Detection device

Abstract

The utility model belongs to the technical field of membrane material detection, and particularly relates to a detection device which comprises a base, a measuring support, a driving assembly, a first measuring module and a first calibration module, the measuring support is movably installed on the base, and the driving assembly is installed on the base and connected with the measuring support; the first measuring module is used for driving the measuring support to reciprocate in the first direction, the first measuring module is installed on the measuring support and synchronously moves along with the measuring support to form a first measuring interval, the first measuring interval comprises a first acceleration and deceleration interval, a second acceleration and deceleration interval and a first uniform motion interval, and the first calibration module is connected with the base. And the motor is located in a first uniform-speed motion interval. As the first calibration module is arranged in the constant-speed motion interval, the first measurement module is calibrated on line during measurement, the calibration frequency is improved, the reliability and accuracy of the measurement module can be effectively improved, the calibration process is saved, the measurement efficiency of the measurement module is improved, and the productivity of the whole production line is improved.

Description

Technical Field

[0001] The present application relates to the technical field of non-destructive testing, and more specifically to a testing device. Background Art

[0002] It's well known that after long-term use, measuring equipment can become less reliable and accurate due to environmental factors such as temperature, humidity, and vibration. Therefore, measuring equipment needs to be calibrated after a period of use. Currently, this is often done by moving the measuring equipment to a specific calibration area and using calibration equipment. However, this method has some drawbacks. The calibration process requires pausing the production line's measurement process. As the frequency of calibration increases, the efficiency of the measuring equipment decreases significantly, impacting the production capacity of the entire production line. Utility Model Content

[0003] The present application provides a detection device that can realize online calibration of a measurement module, thereby improving the reliability and accuracy of the measurement module, while also effectively ensuring the efficiency of the measurement mechanism.

[0004] The present application provides a detection device, comprising:

[0005] base;

[0006] a measuring bracket movably mounted on the base;

[0007] a driving assembly mounted on the base and connected to the measuring bracket, for driving the measuring bracket to reciprocate in a first direction;

[0008] a first measurement module, the first measurement module being mounted on the measurement bracket; the first measurement module moving synchronously with the measurement bracket to form a first measurement interval; the first measurement interval comprising a first acceleration / deceleration interval and a second acceleration / deceleration interval, and a first uniform motion interval located between the first acceleration / deceleration interval and the second acceleration / deceleration interval; and

[0009] A first calibration module is connected to the base and is located in the first uniform motion interval.

[0010] In one embodiment, it further includes a second measurement module and a second calibration module;

[0011] The second measurement module is mounted on the measurement bracket; the second measurement module moves synchronously with the measurement bracket to form a second measurement interval; the second measurement interval includes a third acceleration / deceleration interval and a fourth acceleration / deceleration interval, and a second uniform motion interval located between the third acceleration / deceleration interval and the fourth acceleration / deceleration interval;

[0012] The second calibration module is connected to the base and is located in the second uniform motion interval.

[0013] In one embodiment, the movement range of the measuring bracket is D, the distance between the first measuring module and the second measuring module in the first direction is L, and L <D。

[0014] In one embodiment, the length of the first acceleration / deceleration interval is M, and the length of the second acceleration / deceleration interval is N, satisfying (M+N) / 2<DL.

[0015] In one embodiment, the length M of the first acceleration / deceleration interval and the length N of the second acceleration / deceleration interval satisfy M+N<DL.

[0016] In one embodiment, the length of the first acceleration / deceleration interval is M, and the length of the second acceleration / deceleration interval is N, and M=N.

[0017] In one embodiment, the measuring bracket has a slot extending along the first direction, and the slot is arranged to pass through the measuring bracket along the second direction; the first measuring module and the second measuring module both include a first measuring component and a second measuring component, and the first measuring component and the second measuring component are arranged on both sides of the slot relative to each other along the third direction; the first direction, the second direction and the third direction are perpendicular to each other.

[0018] In one embodiment, the measuring bracket is a flat circumferentially closed structure; the notch is a hollow area of the circumferentially closed structure.

[0019] In one embodiment, the first measurement component includes a laser transmitter, and the second measurement component includes a laser receiver.

[0020] In one embodiment, the first measuring component includes an ultrasonic transmitter, and the second measuring component includes an ultrasonic receiver.

[0021] According to the detection device in the above embodiment, it includes a base, a measuring bracket, a drive assembly, a first measuring module, and a first calibration module. The drive assembly can drive the measuring bracket to reciprocate in a first direction, so that the first measuring module moves synchronously with the measuring bracket to form a first measurement interval. The first measurement interval includes a first acceleration and deceleration interval, a second acceleration and deceleration interval, and a first uniform motion interval. The first calibration module is arranged in the first uniform motion interval. Since the first calibration module is arranged in the first uniform motion interval, it can be calibrated online during the measurement process of the first measuring module, thereby increasing the frequency of calibration and effectively improving the reliability and accuracy of the measuring module. At the same time, online calibration can save calibration steps and improve calibration efficiency, thereby improving the measurement efficiency of the measuring module and improving the production capacity of the entire production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a detection device in an embodiment;

[0023] Figure 2 This is a structural front view of a detection device in one embodiment;

[0024] Figure 3 Schematic diagram of the motion trajectories of two measurement modules in the first embodiment;

[0025] Figure 4 Schematic diagram of the motion trajectories of two measurement modules in the second embodiment;

[0026] Figure 5 Schematic diagram of the motion trajectories of two measurement modules in the third embodiment.

[0027] Among them: 100, base; 200, measuring bracket; 210, notch; 300, drive assembly; 310, drive motor; 320, screw; 400, measuring module; 410, first measuring module; 420, second measuring module; 430, first measuring assembly; 440, second measuring assembly; 500, calibration module; 510, first calibration module; 520, second calibration module; 600, guide rail; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0028] The present application is further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail. They can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0029] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various implementations, and the operational steps involved in each embodiment may be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing a particular embodiment and do not imply a required composition and / or sequence.

[0030] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0031] Existing measuring equipment can be used to detect the thickness, surface density, surface flatness, surface damage or internal damage of membrane materials (such as diaphragms) or sheet materials (such as electrodes). During the measurement process, due to the influence of external environmental factors (such as temperature, humidity, vibration, etc.), as the detection time increases, the measuring equipment will have inaccurate and distorted detection results. In order to solve this problem, a separate calibration area is set up. After a certain measurement cycle, the measuring equipment is stopped and moved to the calibration area for calibrating the measuring equipment. However, this calibration method will increase the number and time of downtime as the calibration frequency increases, thereby affecting the production efficiency of membrane or sheet materials.

[0032] The present application provides a detection device that can be calibrated in real time and online, that is, the calibration work is completed during the detection process without stopping the detection work, thereby effectively ensuring the reliability and accuracy of the measurement data while effectively ensuring production efficiency.

[0033] See also Figures 1 to 5 The detection device includes a base 100, a measuring bracket 200, a driving assembly 300, a measuring module 400 and a calibration module 500. The measuring bracket 200 is movably mounted on the base 100. The driving assembly 300 is mounted on the base 100 and connected to the measuring bracket 200 to drive the measuring bracket 200 to reciprocate along a first direction X. The measuring module 400 is mounted on the measuring bracket 200 and moves synchronously with the measuring bracket 200 to form a measuring interval between a first measuring position and a second measuring position. The calibration module 500 is connected to the base 100 and is arranged between the first measuring position and the second measuring position. When the measuring module 400 moves and switches between the first measuring position and the second measuring position, the measuring module 400 passes through the calibration module 500, and the measuring module 400 is checked and calibrated by the calibration module 500. The measuring module 400 works continuously between the first measuring position and the second measuring position without affecting the normal operation of the measuring module 400, thereby avoiding the influence of calibration on work efficiency.

[0034] Furthermore, the measurement interval formed between the first measurement position and the second measurement position includes at least two acceleration and deceleration motion intervals and at least one uniform speed motion interval, and each uniform speed motion interval is located between two adjacent acceleration and deceleration motion intervals.

[0035] In one embodiment, the measurement interval includes two acceleration and deceleration motion intervals and one uniform speed motion interval, and the uniform speed motion interval is located between the two acceleration and deceleration motion intervals.

[0036] It can be understood that when the measuring bracket 200 starts to move, it will accelerate to a preset speed with a certain acceleration, and will decelerate until it stops after moving a certain distance at the preset speed. Therefore, the motion trajectory formed during the entire movement process is divided into two acceleration and deceleration motion intervals and a uniform speed motion interval. Since the measuring module 400 is set on the measuring bracket 200, it can move synchronously with the measuring bracket 200. The measuring module 400 performs uniform speed detection on the film or sheet material in the uniform speed motion interval, and can also detect the film or sheet material at a changing speed in the two acceleration and deceleration motion intervals.

[0037] The calibration module 500 is set in the uniform motion range, so that the measurement module 400 passes through the calibration module 500 at a preset speed, avoiding the deviation between the theoretical position calculated according to the measurement data and the actual position (the spatial position between the first measurement position and the second measurement position) due to the influence of measurement frequency and movement speed, resulting in the theoretical position calculated according to the measurement module 400 being located at the position where the calibration module 500 is located, but the actual real position deviates from the position where the calibration module 500 is located, the calibration loses its meaning, and the purpose of improving the detection reliability and accuracy through calibration is not achieved. Alternatively, the theoretically calculated position is mistakenly used as the position of the calibration module 500, and the data measured here is used as the standard data for calibration, resulting in the product being far from the actual requirements, which will seriously affect the production of the subsequent production line.

[0038] In one embodiment, the measurement module 400 includes a first measurement module 410, and the calibration module 500 includes a first calibration module 510. The first measurement module 410 moves synchronously with the measurement bracket 200 to form a first measurement interval S1. The first measurement interval S1 includes a first acceleration / deceleration interval S11 and a second acceleration / deceleration interval S13, and a first uniform motion interval S12 located between the first acceleration / deceleration interval S11 and the second acceleration / deceleration interval S13. The first calibration module 510 is located in the first uniform motion interval S12, and can perform online calibration of the first measurement module 410. In this embodiment, there can be one or more first measurement modules 410, and each first measurement module 410 can be provided with at least one first calibration module 510, so that each first measurement module 410 can be calibrated independently without interfering with each other. By comparing the data between the first calibration modules 510, the calibration accuracy can be improved.

[0039] In one embodiment, the measurement module 400 further includes a second measurement module 420, and the calibration module 500 further includes a second calibration module 520. The second measurement module 420 moves synchronously with the measurement bracket 200 to form a second measurement interval S2. The second measurement interval S2 includes a third acceleration / deceleration interval S21 and a fourth acceleration / deceleration interval S23, as well as a second uniform motion interval S22 located between the third acceleration / deceleration interval S21 and the fourth acceleration / deceleration interval S23. The second calibration module 520 is located in the second uniform motion interval S22 and can perform online calibration of the second measurement module 420. Similarly, in this embodiment, there can be one or more second measurement modules 420, and each second measurement module 420 can be provided with at least one second calibration module 520, so that each second measurement module 420 can be independently calibrated without interfering with each other. By comparing data between the second calibration modules 520, the calibration accuracy can be improved.

[0040] In some specific embodiments, to ensure data consistency, the parameters (including acceleration, velocity, acquisition frequency, etc.) and performance of the first measurement module 410 and the second measurement module 420 are identical. The configuration of the first measurement module 410 and the second measurement module 420 can improve measurement efficiency, but there is also the possibility of reduced accuracy.

[0041] It should be understood that the acquisition frequency of the first measurement module 410 and the second measurement module 420 is fixed, that is, the first measurement module 410 and the second measurement module 420 collect data at a constant speed at a preset frequency, but the movement speed of the first measurement module 410 and the second measurement module 420 is constantly changing in the acceleration and deceleration interval, which leads to the following situation in the acceleration and deceleration interval: although the time interval between the data collected by the first measurement module 410 and the second measurement module 420 is the same (fixed frequency), the corresponding spatial distance between the data (change in movement speed) is not completely consistent. Once the corresponding spatial distance between the data is not completely consistent, a position deviation will gradually occur between the theoretical position (in space) calculated by the amount of data and its actual position, and as more data in the acceleration and deceleration interval is included, the position deviation will also increase, thereby reducing the accuracy of the detection data of the detection device.

[0042] In order to solve the problem that the more data of the acceleration and deceleration motion interval is counted, the greater the position deviation is, and the lower the accuracy of the detection data of the detection device is, through the reasonable design of the distance between the first measurement module 410 and the second measurement module 420 and the motion stroke of the measuring bracket 200, the data of the acceleration and deceleration motion interval is reduced, thereby reducing the position deviation and improving the detection accuracy of the detection device.

[0043] In one embodiment, the distance between the first measurement module 410 and the second measurement module 420 in the first direction X is L. Please refer to Figure 2 and Figure 3 , the movement stroke of the measurement bracket 200 is D, that is, the length of the first measurement interval S1 of the first measurement module 410 in the first direction X is D, and the length of the second measurement interval S2 of the second measurement module 420 in the first direction X is also D. It satisfies L < D, so that there is a partial overlap between the second acceleration / deceleration movement interval S13 of the first measurement module 410 and the third acceleration / deceleration movement interval S21 of the second measurement module 420, that is, the shaded area A in the figure. Only the measurement data of one of the measurement modules 400 in this part needs to be included in the area A, thus reducing the data included in the acceleration / deceleration movement interval and improving the accuracy of the measurement data. Therefore, it is possible to reduce the data included in the measurement during the acceleration / deceleration movement interval, reduce the position deviation between the theoretical position corresponding to the measurement data and its actual position, and improve the accuracy of the detection device.

[0044] In one embodiment, the length of the first acceleration / deceleration interval S11 is M, and the lengths of the second acceleration / deceleration intervals S13 are both N, satisfying (M + N) / 2 < D - L. This can not only make there be an overlapping area between the first measurement module 410 and the second measurement module 420, but also make a part of the acceleration / deceleration interval of one of the first measurement module 410 and the second measurement module 420 fall into the constant-speed interval of the other. In this way, the data in the constant-speed movement interval in the overlapping area can be used to replace the data in the acceleration / deceleration movement interval to further reduce the data included in the acceleration / deceleration movement interval, thereby further reducing the position deviation between the theoretical position corresponding to the measurement data and its actual position and improving the accuracy of the detection device. In this embodiment, the parameters of the first measurement module 410 and the second measurement module 420 can be the same or different. For example, if the parameters of the first measurement module 410 and the second measurement module 420 are the same, that is, the length of the third acceleration / deceleration interval S21 is M and the length of the fourth acceleration / deceleration interval S23 is N, it can ensure the consistency of the measurement results and further improve the measurement accuracy.

[0045] Specifically, please refer to Figure 4There is an overlapping area between the first measurement module 410 and the second measurement module 420, and the overlapping area includes the overlapping part of the second acceleration / deceleration motion interval S13 of the first measurement module 410 and the third acceleration / deceleration motion interval S21 of the second measurement module 420, that is, the shaded area A in the figure, and also includes a partial overlap between the third acceleration / deceleration motion interval S21 of the second measurement module 420 and the first uniform speed motion interval S12 of the first measurement module 410, that is, the shaded area B1 in the figure, and also includes a partial overlap between the second acceleration / deceleration motion interval S13 of the first measurement module 410 and the second uniform speed motion interval S22 of the second measurement module 420, that is, the shaded area B2 in the figure. In the shaded area B1, the data measured at a uniform speed by the first measurement module 410 can replace the data measured at an acceleration / deceleration by the second measurement module 420, and in the shaded area B2, the data measured at a uniform speed by the second measurement module 420 can replace the data measured at an acceleration / deceleration by the first measurement module 410, thereby reducing the data included in the acceleration / deceleration motion interval and further improving the accuracy of the measurement data.

[0046] In one embodiment, the length of the first acceleration / deceleration interval S11 is M, and the length of the second acceleration / deceleration interval S13 is N, satisfying M+N<DL. This not only allows the first measurement module 410 and the second measurement module 420 to have an overlapping area, but also allows the acceleration / deceleration interval of one of the first measurement module 410 and the second measurement module 420 to completely fall within the uniform speed interval of the other. In this way, the data of the uniform speed interval in this area can be used to replace the data of the acceleration / deceleration interval, thereby further reducing the data included in the acceleration / deceleration interval, thereby further reducing the position deviation between the theoretical position corresponding to the measurement data and its actual position, and improving the accuracy of the detection device. In this embodiment, with reference to the above embodiment, the parameters of the first measurement module 410 and the second measurement module 420 can be the same or different, and will not be repeated here.

[0047] Specifically, the third acceleration and deceleration motion interval S21 of the second measurement module 420 falls within the first uniform speed motion interval S12 of the first measurement module 410, that is, the shaded C1 area in the figure, and the second acceleration and deceleration motion interval S13 of the first measurement module 410 just falls completely within the second uniform speed motion interval S22 of the second measurement module 420, that is, the shaded C2 area in the figure. In the shaded C1 area, the data measured at a uniform speed by the first measurement module 410 can replace the data measured at an acceleration and deceleration by the second measurement module 420, and in the shaded C2 area, the data measured at a uniform speed by the second measurement module 420 can replace the data measured at an acceleration and deceleration by the first measurement module 410, thereby reducing the data included in the acceleration and deceleration motion intervals and further improving the accuracy of the measurement data.

[0048] Of course, see Figure 5In other embodiments, the third acceleration / deceleration motion interval S21 of the second measurement module 420 completely falls within the first uniform speed motion interval S12 of the first measurement module 410, the second acceleration / deceleration motion interval S13 of the first measurement module 410 completely falls within the second uniform speed motion interval S22 of the second measurement module 420, and there is also an overlapping area C3 within the first uniform speed motion interval S12 of the first measurement module 410 and the second uniform speed motion interval S22 of the second measurement module 420.

[0049] In one embodiment, the length M of the first acceleration / deceleration interval S11 and the length N of the second acceleration / deceleration interval S13 satisfy M=N. The first measurement module 410 has the same acceleration in the first acceleration / deceleration interval S11 and the second acceleration / deceleration interval S13, and the overlapping area remains consistent during reciprocating motion, which can further reduce the data counted and improve measurement accuracy.

[0050] In some embodiments, the calibration module 500 includes a calibration block. When the measurement module 400 passes through the calibration block, it can measure the block to obtain measurement data, and the measurement data is used as a basis for calibrating the measurement module 400.

[0051] Specifically, the calibration block serves as a reference control object. Ideally, the performance, appearance and other data of the calibration block will not change. Using this data as reference data, the measurement module 400 will measure actual data after passing through the calibration block. By comparing the actual data with the reference data, it can be determined whether there is a deviation in the measurement module 400, and then the measurement module 400 is adjusted to reduce the deviation between the actual data it measures and the reference data of the calibration block.

[0052] In some embodiments, the calibration module 500 also includes a mounting bracket, which is arranged on the base 100, and the calibration block is arranged on the mounting bracket. Each measurement module 400 is provided with at least one calibration block, and the calibration block is arranged in a uniform motion range to reduce measurement errors caused by motion speed.

[0053] In some embodiments, the measuring bracket 200 has a slot 210 extending along a first direction X, and the slot 210 is arranged to pass through the measuring bracket 200 along a second direction Y. The second direction Y is also the feeding direction of the film or sheet. The slot 210 is a straight slot 210 for allowing the film or sheet to pass through. The first direction X and the second direction Y are perpendicular to each other.

[0054] In some embodiments, the measurement module 400 includes a first measurement assembly 430 and a second measurement assembly 440. The first measurement assembly 430 and the second measurement assembly 440 are arranged on opposite sides of the slot 210 along the third direction Z. This allows a film or sheet passing through the slot 210 along the second direction Y to be positioned between the first measurement assembly 430 and the second measurement assembly 440. The first measurement assembly 430 and the second measurement assembly 440 cooperate to measure the film or sheet. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0055] In some embodiments, the measurement bracket 200 is a flat, circumferentially closed structure; the notch 210 is the hollow area within the circumferentially closed structure. The measurement bracket 200 can be a flat, O-shaped structure, which helps reduce space usage. The circumferentially closed structure provides space for film or sheet material to pass through without requiring additional support structures. This circumferentially closed structure also provides support for the first measurement assembly 430 and the second measurement assembly 440, respectively. The circumferentially closed structure itself supports each other, evenly distributing force, eliminating deformation caused by uneven stress and ensuring a stable placement of the measurement module 400, thereby preventing any impact on measurement results.

[0056] In some embodiments, the first measuring component 430 includes a laser emitter, and the second measuring component 440 includes a laser receiver. The first measuring component 430 and the second measuring component 440 are relatively arranged on both sides of the slot 210 along the third direction Z, so that the film or sheet passing through the slot 210 along the second direction Y can be located between the first measuring component 430 and the second measuring component 440. After the laser emitter emits laser light through the film or sheet, it is received by the laser receiver, and the thickness, density, etc. of the film or sheet can be measured through the laser.

[0057] It should be understood that the calibration block serves as a reference object for calibration, and the measurement module 400 measures it in the same manner as that used for measuring a film or sheet.

[0058] In some embodiments, the first measurement component 430 includes an ultrasonic transmitter, and the second measurement component 440 includes an ultrasonic receiver, which can be used to ultrasonically measure internal defects in a film or sheet. Of course, in other embodiments, the first measurement component 430 and the second measurement component 440 can also be image sensors, which can be used to measure the surface quality of the film or sheet.

[0059] In one embodiment, the film material inspection device further includes a guide rail 600 disposed on the base 100. The measuring bracket 200 is slidably disposed on the guide rail 600. The drive assembly 300 is capable of driving the measuring bracket 200 to slide along the guide rail 600. The provision of the guide rail 600 can improve the stability and accuracy of the movement of the measuring bracket 200, thereby improving the accuracy of data measurement. The guide rail 600 is disposed parallel to the linear slot 210 and perpendicular to the direction of travel of the film material.

[0060] In one embodiment, the drive assembly 300 includes a drive motor 310 and a screw rod 320. The output end of the drive motor 310 is connected to the screw rod 320. The screw rod 320 is rotatably set on the base 100. The mounting frame 200 is movably connected to the screw rod 320. The drive motor 310 can drive the screw rod 320 to rotate, so as to drive the mounting frame 200 to perform linear reciprocating motion along the axis of the screw rod 320. The screw rod 320 is set parallel to the guide rail 600.

[0061] The above specific examples are used to illustrate the present application, which is only used to help understand the present application and is not intended to limit the present application. For those skilled in the art of the present application, based on the concept of the present application, they can also make some simple deductions, modifications or substitutions.

Claims

1. A detection device, characterized in that: include: base; a measuring bracket movably mounted on the base; a driving assembly mounted on the base and connected to the measuring bracket, for driving the measuring bracket to reciprocate in a first direction; a first measurement module, the first measurement module being mounted on the measurement bracket; the first measurement module moving synchronously with the measurement bracket to form a first measurement interval; the first measurement interval comprising a first acceleration / deceleration interval and a second acceleration / deceleration interval, and a first uniform motion interval located between the first acceleration / deceleration interval and the second acceleration / deceleration interval; as well as A first calibration module is connected to the base and is located in the first uniform motion interval.

2. The detection device according to claim 1, characterized in that Also included is a second measurement module and a second calibration module; The second measurement module is mounted on the measurement bracket; the second measurement module moves synchronously with the measurement bracket to form a second measurement interval; the second measurement interval includes a third acceleration / deceleration interval and a fourth acceleration / deceleration interval, and a second uniform motion interval located between the third acceleration / deceleration interval and the fourth acceleration / deceleration interval; The second calibration module is connected to the base and is located in the second uniform motion interval.

3. The detection device according to claim 2, characterized in that The movement range of the measuring bracket is D, the distance between the first measuring module and the second measuring module in the first direction is L, and L <D。 4. The detection device according to claim 3, characterized in that The length of the first acceleration / deceleration interval is M, and the length of the second acceleration / deceleration interval is N, satisfying (M+N) / 2<DL.

5. The detection device according to claim 4, characterized in that The length M of the first acceleration / deceleration interval and the length N of the second acceleration / deceleration interval satisfy M+N<DL.

6. The detection device according to claim 4 or 5, characterized in that: The length M of the first acceleration / deceleration interval and the length N of the second acceleration / deceleration interval satisfy M=N.

7. The detection device according to claim 2, characterized in that The measuring bracket has a slot extending along the first direction, and the slot is arranged to pass through the measuring bracket along the second direction; the first measuring module and the second measuring module each include a first measuring component and a second measuring component, and the first measuring component and the second measuring component are arranged on both sides of the slot relative to each other along the third direction; the first direction, the second direction and the third direction are perpendicular to each other.

8. The detection device according to claim 7, characterized in that The measuring bracket is a flat circumferentially closed structure; the notch is a hollow area of the circumferentially closed structure.

9. The detection device according to claim 7, characterized in that: The first measurement component includes a laser transmitter, and the second measurement component includes a laser receiver.

10. The detection device according to claim 7, characterized in that: The first measurement component includes an ultrasonic transmitter, and the second measurement component includes an ultrasonic receiver.

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