WO2020177611A1

WO2020177611A1 - Energy-saving gas-liquid booster control device

Info

Publication number: WO2020177611A1
Application number: PCT/CN2020/076959
Authority: WO
Inventors: 陈海楼; 成才飞
Original assignee: 南京蒙福液压机械有限公司
Priority date: 2019-03-04
Filing date: 2020-02-27
Publication date: 2020-09-10
Also published as: CN209838800U

Abstract

Disclosed is an energy-saving gas-liquid booster control device. By means of an air cylinder driving two oil cylinders to act in a staggered manner, oil suction and oil discharge are performed at the same time, thereby avoiding the defect of oil supply interruption of a traditional booster device while improving the efficiency, and realizing gas-liquid boosting. The invention further comprises a pneumatic pressure regulating valve and a hydraulic accumulator, oil discharge pressure of a hydraulic system constituted by the oil cylinders is controlled by means of a pneumatic pressure valve regulating air intake pressure, and the hydraulic pressure accumulator buffers pressure fluctuation, caused by intermittent oil supply generated at the moment of reversing of the air cylinder, of a gas-liquid booster control device. Moving components, such as a piston, of the device use a large quantity of aluminum alloy, thereby reducing the weight of a reciprocating moving component as much as possible while ensuring strength, improving the sensitivity of reversing, and also reducing pressure fluctuation while reducing energy consumption in reversing.

Description

[Correct 11.03.2020 according to Rule 26] 　An energy-saving gas-liquid pressurization control device

Technical field

The utility model belongs to gas-liquid conversion equipment, in particular to an energy-saving gas-liquid pressurization control device.

Background technique

At present, the hydraulic systems of CNC machine tools basically use electric motors to drive hydraulic pumps to provide the high-pressure oil required for the operation of the chuck, tailstock and tool post to drive them. The advantages of this fuel supply method are stable fuel supply pressure, low fuel supply pulsation, and low noise, but the disadvantages of this fuel supply method are also obvious, mainly in the following aspects: First, the oil pump motor unit occupies the upper cover of the fuel tank Larger space; second, the weight of the oil pump motor unit is larger; third, the energy consumption of the oil pump motor unit is larger, especially when the hydraulic system needs to maintain pressure, the oil pump needs to continuously provide high pressure oil to the chuck To maintain the clamping of the chuck, the motor must always run at full speed. This part of the energy is wasted, although most hydraulic stations are now.

Choosing the automatic variable pump reduces the energy consumption of the system to a certain extent, but the hydraulic system always needs to consume a lot of power when running under high pressure, and the motor runs inefficiently under light load. Larger energy consumption also causes the oil temperature of the hydraulic system to rise easily. As a result, the hydraulic system has to take auxiliary measures to increase the oil tank volume and increase the air cooler or water cooler to help the hydraulic system dissipate heat, which makes the hydraulic system larger and occupying There is a lot of space in the inner board of the machine tool, and the heat dissipation design of the hydraulic system needs to be considered for the machine tool, which increases the design workload of the machine tool. At present, the gas-liquid pressurization device can solve the energy consumption problem of the hydraulic system. The gas-liquid pressurization device is driven by the reciprocating action of the cylinder to provide the high-pressure oil required for the operation of the machine tool. It only needs compressed air to blow when the hydraulic system of the machine tool maintains pressure Keep a certain pressure in the cylinder, and the cylinder does not move. At this time, the energy consumption of the hydraulic system is extremely small, the system does not generate heat, and no heat dissipation device is required. Therefore, the hydraulic system can be greatly reduced in size, but the current gas-liquid pressurization Because the cylinder reciprocates to suck and discharge oil, the device has the disadvantages of unstable oil supply pressure and large oil supply pulsation.

Utility model content

Purpose of the utility model: In view of the above-mentioned shortcomings of the prior art, the utility model provides an energy-saving gas-liquid conversion control device, which aims to solve the control problems and energy-saving problems of gas-liquid pressurization and gas-liquid conversion equipment.

Technical solution: An energy-saving gas-liquid pressurization control device, the device is composed of a cylinder and a cylinder, the cylinder includes a cylinder back cover, a front cylinder tube, a front piston, a cylinder sealing ring, a cylinder middle body, and a cylinder sealing ring , Rear cylinder, piston rod and cylinder front cover; the cylinder includes a pneumatic reversing valve, a cylinder front cover, a cylinder cylinder, a cylinder piston, a striker, and a cylinder back cover. In the device, the piston in the cylinder body passes through the piston The rod is connected with the cylinder piston in the cylinder, and the push-pull reciprocating motion of the cylinder piston drives the front piston of the oil cylinder to reciprocate to complete the oil suction and oil discharge actions of the device.

Further, a cylinder middle body is provided at the junction of the front cylinder tube and the rear cylinder tube of the cylinder part, and two adjacent cylinder tubes and oil passages are tightly connected by a cylinder sealing ring. The cylinder middle body is also provided with an oil suction The check valve and the oil outlet check valve are correspondingly connected to the oil outlet and the oil suction port.

Further, the front cover of the oil cylinder and the rear cover of the oil cylinder are provided with vent holes to communicate with the atmosphere, and the pistons and the front and rear covers of the cylinder and the oil cylinder are equipped with sealing rings and guide bands to separate each cavity.

Furthermore, the cylinder and the oil cylinder are sealed and fixed by welding or bolts, and the joint is provided with a sealing ring.

Preferably, the device is further provided with a gas-liquid pressurizing device, and the gas-liquid pressurizing device includes a pneumatic pressure regulating valve and a hydraulic accumulator.

Further, the pneumatic pressure regulating valve is located at the air inlet of the gas-liquid supercharging device and is connected with the air inlet of the cylinder to adjust the air inlet pressure of the cylinder. The hydraulic accumulator is located at the oil outlet of the device, and the buffer device The pressure pulsation caused by the intermittent oil supply at the moment of cylinder reversal.

Beneficial effects: Compared with the prior art, the utility model firstly reduces energy consumption, simplifies the hydraulic system, reduces the energy consumption and heat generation of the hydraulic system, can omit the heat dissipation device, and can also have a large oil tank. The range is reduced, only the fuel consumption can be supplied for the back and forth movement of the cylinder; second, the front and rear chambers of the cylinder are fully utilized, and the work efficiency is doubled. The staggered suction and discharge of the front and rear cylinders can also avoid a series of interruptions caused by the oil supply. The problem, coupled with the buffering effect of the accumulator, the pressure pulsation of the gas-liquid booster control device is close to the oil pressure pulsation of the oil pump motor unit; third, the utility model does not need to provide three-phase power to the hydraulic system, which simplifies the machine tool The application circuit improves the safety of the hydraulic system of the machine tool.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the utility model.

detailed description

In order to describe the technical solution disclosed in the present invention in detail, the following further elaboration is made in conjunction with specific embodiments and drawings.

The utility model provides an energy-saving gas-liquid pressurization control device. The device uses a combination of a large-diameter cylinder and a small-diameter hydraulic cylinder, and uses the push-pull reciprocating motion of the cylinder to drive the piston of the hydraulic cylinder to reciprocate to complete the gas-liquid The oil suction and discharge functions of the booster device. Aiming at the shortcomings of traditional gas-liquid control devices or gas-liquid boosting devices, the gas-liquid conversion control device uses a double-acting cylinder to drive two hydraulic cylinders connected in series through a piston rod. The cylinder and the piston of the hydraulic cylinder are rigidly connected. The oil suction and oil discharge of the two hydraulic cylinders are staggered with each other, so that whether the cylinder is moving forward or backward, both suction and oil discharge are completed at the same time, and the working efficiency of the hydraulic system is doubled.

The operating principle of the utility model is: when high pressure gas is blown into the back cavity of the cylinder to push the piston rod of the cylinder forward, the piston rod of the cylinder drives the pistons of the front and rear hydraulic cylinders to advance forward, and the back hydraulic cylinder presses the internal hydraulic oil at a certain pressure. Push out the oil cylinder into the hydraulic valve group of the machine tool. While driving the machine tool cylinder to run, the previous hydraulic cylinder sucks in hydraulic oil at the same time. When the cylinder piston is pushed to the end, the piston hits the reversing pin on the cylinder, and the reversing valve acts, and the high pressure gas While blowing into the front cavity of the cylinder, the back cavity of the cylinder is connected to the bleed hole, the cylinder piston returns to the rear limit of the cylinder under the push of high pressure gas. At this time, the cylinder piston rod drives the two cylinder pistons to pull back, and the front hydraulic cylinder will The hydraulic oil pushes out the cylinder at a certain pressure and enters the hydraulic valve group of the machine tool. While driving the cylinder of the machine tool to run, the next hydraulic cylinder simultaneously sucks in hydraulic oil. When the cylinder reaches the rear limit, the cylinder piston hits the reversing pin of the cylinder back cover. The valve changes direction and the cylinder repeats its forward movement, and so on.

Specifically, as shown in Figure 1. The energy-saving gas-liquid conversion control device of the utility model adopts a large-diameter cylinder combined with a front and rear two-stage small-diameter hydraulic cylinder, fixed with a long bolt, and an oil cylinder body with oil distribution function is arranged in the middle of the front and rear two-stage hydraulic cylinders 5. There are 2 oil suction check valves and oil discharge check valves in the middle body 5 of the oil cylinder, which separate the oil suction and oil output of the front and rear two-stage hydraulic cylinders without interference with each other. The cylinder and the oil cylinder are integrated with the piston rod 8. Design, the piston of the second stage oil cylinder is integrated on the piston rod, and the front piston 3 and cylinder piston 13 of the first stage oil cylinder are fixed on the piston rod 8 with nuts. In order to prevent the gas holding phenomenon during the operation of the oil cylinder, the front cover of the oil cylinder 9 A vent hole is drilled on the rear cover 1 of the cylinder to communicate with the atmosphere. The pistons of the cylinder and the cylinder and the front and rear covers are equipped with sealing rings and guide belts to separate the various cavities to achieve the effect of non-interference. Use large-diameter cylinders The push-pull reciprocating motion drives the reciprocating motion of the piston of the oil cylinder to complete the oil suction and oil discharge functions of the gas-liquid increasing device.

Preferably, through the actual design experience of the hydraulic system of the CNC machine tool, it is determined that the hydraulic working pressure of the CNC machine tool is about 4Mpa, combined with the air source working pressure of the general factory to be about 0.4Mpa, and the piston area of the cylinder and the hydraulic cylinder is calculated reasonably. Recently, the pressurization ratio of the gas-liquid pressurization device is determined to be 10. According to the calculation of the hydraulic chuck volume of most CNC machine tools, the discharge volume of each stroke of the cylinder is determined to be 160ml, the cylinder diameter of the cylinder is 55mm, and the rod diameter is selected 20mm, stroke 80mm calculates that the cylinder bore is 160mm. When the cylinder advances forward, the oil cylinder at the rear will discharge oil and the oil cylinder at the front will suck oil. At this time, high-pressure air acts on the entire cylinder piston, and the thrust is the cross-sectional area of the cylinder piston X air source pressure. Assuming that the air source pressure is 0.4Mpa at this time, it is calculated that the thrust of the cylinder at this time is 0.8 tons. At this time, the thrust of 0.8 tons is transmitted to the piston of the rear cylinder through the piston rod (the pressure required for oil suction is extremely small and is ignored here) After pushing, the hydraulic oil inside the cylinder is discharged. At this time, the pressure of the oil pressure is the cylinder thrust/the area of the rod cavity in the rear cylinder. The oil output pressure at this time is calculated to be 4Mpa. When the cylinder is retracted, the back cylinder enters oil, and the front cylinder When the oil is discharged, the high-pressure gas acts on the piston with rod cavity in the cylinder (piston area minus the area of the piston rod). At this time, the area of the rod cavity is slightly smaller than the area of the rodless cavity. The pulling force is the area of the rod cavity of the cylinder X the air source pressure. Assuming that the air source pressure is 0.4Mpa at this time, it is calculated that the thrust of the cylinder at this time is 0.7875 tons. At this time, the pulling force of 0.7875 tons is transmitted to the piston of the front cylinder through the piston rod (the pressure required for oil suction is extremely small and is ignored here) Pull the hydraulic oil inside the front cylinder to discharge. At this time, the hydraulic pressure is the cylinder thrust/the front cylinder has a rod cavity area. Because of the difference in the area of the front and rear cylinders, in order to achieve the same pressure output from the front and rear cylinders, the cylinder diameter of the front cylinder is slightly smaller than that of the rear cylinder. After calculation, the cylinder diameter of the front cylinder is determined to be 54.6. According to this parameter, the output pressure is 4Mpa, which reaches the output balance of the front and rear chambers. The gas-liquid pressurization device uses a double-acting cylinder to drive two cylinders through a piston rod. Two hydraulic cylinders connected in series, the cylinder and the piston of the hydraulic cylinder are rigidly connected, and the oil suction and oil output of the two hydraulic cylinders are staggered, so that the cylinder completes the two actions of oil suction and oil output at the same time regardless of whether the cylinder is moving forward or backward. The work efficiency has doubled. The specific operation is as follows:

When high-pressure gas is blown into the rear cavity of the cylinder barrel 12 to push the cylinder piston 13 and the cylinder piston 13 pushes the piston rod 8 forward, the piston rod 8 of the cylinder part drives the two cylinder pistons forward and backward, and the piston rod 8 of the rear cylinder part (Built-in piston) The hydraulic oil inside the rear cylinder tube 7 is pushed out of the cylinder at a certain pressure through the oil outlet check valve and enters the hydraulic valve group of the machine tool to drive the machine tool cylinder. At the same time, the front piston 3 passes the front cylinder tube 2 through the suction sheet. The hydraulic oil is sucked into the valve at the same time. When the cylinder piston is pushed to the end, the piston hits the striker 14 on the cylinder head, the pneumatic reversing valve 10 acts, and the high pressure air is blown into the front cavity of the cylinder barrel 12, and the rear cavity of the cylinder is connected and released. The air hole, the cylinder piston 13 is pushed back to the cylinder by the high pressure gas to limit the position. At this time, the cylinder piston rod drives the two cylinder pistons to pull back, and the front cylinder 2 passes the internal hydraulic oil through the oil outlet check valve at a certain pressure When the cylinder is pushed out into the hydraulic valve group of the machine tool to drive the cylinder of the machine tool to run, the rear cylinder tube 7 simultaneously sucks in hydraulic oil. When the cylinder reaches the rear limit, the cylinder piston hits the striker 14 of the cylinder rear cover, and the pneumatic reversing valve 10 realizes the reversal. , The cylinder repeats its forward movement again, and so on.

The gas-liquid pressurization control device uses one cylinder to drive the two cylinders to move in a staggered manner. The oil suction and the oil discharge are performed at the same time, which improves efficiency and avoids the defect of interruption of oil supply of the traditional pressurization device. The utility model reduces the energy consumption of the hydraulic system and the heat generation accordingly. All heat dissipation devices can be omitted, and the volume of the fuel tank can also be greatly reduced. It only needs to be able to supply the fuel consumption of the cylinder to move back and forth, the original 100L The fuel tank is now only about 40L.

Claims

An energy-saving gas-liquid pressurization control device. The device is composed of an oil cylinder and an air cylinder. The oil cylinder includes an oil cylinder rear cover (1), a front cylinder tube (2), a front piston (3), and an oil cylinder sealing ring (4). ), the cylinder body (5), the cylinder sealing ring (6), the rear cylinder tube (7), the piston rod (8) and the cylinder front cover (9); the cylinder includes a pneumatic reversing valve (10), a front cylinder The cover (11), the cylinder barrel (12), the cylinder piston (13), the striker (14) and the cylinder rear cover (15) are characterized in that the piston in the cylinder barrel in the device passes through the piston rod (8) It is connected with the cylinder piston (13) in the cylinder, and the push-pull reciprocating motion of the cylinder piston (13) drives the front piston (3) of the oil cylinder to reciprocate to complete the oil suction and oil discharge actions of the device.
The energy-saving gas-liquid pressurization control device according to claim 1, characterized in that: the connection of the front cylinder (2) and the rear cylinder (7) of the cylinder part is provided with a cylinder middle body (5) , The two adjacent cylinder barrels and the oil circuit are tightly connected by the oil cylinder sealing ring (6), and the oil cylinder body (5) is also provided with an oil suction check valve and an oil discharge check valve, which are correspondingly connected to the oil outlet and the oil suction mouth.
The energy-saving gas-liquid pressurization control device according to claim 1, characterized in that: the cylinder front cover (1) and the cylinder rear cover (9) are provided with vent holes to communicate with the atmosphere, the cylinder and the cylinder piston Sealing rings and guide belts are installed on the front and rear covers to separate each cavity.
The energy-saving gas-liquid pressurization control device according to claim 1, wherein the cylinder and the oil cylinder are sealed and fixed by welding or bolts, and the joint is provided with a sealing ring.
The energy-saving gas-liquid pressurization control device according to claim 1, wherein the device is further provided with a gas-liquid pressurization device, and the gas-liquid pressurization device includes a pneumatic pressure regulating valve and a hydraulic energy storage device. Device.
The energy-saving gas-liquid supercharging control device according to claim 5, characterized in that: the pneumatic pressure regulating valve is located at the air inlet of the gas-liquid supercharging device, and is connected with the air inlet of the cylinder to adjust the air inlet of the cylinder. Air pressure, the hydraulic accumulator is located at the oil outlet of the device, and the pressure pulsation caused by the intermittent oil supply of the buffer device at the moment of cylinder reversal.