Distance measuring device

Abstract

The utility model relates to a distance measuring device, and belongs to the technical field of laser welding. The distance measuring device comprises a size measuring assembly and an adapter. The adapter is arranged in a light through hole of the laser processing head; the size measuring assembly is arranged on the adapter and freely slides in the axis direction of the laser machining head. The size measuring assembly is provided with scale values used for displaying the distance between the laser machining head and the surface of the workpiece. According to the distance measuring device, the laser welding working distance value can be directly obtained through the scale values on the measuring device, and the problems that in a direct measuring method, due to the fact that the axis of a tool and the axis of a laser machining head are not coaxial, measured data are poor in repeatability are solved. Besides, compared with a tool positioning method, the measuring device has universality, is simple in structure and convenient to use, avoids manufacturing of various positioning tools due to different welding angles and working distances, and saves test cost and period.

Description

Technical Field

[0001] The utility model relates to a distance measuring device, belonging to the technical field of laser welding. Background Art

[0002] Laser welding utilizes the excellent directionality and high power density of a laser beam. Through collimation, beam expansion, and focusing optics, the laser beam is focused onto a very small area. This creates a highly concentrated heat source within a very short time, melting the workpieces and forming strong welds and seams. As a highly flexible, precise, and efficient welding method, laser welding is gaining increasing popularity in industries such as engineering machinery, the automotive industry, steel and metallurgy, and new energy batteries. In particular, in the new energy battery industry, it has become standard equipment in lithium battery production lines.

[0003] Defocus refers to the degree of deviation of the laser beam from the welding focal position during the laser welding process. This parameter is directly related to the power density of the laser acting on the workpiece to be welded, and has a great influence on the weld width and depth, molten pool stability, and morphology. Laser welding usually requires a certain amount of defocus, because the power density at the center of the spot at the laser focus is too high, which can easily cause violent reactions in the material, forming pores, spatter, etc. On each plane away from the laser focus, the power density distribution is relatively uniform, which is conducive to achieving good weld formation and welding quality. During the laser welding process, the methods for measuring the defocus or working distance mainly include direct measurement and tool positioning. The direct measurement method is to use measuring tools such as calipers to directly measure the distance from the lens to the surface of the workpiece to be welded. The tool positioning method is to make tooling of different lengths according to different defocus amounts, and determine the welding defocus by the tooling length.

[0004] The above scheme has the following problems: when the axis of the laser processing head is perpendicular to the surface of the workpiece to be welded, the above two measurement methods are relatively accurate; however, when the laser processing head needs to be tilted at a certain angle for welding operations, the use of the above two measurement methods, especially the direct measurement method, will produce large errors when measuring the working distance, and thus the repeatability of the welding process parameters cannot be guaranteed, affecting the quality of laser welding. Utility Model Content

[0005] In view of the above problems, the utility model provides a distance measuring device.

[0006] The utility model adopts the following technical solutions:

[0007] A distance measuring device includes a size measuring component and an adapter;

[0008] The adapter is arranged in the light hole of the laser processing head;

[0009] The dimension measuring component is arranged on the adapter and slides freely along the axis direction of the laser processing head; the dimension measuring component is provided with a scale value for displaying the distance between the laser processing head and the workpiece surface.

[0010] The distance measuring device provided by the utility model utilizes the existing light-through hole to add an auxiliary measuring system, thereby reducing the need for modification of existing equipment, providing accurate and repeatable measurement data for welding operations, and improving welding quality.

[0011] In the distance measuring device of the utility model, the light-through hole of the laser processing head, the dimension measuring component and the adapter are coaxially arranged.

[0012] In the distance measuring device described in the present invention, the first cylindrical plate, the second cylindrical plate, and the cylindrical cavity tube of the adapter are coaxially arranged, the first cylindrical plate is located above the second cylindrical plate, and the diameter of the second cylindrical plate is larger than the diameter of the first cylindrical plate;

[0013] The planes of the first cylindrical plate and the second cylindrical plate have high flatness and can be in close and good contact with the bottom side of the light hole of the air curtain assembly of the laser processing head to ensure the coaxiality between the adapter and the laser processing head.

[0014] The second cylindrical plate is provided with threaded holes connected to the laser processing head. Four threaded holes are evenly distributed along the edge of the second cylindrical plate and arranged in a circle. The four threaded holes are connected and fixed between the adapter and the laser processing head air curtain assembly through threaded connection.

[0015] A fastening screw is provided radially at the bottom end of the cylindrical cavity tube;

[0016] A vent hole communicating with the cylindrical cavity tube is provided at the center of the first cylindrical plate.

[0017] In the distance measuring device described in the present invention, the measuring cylinder of the dimension measuring component is arranged in a cylindrical cavity, and a cone is arranged coaxially at the bottom end of the measuring cylinder. A smooth waist-shaped groove is provided in the cylindrical cavity, and the measuring cylinder is configured to have a waist-shaped structure that matches the inner cavity of the cylindrical cavity. The measuring cylinder and the cylindrical cavity are clearance-fitted and can move freely along the axis of the dimension measuring component.

[0018] The outer wall of the measuring cylinder is provided with a scale value. By reading the value, the laser welding working distance can be obtained.

[0019] The distance measuring device of the utility model has a detachable structure in which the measuring cylinder and the cone are fastened together by means of a positioning pin.

[0020] Beneficial effects

[0021] The distance measuring device provided by the utility model has the advantages that when the laser processing head and the surface of the workpiece to be welded are perpendicular or inclined at a certain angle, since the axis of the measuring device and the laser processing head always coincide with each other, one end of the measuring device is connected to the surface of the workpiece to be welded, and the laser welding working distance value can be directly obtained through the scale value on the measuring device, thereby avoiding the problem of poor repeatability of measurement data caused by the misalignment of the axis of the tool and the laser processing head in the direct measurement method.

[0022] In addition, compared with the tooling positioning method, this measuring device is universal and versatile, has a simple structure, and is easy to use. It avoids the need to manufacture various positioning tools due to different welding angles and working distances, saving test costs and cycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 1. It is a schematic diagram of the structure of the working distance measuring device;

[0024] Figure 2 It is a schematic diagram of a laser processing head integrated with a laser welding working distance measuring device;

[0025] Figure 3 This is a schematic diagram of the structure of a laser welding working distance measuring device;

[0026] Figure 4 This is a cross-sectional view of a laser welding working distance measuring device;

[0027] Icon: 1-Laser processing head, 2-Dimension measurement component, 3-Adapter;

[0028] 21- measuring cylinder, 22- cone;

[0029] 31-first cylindrical plate, 32-second cylindrical plate, 33-cylindrical lumen, 34-fastening screw;

[0030] 311-vent hole, 312-threaded hole.

[0031] 4-Light hole. DETAILED DESCRIPTION

[0032] To make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1As shown in the figure: a distance measuring device provided by the present invention includes a light hole 4 opened downward.

[0034] like Figure 2 As shown: the measuring device includes a dimension measuring component 2 and an adapter 3; the laser processing head 1, the dimension measuring component 2, and the adapter 3 are coaxially arranged; the adapter 3 is arranged in the light hole 4 of the laser processing head 1;

[0035] The dimension measuring component 2 is arranged on the adapter 3 and slides freely along the axis direction of the laser processing head 1; the dimension measuring component 2 is provided with a scale value for displaying the distance between the laser processing head and the workpiece surface.

[0036] like Figure 3 、 Figure 4 As shown: the adapter 3 includes a first cylindrical plate 31, a second cylindrical plate 32, a cylindrical cavity tube 33, and a fastening screw 34; the first cylindrical plate 31, the second cylindrical plate 32, and the cylindrical cavity tube 33 are coaxially arranged, the first cylindrical plate 31 is located above the second cylindrical plate 32, and the diameter of the second cylindrical plate 32 is larger than the diameter of the first cylindrical plate 31; a fastening screw 34 is radially provided at the bottom end of the cylindrical cavity tube 33; the second cylindrical plate 32 and the cylindrical cavity tube 33 can be continuously cast to form an integrated structure, and the second cylindrical plate 32 is annularly provided with four threaded through holes 312; the connection and fixation of the adapter 4 and the laser processing head air curtain assembly 2 are achieved through threaded connection.

[0037] The sizing assembly 2 comprises a measuring cylinder 21 and a cone 22. The measuring cylinder 21 is positioned within a cylindrical tube 33, with the cone 22 coaxially positioned at its base. The measuring cylinder 21 has a waist-shaped structure, while the cylindrical tube 33 has a waist-shaped trough. The measuring cylinder 21 is slightly smaller than the waist-shaped trough of the cylindrical tube 33, with a clearance fit between the two, allowing for free sliding movement along the axis of the cylindrical tube 33. Scale numbers are printed on the sidewalls of the waist-shaped structure of the measuring cylinder 21.

[0038] The measuring cylinder 21 and the cone 22 are positioned by a positioning pin 313; the cone 22 can be made of metal, plastic, etc. and can be disassembled and replaced according to the use of the cone tip.

[0039] A vent hole 311 is provided in the center of the first cylindrical plate 31 , which is connected to the cylindrical cavity 33 and opened along the axial direction, for exhausting gas during the movement of the measuring cylinder 21 .

[0040] The utility model provides a distance measuring device, the use method of which is as follows:

[0041] Before the size measuring device is installed, the size measuring component 2 and the adapter 3 are fastened and fixed by the fastening screws 34 on both sides of the bottom end of the cylindrical cavity 33.

[0042] After the device is installed, loosen the fastening screws 34 on both sides, and the dimension measuring component 2 falls slowly and freely along the axis direction of the laser processing head 1 to the workpiece surface. After the cone tip 22 contacts the workpiece surface, tighten the fastening screws 34 on both sides.

[0043] After the size measuring assembly 2 is fixed, the scale value on the side wall of the measuring cylinder 21 is read to obtain the laser welding working distance.

[0044] Furthermore, the dimensional measurement components 2 of different ranges can be replaced accordingly depending on the working distance under different working conditions. This device has a simple structure and is easy to operate. It ensures the repeatability of welding distance data results before the welding operation begins, helping to improve the stability and reliability of the laser welding process.

[0045] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A distance measuring device, characterized in that: It includes a dimension measuring component (2) and an adapter (3); The adapter (3) is arranged in the light hole (4) of the laser processing head (1); The dimension measuring component (2) is arranged on the adapter (3), and the dimension measuring component (2) slides freely along the axis direction of the laser processing head (1); The dimension measuring component (2) is provided with a scale value for displaying the distance between the laser processing head and the workpiece surface.

2. The distance measuring device according to claim 1, wherein: The light hole (4), the dimension measuring component (2), and the adapter (3) of the laser processing head (1) are coaxially arranged.

3. The distance measuring device according to claim 1, wherein: The adapter (3) comprises a first cylindrical plate (31), a second cylindrical plate (32), a cylindrical cavity (33), and a fastening screw (34); the first cylindrical plate (31), the second cylindrical plate (32), and the cylindrical cavity (33) are coaxially arranged, the first cylindrical plate (31) is located above the second cylindrical plate (32), and the diameter of the second cylindrical plate (32) is larger than the diameter of the first cylindrical plate (31); A fastening screw (34) is radially provided at the bottom end of the cylindrical cavity tube (33); A vent hole (311) communicating with the cylindrical cavity tube (33) is provided at the center of the first cylindrical plate (31).

4. The distance measuring device according to claim 3, wherein: The second cylindrical plate (32) is provided with a threaded hole (312) connected to the laser processing head (1).

5. The distance measuring device according to claim 1 or 3, characterized in that: The size measuring assembly (2) comprises a measuring cylinder (21) and a cone (22); the measuring cylinder (21) is arranged in a cylindrical cavity (33), and the cone (22) is coaxially arranged at the bottom end of the measuring cylinder (21).

6. The distance measuring device according to claim 5, characterized in that: Scale values ​​are provided on the outer side wall of the measuring cylinder (21).

7. The distance measuring device according to claim 5, wherein: The measuring column (21) has a waist-shaped column structure, and the inner cavity of the cylindrical cavity tube (33) has a waist-shaped trough structure.

8. The distance measuring device according to claim 4, characterized in that: The measuring cylinder (21) and the cone (22) are of a separable structure.

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