Ultrahigh-pressure hydraulic pressure cylinder

Abstract

The utility model relates to the technical field of ultrahigh-pressure hydraulic equipment, and mainly discloses an ultrahigh-pressure hydraulic pressure cylinder which comprises a cylinder barrel, a front end cover, a rear end cover, a piston, a piston rod and a high-pressure cylinder, the front end and the rear end of the cylinder barrel are connected with the front end cover and the rear end cover respectively, a displacement sensor is installed on the rear end cover, and the front end cover is connected with the high-pressure cylinder in a sealed mode. An oil inlet is formed in the rear end cover, an oil return opening is formed in the front end cover, the piston is connected into the cylinder barrel in a sealed and sliding mode, one end of the piston rod is fixedly connected with the piston, the other end of the piston rod penetrates through the front end cover to be connected into the high-pressure cylinder in a sliding mode, and a liquid inlet and a liquid outlet are formed in the high-pressure cylinder. The selection of materials of sealing pieces in the high-pressure cylinder and the cylinder barrel and the design of a sealing structure are suitable for the ultrahigh-pressure pressurizing cylinder, the sealing effect is good, and the corrosion phenomenon is not prone to occurring. The front end cover, the rear end cover and the high-pressure cylinder are designed in a split mode, disassembly is convenient, and maintenance is convenient. The displacement sensor enables the pressure cylinder to be high in control precision and good in responsiveness.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-high pressure hydraulic equipment, in particular to an ultra-high pressure hydraulic booster cylinder. Background Art

[0002] At present, booster cylinders have been widely used in many fields. With the increase of people's needs during use, the types of booster cylinders are also increasing. Common booster cylinders can be divided into pneumatic booster cylinders, hydraulic booster cylinders and gas-liquid booster cylinders. Among them, pneumatic booster cylinders have the advantages of easy access to compressed air, clean and environmentally friendly, hydraulic booster cylinders have the advantages of high output force and incompressible hydraulic oil, and gas-liquid booster cylinders have attracted widespread attention because they combine the advantages of the above two types of booster cylinders. The boost pressure of ordinary booster cylinders is relatively small, and the output pressure is generally around 40Mpa, and can reach up to 90Mpa. At present, ordinary booster cylinders on the market, such as gas-liquid booster cylinders, generally include oil storage cylinders, booster cylinders and pre-pressurization cylinders. The working principle is that the hydraulic oil is first pressurized once in the oil storage cylinder, and then enters the booster cylinder for secondary pressurization, thereby pushing the punch rod in the pre-pressurization cylinder to punch the object. This type of booster cylinder is widely used in various mechanical manufacturing equipment fields such as stamping, extrusion, and molding.

[0003] The application field of booster cylinder is very wide, not only limited to mechanical manufacturing, but also can be used in oil extraction, various tests or water cutting and other fields. Specifically, it is often used for oil well water injection, oil production, pressure test, explosion test, high-pressure gas cylinder test, high-pressure liquid test or water jet cutting, etc. In these fields, the output pressure is often required to be ultra-high pressure. The ultra-high pressure booster cylinder can easily generate ultra-high pressure of more than 100Mpa, up to 400-600Mpa. The gas medium it outputs is diverse, which can be high-temperature gas, flammable gas or explosive gas, etc., and the liquid medium can be water, hydraulic oil or emulsion, etc. Commonly used ultra-high pressure booster cylinders can be divided into two types according to the driving method: gas drive and liquid drive. Structurally, an ultra-high pressure hydraulic booster cylinder usually includes a low-pressure oil cylinder and an ultra-high pressure cylinder. Referring to a pressure test hydraulic booster device disclosed in Chinese invention patent CN102996535A, a design of connecting a large diameter piston and a small diameter plunger is adopted. A specific pressure ratio is generated through the area ratio of the two pistons, thereby obtaining the required high-pressure fluid output. The output pressure of the fluid depends on the pressure of the driving medium and the area ratio of the two pistons.

[0004] The following technical problems exist in the prior art: First, the existing seals and parts materials are mainly suitable for medium and low pressure environments, and their anti-corrosion and ultra-high pressure resistance performance is poor. Under the action of ultra-high pressure output pressure for a long time, seal leakage is prone to occur, especially when the output medium is water, the corrosion problem will be more serious. Secondly, the existing high-pressure cylinder and end cover adopt an integrated design, which is connected to the flange of the low-pressure cylinder by screws. This design is quite inconvenient to disassemble and replace when the seal needs to be repaired due to corrosion or wear. In addition, the installation of the oil port of the oil cylinder and the servo control valve block or other types of control valve groups in the existing structure is not convenient enough. The connection through the pipeline will not only cause pressure loss, but also may cause the booster cylinder to respond slowly, and there is also a risk of leakage or bursting of the pipeline. Finally, the existing system does not use a displacement sensor for control, so it cannot form a closed-loop control with the servo valve or other control valve group, which directly affects the control accuracy. Utility Model Content

[0005] The purpose of the utility model is to provide an ultra-high pressure hydraulic booster cylinder to solve the problems existing in the above-mentioned prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an ultra-high pressure hydraulic booster cylinder, an ultra-high pressure hydraulic booster cylinder, comprising a cylinder barrel, a front end cover, a rear end cover, a piston, a piston rod and a high pressure cylinder. The front and rear ends of the cylinder barrel are respectively sealed and connected with the rear end of the front end cover and the front end of the rear end cover. A displacement sensor is installed at the rear end of the rear end cover, and the front end of the front end cover is sealed and connected with the high pressure cylinder. An oil inlet is provided on the rear end cover, and an oil return port is provided on the front end cover. The piston is sealed and slidably connected in the cylinder barrel, the rear end of the piston rod is fixedly connected to the piston, and the front end of the piston rod passes through the front end cover and is slidably connected in the high pressure cylinder. The high pressure cylinder is provided with an inlet for inputting liquid medium and an outlet for outputting ultra-high pressure medium, and the high pressure cylinder is connected with a test device or other equipment. A first sealing assembly is provided between the piston rod and the front end cover, and a second sealing assembly is provided between the cylinder barrel and the piston.

[0007] A further solution of the utility model is that the first sealing assembly includes a copper sleeve, a high-pressure seal, a support sleeve, a step seal and a guide belt for the shaft, which are arranged on the inner wall of the front cover from front to back. The copper sleeve and the support sleeve are both annular, wherein the copper sleeve is made of tin bronze, and the copper sleeve and the support sleeve cooperate to fix the high-pressure seal. The step seals are arranged in two intervals in sequence. The second sealing assembly includes a grid ring and a hole guide belt arranged on the outer wall of the piston, and the hole guide belt is respectively located on the front and rear sides of the grid ring. Through the above technical solution, the utility model can withstand high-pressure impact through a unique sealing design and a sealing material selection, and the sealing gap is reduced by the copper sleeve, while providing a good guiding and auxiliary sealing effect for the piston rod. The step seal between the piston rod and the front cover, the grid ring sealing structure between the piston and the rear cover, and the material selection can achieve the performance of ultra-high pressure sealing to meet the use, have good guiding and plasticity, and can maintain a good sealing effect even if it is deformed under ultra-high pressure use conditions. The sealing combination design makes the starting pressure of the booster cylinder small, the friction is low, and the sealing effect is good.

[0008] A further solution of the utility model is that the high-pressure seal includes a sealing ring and a rubber O-ring on the end face of the sealing ring. A gap is arranged between the sealing ring and the copper sleeve. The rubber O-ring is close to one side of the copper sleeve. The contact surface between the sealing ring and the support sleeve is an inclined surface. The inclined surface of the sealing ring is inclined toward the axis of the sealing ring along the direction from front to rear. The sealing ring is machined from PEK material. Under the action of high pressure, the inclined surface of the sealing ring squeezes the inclined surface of the support sleeve, causing a slight deformation of the high-pressure seal, so that the inside and outside of the sealing ring are tightly attached to the inner hole of the front cover and the piston rod, thereby achieving a better sealing effect.

[0009] A further solution of the utility model is that the piston rod and the high-pressure cylinder are made of titanium alloy TC4 material to prevent deformation under ultra-high pressure conditions, and also achieve the purpose of corrosion resistance even if the medium on the boost side is various media. The high-pressure cylinder body is made of titanium alloy, which has good mechanical properties, is more durable, has stronger ultra-high pressure resistance, and has better corrosion resistance.

[0010] A further solution of the utility model is that the diameter ratio of the piston and the piston rod is 100:22. Preferably, the diameter of the piston is 100 mm and the diameter of the piston rod is 22 mm, which increases the pressure increase ratio and achieves a pressure increase ratio data of 20.6:1. When the cylinder working pressure is 19.4 MPa, an ultra-high pressure output of 400 MPa is guaranteed.

[0011] A further solution of the utility model is that flanges are installed at both ends of the cylinder, and the flanges are threadedly connected to the two ends of the cylinder.

[0012] A further solution of the utility model is that the front end cover is connected to the flange of the front end of the cylinder barrel by a third fastening screw, the rear end cover is fixed to the flange of the rear end of the cylinder barrel by a second fastening screw, and the high-pressure cylinder is connected to the front end cover by a fourth fastening screw; the rear end of the front end cover and the front end of the rear end cover are respectively provided with a first cylindrical flange, and the first cylindrical flanges on the front end cover and the rear end cover are respectively inserted into the two ends of the cylinder barrel. Between the front end of the cylinder barrel and the outer wall of the first cylindrical flange at the rear side end of the front end cover, a first O-ring and a first retaining ring are sequentially arranged from back to front; between the rear end of the cylinder barrel and the outer wall of the first cylindrical flange at the front side end of the rear end cover, a first O-ring and a first retaining ring are sequentially arranged from front to back, a circular groove is arranged at the rear side end of the high-pressure cylinder, and a second cylindrical flange is arranged at the front side end of the front end cover, and the second cylindrical flange is inserted into the circular groove to form two matching surfaces. The outer cylindrical surface of the second cylindrical flange and the inner cylindrical surface of the circular groove are sequentially arranged from back to front with a second retaining ring and a second O-ring. At the same time, a fourth O-ring is arranged between the front end surface of the second cylindrical flange of the front end cover and the rear end surface of the circular groove of the high-pressure cylinder 7.

[0013] A further solution of the utility model is that the sealing measuring rod of the displacement sensor is sealingly connected to the rear end face of the rear end cover, the displacement sensor is fixedly connected to the rear end side of the rear end cover by threads, and the sealing measuring rod of the displacement sensor passes through the rear end cover.

[0014] The piston is provided with a magnetic ring of a displacement sensor, and the whole formed by the magnetic ring, the piston and the piston rod is slidably connected with the sealing measuring rod of the displacement sensor, and the sealing measuring rod is coaxial with the piston and the piston rod. A magnetic isolation ring is provided on the outer side of the magnetic ring, and the magnetic ring and the magnetic isolation ring are connected to the end face of the piston through a first fastening screw.

[0015] A further solution of the utility model is that a sensor shield is arranged on the outer side of the displacement sensor, and the sensor shield is connected to the rear end surface of the rear end cover through a fifth fastening screw.

[0016] A further solution of the utility model is that an oil inlet chamber is provided in the rear end cover, the oil inlet port is connected to the oil inlet chamber, an oil return chamber is provided in the front end cover, the oil return port is connected to the oil return chamber, an oil storage chamber is provided in the cylinder barrel, the two sides of the oil storage chamber are respectively connected to the oil inlet chamber and the oil return chamber, the oil inlet chamber and the oil return chamber are coaxial with the piston and the piston rod, and the oil inlet chamber can increase the force area of ​​the piston rod, so that the piston moves more smoothly.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. The utility model is specially designed for ultra-high pressure boost cylinder. Through the selection of materials for each seal and the design of the sealing structure, the problems of poor sealing effect and easy corrosion in the prior art are solved. On the cylinder side, high-speed and low-friction oil cylinder sealing forms such as Gly ring and Step seal are adopted; while the high-pressure seal on the high-pressure cylinder side adopts a unique sealing method of bevel turning seal combined with copper sleeve support. Such a design not only realizes the performance requirements of ultra-high pressure and fast sealing, but also the selected material itself has good guiding and plasticity, and can maintain a good sealing effect even in the case of high-pressure deformation. The unique sealing design and the sealing material selection of PEK material can withstand high-pressure impact. At the same time, the copper sleeve not only reduces the sealing gap between the piston rod and the front cover, but also provides good guiding and auxiliary sealing functions. This series of sealing combination designs reduces the starting pressure of the boost cylinder to 0.1MPa, reduces friction, and greatly improves the sealing effect. In addition, the piston rod and the high-pressure cylinder body are made of titanium alloy TC4, which not only prevents deformation under ultra-high pressure conditions, but also effectively resists corrosion from various boost side media.

[0019] 2. The utility model has a separate design for the end covers at both ends of the cylinder barrel, and the ultra-high pressure cylinder and the end covers. During the design process, special consideration was given to the need for the two oil ports of the cylinder barrel to be directly connected to the corresponding servo valve block. In order to ensure that the installation process is simple and reliable, and to maximize the effect of the servo valve group, the utility model designs the mounting surfaces of the front and rear end covers to be on the same horizontal plane, and connects the cylinder barrel and the cylinder body flange into one through threads, and then connects the end covers and the front end cover at both ends of the cylinder barrel to the high pressure cylinder through a pull rod, so that the piston rod of the left cylinder barrel can also be used as the plunger of the right booster cylinder, thereby ensuring that the pressure of the cylinder barrel can be directly and efficiently transmitted to the high pressure cylinder side, significantly reducing the pressure loss.

[0020] 3. The utility model improves control accuracy and enhances responsiveness by equipping the boost cylinder with a displacement sensor and forming a closed-loop control with the servo control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the overall structure of the booster cylinder of the utility model;

[0023] Figure 2 For this utility model Figure 1A schematic diagram of the structure enlargement in the middle;

[0024] Figure 3 For this utility model Figure 1 A magnified schematic diagram of the structure at B in the middle;

[0025] Figure 4 It is a top view of the utility model;

[0026] Figure 5 It is a side view of the utility model.

[0027] In the figure: 1, cylinder barrel, 2, flange, 3, front cover, 4, rear cover, 5, piston rod, 6, piston, 7, high pressure cylinder, 8, sensor cover, 9, copper sleeve, 10, first O-ring, 11, first retaining ring, 12, second O-ring, 13, second retaining ring, 14, fourth O-ring, 15, hole guide belt, 16, high pressure seal, 17, Gley ring, 18, Step seal, 19, third O-ring, 20, third retaining ring, 21, shaft guide belt, 22, displacement sensor, 23, magnetic Ring, 24, magnetic isolation ring, 25, first fastening screw, 26, second fastening screw, 27, third fastening screw, 28, fourth fastening screw, 29, fifth fastening screw, 30, sealing measuring rod, 31, support sleeve, 32, oil inlet, 33, oil return port, 34, oil inlet chamber, 35, oil storage chamber, 36, oil return chamber, 37, liquid outlet, 38, liquid inlet, 39, first cylindrical flange, 40, second cylindrical flange, 41, circular groove, 42, sealing ring, 43, rubber O-ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the present invention, "front", "back", "inside" and "outside" only represent relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0030] Example 1

[0031] like Figure 1-4 As shown, in the accompanying drawings, the right side is the relative front end, and the left side is the relative rear end. An ultra-high pressure hydraulic booster cylinder includes a cylinder barrel 1, a front end cover 3, a rear end cover 4, a piston 6, a piston rod 5 and a high pressure cylinder 7.

[0032] The front and rear ends of the cylinder barrel 1 are respectively sealed and connected to the rear end of the front cover 3 and the front end of the rear cover 4. The rear end of the rear cover 4 is equipped with a displacement sensor 22, and the front end of the front cover 3 is sealed and connected to the high-pressure cylinder 7. The rear end cover 4 is provided with an oil inlet 32, and the front end cover 3 is provided with an oil return port 33.

[0033] The piston 6 is sealingly and slidably connected in the cylinder 1, the rear end of the piston rod 5 is fixedly connected to the piston 6, the piston rod 5 is coaxial with the piston 6, and the matching surfaces of the piston rod 5 and the piston 6 are sequentially provided with a third O-ring 19 and a third retaining ring 20 from back to front, and the third O-ring 19 and the third retaining ring 20 are both provided on the inner wall of the piston 6. The front end of the piston rod 5 passes through the front end cover 3 and is slidably connected in the high-pressure cylinder 7.

[0034] The high-pressure cylinder 7 is provided with a liquid inlet 38 for outputting liquid medium and a liquid outlet 37 for outputting ultra-high-pressure medium. The high-pressure cylinder 7 is connected to a test device or other equipment.

[0035] A first sealing assembly is provided between the piston rod 5 and the front end cover 3, and a second sealing assembly is provided between the cylinder 1 and the piston 6. Specifically, the first sealing assembly includes a copper sleeve 9, a high pressure seal 16, a support sleeve 31, a step seal 18 and a shaft guide belt 21 which are arranged on the inner wall of the front end cover 3 from front to back. The copper sleeve 9 and the support sleeve 31 are both annular, wherein the copper sleeve 9 is made of tin bronze, and the copper sleeve 9 and the support sleeve 31 cooperate to fix the high pressure seal 16. Two step seals 18 are arranged in sequence. The second sealing assembly includes a grid ring 17 and a hole guide belt 15 which are arranged on the outer wall of the piston 6, and the hole guide belt 15 is respectively located on the front and rear sides of the grid ring 17. The step seal 18, the grid ring 17, the hole guide belt 15 and the shaft guide belt 21 are all prior art and are well known to those skilled in the art. The step seal, as a combined seal, is composed of a rubber O-ring and a polytetrafluoroethylene ring, and is particularly suitable for the sealing requirements of reciprocating plungers and piston rods. It has low friction and excellent leakage control ability, so it is widely used in hydraulic cylinders, excavators, loaders and other equipment to ensure effective sealing in various working media and working conditions. Step seal is a one-way seal and is often used for piston rod sealing. On the other hand, Glyd ring is also a seal made of rubber O-ring and polytetrafluoroethylene. It has low friction, high pressure resistance and wide temperature adaptability. Contact stress is generated through its elastic deformation, thereby effectively preventing liquid leakage. Glyd rings are widely used in many fields such as petrochemicals, aerospace, etc., and are regarded as an indispensable component in the field of industrial sealing. Glyd rings are bidirectional seals and are often used for piston sealing. The guide belt for holes, also known as the guide ring for holes, is an important sealing and guiding element in equipment such as hydraulic cylinders or cylinders. Its main function is to support the movement of the piston or piston rod to prevent it from direct contact with the cylinder body and wear. This guide belt has the characteristics of wear resistance, low friction, heat resistance and strong chemical stability. It is usually made of PTFE, NBR, PU, ​​POM, PA and other materials, and can be used in the temperature range of -55℃ to +225℃. Hole guide belts are widely used in sealing and guiding various hydraulic oils, flame retardant liquids, water, gas and other media, playing a key role in improving equipment performance and extending service life. Shaft guide belts, also known as shaft guide rings, are a part of sealing products. They mainly play a guiding role, can prevent wear between the cylinder barrel and the piston rod, and absorb vibration. It is extremely wear-resistant, has a low friction coefficient, and is heat-resistant and chemical-resistant. It is widely used in motion management mechanisms such as oil cylinders and air cylinders to ensure the stability of bearings and extend the service life of equipment.

[0036] Through the above technical scheme, the utility model can withstand high-pressure impact through unique sealing design and sealing material selection. Specifically, the copper sleeve 9 is used to reduce the sealing gap between the piston rod 5 and the front cover 3, which not only provides good guidance for the piston rod 5, but also plays a role of auxiliary sealing. A step seal 18 is used between the piston rod 5 and the front cover 3, and a Gly ring 17 is selected between the piston 6 and the cylinder 1. Such a sealing structure and material selection ensure that the performance of the high-pressure seal 16 meets the use requirements. The selected material has good guiding and plasticity, and can maintain a good sealing effect even if it is deformed under ultra-high pressure use conditions. The overall sealing combination design enables the boost cylinder to have the advantages of low starting pressure, low friction and good sealing effect.

[0037] like Figure 2 As shown, the high-pressure seal 16 includes a sealing ring 42 and a rubber O-ring 43 on its end face. The sealing ring 42 is made of PEK material by turning. A gap is set between the sealing ring 42 and the copper sleeve 9. The rubber O-ring 43 is close to the copper sleeve 9. The contact surface between the sealing ring 42 and the support sleeve 31 is an inclined surface. The inclined surface of the sealing ring 42 is inclined toward the axis of the sealing ring along the direction from front to back. Under the action of high pressure, the inclined surface of the sealing ring 42 squeezes the inclined surface of the support sleeve 31, causing the high-pressure seal 16 to deform slightly, so that the inner and outer surfaces of the sealing ring 42 are respectively close to the inner surface of the front cover 3 and the outer surface of the piston rod 5, thereby achieving a better sealing effect.

[0038] A further solution of the utility model is that the piston rod 5 and the high-pressure cylinder 7 are made of titanium alloy TC4, which can effectively prevent deformation under ultra-high pressure conditions and has excellent anti-corrosion performance, and is suitable for various boost side media.

[0039] The diameter ratio of the piston 6 and the piston rod 5 is 100:22. Preferably, the diameter of the piston 6 in this embodiment is 100 mm, and the diameter of the piston rod 5 is 22 mm. Such a design expands the pressure increase ratio and achieves a pressure increase ratio data of 20.6:1. Therefore, when the working pressure of the cylinder is 19.4 MPa, it can ensure that the output ultra-high pressure reaches 400 MPa.

[0040] During the design, it was considered that the two oil ports of the cylinder barrel 1 should be directly connected to the corresponding servo valve block. To ensure simple and reliable installation and the best effect of the servo valve group, the servo valve group is directly connected to the cylinder barrel 1. To this end, the standard style of the tie rod oil cylinder is adopted on the side of the cylinder barrel 1, so that the installation surfaces of the front and rear covers are on the same horizontal plane. The cylinder barrel 1 and the cylinder body flange are tightly connected into one by threads, and then the front end cover of the cylinder barrel 1 is connected to the high-pressure cylinder 7 by a tie rod, so that the piston rod 5 of the left cylinder barrel 1 can also be used as the plunger of the right high-pressure cylinder 7, ensuring that the force of the oil cylinder is directly transmitted to the high-pressure cylinder 7 side, thereby significantly reducing the pressure loss.

[0041] Specifically, in this embodiment, the end covers at both ends of the cylinder barrel 1, the high-pressure cylinder and the front end cover are designed to be separated. Figure 1 , flanges 2 are installed at both ends of the cylinder 1. The cylinder 1 is cylindrical, and external threads are respectively arranged on the outer circumferential surfaces of the front and rear ends thereof, and the flange 2 is threadedly connected to the two ends of the cylinder 1. The flange 2, the front end cover 3 and the rear end cover 4 are evenly opened on the circumference. The main body of the front end cover 3 is a rectangular parallelepiped, and the front end cover 3 is connected to the flange 2 at the front end of the cylinder 1 through the third fastening screw 27; the main body of the rear end cover 4 is also a rectangular parallelepiped, and the rear end cover 4 is fixedly connected to the flange 2 at the rear end of the cylinder 1 through the second fastening screw 26. The rear end of the front end cover 3 and the front end of the rear end cover 4 are respectively provided with a first cylindrical flange 39, and the first cylindrical flanges 39 on the front end cover 3 and the rear end cover 4 are respectively inserted into the two ends of the cylinder 1. Between the front end of the cylinder 1 and the outer wall of the first cylindrical flange 39 at the rear end of the front cover 3, a first O-ring 10 and a first retaining ring 11 are arranged in sequence from back to front; between the rear end of the cylinder 1 and the outer wall of the first cylindrical flange at the front end of the rear cover 4, a first O-ring 10 and a first retaining ring 11 are arranged in sequence from front to back, see Figure 5 The main body of the high-pressure cylinder 7 is cylindrical, and the high-pressure cylinder 7 is connected to the front cover 3 by the fourth fastening screw 28. A circular groove 41 is provided at the rear side end of the high-pressure cylinder 7, and a second cylindrical flange 40 is provided at the front side end of the front cover 3. The second cylindrical flange 40 is inserted into the circular groove 41 to form two matching surfaces. The outer cylindrical surface of the second cylindrical flange 40 and the inner cylindrical surface of the circular groove 41 are provided with a second retaining ring 13 and a second O-ring 12 in sequence from back to front. At the same time, a fourth O-ring 14 is provided between the front end surface of the second cylindrical flange of the front cover 3 and the rear end surface of the circular groove of the high-pressure cylinder 7.

[0042] The rear end cover 4 is provided with an oil inlet chamber 34, and the oil inlet port 32 is connected to the oil inlet chamber 34. The front end cover 3 is provided with an oil return chamber 36, and the oil return port 33 is connected to the oil return chamber 36. The cylinder barrel 1 is provided with an oil storage chamber 35, and the two sides of the oil storage chamber 35 are respectively connected to the oil inlet chamber 34 and the oil return chamber 35, and the oil inlet chamber 34 and the oil return chamber 36 are coaxial with the cylinder barrel 1.

[0043] In order to make the displacement sensor 22 and the servo control form a closed-loop system, the displacement data of the piston 6 can be accurately obtained to ensure high control accuracy and good responsiveness. Figure 1As shown, in this embodiment, the displacement sensor 22 is a displacement sensor 22 dedicated to the oil cylinder, and its structure and principle are prior art, which will not be described here. The scheme for connecting the displacement sensor 22 with the above-mentioned booster cylinder is that: the sealing measuring rod of the displacement sensor 22 is sealed and connected to the rear end face of the rear end cover 4, the displacement sensor 22 is fixedly connected to the rear end side of the rear end cover 4 by threads, and the sealing measuring rod 30 of the displacement sensor 22 passes through the rear end cover 4. The piston 6 is provided with a magnetic ring 23 of the displacement sensor 22, and the whole composed of the magnetic ring 23, the piston 6 and the piston rod 5 is slidably connected with the sealing measuring rod 30 of the displacement sensor 22, and the sealing measuring rod 30 is coaxial with the piston 6 and the piston rod 5. The outer side of the magnetic ring 23 is provided with a magnetic isolation ring 24, and the magnetic ring 23 and the magnetic isolation ring 24 are connected to the end face of the piston 6 through the first fastening screw 25. The outer side of the displacement sensor 22 is provided with a sensor shield 8, and the sensor shield 8 is connected to the rear end face of the rear end cover 4 through the fifth fastening screw 29.

[0044] The assembly process of the ultra-high pressure hydraulic booster cylinder of this embodiment is as follows: first, assemble the booster cylinder and install the seals. Next, install the piston 6, the magnetic ring assembly and the piston rod 5 into the cylinder 1. Then, install two flanges 2 at both ends of the cylinder 1. After that, insert the rear end of the front cover 3 and the front end of the rear cover 4 into the two ends of the cylinder 1 respectively, and fix them with the third fastening screw 27 and the second fastening screw 26. Finally, install the high pressure cylinder 7, the displacement sensor 22 and the sensor shield 8 on the front cover 3 and the rear cover 4 respectively. After completing these steps, the overall structure of the booster cylinder is assembled.

[0045] When in use, hydraulic oil is filled into the oil inlet chamber 34 through the oil inlet port 32, and the hydraulic oil in the oil storage chamber 35 returns through the oil return chamber 36 and the oil return port 33, driving the piston 6 and the piston rod 5 to move in one direction. The piston rod 5 acts as the plunger of the high-pressure cylinder 7 to pressurize the medium in the high-pressure cylinder 7 and output the ultra-high-pressure medium through the liquid outlet 37 of the high-pressure cylinder 7.

[0046] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An ultra-high pressure hydraulic booster cylinder, characterized in that: The invention comprises a cylinder barrel (1), a front end cover (3), a rear end cover (4), a piston (6), a piston rod (5) and a high-pressure cylinder (7); the front and rear ends of the cylinder barrel (1) are respectively sealedly connected to the front end cover (3) and the rear end cover (4); a displacement sensor (22) is installed at the rear end of the rear end cover (4); the front end of the front end cover (3) is sealedly connected to the high-pressure cylinder (7); the rear end cover (4) is provided with an oil inlet (32); and the front end cover (3) is provided with an oil return port (33). ), the piston (6) is sealingly and slidably connected in the cylinder barrel (1), the rear end of the piston rod (5) is fixedly connected to the piston (6), the piston rod (5) and the piston (6) are coaxial, the front of the piston rod (5) passes through the front end cover (3) and is slidably connected in the high-pressure cylinder (7), the high-pressure cylinder (7) is provided with a liquid inlet and a liquid outlet, a first sealing component is provided between the piston rod (5) and the front end cover (3), and a second sealing component is provided between the cylinder barrel (1) and the piston (6).

2. The ultra-high pressure hydraulic booster cylinder according to claim 1, characterized in that: The first sealing component comprises a copper sleeve (9), a high pressure seal (16), a support sleeve (31), a step seal (18) and a shaft guide band (21) which are arranged on the inner wall of the front end cover (3) from front to back; the second sealing component comprises a grid ring (17) and a hole guide band (15) which are arranged on the outer wall of the piston (6), and the two hole guide bands (15) are respectively located on the front and rear sides of the grid ring (17).

3. The ultra-high pressure hydraulic booster cylinder according to claim 2, characterized in that: The high-pressure seal (16) comprises a sealing ring (42) and a rubber O-ring (43), wherein the rubber O-ring (43) is embedded in the front end of the sealing ring (42), a gap is provided between the front end of the sealing ring (42) and the rear end of the copper sleeve (9), the contact surface between the rear end of the sealing ring (42) and the support sleeve (31) is an inclined surface, and the inclined surface of the sealing ring (42) is inclined toward the axis of the sealing ring (42) along the direction from front to rear.

4. An ultra-high pressure hydraulic booster cylinder according to any one of claims 1 to 3, characterized in that: Flanges (2) are installed at both ends of the cylinder (1), and the flanges (2) are threadedly connected to both ends of the cylinder (1).

5. The ultra-high pressure hydraulic booster cylinder according to claim 4, characterized in that: The front end cover (3) is connected to the flange (2) at the front end of the cylinder barrel (1) via a third fastening screw (27), the rear end cover (4) is fixed to the flange (2) at the rear end of the cylinder barrel (1) via a second fastening screw (26), and the high-pressure cylinder (7) is connected to the front end cover (3) via a fourth fastening screw (28).

6. The ultra-high pressure hydraulic booster cylinder according to claim 5, characterized in that: The front end of the cylinder barrel (1) and the front end cover (3) as well as the rear end of the cylinder barrel (1) and the rear end cover (4) are sealed by a first O-ring (10) and a first retaining ring (11); the front end cover (3) and the high-pressure cylinder (7) are sealed by a second retaining ring (13), a second O-ring (12) and a fourth O-ring (14); and the piston rod (5) and the piston (6) are sealed by a third O-ring (19) and a third retaining ring (20).

7. An ultra-high pressure hydraulic booster cylinder according to any one of claims 1 to 6, characterized in that: The piston (6) is provided with a magnetic ring (23), and a magnetic isolation ring (24) is provided at the rear end of the magnetic ring (23). The magnetic ring (23) and the magnetic isolation ring (24) are connected to the end surface of the piston (6) via a first fastening screw (25). The magnetic ring (23), the piston (6) and the piston rod (5) are integrally connected to the sealing measuring rod (30) of the displacement sensor (22) in a sliding manner.

8. The ultra-high pressure hydraulic booster cylinder according to claim 7, characterized in that: The sealing measuring rod (30) of the displacement sensor (22) is sealedly connected to the rear end face of the rear end cover (4), and a sensor shield (8) is arranged outside the displacement sensor (22). The sensor shield (8) is connected to the rear end face of the rear end cover (4) via a fifth fastening screw (29).

9. The ultra-high pressure hydraulic booster cylinder according to claim 8, characterized in that: The rear end cover (4) is provided with an oil inlet chamber (34), the oil inlet port (32) is connected to the oil inlet chamber (34), the front end cover (3) is provided with an oil return chamber (36), the oil return port (33) is connected to the oil return chamber (36), the cylinder barrel (1) is provided with an oil storage chamber (35), the two sides of the oil storage chamber (35) are respectively connected to the oil inlet chamber (34) and the oil return chamber (36), and the oil inlet chamber (34) and the oil return chamber (36) are coaxial with the piston (6) and the piston rod (5).

10. An ultra-high pressure hydraulic booster cylinder according to any one of claims 1 to 9, characterized in that: The piston rod (5) and the high-pressure cylinder (7) are made of titanium alloy TC4, and the diameter ratio of the piston (6) and the piston rod (5) is 100:22.

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