阅读说明：本技术 一种连续变压的大变压范围高速阀控液压缸液压变压器 (Continuous-transformation large-transformation-range high-speed valve control hydraulic cylinder hydraulic transformer ) 是由 周连佺 薄晓楠 张楚 刘强 杜文芳 于 2020-06-16 设计创作，主要内容包括：一种连续变压的大变压范围高速阀控液压缸液压变压器,包括液压油缸,液压油缸的活塞杆两端具有质量块,活塞杆和质量块组成质量块活塞杆,质量块活塞杆左右两边的行程尽头处分别布置有行程开关。本发明通过单向阀和高速开关阀的结合,对油液流向进行控制,外加蓄能器,使得经单向阀流向负载的流量连续。整体结构左右对称,增压过程和减压过程的功能原理对称,增压过程中正向增压和反向增压的功能原理对称,减压过程中正向减压和反向减压的功能原理对称；通过液压能和质量块活塞杆动能的相互转化,可在不改变液压缸结构的前提下,实现连续无级变压,且仅需调节PWM信号的占空比,即可得到所需液压变压比,控制方便,结构简单,无振动和噪声。(The hydraulic transformer comprises a hydraulic oil cylinder, mass blocks are arranged at two ends of a piston rod of the hydraulic oil cylinder, the piston rod and the mass blocks form a mass block piston rod, and travel switches are respectively arranged at the travel ends of the left side and the right side of the mass block piston rod. The invention controls the flow direction of oil through the combination of the one-way valve and the high-speed switch valve, and is additionally provided with the energy accumulator, so that the flow flowing to the load through the one-way valve is continuous. The integral structure is bilaterally symmetrical, the functional principles of the pressurization process and the decompression process are symmetrical, the functional principles of forward pressurization and reverse pressurization in the pressurization process are symmetrical, and the functional principles of forward decompression and reverse decompression in the decompression process are symmetrical; through the interconversion of hydraulic energy and quality piece piston rod kinetic energy, can realize continuous stepless vary voltage under the prerequisite that does not change the pneumatic cylinder structure, and only need adjust the duty cycle of PWM signal, can obtain required hydraulic pressure transformation ratio, control is convenient, simple structure, no vibration and noise.)

1. A hydraulic transformer of a high-speed valve-controlled hydraulic cylinder with a large transformation range for continuous transformation is characterized by comprising a hydraulic cylinder,

the hydraulic oil cylinder is divided into a left cavity and a right cavity, mass blocks are arranged at two ends of a piston rod of the hydraulic oil cylinder, the piston rod and the mass blocks form a mass block piston rod, travel switches are respectively arranged at the ends of travel of the left side and the right side of the mass block piston rod, and the travel switches are triggered when the mass block piston rod reaches the ends of travel of the left side or the right side;

the oil outlet of the high-speed switch valve IV is connected with the left cavity, the oil outlet of the high-speed switch valve V is connected with the right cavity, and the high-speed switch valve IV and the oil inlet of the high-speed switch valve V are connected and then connected with a hydraulic source;

the oil inlet of the high-speed switch valve seventh is connected with the left cavity, the oil inlet of the high-speed switch valve eighth is connected with the right cavity, the oil outlets of the high-speed switch valve seventh and the high-speed switch valve eighth are connected and then connected with the oil inlet of the one-way valve, the oil outlet of the one-way valve is connected with a load, and an oil way for connecting the oil outlet of the one-way valve with the load is also connected with a first energy accumulator;

the pipeline connecting the oil outlet of the high-speed switch valve IV and the left cavity is also connected with the oil tank through a high-speed switch valve III, and the pipeline connecting the oil outlet of the high-speed switch valve V and the right cavity is also connected with the oil tank through a high-speed switch valve VI.

The high-speed switch valve III and the high-speed switch valve VI are powered on and closed, and are powered off and opened; and the high-speed switch valve IV, the high-speed switch valve V, the high-speed switch valve VII and the high-speed switch valve VIII are switched on when power is on, and switched off when power is off.

2. The hydraulic transformer of the continuously variable high-pressure range high-speed valve-controlled hydraulic cylinder according to claim 1, wherein a second energy accumulator is further connected to a pipeline connecting the hydraulic source with the fourth high-speed switch valve and the fifth high-speed switch valve.

3. The method of boosting a hydraulic transformer of claim 1, comprising the steps of:

a1: enabling the third high-speed switch valve and the fourth high-speed switch valve to be electrified, keeping the fifth high-speed switch valve, the sixth high-speed switch valve, the seventh high-speed switch valve and the eighth high-speed switch valve to be electrified, enabling oil liquid of a hydraulic source to enter a left cavity of the hydraulic oil cylinder through the fourth high-speed switch valve, enabling a piston rod of the mass block to move rightwards in an accelerating mode, enabling the oil liquid in the right cavity to flow into an oil tank through the sixth high-speed switch valve, and enabling hydraulic energy to be converted; the load is supplied with liquid by the first energy accumulator;

a2: keeping the high-speed switch valve III and the high-speed switch valve IV powered, enabling the high-speed switch valve VI and the high-speed switch valve VIII powered, enabling oil liquid of a hydraulic source to enter a left cavity through the high-speed switch valve IV, pushing a piston rod of the mass block to move right, enabling the oil liquid of the right cavity to supply a load through the high-speed switch valve VIII, enabling the piston rod of the mass block to decelerate to move right, enabling the kinetic energy of the piston rod of the mass block and hydraulic energy of the hydraulic source to supply the load at the same time; meanwhile, the first energy accumulator is used as an auxiliary power source, and when the instantaneous flow is lower than the average flow, the first energy accumulator supplies oil to ensure that the liquid is stably supplied to the load;

a3: repeating the steps A1-A2 until the mass block piston rod triggers the right-side travel switch, and after the mass block piston rod triggers the right-side travel switch, the right-side travel switch acts to enable the high-speed switch valve five and the high-speed switch valve six to be in a power-on state and enable the rest high-speed switch valves to be in a power-off state;

a4: the high-speed switch valve five and the high-speed switch valve six are in a power-on state, the other high-speed switch valves are in a power-off state, oil liquid of a hydraulic source enters the right cavity through the high-speed switch valve five, the oil liquid of the left cavity enters the oil tank through the high-speed switch valve three, the piston rod of the mass block accelerates to the left, hydraulic energy of the oil liquid of the hydraulic source is converted into kinetic energy of the piston rod of the mass block, and the load is supplied with liquid by the first energy accumulator;

a5: keeping the high-speed switch valve five and the high-speed switch valve six powered, so that the high-speed switch valve three and the high-speed switch valve seven powered, oil of a hydraulic source enters the right cavity through the high-speed switch valve five to push the piston rod of the mass block to move left, oil of the left cavity is supplied to a load through the high-speed switch valve seven, and the piston rod of the mass block decelerates to move left; the kinetic energy of the piston rod of the mass block and the hydraulic energy of the hydraulic source are simultaneously supplied to a load;

a6: repeating the steps A4-A5 until the piston rod of the mass block triggers the left travel switch;

a7: and when the piston rod of the mass block triggers the right travel switch, the right travel switch acts to electrify the high-speed switch valve III and the high-speed switch valve IV, and then the steps A1-A6 are repeated.

4. The method of depressurizing the hydraulic transformer of claim 1, comprising the steps of:

b1: the high-speed switch valve III, the high-speed switch valve IV, the high-speed switch valve VI and the high-speed switch valve VIII are powered on, the high-speed switch valve V and the high-speed switch valve VII are in a power-off state, oil of a hydraulic source enters a left cavity through the high-speed switch valve IV to push a mass block piston rod to move rightwards in an accelerating mode, the oil in the right cavity supplies a load through the high-speed switch valve VIII, a part of hydraulic energy of the hydraulic source is converted into kinetic energy of the mass block piston rod, the energy accumulator I serves as an auxiliary power source, and when the instantaneous flow is lower than the average flow, oil is supplied by the energy accumulator I to guarantee;

b2: keeping the high-speed switch valve six and the high-speed switch valve eight powered on, and the rest high-speed switch valves powered off, wherein due to inertia, the piston rod of the mass block decelerates and moves right, the left cavity absorbs oil through the high-speed switch valve three, oil in the right cavity is supplied to a low-pressure load through the high-speed switch valve eight, and the kinetic energy of the piston rod of the mass block is converted into hydraulic energy;

b3: enabling the high-speed switch valve III, the high-speed switch valve IV, the high-speed switch valve VI and the high-speed switch valve VIII to be electrified, enabling the high-speed switch valve V and the high-speed switch valve VII to be in an electrified state, and repeating the steps B1-B2 until the piston rod of the mass block triggers the right-side travel switch; the right travel switch acts to electrify the high-speed switch valve III, the high-speed switch valve V, the high-speed switch valve VI and the high-speed switch valve VII and to lose the electricity;

b4: the high-speed switch valve III, the high-speed switch valve V, the high-speed switch valve VI and the high-speed switch valve VII are in an electrified state, the high-speed switch valve IV and the high-speed switch valve VIII are in a power-off state, oil liquid of a hydraulic source enters a right cavity through the high-speed switch valve V, a piston rod mass block accelerates to the left, hydraulic oil in the left cavity is supplied to a load through the high-speed switch valve VII, one part of hydraulic energy provided by the hydraulic source is converted into kinetic energy of a piston rod of the mass block, and the other part of hydraulic energy is supplied to the;

b5: the third high-speed switch valve and the seventh high-speed switch valve are powered on, the rest high-speed switch valves are powered off, the piston rod of the mass block continuously decelerates to the left due to inertia, hydraulic oil in the left cavity is supplied to a load through the seventh high-speed switch valve, the right cavity absorbs oil from the oil tank through the sixth high-speed switch valve, and the kinetic energy of the piston rod of the mass block is converted into hydraulic energy supplied to the load;

b6: and repeating the steps B4-B5 until the piston rod of the mass block extends out completely to trigger the left travel switch, and the left travel switch acts to enable the high-speed switch valve III, the high-speed switch valve IV, the high-speed switch valve VI and the high-speed switch valve VIII to be electrified, the high-speed switch valve V and the high-speed switch valve VII to be in an electrified state, and repeating the steps B1-B5.

Technical Field

The invention relates to the field of hydraulic transmission and control, in particular to the field of hydraulic engineering machinery, and particularly relates to a hydraulic transformer of a large-transformation-range high-speed switch valve-controlled hydraulic cylinder with continuous transformation.

Background

The booster hydraulic cylinder is a hydraulic element commonly used in the prior hydraulic technology, and can achieve the effect of boosting or reducing pressure by utilizing the difference of the sectional areas of pistons or plungers in two cylinders which are coaxially connected in series. The pressurizing hydraulic cylinder has the disadvantage that the area ratio of the piston is fixed, namely the transformation ratio is not changed, so that the continuous stepless transformation effect cannot be realized, and the application of the pressurizing hydraulic cylinder is severely limited.

Currently, another widely studied transformation element in the hydraulic transformation technology is a novel hydraulic transformer, which transforms pressure by rotation of a port plate, and can realize pressurization and depressurization, and variable transformation ratio. It has a number of drawbacks: the transformation range is small; the novel hydraulic transformer structure is modified according to the hydraulic pump, so that the novel hydraulic transformer is large in size and low in efficiency; the presence of rotating parts, the noise and vibration caused are large; the novel hydraulic transformer belongs to a nonlinear system, and is difficult to realize accurate control; the load pressure and the load flow correspond to each other, and the flow under the fixed load pressure cannot be controlled, which is determined by the structure.

Disclosure of Invention

The invention aims to provide a hydraulic transformer of a large-transformation-range high-speed switch valve-controlled hydraulic cylinder with continuous transformation, which can realize the transformation ratio variable and realize the continuous stepless transformation function through a travel switch and a control high-speed switch valve so as to overcome the defects of the existing pressurizing hydraulic cylinder.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

a hydraulic transformer of a high-speed valve control hydraulic cylinder with a large variable pressure range for continuous variable pressure comprises a hydraulic oil cylinder, wherein the hydraulic oil cylinder is divided into a left cavity and a right cavity, mass blocks are arranged at two ends of a piston rod of the hydraulic oil cylinder, the piston rod and the mass blocks form a mass block piston rod, travel switches are respectively arranged at the ends of travel at the left side and the right side of the mass block piston rod, and the travel switches are triggered when the mass block piston rod reaches the ends of travel at the left side;

the oil outlet of the high-speed switch valve IV is connected with the left cavity, the oil outlet of the high-speed switch valve V is connected with the right cavity, and the high-speed switch valve IV and the oil inlet of the high-speed switch valve V are connected and then connected with a hydraulic source;

the oil inlet of the high-speed switch valve seventh is connected with the left cavity, the oil inlet of the high-speed switch valve eighth is connected with the right cavity, the oil outlets of the high-speed switch valve seventh and the high-speed switch valve eighth are connected and then connected with the oil inlet of the one-way valve, the oil outlet of the one-way valve is connected with a load, and an oil way for connecting the oil outlet of the one-way valve with the load is also connected with a first energy accumulator;

the pipeline connecting the oil outlet of the high-speed switch valve IV and the left cavity is also connected with the oil tank through a high-speed switch valve III, and the pipeline connecting the oil outlet of the high-speed switch valve V and the right cavity is also connected with the oil tank through a high-speed switch valve VI.

The high-speed switch valve III and the high-speed switch valve VI are powered on and closed, and are powered off and opened; and the high-speed switch valve IV, the high-speed switch valve V, the high-speed switch valve VII and the high-speed switch valve VIII are switched on when power is on, and switched off when power is off.

And as a preferable technical scheme, a second energy accumulator is connected to a pipeline connecting the hydraulic source with the fourth high-speed switch valve and the fifth high-speed switch valve.

The invention also provides a pressurization method of the hydraulic transformer, which comprises the following steps:

a1: enabling the third high-speed switch valve and the fourth high-speed switch valve to be electrified, keeping the fifth high-speed switch valve, the sixth high-speed switch valve, the seventh high-speed switch valve and the eighth high-speed switch valve to be electrified, enabling oil liquid of a hydraulic source to enter a left cavity of the hydraulic oil cylinder through the fourth high-speed switch valve, enabling a piston rod of the mass block to move rightwards in an accelerating mode, enabling the oil liquid in the right cavity to flow into an oil tank through the sixth high-speed switch valve, and enabling hydraulic energy to be converted; the load is supplied with liquid by the first energy accumulator;

a2: keeping the high-speed switch valve III and the high-speed switch valve IV powered, enabling the high-speed switch valve VI and the high-speed switch valve VIII powered, enabling oil liquid of a hydraulic source to enter a left cavity through the high-speed switch valve IV, pushing a piston rod of the mass block to move right, enabling the oil liquid of the right cavity to supply a load through the high-speed switch valve VIII, enabling the piston rod of the mass block to decelerate to move right, enabling the kinetic energy of the piston rod of the mass block and hydraulic energy of the hydraulic source to supply the load at the same time; meanwhile, the first energy accumulator is used as an auxiliary power source, and when the instantaneous flow is lower than the average flow, the first energy accumulator supplies oil to ensure that the liquid is stably supplied to the load;

a3: repeating the steps A1-A2 until the mass block piston rod triggers the right-side travel switch, and after the mass block piston rod triggers the right-side travel switch, the right-side travel switch acts to enable the high-speed switch valve five and the high-speed switch valve six to be in a power-on state and enable the rest high-speed switch valves to be in a power-off state;

a4: the high-speed switch valve five and the high-speed switch valve six are in a power-on state, the other high-speed switch valves are in a power-off state, oil liquid of a hydraulic source enters the right cavity through the high-speed switch valve five, the oil liquid of the left cavity enters the oil tank through the high-speed switch valve three, the piston rod of the mass block accelerates to the left, hydraulic energy of the oil liquid of the hydraulic source is converted into kinetic energy of the piston rod of the mass block, and the load is supplied with liquid by the first energy accumulator;

a5: keeping the high-speed switch valve five and the high-speed switch valve six powered, so that the high-speed switch valve three and the high-speed switch valve seven powered, oil of a hydraulic source enters the right cavity through the high-speed switch valve five to push the piston rod of the mass block to move left, oil of the left cavity is supplied to a load through the high-speed switch valve seven, and the piston rod of the mass block decelerates to move left; the kinetic energy of the piston rod of the mass block and the hydraulic energy of the hydraulic source are simultaneously supplied to a load;

a6: repeating the steps A4-A5 until the piston rod of the mass block triggers the left travel switch;

a7: and when the piston rod of the mass block triggers the right travel switch, the right travel switch acts to electrify the high-speed switch valve III and the high-speed switch valve IV, and then the steps A1-A6 are repeated.

As a preferred technical solution, the present invention further provides a decompression method of the above-mentioned hydraulic transformer, including the steps of:

b1: the high-speed switch valve III, the high-speed switch valve IV, the high-speed switch valve VI and the high-speed switch valve VIII are powered on, the high-speed switch valve V and the high-speed switch valve VII are in a power-off state, oil of a hydraulic source enters a left cavity through the high-speed switch valve IV to push a mass block piston rod to move rightwards in an accelerating mode, the oil in the right cavity supplies a load through the high-speed switch valve VIII, a part of hydraulic energy of the hydraulic source is converted into kinetic energy of the mass block piston rod, the energy accumulator I serves as an auxiliary power source, and when the instantaneous flow is lower than the average flow, oil is supplied by the energy accumulator I to guarantee;

b2: keeping the high-speed switch valve six and the high-speed switch valve eight powered on, and the rest high-speed switch valves powered off, wherein due to inertia, the piston rod of the mass block decelerates and moves right, the left cavity absorbs oil through the high-speed switch valve three, oil in the right cavity is supplied to a low-pressure load through the high-speed switch valve eight, and the kinetic energy of the piston rod of the mass block is converted into hydraulic energy;

b3: enabling the high-speed switch valve III, the high-speed switch valve IV, the high-speed switch valve VI and the high-speed switch valve VIII to be electrified, enabling the high-speed switch valve V and the high-speed switch valve VII to be in an electrified state, and repeating the steps B1-B2 until the piston rod of the mass block triggers the right-side travel switch; the right travel switch acts to electrify the high-speed switch valve III, the high-speed switch valve V, the high-speed switch valve VI and the high-speed switch valve VII and to lose the electricity;

b4: the high-speed switch valve III, the high-speed switch valve V, the high-speed switch valve VI and the high-speed switch valve VII are in an electrified state, the high-speed switch valve IV and the high-speed switch valve VIII are in a power-off state, oil liquid of a hydraulic source enters a right cavity through the high-speed switch valve V, a piston rod mass block accelerates to the left, hydraulic oil in the left cavity is supplied to a load through the high-speed switch valve VII, one part of hydraulic energy provided by the hydraulic source is converted into kinetic energy of a piston rod of the mass block, and the other part of hydraulic energy is supplied to the;

b5: the third high-speed switch valve and the seventh high-speed switch valve are powered on, the rest high-speed switch valves are powered off, the piston rod of the mass block continuously decelerates to the left due to inertia, hydraulic oil in the left cavity is supplied to a load through the seventh high-speed switch valve, the right cavity absorbs oil from the oil tank through the sixth high-speed switch valve, and the kinetic energy of the piston rod of the mass block is converted into hydraulic energy supplied to the load;

b6: and repeating the steps B4-B5 until the piston rod of the mass block extends out completely to trigger the left travel switch, and the left travel switch acts to enable the high-speed switch valve III, the high-speed switch valve IV, the high-speed switch valve VI and the high-speed switch valve VIII to be electrified, the high-speed switch valve V and the high-speed switch valve VII to be in an electrified state, and repeating the steps B1-B5.

Compared with the prior art, the invention has the beneficial effects that:

according to the hydraulic transformer of the high-speed switch valve-controlled hydraulic cylinder with the large variable pressure range and the continuous variable pressure, the movement direction of the piston of the hydraulic cylinder is automatically controlled by changing the working position of the valve core of the high-speed switch valve; the combination of the one-way valve and the high-speed switch valve is utilized to control the flow direction of the oil, and the energy accumulator is additionally arranged, so that the flow flowing to the load through the one-way valve is continuous, the development of the high-speed switch valve is mature, and the throttling in the pressure transformation process can be greatly reduced by using the high-speed switch valve; the integral structure is bilaterally symmetrical, the functional principles of the pressurization process and the decompression process are symmetrical, the functional principles of forward pressurization and reverse pressurization in the pressurization process are symmetrical, and the functional principles of forward decompression and reverse decompression in the decompression process are symmetrical; through the mutual conversion of hydraulic energy and the kinetic energy of the piston rod of the mass block, the continuous stepless voltage transformation can be realized on the premise of not changing the structure of a hydraulic cylinder (the area of a piston), and the required hydraulic voltage transformation ratio can be obtained only by adjusting the duty ratio of a PWM signal, so that the control is convenient; simple structure, no vibration and no noise.

Drawings

FIG. 1 is a schematic diagram of a hydraulic transformer of a continuously variable high-voltage range high-speed switch valve-controlled hydraulic cylinder of the present invention;

in fig. 1: the hydraulic system comprises a 1-hydraulic source, a 2-energy accumulator, a 3-high-speed switch valve, a 4-high-speed switch valve, a 5-high-speed switch valve, a 6-high-speed switch valve, a 7-high-speed switch valve, an 8-high-speed switch valve, a 9-hydraulic oil cylinder, a 10-mass block piston rod, an 11 a-travel switch, an 11 b-travel switch, a 12-one-way valve and a 13-energy accumulator.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.