What Is a Pneumatic Riveter?

Pneumatic rivet machine (also called pneumatic riveting machine, pneumatic rotary riveting machine, pneumatic riveting machine, pneumatic riveting machine, etc.) is one of the rivet machines, which refers to mechanical equipment that can rivet items with rivets, rivets The machine mainly relies on rotation and pressure to complete the assembly work.

Pneumatic rivet machine is a pneumatic tool for riveting metal components in an impact manner. Pneumatic rivet machine is also known as pneumatic rivet gun or pneumatic rivet gun or pneumatic rivet gun or pneumatic core rivet gun. It has different names and is currently an advanced domestic riveting tool. .

Scope: aluminum door and window manufacturing, computer outside, electronics manufacturing, other various riveting operations;

Uses: Suitable for automobile, train, ship, aviation and other sheet metal fastening connection structure industries; computer cases, electrical cases, kitchen cabinets, etc. must be drawn and fastened; aluminum alloy doors and windows, interior decoration, etc. must be fastened.

The car brake rivet machine is used for riveting between the brake shoe and the brake palm of the car, and is a widely used equipment in the auto repair industry. At present, there are mainly two types of transmission methods used in brake rivet machines: one is hydraulic transmission, and the other uses compressed air as power, and uses a gas-liquid booster cylinder to convert low-pressure air into high-pressure oil to drive the oil cylinder. The former includes motor-hydraulic devices such as motors, hydraulic pumps, valves, and fuel tanks. This not only increases the volume of the rivet machine, but also easily causes leakage, pollution, and noise. At the same time, in the riveting process, due to the fast punching speed, the skill level of the operator is required to be high. In addition, there are reasons such as pressure shock, uneven force, etc., and the brake pads may be crushed. In addition to the latter, the softness of the gas-liquid booster cylinder can achieve no impact during the working process due to the compressibility of the gas, thereby improving the riveting quality of the brake shoe and the life of the mold. At present, domestic pure rivet machines are generally driven by pure hydraulic pressure. The reason is that the development of gas-liquid booster components started late in China. In foreign countries, the use of gas-liquid booster cylinders as power actuators on some stamping equipment is very common, such as the German TOX company, but its price is very expensive. This machine uses a gas-hydraulic booster cylinder as the power actuator, which can realize flexible riveting between the car brake shoe and the brake palm. It has the advantages of reliable riveting, simple operation, low noise, energy saving, large adjustment range of riveting force, and small size. Suitable for riveting of brake shoes of various specifications.

(1) Structure

This machine is mainly composed of frame, upper mold, lower mold, gas-liquid pressurization system, etc. The structure diagram of the whole machine is shown in Figure 1. The schematic diagram of the gas-liquid booster system is shown in Figure 2. It consists of a gas source triplet 1, a foot-operated pneumatic directional valve 2, a fast exhaust throttle valve 3, a gas-liquid booster cylinder 4, a one-way pressure reducing valve 5 and Composed of 6 cylinders.

The performance parameter test system is shown in Figure 3. The tested sample machine, measuring rod and energy absorption device are installed on the test bench. The thrust cylinder applies thrust to the product under test.

Figure 3 Schematic diagram of the performance parameter test system

The length of the measuring rod needs to be sufficient to accurately capture the human stress waveform and avoid the interference of reflected waves. One end is placed in the energy absorbing device.

Two sets of strain gauges are attached to the two sides of the rod on the measuring rod, and one arm in series as a half bridge is used to detect the longitudinal wave in the rod. The voltage measured in the bridge is appropriately amplified by the strain gauge, and the input to the data acquisition system sequentially and accurately captures the incident stress wave of each impact. After A / D conversion, the input microcomputer through the interface performs data processing. The maximum stress, impact energy, and impact frequency of the test rod for 25 consecutive impacts and their statistical values are obtained. The printer gives the corresponding digital results and four stress waveform sampling curves.

The test of working pressure and temperature is completed by the pressure and temperature sensors installed on the gas tanker, which are amplified by the secondary instrument, sent to the A / D board for conversion, and transferred to a microcomputer for data processing, printing, and drawing. The gas consumption test is completed by a flow meter installed at the air inlet of the gas storage tank. The analog signal is sent to the A / D board for conversion, and the computer is used to process the data and print the results.

Impact energy testing and calibration are performed on a test bench. The test bench adopts a double-column structure, and the calibration and testing devices can be replaced and adjusted as needed, which can be easily disassembled. The test benches are respectively equipped with energy absorbers adapted to pneumatic rivet machines. The gas tank truck is equipped with a pressure regulating valve, an oil mister and a valve to adjust the working pressure of the sample to be tested, and a flow meter, a pressure sensor, a temperature sensor and a precision pressure gauge are installed on the gas tanker.

The instrumentation table will be equipped with strain amplifiers, pressure and temperature digital display meters, data acquisition systems, microcomputers (including displays), printers, and flowmeter power supplies inside or on the table. ^[2]