Laser head anti-collision detection early warning device

Abstract

The utility model discloses a laser head anti-collision detection early warning device which comprises a fixing disc, the fixing disc is connected with a supporting disc, the supporting disc is located in an air pressure chamber formed by a shell and a base, the supporting disc is provided with a spring used for supporting, and the supporting disc abuts against an air leakage opening of the air pressure chamber under the action of the spring. The air pressure chamber is provided with an air pressure sensor used for detecting changes of air pressure in the air pressure chamber, when the fixing disc is collided, the supporting disc is displaced and leaks air, and then the air pressure sensor gives an alarm.

Description

Technical Field

[0001] The utility model belongs to collision detection technology, and specifically relates to a laser head anti-collision detection and early warning device. Background Art

[0002] At present, with the promotion of laser applications in the manufacturing industry, laser welding equipment is becoming more and more popular in the market. Compared with traditional welding processes, laser welding processes are more adaptable, more flexible, and self-melting, and do not require consumables. With the development of the market, laser welding products are becoming more and more diverse, and welding paths are becoming more and more complex, which requires higher precision for the equipment. Since the laser welding head is a precision component, any collision will cause damage to the welding head and reduce the accuracy; in order to prevent collisions during human operation or equipment operation, the equipment must meet anti-collision requirements during operation. Most of the current laser heads are fixedly connected. During the welding process, if a collision occurs, when the collision is severe, it will not only cause the coaxial air nozzle to fall, but also cause the equipment to be damaged by collision.

[0003] There are two main solutions to avoid damage to laser welding equipment. One is to set up detection devices, including infrared, distance sensors, etc., to conduct advance detection and issue an early warning when the laser collides. However, this technical means has false alarms and is costly. At the same time, considering the needs of processing, the movement trajectory of the robot arm will often be affected by the close distance of the workpiece, causing alarms, and it is impossible to achieve maximum flexibility in welding processing. The other method is to start and stop the program in time during the collision contact process, supplemented by the setting of protective devices. It may only damage the protective device to a certain extent without damaging the laser head and its components. Therefore, this type of technical means is widely used. After all, collision is an accidental event and an error operation event. This method will not affect the welding trajectory. There are no high requirements for the contact distance of the workpiece or the surrounding equipment, and it is more flexible. Summary of the invention

[0004] Purpose of the utility model: The utility model aims to provide a laser head anti-collision detection and warning device, which is used to give an early warning when the laser head is about to collide.

[0005] Technical solution: A laser head anti-collision detection and warning device includes a fixed plate, which is connected to a supporting plate. The supporting plate is located in an air pressure chamber formed by a shell and a base, and the supporting plate is provided with a spring for support. Under the action of the spring, the air pressure port of the air pressure chamber is pressed against. The air pressure chamber is provided with an air pressure sensor for detecting changes in gas pressure in the air pressure chamber. When the fixed plate is collided, the supporting plate is displaced and air is deflated, and the air pressure sensor thereby generates an alarm.

[0006] Furthermore, the base is used to connect the welding robot, the fixed plate is used to fix the laser head, and a fixed plate is provided on the fixed plate to prevent the laser head from tilting downward due to its own weight during installation.

[0007] The spring is provided with a spring limit seat for fixing the spring position;

[0008] The support plate is provided with a positioning hole, and the positioning hole cooperates with the spring limit seat to limit the rotatable angle of the support plate.

[0009] Furthermore, the air pressure chamber is provided with an air inlet for connecting to an air source.

[0010] Furthermore, the base and the shell are fastened by screws, and a sealing ring is provided at the connection;

[0011] The support plate and the shell are mirror contact sealed.

[0012] There is a circle of protrusions on the contact surface between the support plate and the shell, and the contact is mirror surface.

[0013] Furthermore, a round head fixing screw is provided on the shell, and the round head fixing screw matches the conical groove of the support plate. After a collision occurs, the round head fixing screw slides out of the conical groove to generate displacement, forcing one side of the support plate to tilt.

[0014] Furthermore, the device rotates the support plate so that the round head fixing screw falls into the conical groove to achieve return.

[0015] Beneficial effects: The laser head anti-collision detection and warning device provided by the utility model is connected to the laser head through a fixed plate, is connected to the robot arm through a base, detects whether a collision occurs through the air pressure change in the air pressure chamber inside the shell, and can also return to its position to realize repeated detection, without causing damage to related equipment and components, and without affecting various welding work trajectories in three-dimensional space, and without hindering welding work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the assembly structure of the device described in the utility model;

[0017] Figure 2 It is a cross-sectional view of the device described in the utility model Figure 1 ;

[0018] Figure 3 It is a cross-sectional view of the device described in the utility model Figure 2 ;

[0019] Figure 4 It is a schematic diagram of the installation assembly structure of the support plate and the spring limit seat in the device of the utility model;

[0020] Figure 5 It is a schematic diagram of the installation structure of the base, shell and sealing ring;

[0021] Figure 6 It is a schematic diagram of the structure of a round head set screw and a tapered groove;

[0022] Figure 7 It is a schematic diagram of the installation structure of the fixed disk and the fixed plate.

[0023] In the figure: 1. shell, 2. fixing plate, 3. base, 4. spring limit seat, 5. spring, 6. screw, 7. support plate, 8. air pressure sensor, 9. air inlet, 10. positioning hole, 11. sealing ring, 12. round head fixing screw, 13. conical groove, 14. fixing plate. DETAILED DESCRIPTION

[0024] In order to explain the technical solution provided by the utility model in detail, a further introduction is given below in conjunction with the accompanying drawings of the specification.

[0025] The utility model provides a laser head anti-collision detection and early warning device, combined with Figure 1 As shown in the figure, the device is a sensor that is compatible with the laser head and the robot. It is installed between the robot and the laser head and has a spring. When the robot carrying the laser head collides with a solid, it can generate pressure on the anti-collision sensor to deform the spring, causing the support plate to tilt and causing the air pressure chamber to leak. The air pressure chamber leaks and the internal air pressure drops rapidly. The change in air pressure will be sensed by the air pressure sensor, which will send an alarm signal to remind the operator.

[0026] Combination Figure 2 and Figure 3 As shown, first, the device includes a fixed disk 2 for connecting the laser head. The fixed disk 2 is located on the shell 1, and there is an air pressure chamber inside the shell 1. In order to facilitate disassembly and subsequent maintenance, replacement and debugging, the air pressure chamber uses a base 3 as a sealing surface of the air pressure chamber. The base 3 and the shell 1 form an air pressure chamber located inside the shell 1. The opposite side of the base 3 is the installation position of the fixed disk 2. The fixed disk 2 is used to connect with the support disk 7, and the fixed disk 2 is also used to sense the external collision and then link the support disk 7 to achieve dislocation, and then cause deflation, thereby affecting the air pressure change of the air pressure chamber, which is detected by the air pressure sensor 8. Based on the change in the value detected by the air pressure sensor 8, an early warning can be further set or the welding operation can be stopped.

[0027] About fixed disk 2, combined Figure 2 and Figure 3As shown in the positional relationship, the fixed disk 2 is embedded in the shell 1, and the bottom of the fixed disk 2 is connected to the support disk 7. The upper surface of the support disk 7 is a mirror surface, which fits the upper opening of the shell 1. In order to achieve the upward fit of the support disk 7, a spring 5 is provided at the center of the support disk 7 for support. In order to prevent the spring 5 from twisting and deforming, a spring limit seat 4 is provided. The spring 5 is located in the middle of the spring limit seat 4 and can be extended up and down. The existence of the spring limit seat 4 further limits the rotation and misalignment of the support disk 7, that is, combined with Figure 4 It can be seen that a rectangular hole is set in the middle of the support plate 7 for installing the spring limit seat 4. The spring limit seat 4 is fixed to the base 3 by screws 6, and the side wall of the spring limit seat 4 can fit the inner wall of the rectangular hole, so the support plate 7 can only move up and down. It should be pointed out that setting the through hole in the support plate 7 as a rectangular hole can also limit the rotation angle of the support plate 7. When it rotates a certain angle, it will be hindered by the side of the rectangular hole. When the fixed plate 2 is hit, it will cause the support plate 7 to be misaligned, which will cause the air pressure chamber to deflate, and then the operator can be reminded to stop in time or trigger the stop switch through the change of the air pressure in the air pressure chamber to suspend the welding operation.

[0028] The air pressure chamber is provided with an air inlet 9 on one side of the housing 1 for connecting air source equipment including an air pump. An air pressure sensor 8 can be provided through a through hole on other side positions of the housing 1 for real-time monitoring of the air pressure in the air pressure chamber. During use, a constant pressure airflow can be supplied through the air inlet 9, or intermittent air supply can be provided to keep the pressure of the air pressure chamber within a normal fluctuation range.

[0029] The presence of the base 3 facilitates the installation of the spring limit seat 4 and the installation of components such as the spring 5 in the air pressure chamber, and also facilitates assembly and reduces the manufacturing cost of the one-piece molding of the air pressure chamber, but it will lead to the problem of insufficient sealing. Therefore, on the basis of the close fitting arrangement of the base 3 and the shell 1, a sealing ring 11 is provided at the fitting position of the base 3 and the shell 1, such as Figure 5 shown.

[0030] Figure 6 Another method of improving the sealing of the support plate 7 and achieving air release is shown. In the process of the support plate 7 being misaligned, in addition to the support plate 7 being pressed downward as a whole to separate from the upper inner wall of the housing 1, a tilting method can also be adopted. A round head fixing screw 12 is provided on the housing 1. The round head fixing screw 12 matches the shape of the conical groove 13 on the support plate 7. After a collision occurs, the round head fixing screw 12 slides out of the conical groove 13, forcing the support plate to tilt on one side. Thus, the pressure is released through the air outlet above the housing 1.

[0031] Figure 7A preferred mode of application shown is that in order to prevent the laser head from tilting downward due to its own weight when installed when not in use, a fixing plate 14 is provided on the side of the fixing plate 2, which can limit the displacement of the fixing plate 2 and also serve as a certain counterweight.

Claims

1. A laser head anti-collision detection and warning device, characterized in that: The invention comprises a fixed plate (2), wherein the fixed plate (2) is connected to a support plate (7), the support plate (7) is located in an air pressure chamber formed by a shell (1) and a base (3), and the support plate (7) is provided with a spring (5) for supporting the support plate (7), and under the action of the spring (5), the support plate (7) is pressed against an air leakage port of the air pressure chamber, and the air pressure chamber is provided with an air pressure sensor (8) for detecting changes in the air pressure in the air pressure chamber. When the fixed plate (2) is impacted, the support plate (7) is displaced and air is discharged, and the air pressure sensor (8) thereby generates an alarm.

2. The laser head anti-collision detection and warning device according to claim 1, characterized in that: The base (3) is used to connect the welding robot, the fixing plate (2) is used to fix the laser head, and a fixing plate (14) is provided on the fixing plate (2) to prevent the laser head from tilting downward due to its own weight during installation.

3. The laser head anti-collision detection and warning device according to claim 1, characterized in that: The spring (5) is provided with a spring limiting seat (4) for fixing the position of the spring.

4. The laser head anti-collision detection and warning device according to claim 1, characterized in that: The support plate (7) is provided with a positioning hole (10), and the positioning hole (10) cooperates with the spring limit seat (4) to limit the rotatable angle of the support plate (7).

5. The laser head anti-collision detection and warning device according to claim 1, characterized in that: The air pressure chamber is provided with an air inlet (9) for connecting to an air source.

6. The laser head anti-collision detection and warning device according to claim 1, characterized in that: The base (3) and the housing (1) are fastened by screws, and a sealing ring is provided at the connection.

7. The laser head anti-collision detection and warning device according to claim 1, characterized in that: The support plate (7) and the housing (1) are in mirror contact sealing.

8. The laser head anti-collision detection and warning device according to claim 1, characterized in that: There is a circle of protrusions on the contact surface between the support plate (7) and the shell (1), and the contact is mirror surface.

9. The laser head anti-collision detection and warning device according to claim 1, characterized in that: The housing (1) is provided with a round head fixing screw (12), which matches the conical groove (13) of the support plate (7). After a collision occurs, the round head fixing screw (12) slides out of the conical groove (13) to generate displacement, forcing one side of the support plate (7) to tilt.

10. The laser head anti-collision detection and warning device according to claim 9, characterized in that: The device rotates the support plate (7) so that the round head fixing screw (12) falls into the conical groove (13) to achieve return.

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