Length measuring device

Abstract

The utility model provides a length measuring device, in which a linear moving unit is used for linearly moving a laser receiving target and an optical positioning unit, and a laser ranging unit is used for projecting ranging laser towards the laser receiving target along the displacement direction of the linear moving unit. The optical positioning unit is used for optically positioning a measurement initial point position and a measurement termination point position of the to-be-measured sample, so that non-contact measurement of the to-be-measured sample is realized through related unit assemblies, and the phenomenon that the to-be-measured sample has a detection sample with an irregular shape is avoided; in addition, the length measuring device is relatively simple in measurement operation, and a closed detection space required by long grating equipment for measurement does not need to be additionally configured, so that the measurement accuracy of the length measuring device is improved, and the measurement accuracy of the length measuring device is improved. And the problem that the measurement efficiency is influenced when long grating equipment is used is solved.

Description

Technical Field

[0001] The present application belongs to the field of basic measurement technology, and more specifically, relates to a length measuring device. Background Art

[0002] In some inspection experiments, it is necessary to measure the length of the inspection sample. However, for some inspection samples with irregular shapes, or when the size value of a specific area in the inspection sample needs to be measured, the standard ruler of conventional contact measurement is often difficult to accurately align with the measurement point of the inspection sample, which affects the measurement accuracy. Although the above problems can be effectively solved by non-contact measurement of long grating equipment, the long grating equipment requires a completely enclosed measurement space to avoid external optical interference, and it also has high operating requirements for operators, which affects the measurement efficiency. Utility Model Content

[0003] The purpose of the present application is to provide a length measuring device, which aims to solve the problem that the standard ruler of the current conventional contact measurement is often difficult to accurately align with the measuring point of the test sample, thereby affecting the measurement accuracy, and the use of long grating equipment has high requirements on the detection environment and operation requirements, which affects the measurement cost and measurement efficiency.

[0004] To achieve the above object, a length measuring device is provided, comprising a measuring support platform, a laser distance measuring unit, a linear moving unit, a laser receiving target, an optical positioning unit and a sample positioning card plate, wherein the laser distance measuring unit and the sample positioning card plate are both fixedly arranged on the measuring support platform, the linear moving unit is movably arranged on the measuring support platform, and the laser receiving target and the optical positioning unit are both fixedly arranged on the linear moving unit;

[0005] The linear moving unit is used to synchronously linearly move the laser receiving target and the optical positioning unit. The laser ranging unit is used to project the ranging laser toward the laser receiving target along the displacement direction of the linear moving unit. The sample fixing clamp is used to abut and position the sample to be measured. The optical positioning unit is used to optically locate the measurement initial point and measurement end point of the sample to be measured.

[0006] In one embodiment, the length measuring device also includes a first level, a second level, multiple first leveling components and multiple second leveling components. The first level and each first leveling component are arranged on the measuring support platform for cooperating to adjust the level of the measuring support platform, and the second level and each second leveling component are arranged on the laser ranging unit for cooperating to adjust the level of the laser ranging unit.

[0007] In one embodiment, the first leveling assembly includes a first bolt and a first support leg disposed on the head of the first bolt, the first bolt is threadedly connected to the bottom of the measurement support platform along a vertical direction, and the first level is disposed on the top of the measurement support platform.

[0008] In one embodiment, the second leveling assembly includes a second bolt, a pre-tightening spring and a limit spring, the laser ranging unit includes a support bracket, a support base plate and a ranging body, the support bracket is arranged on the top of the measuring support platform, the ranging body is arranged on the top of the support base plate, the second bolt passes through the support base plate and is threadedly connected to the support bracket in the vertical direction, the pre-tightening spring ring is arranged on the second bolt and elastically abuts against the second bolt head and the side of the support base plate facing the second bolt head in the vertical direction, the limit spring ring is arranged on the second bolt and abuts against the side of the support base plate facing away from the second bolt head in the vertical direction, and the second level is arranged on the top of the support base plate.

[0009] In one embodiment, the laser ranging unit also includes a fixed wing plate and multiple horizontal adjustment components. The ranging body is arranged on the fixed wing plate. Each horizontal adjustment component is respectively connected to the fixed wing plate and the supporting base plate to lock or unlock the position of the ranging body relative to the supporting base plate in the horizontal direction.

[0010] In one embodiment, the horizontal adjustment assembly includes a third bolt and a locking nut, the fixed wing plate is provided with a plurality of first adjustment slots, the supporting base plate is provided with a plurality of second adjustment slots corresponding to each of the first adjustment slots, the third bolt is passed through the corresponding first adjustment slots, the second adjustment slots and the locking nut in sequence, and the minimum gap of the first adjustment slot and the minimum gap of the second adjustment slot are both greater than the diameter of the third bolt rod.

[0011] In one of the embodiments, a plurality of triangular guide rails are arranged in parallel pairs on the top of the measurement support platform, the linear moving unit includes a moving platform and a plurality of moving wheels arranged in pairs at intervals on the bottom of the moving platform, each moving wheel is provided with a guide ring groove adapted to the triangular contour at the top of the triangular guide rail to form a limiting fit with the corresponding triangular guide rail, and the laser receiving target and the optical positioning unit are fixedly arranged on the top of the moving platform.

[0012] In one embodiment, the length measuring device also includes one or more sequentially connected extension support platforms for connecting the extended measurement support platform along the extension direction of the triangular guide rail, and a third level and multiple third leveling components arranged on any of the extension support platforms for coordinating the adjustment of the horizontality of the corresponding extension support platform. A plurality of sections of extension guide rails for correspondingly connecting and extending each triangular guide rail are arranged in parallel in pairs on the top of any of the extension support platforms, and each of the moving wheel bodies is provided with a guide ring groove adapted to the triangular contour on the top of the extension guide rail to form a limiting fit with the corresponding extension guide rail.

[0013] In one of the embodiments, a plurality of receiving grooves are arranged in parallel pairs on the top of the measuring support platform, and one end of each receiving groove along its own extension direction penetrates through one side of the measuring support platform, and each triangular guide rail is fixedly arranged in each receiving groove in a one-to-one manner. A plurality of supplementary grooves are arranged in parallel pairs on the top of any supplementary support platform, and the opposite ends of each supplementary groove along its own extension direction penetrate through the two side sides of the supplementary support platform respectively for one-to-one connection and extension of each receiving groove, and each supplementary guide rail of any supplementary support platform is fixedly arranged in each corresponding supplementary groove in a one-to-one manner.

[0014] In one of the embodiments, a first fastener and a second fastener are respectively provided at the opposite ends of any compensating support platform along the extension direction of the compensating guide rail, and a second fastener is provided at the corresponding end of the measuring support platform along the extension direction of the triangular guide rail. The first fastener of any compensating support platform is used to be fastened and connected with the second fastener of the measuring support platform, or to be fastened and connected with the second fastener of other compensating support platforms.

[0015] In one embodiment, the first fastener includes a positioning pin shaft arranged on the side portion of the corresponding one side of the extension support platform, the second fastener includes a positioning axis hole arranged on the side portion of the corresponding one side of the extension support platform or the side portion of the corresponding one side of the measuring support platform, and a locking bolt arranged on the side portion of the corresponding other side of the extension support platform or the side portion of the corresponding other side of the measuring support platform, and the locking bolt is used to vertically abut and lock the corresponding positioning pin shaft extending into the corresponding positioning axis hole.

[0016] In one embodiment, the third leveling assembly includes a fourth bolt and a second support leg disposed on the head of the fourth bolt, the fourth bolt is threadedly connected to the bottom of the extended support platform along the vertical direction, and the third level is disposed on the top of the extended support platform.

[0017] The beneficial effect of the length measuring device provided by the present application lies in that, compared with the prior art, in the above-mentioned length measuring device, the linear moving unit is used to linearly move the laser receiving target and the optical positioning unit, the laser ranging unit is used to project the ranging laser toward the laser receiving target along the displacement direction of the linear moving unit, and the optical positioning unit is used to optically locate the measurement initial point and the measurement end point of the sample to be measured. In this way, the sample to be measured is directly placed on the measurement support platform, and then the laser receiving target and the optical positioning unit are synchronously moved by the linear moving unit until the optical positioning unit optically locates the initial measurement point of the sample to be measured, and the first ranging value of the laser ranging unit is recorded, and then the laser receiving target and the optical positioning unit are synchronously moved by the linear moving unit until the initial measurement point of the sample to be measured is reached. After the optical positioning unit optically locates the termination measurement point of the sample to be measured, the second distance measurement value of the laser ranging unit is recorded, and the difference between the first distance measurement value and the second distance measurement value is calculated to obtain the length dimension of the sample to be measured. It can be seen that the above-mentioned length measuring device realizes non-contact measurement of the sample to be measured through the relevant unit components, avoiding the problem of low detection accuracy of the standard ruler of conventional contact measurement when the sample to be measured has an irregular shape or the size value of a specific area in the sample needs to be measured. In addition, the measurement operation of the above-mentioned length measuring device is relatively simple, and there is no need to additionally configure the closed detection space required for measurement using a long grating device, thereby optimizing the problem of affecting measurement efficiency when using a long grating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the structure of a length measuring device provided in one embodiment of the present application;

[0020] Figure 2 for Figure 1 A partial cross-sectional structural schematic diagram of a second leveling component in the length measuring device shown;

[0021] Figure 3 for Figure 1 An enlarged structural schematic diagram of a horizontal adjustment component in the length measuring device shown;

[0022] Figure 4 for Figure 1 A schematic diagram of a partial cross-sectional structure of a horizontal adjustment component in the length measuring device shown;

[0023] Figure 5 for Figure 1 A schematic diagram of the structure of the limiting cooperation relationship between the linear moving unit and the triangular guide rail in the length measuring device shown;

[0024] Figure 6 A schematic diagram of the structure of a lengthened support platform provided in one embodiment of the present application.

[0025] In the figure: 10, length measuring device; 100, measuring support platform; 110, triangular guide rail; 120, receiving groove; 200, laser distance measuring unit; 210, distance measuring body; 220, support bracket; 230, support bottom plate; 231, second adjustment slot; 240, fixed wing plate; 241, first adjustment slot; 250, horizontal adjustment component; 251, third bolt; 252, locking nut; 253, second gasket; 254, third gasket; 300, linear moving unit; 310, moving platform; 320, moving wheel body; 321, guide ring groove; 330, driving motor; 400, laser receiving target; 500, optical positioning unit Element; 510, camera bracket; 520, alignment camera; 610, first leveling assembly; 611, first bolt; 612, first support leg; 620, first spirit level; 630, second leveling assembly; 631, second bolt; 632, preload spring; 633, limit spring; 634, first gasket; 640, second spirit level; 650, third leveling assembly; 651, fourth bolt; 652, second support leg; 660, third spirit level; 700, extend support platform; 710, extend guide rail; 720, extend groove; 810, first fastener; 820, second fastener; 910, sample positioning card plate; 920, platform limit card plate. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] See also Figure 1 Now, some embodiments of the present application provide a length measuring device 10 for description. The length measuring device 10 includes a measuring support platform 100, a laser distance measuring unit 200, a linear moving unit 300, a laser receiving target 400 and an optical positioning unit 500, wherein the laser distance measuring unit 200 is fixedly arranged on the measuring support platform 100, the linear moving unit 300 is movably arranged on the measuring support platform 100 along a linear direction, and the laser receiving target 400 and the optical positioning unit 500 are both arranged on the linear moving unit 300. Specifically, the linear moving unit 300 is used to synchronously move the laser receiving target 400 and the optical positioning unit 500 along a linear direction, the laser ranging unit 200 is used to project a ranging laser toward the center of the laser receiving target 400 along the linear displacement direction of the linear moving unit 300, and then obtain the relative distance between the laser ranging unit 200 and the laser receiving target 400, and the optical positioning unit 500 is used to optically locate the measurement initial point and the measurement end point of the sample to be measured (not shown in the figure) placed on the measurement support platform 100.

[0031] The beneficial effect of the length measuring device 10 provided in the present application is that, compared with the prior art, when the length measuring device 10 measures the length dimension of the sample to be measured, the sample to be measured can be directly placed on the measuring support platform 100, and then the laser receiving target 400 and the optical positioning unit 500 are synchronously moved by the linear moving unit 300 until the optical positioning unit 500 optically positions the sample to be measured at the initial measuring point, and the first ranging value of the laser ranging unit 200 is recorded, and then the laser receiving target 400 and the optical positioning unit 500 are synchronously moved along the linear direction by the linear moving unit 300 until the optical positioning unit 500 optically positions the sample to be measured at the final measuring point, and the first ranging value of the laser ranging unit 200 is recorded. By recording the second distance measurement value of the laser ranging unit 200 and calculating the difference between the first distance measurement value and the second distance measurement value, the corresponding length dimension of the sample to be measured can be obtained. It can be seen that the above-mentioned length measuring device 10 realizes non-contact measurement of the sample to be measured through the cooperation of relevant unit components, avoiding the problem of low detection accuracy of the standard ruler of conventional contact measurement when the sample to be measured has an irregular shape or the size value of a specific area in the sample needs to be measured. In addition, the measurement operation of the above-mentioned length measuring device 10 is relatively simple, and there is no need to additionally configure the closed detection space required for measurement using a long grating device, thereby optimizing the problem of affecting measurement efficiency when using a long grating device.

[0032] Furthermore, in the present embodiment, the length measuring device 10 further includes a first level 620, a second level 640, a plurality of first leveling components 610 and a plurality of second leveling components 630, wherein the first level 620 and the plurality of first leveling components 610 are both arranged on the measuring support platform 100 for cooperating in adjusting the level of the measuring support platform 100, so that the sample to be measured can be placed on the measuring support platform 100 in a horizontal direction, and the linear moving unit 300 can be linearly movable in a horizontal direction on the measuring support platform 100, and the second level 640 and the plurality of second leveling components 630 are both arranged on the laser ranging unit 200 for cooperating in adjusting the level of the laser ranging unit 200, so that the laser ranging unit 200 can project a ranging laser to the bull's eye of the laser receiving target 400 in a horizontal direction, thereby improving the measurement accuracy of the sample to be measured.

[0033] Specifically, in the present embodiment, the above-mentioned multiple first leveling components 610 are respectively arranged at the four corners of the bottom of the measurement support platform 100, and the first leveling component 610 includes a first bolt 611 and a first support leg 612, wherein the first bolt 611 is threadedly connected to the bottom of the measurement support platform 100 in the vertical direction, and the first support leg 612 is fixedly arranged at one end of the first bolt 611 facing away from the measurement support platform 100 (i.e., the head of the first bolt 611), and the first spirit level 620 is arranged on the top of the measurement support platform 100; it can be understood that by adjusting the first bolts 611 of each first leveling component 610 in the vertical direction, the horizontality and height of the measurement support platform 100 can be adjusted, and the first bolts 611 cooperate with the corresponding first support legs 612 to achieve stable support for the measurement support platform 100.

[0034] Please also read Figure 1 and Figure 2 In this embodiment, the second leveling assembly 630 includes a second bolt 631, a pre-tightening spring 632 and a limit spring 633. The laser ranging unit 200 includes a ranging body 210, a support bracket 220 and a support base plate 230. The support bracket 220 is arranged on the top of the measurement support platform 100. The second bolt 631 is penetrated through the support base plate 230 and is threadedly connected to the top of the support bracket 220 in the vertical direction. The pre-tightening spring 632 is ringed on the second bolt 631 and elastically abuts against one end of the second bolt 631 facing away from the support bracket 220 (i.e., the head of the second bolt 631) and the support base plate 230 facing the support bracket 220 in the vertical direction. On one side of the head of the second bolt 631, a limit spring 633 is ringed on the second bolt 631 and is limited in the vertical direction to abut against the side of the support base plate 230 that is opposite to the head of the second bolt 631, and a connecting thread (not shown in the figure) provided by the second bolt 631 is located on the side of the support base plate 230 that is opposite to the head of the second bolt 631, and a second spirit level 640 is arranged on the top of the support base plate 230. It can be understood that each limit spring 633 in each second leveling component 630 is used to cooperate with the support base plate 230, and the horizontality and height of the support base plate 230 can be supported by adjusting each second bolt 631 of each second leveling component 630 in the vertical direction.

[0035] More specifically, in this embodiment, the above-mentioned second leveling assembly 630 also includes a first gasket 634, which is arranged on the second bolt 631 and is located between the pre-tensioning spring 632 and the head of the second bolt 631, that is, the pre-tensioning spring 632 elastically abuts against the side of the first gasket 634 facing away from the second bolt 631 and the side of the support base plate 230 facing the head of the second bolt 631 along the vertical direction.

[0036] See also Figure 3In this embodiment, the laser ranging unit 200 further includes a fixed wing plate 240 and a plurality of horizontal adjustment components 250, wherein the ranging body 210 is disposed on the fixed wing plate 240, and each horizontal adjustment component 250 is respectively connected to the fixed wing plate 240 and the supporting base plate 230, so as to lock or unlock the position of the ranging body 210 relative to the supporting base plate 230 in the horizontal direction; it should be noted that when the position of the ranging body 210 relative to the supporting base plate 230 is unlocked in the horizontal direction, the operator can adjust (such as horizontally rotate or move) the ranging body 210 in the horizontal direction, so that the ranging laser emitted by the ranging body 210 can be accurately projected at the bull's eye of the laser receiving target 400, that is, the ranging laser projected by the ranging body 210 is preferably parallel to the linear displacement direction of the linear moving unit 300, thereby improving the measurement accuracy of the sample to be measured.

[0037] See also Figure 4 In this embodiment, the horizontal adjustment assembly 250 includes a third bolt 251 and a locking nut 252, and the fixed wing plate 240 is provided with a plurality of first adjustment slots 241, and the support base plate 230 is provided with second adjustment slots 231 that are connected to the first adjustment slots 241 in a one-to-one correspondence along the vertical direction, wherein the third bolts 251 are passed through the corresponding first adjustment slots 241, the corresponding second adjustment slots 231 and the corresponding locking nuts 252 in a one-to-one correspondence, and the minimum gap of the first adjustment slots 241 and the minimum gap of the second adjustment slots 231 are greater than the diameter of the rod of the third bolt 251; it should be noted that when the locking nut 252 abuts against the support When the supporting base plate 230 is facing away from the side of the fixed wing plate 240, the fixed wing plate 240 and the supporting base plate 230 are in close contact and fixed, thereby locking the position of the ranging body 210 relative to the supporting base plate 230 in the horizontal direction. When the locking nut 252 is separated from the side of the supporting base plate 230 facing away from the fixed wing plate 240, the fixed wing plate 240 and the supporting base plate 230 are relatively loosened, thereby unlocking the position of the ranging body 210 relative to the supporting base plate 230 in the horizontal direction, and then adjusting the position of the ranging body 210 in the horizontal direction, so that the ranging laser emitted by the ranging body 210 can be accurately projected at the bull's eye of the laser receiving target 400.

[0038] More specifically, in this embodiment, the above-mentioned horizontal adjustment assembly 250 also includes a second gasket 253 and a third gasket 254, wherein the second gasket 253 is arranged on the third bolt 251 and is located between the fixed wing plate 240 and the head of the third bolt 251, and the third gasket 254 is arranged on the third bolt 251 and is located between the support base plate 230 and the locking nut 252.

[0039] Please also read Figure 1 and Figure 5In the present embodiment, a plurality of triangular guide rails 110 are arranged in parallel pairs on the top of the measurement support platform 100. The linear moving unit 300 includes a moving platform 310, a plurality of moving wheels 320 arranged in pairs at intervals at the bottom of the moving platform 310, and a driving motor 330 arranged on the top of the moving platform 310 for driving each moving wheel 320 to rotate, wherein each moving wheel 320 is provided with a guide ring groove 321 adapted to the top contour of the triangular guide rail 110 to form a limiting fit with the triangular guide rail 110 (the cross-sectional contour of the triangular guide rail 110 and the cross-sectional contour of the guide ring groove 321 are respectively adapted triangles), and the laser receiving target 400 and the optical positioning unit 500 are both fixedly arranged on the top of the moving platform 310.

[0040] Please also read Figure 1 and Figure 6 In this embodiment, the length measuring device 10 further includes a supplementary support platform 700 for connecting the extended measurement support platform 100 along the extension direction of the triangular guide rail 110, or a plurality of supplementary support platforms 700 connected in sequence, and a third level 660 and a plurality of third leveling components 650 arranged on any supplementary support platform 700 for adjusting the horizontality of the corresponding supplementary support platform 700. Supplementary guide rails 710 for correspondingly connecting and extending each triangular guide rail 110 are arranged in parallel in pairs at the top of any supplementary support platform 700, and the guide ring grooves 321 of the corresponding moving wheel bodies 320 are also adapted to the triangular contour at the top of the supplementary guide rails 710 to form a limit fit (the cross-sectional contour of the supplementary guide rail 710 and the cross-sectional contour of the guide ring groove 321 are also respectively adapted triangles).

[0041] It should be noted that, in the present embodiment, during the measurement of the sample to be measured, the number of connections of the above-mentioned lengthened support platform 700 is determined based on the corresponding measurement length dimension of the sample to be measured. When the corresponding measurement length dimension of the sample to be measured is smaller than the measurement range corresponding to the triangular guide rail 110, it is not necessary to connect the lengthened support platform 700; when the corresponding measurement length dimension of the sample to be measured is larger than the measurement range corresponding to the triangular guide rail 110, so that a lengthened support platform 700 needs to be connected, the lengthened support platform 700 is directly connected to one end of the measuring support platform 100 along the extension direction of the triangular guide rail 110, and the lengthened guide rails 710 on the corresponding lengthened support platform 700 are directly connected to each triangular guide rail 110 one by one. 10; When the corresponding measuring length dimension of the measured sample is larger than the measuring range corresponding to the triangular guide rail 110, so that multiple complementary support platforms 700 need to be connected, the multiple complementary support platforms 700 are connected in sequence along the extension direction of the triangular guide rail 110, and one end of a complementary support platform 700 located at the end away from the other complementary support platforms 700 is directly connected to one end of the measuring support platform 100 along the extension direction of the triangular guide rail 110, and the complementary guide rails 710 on each corresponding complementary support platform 700 are connected one by one in sequence, and one end of each complementary guide rail 710 of a complementary support platform 700 located at the end away from the other complementary guide rails 710 is directly connected to each triangular guide rail 110 one by one.

[0042] Furthermore, in the present embodiment, a plurality of receiving grooves 120 are arranged in parallel in pairs on the top of the measuring support platform 100, and each receiving groove 120 extends along its own extension direction at one end away from the laser ranging unit 200 and penetrates through one side of the measuring support platform 100, and each triangular guide rail 110 is fixedly arranged in each receiving groove 120 in a one-to-one manner, and a plurality of supplementary grooves 720 are arranged in parallel in pairs on the top of any supplementary support platform 700, and the opposite ends of each supplementary groove 720 along its own extension direction respectively penetrate through the two side sides of the supplementary support platform 700 for one-to-one corresponding connection and extension of each receiving groove 120, and each supplementary guide rail 710 of any supplementary support platform 700 is fixedly arranged in each corresponding supplementary groove 720 in a one-to-one manner.

[0043] It should be noted that, in this embodiment, when the corresponding measurement length dimension of the measured sample is greater than the corresponding measurement range of the triangular guide rail 110, so that a supplementary support platform 700 needs to be connected, the supplementary support platform 700 is directly connected to one end of the measuring support platform 100 along the extension direction of the triangular guide rail 110, and the supplementary grooves 720 on the corresponding supplementary support platform 700 are directly connected to each receiving groove 120 one by one; when the corresponding measurement length dimension of the measured sample is greater than the corresponding measurement range of the triangular guide rail 110, so that multiple supplementary support platforms need to be connected When the measuring support platform 100 is formed, multiple complementary support platforms 700 are connected in sequence along the extension direction of the triangular guide rail 110, and one end of a complementary support platform 700 located at the end away from the other complementary support platforms 700 is directly connected to one end of the measuring support platform 100 along the extension direction of the triangular guide rail 110, and the complementary grooves 720 on each corresponding complementary support platform 700 are connected in sequence one by one, and each complementary groove 720 of a complementary support platform 700 located at the end away from the other complementary grooves 720 is directly connected to each receiving groove 120 one by one.

[0044] Furthermore, in the present embodiment, a first fastener 810 and a second fastener 820 are respectively provided at opposite ends of any of the above-mentioned lengthening support platforms 700 along the extension direction of the lengthening guide rail 710, and a second fastener 820 is provided at one end of the measuring support platform 100 away from the laser ranging unit 200 along the extension direction of the triangular guide rail 110, wherein the first fastener 810 of any of the lengthening support platforms 700 is used to be fastened and connected with the second fastener 820 of the measuring support platform 100, or to be fastened and connected with the second fastener 820 of the other lengthening support platform 700.

[0045] Specifically, in this embodiment, the above-mentioned first fastener 810 includes a positioning pin shaft (not shown in the figure) arranged on the side portion of the corresponding one side of the lengthening support platform 700, the second fastener 820 includes a positioning axis hole (not shown in the figure) arranged on the side portion of the corresponding one side of the lengthening support platform 700 or the side portion of the corresponding one side of the measuring support platform 100, and a locking bolt (not shown in the figure) arranged on the corresponding other side portion of the lengthening support platform 700 or the corresponding other side portion of the measuring support platform 100, and the locking bolt is used to vertically abut and lock the corresponding positioning pin shaft extending into the corresponding positioning axis hole.

[0046] Furthermore, in the present embodiment, the above-mentioned multiple third leveling components 650 are respectively arranged at the four corners of the bottom of the complementary support platform 700, and the third leveling component 650 includes a fourth bolt 651 and a second support leg 652, wherein the fourth bolt 651 is threadedly connected to the bottom of the complementary support platform 700 in the vertical direction, the second support leg 652 is fixedly arranged at one end of the fourth bolt 651 facing away from the complementary support platform 700 (i.e., the head of the fourth bolt 651), and the third spirit level 660 is arranged on the top of the complementary support platform 700; it can be understood that by adjusting the fourth bolts 651 of each third leveling component 650 in the vertical direction, the horizontality and height of the complementary support platform 700 can be adjusted, and the fourth bolts 651 cooperate with the corresponding second support legs 652 to achieve stable support for the complementary support platform 700.

[0047] Furthermore, in the present embodiment, the length measuring device 10 further includes a sample positioning card plate 910 and a platform limiting card plate 920. The sample positioning card plate 910 is fixedly disposed on the top of the measuring support platform 100 to abut against one end of the sample to be measured, thereby assisting in fixing the sample to be measured. The platform limiting card plate 920 is detachably disposed in pairs on the triangular guide rail 110 on the top of the measuring support platform 100, or is detachably disposed in pairs on the triangular guide rail 110 on the top of the measuring support platform 100 and the corresponding extension guide rail 710 of the extension support platform 700, thereby limiting the movement range of the mobile platform 310. Further, in the present embodiment, the optical positioning unit 500 further includes a camera bracket 510 disposed on the mobile platform 310 and a positioning camera 520 disposed on the camera bracket 510.

[0048] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A length measuring device, characterized in that: It includes a measurement support platform, a laser distance measuring unit, a linear moving unit, a laser receiving target, an optical positioning unit and a sample positioning card plate, wherein the laser distance measuring unit and the sample positioning card plate are both fixedly arranged on the measurement support platform, the linear moving unit is movably arranged on the measurement support platform, and the laser receiving target and the optical positioning unit are both fixedly arranged on the linear moving unit; The linear moving unit is used to synchronously linearly move the laser receiving target and the optical positioning unit, the laser ranging unit is used to project a ranging laser toward the laser receiving target along the displacement direction of the linear moving unit, the sample fixing clamp is used to abut and position the sample to be tested, and the optical positioning unit is used to optically locate the measurement initial point and the measurement end point of the sample to be tested.

2. The length measuring device according to claim 1, characterized in that: The length measuring device also includes a first level, a second level, multiple first leveling components and multiple second leveling components. The first level and each of the first leveling components are arranged on the measurement support platform to cooperate in adjusting the level of the measurement support platform. The second level and each of the second leveling components are arranged on the laser ranging unit to cooperate in adjusting the level of the laser ranging unit.

3. The length measuring device according to claim 2, characterized in that: The first leveling assembly includes a first bolt and a first support foot arranged on the head of the first bolt, the first bolt is threadedly connected to the bottom of the measurement support platform along a vertical direction, and the first level is arranged on the top of the measurement support platform.

4. The length measuring device according to claim 2, characterized in that: The second leveling assembly includes a second bolt, a pre-tightening spring and a limiting retaining spring. The laser ranging unit includes a supporting bracket, a supporting base plate and a ranging body. The supporting bracket is arranged on the top of the measuring support platform, and the ranging body is arranged on the top of the supporting base plate. The second bolt passes through the supporting base plate and is threadedly connected to the supporting bracket in the vertical direction. The pre-tightening spring ring is arranged on the second bolt and elastically abuts against the second bolt head and the side of the supporting base plate facing the second bolt head in the vertical direction respectively. The limiting retaining spring ring is arranged on the second bolt and abuts against the side of the supporting base plate facing away from the second bolt head in the vertical direction. The second level is arranged on the top of the supporting base plate.

5. The length measuring device according to claim 4, characterized in that: The laser ranging unit also includes a fixed wing plate and a plurality of horizontal adjustment components. The ranging body is arranged on the fixed wing plate. Each of the horizontal adjustment components is respectively connected to the fixed wing plate and the supporting base plate to lock or unlock the position of the ranging body relative to the supporting base plate in the horizontal direction.

6. The length measuring device according to claim 5, characterized in that: The horizontal adjustment assembly includes a third bolt and a locking nut, the fixed wing plate is provided with a plurality of first adjustment slots, the supporting base plate is provided with a plurality of second adjustment slots corresponding to each of the first adjustment slots, the third bolts are respectively passed through the first adjustment slots, the second adjustment slots and the locking nut in sequence, and the minimum gap of the first adjustment slot and the minimum gap of the second adjustment slot are both greater than the diameter of the third bolt rod.

7. The length measuring device according to claim 1, characterized in that: A plurality of triangular guide rails are arranged in parallel in pairs on the top of the measurement support platform. The linear moving unit includes a moving platform and a plurality of moving wheels arranged in pairs at intervals on the bottom of the moving platform. Each of the moving wheels is provided with a guide ring groove adapted to the triangular contour at the top of the triangular guide rail to form a limiting fit with the corresponding triangular guide rail. The laser receiving target and the optical positioning unit are fixedly arranged on the top of the moving platform.

8. The length measuring device according to claim 7, characterized in that: The length measuring device also includes one or more sequentially connected extension support platforms for connecting and extending the measuring support platform along the extension direction of the triangular guide rail, and a third level and multiple third leveling components arranged on any of the extension support platforms for coordinating and adjusting the horizontality of the corresponding extension support platform. A plurality of sections of extension guide rails for correspondingly connecting and extending each of the triangular guide rails are arranged in parallel in pairs at the top of any of the extension support platforms, and each of the moving wheel bodies is provided with the guide ring groove adapted to the triangular contour at the top of the extension guide rail to form a limited fit with the corresponding extension guide rail.

9. The length measuring device according to claim 8, characterized in that: A plurality of receiving grooves are arranged in parallel pairs on the top of the measuring support platform, and one end of each receiving groove along its own extension direction passes through a side portion of the measuring support platform, and each triangular guide rail is fixedly arranged in each receiving groove in a one-to-one manner. A plurality of supplementary grooves are arranged in parallel pairs on the top of any supplementary support platform, and the opposite ends of each supplementary groove along its own extension direction respectively pass through the two side portions of the supplementary support platform for one-to-one connection and extension of each receiving groove, and each supplementary guide rail of any supplementary support platform is fixedly arranged in each corresponding supplementary groove in a one-to-one manner.

10. The length measuring device according to claim 9, characterized in that: Any of the aforementioned compensating support platforms is respectively provided with a first fastener and a second fastener at the opposite ends along the extension direction of the aforementioned compensating guide rail, and the corresponding end of the aforementioned measuring support platform along the extension direction of the aforementioned triangular guide rail is provided with the second fastener, and the first fastener of any of the aforementioned compensating support platforms is used for being fastened and connected with the second fastener of the aforementioned measuring support platform, or for being fastened and connected with the second fastener of other aforementioned compensating support platforms.

11. The length measuring device according to claim 10, characterized in that: The first fastener includes a positioning pin shaft arranged on the side portion of the corresponding one side of the lengthening support platform, the second fastener includes a positioning axis hole arranged on the side portion of the corresponding one side of the lengthening support platform or the side portion of the corresponding one side of the measuring support platform, and a locking bolt arranged on the side portion of the corresponding other side of the lengthening support platform or the side portion of the corresponding other side of the measuring support platform, and the locking bolt is used to vertically abut and lock the corresponding positioning pin shaft extending into the corresponding positioning axis hole.

12. The length measuring device according to claim 8, characterized in that: The third leveling assembly includes a fourth bolt and a second support leg arranged on the head of the fourth bolt, the fourth bolt is threadedly connected to the bottom of the lengthened support platform along the vertical direction, and the third level is arranged on the top of the lengthened support platform.

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