Multi-stage supercharging safety coupling hydraulic system of liquid-filling forming hydraulic machine
阅读说明：本技术 充液成型液压机的多级增压安全耦合液压系统 (Multi-stage supercharging safety coupling hydraulic system of liquid-filling forming hydraulic machine ) 是由 熊义 马冲 周汉英 于 2020-07-23 设计创作，主要内容包括：本发明公开了充液成型液压机的多级增压安全耦合液压系统,主要包括第一电磁插装阀、第一单向阀、第二电磁插装阀、第三电磁插装阀、第四电磁插装阀、第二单向阀、第五电磁插装阀、安全阀、调压插装阀、第三单向阀、第六电磁插装阀、第七电磁插装阀、第一单向插装阀、第二单向插装阀、第一压力传感器、第二压力传感器。本发明能够实现充液成型液压机滑块的多级速度增压,从而提高生产效率；同时具有多级支撑、多个安全耦合液压油路,提升了系统安全等级。(The invention discloses a multi-stage supercharging safety coupling hydraulic system of a liquid-filling forming hydraulic machine, which mainly comprises a first electromagnetic cartridge valve, a first one-way valve, a second electromagnetic cartridge valve, a third electromagnetic cartridge valve, a fourth electromagnetic cartridge valve, a second one-way valve, a fifth electromagnetic cartridge valve, a safety valve, a pressure-regulating cartridge valve, a third one-way valve, a sixth electromagnetic cartridge valve, a seventh electromagnetic cartridge valve, a first one-way cartridge valve, a second one-way cartridge valve, a first pressure sensor and a second pressure sensor. The invention can realize the multi-stage speed pressurization of the slide block of the hydraulic forming hydraulic press, thereby improving the production efficiency; meanwhile, the hydraulic coupling system is provided with a plurality of stages of supports and a plurality of safety coupling hydraulic oil ways, and the safety level of the system is improved.)
1. The multi-stage pressurizing safety coupling hydraulic system of the liquid filling forming hydraulic machine is characterized in that: the safety valve mainly comprises a first electromagnetic cartridge valve (1), a first one-way valve (2), a second electromagnetic cartridge valve (3), a third electromagnetic cartridge valve (4), a fourth electromagnetic cartridge valve (5), a second one-way valve (6), a fifth electromagnetic cartridge valve (7), a safety valve (8), a pressure regulating cartridge valve (9), a third one-way valve (10), a sixth electromagnetic cartridge valve (11), a seventh electromagnetic cartridge valve (12), a first one-way cartridge valve (13), a second one-way cartridge valve (14), a first pressure sensor (15) and a second pressure sensor (16); an oil source oil inlet PS is communicated with an opening A of a first electromagnetic cartridge valve (1), an oil inlet of a first one-way valve (2) and an opening A of a second electromagnetic cartridge valve (3), an oil outlet of the first one-way valve (2) is communicated with an opening P of a pilot electromagnetic valve of the first electromagnetic cartridge valve (1), an opening B of the second electromagnetic cartridge valve (3) is communicated with an opening A of a third electromagnetic cartridge valve (4) and an opening A of a fourth electromagnetic cartridge valve (5), an oil outlet of a pilot overflow valve of the third electromagnetic cartridge valve (4) is communicated with an opening A of a pilot electromagnetic valve of the first electromagnetic cartridge valve (1), an opening B of the fourth electromagnetic cartridge valve (5) is communicated with an oil inlet of the second one-way valve (6) and an opening A of a fifth electromagnetic cartridge valve (7), an oil outlet of the second one-way valve (6) is communicated with an opening P of a pilot electromagnetic valve of the fourth electromagnetic cartridge valve (5), an opening B of the fifth electromagnetic cartridge valve (7) is communicated with an oil inlet of a safety valve (8), A return oil port BC of a hydraulic cylinder is communicated, a port B of the first electromagnetic cartridge valve (1) is communicated with a port A of a pressure regulating cartridge valve (9), a port A of a sixth electromagnetic cartridge valve (11) and a port A of a seventh electromagnetic cartridge valve (12), an oil inlet of a third one-way valve (10) is communicated with a port X of the pressure regulating cartridge valve (9), an oil outlet of the third one-way valve (10) is communicated with a port B of a pilot electromagnetic valve of the fourth electromagnetic cartridge valve (5), a port B of the sixth electromagnetic cartridge valve (11) is communicated with a port B of the second one-way cartridge valve (14), a detection port of a first pressure sensor (15) and a primary hydraulic cylinder pressing oil port A1, a port B of the seventh electromagnetic cartridge valve (12) is communicated with a port A of the first one-way cartridge valve (13), and a port B of the first one-way cartridge valve (13) is communicated with a port A of the second one-way cartridge valve (14), a detection port of a second pressure sensor (16), And a pressing oil port A2 of the secondary hydraulic cylinder is communicated, and a hydraulic oil tank is communicated with a port B of the third electromagnetic cartridge valve (4), an oil outlet of the safety valve (8) and a port B of the pressure regulating cartridge valve (9).
2. The multi-stage boost safety coupling hydraulic system of an hydromechanical molding press as claimed in claim 1, wherein: the hydraulic system is set for the hydraulic cylinder control mode as follows:
a) the slide block is fast to move down: the pilot electromagnetic valves of the first electromagnetic cartridge valve (1), the third electromagnetic cartridge valve (4), the fourth electromagnetic cartridge valve (5) and the fifth electromagnetic cartridge valve (7) are electrified, and the pilot electromagnetic valves of the second electromagnetic cartridge valve (3), the sixth electromagnetic cartridge valve (11) and the seventh electromagnetic cartridge valve (12) are powered off; oil ports A to B of the first electromagnetic cartridge valve (1), the third electromagnetic cartridge valve (4) and the sixth electromagnetic cartridge valve (11) are in a conducting state, oil ports B to A of the fourth electromagnetic cartridge valve (5) and the fifth electromagnetic cartridge valve (7) are in a conducting state, and the second electromagnetic cartridge valve (3) and the seventh electromagnetic cartridge valve (12) are in a stopping state; hydraulic oil from an oil source enters from an oil port PS, passes through the first electromagnetic cartridge valve (1) and the sixth electromagnetic cartridge valve (11), enters an action cavity of the primary pressing hydraulic cylinder from an oil port A1, and an oil path entering the oil port A2 is cut off; hydraulic oil discharged from the action cavity of the return hydraulic cylinder enters an oil port BC and flows back to a hydraulic oil tank through a fifth electromagnetic cartridge valve (7), a fourth electromagnetic cartridge valve (5) and a third electromagnetic cartridge valve (4); the slide block is quickly lowered by self weight;
b) the first-stage working of the slide block is as follows: the pilot electromagnetic valves of the first electromagnetic cartridge valve (1), the fourth electromagnetic cartridge valve (5) and the fifth electromagnetic cartridge valve (7) are powered on, and the pilot electromagnetic valves of the second electromagnetic cartridge valve (3), the third electromagnetic cartridge valve (4), the sixth electromagnetic cartridge valve (11) and the seventh electromagnetic cartridge valve (12) are powered off; oil ports A to oil ports B of the first electromagnetic cartridge valve (1) and the sixth electromagnetic cartridge valve (11) are in a conducting state, the third electromagnetic cartridge valve (4) is in a pressure regulating state, oil ports B to oil ports A of the fourth electromagnetic cartridge valve (5) and the fifth electromagnetic cartridge valve (7) are in a conducting state, and the second electromagnetic cartridge valve (3) and the seventh electromagnetic cartridge valve (12) are in a stopping state; hydraulic oil from an oil source enters from an oil port PS, passes through the first electromagnetic cartridge valve (1) and the sixth electromagnetic cartridge valve (11), enters an action cavity of the primary pressing hydraulic cylinder from an oil port A1, and an oil path entering the oil port A2 is cut off; hydraulic oil discharged from the action cavity of the return hydraulic cylinder enters an oil port BC, flows back to a hydraulic oil tank through a fifth electromagnetic cartridge valve (7), a fourth electromagnetic cartridge valve (5) and a third electromagnetic cartridge valve (4), and adjusts the pressure of the action cavity of the return hydraulic cylinder through the third electromagnetic cartridge valve (4), so that supporting force is formed; the pressing pressure is adjusted by a pilot proportional overflow valve of the pressure-adjusting cartridge valve (9); the full flow of the hydraulic oil of the system enters an action cavity of a primary pressing hydraulic cylinder, and a sliding block works at the highest speed;
c) and (3) secondary feeding of the sliding block: when a first pressure sensor (15) detects that the primary pressing pressure reaches a set value, the pilot electromagnetic valves of the first electromagnetic cartridge valve (1), the fourth electromagnetic cartridge valve (5), the fifth electromagnetic cartridge valve (7) and the seventh electromagnetic cartridge valve (12) are powered on, and the pilot electromagnetic valves of the second electromagnetic cartridge valve (3), the third electromagnetic cartridge valve (4) and the sixth electromagnetic cartridge valve (11) are powered off; oil ports A to oil ports B of the first electromagnetic cartridge valve (1), the sixth electromagnetic cartridge valve (11) and the seventh electromagnetic cartridge valve (12) are in a conducting state, the third electromagnetic cartridge valve (4) is in a pressure regulating state, oil ports B to oil ports A of the fourth electromagnetic cartridge valve (5) and the fifth electromagnetic cartridge valve (7) are in a conducting state, and the second electromagnetic cartridge valve (3) is in a stopping state; hydraulic oil from an oil source enters from an oil port PS, because the sixth electromagnetic cartridge valve (11) and the first one-way cartridge valve (13) are in a one-way conduction state that the oil port A passes through the oil port B and the oil port B does not pass through the oil port A, the hydraulic oil preferentially enters the lower side of the pressures in the oil ports A1 and A2 after passing through the first electromagnetic cartridge valve (1), and after the pressures on the two sides are balanced, the hydraulic oil simultaneously enters the action cavities of the first-stage pressing hydraulic cylinder and the second-stage pressing hydraulic cylinder respectively from the sixth electromagnetic cartridge valve (11), the seventh electromagnetic cartridge valve (12) and the first one-way cartridge valve (13); hydraulic oil discharged from the action cavity of the return hydraulic cylinder enters an oil port BC, flows back to a hydraulic oil tank through a fifth electromagnetic cartridge valve (7), a fourth electromagnetic cartridge valve (5) and a third electromagnetic cartridge valve (4), and adjusts the pressure of the action cavity of the return hydraulic cylinder through the third electromagnetic cartridge valve (4), so that supporting force is formed; the pressing pressure is adjusted by a pilot proportional overflow valve of the pressure-adjusting cartridge valve (9); hydraulic oil of the system enters the action cavities of the first-stage pressing hydraulic cylinder and the second-stage pressing hydraulic cylinder at the same time, and the force increasing speed of the sliding block is the fastest;
d) and (3) returning the slide block: the pilot electromagnetic valve of the second electromagnetic cartridge valve (3) is electrified, and the pilot electromagnetic valves of the first electromagnetic cartridge valve (1), the third electromagnetic cartridge valve (4), the fourth electromagnetic cartridge valve (5), the fifth electromagnetic cartridge valve (7), the sixth electromagnetic cartridge valve (11) and the seventh electromagnetic cartridge valve (12) are powered off; oil ports A to oil ports B of the second electromagnetic cartridge valve (3), the fourth electromagnetic cartridge valve (5) and the fifth electromagnetic cartridge valve (7) are in a conducting state, the first electromagnetic cartridge valve (1) and the third electromagnetic cartridge valve (4) are in a stopping state, and the sixth electromagnetic cartridge valve (11) and the first one-way cartridge valve (13) are in a one-way stopping state that the oil ports B are not communicated with the oil ports A; hydraulic oil from an oil source enters from an oil port PS and enters a return hydraulic cylinder action cavity from an oil port BC through a second electromagnetic cartridge valve (3), a fourth electromagnetic cartridge valve (5) and a fifth electromagnetic cartridge valve (7); the hydraulic oil discharged from the action cavities of the first-stage pressing hydraulic cylinder and the second-stage pressing hydraulic cylinder flows back to the hydraulic oil tank through the liquid filling valve; the slide is lifted.
3. The multi-stage boost safety coupling hydraulic system of an hydromechanical forming press as claimed in claim 1 or 2, wherein: the hydraulic system has multi-stage safety support and oil circuit safety coupling:
a) the fourth electromagnetic cartridge valve (5) and the fifth electromagnetic cartridge valve (7) form a multi-stage safety support of a return hydraulic cylinder action cavity, and the safety support can be lost only when the two valves fail;
b) a fourth electromagnetic cartridge valve (5), a second one-way valve (6), a pressure regulating cartridge valve (9) and a third one-way valve (10) form a pressing safety coupling loop, pressure can be built only by the pressure regulating cartridge valve (9) when a pilot electromagnetic valve of the fourth electromagnetic cartridge valve (5) is electrified in the sliding block pressing process, and the pressing safety coupling loop avoids overpressure of a return action cavity and a pipeline during pressing;
c) the first electromagnetic cartridge valve (1), the first one-way valve (2) and the third electromagnetic cartridge valve (4) form a return safety coupling loop, an oil outlet of a pilot overflow valve of the third electromagnetic cartridge valve (4) is cut off in the return process of the sliding block, the third electromagnetic cartridge valve (4) is in a reliable cut-off state, the return safety coupling loop not only realizes the switching between the pressure during return of a return action cavity and the supporting pressure during pressing, but also reduces the risk of return stall caused by valve faults;
d) the sixth electromagnetic cartridge valve (11), the first one-way cartridge valve (13) and the second one-way cartridge valve (14) form an action cavity pressure balance safety coupling loop of the primary and secondary pressing hydraulic cylinders during pressurization and pressure relief, when the primary pressing is switched to the secondary pressing, the sixth electromagnetic cartridge valve (11) and the first one-way cartridge valve (13) are in a one-way conduction state of an oil opening A and an oil opening B, hydraulic oil preferentially enters the lower side of the pressure in the oil openings A1 and A2, meanwhile, hydraulic oil on the high-pressure side cannot be discharged back to the low-pressure side, and when the pressures on the two sides are balanced, the primary and secondary hydraulic cylinders are synchronously pressed; when pressure is relieved, a pilot electromagnetic valve of a sixth electromagnetic cartridge valve (11) is electrified, an oil port B of the sixth electromagnetic cartridge valve (11) is communicated with an oil port A, pressure relief pressure is adjusted by a pilot proportional overflow valve of a pressure adjusting cartridge valve (9), hydraulic oil in a working cavity of a second-stage pressing hydraulic cylinder is converged with hydraulic oil in a working cavity of a first-stage pressing hydraulic cylinder for pressure relief through a second one-way cartridge valve (14), synchronous pressure relief is realized, and overpressure of the working cavity of the hydraulic cylinder and a pipeline caused by desynchrony of pressure relief is avoided.
4. The multi-stage boost safety coupling hydraulic system of an hydromechanical forming press as claimed in claim 3, wherein: the multistage supercharging is not limited to two stages, and may be extended to multiple stages.
Technical Field
The invention relates to a hydraulic system of a liquid-filling forming hydraulic machine, in particular to a multi-stage supercharging safety coupling hydraulic system of the liquid-filling forming hydraulic machine.
Background
When the liquid-filling forming hydraulic machine works, the hydraulic machine is in a long-time die-closing pressure-maintaining state, and the improvement of the running speed of a sliding block before die closing and the pressurization speed after die closing is an effective means for improving the production efficiency; the mold is closed for a long time, and an ultrahigh pressure liquid medium for workpiece forming is filled in the mold, so that the reliability and stability of the system are particularly important for safe production.
Disclosure of Invention
The invention aims to provide a multi-stage supercharging safety coupling hydraulic system of a liquid-filling forming hydraulic machine, which can realize the supercharging of a multi-stage hydraulic cylinder so as to improve the production efficiency; meanwhile, an oil way for driving the hydraulic cylinder to act has multi-stage support and safe coupling, and the production safety is reliably guaranteed.
The technical scheme of the invention is as follows:
the invention mainly comprises a first electromagnetic cartridge valve, a first one-way valve, a second electromagnetic cartridge valve, a third electromagnetic cartridge valve, a fourth electromagnetic cartridge valve, a second one-way valve, a fifth electromagnetic cartridge valve, a safety valve, a pressure regulating cartridge valve, a third one-way valve, a sixth electromagnetic cartridge valve, a seventh electromagnetic cartridge valve, a first one-way cartridge valve, a second one-way cartridge valve, a first pressure sensor and a second pressure sensor; an oil source oil inlet PS is communicated with an opening A of a first electromagnetic cartridge valve, an oil inlet of a first one-way valve and an opening A of a second electromagnetic cartridge valve, an oil outlet of the first one-way valve is communicated with an opening P of a pilot electromagnetic valve of the first electromagnetic cartridge valve, an opening B of the second electromagnetic cartridge valve is communicated with an opening A of a third electromagnetic cartridge valve and an opening A of a fourth electromagnetic cartridge valve, an oil outlet of a pilot overflow valve of the third electromagnetic cartridge valve is communicated with an opening A of the pilot electromagnetic valve of the first electromagnetic cartridge valve, an opening B of the fourth electromagnetic cartridge valve is communicated with an oil inlet of the second one-way valve and an opening A of a fifth electromagnetic cartridge valve, an oil outlet of the second one-way valve is communicated with an opening P of a pilot electromagnetic valve of the fourth electromagnetic cartridge valve, an opening B of the fifth cartridge valve is communicated with an oil inlet of a safety valve and a hydraulic cylinder return oil port BC, and an opening B of the first electromagnetic cartridge valve is communicated with an opening A of a pressure regulating valve, An opening A of a seventh electromagnetic cartridge valve is communicated, an oil inlet of a third one-way valve is communicated with an opening X of the pressure regulating cartridge valve, an oil outlet of the third one-way valve is communicated with an opening B of a pilot electromagnetic valve of a fourth electromagnetic cartridge valve, an opening B of a sixth electromagnetic cartridge valve is communicated with an opening B of a second one-way cartridge valve, a detection opening of a first pressure sensor and a first-stage hydraulic cylinder pressing oil port A1, an opening B of the seventh electromagnetic cartridge valve is communicated with an opening A of the first one-way cartridge valve, an opening B of the first one-way cartridge valve is communicated with an opening A of the second one-way cartridge valve, a detection opening of a second pressure sensor and a second-stage hydraulic cylinder pressing oil port A2, and a hydraulic oil tank is communicated with an opening B of the third electromagnetic cartridge valve, an oil outlet of a safety valve and an.
Further, the hydraulic cylinder control mode of the multi-stage supercharging safety coupling hydraulic system of the hydraulic forming hydraulic machine is set as follows:
a) the slide block is fast to move down: the first electromagnetic cartridge valve, the third electromagnetic cartridge valve, the fourth electromagnetic cartridge valve and the fifth electromagnetic cartridge valve pilot electromagnetic valve are electrified, and the second electromagnetic cartridge valve, the sixth electromagnetic cartridge valve and the seventh electromagnetic cartridge valve pilot electromagnetic valve are powered off; oil ports A to B of the first electromagnetic cartridge valve, the third electromagnetic cartridge valve and the sixth electromagnetic cartridge valve are in a conducting state, oil ports B to A of the fourth electromagnetic cartridge valve and the fifth electromagnetic cartridge valve are in a conducting state, and the second electromagnetic cartridge valve and the seventh electromagnetic cartridge valve are in a stopping state; hydraulic oil from an oil source enters from an oil port PS, passes through a first electromagnetic cartridge valve and a sixth electromagnetic cartridge valve, enters an action cavity of the primary pressing hydraulic cylinder from an oil port A1, and an oil path entering an oil port A2 is cut off; and hydraulic oil discharged from the action cavity of the return hydraulic cylinder enters the oil port BC and flows back to the hydraulic oil tank through the fifth electromagnetic cartridge valve, the fourth electromagnetic cartridge valve and the third electromagnetic cartridge valve. The slide block is quickly lowered by self-weight.
b) The first-stage working of the slide block is as follows: the first electromagnetic cartridge valve, the fourth electromagnetic cartridge valve and the fifth electromagnetic cartridge valve pilot electromagnetic valve are electrified, and the second electromagnetic cartridge valve, the third electromagnetic cartridge valve, the sixth electromagnetic cartridge valve and the seventh electromagnetic cartridge valve pilot electromagnetic valve are powered off; oil ports A to B of the first electromagnetic cartridge valve and the sixth electromagnetic cartridge valve are in a conducting state, the third electromagnetic cartridge valve is in a pressure regulating state, oil ports B to A of the fourth electromagnetic cartridge valve and the fifth electromagnetic cartridge valve are in a conducting state, and the second electromagnetic cartridge valve and the seventh electromagnetic cartridge valve are in a stopping state; hydraulic oil from an oil source enters from an oil port PS, passes through a first electromagnetic cartridge valve and a sixth electromagnetic cartridge valve, enters an action cavity of the primary pressing hydraulic cylinder from an oil port A1, and an oil path entering an oil port A2 is cut off; hydraulic oil discharged from the action cavity of the return hydraulic cylinder enters an oil port BC, flows back to the hydraulic oil tank through a fifth electromagnetic cartridge valve, a fourth electromagnetic cartridge valve and a third electromagnetic cartridge valve, and adjusts the pressure of the action cavity of the return hydraulic cylinder through the third electromagnetic cartridge valve, so that supporting force is formed; the pressing pressure is regulated by a pilot proportional overflow valve of the pressure regulating cartridge valve. The hydraulic oil of the system enters the action cavity of the primary pressing hydraulic cylinder at full flow, and the slide block moves at the highest speed.
c) And (3) secondary feeding of the sliding block: when the first pressure sensor detects that the primary pressing pressure reaches a set value, the first electromagnetic cartridge valve, the fourth electromagnetic cartridge valve, the fifth electromagnetic cartridge valve and the seventh electromagnetic cartridge valve pilot electromagnetic valve are powered on, and the second electromagnetic cartridge valve, the third electromagnetic cartridge valve and the sixth electromagnetic cartridge valve pilot electromagnetic valve are powered off; oil ports A to B of the first electromagnetic cartridge valve, the sixth electromagnetic cartridge valve and the seventh electromagnetic cartridge valve are in a conducting state, the third electromagnetic cartridge valve is in a pressure regulating state, oil ports B to A of the fourth electromagnetic cartridge valve and the fifth electromagnetic cartridge valve are in a conducting state, and the second electromagnetic cartridge valve is in a stopping state; hydraulic oil from an oil source enters from the oil port PS, because the sixth electromagnetic cartridge valve and the first one-way cartridge valve are in a one-way conduction state that the oil port A passes through the oil port B and the oil port B does not pass through the oil port A, the hydraulic oil preferentially enters the lower side of the pressure in the oil ports A1 and A2 after passing through the first electromagnetic cartridge valve, and after the pressures of the two sides are balanced, the hydraulic oil simultaneously enters the action cavities of the primary pressing hydraulic cylinder and the secondary pressing hydraulic cylinder from the sixth electromagnetic cartridge valve, the seventh electromagnetic cartridge valve and the first one-way cartridge valve respectively; hydraulic oil discharged from the action cavity of the return hydraulic cylinder enters an oil port BC, flows back to the hydraulic oil tank through a fifth electromagnetic cartridge valve, a fourth electromagnetic cartridge valve and a third electromagnetic cartridge valve, and adjusts the pressure of the action cavity of the return hydraulic cylinder through the third electromagnetic cartridge valve, so that supporting force is formed; the pressing pressure is regulated by a pilot proportional overflow valve of the pressure regulating cartridge valve. The hydraulic oil of the system enters the action cavities of the first-stage pressing hydraulic cylinder and the second-stage pressing hydraulic cylinder at the same time, and the force increasing speed of the sliding block is the fastest.
d) And (3) returning the slide block: the pilot electromagnetic valve of the second electromagnetic cartridge valve is electrified, and the pilot electromagnetic valves of the first electromagnetic cartridge valve, the third electromagnetic cartridge valve, the fourth electromagnetic cartridge valve, the fifth electromagnetic cartridge valve, the sixth electromagnetic cartridge valve and the seventh electromagnetic cartridge valve are powered off; the oil ports A to B of the second electromagnetic cartridge valve, the fourth electromagnetic cartridge valve and the fifth electromagnetic cartridge valve are in a conducting state, the first electromagnetic cartridge valve and the third electromagnetic cartridge valve are in a stopping state, and the sixth electromagnetic cartridge valve and the first one-way cartridge valve are in a one-way stopping state that the oil port B is not communicated with the oil port A; hydraulic oil from an oil source enters from an oil port PS and enters a return hydraulic cylinder action cavity from an oil port BC through a second electromagnetic cartridge valve, a fourth electromagnetic cartridge valve and a fifth electromagnetic cartridge valve; the hydraulic oil discharged from the action chambers of the primary and secondary pressing hydraulic cylinders flows back to the hydraulic oil tank through the charge valve. The slide is lifted.
Furthermore, the invention relates to a multi-stage supercharging safety coupling hydraulic system of a hydraulic forming hydraulic machine, which is characterized in that: the hydraulic system has multi-stage safety support and oil circuit safety coupling:
a) the fourth electromagnetic cartridge valve and the fifth electromagnetic cartridge valve form a multi-stage safety support of a return hydraulic cylinder acting cavity, and the safety support can be lost only when the two valves fail.
b) The fourth electromagnetic cartridge valve, the second one-way valve, the pressure regulating cartridge valve and the third one-way valve form a pressing safety coupling loop, pressure can be built only by the pressure regulating cartridge valve when a pilot electromagnetic valve of the fourth electromagnetic cartridge valve is electrified in the sliding block pressing process, and the pressing safety coupling loop avoids overpressure of a return action cavity and a pipeline in pressing.
c) The first electromagnetic cartridge valve, the first one-way valve and the third electromagnetic cartridge valve form a return safety coupling loop, the oil outlet of a pilot overflow valve of the third electromagnetic cartridge valve is cut off in the return process of the sliding block, the third electromagnetic cartridge valve is in a reliable cut-off state, the return safety coupling loop not only realizes the switching between the return pressure of the return action cavity and the support pressure during pressing, but also reduces the risk of return stall caused by valve faults.
d) The sixth electromagnetic cartridge valve, the first one-way cartridge valve and the second one-way cartridge valve form an action cavity pressure balance safety coupling loop of the primary and secondary pressing hydraulic cylinders during pressurization and pressure relief, when the primary pressing is switched into the secondary pressing, the sixth electromagnetic cartridge valve and the first one-way cartridge valve are in a one-way conduction state of an oil opening A and an oil opening B, hydraulic oil preferentially enters one side of the oil openings A1 and A2, the hydraulic oil on the high-pressure side cannot be reversely released to the low-pressure side, and the primary and secondary hydraulic cylinders are synchronously pressed after the pressures on the two sides are balanced; when pressure is relieved, the pilot electromagnetic valve of the sixth electromagnetic cartridge valve is electrified, the oil port B of the sixth electromagnetic cartridge valve is communicated with the oil port A, the pilot proportional overflow valve of the pressure regulating cartridge valve regulates pressure relief, hydraulic oil in the action cavity of the second-stage pressing hydraulic cylinder flows together with hydraulic oil in the action cavity of the first-stage pressing hydraulic cylinder through the second one-way cartridge valve for pressure relief, synchronous pressure relief is realized, and overpressure of the action cavity of the hydraulic cylinder and a pipeline caused by desynchrony pressure relief is avoided.
The above multistage supercharging technology is not limited to two stages, and can be extended to multiple stages.
The invention has the following beneficial effects:
1. the multi-stage pressurization principle of the invention realizes the gradual increase and synchronous pressure relief of the pressing force, the pressure in the hydraulic cylinder action cavity is automatically balanced without impact when switching and relieving at all stages, and the system is safe, reliable and efficient.
2. The oil circuit of the hydraulic system has a plurality of action association couplings, and has reliable safety guarantee in each working process of quick falling, pressing, return stroke, hovering and the like of the sliding block.
Drawings
Fig. 1 is a schematic diagram of a hydraulic system of the present invention.
FIG. 2 is a schematic diagram of an embodiment of the present invention.
In fig. 1: 1-a first electromagnetic cartridge valve, 2-a first one-way valve, 3-a second electromagnetic cartridge valve, 4-a third electromagnetic cartridge valve, 5-a fourth electromagnetic cartridge valve, 6-a second one-way valve, 7-a fifth electromagnetic cartridge valve, 8-a safety valve, 9-a pressure regulating cartridge valve, 10-a third one-way valve, 11-a sixth electromagnetic cartridge valve, 12-a seventh electromagnetic cartridge valve, 13-a first one-way cartridge valve, 14-a second one-way cartridge valve, 15-a first pressure sensor and 16-a second pressure sensor.
In fig. 2: 201-side cylinder, 202-master cylinder, 203-charge valve, 204-slide, 205-oil source.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, the present invention mainly comprises: the system comprises a first electromagnetic cartridge valve 1, a first one-way valve 2, a second electromagnetic cartridge valve 3, a third electromagnetic cartridge valve 4, a fourth electromagnetic cartridge valve 5, a second one-way valve 6, a fifth electromagnetic cartridge valve 7, a safety valve 8, a pressure regulating cartridge valve 9, a third one-way valve 10, a sixth electromagnetic cartridge valve 11, a seventh electromagnetic cartridge valve 12, a first one-
Referring to fig. 2, the multistage supercharging safety coupling hydraulic system of the hydraulic forming hydraulic machine of the invention has the following control modes:
a) the slider 204 is fast down: the pilot electromagnetic valves of the first electromagnetic cartridge valve 1, the third electromagnetic cartridge valve 4, the fourth electromagnetic cartridge valve 5 and the fifth electromagnetic cartridge valve 7 are electrified, and the pilot electromagnetic valves of the second electromagnetic cartridge valve 3, the sixth electromagnetic cartridge valve 11 and the seventh electromagnetic cartridge valve 12 are powered off; the oil ports A to B of the first electromagnetic cartridge valve 1, the third electromagnetic cartridge valve 4 and the sixth electromagnetic cartridge valve 11 are in a conducting state, the oil ports B to A of the fourth electromagnetic cartridge valve 5 and the fifth electromagnetic cartridge valve 7 are in a conducting state, and the second electromagnetic cartridge valve 3 and the seventh electromagnetic cartridge valve 12 are in a stopping state; hydraulic oil from the oil source 205 enters from the oil port PS, passes through the first electromagnetic cartridge valve 1 and the sixth electromagnetic cartridge valve 11, enters the rodless cavity of the side cylinder 201 from the oil port a1, and the oil path entering the oil port a2 is cut off; the hydraulic oil discharged from the rod cavity of the side cylinder 201 enters the oil port BC and flows back to the hydraulic oil tank through the fifth electromagnetic cartridge valve 7, the fourth electromagnetic cartridge valve 5 and the third electromagnetic cartridge valve 4. The slider 204 is rapidly lowered by its own weight.
b) The first-stage working of the sliding block 204 is as follows: the pilot electromagnetic valves of the first electromagnetic cartridge valve 1, the fourth electromagnetic cartridge valve 5 and the fifth electromagnetic cartridge valve 7 are electrified, and the pilot electromagnetic valves of the second electromagnetic cartridge valve 3, the third electromagnetic cartridge valve 4, the sixth electromagnetic cartridge valve 11 and the seventh electromagnetic cartridge valve 12 are powered off; the oil ports A to B of the first electromagnetic cartridge valve 1 and the sixth electromagnetic cartridge valve 11 are in a conducting state, the third electromagnetic cartridge valve 4 is in a pressure regulating state, the oil ports B to A of the fourth electromagnetic cartridge valve 5 and the fifth electromagnetic cartridge valve 7 are in a conducting state, and the second electromagnetic cartridge valve 3 and the seventh electromagnetic cartridge valve 12 are in a stopping state; hydraulic oil from the oil source 205 enters from the oil port PS, passes through the first electromagnetic cartridge valve 1 and the sixth electromagnetic cartridge valve 11, enters the rodless cavity of the side cylinder 201 from the oil port a1, and the oil path entering the oil port a2 is cut off; hydraulic oil discharged from a rod cavity of the side cylinder 201 enters an oil port BC, flows back to a hydraulic oil tank through a fifth electromagnetic cartridge valve 7, a fourth electromagnetic cartridge valve 5 and a third electromagnetic cartridge valve 4, and adjusts the pressure of the rod cavity of the side cylinder 201 through the third electromagnetic cartridge valve 4, so that supporting force is formed; the pressing pressure is set by a pilot proportional overflow valve of the pressure regulating cartridge valve 9. The system hydraulic oil enters the rodless cavity of the side cylinder 201 at full flow, and the slide block 204 moves at the highest speed.
c) And (3) secondary feeding of the sliding block 204: when the first pressure sensor 15 detects that the pressure of the rodless cavity of the side cylinder 201 reaches a set value, the first electromagnetic cartridge valve 1, the fourth electromagnetic cartridge valve 5, the fifth electromagnetic cartridge valve 7 and the seventh electromagnetic cartridge valve 12 pilot electromagnetic valves are electrified, and the second electromagnetic cartridge valve 3, the third electromagnetic cartridge valve 4 and the sixth electromagnetic cartridge valve 11 pilot electromagnetic valves are deenergized; the oil ports A to B of the first electromagnetic cartridge valve 1, the sixth electromagnetic cartridge valve 11 and the seventh electromagnetic cartridge valve 12 are in a conducting state, the third electromagnetic cartridge valve 4 is in a pressure regulating state, the oil ports B to A of the fourth electromagnetic cartridge valve 5 and the fifth electromagnetic cartridge valve 7 are in a conducting state, and the second electromagnetic cartridge valve 3 is in a stopping state; hydraulic oil from the oil source 205 enters from the oil port PS, because the sixth electromagnetic cartridge valve 11 and the first one-
d) And (3) returning the sliding block 204: a pilot electromagnetic valve of the second electromagnetic cartridge valve 3 is electrified, and pilot electromagnetic valves of the first electromagnetic cartridge valve 1, the third electromagnetic cartridge valve 4, the fourth electromagnetic cartridge valve 5, the fifth electromagnetic cartridge valve 7, the sixth electromagnetic cartridge valve 11 and the seventh electromagnetic cartridge valve 12 are powered off; the oil ports A to B of the second electromagnetic cartridge valve 3, the fourth electromagnetic cartridge valve 5 and the fifth electromagnetic cartridge valve 7 are in a conducting state, the first electromagnetic cartridge valve 1 and the third electromagnetic cartridge valve 4 are in a stopping state, and the sixth electromagnetic cartridge valve 11 and the first one-
The multi-stage supercharging safety coupling hydraulic system of the hydraulic forming hydraulic machine has the following advantages that:
a) the fourth electromagnetic cartridge valve 5 and the fifth electromagnetic cartridge valve 7 form a multi-stage safety support with a rod cavity of the side cylinder 201, and the hydraulic press sliding block 204 can lose the safety support only when the two valves fail.
b) The fourth electromagnetic cartridge valve 5, the second one-way valve 6, the pressure regulating cartridge valve 9 and the third one-way valve 10 form a pressing safety coupling loop, pressure can be built only when a pilot electromagnetic valve of the fourth electromagnetic cartridge valve 5 is electrified in the pressing process of the sliding block 204, and overpressure of a rod cavity and a pipeline of the side cylinder 201 is avoided in the pressing safety coupling loop.
c) The first electromagnetic cartridge valve 1, the first one-way valve 2 and the third electromagnetic cartridge valve 4 form a return safety coupling loop, the oil outlet of a pilot overflow valve of the third electromagnetic cartridge valve 4 is cut off in the return process of the slider 204, the third electromagnetic cartridge valve 4 is in a reliable cut-off state, the return safety coupling loop not only realizes the switching between the pressure of the rod cavity of the side cylinder 201 in the return process and the supporting pressure in the pressing process, but also reduces the risk of return stall caused by valve faults.
d) The sixth electromagnetic cartridge valve 11, the first one-
The above multistage supercharging technology is not limited to two stages, and can be extended to multiple stages.
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