Threaded pipe production equipment

Abstract

The present invention relates to the technical field of metal tube processing, and specifically discloses a threaded tube production device, including a shell, a driver and a spinning ring, wherein the driver is fixedly connected to the shell, the driver is used to drive the spinning ring to rotate, a movable plug is slidably connected to the shell, a forming channel is opened on the movable plug, a movable stretching die is connected to the forming channel of the movable plug, and the movable stretching die is used to reduce the diameter of the tube before forming the internal thread; a closed cavity is provided between the movable plug and the shell, an air supply unit can be externally connected to the shell, and the air supply unit is connected to the closed cavity. This solution is used to solve the problem of difficulty in removing the tube with an inner core after the threaded tube is processed in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of metal pipe processing, in particular to threaded pipe production equipment. Background Art

[0002] Sometimes, internal threads need to be processed on some soft metal tubes, such as copper tubes and aluminum tubes, in order to enhance the heat dissipation or thermal conductivity of the metal tubes. The processed tubes with internal threads are called threaded tubes. Threaded tubes are generally formed by spinning. Spinning requires spinning rings and inner cores. The spinning rings are equipped with steel balls. When the spinning rings rotate, the steel balls both rotate and revolve. The inner cores are fixed with threaded core heads and floating core heads. When the spinning rings rotate, the inner cores rotate as a whole. During the spinning process, the inner cores are located inside the tubes, and the spinning rings wrap around the tubes. The outer wall of the tubes is squeezed by the steel balls on the spinning rings, and the metal on the tubes is rolled onto the tooth grooves of the threaded core heads. During the internal thread forming process, the tubes are pulled by traction equipment, so that the internal threads of the inner wall of the tubes are processed while the tubes are moving.

[0003] However, during the spinning process, since the tube is in a tensioned state during the entire processing process, when the tube is processed, a section of the tube with the inner core needs to be taken out to facilitate the removal of the inner core. However, since the tube is pressed between the inner core and the spinning ring during processing, the tube is subjected to the force of the spinning ring and the inner core, making it difficult to remove the tube with the inner core. Summary of the invention

[0004] The present invention aims to provide a threaded pipe production device to solve the problem in the prior art that it is difficult to take out the pipe with an inner core after the threaded pipe is processed.

[0005] In order to achieve the above object, the basic scheme of the present invention is as follows:

[0006] The threaded pipe production equipment includes a shell, a driver and a spinning ring. The driver is fixedly connected to the shell and is used to drive the spinning ring to rotate. A movable plug is slidably connected to the shell, and a forming channel is opened on the movable plug. A movable stretching die is connected to the forming channel of the movable plug, and the movable stretching die is used to reduce the diameter of the pipe before forming the internal thread. A closed cavity is provided between the movable plug and the shell, and an air supply unit can be externally connected to the shell, and the air supply unit is connected to the closed cavity.

[0007] Compared with the prior art, the following are the beneficial effects:

[0008] When this solution is adopted, when the tube is formed, the inner core is placed in the tube, the tube passes through the forming channel, and at the same time the tube passes through the movable drawing die and the spinning ring. The movable core head on the inner core corresponds to the position of the movable drawing die. During the spinning process, the inner core rotates, and the tube is reduced in diameter on the movable drawing die and the movable core head (the reduction in diameter means that the outer diameter of the tube becomes smaller). The reduced-diameter tube continues to move forward, and when it moves to between the spinning ring and the thread core head, the internal thread of the tube is formed. When the entire tube is internally threaded and a section of the tube with the inner core needs to be taken out, The tube is cut off at the rear end of the spinning ring (the rear end of the spinning ring is the end of the tube with the internal thread processed). After cutting, the remaining tube in the equipment is still pressed between the spinning ring and the inner core. At this time, in order to facilitate the rapid removal of the tube with the inner core, the air supply unit provides air pressure for the closed cavity to force the moving plug to move away from the spinning ring. During the process of moving the plug away, the part of the tube that has not been reduced in diameter presses against the movable stretching die, which is equivalent to the movable stretching die pulling the tube to be taken out and moving it away from the spinning ring, so that the tube with the inner core is taken out from the spinning ring.

[0009] This solution facilitates the removal of the pipe with an inner core by providing an air supply unit, a movable plug, and a movable stretching die, thereby solving the problem in the prior art that it is difficult to remove the pipe with an inner core after the threaded pipe is processed. In addition, the presence of the movable stretching die allows the pipe to be reduced in diameter before the internal thread is formed. During the diameter reduction process, the metal on the pipe moves. Compared with the situation where the pipe is directly internally threaded, this solution is conducive to reducing the difficulty of forming the internal thread on the pipe.

[0010] Furthermore, the movable plug is connected with an adjustment block, the adjustment block can move on the movable plug, and the adjustment block can abut against the shell.

[0011] Beneficial effect: When processing different types of pipes, the sizes of the inner cores used are different, and the distances between the movable core head and the threaded core head are also different. In order to make the equipment adaptable to the processing requirements of different threaded pipes, an adjustment block is provided to adjust the distance between the movable drawing die and the spinning ring.

[0012] Furthermore, an oil injection channel is provided on the movable plug, one end of the oil injection channel is externally connected to an oil supply unit, and the other end of the oil injection channel can spray oil onto the spinning ring.

[0013] Beneficial effects: During the spinning process, there will be friction between the inner core, the tube and the spinning ring, and a large amount of heat will be generated during the forming process. If it is not eliminated, on the one hand, it will greatly affect the quality of the spinning forming, and on the other hand, it will easily cause wear of the spinning ring and the inner core, reducing their service life. In this solution, a continuous supply of oil is provided to the oil injection channel through the oil supply unit, and the oil is sprayed into the spinning ring through the oil injection channel, which not only achieves cooling, but also lubricates the spinning ring.

[0014] Furthermore, an oil supply cavity is provided on the surface of the movable plug slidingly attached to the shell, the oil supply cavity is connected to the oil injection channel, an oil inlet hole connected to the oil supply cavity is provided on the shell, and the oil inlet hole is connected to the oil supply unit.

[0015] Beneficial effect: When this solution is adopted, the oil provided by the oil supply unit is not only used to cool and lubricate the spinning ring, but the oil is also in the oil supply chamber, and the oil supply chamber is located on the sliding surface of the movable plug and the shell. During the movement of the movable plug relative to the shell, the oil can be brought to other places of the sliding surface, thereby realizing lubrication on the moving path of the movable plug.

[0016] Furthermore, the oil supply cavity is annular.

[0017] Beneficial effect: The annular oil supply cavity enables the sliding surfaces of the movable plug and the housing to be lubricated both above and below, thus achieving comprehensive lubrication of the sliding path of the movable plug.

[0018] Furthermore, an oil injection ring is fixedly connected to the movable plug, and a plurality of oil injection holes are arranged on the oil injection ring. The oil injection holes face the steel balls on the spinning ring, and the oil injection holes are connected to the oil injection channel.

[0019] Beneficial effects: When adopting this scheme, through the setting of the oil spray ring, on the one hand, the path of the oil before spraying is lengthened, so that the oil can be closer to the spinning ring before spraying, which is beneficial to improve the accuracy of the oil spraying to the spinning ring; in addition, when processing the internal threads of pipes of different specifications, the position of the steel ball on the spinning ring is not exactly the same. At this time, the corresponding oil spray ring can be replaced so that the oil can still be sprayed onto the steel ball through the matching oil spray ring to achieve lubrication of the steel ball.

[0020] Furthermore, an oil drain hole is provided in the shell, a filter is provided on the oil drain hole, and the oil drain hole is connected to an oil drain pipe; this is conducive to filtering the used oil and facilitating the recovery of the filtered oil.

[0021] Furthermore, the movable plug is also connected to a movable die sleeve, which is fixedly connected to the movable stretching die, and the movable die sleeve is slidably connected to the shell, and the moving direction of the movable die sleeve is parallel to the moving direction of the movable plug.

[0022] Beneficial effect: The installation of the movable drawing die is facilitated by the setting of the movable die sleeve.

[0023] Furthermore, an elastic member is fixedly connected between the movable plug and the movable mold sleeve.

[0024] Beneficial effects: During the process of forming the internal thread of the pipe, the pipe is pulled by the traction equipment, and the pulling generates a rigid force on the pipe. The elastic part is arranged here so that the elastic part gives a buffer force to the pipe through the movable stretching die, thereby improving the stability of the pipe processing and being beneficial to improving the quality of the internal thread processing of the pipe; on the other hand, when the pipe with the inner core is taken out from the spinning ring, the elastic part can also give the movable stretching die a force away from the spinning ring, thereby facilitating the removal of the pipe with the inner core.

[0025] Furthermore, it also includes an external nozzle, which can spray oil on the pipe entering the movable stretching die. An end of the movable plug away from the spinning ring is provided with an oil return groove, and the oil return groove is located below the movable stretching die.

[0026] Beneficial effects: When the movable drawing die reduces the diameter of the pipe, friction occurs between the pipe, the movable drawing die and the movable core head. At this time, the pipe entering the movable drawing die can be sprayed with oil through an external nozzle, which not only cools the pipe, but also facilitates the lubrication of the contact surface between the movable drawing die and the pipe. The setting of the oil return groove allows the oil to stay in the oil return groove for a period of time, and the lubrication effect of the oil on the movable drawing die can be improved during the time the oil stays. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a front cross-sectional view of an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A-direction view;

[0029] Figure 3 for Figure 1 An enlarged schematic diagram of part B in FIG. DETAILED DESCRIPTION

[0030] The following is further described in detail through specific implementation methods:

[0031] The figure marks in the drawings of the specification include: housing 1, locking screw 11, retaining ring 12, oil return groove 13, oil inlet hole 14, oil drain hole 15, filter 16, tail cover 17, oil receiving channel 18, oil return channel 19, driver 2, spinning ring 3, steel ball 31, movable plug 4, forming channel 41, closed cavity 42, oil injection channel 43, oil supply chamber 44, adjustment block 45, floating die sleeve 5, step 51, floating stretching die 6, spring 7, oil injection ring 8, oil storage tank 81, oil injection hole 82, sizing die 9.

[0032] Example

[0033] The embodiment is basically as shown in the attached Figures 1 to 3 As shown:

[0034] The threaded pipe production equipment includes a shell 1, a driver 2 and a spinning ring 3. The driver 2 adopts an electric spindle, and the driver 2 is fixedly connected to the shell 1. The driver 2 is used to drive the spinning ring 3 to rotate. The spinning ring 3 is provided with a steel ball 31. A movable plug 4 is slidably connected to the shell 1 in a transverse direction (a locking screw 11 is installed on the shell 1 to fix the movable plug 4, and the locking screw 11 can be pressed against the movable plug 4). A forming channel 41 is opened on the movable plug 4. A movable die sleeve 5 is slidably connected in the forming channel 41 of the movable plug 4 in a transverse direction. A movable drawing die 6 is fixedly connected to the movable die sleeve 5. The movable drawing die 6 is used to reduce the diameter of the pipe before forming the internal thread.

[0035] The movable plug 4 is also fixedly connected to a retaining ring 12 by screws, and the retaining ring 12 is fixedly connected to an oil return groove 13 (the oil return groove 13 is located at the end of the movable plug 4 away from the spinning ring 3), and the oil return groove 13 is located below the movable stretching die 6. A step 51 is integrally formed on the movable die sleeve 5, and the step 51 of the movable die sleeve 5 can be abutted against the end of the oil return groove 13, and the oil return groove 13 realizes the limiting of the movable die sleeve 5; it also includes an external nozzle (not shown in the figure), which can spray oil on the pipe entering the movable stretching die 6, and the oil return groove 13 can receive part of the oil sprayed by the nozzle to improve the lubrication effect of the movable stretching die 6.

[0036] An elastic member is fixedly connected between the movable plug 4 and the movable mold sleeve 5. The elastic member includes a spring 7 and a spring 7 sleeve. There are two spring 7 sleeves, one spring 7 sleeve is fixedly connected to the movable mold sleeve 5, and the other spring 7 sleeve is fixedly connected to the movable plug 4. The spring 7 sleeve is between the two spring 7 sleeves.

[0037] A sealed cavity 42 is provided between the movable plug 4 and the shell 1 . An air supply unit can be externally connected to the shell 1 . The air supply unit can be an air pump. The air supply unit is in communication with the sealed cavity 42 .

[0038] An adjusting block 45 is connected to the movable plug 4. The adjusting block 45 can move on the movable plug 4 and can be abutted against the shell 1. In this embodiment, the adjusting block 45 adopts an adjusting nut. The adjusting nut is threadedly connected to the movable plug 4. A positioning pin is connected to the adjusting nut. The positioning pin is used to lock the position of the adjusting nut on the movable plug 4 after the position of the adjusting nut is adjusted. By setting the adjusting nut and the positioning pin, the distance between the movable stretching die 6 and the spinning ring 3 can be adjusted to meet the production requirements of different threaded pipes.

[0039] The movable plug 4 is provided with an oil injection channel 43, and a ring-shaped oil supply chamber 44 is provided on the surface of the movable plug 4 slidingly attached to the housing 1, the oil supply chamber 44 is connected with the oil injection channel 43, and the housing 1 is provided with an oil inlet hole 14 connected with the oil supply chamber 44, and the oil inlet hole 14 is externally connected with the oil supply unit;

[0040] An oil injection ring 8 is fixedly connected to the end surface of the movable plug 4 facing the spinning ring 3 by screws. The oil injection ring 8 is provided with an oil storage groove 81 and a plurality of oil injection holes 82. In this embodiment, the number of the oil injection holes 82 is 3. The 3 oil injection holes 82 are located above, on the left and on the right of the oil injection ring 8. The oil injection holes 82 are connected to the oil storage groove 81, and the oil storage groove 81 is connected to the oil injection channel 43. The oil injection holes 82 face the steel balls 31 on the spinning ring 3, and the oil injection holes 82 can spray oil onto the steel balls 31.

[0041] An oil drain hole 15 is provided in the housing 1 and is located directly below the spinning ring 3 to facilitate timely discharge of oil. A filter screen 16 is fixedly mounted on the oil drain hole 15 and an oil drain pipe is connected below the oil drain hole 15 .

[0042] The right end of the shell 1 away from the spinning ring 3 and the movable plug 4 is fixedly connected with a tail cover 17, and a sizing die 9 is fixedly connected to the tail cover 17. After the pipe is reduced in diameter by the movable stretching die 6, it enters between the spinning ring 3 and the threaded core head of the inner rod to realize internal thread forming. Finally, the pipe passes through the sizing die 9 to fix the outer diameter of the pipe. An oil receiving channel 18 and an oil return channel 19 are opened on the tail cover 17. The oil receiving channel 18 is externally connected to an oil pump, and the oil outlet pipe of the oil pump is connected to the oil receiving channel 18, and the oil return pipe of the oil pump is connected to the oil return channel 19. The sizing die 9 and the pipe are lubricated and cooled by the oil pumped out by the oil pump.

[0043] The specific implementation process is as follows:

[0044] The production steps of the threaded pipe produced by this embodiment are as follows. The inner core and the pulling device need to be used in the production process. The pulling device is used to pull the pipe forward. The inner core includes a core rod, a threaded core head and a movable core head. The threaded core head and the movable core head are fixedly connected to the core rod. The specific production steps are as follows:

[0045] Step 1: reducing the diameter of the tube; during the forming process, step 1 and step 2 need to share the inner core, so step 1 and step 2 are processed simultaneously at different positions of the tube.

[0046] When the pipe passes between the movable stretching die 6 and the movable core head, the movable core head rotates continuously, and the pipe is reduced in diameter under the rotation of the movable core head and the traction of the traction equipment; while the pipe is reduced in diameter, the oil sprayed from the nozzle cools the pipe and lubricates the movable stretching die 6.

[0047] Step 2: thread forming; the reduced diameter pipe moves forward to between the spinning ring 3 and the thread core head of the inner core, the spinning ring 3 rotates and drives the steel ball 31 to rotate and revolve, the movement of the steel ball 31 drives the thread core head of the inner core to rotate, under the action of the traction equipment, the spinning ring 3 and the inner core, the inner thread of the inner wall of the pipe is formed, and the pipe continues to move forward.

[0048] During the process of pipe thread forming, the oil supply unit continuously supplies oil into the oil supply chamber 44. Under the action of oil pressure, the oil passes through the oil injection channel 43 and the oil storage tank 81, and then is sprayed from the oil injection hole 82 onto the pipe and the steel ball 31 of the spinning ring 3, and finally falls to the oil discharge hole 15, and then is discharged to the outside of the shell 1 through the oil drain pipe. During the whole process, the oil is used to cool the pipe, the spinning ring 3 and the inner core, and at the same time, the spinning ring 3 is lubricated.

[0049] Step three, threaded pipe sizing: the threaded pipe is pulled onto the sizing die 9 by a pulling device, and the pipe is pulled by the pulling device to achieve the sizing of the pipe.

[0050] During the sizing process, the oil pump continuously pumps oil to the sizing die 9 and the pipe to achieve lubrication and cooling of the pipe and the sizing die 9.

[0051] Step 4: Roll up the sizing threaded pipe for easy storage.

[0052] When the present embodiment is adopted, after the entire tube is formed, when a section of the tube with an inner core needs to be taken out, first, the tube is cut off at the rear end of the sizing die 9, and the remaining tube in the device after cutting is still pressed between the spinning ring 3 and the inner core; second, in order to facilitate the rapid removal of the tube with an inner core, the locking screw 11 is first loosened so that the movable plug 4 can move on the shell 1; third, the air supply unit is then used to provide air pressure to the closed cavity 42, forcing the movable plug 4 to move to the left. During the process of moving the movable plug 4 away, the part of the tube that has not been reduced in diameter is pressed against the movable stretching die 6, which is equivalent to the movable stretching die 6 pulling the tube to be taken out to move to the left, so that the tube with an inner core is taken out from the spinning ring 3; in this process, because the tube loses the traction of the traction device, the elastic force of the spring 7 on the elastic member is released, thereby promoting the movable die sleeve 5 to move to the left, and the movable stretching die 6 and the tube also move to the left, so that the tube with an inner core can be easily removed from the spinning ring 3.

[0053] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A threaded pipe production device, comprising a housing, a driver and a spinning ring, wherein the driver is fixedly connected to the housing and is used to drive the spinning ring to rotate, and is characterized in that: A movable plug is slidably connected to the shell, a forming channel is opened on the movable plug, a movable stretching die is connected to the forming channel of the movable plug, and the movable stretching die is used to reduce the diameter of the pipe before forming the internal thread; a closed cavity is provided between the movable plug and the shell, and an air supply unit can be externally connected to the shell, and the air supply unit is connected to the closed cavity; The movable plug is also connected with a movable die sleeve, which is fixedly connected with the movable stretching die, and the movable die sleeve is slidably connected with the shell, and the moving direction of the movable die sleeve is parallel to the moving direction of the movable plug, and an elastic member is fixedly connected between the movable plug and the movable die sleeve; The movable plug is connected with an adjusting block, the adjusting block can move on the movable plug, and the adjusting block can abut against the shell.

2. The threaded pipe production equipment according to claim 1, characterized in that: The movable plug is provided with an oil injection channel, one end of the oil injection channel is externally connected to an oil supply unit, and the other end of the oil injection channel can spray oil onto the spinning ring.

3. The threaded pipe production equipment according to claim 2, characterized in that: An oil supply cavity is arranged on the surface of the movable plug slidingly attached to the shell, and the oil supply cavity is communicated with the oil injection channel. An oil inlet hole communicated with the oil supply cavity is arranged on the shell, and the oil inlet hole is communicated with the oil supply unit.

4. The threaded pipe production equipment according to claim 3, characterized in that: The oil supply cavity is annular.

5. The threaded pipe production equipment according to claim 3, characterized in that: The movable plug is fixedly connected with an oil injection ring, on which a plurality of oil injection holes are arranged, the oil injection holes face the steel balls on the spinning ring, and the oil injection holes are communicated with the oil injection channel.

6. The threaded pipe production equipment according to claim 2, characterized in that: An oil drain hole is arranged in the shell, a filter screen is arranged on the oil drain hole, and the oil drain hole is connected with an oil drain pipe.

7. The threaded pipe production equipment according to claim 1, characterized in that: It also includes an external nozzle, which can spray oil on the pipe entering the movable stretching die. An oil return groove is arranged at one end of the movable plug away from the spinning ring, and the oil return groove is located below the movable stretching die.

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