A welding device for connecting electrical engineering wires

Abstract

A welding device for connecting electrical engineering wires, the device has a handle, a power socket is fixed at the end of the handle, and the front end of the handle is connected to a thermostat, the front end of the thermostat is fixed with a U-shaped bracket through a short tube, and the U-shaped bracket is connected to a tin pot with a heating element. The power switch button and the temperature control knob of the temperature control circuit extend outside the panel of the thermostat. The temperature control circuit is composed of a switch k1, a bridge rectifier, a unidirectional thyristor SCR, a sliding rheostat RP, a resistor R1, a diode D5, a resistor R2 and a capacitor C. The tin pot is made of titanium alloy, and a layer of mica sheet and a heating resistance wire are wrapped around and on the bottom of the tin pot. The outer layer of the heating resistance wire is wrapped with a layer of insulating mica sheet and a metal protective cover. The beneficial effect of the present invention is: avoiding the open flame operation mode, the heating temperature of the tin pot can be controlled. The quality of wire welding and the safety of operation are improved.

Description

Technical Field

[0001] The invention relates to a welding device, in particular to a welding device for connecting electrical engineering wires. Background Art

[0002] When conducting wire connection operations in electrical engineering, in order to ensure the quality of wire connection, it is usually necessary to tin the wound wires. The traditional method of tinning is to put the solder bar in a tin pot, heat the tin pot with a blowtorch, insert the wire joint into the tin pot, and tin the wire joint. This welding method has two disadvantages: first, the use of a blowtorch open flame is very likely to cause a fire, posing a serious safety hazard; second, the temperature of the tin pot cannot be accurately controlled when heating the tin pot with a blowtorch. If the temperature of the tin pot is too low, the tinning is uneven, and if the temperature is too high, the tinning is not full.

[0003] In order to solve the problem of open flame operation with a blowtorch, our company invented a device for heating wire solder with an electric heating tube in 2009 (Chinese patent: ZL 200920247935.4), which uses an electric heating tube to heat the solder bar, eliminating the fire hazard caused by open flame operation. However, this patented product still has two defects: first, the heating tube has a small diameter, which is not easy to operate during tinning and soldering, resulting in insufficient soldering; second, the soldering temperature cannot be accurately controlled. Summary of the invention

[0004] The purpose of the present invention is to provide a welding device for connecting electrical engineering wires, which not only has a large-caliber tin pot, but also can control the heating temperature of the tin pot to solve the shortcomings of the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A welding device for connecting electrical engineering wires, comprising a handle and a heating device installed at the front end of the handle, characterized in that a power socket is fixed at the end of the handle, and the front end of the handle is connected to a thermostat, the front end of the thermostat is fixed with a U-shaped bracket through a short tube, and the U-shaped bracket is connected to a tin pot with a heating element.

[0007] The power socket arranged at the end of the handle is a single-phase power socket with a protective ground socket, and the protective ground socket and the two power sockets are arranged in a herringbone shape.

[0008] The temperature controller has a square insulating shell, the rear of which is connected to the handle and the front of which is connected to the U-shaped bracket. A temperature control circuit is installed in the square insulating shell, and a power switch button and a temperature control knob of the temperature control circuit extend beyond the panel of the square insulating shell.

[0009] The temperature control circuit is composed of a switch k1, a bridge rectifier, a thyristor SCR, a sliding rheostat RP, a resistor R1, a diode D5, a resistor R2 and a capacitor C. The input end of the bridge rectifier is connected to a ~220V single-phase power supply through the switch K1, the positive electrode of the output end of the bridge rectifier is connected to one end of the heating resistor, the other end of the heating resistor is connected to one end of the sliding rheostat RP and the sliding end is connected to the anode of the thyristor SCR, the other end of the sliding rheostat RP is connected to the connection between the resistor R2 and the capacitor C through the resistor R1, the other end of the resistor R2 is connected to the control electrode of the thyristor SCR through a diode D5, the cathode of the thyristor SCR is connected to the negative electrode of the output end of the bridge rectifier, and the other end of the capacitor C is also connected to the negative electrode of the output end of the bridge rectifier.

[0010] The tin pot with a heating element is made of a titanium alloy and is wrapped with a layer of mica sheets around and on the bottom of the tin pot, and then wrapped with a layer of heating resistance wire with the mica sheets as a supporting frame. The lead wire of the resistance wire is covered with an insulating porcelain tube and connected to the temperature control circuit along an arm of the U-shaped bracket. The outer layer of the heating resistance wire is further wrapped with a layer of insulating mica sheets and a metal protective cover. The outside of the metal protective cover is tightly fixed to the tin pot with a metal belt, bolts and nuts.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The wire welding device adopts electric heating, avoiding open flame operation and greatly improving the safety performance of wire welding operation.

[0013] 2. The handle and the power cord of the wire welding device are connected by a plug and socket, which is convenient for separation of the power cord from the device and convenient for mobile operation.

[0014] 3. The bottom and side walls of the tin pot are heated at the same time, the heat is even, and the solder bar melts faster.

[0015] 4. The device is equipped with a temperature control device to solve the problem that the temperature of the tin pot heated by a blowtorch cannot be accurately controlled, thus ensuring the quality of tinning of the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the wire welding device of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the insulating mica sheet outside the tin pot.

[0018] Figure 3 It is a schematic diagram of the temperature control circuit.

[0019] In the figure: 1. Power socket; 2. Handle; 3. Temperature control device; 4. Switch; 5. Temperature control knob; 6. Short tube; 7. Positive pole of resistance wire and its insulating sleeve; 8. Negative pole of resistance wire and its insulating sleeve; 9. U-shaped bracket; 10. Bolt; 11. Nut; 12. Tin pot. DETAILED DESCRIPTION

[0020] The specific structure of the wire welding device of the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1 FIG. 1 is a schematic diagram of the overall structure of the wire welding device of the present invention.

[0022] The wire welding device has a handle 2, a power socket 1 is fixed at the end of the handle 2, and a thermostat 3 is connected to the front end of the handle 2. A short tube 6 is fixed to the front end of the thermostat 3, and a U-shaped bracket 9 is fixed to the short tube 6. The U-shaped bracket 9 is connected to a tin pot 12 with a heating element. The power socket 1 arranged at the end of the handle 2 is a single-phase power socket with a protective ground socket, and the protective ground socket and the two power sockets are arranged in a herringbone shape. The thermostat 3 has a square insulating shell, the rear part of which is connected to the handle 2, and the front part is connected to the U-shaped bracket 9 through the short tube 6. The square insulating shell is equipped with a temperature control circuit, and the power switch button 4 and the temperature control knob 5 of the temperature control circuit extend outside the panel of the square insulating shell.

[0023] like Figure 3 As shown, the temperature control circuit consists of a switch K1, a bridge rectifier, a thyristor SCR, a sliding resistor RP, a resistor R1, a diode D5, a resistor R2 and a capacitor C. The input end of the bridge rectifier is connected to a ~220V single-phase power supply through the switch K1, the positive electrode of the output end of the bridge rectifier is connected to one end of the heating resistor, the other end of the heating resistor is connected to one end of the sliding resistor RP and the sliding end and the anode of the thyristor SCR, the other end of the sliding resistor RP is connected to the connection between the resistor R2 and the capacitor C through the resistor R1, the other end of the resistor R2 is connected to the control electrode of the thyristor SCR through a diode D5, the cathode of the thyristor SCR is connected to the negative electrode of the output end of the bridge rectifier, and the other end of the capacitor C is also connected to the negative electrode of the output end of the bridge rectifier.

[0024] The solder pot 12 with heating element is made of a titanium alloy and is covered with a layer of mica sheet around and on the bottom of the solder pot (see Figure 2), and then wrapped with a layer of heating resistance wire with mica sheet as the supporting skeleton, the positive electrode 7 of the resistance wire and its insulating sleeve and the negative electrode 8 of the resistance wire and its insulating sleeve are connected to the temperature control circuit along an arm of the U-shaped bracket 9, the outer layer of the heating resistance wire is wrapped with a layer of insulating mica sheet and a metal protective cover, and the outside of the metal protective cover is tightly fixed to the tin pot 12 with a metal belt and bolts 10 and nuts 11.

[0025] The working principle of the temperature control circuit is that the AC ~220V mains electricity becomes pulsating DC after passing through the bridge rectifier, and the pulsating DC charges the capacitor C through RP and R1. When the voltage across C reaches the threshold voltage of the diode D5, the diode D5 is turned on, and then the control electrode of the unidirectional thyristor SCR is triggered to turn it on. Adjusting RP can change the charging time of the power supply to the capacitor C, that is, change the conduction angle of the thyristor, so that the heating temperature of the device changes accordingly.

[0026] The tin pot is made of titanium alloy and has the characteristics of corrosion resistance, acid resistance, and non-stick tin. Its length, width, and height are 59mm, 59mm, and 70mm respectively.

[0027] The working process of the wire welding device is as follows: connect the external power cord and plug to the power socket 1, press the button 4 of the power switch K1 to turn on the power, adjust the temperature control knob 5 to 250 degrees Celsius, and melt the solder bar in the solder pot 12. After the solder bar is melted, turn off the power switch K1, unplug the external power plug, and tin the wound wire joint.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The wire welding device adopts electric heating, avoiding open flame operation and greatly improving the safety performance of wire welding operation.

[0030] 2. The handle and the power cord of the wire welding device are connected by a plug and socket, which is convenient for separation of the power cord from the device and convenient for mobile operation.

[0031] 3. The bottom and side walls of the tin pot are heated at the same time, the heat is even, and the solder bar melts faster.

[0032] 4. The device is equipped with a temperature control device to solve the problem that the temperature of the tin pot heated by a blowtorch cannot be accurately controlled, thus ensuring the quality of tinning of the wire.

Claims

1. A welding device for connecting electrical engineering wires, comprising a handle and a heating device installed at the front end of the handle, characterized in that: A power socket is fixed at the end of the handle, and a thermostat is connected to the front end of the handle. A U-shaped rod is fixed to the front end of the thermostat through a short tube, and the U-shaped rod is connected to a tin pot with a heating element. The thermostat has a square insulating shell, the rear of which is connected to the handle, and the front of which is connected to the U-shaped rod. A temperature control circuit is installed in the square insulating shell, and a power switch button and a temperature control knob of the temperature control circuit extend out of the panel of the square insulating shell. The temperature control circuit is composed of a switch k1, a bridge rectifier, a thyristor SCR, a sliding resistor RP, a resistor R1, a diode D5, a resistor R2 and a capacitor C. The input end of the bridge rectifier is connected to a ~220V single-phase power supply through the switch K1, the positive electrode of the output end of the bridge rectifier is connected to one end of the heating resistor wire, the other end of the heating resistor wire is connected to one end of the sliding resistor RP and the sliding end is connected to the anode of the thyristor SCR, the other end of the sliding resistor RP is connected to the connection between the resistor R2 and the capacitor C through the resistor R1, the other end of the resistor R2 is connected to the control electrode of the thyristor SCR through a diode D5, the cathode of the thyristor SCR is connected to the negative electrode of the output end of the bridge rectifier, and the other end of the capacitor C is also connected to the negative electrode of the output end of the bridge rectifier; The tin pot with a heating element is made of a titanium alloy and is wrapped with a layer of mica sheets around and on the bottom of the tin pot, and then wrapped with a layer of heating resistance wire with the mica sheets as a supporting frame. The lead wire of the resistance wire is covered with an insulating porcelain tube and connected to the temperature control circuit along an arm of the U-shaped rod. The outer layer of the heating resistance wire is further wrapped with a layer of insulating mica sheets and a metal protective cover. The outside of the metal protective cover is tightly fixed to the tin pot with a metal belt, bolts and nuts.

2. A welding device for connecting electrical engineering wires according to claim 1, characterized in that: The power socket arranged at the end of the handle is a single-phase power socket with a protective ground socket, and the protective ground socket and the two power sockets are arranged in a herringbone shape.

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