CN111745946A - Small-caliber thick-wall heat-shrinkable tube expanding die and expanding system thereof - Google Patents
Small-caliber thick-wall heat-shrinkable tube expanding die and expanding system thereof Download PDFInfo
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- CN111745946A CN111745946A CN202010491826.8A CN202010491826A CN111745946A CN 111745946 A CN111745946 A CN 111745946A CN 202010491826 A CN202010491826 A CN 202010491826A CN 111745946 A CN111745946 A CN 111745946A
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- 238000004513 sizing Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims description 32
- 239000000498 cooling water Substances 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000009969 flowable effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/02—Thermal shrinking
- B29C61/025—Thermal shrinking for the production of hollow or tubular articles
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a small-caliber thick-wall heat shrinkable tube positive pressure expansion die and an expansion system thereof, wherein the expansion die comprises a die butt flange, an exhaust tube core, an expansion tube core and a sizing tube core which are fixedly communicated in sequence; an exhaust tube core outer sleeve is sleeved outside the exhaust tube core, an exhaust through hole for exhausting is formed in the exhaust tube core outer sleeve, an expansion tube core outer sleeve is sleeved outside the expansion tube core, and an inflation hole is formed in the expansion tube core outer sleeve; a pressure maintaining cavity is defined between the outer sleeve of the expansion pipe core and the expansion pipe core, and a plurality of small exhaust holes are formed in the position of the exhaust pipe core, which is surrounded by the outer sleeve of the exhaust pipe core; and a plurality of pressure maintaining small holes are formed at the positions of the expanding tube core, which are surrounded by the outer sleeve of the expanding tube core. The invention can reduce contact friction and even avoid contact friction between the heat shrinkable tube and the inner wall of the tube of the expansion tube core, so that the heat shrinkable tube can keep lower wall offset rate, stable longitudinal shrinkage rate and smooth appearance.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of machine manufacturing, in particular to an expansion die and an expansion system for a small-caliber thick-wall heat shrinkable tube.
[ background of the invention ]
At present, a heat shrinkable tube expansion system comprises a conveying device, a heating furnace, an expansion device, a cooling device and a traction device, wherein a small-caliber heat shrinkable tube expansion device generally adopts a negative pressure mode, namely, a vacuum is pumped in an expansion mould to cause negative pressure, so that a heat shrinkable tube is expanded; in the negative pressure expansion, the expansion mold is usually set to slightly leak air to properly reduce the vacuum degree, so as to prevent the problem of large longitudinal shrinkage rate of the heat shrinkable tube caused by over-tight adhesion between the heat shrinkable tube and the inner wall of the expansion mold. However, for a thick-wall heat-shrinkable tube with a small diameter and a high magnification, the expansion finished product is seriously deviated from the wall due to the uneven local vacuum degree generated by air leakage in negative pressure expansion, the longitudinal shrinkage rate is unstable, and the expansion speed can only be controlled at an extremely low level.
[ summary of the invention ]
In order to solve one or more of the problems, the invention provides a positive pressure expansion die suitable for a small-caliber thick-wall heat-shrinkable tube and an expansion system thereof, wherein the expansion speed of the small-caliber thick-wall heat-shrinkable tube can be increased by 1-4 times according to different expansion multiplying powers in a positive pressure expansion mode of introducing compressed air into the heat-shrinkable tube, the longitudinal shrinkage rate and the deflection rate can be stably controlled within a qualified range, and the expansion rate is obviously improved compared with negative pressure expansion.
In order to achieve the purpose, the small-caliber thick-wall heat shrinkable tube expansion die provided by the invention comprises a die butt flange, an exhaust tube core, an expansion tube core and a sizing tube core which are fixedly communicated in sequence; an exhaust tube core outer sleeve is sleeved outside the exhaust tube core, an exhaust through hole for exhausting is formed in the exhaust tube core outer sleeve, an expansion tube core outer sleeve is sleeved outside the expansion tube core, and an inflation hole is formed in the expansion tube core outer sleeve; a pressure maintaining cavity is defined between the outer sleeve of the expansion pipe core and the expansion pipe core, and a plurality of small exhaust holes are formed in the position of the exhaust pipe core, which is surrounded by the outer sleeve of the exhaust pipe core; and a plurality of pressure maintaining small holes are formed in the positions of the expansion pipe cores, which are surrounded by the expansion pipe core outer sleeves.
In a preferred embodiment, the exhaust pipe core outer sleeve is provided with a sealing ring at the position connected with the exhaust pipe core, and the expansion pipe core outer sleeve is provided with a sealing ring at the position connected with the expansion pipe core.
In a preferred embodiment, the inner diameter of the expanding tube core is larger than that of the sizing tube core, the inner diameter of the sizing tube core is larger than or equal to that of the exhaust tube core, and the inner hole diameter of the mold butting flange is 1-4 mm larger than the outer diameter of the unexpanded heat shrinkable tube.
In order to achieve the above purpose, the invention further provides a small-caliber thick-wall heat shrinkable tube expanding system, which comprises the expanding mold, a heating cylinder at the inlet end of the expanding mold, a cooling water tank at the outlet end of the expanding mold, and a tube conveying wheel and a traction wheel which are respectively used for conveying and traction the heat shrinkable tube; the tail end of the heat shrink tube is connected with a third inflation device, the heating cylinder is provided with a first inflation device, and the expansion die is connected with a second inflation device through an inflation hole.
In a preferred embodiment, the expansion die tip is inclined downwardly and the heating cartridge is oriented axially at an angle of less than 180 °. The tail end of the expansion mould is inclined downwards, so that the heat shrinkable tube can be cooled and shaped after coming out of the expansion mould and then inclined downwards to enter a cooling water tank at a certain angle, and the arrangement of the inclined angle prevents cooling water from flowing backwards into the expansion mould.
In a preferred embodiment, the expansion die is fixedly connected with the heating cylinder through the die butt flange, a sizing tube core of the expansion die is directly contacted with cooling water of the cooling water tank, and the liquid level of the cooling water covers the inner upper wall of the sizing tube core.
In a preferred embodiment, the heating cartridge is a fully sealed heating oil tank.
According to the small-caliber thick-wall heat shrinkable tube expanding die and the expanding system thereof, the third inflating device inflates compressed air into the heat shrinkable tube to make the air pressure in the heat shrinkable tube uniform, the gas is inflated into the pressure maintaining cavity between the outer sleeve of the expanding tube core and the expanding tube core through the inflating hole, the gas in the pressure maintaining cavity is communicated with the gas in the tube cavity in the expanding tube core through the pressure maintaining hole to form a flowable state, the gas in the cavity filled with the heat shrinkable tube and the gas in the tube cavity of the expanding tube core form pressure balance, and the pressure balance can reduce contact friction or even avoid contact friction between the heat shrinkable tube and the tube inner wall of the expanding tube core while the heat shrinkable tube is expanded, so that the heat shrinkable tube can keep a low partial wall rate, a stable longitudinal shrinkage rate and a smooth appearance.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a positive pressure expanding mold for a small-caliber thick-wall heat shrinkable tube according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a positive pressure expanding system for small-caliber thick-wall heat shrinkable tubes according to a preferred embodiment of the present invention;
the reference numbers illustrate: the device comprises an expansion die 10, a die butt flange 11, an exhaust tube core 12, an exhaust tube core outer sleeve 13, an exhaust small hole 121, an exhaust through hole 131, an exhaust cavity 132, an expansion tube core 14, an expansion tube core outer sleeve 15, a pressure maintaining small hole 141, an inflation hole 151, a pressure maintaining cavity 152, a sizing tube core 16, a sealing ring 17, a heat shrinkable tube 20, a tube conveying wheel 30, a heating cylinder 40, a first inflation device 50, a second inflation device 60, a cooling water tank 70, a traction wheel 80, a third inflation device 90, cooling water 71 and hot oil 41.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantageous effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, the small-diameter thick-wall heat shrinkable tube positive pressure expanding system of the present invention includes an expanding mold 10, a heating cylinder 40 at an inlet end of the expanding mold 10, a cooling water tank 70 at an outlet end of the expanding mold 10, and a tube delivery wheel 30 and a traction wheel 80 for delivering and pulling the heat shrinkable tube 20, respectively; the production process of heating softening, expanding, cooling and shaping of the heat shrinkable tube is realized.
The end of the heat shrinkable tube 20 is connected with a third inflation device 90, and compressed air with set pressure is introduced through the third inflation device 90 to expand the heat shrinkable tube 20, so that positive pressure expansion of the heat shrinkable tube 20 is realized; the positive pressure expansion process enables the interior of the heat shrinkable tube 20 to be uniformly filled with compressed air, and ensures the lower partial wall rate of the expanded finished product of the heat shrinkable tube 20; the heating cylinder 40 is provided with a first inflation device 50, and compressed air with set pressure is introduced into the heating cylinder 40 through the first inflation device 50, so that the pressure intensity in the heating cylinder 40 is kept consistent with the pressure intensity in the heat shrinkable tube 20, and the heat shrinkable tube 20 is prevented from being expanded in the heating cylinder 40 in advance.
Preferably, the end of the expansion die 10 is inclined downward at an angle of less than 180 ° with respect to the axial direction of the heating cylinder 40, and the inclined angle prevents the cooling water 71 from flowing backward into the expansion die 10.
Further, the expansion die 10 is fixedly connected with the heating cylinder 40 through the die butting flange 11, the sizing tube core 16 of the expansion die 10 is directly contacted with the cooling water 71 of the cooling water tank 70, the liquid level of the cooling water 71 covers the inner upper wall of the sizing tube core 16, so that the heat shrinkable tube directly enters the cooling water tank 70 to be cooled and shaped after coming out of the expansion die 10, and the cooling water 71 completely covers the heat shrinkable tube 20 to ensure the sufficient cooling of the heat shrinkable tube 20.
Further, the heating cylinder 40 is a fully sealed heating oil tank, so that after compressed air with a set pressure is introduced into the heating cylinder 40 through the first inflation device 50, the pressure inside the heating cylinder 40 can be easily kept equivalent to the pressure inside the heat shrink tube.
Further, the small-caliber thick-wall heat shrinkable tube positive pressure expansion die 10 comprises a die butt flange 11, an exhaust tube core 12, an expansion tube core 14 and a sizing tube core 16 which are fixedly communicated in sequence.
Further, an exhaust tube core outer sleeve 13 is sleeved outside the exhaust tube core 12, an exhaust cavity 132 is defined between the exhaust tube core outer sleeve 13 and the exhaust tube core 12, and an exhaust through hole 131 for exhausting is formed in the exhaust tube core outer sleeve 13; an expansion pipe core outer sleeve 15 is sleeved outside the expansion pipe core 14, a pressure-maintaining cavity 152 is defined between the expansion pipe core outer sleeve 15 and the expansion pipe core 14, and an inflation hole 151 is formed in the expansion pipe core outer sleeve 15; the inflation hole 151 allows compressed air of a set pressure to be introduced into the expanded wick jacket 15 through the second inflation device 60, reducing the frictional force between the outer surface of the heat shrinkable tube 20 and the inner wall of the expanded wick 14, so that the heat shrinkable tube 20 can maintain a stable longitudinal shrinkage rate and a smooth appearance.
Preferably, a plurality of exhaust small holes 121 are formed in the position of the exhaust pipe core 12 surrounded by the exhaust pipe core outer sleeve 13, so that the inside of the exhaust pipe core 12 is communicated with the exhaust cavity 132; the position of the expanded pipe core 14 surrounded by the expanded pipe core outer sleeve 15 is provided with a plurality of pressure maintaining small holes 141, so that the inside of the expanded pipe core 14 is communicated with the pressure maintaining cavity 152.
Furthermore, a sealing ring 17 is arranged at the position where the exhaust tube core outer sleeve 13 is connected with the exhaust tube core 12, so that the sealing effect of two ends of the exhaust cavity is better, and exhausted compressed air can directionally reach the exhaust through hole 131; the expansion pipe core outer sleeve 15 is provided with a sealing ring 17 at the position connected with the expansion pipe core 14, and the sealing ring 17 is arranged to ensure that the pressure maintaining cavity has better sealing performance.
Specifically, the inner diameter of the expansion pipe core 14 is larger than the inner diameter of the sizing pipe core 16, the inner diameter of the sizing pipe core 16 is larger than or equal to the inner diameter of the exhaust pipe core 12, and the inner hole diameter of the mold butting flange 11 is 1-4 mm larger than the outer diameter of the unexpanded heat shrinkable tube 20. So that the unexpanded heat shrinkable tube 20 can easily enter the expansion die 10 to be expanded.
Specifically, each inflation device sets a pressure value relationship as follows: the first inflator 50 is greater than or equal to the third inflator 90 is greater than or equal to the second inflator 60. The setting of the first inflator 50 to the heater cartridge is equal to or slightly greater than the setting of the third inflator 90 to the inside of the heat shrinkable tube, ensuring that the heat shrinkable tube 20 does not expand prematurely in the heater cartridge 40; the setting of the second inflation means 60 to the expansion die is equal to or slightly less than the setting of the third inflation means 90 to the interior of the heat shrink tubing to ensure that the internal pressure of the heat shrink tubing 20 is greater than the external pressure within the expanded tubular core 14 to enable positive pressure expansion.
When the small-caliber thick-wall heat-shrinkable tube expanding system works, the heat-shrinkable tube 20 enters the heating cylinder 40 for heating under the conveying of the tube conveying wheel 30, the heated heat-shrinkable tube 20 enters the expanding die 10 for expanding, the expanded heat-shrinkable tube 20 enters the cooling water tank 70 for cooling under the traction of the traction wheel 80, and the process can be completed after cooling.
The third inflation device 90 inflates the compressed air into the heat shrinkable tube 20 to realize positive pressure expansion of the heat shrinkable tube 20, and the first inflation device 50 delivers the compressed air into the heating cylinder 40, so that the heat shrinkable tube 20 is not expanded in advance in the heating cylinder 40; the small exhaust holes 121 on the surface of the exhaust tube core 16 and the exhaust through holes 121 on the outer sleeve 13 of the exhaust tube core discharge the compressed air filled in the heating cylinder 40 to the outside so as to avoid the failure of expansion caused by the existence of gas; compressed air is introduced into the outer sheath 15 of the expanded tubular core by the second air-filling means 60 to reduce the friction between the outer surface of the heat shrinkable tube 20 and the inner wall of the expanded tubular core 14, so that the heat shrinkable tube 20 can maintain a stable longitudinal shrinkage rate and a smooth appearance.
The expanding die and the expanding system for the small-caliber thick-wall heat-shrinkable tube can realize positive pressure expansion of the small-caliber thick-wall heat-shrinkable tube, and ensure stable longitudinal shrinkage and wall deflection rate of a product while not reducing production speed.
During expansion, the third inflator 90 fills compressed air into the heat shrinkable tube 20 to maintain uniform air pressure inside the heat shrinkable tube 20, the second inflator 60 fills gas into the pressure maintaining chamber 152 between the expanded tube core sleeve 15 and the expanded tube core 14 through the inflation hole 151, the gas inside the pressure maintaining chamber 152 is communicated with the tube cavity gas inside the expanded tube core 14 through the pressure maintaining small hole 141 to form a flowable state, and the inner cavity gas filled in the heat shrinkable tube 20 and the gas inside the tube cavity of the expanded tube core 14 form pressure balance, the pressure balance can reduce or even eliminate contact friction between the heat shrinkable tube 20 and the tube inner wall of the expanded tube core 14 when the heat shrinkable tube 20 expands, and simultaneously, the heat shrinkable tube 20 can maintain a low partial wall ratio, a stable longitudinal shrinkage ratio and a smooth appearance due to uniform distribution of the air pressure inside the heat shrinkable tube 20.
According to the invention, by adopting a positive pressure expansion mode of introducing compressed air into the heat shrinkable tube, the expansion speed of the small-caliber thick-wall heat shrinkable tube can be increased by 1-4 times according to different expansion multiplying powers, and the longitudinal shrinkage rate and the wall deflection rate can be stably controlled within a qualified range.
The invention is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.
Claims (8)
1. A small-caliber thick-wall heat shrinkable tube expansion die is characterized by comprising a die butt flange, an exhaust tube core, an expansion tube core and a sizing tube core which are fixedly communicated in sequence; an exhaust tube core outer sleeve is sleeved outside the exhaust tube core, an exhaust through hole for exhausting is formed in the exhaust tube core outer sleeve, an expansion tube core outer sleeve is sleeved outside the expansion tube core, and an inflation hole is formed in the expansion tube core outer sleeve; a pressure maintaining cavity is defined between the outer sleeve of the expansion pipe core and the expansion pipe core, and a plurality of small exhaust holes are formed in the position of the exhaust pipe core, which is surrounded by the outer sleeve of the exhaust pipe core; and a plurality of pressure maintaining small holes are formed in the positions of the expansion pipe cores, which are surrounded by the expansion pipe core outer sleeves.
2. The expanding die for the small-caliber thick-wall heat shrinkable tube as claimed in claim 1, wherein a sealing ring is arranged at a position where the exhaust tube core outer sleeve is connected with the exhaust tube core.
3. The expanding die for the small-caliber thick-wall heat shrinkable tube as claimed in claim 1, wherein a sealing ring is arranged at a position where the expanding tube core outer sleeve is connected with the expanding tube core.
4. The expanding die for the small-caliber thick-wall heat shrinkable tube as claimed in claim 1, wherein the inner diameter of the expanding tube core is larger than that of the sizing tube core, the inner diameter of the sizing tube core is larger than that of the exhaust tube core, and the inner diameter of the abutting flange of the die is 1-4 mm larger than the outer diameter of the unexpanded heat shrinkable tube.
5. An expansion system of a small-caliber thick-wall heat shrinkable tube, which is characterized by comprising the expansion die, a heating cylinder at the inlet end of the expansion die, a cooling water tank at the outlet end of the expansion die, and a tube conveying wheel and a traction wheel which are respectively used for conveying and traction the heat shrinkable tube, wherein the heating cylinder is arranged at the inlet end of the expansion die; the tail end of the heat shrink tube is connected with a third inflation device, the heating cylinder is provided with a first inflation device, and the expansion die is connected with a second inflation device through the inflation hole.
6. The small-caliber thick-wall heat shrinkable tube expanding system as claimed in claim 5, wherein the expanding die tip is inclined downward and has an angle of less than 180 ° with the axial direction of the heating cylinder.
7. The system for expanding the small-caliber thick-wall heat shrinkable tube as claimed in claim 5, wherein the expanding die is fixedly connected with the heating cylinder through the die butting flange, a sizing tube core of the expanding die is in direct contact with cooling water of the cooling water tank, and the liquid level of the cooling water covers the inner upper wall of the sizing tube core.
8. The small-caliber thick-wall heat shrinkable tube expanding system of claim 5, wherein the heating cylinder is a fully sealed heating oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010491826.8A CN111745946A (en) | 2020-06-03 | 2020-06-03 | Small-caliber thick-wall heat-shrinkable tube expanding die and expanding system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010491826.8A CN111745946A (en) | 2020-06-03 | 2020-06-03 | Small-caliber thick-wall heat-shrinkable tube expanding die and expanding system thereof |
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| CN111745946A true CN111745946A (en) | 2020-10-09 |
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| CN202010491826.8A Pending CN111745946A (en) | 2020-06-03 | 2020-06-03 | Small-caliber thick-wall heat-shrinkable tube expanding die and expanding system thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102079132A (en) * | 2009-11-27 | 2011-06-01 | 深圳市宏商材料科技股份有限公司 | Positive pressure continuous expanding method and device of heat shrinkable pipe |
| CN102211406A (en) * | 2011-05-30 | 2011-10-12 | 长园集团股份有限公司 | Positive-pressure expanding machine for heat-shrinkable pipe |
| CN202213200U (en) * | 2011-08-12 | 2012-05-09 | 大连联合高分子材料有限公司 | Thermal shrinkable pipe expanding mould and expanding device using same |
| CN103722643A (en) * | 2014-01-15 | 2014-04-16 | 长园电子（集团）有限公司 | Expanding mould of heat shrinking pipe |
| CN104494136A (en) * | 2014-11-05 | 2015-04-08 | 深圳市沃尔核材股份有限公司 | Expanding die |
| CN205735986U (en) * | 2016-06-30 | 2016-11-30 | 乐清市华仪电缆附件有限公司 | Thermal-shrinkage tube expanding machine |
| CN212400343U (en) * | 2020-06-03 | 2021-01-26 | 上海核工程研究设计院有限公司 | Small-caliber thick-wall heat-shrinkable tube expanding die and expanding system thereof |
-
2020
- 2020-06-03 CN CN202010491826.8A patent/CN111745946A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102079132A (en) * | 2009-11-27 | 2011-06-01 | 深圳市宏商材料科技股份有限公司 | Positive pressure continuous expanding method and device of heat shrinkable pipe |
| CN102211406A (en) * | 2011-05-30 | 2011-10-12 | 长园集团股份有限公司 | Positive-pressure expanding machine for heat-shrinkable pipe |
| CN202213200U (en) * | 2011-08-12 | 2012-05-09 | 大连联合高分子材料有限公司 | Thermal shrinkable pipe expanding mould and expanding device using same |
| CN103722643A (en) * | 2014-01-15 | 2014-04-16 | 长园电子（集团）有限公司 | Expanding mould of heat shrinking pipe |
| CN104494136A (en) * | 2014-11-05 | 2015-04-08 | 深圳市沃尔核材股份有限公司 | Expanding die |
| CN205735986U (en) * | 2016-06-30 | 2016-11-30 | 乐清市华仪电缆附件有限公司 | Thermal-shrinkage tube expanding machine |
| CN212400343U (en) * | 2020-06-03 | 2021-01-26 | 上海核工程研究设计院有限公司 | Small-caliber thick-wall heat-shrinkable tube expanding die and expanding system thereof |
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