Device for projection welding of nut on automobile part

Abstract

The utility model relates to a device for projection welding of a nut on an automobile part. The device comprises an upper electrode, a lower electrode, a sensor and an MCU micro-control unit. The lower electrode comprises an electrode worm and an electrode holder connected to the electrode worm, the electrode holder is composed of an electrode cover and a positioning pin, a positioning pin hole is formed in the electrode cover, the positioning pin is arranged in the positioning pin hole through a compression spring, and the electrode cover is electrically connected with the electrode worm; the sensor is mounted at the bottom of the lower electrode; the detection end of the sensor is arranged on the stroke of the positioning pin; the information output end of the sensor is connected with the information input end of the MCU; and the control end of the MCU micro-control unit is connected with the discharge control end of the upper electrode. The utility model can effectively prevent the product from being scrapped, reduce the loss and improve the efficiency.

Description

Technical Field

[0001] The utility model relates to a device for projection welding nuts on automobile parts. Background Art

[0002] During the automotive parts production process, nuts are often welded to the workpiece. During the nut welding cycle, the workpiece and nut are first placed on the dowel pins. The spot welder is then started, and the upper electrode descends, pressing the nut against the lower electrode of the spot welder, which then discharges and welds.

[0003] In order to automate the entire welding process from nut delivery to welding machine, and to easily connect the conveyor and welding machine to the production line, it is necessary to solve whether the nut delivery or placement status meets the welding requirements. For example, when the nut enters the welding position, the nut may be placed upside down, placed incorrectly vertically, or placed incorrectly horizontally, which will affect the welding quality and even result in defective or scrap products. Summary of the Invention

[0004] The utility model aims to provide a device for projection welding nuts on automobile parts, which can realize correct welding of projection welding nuts on automobile parts.

[0005] The technical solution provided by the utility model is: a device for projection welding nuts on automobile parts, comprising an upper electrode, a lower electrode, a sensor and an MCU micro-control unit; the lower electrode comprises an electrode worm and an electrode seat connected to the electrode worm, the electrode seat consists of an electrode cover and a positioning pin, the electrode cover is provided with a positioning pin hole, the positioning pin is arranged in the positioning pin hole through a compression spring, and the electrode cover is electrically connected to the electrode worm; the sensor is installed at the bottom of the lower electrode, and the detection end of the sensor is arranged on the stroke of the positioning pin; the information output end of the sensor is connected to the information input end of the MCU micro-control unit; the control end of the MCU micro-control unit is connected to the discharge control end of the upper electrode.

[0006] The sensor is a contact displacement sensor.

[0007] During the nut welding process, this utility model first places the workpiece and nut on the positioning pin. The device is then activated, and the upper electrode descends until it presses the nut tightly. A displacement sensor measures the change in displacement during the downward movement of the nut and samples the data to the MCU. The MCU then determines whether the nut is correctly positioned based on the amount of downward pressure. This determines whether discharge welding is performed and whether an error alarm is output, achieving both nut welding and monitoring purposes. This utility model effectively prevents product scrapping, reduces losses, and improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural diagram of the utility model;

[0009] Figure 2 This is a simplified structural diagram of the utility model;

[0010] Figure 3 This is the electrical connection relationship and control block diagram of the precision sensor, MCU and upper electrode of the utility model. DETAILED DESCRIPTION

[0011] See also Figures 1 to 3 The utility model includes an upper electrode 1, a lower electrode 4, a high-precision contact displacement sensor 6, an MCU microcontroller unit 10 and an alarm 11. The lower electrode 4 includes an electrode worm 5 and an electrode seat connected to the electrode worm 5. The electrode seat is composed of an electrode cover 3 and a positioning pin 2. The electrode cover 3 is provided with a positioning pin hole. The positioning pin 3 is arranged in the positioning pin hole through a compression spring. The electrode cover 3 is electrically connected to the electrode worm 5; the sensor 6 is installed at the bottom of the lower electrode, and the probe (detection end) of the sensor 6 is arranged on the stroke of the positioning pin 3; the information output end of the sensor 6 is connected to the information input end of the MCU microcontroller unit 10; the control end of the MCU microcontroller unit 10 is connected to the discharge control end of the controller 9 of the upper electrode 1.

[0012] The utility model uses a high-precision displacement sensor to measure the distance that the positioning pin of the nut drops during the welding process to reflect whether the placement state of the nut before welding is qualified (the setting is based on the structure of the welding workpiece and is performed in the MCU controller. The measurement stroke of the drop distance can be set from 0 to 25 mm. For example, if the drop distance of the welding workpiece is set to 0.3 mm, it must be calibrated before welding. If the calibration value is less than 0.3 mm, it is qualified. If the calibration value is greater than 0.3 mm, it is unqualified. The equipment fault light alarms and the equipment cannot work. It must be reset before it can work again. It is the last detection equipment to judge whether the nut meets the welding conditions before welding.

[0013] During the nut welding cycle, the present invention first places the workpiece 7 and nut 8 on the positioning pin, then starts the device, lowers the upper electrode, and presses the workpiece 7 and nut 8 on the lower electrode downwardly by the upper electrode. A high-precision displacement sensor measures the change in precise displacement during the nut pressing process and transmits the detection signal to the MCU microcontroller unit. After the MCU microcontroller unit passes the detection, it finally outputs a control signal to the controller 9 of the upper electrode to initiate upper electrode discharge welding. The present invention uses a high-precision displacement sensor to measure the change in precise displacement during the nut pressing process (the data received by the sensor during the nut being pressed downwardly by the upper electrode is transmitted to the MCU control center for detection and transmission). The data is sampled and transmitted to the MCU control center. The nut placement state is determined to be correct based on the amount of downward pressure, thereby controlling whether the welder discharges and welds, outputs an error signal, and issues an alarm through the alarm 11, thereby achieving the purpose of nut welding monitoring.

Claims

1. A device for projection welding nuts on automobile parts, characterized in that: It includes an upper electrode, a lower electrode, a sensor and an MCU microcontroller unit; the lower electrode includes an electrode worm and an electrode seat connected to the electrode worm, the electrode seat consists of an electrode cover and a positioning pin, the electrode cover is provided with a positioning pin hole, the positioning pin is set in the positioning pin hole through a compression spring, and the electrode cover is electrically connected to the electrode worm; the sensor is installed at the bottom of the lower electrode, and the detection end of the sensor is set on the stroke of the positioning pin; the information output end of the sensor is connected to the information input end of the MCU microcontroller unit; the control end of the MCU microcontroller unit is connected to the discharge control end of the upper electrode.

2. The device for projection welding nuts on automobile parts according to claim 1, characterized in that: The sensor is a contact displacement sensor.

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