A hydraulic cylinder

Abstract

The utility model relates to hydraulic cylinder technical field discloses a kind of hydraulic cylinder, including cylinder barrel and cylinder bottom, the piston rod is equipped in the cylinder barrel, the piston rod protrudes from the opposite side of the cylinder bottom, and the piston rod and the cylinder bottom form rodless cavity in the cylinder barrel;Sensor device is installed on the cylinder bottom, and the sensor device includes radar probe, and the cylinder bottom between the radar probe and the piston rod is equipped with the radar wave hole for the ultrasonic wave of the radar probe passing of radar through wave hole. The utility model installs the sensor device on the cylinder bottom, and the first shell is installed along the radial direction of the hydraulic cylinder, and it is convenient to repair and disassemble, the radar probe does not need to be installed with the piston rod contact type, reduce the processing amount of piston rod, and compared with prior art sensor device, it is easier to disassemble from the cylinder bottom.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a hydraulic cylinder. Background Technology

[0002] Currently, contact sensors, such as magnetostrictive sensors, are commonly used for detecting the position of hydraulic cylinder pistons. However, these sensors have drawbacks, such as large space requirements, complex structures, and the need for deep hole machining. Traditional built-in displacement sensors pose significant challenges to the machining, installation, maintenance, and replacement of hydraulic cylinders. Utility Model Content

[0003] The present invention aims to at least solve the problems existing in the prior art, such as large space occupation, complex structure, large amount of piston rod machining, and difficulty in maintenance and replacement.

[0004] Therefore, one objective of this utility model is to provide a hydraulic cylinder, including a cylinder body and a piston rod disposed in the cylinder body, one end of the piston rod extending out of the cylinder body, and the other end of the piston rod dividing the inner cavity of the cylinder body into a rodless cavity and a rod cavity;

[0005] A sensor device is provided on the cylinder body near the rodless cavity. The sensor device includes a radar probe, which is positioned along the axial direction of the piston rod. A radar through hole is provided on the cylinder body along its axial direction to cooperate with the radar probe, and the radar through hole communicates with the rodless cavity.

[0006] In some embodiments, the sensor device further includes a temperature probe, a pressure probe, and a ranging circuit board, wherein the temperature probe, the pressure probe, and the radar probe are all connected to the ranging circuit board.

[0007] In some embodiments, the cylinder body includes a cylinder barrel and a cylinder bottom disposed at one end of the cylinder barrel. The sensor device is mounted radially on the cylinder bottom. The sensor device includes a first housing located inside the cylinder bottom and a second housing located outside the cylinder bottom. The radar probe, temperature probe, and pressure probe are mounted in the first housing. The ranging circuit board is mounted in the second housing. The radar wave passage is provided at one end of the cylinder bottom near the cylinder barrel.

[0008] In some embodiments, a first mounting hole is provided on the side of the first housing near the radar wave pass, the first mounting hole is connected to the radar wave pass, a pressure-isolating plate is installed on the first mounting hole, and the radar probe is installed on the side of the pressure-isolating plate away from the radar wave pass; the temperature probe is installed on the inner wall of the first housing, and a second mounting hole for installing the pressure probe is also provided on the first housing, the second mounting hole is connected to the rodless cavity.

[0009] In some embodiments, an anti-rotation structure is connected to the end of the first housing away from the cylinder bottom, the anti-rotation structure including an anti-rotation plate, the anti-rotation plate being snapped into the first housing.

[0010] In some embodiments, the anti-rotation plate is also connected to the first housing via a fastener; the second housing is integrally connected to the anti-rotation plate, and a through hole is provided on the second housing and the anti-rotation plate.

[0011] In some embodiments, a third mounting hole is provided on the bottom of the cylinder, the first housing is disposed in the third mounting hole, the third mounting hole communicates with the radar wave aperture, and a first sealing element and a second sealing element are provided at the connection between the inner wall of the third mounting hole and the first housing, the first sealing element and the second sealing element are located on the radial sides of the radar wave aperture, and the diameters of the first sealing element and the second sealing element are equal.

[0012] In some embodiments, a pressure relief passage communicating with the third mounting hole is provided on the bottom of the cylinder.

[0013] In some embodiments, the pressure diaphragm is made of ceramic, polyetheretherketone, stainless steel, or carbon fiber.

[0014] In some embodiments, the axis of the radar pass-through aperture is perpendicular to the end face of the piston rod.

[0015] In some embodiments, the pressure probe is mounted on an auxiliary pressure measuring element, the auxiliary pressure measuring element is mounted on the second mounting hole, the auxiliary pressure measuring element has a pressure measuring channel for liquid in the rodless chamber to pass through, and the pressure probe is mounted inside the pressure measuring channel.

[0016] This utility model discloses a hydraulic cylinder, which has the following beneficial effects:

[0017] This invention mounts the sensor device on the bottom of the cylinder, with the first housing installed radially along the cylinder body, facilitating easy assembly and disassembly. The radar probe does not require contact with the piston rod, reducing the amount of machining required for the piston rod. Compared to existing technologies, the sensor device is easier to remove from the cylinder bottom. Furthermore, compared to structures using magnetostrictive sensors for distance measurement, this invention's sensor device occupies less space. This invention considers the influence of medium temperature and pressure on sound wave velocity, using temperature and pressure probes to measure the temperature and pressure to correct for the sound wave velocity, thereby improving the accuracy of the measured piston rod position. A first seal and a second seal are installed on the outer wall of the first housing. The first and second seals have equal diameters, ensuring equal pressure on the first housing from both above and below, placing it in a state of force balance. Compared to existing sensor devices where force is concentrated on one side, the first housing in this invention experiences less vibration, higher reliability, avoids equipment damage, and extends the equipment's lifespan. This invention provides a pressure relief channel below the third mounting hole, allowing leaked liquid to flow out and preventing pressure buildup. By setting an anti-rotation plate that engages with the first housing, the rotation of the first housing is prevented, thus avoiding interference with the probe's function. Furthermore, the anti-rotation plate is connected to the first housing via a fastener, facilitating the disassembly of the first housing. A through-hole is also provided, allowing workers to insert tools such as screws into the through-hole. The screw contacts the surface of the cylinder bottom near the anti-rotation plate, and by rotating the screw, the first housing, second housing, and anti-rotation plate can be removed from the cylinder bottom, saving time and effort and facilitating maintenance and replacement.

[0018] This utility model has advantages such as compact structure and convenient processing and installation. It can be used in hydraulic cylinders for media such as gas, water, and oil, and can achieve measurement accuracy of 0-2000mm with millimeter-level precision. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a hydraulic cylinder according to this utility model;

[0021] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0022] Figure 3 This is a top view of a hydraulic cylinder according to this utility model;

[0023] Figure 4 This is a schematic diagram of a sensor device for a hydraulic cylinder according to the present invention;

[0024] Figure 5 This is a schematic diagram of the first housing and anti-rotation plate of a hydraulic cylinder according to the present invention.

[0025] Figure label:

[0026] 100. Cylinder barrel; 200. Cylinder bottom; 300. Sensor device; 301. First housing; 302. Radar probe; 303. Radar waveguide; 304. Temperature probe; 305. Pressure probe; 306. First mounting hole; 307. Pressure diaphragm; 308. Second mounting hole; 309. Auxiliary pressure measuring element; 310. Pressure measuring channel; 311. Third mounting hole; 312. First seal; 313. Second seal; 314. Pressure relief channel; 315. Pressure relief element; 316. Anti-rotation plate; 317. Locking block; 318. Locking slot; 319. Distance measuring circuit board; 320. Controller; 321. Second housing; 322. Bolt; 323. Through hole; 324. Dust cap; 325. First liquid inlet; 326. Second liquid inlet; 327. Pin; 328. Communication cable end; 329. Plug; 330. Snap ring; 331. Sensor digital communication connector; 332. Annular groove; 400. Piston rod; 500. Reversing valve; 600. End cap. Detailed Implementation

[0027] Various embodiments and features of this utility model are described herein with reference to the accompanying drawings.

[0028] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this invention will be apparent to those skilled in the art.

[0029] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, serve to explain the principles of the present invention.

[0030] These and other features of the present invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0031] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the present invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0032] The above and other aspects, features and advantages of the present invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0033] Specific embodiments of the present invention will now be described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present invention, which may be implemented in various ways. Well-known and / or repeated functions and structures have not been described in detail to avoid unnecessary or redundant details that could obscure the present invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of substantially any suitable detailed structures.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0036] In the description of this utility model, "multiple" means two or more.

[0037] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0038] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0039] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

[0041] like Figure 1 and Figure 2 As shown, an embodiment of this utility model provides a hydraulic cylinder, including a cylinder body. The cylinder body includes a cylinder barrel 100 and a cylinder bottom 200. A piston rod 400 is disposed inside the cylinder barrel 100. One end of the piston rod 400 extends from an end cap 600 on the opposite side of the cylinder bottom 200. The other end of the piston rod 400 divides the inner cavity of the cylinder body into a rodless cavity and a rod cavity. The piston rod 400 and the cylinder bottom 200 form the rodless cavity within the cylinder barrel 100. A sensor device 300 is mounted on the cylinder bottom 200. The sensor device 300 includes... A first housing 301 is connected to the cylinder bottom 200. The axis of the first housing 301 is perpendicular to the axis of the piston rod 400. A radar probe 302 is installed inside the first housing 301. A radar wave passage 303 is provided on the cylinder bottom 200 between the radar probe 302 and the piston rod 400 to allow ultrasonic waves, millimeter waves, etc., emitted by the radar probe 302 to pass through the radar wave passage 303. The sound waves emitted by the radar probe 302 are reflected back by the piston rod 400 after passing through the radar wave passage 303, thereby measuring the position information of the piston rod 400.

[0042] In this invention, the sensor device 300 is mounted on the cylinder bottom 200, and the first housing 301 is perpendicular to the piston rod 400. The radar probe 302 does not need to be installed in contact with the piston rod 400, which reduces the amount of machining required for the piston rod 400. At the same time, compared with the prior art, the sensor device 300 is easier to remove from the cylinder bottom 200.

[0043] To further improve the accuracy of the radar probe 302 in measuring the position of the piston rod 400, a temperature probe 304 and a pressure probe 305 are also provided inside the first housing 301. The temperature probe 304 can measure the temperature of the liquid inside the rodless cavity, and the pressure probe 305 can measure the pressure of the liquid inside the rodless cavity. The sound wave velocity is corrected based on the temperature and pressure. The product of the corrected sound wave velocity and the sound wave propagation time is then divided by two to obtain the distance between the piston rod 400 and the radar probe 302. This invention considers the influence of medium temperature and pressure on the sound wave velocity, using the temperature and pressure measured by the temperature probe 304 and the pressure probe 305 to correct the sound wave velocity, thereby improving the accuracy of the measured position of the piston rod 400. Specifically, the sound velocity-temperature-pressure formula is as follows:

[0044] V(P,t)=V0+5.0383T-0.0579T 2 +3.34*10 -4 T 3 +(1.60+A*T)(P-101325) / 101325;

[0045] Where V is the corrected speed of sound; V0 is the initial speed of sound of the radar probe 302; P is the pressure; T is the temperature; and A is an empirical constant with a value range of -0.01 to 0.015.

[0046] Specifically, a first mounting hole 306 is provided on the side of the first housing 301 near the radar wave port 303. A pressure-isolating plate 307 is installed on the first mounting hole 306 to prevent liquid in the rodless cavity from entering the first housing 301. The sound waves emitted by the radar probe 302 can pass through the pressure-isolating plate 307 and interfere with the piston rod 400 before being reflected back. The pressure-isolating plate 307 is made of a material that allows ultrasonic waves to pass through, such as ceramic, polyetheretherketone (PEEK), stainless steel, carbon fiber, etc. The pressure-isolating plate 307 is connected to the first mounting hole 306 by a retaining spring 330.

[0047] Specifically, the first housing 301 is further provided with a second mounting hole 308, which is used to install the pressure probe 305. The liquid in the rodless cavity can contact the pressure probe 305 to achieve pressure measurement. More specifically, the pressure probe 305 is installed on an auxiliary pressure measuring element 309, which is installed in the second mounting hole 308. The auxiliary pressure measuring element 309 is provided with a pressure measuring channel 310 for the liquid in the rodless cavity to pass through. The pressure measuring channel 310 is connected to the inside of the first housing 301. The pressure probe 305 is installed at the end of the pressure measuring channel 310 away from the inside of the first housing 301. After the liquid enters the pressure measuring channel 310, it contacts the pressure probe 305 to achieve pressure measurement.

[0048] Specifically, the first housing 301 is made of metal and is a good conductor of heat. The temperature probe 304 is installed on the inner wall of the first housing 301. When the liquid in the rodless cavity comes into contact with the first housing 301, it can transfer heat to the first housing 301, thereby enabling the temperature probe 304 to measure the temperature of the liquid.

[0049] Furthermore, to prevent the first housing 301 from oscillating due to uneven force distribution and collision between the first housing 301 and the cylinder bottom 200, which could damage the equipment, a third mounting hole 311 is provided on the cylinder bottom 200. The first housing 301 is installed in the third mounting hole 311. A first sealing element 312 and a second sealing element 313 are installed on the outer walls of the first housing 301 on both radial sides of the radar wave aperture. The diameters of the first sealing element 312 and the second sealing element 313 are equal, thus ensuring that the pressure on the first housing 301 is equal and that the first housing 301 is in a state of force balance. Compared with the situation of concentrated force on one side of the sensor equipment in the prior art, the first housing 301 in this utility model has less vibration, higher reliability, avoids equipment damage, and extends the service life of the equipment.

[0050] In this embodiment, to prevent liquid leakage into the third mounting hole 311 due to damage to the seal installed on the first housing 301, which could cause a pressure buildup hazard, a pressure relief channel 314 is provided below the third mounting hole 311. Leaking liquid can flow out through the pressure relief channel 314. To prevent liquid backflow through the pressure relief channel 314, a pressure relief element 315 is installed in the pressure relief channel 314. Specifically, the pressure relief element 315 is a one-way valve. Furthermore, an annular groove 332 is provided at the connection between the third mounting hole 311 and the radar wave aperture 303, so that the first housing 301 is radially balanced, reducing the vibration of the first housing 301; the radar wave aperture 303 coincides with the central axis of the piston rod 400.

[0051] Furthermore, to prevent the first housing 301 from rotating during operation, the hydraulic cylinder also includes an anti-rotation plate 316. The anti-rotation plate 316 is engaged with the end of the first housing 301 away from the cylinder bottom 200. Specifically, a locking block 317 is provided at the end of the first housing 301 away from the cylinder bottom 200, and a locking groove 318 is provided on the anti-rotation plate 316 to cooperate with the locking block 317, thereby preventing the first housing 301 from rotating in the second mounting hole 308. Specifically, the locking block 317 has a strip-shaped structure, and the shape of the locking groove 318 matches the shape of the locking block 317.

[0052] To facilitate the removal of the first housing 301 from the second mounting hole 308, the anti-rotation plate 316 is also connected to the first housing 301 by a fastener, such as a pin 327. The first housing 301 can be pulled out by removing and installing the anti-rotation plate 316, saving manpower and time.

[0053] To measure the distance, pressure, and temperature of the radar probe 302, pressure probe 305, and temperature probe 304, the sensor device 300 further includes a ranging circuit board 319, a sensor digital communication connector 331, and a controller 320. The ranging circuit board 319 is electrically connected to the sensor digital communication connector 331, and the sensor digital communication connector 331 is electrically connected to the controller 320. The ranging circuit board 319 is connected to the radar probe 302, temperature probe 304, and pressure probe 305 via a communication cable 328. The controller 320 can measure the distance, pressure, and temperature by controlling the sensor digital communication connector 331 and the ranging circuit board 319. The controller 320 has a built-in distance compensation method calculation program, which includes the aforementioned sound velocity-temperature-pressure formula. The distance compensation method calculation program uses temperature and pressure data to correct the ultrasonic velocity and then calculates the distance between the piston rod and the radar probe.

[0054] Furthermore, such as Figure 3 , Figure 4 and Figure 5 As shown, the ranging circuit board 319 is disposed in the second housing 321, which is connected to the anti-rotation plate 316. Preferably, the second housing 321 is installed above the anti-rotation plate 316, and the two are connected as one unit by bolts 322. To facilitate the disassembly and assembly of the second housing 321, the anti-rotation plate 316, and the first housing 301, a through hole 323 is provided through the second housing 321 and the anti-rotation plate 316. By inserting a tool such as a screw into the through hole 323, with the screw contacting the surface of the cylinder bottom 200 near the anti-rotation plate 316, and by continuing to rotate the screw or other tool, the first housing 301, the second housing 321, and the anti-rotation plate 316 can be removed from the cylinder bottom 200. When not disassembling, a dust cap 324 is installed on the through hole 323.

[0055] Specifically, the ranging circuit board 319 includes a temperature detection circuit, a boost excitation pulse circuit, a signal amplification and shaping circuit, a pressure sensing element, a processor, etc. This part belongs to the prior art and will not be described in detail here. In addition, in order to avoid liquid leakage in the rodless cavity, a plug 329 is installed on the side of the first housing 301 opposite to the radar wave port 303.

[0056] In this embodiment, a first inlet hole 325 communicating with the rodless chamber is provided on the cylinder bottom 200, and a second inlet hole 326 communicating with the rod chamber is provided on the cylinder barrel 100. The first inlet hole 325 and the second inlet hole 326 are connected to a reversing valve 500, which is connected to a controller 320. The controller 320 can control the reversing valve 500 to reverse.

[0057] Specifically, the control method for the piston rod 400 of the hydraulic cylinder is as follows: the controller 320 sets the target position of the piston rod 400, and the directional valve 500 is given a command to control the piston rod 400 to extend and retract. The radar probe 302 emits ultrasonic waves to the piston rod 400. The temperature probe 304 detects the temperature of the medium in the rodless cavity, and the pressure probe 305 detects the pressure in the rodless cavity. The controller 320 obtains the position information of the piston rod based on the initial velocity of the ultrasonic waves, the return time of the ultrasonic waves, the medium temperature, and the medium pressure.

[0058] When the piston rod 400 reaches the set position, the controller 320 controls the reversing valve 500 to reset, and the hydraulic cylinder stops its extension and retraction movement, thus realizing the control and application of the sensor device 300, including the radar probe 302, on the extension and retraction of the hydraulic cylinder in the downhole working face.

[0059] This invention mounts the sensor device 300 on the cylinder bottom 200, with the first housing 301 perpendicular to the piston rod 400. The radar probe 302 does not need to be installed in contact with the piston rod 400, reducing the machining workload of the piston rod 400. Furthermore, compared to existing technologies, the sensor device 300 is easier to remove from the cylinder bottom 200. This invention considers the influence of medium temperature and pressure on sound wave velocity, using temperature probe 304 and pressure probe 305 to measure the temperature and pressure to correct for the sound wave velocity, thereby improving the accuracy of the measured position of the piston rod 400. A first seal 312 and a second seal 313 are installed on the outer wall of the first housing 301. The diameters of the first seal 312 and the second seal 313 are equal, ensuring that the first housing 301 experiences equal vertical pressure. The first housing 301 is in a state of force balance. Compared to the situation in existing sensor devices where force is concentrated on one side, the first housing 301 in this invention experiences less vibration, has higher reliability, avoids equipment damage, and extends the equipment's service life. This invention features a pressure relief channel 314 below the third mounting hole 311, allowing leaked liquid to flow out and preventing pressure buildup. An anti-rotation plate 316 is engaged with the first housing 301, preventing rotation of the first housing 301 and ensuring probe functionality. The anti-rotation plate 316 is also connected to the first housing 301 via a fastener, facilitating disassembly of the first housing 301. A through hole 323 is provided, connecting the second housing 321 and the anti-rotation plate 316. Workers can remove the first housing 301, second housing 321, and anti-rotation plate 316 from the cylinder bottom 200 by inserting a tool such as a screw into the through hole 323, with the screw contacting the surface of the cylinder bottom 200 near the anti-rotation plate 316, and by rotating the tool. This process is time-saving and labor-saving.

[0060] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A hydraulic cylinder, characterized in that, It includes a cylinder body and a piston rod disposed within the cylinder body, one end of the piston rod extending out of the cylinder body, and the other end of the piston rod dividing the inner cavity of the cylinder body into a rodless cavity and a rod cavity; A sensor device is provided on the cylinder body near the rodless cavity. The sensor device includes a radar probe, which is positioned along the axial direction of the piston rod. A radar through hole is provided on the cylinder body along its axial direction to cooperate with the radar probe, and the radar through hole communicates with the rodless cavity.

2. The hydraulic cylinder according to claim 1, characterized in that, The sensor device also includes a temperature probe, a pressure probe, and a ranging circuit board, wherein the temperature probe, the pressure probe, and the radar probe are all connected to the ranging circuit board.

3. The hydraulic cylinder according to claim 2, characterized in that, The cylinder body includes a cylinder barrel and a cylinder bottom located at one end of the cylinder barrel. The sensor device is installed radially on the cylinder bottom. The sensor device includes a first housing located inside the cylinder bottom and a second housing located outside the cylinder bottom. The radar probe, temperature probe, and pressure probe are installed in the first housing, and the ranging circuit board is installed in the second housing. The radar wave passage is provided at one end of the cylinder bottom near the cylinder barrel.

4. The hydraulic cylinder according to claim 3, characterized in that, A first mounting hole is provided on the side of the first housing near the radar wave pass, and the first mounting hole communicates with the radar wave pass. A pressure-isolating plate is installed on the first mounting hole, and the radar probe is installed on the side of the pressure-isolating plate away from the radar wave pass. The temperature probe is installed on the inner wall of the first housing. A second mounting hole for installing the pressure probe is also provided on the first housing, and the second mounting hole communicates with the rodless cavity.

5. The hydraulic cylinder according to claim 3, characterized in that, An anti-rotation structure is connected to the end of the first housing away from the cylinder bottom. The anti-rotation structure includes an anti-rotation plate, which is engaged with the first housing.

6. The hydraulic cylinder according to claim 5, characterized in that, The anti-rotation plate is also connected to the first housing via a fastener; the second housing is integrated with the anti-rotation plate, and a through hole is provided on the second housing and the anti-rotation plate.

7. The hydraulic cylinder according to claim 3, characterized in that, A third mounting hole is provided on the bottom of the cylinder, and the first housing is disposed in the third mounting hole. The third mounting hole communicates with the radar wave port. A first sealing element and a second sealing element are provided at the connection between the inner wall of the third mounting hole and the first housing. The first sealing element and the second sealing element are located on the radial sides of the radar wave port, and the diameters of the first sealing element and the second sealing element are equal.

8. The hydraulic cylinder according to claim 7, characterized in that, A pressure relief channel communicating with the third mounting hole is provided on the bottom of the cylinder.

9. The hydraulic cylinder according to claim 4, characterized in that, The pressure diaphragm is made of ceramic, polyetheretherketone, stainless steel, or carbon fiber.

10. The hydraulic cylinder according to claim 1, characterized in that, The axis of the radar wave aperture is perpendicular to the end face of the piston rod.

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