Universal gripper for stud welding without grounding electrode

Abstract

The utility model relates to the technical field of universal grippers, and discloses a universal gripper for stud welding without a grounding electrode. Comprising a supporting block, a pressing block, a pressing arm, a cushion block, a lining, a first gasket, a first connecting piece, an SMC speed regulating valve, a second connecting piece, a powerful tightening cylinder, an air cylinder pressing arm, a third connecting piece, a fourth connecting piece, a second gasket, a fifth connecting piece, a sixth connecting piece, an octagonal pipe, a first insulating pin and a second insulating pin. And the first gasket is arranged between the pressing block and the pressing arm. According to the universal hand grab without the grounding electrode, the pressing block material is replaced, so that the space is not occupied; when in use, the pressing blocks on the grippers are better attached to a plate and a pipe, so that the conductivity is increased, the installation space of the grounding electrode is saved, more space is provided for optimizing the track, and the operation is convenient, time-saving and labor-saving.

Description

Technical Field

[0001] The utility model relates to the technical field of general grippers, in particular to a general gripper for stud welding without a grounding electrode. Background Technique

[0002] Throughout the world, robot stud welding remains the mainstream welding technology in automobile parts factories. Robot stud welding consists of (stud welding gun, mechanical gripper, grounding electrode) and a robot. The mechanical gripper mainly consists of a valve island, a powerful clamping cylinder, an SMC speed control valve, a support block, a pressure block, a pressure arm, a spacer block, a connecting piece, a cylinder pressure arm, an octagonal tube, a gasket, an insulating pin, etc. Usually during welding production, the stud welding makes the other end of the stud contact the surface of the plate (pipe fitting), conducts electricity to generate an arc, and applies a certain pressure to the stud after the contact surface melts to form a firm fixation. During the process of stud welding, the drying temperature of the ceramic ring, the material of the ceramic ring, the material of the stud, the carbon content of the base material, the welding position, the rust removal and coating of the workpiece surface will all greatly affect the welding quality. Improper setting of welding specifications is also likely to affect welding defects, such as: insufficient weld size, too long stud length, too large or too small process parameters, arc blow-off, etc. During the welding process, the gripper's gripping plate does not fit well with the grounding electrode, so the fitting of the grounding electrode cannot be well controlled. At the same time, after installing the grounding electrode, the load and space of the robot are greatly reduced, which affects the adjustment and optimization of the robot's operation and trajectory.

[0003] In order to eliminate the influence of these adverse factors on the welding quality, it is necessary to regularly replace the grounding electrode and the grounding wire. At the same time, after welding is completed, personnel need to check the end face of the welded stud. This incurs a large amount of time cost in production, and false welding affects the quality. Therefore, a general gripper without a grounding electrode is needed to solve this problem. Content of the Utility Model

[0004] (I) Technical Problem to be Solved

[0005] In view of the deficiencies of the prior art, the utility model provides a general gripper for stud welding without a grounding electrode to solve the problems raised in the above background technique.

[0006] (II) Technical Solution

[0007] To achieve the above object, the utility model provides the following technical solution: A general gripper for stud welding without a grounding electrode, including a support block, a pressure block, a pressure arm, a spacer block, a bushing, a first gasket, a first connecting piece, an SMC speed control valve, a second connecting piece, a powerful clamping cylinder, a cylinder pressure arm, a third connecting piece, a fourth connecting piece, a second gasket, a fifth connecting piece, a sixth connecting piece, an octagonal tube, a first insulating pin and a second insulating pin. The support block is arranged at the lower end of the pressure block, and the first gasket is arranged between the pressure block and the pressure arm.

[0008] Preferably, the pressing block is fixedly connected to the pressing arm through a second insulating pin, and the second insulating pin serves to block the current.

[0009] Preferably, the supporting block is fixedly connected to the cushion block through a first insulating pin, and the first insulating pin serves to block the current.

[0010] Preferably, a fifth connecting piece is arranged on one side of the lower end of the octagonal tube, and the upper end of the octagonal tube is fixedly connected to the second gasket through a fourth connecting piece, a first connecting piece and a third connecting piece.

[0011] Preferably, the supporting block is made of copper material and is connected to the ground wire. The conductivity is increased by the copper material, and the virtual soldering rate of the product is reduced.

[0012] Preferably, the first gasket is processed according to the pressing block and the pressing arm, reducing the weight and space of the pressing block and the pressing arm.

[0013] Preferably, a general gripper for stud welding without a grounding electrode is characterized in that a dust-proof net is installed inside the octagonal tube, and the dust-proof net is fixed to the inner wall of the octagonal tube through a magnetic attraction structure. The dust and sundries falling into the octagonal tube are collected by the dust-proof net for easy cleaning.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the present utility model provides a general gripper for stud welding without a grounding electrode, having the following beneficial effects:

[0016] 1. The general gripper without a grounding electrode has a design of replacing the material of the pressing block and does not occupy space. During use, the conductivity is increased by better fitting of the pressing block on the gripper with the plate member and the pipe member, saving the space for installing the grounding electrode, and enabling more space to optimize the trajectory operation, which is convenient, time-saving and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 is a schematic diagram of the structure of the supporting block of the present utility model;

[0019] Figure 3 is a schematic diagram of the structure of the pressing block of the present utility model.

[0020] In the figure: 1. Supporting block; 2. Pressing block; 3. Pressing arm; 4. Spacer block; 5. Bushing; 6. First gasket; 7. First connecting piece; 8. SMC speed control valve; 9. Second connecting piece; 10. Strong clamping cylinder; 11. Cylinder pressing arm; 12. Third connecting piece; 13. Fourth connecting piece; 14. Second gasket; 15. Fifth connecting piece; 16. Sixth connecting piece; 17. Octagonal tube; 18. First insulating pin; 19. Second insulating pin. Detailed implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0022] The present invention provides a technical solution, a general gripper for stud welding without a grounding electrode. Please refer to Figure 1 、 Figure 2 and Figure 3 , including a supporting block 1, a pressing block 2, a pressing arm 3, a spacer block 4, a bushing 5, a first gasket 6, a first connecting piece 7, an SMC speed control valve 8, a second connecting piece 9, a strong clamping cylinder 10, a cylinder pressing arm 11, a third connecting piece 12, a fourth connecting piece 13, a second gasket 14, a fifth connecting piece 15, a sixth connecting piece 16, an octagonal tube 17, a first insulating pin 18 and a second insulating pin 19. The supporting block 1 is arranged at the lower end of the pressing block 2, and the first gasket 6 is arranged between the pressing block 2 and the pressing arm 3.

[0023] Please refer to Figure 1 , the pressing block 2 is fixedly connected to the pressing arm 3 through the second insulating pin 19, and the second insulating pin 19 plays a role in blocking current.

[0024] Please refer to Figure 1 , the supporting block 1 is fixedly connected to the spacer block 4 through the first insulating pin 18, and the first insulating pin 18 plays a role in blocking current.

[0025] Please refer to Figure 1 , a fifth connecting piece 15 is arranged on one side of the lower end of the octagonal tube 17, and the upper end of the octagonal tube 17 is fixedly connected to the second gasket 14 through the fourth connecting piece 13, the first connecting piece 7 and the third connecting piece 12.

[0026] Please refer to Figure 2 , the supporting block 1 is made of copper material, and the supporting block 1 is connected to the ground wire, and the conductivity is increased through the copper material to reduce the virtual soldering rate of the product.

[0027] Please refer to Figure 1, the first gasket 6 is processed according to the pressure block 2 and the pressure arm 3, reducing the weight and space of the pressure block 2 and the pressure arm 3.

[0028] Please refer to Figure 1 , a general gripper for stud welding without a grounding electrode, characterized in that: a dust-proof net is installed inside the octagonal tube 17, and the dust-proof net is fixed to the inner wall of the octagonal tube 17 through a magnetic attraction structure, and the dust and sundries falling into the octagonal tube 17 are collected through the dust-proof net for easy cleaning.

[0029] Working principle of this device: Stud welding makes the other end of the stud contact with the surface of the plate. After power-on to generate an arc, when the contact surface melts, a certain pressure is applied to the stud to form a firmly fixed process method. According to the different welding power supplies used in the welding process, traditional arc stud welding can be divided into two basic methods: ordinary arc stud welding and capacitor energy storage arc stud welding. Stud welding is a method of welding metal studs or other fasteners onto workpieces. There are various methods to achieve stud welding, such as drawn arc stud welding, energy storage stud welding, resistance welding, projection welding, etc. The corresponding welding machines are also different, namely drawn arc stud welding machines, energy storage stud welding machines, resistance welding machines, projection welding machines, etc. The energy storage stud welding machine uses a large-capacity capacitor as the source of welding energy, precisely controls the discharge time through thyristors, and melts the tip of the stud rapidly in the way of instant low voltage - high current, so that the gap between the stud and the working surface is quickly merged, and the stud is firmly welded to the working surface. The whole process lasts about 1 - 10 ms. Characteristics of stud welding: 1. It saves time and cost very much. All structures of stud welding do not require steps such as drilling, punching, threading, riveting, screwing, and finishing. During stud welding, the welding process is short-time, high-current, and with relatively small penetration depth. Therefore, it can be welded to very thin plates. For ceramic ring drawn arc stud welding and short-cycle drawn arc stud welding, the plate thickness can reach 1 mm. Capacitor discharge drawn arc stud welding can reach 0.6 mm, and energy storage stud welding can reach 0.5 mm. The workpiece of stud welding must be welded from one side and can be welded in all positions. With the help of an expander, it can be welded to restricted vertical partitions. Since it is short-time welding and there is little deformation after welding, no trimming is required. Because the welded structure does not need drilling, there will be no leakage. The joints of stud welding can reach very high strength, that is, the joint strength of stud welding is greater than the strength of the stud itself. After welding on plated or high-alloy plates, there is no imprint on the back. The advantage of stud welding compared with other welding methods lies in the welding power. For workpieces in mass production, it can reach 8 - 40 pieces / min (depending on different diameters of studs and different welding powers) within a very short welding time (3 - 980 ms), and the automatic feeding stud welding machine can reach an ultra-high efficiency of 60 pieces / min. Standard studs are of low cost. Stud welding equipment and welding guns have various types, and the purchase cost of the equipment is relatively low. According to the product, it can be made into a multi-station automatic welding machine or a high-precision gantry numerical control automatic welding machine. Stud welding has a high quality reproducibility rate and a low rejection rate.

[0030] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0031] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A universal gripper for stud welding without grounding electrode, comprising a support block (1), a pressure block (2), a pressure arm (3), a cushion block (4), a bushing (5), a first gasket (6), a first connecting piece (7), an SMC speed regulating valve (8), a second connecting piece (9), a strong tightening cylinder (10), a cylinder pressure arm (11), a third connecting piece (12), a fourth connecting piece (13), a second gasket (14), a fifth connecting piece (15), a sixth connecting piece (16), an octagonal tube (17), a first insulating pin (18) and a second insulating pin (19), characterized in that: The support block (1) is arranged at the lower end of the pressing block (2), and the first gasket (6) is arranged between the pressing block (2) and the pressing arm (3).

2. A universal gripper for stud welding without grounding electrode according to claim 1, characterized in that: The pressing block (2) is fixedly connected to the pressing arm (3) via a second insulating pin (19).

3. A universal gripper for stud welding without grounding electrode according to claim 1, characterized in that: The support block (1) is fixedly connected to the cushion block (4) via a first insulating pin (18).

4. A universal gripper for stud welding without grounding electrode according to claim 1, characterized in that: A fifth connecting piece (15) is provided on one side of the lower end of the octagonal tube (17), and the upper end of the octagonal tube (17) is fixedly connected to the second gasket (14) via a fourth connecting piece (13), a first connecting piece (7) and a third connecting piece (12).

5. The universal gripper for stud welding without grounding electrode according to claim 1, characterized in that: The support block (1) is made of copper material, and the support block (1) is connected to a ground wire.

6. The universal gripper for stud welding without grounding electrode according to claim 1, characterized in that: The first gasket (6) is processed according to the pressing block (2) and the pressing arm (3).

7. A universal gripper for stud welding without grounding electrode according to claim 1, characterized in that: A dustproof net is installed inside the octagonal tube (17), and the dustproof net is fixed to the inner wall of the octagonal tube (17) through a magnetic attraction structure.

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