CN111425480A

CN111425480A - Hydraulic cylinder and mechanical equipment

Info

Publication number: CN111425480A
Application number: CN202010390732.1A
Authority: CN
Inventors: 曾斌; 谭贤文; 卢志学
Original assignee: Sany Automobile Manufacturing Co Ltd
Current assignee: Sany Automobile Manufacturing Co Ltd
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2020-07-17

Abstract

The invention provides a hydraulic cylinder and a mechanical device, wherein the mechanical device comprises: the cylinder body is internally provided with a cavity; the piston is arranged in the cavity, and the cylinder body and/or the piston are/is provided with a positioning part; the magnet is connected with the positioning part, an accommodating space is arranged between the magnet and the positioning part, and the accommodating space is communicated with the cavity. Through set up location portion and magnet in the cavity of pneumatic cylinder to set up accommodation space between location portion and magnet, make the pneumatic cylinder possess the function of metallic impurity in the filtering liquid medium, guarantee that metallic impurity in the liquid medium is adsorbed in accommodation space, thereby avoid the inner structure of liquid impurity fish tail pneumatic cylinder, solve the problem of pulling in the jar that the pneumatic cylinder exists, piston wearing and tearing. In addition, the hydraulic cylinder with the structure can also protect other structures in the hydraulic system from being damaged by metal impurities by filtering the metal impurities in the liquid medium, so that the reliability of the hydraulic system is improved.

Description

Hydraulic cylinder and mechanical equipment

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a hydraulic cylinder and mechanical equipment.

Background

In concrete machinery, the use environment of a hydraulic oil cylinder is severe, the load change borne by the hydraulic oil cylinder is complex, the hydraulic oil cylinder is seriously abraded, and iron metal impurities are generated; and because the working environment is poor, more impurities enter from the outside; frequent maintenance and easy introduction of impurities; when the hydraulic system is installed, impurities which are not cleaned up inside the hydraulic component exist. The impurities (mainly ferrous metal impurities) are dissociated in the hydraulic system and enter the matching surface of the piston and the inner wall of the cylinder barrel, so that the friction force between the piston and the cylinder barrel is increased, and the abrasion of the hydraulic oil cylinder is caused. Therefore, in the conventional use, the problems of pulling in the cylinder, abrasion of the piston and the like are easily caused in the hydraulic cylinder.

Therefore, how to design a hydraulic cylinder capable of solving the problem that metal impurities wear the internal structure of the hydraulic cylinder becomes a technical problem to be solved urgently.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

To this end, a first aspect of the invention provides a hydraulic cylinder.

A second aspect of the invention provides a mechanical device.

In view of this, a first aspect of the present invention provides a hydraulic cylinder including: the cylinder body is internally provided with a cavity; the piston is arranged in the cavity, and the cylinder body and/or the piston are/is provided with a positioning part; the magnet is arranged at the positioning part, between the magnet and the positioning part or on the positioning part, and the accommodating space is communicated with the cavity.

In the hydraulic cylinder provided by the invention, the hydraulic cylinder comprises a cylinder body, a piston and a magnet. The cylinder body is a main body frame of the hydraulic cylinder and is used for positioning and protecting other structures on the hydraulic cylinder, and a cavity is arranged in the cylinder body. The piston is a moving structure on the hydraulic cylinder, the piston is arranged in the cavity, and the piston moves relative to the cylinder body under the action of a liquid medium in the cavity during operation. On the basis, the cylinder body is further provided with a positioning part and a magnet, the positioning part is arranged on the inner surface of the cylinder body and/or the outer surface of the piston and is used for positioning and mounting the magnet, and the magnet and the positioning part are arranged at intervals so as to form an accommodating space communicated with the cavity between the magnet and the positioning part. In the working process, the liquid medium is filled into the cavity to drive the piston to move, and metal impurities in the liquid medium are adsorbed into the accommodating space between the magnet and the positioning part under the action of the magnet. Through set up location portion and magnet in the cavity of pneumatic cylinder to set up accommodation space between location portion and magnet, make the pneumatic cylinder possess the function of metallic impurity in the filtering liquid medium, guarantee that metallic impurity in the liquid medium is adsorbed in accommodation space, thereby avoid the inner structure of liquid impurity fish tail pneumatic cylinder, solve the problem of pulling in the jar that the pneumatic cylinder exists, piston wearing and tearing. In addition, the hydraulic cylinder with the structure can also protect other structures in the hydraulic system from being damaged by metal impurities by filtering the metal impurities in the liquid medium, so that the reliability of the hydraulic system is improved. And then realized, optimize the pneumatic cylinder structure, avoid metal impurity fish tail pneumatic cylinder, promote the operational reliability and the stability of pneumatic cylinder, extension pneumatic cylinder life's technical effect.

In addition, the hydraulic cylinder in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical scheme, further, the positioning portion is a positioning groove, the magnet is connected with the bottom surface of the positioning groove, and an accommodating space is formed between the magnet and the inner wall of the positioning groove; and/or a containing space is formed between one end of the magnet, which is far away from the bottom surface of the positioning groove, and the positioning groove.

In this technical scheme, specifically limited a location portion structure, location portion under this structure is the constant head tank, and the constant head tank is seted up on the internal wall of cavity and/or the surface of piston, and the magnet is connected with the bottom surface of constant head tank to install the magnet location on the constant head tank, wherein form accommodation space between the surface of magnet and the constant head tank, specifically, can be formed with accommodation space between the inner wall of magnet and constant head tank, and/or the magnet is kept away from and is formed with accommodation space between the face of seting up of constant head tank and the terminal surface of constant head tank. In the working process, after the liquid medium flows into the cavity, metal impurities doped in the liquid medium are adsorbed to the accommodating space between the positioning groove and the magnet by the magnet, so that the hydraulic cylinder is prevented from being scratched by the metal impurities. Through setting up location portion into the constant head tank, can simplify the structure of location portion on the one hand, reduce the processing degree of difficulty of location portion, on the other hand can make metal impurity concentrated in the constant head tank, avoids metal impurity to break away from the magnet under liquid medium's the flow effect. And then realized optimizing location portion structure, reduced the location portion processing degree of difficulty, promoted location portion to metallic impurity's adsorption efficiency, strengthened the technical effect of pneumatic cylinder job stabilization nature and reliability.

In any of the above technical solutions, further, the cavity includes a rodless cavity and a rod cavity, and positioning grooves are respectively formed on two end surfaces of the piston facing the rodless cavity and the rod cavity; wherein, the constant head tank is a plurality of, and on the cross-section of the axis of perpendicular to piston, a plurality of constant head tanks evenly distributed are on same circumference, and are located the constant head tank mutual interval setting on the different terminal surfaces.

In the technical scheme, the distribution mode of the positioning grooves on the piston is specifically limited. The cavity is divided into a rodless cavity and a rod cavity by the piston rod, the piston rod moves in the rod cavity, the positioning grooves are arranged on the piston and face two end faces of the rod cavity and the rodless cavity, and a plurality of positioning grooves are arranged on each end face. Wherein, a plurality of constant head tank evenly distributed on two terminal surfaces is on using the piston axis as same circumference of axle to the constant head tank dislocation set of two terminal surfaces. Through all setting up the constant head tank at two terminal surfaces of piston, can guarantee that the metallic impurity in the liquid medium at piston both ends all is filtered by the magnet, ensures metallic impurity's filter effect. Through with the constant head tank dislocation set on two terminal surfaces, can promote the degree of depth of seting up of constant head tank, avoid the constant head tank of both sides to run through the piston to promote the accommodation space volume between constant head tank and the magnet, promote accommodation space and to metallic impurity's the biggest capacity that receives. And then realize optimizing the structural distribution of constant head tank on the piston, promote the magnet on the piston to metallic impurity's filter effect, promote pneumatic cylinder job stabilization nature, extension pneumatic cylinder life's technological effect.

In any one of the above technical solutions, further, the positioning portion is a through hole, the through hole axially penetrates through the cylinder body, the magnet is arranged in the through hole in a penetrating manner, and the magnet and the inner wall of the through hole are arranged at intervals.

In the technical scheme, another positioning part structure is specifically limited, and the positioning parts under the structure are through holes which penetrate through the two ends of the cylinder body along the axial direction of the hydraulic cylinder. The magnet is arranged in the through hole in a penetrating mode, and the outer surface of the magnet and the inner wall surface of the through hole are arranged at intervals, so that an accommodating space is formed between the through hole and the magnet. In the working process, metal impurities in the liquid are sucked into the accommodating space under the action of the magnet, so that the metal impurities are filtered. By providing the positioning portion as a through hole, a user can penetrate the magnet into the through hole at one side of the through hole to complete the installation. Through setting up the both ends at the cylinder body with the through-hole, make the user can directly accomplish the location installation of magnet through inserting the magnet in to the through-hole under the condition of not opening the cavity to the dismouting process at cylinder body both ends has been removed from. And then realize optimizing location portion structure, reduce the magnet assembly difficulty and the metallic impurity clearance degree of difficulty, for the user brings the convenient condition, promote the technological effect that the user used and experienced.

In any one of the above technical solutions, further, the through hole is provided at an end of the cylinder body, the magnet is connected with an outer end surface of the cylinder body, and the hydraulic cylinder further includes: a first seal disposed between the magnet and the outer end face.

In the technical scheme, the through hole is further limited to be arranged at the end part of the cylinder body, and part of the magnet is buckled on the outer end face of the cylinder body and fixedly connected with the cylinder body, so that the positioning and installation of the magnet on the through hole are realized. Wherein, a first sealing element is arranged between the outer end surface of the cylinder body and the magnet, and the first sealing element can seal the gap between the end surface of the cylinder body and the magnet and avoid the leakage of the liquid medium from the gap. And then realize optimizing pneumatic cylinder structure, promote pneumatic cylinder job stabilization nature, prevent the technical effect that the liquid medium reveals.

Specifically, the magnet includes columnar work portion and the installation department that is connected with it, and the work portion wears to establish in the through-hole, and the installation department lock is on the outer terminal surface of cylinder body, and installation department shutoff through-hole. The mounting part is connected with the end surface of the cylinder body through a bolt.

In any one of the above technical solutions, further, the hydraulic cylinder further includes: a spacer disposed between the positioning portion and the magnet; wherein, the magnet and the positioning part are detachably connected through a bolt.

In this technical scheme, still be provided with the gasket on the pneumatic cylinder, the gasket sets up between location portion and magnet. Set up the gasket and can separate magnet and location portion, avoid the magnet contact and direct absorption can't remove on location portion. In the assembling process, the user can be convenient for install the magnet on the relative position of location portion on the one hand through setting up the gasket, and on the other hand can avoid metal impurity to fill in the connection gap of magnet and location portion. In the dismounting process, the adsorption force between the magnet and the positioning part can be reduced by arranging the gasket, so that a user can conveniently dismount the magnet. And then realized optimizing the connection structure between location portion and the magnet, reduced the magnet dismouting degree of difficulty, for the technical effect of user's convenient condition that provides. Wherein, the magnet is detachably connected with the positioning part through a bolt, thereby being convenient for dismounting the magnet and replacing the gasket.

Specifically, the gasket is the nonmetal gasket, and the nonmetal gasket can not receive the magnetic force effect of magnet, and the nonmetal gasket separates certain distance between with magnet and the location portion to reduce the adsorption affinity of magnet and location portion, reduce the magnet dismouting degree of difficulty.

In any of the above technical solutions, further, the cylinder block includes: the cylinder barrel is provided with a first connector and a second connector; the first end cover is buckled at one end of the cylinder barrel; and the second end cover is buckled at the other end of the cylinder barrel, and the positioning part is arranged on the first end cover and/or the second end cover.

In the technical scheme, the cylinder body comprises a cylinder barrel, a first end cover and a second end cover, the cylinder barrel is of a cylindrical structure with openings at two ends, the first end cover and the second end cover are buckled at two ends of the cylinder barrel respectively and seal the openings at two ends of the cylinder barrel, and therefore a cavity is enclosed by the cylinder barrel, the first end cover and the second end cover. The cylinder barrel is provided with a first connector and a second connector, and the first connector and the second connector are connected with a pipeline for transmitting liquid media. After the liquid medium enters the cavity from the first interface, the piston is pushed to move from the front end of the cylinder body to the rear end of the cylinder body, and after the liquid medium enters the cavity from the second interface, the piston is pushed to move from the rear end of the cylinder body to the front end of the cylinder body, so that the telescopic work of the hydraulic cylinder is realized. Through setting up the cylinder body into this split type structure of cylinder, first end cover and second end cover, can reduce the processing degree of difficulty of cylinder body on the one hand, on the other hand can convenience of customers maintain the magnet and clear up the metallic impurity who accumulates in the accommodation space through dismantling first end cover and second end cover. And then realize optimizing cylinder body structure, reduce cylinder barrel production degree of difficulty and manufacturing cost, maintain the technical effect of the condition of facilitating for the user.

In any one of the above technical solutions, further, an insertion hole is formed in the first end cap, a first seal groove and a first guide groove are formed in an inner surface of the insertion hole, and the hydraulic cylinder further includes: the piston rod is arranged on the insertion hole in a penetrating mode and connected with the piston; the second sealing element is arranged in the first sealing groove; the first guide piece is arranged in the first guide groove; wherein, the piston rod is connected with the piston through the screw thread, or the piston rod is connected with the piston through the bolt.

In this solution, the working structure on the hydraulic cylinder is further defined. The central position of the first end cover is provided with an insertion hole, and the piston rod penetrates into the cavity through the insertion hole and is connected with the piston. In the working process, the liquid medium pushes the piston to reciprocate in the cavity, and the moving piston drives the piston rod to move together so as to complete the telescopic motion of the piston rod on the hydraulic cylinder, so that the driving of a structure connected with the hydraulic cylinder is realized. On this basis, the internal surface of patchhole is seted up first seal groove and first guide way, and first seal groove is two, and in the axial direction of pneumatic cylinder, two first seal grooves distribute in the both sides of first guide way. Wherein install the second sealing member in the first seal groove, can seal the gap between patchhole and the piston rod through setting up the second sealing member to form double seal on the piston rod, avoid liquid medium to run off in by the gap. The first guide piece is matched with the peripheral side face of the piston rod and used for limiting the movement direction of the piston rod, the piston rod is prevented from inclining in the movement process, and the transmission accuracy and reliability are guaranteed. And then realized optimizing pneumatic cylinder structure, promoted the technical effect of pneumatic cylinder transmission precision and reliability.

In any one of the above technical solutions, further, a second seal groove and a second guide groove are provided on a circumferential side surface of the piston, and the piston further includes: the third sealing element is arranged in the second sealing groove; and the second guide piece is arranged in the second guide groove.

In this technical scheme, second seal groove and second guide way have been seted up on the week side of piston, and the second seal groove is two, and in the axial direction of pneumatic cylinder, two second seal grooves distribute in the both sides of second guide way. And a third sealing element is arranged in the second sealing groove, and the third sealing element can seal a gap between the peripheral side surface of the piston and the inner surface of the cylinder barrel so as to form double sealing between the piston and the cylinder barrel and avoid the liquid medium from running off from the gap. The second guide piece is matched with the peripheral side face of the piston and used for limiting the motion direction of the piston, the piston is prevented from deflecting in the motion process, and the transmission accuracy and reliability are guaranteed. And then realized optimizing pneumatic cylinder structure, promoted the technical effect of pneumatic cylinder transmission precision and reliability.

According to a second aspect of the present invention, there is provided a mechanical apparatus comprising: the hydraulic cylinder in any one of the above technical solutions.

In this technical solution, a mechanical device is defined to which the hydraulic cylinder in any one of the above technical solutions is applied, and the mechanical device has the advantages of the hydraulic cylinder in any one of the above technical solutions, and details are not described here.

Specifically, the mechanical equipment can be a concrete pump truck, a telescopic boom is arranged on the concrete pump truck, a pipeline for pumping concrete is arranged on the telescopic boom, when the concrete is required to be pumped to a high place, the telescopic boom is extended, and after the pumping work is finished, the telescopic boom is shortened and reset. The hydraulic cylinder is arranged on the telescopic arm support and used for driving the telescopic arm support to extend or contract. In the process of the working of the liquid medium driving hydraulic cylinder, metal impurities in the liquid medium are intensively adsorbed in the accommodating space under the action of the magnet, so that the problems of pulling in the cylinder, piston abrasion and the like of the hydraulic cylinder are avoided, the driving stability and reliability of the hydraulic cylinder are improved, and the service life of the hydraulic cylinder is prolonged.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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

FIG. 2 is another schematic diagram of the hydraulic cylinder of the embodiment of FIG. 1;

FIG. 3 shows a schematic structural diagram of a piston according to an embodiment of the invention;

FIG. 4 shows another schematic construction of a piston according to an embodiment of the invention;

FIG. 5 shows a schematic block diagram of a hydraulic cylinder according to another embodiment of the present invention;

FIG. 6 is another schematic structural view of the hydraulic cylinder of the embodiment shown in FIG. 5;

FIG. 7 illustrates a schematic structural diagram of a hydraulic cylinder according to yet another embodiment of the present invention;

FIG. 8 is another schematic structural view of the hydraulic cylinder of the embodiment of FIG. 7;

FIG. 9 is a schematic diagram illustrating a hydraulic cylinder according to yet another embodiment of the present invention;

fig. 10 shows a schematic view of a hydraulic cylinder according to a further embodiment of the invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 10 is:

1 hydraulic cylinder, 10 cylinder bodies, 12 cylinder barrels, 122 first interfaces, 124 second interfaces, 14 first end covers, 16 second end covers, 20 pistons, 30 positioning parts, 32 positioning grooves, 34 through holes, 40 magnets, 50 first sealing parts, 60 gaskets, 70 piston rods, 80 second sealing parts, 82 third sealing parts, 84 first guiding parts, 86 second guiding parts and 90 installation tools.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A hydraulic cylinder 1 and a mechanical apparatus according to some embodiments of the present invention are described below with reference to fig. 1 to 10.

As shown in fig. 1 and 2, a first aspect embodiment of the present invention provides a hydraulic cylinder 1, where the hydraulic cylinder 1 includes: the cylinder body 10 is provided with a cavity inside; the piston 20 is arranged in the cavity, and the positioning part 30 is arranged on the cylinder body 10 and/or the piston 20; the magnet 40 is disposed at the positioning portion 30, between the magnet 40 and the positioning portion 30, or an accommodating space is disposed on the positioning portion 30, and the accommodating space is communicated with the cavity.

In this embodiment, the hydraulic cylinder 1 includes a cylinder body 10, a piston 20, and a magnet 40. The cylinder body 10 is a main body frame of the hydraulic cylinder 1 and is used for positioning and protecting other structures on the hydraulic cylinder 1, and a cavity is arranged in the cylinder body 10. The piston 20 is a moving structure on the hydraulic cylinder 1, the piston 20 is arranged in the cavity, and the piston 20 moves relative to the cylinder body 10 under the action of a liquid medium in the cavity in operation. On the basis, the cylinder 10 is further provided with a positioning part 30 and a magnet 40, the positioning part 30 is arranged on the inner surface of the cylinder 10 and/or the outer surface of the piston 20, the positioning part 30 is used for positioning and installing the magnet 40, wherein the magnet 40 is arranged at a distance from the positioning part 30 so as to form an accommodating space communicated with the cavity between the magnet 40 and the positioning part 30. In the working process, the liquid medium is filled into the cavity to drive the piston 20 to move, and the metal impurities in the liquid medium are adsorbed into the accommodating space between the magnet 40 and the positioning part 30 under the action of the magnet 40. Through set up location portion 30 and magnet 40 in the cavity of pneumatic cylinder 1 to set up accommodation space between location portion 30 and magnet 40, make pneumatic cylinder 1 possess the function of metal impurity in the filtration liquid medium, guarantee that the metal impurity in the liquid medium is adsorbed in accommodation space, thereby avoid the inner structure of liquid impurity fish tail pneumatic cylinder 1, solve the problem that the cylinder that pneumatic cylinder 1 exists was pulled in and is hindered, piston 20 wearing and tearing. In addition, the hydraulic cylinder 1 with the structure can also protect other structures in the hydraulic system from being damaged by metal impurities by filtering the metal impurities in the liquid medium, so that the reliability of the hydraulic system is improved. And then realized, optimize pneumatic cylinder 1 structure, avoid metal impurity fish tail pneumatic cylinder 1, promote the operational reliability and the stability of pneumatic cylinder 1, extension pneumatic cylinder 1 life's technical effect.

In an embodiment of the present invention, further, as shown in fig. 2 and 5, the positioning portion 30 is a positioning groove 32, the magnet 40 is connected to a bottom surface of the positioning groove 32, and a receiving space is formed between the magnet 40 and an inner wall of the positioning groove 32; and/or, a containing space is formed between one end of the magnet 40 far away from the bottom surface of the positioning groove 32 and the positioning groove 32.

In this embodiment, a structure of the positioning portion 30 is specifically defined, in which the positioning portion 30 is a positioning groove 32, the positioning groove 32 is formed on an inner wall surface of the cavity and/or an outer surface of the piston 20, and the magnet 40 is connected to a bottom surface of the positioning groove 32 to position and mount the magnet 40 on the positioning groove 32, wherein an accommodating space is formed between the outer surface of the magnet 40 and the positioning groove 32, specifically, an accommodating space may be formed between the magnet 40 and an inner wall of the positioning groove 32, and/or an accommodating space is formed between an end surface of the magnet 40 away from the bottom surface of the positioning groove 32 and an opening surface of the positioning groove 32. In the working process, after the liquid medium flows into the cavity, metal impurities doped in the liquid medium are adsorbed to the accommodating space between the positioning groove 32 and the magnet 40 by the magnet 40, so that the hydraulic cylinder 1 is prevented from being scratched by the metal impurities. Through setting up location portion 30 into constant head tank 32, can simplify location portion 30's structure on the one hand, reduce location portion 30's the processing degree of difficulty, on the other hand can make metallic impurity concentrated in constant head tank 32, avoids metallic impurity to break away from magnet 40 under liquid medium's the flow effect. And then realized optimizing location portion 30 structure, reduced the processing degree of difficulty of location portion 30, promoted location portion 30 to metallic impurity's adsorption efficiency, strengthened the technical effect of pneumatic cylinder 1 job stabilization nature and reliability.

In an embodiment of the present invention, further, the chamber bodies include a rodless chamber and a rod chamber, as shown in fig. 3 and 4, positioning grooves 32 are provided on both end surfaces of the piston 20 facing the rodless chamber and the rod chamber; wherein, the constant head tank 32 is a plurality of, and on the cross-section of the axis of perpendicular to piston 20, a plurality of constant head tanks 32 evenly distributed are on same circumference, and are located the mutual interval setting of constant head tank 32 on the different terminal surfaces.

In this embodiment, the distribution of the positioning slots 32 on the piston 20 is specifically defined. The cavity is divided into a rodless cavity and a rod cavity by the piston rod 70, the piston rod 70 moves in the rod cavity, the positioning grooves 32 are arranged on two end faces of the piston 20 facing the rod cavity and the rodless cavity, and each end face is provided with a plurality of positioning grooves 32. Wherein, a plurality of constant head tanks 32 on two terminal surfaces evenly distributed use the piston 20 axis as the same circumference of axle to the constant head tank 32 dislocation set of two terminal surfaces. Through all setting up constant head tank 32 at two terminal surfaces of piston 20, can guarantee that the metallic impurity in the liquid medium at piston 20 both ends all is filtered by magnet 40, ensures metallic impurity's filter effect. Through the constant head tank 32 dislocation set with on two terminal surfaces, can promote the degree of depth of seting up of constant head tank 32, avoid the constant head tank 32 of both sides to run through piston 20 to promote the accommodation space volume between constant head tank 32 and the magnet 40, promote accommodation space and to metallic impurity's the biggest receiving capacity. And then realize optimizing the structural distribution of constant head tank 32 on piston 20, promote the magnet 40 on the piston 20 to metallic impurity's filter effect, promote pneumatic cylinder 1 job stabilization nature, extension pneumatic cylinder 1 life's technical effect.

In an embodiment of the present invention, as shown in fig. 9 and 10, the positioning portion 30 is a through hole 34, the through hole 34 axially penetrates through the cylinder 10, the magnet 40 is disposed in the through hole 34, and the magnet 40 is spaced apart from an inner wall of the through hole 34.

In this embodiment, another structure of the positioning portion 30 is specifically defined, and the positioning portion 30 under the structure is that through holes 34 are penetratingly provided at both ends of the cylinder block 10 in the axial direction of the hydraulic cylinder 1. The magnet 40 is inserted into the through hole 34, and an outer surface of the magnet 40 and an inner wall surface of the through hole 34 are spaced apart to form an accommodating space between the through hole 34 and the magnet 40. In the working process, the metal impurities in the liquid are sucked into the accommodating space under the action of the magnet 40, so that the metal impurities are filtered. By providing the positioning part 30 as the through-hole 34, a user can penetrate the magnet 40 into the through-hole 34 at one side of the through-hole 34 to complete the installation. Through opening the through-hole 34 at the both ends of cylinder body 10, make the user can directly accomplish the location installation of magnet 40 through inserting magnet 40 into through-hole 34 under the condition of not opening the cavity to the dismouting process of the both ends of having saved cylinder body 10. And then realize optimizing location portion 30 structure, reduce magnet 40 assembly degree of difficulty and the metallic impurity clearance degree of difficulty, for the user brings the convenient condition, promote the technological effect that the user used and experienced.

In an embodiment of the present invention, further, as shown in fig. 9 and 10, a through hole 34 is provided at an end portion of the cylinder body 10, a magnet 40 is connected to an outer end surface of the cylinder body 10, and the hydraulic cylinder 1 further includes: a first seal 50, the first seal 50 being disposed between the magnet 40 and the outer end face.

In this embodiment, it is further defined that a through hole 34 is provided on the end of the cylinder 10, and a part of the magnet 40 is buckled on the outer end face of the cylinder 10 and fixedly connected with the cylinder 10, thereby realizing the positioning and installation of the magnet 40 on the through hole 34. Wherein a first sealing member 50 is arranged between the outer end face of the cylinder 10 and the magnet 40, the first sealing member 50 can seal the gap between the end face of the cylinder 10 and the magnet 40 to prevent the liquid medium from leaking from the gap. And then realize optimizing pneumatic cylinder 1 structure, promote the technical effect that pneumatic cylinder 1 job stabilization nature was revealed, the prevention liquid medium reveals.

Specifically, the magnet 40 includes a columnar working portion and a mounting portion connected thereto, the working portion is inserted into the through hole 34, the mounting portion is fastened to the outer end surface of the cylinder 10, and the mounting portion blocks the through hole 34. The mounting portion is connected to the end surface of the cylinder block 10 by a bolt.

In an embodiment of the present invention, further, as shown in fig. 2 and 6, the hydraulic cylinder 1 further includes: a spacer 60 provided between the positioning part 30 and the magnet 40; wherein, the magnet 40 and the positioning part 30 are detachably connected by a bolt.

In this embodiment, the hydraulic cylinder 1 is further provided with a spacer 60, and the spacer 60 is disposed between the positioning portion 30 and the magnet 40. The spacer 60 is provided to separate the magnet 40 from the position fixing part 30, so as to prevent the magnet 40 from contacting and directly adhering to the position fixing part 30 and being unable to move. In the assembling process, the spacer 60 is provided to facilitate the user to mount the magnet 40 at the opposite position of the positioning part 30, and prevent metal impurities from being filled in the connecting gap between the magnet 40 and the positioning part 30. In the detachment process, the attractive force between the magnet 40 and the positioning part 30 can be reduced by providing the spacer 60, so that the user can detach the magnet 40 more conveniently. And then realized optimizing the connection structure between location portion 30 and magnet 40, reduced the magnet 40 dismouting degree of difficulty, for the technical effect of user's convenient condition that provides. Wherein, the magnet 40 is detachably connected with the positioning part 30 through a bolt, thereby facilitating the disassembly and assembly of the magnet 40 and the replacement of the gasket 60.

Specifically, the gasket 60 is a non-metal gasket 60, the non-metal gasket 60 does not receive the magnetic force of the magnet 40, and the non-metal gasket 60 separates the magnet 40 and the positioning portion 30 by a certain distance, so that the adsorption force of the magnet 40 and the positioning portion 30 is reduced, and the difficulty in mounting and dismounting the magnet 40 is reduced.

In one embodiment of the present invention, further, as shown in fig. 2, the cylinder block 10 includes: the cylinder 12, the cylinder 12 is provided with a first interface 122 and a second interface 124; a first end cap 14 fastened to one end of the cylinder 12; the second end cap 16 is fastened to the other end of the cylinder 12, and the positioning portion 30 is disposed on the first end cap 14 and/or the second end cap 16.

In this embodiment, the cylinder 10 includes a cylinder 12, a first end cap 14 and a second end cap 16, the cylinder 12 is a cylindrical structure with two open ends, and the first end cap 14 and the second end cap 16 are respectively fastened to two ends of the cylinder 12 and close off the two open ends of the cylinder 12, so that a cavity is enclosed by the cylinder 12, the first end cap 14 and the second end cap 16. The cylinder 12 is provided with a first port 122 and a second port 124, and the first port 122 and the second port 124 are connected with a pipeline for transmitting liquid medium. After the liquid medium enters the cavity from the first port 122, the piston 20 is pushed to move from the front end of the cylinder 10 to the rear end of the cylinder 10, and after the liquid medium enters the cavity from the second port 124, the piston 20 is pushed to move from the rear end of the cylinder 10 to the front end of the cylinder 10, thereby realizing the telescopic operation of the hydraulic cylinder 1. By providing the cylinder 10 with the split structure of the cylinder 12, the first end cap 14 and the second end cap 16, on one hand, the processing difficulty of the cylinder 10 can be reduced, and on the other hand, the user can conveniently maintain the magnet 40 and clean the metal impurities accumulated in the accommodating space by detaching the first end cap 14 and the second end cap 16. Further, the technical effects of optimizing the structure of the cylinder body 10, reducing the production difficulty and the production cost of the cylinder barrel 12 and providing convenient conditions for a user to maintain the hydraulic cylinder 1 are achieved.

In an embodiment of the present invention, further, as shown in fig. 2, the first end cover 14 is provided with an insertion hole, and an inner surface of the insertion hole is provided with a first seal groove and a first guide groove, and the hydraulic cylinder 1 further includes: a piston rod 70, the piston rod 70 is arranged on the insertion hole in a penetrating way, and the piston rod 70 is connected with the piston 20; a second seal 80 disposed within the first seal groove; a first guide 84 disposed in the first guide groove; wherein the piston rod 70 is connected to the piston 20 by a thread, or the piston rod 70 is connected to the piston 20 by a bolt.

In this embodiment, the working structure on the hydraulic cylinder 1 is further defined. The first end cap 14 is provided at a central position thereof with an insertion hole through which the piston rod 70 is inserted into the chamber and coupled to the piston 20. In the working process, the liquid medium pushes the piston 20 to reciprocate in the cavity, and the moving piston 20 drives the piston rod 70 to move together, so that the telescopic motion of the piston rod 70 on the hydraulic cylinder 1 is completed, and the driving of a structure connected with the hydraulic cylinder 1 is realized. On this basis, the internal surface of patchhole is seted up first seal groove and first guide way, and first seal groove is two, and in the axial direction of pneumatic cylinder 1, two first seal grooves distribute in the both sides of first guide way. Wherein the first seal groove is provided with a second seal 80, and the gap between the insertion hole and the piston rod 70 can be sealed by arranging the second seal 80, so as to form double seal on the piston rod 70 and avoid the liquid medium from flowing out from the gap. The first guiding element 84 is engaged with the circumferential side surface of the piston rod 70 for limiting the moving direction of the piston rod 70, preventing the piston rod 70 from deflecting during the moving process, and ensuring the accuracy and reliability of the transmission. And then realized optimizing pneumatic cylinder 1 structure, promoted the technical effect of 1 transmission accuracy nature and reliability of pneumatic cylinder.

In an embodiment of the present invention, further, as shown in fig. 2, a second seal groove and a second guide groove are provided on a circumferential side surface of the piston 20, and the piston 20 further includes: a third seal 82 disposed within the second seal groove; and a second guide 86 disposed in the second guide groove.

In this embodiment, the circumferential side surface of the piston 20 is provided with two second seal grooves and two second guide grooves, and the two second seal grooves are distributed on two sides of the second guide groove in the axial direction of the hydraulic cylinder 1. Wherein, a third sealing element 82 is arranged in the second sealing groove, and the gap between the peripheral side surface of the piston 20 and the inner surface of the cylinder 12 can be sealed by arranging the third sealing element 82, so as to form double sealing between the piston 20 and the cylinder 12 and avoid the liquid medium from flowing out from the gap. The second guiding element 86 is matched with the peripheral side surface of the piston 20 and used for limiting the movement direction of the piston 20, so that the piston 20 is prevented from deflecting in the movement process, and the transmission accuracy and reliability are ensured. And then realized optimizing pneumatic cylinder 1 structure, promoted the technical effect of 1 transmission accuracy nature and reliability of pneumatic cylinder.

According to a second aspect of the present invention, there is provided a mechanical apparatus comprising: as in the hydraulic cylinder 1 of any of the above embodiments, the hydraulic cylinder 1 is connected to the telescopic boom, and the hydraulic cylinder 1 is configured to be suitable for driving the telescopic boom to extend or contract.

In this embodiment, a mechanical device using the hydraulic cylinder 1 in any of the above embodiments is defined, and the mechanical device has the advantages of the hydraulic cylinder 1 in any of the above embodiments, and details are not repeated here.

Specifically, the mechanical device 1 may be a concrete pump truck, the concrete pump truck is provided with a telescopic boom, the telescopic boom is provided with a pipeline for pumping concrete, when concrete is required to be pumped to a high place, the telescopic boom is extended, and after the pumping work is completed, the telescopic boom is shortened and reset. The hydraulic cylinder 1 is arranged on the telescopic arm support and used for driving the telescopic arm support to extend or contract. In the process of the working of the hydraulic cylinder 1 driven by the liquid medium, the metal impurities in the liquid medium are intensively adsorbed in the accommodating space under the action of the magnet 40, so that the problems of pulling in the cylinder, abrasion of the piston 20 and the like of the hydraulic cylinder 1 are avoided, the driving stability and reliability of the hydraulic cylinder 1 are further improved, and the service life of the hydraulic cylinder 1 is prolonged.

In a first embodiment of the invention, as shown in FIG. 1: the piston rod assembly comprises a piston rod 70, a second sealing element 80, a first end cover 14, a first guide element 84, another second sealing element 80, a cylinder barrel 12, an installation tool 90, a fastening bolt, a magnet 40, a third sealing element 82, a second guide element 86, a gasket 60, another third sealing element 82, a piston 20 and a second end cover 16.

The first end cover 14 and the cylinder barrel 12 are connected through flanges, threads, snap rings or welded connection, and the second end cover 16 and the cylinder barrel 12 are connected through flanges, threads, snap rings or welded connection.

The first end cap 14 is sealed from the piston rod 70 by the second seal 80 and another second seal 80 to prevent foreign objects from entering the hydraulic ram and to prevent hydraulic oil within the hydraulic ram from leaking. The first end cap 14 and the piston rod 70 are guided in terms of movement by the first guide 84.

The piston rod 70 and the piston 20 are connected together by means of a screw connection, a bolt connection, or the like.

The piston 20 and the cylinder 12 are sealed by a third sealing element 82 and another third sealing element 82, hydraulic oil in the hydraulic oil cylinder is prevented from leaking, and the piston 20 and the cylinder 12 are guided by the second guiding element 86 for movement.

As shown in fig. 2, positioning grooves 32 are formed on both end surfaces of the piston 20, and magnets 40 are placed such that the magnets 40 are lower than both end surfaces of the piston 20. The fastening bolt connects the magnet 40 and the gasket 60 with the piston 20, and the installation tool 90 is used for ensuring that the side surface of the magnet 40 is not contacted with the piston 20 when the magnet is installed, so that the installation is convenient. The mounting tool 90 needs to be removed after the magnet 40 is mounted.

The metal impurities dissociated in the hydraulic oil can be adsorbed due to the magnetic force of the magnet 40, and the magnet 40 is lower than both end surfaces of the piston 20, so that the adsorbed metal impurities are stored in the receiving space between the positioning groove 32 and the magnet 40. Through adsorbing metal impurities, the abrasion of the oil cylinder is reduced, and the service life of the oil cylinder is prolonged. And due to the function of the fastening bolt, the magnet 40 can be prevented from being separated from the piston 20, and the working effectiveness of the system is ensured.

Both sides of the piston 20 are drilled as shown in fig. 3 and 4, and are drilled in a staggered manner such that there is a sufficient depth of the dirt receiving groove under the limited width of the piston 20 and magnets 40 can be placed on both sides of the piston 20.

In a second embodiment of the invention, as shown in FIG. 5: the piston rod assembly comprises a piston rod 70, a second sealing element 80, a first end cover 14, a first guide element 84, another second sealing element 80, a cylinder barrel 12, an installation tool 90, a fastening bolt, a magnet 40, a third sealing element 82, a second guide element 86, a gasket 60, another third sealing element 82, a piston 20 and a second end cover 16.

As shown in fig. 6, a positioning groove 32 is formed in the inner end surface of the second end cap 16 for receiving the magnet 40, and the magnet 40 is lower than the inner end surface of the second end cap 16. The fastening bolts connect the magnet 40 and the spacer 60 with the second end cap 16. The mounting fixture 90 is used to ensure that the side surface of the magnet 40 does not contact the second end cap 16 during mounting, thereby facilitating mounting. The mounting tool 90 needs to be removed after the magnet 40 is mounted.

Due to the magnetic force of the magnet 40, metal impurities dissociated in the hydraulic oil can be adsorbed, and the magnet 40 is lower than the inner end surface of the second end cover 16, so that the adsorbed metal impurities are stored in the accommodating space between the positioning groove 32 of the second end cover 16 and the magnet 40. Through adsorbing metal impurities, the abrasion of the oil cylinder is reduced, and the service life of the oil cylinder is prolonged. And due to the function of the fastening bolt, the magnet 40 can be prevented from being separated from the piston 20, and the working effectiveness of the system is ensured.

In a third embodiment of the invention, as shown in FIG. 7: the piston rod assembly comprises a piston rod 70, a second sealing element 80, a first end cover 14, a first guide element 84, another second sealing element 80, a cylinder barrel 12, an installation tool 90, a fastening bolt, a magnet 40, a third sealing element 82, a second guide element 86, a gasket 60, another third sealing element 82, a piston 20 and a second end cover 16.

As shown in fig. 8, a positioning groove 32 is formed on the inner end surface of the first end cap 14, and a magnet 40 is placed, wherein the magnet 40 is lower than the inner end surface of the first end cap 14. The fastening bolts connect the magnet 40 and the spacer 60 with the first end cap 14. The installation tool 90 is used to ensure that the side surface of the magnet 40 is not in contact with the first end cover 14 when being installed, so that the installation is convenient. The mounting tool 90 needs to be removed after the magnet 40 is mounted.

Due to the magnetic force of the magnet 40, metal impurities dissociated in the hydraulic oil can be adsorbed, and the magnet 40 is lower than the inner end face of the first end cover 14, so that the adsorbed metal impurities are stored in the accommodating space between the positioning groove 32 of the first end cover 14 and the magnet 40. Through adsorbing metal impurities, the abrasion of the oil cylinder is reduced, and the service life of the oil cylinder is prolonged. And due to the function of the fastening bolt, the magnet 40 can be prevented from being separated from the piston 20, and the working effectiveness of the system is ensured. Meanwhile, only the magnet 40 needs to be disassembled, so that impurities absorbed in the oil cylinder can be cleaned, and the impurities are convenient to clean.

In a fourth embodiment of the invention, as shown in FIG. 9: comprising a piston rod 70, a second seal 80, a first end cap 14, a first guide 84, a further second seal 80, a cylinder tube 12, a fastening bolt, a magnet 40, a third seal 82, a second guide 86, a spacer 60, a further third seal 82, a piston 20, a second end cap 16, a first seal 50.

A through hole 34 is processed on the second end cover 16, a magnet 40 is installed on the second end cover 16 through a fastening bolt, and is contacted with liquid in the oil cylinder through the through hole 34 on the second end cover 16, so that iron chips in oil can be adsorbed. A gasket 60 and a first sealing element 50 are arranged between the magnet 40 and the second end cover 16, and the gasket 60 can reduce the magnetic force between the magnet 40 and the second end cover 16, so that the magnet 40 can be conveniently taken out; the first seal 50 prevents oil from leaking through the containment space of the magnet 40 and the second end cap 16. The magnet 40 and the through hole 34 of the second end cap 16 have a certain accommodation space, which serves as a dirt accommodating groove (for storing adsorbed iron filings) and facilitates the removal of the magnet 40. This structure only needs carry out the dismouting to magnet 40, can clear up the adsorbed iron fillings of magnet 40, need not dismantle whole hydro-cylinder, and impurity clearance is convenient.

In a fifth embodiment of the present invention, as shown in fig. 10: comprising a piston rod 70, a second seal 80, a first end cap 14, a first guide 84, a further second seal 80, a cylinder tube 12, a fastening bolt, a magnet 40, a third seal 82, a second guide 86, a spacer 60, a further third seal 82, a piston 20, a second end cap 16, a first seal 50.

A through hole 34 is processed on the first end cover 14, the magnet 40 is installed on the first end cover 14 through a fastening bolt and is contacted with liquid in the oil cylinder through the through hole 34 on the first end cover 14, and therefore scrap iron in oil can be adsorbed. A gasket 60 and a first sealing element 50 are arranged between the magnet 40 and the first end cover 14, and the gasket 60 can reduce the magnetic force between the magnet 40 and the first end cover 14, so that the magnet 40 can be conveniently taken out; the first seal 50 prevents oil from leaking through the accommodation space of the magnet 40 and the first end cap 14. The magnet 40 and the through hole 34 of the first end cap 14 have a certain accommodating space, which is used as a dirt accommodating groove (for storing adsorbed iron filings) and is convenient for taking out the magnet 40. This structure only needs carry out the dismouting to magnet 40, can clear up the adsorbed iron fillings of magnet 40, need not dismantle whole hydro-cylinder, and impurity clearance is convenient.

In any of the above embodiments, the hydraulic cylinder 1 provided by the present invention has the following advantages:

(1) simple structure, less cost increase and wide application. The invention has simple structure, and only needs to process the positioning groove 32 on the two end surfaces of the piston 20 or the inner end surfaces of the first end cover 14 and the second end cover 16 and place the magnet 40, thus having convenient processing. The overall strength of the hydraulic cylinder 1 is not influenced, and the cost is increased little; the connection mode and structure of the cylinder body 10, the first end cover 14 and the second end cover 16 of the hydraulic cylinder 1 are not particularly limited, the original structure of the hydraulic cylinder 1 is not required to be changed, and the hydraulic cylinder 1 is widely suitable for supporting legs, amplitude variation and pumping of concrete machinery.

(2) Reducing problems of in-cylinder pull and piston 20 wear. According to the invention, the magnet 40 is added to the piston 20 or the first end cover 14 and the second end cover 16 to adsorb ferrous metal impurities, and the dirt receiving grooves of the magnet 40 and the piston 20 or the first end cover 14 and the second end cover 16 reduce the ferrous metal impurities from entering the matching surface of the cylinder barrel 12 and the piston 20, so that the friction force between the cylinder barrel 12 and the piston 20 is reduced, the abrasion time of the piston 20 is delayed, the occurrence of strain in the cylinder is effectively prevented, and the service lives of the piston 20 and the cylinder barrel 12 are prolonged.

(3) Effectively controlling the oil pollution. The iron metal impurities generated by the friction between the piston 20 and the inner wall of the cylinder 10 are not mixed into the oil due to the adsorption effect of the magnet 40, so that the pollution of the oil is reduced, and the service life of the hydraulic system is prolonged.

(4) The installation and the disassembly are convenient, and the cleaning is convenient. The magnet 40 can be conveniently positioned and installed through the magnet 40 installation tool 90, the assembly is simple, the circumferential surface of the magnet 40 and the piston 20 or the first end cover 14 and the second end cover 16 are provided with accommodating spaces, and the spacer 60 is arranged between the magnet 40 and the piston 20 or between the magnet 40 and the first end cover 14 and between the magnet 40 and the second end cover 16, so that the magnetic force between the magnet 40 and the piston 20 or between the magnet 40 and the first end cover 14 and between the magnet 40 and the second end cover 16 is reduced, and the disassembly is convenient. The ferrous metal impurities adsorbed by the magnet 40 are stored in the accommodating space between the magnet 40 and the piston 20 or the positioning groove 32 of the first end cover 14 and the second end cover 16, and after the magnet 40 and the piston are disassembled, the impurities can be conveniently cleaned.

(5) Furthermore, the penetrating magnet 40 can be mounted on the second end cover 16 or the first end cover 14, and only the magnet 40 needs to be detached, so that impurities absorbed in the hydraulic cylinder 1 can be cleaned, and the impurities are convenient to clean.

In the present invention, the terms "mounting," "connecting," "fixing," and the like are used in a broad sense, for example, "connecting" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic cylinder (1), characterized by comprising:

the cylinder body (10), wherein a cavity is formed in the cylinder body (10);

the piston (20) is arranged in the cavity, and a positioning part (30) is arranged on the cylinder body (10) and/or the piston (20);

the magnet (40) is arranged at the positioning part (30), an accommodating space is arranged between the magnet (40) and the positioning part (30) or on the positioning part (30), and the accommodating space is communicated with the cavity.

2. Hydraulic cylinder (1) according to claim 1, characterized in that the positioning part (30) is a positioning slot (32), the magnet (40) being connected to the bottom surface of the positioning slot (32);

the magnet (40) and the inner wall of the positioning groove (32) form the accommodating space;

and/or the accommodating space is formed between one end of the magnet (40) far away from the bottom surface of the positioning groove (32) and the positioning groove (32).

3. Hydraulic cylinder (1) according to claim 2, characterized in that the chambers comprise a rodless chamber and a rod chamber, the positioning slot (32) being provided on both end faces of the piston (20) facing the rodless and rod chambers;

the positioning grooves (32) are a plurality of, the positioning grooves (32) are uniformly distributed on the same circumference on the cross section perpendicular to the axis of the piston (20), and the positioning grooves (32) on different end faces are arranged at intervals.

4. The hydraulic cylinder (1) according to claim 1, wherein the positioning portion (30) is a through hole (34), the through hole (34) axially penetrates through the cylinder body (10), the magnet (40) is arranged in the through hole (34) in a penetrating manner, and the magnet (40) is arranged at a distance from the inner wall of the through hole (34).

5. Hydraulic cylinder (1) according to claim 4, characterized in that the through hole (34) is provided at the end of the cylinder (10), the magnet (40) being connected with the outer end face of the cylinder (10), the hydraulic cylinder (1) further comprising:

a first seal (50), the first seal (50) disposed between the magnet (40) and the outer end face.

6. Hydraulic cylinder (1) according to claim 1, characterized by further comprising:

a spacer (60) provided between the positioning portion (30) and the magnet (40);

wherein the magnet (40) and the positioning part (30) are detachably connected through a bolt.

7. Hydraulic cylinder (1) according to claim 1, characterized in that the cylinder block (10) comprises:

the cylinder barrel (12), wherein a first connector (122) and a second connector (124) are arranged on the cylinder barrel (12);

a first end cap (14) fastened to one end of the cylinder (12);

the second end cover (16) is buckled at the other end of the cylinder barrel (12), and the positioning part (30) is arranged on the first end cover (14) and/or the second end cover (16).

8. Hydraulic cylinder (1) according to claim 7, characterized in that the first end cover (14) is provided with an insertion hole, the insertion hole being provided on its inner surface with a first sealing groove and a first guiding groove, the hydraulic cylinder (1) further comprising:

the piston rod (70), the said piston rod (70) is worn and set up on the said plug-in hole, the said piston rod (70) is connected with the said piston (20);

a second seal (80) disposed within the first seal groove;

a first guide member (84) disposed in the first guide groove;

wherein the piston rod (70) is connected with the piston (20) by a thread, or the piston rod (70) is connected with the piston (20) by a bolt.

9. Hydraulic cylinder (1) according to any of claims 1 to 8, characterized in that the piston (20) is provided with a second sealing groove and a second guiding groove on its peripheral side, the piston (20) cylinder (10) further comprising:

a third seal (82) disposed within the second seal groove;

a second guide (86) disposed within the second guide slot.

10. A mechanical device, comprising:

hydraulic cylinder (1) according to any one of claims 1 to 9.