanisms. An installation channel is opened in the detection seat, and a control box is provided on one side of the detection seat. The control box is electrically connected to both the sliding mechanism and the laser displacement sensor. This invention uses a standard part placed under the first and second support frames, and a laser displacement sensor to be tested is placed in the detection seat directly above the standard part. The detection seat drives the laser displacement sensor to measure different points on the same side of the standard part. Multiple sets of measurement data are compared and analyzed to determine whether the repeatability of the laser displacement sensor is good.

[0006] However, the above solution can only operate at temperatures ≥0℃. When the temperature is <0℃, it is prone to step loss or even difficulty in starting, leading to drive failure. Furthermore, as a highly integrated precision device, once the accuracy deteriorates or jams, special tools and equipment are required for repair and calibration, resulting in high maintenance costs. Utility Model Content

[0007] The purpose of this invention is to solve the above problems and provide a switch machine notch displacement sensor accuracy detection device that is adaptable to extreme ambient temperatures, reliable in operation, moderately priced, and easy to maintain.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] A switch machine notch displacement sensor accuracy detection device includes a housing, a slider disposed inside the housing and moving inside the housing, an electronic ruler with its output end connected to the slider, and a test device bracket provided on the housing for supporting the displacement sensor to be tested.

[0010] Furthermore, the housing is provided with a guide rail for guiding the movement of the slider.

[0011] Furthermore, the housing is provided with an electric push rod that drives the slider to move.

[0012] Furthermore, the slider is provided with a fixing plate, and the pull rod of the electronic ruler is connected to the fixing plate.

[0013] Furthermore, the pull rod of the electronic ruler is equipped with a universal joint.

[0014] Furthermore, a test plate is provided on the side of the slider.

[0015] Furthermore, the device under test bracket is provided with a clamping mechanism for fixing the displacement sensor to be tested.

[0016] Furthermore, the clamping mechanism includes fixed frames symmetrically arranged on the support of the device under test, wherein a movable plate is provided on one side of the fixed frame.

[0017] Furthermore, the movable plate is provided with a guide rod passing through the corresponding fixed frame on its outer side. One end of the guide rod is connected by a connecting rod, and a tension spring is provided on the guide rod. One end of the tension spring is connected to the corresponding fixed frame, and the other end of the tension spring is connected to the connecting rod.

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

[0019] 1. This utility model includes a housing, a slider disposed within the housing and movable within the housing, and an electronic ruler with its output end connected to the slider. The housing is provided with a support bracket for supporting the displacement sensor under test. The electric actuator plus electronic ruler scheme can reliably operate in ambient temperatures ranging from -40°C to 70°C, meeting environmental requirements, adapting to extreme temperatures, ensuring reliable operation, moderate cost, and ease of maintenance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is the front view of the present utility model;

[0023] Figure 3 This is a schematic diagram of the clamping mechanism of this utility model;

[0024] Figure 4 This is a bottom view of the clamping mechanism of this utility model.

[0025] In the diagram: 1. Housing; 2. Slider; 3. Electronic ruler; 4. Test device bracket; 5. Guide rail; 6. Electric push rod; 7. Fixing plate; 8. Universal joint; 9. Test plate; 10. Fixing frame; 11. Movable plate; 12. Guide rod; 13. Connecting rod; 14. Tension spring. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0027] like Figure 1 As shown, a switch machine notch displacement sensor accuracy detection device includes a housing 1, a slider 2 disposed in the housing 1 and movable within the housing 1, an electronic ruler 3 whose output end is connected to the slider 2, and a test device bracket 4 provided on the housing 1 for supporting the displacement sensor to be tested.

[0028] In this experimental setup, the position controller and speed controller in the drive control section are designed as an integrated control box placed at room temperature; while the electronic ruler, electric push rod, and test equipment support are designed as an integrated workbench placed inside the high and low temperature test chamber, serving as a carrier for the displacement sensor under test, and are connected by cables.

[0029] In this application, an electric linear actuator with a built-in encoder is selected as the power component. Its working principle is that the electric motor, after being reduced in speed by gears or a worm gear, drives a pair of lead screws and nuts, converting the motor's rotational motion into linear motion, thus driving the worktable to move linearly. To reduce costs and increase torque, a high-thrust electric linear actuator driven by a brushed motor is selected. Brushed motors are characterized by high starting torque and good low-speed performance; high thrust indicates a higher gear ratio, which can effectively overcome the resistance of the transmission mechanism under low-temperature conditions. The motor, encoder, transmission, and limit circuit are all integrated into a sealed housing, improving safety and reliability.

[0030] The conductive plastic linear potentiometer for electronic rulers operates stably at both low and high temperatures. It is a precision pull-rod sensor made of conductive plastic as the resistive material, achieving a resistance range of 100Ω-5MΩ through thick-film printing technology. Its output linearity accuracy is 3‰-1‰, repeatability accuracy is 0.01mm, and mechanical life reaches tens of millions of cycles. This device features a hard aluminum alloy shell and precious metal brushes, offering smooth operation, low dynamic noise, and a wide operating temperature range. It is widely used in industrial automation control fields such as automotive electronics and aerospace.

[0031] The electric linear actuator plus electronic scale solution can work reliably in ambient temperatures ranging from -40 to 70℃, meeting the requirements of the operating environment, adapting to extreme ambient temperatures, operating reliably, with moderate cost and easy maintenance.

[0032] like Figure 1 As shown, the housing 1 is provided with a guide rail 5 to guide the movement of the slider 2.

[0033] like Figure 1 As shown, the housing 1 is provided with an electric push rod 6 that drives the slider 2 to move. The axis of the output shaft of the electric push rod 6 extends through the slider 2 without offset, which reduces the reliability requirements and prevents inaccurate movement distance due to assembly gaps after long-term use, thus improving service life.

[0034] like Figure 2 As shown, the slider 2 is equipped with a fixing plate 7, and the pull rod of the electronic ruler 3 is connected to the fixing plate 7. The pull rod of the electronic ruler 3 is connected to the movable plate, and the outer shell of the electronic ruler 3 is fixed to the housing 1 by a fixing clip. When the slider 2 moves, the pull rod of the electronic ruler 3 continuously extends and retracts under the action of the fixing plate 7.

[0035] like Figure 2 As shown, the pull rod of the electronic ruler 3 is equipped with a universal joint 8. The universal joint is used to compensate for non-concentric assembly errors. When the worktable moves, the pull rod extends and retracts with the worktable, and the change in its resistance value is proportional to the displacement of the worktable. The position controller determines whether the worktable has been displaced into position based on the feedback of its position.

[0036] like Figure 2 As shown, the slider 2 has a test plate 9 on its side.

[0037] like Figure 1 As shown, the test device bracket 4 is provided with a clamping mechanism for fixing the displacement sensor to be tested, and the test device bracket 4 is provided with an opening for the test plate to pass through.

[0038] like Figure 3 As shown, the clamping mechanism includes a fixed frame 10 symmetrically arranged on the device under test bracket 4, wherein a movable plate 11 is provided on one side of the fixed frame 10, and the movable plate 11 cooperates with the fixed frame 10 to clamp the displacement sensor to be tested.

[0039] like Figure 3 As shown, the movable plate 11 has a guide rod 12 passing through the corresponding fixed frame 10 on its outer side. One end of the guide rod 12 is connected by a connecting rod 13. A tension spring 14 is provided on the guide rod 12. One end of the tension spring 14 is connected to the corresponding fixed frame 10, and the other end of the tension spring 14 is connected to the connecting rod 13. Under the action of the tension spring 14, the movable plate 11 moves towards the fixed frame 10 on the other side, thereby clamping the displacement sensor to be measured. When replacing the displacement sensor to be measured, it is only necessary to pull the connecting rod 13 outward, which is convenient for replacement.

[0040] In the description of this utility model, it should be noted that the terms "left", "right", "up", "down", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to 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.

[0041] In the description of this utility model, it should be noted that, 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 based on the specific circumstances.

Claims

1. A turnout gap displacement sensor accuracy detection device, characterized by, Includes a housing (1), a slider (2) disposed inside the housing (1) and moving inside the housing (1), and an electronic ruler (3) whose output end is connected to the slider (2). The housing (1) is provided with a test device bracket (4) for supporting the displacement sensor to be measured.

2. The accuracy detection device for a switch machine notch displacement sensor as described in claim 1, characterized in that, The housing (1) is provided with a guide rail (5) to guide the movement of the slider (2).

3. The accuracy detection device for a switch machine notch displacement sensor as described in claim 1, characterized in that, The housing (1) is provided with an electric push rod (6) that drives the slider (2) to move.

4. The accuracy detection device for a switch machine notch displacement sensor as described in claim 1, characterized in that, The slider (2) is provided with a fixing plate (7), and the pull rod of the electronic ruler (3) is connected to the fixing plate (7).

5. The accuracy detection device for a switch machine notch displacement sensor as described in claim 4, characterized in that, The pull rod of the electronic ruler (3) is equipped with a universal joint (8).

6. The accuracy detection device for a switch machine notch displacement sensor as described in claim 1, characterized in that, The slider (2) has a test plate (9) on its side.

7. The accuracy detection device for a switch machine notch displacement sensor as described in claim 1, characterized in that, The device under test bracket (4) is provided with a clamping mechanism for fixing the displacement sensor to be tested.

8. The accuracy detection device for a switch machine notch displacement sensor as described in claim 7, characterized in that, The clamping mechanism includes a fixed frame (10) symmetrically arranged on the test equipment bracket (4), wherein a movable plate (11) is provided on one side of the fixed frame (10).

9. The accuracy detection device for a switch machine notch displacement sensor as described in claim 8, characterized in that, The movable plate (11) is provided with a guide rod (12) that passes through the corresponding fixed frame (10) on the outside. One end of the guide rod (12) is connected by a connecting rod (13). A tension spring (14) is provided on the guide rod (12). One end of the tension spring (14) is connected to the corresponding fixed frame (10), and one end of the tension spring (14) is connected to the connecting rod (13).

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