RU78708U1 - DEVICE FOR MANUFACTURING BELLOWS - Google Patents

Abstract

A device for manufacturing bellows containing a frame on which a molding unit with replaceable cartridges and clamps is mounted, a plunger pump with an actuator, a pressure sensor and a safety valve, a compression tube for the workpiece, a control cabinet, a working fluid tank on which a circulation pump is located, in fluid communication with the working fluid tank and connected by a suitable pipeline through an electromagnetic valve to a plunger pump, which is connected by a pipe to the molding unit, distinguishing it consists in that screw jacks were used as the drive of the plunger pump and the compression drive of the billet tube, and to control the motors of these jacks, frequency converters built into the control cabinet, configured to generate control signals to the circulation pump, electromagnetic valve and the mentioned frequency converters, were used in a predetermined sequence, depending on the start signal and the signal of the pressure sensor of the plunger pump.

Description

The invention relates to the processing of metals by pressure, in particular to equipment for the manufacture of bellows, used as sensitive elements in devices for controlling and regulating temperature, in devices for measuring pressure, as flexible connectors in compensation nodes.

The hydraulic method is widely used, which consists in obtaining a bellows from a thin-walled pipe by pressure of the liquid from the inside with simultaneous axial compression and molding of the corrugated shell using external cartridges. A number of devices are known using this method for manufacturing bellows. [1, 2, 3, 4].

A well-known bellows machine, including a bed with a table, a molding block with a set of sectional dies, emulsion and oil hydraulic systems, electrical equipment [5]. An emulsion is used as the working fluid in the molding of the bellows, and oil is used in the axial compression cylinder of the tube during corrugation. Emulsion and oil are supplied by hydraulic pumps through control spools. Two tanks with a capacity of 60 liters with an emulsion and a capacity of 40 liters with oil and pumps are mounted on the frame of the bed. Electrical equipment consists of electric motors of oil and emulsion pumps and a control circuit.

This design has significant disadvantages.

The presence of hydraulic cylinders and spools in the switching system reduces the reliability of the device, complicates its maintenance. Switching the spools creates spasmodic changes in pressure during the molding process of the bellows, which causes a rupture of the tube-workpiece and the release of the working fluid. Marriage in production reaches 40%.

The technical result achieved in the claimed utility model is to create a smooth stroke of the actuators, which ensures the prevention of breaks in the workpiece tubes, obtaining high-quality bellows and increasing the environmental friendliness of the device.

The specified technical result is achieved by the fact that the claimed device uses one hydraulic system with a plunger pump for the working fluid, and screw jacks with asynchronous electric motors are used as the actuating mechanisms for compressing the tube — the workpiece and the drive of the plunger pump; frequency converters are used to control the rotation speed.

The utility model is illustrated by drawings, where

figure 1 - General view of the device;

figure 2 - molding unit.

A rack 14 with a molding block 7 and a flywheel 13, a screw jack 1 for compressing a workpiece tube, a plunger pump [6] 9 with a screw jack 2, a pressure sensor 11 and a safety valve 10, a tank 18 of a working fluid, a circulation pump 19 are installed on the frame 5 and a control cabinet 17. The molding unit 7 contains a removable cartridge 6, a lower 16 and an upper 8 clamps for the tube 15. The circulation pump 19 is in fluid communication with the tank 18 of the working fluid and is connected by a pipe 4 through an electromagnetic valve 3 to the inlet fitting of the plunger pump 9 The outlet nozzle of the plunger pump is connected by a pipe 12 to the upper clamp 8, in which there is a channel for supplying the working fluid to the workpiece tube 15. In the cabinet 17 there are frequency converters for controlling the speed of rotation of the screw jack asynchronous motors and the control circuit of the circulation pump, the electromagnetic valve and the aforementioned frequency converters in a predetermined sequence depending on the start signal and the signal of the pressure sensor of the plunger pump.

The device operates as follows. The pre-rolled tube billet 15 is inserted into the cartridge 6 and secured with clamps 16 and 8. The circulation pump 19 is turned on and the system and tube billet 15 are filled with low-pressure working fluid and air is displaced from the system. Then the tube 15 is hermetically clamped by the handwheel 13 and the automatic cycle button is pressed. The circulation pump 19 is turned off, and the system is shut off by the electromagnetic valve 3. The drive of the screw jack 2 of the plunger pump 9 is turned on, which smoothly raises the pressure inside the workpiece tube to the calculated value at which the pressure sensor 11 activates and the smooth compression of the workpiece tube begins with screw jack 1. In the process of corrugation, the volume of the tube decreases, and the excess amount of working fluid is discharged by the safety valve 10 into the tank 18. After the cycle is completed, the screws of the jacks 1 and 2 go back to the original Assumption. The handwheel 13 is turned away, the clamps 8 and 16 are released, the cassette 6 is opened and the finished bellows is removed.

Information sources:

1. K.N. Burtsev. Metal bellows. Mashgiz 1963, p. 109-115.

2. Copyright certificate No. 978975 class. W21D 15/10 1982 g

3. Copyright certificate No. 1263391 class. W21D 15/00 1986

4. Copyright certificate No. 1303216 class. W21D 15/10 1987

5. The machine is bellows. Technical description 4CM2. 120.017 TO. NIItechnopribor, Smolensk, 1972 (prototype).

6. Jabo V.V. Hydraulics and pumps. M, Energoatomizdat 1984, p. 213.

Claims (1)

A device for manufacturing bellows containing a frame on which a molding unit with replaceable cartridges and clamps is mounted, a plunger pump with an actuator, a pressure sensor and a safety valve, a compression tube for the workpiece, a control cabinet, a working fluid tank on which a circulation pump is located, in fluid communication with the working fluid tank and connected by a suitable pipeline through an electromagnetic valve to a plunger pump, which is connected by a pipe to the molding unit, distinguishing it consists in that screw jacks were used as the drive of the plunger pump and the compression drive of the billet tube, and to control the motors of these jacks, frequency converters built into the control cabinet, configured to generate control signals to the circulation pump, electromagnetic valve and the mentioned frequency converters, were used in a predetermined sequence, depending on the start signal and the signal of the pressure sensor of the plunger pump.