SU679425A1 - Hydraulic press drive - Google Patents

Description

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The invention relates to the processing of metals by pressure and is intended to drive hydraulic presses.

A hydraulic press drive is known in which the stroke of the press working unit is controlled by the action of a moving element of a control unit mounted on movable parts of the working body of a press on a fixed element of a control unit that can be installed, for example, on a frame at the end of the stroke of the working body of a press fll.

In some drives of hydraulic presses, control presses for pressing are placed in the pressing zone /, which makes them unreliable in operation due to the possibility of pop. Dani pressed material.

Known drive press, containing the power cylinder and control devices acting on the sensors of the end position of the working body of the press 2.

However, in the known press drive, the camcorders are also not reliable enough, which is related to the relatively movable exhibition of the moving part, changing their relative position during operation, and also the need to increase the press dimensions by an amount equal to the stroke of the hydraulic cylinder piston.

The purpose of the invention is to improve the conditions of service.

The goal is achieved due to the fact that each command device is made in the form of a stepped plunger,

The low stage of which is installed in the bottom of the power cylinder, and the large one is located in an additional cavity fixed on the cylinder body and hydraulically connected to the 5 main cavity of the power cylinder. In addition, the plunger stage entering the additional cavity is spring-loaded, the plunger is made in the form of two parts of different diameters connected by a hinged element.

Claims (2)

FIG. Figure 1 shows schematically a press for packing metal scrap; in fig. 2, 3, 4 - versions of the execution of the command apparatuses of the final position of the press operating unit. The press consists of the pressing chamber 1, the working body 2 of the first pressing, having a power hydraulic cylinder 3, the piston 4 of which is connected to the working body 2 by a stem 5, a working body 6 of the second pressing with a power HYDROCILINDRUM 7. The device KOf of the end position operating device of the press body made in the de-stepped plunger 8 double-acting, one end 9 of which b ® ® smaller diameter enters the stem of the power cylinder, and the other end 10 of the larger diameter ® enters S additional cavity II f fixed on the hydraulic cylinder body Cavity 11 is connected to the hydraulic cylinder rod cavity® by means of channel 12, filled in a piston 8 o. On the piston 8 there is an intermediate 13 fixed, which starts when the plunger moves to the sensor 14. The press drive works as follows. When the first press is made, the working body 2 moves under the influence of the piston 4 of the cylinder 3 into the piston cavity of which oil is supplied from the hydraulic pump. The movement takes place until the piston. 4 will not press the protruding end 9 of the plunger 8. The plunger 8, by moving, with its element 13, acts on the sensor 14, issuing a command to stop the pressing. When the piston 4 retracts due to the difference between the stages 9 and 10 and the equality of pressure in the rod end of the hydraulic cylinder 3 and the additional cavity 11, the plunger 8 returns to its original position. In other embodiments of the plunger 8 (see Fig. 3), it returns to its original position. by spring 15; in fig. 4 shows a plunger made in the form of independent parts 16 and 17 of equal diameter, connected by an articulated lever 18. Part 16 under the influence of the piston 4 through the lever 18 the sensor 14 is frozen. The return of part 16 to its original position is due to the difference in the diameters of parts 16 and 17, the ends of which are under pressure of the working fluid in the rod cavity of the cylinder 3. Similarly, the work of the second pressing force body 6 proceeds. The end position command devices can also be installed in the piston cavity of the working hydraulic cylinder, where they will determine the final position of the reverse stroke of the press working element. Such an embodiment of a hydraulic press drive, for example for packing scrap metal, makes it more compact, avoids placing command apparatuses for the working area of the press and simplifies the maintenance of these devices. Claim 1: A hydraulic press drive containing a power hydraulic cylinder and command apparatuses acting on sensors for the end position of a press working member, characterized in that, in order to improve service conditions, each command appliance is made in the form of a stepped plunger whose small step is installed in the bottom of the power hydraulic cylinder The large one is located in an additional cavity fixed on the cylinder body and hydraulically connected with the main cavity of the power cylinder. 2 "The actuator according to claim 1, differing to and from there, that the plunger stage, entering the additional cavity, is spring-loaded. 3, Drive according to Claims 1 and 2, characterized in that the plunger is made in the form of two parts of pr-dia diameter connected to each other by means of a hinged element. Sources of information taken into account in the examination 1. The Federal Republic of Germany patent f 2342098, cl. B 30 V 15/16, 1975.. 2. USSR author's certificate number 397371, cl. B 30 V 15/16, 1969.