A rapid air pressure switching device for a resistance welding machine

Abstract

This utility model discloses a rapid air pressure switching device for a resistance welding machine, including an air pressure box. The air pressure box is connected to the welding machine via a hose. An air pressure sensor is installed inside the air pressure box, and an air pressure regulating mechanism is connected to the air inlet of the air pressure box. The air pressure regulating mechanism includes an air cylinder, with a piston slidably connected to the inner wall of the air cylinder. One end of the piston is connected to a drive unit. The top of the air cylinder has a first air inlet / outlet and a second air inlet / outlet on its left and right sides, respectively. This invention relates to the field of resistance welding machine technology. By setting up an air pressure regulating mechanism, air can be filled into the air pressure box, and the air pressure inside the air pressure box can be regulated by filling the air pressure box. The amount of air filled can be adjusted over a wide range, thus allowing for a wide range of air pressure regulation inside the air pressure box. An electric push rod drives the piston to reciprocate, and the piston can fill the air pressure box with air during each reciprocation. Furthermore, the electric push rod reciprocates many times per unit time, thereby enabling rapid air pressure regulation inside the air pressure box.

Description

Technical Field

[0001] This utility model relates to the field of resistance welding machine technology, specifically a rapid air pressure switching device for resistance welding machines. Background Technology

[0002] Resistance welding is widely used in the stamping and automotive industries. When resistance welding products, current passes through the copper plate workpiece, generating resistance heating and fusion welding. The copper electrode head frequently contacts the workpiece, causing oxidation and increased resistance, resulting in poor welding effect. Therefore, the electrode head needs to be reground. However, resistance welding machines require a relatively large cylinder pressure (about 0.3-0.4MPa) during normal welding, but only 0.02-0.03MPa is needed when reground the electrode head. Therefore, the air pressure needs to be adjusted.

[0003] Current resistance welding machine air pressure regulation mechanisms mainly obtain different air pressure values ​​by compressing the gas and using different degrees of compression. However, this method has the following shortcomings: when the amount of gas in the air pressure regulation mechanism decreases (such as due to slight leakage), if the piston of the cylinder moves to the maximum limit but has not yet reached the required air pressure value, the piston cannot continue to move, resulting in the failure of the high pressure acquisition function; and the amount of gas in the air pressure regulation mechanism is constant, so its minimum air pressure is fixed and cannot be adjusted, thus limiting the air pressure regulation range. Utility Model Content

[0004] In view of the problems existing in the current resistance welding machine air pressure rapid switching device, this utility model is proposed.

[0005] Therefore, the purpose of this utility model is to provide a rapid gas pressure switching device for resistance welding machines, which solves the problem that the current gas pressure regulation mechanism of resistance welding machines mainly obtains different gas pressure values ​​by compressing the gas and using different degrees of compression. However, this method has the following shortcomings: when the amount of gas in the gas pressure regulation mechanism decreases (such as slight leakage), if the piston of the cylinder moves to the maximum limit value but has not yet reached the required gas pressure value, the piston cannot continue to move, resulting in the failure of the high pressure acquisition function; and the amount of gas in the gas pressure regulation mechanism is constant, so its minimum gas pressure is fixed and cannot be adjusted, thus limiting the gas pressure regulation range.

[0006] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0007] A rapid air pressure switching device for a resistance welding machine includes an air pressure box, the interface of which is connected to the welding machine via a hose, an air pressure sensor is installed inside the air pressure box, and an air pressure regulating mechanism is connected to the air inlet of the air pressure box.

[0008] The air pressure regulating mechanism includes an air cylinder, a piston is slidably connected to the inner wall of the air cylinder, one end of the piston is connected to a drive unit, the top left and right sides of the air cylinder have a first air inlet and outlet and a second air inlet and outlet respectively, the bottom sides of the air cylinder have a third air inlet and outlet and a fourth air inlet and outlet respectively, and a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve are respectively installed on the first air inlet and outlet, the second air inlet and outlet, the third air inlet and outlet and the fourth air inlet and outlet.

[0009] In a preferred embodiment of the resistance welding machine air pressure rapid switching device described in this utility model, the air cylinder is fixedly installed on an L-shaped support plate, a U-shaped bracket is welded to the bottom of the L-shaped support plate, and the air pressure box is installed on the U-shaped bracket by bolts.

[0010] In a preferred embodiment of the rapid air pressure switching device for a resistance welding machine described in this utility model, the driving unit is configured as an electric push rod, one end of which is connected to an L-shaped support plate, and the other end of which is connected to a piston.

[0011] In a preferred embodiment of the rapid air pressure switching device for a resistance welding machine described in this utility model, a support connecting seat is installed on the L-shaped support plate, an electric push rod is inserted into the inner wall of the support connecting seat, and the electric push rod and the support connecting seat are fixed together by bolts.

[0012] In a preferred embodiment of the resistance welding machine air pressure rapid switching device described in this utility model, the third air inlet and the fourth air inlet and the fourth air inlet are connected to a U-shaped pipe, the bottom outlet of the U-shaped pipe is connected to a bridge pipe, and the end of the bridge pipe is connected to the air inlet.

[0013] In a preferred embodiment of the rapid air pressure switching device for a resistance welding machine described in this utility model, a support plate is provided at the bottom of the U-shaped tube, and the two ends of the support plate are connected to the U-shaped bracket.

[0014] Compared with existing technologies:

[0015] 1. By setting up an air pressure regulating mechanism, air can be filled into the air pressure box. By filling the air pressure box, the air pressure inside the air pressure box can be regulated. The amount of air filled can be adjusted over a wide range, thus the air pressure range inside the air pressure box is wide.

[0016] 2. The piston is driven to reciprocate by an electric push rod, and the piston can fill the pressure box with air during each reciprocating motion. The electric push rod makes a large number of reciprocating motions per unit time, which can quickly adjust the air pressure in the pressure box. Attached Figure Description

[0017] Figure 1This is a structural schematic diagram of the present invention;

[0018] Figure 2 A side view of the sealing sleeve provided by this utility model;

[0019] Figure 3 Provided by this utility model Figure 1 A sectional view;

[0020] Figure 4 The figures provided for this utility model.

[0021] In the diagram: 1. Pressure box; 2. Welding machine; 3. Interface; 4. Exhaust port; 41. Fifth solenoid valve; 5. Inlet; 6. U-shaped bracket; 7. Bearing plate; 8. L-shaped support plate; 9. Support connecting seat; 10. Electric push rod; 11. Sealing sleeve; 12. Air cylinder; 13. First air inlet / outlet; 131. Fourth air inlet / outlet; 14. Second air inlet / outlet; 141. Second solenoid valve; 15. Third air inlet / outlet; 151. Fourth air inlet / outlet; 16. Fourth solenoid valve; 161. Bridge pipe; 18. U-shaped pipe; 19. Pressure sensor; 21. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0023] This utility model provides a rapid air pressure switching device for a resistance welding machine. Please refer to [link / reference]. Figure 1-4 The system includes a pressure chamber 1, whose interface 3 is connected to a welding machine 2 via a hose. A pressure sensor 21 is installed inside the pressure chamber 1. The air inlet 5 of the pressure chamber 1 is connected to a pressure regulating mechanism. A one-way valve is installed on the air inlet 5, allowing air to enter the pressure chamber 1 through the air inlet 5, but preventing the gas inside the pressure chamber 1 from escaping through the air inlet 5. The pressure chamber 1 also has an exhaust port 4, on which a fifth solenoid valve 41 is installed.

[0024] The air pressure regulating mechanism includes an air cylinder 12, with a piston slidably connected to the inner wall of the air cylinder 12. One end of the piston is connected to a drive unit. The top left and right sides of the air cylinder 12 have a first air inlet / outlet 13 and a second air inlet / outlet 14, respectively. The bottom sides of the air cylinder 12 have a third air inlet / outlet 15 and a fourth air inlet / outlet 16, respectively. A first solenoid valve 131, a second solenoid valve 141, a third solenoid valve 151, and a fourth solenoid valve 161 are respectively installed on the first air inlet / outlet 13, the second air inlet / outlet 14, the third air inlet / outlet 15, and the fourth air inlet / outlet 16.

[0025] The air cylinder 12 is fixedly installed on the L-shaped support plate 8. A U-shaped bracket 6 is welded to the bottom of the L-shaped support plate 8. The air pressure box 1 is installed on the U-shaped bracket 6 by bolts.

[0026] The drive unit is configured as an electric push rod 10, which is controlled by the control system. One end of the electric push rod 10 is connected to an L-shaped support plate 8. Specifically, a support connecting seat 9 is installed on the L-shaped support plate 8. The electric push rod 10 is inserted into the inner wall of the support connecting seat 9. The electric push rod 10 and the support connecting seat 9 are fixed together by bolts. The other end of the electric push rod 10 is connected to a piston.

[0027] Since the volume of the air cylinder 12 is constant, the amount of gas injected into the pressure chamber 1 and the amount of gas extracted from the pressure chamber 1 are also constant during a single stroke of the piston (either the piston moves from the leftmost to the rightmost or from the rightmost to the leftmost). Furthermore, because the volume of the pressure chamber 1 is constant, the increase or decrease in pressure within the pressure chamber 1 after a single stroke is also constant. Therefore, the control system can adjust the pressure value within the pressure chamber 1 by controlling the number of strokes of the electric push rod 10. The electric push rod 10 is set as a linear reciprocating push-pull rod, with a maximum extension / retraction frequency of 240 times per minute, thus quickly adjusting the pressure value within the pressure chamber 1.

[0028] The third air inlet / outlet 15 and the fourth air inlet / outlet 16 are connected to a U-shaped pipe 19. The bottom outlet of the U-shaped pipe 19 is connected to a bridge pipe 18, and the end of the bridge pipe 18 is connected to the air inlet 5.

[0029] The bottom of the U-shaped tube 19 is provided with a support plate 17, and the two ends of the support plate 17 are connected to the U-shaped bracket 6.

[0030] In practical use:

[0031] Opening the fourth inlet / outlet valve 131, closing the second solenoid valve 141, closing the third solenoid valve 151, and opening the fourth solenoid valve 161 causes the electric push rod 10 to extend, driving the piston to move to the right. This forces air from the air cylinder 12 into the pressure chamber 1 through the fourth inlet / outlet valve 16, while outside air enters the air cylinder 12 through the first inlet / outlet valve 13. Then, closing the fourth inlet / outlet valve 131, opening the second solenoid valve 141, opening the third solenoid valve 151, and closing the fourth solenoid valve 161 causes the electric push rod 10 to retract, driving the piston to move to the left. This forces air from the air cylinder 12 into the pressure chamber 1 through the third inlet / outlet valve 15. Therefore, extending or retracting the electric push rod 10 increases the pressure in the pressure chamber 1. To reduce the pressure in the pressure chamber 1, opening the fifth solenoid valve 41 allows air to be discharged from the exhaust port 4.

[0032] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A rapid air pressure switching device for a resistance spot welding machine, comprising an air pressure box (1), wherein the interface (3) of the air pressure box (1) is connected to the spot welding machine (2) via a flexible hose, characterized in that: A pressure sensor (21) is installed inside the pressure box (1), and a pressure regulating mechanism is connected to the air inlet (5) of the pressure box (1). The air pressure regulating mechanism includes an air cylinder (12), a piston is slidably connected to the inner wall of the air cylinder (12), and a drive unit is connected to one end of the piston. The top left and right sides of the air cylinder (12) have a first air inlet / outlet (13) and a second air inlet / outlet (14) respectively. The bottom sides of the air cylinder (12) have a third air inlet / outlet (15) and a fourth air inlet / outlet (16) respectively. A first solenoid valve (131), a second solenoid valve (141), a third solenoid valve (151) and a fourth solenoid valve (161) are respectively installed on the first air inlet / outlet (13), the second air inlet / outlet (14), the third air inlet / outlet (15) and the fourth air inlet / outlet (16).

2. The rapid air pressure switching device for a resistance welding machine according to claim 1, characterized in that, The air cylinder (12) is fixedly installed on the L-shaped support plate (8), and a U-shaped bracket (6) is welded to the bottom of the L-shaped support plate (8). The air pressure box (1) is installed on the U-shaped bracket (6) by bolts.

3. The rapid air pressure switching device for a resistance welding machine according to claim 2, characterized in that, The drive unit is configured as an electric push rod (10), one end of which is connected to an L-shaped support plate (8), and the other end of which is connected to a piston.

4. The rapid air pressure switching device for a resistance welding machine according to claim 3, characterized in that, A support connecting seat (9) is installed on the L-shaped support plate (8). An electric push rod (10) is inserted into the inner wall of the support connecting seat (9). The electric push rod (10) and the support connecting seat (9) are fixed together by bolts.

5. The rapid air pressure switching device for a resistance welding machine according to claim 2, characterized in that, The third air inlet / outlet (15) and the fourth air inlet / outlet (16) are connected to a U-shaped pipe (19). The bottom outlet of the U-shaped pipe (19) is connected to a bridge pipe (18). The end of the bridge pipe (18) is connected to the air inlet (5).

6. The rapid air pressure switching device for a resistance welding machine according to claim 5, characterized in that, The bottom of the U-shaped tube (19) is provided with a support plate (17), and the two ends of the support plate (17) are connected to the U-shaped bracket (6).

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