CN215444576U

CN215444576U - Hydraulic pressure type pressure cylinder

Info

Publication number: CN215444576U
Application number: CN202120361601.0U
Authority: CN
Inventors: 陆炜达
Original assignee: Wuxi Boit Technology Co ltd
Current assignee: Wuxi Boit Technology Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2022-01-07
Anticipated expiration: 2031-02-07

Abstract

The utility model discloses a hydraulic pressure cylinder, which comprises a cylinder body, a lower end cover and an upper end cover, wherein the lower end cover and the upper end cover are arranged at two ends of the cylinder body, a columnar cavity is formed by enclosing the cylinder body, the lower end cover and the upper end cover, a piston rod penetrates through the upper end cover from top to bottom, the lower end of the piston rod extends into the cavity and is connected with a piston, the cavity is communicated with the outside of the cylinder body, the hydraulic pressure cylinder also comprises a piston cover plate connected to the upper part of the piston, the piston cover plate is connected with the piston to form an accommodating cavity, the piston rod comprises a rod body and a connecting part integrally connected to the lower end of the rod body, the rod body extends downwards to enter the accommodating cavity, and the connecting part can move in the accommodating cavity. According to the hydraulic pressure cylinder, the piston rod and the piston are connected in a split mode, and the centering relation between the piston rod and the piston is adjusted by adjusting the position of the connecting part in the accommodating cavity, so that the piston rod and the piston are centered during assembly and actual work, and the processing difficulty of parts is greatly reduced.

Description

Hydraulic pressure type pressure cylinder

Technical Field

The utility model relates to the technical field of gas-liquid reinforcement, in particular to a hydraulic pressure type pressure cylinder.

Background

The booster cylinder is a hydraulic component that can convert an input pressure to output a higher pressure. A hydraulic pressure cylinder is a type of pressure cylinder, which is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). The hydraulic pressure cylinder working in the mechanical sealing auxiliary system is mainly used for keeping the pressure of a pipeline in a pressure maintaining state. But the machining precision requirement is very high because the sealing cavity is required to achieve the non-leakage special property.

On the existing hydraulic pressure cylinder products on the market, a piston rod and a piston are basically integrated, firstly, the length and the surface roughness of the piston rod have very high requirements on processing, and the hydraulic pressure cylinder has very high requirements on the internal roughness and the centering concentricity of a cylinder body; secondly, the concentricity requirement of the combination (bolt fixation) of the double cylinders is very high, so the processing difficulty is large, the piston is positioned in the inner cylinder, the piston rod is positioned in the outer cylinder, the piston and the rod piece are welded structures and are all rigidly connected, and the parts and the inner wall of the cylinder do not have flexible contact surfaces. Therefore, the piston rod and piston integrated structure not only has great influence on the performance of the hydraulic pressure cylinder, but also greatly increases the starting pressure and the using effect of the hydraulic pressure cylinder.

SUMMERY OF THE UTILITY MODEL

The utility model aims to disclose a hydraulic pressure cylinder, which solves the problem that the existing hydraulic pressure cylinder has very high requirement on the processing precision of concentricity.

In order to achieve the purpose, the utility model provides a hydraulic pressure cylinder which comprises a cylinder body, a lower end cover and an upper end cover, wherein the lower end cover and the upper end cover are arranged at two ends of the cylinder body, a columnar cavity is formed by enclosing the cylinder body, the lower end cover and the upper end cover, a piston rod penetrates through the upper end cover from top to bottom, the lower end of the piston rod extends into the cavity and is connected with a piston, the cavity is communicated with the outside of the cylinder body, the piston rod is connected with the piston in a split mode, the hydraulic pressure cylinder further comprises a piston cover plate connected to the upper portion of the piston, the piston cover plate is connected with the piston to form an accommodating cavity, the piston rod comprises a rod body and a connecting portion connected to the lower end of the rod body in an integrated mode, the rod body extends downwards to enter the accommodating cavity, and the connecting portion can move in the accommodating cavity.

As a further improvement of the present invention, the hydraulic pressure cylinder further includes an upper gland connected to the upper end cover, and the rod body penetrates through the upper gland and the upper end cover from top to bottom.

As a further improvement of the utility model, a rod hole penetrating through the upper end surface and the lower end surface of the upper end cover is arranged in the center of the upper end cover, the rod body extends to the cavity through the rod hole, and a shaft sealing ring and a shaft guide ring are arranged on the side wall of the rod hole.

As a further improvement of the utility model, the lower end cover is provided with an inlet and an outlet for inputting and outputting liquid, and the upper end cover is provided with a channel for inputting and outputting liquid.

As a further improvement of the utility model, a circle of hole sealing ring and a hole guide ring are arranged between the circular outer wall of the piston and the inner wall of the cylinder body.

As a further improvement of the utility model, the upper end of the piston is provided with a circular groove, the upper part of the piston is connected with a piston cover plate, and the piston cover plate is connected with the piston to form an accommodating cavity.

As a further improvement of the utility model, the connecting part is circular, the lower end of the rod body penetrates through the piston cover plate, and the connecting part is accommodated in the accommodating cavity.

As a further improvement of the present invention, the diameter of the housing chamber is larger than the diameter of the connecting portion, the connecting portion is movable in a radial direction of the housing chamber, the height of the housing chamber is larger than the height of the connecting portion, and the connecting portion is movable in an axial direction of the housing chamber.

As a further improvement of the present invention, a through hole for the rod to pass through is disposed in the middle of the piston cover plate, a circle of elastic element is disposed at the through hole, and the rod is elastically abutted to the piston cover plate at the through hole through the elastic element.

As a further improvement of the utility model, the rod body and the piston are arranged concentrically.

Compared with the prior art, the utility model has the beneficial effects that:

according to the hydraulic pressure cylinder, the piston rod and the piston are connected in a split mode, and the centering relation between the piston rod and the piston is adjusted by adjusting the position of the connecting part in the accommodating cavity, so that the piston rod and the piston are centered during assembly and actual work, the processing difficulty of parts is greatly reduced, meanwhile, the use stability of the hydraulic pressure cylinder is improved, and the hydraulic pressure cylinder can tend to be in a more ideal working state.

Drawings

FIG. 1 is a schematic perspective view of a hydraulic pressure cylinder according to the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a schematic view of the piston rod and piston connection of fig. 2.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

It will be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," "positive," "negative," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present disclosure.

Referring to fig. 1 to 3, a hydraulic pressure cylinder 100 includes a cylinder body 1, a lower end cap 2 and an upper end cap 3 disposed at two ends of the cylinder body 1, an upper gland 7 disposed on the upper end cap 3, a cylindrical cavity 10 defined by the cylinder body 1, the lower end cap 2, and the upper end cap 3, and a piston rod 4 penetrating the upper gland 7 and the upper end cap 3 from top to bottom. The lower end of the piston rod 4 extends into the cavity 10 and is connected with the piston 5, and the piston rod 4 is connected with the piston 5 in a split mode. The outer diameter of the piston 5 is the same as the inner diameter of the cylinder 1, that is, the outer side of the piston 5 is closely attached to the inner wall of the cylinder 1, so that the cylinder 1, the piston 5 and the lower end cap 2 enclose a first cavity 11, and the cylinder 1, the piston 5 and the upper end cap 3 enclose a second cavity 12. The lower end cover 2 is provided with an inlet and outlet 21 for inputting and outputting a first liquid, and the upper end cover 3 is provided with a channel 32 for inputting and outputting a second liquid. The piston rod 4 and the piston 5 are connected in a split mode, so that the piston rod 4 and the piston 5 can be automatically centered, and the processing difficulty of parts of the hydraulic pressure cylinder 100 is greatly reduced.

The following description will specifically describe each component and the connection relationship between the components in the hydraulic pressure cylinder 100 according to the preferred embodiment of the present invention.

The cylinder body 1 is cylindrical, the outer diameters of the upper end cover 3 and the lower end cover 2 are larger than that of the cylinder body 1, and a plurality of studs (not marked) are connected between the upper end cover 3 and the lower end cover 2 and used for reinforcing the whole hydraulic pressure cylinder 100. The cylinder body 1 is also externally connected with a mounting bracket 13.

The upper end cover 3 and the upper gland 7 are both circular, the upper gland 7 can be connected with the upper end cover 3 through bolts, the lower surface of the upper gland 7 is partially attached to the upper surface of the upper end cover 3, and the upper gland 7 is fixedly connected to the upper end cover 3 to further reinforce the connection between the upper end cover 3 and the cylinder body 1. A rod hole 31 penetrates the centers of the upper cover 5 and the upper end cover 3, and the piston rod 4 extends downward through the rod hole 31. The upper end cover 3 and the cylinder body 1 are arranged concentrically, and the piston rod 4, the cylinder body 1 and the upper end cover 3 are arranged concentrically. The side wall of the rod hole 31 is provided with two circles of grooves, wherein a sealing ring 33 for a shaft is arranged in one circle of groove, and a guide ring 34 for the shaft is arranged in the other circle of groove. The shaft seal ring 33 and the shaft guide ring 34 are attached to the outer periphery of the piston rod 4, and serve to seal the connection between the piston rod 4 and the upper end cap 3, thereby preventing the second liquid from leaking from the rod hole 31. A first sealing ring 35 is arranged between the side part of the upper end cover 3 located in the cavity 10 and the inner wall of the cylinder body 1, and in this embodiment, the first sealing ring 35 is an O-ring. Four passages 32 are arranged in the upper end cap 3, a first port 321 of the passage 32 is provided at a side portion of the upper end cap 3, and a second port 322 of the passage 32 is provided at a lower portion of the upper end cap 3 and is attached to the rod hole 31. Two of the passages 32 are used for inflow and outflow of the second liquid, another passage 32 is used for exhaust, and another passage 32 is used for backup. In operation, the first passage 32 is used for the flow of the second liquid into and out of the second chamber 12, and during pressurization, the second liquid enters the passage 32 from the second port 322 and flows out from the first port 321; during the pressure relief, the second liquid flows into the channel 32 from the first port 321 and into the second cavity 12 from the second port 322.

The lower end cover 2 is circular, and a second sealing ring 22 is arranged between the side part of the lower end cover 2 located in the cavity 10 and the inner wall of the cylinder body 1, wherein in the embodiment, the second sealing ring 22 is an O-ring. The inlet and outlet 21 penetrates through the upper surface and the lower surface of the lower end cover 2, and during operation, the inlet and outlet 21 flows into the first cavity 11 in the pressurization process; during the pressure relief process, the first liquid flows out from the first inlet/outlet 21.

A circle of hole sealing ring 51 and a hole guide ring 52 are arranged between the circular outer wall of the piston 5 and the inner wall of the cylinder body 1, the cavity 10 of the cylinder body 1 is divided into a first cavity 11 and a second cavity 12 by the piston 5, and the hole sealing ring 51 and the hole guide ring 52 can effectively prevent liquid in the first cavity 11 and the second cavity 12 from streaming, so that smooth pressurization work is guaranteed. The upper end of the piston 5 is provided with a circular groove 53, the upper part of the piston 5 is provided with a piston cover plate 6, the piston cover plate 6 and the piston 5 can be fixedly connected through screws, and the piston cover plate 6 and the piston 5 are connected to form an accommodating cavity 531. The piston cover plate 6 is provided with a through hole (not labeled) in the middle for the piston rod 4 to pass through, and a ring of elastic element 61 is arranged at the through hole, that is, the piston rod 4 is elastically abutted against the piston cover plate 53 at the through hole through the elastic element 61.

The piston rod 4 includes a rod 41 and a connecting portion 42 integrally connected to a lower end of the rod 41, the connecting portion 42 is circular, a lower end of the rod 41 located in the second cavity 12 penetrates through the piston cover plate 6, and the connecting portion 42 is received in the receiving cavity 531. The diameter of the accommodating cavity 531 is greater than that of the connecting part 42, and the height of the accommodating cavity 531 is greater than that of the connecting part 42, so that the connecting part 42 can move in the accommodating cavity 531 in the radial and axial directions, and the piston rod 4 can adjust the centering relationship between the piston rod 4 and the piston 5 by adjusting the position of the connecting part 42 in the accommodating cavity 531 due to the elastic abutting between the piston rod 4 and the piston cover plate 6, so that the centering of the piston rod 4 and the piston 5 is realized, only the centering of the piston cover plate 6 and the piston 5 is needed, the processing requirements on the piston rod 4 and the piston 5 are reduced, and the processing requirements on the concentricity of the upper end cover 3, the lower end cover 2 and the cylinder body 1 are also reduced.

According to the hydraulic pressure cylinder 100, the piston rod 4 and the piston 5 are connected in a split manner, so that the piston rod 4 and the piston 5 can be automatically centered during assembly and actual work, the processing difficulty of parts is greatly reduced, and the assembly, disassembly and maintenance difficulty of the hydraulic pressure cylinder is greatly reduced. Moreover, the piston rod 4 and the piston 5 can realize automatic centering, so that the use stability of the hydraulic pressure cylinder 100 is improved, and the hydraulic pressure cylinder tends to be in a more ideal working state.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A hydraulic pressure cylinder comprises a cylinder body (1), a lower end cover (2) and an upper end cover (3) which are arranged at two ends of the cylinder body (1), a cylindrical cavity (10) is formed by enclosing the cylinder body (1), the lower end cover (2) and the upper end cover (3), a piston rod (4) penetrates through the upper end cover (3) from top to bottom, the lower end of the piston rod (4) extends into the cavity (10) and is connected with a piston (5), the cavity (10) is communicated with the outside of the cylinder body (1), the hydraulic pressure cylinder is characterized in that the piston rod (4) is connected with the piston (5) in a split mode, the hydraulic pressure cylinder further comprises a piston cover plate (6) connected to the upper portion of the piston (5), the piston cover plate (6) is connected with the piston (5) to form an accommodating cavity (531), the piston rod (4) comprises a rod body (41) and a connecting portion (42) integrally connected to the lower end of the rod body (41), the rod body (41) extends downwards to enter the containing cavity (531), and the connecting part (42) can move in the containing cavity (531).

2. The hydraulic pressure cylinder as recited in claim 1, further comprising an upper cover (7) connected to the upper end cover (3), wherein the rod body (41) penetrates the upper cover (7) and the upper end cover (3) from top to bottom.

3. The hydraulic pressure cylinder according to claim 1, wherein a rod hole (31) penetrating through upper and lower end surfaces of the upper end cover (3) is provided at a center of the upper end cover (3), the rod body (41) extends to the cavity (10) through the rod hole (31), and a shaft seal ring (33) and a shaft guide ring (34) are provided on a side wall of the rod hole (31).

4. The hydraulic pressure booster cylinder as claimed in claim 1, characterized in that the lower end cover (2) is provided with an inlet and outlet (21) for the input and output of liquid, and the upper end cover (3) is provided with a channel (32) for the input and output of liquid.

5. The hydraulic pressure intensifier cylinder according to claim 1, characterized in that a sealing ring (51) for a hole and a guide ring (52) for a hole are provided between the circular outer wall of the piston (5) and the inner wall of the cylinder body (1).

6. The hydraulic pressure cylinder as claimed in claim 1, characterized in that the upper end of the piston (5) is provided with a circular recess (53), and a piston cover plate (6) is connected to the upper part of the piston (5), and the piston cover plate (6) is connected to the piston (5) to form a receiving chamber (531).

7. The hydraulic pressure cylinder as claimed in claim 6, characterized in that the connecting portion (42) is circular, the lower end of the rod body (41) passes through the piston cover plate (6), and the connecting portion (42) is accommodated in the accommodating chamber (531).

8. The hydraulic pressure cylinder as recited in claim 7, characterized in that the diameter of the receiving chamber (531) is larger than the diameter of the connecting portion (42), the connecting portion (42) being movable in a radial direction of the receiving chamber (531), the height of the receiving chamber (531) being larger than the height of the connecting portion (42), the connecting portion (42) being movable in an axial direction of the receiving chamber (531).

9. The hydraulic pressure cylinder as claimed in claim 7, characterized in that the piston cover plate (6) is provided in the middle with a through hole for the rod body (41) to pass through, and a ring of elastic elements (61) is provided at the through hole, and the rod body (41) is elastically abutted against the piston cover plate (6) at the through hole by the elastic elements (61).

10. The hydraulic pressure intensifier cylinder according to claim 1, characterized in that the rod body (41) is arranged concentrically to the piston (5).