A hydraulic cylinder

Abstract

This disclosure provides a hydraulic cylinder, including a cylinder body assembly, a piston assembly, a position detection assembly, and a pressure relief assembly. The cylinder body assembly has a piston chamber containing a medium. The piston assembly is slidably disposed within the piston chamber. A cylinder cover is disposed at the end of the cylinder body. The position detection assembly is radially disposed within the cylinder cover to detect the position of the piston assembly. The pressure relief assembly is disposed within the cylinder cover to relieve pressure when leakage occurs in the medium within the piston chamber. This disclosure enables non-contact detection of the piston position within the hydraulic cylinder, has minimal impact on piston strength, and eliminates the need for internal piston machining. It offers advantages such as small space occupation, ease of disassembly and maintenance, and low cost.

Description

Technical Field

[0001] This disclosure relates to the field of hydraulic equipment technology, and more specifically, to a hydraulic cylinder. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy by performing linear reciprocating motion of a piston. Specifically, it is driven by the pressure difference between the rod-side and rodless sides of the cylinder, which propels the piston to move linearly along the inner wall of the cylinder. During operation, the piston's position needs to be monitored in real time to obtain the cylinder's working status. However, current hydraulic cylinder technologies require internal machining of the piston to detect its position, and the displacement detection components used for piston position detection are not easily disassembled for maintenance. Summary of the Invention

[0003] This disclosure aims to at least partially address one of the technical problems in the related art.

[0004] Therefore, this disclosure provides a hydraulic cylinder, including a cylinder body assembly, a piston assembly, a position detection assembly, and a pressure relief assembly. The cylinder body assembly has a piston chamber containing a medium. The piston assembly is slidably disposed in the piston chamber. A cylinder cover is disposed at the end of the cylinder body. The position detection assembly is radially disposed in the cylinder cover to detect the position of the piston assembly. The pressure relief assembly is disposed in the cylinder cover to relieve pressure when the medium in the piston chamber leaks.

[0005] In some embodiments, an assembly hole is provided in the cylinder head, the assembly hole is arranged radially along the cylinder body, and a position detection hole is provided on the inner surface of the cylinder head facing the piston head. The position detection hole is connected to the assembly hole, and the position detection component is detachably disposed in the assembly hole and detects the position of the piston assembly through the position detection hole.

[0006] In some embodiments, the extending direction of the position detection hole is perpendicular to the extending direction of the assembly hole, and the axis of the position detection hole coincides with the axis of the cylinder block.

[0007] In some embodiments, the depth of the mounting hole is greater than the radius of the cylinder body, and the distance between the mounting hole and the inner surface of the cylinder head facing the piston assembly is greater than a set threshold.

[0008] In some embodiments, the position detection component detects the position of the piston assembly using ultrasonic waves, millimeter waves, or laser pulses.

[0009] In some embodiments, the position detection assembly includes a sensor housing and a sensor cell, wherein the outer surface of the sensor housing is sealed to the inner wall of the mounting hole, and the sensor cell is disposed inside the sensor housing and is disposed opposite to the opening of the position detection hole.

[0010] In some embodiments, the position detection assembly further includes a wiring connection, one end of which is connected to the sensor cell, and the other end of which extends to the outside of the mounting hole to transmit signal data acquired by the sensor cell.

[0011] In some embodiments, the sensor housing is a cylindrical structure, and a mounting recess is provided inside the sensor housing. The opening direction of the mounting recess faces the opening direction of the assembly hole so that the sensor cell can be inserted into and assembled into the sensor housing from the opening direction of the mounting recess.

[0012] In some embodiments, a positioning sleeve is provided in the assembly hole, one end of the positioning sleeve abuts against the upper end of the sensor housing, and the outer wall of the positioning sleeve is threaded, which is disposed on the inner wall of the assembly hole by means of thread engagement.

[0013] In some embodiments, a first recess is provided on the side of the cylinder head, the opening of the mounting hole is provided in the first recess, and a fixing plate is provided at the bottom of the first recess. The fixing plate is connected to the bottom of the first recess and presses against the positioning sleeve to place the position detection component in the mounting hole.

[0014] In some embodiments, the position detection component further includes a cover, which is disposed in the first sink and covers the opening of the assembly hole.

[0015] In some embodiments, the other end of the positioning sleeve is provided with an external hexagonal flange.

[0016] In some embodiments, the cylinder head has a second recessed groove on its side, the mounting hole is disposed in the second recessed groove, and the sensor housing further includes an annular flange connected to the bottom of the second recessed groove.

[0017] In some embodiments, the position detection component further includes a cover, which is disposed in the second sink and covers the opening of the assembly hole.

[0018] In some embodiments, a first sealing ring and a second sealing ring are provided on the outer peripheral side of the sensor housing. The first sealing ring and the second sealing ring are sealed between the outer surface of the sensor housing and the inner wall of the mounting hole. The first sealing ring and the second sealing ring are arranged axially spaced along the sensor housing such that the position detection hole is located between the first sealing ring and the second sealing ring.

[0019] In some embodiments, a limiting groove is provided on the inner wall of the assembly hole, the limiting groove is provided along the extension direction of the assembly hole, and a positioning block is provided on the outer surface of the sensor housing, the positioning block cooperates with the limiting groove to prevent the position detection component from rotating circumferentially along the assembly hole.

[0020] In some embodiments, a flat groove is provided on the outer surface of the sensor housing at the location of the position detection hole, and the bottom of the flat groove extends in an axial direction perpendicular to the cylinder body. The flat groove is used to reduce the lens effect generated by the sensor housing.

[0021] In some embodiments, the sensor housing is made of any one of the following materials: PEEK, polyurethane, nylon, and carbon fiber.

[0022] In some embodiments, the pressure relief assembly includes a pressure relief hole and a pressure relief valve. The pressure relief hole is radially disposed within the cylinder head and communicates with the mounting hole, and the pressure relief valve is disposed within the pressure relief hole.

[0023] In some embodiments, the pressure relief hole is coaxially arranged with the assembly hole, and the diameter of the portion of the hole near the assembly hole is smaller than the diameter of the assembly hole to form a limiting step at the transition position between the assembly hole and the pressure relief hole.

[0024] In some embodiments, a leak detection component is also included, which is disposed on the cylinder head and is used to detect whether a leak has occurred in the medium inside the cylinder.

[0025] In some embodiments, the leakage detection assembly includes a leakage detection hole and a leakage sensor disposed in the leakage detection hole, one end of the leakage detection hole being connected to the assembly hole or the pressure relief hole, and the other end extending to the outside of the cylinder head.

[0026] In some embodiments, the cylinder body includes a cylinder wall, which is a cylindrical structure open at both ends. A cylinder cover is disposed at a first end of the cylinder wall, and a seal is disposed at a second end of the cylinder wall. The piston chamber is formed by the cylinder wall, the cylinder cover, and the seal. The piston assembly includes a piston rod and a piston head. The piston head is slidably mounted in the piston chamber to achieve reciprocating motion within the piston chamber. One end of the piston rod is connected to the piston head, and the other end of the piston rod extends through the seal.

[0027] In some embodiments, the medium is water, an emulsion, or hydraulic oil.

[0028] The embodiments disclosed herein can achieve non-contact detection of the position of the piston inside the hydraulic cylinder, with minimal impact on the piston strength. Furthermore, no internal processing of the piston is required, resulting in advantages such as small space occupation, easy disassembly and maintenance, and low cost. Attached Figure Description

[0029] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and are used, together with the description and claims, to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method. The accompanying drawings, which are provided to further understand this disclosure and form part of this application, are used to explain the illustrative embodiments of this disclosure and do not constitute an undue limitation of this disclosure. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of a hydraulic cylinder according to an embodiment of the present disclosure;

[0031] Figure 2 This is a schematic diagram of the structure of the cylinder head in a hydraulic cylinder according to an embodiment of the present disclosure;

[0032] Figure 3 This is a schematic diagram of the installation of the cylinder head in a hydraulic cylinder according to an embodiment of the present disclosure;

[0033] Figure 4 This is a schematic diagram of the structure of the cylinder head in a hydraulic cylinder according to another embodiment of the present disclosure;

[0034] Figure 5 This is a schematic diagram of the installation of the cylinder head in a hydraulic cylinder according to another embodiment of the present disclosure;

[0035] Figure 6 This is a schematic diagram of the structure of the cylinder head in a hydraulic cylinder according to another embodiment of the present disclosure;

[0036] Figure 7 This is a schematic diagram of the installation of the cylinder head in a hydraulic cylinder according to another embodiment of the present disclosure.

[0037] Figure label:

[0038] 1. Cylinder block assembly; 11. Cylinder head; 12. Cylinder wall; 13. Seal; 111. Assembly hole; 1111-First recess; 1112-Second recess; 112. Position detection hole; 113. Leakage detection hole; 114. Pressure relief hole; 115-Fixing plate; 2. Piston assembly; 21. Piston rod; 22. Piston head; 3. Position detection assembly; 31. Sensor cell; 32. Sensor housing; 321. First sealing ring; 322. Second sealing ring; 323-Flat groove; 324-Annular flange; 33. Positioning sleeve; 331-External hexagonal flange; 34. Wiring; 341-Wire connector; 35. Cover; 4. Leakage detection assembly; 41. Leakage sensor; 5. Pressure relief assembly; 51. Pressure relief valve. Detailed Implementation

[0039] The specific embodiments of this disclosure will now be described in detail with reference to the accompanying drawings, but these are not intended to limit the scope of this disclosure.

[0040] It should be understood that various modifications can be made to the embodiments disclosed 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 disclosure will be apparent to those skilled in the art.

[0041] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0042] These and other features of this disclosure will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0043] It should also be understood that although this disclosure has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this disclosure, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0044] The above and other aspects, features and advantages of this disclosure will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0045] Specific embodiments of the present disclosure are described thereafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure and can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the present disclosure. Therefore, the specific structural and functional details disclosed 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 disclosure in a variety of substantially any suitable detailed structures.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in still another embodiment,” all of which may refer to one or more of the same or different embodiments according to this disclosure.

[0048] Embodiments of this disclosure provide a hydraulic cylinder, such as Figure 1 , Figure 2 as well as Figure 3 As shown, the hydraulic cylinder includes a cylinder body assembly 1, a piston assembly 2, a position detection assembly 3, and a pressure relief assembly 5. In this embodiment, the cylinder body assembly 1 is filled with a fluid medium, the piston assembly 2 reciprocates within the cylinder body assembly 1, the position detection assembly 3 is used to detect the position of the piston assembly 2, and the pressure relief assembly 5 is used to relieve pressure when the medium in the cylinder body assembly 1 leaks, thereby protecting the position detection assembly 3.

[0049] Specifically, the cylinder body 1 includes a cylinder wall 12, which is a cylindrical structure open at both ends. A cylinder cover 11 is provided at the first end of the cylinder wall 12, and a sealing element 13 is provided at the second end of the cylinder wall 12. The cylinder cover 11 and the sealing element 13 are respectively sealed and assembled at both ends of the cylinder wall 12, forming a sealed piston chamber inside the cylinder body 1 through the cylinder wall 12, cylinder cover 12, and sealing element 13. The piston chamber contains a medium with high light transmittance, such as pure water, or other suitable media such as emulsions and hydraulic oil.

[0050] The piston assembly 2 includes a piston rod 21 and a piston head 22. The piston head 22 is slidably mounted in the piston cavity to achieve reciprocating motion within the piston cavity. One end of the piston rod 22 is connected to the piston head 21, and the other end extends from the second end of the cylinder 1, particularly through the seal 13, to ensure the sealing of the piston cavity. In this embodiment, as... Figure 1 As shown, the cylinder body 1 extends in the left-right direction and the piston chamber inside the cylinder body 1 extends in the left-right direction. The piston head 22 extends in the left-right direction and the outer peripheral side of the piston head 22 is sealed and assembled with the inner wall of the cylinder body 1. The piston rod 21 is located on the right side of the piston head 22 and is assembled at the right end of the cylinder body 1 so that the piston head 22 can reciprocate relative to the cylinder body 1 in the left-right direction.

[0051] In this embodiment, the piston chamber is divided into a rod chamber and a rodless chamber by the piston head 22, such as... Figure 1 As shown, the rod chamber is located on the right side of the piston head 22, and the rodless chamber is located on the left side of the piston head 22. In this embodiment, the hydraulic cylinder drives the piston head 22 to reciprocate relative to the cylinder body 1 through the pressure difference between the rod chamber and the rodless chamber. In this embodiment, the cylinder cover 11 inside the cylinder body 1 is disposed on the left side of the rodless chamber to seal the left end of the rodless chamber.

[0052] In this embodiment, the position detection component 3 is radially disposed inside the cylinder body 1 of the hydraulic cylinder. Specifically, the position detection component 3 is radially disposed inside the cylinder cover 11, and is used to dynamically detect the position of the piston head 22 during the reciprocating motion of the piston head 22.

[0053] Specifically, the cylinder head 11 has an assembly hole 111, which is arranged radially along the cylinder body 1. The opening of the assembly hole 111 is located on the side of the cylinder head 11, and the radial direction is perpendicular to the moving direction of the piston head 22.

[0054] Furthermore, a position detection hole 112 is provided on the surface of the cylinder head 11 facing the piston head 22. The position detection hole 112 communicates with the assembly hole 111. Preferably, the extending direction of the position detection hole 112 is perpendicular to the extending direction of the assembly hole 111, so that the position detection hole 112 can connect the assembly hole 111 and the piston chamber. In addition, preferably, the geometric axis of the position detection hole 112 coincides with the geometric axis of the cylinder block 1.

[0055] In some embodiments, the distance between the mounting hole 111 and the end face of the cylinder head 11 facing the piston head 22 is greater than a set threshold to improve the structural strength between the mounting hole 111 and the rodless cavity, thereby preventing damage to the cylinder head 11 when the hydraulic cylinder is working under high pressure, and thus enabling the position detection component 3 to be protected when the hydraulic cylinder is working under high pressure.

[0056] In this embodiment, the mounting hole 111 has an inner cavity extending along its axial direction. The position detection component 3 is detachably mounted in the inner cavity of the mounting hole 111. For example, it can be inserted into the mounting hole 111 from one side of the cylinder head 11 and fixed in the mounting hole 111. Here, the depth of the mounting hole 111 is greater than the radius of the cylinder body 1, so as to facilitate the detection of the position of the piston head 22 by the position detection component 3.

[0057] Further, the position detection component 3 includes a sensor housing 32 and a sensor cell 31, wherein the sensor housing 32 is sleeved on the outer periphery of the sensor cell 31. When the position detection component 3 is detachably assembled into the mounting hole 111, the outer surface of the sensor housing 32 and the inner wall of the mounting hole 111 are sealed together to fix the position detection component 3 within the mounting hole 111. Preferably, the sensor housing 32 has an opening at one end facing the mounting hole 111 to allow the sensor cell 31 to be installed and removed within the sensor housing 32.

[0058] Furthermore, the sensor cell 31 is disposed inside the sensor housing 32 and is disposed opposite to the opening of the position detection hole 112. For example, it can be disposed at the head end of the sensor housing 32, so that the sensor cell 31 can transmit and receive signals to the piston head 22 through the position detection hole 112 to detect the position of the piston head 2.

[0059] like Figure 2As shown, the position detection hole 112 is located between the assembly hole 111 and the rodless cavity to connect the assembly hole 111 and the rodless cavity. When the sensor cell 31 is assembled in the assembly hole 111, it is located at the left end of the position detection hole 112. The sensor cell 31 can emit a signal without contacting the piston head 22. The emitted signal can pass through the position detection hole 112 and the medium in the rodless cavity to reach the surface of the piston head 22, thereby realizing the detection of the distance between the piston head 22 and the sensor cell 31, and finally obtaining the position information of the piston head 22.

[0060] It should be noted that, considering the hydraulic cylinder is filled with a highly transparent medium, and given the special nature of this medium, the position detection component 3 can employ a detection method corresponding to the medium. For example, in pure water, the sensor cell 31 can measure using ultrasonic waves, millimeter waves, or laser pulses; in emulsions, hydraulic oil, and other media, it can measure using ultrasonic waves or millimeter waves.

[0061] In one embodiment, the sensor cell 31 measures the position of the piston head 22 relative to the cylinder 1 based on ultrasonic waves, wherein the applicable ultrasonic wave frequency is greater than 20000Hz. Specifically, the sensor cell 31 includes an ultrasonic sensor component that emits and receives ultrasonic waves, and calculates the distance between the piston head 22 and the cylinder head 11 by measuring the travel of the ultrasonic waves. This measurement method is highly reliable and easy to perform.

[0062] Furthermore, in some embodiments, the sensor cell 31 can also measure the position of the piston head 22 relative to the cylinder 1 based on millimeter waves, where the applicable millimeter wave frequency is 30-300 GHz. Specifically, the sensor cell 31 includes a millimeter wave sensor component, which transmits and receives millimeter waves, and calculates the distance between the piston head 22 and the cylinder head 11 by measuring the stroke of the millimeter waves.

[0063] In some embodiments, the sensor cell 31 measures the position of the piston head 22 relative to the cylinder 1 based on laser pulses. Specifically, the sensor cell 31 includes a laser sensor component capable of emitting and receiving laser pulses, and calculates the distance between the piston head 22 and the cylinder head 11 by measuring the stroke of the laser pulses.

[0064] To facilitate the installation of the sensor cell 31 within the sensor housing 32, the sensor housing 32 is cylindrical in shape and has a mounting recess. The opening of the mounting recess faces the opening of the assembly hole 111, allowing the sensor cell 31 to be inserted into and assembled into the sensor housing 32 from the opening of the mounting recess.

[0065] Furthermore, to facilitate signal transmission and reception by the sensor cell 31, the sensor housing 32 allows the signal emitted by the sensor cell 31 to pass through the sensor housing 32 to measure the distance between the piston head 22 and the sensor cell 31. Preferably, the sensor housing 32 can be made of any one of PEEK, polyurethane, nylon, and carbon fiber materials. For example, when using laser pulses, the sensor housing 32 can be made of a transparent material.

[0066] Furthermore, the outer surface of the sensor housing 32 and the inner wall of the mounting hole 111 are sealed together. On the one hand, this can seal the position detection hole 112, thereby preventing the medium in the rodless cavity from entering the mounting hole 111. On the other hand, if the medium enters the mounting hole 111 from the position detection hole 112, it can prevent the medium from contacting the sensor cell 31 and thus affecting the operation of the sensor cell 31.

[0067] In some embodiments, such as Figure 2 As shown, a first sealing ring 321 and a second sealing ring 322 are provided on the outer periphery of the sensor housing 32. The first sealing ring 321 and the second sealing ring 322 seal between the outer surface of the sensor housing 32 and the inner wall of the assembly hole 111. The first sealing ring 321 and the second sealing ring 322 are arranged at intervals along the axial direction of the sensor housing 32, such that the position detection hole 112 is located between the first sealing ring 321 and the second sealing ring 322, so as to prevent the medium from leaking into the assembly hole 111 and the leakage hole 114 through the position detection hole 112.

[0068] In some embodiments, a limiting groove may be provided on the inner wall of the assembly hole 111. The limiting groove is provided along the extension direction of the assembly hole 111. A positioning block is provided on the outer surface of the sensor housing 32. The positioning block cooperates with the limiting groove to prevent the position detection component 3 from rotating circumferentially along the assembly hole 111, thereby achieving circumferential positioning of the position detection component 3.

[0069] In some embodiments, a flat groove 323 is provided on the outer surface of the sensor housing 32, and the bottom of the flat groove 323 extends along an axial direction perpendicular to the cylinder 1. Specifically, the flat groove 323 is disposed on the outer surface of the sensor housing 32 directly opposite the position detection hole 112. When the sensor cell 31 transmits a signal to the position detection hole 112 to detect the distance between the piston head 22 and the sensor cell 31, the flat groove 323 can reduce the lens effect generated by the cylindrical and transparent sensor housing 32, thereby improving the detection accuracy of the position of the piston head 22.

[0070] To facilitate the installation of the position detection component 3 within the assembly hole 111, in some embodiments, a positioning sleeve 33 is also provided within the assembly hole 111. The position detection component 3 is fixed within the assembly hole 111 via the positioning sleeve 33. Here, the positioning sleeve 33 is located between the position detection component 3 and the opening of the assembly hole 111. The outer wall of the positioning sleeve 33 is threaded, and it can be installed on the inner wall of the assembly hole 111 via a threaded engagement, so as to press the position detection component 3 against the bottom of the assembly hole 111.

[0071] Furthermore, a first recessed groove 1111 is provided on the side of the cylinder head 11, and the opening of the mounting hole 111 is located in the first recessed groove 1111. A fixing plate 115 is provided at the bottom of the first recessed groove 1111. Therefore, during installation, the position detection component 3 can be placed in the mounting hole 111 first. Specifically, by rotating the positioning sleeve 33, the positioning sleeve 33 is rotated and moved into the mounting hole 111, while pushing the position detection component 3 to the bottom of the mounting hole 111. Then, the fixing plate 115 presses against the positioning sleeve 33 and fixes it to the bottom of the first recessed groove 1111. Thus, the position detection component 3 can be pressed against the mounting hole 111 by the positioning sleeve 33, and finally, the sensor cell 32 can be placed at a position opposite to the position detection hole 12.

[0072] In the above embodiments, the positioning sleeve 33 can achieve good self-locking performance. By fixing the position between the position detection component 3 and the opening of the assembly hole 111, the positioning sleeve 33 can prevent the position detection component 3 from detaching from the bottom of the assembly hole 111, thereby preventing the sensor cell 31 from deviating from the position opposite to the position detection hole 112. It has the advantages of easy assembly and high stability.

[0073] In some embodiments, the position detection component 3 further includes a wiring 34, one end of which is connected to the sensor cell 31, and the other end of which extends to the outside of the mounting hole 111 to transmit signal data acquired by the sensor cell 31.

[0074] Furthermore, the other end of the wiring 34 is provided with a connector 341, which is fitted to the inner side of the positioning sleeve 33; the inner wall of the positioning sleeve 33 is provided with a positioning groove, and the outer periphery of the connector 341 is provided with a positioning boss, which can be fitted into the positioning groove to prevent the connector 341 from rotating relative to the positioning sleeve 33.

[0075] Furthermore, the position detection component 3 also includes a cover 35, which covers the outside of the opening of the assembly hole 111, and can be disposed within the first recess 1111. The cover 35 protects both the wiring 34 and the position detection component 3 within the assembly hole 111.

[0076] In some embodiments, such as Figure 4 and Figure 5 As shown, in this embodiment, only a positioning sleeve is needed, without the need for a countersunk groove and a cap. One end of the positioning sleeve 33 abuts against the upper end of the sensor housing 32, and the other end of the positioning sleeve 33 extends to the outer periphery of the cylinder head 11 and is provided with an external hexagonal flange 331. The external hexagonal flange 331 facilitates the installation and removal of the positioning sleeve 33 from the cylinder head 11 using tools such as an internal hexagonal sleeve. This not only allows the position detection component 3 to be fixed by the positioning sleeve 35, but also allows the positioning sleeve 33 to be stably fixed to the inner wall of the assembly port 111. Here, the lower surface of the external hexagonal flange 331 can be in close contact with the surface of the cylinder head 11, or a gap can be left between it and the surface of the cylinder head 11.

[0077] In some embodiments, such as Figure 6 and Figure 7 As shown, in this embodiment, no positioning sleeve is required; only the sensor housing 32 and the cover 35 are needed for cooperation. Specifically, the cylinder head 11 has a second recess 1112 on its side. The inner diameter of the second recess 1112 is larger than the mounting hole 111. The mounting hole 111 is located in the second recess 1112. The sensor housing 32 also includes an annular flange 324. When the sensor housing 32 is assembled in the mounting hole 111, the annular flange 324 is located on the outer periphery of the opening of the mounting hole 111, especially when assembled into the second recess 1112. The annular flange 324 is fastened to the bottom of the second recess 1112 by screws to connect the sensor housing 32 and the cylinder head 11.

[0078] The cover 35 is positioned over the outside of the opening of the assembly hole 111, and can be positioned within the second recess 1112. The cover 35 protects both the wiring 34 and the position detection component 3 within the assembly hole 111.

[0079] Furthermore, there is an annular gap between the outer wall of the annular flange 324 and the inner wall of the second sink 1112. At least a portion of the cover 35 can extend into the annular gap and be threadedly connected to the annular flange 324. At least a portion of the cover 35 extends to the outer periphery of the cylinder body 1 so that the sensor housing 32 together with the sensor cell 31 can be removed from the assembly hole 111 by means of the cover 35 threadedly connected to the annular flange 324.

[0080] The hydraulic cylinder of this embodiment of the present disclosure provides a mounting hole 111 radially inside the cylinder cover 11 and inserts the position detection component 3 into the mounting hole 111. Furthermore, the sensor cell 31 transmits and receives signals without contacting the piston head 22 to detect the distance between the piston head 22 and the sensor cell 31, thereby realizing the detection of the position of the piston head 22.

[0081] Compared to the commonly used magnetostrictive sensors and other sensors in related technologies, the position detection component 3 arranged radially inside the cylinder head 11 in this embodiment has the advantage of being easy to disassemble and replace. On the other hand, the position detection component 3 detects the distance between the piston head 22 and the sensor cell 31 without contacting the piston head 22, which can reduce the impact of position detection on the piston head 22. In this way, it will not affect the effective area of ​​the piston head 22, nor will it generate resistance to the movement of the piston head 22, so that the process of position detection of the piston head 22 has little impact on the movement of the piston assembly 2.

[0082] Considering that the medium in the rodless cavity may enter the assembly hole 111 through the position detection hole 112, the pressure relief component 5 is further disposed inside the cylinder head 11. The pressure relief component 5 is used to discharge the medium in the assembly hole 111 to the outside of the cylinder head 11 when the medium pressure in the assembly hole 111 is too high, thereby preventing the position detection component 3 from being damaged under the action of high pressure medium or preventing the position detection component 3 from being dislodged from the assembly hole 111, and improving the reliability of the hydraulic cylinder operation and the stability of detection.

[0083] In some embodiments, the pressure relief assembly 5 includes a pressure relief hole 114 and a pressure relief valve 51. The pressure relief hole 114 is radially disposed within the cylinder head 11 and communicates with the mounting hole 111. The pressure relief valve 51 is disposed within the pressure relief hole 114. The pressure relief hole 114 may be disposed on a second side of the cylinder head 11 opposite to the mounting hole 111, such that one end of the pressure relief hole 114 communicates with the mounting hole 111, and the other end extends to the outside of the cylinder head 11.

[0084] When the medium in the rodless chamber leaks into the assembly hole 111, the pressure relief valve 51 is adapted to open and discharge the medium in the assembly hole 111 after the medium pressure in the assembly hole 111 exceeds a set threshold, thereby protecting the position detection component 3 in the assembly hole 111. In this embodiment, the pressure relief valve 51 can be any one of an overflow valve, a safety valve, and a one-way pressure relief valve.

[0085] Furthermore, the pressure relief hole 114 can be coaxially arranged with the assembly hole 111, and the diameter of the section of the hole 114 near the assembly hole 111 is smaller than the diameter of the assembly hole 111. This forms a limiting step at the transition position between the assembly hole 111 and the pressure relief hole 114. The limiting step can also limit the position detection component 3 radially. That is, during installation, the end of the sensor housing 32 facing away from the opening of the assembly hole 111 can be abutted against the step to achieve radial limitation. The diameter of the portion of the pressure relief hole 114 away from the assembly hole 111 can be larger than the diameter of the assembly hole 111 to facilitate pressure relief operation.

[0086] Furthermore, the hydraulic cylinder in this embodiment of the present disclosure also includes a leakage detection component 4, which is used to detect whether the medium in the cylinder body 1 leaks, especially to detect whether the medium in the rodless cavity leaks into the assembly hole 111, and to issue a leakage warning signal after the medium in the rodless cavity leaks into the assembly hole 111.

[0087] In some embodiments, the leakage detection component 4 is disposed on the cylinder head 11, and includes a leakage detection hole 113 and a leakage sensor 41 disposed in the leakage detection hole 113. One end of the leakage detection hole 113 is connected to the assembly hole 111 or the pressure relief hole 114, and the other end extends to the outside of the cylinder head 11. In particular, it can be disposed on the outer surface of the cylinder head 11 and extend along the axial direction of the cylinder block 1.

[0088] The leakage sensor 41 is disposed within the leakage detection hole 113 to detect whether the medium in the rodless cavity leaks into the assembly hole 111. The leakage sensor 41 can be a humidity sensor, a pressure sensor, or a temperature sensor, etc. When the medium in the rodless cavity leaks into the assembly hole 111, the medium flows and fills the leakage detection hole 113. The leakage sensor 41 can issue a leakage warning signal upon detecting the presence of medium in the leakage detection hole 113, allowing maintenance personnel to promptly disassemble and repair the hydraulic cylinder.

[0089] Furthermore, one end of the leakage detection hole 113 can be directly connected to the assembly hole 111, or it can be as follows: Figure 2 As shown, one end of the leakage detection hole 113 is connected to the pressure relief hole 114. Specifically, considering the connection between the pressure relief hole 114 and the assembly hole 111, the leakage detection hole 113 is connected to the pressure relief hole 114 and then connected to the assembly hole 111 through the pressure relief hole 114. Here, since the end of the sensor housing 32 abuts against the limiting step, the sensor housing 32 can be sealed between the assembly hole 111 and the pressure relief hole 114 to prevent the medium from leaking from the connection between the assembly hole 111 and the position detection hole 112 into the assembly hole 111.

[0090] The embodiments disclosed herein can achieve non-contact detection of the position of the piston inside the hydraulic cylinder, with minimal impact on the piston strength. Furthermore, no internal processing of the piston is required, resulting in advantages such as small space occupation, easy disassembly and maintenance, and low cost.

[0091] In the above embodiments of this disclosure, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0092] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0093] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this disclosure.

[0094] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0095] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A hydraulic cylinder, characterized in that, The system includes a cylinder block assembly, a piston assembly, a position detection assembly, and a pressure relief assembly. The cylinder block assembly has a piston chamber containing a medium, and the piston assembly is slidably disposed within the piston chamber. A cylinder head is disposed at one end of the cylinder block. The position detection assembly is radially disposed within the cylinder head to detect the position of the piston assembly. The pressure relief assembly is disposed within the cylinder head to relieve pressure when leakage occurs in the medium within the piston chamber. The piston assembly includes a piston rod and a piston head. An assembly hole is disposed within the cylinder head, and the assembly hole is radially disposed within the cylinder block. A position detection hole is disposed on the inner surface of the cylinder head facing the piston head, and the position detection hole communicates with the assembly hole. The position detection assembly is detachably disposed within the assembly hole and detects the position of the piston assembly through the position detection hole. The extension direction of the position detection hole is perpendicular to the extension direction of the assembly hole, and the axis of the position detection hole coincides with the axis of the cylinder block. The position detection assembly includes a sensor housing and a sensor cell. The outer surface of the sensor housing is sealed to the inner wall of the mounting hole. The sensor cell is disposed inside the sensor housing and is positioned opposite to the opening of the position detection hole. The pressure relief assembly includes a pressure relief hole and a pressure relief valve. The pressure relief hole is radially disposed inside the cylinder head and communicates with the mounting hole. The pressure relief valve is disposed inside the pressure relief hole. The pressure relief hole is coaxially disposed with the mounting hole, and the diameter of the section of the pressure relief hole near the mounting hole is smaller than the diameter of the mounting hole to form a limiting step at the transition position between the mounting hole and the pressure relief hole. It also includes a leak detection component, which is disposed on the cylinder head and is used to detect whether the medium in the cylinder body is leaking; the leak detection component includes a leak detection hole and a leak sensor disposed in the leak detection hole, one end of the leak detection hole is connected to the assembly hole or the pressure relief hole, and the other end extends to the outside of the cylinder head.

2. The hydraulic cylinder according to claim 1, characterized in that, The depth of the mounting hole is greater than the radius of the cylinder body, and the distance between the mounting hole and the inner surface of the cylinder head facing the piston assembly is greater than a set threshold.

3. The hydraulic cylinder according to claim 1, characterized in that, The position detection component detects the position of the piston assembly using ultrasonic waves, millimeter waves, or laser pulses.

4. The hydraulic cylinder according to claim 1, characterized in that, The position detection assembly also includes a wiring, one end of which is connected to the sensor cell, and the other end of which extends to the outside of the mounting hole to transmit signal data acquired by the sensor cell.

5. The hydraulic cylinder according to claim 1, characterized in that, The sensor housing has a cylindrical structure and a mounting recess inside. The opening of the mounting recess faces the opening of the assembly hole so that the sensor cell can be inserted into and assembled into the sensor housing from the opening of the mounting recess.

6. The hydraulic cylinder according to claim 1, characterized in that, A positioning sleeve is provided inside the assembly hole. One end of the positioning sleeve abuts against the upper end of the sensor housing. The outer wall of the positioning sleeve is threaded and is set on the inner wall of the assembly hole through threaded engagement.

7. The hydraulic cylinder according to claim 6, characterized in that, The cylinder head has a first recessed groove on its side, the opening of the assembly hole is located in the first recessed groove, and a fixing plate is provided at the bottom of the first recessed groove. The fixing plate is connected to the bottom of the first recessed groove and presses against the positioning sleeve to place the position detection component in the assembly hole.

8. The hydraulic cylinder according to claim 7, characterized in that, The position detection component also includes a cover, which is disposed in the first sink and covers the opening of the assembly hole.

9. The hydraulic cylinder according to claim 6, characterized in that, The other end of the positioning sleeve is provided with an external hexagonal flange.

10. The hydraulic cylinder according to claim 5, characterized in that, The cylinder head has a second recessed groove on its side, and the mounting hole is located in the second recessed groove. The sensor housing also includes an annular flange, which is connected to the bottom of the second recessed groove.

11. The hydraulic cylinder according to claim 10, characterized in that, The position detection component also includes a cover, which is disposed in the second sink and covers the opening of the assembly hole.

12. The hydraulic cylinder according to claim 1, characterized in that, The outer periphery of the sensor housing is provided with a first sealing ring and a second sealing ring. The first sealing ring and the second sealing ring are sealed between the outer surface of the sensor housing and the inner wall of the assembly hole. The first sealing ring and the second sealing ring are arranged at intervals along the axial direction of the sensor housing, such that the position detection hole is located between the first sealing ring and the second sealing ring.

13. The hydraulic cylinder according to claim 1, characterized in that, A limiting groove is provided on the inner wall of the assembly hole, and the limiting groove is arranged along the extension direction of the assembly hole. A positioning block is provided on the outer surface of the sensor housing. The positioning block cooperates with the limiting groove to prevent the position detection component from rotating circumferentially along the assembly hole.

14. The hydraulic cylinder according to claim 1, characterized in that, A flat groove is provided on the outer surface of the sensor housing, directly opposite the position detection hole. The bottom of the flat groove extends along the axial direction perpendicular to the cylinder body. The flat groove is used to reduce the lens effect generated by the sensor housing.

15. The hydraulic cylinder according to claim 1, characterized in that, The sensor housing is made of any one of the following materials: PEEK, polyurethane, nylon, and carbon fiber.

16. The hydraulic cylinder according to claim 1, characterized in that, The cylinder body includes a cylinder wall, which is a cylindrical structure open at both ends. The cylinder cover is provided at the first end of the cylinder wall, and a seal is provided at the second end of the cylinder wall. The piston chamber is formed by the cylinder wall, the cylinder cover, and the seal. The piston head is slidably assembled in the piston chamber to achieve reciprocating motion within the piston chamber. One end of the piston rod is connected to the piston head, and the other end protrudes from the seal.

17. The hydraulic cylinder according to any one of claims 1-16, characterized in that, The medium is water, emulsion, or hydraulic oil.

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