CN104384697A - Suspension type spot welding machine capable of performing delayed pressing on welding spot to maintain cooling crystallization pressure - Google Patents

Abstract

The invention discloses a suspended spot welding machine for delaying pressurizing solder joints to maintain cooling crystallization pressure. A transformer is arranged on the left side of the frame, a water outlet valve is arranged on the right side of the frame, and the lower side of the water outlet valve is There is a water outlet pipe, the left side of the water outlet valve is provided with a water inlet valve, and the lower side of the water inlet valve is provided with a water inlet pipe. On the inlet pipe of the transformer, there is a time-delay pressure regulating valve on the outside of the transformer, a one-way valve is set on the left side of the time-delay pressure regulating valve, a power-off delay solenoid valve is set on the left side of the one-way valve, and the lower end of the auxiliary pipe is connected to Installed on the time-delay pressure regulating valve, and connected downwards to be installed on the welding tongs through the one-way valve and the power-off delay solenoid valve, the invention has simple structure, reasonable design, low processing and production cost, and obvious effect of improving welding quality.

Description

A suspension type spot welding machine that delays pressurizing welding spots to maintain cooling crystallization pressure

technical field

The invention relates to a welding device, in particular to a suspension type spot welding machine which prolongs the time for maintaining welding pressure.

Background technique

Suspension spot welding machine is an important equipment in vehicle processing and production. A complete car body has at least 4,000 welding spots. The quality of welding is directly related to the stability and driving safety of the vehicle. At present, when the spot welding machines sold and used on the market leave the factory, the pneumatic action program has been edited and set. However, in actual operation and use, due to the influence of materials, temperature, equipment and other factors, the aging of the solder joints due to condensation and cooling is not enough, resulting in cracks and shrinkage cavities in the weld joints.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects, to provide a suspension type spot welder that prolongs and maintains the welding pressure, to solve the solder joint cracks and shrinkage phenomena caused by the insufficient condensation and cooling time of the existing welder's solder joints, and to improve the welding performance. The use function and welding quality of the machine meet the design requirements.

The solution of the present invention includes a frame, a hanger, a transformer, a water cooling system and an air system. The water cooling system is composed of inlet and outlet water valves and inlet and outlet pipes. The air circuit system is composed of inlet pressure regulating valve, inlet pipe, solenoid valve, auxiliary pipe and delay pressure regulating valve. Its structural feature is that there is a Transformer, the right side of the frame is provided with a water outlet valve, the lower side of the water outlet valve is provided with a water outlet pipe, the left side of the water outlet valve is provided with a water inlet valve, the lower side of the water inlet valve is provided with a water inlet pipe, and the lower end of the outlet pipe is connected to the installation On the return pipe of the welding tongs, the lower end of the water inlet pipe is connected and installed on the water inlet pipe of the welding tongs. An air filter is arranged on the left side of the water inlet valve, and an air inlet pressure regulating valve is arranged on the upper left side of the air filter. The lower side of the air intake pressure regulating valve is provided with an air intake pipe, the lower end of the air intake pipe is provided with a welder solenoid valve, the air intake pipe is provided with an auxiliary pipe, and the outer side of the transformer is provided with a time-delay pressure regulating valve, and the left side of the time-delay pressure regulating valve is There is a one-way valve on the side, and a power-off delay solenoid valve is set on the left side of the one-way valve. The lower end of the auxiliary pipe is connected to the delay pressure regulating valve, and goes downward The connection is mounted on the welding tongs.

The invention has the advantages of simple structure, reasonable design, low processing and production cost, and obvious effects of delaying maintaining pressure and improving welding quality.

Further detailed description will be given below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is a schematic diagram of the front view structure of the spot welding machine;

Figure 3 is a schematic diagram of the external circuit.

Detailed ways

The left side of the frame 14 shown in Figure 1-2 is provided with a transformer 6, the right side of the frame is provided with a water outlet valve 13, the lower side of the water outlet valve is provided with a water outlet pipe 15, and the left side of the water outlet valve is provided with a water inlet Valve 12, the lower side of water inlet valve is provided with water inlet pipe 16, and the lower end of water outlet pipe is connected and installed on the return pipe of welding tongs, and the lower end of water inlet pipe is connected and installed on the water inlet pipe of welding tongs, and the left side of water inlet valve is provided with There is an air filter 10, the upper left side of the air filter is provided with an air intake pressure regulating valve 7, the lower side of the air intake pressure regulating valve is provided with an air intake pipe 9, and the lower end of the air intake pipe is provided with a welder solenoid valve 11, There is a secondary pipe 5 on the gas pipeline, a time-delay pressure regulating valve 4 is provided on the outside of the transformer, a check valve 3 is provided on the left side of the time-delay pressure regulating valve, and a power-off delay solenoid valve 2 is provided on the left side of the check valve. , the lower end of the auxiliary pipe is connected and installed on the delay pressure regulating valve, and is connected downwards and installed on the welding tongs 1 through the one-way valve and the power-off delay solenoid valve. The upper right side of the intake pressure regulating valve is provided with an external air source Connecting pipe 8, the upper end of frame is provided with suspension ring 18, and the left side of frame is provided with welding tongs hanger 17.

The external circuit shown in Figure 3 is composed of magnetic switches K1, K2, power-off delay relay TA3, intermediate relay KA4, welding machine solenoid valve KA1, and normally closed solenoid valve KA2. Lead a wire to connect to one end of the magnetic switch K1, the other end of the magnetic switch K1 leads to the end of the intermediate relay coil, and a wire from the end of the magnetic switch K2 to connect to one of the connectors at both ends of the solenoid valve circuit of the welding machine. The contact at the other end of the switch K2 is connected to the coil of the power-off delay relay with a wire. Connect one end of the coil of the power-off delay relay to one end of the solenoid valve circuit of the welding machine with a wire, connect one end of the normally open switch of the power-off delay relay to the normally open switch of the intermediate relay, and connect the other end to the port of the normally closed solenoid valve circuit. The main function of the intermediate relay is to assist the operation of the control circuit. The coil of the intermediate relay is connected to the magnetic switch and the power supply of the welding machine to monitor the welding process. Solenoid valve circuit. Solenoid valve KA1 is a welding solenoid valve, which mainly responds to electronic signals and cooperates with the welding tongs to enter and exit air. The magnetic switch K2 and the power-off delay relay coil are connected to the welder solenoid valve KA1. The main function is to provide delay relay coil during welding Power on, the normally closed solenoid valve is connected with the normally open switch of the power-off delay relay, the main function is to signal the normally closed solenoid valve, that is, once the welding is completed, the normally closed solenoid valve KA2 immediately supplies air to the cylinder of the welding tongs to increase the pressure. A secondary pipe is drawn from the intake pipe to connect to one end of the delay pressure regulating valve. The purpose is to adjust the air supply to the welding tongs after the welding is completed, and precisely control the welding air pressure to reach the set pressure value. A secondary pipe led from the intake pipe is connected to one end of the delay pressure regulating valve, and then the other end of the delay pressure regulating valve is connected to a one-way valve to prevent air turbulence. The other end of the one-way valve is connected to a delay solenoid valve to delay When the solenoid valve is connected to the cylinder of the welding tongs, the gas is supplied to the cylinder of the welding tongs.

Claims (3)

1. A suspended spot welding machine for delaying pressurized solder joints to maintain cooling and crystallization pressure, including a frame, a hanger, a transformer, a water cooling system and an air system, and the water cooling system is composed of an inlet and outlet water valve and an inlet and outlet water pipe. The air circuit system is composed of an air inlet pressure regulating valve, an air inlet pipe, a solenoid valve, an auxiliary pipe and a time-delay pressure regulating valve. The water outlet valve (13) is arranged on the right side, the water outlet pipe (15) is arranged on the lower side of the water outlet valve, the water inlet valve (12) is arranged on the left side of the water outlet valve, and the water inlet pipe (16) is arranged on the lower side of the water inlet valve , the lower end of the outlet pipe is connected and installed on the return pipe of the welding tongs, the lower end of the water inlet pipe is connected and installed on the water inlet of the welding tongs, an air filter (10) is arranged on the left side of the water inlet valve, and the air filter There is an air inlet pressure regulating valve (7) on the upper left side, an air inlet pipe (9) is arranged on the lower side of the air inlet pressure regulating valve, a welding solenoid valve (11) is arranged on the lower end of the air inlet pipe, and an auxiliary pipe is arranged on the air inlet pipe (5), the outside of the transformer is provided with a delay pressure regulating valve (4), the left side of the delay pressure regulating valve is provided with a one-way valve (3), and the left side of the one-way valve is provided with a power-off delay solenoid valve ( 2), the lower end of the auxiliary pipe is connected and installed on the delay pressure regulating valve, and is connected downwards and installed on the welding tongs (1) through the one-way valve and the power-off delay solenoid valve. 2. The suspended spot welding machine for delaying pressurized solder joints to maintain cooling and crystallization pressure according to claim 1, characterized in that: the upper right side of the air inlet pressure regulating valve is provided with an external air source connecting pipe (8) , the upper end of the frame is provided with a suspension ring (18), and the left side of the frame is provided with a welding tong hanger (17). 3. A method for connecting an external circuit of a suspension type spot welding machine that delays pressurized solder joints to maintain cooling crystallization pressure, is characterized in that: the external circuit is composed of magnetic switches K1, K2, power-off delay relay TA3, and the middle Relay KA4, welder solenoid valve KA1, and normally closed solenoid valve KA2 are composed. When installing, first lead a wire from the main board of the spot welding machine power supply to one end of the magnetic switch K1, and the other end of the magnetic switch K1 leads to a wire to connect to the intermediate relay coil. One end, a wire drawn from one end of the magnetic switch K2 is connected to one of the joints at both ends of the solenoid valve circuit of the welding machine, and the other end of the magnetic switch K2 is connected to the coil of the power-off delay relay with a wire to delay the power-off delay. One end of the relay coil is connected to one end of the solenoid valve circuit of the welding machine with a wire, one end of the normally open switch of the power-off delay relay is connected to the normally open switch of the intermediate relay, and the other end is connected to the port of the normally closed solenoid valve circuit.