WO2005005132A1

WO2005005132A1 - The hydraulic screw press

Info

Publication number: WO2005005132A1
Application number: PCT/CN2004/000448
Authority: WO
Inventors: Yourong Lu
Original assignee: Shanghai Yunliang Forging Press Co., Ltd
Priority date: 2003-07-10
Filing date: 2004-05-08
Publication date: 2005-01-20
Also published as: JP2007506555A; CN1565770A

Abstract

The present invention involves a hydraulic screw press, comprising a frame on which a screw rod is disposed. The flywheel is disposed on the upper end of the screw rod, the slide block and upper die are disposed on the lower end of the screw rod. The slide block can slide on the frame. At least two hydraulic cylinders are secured on the two sides of the frame, and the piston rod is connected to the slide block. The centre portion of the Lipper end cover of the hydraulic cylinder is provided with a comform throughhole, and the corresponding coniform buffering body is provided on the front end of the piston rod. In the securing means of the screw rod and the slide block, a keyslot is formed on the lower end of the nut and the upper end of the nut seat respectively. The nut and the nut seat are secured by a flat key. The auxiliary valve core of the servo valve is connected to the handle, and to the valve core of the triplet four way slide valve via a connecting rod.

Description

Push cylinder hydraulic screw press

Technical field

The present invention relates to a forging and pressing machine equipment, and particularly to a push cylinder hydraulic screw press.

Background technique

Traditional non-fixed range forging equipment is mainly divided into two categories: double disc friction presses and hydraulic screw presses such as oil motor type and clutch type. The former is noisy and has a high failure rate, and the nominal pressure is limited to below 2500T. Although the latter does not have many disadvantages of the former, it has a complicated structure, high manufacturing cost, and expensive equipment.

The push-cylinder hydraulic screw press uses the thrust of a hydraulic cylinder and the gravity of a moving part composed of a flywheel, a screw, a slider and an upper die to drive work to realize pressing forgings. Compared with hydraulic screw presses of the auxiliary screw type and oil motor type, this hydraulic screw press has a simple structure, easy manufacture, low cost, and convenient maintenance, but the failure rate of the brakes and overload protection devices of traditional hydraulic screw presses High, poor reliability, poor sensitivity of the hydraulic control system, large limitations, not suitable for large tonnage hydraulic screw presses. For example, in the prior art screw press, the structure of the screw and the slider is screw-connected with the screw and the nut, and then a cylindrical pin is fixed on the screw and the nut to prevent loosening. This nut anti-loosening structure, because the cylindrical pin is difficult to withstand the large radial force from the press in the working state, it is easy to create a gap between the screw and the nut, so that the nut loosens until it is damaged, which directly affects the press Work efficiency. For example, the brake devices in forging machines such as traditional double-disc friction presses are mostly mechanical brakes. The brake device of this structure has poor reliability and high failure rate in actual use, and the brake belt often breaks. The aging of the friction plate often causes brake failure. Summary of the invention

The technical problem to be solved by the present invention is to overcome the defects existing in the prior art mentioned above, and provide a new push-cylinder hydraulic screw press with simpler structure, high reliability, good sensitivity of the hydraulic control system, and strong practicability.

The present invention adopts the following technical solutions to solve its technical problems: A push-cylinder hydraulic screw press includes a frame, the frame is provided with a rotatable screw, a flywheel is fixed at the upper end of the screw, and a lower end of the screw is fixed. A slider and an upper die are fixedly arranged, and the slider can slide up and down along the groove on the frame to realize pressing and forging. It is characterized in that at least two hydraulic working cylinders are fixed on both sides of the frame, and the piston rod of the cylinder is fixedly connected with the slider on the frame; the central part of the upper end cover of the hydraulic working cylinder is provided with a conical opening. Hole, the front end of the piston rod is a corresponding conical buffer body; when the piston rod moves up and down, the conical buffer body and the conical through hole of the upper end cover are in a sliding connection; a key groove is arranged at the bottom of the nut in the screw and slider fixing device The upper part of the nut seat is also provided with a key groove, and the key groove between the nut and the nut seat is fixedly connected by a flat key; a servo valve connected to the handle in the hydraulic system, the auxiliary valve core of which is connected with a three-position four-way slide valve through a mechanical link The spools are connected.

The invention has the following obvious technical effects:

1. The present invention removes the original double-disc Mocha disc mechanism of the original double-disc Mocha press. Working hydraulic working cylinders are placed on both sides or around the frame as a power source, and the thrust of the working cylinder can be hydraulically controlled to drive The gravity driven part of the moving part works to realize the pressing forging. It has the advantages of simple structure, reliable performance, and sensitive control. At the same time, the working cylinder also plays the role of balancing the slider, so the traditional screw press is also eliminated in the present invention. Two balancing cylinders.

2. Use hydraulic buffer device instead of mechanical brake device, buffer body and upper end cover of working cylinder The conical through hole forms a throttling ring hole, and the throttling ring hole is used for buffering to achieve a braking effect, effectively preventing the slider from hitting the top, greatly improving the working efficiency of the press and ensuring its safety. .

3. The anti-loosening structure of the nut in the screw and slider coupling device is improved, the tightening force of the screw and the nut is increased, and the radial bearing capacity of the nut can be greatly improved.

4. The servo valve is used as the pilot valve to control the large-diameter slide valve to improve the sensitivity of the hydraulic control system, and the accumulator with hydraulic buffer function is set in the hydraulic control system as an extra-large-capacity accumulator without piston.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of the present invention;

2 is a side view of the structure of the present invention;

3 is a schematic structural diagram of another embodiment of the present invention;

4 is a sectional view of the structure of a hydraulic working cylinder of the present invention;

FIG. 5 is an enlarged sectional view of the structure of the screw and slider fixing device of the present invention; FIG.

Fig. 6 is a structural schematic diagram of a hydraulic system of the present invention.

Each serial number in the drawing is expressed as:

1 frame, 2 screws, 3 flywheels, 4 sliders, 5 hydraulic cylinders, 5.1 upper cavity, 5. 2 lower cavity, 6 bolts, 7 piston rods, 7. 1 piston, 8 nuts, 9 upper end cover 10 conical through holes, 11 conical buffers, 12 nuts, 13 nut seats, 14 flat keys, 15 bolts, 16 bearings, 17 joysticks, 18 servo valves, 18. 1 main spool, 18. 2 auxiliary valves Core, 19 mechanical connecting rod, 20 three-position four-way spool valve, 20.1 valve core, 21 check valve, 22 oil pump, 23 oil tank, 24 accumulator, 25 hydraulic control check valve, 26 check valve, 27 Check valve, 29 solenoid relief valve, 30 oil transfer pump, 31 control oil supply pump, 32 check valve, 33 solenoid relief valve, 34 two-position three-way solenoid directional valve, 35 oil level controller, 36 feedback device, A three-position four-way spool valve output port, B three-position four-way spool valve output port, P three-position four-way spool valve input port, T three-position four-way spool valve oil return port.

detailed description

The present invention is further described below with reference to the drawings and embodiments.

1 and 2, the present invention includes a frame 1, which is provided with a rotatable screw 2, a flywheel 3 is fixed on an upper end of the screw 2, and a slider is fixed on a lower end of the screw 2.

4 and the upper die, the slider 4 can slide up and down along the groove on the machine frame 1 to realize pressing and forging.

The present invention is provided with at least two hydraulic working cylinders 5 and is symmetrically fixed on both sides of the frame by bolts 6. The cylinder piston rod 7 and the slider 4 on the frame 1 are fixedly connected by nuts 8. .

Referring to FIG. 3, in this embodiment, four hydraulic working cylinders 5 are symmetrically fixed on the periphery of the frame 1 by bolts 6, and the piston rod 7 and the slider 4 are fixedly connected by nuts 8, respectively.

Referring to Fig. 4, the upper end of the hydraulic working cylinder block 5 of the present invention is fixedly connected to the upper end cover 9 by a screw. The upper end cover 9 is provided with a conical through hole 10 at the center and is connected to a hydraulic pipe.

The upper end of the piston rod 7 is connected to the conical buffer body 11 corresponding to the conical through hole 10 in the center of the upper end cover by screws, that is, the taper and taper of the conical through hole 10 in the upper end cover of the hydraulic cylinder block 5 and the conical buffer body 11 The direction is the same.

The lower part of the working cylinder block 5 is provided with oil inlet and outlet holes, and is connected with a hydraulic pipeline. When the piston rod 7 moves up and down, the conical buffer body 11 and the conical through-hole 10 of the upper end cover are in a sliding connection.

The tapered through hole 10 and the tapered buffer body 11 have a taper of 2 to 5 degrees and a working length of 60 to: L20mm. In this embodiment, the taper of the conical through hole 10 and the conical buffer body 11 is 5 degrees, working length is 120 legs.

When the present invention works, the piston rod 7 moves up and down. Because both the conical through-hole 10 and the conical buffer body 11 are cone-shaped, the hydraulic system drives the piston rod 7 to move. During continuous sliding, the contact between the two will increase. It is closer, and a throttle ring hole is formed, and the throttle ring hole is used for buffering to achieve a braking effect, which effectively prevents the slider 4 from hitting the top. The invention greatly improves the working efficiency of the press and ensures its safety.

Referring to FIG. 5, the present invention has a key groove at the bottom of the nut 12 in the fixing device of the screw 2 and the slider 4, and a key groove is also provided at the upper portion of the nut seat 13. The key groove between the nut 12 and the nut seat 13 is fixed by the flat key 14 connection.

The outer edges of the nut 12 and the nut seat 13 are fixedly connected by bolts 15. In use, the screw 2 is connected to the nut 12 through a bearing 16. In the present invention, the nut is divided into two bodies, that is, the nut 12 and the nut seat 13, and the original cylindrical pin is changed to the flat key 14 structure. By increasing the tightening force of the screw 2 and the nut, the radial bearing capacity of the nut can be greatly improved.

The screw lifting angle of the screw 2 according to the present invention is 15 ° ± 1 °. On a nominal 1600-ton press, the screw length is 3375 mm, the screw diameter is 500 mm, the nut length is 1030 mm, and the nut diameter is 690 mm. On a nominal 2000-ton press, its screw length is 3475 mm, screw diameter is 550 mm, nut length is 1110 mm, and nut diameter is 790 mm; on a nominal 3000-ton press, its screw length is 3980 mm and screw diameter is 650. Mm, nut length is 1300 mm, nut diameter is 940 mm; on a nominal 4000-ton press, the screw length is 4450 mm, the screw diameter is 750 mm, the nut length is 1600 mm, and the nut diameter is 750 mm.

Referring to FIG. 6, a servo connected to a joystick 17 in the hydraulic system according to the present invention 1 的连接 18。 Valve 18, its auxiliary spool 18. 2 through the mechanical link 19 and the spool 20. 1 of the three-position four-way slide valve 20 connected. -The output ports A and B of the three-position four-way slide valve 20 are connected to the upper and lower chambers of the hydraulic working cylinder block 5. 1 and 5. 2 through hydraulic pipes, respectively, and are connected to the lower chamber of the cylinder block. The corresponding input port P of the output port A is connected to the oil pump 22 through a hydraulic pipe, a one-way valve 21, and is connected to the upper cavity of the cylinder 5.1. The oil return port T corresponding to the output port B of the hydraulic pipe is connected with the hydraulic pipe through The fuel tank 23 is in communication.

An accumulator 24 communicates with the hydraulic chamber 5.2 hydraulic tube through the hydraulically controlled check valve 25 and the check valve 26, and communicates with the hydraulic tube in the upper cavity of the cylinder through the check valve 27. In addition, it also The output pipe of the check valve 21 connected to the oil pump 22 is in communication.

The following briefly describes the working principle of the present invention:

When the joystick 17 is in the intermediate position, the slider 4 of the hydraulic screw press is stopped. At this time, the oil pump 22 fills the accumulator 24 with oil. When the oil level pressure in the accumulator 24 reaches a set value, the electromagnetic relief valve 29 is unloaded, and the oil pump 22 performs an empty cycle. The oil delivery pump 30 is designed to supply oil to the oil pump 22, and the purpose is to make the oil pump 22 fully absorb oil, have high efficiency, reduce noise, and improve the life of the oil pump.

When the joystick 17 is in the upper position, the main spool 18.1 of the servo valve 18 moves to the left, at this time the oil in the a cavity flows into the c cavity through the internal passage of the secondary spool 18. 2 and flows back to the fuel tank, the secondary spool 18. 2 Move left under the pressure of the oil from the control oil supply pump 31, thereby driving the three-position four-way spool valve 20 spool 2. 1 to the left, open the A port of the valve, and the pressure oil from the accumulator 24 enters the hydraulic work In the lower cavity of the piston 7.1 in the cylinder block 5, the pressure oil pushes the piston upward, driving the slider 4, the screw 2, and the flywheel 3 upward.

When you need to stop the slider from going up, you can return the joystick 17 to the middle position and close the three positions Four-way spool valve 20, the pressure oil entering the lower cavity of the piston 7.1 in the hydraulic working cylinder 5 is cut off, and the lower cavity of the piston 7.1 in the hydraulic working cylinder 5 is generated due to the inertia of the moving part Suction, ― suck open the check valve 32, suck the oil in the oil tank 23 for replenishment, and the high pressure oil in the upper cavity of the piston 7.1 in the hydraulic cylinder block 5 can open the check valve 27. The valve 25 enters the accumulator 24 and is buffered by the accumulator 24 to absorb the kinetic energy of the moving part.

When the joystick 17 is in the lower position, the main spool 18.1 of the servo valve 18 moves to the right, and at this time, the pressure oil in the b cavity from the control oil supply pump 31 passes through the secondary spool 18.2 and the main spool 18.1 The internal channel between them enters the a cavity. Under the combined action of the pressures of the 3 and b cavities, the secondary spool 18.2 moves to the right (the force of the a cavity is greater than the force of the b cavity), thereby driving the three-position four-way slide valve. 20 The spool moves to the right and opens port B of the valve. The pressure oil from the accumulator 24 enters the upper cavity of the piston 7.1 in the hydraulic cylinder 5 and the pressure oil pushes the piston 7.1 and drives the slider 4, the screw. 2. The flywheel 3 descends, and the flywheel 3 rotates continuously to store the kinetic energy required for pressing and forging during the descending process. When the flywheel is descending, if it is necessary to reduce the energy of the slider to press the forging, the control handle 17 can be moved to the middle to close the three-position four-way slide valve 12 to cut off the pressure oil source and stop the piston 4 in the hydraulic working cylinder 5 At the moment, the inertia of the moving part makes the upper cavity of the piston 4 in the hydraulic working cylinder block 5 generate suction. The check valve 10 is opened, and the oil in the oil tank 27 is sucked in for replenishment. The high-pressure oil in the lower cavity of the piston 4 in 5 can open the check valve 13 and enter the accumulator 18 through the hydraulic control check valve 16. The accumulator 18 buffers and absorbs the kinetic energy of the moving part, thereby reducing the slider. Press the energy of the forging to achieve the purpose of regulating the energy.

The oil pump 31 is an oil supply pump that provides a hydraulic system for controlling the oil to the servo valve 18. The function of the electromagnetic overflow 31 is to ensure that the oil pressure system is unloaded when the oil pump 31 starts, and the oil pump enters no-load to start. And adjust the pressure of the hydraulic system. The role of the two-position three-way electromagnetic directional valve 34 is to ensure that the hydraulically controlled non-return valve 25 is closed reliably in the stopped state, so that the pressure oil in the accumulator 24 does not leak, and to ensure that the hydraulically controlled non-return valve 25 is in the started state. Turn on to supply pressure oil to the hydraulic system. The role of the electromagnetic relief valve 29 is to ensure that the hydraulic system is unloaded when the main oil pump 22 is started, the oil pump 22 is started with no load, to adjust the system pressure, and to control the system pressure and unload.

The upward pressure and unloading of the electromagnetic relief valve 29 are signaled by the oil level controller 20 to realize automatic control. When the oil level in the accumulator 24 reaches the set upper position, a signal is sent from the transmitting element of the oil level controller 35, the electromagnetic relief valve 29 is unloaded, and the system enters an empty cycle; when the oil in the accumulator 24 is When the position is set to the set lower position, a signal is sent from the transmitting element of the oil level controller 35, the electromagnetic relief valve 29 is pressed up, and the system supplies pressure oil to the accumulator 24.

The function of the feedback device 36 is to reduce the impact caused when the moving part suddenly stops when the slider 4 moves up to the extreme position. Through the feedback device 36, before the slider 4 rises to the extreme position, it touches the feedback device 36, and pulls the joystick 17 to the intermediate position through the link system, and closes the three-position four-way slide valve 20 through the servo valve 18 to make the oil circuit system The lower cavity of the piston 7.1 in the hydraulic working cylinder 5 is no longer supplied with pressure oil, the lifting power of the slider 4 is eliminated, and the top collision is prevented.

Industrial applicability:

The invention provides a new push-cylinder hydraulic screw press with simpler structure, high reliability, good sensitivity of the hydraulic control system, and strong practicability. Any similar design of the push-cylinder hydraulic screw pressure mechanism based on the concept and principle of the present invention should belong to the protection scope of the present invention.

Claims

Rights request

1. A push-cylinder hydraulic screw press, comprising a frame, the frame is provided with a rotatable screw, a flywheel is fixed at the upper end of the screw, and a slider and an upper mold are fixed at the lower end of the screw. The block can slide up and down along the groove on the frame to realize pressing forging, which is characterized in that at least two hydraulic working cylinders are fixed on both sides of the frame, and the cylinder piston rod and the frame The slider on the upper side is fixedly connected; the center of the upper end cover of the hydraulic working cylinder body is provided with a conical through hole, and the front end of the piston rod is a corresponding conical buffer body; when the piston rod moves up and down, the conical buffer body communicates with the upper end cover conically. The hole is in a sliding connection shape; a key groove is arranged at the bottom of the nut in the screw and slider fixing device, and a key groove is also arranged at the upper part of the nut seat, and the key groove between the nut and the nut seat is fixedly connected by a flat key; The auxiliary valve core of the handle servo valve is connected to the valve core of the three-position four-way slide valve through a mechanical connecting rod.

2. A push-cylinder hydraulic screw press according to claim 1, characterized in that: two hydraulic working cylinders are symmetrically fixed to both sides of the frame by bolts, and the piston rod and the slider are fixedly connected by nuts. .

3. The push-cylinder hydraulic screw press according to claim 1, characterized in that: four hydraulic working cylinders are symmetrically fixed on the periphery of the frame by bolts, and the piston rod and the slider are fixedly connected by nuts. .

4. A push-cylinder hydraulic screw press according to claim 1, characterized in that the conical through-hole of the upper end cover of the hydraulic working cylinder body is the same as the taper and taper direction of the conical buffer body of the piston rod.

5. The push-cylinder hydraulic screw press according to claim 1, characterized in that: the front end of the piston rod of the hydraulic working cylinder body is connected to the conical buffer body by screws.

6. The push-cylinder type hydraulic screw press according to claim 1, characterized in that: the front end of the hydraulic working cylinder body is fixedly connected to the upper end cover by a screw.

7. A push-cylinder hydraulic screw press according to claim 1 or 4, characterized in that the taper of the conical through hole and the conical buffer body is 2 to 5 degrees, and the working length is 60 to 120 faces. . ―

8. The push-cylinder hydraulic screw press according to claim 1, characterized in that: the screw is fixedly connected with the nut and the outer edge of the nut seat in the slider fixing device by bolts.

9. A push-cylinder hydraulic screw press according to claim 1 or 8, characterized in that: the screw lift angle of the screw is 15 ° ± 1 °, and the screw length on a nominal 1600-ton press 3375 mm, screw diameter is 500 mm, nut length is 1030 mm, nut diameter is 690 mm; on a nominal 2000 ton press, its screw length is 3475 mm, screw diameter is 550 mm, nut length is 1110 mm, nut diameter 790 mm; on a nominal 3000-ton press, the screw length is 3980 mm, screw diameter is 650 mm, nut length is 1300 mm, and nut diameter is 940 mm; on a nominal 4000-ton press, its screw length is 4450 mm, The screw diameter is 750 mm, the nut length is 1600 mm, and the nut diameter is 750 mm.

10. A push-cylinder hydraulic screw press according to claim 1, characterized in that the output of the three-position four-way slide valve in the hydraulic system is communicated with the upper and lower chambers of the hydraulic working cylinder body through a hydraulic pipeline, respectively. The input port corresponding to the output port of the hydraulic pipe connected to the lower cavity of the cylinder block is connected to the oil pump through a hydraulic pipe, and the oil return port corresponding to the output port of the hydraulic pipe to the upper cavity of the cylinder block is connected through the hydraulic pipe. Connected to the fuel tank.

11. A push-cylinder hydraulic screw press according to claim 1, characterized in that: an accumulator communicates with the hydraulic tube in the lower cavity of the cylinder through a hydraulically controlled check valve and a check valve, and through another A check valve is in communication with the hydraulic pipe in the upper cavity of the cylinder body, and is also in communication with the output pipe of the check valve connected to the oil pump.