Laser height difference measuring device

Abstract

The utility model discloses a kind of laser height difference measuring devices, include support frame, include: laser unit, reference unit, drive unit and jacking unit;Drive unit and laser unit are fixed on support frame, reference unit and jacking unit are fixed on the output end of drive unit;Laser unit is set on reference unit and jacking unit above, reference unit is set on jacking unit above;To be measured product is fixed on jacking unit;Drive unit drives reference unit and jacking unit to move to laser unit below in turn;Jacking unit jacks up to be measured product to the shell top surface of to be measured product and reference unit meets;Laser unit detects the signal trigger head of to be measured product and the height value of reference unit respectively.The utility model adopts laser measurement, laser measurement belongs to non-contact measurement, does not affect the authenticity of measurement, and measurement is high in accuracy and fast in response time, thus greatly improve measurement value accuracy and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of measurement technology, and in particular to a laser height difference measuring device. Background Technology

[0002] like Figure 1 As shown, this is the main housing of a wrist scanner, i.e., the product under test 1. The distance from the signal trigger head 12 to the top surface 11 of the housing needs to be strictly controlled. If the control is not up to standard, the scanning signal will not be triggered or the spring pressure of the button 13 will be poor. Therefore, this distance h needs to be measured during the production process. In the existing technology, the measurement method used is three-dimensional measurement. Since the signal trigger head 12 is a slanted structure and is embedded in the iron spring, two problems will occur when the three-dimensional probe touches its highest point: 1. When the three-dimensional probe touches the signal trigger head, the signal trigger head will sink slightly, resulting in a larger distortion of the h value; 2. The three-dimensional probe cannot accurately touch the highest point of the signal trigger head, resulting in a larger distortion of the h value, and the measurement efficiency of the three-dimensional probe is not high. Summary of the Invention

[0003] According to an embodiment of the present invention, a laser height difference measuring device is provided, comprising a support frame, and including: a laser unit, a reference unit, a drive unit, and a lifting unit;

[0004] Both the drive unit and the laser unit are fixed on the support frame, while the reference unit and the lifting unit are fixed on the output end of the drive unit;

[0005] The laser unit is positioned above the reference unit and the lifting unit, with the reference unit positioned above the lifting unit.

[0006] The product under test is fixed on the lifting unit;

[0007] The drive unit drives the reference unit and the lifting unit to move sequentially to directly below the laser unit;

[0008] The lifting unit lifts the product under test until the top surface of the product under test is in contact with the reference unit;

[0009] The laser unit detects the height values ​​of the signal trigger head and the reference unit of the product under test, respectively.

[0010] Furthermore, the drive unit includes:

[0011] Mounting plate, the bottom of the mounting plate is slidably connected to the support frame, and the mounting plate fixes the reference unit and the lifting unit;

[0012] The drive mechanism is fixed on the support frame. The output end of the drive mechanism is connected to the lifting unit or mounting plate, driving the lifting unit and the reference unit to move directly below the laser unit.

[0013] Furthermore, the drive mechanism is a linear module.

[0014] Furthermore, the reference unit includes:

[0015] A pair of fixed plates are arranged opposite each other and parallel to each other, and are vertically fixed on the drive unit. The lifting unit is arranged between the pair of fixed plates.

[0016] A reference plate, which is fixed on top of a pair of fixed plates;

[0017] The reference block is fixed to the bottom surface of the reference plate.

[0018] The reference plate has a first opening and a second opening. The first opening is located directly above the reference block, and the second opening is located directly above the product to be tested.

[0019] The laser unit detects the height of the top surface of the reference block through the first opening, and the laser unit detects the height of the signal trigger head through the second opening.

[0020] Furthermore, the lifting unit includes: a lifting cylinder, a lifting plate, several first guide pillars, several first linear bearings, and a positioning fixture;

[0021] The lifting cylinder is fixed on the drive unit, and the output end of the lifting cylinder passes through the drive unit and is connected to the lifting plate.

[0022] The lifting plate is positioned above the drive unit;

[0023] Several first guide posts pass through the drive unit, and the several first guide posts are slidably connected to the drive unit through several first linear bearings respectively. The top ends of the several first guide posts are fixed on the lifting plate.

[0024] The positioning fixture is fixed on the lifting plate, and the positioning fixture fixes the product to be tested.

[0025] The lifting cylinder drives the lifting plate and positioning fixture to rise until the top surface of the shell of the product under test is in contact with the reference unit.

[0026] Furthermore, the lifting unit also includes: a base plate, several second guide columns, several second linear bearings, and several springs;

[0027] The base plate is set above the lifting plate, and the positioning fixture is fixed on the base plate;

[0028] Several second guide posts penetrate the lifting plate and are slidably connected to the lifting plate through several second linear bearings respectively. The top ends of several second guide posts are fixed on the base plate.

[0029] Several springs are arranged between the base plate and the lifting plate, with the two ends of the springs connected to the base plate and the lifting plate respectively.

[0030] Furthermore, the laser unit includes: a mounting base, a laser displacement sensor, and a fine-tuning mechanism;

[0031] The mounting base is fixed to the support frame;

[0032] The fine-tuning mechanism is mounted on the mounting base;

[0033] The laser displacement sensor is located at the output end of the fine-tuning mechanism and above the reference unit. The fine-tuning mechanism fine-tunes the position of the laser displacement sensor.

[0034] The laser displacement sensor emits a laser beam to detect the height values ​​of the trigger head and the reference unit.

[0035] Furthermore, the fine-tuning mechanism includes: a lateral adjustment block, a longitudinal adjustment block, several first screws, and several second screws;

[0036] The horizontal adjusting block has several horizontal waist-shaped holes;

[0037] Several first screws pass through several transverse oblong holes in a corresponding manner, and the transverse adjusting block is fixed to the mounting base by several first screws;

[0038] The longitudinal adjusting block has several longitudinal waist-shaped holes;

[0039] Several second screws pass through several longitudinal oblong holes in a corresponding manner, and the longitudinal adjusting block is fixed to the transverse adjusting block by several second screws;

[0040] The laser displacement sensor is fixed on the longitudinal adjustment block;

[0041] The horizontal oblong hole is used for fine-tuning the laser displacement sensor in the horizontal direction, and the vertical oblong hole is used for fine-tuning the laser displacement sensor in the vertical direction.

[0042] Furthermore, it also includes: a safety cover, which is fixed on the support frame and covers the laser unit, the reference unit, the drive unit, and the lifting unit.

[0043] Furthermore, it also includes: a control panel, which is fixed to the safety housing and is communicatively connected to the laser unit, drive unit, and lifting unit.

[0044] The laser height difference measuring device according to the present invention uses laser measurement. Laser measurement is a non-contact measurement, which does not affect the authenticity of the measurement. In addition, the measurement has high accuracy and fast response time, thus greatly improving the accuracy and efficiency of the measurement value.

[0045] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of the product to be tested;

[0047] Figure 2 This is a cross-sectional view of the signal trigger head of the product under test;

[0048] Figure 3 This is a schematic diagram of the structure of the laser height difference measuring device according to an embodiment of the present invention;

[0049] Figure 4 for Figure 3 Internal diagram;

[0050] Figure 5 This is a schematic diagram of the reference unit of the laser height difference measuring device according to an embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of the lifting unit of the laser height difference measuring device according to an embodiment of the present invention;

[0052] Figure 7 This is a schematic diagram of the laser unit of the laser height difference measuring device according to an embodiment of the present invention.

[0053] Reference numerals: Product 1, Top surface of shell 11, Signal trigger head 12, Button 13;

[0054] 2. Support frame; 3. Safety cover; 4. Control panel;

[0055] Drive unit 5, mounting plate 51, drive mechanism 52, linear guide rail 53, slider 54;

[0056] Reference unit 6, fixing plate 61, reference plate 62, reference block 63, first opening 64, second opening 65;

[0057] Lifting unit 7, lifting cylinder 71, lifting plate 72, first guide post 73, first linear bearing 74, positioning fixture 75, base plate 76, second guide post 77, second linear bearing 78, spring 79;

[0058] Laser unit 8, mounting base 81, laser displacement sensor 82, lateral adjustment block 83, longitudinal adjustment block 84, lateral oblong hole 85, longitudinal oblong hole 86. Detailed Implementation

[0059] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0060] First, combine Figures 1-7 The laser height difference measuring device according to the embodiments of the present invention is used to detect whether a product is qualified, and its application scenarios are very wide.

[0061] like Figures 1-7 As shown, the laser height difference measuring device of this utility model embodiment includes a support frame 2, which includes a laser unit 8, a reference unit 6, a drive unit 5, and a lifting unit 7.

[0062] Specifically, such as Figures 3-7 As shown, in this embodiment, the driving unit 5 and the laser unit 8 are both fixed on the support frame 2, and the reference unit 6 and the lifting unit 7 are fixed on the output end of the driving unit 5; the laser unit 8 is set above the reference unit 6 and the lifting unit 7, and the reference unit 6 is set above the lifting unit 7; the product under test 1 is fixed on the lifting unit 7; the lifting unit 7 lifts the product under test 1 until the top surface 11 of the shell of the product under test 1 is connected to the reference unit 6, so that the height value of the reference unit 6 is consistent with the height value of the top surface 11 of the shell of the product under test 1. When it is inconvenient to directly detect the height value of the top surface 11, the height value of the top surface 11 can be obtained by detecting the height value of the reference unit 6, thereby obtaining the height difference h between the top surface 11 and the signal trigger head 12; the driving unit 5 drives the reference unit 6 and the lifting unit 7 to move sequentially to directly below the laser unit 8, and the laser unit 8 detects the height values ​​of the signal trigger head 12 and the reference unit 6 of the product under test 1 respectively. Using the above device to replace three-dimensional measurement, the non-contact measurement via laser does not affect the accuracy of the measurement, and has high measurement precision and fast response speed, greatly improving the accuracy and efficiency of the measurement values.

[0063] Specifically, such as Figures 3-4 As shown, in this embodiment, the drive unit 5 includes: a mounting plate 51, the bottom of which is slidably connected to the support frame 2, the mounting plate 51 fixing the reference unit 6 and the lifting unit 7. In this embodiment, the mounting plate 51 is slidably connected to the support frame 2 via a linear guide rail 53 and a slider 54; and a drive mechanism 52, which is fixed on the support frame 2. The output end of the drive mechanism 52 is connected to the lifting unit 7 or the mounting plate 51, driving the lifting unit 7 and the reference unit 6 to move directly below the laser unit 8. In this embodiment, the drive mechanism 52 is a linear module, but a linear drive mechanism 52 with the same function, such as a cylinder or an electric cylinder, can also be used.

[0064] Specifically, such as Figures 4-5As shown, in this embodiment, the reference unit 6 includes: a pair of fixing plates 61, which are arranged opposite to each other and parallel to each other, and are vertically fixed on the drive unit 5; a lifting unit 7 is disposed between the pair of fixing plates 61; a reference plate 62, which is fixed to the top of the pair of fixing plates 61; and a reference block 63, which is fixed to the bottom surface of the reference plate 62. The reference plate 62 is in contact with the top surface 11 of the shell of the product under test 1, limiting the lifting height of the product under test 1 and providing an installation reference for the reference block 63. The lower surface of the reference block 63, the upper surface of the reference block 63, and the top surface 11 of the shell of the product under test 1 are coplanar. The height of the top surface 11 can be obtained by detecting the height of the upper surface of the reference block 63. The reference plate 62 has a first opening 64 and a second opening 65. The first opening 64 is located directly above the reference block 63, and the second opening 65 is located directly above the product under test 1. The laser unit 8 detects the height of the top surface of the reference block 63 through the first opening 64, and the laser unit 8 detects the height of the signal trigger head 12 through the second opening 65.

[0065] Specifically, such as Figure 4 and 6 As shown, in this embodiment, the lifting unit 7 includes: a lifting cylinder 71, a lifting plate 72, a plurality of first guide pillars 73, a plurality of first linear bearings 74, and a positioning fixture 75; the lifting cylinder 71 is fixed on the drive unit 5, and the output end of the lifting cylinder 71 passes through the drive unit 5 and is connected to the lifting plate 72; the lifting plate 72 is disposed above the drive unit 5; the plurality of first guide pillars 73 pass through the drive unit 5, and the plurality of first guide pillars 73 are slidably connected to the drive unit 5 through the plurality of first linear bearings 74 respectively, and the top ends of the plurality of first guide pillars 73 are fixed on the lifting plate 72, and the plurality of first guide pillars 73 provide guidance for the vertical movement of the lifting plate 72; the positioning fixture 75 is fixed on the lifting plate 72, and the positioning fixture 75 fixes the product to be tested 1; the lifting cylinder 71 drives the lifting plate 72 and the positioning fixture 75 to rise until the top surface 11 of the shell of the product to be tested 1 is connected to the reference unit 6.

[0066] Furthermore, such as Figure 4 and 6 As shown, in this embodiment, the lifting unit 7 further includes: a base plate 76, a plurality of second guide posts 77, a plurality of second linear bearings 78, and a plurality of springs 79; the base plate 76 is disposed above the lifting plate 72, and the positioning fixture 75 is fixed on the base plate 76; the plurality of second guide posts 77 penetrate the lifting plate 72 and are slidably connected to the lifting plate 72 through the plurality of second linear bearings 78 respectively, and the top ends of the plurality of second guide posts 77 are fixed on the base plate 76; the plurality of springs 79 are disposed between the base plate 76 and the lifting plate 72, and the two ends of the plurality of springs 79 are respectively connected to the base plate 76 and the lifting plate 72, so that the product to be tested 1 can be pressed more stably onto the lower surface of the reference plate 62 through the springs 79.

[0067] Specifically, such as Figure 4 and 7 As shown, in this embodiment, the laser unit 8 includes: a mounting base 81, a laser displacement sensor 82, and a fine-tuning mechanism. The mounting base 81 is fixed on the support frame 2, providing mounting support for the laser. The fine-tuning mechanism is disposed on the mounting base 81. The laser displacement sensor 82 is disposed at the output end of the fine-tuning mechanism and above the reference unit 6. The fine-tuning mechanism fine-tunes the position of the laser displacement sensor 82. The laser displacement sensor 82 emits a laser beam to detect the height values ​​of the trigger head 12 and the reference unit 6. Non-contact measurement is achieved through the laser displacement sensor 82, resulting in high measurement accuracy and fast response speed. In this embodiment, the laser beam diameter is 0.05 mm, the test range is 25~35 mm, and the accuracy is 10 μm.

[0068] Furthermore, such as Figure 4 and 7 As shown, in this embodiment, the fine-tuning mechanism includes: a horizontal adjusting block 83, a vertical adjusting block 84, a plurality of first screws, and a plurality of second screws; the horizontal adjusting block 83 has a plurality of horizontal oblong holes 85; the plurality of first screws pass through the plurality of horizontal oblong holes 85 in a corresponding manner, and the horizontal adjusting block 83 is fixed to the mounting base 81 by the plurality of first screws; the vertical adjusting block 84 has a plurality of vertical oblong holes 86; the plurality of second screws pass through the plurality of vertical oblong holes 86 in a corresponding manner, and the vertical adjusting block 84 is fixed to the horizontal adjusting block 83 by the plurality of second screws; the laser displacement sensor 82 is fixed to the vertical adjusting block 84; the horizontal oblong holes 85 are used for fine-tuning the laser displacement sensor 82 in the horizontal direction, and the vertical oblong holes 86 are used for fine-tuning the laser displacement sensor 82 in the vertical direction. By slightly loosening the first screw, the lateral adjustment block 83 is slightly disengaged from the mounting base 81. Then, the lateral adjustment block is moved along the length of the lateral oblong hole 85 to achieve lateral fine-tuning of the laser displacement sensor 82. By slightly loosening the second screw, the longitudinal adjustment block 84 is slightly disengaged from the lateral adjustment block 83. Then, the longitudinal adjustment block 84 is moved along the length of the longitudinal oblong hole 86 to achieve longitudinal fine-tuning of the laser displacement sensor 82, thereby improving the applicability of the laser displacement sensor 82.

[0069] In this embodiment, there are four transverse waist-shaped holes 85, which are respectively set at the four corners of the transverse adjusting block 83, and two longitudinal waist-shaped holes 86, which are respectively set on both sides of the longitudinal adjusting block 84. The driving direction of the driving unit 5 is X-axis, the moving direction of the transverse adjusting block 83 is Y-axis, and the moving direction of the longitudinal adjusting block 84 is Z-axis. The X-axis, Y-axis and Z-axis are perpendicular to each other.

[0070] Specifically, such as Figure 3As shown, in this embodiment, it also includes: a safety cover 3, which is fixed on the support frame 2 and covers the laser unit 8, the reference unit 6, the drive unit 5 and the lifting unit 7 to provide safety protection.

[0071] Furthermore, such as Figure 3 As shown, in this embodiment, it also includes: a control panel 4, which is fixed on the safety cover 3. The control panel 4 is communicatively connected to the laser unit 8, the drive unit 5 and the lifting unit 7. The control panel 4 adopts the existing type, and the user can control the start and stop of the device through the control panel 4. The detection results of the laser unit 8 will also be fed back to the control panel 4 for display.

[0072] The workflow is as follows: The worker places the product to be tested 1 into the positioning fixture 75, and the lifting unit 7 lifts the positioning fixture 75 until the top surface 11 of the shell of the product to be tested 1 is in contact with the reference plate 62; the driving unit 5 drives the reference block 63 to move directly below the laser beam, and the laser displacement sensor 82 collects the height value a of the upper surface of the reference block 63; the driving unit 5 then drives the product to be tested 1 to move slowly below the laser beam, and the laser displacement sensor 82 continuously collects multiple height values ​​of the signal trigger head 12 and feeds them back to the external system. The external system filters out the maximum value bmax, calculates the difference between bmax and a and feeds it back to the control panel 4 for display, the device is reset as a whole, and then the worker takes away the product to be tested 1.

[0073] Detection principle: such as Figure 2 As shown, the laser beam first detects the height value a of the top surface 11 of the shell (by detecting the upper surface of the reference block 63). The laser beam then continuously detects the height value of the signal trigger head 12 for values ​​b1, b2, ..., bn-1. The laser continuously collects data at intervals of 0.2 mm until the data bn suddenly increases. The system records the data of b1, b2, ..., bn-1 and filters out the maximum value bmax. Then, the difference between a and bmax is calculated to obtain the true height difference h.

[0074] Above, refer to Figures 1-7 The present invention describes a laser height difference measuring device according to an embodiment of the present invention. Laser measurement is a non-contact measurement method, which does not affect the accuracy of the measurement. Furthermore, the measurement is highly accurate and has a fast response time, thus greatly improving the accuracy and efficiency of the measurement value.

[0075] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes that element.

[0076] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A laser height difference measuring device, comprising a support frame, characterized in that, Includes: laser unit, reference unit, drive unit, and lifting unit; Both the drive unit and the laser unit are fixed on the support frame, and the reference unit and the lifting unit are fixed on the output end of the drive unit; The laser unit is disposed above the reference unit and the lifting unit, and the reference unit is disposed above the lifting unit; The product to be tested is fixed on the lifting unit; The driving unit drives the reference unit and the lifting unit to move sequentially to directly below the laser unit; The lifting unit lifts the product under test until the top surface of the product under test is in contact with the reference unit; The laser unit detects the height values ​​of the signal trigger head of the product under test and the reference unit, respectively.

2. The laser height difference measuring device as described in claim 1, characterized in that, The driving unit includes: Mounting plate, the bottom of which is slidably connected to the support frame, and the mounting plate fixes the reference unit and the lifting unit; A drive mechanism is fixed on the support frame, and the output end of the drive mechanism is connected to the lifting unit or the mounting plate, driving the lifting unit and the reference unit to move directly below the laser unit.

3. The laser height difference measuring device as described in claim 2, characterized in that, The drive mechanism is a linear module.

4. The laser height difference measuring device as described in claim 1, characterized in that, The reference unit includes: A pair of fixed plates are arranged opposite to each other and parallel to each other, and are vertically fixed on the drive unit; the lifting unit is arranged between the pair of fixed plates. A reference plate, which is fixed to the top of the pair of fixed plates; A reference block, which is fixed to the bottom surface of the reference plate; The reference plate has a first opening and a second opening, with the first opening located directly above the reference block and the second opening located directly above the product to be tested. The laser unit detects the height value of the top surface of the reference block through the first opening, and the laser unit detects the height value of the signal trigger head through the second opening.

5. The laser height difference measuring device as described in claim 1, characterized in that, The lifting unit includes: a lifting cylinder, a lifting plate, a plurality of first guide columns, a plurality of first linear bearings, and a positioning fixture; The lifting cylinder is fixed on the drive unit, and the output end of the lifting cylinder passes through the drive unit and is connected to the lifting plate. The lifting plate is positioned above the drive unit; The plurality of first guide posts pass through the drive unit, and the plurality of first guide posts are slidably connected to the drive unit through the plurality of first linear bearings, and the top ends of the plurality of first guide posts are fixed to the lifting plate; The positioning fixture is fixed to the lifting plate, and the positioning fixture fixes the product to be tested; The lifting cylinder drives the lifting plate and the positioning fixture to rise until the top surface of the shell of the product to be tested is in contact with the reference unit.

6. The laser height difference measuring device as described in claim 5, characterized in that, The lifting unit also includes: a base plate, several second guide columns, several second linear bearings, and several springs; The base plate is positioned above the lifting plate, and the positioning fixture is fixed to the base plate; The plurality of second guide posts penetrate the lifting plate and are slidably connected to the lifting plate by the plurality of second linear bearings respectively, and the top ends of the plurality of second guide posts are fixed on the base plate; The plurality of springs are disposed between the base plate and the lifting plate, and the two ends of the plurality of springs are respectively connected to the base plate and the lifting plate.

7. The laser height difference measuring device as described in claim 1, characterized in that, The laser unit includes: a mounting base, a laser displacement sensor, and a fine-tuning mechanism; The mounting base is fixed on the support frame; The fine-tuning mechanism is mounted on the mounting base; The laser displacement sensor is disposed at the output end of the fine-tuning mechanism and above the reference unit, and the fine-tuning mechanism fine-tunes the position of the laser displacement sensor. The laser displacement sensor emits a laser beam to detect the height values ​​of the signal trigger head and the reference unit.

8. The laser height difference measuring device as described in claim 7, characterized in that, The fine-tuning mechanism includes: a lateral adjustment block, a longitudinal adjustment block, a plurality of first screws, and a plurality of second screws; The lateral adjustment block is provided with several lateral waist-shaped holes; The plurality of first screws pass through the plurality of transverse oblong holes in a corresponding manner, and the transverse adjusting block is fixed on the mounting base by the plurality of first screws; The longitudinal adjusting block has several longitudinal waist-shaped holes; The plurality of second screws pass through the plurality of longitudinal oblong holes in a corresponding manner, and the longitudinal adjusting block is fixed to the transverse adjusting block by the plurality of second screws; The laser displacement sensor is fixed on the longitudinal adjustment block; The horizontal waist-shaped hole is used for fine-tuning the laser displacement sensor in the horizontal direction, and the vertical waist-shaped hole is used for fine-tuning the laser displacement sensor in the vertical direction.

9. The laser height difference measuring device as described in claim 1, characterized in that, It also includes: a safety cover, which is fixed on the support frame and covers the laser unit, the reference unit, the drive unit and the lifting unit.

10. The laser height difference measuring device as described in claim 9, characterized in that, It also includes: a control panel, which is fixed to the safety cover and is communicatively connected to the laser unit, the drive unit and the lifting unit.

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