Ultrasonic detection position with emergency shut-off valve block and cylinder integrated EHA

Abstract

The application discloses an EHA (Electro-Hydraulic Actuator) with an emergency shutdown valve block integrated with an oil cylinder, which realizes the function of ultrasonic detection of position through cooperation of a scale protection cover, a guide rod, an ultrasonic reflection plate, an ultrasonic displacement sensor and a piston rod; realizes the function of emergency shutdown through cooperation of an electromagnetic valve, the piston rod, a multifunctional lower end cover, a disc spring, a disc spring pressing plate, a connecting flange and a connecting guide rod; realizes modular integration through cooperation of a multifunctional upper end cover, a multifunctional valve block, the piston rod and the multifunctional lower end cover; and realizes safe and stable operation of the EHA in combination with a pressure sensor, a pressure measuring connector, a safety overflow valve, an oil outlet hydraulic control check valve, an oil suction hydraulic control check valve, a closed oil tank, a bidirectional high-efficiency gear pump, a shaft coupling and a servo motor. The application can realize emergency shutdown under special conditions such as earthquakes, fires and power failures, adopts modular design, has compact structure, no external pipeline and high reliability, and can meet installation in various environments and cope with various working conditions.

Description

Technical Field

[0001] This invention relates to the field of EHA technology, and more particularly to an EHA with an integrated valve block and hydraulic cylinder for ultrasonic position detection and emergency shut-off. Background Technology

[0002] EHA (Electro-Hydrohydrodynamic) originated in the early 20th century with hydrostatic transmission devices, later known in the international aerospace industry as Direct Drive Volume Control. This technology has developed rapidly in recent years and is now commonly referred to as an Electric Hydraulic Actuator (EHA) in the international aerospace industry. In the context of the pursuit of energy efficiency and high performance, and due to the significant development and progress of servo control technology, EHA technology has gradually expanded from the aerospace field to general industrial and civilian applications. Due to its unique advantages of high efficiency, low energy consumption, high precision, and high reliability, EHA is particularly suitable for industries such as metal smelting, petrochemicals, gas transmission, and thermal power generation. However, many problems exist with current EHA systems on the market, limiting their application scope.

[0003] Currently, most EHAs on the market use either LVDT linear displacement sensors or magnetostrictive displacement sensors. Both types of sensors have certain problems during use. LVDT linear displacement sensors have a relatively simple installation method, often requiring an external, bulky bracket, which significantly increases the size and weight of the EHA and greatly limits its application scenarios. While magnetostrictive displacement sensors can indeed be made internally, this significantly reduces the strength of the hydraulic cylinder, thereby decreasing the reliability of the EHA.

[0004] Most EHAs on the market currently lack emergency shutdown functionality. Even those that do use manual pumps for emergency shutdown. EHAs without this feature cannot shut down in emergencies such as earthquakes, fires, or power outages, potentially leading to accidents, unnecessary economic losses, and personal injury. EHAs using manual pumps for emergency shutdown are slow to shut down and require manual intervention in emergencies, failing to meet the needs of emergency shutdown during such events. Therefore, there is an urgent market demand for EHAs with an emergency shutdown function.

[0005] Most EHA systems on the market currently consist of several parts, including a motor pump unit, valve block, hydraulic cylinder, and piping. The piping section typically occupies a significant amount of space, is easily damaged by impact, and is prone to oil leaks. Traditional EHA valve blocks and hydraulic cylinders often occupy considerable space, and the piping connecting the valve block and cylinder is also prone to leaks. This complexity significantly increases the difficulty of use and maintenance.

[0006] In summary, the shortcomings of existing EHA technology include: LVDT linear displacement sensors have a single installation method, requiring large external brackets, which limits the application scenarios of EHA; built-in magnetostrictive displacement sensors reduce the strength of the hydraulic cylinder and reduce the reliability of EHA; existing EHAs do not have a fully automatic emergency shutdown function; and existing EHA valve blocks and hydraulic cylinders are large in size, making the connecting pipelines prone to damage. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention proposes an EHA (Emergency Hydraulic Actuator) with an integrated valve block and hydraulic cylinder for ultrasonic position detection. This EHA technology is characterized by simple installation, convenient operation, flexible control, high output force, high reliability, energy efficiency, and high integration.

[0008] The specific technical solution is as follows:

[0009] An EHA (Emergency Hydraulic Actuator) with an integrated valve block and cylinder for ultrasonic position detection includes: an ultrasonic displacement sensor, a solenoid valve, a pressure sensor, a pressure testing connector, a safety relief valve, an oil outlet hydraulic control check valve, an oil suction hydraulic control check valve, a closed oil tank, a bidirectional high-efficiency gear pump, a coupling, a servo motor, and an integrated valve block and cylinder actuator; the servo motor controls the rotation of the bidirectional high-efficiency gear pump through the coupling, and the bidirectional high-efficiency gear pump is connected to the closed oil tank through the oil suction hydraulic control check valve;

[0010] The integrated valve block and cylinder actuator includes: a protective cover with a scale, an ultrasonic reflector, a guide rod, an ultrasonic displacement sensor mounting block, a multi-functional upper end cover, a multi-functional valve block, a piston rod, a multi-functional lower end cover, a disc spring, a disc spring pressure plate, a connecting flange, a mounting flange, and a connecting guide rod. The multi-functional upper end cover is fixedly connected to the upper end of the through hole of the multi-functional valve block, and the multi-functional lower end cover is fixedly connected to the lower end of the through hole of the multi-functional valve block. The piston rod is installed in the through hole of the multi-functional valve block and passes through the multi-functional upper end cover and the multi-functional lower end cover respectively. The sealed cavity formed between the piston rod, the multi-functional valve block, and the multi-functional upper end cover is the upper cavity of the integrated valve block and cylinder actuator, and the sealed cavity formed between the piston rod, the multi-functional valve block, and the multi-functional lower end cover is the lower cavity of the integrated valve block and cylinder actuator.

[0011] The pressure sensor, pressure testing connector, and safety relief valve are respectively connected to the upper and lower chambers to monitor the system's operating status and ensure safe system operation. The bidirectional high-efficiency gear pump is connected to the upper and lower chambers via the oil outlet hydraulic control check valve. One solenoid valve is connected to both the upper chamber and the closed oil tank, and another solenoid valve is connected to both the lower chamber and the closed oil tank. When the solenoid valve is energized, the upper and lower chambers are not connected; when the solenoid valve is de-energized, the upper and lower chambers are connected.

[0012] The ultrasonic reflector is fixed to the upper end of the piston rod, and the guide rod is fixed to the upper end cover of the multi-functional valve and passes through the ultrasonic reflector, allowing the ultrasonic reflector to move axially along the guide rod. The ultrasonic displacement sensor mounting block is fixed to the side of the multi-functional valve block, and the ultrasonic displacement sensor is mounted on the ultrasonic displacement sensor mounting block. The scale-coated protective cover is fixed to the upper end cover of the multi-functional valve and the ultrasonic displacement sensor mounting block, and has an observation window on its exterior. The observation window has a scale on one side, and the ultrasonic reflector has an indicator mark on the side near the observation window. One end of the connecting guide rod is fixed to the lower end cover of the multi-functional valve and the other end is fixed to the mounting flange. The connecting flange is fixed to the disc spring pressure plate and to the lower end of the piston rod. The disc spring pressure plate is sleeved on the connecting guide rod and can move axially. The disc spring is sleeved on the lower part of the piston rod, with the upper end of the disc spring tightly against the lower end cover of the multi-functional valve and the lower end tightly against the disc spring pressure plate.

[0013] Furthermore, the multifunctional upper end cover and the multifunctional valve block, and the multifunctional lower end cover and the multifunctional valve block are sealed by O-rings; dustproof rings, step seals, and guide belts are provided between the piston rod and the multifunctional upper end cover and the multifunctional lower end cover, with the dustproof rings and step seals located on the outer side; a Glyd ring and a guide belt are provided between the piston rod and the multifunctional valve block; and guide belts are provided between the ultrasonic reflector and the guide rod, and between the connecting guide rod and the disc spring pressure plate.

[0014] Furthermore, the pressure sensor and pressure testing connector detect the pressure of the hydraulic oil in the upper and lower chambers. If the pressure exceeds the pressure set by the safety relief valve, the hydraulic oil in the corresponding chamber flows back to the closed oil tank through the safety relief valve.

[0015] Furthermore, the ultrasonic displacement sensor adopts a direct reflection detection mode. The ultrasonic reflector reflects the ultrasonic signal emitted by the ultrasonic displacement sensor, which is then received by the ultrasonic displacement sensor to achieve ultrasonic position detection. At the same time, the ultrasonic displacement sensor detects and feeds back the position signal to the servo motor, thereby controlling the start and stop of the servo motor.

[0016] Furthermore, the disc spring is provided with an outer ring positioning steel wire and an inner ring positioning steel wire to restrict the disc spring's radial inward and radial outward movement.

[0017] Furthermore, the disc spring is made of special alloy steel and is treated with special heat treatment and surface treatment processes to give it both mechanical properties and corrosion resistance.

[0018] Furthermore, the piston rod is made of ordinary alloy steel bar, and its upper and lower rod surfaces are quenched and hard chrome plated, while the middle piston part is processed after heat treatment.

[0019] The beneficial effects of this invention are:

[0020] (1) This invention achieves the function of ultrasonic position detection through the combination of a scale-protected cover, a guide rod, an ultrasonic reflector, an ultrasonic displacement sensor, and a piston rod; the scale on the scale-protected cover and the indicator marks on the ultrasonic reflector can be used to directly read the specific position of the piston rod visually, which is convenient for installation, debugging and subsequent maintenance; the selected ultrasonic displacement sensor has a simple structure, small size, high sensitivity and good accuracy, and flexible installation method, which is convenient for installation, disassembly, debugging and maintenance.

[0021] (2) The present invention achieves emergency shutdown function in special circumstances such as earthquake, fire, and power outage through electromagnetic valve, piston rod, disc spring, and disc spring pressure plate; and the disc spring structure is simple and compact, which can be more convenient and flexible while meeting the emergency shutdown function.

[0022] (3) The valve block and cylinder integrated actuator of the present invention adopts a modular design, which makes the structure more compact, has no exposed pipelines, has high reliability, can be installed in a variety of environments, can cope with a variety of working conditions, and can stop at any position as required.

[0023] (4) The present invention can replace different models and sizes of components according to actual usage needs to meet various operating conditions. It is an EHA technology that is simple to install, easy to operate, flexible to control, has a large output force, high reliability, energy efficiency and high integration. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the hydraulic principle of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the present invention.

[0026] Figure 3 This is a front view of the structure of the present invention.

[0027] Figure 4 This is a right view of the structure of the present invention.

[0028] Figure 5 This is a front sectional view of the integrated valve block and cylinder actuator of the present invention.

[0029] In the diagram, the components are: ultrasonic displacement sensor 1, solenoid valve 1 2-1, solenoid valve 2 2-2, pressure sensor 1 3-1, pressure sensor 2 3-2, pressure test connector 1 4-1, pressure test connector 2 4-2, safety relief valve 1 5-1, safety relief valve 2 5-2, oil outlet hydraulic control check valve 1 6-1, oil outlet hydraulic control check valve 2 6-2, oil suction hydraulic control check valve 1 7-1, oil suction hydraulic control check valve 2 7-2, closed oil tank 8, bidirectional high-efficiency gear pump 9, coupling 10, servo motor 11, valve block and cylinder integrated actuator 12, protective cover with scale 12-1, guide rod 12-2, guide belt 1 12-3, screw 1 12-4, circular pressure ring 12-5, ultrasonic reflector 12-6, screw... 12-7 Nail 2, 12-8 Screw 3, 12-9 Multifunctional upper end cap, 12-10 Multifunctional valve block, 12-11 Piston rod, 12-12 Glyd ring, 12-13 Guide band 2, 12-14 Multifunctional lower end cap, 12-15 Disc spring outer ring positioning wire, 12-16 Disc spring, 12-17 Disc spring inner ring positioning wire, 12-18 Disc spring pressure plate, 12-19 Connecting flange, 12-20 Mounting flange, 12-21 Screw 4, 12-22 Connecting guide rod, 12-23 Guide band 3, 12-24 Dustproof ring, 12-25 Step seal, 12-26 Guide band 4, 12-27 O-ring seal, 12-28 Plug, 12-29 Ultrasonic displacement sensor mounting block. Detailed Implementation

[0030] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The objectives and effects of the present invention will become clearer as a result. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0031] like Figure 1 As shown, an EHA with an integrated valve block and cylinder for ultrasonic position detection includes: an ultrasonic displacement sensor 1, a solenoid valve 2-1, a solenoid valve 2-2, a pressure sensor 3-1, a pressure sensor 3-2, a pressure testing connector 4-1, a pressure testing connector 4-2, a safety relief valve 5-1, a safety relief valve 5-2, an oil outlet hydraulic control check valve 6-1, an oil outlet hydraulic control check valve 6-2, an oil suction hydraulic control check valve 7-1, an oil suction hydraulic control check valve 7-2, a closed oil tank 8, a bidirectional high-efficiency gear pump 9, a coupling 10, a servo motor 11, and an integrated valve block and cylinder actuator 12.

[0032] like Figure 2 , Figure 3 and Figure 4 As shown, a servo motor 11 is fixedly connected to the upper end of the coupling 10, and a closed oil tank 8 and a bidirectional high-efficiency gear pump 9 are fixedly connected to the other end. The closed oil tank 8 is fixedly connected to and sealed outside the bidirectional high-efficiency gear pump 9. The bidirectional high-efficiency gear pump 9 is connected to the closed oil tank 8 through a suction hydraulic control check valve 7-1 and a suction hydraulic control check valve 7-2. The servo motor 11 controls the rotation of the bidirectional high-efficiency gear pump 9 through the coupling 10. The right side of the coupling 10 is fixedly connected to the valve block and cylinder integrated actuator 12.

[0033] like Figure 5 As shown, the integrated valve block and cylinder actuator 12 includes: a protective cover with a scale 12-1, a guide rod 12-2, a guide belt 12-3, a screw 12-4, a circular pressure ring 12-5, an ultrasonic reflector 12-6, a screw 2 12-7, a screw 3 12-8, a multi-functional upper end cover 12-9, a multi-functional valve block 12-10, a piston rod 12-11, a Gladley ring 12-12, a guide belt 2 12-13, a multi-functional lower end cover 12-14, and a disc spring. Outer ring positioning steel wire 12-15, disc spring 12-16, inner ring positioning steel wire of disc spring 12-17, disc spring pressure plate 12-18, connecting flange 12-19, mounting flange 12-20, four screws 12-21, connecting guide rod 12-22, three guide strips 12-23, dustproof ring 12-24, step seal 12-25, four guide strips 12-26, O-ring seal 12-27, plug 12-28, ultrasonic displacement sensor mounting block 12-29.

[0034] The multi-functional valve block 12-10 has a stepped through-hole inside, divided into three cylindrical through-holes of different diameters from top to bottom: cylindrical through-hole one, cylindrical through-hole two, and cylindrical through-hole three. The diameter of cylindrical through-hole two is smaller than that of cylindrical through-hole one and cylindrical through-hole three. The piston rod 12-11 is installed in the stepped through-hole of the multi-functional valve block 12-10. The piston rod 12-11 consists of three parts: upper and lower rod parts and a middle piston part. The diameter of the middle piston part is larger than that of the upper and lower rod parts. The multi-functional upper end cap 12-9 is fixed to one of the cylindrical through-holes of the multi-functional valve block 12-10 by screw three 12-8 and sealed with an O-ring seal 12-27. The multi-functional upper end cap 12-9 has a through-hole through which the upper rod part of the piston rod 12-11 passes. The multi-functional lower end cap 12-14 is fixed to the three cylindrical through holes of the multi-functional valve block 12-10 by screws 12-8 and sealed with O-rings 12-27. A through hole is provided on the multi-functional lower end cap 12-14, through which the lower rod of the piston rod 12-11 passes. The cavity formed between the upper rod and the middle piston portion of the piston rod 12-11, the multi-functional valve block 12-10, and the multi-functional upper end cap 12-9 constitutes the upper cavity of the valve block and cylinder integrated actuator 12. The cavity formed between the lower rod and the middle piston portion of the piston rod 12-11, the multi-functional valve block 12-10, and the multi-functional lower end cap 12-14 constitutes the lower cavity of the valve block and cylinder integrated actuator 12. In this embodiment, the piston rod 12-11 is made of ordinary alloy steel bar, with its upper and lower rod surfaces hardened and hard chrome plated. The middle piston portion of the piston rod 12-11 is machined after heat treatment.

[0035] A Glyd ring 12-12 and a guide belt 12-13 are provided on the middle piston part of the piston rod 12-11. The Glyd ring 12-12 cooperates with the stepped through hole of the multi-functional valve block 12-10 to isolate the upper and lower chambers of the valve block and the integrated hydraulic cylinder actuator 12, so that the oil in the upper and lower chambers does not leak. The guide belt 12-13 is made of polytetrafluoroethylene and copper powder composite, which can avoid direct contact between the piston rod 12-11 and the multi-functional valve block 12-10, and protect other sealing rings to a certain extent. At the same time, it can guide, absorb lateral loads, improve load-bearing capacity, and suppress mechanical vibration. The O-ring 12-27 prevents the oil inside the upper chamber from leaking out while also preventing external gas or dust from entering the multi-functional valve block 12-10. The inner wall of the through hole of the multi-functional upper end cover 12-9 is provided with a dustproof ring 12-24, a step seal 12-25, and a guide band 12-26 from top to bottom. The inner wall of the through hole of the multi-functional lower end cover 12-14 is provided with a guide band 12-26, a step seal 12-25, and a dustproof ring 12-24 from top to bottom. The dustproof ring 12-24 and the step seal 12-25 are used to seal the oil in the upper or lower chamber, while preventing external gas or dust from entering the upper or lower chamber. The material and function of the guide band 12-26 are the same as those of the guide band 12-13.

[0036] Pressure sensor 3-2 and pressure testing connector 4-2 are respectively connected to the upper chamber of the integrated valve block and cylinder actuator 12 to detect the pressure in the upper chamber; pressure sensor 3-1 and pressure testing connector 4-1 are respectively connected to the lower chamber of the integrated valve block and cylinder actuator 12 to detect the pressure in the lower chamber, thereby detecting the operating status of the integrated valve block and cylinder actuator 12. Safety relief valve 5-1 and safety relief valve 5-2 are respectively fixed to the multi-functional valve block 12-10, wherein safety relief valve 5-1 is connected to the lower chamber and safety relief valve 5-2 is connected to the upper chamber. When the pressure of the hydraulic oil in the upper or lower chamber exceeds the pressure set by safety relief valve 5-1 and safety relief valve 5-2, the hydraulic oil flows back to the closed oil tank 8 through safety relief valve 5-1 and safety relief valve 5-2 to ensure the safe operation of the system. The bidirectional high-efficiency gear pump 9 is connected to the lower chamber of the integrated valve block and cylinder actuator 12 via the oil outlet hydraulic control check valve 6-1, and to the upper chamber of the integrated valve block and cylinder actuator 12 via the oil outlet hydraulic control check valve 6-2. Solenoid valves 2-1 and 2-2 are fixed to the multi-functional valve block 12-10. Solenoid valve 2-1 is connected to the lower chamber of the integrated valve block and cylinder actuator 12 and the closed oil tank 8, respectively. Solenoid valve 2-2 is connected to the upper chamber of the integrated valve block and cylinder actuator 12 and the closed oil tank 8, respectively. When solenoid valves 2-1 and 2-2 are energized, the upper chamber, lower chamber, and closed oil tank are not connected; when solenoid valves 2-1 and 2-2 are de-energized, the upper chamber, lower chamber, and closed oil tank are connected. The plug 12-28 is used to seal the process holes on the multi-functional valve block 12-10, serving a sealing and process simplification function.

[0037] The ultrasonic reflector 12-6 is fixed to the upper end of the piston rod 12-11 by screw 12-4 and circular pressure ring 12-5. A guide rod 12-2 is fixed to the multi-functional upper end cover 12-9. The guide rod 12-2 passes through the ultrasonic reflector 12-6. A guide band 12-3 is provided in the through hole where the ultrasonic reflector 12-6 contacts the guide rod 12-2. It plays a guiding role when the ultrasonic reflector 12-6 moves with the piston rod 12-11, so that the movement of the ultrasonic reflector 12-6 is more stable and precise. The ultrasonic displacement sensor mounting block 12-29 is fixed to the upper side of the multi-functional valve block 12-10. The ultrasonic displacement sensor 1 is mounted on the ultrasonic displacement sensor mounting block 12-29 by a screw insertion method. This installation method is flexible and can meet various needs. The ultrasonic displacement sensor 1 adopts a direct reflection detection mode. The ultrasonic reflector 12-6 reflects the ultrasonic signal emitted by the ultrasonic displacement sensor 1, which is received by the ultrasonic displacement sensor 1, thereby realizing the ultrasonic position detection function. At the same time, the ultrasonic displacement sensor 1 detects and feeds back the position signal to the servo motor 11, thereby controlling the start and stop of the servo motor 11. The scale protective cover 12-1 is fixed to the multi-functional upper cover 12-9 and the ultrasonic displacement sensor mounting block 12-29 by screws 12-7. The scale protective cover 12-1 is made of stainless steel and has an observation window on the outside. The observation window is laser-engraved with scale on one side. The scale protective cover 12-1 can not only effectively protect the ultrasonic displacement sensor 1 and ultrasonic reflector 12-6 and other components, but also effectively shield external interference, increasing measurement accuracy and reliability. The ultrasonic reflector 12-6 has laser-engraved scale markings on the side near the observation window. This allows the ultrasonic reflector 12-6 to reflect the ultrasonic signal emitted by the ultrasonic displacement sensor 1 as it moves up and down with the piston rod 12-11, and also enables direct visual reading of the piston rod 12-11's position, facilitating installation, debugging, and subsequent maintenance. In this embodiment, the ultrasonic reflector 12-6 is made of aluminum alloy, while the guide rod 12-2 and the circular pressure ring 12-5 are made of ordinary alloy steel. The guide rod 12-2 is surface-hardened and hard chrome-plated. The ultrasonic displacement sensor 1 is manufactured using state-of-the-art sensor production technology, possessing a high level of protection and anti-interference capability, while also providing precise error compensation, achieving a measurement accuracy of 0.1mm. In summary, this invention, through the combined use of the scale-protected cover 12-1, guide rod 12-2, ultrasonic reflector 12-6, ultrasonic displacement sensor 1, and piston rod 12-11, achieves the function of ultrasonic position detection.

[0038] One end of the connecting guide rod 12-22 is fixed to the multi-functional lower end cover 12-14 by screw 12-21, and the other end is fixed to the mounting flange 12-20 by screw 12-21. The three connecting guide rods 12-22 are distributed at equal angles and intervals around the center of the multi-functional lower end cover 12-14. The connecting flange 12-19 is fixed to the lower end of the piston rod 12-11 by threads, and the connecting flange 12-19 is fixed to the disc spring pressure plate 12-18. The disc spring pressure plate 12-18 is sleeved on the connecting guide rod 12-22, and a guide band 12-23 is provided inside the disc spring pressure plate 12-18. Disc spring 12-16 is fitted onto the lower part of piston rod 12-11. Its upper end is in close contact with multi-functional lower end cover 12-14, and its lower end is in close contact with disc spring pressure plate 12-18. Multi-functional lower end cover 12-14 functions as a disc spring base, which fixes disc spring 12-16 and applies downward force. The disc spring 12-16 is equipped with an outer ring positioning wire 12-15 and an inner ring positioning wire 12-17. The inner ring positioning wire 12-17 restricts the radial inward and radial outward movement of the disc spring 12-16. The piston rod 12-11 can also restrict the radial inward and radial outward movement of the disc spring 12-16 to a certain extent, thus providing a double safety function. The outer ring positioning wire 12-15 restricts the radial outward and radial inward movement of the disc spring 12-16. The connecting guide rod 12-22 can also restrict the radial outward and radial inward movement of the disc spring 12-16 to a certain extent, thus providing a double safety function. The connecting flange 12-19 tightly presses the disc spring 12-16 against the disc spring pressure plate 12-18, giving the disc spring 12-16 a certain amount of pre-compression. When the connecting flange 12-19 moves axially up and down together with the piston rod 12-11, it drives the disc spring pressure plate 12-18 to move axially up and down together. In this embodiment, the multi-functional lower end cover 12-14, the outer ring positioning steel wire 12-15 of the disc spring, the inner ring positioning steel wire 12-17 of the disc spring, the disc spring pressure plate 12-18, the connecting flange 12-19, the mounting flange 12-20, and the connecting guide rod 12-22 are all made of ordinary alloy steel. The connecting guide rod 12-22 is surface hardened and hard chrome plated. The disc spring 12-16 is made of special alloy steel and is treated with special heat treatment and surface treatment processes, giving it not only excellent mechanical properties but also excellent corrosion resistance.

[0039] In summary, based on the geometric axiom that "there is one and only one plane through three points that are not on the same straight line," this invention innovatively uses components such as solenoid valve 12-16, solenoid valve 2-2, piston rod 12-11, multi-functional lower end cover 12-14, disc spring outer ring positioning wire 12-15, disc spring inner ring positioning wire 12-17, disc spring pressure plate 12-18, connecting flange 12-19, mounting flange 12-20, connecting guide rod 12-22, and guide belt 3 to form a mechanical structure in which the disc spring 12-16 can move vertically up and down and can only exert force vertically downwards. In special circumstances, solenoid valve 2-1 and solenoid valve 2-2 lose power, causing the valve block to connect with the upper and lower chambers of the integrated hydraulic cylinder actuator 12 and the closed oil tank 8. As a result, the oil in the upper and lower chambers of the integrated hydraulic cylinder actuator 12 loses pressure, thereby completing the emergency shut-off function under the action of the vertical downward spring force of disc spring 12-16.

[0040] The multi-functional upper end cap 12-9 not only functions as the upper end cap of a standard hydraulic cylinder, but also serves to install and secure components such as the graduated protective cover 12-1 and guide rod 12-2, while also functioning as a guide sleeve for a standard hydraulic cylinder. The multi-functional lower end cap 12-14 not only functions as the lower end cap of a standard hydraulic cylinder, but also serves to install and secure components such as the disc spring 12-16 and connecting guide rod 12-22, while also functioning as a guide sleeve for a standard hydraulic cylinder. The functional valve block 12-10 is made of special alloy steel, and its contact area with the piston rod 12-11 undergoes special heat treatment and surface treatment processes to achieve high hardness. Therefore, the multi-functional valve block 12-10 functions not only as a standard valve block but also as a cylinder barrel for a standard hydraulic cylinder. In summary, the present invention, through the innovative design and combination of components such as the multifunctional upper end cover 12-9, the multifunctional valve block 12-10, and the multifunctional lower end cover 12-14, enables a single component to perform multiple functions, thus realizing the function of integrated valve block and hydraulic cylinder actuation, thereby making the integrated valve block and hydraulic cylinder actuator 12 more compact and reliable.

[0041] This invention can be used in various environments and working conditions. Through the cooperation of all components, it realizes the electro-hydraulic servo control function for ultrasonic detection position, and also has an emergency shutdown function in special circumstances. The specific operation under different working conditions is as follows (for ease of description, this invention will be referred to as EHA below):

[0042] (1) Initial state of EHA: such as Figure 5As shown, at this time, the servo motor 11 is in a stopped state, and the piston rod 12-11 is in a fully extended state, that is, the piston rod 12-11 is located at the lowest point of the movable area; the closed oil tank 8 is filled with hydraulic oil, the solenoid valve 2-1 and the solenoid valve 2-2 are de-energized, and the ultrasonic displacement sensor 1 detects that the piston rod 12-11 is in a fully extended state. At this time, EHA is in the initial state. During the initial and subsequent operation of EHA, the pressure of the hydraulic oil in the lower chamber of the valve block and cylinder integrated actuator 12 is constantly monitored by the pressure sensor 3-1 and the pressure test connector 4-1, and the pressure of the hydraulic oil in the upper chamber of the valve block and cylinder integrated actuator 12 is constantly monitored by the pressure sensor 3-2 and the pressure test connector 4-2. If the pressure exceeds the pressure set by the safety relief valve 5-1 and the safety relief valve 5-2, the hydraulic oil in the corresponding chamber flows back to the closed oil tank 8 through the safety relief valve 5-1 and the safety relief valve 5-2, thereby better controlling and protecting EHA.

[0043] (2) EHA piston rod retracts to any position and remains in this state: At this time, solenoid valve 1 2-1 and solenoid valve 2-2 are energized. Servo motor 11 receives the control signal to retract to any position and drives bidirectional high-efficiency gear pump 9 to rotate in the forward direction through coupling 10. Bidirectional high-efficiency gear pump 9 draws in hydraulic oil from the upper chamber of valve block and cylinder integrated actuator 12 through oil outlet hydraulic control check valve 6-2. If necessary, hydraulic oil can also be replenished from the closed oil tank 8 through oil suction hydraulic control check valve 2 7-2. After that, bidirectional high-efficiency gear pump 9 delivers hydraulic oil to the lower chamber of valve block and cylinder integrated actuator 12 through oil outlet hydraulic control check valve 1 6-1. At this time, piston rod 12-11 will retract. When the piston rod 12-11 reaches the designated position, the ultrasonic displacement sensor 1 feeds back the position signal of the piston rod 12-11. At this time, the servo motor 11 will stop rotating, and the valve block and cylinder integrated actuator 12 will remain in the designated position under the combined action of the oil outlet hydraulic control check valve 6-1 and the oil outlet hydraulic control check valve 6-2.

[0044] (3) EHA piston rod extends to any position and remains in the state: At this time, solenoid valve 1 2-1 and solenoid valve 2-2 are energized. Servo motor 11 receives the control signal to extend to any position and drives bidirectional high-efficiency gear pump 9 to rotate in the opposite direction through coupling 10. Bidirectional high-efficiency gear pump 9 draws in the hydraulic oil in the lower chamber of valve block and cylinder integrated actuator 12 through oil outlet hydraulic control check valve 6-1. If necessary, hydraulic oil can also be replenished from the closed oil tank 8 through oil suction hydraulic control check valve 1 7-1. After that, bidirectional high-efficiency gear pump 9 delivers hydraulic oil to the upper chamber of valve block and cylinder integrated actuator 12 through oil outlet hydraulic control check valve 2 6-2. At this time, piston rod 12-11 will extend. When the piston rod 12-11 reaches the designated position, the ultrasonic displacement sensor 1 feeds back the position signal of the piston rod 12-11. At this time, the servo motor 11 will stop rotating, and the valve block and cylinder integrated actuator 12 will remain in the designated position under the combined action of the oil outlet hydraulic control check valve 6-1 and the oil outlet hydraulic control check valve 6-2.

[0045] (4) Emergency shut-off of EHA piston rod to the fully closed position and maintenance: At this time, the servo motor 11 is stopped, solenoid valve 2-1 and solenoid valve 2-2 are de-energized, and the upper and lower chambers of the valve block and the integrated hydraulic cylinder actuator 12 and the closed oil tank 8 are interconnected. Thus, the oil in the upper and lower chambers of the valve block and the integrated hydraulic cylinder actuator 12 loses pressure. Under the action of the vertical downward spring force of the disc spring 12-16, the piston rod 12-11 is fully extended. At the same time, the ultrasonic displacement sensor 1 detects that the piston rod 12-11 is fully extended, thereby completing the emergency shut-off to the fully closed position. As long as the servo motor 11 is stopped and solenoid valve 2-1 and solenoid valve 2-2 are de-energized thereafter, the valve block and the integrated hydraulic cylinder actuator 12 will always be in the fully closed position and maintenance state. At this time, EHA is in the initial state.

[0046] This invention is mainly used in industries such as metal smelting, petrochemicals, gas transmission, and thermal power generation. It is an EHA technology that is simple to install, easy to operate, flexible to control, has a large output force, high reliability, energy efficiency, and high integration. It has an emergency shutdown function in special circumstances such as earthquakes, fires, and power outages, and can well meet the market demand and the high requirements of the new era for EHA such as high safety, high reliability, high integration, and high cost performance.

[0047] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. An EHA with an integrated valve block and hydraulic cylinder for ultrasonic position detection, characterized in that, include: The system includes an ultrasonic displacement sensor, a solenoid valve, a pressure sensor, a pressure testing connector, a safety relief valve, an oil outlet hydraulic control check valve, an oil suction hydraulic control check valve, a closed oil tank, a bidirectional high-efficiency gear pump, a coupling, a servo motor, and a valve block and cylinder integrated actuator. The servo motor controls the rotation of the bidirectional high-efficiency gear pump through the coupling, and the bidirectional high-efficiency gear pump is connected to the closed oil tank through the oil suction hydraulic control check valve. The integrated valve block and cylinder actuator includes: a protective cover with a scale, an ultrasonic reflector, a guide rod, an ultrasonic displacement sensor mounting block, a multi-functional upper end cover, a multi-functional valve block, a piston rod, a multi-functional lower end cover, a disc spring, a disc spring pressure plate, a connecting flange, a mounting flange, and a connecting guide rod. The multi-functional upper end cover is fixedly connected to the upper end of the through hole of the multi-functional valve block, and the multi-functional lower end cover is fixedly connected to the lower end of the through hole of the multi-functional valve block. The piston rod is installed in the through hole of the multi-functional valve block and passes through the multi-functional upper end cover and the multi-functional lower end cover respectively. The sealed cavity formed between the piston rod, the multi-functional valve block, and the multi-functional upper end cover is the upper cavity of the integrated valve block and cylinder actuator, and the sealed cavity formed between the piston rod, the multi-functional valve block, and the multi-functional lower end cover is the lower cavity of the integrated valve block and cylinder actuator. The pressure sensor, pressure testing connector, and safety relief valve are respectively connected to the upper and lower chambers to monitor the system's operating status and ensure safe system operation. The bidirectional high-efficiency gear pump is connected to the upper and lower chambers via the oil outlet hydraulic control check valve. One solenoid valve is connected to both the upper chamber and the closed oil tank, and another solenoid valve is connected to both the lower chamber and the closed oil tank. When the solenoid valve is energized, the upper and lower chambers are not connected; when the solenoid valve is de-energized, the upper and lower chambers are connected. The ultrasonic reflector is fixed to the upper end of the piston rod, and the guide rod is fixed to the upper end cover of the multi-functional valve and passes through the ultrasonic reflector, allowing the ultrasonic reflector to move axially along the guide rod. The ultrasonic displacement sensor mounting block is fixed to the side of the multi-functional valve block, and the ultrasonic displacement sensor is mounted on the ultrasonic displacement sensor mounting block. The scale-coated protective cover is fixed to the upper end cover of the multi-functional valve and the ultrasonic displacement sensor mounting block, and has an observation window on its exterior. The observation window has a scale on one side, and the ultrasonic reflector has an indicator mark on the side near the observation window. One end of the connecting guide rod is fixed to the lower end cover of the multi-functional valve and the other end is fixed to the mounting flange. The connecting flange is fixed to the disc spring pressure plate and to the lower end of the piston rod. The disc spring pressure plate is sleeved on the connecting guide rod and can move axially. The disc spring is sleeved on the lower part of the piston rod, with the upper end of the disc spring tightly against the lower end cover of the multi-functional valve and the lower end tightly against the disc spring pressure plate. The ultrasonic displacement sensor adopts a direct reflection detection mode. The ultrasonic reflector reflects the ultrasonic signal emitted by the ultrasonic displacement sensor and is received by the ultrasonic displacement sensor to realize ultrasonic position detection. At the same time, the ultrasonic displacement sensor detects and feeds back the position signal to the servo motor, thereby controlling the start and stop of the servo motor.

2. The EHA with integrated valve block and hydraulic cylinder for ultrasonic detection position as described in claim 1, characterized in that, The multifunctional upper end cover and the multifunctional valve block, and the multifunctional lower end cover and the multifunctional valve block are sealed by O-rings; a dustproof ring, a step seal, and a guide belt are provided between the piston rod and the multifunctional upper end cover and the multifunctional lower end cover, with the dustproof ring and step seal located on the outer side; a Glyd ring and a guide belt are provided between the piston rod and the multifunctional valve block; and guide belts are provided between the ultrasonic reflector and the guide rod, and between the connecting guide rod and the disc spring pressure plate.

3. The EHA with integrated valve block and hydraulic cylinder for ultrasonic position detection according to claim 1, characterized in that, The pressure sensor and pressure testing connector detect the pressure of the hydraulic oil in the upper and lower chambers. If the pressure exceeds the pressure set by the safety relief valve, the hydraulic oil in the corresponding chamber flows back to the closed oil tank through the safety relief valve.

4. The EHA with integrated valve block and hydraulic cylinder for ultrasonic position detection according to claim 1, characterized in that, The disc spring is provided with an outer ring positioning steel wire and an inner ring positioning steel wire to restrict the disc spring's radial inward and radial outward movement.

5. The EHA with integrated valve block and hydraulic cylinder for ultrasonic detection position as described in claim 1, characterized in that, The disc spring is made of special alloy steel and is treated with special heat treatment and surface treatment processes to give it both mechanical properties and corrosion resistance.

6. The EHA with integrated valve block and hydraulic cylinder for ultrasonic position detection according to claim 1, characterized in that, The piston rod is made of ordinary alloy steel bar material, and its upper and lower rod parts are quenched and hard chrome plated. The middle piston part is processed after heat treatment.

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