WO2021056659A1

WO2021056659A1 - Open hydraulic pump-controlled motor-driven rotary forging press machine

Info

Publication number: WO2021056659A1
Application number: PCT/CN2019/113195
Authority: WO
Inventors: 熊义; 郭凡; 马冲
Original assignee: 南通锻压设备如皋有限公司
Priority date: 2019-09-23
Filing date: 2019-10-25
Publication date: 2021-04-01
Also published as: CN110625052A

Abstract

An open hydraulic pump-controlled motor-driven rotary forging press machine, mainly comprising: pinions (1), racks (2), stop wheels (3), balance cylinders (4), a sliding block (5), guide rails (6), a main frame (7), and an electrohydraulic system. The electrohydraulic system comprises: an electrohydraulic proportional variable-displacement hydraulic motor (801); an oil supplement one-way valve (802), a support safety valve (803), a support electrohydraulic ball valve (804), a quick exhaust valve (805), a pressing overflow valve (806), a back pressure overflow valve (807), a three-way electrohydraulic reversing valve (808), a two-way electrohydraulic reversing valve (809), a system one-way valve (810), an electrohydraulic proportional variable-displacement pump (811), a system overflow valve (812), a two-way solenoid valve (813), an accumulator overflow valve (814), an accumulator group (815), etc. The press machine combining open pump-controlled motor hydraulic drive with rack and pinion mechanical drive implements high working efficiency of the press machine, can also complete automatic stepless adjustment of procedure parameters such as the pressing force and pressing speed, and has excellent process flexibility.

Description

An open hydraulic pump-controlled motor-driven pendulum forging press

Technical field

The invention relates to a press, in particular to a swinging press, in particular to an open hydraulic pump-controlled motor-driven swinging press.

Background technique

Oscillating rolling is a relatively complicated forging forming process, which requires flexible control of parameters such as the movement and force of the forming equipment-press. At the same time, rolling rolling is a hot forging process, which also has high requirements for the working efficiency of the hydraulic press. Presses can be divided into hydraulic presses and mechanical presses according to the transmission mode. The transmission mechanism of hydraulic press has a large power-to-volume ratio, which is easy to achieve linear transmission, stepless speed regulation, pressure adjustment and maintenance, etc. However, hydraulic presses have low working efficiency, and high-speed hydraulic presses have very complicated systems; mechanical presses have high working efficiency. However, it cannot output a constant pressing force in a large stroke range. The flexible adjustment of the parameters of the mechanical press and the long-term maintenance of the pressure performance also require very complex structures and systems to achieve. How to combine hydraulic transmission and mechanical transmission to develop a new hybrid drive mode with the advantages of both is one of the development directions in the technical field of presses.

Summary of the invention

The purpose of the present invention is to provide an open hydraulic pump-controlled motor-driven oscillating forging press, which has the advantages of both hydraulic transmission and mechanical transmission, not only has high working efficiency, but also is easy to realize flexible adjustment of process parameters.

The technical scheme of the present invention is as follows:

The present invention mainly includes gears, racks, gear wheels, balance cylinders, sliding blocks, guide rails, mainframes, electro-hydraulic systems, etc. The shaft of the gear is installed on the upper plane of the upper beam of the main frame; the rack passes through the upper beam of the main frame, and the lower end of the rack is fixedly installed on the upper plane of the slider; the gear meshes with the rack, and the lower slider is driven by the gear It can move up and down; the bearing of the stop wheel is fixedly installed on the upper plane of the upper beam of the main frame, the cylindrical surface of the stop wheel and the plane of the rack form a friction pair, and the stop wheel is used to balance the lateral force of the rack; the cylinder of the balance cylinder The body is fixedly installed on the upper beam of the main frame, the piston rod of the balancing cylinder is fixedly installed on the brackets on both sides of the sliding block, the balancing cylinder is used to balance the gravity of the sliding block assembly; the sliding block is placed on the inner gear of the main frame; the guide rail is fixedly installed On the left and right columns of the main frame, the guide rail and the guide plate of the slider form a plane friction pair, and the guide rail plays a guiding and supporting role for the slider; the main frame is a closed frame with a certain rigidity; the electro-hydraulic system is mainly used to drive and control gears Movement with balance cylinder.

Further, the electro-hydraulic system of the present invention also includes: an electro-hydraulic proportional variable hydraulic motor, a supplementary check valve, a supporting safety valve, a supporting electro-hydraulic ball valve, a quick discharge valve, a suppressing relief valve, a back pressure relief valve, Three-way electro-hydraulic reversing valve, two-way electro-hydraulic reversing valve, system one-way valve, electro-hydraulic proportional variable pump, system overflow valve, two-way solenoid valve, accumulator overflow valve, accumulator group, etc. The output shaft of the electro-hydraulic proportional variable hydraulic motor is coaxially connected with the gear; the forward rotation oil inlet A of the electro-hydraulic proportional variable hydraulic motor and the oil outlet of the charge check valve, the oil inlet of the pressure relief valve, and the three-way power The A port of the hydraulic reversing valve is connected; the reverse oil inlet B of the electro-hydraulic proportional variable hydraulic motor is connected to the oil inlet supporting the safety valve and the A port supporting the electro-hydraulic ball valve; the P port supporting the electro-hydraulic ball valve is connected with the quick discharge The valve port A, the oil inlet port of the back pressure relief valve, and the two-way electro-hydraulic directional valve are connected; the oil outlet of the system one-way valve is connected to the P port of the three-way electro-hydraulic directional valve, and the two-way electro-hydraulic reversal The P port of the valve, the oil inlet of the system overflow valve, and the P port of the two-way solenoid valve are connected; the oil outlet of the electro-hydraulic proportional variable pump is connected with the oil inlet of the system check valve; the A port of the two-way solenoid valve Connected with the oil inlet of the accumulator relief valve, the oil port of the accumulator group, and the rod cavity of the balance cylinder; the rodless cavity of the balance cylinder is connected to the atmosphere; the oil inlet and support of the replenishment check valve are safe The oil outlet of the valve, the oil outlet of the quick-discharge valve, the oil outlet of the pressure relief valve, the oil outlet of the back pressure relief valve, the T port of the three-way electro-hydraulic directional valve, the oil suction of the electro-hydraulic proportional variable pump The oil outlet, the oil outlet of the system overflow valve, and the oil outlet of the accumulator overflow valve are connected with the hydraulic oil tank.

The beneficial effects of the present invention are as follows:

1. The invention combines the hydraulic drive of the open pump-controlled motor with the mechanical drive of the gear rack and pinion to realize the hybrid drive of the oscillating forging press, which can complete high-frequency sub-strokes, and the process parameters of the press are easy to flexibly adjust.

2. The hydraulic transmission part of the present invention is an open pump-controlled motor, which adopts the electro-hydraulic proportional variable pump to match the electro-hydraulic proportional variable hydraulic motor, with a wide adjustment range of the pressing speed, and various matching forms of the pressing force and the pressing speed.

3. The present invention is equipped with a balance cylinder equipped with a balance slider and a body weight, realizes the recycling and reuse of energy, reduces the useless power consumption, and the press runs smoothly and has low impact; it is further matched with the hydraulic pump with adjustable displacement and Motors and presses have flexibility in energy consumption management.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the present invention.

Figure 2 is a schematic diagram of the hydraulic pressure of the present invention.

In Figure 1: 1-gear, 2-rack, 3-block wheel, 4-balance cylinder, 5-slider, 6-rail, 7-host frame.

In Figure 2: 1-gear, 4-balance cylinder, 801-electro-hydraulic proportional variable hydraulic motor, 802-charge check valve, 803-support safety valve, 804-support electro-hydraulic ball valve, 805-quick exhaust valve, 806 -Suppression relief valve, 807-back pressure relief valve, 808-three-way electro-hydraulic directional valve, 809-two-way electro-hydraulic directional valve, 810-system check valve, 811-electro-hydraulic proportional variable pump, 812-system Overflow valve, 813-two-way solenoid valve, 814-accumulator overflow valve, 815-accumulator group.

detailed description

The present invention will be further explained below in conjunction with the accompanying drawings.

Referring to Fig. 1, the present invention includes: gear 1, rack 2, stop wheel 3, balance cylinder 4, sliding block 5, guide rail 6, main frame 7, electro-hydraulic system 8, etc. The shaft of the gear 1 is installed on the upper plane of the upper beam of the main frame 7; the rack 2 passes through the upper beam of the main frame 7, and the lower end of the rack 2 is fixedly installed on the upper plane of the slider 5; the gear 1 meshes with the rack 2 , The sliding block 5 can move up and down under the drive of the gear 1; the bearing of the stop wheel 3 is fixedly installed on the upper plane of the upper beam of the main frame 7, the cylindrical surface of the stop wheel 3 and the plane of the rack 2 form a friction pair, the stop wheel 3 Used to balance the lateral force received by the rack 2; the cylinder body of the balance cylinder 4 is fixedly installed on the upper beam of the main frame 7, and the piston rod of the balance cylinder 4 is fixedly installed on the two side supports of the slider 5. The balance cylinder 4 is used for Balance the gravity of the assembly of the slider 5; the slider 5 is placed in the inner gear of the main frame 7; the guide rail 6 is fixedly installed on the left and right columns of the main frame 7, the guide rail 6 and the guide plate of the slider 5 form a plane friction pair, and the guide rails 6 are paired The sliding block 5 plays a role of guiding and supporting; the main frame 7 is a closed frame with a certain rigidity; the electro-hydraulic system 8 is mainly used to drive and control the movement of the gear 1 and the balance cylinder 4.

Referring to Figure 2, the electro-hydraulic system 8 of the present invention mainly includes: electro-hydraulic proportional variable hydraulic motor 801, replenishing check valve 802, supporting safety valve 803, supporting electro-hydraulic ball valve 804, quick exhaust valve 805, and suppressing overflow valve 806, back pressure relief valve 807, three-way electro-hydraulic reversing valve 808, two-way electro-hydraulic reversing valve 809, system one-way valve 810, electro-hydraulic proportional variable pump 811, system relief valve 812, two-way solenoid valve 813, Accumulator overflow valve 814, accumulator bank 815, etc. The output shaft of the electro-hydraulic proportional variable hydraulic motor 801 is coaxially connected with the gear 1; the forward rotation oil inlet A of the electro-hydraulic proportional variable hydraulic motor 801 and the oil outlet of the charge check valve 802, and suppress the inlet of the overflow valve 806 The oil port and the port A of the three-way electro-hydraulic reversing valve 808 are connected; the reversing oil inlet B of the electro-hydraulic proportional variable hydraulic motor 801 is connected to the oil inlet supporting the safety valve 803 and the port A supporting the electro-hydraulic ball valve 804; support The P port of the electro-hydraulic ball valve 804 is connected with the A port of the quick-discharge valve 805, the oil inlet of the back pressure relief valve 807, and the A port of the two-way electro-hydraulic reversing valve 809; the oil outlet of the system check valve 810 is connected to the three The P port of the electro-hydraulic reversing valve 808, the P port of the two-way electro-hydraulic reversing valve 809, the oil inlet of the system overflow valve 812, and the P port of the two-way solenoid valve 813 are connected; the oil output of the electro-hydraulic proportional variable pump 811 The port is connected with the oil inlet of the system check valve 810; the A port of the two-way solenoid valve 813 and the oil inlet of the accumulator relief valve 814, the oil port of the accumulator group 815, and the rod cavity of the balance cylinder 4 Connected; the rodless chamber of the balance cylinder 4 is connected to the atmosphere; the oil inlet of the charge check valve 802, the oil outlet of the supporting safety valve 803, the oil outlet of the quick drain valve 805, and the oil outlet of the pressure relief valve 806 Port, the oil outlet of the back pressure relief valve 807, the T port of the three-way electro-hydraulic directional valve 808, the oil suction port of the electro-hydraulic proportional variable pump 811, the oil outlet of the system relief valve 812, and the accumulator relief valve The oil outlet of 814 is connected to the hydraulic oil tank.

In practical applications, the press is driven by multiple sets of gears 1 and racks 2 according to the present invention in parallel to meet the requirements of tonnage, structural matching, etc. The electro-hydraulic proportional variable hydraulic motor 801 is configured correspondingly to the The number of gears 1 and rack 2 are the same. The number of the electro-hydraulic proportional variable pump 811 and the accumulator group 815 is designed and configured according to the technical specifications of the press.

Next, a single working cycle of the press is taken as an example to illustrate the working principle of the present invention:

1. The press slide is fast down

At this stage, the supporting electro-hydraulic ball valve 804 and the three-way electro-hydraulic reversing valve 808 are in the energized state, the two-way electro-hydraulic reversing valve 809 and the two-way solenoid valve 813 are in the de-energized state, and the electro-hydraulic proportional variable hydraulic motor 801 is set to a small displacement. The electro-hydraulic proportional variable pump 811 is set to full displacement; the opening of the quick-discharge valve 805 gradually increases to a certain set value according to the required fast-down speed, and the press slider 5 accelerates downward under the action of gravity. Bar 2 drives gear 1 to rotate to drive the coaxial electro-hydraulic proportional variable hydraulic motor 801 to rotate forward, and the oil discharged from the reverse oil inlet B of the electro-hydraulic proportional variable hydraulic motor 801 passes through the supporting electro-hydraulic ball valve 804 and quick-discharge valve 805 It flows back to the tank and forms a back pressure at the valve port of the quick exhaust valve 805. As the downward speed of the press slider 5 increases, the back pressure of the quick exhaust valve 805 valve port rises. When the back pressure reaches a certain value, the press slider 5 The force is balanced and starts to descend at a constant speed; when the press slider 5 is quickly lowered, the hydraulic oil output by the electro-hydraulic proportional variable pump 811 enters the forward rotation inlet A of the electro-hydraulic proportional variable hydraulic motor 801 through the three-way electro-hydraulic reversing valve 808. If the hydraulic oil flow output by the electro-hydraulic proportional variable pump 811 is not enough to fill the rotation of the variable hydraulic motor 801, negative pressure will be formed at the positive rotation inlet A of the electro-hydraulic proportional variable hydraulic motor 801, and the hydraulic oil will flow from the hydraulic oil tank. The charge check valve 802 is sucked into the oil inlet A of the forward rotation of the electro-hydraulic proportional variable hydraulic motor 801.

2. The slide of the press moves down quickly for work advancement

At this stage, the supporting electro-hydraulic ball valve 804 and the three-way electro-hydraulic reversing valve 808 are in the energized state, and the two-way electro-hydraulic reversing valve 809 and the two-way solenoid valve 813 are in the de-energized state; the displacement of the electro-hydraulic proportional variable hydraulic motor 801 is gradually increasing The opening of the quick-discharge valve 805 gradually decreases, and the back pressure of the valve port of the quick-discharge valve 805 gradually increases, so the press slider 5 decelerates. When the press slider 5 descends to the working speed, it is fast The exhaust valve 805 is closed; the hydraulic oil output by the electro-hydraulic proportional variable pump 811 enters the forward rotation inlet A of the electro-hydraulic proportional variable hydraulic motor 801 through the three-way electro-hydraulic directional valve 808, and the electro-hydraulic proportional variable hydraulic motor 801 is in the electro-hydraulic proportion. The output flow of the variable pump 811 is driven to rotate forward; the oil discharged from the reverse oil inlet B of the electro-hydraulic proportional variable hydraulic motor 801 flows back to the oil tank through the supporting electro-hydraulic ball valve 804 and the back pressure relief valve 807, and is overflowed by the back pressure. The adjustment function of the flow valve 807 The pressure at the reverse oil inlet B of the electro-hydraulic proportional variable hydraulic motor 801 is stable; the working speed of the press slider 5 is adjusted by adjusting the electro-hydraulic proportional variable hydraulic motor 801 and the electro-hydraulic proportional variable pump 811 The displacement can be realized by constant speed control or constant power control according to actual process needs.

3. Keep pressure

When the pressing force reaches the set value, the pressure holding control can be performed. At this stage, the supporting electro-hydraulic ball valve 804 and the three-way electro-hydraulic reversing valve 808 are in the energized state, and the two-way electro-hydraulic reversing valve 809 and the two-way solenoid valve 813 are in the de-energized state. , The quick discharge valve 805 is in the closed state; the displacement of the electro-hydraulic proportional variable hydraulic motor 801 is kept constant, and the pressure at the forward rotation inlet A of the electro-hydraulic proportional variable hydraulic motor 801 is closed-loop controlled by the electro-hydraulic proportional variable pump 811, The pressure holding time is set according to the process requirements.

4. Pressure relief

When the pressure holding time reaches the set value, the three-way electro-hydraulic reversing valve 808 is in the energized state at this stage, and the supporting electro-hydraulic ball valve 804, the two-way electro-hydraulic reversing valve 809, and the two-way solenoid valve 813 are in the de-energized state. 805 is closed; the displacement of the electro-hydraulic proportional variable hydraulic motor 801 remains constant. Under the closed-loop control of the electro-hydraulic proportional variable pump 811, the pressure at the forward rotation inlet A of the electro-hydraulic proportional variable hydraulic motor 801 is set in advance The law of declining to zero.

5. Return stroke of the press slider

After the pressure relief is completed, the two-way electro-hydraulic reversing valve 809 is in the energized state, the supporting electro-hydraulic ball valve 804, the three-way electro-hydraulic reversing valve 808, and the two-way solenoid valve 813 are in the de-energized state, and the quick discharge valve 805 is in the closed state; The displacement of the proportional variable hydraulic motor 801 and the electro-hydraulic proportional variable pump 811 are matched and adjusted to meet the needs of the return speed of the press slider 5. The hydraulic oil output by the electro-hydraulic proportional variable pump 811 passes through the two-way electro-hydraulic directional valve 809 and supports the electro-hydraulic The ball valve 804 enters the reverse oil inlet B of the electro-hydraulic proportional variable hydraulic motor 801, the electro-hydraulic proportional variable hydraulic motor 801 is driven by the output flow of the electro-hydraulic proportional variable pump 811 to reverse, and the electro-hydraulic proportional variable hydraulic motor 801 rotates forward The hydraulic oil discharged from the oil inlet A flows back to the oil tank through the three-way electro-hydraulic reversing valve 808; the gear 1 and the electro-hydraulic proportional variable hydraulic motor 801 are coaxially reversed, and the press slider 5 is lifted up by the rack 2 to move upward.

During the operation of the press slider 5, part of the gravity of the assembly of the slider 5 is always offset by the force output by the balance cylinder 4; when the slider 5 descends, the hydraulic oil in the rodless cavity of the balance cylinder 4 enters the accumulator group 815, The pressure in the accumulator group 815 increases, and the gravitational potential energy is converted into hydraulic energy; when the slider 5 moves upward, the hydraulic oil in the accumulator group 815 enters the rodless chamber of the balance cylinder 4, and the pressure in the accumulator group 815 decreases, and the hydraulic energy Converted into gravitational potential energy. Because the leakage of the hydraulic system is inevitable, the pressure in the accumulator group 815 will decrease after long-term use. The two-way solenoid valve 813 can be energized to supplement the pressure of the accumulator group 815.

Claims

An open hydraulic pump-controlled motor-driven oscillating forging press, which is characterized in that it mainly includes: gear (1), rack (2), stop wheel (3), balance cylinder (4), sliding block (5) , The guide rail (6), the main frame (7), the electro-hydraulic system (8), the shaft of the gear (1) is installed on the upper plane of the upper beam of the main frame (7); the rack (2) is from the main frame (7) The upper beam passes through, and the lower end of the rack (2) is fixedly installed on the upper plane of the slider (5); the gear (1) meshes with the rack (2), and the lower slider (5) is driven up and down by the gear (1) Movement; the bearing of the retaining wheel (3) is fixedly installed on the upper plane of the upper beam of the main frame (7), the cylindrical surface of the retaining wheel (3) and the plane of the rack (2) form a friction pair; the balance cylinder (4) The cylinder body is fixedly installed on the upper beam of the main frame (7), the piston rod of the balance cylinder (4) is fixedly installed on the brackets on both sides of the sliding block (5); the sliding block (5) is placed on the inner side of the main frame (7) The guide rail (6) is fixedly installed on the left and right columns of the main frame (7), the guide rail (6) and the guide plate of the slider (5) form a plane friction pair; the main frame (7) is a closed frame; the electro-hydraulic system (8) ) Drive and control the gear (1) and the balance cylinder (4).
The open hydraulic pump-controlled motor-driven pendulum roller press according to claim 1, characterized in that: the electro-hydraulic system (8) further comprises: an electro-hydraulic proportional variable hydraulic motor (801), an oil supplement One-way valve (802), support safety valve (803), support electro-hydraulic ball valve (804), quick exhaust valve (805), suppression relief valve (806), back pressure relief valve (807), three-way electro-hydraulic exchange To valve (808), two-way electro-hydraulic reversing valve (809), system one-way valve (810), electro-hydraulic proportional variable pump (811), system overflow valve (812), two-way solenoid valve (813), storage Accumulator relief valve (814), accumulator group (815); the output shaft of the electro-hydraulic proportional variable hydraulic motor (801) is coaxially connected with the gear (1); the electro-hydraulic proportional variable hydraulic motor (801) rotates forward The oil inlet A is connected with the oil outlet of the charge check valve (802), the oil inlet of the pressure relief valve (806), and the A port of the three-way electro-hydraulic reversing valve (808); electro-hydraulic proportional variable hydraulic motor The reversal oil inlet B of (801) is connected with the oil inlet of the supporting safety valve (803) and the A port of the supporting electro-hydraulic ball valve (804); the P port of the supporting electro-hydraulic ball valve (804) is connected with the quick discharge valve (805) ) Port A, the oil inlet of the back pressure relief valve (807), and port A of the two-way electro-hydraulic reversing valve (809) are connected; the oil outlet of the system one-way valve (810) is connected to the three-way electro-hydraulic reversing valve (808), the P port of the two-way electro-hydraulic directional valve (809), the oil inlet of the system overflow valve (812), and the P port of the two-way solenoid valve (813) are connected; the electro-hydraulic proportional variable pump ( The oil outlet of 811) is connected to the oil inlet of the system one-way valve (810); the A port of the two-way solenoid valve (813) is connected to the oil inlet of the accumulator overflow valve (814) and the accumulator group ( The oil port of 815) and the rod cavity of the balance cylinder (4) are connected; the rodless cavity of the balance cylinder (4) is connected to the atmosphere; the oil inlet of the charge check valve (802) and the support safety valve (803) The oil outlet, the oil outlet of the quick discharge valve (805), the oil outlet of the suppression relief valve (806), the oil outlet of the back pressure relief valve (807), and the three-way electro-hydraulic directional valve (808) The T port, the oil suction port of the electro-hydraulic proportional variable pump (811), the oil outlet of the system overflow valve (812), and the oil outlet of the accumulator overflow valve (814) are in communication with the hydraulic oil tank.
The open hydraulic pump-controlled motor-driven pendulum roller press according to claim 1, characterized in that the stop wheel (3) is used to balance the lateral force received by the rack (2).
The open-type hydraulic pump-controlled motor-driven oscillating forging press according to claim 1, wherein the balance cylinder (4) is used to balance the gravity of the sliding block (5) assembly.
The open-type hydraulic pump-controlled motor-driven oscillating forging press according to claim 1, characterized in that: the guide rail (6) plays a role of guiding and supporting the sliding block (5).
An open hydraulic pump-controlled motor-driven oscillating roller press according to claim 1, characterized in that: the main frame (7) is a closed frame with a certain rigidity.
The open-type hydraulic pump-controlled motor-driven oscillating roller press according to claim 1, characterized in that: the electro-hydraulic system (8) is used to drive and control the gear (1) and the balance cylinder (4) exercise.