阅读说明：本技术 一种大吨位液压机分级控制加压系统 (Large-tonnage hydraulic press grading control pressurization system ) 是由 凌家友 刘雪飞 江留宝 朱家洪 曾兵 熊勇 于 2019-10-25 设计创作，主要内容包括：一种大吨位液压机分级控制加压系统,包括一级主缸、二级主缸、一级主缸插装阀、二级主缸插装阀、一级主缸插装阀先导电磁阀、二级主缸插装阀先导电磁阀、二级主缸插装阀先导顺序阀,以及进油管路,所述一级主缸、二级主缸并排,且各主缸的活塞杆均与滑块固定相连,所述一级主缸的油口经一级主缸插装阀与进油管路连接,该一级主缸插装阀由所述一级主缸插装阀先导电磁阀控制开闭,所述二级主缸的油口经二级主缸插装阀与进油管路连接,该二级主缸插装阀由二级主缸插装阀先导顺序阀和二级主缸插装阀先导电磁阀控制开闭,所述二级主缸插装阀先导顺序阀的控制油口与进油管路连通。(A large-tonnage hydraulic press grading control pressurization system comprises a primary main cylinder, a secondary main cylinder, a primary main cylinder cartridge valve, a secondary main cylinder cartridge valve, a primary main cylinder cartridge valve pilot electromagnetic valve, a secondary main cylinder cartridge valve pilot electromagnetic valve and a secondary main cylinder cartridge valve pilot sequence valve, the primary main cylinder and the secondary main cylinder are arranged side by side, piston rods of the main cylinders are fixedly connected with the sliding block, an oil port of the primary main cylinder is connected with the oil inlet pipeline through a cartridge valve of the primary main cylinder, the opening and closing of the first-stage main cylinder cartridge valve is controlled by the pilot electromagnetic valve of the first-stage main cylinder cartridge valve, the oil port of the second-stage main cylinder is connected with an oil inlet pipeline through the second-stage main cylinder cartridge valve, the two-stage main cylinder cartridge valve is controlled to be opened and closed by a two-stage main cylinder cartridge valve pilot sequence valve and a two-stage main cylinder cartridge valve pilot electromagnetic valve, and a control oil port of the two-stage main cylinder cartridge valve pilot sequence valve is communicated with an oil inlet pipeline.)

1. A large-tonnage hydraulic press grading control pressurization system is characterized in that: comprises a primary main cylinder (1), a secondary main cylinder (2), a primary main cylinder cartridge valve (3), a secondary main cylinder cartridge valve (4), a primary main cylinder cartridge valve pilot electromagnetic valve (5), a secondary main cylinder cartridge valve pilot electromagnetic valve (6), a secondary main cylinder cartridge valve pilot sequence valve (7) and an oil inlet pipeline (8),

the primary main cylinder (1) and the secondary main cylinder (2) are arranged side by side, and the piston rod of each main cylinder is fixedly connected with the sliding block (9),

the oil port of the primary main cylinder (1) is connected with an oil inlet pipeline (8) through a primary main cylinder cartridge valve (3), the primary main cylinder cartridge valve (3) is controlled to open and close by a pilot electromagnetic valve (5) of the primary main cylinder cartridge valve,

an oil port of the secondary main cylinder (2) is connected with an oil inlet pipeline (8) through a secondary main cylinder cartridge valve (4), the secondary main cylinder cartridge valve (4) is controlled to be opened and closed by a secondary main cylinder cartridge valve pilot sequence valve (7) and a secondary main cylinder cartridge valve pilot electromagnetic valve (6), and a control oil port of the secondary main cylinder cartridge valve pilot sequence valve (7) is communicated with the oil inlet pipeline (8).

2. The large-tonnage hydraulic press staged control pressurization system of claim 1, characterized in that: the number of the primary master cylinders (1) is at least one, the number of the secondary master cylinders (2) is at least two, and the at least two secondary master cylinders (2) are distributed on two sides of the primary master cylinders (1).

3. According toThe large-tonnage hydraulic press staged-control pressurization system as set forth in claim 1 or 2, characterized in that: the action area S of the primary master cylinder (1)₁Is the action area S of the secondary main cylinder (2)₂1/3-1/2.

4. The large-tonnage hydraulic press staged control pressurization system of claim 1, characterized in that: the opening pressure difference of the pilot sequence valve (7) of the secondary master cylinder cartridge valve is 15-25 MPa.

5. The large-tonnage hydraulic press staged control pressurization system of claim 1, characterized in that: the oil supplementing tank is characterized by further comprising an oil supplementing tank (10), a primary main cylinder liquid charging valve (11) and a secondary main cylinder liquid charging valve (12), wherein the oil supplementing tank (10) is connected with an oil port of the primary main cylinder (1) through the primary main cylinder liquid charging valve (11), and the oil supplementing tank (10) is connected with an oil port of the secondary main cylinder (2) through the secondary main cylinder liquid charging valve (12).

6. The large-tonnage hydraulic press staged control pressurization system of claim 5, characterized in that: the device also comprises a liquid filling valve control electromagnetic valve (13), wherein the primary main cylinder liquid filling valve (11) and the secondary main cylinder liquid filling valve (12) are controlled to be opened through the liquid filling valve control electromagnetic valve (13) respectively.

7. The large-tonnage hydraulic press staged control pressurization system of claim 1, characterized in that: also comprises an oil return pipeline (14).

8. The large-tonnage hydraulic press staged control pressurization system of claim 7, characterized in that: an oil inlet of the first-stage main cylinder cartridge valve pilot electromagnetic valve (5) is connected with an oil inlet pipeline (8), an oil return port of the first-stage main cylinder cartridge valve pilot electromagnetic valve (5) is connected with an oil return pipeline (14), and an oil outlet of an executive part of the first-stage main cylinder cartridge valve pilot electromagnetic valve (5) is connected with a control oil port of the first-stage main cylinder cartridge valve (3).

9. The large-tonnage hydraulic press staged control pressurization system of claim 7, characterized in that: an oil inlet of the pilot electromagnetic valve (6) of the secondary master cylinder cartridge valve is connected with a working A port of the pilot sequence valve (7) of the secondary master cylinder cartridge valve, an oil outlet of an executive part of the pilot electromagnetic valve (6) of the secondary master cylinder cartridge valve is connected with an oil inlet pipeline (8) through the secondary cartridge valve (4), and a working B port of the pilot sequence valve (7) of the secondary master cylinder cartridge valve is connected with a control oil port of the pilot sequence valve (4) of the secondary master cylinder cartridge valve.

10. The large-tonnage hydraulic press staged control pressurization system of claim 1, characterized in that: pressure sensors (15) are respectively arranged between the first-stage main cylinder (1) and the first-stage cartridge valve (3) and between the second-stage main cylinder (2) and the second-stage cartridge valve (4), and displacement sensors (16) are arranged on the sliding blocks (9).

Technical Field

The invention relates to the field of hydraulic systems, in particular to a large-tonnage hydraulic press grading control pressurization system.

Background

Large tonnage hydraulic presses are generally operated by the cooperation of a plurality of cylinders. When the die is used for a die pressing forming process of a non-metal composite material product and a stretching die pressing forming process of a metal product, according to the characteristics of the material deformation process, the characteristics that the material deformation resistance is small due to the fact that the die needs to be pressed quickly in the front-section pressing time when contacting with a workpiece, and the material deformation resistance is large due to the fact that the die needs to be pressed slowly in the rear-section pressing time can be achieved. Aiming at the processing requirements, a common control method simultaneously provides power oil for a plurality of main oil cylinders for pressing, determines the oil supply capacity of the power oil of the hydraulic system according to the rapid pressing speed and the pressurizing action sectional area of the main oil cylinders, and determines the maximum configuration power of the hydraulic system according to the slow pressing speed, the maximum deformation resistance and the pressurizing action sectional area of the main oil cylinders. Therefore, the required hydraulic system has large oil supply capacity, a large number of main pump groups and a complex hydraulic system, so that the defects of high cost, increased fault points, increased oil leakage risk points and large maintenance workload of the hydraulic system are caused.

Disclosure of Invention

The invention aims to provide a large-tonnage hydraulic press stepped control pressurization system aiming at the defects of the prior art, which greatly reduces the oil supply capacity of a hydraulic system and the number of main pumps on the premise of meeting the requirements of related molding processes, thereby reducing the cost of the hydraulic system, reducing fault points and oil leakage risks and effectively reducing the maintenance cost.

The technical scheme of the invention is as follows: a large-tonnage hydraulic press grading control pressurization system comprises a primary main cylinder, a secondary main cylinder, a primary main cylinder cartridge valve, a secondary main cylinder cartridge valve, a primary main cylinder cartridge valve pilot electromagnetic valve, a secondary main cylinder cartridge valve pilot electromagnetic valve and a secondary main cylinder cartridge valve pilot sequence valve, the primary main cylinder and the secondary main cylinder are arranged side by side, piston rods of the main cylinders are fixedly connected with the sliding block, an oil port of the primary main cylinder is connected with the oil inlet pipeline through a cartridge valve of the primary main cylinder, the opening and closing of the first-stage main cylinder cartridge valve is controlled by the pilot electromagnetic valve of the first-stage main cylinder cartridge valve, the oil port of the second-stage main cylinder is connected with an oil inlet pipeline through the second-stage main cylinder cartridge valve, the two-stage main cylinder cartridge valve is controlled to be opened and closed by a two-stage main cylinder cartridge valve pilot sequence valve and a two-stage main cylinder cartridge valve pilot electromagnetic valve, and a control oil port of the two-stage main cylinder cartridge valve pilot sequence valve is communicated with an oil inlet pipeline.

The number of the primary master cylinders is at least one, the number of the secondary master cylinders is at least two, and the at least two secondary master cylinders are distributed on two sides of the primary master cylinder.

The action area S of the primary master cylinder₁Is the active area S of the secondary master cylinder₂1/3-1/2.

The opening pressure difference of the pilot sequence valve of the secondary master cylinder cartridge valve is 15-25 MPa.

The oil supplementing tank is connected with an oil port of the primary main cylinder through the primary main cylinder liquid filling valve, and the oil supplementing tank is connected with an oil port of the secondary main cylinder through the secondary main cylinder liquid filling valve.

The device also comprises a liquid filling valve control electromagnetic valve, and the primary main cylinder liquid filling valve and the secondary main cylinder liquid filling valve are controlled to be opened through the liquid filling valve control electromagnetic valve respectively.

Also comprises an oil return pipeline.

An oil inlet of the first-stage main cylinder cartridge valve pilot solenoid valve is connected with an oil inlet pipeline, an oil return port of the first-stage main cylinder cartridge valve pilot solenoid valve is connected with an oil return pipeline, and an oil outlet of an actuating piece of the first-stage main cylinder cartridge valve pilot solenoid valve is connected with a control oil port of the first-stage main cylinder cartridge valve.

An oil inlet of the pilot solenoid valve of the secondary master cylinder cartridge valve is connected with a working port A of the pilot sequence valve of the secondary master cylinder cartridge valve, an oil outlet of an executive part of the pilot solenoid valve of the secondary master cylinder cartridge valve is connected with an oil inlet pipeline through the secondary cartridge valve, and a working port B of the pilot sequence valve of the secondary master cylinder cartridge valve is connected with a control oil port of the secondary master cylinder cartridge valve.

Pressure sensors are respectively arranged between the first-stage main cylinder and the first-stage cartridge valve and between the second-stage main cylinder and the second-stage cartridge valve, and displacement sensors are arranged on the sliding blocks.

Adopt above-mentioned technical scheme to have following beneficial effect:

1. the large-tonnage hydraulic press stepped control pressurization system comprises a primary main cylinder, a secondary main cylinder, a primary main cylinder cartridge valve, a secondary main cylinder cartridge valve, a primary main cylinder cartridge valve pilot solenoid valve, a secondary main cylinder cartridge valve pilot sequence valve and an oil inlet pipeline, wherein when the primary main cylinder works alone, the primary main cylinder is used for meeting the work advance requirement of high-speed medium-low pressing force, and the secondary main cylinder and the primary main cylinder work in cooperation, so that the work advance requirement of low-speed high-pressing force is met. The primary main cylinder and the secondary main cylinder are arranged side by side, and piston rods of the main cylinders are fixedly connected with the sliding blocks, namely, the primary main cylinder and the secondary main cylinder can drive the sliding blocks independently or cooperatively, so that the working feeding requirements of different pressing forces are met. The hydraulic fluid port of the first-level main cylinder is connected with an oil inlet pipeline through a first-level main cylinder cartridge valve, the first-level main cylinder cartridge valve is controlled to be opened and closed by a first-level main cylinder cartridge valve pilot solenoid valve, and aiming at the characteristics that the non-metal conforming material product compression molding process and the metal product stretching compression molding process need to be rapidly pressed in the front-stage pressing time but the material deformation resistance is small, the first-level main cylinder cartridge valve is opened by controlling the first-level main cylinder cartridge valve pilot solenoid valve, pressure oil of the oil inlet pipeline enters the first-level main cylinder through the first-level main cylinder cartridge valve, the first-level main cylinder drives a sliding block to be rapidly pressed under the action of the pressure oil, and the rapid middle-low pressing force working requirement is met. The oil port of the secondary main cylinder is connected with an oil inlet pipeline through a secondary main cylinder cartridge valve, the secondary main cylinder cartridge valve is controlled to be opened and closed by a secondary main cylinder cartridge valve pilot sequence valve and a secondary main cylinder cartridge valve pilot solenoid valve, the oil port of the secondary main cylinder cartridge valve pilot sequence valve is communicated with the oil inlet pipeline, the deformation resistance of a pressed workpiece is continuously increased in the pressing and forming process, when the pressure of a primary main cylinder rises to the set pressure of the secondary main cylinder cartridge valve pilot sequence valve, the secondary main cylinder cartridge valve pilot sequence valve is conducted, the secondary main cylinder cartridge valve is opened, the pressure oil of the oil inlet pipeline respectively enters the primary main cylinder and the secondary main cylinder cartridge valve through the primary main cylinder cartridge valve and enters the secondary main cylinder, the primary main cylinder and the secondary main cylinder synchronously drive a sliding block to perform slow-speed pressing under the action of the pressure oil, and the secondary main cylinder corresponds to the rear-, the requirement of low-speed high-pressure braking force working is met. For the working condition that the whole-course high-pressing force is needed for slow pressing, the pilot sequence valve of the first-stage main cylinder cartridge valve and the pilot sequence valve of the second-stage main cylinder cartridge valve are electrified simultaneously, the first-stage main cylinder cartridge valve and the second-stage main cylinder cartridge valve are conducted simultaneously, and the pressure oil of the oil inlet pipeline provides the pressure oil for the first-stage main cylinder and the second-stage main cylinder simultaneously, so that the whole-course slow high-pressure braking force is realized.

2. The quantity of one-level master cylinder is one at least, the quantity of second grade master cylinder is two at least, and the quantity is two at least second grade master cylinder and distributes in the both sides of one-level master cylinder, because the second grade master cylinder is directed against the worker that is high pressure at a slow speed and advances the suppression, and the distribution of second grade master cylinder is in the both sides of one-level master cylinder, guarantees that the slider atress is even, avoids the slider to take place deformation because of the atress inequality, guarantees the stability that the suppression worker advances.

3. Area of action S of primary master cylinder₁Is the active area S of the secondary master cylinder₂1/3-1/2, the one-level master cylinder of this kind of structure is fit for quick low pressure worker and is advanced the demand when alone operation, in addition, compares with traditional pressurization system, has still effectively reduced pressure oil flow, has effectively reduced the cost of pressurization system.

4. The hydraulic cylinder, the hydraulic cylinder of second grade main cylinder hydraulic cylinder through the main cylinder hydraulic cylinder valve, guarantee the smooth action of slider.

5. The hydraulic oil in each main cylinder oil cavity flows back to the oil supplementing tank through the corresponding main cylinder liquid filling valve, and the hydraulic oil is recycled.

The following further description is made with reference to the accompanying drawings and detailed description.

Drawings

FIG. 1 is a schematic diagram of the connection of the present invention.

In the drawing, 1 is a primary master cylinder, 2 is a secondary master cylinder, 3 is a primary master cylinder cartridge valve, 4 is a secondary master cylinder cartridge valve, 5 is a primary master cylinder cartridge valve pilot solenoid valve, 6 is a secondary master cylinder cartridge valve pilot solenoid valve, 7 is a secondary master cylinder cartridge valve pilot sequence valve, 8 is an oil inlet pipeline, 9 is a slider, 10 is an oil supplementing tank, 11 is a primary master cylinder liquid filling valve, 12 is a secondary master cylinder liquid filling valve, 13 is a liquid filling valve control solenoid valve, 14 is an oil return pipeline, 15 is a pressure sensor, and 16 is a displacement sensor.

Detailed Description

In the present invention, the components of specific structure and connection mode are not indicated, and the components and connection mode are generally conventional.

Referring to fig. 1, it is a specific embodiment of a large tonnage hydraulic press step control pressurization system. The large-tonnage hydraulic press stepped control pressurization system comprises a primary master cylinder 1, a secondary master cylinder 2, a primary master cylinder cartridge valve 3 (valve model: TLC AB40E-7X + TLFA WERZA-7X-SM), a secondary master cylinder cartridge valve 4 (valve model: TLC DB20G + TLFA WECB-7X-SM), a primary master cylinder cartridge valve pilot solenoid valve 5 (valve model: 4WE6D6X/EG24N9K4), a secondary master cylinder cartridge valve pilot solenoid valve 6 (valve model: 4WE6D6X/EG24N9K4), a secondary master cylinder cartridge valve pilot sequence valve 7 (valve model: DZC-1-30/20), an oil inlet pipeline 8 and an oil return pipeline 14, wherein the pressure oil pressure in the oil inlet pipeline is limited to be below 32 MPa. The primary master cylinder 1 and the secondary master cylinder 2 are arranged side by side, piston rods of the master cylinders are fixedly connected with the sliding block 9, specifically, the number of the primary master cylinders 1 is at least one, the number of the secondary master cylinders 2 is at least two, and the number of the secondary master cylinders is at least twoThe two-stage main cylinders 2 are distributed on two sides of the one-stage main cylinder 1, in the embodiment, the number of the one-stage main cylinders is one, the number of the two-stage main cylinders is two, the two-stage main cylinders are respectively positioned on two sides of the one-stage main cylinder and symmetrically distributed, and in order to meet the feeding characteristic of the one-stage main cylinder in the early stage of pressing, the action area S of the one-stage main cylinder 1₁Is the effective area S of two secondary main cylinders 2₂1/3-1/2. An oil port of the primary master cylinder 1 is connected with an oil inlet pipeline 8 through a primary master cylinder cartridge valve 3, the primary master cylinder cartridge valve 3 is controlled to be opened and closed by a primary master cylinder cartridge valve pilot electromagnetic valve 5, specifically, an oil inlet of the primary master cylinder cartridge valve pilot electromagnetic valve 5 is connected with the oil inlet pipeline 8, an oil return port of the primary master cylinder cartridge valve pilot electromagnetic valve 5 is connected with an oil return pipeline 14, and an executing part oil outlet of the primary master cylinder cartridge valve pilot electromagnetic valve 5 is connected with a control oil port of the primary master cylinder cartridge valve 3. The oil port of the secondary main cylinder 2 is connected with an oil inlet pipeline 8 through a secondary main cylinder cartridge valve 4, the secondary main cylinder cartridge valve 4 is controlled to be opened and closed by a secondary main cylinder cartridge valve pilot sequence valve 7 and a secondary main cylinder cartridge valve pilot electromagnetic valve 6, the control oil port of the pilot sequence valve 7 of the secondary main cylinder cartridge valve is communicated with the oil inlet pipeline 8, the opening pressure difference of the pilot sequence valve 7 of the secondary main cylinder cartridge valve is 15-25MPa, an oil inlet of the pilot solenoid valve 6 of the secondary master cylinder cartridge valve is connected with a working A port of the pilot sequence valve 7 of the secondary master cylinder cartridge valve, an oil outlet of an executive part of the pilot solenoid valve 6 of the secondary master cylinder cartridge valve is connected with an oil inlet pipeline 8 through the secondary cartridge valve 4, a working B port of the pilot sequence valve 7 of the secondary master cylinder cartridge valve is connected with a control oil port of the secondary master cylinder cartridge valve 4, and an outer leakage port of the pilot sequence valve of the secondary master cylinder cartridge valve is connected with an oil return pipeline.

Further, in order to replenish oil to the oil cavities of the primary main cylinder and the secondary main cylinder in time and ensure smooth movement of the sliding block, the hydraulic system further comprises an oil replenishing tank 10, a primary main cylinder liquid filling valve 11 and a secondary main cylinder liquid filling valve 12, wherein the oil replenishing tank 10 is connected with an oil port of the primary main cylinder 1 through the primary main cylinder liquid filling valve 11, and the oil replenishing tank 10 is connected with an oil port of the secondary main cylinder 2 through the secondary main cylinder liquid filling valve 12.

Furthermore, in order to fully recycle the hydraulic oil, the hydraulic system also comprises a charging valve control electromagnetic valve 13, and the primary main cylinder charging valve 11 and the secondary main cylinder charging valve 12 are controlled to be opened through the charging valve control electromagnetic valve 13 respectively.

Further, in order to monitor the pressure of the pressure oil and the position of the slide block, pressure sensors 15 are respectively arranged between the primary main cylinder 1 and the primary cartridge valve 3, and between the secondary main cylinder 2 and the secondary cartridge valve 4, and a displacement sensor 16 is arranged on the slide block 9.

The working principle of the invention is as follows: aiming at the non-metal conforming material product compression molding process and the metal product stretching compression molding process, the characteristics that the mold needs to be quickly pressed in the front section pressing time when contacting with a workpiece, but the material has smaller deformation resistance and needs to be slowly pressed in the rear section pressing time, but the material has larger deformation resistance are provided. The pilot electromagnetic valve of the first-level main cylinder cartridge valve is electrified, the first-level main cylinder cartridge valve is conducted, pressure oil of an oil inlet pipeline enters the first-level main cylinder through the first-level main cylinder cartridge valve, the first-level main cylinder drives the sliding block to perform rapid working pressing under the action of the pressure oil, the non-metal material meets the front-stage pressing stage of a material product compression molding process and a metal product stretching compression molding process, and the rapid middle-low pressing working force working requirement is met. During the compression molding process of a pressed workpiece, the deformation resistance is continuously increased until the pressure of a primary main cylinder rises to the set pressure (15-25MPa) of a secondary main cylinder cartridge valve, the secondary main cylinder cartridge valve is conducted, the secondary main cylinder cartridge valve is opened, pressure oil in an oil inlet pipeline enters the primary main cylinder and the secondary main cylinder respectively through the primary main cylinder cartridge valve and the secondary main cylinder cartridge valve, the primary main cylinder and the secondary main cylinder synchronously drive a sliding block to perform slow-speed working and pressing under the action of the pressure oil, and the requirements of the slow-speed high-pressure working and pressing are met corresponding to the non-metal conforming material product compression molding process and the rear-stage pressing stage of the metal product stretch compression molding process.

For the working condition that the whole-course high-pressing force is needed for slow pressing, the pilot sequence valve of the first-stage main cylinder cartridge valve and the pilot sequence valve of the second-stage main cylinder cartridge valve are electrified simultaneously, the first-stage main cylinder cartridge valve and the second-stage main cylinder cartridge valve are conducted simultaneously, and the pressure oil of the oil inlet pipeline provides the pressure oil for the first-stage main cylinder and the second-stage main cylinder simultaneously, so that the whole-course slow high-pressure braking force is realized.

After pressing is finished, piston rods of the primary main cylinder and the secondary main cylinder are reset under the action of external force, the solenoid valve is controlled to be powered by the liquid filling valve, the liquid filling valve of the primary main cylinder and the liquid filling valve of the secondary main cylinder are communicated, hydraulic oil in oil cavities of the main cylinders flows back into the oil filling tank through the corresponding main cylinder liquid filling valves, and the hydraulic oil is recycled.