WO2023245558A1

WO2023245558A1 - Piston ring having dual-angle wedged sliding blocks

Info

Publication number: WO2023245558A1
Application number: PCT/CN2022/100824
Authority: WO
Inventors: 唐永斌; 吴江巍; 袁丽; 周元奇; 周长旭
Original assignee: 四川航天长征装备制造有限公司
Priority date: 2022-06-21
Filing date: 2022-06-23
Publication date: 2023-12-28
Also published as: CN114770025B; CN114770025A

Abstract

A piston ring having dual-angle wedged sliding blocks, comprising a hollow flanged shaft (1), a rotary shaft (2), bearings (3), a central nut (5) and a piston ring assembly (6). A flange at one end of the hollow flanged shaft is in threaded connection to the piston ring assembly by means of boss positioning; the rotary shaft passes through the hollow flanged shaft and is fixed inside the hollow flanged shaft by means of a gland (4), two ends of the rotary shaft being respectively connected to the bearings, one end of the rotary shaft being connected to the central nut, and a head of the rotary shaft being connected to a stopping baffle (7). Six guide rails (6-4) are arranged on a bottom plate (6-1) of the piston ring assembly, and inner arc-shaped blocks (6-8) and outer arc-shaped blocks (6-7) are arranged on the guide rails at intervals, a wedged sliding block I (6-2) being mounted at the rear end of each inner arc-shaped block (6-8), and a wedged sliding block II (6-3) being mounted at the rear part of each outer arc-shaped block (6-7). The wedged sliding blocks are sleeved in sliding grooves of the central nut so as to form sliding pairs, the wedged sliding blocks I being installed in sliding grooves having a larger bevel angle α, and the wedged sliding blocks II being installed in sliding grooves having a smaller bevel angle β. Since speeds and travels of the inner arc-shaped blocks and the outer arc-shaped blocks expanding outwards and retracting backwards in the radial direction are different, the interference of the movements of the inner arc-shaped blocks and the outer arc-shaped blocks can be prevented by means of the difference of the speeds and the difference of the travels.

Description

A kind of double-angle wedge slider expanding circle

Technical field

The invention belongs to the field of mechanical processing and relates to a double-angle wedge slider expanding ring.

Background technique

In the process of butt girth seam welding of cylindrical products, it is generally necessary to use expansion rings to internally support the products on both sides of the weld. For products with larger wall thickness and less stringent staggered seam requirements, only partial support is usually required. Therefore, simple fixtures such as cross-screw inner supports can meet the requirements. For occasions where the wall thickness of the product is small and the requirements for staggered seams are particularly strict, the product needs to be supported seamlessly in a full circle. The required expansion ring must not only round and tighten the product, but also withstand the cooling process of the weld. It has a large shrinkage force, so it must have high strength and rigidity, and the structure is usually complex.

Existing expansion rings that can be supported in a full circle are generally composed of inner arc blocks and outer arc blocks distributed at intervals. Under working conditions, the inner and outer arc blocks are spliced into a complete circle, and there is basically no gap or very small gap between the arc blocks. When this type of expansion ring is tightened, it is usually required that the outer arc block expands before the inner arc block and when it retracts, the inner arc block retracts before the outer arc block, otherwise motion interference is likely to occur.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a double-angle wedge slide block for circle expansion, ensuring that the movement of the inner and outer arc blocks does not interfere during the tightening and relaxation process of the circle, and meeting the requirements for full circle support of the product.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A double-angle wedge slider expansion ring includes a hollow flange shaft, a rotating shaft, a bearing, a center nut and an expansion ring assembly. One end flange of the hollow flange shaft is screwed to the expansion ring assembly through a boss positioning, and the The rotating shaft passes through the hollow flange shaft and is fixed inside the hollow flange shaft through a gland. Both ends of the rotating shaft are connected to bearings, one end of the rotating shaft is connected to a center nut, and the head of the rotating shaft is connected to a limited baffle; the expansion ring The assembly includes a base plate, a guide rail, an outer arc block, an inner arc block and a wedge slider. The base plate is provided with a guide rail. The guide rail is provided with an outer arc block and an inner arc block at intervals. A wedge slider I is connected to the rear end of the inner arc block. , a wedge slider II is connected to the rear of the outer arc block.

As a preferred way, the central nut is conical, with a trapezoidal thread in the center. A first chute and a second chute are spaced along the generatrix direction on the outer cone surface. The bevel angle α of the first chute and the second chute are The inclination angle β is different in size, and the depth h1 of the first chute and the depth h2 of the second chute are different in size.

Further preferably, the wedge slider I is provided in the first slide groove, and the wedge slider II is provided in the second slide groove.

Further preferably, the inclination angle α of the first chute is greater than the inclination angle β of the second chute.

Further preferably, the bottom plate is also connected to a sealing plate through a column, and the sealing plate is provided with positioning screws.

Further preferably, the outer circles of the outer arc block and the inner arc block are connected with welding leak pads.

Further preferably, the inclination angle of the working surface of the wedge slider I is α, the inclination angle of the working surface of the wedge slider II is β, the convex height h of the wedge slider I is equal to the depth h1 of the first slide groove, and the convexity of the wedge slider II is β. The block height h' is smaller than the second chute depth h2.

The expansion ring of the present invention sets the inclination angles of the working surfaces of the two wedge sliders corresponding to the inner and outer arc blocks to be different, so that the speed and stroke of the inner and outer arc blocks to expand or retract in the radial direction are different. By using the speed The difference and stroke difference can avoid interference between the movement of the inner and outer two arc blocks.

Working principle: When working, first install the manual, electric, hydraulic or pneumatic driving device through the external interface reserved at one end of the hollow flange shaft, and then connect it to the turntable of the welding equipment. Set on the expansion ring, ensure that the center of the product weld is basically aligned with the center of the welding groove left by the arc block of the expansion ring, then rotate the shaft to drive the center nut to move proximally. At the same time, the center nut pushes the wedge slide through the chute. Block I, wedge slider II, inner arc block, and outer arc block expand outward until the inner and outer arc blocks overlap each other to form a complete circle to tighten the product, and then the product welding related operations can be performed. When the welding is completed and requires a relaxation operation, rotate the shaft in the reverse direction, move the center nut to the far end, and the wedge slider drives the inner and outer arc blocks to retract until the product is completely relaxed.

The invention has the following advantages:

The invention has novel structure, simple and convenient operation, stable and reliable function, and has serial promotion value.

Description of the drawings

Figure 1 is a perspective view of the present invention;

Figure 2 is a schematic structural diagram of the present invention;

Figure 3 is a schematic diagram of the center nut structure;

Figure 4 is a cross-sectional view along line A-A of Figure 3;

Figure 5 is a B-B cross-sectional view of Figure 3;

Figure 6 is a schematic structural diagram of the expansion ring component;

Figure 7 is a K-direction view of Figure 6;

Figure 8 is a cross-sectional view along line A-A of Figure 7;

Figure 9 is a partial enlarged view of Figure 7;

Figure 10 is a B-B cross-sectional view of Figure 9;

Figure 11 is a schematic diagram of the outer arc block structure;

Figure 12 is a schematic diagram of the inner arc block structure;

Figure 13 is a schematic structural diagram of wedge slider I;

Figure 14 is a schematic structural diagram of wedge slider II;

In the picture: 1. Hollow flange shaft, 2. Rotating shaft, 3. Bearing, 4. Gland, 5. Center nut, 6. Expansion ring component, 7. Limit baffle, 6-1, Base plate, 6-2 , wedge slider I, 6-3, wedge slider II, 6-4, guide rail, 6-5, sealing plate, 6-6, positioning screw, 6-7, outer arc block, 6-8, inner arc block , 6-9, column.

Detailed ways

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

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

Example:

As shown in Figure 1-2, a double-angle wedge slider expansion ring includes a hollow flange shaft 1, a rotating shaft 2, a bearing 3, a center nut 5 and an expansion ring assembly 6. One end of the hollow flange shaft 1 is The flange is screwed to the expansion ring assembly 6 through the boss positioning. The rotating shaft 2 passes through the hollow flange shaft 1 and is fixed inside the hollow flange shaft 1 through the gland 4. Both ends of the rotating shaft 2 are connected to bearings 3 respectively. One end of the rotating shaft 2 is connected with a central nut 5, and the head of the rotating shaft 2 is connected with a limiting baffle 7.

The hollow flange shaft 1 serves as the base of the entire device. The flange at one end is provided with an external installation interface, and the flange at the other end is screwed to the expansion ring component through boss positioning. The rotating shaft 2 passes through the hollow flange shaft 1, and bearings 3 are respectively installed at both ends, and are fixed inside the hollow flange shaft 1 through the gland 4. The trapezoidal thread end of the rotating shaft 2 is fitted with a center nut 5, and a limit baffle 7 is connected to the head. The other end of the rotating shaft 2 is provided with an external interface for installing manual, electric, hydraulic or pneumatic driving devices.

As shown in Figure 6-10, the expansion ring assembly 6 is provided with 6 guide rails 6-4 on the base plate 6-1, and two groups of inner and outer 6 arc blocks are arranged at intervals on the guide rails 6-4. The wedge slider I6-2 is installed at the rear end of the block 6-8, and the wedge slider II6-3 is installed at the rear end of the outer arc block 6-7. The wedge slider and the center nut slide groove are assembled to form a sliding pair. The wedge slider I6-2 is installed in the slide groove with a larger bevel angle α, and the wedge slider II6-3 is installed in the slide groove with a smaller bevel angle β. Inside. As shown in Figure 11-12, welding leakage pads of different materials such as stainless steel and copper need to be installed on the outer circles of the inner and outer arc blocks according to the clamping product and welding process, and the overall outer diameter and welding leakage are required to be processed in a tight state. groove. The bottom plate 6-1 of the expansion ring component is also transitionally connected to the sealing plate 6-5 through the upright column 6-9. The sealing plate 6-5 is equipped with positioning screws 6-6, which are mainly used for the overall processing of the outer diameter of the expansion ring and the welding groove. The positioning during the assembly and debugging process must be removed during the circle expansion work.

As shown in Figure 3-5, the central nut 5 is conical in shape, with a trapezoidal thread in the center. Two sets of chutes in total are spaced along the direction of the busbar on the outer cone surface. The bevel angles of the two sets of chutes are α and β. The sizes are different, and the chute depths h1 and h2 are also different.

As shown in Figure 13-14, the bevel angles of the working surfaces of wedge slider I6-2 and wedge slider II6-3 are consistent with the bevel angles of the two corresponding slide grooves of the center nut. The shape and size of the wedge slider are consistent with the center nut. The chute and the movement stroke of the inner and outer arc blocks are adapted. Specifically, the inclination angle of the working surface of wedge slider I6-2 is α, and the inclination angle of the working surface of wedge slider II6-3 is β. The height h of the wedge slider I6-2 bump is equal to the depth h1 of the chute of the center nut corresponding to the inner arc block, while the height h' of the wedge slider II6-3 bump is smaller than the chute depth h2 of the outer arc block corresponding to the center nut.

Set the inclination angles of the working surfaces of the two wedge slide blocks corresponding to the inner and outer arc blocks to be different, so that the speed and stroke of the inner and outer arc blocks expanding or retracting in the radial direction are different, and the speed difference and stroke difference are used. This can avoid interference between the movements of the inner and outer arc blocks. That is, when the product is relaxed, the inner arc block retracts faster than the outer arc block and has a longer retraction stroke. When the product is tightened, the outer arc block moves out earlier than the inner arc block. Expand.

In addition, the height h' of the wedge slider II bump is set to be smaller than the chute depth h2 of the center nut corresponding to the outer arc block, in order to ensure that the retraction driving surface of the center nut chute and the retraction working surface of the wedge slider II A certain gap is artificially left between them, that is, the empty stroke, to ensure that during the relaxation operation, the center nut first drives the wedge slider I and the inner arc block to retract, and then the retraction driving surface of the center nut chute and the wedge slider II retract. The retracting working surface contacts, thereby driving the wedge slider II and the outer arc block to retract. Setting the inner and outer arc blocks to retract in sequence is more conducive to improving the reliability of the entire device and eliminating problems such as motion stagnation.

The present invention is not limited to the specific embodiments described above. The invention extends to any new features or any new combinations disclosed in this specification, as well as to any new method or process steps disclosed or any new combinations.

Claims

A double-angle wedge slider expansion ring, which is characterized by: including a hollow flange shaft, a rotating shaft, a bearing, a center nut and an expansion ring assembly. One end flange of the hollow flange shaft is positioned with the expansion ring assembly through a boss. Connect, the rotating shaft passes through the hollow flange shaft and is fixed inside the hollow flange shaft through a gland. Both ends of the rotating shaft are connected to bearings, one end of the rotating shaft is connected to a center nut, and the head of the rotating shaft is connected to a limited baffle;

The expansion ring assembly includes a base plate, a guide rail, an outer arc block, an inner arc block and a wedge slider. The base plate is provided with a guide rail. The guide rail is provided with outer arc blocks and inner arc blocks at intervals. The rear end of the inner arc block is connected with The wedge slider I is connected to the wedge slider II at the rear of the outer arc block.
A double-angle wedge slider expansion ring according to claim 1, characterized in that: the center nut is tapered, a trapezoidal thread is provided in the center, and first chute and third chute are provided on the outer conical surface at intervals along the bus direction. For the two chute, the inclination angle α of the first chute and the inclination angle β of the second chute are different in size, and the depth h1 of the first chute and the depth h2 of the second chute are different in size.
A double-angle wedge slider expansion ring according to claim 2, characterized in that: the wedge slider I is provided in the first slide groove, and the wedge slider II is provided in the second slide groove.
A double-angle wedge slider expansion ring according to claim 2, characterized in that the inclination angle α of the first chute is greater than the inclination angle β of the second chute.
A double-angle wedge slider expansion ring according to claim 1, characterized in that: the bottom plate is also connected to a sealing plate through a column, and the sealing plate is provided with positioning screws.
A double-angle wedge slider expansion ring according to claim 1, characterized in that: the outer circles of the outer arc block and the inner arc block are connected with welding leakage backing plates.
A double-angle wedge slider expansion ring according to claim 2, characterized in that: the inclination angle of the working surface of the wedge slider I is α, the inclination angle of the working surface of the wedge slider II is β, and the wedge slider I is convex. The height h of the block is equal to the depth h1 of the first chute, and the height h' of the wedge slide block II is smaller than the depth h2 of the second chute.