A tension sensor correction tool for a pantograph test bench

Abstract

This utility model discloses a tension sensor calibration fixture for a pantograph test bench, belonging to the field of pantograph testing technology. It includes a mounting platform with a support frame on one side of the upper part of the platform. A support guide assembly is mounted on the support frame, and a steel wire rope is wound around the support guide assembly. A counterweight assembly is connected to the upper part of the steel wire rope via a first connecting assembly, and the tension sensor to be tested is connected to the side of the steel wire rope away from the counterweight assembly via a second connecting assembly. This fixture effectively eliminates measurement errors caused by long-term use, force direction deviation, or zero-point drift of the tension sensor, achieving accurate sensor calibration and providing a reliable benchmark for pantograph holding force testing, thus avoiding test result deviations due to sensor errors.

Description

Technical Field

[0001] This utility model belongs to the field of pantograph testing technology, specifically a tension sensor calibration fixture for a pantograph test bench. Background Technology

[0002] As the current-collecting device between the locomotive and the overhead contact line in electrified railways, the pantograph's operating status directly affects train safety and power supply stability. During operation, the pantograph needs excellent raising and lowering performance, with the lowering holding force being a crucial parameter for evaluating its performance. Insufficient holding force can cause instability due to external vibrations or aerodynamic forces, leading to abnormal contact between the pantograph head and the contact line, thus affecting power supply safety. Conversely, excessive holding force can accelerate mechanical wear and shorten the pantograph's service life.

[0003] Chinese Utility Model Patent Publication No. CN207007383U discloses a device for measuring the pantograph's holding force upon landing. This device includes a laser rangefinder, a tension sensor, a mechanical transmission mechanism, and a data processing module. The laser rangefinder determines whether the pantograph head has moved and transmits the signal to the data processing module. The data processing module controls the mechanical transmission mechanism to stop working based on the feedback signal and simultaneously reads the real-time value from the tension sensor. The tension sensor measures the tension of the moving pantograph head. The mechanical transmission mechanism fixes the tension sensor, connects to the pantograph head, and provides power to load the pantograph head. The data processing module is responsible for collecting data from the laser rangefinder and the tension sensor, controlling the drive mechanism, and storing and analyzing the data. This device can quickly and accurately measure the pantograph's holding force upon landing and analyze changes in pantograph performance through periodic data comparison.

[0004] However, during long-term use, the tension sensor may experience zero-point drift or deviation in the direction of force, requiring correction and calibration to ensure that the sensor output matches the actual force. Utility Model Content

[0005] The purpose of this invention is to provide a tension sensor calibration fixture for a pantograph test bench, so as to solve at least one aspect of the problems and defects mentioned in the background art.

[0006] A tension sensor calibration fixture for a pantograph test bench is provided, including an installation platform. A support frame is provided on one side of the upper part of the installation platform. A support guide assembly is provided on the support frame. A steel wire rope is wound on the support guide assembly. A counterweight assembly is connected to the upper part of the steel wire rope through a first connecting assembly. The tension sensor to be tested is connected to the side of the steel wire rope away from the counterweight assembly through a second connecting assembly.

[0007] Furthermore, the support and guide assembly includes a main support and guide assembly, which is disposed on the support frame, and secondary support and guide assemblies are obliquely disposed on both sides of the main support and guide assembly.

[0008] Furthermore, the main support guide assembly includes a drive wheel axle, which is rotatably connected to the support frame. A drive wheel is fixedly connected to the drive wheel axle, and a guide groove is provided on the drive wheel.

[0009] Furthermore, the auxiliary support guide assembly includes an auxiliary drive wheel shaft, which is rotatably connected to the support frame. An auxiliary drive wheel is fixedly connected to the auxiliary drive wheel shaft, and a guide groove is provided on the auxiliary drive wheel.

[0010] Furthermore, the first connecting component includes a hook disposed on one side of the wire rope, the hook being connected to a lug, and the lug being disposed on the counterweight component.

[0011] Furthermore, the second connecting component includes a U-shaped connecting seat, which is fixedly connected to the force-bearing end of the tensile sensor to be tested. Adjusting screws are rotatably connected to both sides of the U-shaped connecting seat, and clamping blocks are provided on the top of the adjusting screws.

[0012] Furthermore, the counterweight assembly includes a main weight, on which several stepped mounting parts are arranged along the height direction, and auxiliary weights are detachably connected to the several stepped mounting parts. A hook is provided on the top of the main weight.

[0013] Furthermore, the main weight is provided with several mounting holes, and the secondary weight is provided with through holes. Locking bolts are provided in the several through holes and the mounting holes.

[0014] Furthermore, an anti-sway guide component is also provided on one side of the upper part of the mounting platform. The anti-sway guide component includes an anti-sway sleeve, which is detachably connected to the mounting platform via a mounting base. A counterweight component is fitted inside the anti-sway sleeve with a clearance.

[0015] Furthermore, the anti-sway sleeve is provided with an observation window.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model relates to a tension sensor calibration fixture for a pantograph test bench. By setting up a support frame on the mounting platform and installing a support guide assembly on the frame, the steel wire rope can maintain a stable force direction under guidance, avoiding the impact of skewing on the sensor's testing accuracy. One end of the steel wire rope is connected to a counterweight assembly via a first connecting assembly, and the other end is connected to the tension sensor under test via a second connecting assembly. The weight of the counterweight assembly generates a constant tension force, which acts directly on the sensor through the steel wire rope, thereby obtaining a standardized tension value. This method effectively eliminates measurement errors caused by long-term use, force direction deviation, or zero-point drift of the tension sensor, achieving precise sensor calibration and providing a reliable benchmark for pantograph holding force testing, avoiding test result deviations caused by sensor errors. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of the overall structure of a tension sensor calibration fixture for a pantograph test bench provided by this utility model; Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model; Figure 3 A schematic diagram of the counterweight component structure provided by this utility model; Figure 4 A schematic diagram of the auxiliary weight structure provided by this utility model; Figure 5 A schematic diagram of the structure of the second connecting component provided by this utility model.

[0019] In the diagram: 1. Mounting platform; 2. Support frame; 3. Support guide assembly; 31. Main support guide assembly; 311. Drive wheel axle; 312. Drive wheel; 32. Secondary support guide assembly; 321. Secondary drive wheel axle; 322. Secondary drive wheel; 4. Steel wire rope; 5. First connecting assembly; 51. Hook; 52. Hanging lug; 6. Counterweight assembly; 61. Main weight; 611. Mounting hole; 62. Stepped mounting part; 63. Secondary weight; 631. Through hole; 7. Secondary connecting assembly; 71. U-shaped connecting seat; 72. Adjusting screw; 73. Clamping block; 8. Tension sensor to be tested; 9. Observation window; 10. Anti-sway guide assembly; 101. Anti-sway sleeve; 102. Mounting base. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional 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.

[0022] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] Please see Figure 1-5As shown in the embodiment of this utility model, a tension sensor calibration fixture for a pantograph test bench includes an installation platform 1, a support frame 2 is provided on one side of the upper part of the installation platform 1, a support guide assembly 3 is provided on the support frame 2, a steel wire rope 4 is wound on the support guide assembly 3, a counterweight assembly 6 is connected to one side of the upper part of the steel wire rope 4 through a first connecting assembly 5, and a tension sensor 8 to be tested is connected to the side of the steel wire rope 4 away from the counterweight assembly 6 through a second connecting assembly 7. This utility model relates to a pantograph test bench with a tension sensor calibration fixture. A support frame 2 is installed on the mounting platform 1, and a support guide assembly 3 is mounted on the support frame 2. This ensures that the wire rope 4 maintains a stable force direction under guidance, avoiding the influence of skewness on the testing accuracy of the tension sensor 8. One end of the wire rope 4 is connected to a counterweight assembly 6 via a first connecting assembly 5, and the other end is connected to the tension sensor 8 via a second connecting assembly 7. The weight of the counterweight assembly 6 generates a constant tension force, which acts directly on the tension sensor 8 through the wire rope 4, thereby obtaining a standardized tension value. This method effectively eliminates measurement errors caused by long-term use, force direction deviation, or zero-point drift of the tension sensor 8, achieving precise sensor calibration and providing a reliable benchmark for pantograph holding force testing, avoiding test result deviations due to sensor errors.

[0027] In one embodiment, see Figure 1 , Figure 2 and Figure 3 As shown, the support guide assembly 3 includes a main support guide assembly 31, which is mounted on the support frame 2. Secondary support guide assemblies 32 are obliquely arranged on both sides of the main support guide assembly 31. By obliquely arranging the secondary support guide assemblies 32 on both sides of the main support guide assembly 31, and ensuring that the axes of the secondary support guide assemblies 32 and the main support guide assembly 31 are obliquely parallel and coplanar, the steel wire rope 4 sequentially passes around the main support guide assembly 31 and the two secondary support guide assemblies 32, thus forming a stable "triangular positioning" structure in space. This structure effectively restricts the swaying of the steel wire rope 4 in the horizontal and vertical directions, preventing the steel wire rope 4 from deviating or swinging during the force application process. It ensures that the tension is always transmitted to the tension sensor 8 under test along a fixed direction. Compared with using only a single guide assembly, the three-point support can provide multi-point stable constraints on the force path of the steel wire rope 4, improving the consistency of force application during the calibration process and the repeatability of force application to the tension sensor 8 under test, thereby improving the accuracy and reliability of the calibration of the tension sensor 8 under test.

[0028] In one embodiment, see Figure 1 , Figure 2 and Figure 3As shown, the main support guide assembly 31 includes a drive wheel shaft 311, which is rotatably connected to the support frame 2. A drive wheel 312 is fixedly connected to the drive wheel shaft 311, and a guide groove is provided on the drive wheel 312. The drive wheel shaft 311 is rotatably mounted on the support frame 2 by means of bearings, ensuring that it can rotate freely under the force of the wire rope 4. The drive wheel 312 is coaxially fixed to the outside of the drive wheel shaft 311. An annular guide groove is machined on the outer circumference of the drive wheel 312. The width of the guide groove is slightly larger than the diameter of the wire rope 4 to ensure that the wire rope 4 can be stably embedded and does not get stuck. When the wire rope 4 runs around the drive wheel 312, the guide groove limits and guides it, so that the wire rope 4 always stays within the specified trajectory. At the same time, the drive wheel 312 rotates under the tension of the wire rope 4, which significantly reduces the sliding friction between the wire rope 4 and the drive wheel 312. This ensures both the smooth operation of the wire rope 4 and the consistency of the force direction, while also enabling the tension sensor 8 under test to obtain a stable and reliable tension input, thereby improving the calibration accuracy.

[0029] In one embodiment, see Figure 2 , Figure 3 and Figure 4 As shown, the auxiliary support guide assembly 32 includes an auxiliary drive wheel shaft 321, which is rotatably connected to the support frame 2. An auxiliary drive wheel 322 is fixedly connected to the auxiliary drive wheel shaft 321, and a guide groove is provided on the auxiliary drive wheel 322. The auxiliary drive wheel shaft 321 is rotatably mounted on the support frame 2 by means of bearings or pins, ensuring that the auxiliary drive wheel shaft 321 can rotate flexibly under the force of the wire rope 4. The auxiliary drive wheel 322 is fixedly installed on the outside of the auxiliary drive wheel shaft 321, and an annular guide groove is machined on the outer circle of the auxiliary drive wheel 322. The width of the guide groove is slightly larger than the diameter of the wire rope 4, so that the wire rope 4 can be stably embedded in it.

[0030] In operation, the wire rope 4 passes sequentially around the main support guide assembly 31 and two auxiliary support guide assemblies 32. The auxiliary drive wheel 322 rotates under the traction of the wire rope 4, reducing the friction between the wire rope 4 and the guide surface. At the same time, under the limiting effect of the guide groove, the wire rope 4 is kept running in a fixed trajectory. With the assistance of the auxiliary support guide assembly 32, the wire rope 4 forms a stable triangular positioning path, avoiding force deviation, thereby ensuring the accuracy and consistency of the calibration data of the tension sensor 8 under test.

[0031] In one embodiment, see Figure 2 and Figure 3As shown, the first connecting component 5 includes a hook 51, which is disposed on one side of the wire rope 4. The hook 51 is connected to a hanging ear 52, which is disposed on the counterweight component 6. Preferably, there are two hooks 51 on the wire rope 4. The ends of the wire rope 4 are fixed to the two hooks 51 by snap-fit ​​or crimping. The two hooks 51 are respectively hooked to the two hanging ears 52 on the counterweight component 6 to form a double-point support. The counterweight component 6 can be a combined counterweight block. The hanging ears 52 are welded to the counterweight component 6 and are symmetrically arranged to ensure that the counterweight component 6 remains vertical during the force process. In use, the operator selects a counterweight component 6 of appropriate weight according to the required correction tension, and connects the hook 51 and the hanging ear 52. Under the guidance of the guide component, the steel wire rope 4 directly transmits the gravity generated by the counterweight component 6 to the tension sensor 8 to be tested. Due to the multi-point force-bearing design of double hooks 51 and double hanging ears 52, the counterweight component 6 is not easy to shake or deflect in the suspended state, thus ensuring the stability of the direction of the tension and the consistency of the force value.

[0032] In one embodiment, see Figure 2 and Figure 3 As shown, the second connecting component 7 includes a U-shaped connecting seat 71, which is fixedly connected to the force-bearing end of the tension sensor 8 under test. Adjusting screws 72 are rotatably connected to both sides of the U-shaped connecting seat 71, and clamping blocks 73 are provided at the top of the adjusting screws 72. This structure allows for adjustable clamping of the wire rope 4, preventing slippage or loosening of the wire rope 4 during force application. Simultaneously, the adjusting screws 72 can be rotated to adjust the clamping force, making the connection of the wire rope 4 more stable and reliable. The U-shaped structure ensures uniform force distribution, preventing deviation of the tension direction of the tension sensor 8 under test due to single-point force application, thereby guaranteeing the accuracy and stability of the tension sensor calibration.

[0033] In one embodiment, see Figure 2 , Figure 3 and Figure 4 As shown, the counterweight assembly 6 includes a main weight 61, a plurality of stepped mounting parts 62 are provided on the main weight 61 along the height direction, a secondary weight 63 is detachably connected to the plurality of stepped mounting parts 62, and a hook 51 is provided above the stepped mounting parts 62. The main weight 61 is made of integral cast iron or steel and is designed to be the basic standard weight. The outer surface of the main weight 61 is machined with multiple stepped mounting parts 62 along the height direction. The diameter of each stepped mounting part 62 decreases sequentially to form a stepped snap-fit ​​structure. The bottom of the secondary weight 63 is provided with through holes 631 that match the stepped mounting parts 62. The secondary weight 63 is detachably connected to the corresponding stepped mounting part 62 by screws. In this way, the operator can stack or remove the secondary weights 63 layer by layer on the main weight 61 as needed to achieve precise adjustment of the pulling force. The size of several secondary weights 63 matches the size of the stepped mounting parts 62, and their diameters also decrease sequentially.

[0034] In one specific embodiment, please refer to Figure 2 , Figure 3 and Figure 4 As shown, the main weight 61 has several mounting holes 611, and the secondary weight 63 has through holes 631. Locking bolts are installed within the through holes 631 and the mounting holes 611. In practice, the main weight 61 has radially machined mounting holes 611, and the through holes 631 of the secondary weight 63 correspond to the mounting holes 611. When the secondary weight 63 is fitted onto the stepped mounting part 62, the mounting holes 611 and through holes 631 automatically align. The operator can then insert the locking bolts and tighten them using nuts or internal threads. The locking bolts are preferably made of high-strength steel and can be rust-proofed to ensure reliability during long-term use.

[0035] During use, the operator can select to install one or more auxiliary weights 63 according to the required tension value for calibration, and fix them with locking bolts to form an overall counterweight. In this way, even when the tension is transmitted by the wire rope 4 and the counterweight assembly 6 is suspended, the auxiliary weights 63 will not shift due to gravity or shaking, ensuring the constant force and stable direction of the force applied during the calibration of the tension sensor 8 under test.

[0036] In one embodiment, see Figure 1 , Figure 2 and Figure 3As shown, an anti-sway guide assembly 10 is also provided on one side of the upper part of the mounting platform 1. The anti-sway guide assembly 10 includes an anti-sway sleeve 101, which is detachably connected to the mounting platform 1 via a mounting base 102. A counterweight assembly 6 is fitted inside the anti-sway sleeve 101 with a clearance. The anti-sway guide assembly 10 includes the anti-sway sleeve 101 and the mounting base 102. The mounting base 102 is fixed to the mounting platform 1 by bolts and is detachably connected to the anti-sway sleeve 101 for easy maintenance and replacement. The anti-sway sleeve 101 is made of steel or high-strength alloy material, and its inner diameter is slightly larger than the outer diameter of the counterweight assembly 6. A clearance of 2-5mm is maintained between the two, allowing the counterweight assembly 6 to move freely up and down in the vertical direction without significant lateral displacement. When the counterweight assembly 6 pulls the steel wire rope 4 to apply tension to the sensor under the action of gravity, the anti-sway sleeve 101 restrains it to avoid swaying caused by inertia or external interference, ensuring the testing stability and high accuracy of the tension sensor.

[0037] In one embodiment, see Figure 1 , Figure 2 and Figure 3 As shown, an observation window 9 is provided on the anti-sway sleeve 101. In this embodiment, the observation window 9 is opened along the vertical direction of the anti-sway sleeve 101, and its size ranges from 80 to 120 mm in length and 30 to 50 mm in width, ensuring that the operator can clearly see the lifting and lowering status of the counterweight component 6. The observation window 9 can be a long strip opening with chamfered or edged edges to prevent the operator from being scratched by sharp edges during inspection. If necessary, the observation window 9 can also be covered with a transparent impact-resistant material (such as tempered glass or polycarbonate sheet), which can prevent dust and foreign objects from entering the interior of the anti-sway sleeve 101 and provide a good field of vision. The observation window 9 is preferably located in the lower middle part of the anti-sway sleeve 101, so that the counterweight component 6 can be directly monitored throughout the entire operation, thereby improving the convenience of operation and the reliability of testing.

[0038] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A tension sensor correction tool for a pantograph test bench, comprising a mounting platform (1), characterized in that, The installation platform (1) has a support frame (2) on one side of its upper part. The support frame (2) has a support guide assembly (3) on it. A steel wire rope (4) is wound around the support guide assembly (3). A counterweight assembly (6) is connected to the upper side of the steel wire rope (4) through a first connecting assembly (5). A tensile sensor (8) to be tested is connected to the side of the steel wire rope (4) away from the counterweight assembly (6) through a second connecting assembly (7).

2. The tension sensor correction tool for a pantograph test bench according to claim 1, characterized in that, The support guide component (3) includes a main support guide component (31), which is mounted on the support frame (2), and secondary support guide components (32) are inclinedly mounted on both sides of the main support guide component (31).

3. The tension sensor correction tool for a pantograph test bench according to claim 2, characterized in that, The main support guide assembly (31) includes an active wheel shaft (311), which is rotatably connected to the support frame (2). An active wheel (312) is fixedly connected to the active wheel shaft (311), and a guide groove is provided on the active wheel (312).

4. The tension sensor correction tool for a pantograph test bench according to claim 3, characterized in that, The auxiliary support guide assembly (32) includes an auxiliary drive wheel shaft (321), which is rotatably connected to the support frame (2). An auxiliary drive wheel (322) is fixedly connected to the auxiliary drive wheel shaft (321), and a guide groove is provided on the auxiliary drive wheel (322).

5. The tension sensor correction tool for a pantograph test bench according to claim 4, characterized in that, The first connecting component (5) includes a hook (51) which is disposed on one side of the wire rope (4) and is connected to a hanging ear (52) which is disposed on the counterweight component (6).

6. The tension sensor correction tool for a pantograph test bench according to claim 1, characterized in that, The second connecting component (7) includes a U-shaped connecting seat (71), which is fixedly connected to the force-bearing end of the tensile sensor (8) to be tested. Adjusting screws (72) are rotatably connected to both sides of the U-shaped connecting seat (71), and a clamping block (73) is provided on the top of the adjusting screw (72).

7. The tension sensor correction tool for a pantograph test bench according to claim 1, characterized in that, The counterweight assembly (6) includes a main weight (61), and a number of stepped mounting parts (62) are provided on the main weight (61) along the height direction. A secondary weight (63) is detachably connected to the stepped mounting parts (62). A hook (51) is provided on the top of the main weight (61).

8. The tension sensor correction tool for a pantograph test bench according to claim 7, characterized in that, The main weight (61) is provided with a number of mounting holes (611), and the secondary weight (63) is provided with through holes (631). Locking bolts are provided in the through holes (631) and the mounting holes (611).

9. The tension sensor correction tool for a pantograph test bench according to claim 1, characterized in that, An anti-sway guide component (10) is also provided on one side of the upper part of the installation platform (1). The anti-sway guide component (10) includes an anti-sway sleeve (101). The anti-sway sleeve (101) is detachably connected to the installation platform (1) through the installation base (102). A counterweight component (6) is fitted inside the anti-sway sleeve (101) with a gap.

10. The tension sensor correction tool for a pantograph test bench according to claim 9, characterized in that, An observation window (9) is provided on the anti-sway sleeve (101).

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