CN112747003A

CN112747003A - Expanding positioning oil cylinder

Info

Publication number: CN112747003A
Application number: CN202011418177.5A
Authority: CN
Inventors: 张红林
Original assignee: Suzhou Industrial Park Zone Hongsite Electromechanical Co ltd
Current assignee: Suzhou Industrial Park Zone Hongsite Electromechanical Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-05-04

Abstract

The invention relates to an expanding positioning oil cylinder, which comprises a pull rod and a cylinder body; the cylinder body is provided with an oil path channel and an air path channel which are communicated with each other; a slidable piston rod is arranged in the cylinder body; the pull rod is inserted into the cylinder body in an axially movable manner, and the bottom of the pull rod and the piston rod are connected with the cylinder body; the bottom of the pull rod is circumferentially provided with a first engaging element, the top of the piston rod is circumferentially provided with a second engaging element, and the first engaging element and the second engaging element are mutually meshed; the end part of the pull rod is sleeved with an expansion sleeve, and the outer wall of the pull rod is sleeved with a stress sleeve; the top outer wall of the stress sleeve is attached to the bottom inner wall of the expansion sleeve, and the bottom outer wall of the stress sleeve is attached to the inner wall of the cylinder body; the bottom circumference of atress cover sets up third engaging element, and the inner wall circumference of cylinder body sets up fourth engaging element, and third engaging element and fourth engaging element interlock each other. The invention increases the repeated positioning precision of the small-aperture process hole product.

Description

Expanding positioning oil cylinder

Technical Field

The invention relates to the technical field of clamping devices, in particular to an expanding positioning oil cylinder.

Background

In the field of hydraulic and pneumatic clamps, a one-surface two-pin positioning principle is often used, wherein two pins are key parts for ensuring the production quality of a product, and a person skilled in the art often adopts the matching tolerance of H7/g6, so that the positioning of the product still has a certain clearance, which causes the tolerance of the product to be out of tolerance. When the problems are solved, an expansion sleeve mechanism is adopted, but the structure of the existing expansion sleeve mechanism is complex, and the traditional expansion sleeve structure is developed, so that the expansion sleeve is more and more difficult to manufacture when the hole diameter below D16 is reached, and the positioning of the smaller hole diameter cannot be processed.

Disclosure of Invention

Aiming at the defects of the prior art, the invention discloses a diameter-expanding positioning oil cylinder.

The technical scheme adopted by the invention is as follows:

an expanding positioning oil cylinder comprises a pull rod and a cylinder body; the cylinder body is provided with an oil path channel and an air path channel which are communicated with each other; a slidable piston rod is arranged in the cylinder body; the pull rod is inserted into the cylinder body in an axially movable mode, and the bottom of the pull rod and the piston rod are connected with the cylinder body in a sliding mode; a first engaging element is circumferentially arranged at the bottom of the pull rod, a second engaging element is circumferentially arranged at the top of the piston rod, and the first engaging element and the second engaging element are mutually meshed; an expansion sleeve is sleeved at the end part of the pull rod, and a stress sleeve is sleeved on the outer wall of the pull rod; the top outer wall of the stress sleeve is attached to the bottom inner wall of the expansion sleeve, and the bottom outer wall of the stress sleeve is attached to the inner wall of the cylinder body; the bottom circumference of atress cover sets up third engaging element, the inner wall circumference of cylinder body sets up fourth engaging element, third engaging element with fourth engaging element interlock each other.

The method is further technically characterized in that: the first and second engagement members are each multi-turn threads.

The method is further technically characterized in that: the third engagement member and the fourth engagement member are each a plurality of turns of threads.

The method is further technically characterized in that: the expansion sleeve comprises a circular ring body; the ring body is provided with a notch, and an included angle is formed between the tangential direction of the notch and the axis of the ring body.

The method is further technically characterized in that: a first sealing groove and a second sealing groove are formed in the circumferential direction of the outer wall of the piston rod, a third sealing ring is filled in the first sealing groove, and a fifth sealing ring is filled in the second sealing groove; the third sealing ring and the fifth sealing ring are both abutted to the inner wall of the cylinder body.

The method is further technically characterized in that: the oil path channel and the gas path channel are both arranged along the radial direction of the cylinder body, and a second plug is arranged at the inlet of the oil path channel; and a third plug is arranged at the inlet of the gas path channel.

The method is further technically characterized in that: the cylinder body is also provided with a first discharge port, a second discharge port and a third discharge port; the axis of the first discharge port, the axis of the second discharge port, and the axis of the third discharge port are parallel to each other; the first discharge port and the second discharge port are respectively provided with a fourth sealing ring; the third discharge port is provided with a first plug.

The method is further technically characterized in that: and the fourth sealing ring of the first discharge port and the fourth sealing ring of the second discharge port are on the same horizontal line.

The method is further technically characterized in that: a piston plug is arranged below the piston rod and extends into the cylinder body; a third sealing groove and a fourth sealing groove are formed in the circumferential direction of the outer wall of the piston plug; a second sealing ring is filled in the third sealing groove and is abutted against the inner wall of the cylinder body; and a first sealing ring is filled in the fourth sealing groove.

The method is further technically characterized in that: a first step is arranged on the inner wall of the bottom of the cylinder body; the outer wall of the piston plug is provided with a second step; the first step and the second step abut against each other.

The invention has the following beneficial effects:

1. the invention solves the problem of low repeated positioning precision of multiple clamping of products.

2. The invention solves the problem that the existing expansion sleeve structure cannot be used in small aperture of the product.

3. The invention is suitable for small aperture positioning of D8-D16, and the positioning precision is within 0.008 mm.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged schematic view of a point a in fig. 1.

Fig. 3 is a top view of the present invention.

Fig. 4 is a cross-sectional view taken at B-B in fig. 3.

In the figure: 1. a cylinder body; 2. a stress sleeve; 3. expanding sleeves; 4. a pull rod; 5. a first plug; 6. an oil road channel; 7. a piston rod; 8. a piston plug; 9. a first seal ring; 10. a second seal ring; 11. a third seal ring; 12. a fourth seal ring; 13. a gas path channel; 14. a fifth seal ring; 15. a second plug; 16. and a third plug.

Detailed Description

The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Therefore, the directional terminology used is for the purpose of describing, but not limiting, the invention, and moreover, like reference numerals designate like elements throughout the embodiments.

The following describes a specific embodiment of the present embodiment with reference to the drawings.

Fig. 1 is a schematic structural view of the present invention, fig. 2 is an enlarged view of a point a in fig. 1, fig. 3 is a plan view of the present invention, and fig. 4 is a cross-sectional view of a point B-B in fig. 3. Referring to fig. 1 to 4, the expanding positioning oil cylinder comprises a pull rod 4 and a cylinder body 1. The cylinder body 1 is provided with an oil passage 6 and an air passage 13 which are communicated with each other. The air passage 13 is communicated with cleaning fluid, the fluid can be cleaning liquid or compressed air, and the cleaning fluid discharged from the air passage 13 cleans the cylinder 1. A piston rod 7 is slidably mounted in the cylinder 1, the piston rod 7 being axially movable relative to the cylinder 1.

The pull rod 4 is inserted into the cylinder 1 so as to be axially movable, and the bottom of the pull rod 4 and the piston rod 7. The bottom of the pull rod 4 is circumferentially provided with a first engagement element and the top of the piston rod 7 is circumferentially provided with a second engagement element, the first and second engagement elements being mutually engageable. Preferably, the first and second engagement members are each multi-turn threads. The end part of the pull rod 4 is sleeved with an expansion sleeve 3, and the expansion sleeve 3 comprises a circular ring body. The ring body is provided with a notch, and an included angle is formed between the tangential direction of the notch and the axis of the ring body. The space occupation rate of the expansion sleeve 3 is small, and the problem that the existing expansion sleeve structure cannot be used due to small aperture is solved. The expansion sleeve 3 can be made of 65Mn or 75Mn spring steel, the precision of the expansion sleeve 3 made of 65Mn spring steel is higher, and the stability of the 65Mn spring steel is optimal.

The outer wall of the pull rod 4 is sleeved with a stress sleeve 2, and the stress sleeve 2 can enable the pull rod 4 to move smoothly and reliably in the radial direction. The top outer wall of the stress sleeve 2 is attached to the bottom inner wall of the expansion sleeve 3, and the bottom outer wall of the stress sleeve 2 is attached to the inner wall of the cylinder body 1. The bottom circumference of the stress sleeve 2 is provided with a third engaging element, the inner wall circumference of the cylinder body 1 is provided with a fourth engaging element, and the third engaging element and the fourth engaging element are mutually meshed. Preferably, the third engagement element and the fourth engagement element are both multi-turn threads.

The outer wall circumference of piston rod 7 is seted up first seal groove and second seal groove, and third sealing washer 11 is filled in the first seal groove, and fifth sealing washer 14 is filled in the second seal groove. The third seal ring 11 and the fifth seal ring 14 are both abutted against the inner wall of the cylinder block 1. The third and fifth packing 11 and 14 can prevent foreign materials from entering the cylinder 1. Preferably, the third 11 and fifth 14 sealing rings are greige rings comprising a PTFE sliding ring and a rubber O-ring, the greige rings being a dynamic seal ensuring excellent low friction and high speed performance of the piston rod 7, a chemical resistance superior to all other thermoplastics and elastomers, almost compatibility with all liquid materials, the side grooves ensuring enhanced pressure load of the O-ring under any working conditions. The static O-shaped ring element on the inner side has the characteristic of low permanent deformation, no stick-slip movement tendency, space-saving structure, simple groove design, high compatibility, almost compatibility with all fluids, high extrusion resistance and excellent high-temperature resistance.

The oil path channel 6 and the air path channel 13 are both arranged along the radial direction of the cylinder body 1, and a second plug 15 is arranged at the inlet of the oil path channel 6. A third plug 16 is arranged at the inlet of the air passage channel 13.

The cylinder body 1 is also provided with a first discharge port, a second discharge port and a third discharge port. The axis of the first discharge port, the axis of the second discharge port, and the axis of the third discharge port are parallel to each other. The first discharge port and the second discharge port are provided with fourth seal rings 12, respectively. The third outlet is provided with a first plug 5. When air is introduced into the air passage 13 for cleaning the garbage in the cylinder 1, the garbage in the cylinder 1 can be discharged from the second discharge port.

The fourth sealing ring 12 of the first discharge opening and the fourth sealing ring 12 of the second discharge opening are on the same horizontal line.

A piston plug 8 is arranged below the piston rod 7, and the piston plug 8 extends into the cylinder body 1. And a third sealing groove and a fourth sealing groove are formed in the circumferential direction of the outer wall of the piston plug 8. And a second sealing ring 10 is filled in the third sealing groove, and the second sealing ring 10 is abutted against the inner wall of the cylinder body 1. The fourth sealing groove is filled with a first sealing ring 9.

The inner wall of the bottom of the cylinder body 1 is provided with a first step. And a second step is arranged on the outer wall of the piston plug 8. The first step and the second step abut against each other.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, the scope of the invention being defined by the appended claims, which may be modified in any manner without departing from the basic structure thereof.

Claims

1. An expanding positioning oil cylinder is characterized in that: comprises a pull rod (4) and a cylinder body (1); the cylinder body (1) is provided with an oil path channel (6) and an air path channel (13) which are communicated with each other; a slidable piston rod (7) is arranged in the cylinder body (1); the pull rod (4) is inserted into the cylinder body (1) in an axially movable manner, and the bottom of the pull rod (4) and the piston rod (7) are connected; a first engaging element is circumferentially arranged at the bottom of the pull rod (4), a second engaging element is circumferentially arranged at the top of the piston rod (7), and the first engaging element and the second engaging element are mutually meshed; an expansion sleeve (3) is sleeved at the end part of the pull rod (4), and a stress sleeve (2) is sleeved on the outer wall of the pull rod (4); the top outer wall of the stress sleeve (2) is attached to the bottom inner wall of the expansion sleeve (3), and the bottom outer wall of the stress sleeve (2) is attached to the inner wall of the cylinder body (1); the bottom circumference of atress cover (2) sets up the third engaging element, the inner wall circumference of cylinder body (1) sets up the fourth engaging element, the third engaging element with the fourth engaging element interlock each other.

2. The expanding positioning cylinder of claim 1, wherein: the first and second engagement members are each multi-turn threads.

3. The expanding positioning cylinder of claim 1, wherein: the third engagement member and the fourth engagement member are each a plurality of turns of threads.

4. The expanding positioning cylinder of claim 1, wherein: the expansion sleeve (3) comprises a circular ring body; the ring body is provided with a notch, and an included angle is formed between the tangential direction of the notch and the axis of the ring body.

5. The expanding positioning cylinder of claim 1, wherein: a first sealing groove and a second sealing groove are formed in the circumferential direction of the outer wall of the piston rod (7), a third sealing ring (11) is filled in the first sealing groove, and a fifth sealing ring (14) is filled in the second sealing groove; and the third sealing ring (11) and the fifth sealing ring (14) are abutted against the inner wall of the cylinder body (1).

6. The expanding positioning cylinder of claim 1, wherein: the oil-way channel (6) and the gas-way channel (13) are both arranged along the radial direction of the cylinder body (1), and a second plug (15) is arranged at the inlet of the oil-way channel (6); and a third plug (16) is arranged at the inlet of the air passage channel (13).

7. The expanding positioning cylinder of claim 1, wherein: the cylinder body (1) is also provided with a first discharge port, a second discharge port and a third discharge port; the axis of the first discharge port, the axis of the second discharge port, and the axis of the third discharge port are parallel to each other; fourth sealing rings (12) are respectively arranged at the first discharge port and the second discharge port; the third discharge port is provided with a first plug (5).

8. The expanding positioning cylinder of claim 7, wherein: and the fourth sealing ring (12) of the first discharge port and the fourth sealing ring (12) of the second discharge port are on the same horizontal line.

9. The expanding positioning cylinder of claim 1, wherein: a piston plug (8) is arranged below the piston rod (7), and the piston plug (8) extends into the cylinder body (1); a third sealing groove and a fourth sealing groove are formed in the circumferential direction of the outer wall of the piston plug (8); a second sealing ring (10) is filled in the third sealing groove, and the second sealing ring (10) is abutted against the inner wall of the cylinder body (1); and a first sealing ring (9) is filled in the fourth sealing groove.

10. The expanding positioning cylinder of claim 9, wherein: a first step is arranged on the inner wall of the bottom of the cylinder body (1); a second step is arranged on the outer wall of the piston plug (8); the first step and the second step abut against each other.