CN109732501B - Cold-mounting method for connecting pipe - Google Patents
Cold-mounting method for connecting pipe Download PDFInfo
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- CN109732501B CN109732501B CN201811641987.XA CN201811641987A CN109732501B CN 109732501 B CN109732501 B CN 109732501B CN 201811641987 A CN201811641987 A CN 201811641987A CN 109732501 B CN109732501 B CN 109732501B
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Abstract
The invention discloses a connecting pipe cold-fitting method, which comprises the following steps: installing or preparing an auxiliary device; putting the connecting pipe to be cooled into an auxiliary device; placing the auxiliary device in the coolant; and after cooling, taking out the auxiliary device and carrying out cold charging. The method adopts the connecting pipe cold-charging auxiliary device which has a simple structure and is simple and convenient to operate in the connecting pipe cold-charging process, and the connecting pipe to be cold-charged can be smoothly taken out from the liquid nitrogen tank and assembled on a product by adopting the method, so that the method is convenient and rapid, the cold-charging time is shortened, the working efficiency is improved, and the cold-charging quality and the personal safety are ensured.
Description
Technical Field
The invention relates to an assembling method of a nuclear power product connecting pipe, in particular to a connecting pipe cold-assembling method.
Background
In nuclear power products, a voltage stabilizer is an important device for controlling pressure and protecting overpressure in a nuclear power generation system primary loop. The electric heater sleeve and the instrument connecting pipe on the cylinder body under the voltage stabilizer are assembled with products by interference fit at present.
Previously, as in the CPR1000 model stabilizer, the electrical heating sleeve and the meter adapter are assembled on the product by mechanical expansion. The pipe expander is used, and the expansion force of the pipe expander is used for expanding the connecting pipe and the base metal hole. Although the pipe is expanded, the inner wall of the connecting pipe is damaged by expansion joint, and the thickness of the base material is reduced. If the control is improper during operation, the non-swelling and over-swelling are easily caused.
The assembly of the current voltage stabilizer, such as an electrical heating sleeve of an HL1000-1 type voltage stabilizer, each instrument connecting pipe and a cylinder body adopts a cold-charging process. The mode avoids the thinning caused by mechanical damage to the connecting pipe, and the connecting pipe is perfectly expanded and closed with a product after being cooled to room temperature by manual assembly by utilizing the cold shrinkage of liquid nitrogen.
The traditional cold charging method is that one or more steel wires are connected with a connecting pipe, then the connecting pipe is placed in a liquid nitrogen bottle, the connecting pipe is taken out after being placed for 1 hour by lifting the steel wires with hands, the steel wires are twisted off by using pliers, the connecting pipe is taken out and then assembled, the temperature of liquid nitrogen is low, the rigidity of the steel wires is deteriorated after the steel wires are placed in the liquid nitrogen for too long time, and the weight of the connecting pipe is 1.7kg (single steel wire), so that the steel wires are easy to break. If the steel wire just breaks off when being taken out, the connecting pipe can fall into the bottom of the liquid nitrogen tank, and simultaneously liquid nitrogen splashes around, so that people can be scalded when the connecting pipe contacts with the liquid nitrogen tank, and the connecting pipe is extremely dangerous.
In view of the problems, the traditional cold-fitting clamping method is improved, and the connecting pipe cold-fitting method is designed, so that the connecting pipe can be taken out of the liquid nitrogen tank smoothly, personal safety is guaranteed, and the working time is shortened.
Disclosure of Invention
In order to overcome the problems, the inventor of the invention carries out intensive research and designs a connecting pipe cold-fitting method, which is carried out by adopting a connecting pipe cold-fitting auxiliary device, wherein the auxiliary device is provided with a sleeve for containing a connecting pipe to be cold-fitted, is matched with an extension bar and a bottom plate, can smoothly take the connecting pipe to be cold-fitted out of a liquid nitrogen tank and is quickly assembled on a product to realize the cold-fitting of the connecting pipe.
The invention aims to provide a connecting pipe cold-charging method, which comprises the following steps:
and 4, after cooling, taking out the auxiliary device and carrying out cold loading.
In step 1, the auxiliary device comprises a sleeve for containing the adapter tube and an extension bar connected with the sleeve, wherein the extension bar and the sleeve are fixedly connected through a bottom plate, the top end of the sleeve is open, and the bottom end of the sleeve is preferably non-closed.
Wherein, one end of the extension bar is connected with the upper surface of the bottom plate, the axis of the extension bar is vertical to the upper surface of the bottom plate, preferably welded,
the sleeve is connected with the upper surface of the bottom plate, and the axis of the sleeve is vertical to the upper surface of the bottom plate.
The sleeve is hollow, the sleeve is connected with the upper surface of the bottom plate through the cushion block, one end of the cushion block is connected with the bottom of the side face of the sleeve, welding is preferred, and the other end of the cushion block is connected with the upper surface of the bottom plate, welding is preferred.
The bottom of the side surface of the sleeve is provided with one or more holes, and the center line of each hole is perpendicular to the axis of the sleeve.
The auxiliary device also comprises a lifting lug capable of hanging the auxiliary device, and the lifting lug is connected with the other end of the extension bar, preferably welded.
And 2, placing the connecting pipe into a sleeve of the auxiliary device in a vertical, inclined or transverse mode.
And 3, placing the auxiliary device provided with the connecting pipe into a coolant, so that the water line of the coolant is higher than that of the connecting pipe, the coolant is preferably liquid nitrogen, and the time for placing the auxiliary device into the coolant for cooling is preferably 10-180 min.
And 4, taking out the auxiliary device with the connecting pipe, taking out the connecting pipe, and carrying out cold loading on the connecting pipe.
In the step 4, the cold charging time is 1-4 s.
The invention has the following beneficial effects:
(1) the connecting pipe cold-charging method provided by the invention is carried out by adopting the connecting pipe cold-charging auxiliary device, the auxiliary device has the advantages of simple structure, simple material selection and manufacture, and simple and practical operation, and can be suitable for cold-charging processes of various connecting pipes through size fine adjustment;
(2) when the auxiliary device is adopted for cold loading of the connecting pipe, the connecting pipe to be cold loaded is placed into the device and is placed into liquid nitrogen, and the connecting pipe is taken out along with the device after cooling is finished, so that the installation is carried out quickly, the cold loading time can be shortened, the cold loading quality is ensured, and the production efficiency is improved;
(3) when the connecting pipe cold-charging method is adopted, after cooling is finished, the auxiliary device is taken out of the liquid nitrogen tank, the connecting pipe to be cold-charged is taken out smoothly, the auxiliary device can bear the weight of the connecting pipe, the danger that the connecting pipe falls off is avoided, the problems that the steel wire is fragile and broken during traditional cold charging, the connecting pipe falls into liquid nitrogen and is difficult to take out and splashes out of the liquid nitrogen are avoided, the method is simple and convenient to operate, the personal safety can be guaranteed, and the safety is high;
(4) the cold-fitting method of the connecting pipe does not damage the inner wall and the outer wall of the connecting pipe during cold fitting, avoids the problem that the inner wall of the connecting pipe is scratched by the traditional steel wire, and ensures the quality of the connecting pipe.
Drawings
FIG. 1 is a schematic view of a preferred embodiment of a nozzle cold pack assist apparatus;
FIG. 2 is a side view and a partial enlarged view of a preferred embodiment of a nozzle cold-fitting assist device.
The reference numbers illustrate:
1-lifting lugs;
2-lengthening the rod;
3-a bottom plate;
4-cushion block;
5-sleeve pipe.
Detailed Description
The invention is explained in more detail below with reference to the drawings and preferred embodiments. The features and advantages of the present invention will become more apparent from the description.
According to the invention, a method for cold-fitting a connecting pipe is provided, and is preferably carried out by adopting a connecting pipe cold-fitting auxiliary device.
In the invention, when the connecting pipe is subjected to cold loading, the connecting pipe to be subjected to cold loading is required to be placed in liquid nitrogen for cooling, the connecting pipe is taken out of the liquid nitrogen after being cooled for a certain time, the connecting pipe to be subjected to cold loading is subjected to cold shrinkage in the liquid nitrogen, the connecting pipe after cold shrinkage meets the requirement of the assembly size, and then the connecting pipe to be subjected to cold loading is assembled on a product, so that the assembling of the connecting pipe is completed. In order to take out the connecting pipe to be cold-packed from the liquid nitrogen conveniently and assemble the low-temperature connecting pipe on a product quickly, an auxiliary connecting pipe cold-packing device is needed.
The cold-mounting method of the connecting pipe provided by the invention is carried out by adopting an auxiliary device for cold-mounting the connecting pipe, and comprises the following steps:
In the invention, in the step 1, the auxiliary device is a connecting pipe cold-charging auxiliary device, the connecting pipe to be cold-charged can be cooled and rapidly assembled on a product by adopting the auxiliary device, the auxiliary device is taken out smoothly, the cold-charging time can be shortened, the working efficiency is improved, and the personal safety and the cold-charging quality are ensured.
According to the invention, in the step 1, the auxiliary device comprises a sleeve 5 for containing the connecting pipe, the connecting pipe to be cold-packed is placed into the sleeve 5 and then placed into a liquid nitrogen tank for cooling, after the connecting pipe is cooled for a certain time, the clamping device is taken out and taken out together with the connecting pipe to be cold-packed, the taking-out mode is convenient and rapid, the risk that the connecting pipe falls into the liquid nitrogen tank due to the fact that the steel wire is broken when the steel wire is connected with the connecting pipe and taken out in the prior art is avoided, the influence on personal safety due to liquid nitrogen splashing is prevented, safety accidents are avoided, the problem that the steel wire is scratched on the connecting pipe is avoided, the process of twisting and breaking the steel wire is also omitted, the connecting pipe to be cold-packed taken out from the liquid nitrogen can be rapidly assembled on a product in a short time, the working time is shortened.
According to the present invention, as shown in fig. 1, the top end of the sleeve 5 is open, and the adapter to be cold-packed can be put into the sleeve 5 from the top end opening of the sleeve 5, and after cooling is finished, the adapter can be easily taken out from the top end open end of the sleeve 5.
According to the invention, the bottom end of the sleeve 5 is closed or non-closed, preferably the bottom end of the sleeve 5 is non-closed.
The inventor finds that treating cold charge takeover and cooling completely, treat that cold charge takeover need immerse completely in the liquid nitrogen, if sleeve 5's bottom is confined, will treat cold charge takeover and put into sleeve 5, when sleeve 5 immerses completely in the liquid nitrogen, the resistance of sleeve 5 bottom can receive the liquid nitrogen, the liquid nitrogen enters into sleeve 5 through sleeve 5's upper shed, after the cooling, the liquid nitrogen in sleeve 5 is difficult to flow out or pour out, cause the liquid nitrogen of loss and take over easily to the liquid nitrogen and can cause the injury to the human body, thereby the degree of difficulty of cold charge has been increased.
According to the invention, the bottom end of the sleeve 5 is non-closed, preferably the bottom end of the sleeve 5 is provided with one or more holes. The shape and size of the hole are not particularly limited, and the size of the hole ensures that the adapter tube does not fall off and that the liquid nitrogen immersed in the sleeve 5 can smoothly flow out.
According to the invention, in step 1, the auxiliary device further comprises an extension bar 2 connected to the sleeve 5.
In the present invention, the extension bar 2 is coupled to the sleeve 5 so that the sleeve 5 can be put into the liquid nitrogen tank through the extension bar 2, and preferably, the extension bar 2 has a length adjustable, for example, the extension bar 2 has a telescopic structure. The length of the extension bar 2 is determined according to the height of the liquid nitrogen water line and the length of the connecting pipe so as to ensure that the liquid nitrogen water line is higher than the connecting pipe, thereby ensuring that the connecting pipe to be cold-packed in the sleeve 5 is cooled and shrunk.
According to the invention, the sleeve 5 is placed into the liquid nitrogen tank through the extension bar 2, so that the dangerous safety problem caused by directly placing the sleeve 5 into the liquid nitrogen tank by hands can be avoided, and the sleeve 5 is conveniently placed and taken out through the extension bar 2 and is smoothly taken out.
According to a preferred embodiment of the present invention, extension bar 2 is in direct contact with sleeve 5, and preferably the side of sleeve 5 is fixedly attached, preferably welded, to the side of extension bar 2, thereby ensuring that there is no relative movement between extension bar 2 and sleeve 5, and direct control of sleeve 5 into and out of liquid nitrogen is provided by extension bar 2.
According to another preferred embodiment of the invention, the sleeve 5 is fixedly connected to the extension bar 2 by means of the base plate 3.
According to the invention, the bottom plate 3 is rectangular plate-shaped, the extension bar 2 is cylindrical, the sleeve 5 is circular tube-shaped, one end of the extension bar 2 is connected with the upper surface of the bottom plate 3, the axis of the extension bar 2 is perpendicular to the upper surface of the bottom plate 3, preferably welded, the sleeve 5 is connected with the upper surface of the bottom plate 3, and the axis of the sleeve 5 is perpendicular to the upper surface of the bottom plate 3.
The inventor finds that when the side of the sleeve 5 is not porous, the bottom end of the sleeve 5 is in direct contact with the upper surface of the bottom plate 3, the bottom end of the sleeve 5 is closed, when the clamping device is placed in a liquid nitrogen tank, liquid nitrogen enters the sleeve 5 from an opening at the upper end of the sleeve 5, so that a to-be-cooled connecting pipe is cooled, the liquid nitrogen in the sleeve 5 is difficult to flow out after the cooling is finished, when the auxiliary device is taken out, the taken liquid nitrogen is difficult to take out and recycle, the cold charging time can be prolonged, the cold charging quality is affected, and the taken liquid nitrogen can cause injury to a human body.
Therefore, the connecting pipe to be cooled is directly contacted with the liquid nitrogen and is separated from the liquid nitrogen when the connecting pipe to be cooled is taken out, so that the cooling shrinkage of the connecting pipe can be quickly realized, the size requirement of assembly is met, the quick assembly is realized, and the production efficiency is improved.
According to the present invention, the sleeve 5 is hollow, the bottom end of the sleeve 5 is in non-contact connection with the upper surface of the bottom plate 3, and preferably, the bottom end of the sleeve 5 is parallel to and spaced from the upper surface of the bottom plate 3.
In the invention, the distance between the bottom surface of the sleeve 5 and the upper surface of the bottom plate 3 is selected according to the size of the connecting pipe, and the distance between the sleeve 5 and the bottom plate 3 is preferably smaller than the diameter of the connecting pipe, so that the connecting pipe cannot fall from a gap between the sleeve 5 and the bottom plate, and the liquid nitrogen can be ensured to smoothly and completely flow out from the gap.
According to the invention, when the clamping device is placed in liquid nitrogen, the liquid nitrogen enters the sleeve 5 from the gap and contacts with the connecting pipe to be cooled, preferably, the liquid nitrogen water level line is not lower than the top height of the connecting pipe to be cooled, so that the connecting pipe to be cooled is completely immersed in the liquid nitrogen, the connecting pipe to be cooled is fully and uniformly cooled, the cooling time is set, the connecting pipe to be cooled is contracted, the clamping device and the connecting pipe to be cooled are integrally taken out from the liquid nitrogen tank after the cooling is finished, the liquid nitrogen can completely flow out from the gap, the clamping device cannot bring the liquid nitrogen out, the personal safety is not affected, and the liquid nitrogen flows out from the gap, so that the resistance of the liquid nitrogen when the clamping device is taken out is reduced, the time for taking the connecting pipe to be cooled out from the liquid nitrogen is saved, the cooling time is shortened, and the cooling quality is ensured.
According to a preferred embodiment of the present invention, the sleeve 5 is hollow, the sleeve 5 is connected with the upper surface of the bottom plate 3 through a spacer 4, one end of the spacer 4 is connected with the bottom of the side surface of the sleeve 5, preferably welded, and the other end of the spacer 4 is connected with the upper surface of the bottom plate 3, preferably welded.
According to the invention, the cushion block 4 is arranged between the bottom surface of the sleeve 5 and the upper surface of the bottom surface, and the sleeve 5 is lifted by the cushion block 4, so that a gap is ensured to be generated between the sleeve 5 and the bottom plate 3.
The inventor finds that too many cushion blocks 4 can obstruct the outflow of liquid nitrogen, so that the liquid nitrogen cannot completely and quickly flow out of the sleeve 5, and the liquid nitrogen is easy to flow out to affect the personal safety; too few spacers 4 do not guarantee a stable connection of the sleeve 5 to the base plate 3 and may cause the nozzle to fall out of the sleeve 5.
According to the invention, the number of spacers 4 is three to several, preferably three to five, more preferably three.
According to the invention, the spacer 4 has a rectangular parallelepiped shape or a cylindrical shape, preferably a cylindrical shape, as shown in fig. 1.
According to the invention, the cushion blocks 4 are uniformly welded on the side surface of the bottom of the sleeve 5 and are welded with the upper surface of the bottom plate 3, so that the sleeve 5 is fixedly connected with the bottom plate 3.
In the invention, the sleeve 5 and the bottom plate 3 are connected through the cushion block 4, so that the connecting pipe to be cold-assembled can be contained, and the liquid nitrogen can be ensured to completely flow out after cooling is finished, and the welding (or assembling and welding) connecting mode and materials can bear the weight of the connecting pipe (such as 1.7kg of the weight of a single connecting pipe), so that the connecting pipe cannot be brittle fracture or fracture at low temperature, and the cold-assembling process can be ensured to be smoothly carried out.
According to another preferred embodiment of the invention, the sleeve 5 is hollow, the side of the bottom end of the sleeve 5 is provided with grooves, preferably with more than three grooves, the grooves are evenly distributed on the circumference of the side, and the end of the sleeve 5 provided with grooves is connected, preferably welded, to the upper surface of the bottom plate 3.
According to the invention, the side surface of the bottom end of the sleeve 5 is provided with the groove, and one end provided with the groove is connected with the upper surface of the bottom plate 3, so that when the clamping device is taken out of liquid nitrogen, the liquid nitrogen can completely flow out of the device through the groove without residue, no harm is caused to human bodies when the clamping device is taken out, and the loss of the liquid nitrogen can be avoided.
According to the invention, the bottom of the side of the casing 5 is provided with one or more holes, preferably with their centre lines perpendicular to the axis of the casing 5.
In the invention, in order to ensure that the liquid nitrogen can rapidly flow out of the clamping device when the clamping device is taken out of the liquid nitrogen, one or more holes, preferably more than three holes, are arranged at the bottom of the side surface of the sleeve 5, and the size of the holes is used for ensuring that the connecting pipe does not fall off and facilitating the liquid nitrogen to flow out.
According to the invention, the central line of the hole at the bottom of the side surface of the sleeve 5 is vertical to the axis of the sleeve 5, the hole is preferably a round hole, the hole diameter is equal, the hole diameter is preferably smaller than the diameter of the connecting pipe, and the circle center is on the same circumferential surface of the sleeve 5.
According to the invention, one or more holes are arranged in the projection area of the sleeve 5 on the bottom plate 3, the size of the hole is adjusted according to the size of the connecting pipe, and the hole can be a round hole, a square hole, a triangular hole or a hole with other shapes, so that the connecting pipe is ensured not to fall from the hole, preferably the round hole, and the diameter of the round hole is smaller than the outer diameter of the connecting pipe, thereby ensuring that liquid nitrogen can rapidly flow out, reducing the resistance of the liquid nitrogen to the bottom plate, and further shortening the cold charging time.
According to the invention, one or more holes are formed in other areas on the bottom plate 3, namely the projection of the non-sleeve 5 on the bottom plate 3 and the areas which are not connected, so that the auxiliary device can be quickly taken out of liquid nitrogen after cooling, and the resistance of the liquid nitrogen to the bottom plate is reduced due to the holes, thereby shortening the cold charging time.
According to the invention, the device also comprises a lifting lug 1 capable of suspending the auxiliary device, preferably the lifting lug 1 is connected, preferably welded, to the other end of the extension bar 2.
In the invention, the other end of the extension bar 2 is provided with the lifting lug 1, the connecting pipe cold-assembly clamping device can be hung and fixed on the wall of the liquid nitrogen tank through the lifting lug 1, the clamping device and the connecting pipe to be cooled can be prevented from falling into the liquid nitrogen tank, and the clamping device can be conveniently extracted after cooling is finished, so that the connecting pipe can be easily taken out.
According to the invention, the sleeve 5, the bottom plate 3, the extension bar 2, the cushion block 4 and the lifting lug 1 are made of low-temperature-resistant stainless steel materials, so that the obvious property change can not occur in liquid nitrogen cooling, and the sleeve, the bottom plate, the extension bar 2, the cushion block 4 and the lifting lug 1 can not be broken or fractured.
The cold-fitting clamping device for the connecting pipe, provided by the invention, comprehensively considers the aspects of material selection, structural design, product clamping, production safety and the like, the material selection for preparing the clamping device is convenient, the operation is convenient, and the cold-fitting clamping device can be used for clamping (or assisting) various cold-fittings of the connecting pipe.
According to the invention, the cold-fitting method of the connecting pipe is preferably carried out by adopting the auxiliary device for cold-fitting the connecting pipe.
According to the invention, in the step 1, the sleeve 5 and the bottom plate 3 are fixedly connected through the cushion block 4, one end of the cushion block 4 is welded on the side surface of the bottom of the sleeve 5, preferably, the number of the cushion blocks 4 is 3, the other end of the cushion block 4 is welded with the upper surface of the bottom plate 3, so that the sleeve 5 is fixedly connected with the bottom plate 3, the bottom surface of the sleeve 5 is parallel to the upper surface of the bottom plate 3, the distance between the bottom surface of the sleeve 5 and the upper surface of the bottom plate 3 is determined according to the size of a connecting pipe to be cold-assembled, and if the connecting pipe to be cold-assembled is smaller in size, the distance between the bottom surface of the sleeve 5 and the upper surface of the bottom;
then, the extension bar 2 is fixedly connected to the base plate 3, and preferably, one end of the extension bar 2 is welded to the upper surface of the base plate 3. The length of the extension bar 2 can be selected according to the height of the water level line of the liquid nitrogen, so that the connecting pipe to be cold-assembled in the sleeve 5 can be completely immersed into the liquid nitrogen, the water level line of the liquid nitrogen can be enabled to be higher than the connecting pipe, and cooling is realized. And finally, fixedly connecting the lifting lug 1 with the other end of the extension bar 2, preferably welding, and preparing or installing the connecting pipe cold-mounting clamping device.
And 2, placing the adapter tube to be cooled into an auxiliary device.
According to the invention, in the step 2, the adapter tube to be cold-assembled is placed into the sleeve 5 from the opening at the top end of the sleeve 5, the placing mode of the adapter tube to be cold-assembled in the sleeve 5 is not particularly limited, and the adapter tube can be placed horizontally, vertically or obliquely, so that the adapter tube is ensured not to fall down when being placed into the sleeve 5.
And 3, putting the auxiliary device into the coolant.
According to the invention, in step 3, in order to achieve the required size when the connecting pipe is subjected to cold loading, the connecting pipe is placed in a coolant for cooling shrinkage, the coolant is preferably liquid nitrogen, wherein the liquid nitrogen is contained in a liquid nitrogen tank, and when the connecting pipe is cooled, an auxiliary device provided with the connecting pipe to be subjected to cold loading is placed in the coolant.
According to the invention, in step 3, the connecting pipe cold-fitting clamping device provided with the connecting pipe to be cold-fitted is placed into the liquid nitrogen tank, the cover of the liquid nitrogen tank is covered, and the connecting pipe to be cold-fitted is cooled.
According to the invention, in step 3, when the auxiliary device provided with the connecting pipe to be cooled is placed into the coolant, in order to ensure that the connecting pipe to be cooled is sufficiently cooled and all parts are uniformly cooled, the water level line of the coolant is required to be higher than that of the connecting pipe, namely, the connecting pipe is required to be completely immersed into the coolant to ensure complete cooling, then the auxiliary device is fixed on the wall of a container, such as the wall of a liquid nitrogen tank, through the lifting lugs 1, the coolant is in direct contact with the connecting pipe to be cooled for cooling, and the cooling time is determined according to actual requirements.
According to the invention, the cooling time is determined according to the requirement of the cold charging size, and is too short to meet the cold charging requirement, so that the cold charging effect is poor.
According to the invention, in step 3, the cooling time is 10-180 min, preferably 20-150 min, more preferably 30-120 min, such as 60 min.
And 4, after cooling, taking out the auxiliary device and carrying out cold loading.
According to the invention, in step 4, after cooling is finished, the auxiliary device with the pipe to be cold-assembled is taken out, when the auxiliary device is taken out, the coolant flows out from the gap between the bottom plate 3 and the sleeve 5 of the auxiliary device, and no coolant such as liquid nitrogen is left on the auxiliary device, so that the safety of taking out the auxiliary device is ensured. The adapter in the sleeve 5 is removed and fitted to the product quickly after the removal of the device. The step of twisting off the steel wire and then carrying out cold charging in the prior art is reduced, and the cold charging time is shortened.
According to the invention, in step 4, after cooling, the auxiliary device is taken out of the coolant by extracting the extension bar 2, the coolant completely flows out of the gap between the sleeve 5 and the bottom plate 3 and/or the hole arranged on the sleeve 5 without residue, and meanwhile, the connecting pipe to be cold-assembled is taken out of the sleeve 5 and is rapidly assembled on a product to complete cold assembly of the connecting pipe.
The cold-charging time is the time from taking the connecting pipe out of the liquid nitrogen to successfully assembling the connecting pipe on the product, the cold-charging time is short, the cold-charging effect is good, the product quality is high, the cold-charging time is long, the connecting pipe expands to the original size and is clamped into a hole by half, and the connecting pipe cannot be successfully assembled.
When the method is used for cold charging, the cold charging time is shortened, the quality is guaranteed, the personal safety is guaranteed, and the efficiency is improved. Compared with the prior steel wire, the process saves one step, namely taking out the connecting pipe and placing stably; the steel wire is cut off in two steps, and the cold charging time is 4 s. The device is directly taken out, the connecting pipe is taken out, and the cold charging time is 2 s. In comparison, the cold-charging time is shortened by 2 seconds. The cold-charging time is generally controlled within 6 seconds (if the cold-charging process is disconnected or stopped, the connecting pipe expands to the original size, is extremely easy to clamp into a half of the hole and cannot be taken out), and the device directly saves one third of the time. In contrast, 2 seconds are added for cold charging, and the quality of the product is ensured. In the aspect of safety, the connecting pipe is directly taken out of the clamping device, the steel wire is prevented from being broken, the connecting pipe falls, liquid nitrogen splashes to hurt people, and safety is guaranteed. The connecting pipe can be conveniently and smoothly put into and taken out of the liquid nitrogen, personal safety is guaranteed, working time is shortened, and production efficiency is improved.
According to the invention, in step 4, the cold charging time is 1-4 s, preferably 1-2 s, for example 2 s.
The connecting pipe cold-packing method is simple and convenient to operate, high in safety and high in production efficiency, and in the traditional cold-packing process, the connecting pipe is bound by the steel wire or hooked, cooled in liquid nitrogen, taken out of the steel wire and the connecting pipe, twisted off, and assembled. In the traditional process, the steel wire is easy to break at low temperature, the connecting pipe is difficult to take out if falling into the coolant container, and the steel wire is bound with the connecting pipe and can scratch the inner wall or the outer wall of the connecting pipe to influence the quality of the connecting pipe.
The connecting pipe cold-fitting method directly takes out the connecting pipe cold-fitting device and simultaneously takes out the connecting pipe to be cooled for assembly, thereby shortening the cold-fitting time, improving the working efficiency, being convenient to operate and ensuring the personal safety and the quality of the connecting pipe.
Examples
As shown in fig. 1 and 2, wherein fig. 1 is a schematic view of a pipe connecting cold-fitting auxiliary device, and fig. 2 is a side view thereof, the pipe connecting auxiliary device comprises a sleeve 5, a bottom plate 3, a cushion block 4, an extension bar 2 and a lifting lug 1. Wherein, sleeve pipe 5 is the pipe form, and sleeve pipe 5 is hollow, and sleeve pipe 5's internal diameter is 45mm, and the wall thickness is 3mm, highly is 120mm, and the material is 304 stainless steel, and bottom plate 3 is the rectangle platelike, and length is 120mm, and the width is 100mm, highly is 10mm, and the height of cushion 4 is 30mm, and 4 numbers of cushion are 3, and extension bar 2 is long tubulose, and the length of extension bar 2 is 600 mm.
Fig. 2 is a side view of the auxiliary device for cold fitting of the connecting pipe, wherein A is a partially enlarged schematic view with an enlarged scale of 1: 3. Weld the one end of three cushion 4 and the side of sleeve pipe 5 bottom, the other end of cushion 4 and the upper surface welding of bottom plate 3, realize sleeve pipe 5 and bottom plate 3's fixed connection, the distance between sleeve pipe 5 and the bottom plate 3 is 20mm, then weld the one end of extension bar 2 on the upper surface of bottom plate 3, realize the fixed connection of extension bar 2 and bottom plate 3, then weld lug 1 at the other end of extension bar 2, obtain taking over cold charge clamping device.
Vertically placing a pressurizer connecting pipe to be cold-assembled (the specification phi is 34mm, the length L is 315mm, and the weight is 1.7kg) into a sleeve 5 of the device;
placing the auxiliary device provided with the pressure stabilizer connecting pipe to be cold-packed into a liquid nitrogen tank provided with liquid nitrogen, enabling the water level line of the liquid nitrogen to be higher than that of the connecting pipe, hanging the liquid nitrogen tank on the wall of the liquid nitrogen tank by using a lifting lug 1, covering a cover of the liquid nitrogen tank, and cooling the pressure stabilizer connecting pipe to be cold-packed for 1 h;
after cooling, the cover of the liquid nitrogen tank is opened, the auxiliary device provided with the connecting pipe to be cold-packed is taken out of the liquid nitrogen tank, the connecting pipe to be cold-packed is taken out at the same time, and the connecting pipe to be cold-packed is assembled on a product, wherein the cold-packing time is 2 s.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on operational states of the present invention, and are only used for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention has been described in detail with reference to the preferred embodiments and illustrative examples. It should be noted, however, that these specific embodiments are only illustrative of the present invention and do not limit the scope of the present invention in any way. Various modifications, equivalent substitutions and alterations can be made to the technical content and embodiments of the present invention without departing from the spirit and scope of the present invention, and these are within the scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (4)
1. A cold-fitting method for connecting pipes is characterized by comprising the following steps:
step 1, installing or preparing an auxiliary device;
the auxiliary device comprises a sleeve (5) for containing the connecting pipe and an extension bar (2) connected with the sleeve (5), wherein the extension bar (2) is fixedly connected with the sleeve (5) through a bottom plate (3);
the top end of the sleeve (5) is open, and the bottom end of the sleeve (5) is not closed;
the sleeve (5) is hollow, the sleeve (5) is connected with the upper surface of the bottom plate (3) through a cushion block (4),
one end of the cushion block (4) is connected with the bottom of the side face of the sleeve (5), and the other end of the cushion block (4) is connected with the upper surface of the bottom plate (3);
one end of the cushion block (4) is welded with the bottom of the side surface of the sleeve (5), and the other end of the cushion block (4) is welded with the upper surface of the bottom plate (3);
a groove is arranged on the side surface of the bottom end of the sleeve (5);
the device also comprises a lifting lug (1) capable of hanging the auxiliary device, wherein the lifting lug (1) is connected with the other end of the extension bar (2);
one or more holes are formed in the bottom of the side face of the sleeve (5), and the center line of each hole is perpendicular to the axis of the sleeve (5);
step 2, placing the adapter tube to be cooled into an auxiliary device;
step 3, placing the auxiliary device into the coolant;
placing the auxiliary device with the connecting pipe into the coolant, so that the water level line of the coolant is higher than that of the connecting pipe;
the coolant is liquid nitrogen, and the liquid nitrogen is placed into the coolant for cooling for 10-180 min;
step 4, after cooling, taking out the auxiliary device, and carrying out cold loading;
and taking out the auxiliary device with the connecting pipe, taking out the connecting pipe, and carrying out cold filling on the connecting pipe, wherein the cold filling time is 1-4 s.
2. The method according to claim 1, wherein, in step 1,
one end of the extension bar (2) is connected with the upper surface of the bottom plate (3), the axis of the extension bar (2) is vertical to the upper surface of the bottom plate (3),
the sleeve (5) is connected with the upper surface of the bottom plate (3), and the axis of the sleeve (5) is vertical to the upper surface of the bottom plate (3).
3. A method according to claim 1, characterised in that the lifting lug (1) is welded to the other end of the extension bar (2).
4. Method according to claim 1, characterized in that in step 2, the pipe to be cold-filled is placed in the sleeve (5) of the auxiliary device in a vertical, diagonal or horizontal manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811641987.XA CN109732501B (en) | 2018-12-29 | 2018-12-29 | Cold-mounting method for connecting pipe |
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| CN201811641987.XA CN109732501B (en) | 2018-12-29 | 2018-12-29 | Cold-mounting method for connecting pipe |
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| CN109732501B true CN109732501B (en) | 2021-07-09 |
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