Composite positioning device for laser cutting and laser cutting machine

Abstract

The present invention discloses a composite positioning device for laser cutting and a laser cutting machine, wherein the composite positioning device for laser cutting comprises a first positioning mechanism and a second positioning mechanism for collecting product position information; the first positioning mechanism comprises at least two displacement sensors arranged in parallel and spaced apart, and the detection rod of the displacement sensor is used to contact the first side of the product; the second positioning mechanism comprises two CCD cameras arranged in relative spacing, and the two CCD cameras are used to capture two opposite second sides of the product, and the two opposite second sides are respectively adjacent to the first side. The composite positioning device for laser cutting of the present invention has low cost and accurate positioning, and can adapt to fast and continuous high-precision positioning.

Description

Technical Field

[0001] The invention relates to the technical field of laser cutting product positioning, and in particular to a composite positioning device for laser cutting and a laser cutting machine. Background Art

[0002] Laser cutting uses a focused high-power density laser beam to irradiate the workpiece, causing the irradiated material to melt, vaporize, ablate or reach ignition point rapidly, while using a high-speed airflow coaxial with the beam to blow away the molten material, thereby achieving the cutting of the workpiece.

[0003] Before laser cutting, it is usually necessary to locate the product to be cut to obtain its position information, so as to further determine the processing position of the product. The existing laser cutting positioning mainly adopts two methods: using multiple sets of CCD cameras to capture the outline of the product or using multiple sets of mechanical positioning structures.

[0004] At present, the single positioning method of using multiple groups of CCD cameras to capture is very costly; and the single positioning method of using multiple groups of mechanical positioning structures is not accurate enough compared to CCD camera capture positioning, and cannot achieve fast and continuous high-precision positioning. Summary of the invention

[0005] The main purpose of the present invention is to propose a composite positioning device for laser cutting, aiming to solve the technical problems that the current laser cutting product positioning single use of multiple groups of CCD cameras is costly and the single use of mechanical positioning structure is not accurate enough.

[0006] To achieve the above-mentioned object, the present invention provides a composite positioning device for laser cutting, which comprises a first positioning mechanism and a second positioning mechanism for collecting product position information;

[0007] The first positioning mechanism comprises at least two displacement sensors arranged in parallel and spaced apart, and the detection rod of the displacement sensor is used to contact the first side edge of the product;

[0008] The second positioning mechanism includes two CCD cameras that are relatively spaced apart from each other. The two CCD cameras are used to capture two relatively second side edges of the product, and the two relatively second side edges are respectively adjacent to the first side edge.

[0009] Preferably, the first positioning mechanism further comprises a mounting plate arranged corresponding to the displacement sensor and a first driving module for driving the mounting plate to move;

[0010] The detection rod of the displacement sensor is slidably arranged on the mounting plate and is connected with an elastic member. The mounting plate is provided with a push plate which can move back and forth along the rod body direction of the detection rod of the displacement sensor. The push plate can abut against the detection rod of the displacement sensor to make the elastic member in a compressed state.

[0011] Preferably, an elastic plate is provided on the push plate.

[0012] Preferably, a boss for the push plate to abut is constructed on the detection rod of the displacement sensor, and the elastic member and the push plate are located on opposite sides of the boss.

[0013] Preferably, a mounting seat is provided on the mounting plate, and the detection rod of the displacement sensor is passed through the mounting seat;

[0014] The elastic member is a spring sleeved on the detection rod of the displacement sensor, and two ends of the spring are respectively connected to the mounting seat and the boss.

[0015] Preferably, the first driving module comprises a lifting component for driving the mounting plate to move up and down and a driving component for driving the mounting plate to move horizontally.

[0016] Preferably, the second positioning mechanism further comprises a mounting frame for mounting the CCD camera and a second driving module for driving the mounting frame to move.

[0017] Preferably, the second positioning mechanism further comprises a fill light provided on the mounting frame and arranged corresponding to the CCD camera, and an adjustment component for adjusting a fixed angle of the fill light.

[0018] The present invention also provides a laser cutting machine, which includes the composite positioning device for laser cutting described above.

[0019] The beneficial effects of the technical solution of the present invention are:

[0020] The composite positioning device for laser cutting can collect the outer contour information of the product through the displacement sensor of the first positioning mechanism and the CCD camera of the second positioning mechanism, and perform corresponding conversion calculations on it, so as to accurately obtain the position information of the product so as to determine the processing position of the product; compared with the current positioning method of using only multiple groups of CCD cameras or only multiple groups of mechanical positioning structures, the composite positioning device for laser cutting adopts a positioning method combining displacement sensors and CCD cameras, which reduces the number of CCD cameras used, has low cost and accurate positioning, and can adapt to fast and continuous high-precision positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the structure of a composite positioning device for laser cutting in one embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic structural diagram of a portion of a first positioning mechanism of a composite positioning device for laser cutting;

[0023] Figure 3 for Figure 1 A structural schematic diagram of another part of the first positioning mechanism of the composite positioning device for laser cutting;

[0024] Figure 4 for Figure 1 A schematic structural diagram of a portion of the second positioning mechanism of a composite positioning device for laser cutting. DETAILED DESCRIPTION

[0025] The scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiments of the present invention, not all of the embodiments. Based on the 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.

[0026] The present invention proposes a composite positioning device for laser cutting, referring to Figure 1 , the composite positioning device for laser cutting includes a first positioning mechanism and a second positioning mechanism for collecting product position information;

[0027] The first positioning mechanism includes at least two displacement sensors 100 arranged in parallel and spaced apart, and the detection rod 110 of the displacement sensor is used to contact the first side edge of the product;

[0028] The second positioning mechanism includes two CCD cameras 200 that are spaced apart from each other. The two CCD cameras 200 are used to capture two opposite second side edges of the product, and the two opposite second side edges are respectively adjacent to the first side edge.

[0029] The composite positioning device for laser cutting of this embodiment is mainly used on laser cutting equipment to locate the product to be cut and obtain its position information, so as to further determine the processing position of the product. Of course, based on the structural composition of the composite positioning device, technicians can also make adaptive settings and applications on other mechanical equipment, not just limited to the field of laser cutting.

[0030] Specifically, the composite positioning device for laser cutting is composed of a first positioning mechanism and a second positioning mechanism. The first positioning mechanism includes at least two displacement sensors 100, and the second positioning mechanism includes two CCD cameras 200. The displacement sensors 100 and CCD cameras 200 of the composite positioning device are in the same coordinate system and have their own absolute coordinate values. The product is square, and its four sides are all right-angled sides. In actual settings, refer to Figure 1 , the displacement sensors 100 can be located together in the forward direction of the product, so that after the product advances along the X direction and reaches the stop position (the stop position can be a processing station on the equipment), the end of the detection rod 110 of the displacement sensor 100 contacts the first side of the product to collect the outer contour information of the product in the X direction. Among them, at least two displacement sensors 100 are set. It is easy to understand that two single coordinate points can be obtained by converting and calculating the detection information of the two displacement sensors 100, and a straight line (corresponding to the first side of the product) is formed by a two-point fitting method. Then, according to the corresponding calculation based on the straight line, the long-distance X-coordinate value of the first side of the product can be obtained. When more than two displacement sensors 100 are set, a corresponding number of single coordinate points can be obtained, corresponding to the formation of a straight line by a multi-point fitting method. Considering cost savings, two displacement sensors 100 in this embodiment are preferably set.

[0031] Reference Figure 1 , the two CCD cameras 200 are located on opposite sides of the product's forward direction, arranged at a certain distance along the Y direction, and correspondingly on a center line of the product processing position, so that after the product advances to the stop position along the X direction, the two opposite second sides of the product are captured from top to bottom, respectively, to collect the outer contour information of the product in the Y direction. Among them, the width of the product (i.e., the length of the first side) can be obtained by calculating the Y coordinate values ​​of the two second sides. Specifically, the two CCD cameras 200 correspondingly capture a section of the two second sides, and extend them in a straight line to obtain the long-distance Y coordinate values ​​of the two second sides, and intersect with the fitting straight line of the first side to form an intersection. According to the intersection coordinate values, the long-distance X coordinate values, and the long-distance Y coordinate values, the angle value of the product side relative to the standard coordinate axis can be calculated and analyzed (if the product has an angle and position offset at the stop position), and the position information of the product can be calculated and analyzed.

[0032] Among them, the composite positioning device needs to use a processor to perform relevant software algorithm operations on the information collected by the displacement sensor 100 and the CCD camera 200. The processor may belong to the main control part of the laser cutting equipment, or be independently set for the composite positioning device and belong to a component of the composite positioning device. When it is set on the laser cutting equipment, it is communicated with the main control part of the laser cutting equipment to perform data communication.

[0033] Among them, the CCD camera 200 is a non-contact detection, which can effectively avoid interference with the processing position, and the positioning is convenient and fast; the displacement sensor 100 is a contact detection, and its detection rod 110 directly contacts the edge of the product for detection. In addition, the composite positioning device for laser cutting is suitable for large-sized products and can achieve large-scale, high-resolution, and long-distance accurate positioning.

[0034] Compared with the current positioning method that only uses multiple groups of CCD cameras 200 or only uses multiple groups of mechanical positioning structures, the composite positioning device for laser cutting uses a positioning method that combines a displacement sensor 100 and a CCD camera 200 to realize the collection of product position data, reduce the number of CCD cameras 200 used, have low cost and accurate positioning, and can adapt to fast and continuous high-precision positioning.

[0035] In one embodiment, referring to Figure 2 and Figure 3 The first positioning mechanism further includes a mounting plate 300 corresponding to the displacement sensor 100 and a first driving module 400 for driving the mounting plate 300 to move;

[0036] The detection rod 110 of the displacement sensor 100 is slidably arranged on the mounting plate 300 and is connected to an elastic member 10. The mounting plate 300 is provided with a push plate 20 that can move back and forth along the rod body direction of the detection rod 110 of the displacement sensor 100. The push plate 20 can abut against the detection rod 110 of the displacement sensor 100 to make the elastic member 10 in a compressed state.

[0037] In this embodiment, by driving the mounting plate 300 by the first driving module 400, the displacement sensor 100 can reach the detection position from its origin position, contact the product to collect position data; and can be reset to the origin position after the detection is completed. The origin position of the displacement sensor 100 is located below the product. During the reset process driven by the first driving module 400, the displacement sensor 100 moves below the product to avoid collision with the product, resulting in damage to the product or the displacement sensor 100. After resetting to the origin position, the displacement sensor 100 will not interfere with the product, and the product can be subsequently processed and discharged.

[0038] Among them, through the elastic member 10, the detection rod 110 of the displacement sensor 100 can be in elastic contact with the edge of the product for detection, which can improve the protection of the two; the push plate 20 has two functions, one is to limit the detection rod 110 of the displacement sensor 100, and to keep the elastic member 10 in an elastic state, and the other is that the push plate 20 can move toward the product along the rod body direction of the detection rod 110. In this process, the detection rod 110 is moved toward the product by the elastic member 10 and first contacts the product, and then the push plate 20 contacts the product to pre-position the product. Alternatively, the push plate 20 can be driven by a cylinder. After the detection is completed, under the drive of the cylinder, the push plate 20 can move along the rod body direction of the detection rod 110 to push the detection rod 110 to slide away from the product, thereby separating the detection rod 110 from the product.

[0039] In one embodiment, referring to Figure 3 , an elastic plate 30 is provided on the push plate 20. The elastic plate 30 is used to achieve flexible contact with the product and play a protective role. Among them, the elastic plate 30 is preferably made of eutectic material.

[0040] In one embodiment, referring to Figure 3 , a boss 111 for abutting the push plate 20 is constructed on the detection rod 110 of the displacement sensor 100, and the elastic member 10 and the push plate 20 are located on opposite sides of the boss 111. The boss 111 is an annular boss 111 integrally formed with the detection rod 110, and a semicircular notch for the detection rod 110 to pass through is constructed on one side edge of the push plate 20, and the push plate 20 abuts against one side of the boss 111, and the elastic member 10 is connected to the other side of the boss 111. Based on the above structural arrangement, it is easy to understand that when the push plate 20 moves away from the product along the rod body direction of the detection rod 110, it can slide the detection rod 110 by acting on the boss 111, and the boss 111 can further compress the elastic member 10; and when the push plate 20 moves toward the product along the rod body direction of the detection rod 110, the elastic member 10 can move the detection rod 110 toward the product by acting on the boss 111.

[0041] In one embodiment, referring to Figure 3 , a mounting seat 40 is provided on the mounting plate 300, and a detection rod 110 of the displacement sensor 100 is passed through the mounting seat 40;

[0042] The elastic member 10 is a spring sleeved on the detection rod 110 of the displacement sensor 100 , and two ends of the spring are respectively in contact with the mounting seat and the boss 111 .

[0043] Specifically, the mounting seat 40 is fixedly arranged on the mounting plate 300, and a through hole matching the detection rod 110 is provided on the mounting seat 40, and the detection rod 110 passes through the through hole to slide with the mounting seat 40. The elastic member 10 is preferably a spring, which has a simple structure and is easy to set.

[0044] In one embodiment, referring to Figure 2 , the first driving module 400 includes a lifting assembly 410 for driving the mounting plate 300 to move up and down and a driving assembly 420 for driving the mounting plate 300 to move horizontally. Specifically, the first driving module 400 is composed of a lifting assembly 410 and a driving assembly 420, which can realize the driving of the mounting plate 300 in the up and down directions and the horizontal directions, specifically in the Z-axis direction and the X-axis direction. In this embodiment, the lifting assembly 410 includes a cylinder and a guide rail slider, and the driving assembly 420 includes a motor screw and a guide rail slide rail. Of course, the use of this specific driving device is only exemplary and not restrictive.

[0045] In one embodiment, referring to Figure 1 and Figure 4 The second positioning mechanism also includes a mounting frame 500 for mounting the CCD camera 200 and a second driving module 600 for driving the mounting frame 500 to move. When the second driving module 600 drives the mounting frame 500, the CCD camera 200 can move horizontally above the product to adjust its capture position, specifically in the Y-axis direction. Figure 1 Two mounting frames 500 and two second drive modules 600 are provided to realize the independent driving of two CCD cameras 200 respectively, and two second drive modules 600 are installed through a gantry bracket. The second drive module 600 includes a motor lead screw and a guide rail slider. Of course, the use of the specific drive device is only exemplary and not restrictive.

[0046] In one embodiment, referring to Figure 4 The second positioning mechanism also includes a fill light 700 disposed on the mounting frame 500 and arranged corresponding to the CCD camera 200, and an adjustment component for adjusting the fixed angle of the fill light 700. Among them, by irradiating the edge of the product with the fill light 700 for fill light, the quality of the image captured by the CCD camera 200 can be improved, which helps to improve the measurement accuracy. In addition, by operating the adjustment component, the fixed angle of the fill light 700 can be adjusted when positioning products of different sizes, thereby adjusting its irradiation angle. The structural form of the adjustment component can be various, for example, the dimming component includes a connecting seat, the fill light 700 is fixed on the connecting seat, the connecting seat is ball-hinged with the mounting frame, and the fixed angle of the fill light 700 can be adjusted by rotating the connecting seat, including but not limited to this, and the adjustment component can also adopt other structural forms.

[0047] The present invention also proposes a laser cutting machine, which includes the composite positioning device for laser cutting described above. The specific structure of the composite positioning device for laser cutting refers to the above-mentioned embodiment. Since the laser cutting machine adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the technical effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0048] It should be noted that the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A composite positioning device for laser cutting, characterized in that: It includes a first positioning mechanism and a second positioning mechanism for collecting product location information; The first positioning mechanism includes at least two displacement sensors arranged in parallel and at intervals, and the detection rod of the displacement sensor is used to contact the first side edge of the product; the first positioning mechanism also includes a mounting plate arranged corresponding to the displacement sensor and a first driving module for driving the mounting plate to move; the detection rod of the displacement sensor is slidably arranged on the mounting plate and is connected to an elastic member, and the mounting plate is provided with a push plate that can move back and forth along the rod body direction of the detection rod of the displacement sensor, and the push plate can abut against the detection rod of the displacement sensor to make the elastic member in a compressed state; a boss for the abutment of the push plate is constructed on the detection rod of the displacement sensor, and the elastic member and the push plate are located on opposite sides of the boss; a mounting seat is provided on the mounting plate, and the detection rod of the displacement sensor is passed through the mounting seat; the elastic member is a spring sleeved on the detection rod of the displacement sensor, and the two ends of the spring are respectively connected to the mounting seat and the boss; The second positioning mechanism includes two CCD cameras that are relatively spaced apart from each other. The two CCD cameras are used to capture two relatively second side edges of the product, and the two relatively second side edges are respectively adjacent to the first side edge.

2. The composite positioning device according to claim 1, characterized in that: An elastic plate is arranged on the push plate.

3. The composite positioning device according to claim 1, characterized in that: The first driving module includes a lifting component for driving the mounting plate to move up and down and a driving component for driving the mounting plate to move horizontally.

4. The composite positioning device according to claim 1, characterized in that: The second positioning mechanism also includes a mounting frame for mounting the CCD camera and a second driving module for driving the mounting frame to move.

5. The composite positioning device according to claim 4, characterized in that: The second positioning mechanism also includes a fill light arranged on the mounting frame and an adjustment component for adjusting the fixed angle of the fill light.

6. A laser cutting machine, characterized in that: A composite positioning device for laser cutting comprising the laser cutting device described in any one of claims 1-5.

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