CN212318433U - Hydraulic oil cylinder - Google Patents

Abstract

The utility model relates to a hydraulic cylinder belongs to hydraulic machinery technical field. The utility model comprises a limit retainer ring, a retainer ring support ring and a spiral retainer ring, which form a limit structure of the whole cylinder cover; the piston rod sealing element does not need to be provided with a sealing element groove, and can be directly arranged between the spiral retainer ring and the guide ring. The utility model provides a working condition such as the piston rod diameter is bigger, cylinder thickness is thinner, the clearance is smaller between cylinder and the piston rod under, can't design sealing member slot in the cylinder cap structure to can't carry out spacing and sealed problem to the hydro-cylinder inner chamber. The utility model discloses simple structure, the installation is convenient with the dismantlement, and the hydro-cylinder stable performance is reliable.

Description

Hydraulic oil cylinder

Technical Field

The utility model relates to a hydraulic cylinder belongs to hydraulic machinery technical field.

Background

The hydraulic oil cylinder is an important actuating mechanism in engineering machinery, and the main structure of the hydraulic oil cylinder comprises a cylinder barrel, a piston rod, a cylinder bottom, a cylinder cover and the like. The cylinder bottom and the cylinder cover are respectively arranged at two ends of the oil cylinder and form a closed oil cavity together with the cylinder barrel and the piston rod, the cylinder cover generally needs to play the roles of limiting and sealing, and the stability and the reliability of the design are the key for ensuring whether the oil cylinder and the actuating mechanism can effectively and safely operate. The conventional cylinder cover structure mainly comprises a screw connection, a threaded connection, a clamping key connection, a steel wire connection and the like. These structures generally require the sealing element to be assembled on the cylinder head or the cylinder barrel, and when the diameter of the piston rod is larger, or the wall thickness of the cylinder barrel of the oil cylinder is required to be thinner, or the clearance between the cylinder barrel and the piston rod is required to be smaller, the sealing element groove cannot be designed, for example, a multi-stage oil cylinder.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the utility model provides a hydraulic cylinder to solve the problem that the cylinder cap can't design the sealing member slot under above-mentioned limited situation, and can guarantee that the cylinder cap is spacing reliable, sealing performance is stable excellent, and the cylinder cap seal installation is dismantled conveniently.

The utility model provides a technical scheme that its technical problem adopted is: the hydraulic cylinder comprises a cylinder barrel, a piston rod assembly, a limiting retainer ring, a retainer ring support ring, a spiral retainer ring, a piston rod sealing element, a guide ring and a cylinder cover, wherein the cylinder cover is fixedly assembled at the end part of the cylinder barrel, the limiting retainer ring, the retainer ring support ring, the spiral retainer ring and the guide ring are all arranged in the cylinder barrel, the outer wall of the guide ring is matched with the inner wall of the cylinder barrel, the inner wall of the guide ring is matched with the piston rod assembly, the outer end of the guide ring is connected with the cylinder cover and axially limited by the cylinder cover, the inner wall of the cylinder barrel is provided with a first groove for clamping the limiting retainer ring and a second groove for clamping the spiral retainer ring, the limiting retainer ring is a ring-shaped element formed by splicing a plurality of arc-shaped unit components, the end face of the limiting retainer ring, which faces one side of the cylinder cover, the second end surface is tightly attached to a limiting ring on the piston rod assembly when the oil cylinder extends in place; the clamping ring support ring is arranged on one side of the first end face of the limiting clamping ring, the outer peripheral surface of the clamping ring support ring is matched with the inner wall of the cylinder barrel, and the inner diameter cylindrical surface is matched with the piston rod assembly; one end of the clamping ring support ring, which faces the limiting clamping ring, is provided with a support part, the outer peripheral surface of the support part is matched with the inner diameter cylindrical surface of the limiting clamping ring, and the limiting clamping ring is clamped and fixed in the first groove of the cylinder barrel; one end of the clamping ring support ring is connected with the limiting clamping ring, the other end of the clamping ring support ring is connected with the spiral retainer ring, the spiral retainer ring is arranged in the second groove of the cylinder barrel, and the limiting structure is formed by the limiting clamping ring, the clamping ring support ring and the spiral retainer ring; the piston rod sealing piece is arranged between the spiral retainer ring and the guide ring, the inner diameter circumferential surface of the piston rod sealing piece is matched with the piston rod assembly to form a first sealing surface, and the outer diameter circumferential surface of the piston rod sealing piece is matched with the inner wall of the cylinder barrel to form a second sealing surface.

Further, the method comprises the following steps: the cylinder barrel and the cylinder bottom are assembled through welding, flange connection or integral threaded connection.

Further, the method comprises the following steps: the section of the limiting clamping ring is rectangular; the limiting clamping ring is composed of three arc unit components with the same structure, tangent planes are arranged at two ends of the outer arc surface of each arc unit component, and the tangent planes enable the width of the cross section of each arc unit component to gradually increase in the direction from the end part to the middle part.

Further, the method comprises the following steps: the material of rand support ring is polyoxymethylene plastic, and the outer peripheral face of the supporting part arranged on the rand support ring is provided with a guide inclined plane or a guide arc surface at one end facing the limiting rand.

Further, the method comprises the following steps: and a sealing retainer ring is arranged between the outer end of the piston rod sealing element and the guide ring, and a sealing assembly is formed by the sealing retainer ring and the piston rod sealing element. The material of the sealing retainer ring is preferably nylon.

Further, the method comprises the following steps: the inner wall of the cylinder barrel is provided with a lead-in inclined surface at the end where the cylinder cover is assembled, and the lead-in inclined surface is used for assembling a piston rod sealing piece.

Further, the method comprises the following steps: the outer wall of the cylinder barrel is provided with an external thread surface at the end where the cylinder cover is assembled, and the cylinder cover is in threaded connection with the external thread surface of the cylinder barrel; the outer peripheral face of the cylinder cover is provided with stop screws, the axes of the stop screws are arranged along the radial direction of the cylinder barrel, and the tail ends of the stop screws abut against the outer wall of the cylinder barrel.

Further, the method comprises the following steps: the material of guide ring is aluminium bronze or tin bronze.

Further, the method comprises the following steps: the inner diameter surface of the cylinder cover is provided with a dustproof ring at the outer end position, and the dustproof ring is matched with the piston rod assembly to form a sealed dustproof structure.

Further, the method comprises the following steps: the cylinder barrel is a double-acting multi-stage cylinder barrel, or a double-acting single-stage cylinder barrel, or a single-acting multi-stage cylinder barrel, or a single-acting single-stage cylinder barrel.

The utility model has the advantages that: the limiting structure of the whole oil cylinder cover is formed by a limiting retainer ring, a retainer ring supporting ring and a spiral retainer ring; the piston rod sealing element does not need to be provided with a sealing element groove and can be directly arranged between the spiral retainer ring and the guide ring, so that the inner diameter circumferential surface of the piston rod sealing element is matched with the piston rod assembly to form a first sealing surface, and the outer diameter circumferential surface of the piston rod sealing element is matched with the inner wall of the cylinder barrel to form a second sealing surface. In a preferred embodiment, the piston rod sealing element, the sealing retainer ring, the guide ring, the stop screw, the cylinder cover and the dust ring jointly form a sealing and dust-proof structure of the whole cylinder cover. The utility model provides a working condition such as the piston rod diameter is bigger, cylinder thickness is thinner, the clearance is smaller between cylinder and the piston rod under, can't design sealing member slot in the cylinder cap structure to can't carry out spacing and sealed problem to the hydro-cylinder inner chamber. The utility model discloses simple structure, the installation is convenient with the dismantlement, and the hydro-cylinder stable performance is reliable.

Drawings

Fig. 1 is a half sectional view of the overall structure of the present invention applied to a multistage double-acting cylinder;

FIG. 2 is an enlarged partial schematic view of FIG. 1;

FIG. 3 is a front view of the arc-shaped unit members forming the retainer ring of the present invention;

FIG. 4 is a side view of the arcuate cell members forming the retainer ring of the present invention;

fig. 5 is a front view of the collar support ring of the present invention;

FIG. 6 is a cross-sectional view A-A of FIG. 5;

FIG. 7 is a schematic view of the cylinder structure of the present invention;

fig. 8 is a front view of the guide ring of the present invention;

FIG. 9 is a cross-sectional view B-B of FIG. 8;

FIG. 10 is a front view of the overall structure of the single stage double acting cylinder to which the present invention is applied;

fig. 11 is a cross-sectional view of the overall structure of the single-stage double-acting cylinder to which the present invention is applied;

reference numbers in the figures: the cylinder comprises a cylinder bottom 1, a cylinder barrel 2, a piston rod assembly 3, a limiting retainer ring 4, a retainer ring support ring 5, a spiral retainer ring 6, a piston rod sealing element 7, a sealing retainer ring 8, a guide ring 9, a stop screw 10, a cylinder cover 11, a dust ring 12, a tangent plane a, a first end face b, a second end face c, an outer peripheral face d of a support portion, an inner diameter cylindrical surface e, an outer peripheral face f of the retainer ring support ring, a first groove g, a second groove h, a cylindrical surface i, an external thread surface j and a leading-in inclined surface k.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

As shown in fig. 1 to 11, the utility model comprises a cylinder barrel 2, a piston rod assembly 3, a limiting retainer ring 4, a retainer ring support ring 5, a spiral retainer ring 6, a piston rod sealing element 7, a guide ring 9 and a cylinder cover 11, wherein the cylinder cover 11 is fixedly assembled at the end part of the cylinder barrel 2, the limiting retainer ring 4, the retainer ring support ring 5, the spiral retainer ring 6 and the guide ring 9 are all arranged in the cylinder barrel 2, the outer wall of the guide ring 9 is matched with the inner wall of the cylinder barrel 2, the inner wall is matched with the piston rod assembly 3, the outer end of the guide ring 9 is connected with the cylinder cover 11, and the axial; the inner wall of the cylinder barrel 2 is provided with a first groove g for clamping a limiting clamping ring 4 and a second groove h for clamping a spiral check ring 6, the limiting clamping ring 4 is a ring-shaped element formed by splicing a plurality of arc-shaped unit components, the end face of the limiting clamping ring 4, facing one side of the cylinder cover 11, is a first end face b, the end face of the limiting clamping ring 4, far away from one side of the cylinder cover 11, is a second end face c, the limiting clamping ring 4 is installed in the first groove g of the cylinder barrel 2, the first end face b is tightly attached to the side wall of the first groove g, and the second end face c is tightly attached to a limiting ring on the piston rod; the clamping ring support ring 5 is arranged on one side of the first end face b of the limiting clamping ring 4, the outer peripheral face f of the clamping ring support ring 5 is matched with the inner wall of the cylinder barrel 2, and the inner diameter cylindrical surface e is matched with the piston rod assembly 3; one end of the clamping ring support ring 5, which faces the limiting clamping ring 4, is a support part, the outer peripheral surface d of the support part is matched with the inner diameter cylindrical surface of the limiting clamping ring 4, and the limiting clamping ring 4 is clamped and fixed in the first groove g of the cylinder barrel 2; one end of the clamping ring support ring 5 is connected with the limiting clamping ring 4, the other end of the clamping ring support ring 5 is connected with the spiral retainer ring 6, the spiral retainer ring 6 is arranged in the second groove h of the cylinder barrel 2, and the limiting structure is formed by the limiting clamping ring 4, the clamping ring support ring 5 and the spiral retainer ring 6; the piston rod sealing piece 7 is arranged between the spiral retainer ring 6 and the guide ring 9, the inner diameter circumferential surface of the piston rod sealing piece 7 is matched with the piston rod component 3 to form a first sealing surface, and the outer diameter circumferential surface is matched with the inner wall of the cylinder barrel 2 to form a second sealing surface.

In specific implementation, the cylinder barrel 2 and the cylinder bottom 1 can be assembled through welding, flange connection or integral threaded connection. Spacing rand 4 designs for multistage formula structure, can install into the first slot g of cylinder 2 more conveniently in, and spacing rand 4 installation back is supported with rand support ring 5, carries on spacingly with spiral retainer ring 6 to rand support ring 5, ensures that rand support ring 5 targets in place with spacing rand 4 installation, and rand support ring 5 plays the effect to 3 direction of piston rod assembly simultaneously. The piston rod sealing member 7 forms a sealing cavity with the cylinder barrel 2 and the piston rod assembly 3. Preferably, a sealing collar 8 is arranged at a position between the outer end of the piston rod seal 7 and the guide ring 9, the sealing collar 8 and the piston rod seal 7 constituting a sealing assembly. The material of the gasket 8 is preferably nylon. The sealing collar 8 can provide a supporting effect for the piston rod seal 7 during pressure loading. The material of the guide ring 9 is preferably aluminum bronze or tin bronze, and the guide ring 9 guides the extension and retraction of the piston rod assembly 3 to avoid damage to the sealing element due to unbalance loading.

The assembly structure of the cylinder head 11 and the cylinder tube 2 is preferably as follows: the outer wall of the cylinder barrel 2 is provided with an external thread surface j at the end where the cylinder cover 11 is assembled, and the cylinder cover 11 is in threaded connection with the external thread surface j of the cylinder barrel 2; the outer peripheral surface of the cylinder cover 11 is provided with a stop screw 10, the axis of the stop screw 10 is arranged along the radial direction of the cylinder barrel 2, and the tail end of the stop screw 10 abuts against the outer wall of the cylinder barrel 2. The cylinder cover 11 is connected by external threads, so that the guide ring 9, the sealing retainer ring 8 and the piston rod sealing element 7 can be installed in place, and the whole sealing mechanism is protected. The designed stop screw 10 can play a role in stopping and preventing looseness, so that the whole structure is more stable and reliable. Preferably, the inner diameter surface of the cylinder head 11 is provided with a dust ring 12 at its outer end position, and the dust ring 12 cooperates with the piston rod assembly 3 to form a sealed dust-proof structure. The dust ring 12 designed on the cylinder cover 11 can remove dust and impurities outside the piston rod, and prevent the dust and impurities from entering the inside of the oil cylinder and damaging the cylinder body.

For a better limiting effect, the cross section of the limiting collar 4 is preferably designed to be rectangular. In order to make the structure simple and reliable and facilitate assembly, the limiting clamp ring 4 is composed of three arc-shaped unit components with the same structure, each arc-shaped unit component is provided with tangent planes a at two ends of the outer arc surface, and the tangent planes a make the section width (corresponding to the radial direction of the limiting clamp ring 4) of the arc-shaped unit components gradually increase in the direction from the end part to the middle part.

For the convenience of assembly, the collar support ring 5 is preferably made of polyoxymethylene plastic, and the outer peripheral surface d of the support portion provided on the collar support ring 5 is provided with a guide inclined surface or a guide arc surface at one end facing the retainer collar 4.

To facilitate the assembly of the piston rod seal 7, the inner wall of the cylinder tube 2 is provided with a lead-in chamfer k at the end where the cylinder head 11 is assembled.

The utility model provides a cylinder 2 is two effect multistage cylinder barrels, perhaps is two effect single stage cylinder barrels, perhaps is single effect multistage cylinder barrel, perhaps is single effect single stage cylinder barrel all can.

The following description will be given taking the application of the present invention to a multi-stage double-acting cylinder as an example, and the general structural diagram is shown in fig. 1 and fig. 2.

During oil cylinder assembly, the cylinder barrel 2 and the cylinder bottom 1 are assembled into a whole, then the piston rod assembly 3 is assembled into the cylinder barrel 2, then the limiting clamping ring 4 (with a rectangular cross section) cut into 3 sections is assembled into the first groove g of the cylinder barrel 2, then the clamping ring support ring 5 is pushed in, the inner hole of the limiting clamping ring 4 is guaranteed to be wedged into the support lip edge (the outer peripheral surface d of the support part) of the clamping ring support ring 5, the limiting clamping ring 4 is supported, then the spiral check ring 6 is installed into the second groove h of the cylinder barrel 2, and therefore the limiting clamping is carried out on the clamping ring support ring 5 and the limiting clamping ring 4. The limiting retainer ring 4, the retainer ring support ring 5 and the spiral retainer ring 6 jointly form a limiting structure of the whole oil cylinder.

The piston rod seal 7 and the sealing collar 8 are then mounted and pushed together with the guide ring 9. The cylinder cover 11 assembled with the dust ring 12 is screwed through threads, the guide ring 9, the sealing retainer ring 8 and the piston rod sealing element 7 are pushed into the cylinder barrel 2 together, and after the cylinder cover 11 is installed in place, the piston rod sealing element 7, the sealing retainer ring 8 and the guide ring 9 can be ensured to be installed in place. And finally, the cylinder cover 11 is braked and prevented from loosening by using a stop screw 10, so that the safety and reliability of the whole structure are ensured. The whole sealing structure, the cylinder barrel 2, the piston rod assembly 3 and the cylinder bottom 1 form a stable and reliable sealing oil cavity, and the safe and effective operation of the oil cylinder action is ensured. The distance between the piston rod assembly 3 and the limit retainer ring 4 limits the working stroke of the whole oil cylinder.

Fig. 3 and 4 are schematic structural diagrams of the limiting clamp ring 4 in the multi-stage double-acting oil cylinder. Before cutting, the limiting clamp ring 4 is processed according to the limiting size, the cross section of the limiting clamp ring is rectangular, then the limiting clamp ring is equally cut into 3 sections, each section is as shown in figures 3 and 4, two ends of the outer arc surface are provided with unique section a designs, and the limiting clamp ring can be conveniently installed in the first groove g of the cylinder barrel 2. After the limiting retainer ring 4 is arranged in the first groove g of the cylinder barrel 2, the first end face b is tightly attached to the side wall of the first groove g, so that a sufficient contact area with the cylinder barrel 2 is ensured; the second end surface c is tightly attached to the limiting ring on the piston rod assembly 3 when the oil cylinder extends in place, and the impact of the piston rod assembly 3 on the cylinder barrel 2 is reduced. The second end surface c has no specific matching requirement with the side wall of the first groove g, and only the limit retainer ring 4 is convenient to mount.

Fig. 5 and 6 are schematic structural views of the collar support ring 5 in the multi-stage double-acting cylinder. The material of rand support ring 5 is polyformaldehyde plastics generally, and the outer peripheral face f of rand support ring 5 cooperatees with the inner wall of cylinder 2, and internal diameter face e cooperatees with piston rod assembly 3, leads piston rod assembly 3's extension and retraction, has ensured the sealing performance and the life-span of piston rod sealing member 7 and sealing washer 8. The terminal surface of rand support ring 5 towards spacing rand 4 one side is provided with annular protruding, and the outer peripheral face d of supporting part cooperatees with the internal diameter face of cylinder of spacing rand 4, can block into spacing rand 4's hole after the installation, ensures that spacing rand 4's external diameter circumference face dies with the card of the first slot g bottom surface on the cylinder 2, prevents that spacing rand 4 from falling out inefficacy in the first slot g of cylinder 2.

Fig. 7 is a schematic structural view of the cylinder tube 2 in the multi-stage double-acting cylinder. The cylinder barrel 2 is mainly characterized in that a first groove g for installing the limiting retainer ring 4, a second groove h for installing the spiral retainer ring 6, a cylindrical surface i for forming a sealing surface with the piston rod sealing element 7 and the seal retainer ring 8, an external thread surface j for installing the cylinder cover 11 and a guide-in inclined surface k for conveniently assembling the piston rod sealing element 7 are processed. The distance between the first groove g and the second groove h must be matched with the width of the clamping ring support ring 5, so that after the spiral retainer ring 6 is installed, the lip edge surface (the outer peripheral surface d of the support part) of the clamping ring support ring 5 can clamp the inner hole of the limiting clamping ring 4. The distance between the second groove h and the small end of the lead-in inclined plane k needs to be matched with the piston rod sealing element 7, the sealing retainer ring 8 and the guide ring 9, so that the sealing element is ensured to be installed in place, and the cylindrical surface i of the inner wall of the cylinder barrel 2 cannot be damaged, so that sealing failure is avoided.

Fig. 8 and 9 are schematic structural views of the guide ring 9 in the multi-stage double-acting cylinder described above. The material of the guide ring 9 should generally be aluminum bronze or tin bronze, which not only plays a role in guiding the piston rod assembly 3 during extension and retraction, but also is an essential part for mounting the piston rod seal 7 and the seal retainer 8. When the piston rod sealing member 7 is assembled into the cylinder barrel 2, the friction force between the deformed piston rod sealing member 7 and the cylinder barrel 2 is very large, and in order to ensure the sealing member performance of the oil cylinder, the guide ring 9, the sealing retainer ring 8 and the piston rod sealing member 7 are assembled to a specified position slowly by screwing the end cover 11.

The structure can be also applied to hydraulic cylinder products such as a double-acting single-stage cylinder (see fig. 10 and 11), a single-acting multi-stage cylinder, a single-acting single-stage cylinder and the like, so that the use safety and reliability of the cylinder are ensured, the service life of the cylinder is prolonged, and the cleanliness and the operation effectiveness of a hydraulic system are ensured. The utility model discloses can extensively popularize and apply in hydraulic pressure machinery technical field.

Claims (10)

1. Hydraulic cylinder, including cylinder (2), piston rod assembly (3), piston rod sealing member (7), guide ring (9) and cylinder cap (11), cylinder cap (11) fixed mounting is in the tip of cylinder (2), guide ring (9) set up in cylinder (2), the outer wall of guide ring (9) cooperatees with the inner wall of cylinder (2), the inner wall cooperatees with piston rod assembly (3), the outer end and cylinder cap (11) of guide ring (9) meet, carry out axial spacing, its characterized in that through cylinder cap (11): the cylinder cover further comprises a limiting clamping ring (4), a clamping ring support ring (5) and a spiral check ring (6), wherein the limiting clamping ring (4), the clamping ring support ring (5) and the spiral check ring (6) are arranged in the cylinder barrel (2), the inner wall of the cylinder barrel (2) is provided with a first groove (g) used for clamping the limiting clamping ring (4) and a second groove (h) used for clamping the spiral check ring (6), the limiting clamping ring (4) is a ring-shaped member formed by splicing a plurality of arc-shaped unit members, the end face of one side of the limiting clamping ring (4) facing the cylinder cover (11) is a first end face (b), the end face of one side far away from the cylinder cover (11) is a second end face (c), and the limiting clamping ring (4) is arranged in the first groove, the first end surface (b) is tightly attached to the side wall of the first groove (g), and the second end surface (c) is tightly attached to a limiting ring on the piston rod assembly (3) when the oil cylinder extends to the right position; the clamping ring support ring (5) is arranged on one side of the first end face (b) of the limiting clamping ring (4), the outer peripheral face (f) of the clamping ring support ring (5) is matched with the inner wall of the cylinder barrel (2), and the inner diameter cylindrical surface (e) is matched with the piston rod assembly (3); one end of the clamping ring support ring (5) facing the limiting clamping ring (4) is a support part, the outer peripheral surface (d) of the support part is matched with the inner diameter cylindrical surface of the limiting clamping ring (4), and the limiting clamping ring (4) is clamped and fixed in the first groove (g) of the cylinder barrel (2); one end of the clamping ring support ring (5) is connected with the limiting clamping ring (4), the other end of the clamping ring support ring is connected with the spiral check ring (6), the spiral check ring (6) is arranged in the second groove (h) of the cylinder barrel (2), and the limiting structure is formed by the limiting clamping ring (4), the clamping ring support ring (5) and the spiral check ring (6) together; the piston rod sealing piece (7) is arranged between the spiral retainer ring (6) and the guide ring (9), the inner diameter circumferential surface of the piston rod sealing piece (7) is matched with the piston rod component (3) to form a first sealing surface, and the outer diameter circumferential surface is matched with the inner wall of the cylinder barrel (2) to form a second sealing surface.

2. The hydraulic ram of claim 1, wherein: the cylinder barrel (2) and the cylinder bottom (1) are assembled through welding, flange connection or integral threaded connection.

3. The hydraulic ram of claim 1, wherein: the section of the limiting clamping ring (4) is rectangular; the limiting clamping ring (4) is composed of three arc-shaped unit components with the same structure, tangent planes (a) are arranged at two ends of the outer arc surface of each arc-shaped unit component, and the tangent planes (a) enable the section width of each arc-shaped unit component to be gradually increased in the direction from the end part to the middle part.

4. The hydraulic ram of claim 1, wherein: the material of rand support ring (5) is polyoxymethylene plastic, and the outer peripheral face (d) of the support part arranged on the rand support ring (5) is provided with a guide inclined plane or a guide arc surface at one end facing the limiting rand (4).

5. The hydraulic ram of claim 1, wherein: a sealing retainer ring (8) is arranged between the outer end of the piston rod sealing element (7) and the guide ring (9), and a sealing assembly is formed by the sealing retainer ring (8) and the piston rod sealing element (7).

6. The hydraulic ram of claim 5, wherein: the material of the sealing retainer ring (8) is nylon.

7. The hydraulic ram of claim 1, wherein: the inner wall of the cylinder barrel (2) is provided with a leading-in inclined plane (k) at the end of assembling the cylinder cover (11), and the leading-in inclined plane (k) is used for assembling the piston rod sealing piece (7); the material of the guide ring (9) is aluminum bronze or tin bronze.

8. The hydraulic ram of claim 1, wherein: the outer wall of the cylinder barrel (2) is provided with an external thread surface (j) at the end where the cylinder cover (11) is assembled, and the cylinder cover (11) is in threaded connection with the external thread surface (j) of the cylinder barrel (2); the outer peripheral surface of the cylinder cover (11) is provided with stop screws (10), the axis of each stop screw (10) is arranged along the radial direction of the cylinder barrel (2), and the tail ends of the stop screws (10) abut against the outer wall of the cylinder barrel (2).

9. The hydraulic ram of claim 1, wherein: the inner diameter surface of the cylinder cover (11) is provided with a dustproof ring (12) at the outer end position, and the dustproof ring (12) is matched with the piston rod assembly (3) to form a sealing dustproof structure.

10. A hydraulic ram as claimed in any one of claims 1 to 9 wherein: the cylinder barrel (2) is a double-acting multi-stage cylinder barrel, or a double-acting single-stage cylinder barrel, or a single-acting multi-stage cylinder barrel, or a single-acting single-stage cylinder barrel.

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