Gas-liquid buffer

Abstract

The present invention belongs to the technical field of coupler buffers, and in particular relates to a gas-liquid buffer; the gas-liquid buffer comprises a cylinder body, a plunger assembly, and a throttling member; a measuring assembly is axially connected to the outer peripheral side of the closed end of the cylinder body, the measuring assembly comprises a measuring tube, a first accommodating chamber is formed inside the measuring tube, a displacement sensor capable of measuring the displacement of the gas-liquid buffer, and a pressure sensor capable of measuring the oil pressure in the first liquid chamber are provided in the first accommodating chamber; when the gas-liquid buffer is pressurized, the plunger assembly moves toward the closed end, the volume of the first liquid chamber decreases, the oil in the first liquid chamber enters the second liquid chamber, the pressure sensor monitors the pressure of the oil in the first liquid chamber in real time, and the displacement sensor monitors the displacement of the plunger assembly during the compression process in real time; whether the gas-liquid buffer has a fault can be judged without disassembling the gas-liquid buffer.

Description

Technical Field

[0001] The invention belongs to the technical field of coupler buffering, and in particular relates to a gas-liquid buffer. Background Art

[0002] The coupler buffer device is a vehicle component used to connect vehicles, locomotives or EMUs to each other, transmit traction, braking force and mitigate longitudinal impact force.

[0003] Coupler buffers are used to mitigate longitudinal shock and vibration caused by changes in locomotive traction during train operation, as well as collisions between trains during starting, braking, and shunting. They dissipate shock and vibration between trains, thereby reducing damage to the vehicle structure and cargo. Coupler buffers operate by compressing elastic elements to mitigate impact forces, while simultaneously absorbing impact energy through friction and damping during the deformation of the elastic elements. Currently, there are three types of buffers: friction buffers, mortar buffers, and gas-liquid buffers.

[0004] Common failures of gas-hydraulic shock absorbers include: Damage to the metal structure of the shock absorber can cause oil or gas leakage, significantly reducing shock absorber performance. Shock absorber damage can pose safety risks to both personnel and vehicles, so it is crucial to keep the shock absorber in good condition.

[0005] Common physical quantities used to detect buffer status are displacement and force. By measuring these two parameters, the buffer's status can be determined. Currently, testing of gas-hydraulic buffers typically involves removing the buffer, installing it on a large press, and then reading the force and displacement data from the press. This method is complex and wastes both manpower and material resources. Summary of the Invention

[0006] In order to address the deficiencies in the prior art, the present invention provides a gas-liquid buffer capable of monitoring the buffer status in real time without disassembling the gas-liquid buffer.

[0007] The present invention provides a gas-liquid buffer, comprising:

[0008] A cylinder body including a closed end and an open end in the axial direction;

[0009] a plunger assembly, wherein the interior of the plunger assembly is divided into an air cavity and a second liquid cavity, a portion of the plunger assembly extends from the open end into the interior of the cylinder body, a first liquid cavity is formed between the plunger assembly and the closed end, and the second liquid cavity is adjacent to and communicates with the first liquid cavity;

[0010] a throttling member, one end of which is fixed to the closed end of the cylinder body, and the other end of which extends into the interior of the cylinder body along the axial direction of the cylinder body;

[0011] in,

[0012] A measuring assembly is axially connected to the outer peripheral side of the closed end, the measuring assembly comprising a measuring tube, a first accommodating cavity formed inside the measuring tube, a displacement sensor capable of measuring the displacement of the gas-liquid buffer, and a pressure sensor capable of measuring the pressure of the first liquid cavity being disposed in the first accommodating cavity;

[0013] When the gas-liquid buffer is pressurized, the plunger assembly moves toward the closed end, the volume of the first liquid cavity decreases, and the oil in the first liquid cavity enters the second liquid cavity. The pressure sensor monitors the pressure of the oil in the first liquid cavity in real time, and the displacement sensor monitors the displacement of the plunger assembly during the compression process in real time.

[0014] In the above technical solution, by integrating a pressure sensor and a displacement sensor inside the gas-liquid buffer, pressure data and displacement data can be output in real time during the operation of the gas-liquid buffer, and it can be determined whether the gas-liquid buffer has a fault without disassembling the gas-liquid buffer.

[0015] In some embodiments of the present application, the displacement sensor is a magnetostrictive displacement sensor, comprising a mounting base, a measuring rod, and a position magnetic ring, wherein the measuring rod is fixed to the mounting base, and the position magnetic ring can be sleeved on the outer circumference of the measuring rod and can move back and forth along the measuring rod. The position magnetic ring and the measuring rod generate a pulse signal to obtain the displacement of the position magnetic ring;

[0016] The position magnetic ring is fixed to the end of the plunger assembly located in the cylinder body. When the plunger assembly moves, the position magnetic ring moves synchronously, and the relative position of the position magnetic ring and the measuring rod changes accordingly, and the displacement of the plunger assembly is measured.

[0017] In some embodiments of the present application, the mounting base of the displacement sensor is fixed to one end of the throttle member close to the measuring tube. The throttle member is a hollow tubular structure, and a second accommodating cavity capable of enclosing the measuring rod is formed therein.

[0018] In some embodiments of the present application, the plunger assembly includes a plunger and an end cover assembly arranged at one end of the plunger. The end cover assembly and part of the plunger are located in the cylinder body and can move along the inside of the cylinder body when under pressure. A first liquid chamber is formed between the end cover assembly and the closed end of the cylinder body.

[0019] In some embodiments of the present application, the end cap assembly includes an end cap seat for sealing the plunger, and a booster valve is provided on the end cap seat, so that the oil in the first liquid chamber enters the second liquid chamber through the booster valve;

[0020] The boost valve has an extension portion extending toward the second liquid chamber, and the extension portion is a hollow tubular structure, and its length is adapted to the length of the throttling member; when the gas-liquid buffer is pressurized, the throttling member can enter the extension portion and form an annular throttling gap with the extension portion, providing dynamic damping force for the compression of the gas-liquid buffer, restricting the oil flow channel, further increasing the resistance, and further increasing the damping force of the gas-liquid buffer.

[0021] In some embodiments of the present application, the position magnetic ring is fixed on the end face of the end cover seat located on the first liquid chamber. When the gas-liquid buffer is pressurized, the end cover seat drives the position magnetic ring to move synchronously. The throttling member passes through the position magnetic ring on the end cover seat and enters the extension portion. The position magnetic ring and the measuring rod in the throttling member generate a pulse signal to obtain the displacement of the position magnetic ring.

[0022] In some embodiments of the present application, a one-way valve is provided at the end of the extension portion. After the external compression load is removed, the high-pressure gas in the air cavity will force the oil in the second liquid cavity to flow back to the first liquid cavity through the one-way valve. The volume of the first liquid cavity increases, and the plunger assembly gradually recovers and exits from the cylinder body.

[0023] In some embodiments of the present application, in order to prevent the cylinder body from interfering with the pulse signal generated between the measuring rod and the position magnetic ring, thereby affecting the measurement accuracy of the displacement sensor, a magnetic isolation ring is arranged between the position magnetic ring and the end cover seat. When the gas-liquid buffer is pressurized, the throttling element passes through the position magnetic ring and the magnetic isolation ring in turn, and then enters the extension part.

[0024] In some embodiments of the present application, an oil channel is opened axially at the closed end, and the oil in the first liquid chamber enters the pressure sensor through the oil channel. After the pressure sensor measures the pressure of the oil, it transmits the pressure data to the data acquisition controller.

[0025] In some embodiments of the present application, a data acquisition controller is further provided in the first accommodating cavity, and the data acquisition controller is used to receive data from the displacement sensor and the pressure sensor, and perform data conversion and processing;

[0026] A data interface is provided on the outside of the measuring tube, and the data acquisition controller is connected to the data interface. The data interface is used to receive and reprocess the data processed by the data acquisition controller.

[0027] Based on the above technical solution, the embodiment of the present invention integrates a pressure sensor and a displacement sensor inside the gas-liquid buffer, which can output pressure data and displacement data in real time during the operation of the gas-liquid buffer. It can determine whether the gas-liquid buffer is faulty without disassembling the gas-liquid buffer, saving manpower and material resources, reducing maintenance costs, and providing new ideas for intelligent and modular couplers.

[0028] An integrated design approach is adopted, and the displacement sensor and pressure sensor are encapsulated inside the gas-liquid buffer assembly. The data acquisition controller processes the data collected from the displacement sensor and pressure sensor and outputs it to the data interface to facilitate data reception. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 is a cross-sectional view of a gas-liquid buffer according to an embodiment of the present invention;

[0031] Figure 2 for Figure 1 A schematic cross-sectional view of the displacement sensor and throttling element of the illustrated embodiment;

[0032] Figure 3 for Figure 1 a schematic cross-sectional view of the end cap assembly of the illustrated embodiment;

[0033] Figure 4 This is a schematic diagram of the three-dimensional structure of a boost valve according to an embodiment of the present invention;

[0034] Figure 5 for Figure 1 A schematic diagram of the three-dimensional structure of the gas-liquid buffer of the embodiment shown.

[0035] In the picture:

[0036] 10. Cylinder body; 11. Closed end; 111. Oil channel; 12. Open end; 13. First liquid chamber; 20. Plunger assembly; 21. Plunger; 22. End cover assembly; 221. End cover seat; 2211. Through hole; 222. Booster valve; 223. Extension; 2231. One-way valve; 23. Oil-gas isolation piston; 24. Second liquid chamber; 25. Gas chamber; 30. Throttle element; 31. Second accommodating chamber; 40. Measuring tube; 41. First accommodating chamber; 42. Displacement sensor; 421. Mounting seat; 422. Measuring rod; 423. Position magnetic ring; 424. Isolation magnetic ring; 43. Pressure sensor; 44. Data acquisition controller; 45. Data interface. DETAILED DESCRIPTION

[0037] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0039] The terms "first," "second," and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of such features.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0041] like Figure 1-2 As shown, a gas-liquid buffer as an embodiment of the present invention includes:

[0042] The cylinder body 10 includes a closed end 11 and an open end 12 in the axial direction; it is a high-pressure container filled with oil;

[0043] The plunger assembly 20 includes a plunger 21 and an end cap assembly 22. The plunger 21 is inserted into the cylinder 10 from the open end 12. The end cap assembly 22 is disposed at the port where the plunger 21 is inserted into the cylinder 10. A first liquid chamber 13 is formed between the end cap assembly 22 and the closed end 11 of the cylinder 10. In this embodiment, the first liquid chamber 13 is a high-pressure oil chamber.

[0044] The oil-gas isolation piston 23 is disposed inside the plunger 21 and is movable axially along the plunger 21 to separate the interior of the plunger into a second liquid chamber 24 communicating with the first liquid chamber 13 and an air chamber 25. In this embodiment, the second liquid chamber 24 is a low-pressure oil chamber.

[0045] The throttling member 30 has one end fixed to the closed end 11 of the cylinder body 10 and extends axially toward the interior of the cylinder body 10. When the gas-liquid buffer is pressurized, the plunger assembly 20 moves toward the closed end 11, the volume of the first liquid chamber 13 decreases, and the oil enters the second liquid chamber 24 from the first liquid chamber 13 through the end cover assembly 22. The oil in the second liquid chamber 24 pushes the oil-gas isolation piston toward the air chamber 25, and the volume of the air chamber 25 is compressed. When the stroke of the gas-liquid buffer increases to form an annular throttling gap between the throttling member 30 and the end cover assembly 22, a fluid damping force is generated, and the passage of the oil from the first liquid chamber 13 to the second liquid chamber 24 is further restricted, further increasing the damping force of the gas-liquid buffer.

[0046] A measuring assembly is axially connected to the outside of the closed end 11 of the cylinder body 10. The cylinder body 10 bears the tensile and compressive forces transmitted by the measuring assembly. The measuring assembly includes a measuring tube 40. A first accommodating chamber 41 is formed inside the measuring tube 40. A displacement sensor 42 and a pressure sensor 43 are provided in the first accommodating chamber 41. The displacement sensor 42 is used to detect the displacement of the plunger assembly 20 of the gas-liquid buffer during compression. The pressure sensor 43 is used to detect the pressure value in the first liquid chamber 13, i.e., the high-pressure oil chamber.

[0047] In this embodiment, by integrating a pressure sensor and a displacement sensor inside the gas-liquid buffer, pressure data and displacement data can be output in real time during the operation of the gas-liquid buffer, and it can be determined whether the gas-liquid buffer has a fault without disassembling the gas-liquid buffer.

[0048] like Figure 1 As shown, a data acquisition controller 44 is also provided in the first accommodating chamber 41. The data acquisition controller 44 is connected to the displacement sensor 42 and the pressure sensor 43 through a data line. The data acquisition controller 44 is used to receive the displacement data of the plunger assembly measured by the displacement sensor 42 and the pressure data of the first liquid chamber 13 monitored by the pressure sensor 43, and convert and process the corresponding data; specifically, the data acquisition controller 44 receives the real-time displacement data monitored by the displacement sensor 42; at the same time, the pressure value monitored by the received pressure sensor 43 is calculated, and the pressure value is multiplied by the inner end surface area of ​​the first liquid chamber 12, which is the external pressure exerted on the gas-liquid buffer; a data interface 45 is provided on the outside of the measuring tube 40, and the data acquisition controller 44 is connected to the data interface 45 through a data connection line. The data interface 45 is used to receive and reprocess the displacement and pressure data processed by the data acquisition controller 44.

[0049] In this embodiment, Figure 2 As shown, the displacement sensor 42 is a magnetostrictive displacement sensor, including a mounting seat 421, a measuring rod 422 and a position magnetic ring 423. There is a waveguide wire inside the measuring rod 422, and the position magnetic ring 423 can be sleeved on the outside of the measuring rod 422. The measuring rod 422 is fixed on the mounting seat 421. The position magnetic ring 423 can be sleeved on the outer peripheral side of the measuring rod 422 and can slide back and forth along the measuring rod 422. The position magnetic ring 423 and the measuring rod 422 generate a pulse signal.

[0050] Continue to see Figure 2 The throttling member 30 is a hollow tubular structure, and a second accommodating chamber 31 is formed inside the throttling member 30 to accommodate the measuring rod 422 of the displacement sensor 42. The displacement sensor is integrated with the throttling member 30, and the displacement change of the gas-liquid buffer is sensed by the movement of the plunger; the throttling member 30 is fixed to one end of the cylinder body 10 and has an opening, and the end thereof extending into the cylinder body 10 is closed. The measuring rod 422 is enclosed inside the second accommodating chamber 31, is not affected by the external environment, and has high measurement accuracy.

[0051] In this embodiment, the gas-liquid buffer is pressurized, the plunger assembly 20 is displaced, and the throttling member 30 and the end cover assembly 22 form an annular throttling gap, wherein the end cover assembly 22 includes

[0052] The end cap seat 221 is fixed to one end of the plunger 21 located inside the cylinder body 10 by means of threads. A through hole 2211 is formed in the center of the end cap seat 221. The through hole 2211 serves as a flow passage between the first liquid chamber 13 and the second liquid chamber 22.

[0053] One end of the boost valve 222 is fixed to the through hole 2211 of the end cover seat 221. The inlet of the boost valve 222 is located in the first liquid chamber 13. The oil in the first liquid chamber 13 enters the second liquid chamber 24 through the boost valve 222. The boost valve 222 amplifies the pressure of the oil in the second liquid chamber 22.

[0054] like Figure 4 As shown, the boost valve 222 further includes an extension portion 223, which is a hollow tubular structure and is formed by the inlet of the boost valve 222 extending axially toward the second liquid chamber 24. The length of the extension portion 223 is adapted to the length of the throttle member 30. In this embodiment, the length of the throttle member 30 is adapted to the length of the measuring rod 422 of the position sensor 42, and the length of the extension portion 223 is adapted to the length of the throttle member 30. The lengths of the throttle member 30 and the extension portion 223 match the length of the measuring rod 422 of the displacement sensor. The throttle member 30 and the extension portion 223 are both hollow structures, ensuring the installation of the displacement sensor and the measurement accuracy.

[0055] When the gas-liquid buffer is under pressure, the throttling piece 30 enters the extension part 223 through the through hole 2211 and forms an annular throttling gap with the through hole 2211, providing a dynamic damping effect for the buffer under compression conditions. The oil flow channel is restricted, the resistance is further increased, and the damping force of the gas-liquid buffer is further increased; the oil in the first liquid chamber 13 enters the boost valve 222 through the annular throttling gap and then enters the second liquid chamber 24.

[0056] A one-way valve 2231 is provided at the end of the extension 223. When the external compressive load is removed, the high-pressure gas in the air chamber 25 compresses the oil-gas isolation piston 23 to move in the opposite direction, reducing the volume of the second liquid chamber 24. The oil in the second liquid chamber 24 flows through the one-way valve 2231 at the end of the extension 223 to the first liquid chamber 13. The volume of the first liquid chamber 13 increases, and the plunger assembly 20 gradually recovers and exits the cylinder body 10. The provision of the one-way valve 2231 ensures that when the external force is removed, the oil can achieve one-way flow from the second liquid chamber 24 to the first liquid chamber 13.

[0057] The position magnetic ring 423 of the magnetostrictive displacement sensor is fixed to the end face of the end cover seat 221 located at the end surface of the first liquid chamber 13 by bolts. When the gas-liquid buffer is pressurized, the plunger 21 and the end cover assembly 22 move toward the closed end 11, and the end cover seat 221 drives the position magnetic ring 423 to move synchronously. The initial position of the throttle member 30 is located at the inlet position of the boost valve 222. When the plunger 21 moves under pressure, the throttle member 30 passes through the position magnetic ring 423 and enters the extension part 223. The position magnetic ring 423 and the waveguide wire in the measuring rod 422 in the throttle member 30 generate a pulse signal, and the displacement of the position magnetic ring 423 is obtained, that is, the displacement of the plunger assembly 20 is obtained.

[0058] In this embodiment, in order to prevent the cylinder body 10 from interfering with the pulse signal generated between the measuring rod 422 and the position magnetic ring 423, thereby affecting the measurement accuracy of the displacement sensor 42, a magnetic isolation ring 424 is arranged between the position magnetic ring 423 and the end cover seat 221, and the magnetic isolation ring 424 is made of non-metallic material; when the gas-liquid buffer is pressurized, the throttling member 30 passes through the position magnetic ring 423 and the magnetic isolation ring 424 in turn, and then enters the extension part 223.

[0059] In order to enable the pressure sensor 43 to directly measure the pressure of the oil in the first liquid chamber 13, the closed end 11 is axially opened with an oil channel 111. The oil in the first liquid chamber 13 enters the pressure sensor 43 through the oil channel 111. After the pressure sensor 43 measures the pressure of the oil, it transmits the pressure data to the data acquisition controller 44. The data acquisition controller 44 calculates the pressure value monitored by the pressure sensor 43, and multiplies the pressure value by the inner end surface area of ​​the first liquid chamber 13 to obtain the external pressure on the gas-liquid buffer.

[0060] like Figure 1As shown, when the gas-liquid buffer of this embodiment is subjected to dynamic impact compression, the plunger 21 moves along the cylinder body 10 toward the closed end 11, and the oil in the first liquid chamber 13 enters the second liquid chamber 24 through the booster valve 222. The oil in the gap between the booster valve 222 and the through hole 2211 of the end cover seat 221 generates the buffer damping force. When the gas-liquid buffer is compressed, the throttling member 30 gradually enters the through hole 2211 of the end cover seat 221, and the throttling member 30 and the through hole 2211 form an annular throttling gap. The flow channel of the oil is further restricted, its resistance is further increased, and the buffer damping force is further increased; when the oil is pressed from the first liquid chamber 13 into the second liquid chamber 24, the oil in the second liquid chamber 24 will push the oil-gas isolation piston 23 to compress the volume of the air chamber 25. The greater the compression stroke of the gas-liquid buffer, the greater the volume of the air chamber 25 is compressed, the greater the pressure in the air chamber 25, and the greater the pressure acting on the oil-gas isolation piston 23. When the external compression load applied to the gas-liquid buffer is removed, the high-pressure gas in the gas chamber 25 will force the oil-gas isolation piston 23 to move in the opposite direction, the volume of the second liquid chamber 24 is compressed, and the oil flows to the first liquid chamber 13 through the one-way valve 2231. The volume of the first liquid chamber 13 increases, the gas-liquid buffer gradually recovers, and the plunger 21 withdraws and resets from the cylinder body 10; during the force-bearing action of the gas-liquid buffer, the displacement sensor 42 monitors the displacement stroke of the plunger 21 in real time, and the pressure sensor 43 monitors the pressure value of the oil in the first liquid chamber 13. The data acquisition controller 44 receives data from the displacement sensor 42 and the pressure sensor 43, and after converting and processing the data, the external device is connected to the data interface 45 to output the real-time displacement and impedance data of the gas-liquid buffer.

[0061] In this embodiment, one end of the measuring tube 41 is connected to the cylinder body 10 through a thread, and the other end is connected to the external structure; a groove is arranged on the outer wall of the plunger 21, and an oil sealing ring is installed in the groove, and the plunger is installed in the inner cavity of the cylinder body 10 to form a sealed chamber; the end cover seat 221 is threadedly connected to the plunger 21; the throttle member 30 is fixed to the sealing end 11 of the cylinder body 10 through a thread, the mounting seat 421 of the displacement sensor 42 is threadedly connected to the throttle member 30, the pressure sensor 43 is threadedly connected to the closed end 11 of the cylinder body 10, the data acquisition controller 44 is fixed in the first accommodating chamber 41 by bolts, and the data interface 45 is fixed to the measuring tube 40 by bolts.

[0062] The above embodiment integrates a pressure sensor and a displacement sensor inside the gas-liquid buffer, which can output pressure data and displacement data in real time during the operation of the gas-liquid buffer. It can determine whether the gas-liquid buffer is faulty without disassembling the gas-liquid buffer, saving manpower and material resources, reducing maintenance costs, and providing new ideas for intelligent and modular couplers.

[0063] An integrated design approach is adopted, and the displacement sensor and pressure sensor are encapsulated inside the gas-liquid buffer assembly. The data acquisition controller processes the data collected from the displacement sensor and pressure sensor and outputs it to the data interface to facilitate data reception.

[0064] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to preferred embodiments, persons skilled in the art should understand that the specific implementation methods of the present invention may still be modified or some technical features may be replaced by equivalents without departing from the spirit of the technical solutions of the present invention, and all of these should fall within the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A gas-liquid buffer, characterized in that: include: A cylinder body including a closed end and an open end in the axial direction; a plunger assembly, wherein the interior of the plunger assembly is divided into an air cavity and a second liquid cavity, a portion of the plunger assembly extends from the open end into the interior of the cylinder body, a first liquid cavity is formed between the plunger assembly and the closed end, and the second liquid cavity is adjacent to and communicates with the first liquid cavity; a throttle member, one end of which is fixed to the closed end of the cylinder body, and the other end of which extends into the interior of the cylinder body along the axial direction of the cylinder body; in, A measuring assembly is axially connected to the outer peripheral side of the closed end, the measuring assembly comprising a measuring tube, a first accommodating cavity formed inside the measuring tube, a displacement sensor capable of measuring the displacement of the gas-liquid buffer, and a pressure sensor capable of measuring the pressure of the first liquid cavity being disposed in the first accommodating cavity; When the gas-liquid buffer is pressurized, the plunger assembly moves toward the closed end, the volume of the first liquid cavity decreases, and the oil in the first liquid cavity enters the second liquid cavity. The pressure sensor monitors the pressure of the oil in the first liquid cavity in real time, and the displacement sensor monitors the displacement of the plunger assembly during the compression process in real time. The displacement sensor is a magnetostrictive displacement sensor, comprising a mounting base, a measuring rod, and a position magnetic ring. The measuring rod is fixed to the mounting base, and the position magnetic ring can be sleeved on the outer circumference of the measuring rod and can slide back and forth along the measuring rod. The position magnetic ring and the measuring rod generate a pulse signal. The throttling element is a hollow tubular structure with a second accommodating cavity formed inside it that can accommodate the measuring rod of the displacement sensor. The displacement sensor is integrated with the throttling element and senses the displacement change of the gas-liquid buffer through the movement of the plunger. The plunger assembly includes a plunger and an end cap assembly provided at one end of the plunger. The end cap assembly includes an end cap seat for sealing the plunger. A booster valve is provided on the end cap seat. The oil in the first liquid chamber enters the second liquid chamber through the booster valve. The boost valve has an extension portion, which is a hollow tubular structure and is formed by the inlet of the boost valve extending axially toward the second liquid chamber, and the length of the extension portion is adapted to the length of the throttling member; When the gas-liquid buffer is under pressure, the throttling piece enters the extension part through the through hole and forms an annular throttling gap with the through hole, providing a dynamic damping effect for the buffer under compression conditions. The oil flow channel is restricted, the resistance is further increased, and the damping force of the gas-liquid buffer is further increased; the oil in the first liquid chamber enters the boost valve through the annular throttling gap and then enters the second liquid chamber.

2. The gas-liquid buffer according to claim 1, characterized in that The position magnetic ring is fixed to the end of the plunger assembly located in the cylinder body. When the plunger assembly moves, the position magnetic ring moves synchronously, and the relative position of the position magnetic ring and the measuring rod changes accordingly, and the displacement of the plunger assembly is measured.

3. The gas-liquid buffer according to claim 2, characterized in that: The mounting base of the displacement sensor is fixed to one end of the throttling member close to the measuring tube. The throttling member is a hollow tubular structure, and a second accommodating cavity capable of sealing the measuring rod is formed therein.

4. The gas-liquid buffer according to claim 1, characterized in that The end cap assembly and part of the plunger are located in the cylinder body and can move along the interior of the cylinder body when under pressure. A first liquid chamber is formed between the end cap assembly and the closed end of the cylinder body.

5. The gas-liquid buffer according to claim 1, characterized in that: The position magnetic ring is fixed on the end surface of the end cover seat located in the first liquid chamber. When the gas-liquid buffer is pressurized, the end cover seat drives the position magnetic ring to move synchronously. The throttling member passes through the position magnetic ring on the end cover seat and enters the extension part. The position magnetic ring and the measuring rod in the throttling member generate a pulse signal to obtain the displacement of the position magnetic ring.

6. The gas-liquid buffer according to claim 1, characterized in that A one-way valve is provided at the end of the extension portion. After the external compressive load is removed, the high-pressure gas in the gas cavity will compel the oil in the second liquid cavity to flow back to the first liquid cavity through the one-way valve.

7. The gas-liquid buffer according to claim 1, characterized in that A magnetic isolation ring is provided between the position magnetic ring and the end cover seat to isolate the external magnetic field interference. When the gas-liquid buffer is pressurized, the throttling member passes through the position magnetic ring and the magnetic isolation ring in sequence and then enters the extension portion.

8. The gas-liquid buffer according to claim 1, characterized in that: The closed end is provided with an oil passage along its axial direction, and the oil in the first liquid cavity enters the pressure sensor through the oil passage, and the pressure sensor measures the pressure in the first liquid cavity.

9. The gas-liquid buffer according to claim 1, characterized in that: A data acquisition controller is also provided in the first accommodating cavity, and is used to receive data from the displacement sensor and the pressure sensor, and to convert and process the data; A data interface is provided on the outside of the measuring tube, and the data acquisition controller is connected to the data interface. The data interface is used to receive and reprocess the data processed by the data acquisition controller.

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