阅读说明：本技术 一种可调节关闭压力的液压截止阀及液压系统 (Hydraulic stop valve capable of adjusting closing pressure and hydraulic system ) 是由 司少朋 古龙辉 王跃桦 祁路芳 于 2021-06-30 设计创作，主要内容包括：本发明提供了一种可调节关闭压力的液压截止阀及液压系统,包括油端盖、阀体、活塞、调压弹簧、弹簧支撑环、调压端盖、调压螺栓和密封件；其中,油端盖用于密封阀体上部,油端盖与阀体之间设置有密封件；阀体左、右两侧同高度分别开设有往复增压器连接口和液动换向阀连接口,往复增压器连接口在通过开设在阀体左侧的油道与油端盖内开设的油道连通,且油端盖下表面设置有与油端盖内开设的油道连通的出油口；本发明所述的一种可调节关闭压力的液压截止阀及液压系统,由于第一液压截止阀和第二液压截止阀的限压作用,可以保证液压系统液动换向阀阀芯处于确定位置。(The invention provides a hydraulic stop valve capable of adjusting closing pressure and a hydraulic system, which comprise an oil end cover, a valve body, a piston, a pressure adjusting spring, a spring support ring, a pressure adjusting end cover, a pressure adjusting bolt and a sealing piece, wherein the oil end cover is connected with the valve body; the oil end cover is used for sealing the upper part of the valve body, and a sealing element is arranged between the oil end cover and the valve body; the left side and the right side of the valve body are respectively provided with a reciprocating supercharger connecting port and a hydraulic reversing valve connecting port at the same height, the reciprocating supercharger connecting ports are communicated with an oil duct arranged in the oil end cover through oil ducts arranged on the left side of the valve body, and the lower surface of the oil end cover is provided with an oil outlet communicated with the oil duct arranged in the oil end cover; according to the hydraulic stop valve capable of adjusting the closing pressure and the hydraulic system, due to the pressure limiting effect of the first hydraulic stop valve and the second hydraulic stop valve, the valve core of the hydraulic reversing valve of the hydraulic system can be ensured to be in a determined position.)

1. The utility model provides an adjustable hydraulic pressure stop valve who closes pressure which characterized in that: the pressure regulating valve comprises an oil end cover, a valve body, a piston, a pressure regulating spring, a spring support ring, a pressure regulating end cover, a pressure regulating bolt and a sealing piece; the oil end cover is used for sealing the upper part of the valve body, and a sealing element is arranged between the oil end cover and the valve body; the left side and the right side of the valve body are respectively provided with a reciprocating supercharger connecting port and a hydraulic reversing valve connecting port at the same height, the reciprocating supercharger connecting ports are communicated with an oil duct arranged in the oil end cover through oil ducts arranged on the left side of the valve body, and the lower surface of the oil end cover is provided with an oil outlet communicated with the oil duct arranged in the oil end cover; the piston is arranged in the valve body, an annular groove is formed in the outer side of the piston, and the height of the annular groove is the same as that of the reciprocating supercharger connecting port and the hydraulic reversing valve connecting port in the initial position; the bottom of the piston is provided with a spring groove for accommodating a pressure regulating spring, the upper end of the pressure regulating spring is fixedly connected with the bottom of the spring groove, and the lower end of the pressure regulating spring is fixedly connected with a spring support ring; the fixed cover of spring support ring is established in the upper end of pressure regulating bolt's movable rod, and pressure regulating bolt's movable rod passes the pressure regulating end cover that is used for sealed valve body lower part and with the sealed spiro union of pressure regulating end cover.

2. The hydraulic shut-off valve with adjustable closing pressure as claimed in claim 1, wherein: and sealing elements are also arranged between the piston and the pressure regulating end cover and the valve body, and the sealing elements adopt rubber rings.

3. A hydraulic system, characterized by: comprising two hydraulic shut-off valves according to any of claims 1-2, defined as a first hydraulic shut-off valve and a second hydraulic shut-off valve, respectively; the hydraulic reversing valve, the first overflow valve, the second overflow valve, the first sequence valve, the second sequence valve and the reciprocating booster cylinder are further included; the cavity a of the hydraulic reversing valve is communicated with a hydraulic reversing valve connecting port of the first hydraulic stop valve, a reciprocating supercharger connecting port of the first hydraulic stop valve is communicated with an oil inlet of the second sequence valve, an oil outlet of the second sequence valve is communicated with an oil inlet of the second overflow valve, an oil outlet of the second overflow valve is communicated with a T port of the hydraulic reversing valve, and a reciprocating supercharger connecting port of the first hydraulic stop valve is also communicated with a cavity A of the reciprocating supercharger; the hydraulic reversing valve is characterized in that a cavity B of the hydraulic reversing valve is communicated with a hydraulic reversing valve connecting port of a second hydraulic stop valve, a reciprocating supercharger connecting port of the second hydraulic stop valve is communicated with an oil inlet of a first sequence valve, an oil outlet of the first sequence valve is communicated with an oil inlet of a first overflow valve, an oil outlet of the first overflow valve is communicated with a port T of the hydraulic reversing valve, and a reciprocating supercharger connecting port of the second hydraulic stop valve is also communicated with a cavity B of a reciprocating supercharger.

Technical Field

The invention relates to the field of hydraulic systems, in particular to a hydraulic stop valve capable of adjusting closing pressure and a hydraulic system.

Background

The synthetic equipment of the artificial diamond in China is a cubic hydraulic press which adopts an ultrahigh pressure hydraulic system with the oil pressure reaching 100 MPa. The working process of the hydraulic system mainly comprises the following steps: the oil cylinder is emptied, the pressure is quickly increased to 6MPa, then the overpressure is slowly increased to about 100MPa and kept, and finally the pressure relief process is carried out.

The current mainstream overpressure devices are an ultrahigh pressure oil pump and a reciprocating booster, the ultrahigh pressure oil pump can be not limited to overpressure but small in flow within rated pressure, and the reciprocating booster is large in flow but limited to reversing frequency and a reversing control valve. After the piston of the reciprocating supercharger moves to one side, hydraulic oil is needed to drive the hydraulic reversing valve to reverse, so that the piston is controlled to reverse to realize reciprocating motion. The piston is reversed by adopting a proximity switch signaling mode and a mechanical hydraulic reversing valve capable of realizing automatic oil circuit switching, and the valve core of the reversing valve is driven to move by completely depending on control oil by adopting a mechanical structure, which is shown in an attached figure 1. When oil is supplied to the side a, the valve core moves to the right side, P is communicated with A, and B is communicated with T; the piston moves to the limit position, oil is supplied from the oil hole corresponding to the side B, the valve core moves to the left side, at the moment, P and B are communicated, A and T are communicated, the piston moves in the opposite direction, and the system is pressurized by reciprocating circulation.

The position of a valve core of the hydraulic reversing valve in the valve body is uncertain, so that the hole a or the hole b is required to continuously supply control oil to keep the position of the valve core fixed, and therefore when oil is supplied to the side a, the side b is required to be communicated with an oil tank or the side pressure of the side b is lower than the control pressure of the side a; in the same way, the oil supply of the side b needs the oil tank of the side a to be communicated or the pressure of the side a to be lower than the control pressure of the side b. The control oil ports on the two sides of the oil cylinder a and the control oil cylinder b need to be connected with control oil, and the control oil circuit on the other side can also realize an unloading function. Meanwhile, the control oil is led out from the P line and is greatly different from the A, B oil line. Related patents adopt the schemes of a hydraulic reversing valve (CN201711312594. X control oil comes from a P path), a hydraulic control one-way valve, a sequence valve (CN 201810479825.4, CN201510521682.5 and other control oil comes from a A, B oil path) and the like with pistons at two ends in different area ratios, the scheme is theoretically feasible, in the actual operation process, the factors that delay and pressure drop exist in the process that the control oil backs off the hydraulic control one-way valve and a main valve core of the sequence valve due to machining precision, the pressure of the control oil suddenly drops due to the fact that the original pressure pipeline A, B is instantly communicated with T at the moment of switching the oil path of the hydraulic reversing valve, the valve core cannot be driven in place and the like cannot be realized. Therefore, the reciprocating supercharger often has the problem that the valve core position of the hydraulic reversing valve cannot be determined (after the valve core is switched to the middle transition position, the control oil at the two ends is kept equal, namely the control oil at the two ends is kept at high pressure or is unloaded), so that the piston stops moving, the piston cannot be continuously and automatically reversed, and the reciprocating supercharger cannot normally work.

Disclosure of Invention

The invention aims to provide a hydraulic stop valve capable of adjusting closing pressure and a hydraulic system, and aims to solve the problems that the pressure of an oil path is suddenly reduced at the moment of switching the oil path of a hydraulic reversing valve, a valve core cannot be driven in place and the like.

In order to achieve the purpose, the invention adopts the following technical scheme:

a hydraulic stop valve capable of adjusting closing pressure comprises an oil end cover, a valve body, a piston, a pressure adjusting spring, a spring support ring, a pressure adjusting end cover, a pressure adjusting bolt and a sealing piece; the oil end cover is used for sealing the upper part of the valve body, and a sealing element is arranged between the oil end cover and the valve body; the left side and the right side of the valve body are respectively provided with a reciprocating supercharger connecting port and a hydraulic reversing valve connecting port at the same height, the reciprocating supercharger connecting ports are communicated with an oil duct arranged in the oil end cover through oil ducts arranged on the left side of the valve body, and the lower surface of the oil end cover is provided with an oil outlet communicated with the oil duct arranged in the oil end cover; the piston is arranged in the valve body, an annular groove is formed in the outer side of the piston, and the height of the annular groove is the same as that of the reciprocating supercharger connecting port and the hydraulic reversing valve connecting port in the initial position; the bottom of the piston is provided with a spring groove for accommodating a pressure regulating spring, the upper end of the pressure regulating spring is fixedly connected with the bottom of the spring groove, and the lower end of the pressure regulating spring is fixedly connected with a spring support ring; the fixed cover of spring support ring is established in the upper end of pressure regulating bolt's movable rod, and pressure regulating bolt's movable rod passes the pressure regulating end cover that is used for sealed valve body lower part and with the sealed spiro union of pressure regulating end cover.

And sealing elements are also arranged between the piston and the pressure regulating end cover and the valve body, and the sealing elements adopt rubber rings.

A hydraulic system comprising two hydraulic shut-off valves according to any of claims 1-2, defined as a first hydraulic shut-off valve and a second hydraulic shut-off valve, respectively; the hydraulic reversing valve, the first overflow valve, the second overflow valve, the first sequence valve, the second sequence valve and the reciprocating booster cylinder are further included; the cavity a of the hydraulic reversing valve is communicated with a hydraulic reversing valve connecting port of the first hydraulic stop valve, a reciprocating supercharger connecting port of the first hydraulic stop valve is communicated with an oil inlet of the second sequence valve, an oil outlet of the second sequence valve is communicated with an oil inlet of the second overflow valve, an oil outlet of the second overflow valve is communicated with a T port of the hydraulic reversing valve, and a reciprocating supercharger connecting port of the first hydraulic stop valve is also communicated with a cavity A of the reciprocating supercharger; the hydraulic reversing valve is characterized in that a cavity B of the hydraulic reversing valve is communicated with a hydraulic reversing valve connecting port of a second hydraulic stop valve, a reciprocating supercharger connecting port of the second hydraulic stop valve is communicated with an oil inlet of a first sequence valve, an oil outlet of the first sequence valve is communicated with an oil inlet of a first overflow valve, an oil outlet of the first overflow valve is communicated with a port T of the hydraulic reversing valve, and a reciprocating supercharger connecting port of the second hydraulic stop valve is also communicated with a cavity B of a reciprocating supercharger.

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

according to the hydraulic stop valve and the hydraulic system capable of adjusting the closing pressure, due to the pressure limiting effect of the first hydraulic stop valve and the second hydraulic stop valve, the valve core of the hydraulic reversing valve of the hydraulic system can be ensured to be in a determined position, namely when oil is supplied to the cavity A of the hydraulic reversing valve, the valve core of the hydraulic reversing valve moves to the right side, at the moment, P is communicated with A, and B is communicated with T, so that the self-locking of a control oil way is realized, the valve core can be ensured to be fixed at the position of the right side under the stroke, and the piston of the reciprocating supercharger is ensured to move to the right side; when the motion resistance of the piston of the reciprocating booster is increased to the set pressure of the stop valve, the stop valve can automatically disconnect the control oil way of the cavity A of the hydraulic reversing valve, and the pressure of the control oil way of the cavity A is limited below the set pressure. When the piston of the reciprocating supercharger moves to the limit position, as the pressure of the hydraulic oil duct rises, hydraulic oil flows back to the oil tank from the second sequence valve and the second overflow valve through a T port of the hydraulic reversing valve by opening the second sequence valve and the second overflow valve, the pressure of an A cavity of the hydraulic reversing valve is reduced, the valve core of the hydraulic reversing valve moves to the right and left under the action of pressure oil in a control port X, Y, and at the moment, P is communicated with B, and T is communicated with A; therefore, the hydraulic system reciprocates and continuously outputs ultrahigh-pressure oil.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a hydraulic shutoff valve according to the present invention in a conducting state;

FIG. 2 is a schematic structural diagram of a hydraulic stop valve according to the present invention in a stop state;

fig. 3 is a schematic diagram of a hydraulic system according to the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.

As shown in fig. 1 and 2: the invention relates to a hydraulic stop valve capable of adjusting closing pressure, which comprises an oil end cover 1.1, a valve body 1.2, a piston 1.3, a pressure adjusting spring 1.4, a spring support ring 1.5, a pressure adjusting end cover 1.6, a pressure adjusting bolt 1.7 and a sealing piece 1.8, wherein the oil end cover is connected with the pressure adjusting bolt; the oil end cover 1.1 is used for sealing the upper part of the valve body 1.2, and a sealing element 1.8 is arranged between the oil end cover 1.1 and the valve body 1.2; a reciprocating supercharger connecting port 1.9 and a hydraulic reversing valve 2 connecting port 1.0 are respectively arranged at the left side and the right side of the valve body 1.2 at the same height, the reciprocating supercharger connecting port 1.9 is communicated with an oil duct arranged in the oil end cover 1.1 through an oil duct arranged at the left side of the valve body 1.2, and an oil outlet communicated with the oil duct arranged in the oil end cover 1.1 is arranged on the lower surface of the oil end cover 1.1; the piston 1.3 is arranged in the valve body 1.2, an annular groove is formed in the outer side of the piston 1.3, and the height of the annular groove is the same as that of a reciprocating supercharger connecting port 1.9 and a hydraulic reversing valve 2 connecting port 1.0 in the initial position; the bottom of the piston 1.3 is provided with a spring groove for accommodating a pressure regulating spring 1.4, the upper end of the pressure regulating spring 1.4 is fixedly connected with the bottom of the spring groove, and the lower end of the pressure regulating spring 1.4 is fixedly connected with a spring support ring 1.5; the fixed cover of spring support ring 1.5 is established in the upper end of the movable rod of pressure regulating bolt 1.7, and the movable rod of pressure regulating bolt 1.7 passes and is used for the sealed pressure regulating end cover 1.6 of valve body 1.2 lower part and sealed spiro union with pressure regulating end cover 1.6.

Preferably: piston 1.3 and pressure regulating end cover 1.6 and valve body 1.2 between also be provided with sealing member 1.8, sealing member 1.8 adopt the rubber ring, improve hydraulic stop valve's leakproofness.

The working principle of the hydraulic stop valve capable of adjusting the closing pressure is as follows:

in the initial state (the state that the pressure regulating spring 1.4 is not compressed by the piston 1.3 when in the initial position), when the hydraulic oil enters the valve body 1.2 from the connecting port 1.0 of the hydraulic reversing valve 2, because the height of the annular groove is the same as the height of the connecting port 1.9 of the reciprocating booster and the connecting port 1.0 of the hydraulic reversing valve 2, therefore, the hydraulic oil in the valve body 1.2 can flow out from the connecting port 1.9 of the reciprocating booster through the annular groove, in the process, part of the hydraulic oil flows out from the oil outlet on the lower surface of the oil end cover 1.1 through the oil passage arranged on the left side of the valve body 1.2 and the oil passage arranged in the oil end cover 1.1, pressure is generated on the piston 1.3, when the pressure continues to rise, finally, the acting force of the hydraulic oil on the piston 1.3 is larger than the spring force and the system friction force provided by the pressure regulating spring 1.4, the piston 1.3 moves downwards, the annular groove moves downwards along with the downward movement, and a hydraulic oil duct between the connecting port 1.9 of the reciprocating supercharger and the connecting port 1.0 of the hydraulic reversing valve 2 is cut off.

As shown in fig. 3: the hydraulic system comprises two hydraulic stop valves, namely a first hydraulic stop valve 1.11 and a second hydraulic stop valve 1.12; the hydraulic reversing valve 2, a first overflow valve 3.1, a second overflow valve 3.2, a first sequence valve 4.1, a second sequence valve 4.2 and a reciprocating booster cylinder 5 are further included; the cavity a of the hydraulic reversing valve 2 is communicated with a connecting port 1.0 of the hydraulic reversing valve 2 of a first hydraulic stop valve 1.11, a reciprocating supercharger connecting port 1.9 of the first hydraulic stop valve 1.11 is communicated with an oil inlet of a second sequence valve 4.2, an oil outlet of the second sequence valve 4.2 is communicated with an oil inlet of a second overflow valve 3.2, an oil outlet of the second overflow valve 3.2 is communicated with a T port of the hydraulic reversing valve 2, and the reciprocating supercharger connecting port 1.9 of the first hydraulic stop valve 1.11 is also communicated with the cavity A of the reciprocating supercharger; the cavity B of the hydraulic reversing valve 2 is communicated with a connecting port 1.0 of the hydraulic reversing valve 2 of a second hydraulic stop valve 1.12, a reciprocating supercharger connecting port 1.9 of the second hydraulic stop valve 1.12 is communicated with an oil inlet of a first sequence valve 4.1, an oil outlet of the first sequence valve 4.1 is communicated with an oil inlet of a first overflow valve 3.1, an oil outlet of the first overflow valve 3.1 is communicated with a T port of the hydraulic reversing valve 2, and a reciprocating supercharger connecting port 1.9 of the second hydraulic stop valve 1.12 is also communicated with the cavity B of the reciprocating supercharger.

The working principle of the hydraulic system provided by the invention is as follows:

when the hydraulic system is started at any position, hydraulic oil enters from a port 2P of the hydraulic reversing valve, flows back to the oil tank from a port T, at the moment, P is communicated with B, T is communicated with A, and the specific flowing process of the hydraulic oil is as follows: the hydraulic oil enters from a port 2P of the hydraulic reversing valve, enters a connecting port 1.0 of the hydraulic reversing valve 2 of the second hydraulic stop valve 1.12 through a cavity 2B of the hydraulic reversing valve, flows out from a connecting port 1.9 of a reciprocating supercharger of the second hydraulic stop valve 1.12 through an annular groove, enters a cavity B of the reciprocating supercharger, pushes a piston 1.3 (a shaded part) in the reciprocating supercharging cylinder 5 to move leftwards, and outputs ultrahigh-pressure oil, in the process that the piston 1.3 (a shaded part) in the reciprocating supercharging cylinder 5 moves leftwards, a cavity a of the reciprocating supercharger is gradually opened, hydraulic oil in the reciprocating supercharging cylinder 5 flows out from the cavity a of the reciprocating supercharger, enters a cavity A of the hydraulic reversing valve 2 through a connecting port 1.9 of a reciprocating supercharger connecting port 1.11 of a first hydraulic stop valve 1.11 and a connecting port 1.0 of the hydraulic reversing valve 2 of the first hydraulic stop valve 1.11, and finally flows back to an oil tank through a port T of the hydraulic reversing valve 2; in the process, the hydraulic directional control valve 2 always works at the right position under the action of pressure oil in the control port X, Y; in the process, before the hydraulic oil flows out of the reciprocating supercharger connecting port 1.9 of the second hydraulic stop valve 1.12 through the annular groove, part of the hydraulic oil entering the second hydraulic stop valve 1.12 flows out of the oil outlet on the lower surface of the oil end cover 1.1 through an oil duct arranged on the left side of the valve body 1.2 and an oil duct arranged in the oil end cover 1.1, and generates pressure on the piston 1.3 of the second hydraulic stop valve 1.12; in the process, before hydraulic oil enters the cavity A of the hydraulic reversing valve 2 through the connecting port 1.0 of the hydraulic reversing valve 2 of the first hydraulic stop valve 1.11, part of the hydraulic oil entering the first hydraulic stop valve 1.11 flows out of the oil outlet on the lower surface of the oil end cover 1.1 through an oil duct arranged on the left side of the valve body 1.2 and an oil duct arranged in the oil end cover 1.1 to generate pressure on the piston 1.3 of the first hydraulic stop valve 1.11;

with the increase of hydraulic oil entering from the port 2P of the hydraulic reversing valve, when the piston 1.3 in the reciprocating booster cylinder 5 moves to the leftmost end, the hydraulic oil is continuously introduced into the port 2P of the hydraulic reversing valve, so that the pressure of a hydraulic oil duct is increased, the pressure generated by the piston 1.3 of the second hydraulic stop valve 1.12 is continuously increased, and when the opening pressure of the second hydraulic stop valve 1.12 is reached, the piston 1.3 of the second hydraulic stop valve 1.12 moves downwards, the annular groove moves downwards, and the hydraulic oil duct between the connecting port 1.9 of the reciprocating booster and the connecting port 1.0 of the hydraulic reversing valve 2 is cut off; at the moment, as the pressure of the hydraulic oil duct rises, the first sequence valve 4.1 and the first overflow valve 3.1 are opened, hydraulic oil flows back to the oil tank from the first sequence valve 4.1 and the first overflow valve 3.1 through the T port of the hydraulic reversing valve 2, the pressure of the cavity B of the hydraulic reversing valve 2 is reduced, the valve core of the hydraulic reversing valve 2 moves to the right under the action of pressure oil in the control port X, Y, and at the moment, P is communicated with A, and T is communicated with B;

the concrete flow process of the hydraulic oil is as follows: the hydraulic oil enters from a port 2P of the hydraulic reversing valve, enters a connecting port 1.0 of the hydraulic reversing valve 2 of the first hydraulic stop valve 1.11 through a cavity 2A of the hydraulic reversing valve, flows out from a connecting port 1.9 of a reciprocating supercharger of the first hydraulic stop valve 1.11 through an annular groove, enters a cavity a of the reciprocating supercharger, pushes a piston 1.3 (a shaded part) in a reciprocating booster cylinder 5 to move rightwards, and outputs ultrahigh-pressure oil, during the process that the piston 1.3 (a shaded part) in the reciprocating booster cylinder 5 moves rightwards, the cavity B of the reciprocating supercharger is gradually opened, hydraulic oil in the reciprocating booster cylinder 5 flows out from the cavity B of the reciprocating supercharger, enters the cavity B of the hydraulic reversing valve 2 through a connecting port 1.9 of a reciprocating booster of the second hydraulic stop valve 1.12 and a connecting port 1.0 of the hydraulic reversing valve 2 of the second hydraulic stop valve 1.12, and finally flows back to an oil tank through a port T of the hydraulic reversing valve 2; in the process, the hydraulic directional control valve 2 always works in the left position under the action of pressure oil in the control port X, Y; in the process, before the hydraulic oil flows out of the reciprocating supercharger connecting port 1.9 of the first hydraulic stop valve 1.11 through the annular groove, part of the hydraulic oil entering the first hydraulic stop valve 1.11 flows out of the oil outlet on the lower surface of the oil end cover 1.1 through an oil duct arranged on the left side of the valve body 1.2 and an oil duct arranged in the oil end cover 1.1, and generates pressure on the piston 1.3 of the first hydraulic stop valve 1.11; in the process, before hydraulic oil enters a cavity B of the hydraulic reversing valve 2 through a connecting port 1.0 of the hydraulic reversing valve 2 of the second hydraulic stop valve 1.12, part of the hydraulic oil entering the second hydraulic stop valve 1.12 flows out of an oil outlet on the lower surface of the oil end cover 1.1 through an oil duct arranged on the left side of the valve body 1.2 and an oil duct arranged in the oil end cover 1.1, and generates pressure on a piston 1.3 of the second hydraulic stop valve 1.12;

with the increase of the hydraulic oil entering from the port 2P of the hydraulic reversing valve, when the piston 1.3 in the reciprocating pressure cylinder 5 moves to the rightmost end, the hydraulic oil is continuously introduced into the port 2P of the hydraulic reversing valve, so that the pressure of a hydraulic oil duct is increased, the pressure generated by the piston 1.3 of the first hydraulic stop valve 1.11 is continuously increased, when the opening pressure of the first hydraulic stop valve 1.11 is reached, the piston 1.3 of the first hydraulic stop valve 1.11 moves downwards, the annular groove moves downwards, the hydraulic oil duct between the connecting port 1.9 of the reciprocating pressure booster and the connecting port 1.0 of the hydraulic reversing valve 2 is cut off, at the moment, as the pressure of the hydraulic oil duct is increased, the second sequence valve 4.2 and the second overflow valve 3.2 are opened, the hydraulic oil flows back to an oil tank through the T port of the hydraulic reversing valve 2 by the second sequence valve 4.2 and the second overflow valve 3.2, the pressure of the A cavity of the hydraulic reversing valve 2 is reduced, and the hydraulic reversing valve 2 moves left under the action of the pressure oil in the control port X, Y, at the moment, P is communicated with B, and T is communicated with A;

therefore, the hydraulic system reciprocates and continuously outputs ultrahigh-pressure oil.

In the process, due to the pressure limiting effect of the first hydraulic stop valve 1.11 and the second hydraulic stop valve 1.12, the valve core of the hydraulic reversing valve 2 of the hydraulic system can be ensured to be in a determined position, namely when oil is supplied to a cavity of the hydraulic reversing valve 2A, the valve core of the hydraulic reversing valve 2 moves to the right side, at the moment, P is communicated with A, B is communicated with T, the self-locking of a control oil way is realized, the valve core can be ensured to be fixed at the position of the right side under the stroke, and the reciprocating booster piston 1.3 is ensured to move towards the right side; when the motion resistance of the piston 1.3 of the reciprocating booster is increased to the set pressure of the stop valve, the stop valve can automatically disconnect the control oil way of the cavity A of the hydraulic reversing valve 2, and the pressure of the control oil way of the cavity A is limited below the set pressure. When the piston 1.3 of the reciprocating supercharger moves to the limit position, as the pressure of the hydraulic oil channel is increased, by opening the second sequence valve 4.2 and the second overflow valve 3.2, hydraulic oil flows back to the oil tank through the T port of the hydraulic reversing valve 2 from the second sequence valve 4.2 and the second overflow valve 3.2, the pressure of the cavity A of the hydraulic reversing valve 2 is reduced, the valve core of the hydraulic reversing valve 2 moves to the right and left under the action of pressure oil in the control port X, Y, and at the moment, P is communicated with B, and T is communicated with A; therefore, the hydraulic system reciprocates and continuously outputs ultrahigh-pressure oil.

Moreover, by adopting the hydraulic stop valve, the hydraulic reversing valve 2 can adopt the hydraulic reversing valve 2 with standard models (standards such as Lishile, Ulmus oil research and the like), thereby realizing the stable and reliable reversing of the reciprocating booster piston 1.3; when the equipment is out of order, the corresponding fittings can be purchased quickly and conveniently at the local, the downtime is shortened, and the loss is reduced to the minimum.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.