SU1498601A1 - Hydraulic system of broaching machine - Google Patents

Abstract

The invention relates to a machine-building hydraulic drive and can be used in hydraulic machines with a reciprocating drive of the main movement, mainly in pulling machines. The hydraulic system contains a slider 1 driven by a hydraulic cylinder 2 controlled by hydraulic distributors 3 and 4, a device 5 driven by a hydraulic cylinder 6 controlled by a hydraulic distributor 7 with an open center, retaining valves 11, 15 and 30, two pumps 12 and 13 each connected with a separate drive and with each other through a check valve 14. First, the workpiece is oriented by the hydraulic cylinder 6, and then the slide 1 moves at a fast feed due to the differential connection of the hydraulic cylinder 2 through the hydraulic distributor 3 or from the working the feed with the open connection also through the hydraulic distributor 3. The removal of the slide 1 is made by turning on the hydraulic distributor 7. It is possible to obtain a creeping speed for adjusting the machine.

Description

31

1b

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31498601

valves 11.15 and 30, two pumps 12 | and 13, each connected to a separate actuator and to each other via a reverse valve 14. First, the workpiece is oriented with a hydraulic cylinder 6, and then a slider 1 moves at a fast feed due to the differential connection of the hydraulic cylinder 2 through the hydraulic distributor 3 or with a working feed with an open connection also through the valve 3. The removal of the slide 1 is made by turning on the valve. 7, It is possible to obtain a creeping speed for adjusting the machine. 1 кп.

The invention relates to machine-building hydraulic actuator and can be used in hydraulic machines with a reciprocating drive of the main movement, mainly in pulling machines.

The purpose of the invention is to improve the thermal balance of a hydraulic system by reducing the number of local resistances, increasing speed and providing adjustment movements.

The drawing shows the scheme of the proposed hydraulic system.

The hydraulic system of the pulling machine contains a working slider 1 driven by a hydraulic cylinder 2, controlled by the first and second hydraulic power distributors 3 and 4, a device 5 driven by at least one hydraulic cylinder 6, controlled by a three-way hydraulic distributor 7,. the neutral position 8 of which is executed according to the scheme of communication of the supply 9 with the hydraulic tank 10, the retaining valve 11 and at least two pumps 12 and 13 are connected each with a separate drive and mark each other through a check valve. 14. The hydraulic system is also equipped with a hydraulic pressure valve 15, the inlet of which is connected to the inlet of the hydraulic distributor 7 to control the hydraulic cylinder 6, and the outlet to the inlets of the hydraulic distributors 3 and 4 of the control of the hydraulic cylinder 2 of the actuator of the slide block 1, which are made of three-position curved with a neutral position made according to the locking scheme all conclusions, while two opposite working leads. Conclusions 16 and 17 of both control valves 3 and 4 are connected to each other and to the rod end 18 of the hydraulic cylinder 2, the second working lead 19 of the first (3) and one of the drain The second terminals 20 of the second valve 4 are also interconnected to the piston cavity 21 of the same hydraulic 5

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cylinder 2, one of the slings pins 22 of the first hydraulic distributor. 3 is connected to the discharge pins 23 and 24 of two control valves 3 and 4 and pumps 12 and 13. The second working output 25 of the second control valve 4 is connected to the hydraulic tank 10, the second drain outlet 26 of this control valve 4 is locked with a plug 27, and the second drain output 28 of the first the hydraulic distributor 3 is connected to the q hydraulic tank 10 through a retaining valve 11.

In addition, there are an electromagnet 29, a retaining valve 30, a valve 31 of the sequence, a separator panel 32.

The hydraulic system of the machine is as follows.

The pilot's electromagnet 29 is turned on (not shown) and the main hydraulic distributor 7 with the control pressure, determined by the pressure check valves 15 and 30, is shifted to the extreme right position. The pump 13 is fed through the retaining valve 30 and the pump 12 is fed through the check valve 14 and summed up through the valve 7 into the cavity of the hydraulic cylinder 6 of the device 5. The product orientation elements are supplied, after which the pressure in the cavity of the hydraulic cylinder 6 increases, causing opening of a hydrovalpine 31 sequences. The product is clamped, and then the orientation elements are retracted. The travel command from clamping and retracting the orientation elements includes the working stroke of the slide 1.

The working stroke is pre-adjusted and can be carried out according to an open circuit with the supply of working fluid into the piston cavity 21 and discharge from the rod end 18 through a retaining valve 11 or according to a differential scheme in which both cavities

The 18 and 21 cylinders 2 and the discharge lines of the pumps 12 and 13 communicate with each other.

The working stroke is carried out according to the differential scheme} by switching on the hydraulic distributor 3 to the extreme left position. The flow of working fluid from the pump 13 through the hydraulic valve 15 pressure and the flow from the pump 12 through the non-return valve of the dividing panel 32 are summed up at the inlet to the control valve 3. Thanks to the external message of the outlets 22 and 23 of the pressure and drain in the control valve 3, the total flow from the two pumps 12 and 13, when folded with the volume of the rod end 18, through the valve 3 is directed into the piston cavity 21. The working stroke takes place with a maximum speed. The only hydraulic resistance to the movement of the working fluid at this connection is the valve 3, the second valve 4 is locked.

The open-stroke operation is performed by turning on the hydraulic distributor 3 to the extreme right position. At the same time, the piston cavity 21 of the hydraulic cylinder 2 is connected through the hydraulic distributor 3 with the common pumping hydroline of pumps 12 and 13, and the rod cavity 18 through the same hydraulic distributor 3 and through the supporting valve 15 is connected with the hydraulic tank 10. A working stroke with a small feed occurs. .

The pressure drop in the cavity 21 of the hydraulic cylinder 2 during the working stroke does not lead to a pressure drop in the hydraulic cylinder 6, since the hydraulic valve 15 pressure and the check valve 14 allow the flow of the working fluid in one direction only.

After the end of the working stroke, the valve 3 is set to the neutral position, and the valve 7 valve from the rightmost position moves to the left position. There is an uncoupling and unloading of the processed part and the loading of a new one. The end of these operations gives the command to turn on the return position of the slider 1, while the hydraulic spindle 4 moves to the right position, jointly the rod cavity 18 of the hydraulic cylinder 2 with pumps 12 and 13, and the piston cavity 21 - from the hydraulic cylinder 14986016

com 10. When reversing hydraulic resistance, you have one control valve 4.

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With the end of the reverse cycle

repeats.

When setting up the machine, changing the size of the workpiece or the need for checking the correct orientation and reliability of the product clamping, the valve 4 is turned into the left position, while pump 12 is unloaded through the valve 4, and pump 13 through the valve 7.

To debug the machine, when the need arises for a slider-1 slow-motion message, the low pressure valve in the dividing panel 32 is turned off, the valve 7 is set to the extreme position and the valves 3 and 4 are alternately turned on.

Thus, the hydraulic system of the pulling machine is operated.

Claims (1)

Invention Formula Hydraulic system of the machine, containing a working slider driven by a hydraulic cylinder controlled by the first and second hydraulic distributors, a device driven by at least one hydraulic cylinder controlled by a three-position reversing hydraulic distributor, the neutral position of which is fulfilled according to the message for supplying the hydraulic tank, a retaining valve, at least two pump, each connected to a separate drive and to each other through a non-return valve, such that, in order to improve the heat balance by reducing number of local resistance, improve performance and provide adjustment movements, it snabzhe-- pressure on hydraulic valves, the input of which communicates with the input of the control cylinders Hydrodistributor fixture, and an output - to the inputs of the control valves control the slide cylinder actuator which n tilineynymi vsholneny three-position to the neutral position, meet the following according to the scheme, lock all outputs, while two opposite working outputs of both control valves are connected to each other and with the rod 7 1498601. 8 the cavity of the hydraulic drive of the half of the two hydraulic distributors and pumping unit, the second working output of the first, the second working lead of the second guide and one of the drain of the second distributor connected to the hydraulic distributor are also connected, the second drain output of this hydraulics and a piston cavity distributor body and a piston hollow distributor body and a piston cavity. the same hydraulic cylinder, one of the drain-drain connection of the first hydrodistributed outputs of the first hydraulic distribution valve is connected to the hydraulic tank through The body is connected to the pressure terminals supporting valve.