CN115122039A

CN115122039A - Slider type piston ring

Info

Publication number: CN115122039A
Application number: CN202210711557.0A
Authority: CN
Inventors: 唐永斌; 吴江巍; 袁丽; 周元奇; 周长旭
Original assignee: Sichuan Aerospace Changzheng Equipment Manufacturing Co Ltd
Current assignee: Sichuan Aerospace Changzheng Equipment Manufacturing Co Ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2022-09-30

Abstract

The invention discloses a slider type piston ring, which is characterized in that: the flange at one end of the hollow flange shaft is positioned by a boss and is in threaded connection with the piston ring assembly, and the other section of the flange is provided with a mounting interface; the rotating shaft penetrates through the hollow flange shaft and is fixed inside the hollow flange shaft through the gland, two ends of the rotating shaft are respectively connected with the bearings, one end of the rotating shaft is provided with an installation interface, the other end of the rotating shaft is provided with a trapezoidal thread connected with a central nut, and the head of the rotating shaft is connected with a limiting baffle; the piston ring assembly comprises a bottom plate, a slide rail, an outer arc block, an inner arc block, a conical block and a slide block, wherein the slide rail is arranged on the bottom plate, the outer arc block and the inner arc block are arranged on the slide rail at intervals, the outer arc block is connected with the conical block, and the inner arc block is connected with the slide block. The invention has simple structure, simple and convenient operation, stable and reliable function and serialized popularization value.

Description

Slider type piston ring

Technical Field

The invention belongs to the field of machining and relates to a sliding block type piston ring.

Background

In the automatic welding process of the circular seam butt joint of the cylinder section products, the products on two sides of the welding seam are generally supported by using a piston ring. For products with large wall thickness and loose joint requirements, local support is usually only needed, so that the requirements can be met by adopting simple clamps such as a cross screw type internal support. On the occasion that the wall thickness of a product is small and the requirement on the staggered joint quantity is particularly strict, the product needs to be supported in a full circle and in a seamless mode, the required piston ring not only needs to support the product in a circle and tightly, but also needs to bear large contraction force in the welding line cooling process, and therefore the product needs to have high strength and rigidity, and the structure is usually complex.

The expansion ring capable of being supported in a full ring generally consists of inner arc blocks and outer arc blocks which are distributed at intervals, the inner arc blocks and the outer arc blocks are spliced into a whole circle under the working state, and no or very small gaps exist among the arc blocks. The wedge type piston ring is a typical piston ring capable of being supported by a full ring, is widely applied in actual production, but the existing structure has a problem: when the inner arc block is loosened, the inner arc block should retract before the outer arc block, but because the inner arc block and the outer arc block are mutually overlapped in the tightening state, the resistance is large when the inner arc block retracts, the reset force of the spring is insufficient, the dead point state is often caused, the dead point state needs to be relieved by adopting methods such as knocking, and the like, and then the automatic retraction of each arc block is completed under the action of the reset spring. Practice shows that the clamping stagnation problem is solved, the effect of only thickening the return spring is not obvious, and therefore the piston ring structure needs to be improved and designed.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a sliding block type piston ring and effectively solves the problem that the existing wedge type piston ring is blocked in the loosening operation process.

In order to achieve the purpose, the invention adopts the following technical scheme:

a slider type piston ring comprises a hollow flange shaft, a rotating shaft, a bearing, a central nut and a piston ring assembly, wherein a flange at one end of the hollow flange shaft is positioned by a boss and is in threaded connection with the piston ring assembly, and a mounting interface is arranged at the other section of the flange; the rotating shaft penetrates through the hollow flange shaft and is fixed inside the hollow flange shaft through the gland, two ends of the rotating shaft are respectively connected with the bearings, one end of the rotating shaft is provided with external interfaces such as a square flat surface or a key groove and the like and is used for mounting a hand wheel or other driving pieces to twist the rotating shaft, the other end of the rotating shaft is provided with a trapezoidal thread connected with a central nut, and the head of the rotating shaft is connected with a limiting baffle;

the piston ring assembly comprises a bottom plate, a slide rail, an outer arc block, an inner arc block, a conical block and a slide block, wherein the slide rail is arranged on the bottom plate, the outer arc block and the inner arc block are arranged on the slide rail at intervals, the outer arc block is connected with the conical block, and the inner arc block is connected with the slide block.

Preferably, the central nut is in a conical shape, the center of the central nut is provided with a trapezoidal thread, and the outer conical surface of the central nut is provided with a sliding groove along the direction of a bus.

Further preferably, the taper angle of the taper block matches the outer taper angle of the central nut.

Preferably, the slider is sized to fit into a slot of the central nut.

Preferably, the bottom plate is further connected with a sealing plate through a stand column.

Preferably, a tension spring is connected between the sealing plate and the outer arc block.

According to the invention, after the spring reset mode of the inner arc block of the wedge type piston ring is changed into the reset mode of the movement mechanism, the problems that the inner arc block and the outer arc block are mutually overlapped in a tightening state, the resistance is large when the inner arc block retracts, the reset force of the spring is insufficient, and the spring is often blocked are solved; when the inner arc block retracts, the inner arc block is not blocked any more, and after the inner arc block retracts, the outer arc block can also be reset smoothly under the action of the tension spring.

The invention has the following advantages:

the invention has simple structure, simple and convenient operation, stable and reliable function and serialized popularization value.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a schematic view of the structure of the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic view of a hollow flange shaft configuration;

FIG. 5 is a schematic view of a rotating shaft structure;

FIG. 6 is a schematic view of a central nut;

FIG. 7 is a schematic view of the piston ring assembly;

FIG. 8 is a cross-sectional view A-A of FIG. 7;

FIG. 9 is a cross-sectional view B-B of FIG. 7;

FIG. 10 is a view taken in the direction K of FIG. 8;

FIG. 11 is a cross-sectional view C-C of FIG. 10;

FIG. 12 is a schematic view of an outer arc block structure;

FIG. 13 is a schematic view of an inner arc block structure;

FIG. 14 is a schematic view of a cone block structure;

FIG. 15 is a schematic view of a slider configuration.

In the figure: 1. the device comprises a hollow flange shaft, 2 parts of a rotating shaft, 3 parts of a bearing, 4 parts of a gland, 5 parts of a central nut, 6 parts of a piston ring assembly, 7 parts of a limit baffle, 6-1 parts of a bottom plate, 6-2 parts of a sliding block, 6-3 parts of a conical block, 6-4 parts of a sliding rail, 6-5 parts of a tension spring, 6-6 parts of a sealing plate, 6-7 parts of an outer arc block, 6-8 parts of an inner arc block, 6-9 parts of an upright post.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment is as follows:

a sliding block type piston ring comprises a hollow flange shaft 1, a rotating shaft 2, a bearing 3, a central nut 5 and a piston ring assembly 6, wherein a flange at one end of the hollow flange shaft 1 is positioned by a boss and is in threaded connection with the piston ring assembly 6, and the other section of the flange is provided with an installation interface; the rotating shaft 2 penetrates through the hollow flange shaft 1 and is fixed inside the hollow flange shaft 1 through the gland 4, two ends of the rotating shaft 2 are respectively connected with the bearings 3, one end of the rotating shaft 2 is provided with external interfaces such as square flat or key grooves and the like for mounting a hand wheel or other driving pieces to twist the rotating shaft, the other end of the rotating shaft is provided with a trapezoidal thread connecting central nut 5, and the head of the rotating shaft 2 is connected with a limiting baffle 7;

the piston ring assembly 6 comprises a bottom plate 6-1, a slide rail 6-4, an outer arc block 6-7, an inner arc block 6-8, a conical block 6-3 and a slide block 6-2, the slide rail 6-4 is arranged on the bottom plate 6-1, the outer arc block 6-7 and the inner arc block 6-8 are arranged on the slide rail 6-4 at intervals, the outer arc block 6-7 is connected with the conical block 6-3, and the inner arc block 6-8 is connected with the slide block 6-2.

The hollow flange shaft 1 is used as a base of the whole device, an outward mounting interface is arranged on a flange at one end, and a flange at the other end is in threaded connection with the piston ring assembly 6 through boss positioning. One end of the rotating shaft 2 is provided with trapezoidal threads, and the other end of the rotating shaft is provided with external interfaces such as square flat surfaces or key grooves and the like for installing a hand wheel or other driving parts to screw the rotating shaft. The trapezoidal thread end of the rotating shaft 2 is sleeved with a central nut 5, and the head of the rotating shaft is connected with a limit baffle 7. The shape of the central nut 5 is cone-shaped, the center is trapezoidal thread, and 4 sliding grooves are formed in the outer conical surface along the direction of a bus. The piston ring assembly 6 is provided with 8 sliding rails 6-4 on a bottom plate 6-1, and 8 arc blocks of an inner group and an outer group are arranged on the sliding rails 6-4 at intervals, wherein the rear part of the outer arc block 6-7 is provided with a conical block 6-3, and the rear end of the inner arc block 6-8 is provided with a sliding block 6-2. The taper angle of the taper block 6-3 is consistent with the outer taper angle of the central nut 5, and the shape and the size of the slide block 6-2 are matched with the chute of the central nut 5. The bottom plate 6-1 is also in transition connection with a sealing plate 6-6 through an upright post 6-9, and a tension spring 6-5 is connected between the sealing plate and the outer arc block.

When the device works, the sliding block type piston ring is connected to a rotary table of welding equipment through an external interface reserved at one end of a hollow flange shaft, a product to be welded is sleeved on the piston ring, after the center of a welding seam of the product is basically aligned with the center of a welding leakage groove reserved on an arc block of the piston ring, the rotating shaft is rotated to drive the center nut to move towards the near end, meanwhile, the center nut directly pushes the cone block and the outer arc block to expand outwards through the outer conical surface on one hand, and drives the sliding block and the inner arc block to expand outwards through the sliding groove on the other hand, and after the inner arc block and the outer arc block are mutually overlapped to form a whole circle to support the product tightly, relevant operation of product welding can be carried out. When the loosening operation is needed after the welding is finished, the rotating shaft is reversely rotated, the central nut moves towards the far end, the sliding block drives the inner arc block to retract, and after a certain gap is formed between the outer conical surface of the central nut and the conical surface of the conical block, the outer arc block also starts to retract under the action of the tension spring until the product is completely loosened.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of steps disclosed.

Claims

1. The utility model provides a slider formula piston ring which characterized in that: the flange at one end of the hollow flange shaft is positioned by a boss and is in threaded connection with the piston ring assembly, and the other section of the flange is provided with a mounting interface; the rotating shaft penetrates through the hollow flange shaft and is fixed inside the hollow flange shaft through the gland, two ends of the rotating shaft are respectively connected with the bearings, one end of the rotating shaft is provided with an installation interface, the other end of the rotating shaft is provided with a trapezoidal thread connected with a central nut, and the head of the rotating shaft is connected with a limiting baffle;

2. The slider-type piston ring of claim 1, wherein: the central nut is in a conical shape, the center of the central nut is provided with trapezoidal threads, and a sliding groove is formed in the outer conical surface of the central nut along the direction of a bus.

3. The slider-type piston ring of claim 2, wherein: the taper angle of the taper block is matched with the outer taper angle of the central nut.

4. The slider-type piston ring of claim 2, wherein: the size of the sliding block is matched with the sliding groove of the central nut.

5. The slider-type piston ring of claim 1, wherein: the bottom plate is also connected with a sealing plate through a stand column.

6. The slider-type piston ring of claim 1, wherein: and a tension spring is connected between the sealing plate and the outer arc block.