A relative size detection mechanism

Abstract

The present invention relates to the field of dimension detection technology, and proposes a relative dimension detection mechanism, comprising a column, a slider assembly being slidably mounted on the upper end of the column, the slider assembly comprising a detection head slider and a reference slider, a mounting slot being provided in the middle of the detection head slider, a detection assembly being arranged and mounted inside the detection head slider, a displacement sensor being connected to one side of the slider assembly, a sensor and a driving cylinder being connected to the other side of the slider assembly, a base being fixedly mounted on the bottom of the column, and a fixing mechanism being slidably mounted in the middle of the base. Relative displacement measurement is achieved by extending the driving cylinder to drive the slider assembly to move together, realizing a split sliding design, and the final detection dimension can be obtained by directly subtracting the displacement value from the calibration value of the probe head. The actual numerical measurement required for the face-to-face measurement of the product can be measured in one action, and the mechanism is compact in design and can be directly installed and used in most situations.

Description

Technical Field

[0001] The present invention relates to the technical field of size detection, and in particular to a relative size detection mechanism. Background Art

[0002] Height detection mechanisms on the market generally only detect absolute position and are unable to directly measure relative values ​​from surface to surface. Absolute position detection requires conversion to determine relative position, and data accuracy is easily affected by external tolerances. Alternatively, to achieve relative position detection, complex mechanisms must be installed, making them unsuitable for most applications. Our highly integrated mechanism measures the actual surface-to-surface value required by a product in a single operation. Its compact design allows for direct installation in most applications.

[0003] The detection head is cylindrical, and the detection object is a tube. During the detection, it is necessary to ensure that the detection head and the detection object are aligned in the axial direction, so that the detection head can be quickly inserted into the detection object to improve the detection accuracy. At the same time, the detection object needs to be limited and fixed to avoid tilting, offset and misalignment of the detection object during detection, which affects the accuracy of product detection.

[0004] Therefore, we make improvements to this and propose a relative size detection mechanism. Summary of the Invention

[0005] The object of the present invention is to provide a relative size detection mechanism to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention provides a relative size detection mechanism, including a column, a slider assembly is slidably installed on the upper end of the column, and the slider assembly includes a detection head slider and a reference slider. Relative displacement measurement is realized through a split sliding design. The detection head slider fixes the detection head, and the reference slider fixes the reference block. The independent movement of the two can accurately capture the changes in the spacing between the surfaces to be measured. The front ends of the detection head slider and the reference slider are connected with a tension spring, which connects the two sliders to provide initial linkage tension to ensure that the two move downward synchronously when the cylinder is driven. When the reference slider is blocked, the spring stretches to produce a displacement difference, and this displacement difference directly corresponds to the measured size, realizing "mechanical differential measurement". An installation groove is provided in the middle of the detection head slider, and a detection assembly is arranged and installed inside the detection head slider. A displacement sensor is connected to one side of the slider assembly, and an induction probe and a driving cylinder are connected to the other side of the slider assembly. A base is fixedly installed at the bottom of the column, and a fixing mechanism is slidably installed in the middle of the base.

[0007] As a further solution of the present invention, the detection head slider and the reference slider are both slidably connected to the column. The column serves as the core support frame of the mechanism, providing a high-rigidity guide rail to ensure that the slider assembly slides precisely along the axial direction, eliminating the deflection error during the detection process. Its vertical installation characteristics make the detection force direction consistent with the gravity direction, avoiding lateral force interference with measurement accuracy.

[0008] As a further solution of the present invention, the displacement sensor includes a connecting block and a detection block. The connecting block is fixedly installed on one side of the detection head slider, and the detection block is fixedly installed on one side of the reference slider. The upper end of the connecting block is fixedly connected to the sensor body, and a sensing probe is connected between the connecting block and the detection block. The connecting block and the detection block are respectively fixedly connected to the two sliders. The sensing probe detects the displacement difference between the two in real time and directly outputs the relative value of the surface spacing, avoiding the system error caused by column deformation and installation tolerance in traditional absolute position measurement.

[0009] As a further solution of the present invention, the detection assembly includes a detection head, a reference block and a detection tube. The detection head and the reference block adopt a stepped shaft design. The detection head contacts the detection surface first, and the reference block contacts the reference surface later, forming a "time difference triggered displacement measurement" to avoid interference caused by synchronous contact. The upper end of the detection head is fixedly mounted on the detection head slider, and the lower section of the detection head is slidably sleeved in the middle of the reference slider. The reference block is fixedly mounted on the bottom end of the reference slider, and the detection tube is sleeved on the outside of the reference block. The upper end of the detection tube penetrates the detection head slider and the reference slider and is installed in the installation groove. The elastic mounting structure of the integrated detection tube and the preload force of the compression spring are adjustable to meet the contact requirements of workpieces of different heights.

[0010] As a further solution of the present invention, a connecting ring is fixedly installed on the upper end of the detection tube, and compression springs are connected on both sides of the connecting ring. The compression springs provide adaptive clamping force to suppress the vibration of the workpiece. The elastic floating design of the connecting ring and the compression spring compensates for the height tolerance of the workpiece to prevent overload damage to the sensor. The bottom end of the detection tube is fixedly connected with a bent foot, and the bent foot at the bottom of the tube wraps the top of the workpiece to force centering and ensure that the detection head is coaxial with the inner hole of the workpiece.

[0011] As a further solution of the present invention, the base includes a parts box, and a slide is provided on the bottom surface of the parts box. The slide is integrated with the parts box to achieve precise sliding positioning of the fixing mechanism and shorten the workpiece replacement cycle.

[0012] As a further solution of the present invention, the fixing mechanism includes a fixing frame, a mounting block is installed at the bottom of the fixing frame, the mounting block is slidably installed in the slide, an electric cylinder is connected between the fixing frame and the rear wall of the parts box, a circular groove is opened in the middle of the fixing frame, and a plurality of clamping components are installed in the internal array of the circular groove, the electric cylinder: drives the fixing frame to move along the slide, so that the workpiece is automatically aligned with the detection axis, the tension spring links the first / second connecting frame, drives the roller to radially retract, and adapts to workpieces of different diameters, zero point positioning: the bottom surface of the roller is coplanar with the bottom surface of the workpiece, and a detection reference plane is established, dynamic stability: the connecting rod mechanism guided by the slide provides damping during clamping to suppress the shaking of the workpiece.

[0013] As a further solution of the present invention, the clamping assembly includes a vertical plate, a sliding groove is opened on the inner side surface of the vertical plate, a first connecting frame is fixedly installed on the upper end of the sliding groove, and a second connecting frame is slidably installed below the sliding groove. The first connecting frame and the second connecting frame are both connected to connecting rods, and are connected to rollers through the connecting rods. A tension spring is connected between the first connecting frame and the second connecting frame.

[0014] As a further solution of the present invention, the middle clamp of the fixing mechanism is equipped with a detection object, which is a tubular body with steps inside. The detection object includes a reference surface and a detection surface, and the detection size of the detection object is the distance between the reference surface and the detection surface.

[0015] The relative size detection mechanism provided by the present invention has the following beneficial effects:

[0016] 1. By driving the cylinder to extend and move the slider assembly together, the detection head is first in position to contact the detection surface, and the reference slider continues to move the reference block in position to contact the reference surface. The relative position of the detection head slider and the reference slider is pulled apart, and the displacement value between the detection block and the connecting block is read through the sensor body. The final detection size can be obtained by directly subtracting the displacement value from the calibration value of the detection head. The actual numerical measurement required for the product from the surface to the surface can be measured in one action. The mechanism is compact and can be directly installed and used in most occasions.

[0017] 2. A detection tube is sleeved on the outside of the reference block, and the total height of the product parts is detected through the detection tube. During the product inspection process, the detection tube is first clamped on the outside of the product, and the product is positioned while the overall height is detected. The detection tube and detection head are aligned with the product to improve the accuracy of the reference block when it penetrates into the product.

[0018] 3. By installing a base and a fixing mechanism at the bottom of the column, the fixing mechanism is slidably installed in the middle of the base through an electric cylinder drive, so that the product clamped and fixed in the middle of the fixing mechanism remains coaxial with the detection component after loading, which facilitates rapid and accurate detection of the product. In addition, multiple groups of clamping components are set inside the fixing frame, which are clamped and fixed at the bottom of the product using the clamping components, so that the product is placed vertically and stably on the fixing mechanism, which facilitates improving the accuracy of product detection. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 1 A schematic structural diagram of a relative size detection mechanism provided in this application;

[0021] Figure 2 A schematic diagram of the displacement sensor structure of a relative size detection mechanism provided in this application;

[0022] Figure 3 A schematic structural diagram of a slider assembly of a relative size detection mechanism provided in this application;

[0023] Figure 4 A schematic diagram of the installation of a slider assembly and a detection assembly of a relative size detection mechanism provided in this application;

[0024] Figure 5 A schematic diagram of the detection tube structure of a relative size detection mechanism provided in this application;

[0025] Figure 6 A schematic diagram of the base structure of a relative size detection mechanism provided in this application;

[0026] Figure 7 A schematic diagram of the fixing mechanism structure of a relative size detection mechanism provided in this application;

[0027] Figure 8 A schematic diagram of the structure of a clamping assembly of a relative size detection mechanism provided in this application;

[0028] Figure 9 A schematic diagram of a detection object of a relative size detection mechanism provided in this application.

[0029] In the figure: 1. column; 2. slider assembly; 21. detection head slider; 22. reference slider; 23. tension spring; 24. mounting slot; 3. displacement sensor; 31. sensor body; 32. connecting block; 33. detection block; 34. sensing probe; 4. sensing probe; 5. driving cylinder; 6. detection assembly; 61. detection head; 62. reference block; 63. detection tube; 64. connecting ring; 65. compression spring; 66. bent foot; 7. base; 71. parts box; 72. slide; 8. fixing mechanism; 81. fixing frame; 82. mounting block; 83. electric cylinder; 84. clamping assembly; 841. vertical plate; 842. slide; 843. first connecting frame; 844. second connecting frame; 845. connecting rod; 846. roller; 847. tension spring; 9. detection object; 91. reference surface; 92. detection surface. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0031] like Figures 1-9 As shown, this embodiment proposes a relative size detection mechanism, including a column 1, a slider assembly 2 is slidably installed on the upper end of the column 1, the slider assembly 2 includes a detection head slider 21 and a reference slider 22, the front ends of the detection head slider 21 and the reference slider 22 are connected with a tension spring 23, a mounting groove 24 is provided in the middle of the detection head slider 21, a detection assembly 6 is installed inside the detection head slider 21, a displacement sensor 3 is connected to one side of the slider assembly 2, and an induction probe 4 and a driving cylinder 5 are connected to the other side of the slider assembly 2, a base 7 is fixedly installed on the bottom of the column 1, and a fixing mechanism 8 is slidably installed in the middle of the base 7.

[0032] The detection head slider 21 and the reference slider 22 are both slidably connected to the column 1. The detection head slider 21 and the reference slider 22 are slidably installed on the column 1. The relative displacement value generated when the detection head slider 21 and the reference slider 22 slide is used as the value, and the value is compared with the calibration value of the detection component 6 to quickly and conveniently obtain the detection size.

[0033] The displacement sensor 3 includes a connecting block 32 and a detection block 33. The connecting block 32 is fixedly installed on one side of the detection head slider 21, and the detection block 33 is fixedly installed on one side of the reference slider 22. The upper end of the connecting block 32 is fixedly connected to the sensor body 31, and the middle of the connecting block 32 and the detection block 33 is connected to the sensing probe 34. The displacement sensor 3 detects the displacement value between the detection head slider 21 and the reference slider 22 to quickly obtain the detection size.

[0034] The detection component 6 includes a detection head 61, a reference block 62 and a detection tube 63. The upper end of the detection head 61 is fixedly mounted on the detection head slider 21, and the lower section of the detection head 61 is slidably sleeved in the middle of the reference slider 22. The reference block 62 is fixedly mounted on the bottom end of the reference slider 22. The detection tube 63 is sleeved on the outside of the reference block 62, and the upper end of the detection tube 63 penetrates the detection head slider 21 and the reference slider 22 and is installed in the installation groove 24. The detection head 61 first contacts the detection surface 92, and through the continued movement of the reference block 62 to contact the reference surface 91, the relative position of the detection head slider 21 and the reference slider 22 is pulled apart. The displacement distance between the detection head slider 21 and the reference slider 22 detected by the displacement sensor 3 and the initial value of the detection component 6 are subtracted to obtain the size between the reference surface 91 and the detection surface 92. The value is more intuitive and accurate, avoiding measurement errors.

[0035] The upper end of the detection tube 63 is fixedly installed with a connecting ring 64, and compression springs 65 are connected to both sides of the connecting ring 64. The bottom end of the detection tube 63 is fixedly connected with a bent foot 66. The detection tube 63 is installed on the outside of the reference block 62, and the bottom end extends downward beyond the bottom end of the detection head 61. The upper end is connected to the mounting groove 24 through the connecting ring 64 and the compression spring 65, so that the detection tube 63 can be extended and retracted along the axial direction of the reference block 62, and the top of the detection object 9 is wrapped by the bent foot 66 to facilitate the alignment of the detection object 9 and the detection component 6, and to support and fix the detection object 9 when the detection head 61 and the reference block 62 are detecting, so as to avoid displacement and tilt of the detection object 9 during the detection process and affect the detection accuracy. At the same time, the overall height of the detection object 9 is detected by the detection tube 63.

[0036] The base 7 includes a parts box 71 , a slide 72 is provided on the bottom surface of the parts box 71 , and the parts box 71 and the slide 72 are installed with the fixing mechanism 8 , so as to facilitate the fixing mechanism 8 to load and unload the product and position the detection object 9 .

[0037] The fixing mechanism 8 includes a fixing frame 81, a mounting block 82 is installed at the bottom of the fixing frame 81, and the mounting block 82 is slidably installed in the slide 72. An electric cylinder 83 is connected between the fixing frame 81 and the rear wall of the parts box 71. A circular groove is opened in the middle of the fixing frame 81, and a plurality of clamping components 84 are installed in the internal array of the circular groove. The fixing frame 81 is pushed and pulled and installed in the base 7 by the electric cylinder 83, and the bottom of the detection object 9 is clamped and fixed by the clamping component 84, so that the bottom surface of the detection object 9 is coplanar with the bottom surface of the clamping component 84, which is convenient for detection of the detection object 9.

[0038] The clamping assembly 84 includes a vertical plate 841, and a slide groove 842 is provided on the inner side surface of the vertical plate 841. A first connecting frame 843 is fixedly installed on the upper end of the slide groove 842, and a second connecting frame 844 is slidably installed below the slide groove 842. The first connecting frame 843 and the second connecting frame 844 are both connected with a connecting rod 845, and are connected to a roller 846 through the connecting rod 845. A tension spring 847 is connected between the first connecting frame 843 and the second connecting frame 844. The clamping assembly 84 elastically connects the first connecting frame 843 and the second connecting frame 844 through the tension spring 847, and presses the roller 846 against the surface of the detection object 9, clamping and fixing the detection object 9 to ensure the stability of the detection object 9 during detection and prevent the detection object 9 from tilting.

[0039] The fixing mechanism 8 has a detection object 9 clamped in the middle. The detection object 9 is a tubular body with steps inside. The detection object 9 includes a reference surface 91 and a detection surface 92 . The detection size of the detection object 9 is the distance between the reference surface 91 and the detection surface 92 .

[0040] Specifically, when the relative size detection mechanism is used: Step 1: All mechanisms of the mechanism are in the initial position; the final initial calibration value is 115mm (larger than the maximum detection size), and the sensor is calibrated to 0mm at this time;

[0041] Step 2: 1. The air cylinder 5 is extended, and driven by the tension spring 23, the detection head slider 21 and the reference slider 22 move together. 2. Because the initial value is larger than the detection size, the detection tube 63 also extends beyond the bottom of the detection head 61. Therefore, the detection tube 63 first contacts the detection object 9. The bent foot 66 at the bottom of the detection tube 63 accurately swallows the product into the middle of the detection tube 63. After the detection tube 63 moves a distance, the detection head 61 is in place and contacts the reference surface 91.

[0042] Step 3: 1. Due to the long drive stroke, the reference slider 22 continues to move; 2. The detection tube 63 is in place and contacts the reference surface 91, and the relative positions of the reference slider 22 and the detection head slider 21 are pulled apart;

[0043] Step 4: 1. Due to the long driving stroke, the detection head 61 will continue to move. Finally, the detection head 61 is in place and contacts the detection surface 92. The bottom of the bent foot 66 touches the bottom surface of the clamping assembly 84 (coplanar with the bottom surface of the detection object 9), and the compression spring 65 is compressed into place; 2. The spring of the driving cylinder 5 is compressed into place, and the displacement sensor 3 detects the in-place signal; 3. The PLC takes the displacement sensor value, calibration value - displacement value = final detection size, such as: 115-30.05=84.95mm. The content not described in detail in this description belongs to the existing technology known to professional and technical personnel in this field.

[0044] The above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be encompassed by the scope of the claims of the present invention.

Claims

1. A relative size detection mechanism, comprising a column (1), characterized in that: A slider assembly (2) is slidably mounted on the upper end of the column (1), and the slider assembly (2) includes a detection head slider (21) and a reference slider (22). The front ends of the detection head slider (21) and the reference slider (22) are connected to a tension spring (23). A mounting groove (24) is provided in the middle of the detection head slider (21). A detection assembly (6) is installed inside the detection head slider (21). A displacement sensor (3) is connected to one side of the slider assembly (2), and a sensing probe (4) and a driving cylinder (5) are connected to the other side of the slider assembly (2). A base (7) is fixedly mounted on the bottom of the column (1), and a fixing mechanism (8) is slidably mounted in the middle of the base (7). The detection assembly (6) ) comprises a detection head (61), a reference block (62) and a detection tube (63), the upper end of the detection head (61) is fixedly mounted on the detection head slider (21), the lower section of the detection head (61) is slidably sleeved in the middle of the reference slider (22), the reference block (62) is fixedly mounted on the bottom end of the reference slider (22), the detection tube (63) is sleeved on the outside of the reference block (62), and the upper end of the detection tube (63) penetrates the detection head slider (21) and the reference slider (22) and is mounted in the mounting groove (24); the upper end of the detection tube (63) is fixedly mounted with a connecting ring (64), both sides of the connecting ring (64) are connected with compression springs (65), and the bottom end of the detection tube (63) is fixedly connected with a bent foot (66).

2. A relative size detection mechanism according to claim 1, characterized in that: The detection head slider (21) and the reference slider (22) are both slidably connected to the column (1).

3. A relative size detection mechanism according to claim 1, characterized in that: The displacement sensor (3) comprises a connecting block (32) and a detecting block (33), wherein the connecting block (32) is fixedly mounted on one side of the detection head slider (21), and the detecting block (33) is fixedly mounted on one side of the reference slider (22), wherein the upper end of the connecting block (32) is fixedly connected to the sensor body (31), and a sensing probe (34) is connected between the connecting block (32) and the detecting block (33).

4. A relative size detection mechanism according to claim 1, characterized in that: The base (7) comprises a parts box (71), and a slideway (72) is provided on the bottom surface of the parts box (71).

5. A relative size detection mechanism according to claim 4, characterized in that: The fixing mechanism (8) includes a fixing frame (81), a mounting block (82) is installed at the bottom of the fixing frame (81), and the mounting block (82) is slidably installed in the slideway (72). An electric cylinder (83) is connected between the fixing frame (81) and the rear wall of the parts box (71). A circular groove is opened in the middle of the fixing frame (81), and a plurality of clamping components (84) are installed in an array inside the circular groove.

6. A relative size detection mechanism according to claim 5, characterized in that: The clamping assembly (84) includes a vertical plate (841), the inner side surface of the vertical plate (841) is provided with a slide groove (842), the upper end of the slide groove (842) is fixedly mounted with a first connecting frame (843), the lower end of the slide groove (842) is slidably mounted with a second connecting frame (844), the first connecting frame (843) and the second connecting frame (844) are both connected with a connecting rod (845), and are connected to a roller (846) through the connecting rod (845), and a tension spring (847) is connected between the first connecting frame (843) and the second connecting frame (844).

7. The relative size detection mechanism according to claim 1, characterized in that: A detection object (9) is clamped and installed in the middle of the fixing mechanism (8). The detection object (9) is a tubular body with a step provided inside. The detection object (9) includes a reference surface (91) and a detection surface (92). The detection size of the detection object (9) is the distance between the reference surface (91) and the detection surface (92).

Images