CN202006246U

CN202006246U - Pipe expander

Info

Publication number: CN202006246U
Application number: CN2011200584207U
Authority: CN
Inventors: 刘春熙
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-03-08
Filing date: 2011-03-08
Publication date: 2011-10-12
Anticipated expiration: 2021-03-08

Abstract

The utility model provides a pipe expander, which comprises a pull rod, an expanding head and a wedge, wherein one end of the expanding head sheathed on the pull rod can be stretched and closed, and the wedge is arranged at the front end of the pull rod and can cause the expanding head to be expanded when the pull rod is pulled. The pipe expander uses the inverse pull type pipe expanding technology and uses the principle that the expanding head can be stretched and closed when the wedge is stressed. When the pipe expanding is needed, the pipe expander is extended in the starting pipe expanding position in a metal pipe, the pull rod is pulled, the wedge causes the expanding head to be expanded, and the pipe expander is pulled outwards to achieve the purpose of pipe expanding. Due to the extensibility of metal, the inverse pull type pipe expanding technology can cause the length of the expanded metal pipe not to be shortened but even to be increased, the defects of the pipe expander in the background technology are overcome, and the pipe expanding cost is greatly reduced.

Description

Tube expander

Technical field

The utility model relates to the tube expansion technique field, relates in particular to a kind of tube expander.

Background technology

Tube expander is to be used for external diameter in the enlarged pipe when making and keeping in repair all kinds of container, makes tube-to-tube sheet connection contact site fluid-tight engagement, leak, leak gas to prevent pipe, and a kind of expanded joint instrument that can bearing certain pressure.Be widely used in freezing, the manufacturing and the maintenance of condenser, cooler, heat exchanger, boiler and other pressure vessel of industry such as petrochemical industry, electric power, shipbuilding, metallurgy.Can expand to various metal material pipes such as copper, aluminium, titanium, iron, stainless steels and close.

Present tube expander uses compression forced action type tube expansion technique, and as shown in Figure 1, tube expander 20 comprises ejector sleeve 21 and the fixed size that is arranged on ejector sleeve 21 tops bloated 22.Bloated 22 interior diameter that is greater than the metal tube 10 that expanded, when the needs expand tube, tube expander 20 is inserted from the porch of

metal tube

10,22 the interior diameter owing to expand greater than metal tube 10, therefore metal tube 10 is along with the progressive of tube expander 20 pushes, the interior diameter of metal tube 10 is extended, has realized expand tube.

Above-mentioned tube expander, the head size that expands is fixing, and begins expand tube from the metal tube porch, because metal is ductile, therefore, along with being compressed of metal tube, though its internal diameter is extended, metal tube length is also shortening.Therefore, in actual applications, metal tube need reserve the compressed amount of some length, and constant by the metal tube length behind the expand tube to guarantee, this has caused great waste, in today that the metal pipe material cost rises steadily, has increased the expand tube cost greatly.

The utility model content

For this reason, technical problem to be solved in the utility model is: a kind of tube expander is provided, makes and not only do not shortened even can also increase to some extent by the length of bloated metal tube, reduced the expand tube cost.

So the utility model provides a kind of tube expander, this tube expander comprises: but pull bar, the bloated head that is enclosed within the end opening and closing on the pull bar and the chock that is arranged on the pull bar front end, when spurring pull bar, the alliteration that expands can be opened.

Described chock and pull bar are structure as a whole.

Described chock is screwed onto the pull bar front end.

Perhaps, described chock is screwed onto the pull bar front end, and is spacing on pull bar by alignment pin.

End that can not opening and closing at the head that expands is used to limit the mobile position-limiting tube of head that expands when also being provided with when the pulling pull bar.

Further, described position-limiting tube is structure as a whole with the head that expands.

But described bloated head opening and closing one end be along tube wall at least 3 valve structures of equal angles distribution radially.

Tube expander described in the utility model uses pull-type tube expansion technique, by the stressed principle that makes an opening and closing of expanding of chock, when the needs expand tube, tube expander is extend into initial expand tube position in the metal tube, the pulling pull bar, the chock head that will expand opens, and is pulled outwardly tube expander, arrives the purpose of expand tube.This kind falls pull-type tube expansion technique, because the ductility of metal, makes the expanded length of metal tube not only not shorten even can also increase to some extent, overcome the drawback of tube expander described in the background technology, greatly reduces the expand tube cost.

Description of drawings

Structural representation when Fig. 1 is tube expander expand tube described in the background technology;

Fig. 2 is the schematic diagram of the described tube expander of the utility model embodiment;

Structural representation when Fig. 3 puts into metal tube for tube expander shown in Figure 2;

Structural scheme of mechanism when Fig. 4 begins expand tube for tube expander shown in Figure 2;

Fig. 5 is an A portion structure enlarged drawing among Fig. 4.

The specific embodiment

Below, in conjunction with the accompanying drawings the utility model is described in detail.

To shown in Figure 5, present embodiment provides a kind of tube expander 30 as Fig. 2, and this tube expander 30 comprises: but pull bar 31, be enclosed within end opening and closing on the pull bar 31 expand 33 and be arranged on pull bar 31 front ends, can be when pulling pull bar 31 with a chock of 33 distendings 34 that expands.

Wherein, chock 34 and pull bar 31 can be integrative-structures, also can be that chock 34 is enclosed within pull bar 31 front ends, and be spacing on pull bar 31 by alignment pin 35.Here, alignment pin 35 can be to be fixed on the pull bar 31, also can be that alignment pin is fixed on chock on the pull bar.Present embodiment adopts alignment pin 35 to be fixed on the pull bar 31.

Certainly, described chock can also be screwed onto pull bar front end (not indicating among the figure), and perhaps, further described chock is screwed onto the pull bar front end, and spacing on pull bar by alignment pin.

When not spurring

pull bar

31,33 closure that expand are when expand tube, tube expander 30 during bloated closure extend in the metal tube 10, the head that expands is rested on the original position that needs expand tube, then pull bar is pulled outward, promptly draw pull bar 31, chock 34 can be inserted in bloated 33, make bloated 33 to open, metal tube 10 is opened by open bloated alliteration, as 101 positions of metal tube among Fig. 5 10, along with being drawn out of tube expander 30, metal tube 10 is by expand tube.

When preventing to draw pull bar 31, limiting bloated 33 moves on pull bar 31, on pull bar 31, can be provided with and when the pulling pull bar, prevent to expand the mobile screw of head (indicating among the figure), can also expand 33 can not opening and closing an end setting be used to limit bloated 33 position-limiting tube that move 32 during when the pulling pull bar, this position-limiting tube 32 also is enclosed within on the pull bar 31.Position-limiting tube 32 can be two different parts that separate with bloated 33, also can be integrative-structure.

But above-mentioned bloated head opening and closing one end can be that for example 3 to 24 valve structures are perhaps more along tube wall at least 3 valve structures that distribute of equal angles radially, and the present embodiment head that expands is 6 valve structures.

In sum, the described tube expander 30 of present embodiment, use pull-type tube expansion technique, by the chock 34 stressed principles that make 33 opening and closing of expanding, when the needs expand tube, tube expander 30 is extend into initial expand tube position in the metal tube, pulling pull bar 31, chock 34 will expand and 33 open, and be pulled outwardly tube expander 30, arrive the purpose of expand tube.This kind falls pull-type tube expansion technique, because the ductility of metal, make and not only do not shortened even can also increase to some extent by the length of bloated metal tube, having overcome tube expander 20 described in the background technology only can insert from the arrival end of metal tube 10, along with being compressed of metal tube, though its internal diameter is extended, the drawback that metal tube length is also shortening, as seen, the described tube expander 30 of present embodiment greatly reduces the expand tube cost.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims

1. a tube expander is characterized in that, but the chock that comprises pull bar, is enclosed within the bloated head of the end opening and closing on the pull bar and is arranged on the pull bar front end, when the pulling pull bar, the alliteration that expands can be opened.

2. tube expander according to claim 1 is characterized in that described chock and pull bar are structure as a whole.

3. tube expander according to claim 1 is characterized in that described chock is enclosed within the pull bar front end, and is spacing on pull bar by alignment pin.

4. tube expander according to claim 1 is characterized in that described chock is screwed onto the pull bar front end.

5. tube expander according to claim 4 is characterized in that described chock is screwed onto the pull bar front end, and is spacing on pull bar by alignment pin.

6. tube expander according to claim 1 is characterized in that, a end that can not opening and closing at the head that expands is used to limit the mobile position-limiting tube of head that expands when also being provided with when the pulling pull bar.

7. tube expander according to claim 6 is characterized in that, described position-limiting tube is structure as a whole with the head that expands.

8. tube expander according to claim 1 is characterized in that, but described bloated head opening and closing one end be along tube wall at least 3 valve structures of equal angles distribution radially.