Hydraulic drive

 

The invention is intended to create pressure when welding pressure plastic pipes. The actuator includes a motor coupled to the pump, spool valve, the working cavity which is communicated with the hydraulic cylinder, and one cavity is communicated through the check valve, after which there is a hydraulic accumulator and the Registrar of the pressure in the pressure line of the pump has an adjustable pressure relief valve, the output shaft of the control valve spool has a groove that interacts with the balls through the plungers with spring-loaded shutter valve switch and motor, a check valve between the ball and the plunger in the sleeve mounted element, which is based on U-shaped fork, cover with a clearance output shaft of the spool, when this plug communicates through the ball with the rod of the regulatory body. The technical result is increased reliability of the drive. 2 Il.

The invention relates to mechanical engineering and can be used in the hydraulic pressure when welding plastic pipes of different diameters.

A known hydraulic system used in hydraulic presspan 56, included in the pressure line 57 of the pump 51, a hydraulically operated pressure relief valve 1 connected to the pressure line 57. The system differs in that the valve 1 includes a housing 2 with a cavity 7, which connects the input window 16 with the outlet window 24; a shutter 3, a freely sliding in the cavity 7, forming its rear surface cavity hydraulic control 31, a chamber connected with the steering box 33, and depending on the contiguity to saddle 17 connecting the window 16 and 24 between them or release them; the spring 26, abutting against one end wall of the housing 2 and the other end into the front surface of the shutter 3. The input window 16 valve I is connected to the pressure line 57 behind the check valve 56, the output window 24 is connected to the tank 63, and the steering box 33 is connected to the pressure line 57 in front of the check valve 56. When you turn off the pump 51, the fluid trapped in check valve 56 in the pressure line 57, is produced in the tank (see Japan patent 4-65248, CL 5 F 15 B 20/00, F 16 K 31/122).

This hydraulic system does not allow the discharge of the metered fluid in the torque required of the drive.

The closest in technical essence to the present invention is a hydraulic actuator, where the check valve 58 includes a saddle 109 main stand with a large bandwidth-section; the main valve 106, forming a working couple with a saddle 109 and passing the working fluid in the forward direction, but do not let it in reverse; the seat 112 of the auxiliary valve, made inside the main valve 106 and having an aperture for the passage of fluid from the small area of a carrying section; an auxiliary valve 107, forming a working couple with the seat 112 and passing the working fluid in the forward direction, but do not let it in reverse; the plunger 115, located coaxially with the valve 106, 107 and provides a consistent opening the first valve 107, and then the valve 106.

The plunger 115 is connected with the valve 56 so that movement of the valve 56 of the stop position And the position of the lowering With causes it to trigger. In series with a check valve 58 to the line connecting the valve 56 and the cylinder 22f, 22g, connected inductor 57. The valve 56 are obtained by forming flats on the outer surface of the spool of this valve, moving in the hole 61, the small throttling slit 921, 922, which create the hydraulic resistance in the path of the working fluid through the valve 56, respectively, when the valve in an intermediate position between the stop and the I position (see the Japan patent 4-61964, CL 5 F 15 B 11/04, A 01 B 63/10, B 60 K 17/06).

The disadvantage of this hydraulic drive is the inability to produce a dosed discharge pressure of the working fluid in the torque required of the drive.

Task to be solved by the present invention is directed, is a device that provides a dosed discharge of pressure fluid from the cylinder cavity for holding automationname process at the micro level in the zone of the welded surfaces when welding pressure plastic pipes of different diameters. This task is solved in that the hydraulic drive with the motor connected to the pump, spool valve, the working cavity which is communicated with the hydraulic cylinder, and one cavity is communicated through the check valve, after which there is a hydraulic accumulator and the Registrar of the pressure in the pressure line of the pump has an adjustable pressure relief valve, the output shaft of the control valve spool has a groove that interacts with the balls through the plungers with spring-loaded shutter valve switch and motor, while the new is that the check valve between the ball and the thickness of the shaft of the spool, when this plug communicates through the ball with the rod of the regulatory body.

In Fig.1, 2 represents the drive that contains the electric motor 1, which is connected with the pump 2, the spool valve 3, working cavities 4 and 5, the hydraulic cylinder 6, the check valve 7, the switch 8 of the electric motor, a hydraulic accumulator 9, 10 Registrar pressure adjustable relief valve 11, tank 12 to the working fluid, the filter 13.

The check valve 7 has a saddle 14, the overlapped spring-loaded shutter 15. The shutter 15 is connected through the plunger 16 and the element 19 with the ball 17 in the sleeve 18. The ball 17 communicates with the groove on the output shaft of the control valve spool 3 and the element 19. The element 19 rests U-shaped fork 20, covering with a clearance output shaft of the spool to prevent rubbing during movement of the spool and a U-shaped fork.

To ensure the opening of the shutter 15 in the design of the drive entered the stem 21 of the regulatory body.

Between the rod 21 and the fork 20 to reduce friction put the ball 22.

The drive works as follows.

When the deviation of the arm directional control valve 3 to provide compression of the ends of the plastic tubes included motor 1 which rotates the pump 2 which is by extension of the plunger through the ball, interacting with the second groove of the output shaft of the spool, with the subsequent closure of the contacts of the switch 8 in the supply circuit of the motor (design schematically shown in Fig.1). The valve 3 connects the cavities of R, a and T, and the cavity pressure P and discharge T are connected with the cavity of the cylinder 6.

In addition, simultaneously release the shutter 15 of the seat 14 of the check valve 7 for the passage of fluid to the cylinder cavity 6.

Maintain the desired discharge pressure is provided by an adjustable relief valve 11, the pressure control is performed by the recorder 10.

When the return lever valve 3 in the middle position closes the check valve 7, and the cavity of the P and T of valve 3 connected to each other and enables the motor 1 drive.

The check valve 7 maintains the desired pressure in the working cylinder cavity 6 to ensure the welding process, while the hydraulic accumulator 9 compensate for possible leakage of the working fluid.

When the deviation of the arm directional control valve 3 in the opposite direction is subtracted check valve 7, are connected to the cavity R & Hildren cylinder 6 is provided by turning the stem 21 of the regulating element, when the rod 21, acting on the ball 22 through the P-shaped plug 20, presses the plunger 16 and through it opens the shutter 15 in the saddle 14.

Control the desired pressure of the working fluid is carried out by the Registrar 10.

After a reset, the required pressure is aging in this position specified time to ensure automationname process at the micro level in the zone of the welded surfaces when welding pressure plastic pipes.

A positive effect in carrying out the invention manifests itself in the reliability of the drive, which is confirmed by the results of prototype tests.

Application of the proposed hydraulic drive allows the dosed discharge of pressure fluid to the desired size of the cylinder cavity at the required moment in order to provide automationname process at the micro level in the zone of the welded surfaces when welding pressure plastic pipes of different diameters, as well as to regulate and maintain the pressure in the actuator due to changes in the external temperature conditions.

Claims

Hydraulic drive with the motor connected to the pump, Bolotnikova check valve, after which there is a hydraulic accumulator and the Registrar of the pressure in the pressure line of the pump has an adjustable pressure relief valve, the output shaft of the control valve spool has a groove that interacts with the balls through the plungers with spring-loaded shutter valve switch and motor, characterized in that a check valve between the ball and the plunger in the sleeve mounted element, which is based on U-shaped fork, cover with a clearance output shaft of the spool, while the plug communicates through the ball with the rod of the regulatory body.

 

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