Pneumatic telescopic positioning pin projection welding lower electrode

Abstract

The utility model relates to the field of nut projection welding, in particular to a pneumatic telescopic positioning pin projection welding lower electrode, which is characterized in that a gas path system and a water path system are respectively arranged in an electrode holder, an electrode cap is mounted at the top of the electrode holder, and a pneumatic positioning pin is movably arranged in the electrode cap; the three-position five-way electromagnetic valve is connected with the gas path system, and the pneumatic positioning pin reciprocates through the gas path system; and the water cooling ring is arranged on the electrode holder and is circularly cooled through the water path system. According to the utility model, the cooling of the device can be realized through the arrangement of the water path system, and the ejection and withdrawing of the pneumatic positioning pin can be pneumatically controlled by the electromagnetic valve through the arrangement of the air path system, so that the problem that a workpiece is clamped after the welding of the lower electrode of the positioning pin can be avoided, and the automatic grinding problem of the electrode with the positioning pin can be solved; in addition, air can be blown to the threaded hole during welding, and the problem of bolt trafficability caused by welding spatter and protruding point extrudate adhering to threads is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nut projection welding technical field especially relates to a kind of electrode of pneumatic telescopic positioning pin projection welding. BACKGROUND

[0002] The lower electrode of nut projection welding is provided with positioning pin, to position the position of mounting hole and nut thread hole on plate workpiece. The traditional nut projection welding electrode adopts the form of spring plus positioning pin, uses the tension of spring to eject positioning pin, and the positioning pin is also retracted when spring is compressed under the pressure of upper electrode during welding.

[0003] The traditional electrode positioning pin is easily stuck on positioning pin and difficult to unload under the condition that the mounting hole of welded plate and the size of positioning pin are similar, plus the unstable factors of workpiece welding deformation and positioning pin spring tension. Especially in some automatic nut projection welding application scenarios, the probability of material jamming is very high when a workpiece is fed and welded with multiple nuts under multiple lower electrode positions.

[0004] And the traditional electrode positioning pin type is in the ejecting position in the natural state, cannot automatically grind the plane of welding electrode, and is not conducive to the automation of projection welding equipment. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the shortcomings in the prior art, and provides a kind of electrode of pneumatic telescopic positioning pin projection welding.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A kind of electrode of pneumatic telescopic positioning pin projection welding, including electrode seat, gas circuit system and water circuit system are respectively arranged in the electrode seat, electrode cap is installed on the top of electrode seat, and pneumatic positioning pin is movably arranged in electrode cap;The three-position five-way electromagnetic valve is connected with gas circuit system, and pneumatic positioning pin reciprocates through gas circuit system;Water-cooling ring is opened in electrode seat, and water-cooling ring is circulated cooled by water circuit system.

[0008] In addition, preferably, the inside of the electrode seat is movably provided with a piston, a cavity is formed in the electrode cap corresponding to the pneumatic positioning pin, and the pneumatic positioning pin is installed on the top of the piston through a positioning pin connecting bolt.

[0009] In addition, preferably, the top of the piston is provided with a positioning pin sealing ring at the position in contact with the pneumatic positioning pin, and the outside of the piston is provided with a piston sealing ring.

[0010] In addition, preferably, the electrode seat is provided with a retraction air passage and an ejection air passage corresponding to the piston, the end of the retraction air passage is provided with a retraction air passage opening, the end of the ejection air passage is provided with an ejection air passage opening, and the retraction air passage opening and the ejection air passage opening are communicated with the gas circuit system.

[0011] In addition, preferably, the electrode seat is provided with a retraction air passage and an ejection air passage corresponding to the piston, the end of the retraction air passage is provided with a retraction air passage opening, the end of the ejection air passage is provided with an ejection air passage opening, and the retraction air passage opening and the ejection air passage opening are communicated with the gas circuit system.

[0012] In addition, preferably, the electrode seat is provided with a retraction air passage and an ejection air passage corresponding to the piston, the end of the retraction air passage is provided with a retraction air passage opening, the end of the ejection air passage is provided with an ejection air passage opening, and the retraction air passage opening and the ejection air passage opening are communicated with the gas circuit system.

[0013] In addition, preferably, the electrode seat is provided with a retraction air passage and an ejection air passage corresponding to the piston, the end of the retraction air passage is provided with a retraction air passage opening, the end of the ejection air passage is provided with an ejection air passage opening, and the retraction air passage opening and the ejection air passage opening are communicated with the gas circuit system.

[0014] In addition, preferably, the electrode seat is provided with a retraction air passage and an ejection air passage corresponding to the piston, the end of the retraction air passage is provided with a retraction air passage opening, the end of the ejection air passage is provided with an ejection air passage opening, and the retraction air passage opening and the ejection air passage opening are communicated with the gas circuit system.

[0015] In addition, preferably, the electrode seat is provided with a retraction air passage and an ejection air passage corresponding to the piston, the end of the retraction air passage is provided with a retraction air passage opening, the end of the ejection air passage is provided with an ejection air passage opening, and the retraction air passage opening and the ejection air passage opening are communicated with the gas circuit system.

[0016] The beneficial effects of the present application are as follows: the water circuit system can realize the cooling of the device, the gas circuit system can control the ejection and retraction of the electromagnetic valve pneumatic positioning pin, which can not only avoid the problem of the positioning pin being stuck in the workpiece after the lower electrode is welded, but also solve the problem of automatic grinding of the electrode with the positioning pin, and the gas can be blown into the threaded hole during welding, thereby solving the problem of bolt passability caused by the adhesion of welding splashes and convex point extrusions on the threads. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 The structure diagram of the electrode is provided.

[0018] Fig. 2 The structure diagram of the electrode is provided.

[0019] Fig. 3 The structure diagram of the electrode is provided.

[0020] In the figure: 1 pneumatic positioning pin, 2 electrode cap, 3 positioning pin sealing ring, 4 back-pumping air passage, 5 back-pumping air passage port, 6 back-pumping air passage throttle, 7 blowing pressure gauge, 8 shuttle valve, 9 blowing pressure reducing valve, 10 piston, 11 piston sealing ring, 12 positioning pin connecting bolt, 13 electrode holder, 14 ejection air passage, 15 ejection air passage throttle, 16 ejection air passage port, 17 three-position five-way electromagnetic valve, 18 upper waterway sealing ring, 19 electrode holder steel sleeve, 20 water inlet tank, 21 water inlet channel two, 22 water inlet channel one, 23 water inlet port, 24 water-cooling ring, 25 water outlet tank, 26 water outlet channel two, 27 lower waterway sealing ring, 28 water outlet channel one, 29 water outlet port. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0022] Reference Figs. 1-3 A pneumatic telescopic positioning pin projection welding lower electrode comprises an electrode holder 13, the electrode holder 13 is provided with a gas circuit system and a water circuit system respectively, the top of the electrode holder 13 is provided with an electrode cap 2, and the electrode cap 2 is movably provided with a pneumatic positioning pin 1. A three-position five-way electromagnetic valve 17 is connected with the gas circuit system, and the pneumatic positioning pin 1 reciprocates through the gas circuit system. A water-cooling ring 24 is arranged on the electrode holder 13, and the water-cooling ring 24 is circulated and cooled through the water circuit system.

[0023] The inside of the electrode holder 13 is movably provided with a piston 10, the inside of the electrode cap 2 is correspondingly provided with a cavity adapted to the pneumatic positioning pin 1, and the pneumatic positioning pin 1 is installed on the top of the piston 10 through a positioning pin connecting bolt 12. Under the action of the gas circuit system, the piston 10 can move up and down in the cavity in the electrode holder 13, and the pneumatic positioning pin 1 also moves up and down with the piston 10. When loading, the pneumatic positioning pin 1 is ejected, and after welding, the pneumatic positioning pin 1 is retracted to unload.

[0024] The top of the piston 10 is provided with a positioning pin sealing ring 3 at the position in contact with the pneumatic positioning pin 1, and the outside of the piston 10 is provided with a piston sealing ring 11. The connection between the pneumatic positioning pin 1 and the piston 10 is padded with the positioning pin sealing ring 3 to prevent air from leaking between the upper and lower cavities of the piston 10. The piston 10 is provided with the piston sealing ring 11 to ensure the airtightness of the two cavities.

[0025] The electrode seat 13 is provided with a back-pulling air channel 4 and a ejection air channel 14 corresponding to the piston 10, and the end of the back-pulling air channel 4 is provided with a back-pulling air channel opening 5, and the end of the ejection air channel 14 is provided with an ejection air channel opening 16, and the back-pulling air channel opening 5 and the ejection air channel opening 16 are in communication with the gas circuit system.

[0026] The back-pulling air channel opening 5 and the ejection air channel opening 16 are respectively provided with a back-pulling air channel throttle valve 6 and an ejection air channel throttle valve 15, and the gas circuit system is further provided with a blowing pressure gauge 7, a shuttle valve 8 and a blowing pressure reducing valve 9.

[0027] The gas circuit system is provided with a main circuit and a branch circuit, and the back-pulling air channel opening 5, the shuttle valve 8 and the ejection air channel opening 16 are arranged in the overlapping section of the main circuit and the branch circuit, the main circuit is provided with a three-position five-way electromagnetic valve 17, and the branch circuit is provided with the blowing pressure gauge 7 and the blowing pressure reducing valve 9.

[0028] The electrode seat 13 is provided with an electrode seat steel sleeve 19, and the upper and lower sides of the electrode seat steel sleeve 19 are respectively provided with a waterway upper sealing ring 18 and a waterway lower sealing ring 27.

[0029] The electrode seat 13 is provided with a water inlet groove 20, a water inlet channel two 21, a water inlet channel one 22 and a water inlet 23 on one side, and the other side of the electrode seat 13 is symmetrically provided with a water outlet groove 25, a water outlet channel two 26, a water outlet channel one 28 and a water outlet 29.

[0030] The top of the water inlet groove 20 and the water outlet groove 25 is in communication with the water cooling ring 24, and the water inlet 23 and the water outlet 29 are provided with internal threads matched with water pipes. In order to ensure the normal operation of the cooling water in the water groove and the water cooling ring 24, the electrode seat 13 is sleeved with the electrode seat steel sleeve 19, and the upper and lower ends are respectively provided with the waterway upper sealing ring 18 and the waterway lower sealing ring 27 to ensure sealing and prevent water leakage.

[0031] In this embodiment, the back-pulling air channel 4 and the back-pulling air channel opening 5 in the electrode seat 13 are connected, and the ejection air channel 14 and the ejection air channel opening 16 are connected. When the air pressure of the back-pulling air channel opening 5 is greater than that of the ejection air channel opening 16, the pressure of the upper cavity of the piston 10 is greater than that of the lower cavity, and the piston 10 moves downward with the gas dynamic positioning pin 1; when the air pressure of the ejection air channel opening 16 is greater than that of the back-pulling air channel opening 5, the pressure of the lower cavity of the piston 10 is greater than that of the upper cavity, and the piston 10 moves upward with the gas dynamic positioning pin 1.

[0032] Further, the back-pulling air channel opening 5 and the ejection air channel opening 16 are respectively provided with a back-pulling air channel throttle valve 6 and an ejection air channel throttle valve 15, which can be used to adjust the gas flow, so as to adjust the back-pulling and ejection speed of the gas dynamic positioning pin 1.

[0033] Further, by the setting of the blow pressure gauge 7, shuttle valve 8 and blow pressure reducing valve 9, when the ejector pin 1 is ejected, a branch of the gas flow to the ejector port 16 is divided, the gas flow is reduced by the blow pressure reducing valve 9, the pressure is displayed by the blow pressure gauge 7, and the shuttle valve 8 controls a small gas pressure to flow into the upper cavity of the piston 10 through the back suction port 5 and back suction channel 4. During the welding process, the upper electrode will have a small stroke of pressing down on the ejector pin 1, at this time, the gas in the upper cavity of the piston 10 can flow out through the gap between the ejector pin 1 and the electrode cap 2, and this gas can blow away the metal spatter and metal extrusion generated during welding, thereby avoiding the problem of thread passability caused by the adhesion of the metal spatter and metal extrusion on the threads of the projection nut.

[0034] The three-position five-way electromagnetic valve 17 is a control device cooperating with the entire gas circuit system and external equipment, and is connected as shown in the figure. The three-position five-way electromagnetic valve 17 is provided with five channels, and the connection between the channels is as follows: channel one is connected to the air inlet; channel three and channel five are connected to the exhaust port and connected to the muffler; channel two is connected to the ejector port 16, and a branch is divided to the blow pressure reducing valve 9 for blowing during welding; and channel four is connected to the back suction port 5.

[0035] When the three-position five-way electromagnetic valve 17 is not powered, it is in the middle position, the air source does not enter, and the two gas channels are connected to the exhaust port, and the mechanism is in a natural state.

[0036] When the left electromagnetic valve of the three-position five-way electromagnetic valve 17 is powered, channel four and channel one are connected to the air inlet, channel two and channel three are connected to the exhaust port and the muffler, at this time, the shuttle valve 8 is connected to the left side, the air pressure passes through the shuttle valve 8 and the back suction channel throttle 6, enters the upper cavity of the piston 10 through the back suction port 5 and the back suction channel 4, and at the same time, the lower cavity of the piston 10 flows through the ejector channel throttle 15 to the exhaust port connected to the muffler, at this time, the ejector pin 1 moves downward with the piston 10.

[0037] When the right electromagnetic valve of the three-position five-way electromagnetic valve 17 is powered, channel two and channel one are connected to the air inlet, channel four and channel five are connected to the exhaust port and the muffler, at this time, one way of the air source passes through the ejector channel throttle 15, enters the lower cavity of the piston 10 through the ejector port 16 and the ejector channel 14, and the other way passes through the blow pressure reducing valve 9, flows through the blow pressure gauge 7, the shuttle valve 8, the back suction port 5, the back suction channel 4, and enters the upper cavity of the piston 10, at this time, the ejector pin 1 moves upward with the piston 10, and has the function of blowing.

[0038] Further, the waterway system comprises the water inlet 23 and the water outlet 29, water flows into the water inlet 23, sequentially flows through the water inlet channel one 22, the water inlet channel two 21, the water inlet tank 20, the water cooling ring 24, the water outlet tank 25, the water outlet channel two 26, the water outlet channel one 28 and then flows out of the water outlet 29, thereby forming a loop.

[0039] Further, the lower end of the cylindrical electrode cap 2 is externally threaded, and is screwed onto the electrode holder 13, so that the lower end surface of the boss is in full contact with the upper end surface of the electrode holder 13, thereby conducting the large current from the electrode holder 13 to the workpiece above, so that the workpiece is welded into shape. The electrode cap 2 directly contacts the workpiece and participates in welding, although the waterway system cools the electrode, but under the action of long-term large current and large pressure, the end surface of the electrode cap 2 is prone to deformation and wear, which affects the appearance and welding quality of the workpiece. The traditional electrode cap needs to be manually replaced regularly due to the positioning pin cannot be retracted, while the new pneumatic positioning pin 1 can be retracted by controlling the gas circuit system, so that the end surface of the electrode cap 2 can be automatically ground by the automatic grinding equipment, which is beneficial to the automation of the equipment and improves the production efficiency.

[0040] In the utility model, the waterway system can cool the device, the gas circuit system can control the ejection and retraction of the pneumatic positioning pin 1, which can not only avoid the problem that the positioning pin is stuck in the workpiece after welding, but also solve the problem of automatic grinding of the electrode with the positioning pin, and the threaded hole can be blown during welding, thereby solving the problem of bolt passability caused by the adhesion of welding spatter and protruding material on the thread.

[0041] The above is only a preferred embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A pneumatic telescopic positioning pin projection welding lower electrode, comprising: an electrode seat (13) in which a gas circuit system and a water circuit system are respectively arranged, a top of the electrode seat (13) is provided with an electrode cap (2), and a pneumatic positioning pin (1) is movably arranged in the electrode cap (2); a three-position five-way electromagnetic valve (17) connected with the gas circuit system, and the pneumatic positioning pin (1) reciprocates through the gas circuit system; a water-cooling ring (24) arranged on the electrode seat (13) and circulated and cooled by the water circuit system.

2. A gas-damped telescopic positioning pin projection weld lower electrode according to claim 1, characterized in that A piston (10) is movably arranged in the electrode seat (13) in the vertical direction, a cavity corresponding to the pneumatic positioning pin (1) is arranged in the electrode cap (2), and the pneumatic positioning pin (1) is arranged on the top of the piston (10) through a positioning pin connecting bolt (12).

3. A gas-damped retracting dowel pin projection weld lower electrode according to claim 2, wherein, A positioning pin sealing ring (3) is arranged at a position where the top of the piston (10) contacts the pneumatic positioning pin (1), and a piston sealing ring (11) is arranged on the outer side of the piston (10).

4. A gas-actuated telescopic positioning pin projection welding lower electrode according to claim 1, characterized in that A retraction air channel (4) and an ejection air channel (14) corresponding to the piston (10) are arranged in the electrode seat (13), an end of the retraction air channel (4) is provided with a retraction air channel opening (5), an end of the ejection air channel (14) is provided with an ejection air channel opening (16), and the retraction air channel opening (5) and the ejection air channel opening (16) are both communicated with the gas circuit system.

5. A gas-damped telescopic positioning pin projection weld lower electrode according to claim 4, characterized in that A retraction air channel throttle valve (6) and an ejection air channel throttle valve (15) are arranged on the outer side of the retraction air channel opening (5) and the ejection air channel opening (16) in the gas circuit system, and the gas circuit system is further provided with a blowing pressure gauge (7), a shuttle valve (8) and a blowing pressure reducing valve (9).

6. A gas-damped retracting dowel pin projection weld lower electrode as defined in claim 5 wherein, The gas circuit system is provided with a main circuit and a branch circuit, the retraction air channel opening (5), the shuttle valve (8) and the ejection air channel opening (16) are arranged in the overlapping section of the main circuit and the branch circuit, the three-position five-way electromagnetic valve (17) is arranged in the main circuit, and the blowing pressure gauge (7) and the blowing pressure reducing valve (9) are arranged in the branch circuit.

7. A gas-damped retracting dowel pin projection weld lower electrode as defined in claim 1 wherein, An electrode seat steel sleeve (19) is arranged on the electrode seat (13), and a water circuit upper sealing ring (18) and a water circuit lower sealing ring (27) are arranged on the upper and lower sides of the electrode seat steel sleeve (19).

8. A gas-dynamic telescopic positioning pin projection welding lower electrode according to claim 1, characterized in that, A water inlet groove (20), a water inlet channel two (21), a water inlet channel one (22) and a water inlet (23) are arranged on one side of the electrode seat (13), and a water outlet groove (25), a water outlet channel two (26), a water outlet channel one (28) and a water outlet (29) are symmetrically arranged on the other side of the electrode seat (13).

9. A gas-damped retracting dowel pin projection weld lower electrode as defined in claim 8 wherein, The top of the water inlet groove (20) and the water outlet groove (25) is communicated with the water-cooling ring (24), and the water inlet (23) and the water outlet (29) are both provided with an internal thread matched with a water pipe.

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