Online degreasing device and method for titanium alloy seamless tube

Abstract

The invention relates to a titanium alloy seamless tube online degreasing device and method.The device comprises a pre-oil-scraping device (42), an outer wall degreasing device (43) and an inner wall degreasing device (44), the pre-oil-scraping device (42) comprises an outer wall oil wiper (4) and an inner wall oil wiper (5), and pre-degreasing is achieved; the outer wall is degreased through a hot water spraying device (15), a degreasing fluid spraying device (16), a brush cleaning device (17), a magnetic polishing degreasing device (18), an annular water jet cutter (19) and an annular air knife (20) of the outer wall degreasing device (43); and the inner wall degreasing device (44) is used for degreasing the inner walls of the two ends of the titanium tube (2) clamped by the quick-plug connectors (36). The method comprises the following steps: S1, physical pre-scraping; s2, online outer wall degreasing; and S3, online inner wall degreasing. And directly connecting with a rolling mill to realize continuous degreasing. The problems that in the prior art, manual participation is large, production continuity is weak, the degreasing effect is poor, and rolling oil pollutes the production environment due to off-line degreasing are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of titanium alloy seamless pipe online degreasing device and method, belong to cleaning technical field. BACKGROUND

[0002] Small-bore titanium alloy seamless pipe has a wide range of applications in the field of aviation and nuclear power, and the special application field has very high requirements for the surface quality of titanium alloy seamless pipe, and the pipe degreasing process will directly affect the surface quality of pipe. The traditional chemical soaking or high-pressure spraying is an offline degreasing method, which needs to be degreased after rolling a certain batch of pipe. During the waiting process of pipe after rolling, the oil solidifies or viscosity increases due to the change of ambient temperature, and the traditional degreasing method is difficult to completely remove the oil on the surface of the pipe, especially the inner wall of the pipe.

[0003] In view of the problem of poor effect of traditional offline degreasing method, a variety of online degreasing methods have been reported. Some improve ultrasonic cleaning technology, and realize online ultrasonic degreasing of super-long pipe by using telescopic pipe. Some methods combine pre-scrapers and flow degreasing, which are also applied to the degreasing of small-diameter nuclear pipes. For example, the domestic patent CN103203377A discloses a post-rolling degreasing method for super-long thin-walled alloy pipe for nuclear power steam generator, which proposes an online degreasing method. The outer surface is degreased by online rolling brush, the inner surface is pre-scraped by nylon oil scraper, and the high-pressure degreasing liquid is degreased by ultrasonic intensification. Finally, acetone is used to wipe the pipe to achieve clean surface. This patent is also an online degreasing method, but it needs too many personnel to participate, and the degreasing effect of online rolling brush and ultrasonic intensification is still not completely clean. Acetone wiping can further improve the cleanliness of the pipe surface, but the volatilization and toxicity of acetone are not conducive to industrial production.

[0004] However, these methods have certain shortcomings in degreasing effect and online automation, and need too many personnel to participate. The degreasing effect of online rolling brush and ultrasonic intensification is still not completely clean. Manual participation is required, and some use acid pickling degreasing agent or organic solvent, although the degreasing effect is good, but the environmental protection is not enough. SUMMARY

[0005] The technical problem to be solved by the present application is that manual participation in the prior art cannot realize continuous production, and the actual degreasing effect is poor.

[0006] The technical solution adopted by the present application to solve the technical problem is: a titanium alloy seamless pipe online degreasing device, comprising: A pre-scraping device includes an outer wall scraper and an inner wall scraper. The outer wall scraper is annular and passes through the mandrel of the rolling mill. The inner wall of the outer wall scraper is spaced apart from the mandrel, and a nylon scraper is provided on the inner wall. The inner wall scraper is rod-shaped, and its end can be detachably connected to the end of the mandrel away from the rolling mill. A rubber ring is provided on the outer wall of the inner wall scraper near the end of the mandrel. An external wall degreasing device includes a hot water spray device, a degreasing liquid spray device, a brush cleaning device, a magnetic polishing degreasing device, an annular water jet, an annular air knife, and guide wheels; the hot water spray device, the degreasing liquid spray device, the brush cleaning device, the magnetic polishing degreasing device, the annular water jet, and the annular air knife are arranged in sequence at intervals, and the guide wheels are arranged at intervals between the hot water spray device and the annular air knife; The inner wall degreasing device includes an automatic connector, a recovery box, and a high-pressure bubble degreasing system. The output end of the high-pressure bubble degreasing system and the feed end of the recovery box are both equipped with quick-connect connectors. The automatic connector includes two pneumatic claws spaced apart. The inner side of the pneumatic claws is inlaid with silicone pads, and the pneumatic claws can lock the quick-connect connector into the openings at both ends of the titanium tube.

[0007] The outer wall scraper in the above-mentioned device includes a clamping component, which is an annular structure with one side open and the open end bent outward. A locking screw is inserted through the bent end. A groove is provided on the inner wall of the outer wall scraper, and a nylon scraper is disposed in the groove.

[0008] Furthermore, the nylon scraper in the above-mentioned device has a serrated structure on the outer wall near the center of the scraper, and the end face is provided with felt.

[0009] In the aforementioned device, the inner wall scraper is a frustum-shaped conical rod, with the small end of the conical rod connected to the mandrel rod, and a rubber ring passing through the outer wall of the conical rod.

[0010] Furthermore, the small end of the inner wall scraper in the above-mentioned device is provided with a connecting thread, and the end of the mandrel is provided with a matching threaded hole, and the inner wall scraper is threadedly connected to the mandrel.

[0011] The magnetic polishing degreasing device mentioned above includes a degreasing liquid storage tank, a magnetic polishing liquid recovery pipeline, and a magnetic polishing tank. The magnetic polishing tank is set inside the degreasing liquid storage tank, and rubber guide holes are provided on both ends of the side walls. One end of the magnetic polishing liquid recovery pipeline is connected to the upper side wall of the magnetic polishing tank, and the other end is close to the bottom surface of the degreasing liquid storage tank. An electric diaphragm pump is installed on the pipeline. Nylon guide holes are provided on both ends of the degreasing liquid storage tank and are coaxially arranged with the rubber guide holes.

[0012] The high-pressure bubble degreasing system in the above-mentioned device includes a water tank, a degreasing liquid tank, a gas-liquid mixing pump and an air compressor. The inlet end of the gas-liquid mixing pump is connected to the water tank, the degreasing liquid tank and the outlet end of the air compressor respectively. The opening and closing of the inlet of the gas-liquid mixing pump is controlled by a valve, and a quick-connect fitting is set at the outlet end of the gas-liquid mixing pump.

[0013] A method for online degreasing of seamless titanium alloy tubes, comprising any of the above-mentioned online degreasing devices for seamless titanium alloy tubes, comprising the following steps: S1. Physical pre-scraping: An outer wall pre-scraping device and an inner wall pre-scraping device are arranged along the mill exit line. During the titanium tube rolling process, the rolled titanium tube is pushed through the outer wall pre-scraping device when it is fed into the rolling mill. S2. Online external wall degreasing: The pre-scraped titanium tube enters the online external wall degreasing unit through a conveying mechanism for external wall degreasing. S3. Online inner wall degreasing: After the outer wall degreasing, the titanium tube is moved to the online inner wall degreasing mechanism for inner wall degreasing.

[0014] In step S2 of the above method, the hot water sprayer preheats the outer wall of the titanium tube by spraying in hot water at 60-70℃. After the titanium tube passes through the hot water spraying device, a commercial neutral degreasing liquid at 60-70℃ is sprayed in by the degreasing liquid spraying device. The titanium tube, carrying the degreasing liquid, enters the rotating brush cleaning device. The high-speed rotating brush cleans the outer wall of the titanium tube. Then, it passes through the degreasing liquid spraying device and the brush cleaning device again for secondary cleaning. After the brush cleaning is completed, the titanium tube enters the magnetic polishing degreasing device. The magnetic polishing degreasing device uses a working frequency of 15-30Hz, a polishing rate of 10-30m / min, and a polishing time of 1-3min as process parameters to clean the surface of the titanium tube. After magnetic polishing, the titanium tube enters the annular water jet cleaning device, which is rinsed three times by high-pressure water at 0.6-1MPa. Finally, an annular air knife with compressed air at 0.4-0.6MPa removes residual water from the outer wall of the titanium tube.

[0015] In step S3 of the above method, the pipe inner wall degreasing system is started, and the flowing 60-70℃ neutral degreasing liquid enters the inner wall of the titanium pipe and continuously flushes for 5 minutes. After flushing, the gas-liquid mixing pump is started to provide high-pressure bubble neutral degreasing liquid and continuously flushes for 2-3 minutes. Then, the high-pressure water circuit is switched and continuously flushes for 1-2 minutes. Finally, the moisture in the pipe is removed by 0.4-0.6MPa compressed air.

[0016] The beneficial effects of this invention are: 1. Strong adaptability: The adjustable low-gap nylon sleeve on the outer wall and the fluororubber interference fit oil scraping device on the inner wall are specially designed for small diameter titanium tubes of Φ6mm-Φ25mm. It can remove the main rolling oil on the inner and outer walls of the tube during the rolling process, avoiding the problem of increased degreasing difficulty caused by the increase in the viscosity of the rolling oil with changes in ambient temperature. At the same time, the oil scraping device uses nylon and rubber components, which can effectively avoid surface scratches. The design structure solves the adaptation defects of traditional metal scrapers or rubber parts.

[0017] 2. High degreasing efficiency: Pre-scraping and rolling processes are carried out simultaneously, and online degreasing of the outer and inner walls can be completed within 15 minutes, which is similar to the rolling rhythm of pipes.

[0018] 3. Good environmental performance: Physical pre-scraping reduces the amount of chemical degreasing agent by more than 70%, and uses neutral degreasing agent (pH 7-8), which has no irritating odor. The online degreasing device is in a relatively closed environment, and pollutants can be collected and treated by adding exhaust gas and waste liquid pipelines. The online degreasing device also effectively avoids site pollution during the transfer of rolling oil with pipes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the cleaning process structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the pre-scraping oil device of the present invention.

[0021] Figure 3 This is a schematic diagram of the inner wall pre-degreasing device of the present invention.

[0022] Figure 4 This is a schematic diagram of the cross-sectional and sectional structure of the outer wall pre-degreasing device of the present invention.

[0023] Figure 5 This is a schematic diagram of the outer wall degreasing device of the present invention.

[0024] Figure 6 This is a schematic diagram of the magnetic degreasing device of the present invention.

[0025] Figure 7 This is a schematic diagram of the inner wall degreasing device of the present invention.

[0026] The markings in the diagram are as follows: 1 is a roller, 2 is a titanium tube, 3 is a mandrel, 4 is an outer wall scraper, 5 is an inner wall scraper, 6 is a tensioning rod, 7 is a connecting thread, 8 is a tapered rod, 9 is a rubber ring, 10 is an internally threaded rod, 11 is felt, 12 is a nylon scraper, 13 is a clamping component, 14 is a locking screw, 15 is a hot water spray device, 16 is a degreasing liquid spray device, 17 is a brush cleaning device, 18 is a magnetic degreasing device, 19 is a ring-shaped water jet, 20 is a ring-shaped air knife, 21 is a wastewater collection pipeline, 22 is a degreasing liquid recovery pipeline, and 23 is... Guide wheel, 24 is exhaust gas collection pipe, 25 is degreasing liquid storage tank, 26 is nylon guide hole, 27 is magnetic polishing liquid recovery pipe, 28 is magnetic polishing tank, 29 is rubber guide hole, 30 is water tank, 31 is degreasing liquid tank, 32 is valve, 33 is gas-liquid mixing pump, 34 is air compressor, 35 is pressure controller, 36 is quick connector, 37 is pneumatic chuck, 38 is guide roller, 39 is semi-finished pipe, 40 is recovery box, 41 is rolling mill, 42 is pre-oil scraping device, 43 is external wall degreasing device, 44 is internal wall degreasing device. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 7 As shown, the online degreasing device for seamless titanium alloy tubes of the present invention further includes: The pre-scraping device 42 includes an outer wall scraper 4 and an inner wall scraper 5. The outer wall scraper 4 is annular and passes through the mandrel 3 of the rolling mill 41. The inner wall of the outer wall scraper 4 is spaced apart from the mandrel 3, and a nylon scraper 12 is provided on the inner wall. The inner wall scraper 5 is rod-shaped, and its end can be detachably connected to the end of the mandrel 3 away from the rolling mill 41. A rubber ring 9 is provided on the outer wall of the inner wall scraper 5 near the end of the mandrel 3. The outer wall degreasing device 43 includes a hot water spray device 15, a degreasing liquid spray device 16, a brush cleaning device 17, a magnetic polishing degreasing device 18, an annular water jet 19, an annular air knife 20, and a guide wheel 23. The hot water spray device 15, the degreasing liquid spray device 16, the brush cleaning device 17, the magnetic polishing degreasing device 18, the annular water jet 19, and the annular air knife 20 are arranged sequentially at intervals, and the guide wheel 23 is arranged at intervals between the hot water spray device 15 and the annular air knife 20. The inner wall degreasing device 44 includes an automatic connector, a recovery box 40, and a high-pressure bubble degreasing system. Both the output end of the high-pressure bubble degreasing system and the inlet end of the recovery box 40 are equipped with quick-connect connectors 36. The automatic connector includes two spaced-apart pneumatic claws 37, with silicone pads embedded on their inner sides. The pneumatic claws 37 can engage the quick-connect connectors 36 within the openings at both ends of the titanium tube 2. Those skilled in the art will understand that this device can directly degrease the titanium tube 2 after it exits the rolling mill 41, enabling continuous production while avoiding contamination caused by the transfer of rolling oil along with the titanium tube 2. This device specifically includes a pre-scraping device 42, an outer wall degreasing device 43, and an inner wall degreasing device 44. The pre-scraping device 42 includes an outer wall scraper 4 and an inner wall scraper 5. The rolled titanium tube 2 can be directly inserted onto the mandrel 3. Since the inner wall scraper 5 has a rod-shaped structure and its end can be detachably connected to the end of the mandrel 3 away from the rolling mill 41, the inner wall scraper 5 can be connected to the tension rod 6. Preferably, an internal thread rod 10 is provided at the end of the tension rod 6, and a suitable threaded hole is provided in the inner wall scraper 5. The titanium tube 2 enters the pre-scraping device 42 through the roller 1. Since the outer wall scraper 4 is annular and passes through the mandrel 3, the inner wall of the outer wall scraper 4 is spaced apart from the mandrel 3, and a nylon scraper 12 is provided on the inner wall. Under the action of the roller 1, the outer wall of the titanium tube 2 directly contacts the nylon scraper 12 to achieve pre-degreasing of the outer wall of the titanium tube 2. The inner wall scraper 5 is provided with a rubber ring 9 on the outer wall near the end of the mandrel 3. The rubber ring can achieve the pre-degreasing of the inner wall of the titanium tube 2 before entering the outer wall degreasing device 43. The outer wall degreasing device 43 includes a hot water spray device 15, a degreasing liquid spray device 16, a brush cleaning device 17, a magnetic polishing degreasing device 18, an annular water jet 19, an annular air knife 20, and a guide wheel 23. The hot water spray device 15, the degreasing liquid spray device 16, the brush cleaning device 17, the magnetic polishing degreasing device 18, the annular water jet 19, and the annular air knife 20 are arranged in sequence at intervals. The guide wheel 23 is arranged at intervals between the hot water spray device 15 and the annular air knife 20, so that the titanium tube 2 can continue to move forward through the action of the guide wheel 23 and maintain the same height position as the exit of the rolling mill 41. The hot water spray device 15, the degreasing liquid spray device 16, and the brush cleaning device 17 all adopt annular structure to achieve cleaning of the outer wall of the titanium tube 2 without dead corners. Meanwhile, in order to ensure the quality of degreasing, it is preferred to use two sets of degreasing liquid spraying device 16 and brush cleaning device 17 arranged at intervals. The brush cleaning device 17 is a detachable structure that can rotate from 0 to 300 r / min. It is selected according to the size range of the rolled titanium tube 2 and has PBT material bristles distributed inside.To meet environmental protection requirements, the hot water spray device 15, degreasing liquid spray device 16, brush cleaning device 17, magnetic polishing degreasing device 18, annular water jet 19, annular air knife 20, and guide wheel 23 can be housed in a shell with openings at both ends. The openings at both ends allow the titanium tube 2 to enter and exit. A degreasing liquid recovery pipe 22, a waste gas collection pipe 24, and a wastewater collection pipe 21 are spaced apart on the upper and lower parts of the shell for environmental control of the external degreasing device. The annular water jet 19 provides 0.6-1 MPa pressure water to rinse the outer wall of the titanium tube 2, and the annular air knife 20 provides 0.3-0.6 MPa compressed air to dry the outer wall of the titanium tube 2. The tube then enters the inner wall degreasing device 44. After being processed by the outer wall degreasing device 43, the semi-finished tube 39 is placed on the guide roller 38. The automatic connector of the inner wall degreasing device 44 is a pneumatic clamp 37, with a silicone pad embedded on the inside of the pneumatic clamp 37, which can automatically and quickly seal and clamp the two ends of the titanium tube 2. The high-pressure bubble degreasing solution output from the high-pressure bubble degreasing system is injected into the inner wall of titanium tube 2 via an automatic connector. The high-pressure bubble degreasing solution contains compressed bubbles, and the impact force of bubble bursting enhances the degreasing effect. After cleaning with the degreasing solution, high-pressure water and compressed air are introduced successively to clean the inner wall of the tube, thus obtaining a degreased tube that meets the requirements.

[0029] Preferably, the outer wall scraper 4 in the above-mentioned device includes a clamping member 13. The clamping member 13 is an annular structure with one open side, and the open end is bent outward. A locking screw 14 passes through the bent end. A groove is provided on the inner wall of the outer wall scraper 4, and the nylon scraper 12 is disposed in the groove. Those skilled in the art will understand that, in order to adapt to the pre-degreasing of different titanium tubes 2, the outer wall scraper 4 is preferably adjustable in diameter. The outer wall scraper 4 includes a clamping member 13, which is an annular structure with one open side, and the open end is bent outward. A locking screw 14 passes through the bent end. In practice, the nylon scraper 12 can be fully contacted with the outer wall of the titanium tube 2 by turning the locking screw 14. Furthermore, a groove is provided on the inner wall of the outer wall scraper 4, and the nylon scraper 12 is disposed in the groove, which limits the nylon scraper 12, prevents it from slipping, and achieves stable operation.

[0030] Preferably, in the above-mentioned device, the nylon scraper 12 has a serrated structure on the outer wall scraper 4 center side, and a felt 11 is provided on the end face. Those skilled in the art will understand that, in order to increase the effective contact between the nylon scraper 12 and the outer wall of the titanium tube 2, it is actually preferred that the nylon scraper 12 has a serrated structure on the outer wall scraper 4 center side. Preferably, the nylon scraper 12 is an open annular sleeve with four annular triangular protrusions on the inner wall, forming annular line contact with the titanium tube 2 to reduce scraping resistance. Its inner diameter is 0.05-0.5 mm larger than the outer diameter of the titanium tube 2 (gap ≤ 0.1 mm), and the material is PA66 nylon with added glass fiber to increase wear resistance. The felt 11 on the end face ensures full contact between the felt 11 and the outer wall of the titanium tube 2, improving degreasing efficiency.

[0031] Preferably, the inner wall scraper 5 in the above-mentioned device is a frustum-shaped conical rod 8, with the small end of the conical rod 8 connected to the mandrel rod 3, and the rubber ring 9 passing through the outer wall of the conical rod 8. Those skilled in the art will understand that, to facilitate the insertion of the titanium tube 2 onto the inner wall scraper 5, it is actually preferred that the inner wall scraper 5 be a frustum-shaped conical rod 8. The conical rod 8 guides and prevents the pit from hitting the inner wall of the titanium tube 2. To facilitate the conical rod's fixation, it is actually preferred that the small end of the conical rod 8 be connected to the mandrel rod 3, and the rubber ring 9 passing through the outer wall of the conical rod 8. The outer side of the rubber ring can directly contact the inner wall of the titanium tube 2, achieving the purpose of degreasing. Preferably, the inner wall scraper 5 is a 100mm long conical rod 8 with a taper of 1:250, and grooves are machined at positions 0.3mm and 0.1mm smaller than the inner diameter of the titanium tube 2 for installing the rubber ring. After installation, an interference fit is achieved between the rubber ring and the inner wall of the titanium tube 2, achieving the effect of physically scraping away the grease from the inner wall of the tube.

[0032] Preferably, in the above-mentioned device, the small end of the inner wall scraper 5 is provided with a connecting thread 7, and the end of the mandrel 3 is provided with a matching threaded hole, and the inner wall scraper 5 and the mandrel 3 are threadedly connected. Those skilled in the art will understand that this device preferably has the inner wall scraper 5 and the mandrel 3 threadedly connected. Specifically, the small end of the inner wall scraper 5 is provided with a connecting thread 7, preferably the small end of the inner wall scraper 5 is stepped, the connecting thread 7 is provided on the outer wall of the end, and a matching threaded hole is provided at the end of the mandrel 3. When the connecting thread is actually screwed into the threaded hole, the outer wall of the tapered end of the inner wall scraper 5 is equal in diameter to the mandrel 3.

[0033] Preferably, the magnetic polishing degreasing device 18 in the above-mentioned apparatus includes a degreasing liquid storage tank 25, a magnetic polishing liquid recovery pipeline 27, and a magnetic polishing tank 28. The magnetic polishing tank 28 is disposed in the degreasing liquid storage tank 25, and rubber guide holes 29 are provided on the side walls at both ends. One end of the magnetic polishing liquid recovery pipeline 27 is connected to the upper side wall of the magnetic polishing tank 28, and the other end is close to the bottom surface of the degreasing liquid storage tank 25, and an electric diaphragm pump is provided on the pipeline. Nylon guide holes 26 are provided on the side walls at both ends of the degreasing liquid storage tank 25, which are coaxial with the rubber guide holes 29. Those skilled in the art will understand that the magnetic polishing degreasing device 18 is further preferably constructed in this way, and actually includes a degreasing liquid storage tank 25, a magnetic polishing liquid recovery pipeline 27, and a magnetic polishing tank 28. Specifically, the magnetic polishing tank 28 is set inside the degreasing liquid storage tank 25, and the magnetic polishing degreasing device 18 is the prior art, that is, a magnetic polishing machine, which mainly performs polishing operations on the titanium tube 2. Rubber guide holes 29 are provided on the side walls at both ends to facilitate the support of the titanium tube 2. One end of the 27 tube is connected to the upper side wall of the magnetic polishing tank 28, and the other end is close to the bottom surface of the degreasing liquid storage tank 25. In practice, an electric diaphragm pump can be used to recover the overflowing degreasing liquid into the magnetic polishing tank 28 through the magnetic polishing liquid recovery pipeline 27. The degreasing liquid storage tank 25 is responsible for storing the magnetic polishing degreasing liquid overflowing from the magnetic polishing tank 28. After the overflowing degreasing liquid reaches a certain amount, it is transferred back to the magnetic polishing tank 28 by the magnetic polishing liquid recovery pipeline 27. The magnetic polishing degreasing liquid includes 3mm steel needles and neutral degreasing liquid. Nylon guide holes 26 are provided on the side walls at both ends of the degreasing liquid storage tank 25, which are coaxial with the rubber guide holes 29 to facilitate the support of the titanium tube 2.

[0034] Preferably, the high-pressure bubble degreasing system in the above-mentioned device includes a water tank 30, a degreasing liquid tank 31, a gas-liquid mixing pump 33, and an air compressor 34. The inlet end of the gas-liquid mixing pump 33 is connected to the outlet ends of the water tank 30, the degreasing liquid tank 31, and the air compressor 34, respectively. The opening and closing of the inlet of the gas-liquid mixing pump 33 is controlled by a valve 32, and a quick-connect fitting 36 is provided at the outlet end of the gas-liquid mixing pump 33. Those skilled in the art will understand that, in a further preferred embodiment, the high-pressure bubble degreasing system includes a water tank 30, a degreasing liquid tank 31, a gas-liquid mixing pump 33, and an air compressor 34. Specifically, the inlet end of the gas-liquid mixing pump 33 is connected to the water tank 30, the degreasing liquid tank 31, and the air compressor 34, respectively. The opening and closing of the inlet of the gas-liquid mixing pump 33 is controlled by a valve 32. To ensure stable inlet pressure, a pressure controller 35 can be added to the connecting pipeline between the air compressor 34 and the gas-liquid mixing pump 33 to limit the inlet pressure of the gas-liquid mixing pump 33. The quick-connector 36 is located at the outlet of the gas-liquid mixing pump 33. The output high-pressure bubble degreasing solution contains compressed bubbles at a pressure of 0.3-0.5 MPa. It is injected into the inner wall of the titanium tube 2 through the quick-connector 36, and the degreasing effect is enhanced by the impact force of the bursting bubbles. After cleaning with the degreasing solution, high-pressure water and compressed air are introduced sequentially by controlling the opening of different valves 32 to achieve cleaning of the inner wall of the tube.

[0035] A method for online degreasing of seamless titanium alloy tubes, comprising any one of the online degreasing devices for seamless titanium alloy tubes as described in claims 1 to 7, comprising the following steps: S1. Physical pre-scraping: An outer wall pre-scraping device and an inner wall pre-scraping device are arranged along the exit line of the mill 41. During the rolling process of titanium tube 2, when titanium tube 2 is fed in, it pushes the rolled titanium tube 2 through the outer wall pre-scraping device. S2. Online external wall degreasing: The pre-scraped titanium tube 2 enters the online external wall degreasing mechanism through a conveying mechanism for external wall degreasing. S3. Online inner wall degreasing: After the outer wall degreasing, the titanium tube 2 is moved to the online inner wall degreasing mechanism for inner wall degreasing. Those skilled in the art will understand that in step S1, the outer / inner wall oil scraping device is selected for the applicable size range of the outer and inner diameters of the rolled titanium tube 2. By arranging the outer wall oil scraper 4 and the inner wall oil scraper 5 along the exit line of the rolling mill 41, during the rolling process of the titanium tube 2, the rolled titanium tube 2 is pushed through the outer wall oil scraper 4 when it is fed in. By adjusting the gap between the outer wall oil scraper 4 and the outer wall of the tube, the nylon pre-scraper with a low clearance fit with the titanium tube 2 can remove more than 80% of the rolling oil on the outer wall of the titanium tube 2. At the same time, through the inner wall oil scraper 5 connected to the mandrel 3 of the rolling mill 41, the fluororubber ring on the inner wall oil scraper 5 forms an interference fit with the inner wall of the titanium tube 2. As the titanium tube 2 is fed in and extended during the rolling process, it scrapes off more than 70% of the inner wall rolling oil by axial movement relative to the inner wall of the tube. The pre-scraped rolling oil flows back into the lubrication system of the rolling mill 41 through the oil guide groove along the line of the rolling mill 41. In step S2, the pre-scraped titanium tube 2 enters the outer wall degreasing device 43 via a conveying mechanism. The hot water spray device 15 preheats the outer wall of the titanium tube 2 by spraying in hot water at 60-70℃. After passing through the hot water spray device 15, the titanium tube 2 is sprayed with commercial neutral degreasing liquid at 60-70℃ by the degreasing liquid spray device 16. The titanium tube 2, carrying the degreasing liquid, enters the rotating brush cleaning device 17. The high-speed rotating brush cleans the outer wall of the titanium tube 2, and then it passes through the degreasing liquid spray device 16 and the brush cleaning device 17 again for a second cleaning. After cleaning with a brush, the titanium tube 2 enters the magnetic polishing degreasing device. The magnetic polishing process uses a working frequency of 15-30Hz, a polishing rate of 10-30m / min, and a polishing time of 1-3min as process parameters to clean the surface of the titanium tube 2. After magnetic polishing, the titanium tube 2 enters a cleaning mechanism with two sets of annular water jets 19, where it is cleaned three times by high-pressure water rinsing at 0.6-1MPa. Finally, annular air knives 20, powered by compressed air at 0.4-0.6MPa, remove residual water from the outer wall of the tube. In step S3, the titanium tube 2, after degreasing of the outer wall, moves to the online inner wall degreasing mechanism. The automatic connector is a pneumatic clamp 37 (the clamp is covered with nylon to avoid clamping the semi-finished tube 39) which quickly clamps the titanium tube 2. Quick-connect connectors 36 are used at both ends of the semi-finished tube 39 to seal both ends. One end is connected to the degreasing liquid input end, and the other end is connected to the recovery tank. Start the degreasing system on the inner wall of the semi-finished pipe 39. The flowing 60-70℃ neutral degreasing liquid enters the inner wall of the semi-finished pipe 39 and continuously flushes for 5 minutes. After flushing, start the gas-liquid mixing pump 33 to provide high-pressure bubble neutral degreasing liquid and continuously flush for 2-3 minutes. Then switch to high-pressure water circuit and continuously flush for 1-2 minutes. Finally, use 0.4-0.6MPa compressed air to remove the moisture inside the pipe.

[0036] Preferably, in step S2 of the above method, the hot water sprayer preheats the outer wall of the titanium tube 2 by spraying in hot water at 60-70℃. After the titanium tube 2 passes through the hot water spray device 15, a commercially available neutral degreasing solution at 60-70℃ is sprayed into it by the degreasing solution spray device 16. The titanium tube 2, carrying the degreasing solution, enters the rotating brush cleaning device 17. The high-speed rotating brush cleans the outer wall of the titanium tube 2. Then, it passes through the degreasing solution spray device 16 and the brush cleaning device 17 again for a second cleaning. After the brush cleaning is completed, The titanium tube 2 enters the magnetic polishing degreasing device 18. The magnetic polishing degreasing device 18 uses a working frequency of 15-30Hz, a polishing rate of 10-30m / min, and a polishing time of 1-3min as process parameters to clean the surface of the titanium tube 2. After magnetic polishing, the titanium tube 2 enters the annular water jet 19 for cleaning. It is cleaned three times by rinsing with 0.6-1MPa high-pressure water. Finally, the annular air knife 20, which provides air source with 0.4-0.6MPa compressed air, removes the residual water on the outer wall of the titanium tube 2.

[0037] Preferably, in step S3 of the above method, the pipe inner wall degreasing system is started, and the flowing 60-70℃ neutral degreasing liquid enters the inner wall of the titanium pipe 2 and continuously flushes for 5 minutes. After flushing, the gas-liquid mixing pump 33 is started to provide high-pressure bubble neutral degreasing liquid and continuously flushes for 2-3 minutes. Then, the high-pressure water circuit is switched and continuously flushes for 1-2 minutes. Finally, the water in the pipe is removed by 0.4-0.6MPa compressed air.

[0038] Example 1 For cold-rolled seamless tubes with a diameter of φ12×2×2500mm, a nylon scraper 12 with an inner diameter of 12mm and a tapered rod 8 with an outer diameter of φ9.9mm are selected. After installing the rubber ring, the outer diameter of the tapered rod 8 is φ9.9-10.1mm. The mandrel rod 3 is φ9.5mm. The external degreasing brush cleaning device 17 is replaced to fit the outer diameter of the tube of 12mm. The pneumatic structure of the internal degreasing device is replaced to fit the tube of φ12×2mm. After changing the tooling and adjusting the equipment, during the rolling process, adjust the locking screw 14 of the nylon scraper 12 on the outer wall of the pipe to achieve a small clearance fit between the two outer wall scrapers 4 and the rolled pipe, so that the pre-scraping amount of oil on the outer wall reaches more than 80%. At the same time, use the inner wall scraper 5 to remove more than 70% of the rolling oil from the inner wall of the pipe. After rolling 10 pipes, check whether the rubber ring on the inner wall scraper 5 is damaged. If it is damaged, replace it in time. After rolling 100 pipes, check the outer wall nylon scraper 12. If it is damaged, replace the nylon tooling. After the pipe is pre-scraped of oil, it is transferred to the outer wall degreasing device 43 by the conveying device. The hot water spray device 15 pre-cleans and preheats the surface of the pipe. Then, the pipe is degreased and cleaned by two degreasing spray devices and a rotating brush. Subsequently, the outer surface of the pipe is deeply cleaned by the magnetic polishing degreasing device 18. The magnetic polishing tank 28 is selected with a working frequency of 20Hz, a polishing rate of 15 m / min, and a polishing time of 2min as process parameters. After magnetic polishing, the pipe is then rinsed with high-pressure water. Finally, the pipe surface is removed by the annular air knife 20. After the external degreasing of the pipe is completed, it is transferred to the internal degreasing device 44. The internal control of the pipe is achieved by starting the pneumatic chuck 37 and quick-connect coupling 36, connecting the inner hole of the pipe to the internal degreasing pipeline. First, it switches to 60-70℃ neutral degreasing liquid. The flowing neutral degreasing liquid rinses the inner wall of the pipe, preheats the rolling oil on the pipe wall and emulsifies or dissolves the grease on the pipe wall. The rinsing continues for more than 5 minutes. Controlled by valve 32, it switches to high-pressure bubble mixture. The bubbles in the solution burst during the rinsing process, promoting deep degreasing of the pipe wall. The rinsing continues for 2-3 minutes. Then, it switches to high-pressure water to rinse the inner wall of the pipe to remove the degreasing liquid residue. Finally, the residual moisture is removed by high-pressure air. The whole process can be automatically controlled. After online degreasing is completed, a dry cold-rolled pipe is obtained.

Claims

1. An apparatus for on-line degreasing of seamless titanium alloy tubes, characterized in that The application relates to a pre-oil scraping device (42), an outer wall degreasing device (43) and an inner wall degreasing device (44). The outer wall degreasing device (43) comprises a hot water spraying device (15), a degreasing liquid spraying device (16), a brush cleaning device (17), a magnetic force throwing degreasing device (18), an annular water cutter (19), an annular air knife (20) and a guide wheel (23); the hot water spraying device (15), the degreasing liquid spraying device (16), the brush cleaning device (17), the magnetic force throwing degreasing device (18), the annular water cutter (19) and the annular air knife (20) are sequentially and spacedly arranged, and the guide wheel (23) is spacedly arranged between the hot water spraying device (15) and the annular air knife (20). The inner wall degreasing device (44) comprises an automatic joint, a recovery box (40) and a high-pressure bubble degreasing system, the output end of the high-pressure bubble degreasing system and the feeding end of the recovery box (40) are provided with quick plug joints (36), the automatic joint comprises two spacedly arranged pneumatic clamping jaws (37), the inner side of the pneumatic clamping jaw (37) is embedded with silica gel pads, and the pneumatic clamping jaw (37) can clamp the quick plug joint (36) in the opening of the titanium pipe (2). The outer wall oil scraper (4) comprises a pressing part (13) which is an open ring structure with the opening end bent outward, and the bent end is provided with a locking screw (14); the inner wall of the outer wall oil scraper (4) is clamped with a groove, and the nylon oil scraper (12) is arranged in the groove.

2. The apparatus for on-line degreasing of seamless pipe of titanium alloy as claimed in claim 1, wherein: The nylon oil scraper (12) is sawtooth-shaped on the outer wall oil scraper (4) and is provided with a felt (11) on the end face.

3. A titanium alloy seamless pipe on-line defatting device as claimed in claim 2, wherein: The inner wall oil scraper (5) is a conical rod (8) in the shape of a circular truncated cone, the small end of the conical rod (8) is connected with the mandrel rod (3), and the rubber ring (9) is arranged on the outer wall of the conical rod (8).

4. The apparatus for on-line degreasing of titanium alloy seamless tube as claimed in claim 1, wherein: The small end of the inner wall oil scraper (5) is provided with a connecting thread, the end of the mandrel rod (3) is provided with a matched threaded hole, and the inner wall oil scraper (5) is threadedly connected with the mandrel rod (3).

5. A titanium alloy seamless pipe on-line defatting device as claimed in claim 4, wherein: ​ 6. The apparatus for on-line degreasing of titanium alloy seamless tube as claimed in claim 1, wherein: The magnetic force polishing degreasing device (18) comprises a degreasing liquid storage tank (25), a magnetic force polishing degreasing liquid recovery pipeline (27) and a magnetic force polishing tank (28), the magnetic force polishing tank (28) is arranged in the degreasing liquid storage tank (25), rubber guide holes (29) are arranged on the two end side walls of the magnetic force polishing tank (28), one end of the magnetic force polishing degreasing liquid recovery pipeline (27) is arranged in communication with the upper side wall of the magnetic force polishing tank (28), the other end is close to the bottom surface of the degreasing liquid storage tank (25), and an electric diaphragm pump is arranged on the pipeline; nylon guide holes (26) are arranged on the two end side walls of the degreasing liquid storage tank (25) and are coaxially arranged with the rubber guide holes (29).

7. The apparatus for on-line degreasing of titanium alloy seamless tube as claimed in claim 1, wherein: The high-pressure bubble degreasing system comprises a water tank (30), a degreasing liquid tank (31), a gas-liquid mixing pump (33) and an air compressor (34), the inlet end of the gas-liquid mixing pump (33) is connected with the outlet ends of the water tank (30), the degreasing liquid tank (31) and the air compressor (34) respectively, the on-off of the gas-liquid mixing pump (33) inlet is controlled through a valve, and a quick connector (36) is arranged at the outlet end of the gas-liquid mixing pump (33).

8. A method for on-line defatting of a seamless tube of a titanium alloy, characterized in that, The steps of the online degreasing device for the titanium alloy seamless pipe according to any one of claims 1 to 7 are as follows: S1. Physical pre-scraping, arranging outer wall pre-scraping devices and inner wall pre-scraping devices along the line at the outlet of the rolling mill (41), and pushing the rolled titanium pipe (2) to pass through the outer wall pre-scraping devices when the titanium pipe (2) is rolled and fed; S2. Online outer wall degreasing, the pre-scraped titanium pipe (2) enters the online outer wall degreasing mechanism to perform outer wall degreasing through a conveying mechanism; S3. Online inner wall degreasing, the titanium pipe (2) after outer wall degreasing is moved to the online inner wall degreasing mechanism to perform inner wall degreasing.

9. A method of on-line defatting of titanium alloy seamless tube as claimed in claim 8, wherein: In step S2, the hot water sprayer sprays 60-70℃ hot water to preheat the outer wall of the titanium pipe (2), after the titanium pipe (2) passes through the hot water spraying device (15), 60-70℃ commercial neutral degreasing liquid is sprayed by the degreasing liquid spraying device (16), the titanium pipe (2) with the degreasing liquid enters the rotating brush cleaning device (17) to clean the outer wall of the titanium pipe (2), then the titanium pipe (2) passes through the degreasing liquid spraying device (16) and the brush cleaning device (17) again to perform secondary cleaning, after the brush cleaning is completed, the titanium pipe (2) enters the magnetic force polishing degreasing device (18), the magnetic force polishing degreasing device (18) selects the process parameters of a working frequency of 15-30Hz, a polishing speed of 10-30m / min and a polishing time of 1-3min to clean the surface of the titanium pipe (2), after the magnetic force polishing, the titanium pipe (2) enters the annular water jet (19) for cleaning, is washed by 0.6-1MPa high-pressure water for three times, and finally the annular air knife (20) provided with air source by 0.4-0.6MPa compressed air removes the residual water on the outer wall of the titanium pipe (2).

10. A method of on-line defatting of titanium alloy seamless tube as claimed in claim 8, wherein: In step S3, the pipe inner wall defatting system is started, and the flowing 60-70°C neutral defatting solution enters the inner wall of the titanium pipe (2) and continuously flushes for 5 min. After the flushing, the gas-liquid mixing pump (33) is started to provide high-pressure bubble neutral defatting solution, and continuous flushing is performed for 2-3 min. Subsequently, the high-pressure water path is switched, and continuous flushing is performed for 1-2 min. Finally, 0.4-0.6 MPa compressed air is used to remove the water in the pipe.

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