CN117386692A - Hydraulic cylinder - Google Patents

Abstract

The disclosure provides a pneumatic cylinder, including cylinder body subassembly, piston subassembly, position detection subassembly and pressure release subassembly, the cylinder body subassembly has the piston chamber that contains the medium, the piston subassembly slidable sets up in the piston chamber, the tip of cylinder body sets up the cylinder cap, position detection subassembly is in along radial setting in order to right in the cylinder cap the position of piston subassembly detects, pressure release subassembly sets up in order to be used for in the cylinder cap realize the pressure release when the medium in the piston chamber appears leaking. The embodiment of the disclosure can realize non-contact detection on the position of the piston in the hydraulic cylinder, has small influence on the strength of the piston, does not need to process the interior of the piston, and has the advantages of small space occupation, convenient disassembly and maintenance, low cost and the like.

Description

Hydraulic cylinder

Technical Field

The disclosure relates to the technical field of hydraulic equipment, in particular to a hydraulic cylinder.

Background

The hydraulic cylinder is a hydraulic actuating element which performs linear reciprocating motion through a piston so as to convert hydraulic energy into mechanical energy, and particularly drives the piston to perform linear motion along the inner wall of the hydraulic cylinder under the action of pressure difference between a rod cavity and a rodless cavity in the hydraulic cylinder. In the running process of the hydraulic cylinder, the position of the piston needs to be monitored in real time to obtain the working state of the hydraulic cylinder, when the position of the piston is detected by the hydraulic cylinder in the related art, the interior of the piston needs to be processed, and a displacement detection assembly for detecting the position of the piston by the hydraulic cylinder in the related art is inconvenient to disassemble and overhaul.

Disclosure of Invention

The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.

For this disclosed embodiment provides a pneumatic cylinder, including cylinder body subassembly, piston assembly, position detection subassembly and pressure release subassembly, the cylinder body subassembly has the piston chamber that contains the medium, the piston assembly slidable sets up in the piston chamber, the tip of cylinder body sets up the cylinder cap, position detection subassembly radially sets up in the cylinder cap in order to right the position of piston assembly detects, pressure release subassembly sets up in the cylinder cap in order to be used for realize the pressure release when the medium in the piston chamber appears leaking.

In some embodiments, an assembly hole is formed in the cylinder cover, the assembly hole is formed in the cylinder body in the radial direction, a position detection hole is formed in the inner surface, facing the piston head, of the cylinder cover, the position detection hole is communicated with the assembly hole, and the position detection assembly is detachably arranged in the assembly hole and detects the position of the piston assembly through the position detection hole.

In some embodiments, the extending direction of the position detecting hole and the extending direction of the fitting hole are perpendicular to each other, and the axis of the position detecting hole coincides with the axis of the cylinder.

In some embodiments, the depth of the mounting hole is greater than the radius of the cylinder block, 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.

In some embodiments, the position detection assembly detects the position of the piston assembly by ultrasonic or millimeter wave or laser pulse means.

In some embodiments, the position detection assembly includes a sensor housing having an outer surface in sealing engagement with an inner wall of the mounting hole and a sensor cell disposed within the sensor housing opposite the aperture of the position detection hole.

In some embodiments, the position detection assembly further includes a wire, one end of the wire is connected to the sensor cell, and the other end of the wire extends to an outside of the assembly hole to transmit signal data acquired by the sensor cell.

In some embodiments, the sensor housing is a cylindrical structure, a mounting recess is provided in the sensor housing, and an opening direction of the mounting recess faces an aperture direction of the assembly hole so that the sensor cell can be inserted and assembled into the sensor housing from the opening direction of the mounting recess.

In some embodiments, a positioning sleeve is disposed in the assembly hole, one end of the positioning sleeve is abutted against the upper end of the sensor housing, and the outer wall of the positioning sleeve is provided with threads, which are disposed on the inner wall of the assembly hole in a threaded fit manner.

In some embodiments, a first sinking groove is formed in the side surface of the cylinder cover, the orifice of the assembly hole is formed in the first sinking groove, a fixing plate is arranged at the bottom of the first sinking groove, and the fixing plate is connected with the bottom of the first sinking groove and presses against the positioning sleeve to enable the position detection assembly to be arranged in the assembly hole.

In some embodiments, the position detection assembly further comprises a cover cap disposed within the first sink and covering the aperture of the mounting hole.

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

In some embodiments, the side of the cylinder cover is provided with a second countersink, the assembly hole is arranged in the second countersink, and the sensor housing further comprises an annular flange connected with the bottom of the second countersink.

In some embodiments, the position detection assembly further comprises a cover cap disposed within the second sink and covering the aperture of the mounting hole.

In some embodiments, a first seal ring and a second seal ring are disposed on the outer peripheral side of the sensor housing, the first seal ring and the second seal ring being sealed between the outer surface of the sensor housing and the inner wall of the assembly hole, the first seal ring and the second seal ring being disposed at intervals along the axial direction of the sensor housing such that the position detection hole is located between the first seal ring and the second seal ring.

In some embodiments, a limiting groove is formed in the inner wall of the assembly hole, the limiting groove is formed in the extending direction of the assembly hole, a positioning block is arranged on the outer surface of the sensor shell, and the positioning block is matched with the limiting groove to prevent the position detection assembly from rotating along the circumferential direction of the assembly hole.

In some embodiments, a flat groove is arranged on the outer surface of the sensor housing at a position opposite to the position detection hole, the groove bottom of the flat groove extends along the axial direction perpendicular to the cylinder body, and the flat groove is used for reducing the lens effect generated by the sensor housing.

In some embodiments, the sensor housing is made of any one of PEEK, polyurethane, nylon, and carbon fiber.

In some embodiments, the pressure relief assembly includes a pressure relief hole radially disposed in the cylinder head and in communication with the mounting hole and a pressure relief valve disposed in the pressure relief hole.

In some embodiments, the pressure relief hole is coaxially disposed with the mounting hole, and a section of the pressure relief hole adjacent to the mounting hole has a diameter smaller than the diameter of the mounting hole to form a limiting step at a transition position of the mounting hole and the pressure relief hole.

In some embodiments, a leak detection assembly is provided on the cylinder head for detecting whether a leak of medium within the cylinder has occurred.

In some embodiments, the leak detection assembly includes a leak detection bore and a leak sensor disposed within the leak detection bore, one end of the leak detection bore being in communication with the fitting bore or the pressure relief bore and the other end extending to an outside of the cylinder head.

In some embodiments, the cylinder body comprises a cylinder wall which is a cylindrical structure with two open ends, a first end of the cylinder wall is provided with the cylinder cover, a second end of the cylinder wall is provided with a sealing element, the piston cavity is formed by the cylinder wall, the cylinder cover and the sealing element, the piston assembly comprises a piston rod and a piston head, the piston head is slidably assembled in the piston cavity to realize reciprocating motion in the piston cavity, one end of the piston rod is connected with the piston head, and the other end of the piston rod penetrates out of the sealing element.

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

The embodiment of the disclosure can realize non-contact detection on the position of the piston in the hydraulic cylinder, has small influence on the strength of the piston, does not need to process the interior of the piston, and has the advantages of small space occupation, convenient disassembly and maintenance, low cost and the like.

Drawings

In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar components. The accompanying drawings illustrate various embodiments by way of example in general and not by way of limitation, and together with the description and claims serve to explain the disclosed embodiments. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive of the present apparatus or method. The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and do not constitute an undue limitation on the disclosure. In the drawings:

FIG. 1 is a schematic diagram of a hydraulic cylinder according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the structure of a head in a hydraulic cylinder according to an embodiment of the present disclosure;

FIG. 3 is a schematic illustration of the installation of a head in a hydraulic cylinder according to an embodiment of the disclosure;

FIG. 4 is a schematic view of a head in a hydraulic cylinder according to another embodiment of the present disclosure;

FIG. 5 is a schematic view of the installation of a head in a hydraulic cylinder according to another embodiment of the disclosure;

FIG. 6 is a schematic view of a head in a hydraulic cylinder according to yet another embodiment of the present disclosure;

fig. 7 is a schematic view of the installation of a head in a hydraulic cylinder according to yet another embodiment of the present disclosure.

Reference numerals:

1. a cylinder assembly; 11. a cylinder cover; 12. a cylinder wall; 13. a seal; 111. a fitting hole; 1111-a first sink; 1112-a second sink; 112. a position detection hole; 113. a leak detection hole; 114. a pressure relief hole; 115-a fixed plate; 2. a piston assembly; 21. a piston rod; 22. a piston head; 3. a position detection assembly; 31. a sensor cell; 32. a sensor housing; 321. a first seal ring; 322. a second seal ring; 323-flat grooves; 324-an annular flange; 33. positioning a sleeve; 331-an outer hexagonal flange; 34. wiring; 341-a connector lug; 35. a cover; 4. a leak detection assembly; 41. a leak sensor; 5. a pressure relief assembly; 51. and a pressure release valve.

Detailed Description

Specific embodiments of the disclosure are described in detail below with reference to the drawings, but are not limiting of the disclosure.

It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be taken as limiting, but merely as exemplification of the embodiments. Other modifications within the scope and spirit of this disclosure will occur to persons of ordinary skill in the art.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment, given as a non-limiting example, with reference to the accompanying drawings.

It should also be understood that, although the present disclosure has been described with reference to some specific examples, a person skilled in the art will certainly be able to achieve many other equivalent forms of the present disclosure, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.

The above and other aspects, features and advantages of the present disclosure will become more apparent in light of the following detailed description when taken in conjunction with the accompanying drawings.

Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely examples of the disclosure, which may be embodied in various forms. Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the disclosure in unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.

It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the foregoing figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the disclosure described herein may be capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The specification may use the word "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the disclosure.

The embodiment of the disclosure provides a hydraulic cylinder, as shown in fig. 1, 2 and 3, the hydraulic cylinder includes a cylinder assembly 1, a piston assembly 2, a position detecting assembly 3 and a pressure releasing assembly 5, in this embodiment, the cylinder assembly 1 is filled with a fluid medium, the piston assembly 2 performs a reciprocating motion in the cylinder assembly 1, the position detecting assembly 3 is used for detecting a position of the piston assembly 2, and the pressure releasing assembly 5 is used for implementing pressure release when the medium in the cylinder assembly 1 leaks so as to protect the position detecting assembly 3.

Specifically, the cylinder body 1 comprises a cylinder wall 12, the cylinder wall 12 is of a cylindrical structure with two open ends, a cylinder cover 11 is arranged at a first end of the cylinder wall 12, a sealing element 13 is arranged at a second end of the cylinder wall 12, and thus the cylinder cover 11 and the sealing element 13 are respectively assembled at two ends of the cylinder wall 12 in a sealing way, and a sealed piston cavity is formed inside the cylinder body 1 through the cylinder wall 12, the cylinder cover 12 and the sealing element 13. The piston chamber contains a medium with high light transmission property, wherein the medium can be pure water, or emulsion, hydraulic oil and other suitable mediums.

The piston assembly 2 comprises a piston rod 21 and a piston head 22, the piston head 22 being slidably fitted in the piston chamber to effect a reciprocating movement within the piston chamber, one end of the piston rod 22 being connected to the piston head 21 and the other end thereof projecting from the second end of the cylinder 1, in particular projecting from the seal 13 to ensure tightness of the piston chamber. In this embodiment, as shown in fig. 1, the cylinder 1 extends in the left-right direction and the piston chamber in the cylinder 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 sealingly fitted to the inner wall of the cylinder 1, the piston rod 21 is located on the right side of the piston head 22, and the piston rod 21 is fitted to the right end of the cylinder 1 so that the piston head 22 can reciprocate in the left-right direction with respect to the cylinder 1.

The piston chamber of the present embodiment is divided by the piston head 22 into a rod chamber and a rodless chamber, as shown in fig. 1, the rod chamber is located on the right side of the piston head 22, the rodless chamber is located on the left side of the piston head 22, and the hydraulic cylinder of the present embodiment drives the piston head 22 to reciprocate relative to the cylinder body 1 by a pressure difference between the rod chamber and the rodless chamber. The cylinder head 11 in the cylinder block 1 of the present embodiment is disposed at the left side of the rodless chamber to seal the left end of the rodless chamber.

The position detection assembly 3 in this embodiment is radially arranged within the body 1 of the hydraulic cylinder, in particular the position detection assembly 3 is radially arranged within the cylinder head 11 for dynamic detection of the position of the piston head 22 during the reciprocating movement of the piston head 22.

Specifically, the cylinder head 11 is provided therein with an assembly hole 111, wherein the assembly hole 111 is disposed along a radial direction of the cylinder block 1, and an orifice of the assembly hole 111 is located on a side surface of the cylinder head 11, wherein the radial direction is perpendicular to a moving direction of the piston head 22.

Further, a position detection hole 112 is provided on a surface of the cylinder head 11 facing the piston head 22, the position detection hole 112 being in communication with the fitting hole 111, wherein an extending direction of the position detection hole 112 and an extending direction of the fitting hole 111 are preferably perpendicular to each other, so that the position detection hole 112 can communicate the fitting hole 111 and the piston chamber. Further, it is preferable that the geometric axis of the position detection hole 112 herein coincides with the geometric axis of the cylinder 1.

In some embodiments, the distance between the assembly hole 111 and the end face of the cylinder cover 11 facing the piston head 22 is greater than a set threshold value, so as to improve the structural strength between the assembly hole 111 and the rodless cavity, and avoid damage to the cylinder cover 11 when the hydraulic cylinder is operated under high-pressure working conditions, so that the position detection assembly 3 can be protected when the hydraulic cylinder is operated under high-pressure working conditions.

In this embodiment, the fitting hole 111 has an inner cavity extending in the axial direction thereof, and the position detecting assembly 3 is detachably fitted in the inner cavity of the fitting hole 111, for example, may be inserted into the fitting hole 111 from a side of the cylinder head 11 and fixed in the fitting hole 111. The depth of the fitting hole 111 is larger than the radius of the cylinder 1 here so as to detect the position of the piston head 22 by the position detection assembly 3.

Further, the position detecting assembly 3 includes a sensor housing 32 and a sensor cell 31, where the sensor housing 32 is sleeved on the outer peripheral side of the sensor cell 31. When the position detecting assembly 3 is detachably fitted in the fitting hole 111, the outer surface of the sensor housing 32 is sealingly engaged with the inner wall of the fitting hole 111 to facilitate fixing the position detecting assembly 3 in the fitting hole 111. Preferably, an opening is provided at an end of the sensor housing 32 facing the hole of the assembly hole 111 for the sensor cell 31 to be assembled and disassembled into the sensor housing 32.

Further, the sensor cell 31 is disposed within the sensor housing 32 opposite the aperture of the position sensing bore 112, for example, may be disposed at a head end of the sensor housing 32 such that the sensor cell 31 can transmit and receive signals through the position sensing bore 112 to the piston head 22 to sense the position of the piston head 2.

As shown in fig. 2, the position detecting hole 112 is disposed between the mounting hole 111 and the rodless cavity to communicate the mounting hole 111 and the rodless cavity, the sensor cell 31 is disposed at the left end of the position detecting hole 112 when mounted in the mounting hole 111, the sensor cell 31 can emit a signal without contacting the piston head 22, and the emitted signal can pass through the position detecting hole 112 and the medium in the rodless cavity to reach the surface of the piston head 22, thereby realizing 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.

In consideration of the fact that the hydraulic cylinder is filled with a medium with high light transmittance, the position detecting assembly 3 can adopt a detecting mode corresponding to the medium in consideration of the specificity of the medium. For example, in pure water medium, the sensor cell 31 may be measured by ultrasonic wave, millimeter wave or laser pulse, and in emulsion, hydraulic oil medium, etc., may be measured by ultrasonic wave or millimeter wave.

In one embodiment, the sensor cell 31 measures the position of the piston head 22 relative to the cylinder 1 based on ultrasound waves, where the frequency of the applied ultrasound waves is greater than 20000Hz. Specifically, the sensor cell 31 includes an ultrasonic sensor unit, through which ultrasonic waves are emitted and received, and the distance between the piston head 22 and the cylinder head 11 is obtained by calculating the stroke of the ultrasonic waves, which is highly reliable and convenient for measurement.

Furthermore, in some embodiments, the sensor cell 31 may also measure the position of the piston head 22 relative to the cylinder 1 based on millimeter waves, where applicable at frequencies of 30-300GHz. Specifically, the sensor cell 31 includes a millimeter wave sensor part through which millimeter waves are transmitted and received, and the distance between the piston head 22 and the cylinder head 11 is obtained by calculating the travel of the millimeter waves.

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 that emits and receives laser pulses, and calculates the distance between the piston head 22 and the cylinder head 11 by calculating the travel of the laser pulses.

In order to facilitate the installation of the sensor cell 31 in the sensor housing 32, the sensor housing 32 herein has a cylindrical structure, and the sensor housing 32 is provided therein with an installation recess having an opening direction toward the aperture direction of the fitting hole 111, so that the sensor cell 31 can be inserted from the opening direction of the installation recess and fitted into the sensor housing 32.

Further, in order to facilitate the sensor cell 31 to transmit and receive signals, the sensor housing 32 allows the signals emitted from 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, and preferably, the sensor housing 32 may be made of any one of PEEK material, polyurethane material, nylon material, and carbon fiber material. Here, for example, when a laser pulse is used, the sensor housing 32 may be made of a transparent material.

Further, the outer surface of the sensor housing 32 and the inner wall of the assembly hole 111 are in sealing fit, so that on one hand, the position detection hole 112 can be closed, thereby preventing the medium in the rodless cavity from entering the assembly hole 111, and on the other hand, the medium can be prevented from contacting the sensor cell 31 if entering the assembly hole 111 from the position detection hole 112, thereby affecting the operation of the sensor cell 31.

In some embodiments, as shown in fig. 2, a first seal ring 321 and a second seal ring 322 are disposed on the outer peripheral side of the sensor housing 32, the first seal ring 321 and the second seal ring 322 are sealed between the outer surface of the sensor housing 32 and the inner wall of the assembly hole 111, and the first seal ring 321 and the second seal ring 322 are spaced apart along the axial direction of the sensor housing 32 such that the position detection hole 112 is located between the first seal ring 321 and the second seal ring 322 to prevent leakage of a medium into the assembly hole 111 and the leakage hole 114 through the position detection hole 112.

In some embodiments, a limit groove may be further provided on an inner wall of the assembly hole 111, the limit groove is disposed along an extending direction of the assembly hole 111, a positioning block is provided on an outer surface of the sensor housing 32, and the position detecting assembly 3 is prevented from rotating along a circumferential direction of the assembly hole 111 by the positioning block being matched with the limit groove, so as to limit the position detecting assembly 3 in the circumferential direction.

In some embodiments, the sensor housing 32 is provided with a flat groove 323 on its outer surface, the groove bottom of the flat groove 323 extending in a direction perpendicular to the axial direction of the cylinder 1. Specifically, the flat groove 323 is disposed on the outer surface of the sensor housing 32 opposite to the position detection hole 112, and when the sensor cell 31 emits 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.

In order to facilitate the positioning of the position detecting assembly 3 in the assembly hole 111, in some embodiments, a positioning sleeve 33 is further disposed in the assembly hole 111, the position detecting assembly 3 is fixed in the assembly hole 111 by the positioning sleeve 33, here, the positioning sleeve 33 is disposed between the position detecting assembly 3 and the orifice of the assembly hole 111, and the outer wall of the positioning sleeve 33 is provided with threads, which may be disposed on the inner wall of the assembly hole 111 in a threaded fit manner, so as to be suitable for pressing the position detecting assembly 3 against the bottom of the assembly hole 111.

Further, a first sink 1111 is provided on the side of the cylinder head 11, the hole of the mounting hole 111 is provided in the first sink 1111, and a fixing plate 115 is provided at the bottom of the first sink 1111, for which purpose, when mounting, the position detecting assembly 3 may be first provided in the mounting hole 111, specifically, by rotating the positioning sleeve 33, the positioning sleeve 33 may be rotated and moved into the mounting hole 111 while pushing the position detecting assembly 3 against the bottom of the mounting hole 111, and then the fixing plate 115 may be pressed against the positioning sleeve 33 and fixed to the bottom of the first sink 1111, so that the position detecting assembly 3 may be pressed against the mounting hole 111 by the positioning sleeve 33, and finally the sensor cell 32 may be provided at a position opposite to the position detecting hole 12.

In the above embodiment, by adopting the positioning sleeve 33, a good self-locking performance can be achieved, and the positioning sleeve 33 is stopped between the position detecting component 3 and the orifice of the assembly hole 111 to fix a position, so that the position detecting component 3 and the bottom of the assembly hole 111 can be prevented from being separated, and the sensor cell 31 is prevented from deviating from a position opposite to the position detecting hole 112, which has the advantages of convenience in assembly and high stability.

In some embodiments, the position detecting assembly 3 further includes a wire 34, one end of the wire 34 is connected to the sensor cell 31, and the other end of the wire 34 extends to the outside of the assembly hole 111 to transmit signal data acquired by the sensor cell 31.

Further, the other end of the wiring 34 is provided with a connector 341, and the connector 341 is assembled on 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 circumferential side of the connector 341 is provided with a positioning boss, and the positioning boss can be matched into the positioning groove to prevent the connector 341 from rotating relative to the positioning sleeve 33.

Further, the position detecting assembly 3 further includes a cover 35, and the cover 35 is covered outside the hole of the assembly hole 111, and may be disposed in the first sink 1111. The cover 35 can protect the wiring 34 and the position detecting module 3 in the fitting hole 111.

In some embodiments, as shown in fig. 4 and 5, only a positioning sleeve is needed to be provided without providing a sink and a cover, wherein one end of the positioning sleeve 33 is stopped against the upper end of the sensor housing 32, the other end of the positioning sleeve 33 extends to the outer circumferential side of the cylinder cover 11 and is provided with an outer hexagonal flange 331, and the outer hexagonal flange 331 facilitates the mounting and dismounting of the positioning sleeve 33 on the cylinder cover 11 by a tool such as an inner hexagonal sleeve, so that the position detecting assembly 3 can be fixed by the positioning sleeve 35, and the positioning sleeve 33 can be stably fixed on the inner wall of the mounting opening 111. Here, the lower surface of the outer hexagonal flange 331 may be closely attached to the surface of the cylinder head 11, or may be spaced from the surface of the cylinder head 11.

In some embodiments, as shown in fig. 6 and 7, the positioning sleeve is not required in the present embodiment, and only the sensor housing 32 and the cover 35 are required to be matched, in particular, the side surface of the cylinder cover 11 is provided with a second countersink 1112, the inner diameter of the second countersink 1112 is larger than that of the assembly hole 111, the assembly hole 111 is arranged in the second countersink 1112, the sensor housing 32 further comprises an annular flange 324, when the sensor housing 32 is assembled in the assembly hole 111, the annular flange 324 is positioned on the outer peripheral side of the orifice of the assembly hole 111, particularly is assembled in the second countersink 1112, and the annular flange 324 is connected to the bottom of the second countersink 1112 through screw fastening so as to realize connection between the sensor housing 32 and the cylinder cover 11.

The cover 35 covers the outer side of the hole of the assembly hole 111, and may be disposed in the second countersink 1112. The cover 35 can protect the wiring 34 and the position detecting module 3 in the fitting hole 111.

Further, an annular gap is provided between the outer wall of the annular flange 324 and the inner wall of the second countersink 1112, at least a portion of the cover 35 may extend into the annular gap and be screwed with the annular flange 324, and at least a portion of the cover 35 extends to the outer circumferential side of the cylinder 1, so that the sensor housing 32 together with the sensor cell 31 is integrally taken out of the fitting hole 111 through the cover 35 screwed with the annular flange 324.

The hydraulic cylinder of the embodiment of the present disclosure further enables detection of the position of the piston head 22 by transmitting and receiving signals through the sensor cell 31 without contacting the piston head 22 to detect the distance between the piston head 22 and the sensor cell 31 by disposing the fitting hole 111 in the cylinder head 11 in the radial direction and fitting the position detection assembly 3 into the fitting hole 111.

Compared with the scheme of commonly adopting sensors such as magnetostrictive sensors in the related art, the position detection assembly 3 radially arranged in the cylinder cover 11 in the embodiment of the disclosure has the advantage of being convenient to detach and replace, on the other hand, the position detection assembly 3 detects the distance between the piston head 22 and the sensor cell 31 without contacting the piston head 22, so that the influence of position detection on the piston head 22 can be reduced, wherein the effective area of the piston head 22 is not influenced, and resistance is not generated on the movement of the piston head 22, so that the influence of the process of performing position detection on the piston head 22 on the movement of the piston assembly 2 is smaller.

Considering that the medium in the rodless cavity may enter the assembly hole 111 through the position detection hole 112, further, the pressure relief assembly 5 is disposed in the cylinder cover 11, where the pressure relief assembly 5 is configured to discharge the medium in the assembly hole 111 to the outside of the cylinder cover 11 when the pressure of the medium in the assembly hole 111 is too high, so as to realize pressure relief, thereby preventing the position detection assembly 3 from being damaged under the action of the high-pressure medium or preventing the position detection assembly 3 from being pulled out of the assembly hole 111, and improving the reliability of operation and stability of detection of the hydraulic cylinder.

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 disposed in the cylinder head 11 in a radial direction and is in communication with the fitting hole 111, and the pressure relief valve 51 is disposed in the pressure relief hole 114, wherein the pressure relief hole 114 may be disposed on a second side of the cylinder head 11 opposite to the fitting hole 111, such that one end of the pressure relief hole 114 is in communication with the fitting hole 111 and the other end thereof extends to the outside of the cylinder head 11.

After the medium in the rodless chamber leaks into the fitting hole 111, the relief valve 51 is adapted to open and discharge the medium in the fitting hole 111 after the medium pressure in the fitting hole 111 is greater than a set threshold value to protect the position detecting assembly 3 in the fitting hole 111. The relief valve 51 in this embodiment may be any one of a relief valve, and a one-way relief valve.

Further, the pressure relief hole 114 may be coaxially disposed with the mounting hole 111, and a section of the pressure relief hole near the mounting hole 111 has a diameter smaller than that of the mounting hole 111, so that a limiting step is formed at a transition position between the mounting hole 111 and the pressure relief hole 114, and the position detecting component 3 can be further limited in a radial direction by the limiting step, that is, when the sensor housing 32 is mounted, one end facing away from an orifice of the mounting hole 111 abuts against the step to realize radial limitation. The diameter of the portion of the pressure release hole 114 away from the fitting hole 111 may be larger than the diameter of the fitting hole 111 to facilitate the pressure release operation.

Further, the hydraulic cylinder of the embodiment of the disclosure further includes a leakage detection assembly 4, where the leakage detection assembly 4 is configured to detect whether the medium in the cylinder body 1 leaks, and in particular, to detect whether the medium in the rodless cavity leaks into the assembly hole 111, and send a signal indicating the leakage after the medium in the rodless cavity leaks into the assembly hole 111.

In some embodiments, the leak detection assembly 4 is disposed on the cylinder head 11, and includes a leak detection hole 113 and a leak sensor 41 disposed in the leak detection hole 113, wherein one end of the leak detection hole 113 is in communication with the fitting hole 111 or the pressure release hole 114, and the other end thereof extends to the outside of the cylinder head 11, and may be disposed on the outer surface of the cylinder head 11 and extends in the axial direction of the cylinder block 1.

The leakage sensor 41 is disposed in the leakage detecting hole 113 to detect whether the medium in the rodless cavity leaks into the assembling hole 111, wherein the leakage sensor 41 may be a humidity sensor, a pressure sensor, a temperature sensor, or the like. When the medium in the rodless cavity leaks into the assembly hole 111, the medium flows and fills the leakage detection hole 113, and the leakage sensor 41 can send a signal for prompting leakage after detecting that the leakage detection hole 113 contains the medium, so that maintenance personnel can detach and overhaul the hydraulic cylinder in time.

Further, one end of the leak detection hole 113 may be directly connected to the fitting hole 111, or as shown in fig. 2, one end of the leak detection hole 113 may be connected to the pressure release hole 114. Specifically, in view of the communication between the pressure release hole 114 and the fitting hole 111, for this purpose, the leak detection hole 113 communicates with the pressure release hole 114 and communicates with the fitting hole 111 through the pressure release hole 114, where since the end of the sensor housing 32 abuts against the limit step, the sensor housing 32 can be sealed and blocked between the fitting hole 111 and the pressure release hole 114 to avoid leakage of medium into the fitting hole 111 from the junction of the fitting hole 111 and the position detection hole 112.

The embodiment of the disclosure can realize non-contact detection on the position of the piston in the hydraulic cylinder, has small influence on the strength of the piston, does not need to process the interior of the piston, and has the advantages of small space occupation, convenient disassembly and maintenance, low cost and the like.

In the foregoing embodiments of the present disclosure, the descriptions of the various embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the disclosure.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The foregoing description of the preferred embodiments of the present disclosure is provided only and not intended to limit the disclosure so that various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims (24)

1. The utility model provides a pneumatic cylinder, its characterized in that includes cylinder body subassembly, piston subassembly, position detection subassembly and pressure release subassembly, the cylinder body subassembly has the piston chamber that contains the medium, the piston subassembly slidable sets up in the piston chamber, the tip of cylinder body sets up the cylinder cap, position detection subassembly radially sets up in order to right in the cylinder cap the position of piston subassembly detects, pressure release subassembly sets up in order to be used for when the medium in the piston chamber appears leaking realizes the pressure release in the cylinder cap.

2. The hydraulic cylinder according to claim 1, wherein an assembly hole is provided in the cylinder head, the assembly hole is provided in a radial direction of the cylinder body, a position detection hole is provided on an inner surface of the cylinder head toward the piston head, the position detection hole is in communication with the assembly hole, and the position detection assembly is detachably provided in the assembly hole and detects a position of the piston assembly through the position detection hole.

3. The hydraulic cylinder according to claim 2, wherein the extending direction of the position detection hole and the extending direction of the fitting hole are perpendicular to each other, and the axis of the position detection hole coincides with the axis of the cylinder body.

4. The hydraulic cylinder of claim 2, wherein the depth of the mounting hole is greater than a radius of the cylinder body, and a distance between the mounting hole and an inner surface of the cylinder head facing the piston assembly is greater than a set threshold.

5. The hydraulic cylinder according to claim 2, wherein the position detection assembly detects the position of the piston assembly by means of ultrasonic or millimeter wave or laser pulses.

6. The hydraulic cylinder of claim 2, wherein the position sensing assembly includes a sensor housing having an outer surface in sealing engagement with an inner wall of the mounting bore and a sensor cell disposed within the sensor housing opposite the aperture of the position sensing bore.

7. The hydraulic cylinder of claim 6, wherein the position sensing assembly further comprises a wire, one end of the wire is connected to the sensor cell, and the other end of the wire extends to an outside of the assembly hole to transmit signal data acquired by the sensor cell.

8. The hydraulic cylinder according to claim 6, wherein the sensor housing has a cylindrical structure, a mounting recess is provided in the sensor housing, and an opening direction of the mounting recess is directed toward an aperture direction of the fitting hole so that the sensor cell can be inserted from the opening direction of the mounting recess and fitted into the sensor housing.

9. The hydraulic cylinder according to claim 6, wherein a positioning sleeve is provided in the fitting hole, one end of the positioning sleeve is stopped against the upper end of the sensor housing, and an outer wall of the positioning sleeve is provided with threads, which are disposed on an inner wall of the fitting hole in a threaded fit manner.

10. The hydraulic cylinder according to claim 9, wherein a first sinking groove is provided on a side surface of the cylinder head, an orifice of the assembly hole is provided in the first sinking groove, a fixing plate is provided at a bottom of the first sinking groove, and the fixing plate is connected with the bottom of the first sinking groove and presses against the positioning sleeve to set the position detecting assembly in the assembly hole.

11. The hydraulic cylinder of claim 10, wherein the position sensing assembly further comprises a cover disposed within the first sink and covering the aperture of the mounting hole.

12. The hydraulic cylinder of claim 9, wherein the other end of the positioning sleeve is provided with an outer hexagonal flange.

13. The hydraulic cylinder according to claim 8, wherein the cylinder head is provided with a second countersink on a side surface thereof, the fitting hole is provided in the second countersink, and the sensor housing further includes an annular flange connected to a bottom of the second countersink.

14. The hydraulic cylinder of claim 13, wherein the position sensing assembly further comprises a cover disposed within the second sink and covering the aperture of the mounting hole.

15. The hydraulic cylinder according to claim 6, wherein a first seal ring and a second seal ring are provided on an outer peripheral side of the sensor housing, the first seal ring and the second seal ring being sealed between an outer surface of the sensor housing and an inner wall of the fitting hole, the first seal ring and the second seal ring being arranged at intervals in an axial direction of the sensor housing such that the position detection hole is located between the first seal ring and the second seal ring.

16. The hydraulic cylinder according to claim 6, wherein a limit groove is formed in an inner wall of the assembly hole, the limit groove is formed in an extending direction of the assembly hole, a positioning block is arranged on an outer surface of the sensor housing, and the positioning block is matched with the limit groove to prevent the position detection assembly from rotating along a circumferential direction of the assembly hole.

17. The hydraulic cylinder according to claim 6, wherein a flat groove is provided on an outer surface of the sensor housing at a position facing the position detection hole, a groove bottom of the flat groove extends in a direction perpendicular to an axial direction of the cylinder body, and the flat groove is used for reducing a lens effect generated by the sensor housing.

18. The hydraulic cylinder according to claim 6, wherein the sensor housing is made of any one of PEEK material, polyurethane material, nylon material, and carbon fiber material.

19. The hydraulic cylinder of claim 2, wherein the pressure relief assembly includes a pressure relief bore radially disposed within the head and in communication with the mounting bore and a pressure relief valve disposed within the pressure relief bore.

20. The hydraulic cylinder of claim 19, wherein the relief bore is coaxially disposed with the mounting bore and a section thereof adjacent the mounting bore has a diameter less than the diameter of the mounting bore to form a stop step at a transition location of the mounting bore and the relief bore.

21. The hydraulic cylinder according to claim 2, further comprising a leak detection assembly provided on the cylinder head for detecting whether or not a medium in the cylinder body leaks.

22. The hydraulic cylinder according to claim 21, wherein the leak detection assembly includes a leak detection hole and a leak sensor provided in the leak detection hole, one end of the leak detection hole being in communication with the fitting hole or the pressure release hole, and the other end thereof extending to an outside of the cylinder head.

23. The hydraulic cylinder of claim 22, wherein the cylinder body includes a cylinder wall having a cylindrical structure with both ends open, a first end of the cylinder wall being provided with the cylinder head, a second end of the cylinder wall being provided with a seal, the piston chamber being formed by the cylinder wall, the cylinder head and the seal, the piston assembly including a piston rod and a piston head slidably fitted in the piston chamber to effect a reciprocating motion within the piston chamber, one end of the piston rod being connected to the piston head, and the other end of the piston rod passing out of the seal.

24. Hydraulic cylinder according to any of claims 1-23, characterized in that the medium is water or an emulsion or hydraulic oil.