CN106216537A - A shape memory alloy reducing pipe joint diameter expanding device - Google Patents

Abstract

The invention discloses a diameter expansion device for a shape memory alloy reducer pipe joint, comprising: a base, a guide sleeve, an expansion pressure rod and a petal expansion block; a sleeve guide hole extending longitudinally is preset at the upper end of the base; the guide sleeve is fitted in the sleeve guide hole; a push rod guide hole extending longitudinally is processed at the center of the guide sleeve; the expansion pressure rod is a reducer cylindrical rod body, the lower part of which is processed into a guide section with a smaller diameter, the middle transition part is processed into a conical expansion section, the upper part of the conical expansion section is processed into a retaining section with a larger diameter, and the upper part of the retaining section is processed into a sleeve removal section with a diameter smaller than that of the retaining section; the petal expansion block is a fan-shaped block that evenly divides a circular ring, and the number of divisions is greater than or equal to 2; the petal expansion block is embedded in the large diameter part of the shape memory alloy reducer pipe joint; the invention realizes overall diameter expansion by gradually pressing down the expansion pressure rod to cause the conical expansion section and the retaining section to act on the petal expansion block inside the small diameter part and the large diameter part of the shape memory alloy reducer pipe joint in turn.

Description

A shape memory alloy reducing pipe joint diameter expanding device

technical field

The invention relates to a mechanical diameter expanding device, in particular to a diameter expanding device of a shape memory alloy variable diameter pipe joint.

Background technique

Shape memory alloy is a metal functional material with shape memory effect, and pipe joint is one of its successful applications.

The shape memory alloy variable diameter pipe joint can connect two pipelines with different diameters, which is different from the traditional electric welding and threaded connection. The shape memory alloy variable diameter pipe joint is formed by superimposing two cylindrical sleeves, including the small end and the large end. It is machined in the parent phase state, and its inner diameter is slightly smaller than the outer diameter of the connected parts. In application, the shape memory alloy variable diameter pipe joint is cooled to the martensitic state, and the diameter of the variable diameter pipe joint is expanded by mechanical force, so that the inner diameter of the small end and the large end of the enlarged variable diameter pipe joint are greater than the outer diameter of the connected pipe. slightly larger. Assemble the connected pipe and the variable-diameter pipe joint together at low temperature, and then heat the assembled shape-memory alloy variable-diameter pipe joint to a certain temperature, so that the phase change of the shape-memory alloy variable-diameter pipe joint occurs. Due to the shape memory effect, it returns to the size before deformation, but in the process of shape recovery, due to the restriction of the connected pipe, it produces a constraint force, so that the two pipelines are tightly connected together.

The shape memory alloy reducing pipe joint has the advantages of reliable connection, simple connection process, small size of the pipe joint, and corrosion resistance. At present, the design and diameter expansion of shape memory alloy reducing pipe joints have not been seen so far.

Contents of the invention

Aiming at the above technical problems, the present invention proposes a diameter-expanding device for shape-memory alloy variable-diameter pipe joints.

In order to achieve the above purpose, it is realized through the following technical solutions:

A diameter-expanding device for a shape-memory alloy variable-diameter pipe joint, comprising: a base, a guide bush, a diameter-expanding pressing rod, and a split-type expanding block;

The upper end of the base is preset with a shaft sleeve guide hole extending longitudinally;

The guide bush is fitted in the guide hole of the bush, and the height of the guide bush is equal to the depth of the guide hole of the bush;

The expansion pressure rod is a variable diameter cylindrical rod body, the lower part of which is processed into a guide section with a smaller diameter, the middle transition part is processed into a conical reaming section, and the upper part of the conical reaming section is processed into a larger diameter holding section. Processed into a sleeve-unloading section whose diameter is smaller than that of the retaining section;

The center of the guide bushing is processed with a longitudinally extending push rod guide hole, wherein the push rod guide hole is a stepped hole structure with the upper hole diameter larger than the lower hole diameter, the diameter of the large hole part is greater than or equal to the diameter of the holding section of the expanding pressure rod, and the small hole part is the same as The large aperture part transitions through the tapered surface;

The split-type expansion block is a fan-shaped block that divides the ring evenly, and the number of divisions is greater than or equal to 2;

Among them, the split-type expansion block is embedded in the large-diameter part of the memory alloy variable-diameter pipe joint, and the memory alloy variable-diameter pipe joint equipped with the split-type expansion block is buckled on the upper end of the base, and is longitudinally aligned with the guide shaft sleeve. The shaft is placed; the guide section of the expansion pressure rod passes through the small diameter part of the memory alloy variable diameter pipe joint and the large diameter part of the memory alloy variable diameter pipe joint with a split expansion block, and finally extends into the guide hole of the push rod In the hole of the small diameter part of the lower part;

In the present invention adopting the above-mentioned technical solution, the upper end of the expanded pressure rod is connected to the output shaft of the press, and through the downward pressure of the press, the guide section of the expanded diameter pressure rod will first enter into the lower small diameter part of the push rod guide hole to realize alignment and guidance , and then further press down the conical reaming section of the expansion rod to expand the small diameter part of the memory alloy variable diameter pipe joint, and continue to press down the conical reaming section of the expansion rod to act on the split expansion block The radial outward expansion realizes the expansion of the large-diameter part of the memory alloy variable-diameter pipe joint, and the continuous downward pressure realizes stable expansion through the holding section, and finally reaches the unloading section, and the memory alloy variable-diameter pipe joint can be removed after loosening.

Further, the diameter of the small diameter part of the lower part of the guide hole of the push rod of the guide bush is equal to the diameter of the guide section of the expanding pressure rod, so as to ensure stable longitudinal guidance.

Further, the base is located at the bottom of the guide hole of the shaft sleeve to process an extended guide hole with a diameter greater than or equal to the guide section of the expanding pressure rod, in order to further provide a downward stroke.

Further, the diameter of the guide section of the expanding pressure rod is D ₀ , the length of the conical reaming section is L, the cone angle of the conical reaming section is α, and the diameter of the holding section is 2Ltan(α/2)+D ₀ .

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

The present invention has 6 drawings in total, wherein:

Fig. 1 is a schematic structural view of a diameter expanding device of the present invention;

Fig. 2 is a schematic diagram of the diameter expansion process of the diameter expansion device of the present invention;

Fig. 3 is the structure schematic diagram of reducing pipe joint of the present invention;

Fig. 4 is a schematic diagram of a base of the present invention;

Fig. 5 is a schematic diagram of a guide bushing of the present invention;

Fig. 6 is a schematic diagram of the split-type expansion block of the present invention.

In the figure: 1. Variable diameter pipe joint, 1-1, large diameter part of memory alloy variable diameter pipe joint, 1-2, small diameter part of memory alloy variable diameter pipe joint, 2, base, 2-1, shaft sleeve guide hole , 3, guide bushing, 3-1, push rod guide hole, 4, expanding pressure rod, 4-1, tapered reaming section, 4-2, holding section, 4-3, guiding section, 4-4 , unloading section, 5, split-type expansion block.

detailed description

A diameter-expanding device for a shape-memory alloy variable-diameter pipe joint as shown in Figures 1 to 6, comprising: a base 2, a guide bush 3, a diameter-expanding pressing rod 4, and a split-type expanding block 5;

The upper end of the base 2 is preset with a longitudinally extending sleeve guide hole 2-1;

The guide bush 3 is assembled in the bush guide hole 2-1, and the height of the guide bush 3 is equal to the depth of the bush guide hole 2-1;

Expanding pressure rod 4 is a variable-diameter cylindrical rod body, the lower part of which is processed into a guide section 4-3 with a smaller diameter, the middle transition part is processed into a conical reaming section 4-1, and the upper part of the conical reaming section 4-1 is processed into The retaining section 4-2 with a larger diameter, the upper part of the retaining section 4-2 is processed into an unloading section 4-4 whose diameter is smaller than that of the retaining section 4-2;

The center of the guide bush 3 is processed with a longitudinally extending push rod guide hole 3-1, wherein the push rod guide hole 3-1 is a stepped hole structure with an upper hole diameter larger than the lower hole diameter, and the diameter of the large hole part is greater than or equal to that of the expanding pressure rod 4. The diameter of section 4-2, the small aperture part and the large aperture part transition through the tapered surface;

The split-type expansion block 5 is a fan-shaped block that evenly divides the ring, and the number of divisions is greater than or equal to 2;

Wherein, the split-type diameter-expanding block 5 is embedded in the large-diameter part 1-1 of the memory alloy variable-diameter pipe joint, and the memory alloy variable-diameter pipe joint 1 equipped with the split-type diameter-expanding block 5 is buckled on the upper end of the base 2, and It is placed coaxially with the guide bushing 3 in the longitudinal direction; the guide section 4-3 of the expansion pressure rod 4 passes through the small diameter part 1-2 of the memory alloy variable diameter pipe joint and the memory alloy variable diameter with split expansion block 5 in sequence. The large-diameter part 1-1 of the diameter pipe joint finally extends into the lower small-diameter part of the push rod guide hole 3-1;

Further, the diameter of the lower part of the small diameter part of the push rod guide hole 3-1 of the guide bushing 3 is equal to the diameter of the guide section 4-3 of the expanding pressure rod 4, so as to ensure stable longitudinal guidance.

Further, the base 2 is located at the bottom of the bushing guide hole 2-1 to process an extended guide hole with a diameter greater than or equal to the guide section 4-3 of the expanding pressure rod 4, in order to further provide a pressing stroke.

In the present invention adopting the above-mentioned technical solution, when expanding the diameter of the shape memory alloy variable diameter pipe joint 1 in this example, the split type expansion block 5 is first inserted into the large diameter part 1-1 of the variable diameter pipe joint, and then The guide bushing 3 is installed in the guide hole of the bushing where the base 2 and the guide bushing 3 are in clearance fit according to the downward position of the pressure rod guide hole 3-1, and the reducing pipe joint 1 is assembled with the split expansion block 5 After completion, install it on the upper end surface of the guide bushing 3 according to the requirement that the big end is downward, so that the axis of the variable diameter pipe joint 1 coincides with the axis of the guide bushing 3, and then pass the guide section 4-3 of the expanding pressure rod 4 through the variable diameter pipe joint 1. In the diameter pipe joint 1 and the pressure rod guide hole 3-1, under the action of the press, the diameter expansion pressure rod pushes down along the pressure rod guide hole 3-1, when the diameter expansion pressure rod taper reaming section 4- 1 When entering the small-diameter part 1-2 of the variable-diameter pipe joint, the small-diameter part 1-2 of the variable-diameter pipe joint expands evenly in the radial direction. The overall diameter of the pipe joint is expanded to reduce the elastic contraction of the pipe joint. When the tapered reaming section 4-1 of the expanding pressure rod is pressed to the large diameter part 1-1 of the variable diameter pipe joint, the split expansion block 5 radially Uniform expansion, because the outer wall of the split-type expansion block 5 acts on the inner wall of the large-diameter part 1-1 of the variable-diameter pipe joint, so that the large-diameter part 1-1 of the variable-diameter pipe joint expands evenly. Expanding pressure rod 4 continues to push downward under pressure, holding section 4-2 enters guide bushing 3 (unloading section 4-4 descends to part 5 of split-type expanding block), shape memory alloy reducing pipe joint 1 It can be released from the diameter expansion pressure rod 4 after being relaxed, and the split type diameter expansion block 5 is taken out to complete the diameter expansion of a shape memory alloy variable diameter pipe joint 1 .

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Without departing from the scope of the technical solution of the present invention, the skilled person can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes. Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solutions of the present invention.

Claims (3)

1. a marmem reduction nipple expander, it is characterised in that: include, pedestal (2), guideway (3), Expanding depression bar (4) and expanding piece of split-type (5)；

Described pedestal (2) upper end is preset with the axle sleeve pilot hole (2-1) of longitudinal extension；

In described guideway (3) is assemblied in axle sleeve pilot hole (2-1), and guideway (3) height and axle sleeve pilot hole (2-1) Deep equality；

Described expanding depression bar (4) is the reducing cylinder body of rod, and its underpart is processed as the less guide section of diameter (4-3), middle part transition Part is processed as tapered reaming section (4-1), and tapered reaming section (4-1) top is processed as the maintaining segment (4-2) being relatively large in diameter, and keeps Section (4-2) top is processed as diameter and overlaps section (4-4) less than unloading of maintaining segment (4-2)；

Described guideway (3) center is machined with the push rod pilot hole (3-1) of longitudinal extension, and wherein push rod pilot hole (3-1) is Aperture, top is more than the shoulder hole structure in aperture, bottom, and large aperture section diameter is more than or equal to the maintaining segment (4-of expanding depression bar (4) 2) diameter, small-bore part and large aperture part pass through conical surface transition；

Expanding piece of described split-type (5) is the secter pat of average mark cyclotomy ring, and dividing number is more than or equal to 2；

Wherein, expanding piece of split-type (5) is embedded in memorial alloy reduction nipple large diameter portion (1-1), is equipped with split-type and expands The memorial alloy reduction nipple (1) of footpath block (5) is buckled on pedestal (2) upper end, and is longitudinally coaxial putting with guideway (3) Put；The guide section (4-3) of expanding depression bar (4) sequentially passes through memorial alloy reduction nipple path part (1-2) and with a point lobe Memorial alloy reduction nipple large diameter portion (1-1) of formula expanding piece (5), is finally inserted into the bottom of push rod pilot hole (3-1) In path partial hole.

A kind of marmem reduction nipple expander the most according to claim 1, it is characterised in that: the axis of guide The bottom path section diameter of the push rod pilot hole (3-1) of set (3) is equal to guide section (4-3) diameter of expanding depression bar (4).

A kind of marmem reduction nipple expander the most according to claim 1 and 2, it is characterised in that: institute State pedestal (2) and be positioned at the extension more than or equal to expanding depression bar (4) guide section (4-3) of axle sleeve pilot hole (2-1) the bottom processing diameter Pilot hole.