A length testing tool

Abstract

The present invention discloses a length testing tool, which relates to the technical field of length measurement, including a test platform, a translation mechanism, a fixed detection plate, a mobile detection plate, a fixture, a distance measuring sensor and a control host box. The test platform is provided with a translation mechanism, one end of the translation mechanism is connected to the fixed detection plate, a mobile detection plate is slidably provided on the translation mechanism, the fixed detection plate and the mobile detection plate can be fitted together, the fixture is detachably connected to the test platform, the fixture is located between the fixed detection plate and the mobile detection plate when measuring the size of a workpiece to be measured, the distance measuring sensor is connected to the mobile detection plate and the test platform, and the translation mechanism, the distance measuring sensor and the control host box are all capable of communication connection. In the present invention, a fixture is used to fix the workpiece to be measured. Since the translation mechanism drives the mobile detection plate to move therewith, it meets the measurement requirements of workpieces of different lengths, reduces the dependence on special tooling, avoids manual measurement operations, and improves the accuracy of the measurement results.

Description

Technical Field

[0001] The present invention relates to the technical field of length measurement, in particular to a length testing tool. Background Art

[0002] As a key component of the automobile suspension system, the performance and quality of automobile shock absorbers directly affect the driving comfort and safety of the car. Bushings, oil reservoirs, connecting rod assemblies, etc. are important components of the shock absorber. Their length and dimensional accuracy plays a decisive role in the overall performance of the shock absorber.

[0003] Currently, the lengths of oil reservoirs and connecting rod assemblies in automotive shock absorbers are measured using calipers. However, the surface profile of rubber bushings is a hobbing groove shape, making them impractical to measure with calipers. Therefore, a custom go / no-go gauge inspection tool was developed. The product is first tested on the go side, then on the no-go side. If it passes, it passes; otherwise, it fails. Existing techniques for measuring objects of varying shapes and sizes typically require the use of multiple specially designed tooling. This approach not only increases costs but also reduces efficiency, as each change in measurement object requires adjustment or replacement of the corresponding tooling.

[0004] Because a single tool cannot adapt to diverse measurement needs and its measurement accuracy is often low, especially when processing objects with complex geometries, the error is more significant. As the automotive industry continues to demand higher quality and production efficiency, traditional measurement methods are no longer able to meet the needs, and a high-precision measurement tool is urgently needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a length testing tool to solve the problems existing in the above-mentioned prior art, so that the testing tool can be applicable to the length measurement requirements of various workpieces and the measurement accuracy is significantly improved.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a length testing tool, comprising a testing platform, a translation mechanism, a fixed detection plate, a movable detection plate, a fixture, a distance measuring sensor and a control host box. The translation mechanism is provided on the testing platform, one end of the translation mechanism is connected to the fixed detection plate, the movable detection plate is slidably provided on the translation mechanism, the fixed detection plate and the movable detection plate are arranged relative to each other and can be fitted together, the fixture is detachably connected to the testing platform, and when measuring the size of a workpiece to be measured, the fixture is located between the fixed detection plate and the movable detection plate, the distance measuring sensor is connected to the movable detection plate and the testing platform, the distance measuring sensor is used to detect the distance between the movable detection plate and the fixed detection plate, and the translation mechanism, the distance measuring sensor and the control host box are all communicatively connected.

[0008] Preferably, the upper surface of the fixture is provided with a material discharge trough, which is used to place the workpiece to be measured; the material discharge trough is V-shaped, arc-shaped or rectangular; the fixture is provided with several models of different sizes, and each model of the fixture is used to match a workpiece to be measured; the fixture is provided with at least one, and the axis of the workpiece to be measured is parallel to the center line of the translation mechanism.

[0009] Preferably, a workpiece sensing sensor is provided on the discharge trough, and the workpiece sensing sensor is used to detect whether the workpiece to be tested is placed in the discharge trough; the workpiece sensing sensor includes a proximity switch or a photoelectric switch, and the workpiece sensing sensor can be communicatively connected to the control host box.

[0010] Preferably, the bottom surface of the fixture is higher than the translation mechanism, the test platform is provided with a plurality of connection holes along the moving direction of the translation mechanism, and the bottom of the fixture is detachably connected to the connection holes through a pair of positioning pins.

[0011] Preferably, the ranging sensor is a grating sensor, and the indicator grating of the grating sensor is connected to the movable detection plate, and the scale grating is fixedly connected to the bottom surface of the test platform; the top of the fixed detection plate is detachably connected to a cylindrical positioning block by bolts, and the radius of the cylindrical positioning block can match the through hole radius of the workpiece to be measured.

[0012] Preferably, the translation mechanism includes a ball screw module and a servo motor, the screw of the ball screw module is connected to the servo motor, and the slide is connected to the movable detection plate; a limit switch is provided at one end of the ball screw module close to the servo motor, and the fixed detection plate is provided at the end away from the servo motor, the limit switch is used to limit the maximum displacement of the movable detection plate, and the limit switch is communicatively connected to the control host box.

[0013] Preferably, a linear track is provided below the ball screw module, a track groove is provided below the slide, the movement detection plate is connected to the upper baffle by bolts, a spring is provided between the baffle and the nut of the bolt, the diameter of the through hole on the baffle is larger than the diameter of the bolt, and the track groove is slidably matched on the linear track; a plurality of mounting holes are provided on one side of the linear track along the length direction, and the limit switch is connected to the mounting hole by bolts.

[0014] Preferably, a slider is further provided on the screw of the ball screw module, and the slide is slidably sleeved on the screw. The slider is closer to the servo motor than the slide, and a spring in a compressed state is connected between the slider and the slide through a slot.

[0015] Preferably, a pressure sensor is connected to the slider, the pressure sensor can conflict with the slide seat, and the pressure sensor is communicatively connected to the control host box; the distance between the slider and the slide seat is 3mm-6mm.

[0016] Preferably, the test platform and the control host box are both arranged on a mobile cart, and the control host box is provided with a touch operation display screen, an alarm prompt for unqualified products and an alarm release button; the four corners of the test platform are respectively connected to the ground through height adjustment bolts, and the mobile cart is preferably provided with an anti-static substrate.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The present invention uses a fixture to fix the workpiece to be measured, and utilizes a translation mechanism to move the distance measuring sensor to measure the axial length of the workpiece to be measured between the fixed detection plate and the movable detection plate. Since the translation mechanism drives the movable detection plate to move accordingly, it meets the measurement requirements of workpieces of different lengths, reduces dependence on special tooling, avoids manual measurement operations, and significantly improves the accuracy of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the structure of the length testing tool in the embodiment of the present invention Figure 1 ;

[0021] Figure 2Schematic diagram of the length test tool in the embodiment of the present invention Figure 2 ;

[0022] Figure 3 Schematic diagram of the structure of the length testing tool in the embodiment of the present invention Figure 3 ;

[0023] Figure 4 Schematic diagram of the structure of the length testing tool in the embodiment of the present invention Figure 4 ;

[0024] Figure 5 Schematic diagram of the structure of the length testing tool in the embodiment of the present invention Figure 5 ;

[0025] In the figure: 1-test platform, 2-control host box, 3-fixed detection plate, 4-cylindrical positioning block, 5-translational mechanism, 6-mobile detection plate, 7-clamp, 8-discharging trough, 9-workpiece sensing sensor, 10-connecting hole, 11-locating pin, 12-distance measuring sensor, 13-ball screw module, 14-servo motor, 15-slide, 16-track groove, 17-linear track, 18-limit switch, 19-baffle, 20-bolt, 21-spring, 22-mounting hole, 23-slider, 24-pressure sensor, 25-connecting plate, 26-waist hole, 27-heightening bolt, 28-base, 29-moving trolley, 30-workpiece to be tested. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "inside", "outside", "front", "back", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] The purpose of the present invention is to provide a length testing tool to solve the problems existing in the prior art, so that the testing tool can be applicable to the length measurement requirements of various workpieces and the measurement accuracy is significantly improved.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] like Figures 1 to 5As shown, in this embodiment, a length testing fixture is provided, including a test platform 1, a translation mechanism 5, a fixed detection plate 3, a mobile detection plate 6, a fixture 7, a distance sensor 12 and a control host box 2. The test platform 1 is provided with a translation mechanism 5, one end of the translation mechanism 5 is connected to the fixed detection plate 3, and the mobile detection plate 6 is slidably provided on the translation mechanism 5. The fixed detection plate 3 and the mobile detection plate 6 are arranged relative to each other and can fit together. The fixture 7 is detachably connected to the test platform 1, and when measuring the size of the workpiece 30 to be measured, the fixture 7 is located between the fixed detection plate 3 and the mobile detection plate 6. The distance sensor 12 is connected to the mobile detection plate 6 and the test platform 1, and the distance sensor 12 is used to detect the distance between the mobile detection plate 6 and the fixed detection plate 3. The translation mechanism 5, the distance sensor 12 and the control host box 2 are all able to communicate. Among them, the fixed detection plate 3 is preferably arranged perpendicular to the translation mechanism 5.

[0033] As an optional solution, in this embodiment, the upper surface of the fixture 7 is provided with a material discharge trough 8, which is used to place the workpiece 30 to be measured and plays a positioning and support role. The material discharge trough 8 is V-shaped, arc-shaped, or rectangular. The fixture 7 is provided with several models of different sizes, each model of the fixture 7 is used to match a workpiece 30 to be measured, and can be replaced according to the size of the workpiece to match different workpieces. There is at least one fixture 7, and the axis of the workpiece 30 to be measured is parallel to the center line of the translation mechanism 5. When the length of the workpiece 30 to be measured is too long, two or more fixtures 7 can be used to support the workpiece. In this embodiment, the main purpose is to measure cylindrical workpieces, so the upper surface of the fixture 7 is provided with a material discharge trough 8. If other workpieces are to be measured, matching conversion can also be performed according to the shape of the workpiece 30 to be measured.

[0034] As an optional solution, in this embodiment, a workpiece sensing sensor 9 is provided on the discharge trough 8 or the fixture 7. This sensor 9 is used to detect whether the workpiece 30 to be measured is placed in the discharge trough 8. The sensor 9 comprises a proximity switch, a photoelectric switch, or a laser sensor, and is communicatively connected to the control main box 2. The sensor 9 has a trigger accuracy of ±0.002mm, which verifies the presence of the workpiece 30 to be measured. This ensures that the repeatability error range of multi-sensor fusion measurement is within 0.005mm and the detection cycle is within 15 seconds per piece.

[0035] As an optional solution, in this embodiment, the bottom surface of the fixture 7 is higher than the translation mechanism 5, and the test platform 1 is provided with several pairs of connecting holes 10 along the moving direction of the translation mechanism 5. The bottom of the fixture 7 is detachably connected to the connecting hole 10 through a pair of positioning pins 11. The connecting hole 10 is a blind hole, and the positioning pin 11 can be inserted into the blind hole to assist in positioning the fixture 7, so as to facilitate the rapid installation and removal of the fixture 7, or the lower end of the positioning pin 11 is provided with a thread, and the connecting hole 10 is a threaded hole. The positioning pin 11 is connected to the threaded hole through a thread, and the height and flatness of the fixture 7 can be fine-tuned. The specific position of the fixture 7 can be accurately fixed by the positioning pin 11 according to the length of the workpiece 30 to be measured.

[0036] As an optional solution, the distance sensor 12 in this embodiment is a grating sensor, and the indicator grating of the grating sensor is connected to the mobile detection plate 6. A slide groove is provided on the test platform 1. The slide 15 of the ball screw module 13 passes through the slide groove and is connected to the indicator grating. It is displaced with the linear displacement of the mobile detection plate 6. The scale grating is fixedly connected to the bottom surface of the test platform 1. The two form moiré fringes through relative displacement to achieve distance measurement. It can be installed according to the conventional installation method of grating sensors in this field. Among them, the distance sensor 12 is a high-precision grating sensor with an accuracy of 0.1μm, which is used to obtain the dimensional data of the workpiece 30 to be measured. Multi-sensor fusion measurement ensures that the repeatability error range is within 0.005mm and the detection cycle range is within 15 seconds / piece. The distance sensor 12 and other sensors are fixed to the platform through waist-shaped holes 26 and bolts 20, which can achieve fine-tuning of the installation position to ensure the optimal measurement position and angle.

[0037] As an optional solution, a cylindrical positioning block 4 is detachably connected to the top of the fixed detection plate 3 in this embodiment via a bolt 20. The radius of the cylindrical positioning block 4 is provided in different models and can be replaced to match the radius of the through hole of the workpiece 30 to be tested. In this embodiment, the cylindrical positioning block 4 is used to engage the circular hole at the end of the workpiece 30 to be tested for positioning. By measuring the distance between the hole and the end of the workpiece 30 to be tested, the radius of the circular hole at the end of the workpiece 30 to be tested can be measured separately, and combined with the reading of the distance sensor 12, the distance between the hole and the end of the workpiece 30 to be tested can be obtained.

[0038] As an optional solution, in this embodiment, translation mechanism 5 includes a ball screw module 13 and a servo motor 14. The lead screw of ball screw module 13 is connected to servo motor 14, and slide 15 is connected to mobile detection plate 6, thereby achieving linear movement of mobile detection plate 6. In this embodiment, the stroke of ball screw module 13 is preferably 500 mm, and the accuracy is preferably 0.1 μm. The high control angle of servo motor 14 can improve the measurement accuracy of workpiece dimensions.

[0039] As an optional solution, in this embodiment, the ball screw module 13 is provided with a limit switch 18 at the end closest to the servo motor 14 and a fixed detection plate 3 at the end further away from the servo motor 14. The limit switch 18 is used to limit the maximum displacement of the movable detection plate 6 and is communicatively connected to the control main box 2. The position of the limit switch 18 can serve as the initial position of the fixed detection plate 3. After each workpiece measurement, the fixed detection plate 3 returns to the limit switch 18. The limit switches 18 can also be installed at both ends of the ball screw module to detect the extreme position of the slider 23 and prevent the slide 15 from exceeding the travel range of the screw.

[0040] As an optional solution, in this embodiment, a linear track 17 is provided below the ball screw module 13, a track groove 16 (or a single-sided guide plate) is provided below the slide 15, and the upper baffle 19 is connected to the movable detection plate 6 by a bolt 20, and a spring 21 is provided between the baffle 19 and the nut of the bolt 20. The diameter of the through hole on the baffle 19 is larger than the diameter of the bolt 20, so that it can directly act on the movable detection plate 6 through the elastic force of the spring 21, and the movable detection plate 6 can be adaptively adjusted to fit the baffle 19 so that the movable detection plate 6 is in a vertical state. By adjusting the depth of the bolt 20 screwed into the movable detection plate 6, the fit of the movable detection plate 6 can be adjusted to ensure measurement accuracy. The track groove 16 slides and matches on the linear track 17, limits the slide 15 circumferentially, and guides it in a straight line direction to prevent it from rotating.

[0041] As an optional solution, in this embodiment, a plurality of mounting holes 22 are provided on one side of the linear rail 17 along the length direction, and the limit switch 18 is connected to the mounting hole 22 by a bolt 20. The position of the limit switch 18 can be adjusted when measuring different workpieces 30 to be measured, so as to avoid the ball screw module 13 running too long a distance each time when measuring small-sized workpieces, thereby improving measurement efficiency and saving energy.

[0042] As an optional solution, in this embodiment, a slider 23 is further provided on the lead screw of the ball screw module 13, and the slide 15 is slidably mounted on the lead screw. The slider 23 is closer to the servo motor 14 than the slide 15. A spring 21 in a compressed state is connected between the slider 23 and the slide 15 via a slot, so that the spring 21 always produces a tail-end resistance against the slide 15, facilitating a better fit between the mobile detection plate 6 and the end face of the workpiece 30 to be measured, further ensuring measurement accuracy. Among them, the two sides of the slider 23 are respectively connected to the slide 15 by a connecting plate 25, and the connecting plate 25 is provided with a waist-shaped hole 26. The bolt 20 of the slider 23 and the slide 15 is slidably mounted in the waist-shaped hole 26, which can not only ensure that the slider 23 drives the slide 15 to move along the axial direction of the lead screw, but also keep the spring 21 in a compressed state when the mobile detection plate 6 fits the end face of the workpiece 30 to be measured.

[0043] As an optional solution, in this embodiment, a pressure sensor 24 is connected to the slider 23. The pressure sensor 24 can contact the slide 15 to apply a squeezing force to the slide 15 and the mobile detection plate 6, so that the two ends of the workpiece 30 to be measured are fully in contact with the mobile detection plate 6 and the fixed detection plate 3, respectively, to avoid inaccurate measurement data caused by virtual contact. The pressure sensor 24 is connected to the control host box 2. When the pressure sensor 24 senses pressure, the distance sensor 12 outputs an accurate distance value. The pressure sensor 24 can also be a laser distance sensor. When the laser distance sensor outputs a distance value of 0, the distance sensor 12 connected to the mobile detection plate 6 outputs an accurate distance value. The spacing between the slider 23 and the slide 15 is 3mm-6mm, preferably 5mm.

[0044] As an optional solution, in this embodiment, the test platform 1 and the control host box 2 are both mounted on a mobile cart 29. The control host box 2 is equipped with a touch screen display, a failed product alarm indicator, and a clear alarm button. The control host box 2 is placed on one side of the ball screw module 13 and is connected to the various sensors and drive modules via cables. It is used to receive and process sensor signals and calculate and display the length dimensions of the tested product.

[0045] As an optional solution, the four corners of the test platform 1 in this embodiment are connected to a base 28 via height adjustment bolts 27. A mobile trolley 29 is preferably provided with an anti-static substrate to prevent static electricity. The test platform 1 is positioned on the trolley 29 using a four-point positioning method. The level of the test platform 1 can be adjusted using the height adjustment bolts 27. The wheels of the trolley 29 are preferably universal wheels with brakes for ease of movement and interference resistance. The base 28 of the test platform 1 is connected to a shock-absorbing pad to ensure stability during operation and movement. The test platform 1 has a measuring stroke of at least 500 mm and is suitable for a wide variety of workpieces 30 to be tested, covering a wide range of sizes.

[0046] This embodiment proposes a length testing tool that adapts to the measurement needs of different types of objects through modular design and flexible sensor configuration, reducing dependence on special tooling. The application of a high-precision positioning system and a fine adjustment mechanism significantly improves the accuracy of the measurement results, especially when processing objects with complex geometric shapes. It is equipped with a shock-absorbing base 28, a rigid bracket and an anti-static base plate mobile trolley to further improve structural stability and achieve flexible workshop layout.

[0047] Example 2

[0048] This embodiment provides a method for using a length testing tool, which is specifically as follows:

[0049] Place the length test fixture on the mobile trolley 29, move the mobile trolley 29 to the designated position and lock the universal wheel. First, turn on the servo motor 14, fit the mobile detection plate 6 with the surface of the fixed detection plate 3, and clear the measurement data of the control host box 2. Then adjust the installation position of the positioning pin 11 and the V-shaped fixture 7 according to the length of the workpiece 30 to be measured, place the workpiece 30 to be measured on the V-shaped fixture 7, turn on the switch of the control host box 2, and after the workpiece sensing sensor 9 detects that the workpiece 30 to be measured is placed, it sends a signal to the control host box 2. The control host box 2 controls the servo motor 14 to start, driving the slide 15 and the slider 23 on the ball screw module to move, and the pressure sensor 24 and the grating sensor move accordingly. During the movement, the grating sensor feeds back the position information of the slider 23 to the control host box 2 in real time to achieve the length measurement of the workpiece 30 to be measured. The mobile detection plate 6 can make initial contact during the movement of the ball screw module (there may be uneven contact), and then the slider 23 continues to move on the ball screw module, and the spring 21 squeezes the slide 15 where the mobile detection plate 6 is located. When the two ends of the workpiece 30 to be measured are fully in contact with the mobile detection plate 6 and the fixed detection plate 3 respectively, the pressure sensor 24 contacts the slide 15 and transmits the signal to the control host box 2. The control host box 2 records the measurement data of the grating sensor and stops the rotation of the servo motor 14. The measurement data obtained at this time is more accurate measurement data. The control host box 2 collects the data from each sensor, calculates the exact length of the workpiece 30 to be measured after algorithm processing, and displays the measurement results on the display. After measuring a workpiece, if the workpiece passes, the ball screw module drives the mobile detection plate 6 to reset to its initial position, i.e., the position of the limit switch 18. When the slider 23 of the ball screw module approaches the limit switch 18, a signal is sent to the control main box 2, causing the servo motor 14 to stop rotating, preventing the slider 23 from exceeding the travel range and ensuring the safety and stability of the measurement process. If the workpiece fails, the alarm indicator on the control main box 2 emits sound and light to prompt the operator to place the workpiece with the failed products. At this time, the operator needs to press the alarm release button to resume operation, avoiding the operator having to place the workpiece with the qualified products.

[0050] This embodiment can be used for automatic detection of the length dimensions of bushings, oil reservoirs, and connecting rod assemblies in automobile shock absorber precision machinery, thereby realizing rapid measurement and data determination of the length dimensions of bushings, oil reservoirs, and connecting rods.

[0051] Throughout this specification, references to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "this embodiment," "specific examples," or "some examples" indicate that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0052] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A length testing tool, characterized by: The invention comprises a test platform, a translation mechanism, a fixed detection plate, a mobile detection plate, a fixture, a distance measuring sensor and a control host box, wherein the translation mechanism is provided on the test platform, one end of the translation mechanism is connected to the fixed detection plate, the mobile detection plate is slidably provided on the translation mechanism, the fixed detection plate and the mobile detection plate are arranged relative to and can fit together, the fixture is detachably connected to the test platform, and when measuring the size of the workpiece to be measured, the fixture is located between the fixed detection plate and the mobile detection plate, the distance measuring sensor is connected to the mobile detection plate and the test platform, and is used to detect the distance between the mobile detection plate and the fixed detection plate, and the translation mechanism, the distance measuring sensor and the control host box are all capable of communication connection; The translation mechanism includes a ball screw module and a servo motor, the screw of the ball screw module is connected to the servo motor, and the slide is connected to the mobile detection plate; a limit switch is provided at one end of the ball screw module close to the servo motor, and the fixed detection plate is provided at the other end away from the servo motor, the limit switch is used to limit the maximum displacement of the mobile detection plate, and the limit switch is communicatively connected to the control host box; A linear track is provided at the bottom of the ball screw module, a track groove is provided at the bottom of the slide, and the moving detection plate is connected to the upper baffle by bolts, a spring is provided between the baffle and the nut of the bolt, the through hole diameter on the baffle is larger than the diameter of the bolt, and the track groove slides and matches the linear track; a plurality of mounting holes are provided on one side of the linear track along the length direction, and the limit switch is connected to the mounting hole by bolts; a slider is also provided on the screw of the ball screw module, and the slide is slidably sleeved on the screw, and the slider is closer to the servo motor than the slide, and a spring in a compressed state is connected between the slider and the slide through a slot; a pressure sensor is connected to the slider, and the pressure sensor can conflict with the slide, and the pressure sensor is communicatively connected to the control host box.

2. The length testing tool according to claim 1, characterized in that: The upper surface of the fixture is provided with a material discharge trough, which is used to place the workpiece to be measured; the material discharge trough is V-shaped, arc-shaped or rectangular; the fixture is provided with several models of different sizes, and each model of the fixture is used to match a workpiece to be measured; the fixture is provided with at least one, and the axis of the workpiece to be measured is parallel to the center line of the translation mechanism.

3. The length testing tool according to claim 2, characterized in that: A workpiece sensing sensor is provided on the discharge trough, and the workpiece sensing sensor is used to detect whether the workpiece to be tested is placed in the discharge trough; the workpiece sensing sensor includes a proximity switch or a photoelectric switch, and the workpiece sensing sensor can be communicatively connected to the control host box.

4. The length testing tool according to claim 1, characterized in that: The bottom surface of the fixture is higher than the translation mechanism. The test platform is provided with a plurality of connecting holes along the moving direction of the translation mechanism. The bottom of the fixture is detachably connected to the connecting holes through a pair of positioning pins.

5. The length testing tool according to claim 1, characterized in that: The distance measuring sensor is a grating sensor, and the indicator grating of the grating sensor is connected to the mobile detection plate, and the scale grating is fixedly connected to the bottom surface of the test platform; the top of the fixed detection plate is detachably connected to a cylindrical positioning block by bolts, and the radius of the cylindrical positioning block can match the through-hole radius of the workpiece to be measured.

6. The length testing tool according to claim 1, characterized in that: The distance between the slider and the slide seat is 3mm-6mm.

7. The length testing tool according to claim 1, characterized in that: The test platform and the control host box are both set on a mobile cart. The control host box is provided with a touch operation display screen, an alarm prompt for unqualified products and an alarm release button; the four corners of the test platform are respectively connected to the ground through height adjustment bolts, and the mobile cart is provided with an anti-static substrate.

Images