阅读说明：本技术 一种数控泄压阀组 (Numerical control pressure relief valve group ) 是由 古龙辉 祁路方 司少鹏 闫宁 陈亦工 于 2020-11-03 设计创作，主要内容包括：本发明的目的是提供一种超高压数控泄压阀组,用于在提高泄压效率,包括两套结构相同的超高压液控单向阀,两套超高压液控单向阀泄压油出口阻尼不同,用于对不同压力段进行泄压,通过将两套结构相同的超高压液控单向阀的进油部并联,将其中一套超高压液控单向阀的出油部连通到另一套超高压液控单向阀的活塞顶杆与阀芯之间的空隙处,再将空隙处与油箱连通,同时在另一套超高压液控单向阀的出油部通过管道连通至油箱形成泄压阀组,在泄压初始阶段,用阻尼较大的超高压液控单向阀进行泄压,泄压到后期时,用阻尼较小的超高压液控单向阀泄压,提高了泄压效率,同时引入PLC对电磁换向阀进行操作,可通过设定好的时间表对整个泄压过程实现自动化操作。(The invention aims to provide an ultrahigh pressure numerical control pressure relief valve bank for improving pressure relief efficiency, which comprises two sets of ultrahigh pressure hydraulic control one-way valves with the same structure, wherein the two sets of ultrahigh pressure hydraulic control one-way valves have different pressure relief oil outlet dampings and are used for relieving pressure in different pressure sections, the oil inlet parts of the two sets of ultrahigh pressure hydraulic control one-way valves with the same structure are connected in parallel, the oil outlet part of one set of ultrahigh pressure hydraulic control one-way valve is communicated with the gap between the piston mandril and the valve core of the other set of ultrahigh pressure hydraulic control one-way valve, the gap is communicated with an oil tank, the oil outlet part of the other set of ultrahigh pressure hydraulic control one-way valve is communicated with the oil tank through a pipeline to form a pressure relief valve bank, the ultrahigh pressure hydraulic control one-way valve with larger damp is used for relieving pressure in the initial stage of pressure, meanwhile, the PLC is introduced to operate the electromagnetic directional valve, and the whole pressure relief process can be automatically operated through a set time schedule.)

1. The ultrahigh pressure numerical control pressure relief valve bank is characterized in that the ultrahigh pressure hydraulic control check valve comprises an oil inlet part and an oil outlet part, the oil inlet part is communicated with the oil outlet part, the oil outlet part comprises a cavity, a piston ejector rod, an ejector rod bushing and a piston, the ejector rod bushing penetrates through the upper surface of the cavity and is fixedly connected with the cavity, the piston ejector rod penetrates through the ejector rod bushing and the ejector rod bushing to be arranged in a gap, the piston is arranged inside the cavity, a counter bore is formed in the upper end of the piston, the piston ejector rod is fixedly connected with the bottom surface of the counter bore, the oil inlet part of one ultrahigh pressure hydraulic control check valve is communicated with the communication part between the oil inlet part and the oil outlet part of the other ultrahigh pressure hydraulic control check valve, the communication part between the oil inlet part and the oil outlet part of the other ultrahigh pressure hydraulic control check valve is communicated with an oil inlet of the other ultrahigh pressure hydraulic control check valve, and the oil outlet part of the other ultrahigh pressure hydraulic control one-way valve is communicated with an oil tank.

2. The ultrahigh-pressure numerical control pressure relief valve bank according to claim 1, further comprising a return spring, wherein a spring body of the return spring is sleeved on the piston mandril, the upper end of the return spring is fixedly connected with the cavity, and the lower end of the return spring is fixedly connected with the bottom surface of a counter bore of the piston.

3. The ultrahigh pressure numerical control pressure relief valve bank according to claim 1, further comprising a fixing structure for fixing two sets of ultrahigh pressure hydraulic control check valves, wherein the fixing structure is a fixing block, and the two sets of ultrahigh pressure hydraulic control check valves are nested inside the fixing block.

4. The ultrahigh pressure numerical control pressure relief valve bank according to claim 2, characterized in that the tops of the oil inlet portions of the two sets of ultrahigh pressure hydraulic control check valves are flush with the upper surface of the fixed block, the ultrahigh pressure numerical control pressure relief valve bank further comprises a gland, the area of the gland is larger than that of the oil inlet portions of the ultrahigh pressure hydraulic control check valves, and the gland is fixedly connected with the fixed block at the tops of the ultrahigh pressure hydraulic control check valves.

5. The ultrahigh-pressure numerical control pressure relief valve bank according to claim 1, further comprising an oil pump motor for pushing the piston and an electromagnetic directional valve, wherein an oil outlet of the oil pump motor is communicated with the bottom of the piston through the electromagnetic directional valve.

6. The ultrahigh-pressure numerical control pressure relief valve bank according to claim 5, wherein the electromagnetic directional valve is controlled to be started and stopped by a PLC.

Technical Field

The invention belongs to the technical field of ultrahigh pressure relief, and particularly relates to an ultrahigh pressure numerical control pressure relief valve bank.

Background

At present, synthetic equipment of the artificial diamond in China is a cubic press which adopts an ultrahigh pressure hydraulic system with the oil pressure as high as 110 MPa. The super-high pressure oil pump or the reciprocating booster can directly output oil pressure as high as 110MPa to the working cylinder of the cubic press, and the pressure is reduced by draining from the super-high pressure pipeline after the pressing work of the press is finished.

A patent document for CN110354762A discloses a measurement bleeder mechanism, include two upper and lower pressure relief device and be used for respectively carrying out the eccentric shaft of switching to two upper and lower pressure relief device, go up pressure relief device's play oil end and metering device intercommunication, metering device's play oil end and lower pressure relief device's oil inlet end intercommunication, rotation through the eccentric shaft, the last pressure relief oil inflow metering device of pressure relief device after opening, along with the rotation of eccentric shaft, lower pressure relief device is opened, pressure relief oil among the metering device flows into pressure relief device down, finally is discharged.

As shown in fig. 4 (attached to fig. 3 of the original application document), in this patent document, the oil inlet portion of the upper pressure relief device or the lower pressure relief device includes an oil inlet cavity 5, a cone valve 6, and a spring 7, after the pressure relief oil flows into the oil inlet cavity, the spool 8 of the cone valve is jacked up by the mandril under the rotation of the eccentric shaft, and the pressure relief oil in the oil inlet cavity flows downward through the oil guide groove on the spool 8 of the cone valve 6.

This device is used for providing stable linear pressure release, through opening constantly, close pressure relief device, discharge pressure release oil into metering device simultaneously because metering device's volume is fixed, pressure relief device is opened down, when last pressure relief device closes, this fixed volumetric pressure release oil is discharged, therefore can provide stable linear pressure release, because the pressure in initial pressure release stage is big, for the stability during pressure release, the oil that the pressure release flows out at every turn can not be too much, but at the pressure release later stage, because pressure reduces, can discharge pressure release oil more fast, however, metering device's volume is fixed, the oil mass that discharges at every turn is fixed, the pressure release that provides is linear, consequently in the latter half of pressure release process, pressure release efficiency is lower.

Disclosure of Invention

The invention aims to provide an ultrahigh-pressure numerical control pressure relief valve bank which is used for improving the pressure relief efficiency.

The technical scheme for solving the technical problems of the invention is as follows: the utility model provides an ultrahigh pressure numerical control pressure relief valve group, includes the ultrahigh pressure pilot operated check valve that two sets of structures are the same, ultrahigh pressure pilot operated check valve includes oil feed portion, the portion of producing oil, oil feed portion and the portion intercommunication of producing oil, promptly the oil feed portion include into oil chamber, cone valve, spring, the cone valve on seted up and led the oil groove, the portion of producing oil include cavity, piston ejector pin, ejector pin bush, piston, the ejector pin bush passes the higher authority and cavity fixed connection of cavity, the piston ejector pin passes ejector pin bush and ejector pin bush clearance setting, the piston sets up inside the cavity, open the counter bore on the piston, the bottom surface fixed connection of piston ejector pin and counter bore, the intercommunication department between oil feed portion and the portion of producing oil of one of them ultrahigh pressure pilot operated check valve and another ultrahigh pressure pilot operated check valve communicates, intercommunication department and oil tank intercommunication department between the oil feed portion and the portion of another ultrahigh pressure pilot operated check valve communicate, the oil inlet part of one ultrahigh pressure hydraulic control one-way valve is communicated with the oil inlet of the oil inlet part of the other ultrahigh pressure hydraulic control one-way valve, and the oil outlet part of the other ultrahigh pressure hydraulic control one-way valve is communicated with the oil tank.

In order to facilitate the resetting of the piston, the piston rod resetting device further comprises a resetting spring, the spring body of the resetting spring is sleeved on the piston rod, the upper end of the resetting spring is fixedly connected with the cavity, and the lower end of the resetting spring is fixedly connected with the bottom surface of the counter bore of the piston.

In order to fasten two sets of superhigh pressure liquid accuse check valves, still including the fixed knot who is used for fixing two sets of superhigh pressure liquid accuse check valves constructs, fixed knot constructs for the fixed block, and two sets of superhigh pressure liquid accuse check valves are nested inside the fixed block, simultaneously, the space intercommunication between the oil feed portion and the oil outlet portion of one of them superhigh pressure liquid accuse check valve oil outlet portion and another superhigh pressure liquid accuse check valve is realized through lining up the pipeline in that the fixed block is inside, makes the pressure release oil of pressure release in-process flow in that the block is inside, has greatly increased the device's structural strength, also accords with the requirement of superhigh pressure release simultaneously.

The top of the oil feed portion of two sets of superhigh pressure liquid accuse check valves still includes the gland with the upper surface parallel and level of fixed block, the area of gland is greater than the area of the oil feed portion of superhigh pressure liquid accuse check valve, the gland lid is established at the top and the fixed block fixed connection of superhigh pressure liquid accuse check valve, can be convenient for dismantle oil feed portion.

The oil outlet of the oil pump motor is communicated with the bottom of the piston through the electromagnetic directional valve, and power is provided for opening and closing the ultrahigh-pressure hydraulic control one-way valve.

The electromagnetic directional valve is controlled to be started and stopped through the PLC, opening and closing time is controlled to realize automation of pressure relief, the oil pump is always in opening operation during pressure relief work because an oil pump motor is not suitable for high-frequency starting and stopping, and opening and closing of the hydraulic control pressure relief valve are controlled through high-speed opening and closing of the electromagnetic directional valve

The invention has the beneficial effects that: the oil inlet parts of the two sets of ultrahigh pressure hydraulic control one-way valves with the same structure are connected in parallel, the oil outlet part of one set of ultrahigh pressure hydraulic control one-way valve is communicated to the gap between the piston mandril of the other set of ultrahigh pressure hydraulic control one-way valve and the valve core, the gap is communicated with the oil tank, and the oil outlet part of the other set of ultrahigh pressure hydraulic control one-way valve is communicated to the oil tank through a pipeline to form a pressure relief valve bank.

Drawings

Fig. 1 is a schematic diagram of the present invention.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a schematic diagram of the valve timing of the present invention.

Fig. 4 is a schematic structural diagram of an oil inlet in the patent document cited in the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the 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 ultrahigh pressure hydraulic control check valve comprises two sets of ultrahigh pressure hydraulic control check valves with the same structure, each ultrahigh pressure hydraulic control check valve comprises an oil inlet part and an oil outlet part, namely the oil inlet part comprises an oil inlet cavity 5, a cone valve 6 and a spring 7, an oil guide groove is formed in the cone valve 6, the oil outlet part comprises a cavity 1, a piston ejector rod 2, an ejector rod bushing 3 and a piston 4, the oil inlet part is communicated with the oil outlet part, the ejector rod bushing 3 penetrates through the upper surface of the cavity 1 and is fixedly connected with the cavity 1, the piston ejector rod 2 penetrates through the ejector rod bushing 3 and is arranged in a gap with the ejector rod bushing 3, the piston 4 is arranged in the cavity 1, a counter bore is formed in the upper end of the piston 4, the piston ejector rod 2 is fixedly connected with the bottom surface of the counter bore, the oil outlet part of one ultrahigh pressure hydraulic control check valve is communicated with a communication part between the, the gap between the oil inlet part and the oil outlet part of the other ultrahigh pressure hydraulic control one-way valve is communicated with the oil tank 15, the oil inlet part of one ultrahigh pressure hydraulic control one-way valve is communicated with the oil inlet of the oil inlet part of the other ultrahigh pressure hydraulic control one-way valve, and the oil outlet part of the other ultrahigh pressure hydraulic control one-way valve is communicated with the oil tank 15.

In order to facilitate the resetting of the piston, the piston rod resetting device further comprises a resetting spring, the spring body of the resetting spring is sleeved on the piston rod, the upper end of the resetting spring is fixedly connected with the cavity, and the lower end of the resetting spring is fixedly connected with the bottom surface of the counter bore of the piston.

In order to fasten two sets of superhigh pressure liquid accuse check valves, still including the fixed knot who is used for fixing two sets of superhigh pressure liquid accuse check valves constructs, fixed knot constructs for fixed block 9, and two sets of superhigh pressure liquid accuse check valves are nested inside fixed block 9, simultaneously, intercommunication department intercommunication between the oil feed portion of one of which superhigh pressure liquid accuse check valve portion of producing oil and another superhigh pressure liquid accuse check valve and the portion of producing oil is realized through lining up the pipeline in fixed block 9 is inside, makes the pressure release oil of pressure release in-process flow inside the block, has greatly increased the device's structural strength, also accords with the requirement of superhigh pressure release simultaneously.

The top of the oil feed portion of two sets of superhigh pressure liquid accuse check valves and the upper surface parallel and level of fixed block 9 still include gland 10, the area of gland 10 is greater than the area of the oil feed portion of superhigh pressure liquid accuse check valve, gland 10 lid is established at the top and the 9 fixed connection of fixed block of superhigh pressure liquid accuse check valve, can be convenient for dismantle oil feed portion.

The oil pump motor is used for pushing the piston 4, an oil outlet of the oil pump motor is communicated with the bottom of the piston 4 through the electromagnetic directional valve, and power is provided for opening and closing of the ultrahigh pressure hydraulic control one-way valve.

The electromagnetic directional valve is controlled to be started and stopped through the PLC, opening and closing time is controlled to realize automation of pressure relief, the oil pump is always in opening operation during pressure relief work because an oil pump motor is not suitable for high-frequency starting and stopping, and opening and closing of the hydraulic control pressure relief valve are controlled through high-speed opening and closing of the electromagnetic directional valve

In this embodiment, the default left ultrahigh pressure pilot operated check valve pressure relief oil outlet damping is great, and although the structure of two sets of ultrahigh pressure pilot operated check valves is the same, because the pressure relief oil outlet of the left ultrahigh pressure pilot operated check valve is the portion of producing oil, and the pressure relief oil outlet of the right ultrahigh pressure pilot operated check valve is the clearance between oil inlet portion and the portion of producing oil, consequently, left ultrahigh pressure pilot operated check valve pressure relief oil outlet damping is great.

The pressure relief rate V of the hydraulic system is in direct proportion to the pressure relief flow Q, and the V is changed by controlling and adjusting the Q.

The calculation formula of the flow Q of the pressure relief valve is as follows:

q is the flow (L/min) passing through the valve, P is the pressure difference (MPa) between the oil inlet and the oil outlet of the valve,

c is the coefficient (which can be considered substantially constant) and R is the hydraulic damping of the valve.

Left ultrahigh pressure hydraulic control one-way valve hydraulic damping R_{Left side of} = R_{d left side}+ R_ZRight-side ultrahigh pressure hydraulic control one-way valve hydraulic damping R_{Right side} = R_{d right side}。

R_{d left side}: the liquid flow damping is generated in the gap between the valve core 8 of the left side cone valve 6 and the valve seat of the cone valve 6 when the valve core 8 of the left side cone valve 6 is jacked up by the piston mandril 2, the shorter the opening time of the control valve is, the smaller the gap is, the generated liquid resistance R is_{d left side}The larger.

R_Z: damping is generated for the gap between the piston ram 2 and the ram bushing 3.

R_{d right side}: the liquid flow damping is generated by the gap between the right one-way valve core 8 and the valve seat of the cone valve 6 when the piston mandril 2 jacks up, the shorter the opening time of the control valve is, the smaller the gap is, the generated liquid resistance R is_{d right side}The larger.

Controlling t by PLC_ONThe pressure relief flow can be changed by two factors_ONThe PLC controls the time of opening the valve core 8 of the cone valve 6 in the ultrahigh pressure hydraulic control one-way valve of the oil pump motor.

1. Controlling t by PLC_ONThe size can be conveniently changed by the formulaIt is known that a change in R causes the amount of throttling relief oil to change, i.e., changes the rate of relief.

2、t_ONChange in size of t_ON/ T_W The ratio changes, and the average pressure relief flow value is changed. Valve opening time t_ONThe flow rate of time is Q_S，As can be seen from fig. 3: q = Q_S × t_ON/ T_W . Since PLC controls t_ONIs in milliseconds if the control period T_WSet to 3 seconds (i.e., 3000 ms), t_ONThe regulation range of (2) is regulated within 20-3000 ms, and if the increment unit is 10ms, the pressure relief rate ratio is about 300.

In the figure 1, PH is an inlet of high-pressure oil to be decompressed, T is an outlet of the decompressed high-pressure oil, O is an oil return port of an electromagnetic directional valve, and P is an inlet of pressure oil of a control oil pump.

The electromagnetic directional valve has 4 hydraulic fluid ports: p1 (inlet with pressure, oil pump), T1 (oil return port, oil tank), A1 (control A port, here not used, block), B1 (control B port, piston bottom).

When the electromagnetic valve 1CT is powered off, the port B1 of the electromagnetic valve is communicated with the port T1, the piston is pushed by the acting force of a return spring to reset downwards, meanwhile, oil at the bottom of the piston is pushed out to flow back to an oil tank through the port B1 to the port T1 of the electromagnetic directional valve, the port P1 of the electromagnetic valve is communicated with the port A1, but the port A1 is not plugged, and at the moment, the relief valve is closed.

When the electromagnetic valve 1CT is electrified, the port P1 of the electromagnetic valve is communicated with the port B1, the piston controls the pressure of oil to move upwards, the check valve is opened to unload, the port A1 is communicated with the port T1, the port P1 of the electromagnetic valve is communicated with the port A1, but the port A1 is not plugged, and the pressure relief valve is opened at the moment.

In practical application, in the initial stage of pressure relief, the PLC controls the electromagnetic directional valve to push the piston 4 of the left ultrahigh pressure pilot operated check valve to jack up the piston mandril 2 so as to jack up the valve core 8 of the cone valve 6, the pressure relief oil flows into the oil inlet cavity 5 of the oil inlet part, flows into a gap between the piston mandril 2 and the inner wall of the fixed block 9 along an oil guide groove on the valve core 8 of the cone valve 6, then flows downwards through a gap between the mandril bushing 3 and the piston mandril 2, the gap is about one to two threads, the pressure relief oil flowing into the oil outlet part flows into the gap between the valve core 8 of the right ultrahigh pressure pilot operated check valve 6 and the piston mandril 2 through the second channel 12 arranged inside the fixed block 9 and finally flows into the oil tank 15, and when the pressure relief oil flows into the gap between the valve core 8 of the right ultrahigh pressure pilot operated check valve cone valve 6 and the piston mandril 2, a part of the ultrahigh pressure relief oil can flow into the gap between the piston mandril 2 and the mand The oil flows downwards, but the damping is provided, the oil can be ignored, the pressure relief oil in the oil outlet part of the right ultrahigh pressure hydraulic control one-way valve can be communicated with the oil tank 15 through the fourth channel 14, the pressure relief oil is discharged, in the pressure relief process, the time of the valve core 8 of the cone valve 6 in the ultrahigh pressure hydraulic control one-way valve opened by the PLC control oil pump motor is gradually increased every time, as shown in figure 3, the pressure is gradually reduced, the discharge amount of the pressure relief oil is also gradually increased every time, and the process is suitable for pressure relief in a pressure section of 120 MPa-70 MPa.

When the pressure section is in the pressure section of 80-2 MPa, the electromagnetic directional valve on the left side is closed and controlled at the moment, the reversing electromagnetic valve on the right side is used for controlling the opening and closing of the ultrahigh-pressure pilot-controlled check valve on the right side, the pressure relief oil flows into the oil inlet portion of the ultrahigh-pressure pilot-controlled check valve on the right side through the third channel 13, the pressure relief principle of the electromagnetic directional valve is the same as that on the left side, the pressure relief oil directly flows into the oil tank 15 through a gap between the valve core 8 of the cone valve 6 and the piston ejector rod 2, and the pressure relief oil in the oil outlet portion of the ultrahigh-.

According to the invention, the oil inlet parts of two sets of ultrahigh pressure hydraulic control one-way valves with the same structure are connected in parallel, the oil outlet part of one set of ultrahigh pressure hydraulic control one-way valve is communicated to the gap between the piston mandril of the other set of ultrahigh pressure hydraulic control one-way valve and the valve core, then the gap is communicated with the oil tank, and the oil outlet part of the other set of ultrahigh pressure hydraulic control one-way valve is communicated to the oil tank through a pipeline to form a pressure relief valve group.