CN105109079B - A kind of ultrahigh speed big stroke large-tonnage punch press hydraulic system and method for work thereof - Google Patents
A kind of ultrahigh speed big stroke large-tonnage punch press hydraulic system and method for work thereof Download PDFInfo
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- 239000003921 oil Substances 0.000 claims description 71
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Abstract
本发明公开了一种超高速大行程大吨位冲床液压系统及其工作方法。现有的冲床冲压频率一般在500次/分以下，且冲压力低、冲床行程小。本发明包括主油箱、过滤器、液压泵、溢流阀I、蓄能器I、减压阀、单向阀、蓄能器Ⅱ、第一二位二通高速液控切换阀、二位五通液控切换阀、第二二位二通液控切换阀、溢流阀Ⅱ、高速大吨位液压缸、液压先导分配阀、电‑机械转换器。本发明切换频率1000次/分、液压冲击力125T、行程5‑50mm可调，其性能比机械式冲床、传统液压冲床优越，满足厚板料、深拉伸和滚压等生产加工的需要，具有噪音低、发热低、节能等优点，提高生产效率。
The invention discloses an ultra-high-speed, large-stroke, and large-tonnage press hydraulic system and a working method thereof. The punching frequency of the existing punching machine is generally below 500 times/min, and the punching force is low and the stroke of the punching machine is small. The invention includes a main oil tank, a filter, a hydraulic pump, an overflow valve I, an accumulator I, a pressure reducing valve, a one-way valve, an accumulator II, a first two-position two-way high-speed hydraulic control switching valve, a two-position five Through hydraulic control switching valve, 2nd 2-position 2-way hydraulic control switching valve, relief valve II, high-speed large-tonnage hydraulic cylinder, hydraulic pilot distribution valve, electro-mechanical converter. The switching frequency of the present invention is 1000 times/min, the hydraulic impact force is 125T, and the stroke is adjustable from 5-50mm. Its performance is superior to mechanical punching machines and traditional hydraulic punching machines, and it can meet the production and processing needs of thick sheet metal, deep drawing and rolling, etc. It has the advantages of low noise, low heat generation, energy saving, etc., and improves production efficiency.
Description
技术领域 technical field
本发明属于机电装备领域，具体涉及一种超高速大行程大吨位冲床液压系统及其工作方法。 The invention belongs to the field of electromechanical equipment, and in particular relates to an ultra-high-speed, large-stroke, and large-tonnage press hydraulic system and a working method thereof.
背景技术 Background technique
冲床是进行冲压加工的主要机床之一，按照主传动的类型可分为机械式冲床和液压式冲床，广泛应用于汽车工业、农业机械、家用电器、电子仪表、国防工业以及日用品等生产部门，近年来，生产行业对冲床等设备的性能指标提出了更高的要求，如设备应具有更高的生产效率和可靠性。 Punch presses are one of the main machine tools for stamping processing. According to the type of main drive, they can be divided into mechanical punch presses and hydraulic punch presses. They are widely used in the production departments of automobile industry, agricultural machinery, household appliances, electronic instruments, national defense industry and daily necessities. In recent years, the production industry has put forward higher requirements for the performance indicators of punching machines and other equipment, such as equipment should have higher production efficiency and reliability.
液压式冲床的液压系统是其核心部分。国内独立生产的液压冲床大都是结构简单、自动化程度不高的产品，比较完善的高速冲床在国内起步较晚，冲压频率一般在500次/分以下，与国外先进水平相比存在很大差距，而且所用液压系统依赖国外进口，成本很高，不适合我国目前经济发展状况。同时，国外比较著名的液压冲床生产厂商的产品特点是冲压频率较高，但冲压力低、冲床行程小，冲床的适用面就很窄，仅用于薄片的冲压，无法满足厚板料、深拉伸和滚压等生产加工的需要。如果要提高行程，扩大冲压件的适用范围，冲压频率就大幅下降。 The hydraulic system of the hydraulic press is its core part. Most of the hydraulic punches produced independently in China are simple in structure and low in automation. The relatively complete high-speed punches started late in China, and the punching frequency is generally below 500 times/min. Compared with foreign advanced levels, there is a big gap. Moreover, the hydraulic system used depends on foreign imports, and the cost is very high, which is not suitable for the current economic development status of our country. At the same time, the products of well-known foreign manufacturers of hydraulic punching machines are characterized by high punching frequency, but the punching force is low, the stroke of the punching machine is small, and the applicable surface of the punching machine is very narrow. The needs of production and processing such as stretching and rolling. If it is necessary to increase the stroke and expand the application range of stamping parts, the frequency of stamping will be greatly reduced.
发明内容 Contents of the invention
本发明的目的是设计出一种超高速大行程大吨位液压冲床的液压系统，使冲床具有冲压频率1000次/分、行程5-50mm可调、冲压力达125T等性能，解决现有冲压频率、冲压力和冲床行程不能同时高的问题，满足厚板料、深拉伸和滚压等生产加工的需要。 The purpose of the present invention is to design a hydraulic system for an ultra-high-speed, large-stroke, and large-tonnage hydraulic punching machine, so that the punching machine has the properties of a punching frequency of 1000 times/min, an adjustable stroke of 5-50mm, and a punching force of 125T, so as to solve the problem of the existing punching frequency. , The punching force and the stroke of the punching machine cannot be high at the same time, which meets the needs of production and processing of thick sheet materials, deep drawing and rolling.
本发明解决技术问题采用的技术方案是： The technical scheme that the present invention solves technical problem adopts is:
所述的超高速大行程大吨位液压冲床的液压系统主要包括主油箱、过滤器、液压泵、溢流阀I、蓄能器I、减压阀、单向阀、蓄能器Ⅱ、第一二位二通高速液控切换阀、二位五通液控切换阀、第二二位二通液控切换阀、溢流阀Ⅱ、高速大吨位液压缸、液压先导分配阀、电-机械转换器。 The hydraulic system of the ultra-high-speed, large-stroke, and large-tonnage hydraulic press mainly includes a main oil tank, a filter, a hydraulic pump, an overflow valve I, an accumulator I, a pressure reducing valve, a one-way valve, an accumulator II, a first Two-position two-way high-speed hydraulic control switching valve, two-position five-way hydraulic control switching valve, second two-position two-way hydraulic control switching valve, overflow valve II, high-speed large-tonnage hydraulic cylinder, hydraulic pilot distribution valve, electro-mechanical conversion device.
所述的主油箱与过滤器的进油口连接，过滤器的出油口与液压泵的进油口连接，液压泵的出油口分别与溢流阀I的进油口、蓄能器I的进油口、减压阀的进油口、二位五通液控切换阀的A口、第二二位二通液控切换阀的A口连接，减压阀的出油口与单向阀的进油口连接，单向阀的出油口分别与蓄能器Ⅱ、第一二位二通高速液控切换阀的A口连接，第一二位二通液控高速切换阀的B口与高速大吨位液压缸上腔的B口连接，第二二位二通液控切换阀的B口与高速大吨位液压缸上腔的C口连接，二位五通液控切换阀的D口与高速大吨位液压缸上腔的A口连接，二位五通液控切换阀的E口与高速大吨位液压缸下腔连接，二位五通液控切换阀的C口与溢流阀Ⅱ的进油口连接，溢流阀I的出油口、溢流阀Ⅱ的出油口和二位五通液控切换阀的B口与主油箱连接。 The main oil tank is connected with the oil inlet of the filter, the oil outlet of the filter is connected with the oil inlet of the hydraulic pump, and the oil outlet of the hydraulic pump is respectively connected with the oil inlet of the relief valve 1 and the accumulator I The oil inlet of the pressure reducing valve, the A port of the two-position five-way hydraulic control switching valve, and the A port of the second two-position two-way hydraulic control switching valve are connected, and the oil outlet of the pressure reducing valve is connected with the one-way The oil inlet port of the valve is connected, the oil outlet port of the check valve is respectively connected with the accumulator II, the A port of the first two-position two-way high-speed hydraulic control switching valve, and the B port of the first two-position two-way hydraulic control high-speed switching valve The port is connected to the B port of the upper cavity of the high-speed large-tonnage hydraulic cylinder, the B port of the second two-position two-way hydraulic control switching valve is connected to the C port of the high-speed large-tonnage hydraulic cylinder upper cavity, and the D port of the two-position five-way hydraulic control switching valve The port is connected to the A port of the upper cavity of the high-speed large-tonnage hydraulic cylinder, the E port of the two-position five-way hydraulic control switching valve is connected to the lower cavity of the high-speed large-tonnage hydraulic cylinder, and the C port of the two-position five-way hydraulic control switching valve is connected to the overflow valve The oil inlet port of II is connected, the oil outlet port of overflow valve I, the oil outlet port of overflow valve II and the B port of the two-position five-way hydraulic control switching valve are connected with the main oil tank.
所述的液压泵可排出压力油，为系统提供液压能。所述的溢流阀I用来限制系统的最高压力。所述的蓄能器I用来减少系统振动。所述的减压阀将高压油减压为低压油，进入单向阀。所述的单向阀用于确保低压油液只能从减压阀出口流向第一二位二通高速切换阀，而不能反向流动。所述的电-机械转换器采用螺管式，湿式耐高压衔铁驱动机构，能准确的将数控装置发出的电信号指令转变成机械信号。液压先导分配阀采用滑阀结构，能准确的将机械信号转变成压力信号，用以控制第一二位二通高速液控切换阀、二位五通液控切换阀、第二二位二通液控切换阀的工作。所述的第一、第二二位二通高速液控切换阀采用将插装阀和滑阀相结合的结构，即利用插装阀过流能力大，滑阀功耗小的优点。所述的高速大吨位液压缸采用聚四氟乙烯的耐磨环，避免活塞与缸体和活塞杆与端盖间的金属与金属摩擦，并采用复合式密封圈如格兰圈、斯特封等高压低摩擦的密封圈，确保低摩擦，液压缸进出油快，进出油液阻小，频响高，无泄漏。 The hydraulic pump can discharge pressure oil to provide hydraulic energy for the system. The overflow valve I is used to limit the maximum pressure of the system. Described accumulator 1 is used for reducing system vibration. The pressure-reducing valve decompresses the high-pressure oil into low-pressure oil, which enters the one-way valve. The one-way valve is used to ensure that the low-pressure oil can only flow from the outlet of the pressure reducing valve to the first two-position two-way high-speed switching valve, and cannot flow in the opposite direction. The electric-mechanical converter adopts a spiral tube type, wet-type high-voltage resistant armature drive mechanism, which can accurately convert the electrical signal command sent by the numerical control device into a mechanical signal. The hydraulic pilot distribution valve adopts a slide valve structure, which can accurately convert mechanical signals into pressure signals, and is used to control the first two-position two-way high-speed hydraulic control switching valve, two-position five-way hydraulic control switching valve, the second two-position two-way The operation of the hydraulic control switching valve. The first and second two-position two-way high-speed hydraulic control switching valves adopt a structure combining a cartridge valve and a slide valve, that is, to utilize the advantages of large flow capacity of the cartridge valve and low power consumption of the slide valve. The high-speed and large-tonnage hydraulic cylinder adopts a polytetrafluoroethylene wear-resistant ring to avoid metal-to-metal friction between the piston and the cylinder body and the piston rod and the end cover, and adopts a composite sealing ring such as a Gland ring, a Ster seal High-pressure and low-friction sealing rings ensure low friction, fast oil in and out of the hydraulic cylinder, small resistance to oil in and out, high frequency response, and no leakage.
上述液压系统工作过程是：数控装置发出指令信号（电信号）驱动电-机械转换器工作，电-机械转换器将指令信号转变成机械信号，并驱动液压先导分配阀工作，液压先导分配阀按序输出3路油压信号，即油压信号Ⅰ、油压信号Ⅱ、油压信号Ⅲ，油压信号Ⅰ控制二位五通液控切换阀的工作，油压信号Ⅱ控制第一二位二通高速液控切换阀的工作，油压信号Ⅲ控制第二二位二通液控切换阀的工作。高速大吨位液压缸向下快进时，此时第一二位二通高速液控切换阀打开，21MPa的高压油从主油箱中，依次通过过滤器、液压泵、减压阀（减压为1MPa）、单向阀、第一二位二通高速液控切换阀，进入高速大吨位液压缸的上腔，待高速大吨位液压缸下降到被冲工件，第二二位二通液控切换阀打开，同时第一二位二通高速液控切换阀关闭，21MPa的高压油从主油箱中，依次通过过滤器、液压泵、第二二位二通液控切换阀，进入高速大吨位液压缸上腔，开始冲压工件。冲压完成后高速大吨位液压缸向上快退，此时二位五通液控切换阀、第一二位二通高速液控切换阀打开，同时第二二位二通液控切换阀关闭，21MPa的高压油从主油箱中，依次通过过滤器、液压泵、二位五通液控切换阀，进入高速大吨位液压缸的下腔，高速大吨位液压缸上腔中的液压油一部分通过二位五通液控切换阀、溢流阀Ⅱ，进入主油箱，另一部分通过第一二位二通高速液控切换阀，进入蓄能器Ⅱ。快退完成后，完成一次冲压，然后液压先导分配阀再次按序输出油压信号，通过控制第一二位二通高速液控切换阀、二位五通液控切换阀、第二二位二通液控切换阀，使高速大吨位液压缸再次动作，完成冲压工作。 The working process of the above-mentioned hydraulic system is: the numerical control device sends out a command signal (electrical signal) to drive the electric-mechanical converter to work, the electric-mechanical converter converts the command signal into a mechanical signal, and drives the hydraulic pilot distribution valve to work, and the hydraulic pilot distribution valve presses Sequentially output 3 oil pressure signals, namely oil pressure signal Ⅰ, oil pressure signal Ⅱ, oil pressure signal Ⅲ, oil pressure signal Ⅰ controls the work of the two-position five-way hydraulic control switching valve, oil pressure signal Ⅱ controls the first two-position two Through the work of the high-speed hydraulic control switching valve, the oil pressure signal III controls the work of the second two-position two-way hydraulic control switching valve. When the high-speed large-tonnage hydraulic cylinder moves downward fast, the first two-position two-way high-speed hydraulic control switching valve is opened at this time, and the 21MPa high-pressure oil passes through the filter, hydraulic pump, and pressure reducing valve in sequence from the main oil tank (the pressure is reduced to 1MPa), one-way valve, the first two-position two-way high-speed hydraulic control switch valve, enter the upper chamber of the high-speed large-tonnage hydraulic cylinder, when the high-speed large-tonnage hydraulic cylinder descends to the workpiece to be washed, the second two-position two-way hydraulic control switch The valve is opened, and at the same time the first, two, two-way high-speed hydraulic control switching valve is closed, and the 21MPa high-pressure oil passes through the filter, the hydraulic pump, and the second, two-position, two-way hydraulic control switching valve from the main oil tank in sequence, and enters the high-speed large-tonnage hydraulic The upper cavity of the cylinder starts to stamp the workpiece. After the stamping is completed, the high-speed and large-tonnage hydraulic cylinder moves upwards quickly. At this time, the two-position five-way hydraulic control switching valve, the first two-position two-way high-speed hydraulic control switching valve are opened, and the second two-position two-way hydraulic control switching valve is closed at the same time, 21MPa The high-pressure oil enters the lower chamber of the high-speed large-tonnage hydraulic cylinder through the filter, hydraulic pump, and two-position five-way hydraulic control switching valve in turn from the main oil tank, and part of the hydraulic oil in the upper chamber of the high-speed large-tonnage hydraulic cylinder passes through the two-position The five-way hydraulic control switching valve and overflow valve II enter the main oil tank, and the other part enters the accumulator II through the first two-position two-way high-speed hydraulic control switching valve. After the fast rewind is completed, a stamping is completed, and then the hydraulic pilot distribution valve outputs the oil pressure signal in sequence again, by controlling the first two-position two-way high-speed hydraulic control switching valve, the two-position five-way hydraulic control switching valve, the second two-position two-way Through the hydraulic control switching valve, the high-speed and large-tonnage hydraulic cylinder moves again to complete the stamping work.
本发明具有的性能及优点是： The performance and advantage that the present invention has are:
1、超高速大行程大吨位液压冲床的液压系统切换频率1000次/分、液压冲击力125T、行程5-50mm可调，其性能比机械式冲床、传统液压冲床优越，满足厚板料、深拉伸和滚压等生产加工的需要，具有噪音低、发热低、节能等优点，提高生产效率。 1. The switching frequency of the hydraulic system of the ultra-high-speed, large-stroke, and large-tonnage hydraulic punching machine is 1000 times/min, the hydraulic impact force is 125T, and the stroke is adjustable from 5 to 50mm. Its performance is superior to mechanical punching machines and traditional hydraulic punching machines. It has the advantages of low noise, low heat generation, energy saving, etc., and improves production efficiency.
2、超高速大行程大吨位液压冲床液压系统中的二位二通高速液控切换阀，采用插装阀和滑阀相结合的方法设计，功耗＜1kw，流量＞10000升/分，切换频率≥1000次/分，保证整套液压系统的性能要求。 2. The two-position two-way high-speed hydraulic control switching valve in the hydraulic system of the ultra-high-speed, large-stroke, and large-tonnage hydraulic press is designed by combining a cartridge valve and a slide valve. Frequency ≥ 1000 times/min, to ensure the performance requirements of the entire hydraulic system.
3、超高速大行程大吨位液压冲床液压系统中的电-机械械转换器及液压先导分配阀稳态控制精度高、动态响应性能高、抗干扰能力强，保证每次冲压加工在60ms内完成。 3. The electro-mechanical converter and hydraulic pilot distribution valve in the hydraulic system of ultra-high-speed, large-stroke, and large-tonnage hydraulic presses have high steady-state control accuracy, high dynamic response performance, and strong anti-interference ability, ensuring that each stamping process can be completed within 60ms .
附图说明 Description of drawings
图1为超高速大行程大吨位液压冲床的液压系统图； Figure 1 is a hydraulic system diagram of an ultra-high-speed, large-stroke, and large-tonnage hydraulic press;
图中：1-主油箱，2-过滤器，3-液压泵，4-溢流阀I，5-蓄能器I，6-减压阀，7-单向阀，8-蓄能器Ⅱ，9-二位二通高速液控切换阀，10-电-机械转换器，11-液压先导分配阀，12-二位五通液控切换阀，13-溢流阀Ⅱ，14-高速大吨位液压缸，14-1-高速大吨位液压缸上腔，14-2-高速大吨位液压缸下腔，15-二位二通液控切换阀。 In the figure: 1-main oil tank, 2-filter, 3-hydraulic pump, 4-relief valve I, 5-accumulator I, 6-pressure reducing valve, 7-one-way valve, 8-accumulator II , 9-two-position two-way high-speed hydraulic control switching valve, 10-electric-mechanical converter, 11-hydraulic pilot distribution valve, 12-two-position five-way hydraulic control switching valve, 13-relief valve II, 14-high speed large Tonnage hydraulic cylinder, 14-1-high-speed large-tonnage hydraulic cylinder upper chamber, 14-2-high-speed large-tonnage hydraulic cylinder lower chamber, 15-two-position two-way hydraulic control switching valve.
具体实施方式 detailed description
如图1所示，本实施例超高速大行程大吨位液压冲床的液压系统由主油箱1、过滤器2、液压泵3、溢流阀I4、蓄能器I5、减压阀6、单向阀7、蓄能器Ⅱ8、二位二通高速液控切换阀9、二位五通液控切换阀12、二位二通液控切换阀15、溢流阀Ⅱ13、高速大吨位液压缸14、液压先导分配阀11、电-机械转换器10等组成。 As shown in Figure 1, the hydraulic system of the ultra-high-speed, large-stroke, and large-tonnage hydraulic press in this embodiment consists of a main oil tank 1, a filter 2, a hydraulic pump 3, an overflow valve I4, an accumulator I5, a pressure reducing valve 6, a one-way Valve 7, accumulator Ⅱ8, 2-position 2-way high-speed hydraulic control switching valve 9, 2-position 5-way hydraulic control switching valve 12, 2-position 2-way hydraulic control switching valve 15, overflow valve Ⅱ13, high-speed large-tonnage hydraulic cylinder 14 , hydraulic pilot distribution valve 11, electric-mechanical converter 10 and other components.
图1中，主油箱1与过滤器2的进油口连接，过滤器2的出油口与液压泵3的进油口连接，液压泵3的出油口分别与溢流阀I4的进油口、蓄能器I5的进油口、减压阀6的进油口、二位五通液控切换阀12的A口、二位二通液控切换阀15的A口连接，减压阀6的出油口与单向阀7的进油口连接，单向阀7的出油口分别与蓄能器Ⅱ8、二位二通高速液控切换阀9的A口连接，二位二通液控高速切换阀9的B口与高速大吨位液压缸上腔14-1的B口连接，二位二通液控切换阀15的B口与高速大吨位液压缸上腔14-1的C口连接，二位五通液控切换阀12的D口与高速大吨位液压缸上腔14-1的A口连接，二位五通液控切换阀12的E口与高速大吨位液压缸下腔14-2连接，二位五通液控切换阀12的C口与溢流阀Ⅱ13的进油口连接，溢流阀I4的出油口、溢流阀Ⅱ13的出油口和二位五通液控切换阀12的B口与主油箱1连接。 In Fig. 1, the main oil tank 1 is connected to the oil inlet of the filter 2, the oil outlet of the filter 2 is connected to the oil inlet of the hydraulic pump 3, and the oil outlet of the hydraulic pump 3 is respectively connected to the oil inlet of the relief valve I4. port, the oil inlet of accumulator I5, the oil inlet of pressure reducing valve 6, the A port of 2-position 5-way hydraulic control switching valve 12, the A port of 2-position 2-way hydraulic control switching valve 15, the pressure reducing valve The oil outlet of 6 is connected with the oil inlet of one-way valve 7, and the oil outlet of one-way valve 7 is respectively connected with accumulator II 8 and A port of two-position two-way high-speed hydraulic control switch valve 9, two-position two-way The B port of the hydraulic control high-speed switching valve 9 is connected to the B port of the high-speed large-tonnage hydraulic cylinder upper chamber 14-1, and the B port of the two-position two-way hydraulic control switching valve 15 is connected to the C port of the high-speed large-tonnage hydraulic cylinder upper chamber 14-1. The D port of the two-position five-way hydraulic control switching valve 12 is connected to the A port of the upper chamber 14-1 of the high-speed large-tonnage hydraulic cylinder, and the E port of the two-position five-way hydraulic control switching valve 12 is connected to the lower chamber of the high-speed large-tonnage hydraulic cylinder. Cavity 14-2 is connected, the C port of the two-position five-way hydraulic control switching valve 12 is connected with the oil inlet of the relief valve Ⅱ13, the oil outlet of the relief valve I4, the oil outlet of the relief valve Ⅱ13 and the two-position five The B port of the hydraulic control switching valve 12 is connected with the main oil tank 1 .
本实施例液压系统的工作过程为： The working process of the present embodiment hydraulic system is:
数控装置发出指令信号（电信号）驱动电-机械转换器10工作，电-机械转换器10将指令信号转变成机械信号，并驱动液压先导分配阀11工作，液压先导分配阀11按序输出3路油压信号，即油压信号Ⅰ、油压信号Ⅱ、油压信号Ⅲ，油压信号Ⅰ控制二位五通液控切换阀12的工作，油压信号Ⅱ控制二位二通高速液控切换阀9的工作，油压信号Ⅲ控制二位二通液控切换阀15的工作。高速大吨位液压缸14向下快进时，此时二位二通高速液控切换阀9打开，21MPa的高压油从主油箱1中，依次通过过滤器2、液压泵3、减压阀6（减压为1MPa）、单向阀7、二位二通高速液控切换阀9，进入高速大吨位液压缸上腔14-1，待高速大吨位液压缸14下降到被冲工件，二位二通液控切换阀15打开，同时二位二通高速液控切换阀9关闭，21MPa的高压油从主油箱1中，依次通过过滤器2、液压泵3、二位二通液控切换阀15，进入高速大吨位液压缸上腔14-1，开始冲压工件。冲压完成后高速大吨位液压缸14向上快退，此时二位五通液控切换阀12、二位二通高速液控切换阀9打开，同时二位二通液控切换阀15关闭，21MPa的高压油从主油箱1中，依次通过过滤器2、液压泵3、二位五通液控切换阀12，进入高速大吨位液压缸下腔14-2，高速大吨位液压缸上腔14-1中的液压油一部分通过二位五通液控切换阀12、溢流阀Ⅱ13，进入主油箱1，另一部分通过二位二通高速液控切换阀9，进入蓄能器Ⅱ8。快退完成后，完成一次冲压，然后液压先导分配阀11再次按序输出油压信号，通过控制二位二通高速液控切换阀9、二位五通液控切换阀12、二位二通液控切换阀15，使高速大吨位液压缸14再次动作，完成冲压工作。 The numerical control device sends out a command signal (electrical signal) to drive the electric-mechanical converter 10 to work, and the electric-mechanical converter 10 converts the command signal into a mechanical signal, and drives the hydraulic pilot distribution valve 11 to work, and the hydraulic pilot distribution valve 11 outputs 3 in sequence oil pressure signal, that is, oil pressure signal Ⅰ, oil pressure signal Ⅱ, oil pressure signal Ⅲ, oil pressure signal Ⅰ controls the work of 2-position 5-way hydraulic control switch valve 12, and oil pressure signal Ⅱ controls 2-position 2-way high-speed hydraulic control The work of the switch valve 9, the oil pressure signal III controls the work of the two-position two-way hydraulic control switch valve 15. When the high-speed large-tonnage hydraulic cylinder 14 moves downward fast, the two-position two-way high-speed hydraulic control switching valve 9 is opened, and the 21MPa high-pressure oil passes through the filter 2, hydraulic pump 3, and pressure reducing valve 6 from the main oil tank 1 in sequence (Decompression is 1MPa), one-way valve 7, two-position two-way high-speed hydraulic control switching valve 9, enter the upper chamber 14-1 of the high-speed large-tonnage hydraulic cylinder, and wait for the high-speed large-tonnage hydraulic cylinder 14 to descend to the workpiece to be punched. The two-way hydraulic control switching valve 15 is opened, and the two-position two-way high-speed hydraulic control switching valve 9 is closed at the same time, and the 21MPa high-pressure oil passes through the filter 2, the hydraulic pump 3, and the two-position two-way hydraulic control switching valve from the main oil tank 1 in sequence 15. Enter the upper cavity 14-1 of the high-speed large-tonnage hydraulic cylinder and start stamping the workpiece. After the stamping is completed, the high-speed and large-tonnage hydraulic cylinder 14 fast-reverses upwards. At this time, the two-position five-way hydraulic control switching valve 12 and the two-position two-way high-speed hydraulic control switching valve 9 are opened, and the two-position two-way hydraulic control switching valve 15 is closed at the same time, 21MPa The high-pressure oil passes through the filter 2, the hydraulic pump 3, and the two-position five-way hydraulic control switching valve 12 from the main oil tank 1, and enters the lower cavity 14-2 of the high-speed large-tonnage hydraulic cylinder, and the upper cavity 14-2 of the high-speed large-tonnage hydraulic cylinder. Part of the hydraulic oil in 1 enters the main oil tank 1 through the two-position five-way hydraulic control switching valve 12 and the overflow valve II13, and the other part enters the accumulator II8 through the two-position two-way high-speed hydraulic control switching valve 9. After the fast rewind is completed, a stamping is completed, and then the hydraulic pilot distribution valve 11 outputs the oil pressure signal in sequence again, by controlling the two-position two-way high-speed hydraulic control switching valve 9, the two-position five-way hydraulic control switching valve 12, the two-position two-way The hydraulic control switching valve 15 makes the high-speed and large-tonnage hydraulic cylinder 14 move again to complete the stamping work.
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