Passivation device for seamless steel pipe surface treatment

Abstract

The invention relates to the technical field of steel pipe passivation treatment, and discloses a passivation device for seamless steel pipe surface treatment.The passivation device comprises a passivation tank, a bearing assembly and a lifting assembly, the bearing assembly and the lifting assembly are arranged above the passivation tank, the bearing assembly comprises a first frame and a second frame which are arranged up and down, and the lifting assembly comprises a support, a hydraulic rod, a connecting frame, a supporting frame and a bearing plate; the bearing plate is provided with an exchange mechanism used for conducting intermodulation on the positions of the first frame and the second frame, the exchange mechanism comprises a connecting frame, a spline rod, a fixed sliding block and two sets of guide grooves, and the bearing plate is further provided with a driving unit. According to the method, the positions of the upper steel pipe and the lower steel pipe are exchanged, the steel pipe originally located on the lower layer can be prevented from being excessively soaked after being exchanged to the upper layer, the integrity and stability of a passive film are guaranteed, and the upper steel pipe which is originally prone to being thin in passive film thickness and poor in compactness can also be soaked for enough time after the positions of the upper steel pipe are exchanged.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe passivation treatment, in particular to a passivation device for surface treatment of seamless steel pipes. Background Art

[0002] In the modern industrial field, seamless steel pipes, as key basic materials, are widely used in many industries such as petrochemicals, natural gas transportation, building structures, and machinery manufacturing. In order to effectively improve the corrosion resistance of seamless steel pipes, passivation treatment has become an indispensable surface treatment process in the industry. Passivation refers to the use of chemical methods to drive the metal atoms on the surface of the steel pipe to react with the appropriate specific passivating agent to form a dense, stable and highly adhesive passivation film, thereby isolating the external corrosive medium and protecting the steel pipe matrix.

[0003] The existing publication number CN220166277U discloses a seamless steel pipe passivation treatment equipment, including a working box, a base is provided on one side of the working box, a rotating component is provided between the working box and the base, a grinding fixed plate is provided on the other side of the working box, two sets of protective components are provided on the upper part of the working box, suction components are provided on both sides of the grinding component, the suction component is arranged between the working box and the base, a grinding component is provided on the upper part of the protective component, a residue collection box is provided at one end of the working box away from the rotating component, U-shaped grooves are provided on the box walls at both ends of the working box, a passivation part is provided in the working box, the passivation part includes a liquid storage tank, the liquid storage tank is connected to a booster pump, the booster pump is connected to a nozzle, the booster pump is connected to the nozzle through a connecting pipe, and the nozzle is arranged on the inner wall of the working box, although the above technical scheme can first grind the seamless steel pipe to make the surface of the seamless steel pipe smooth before passivation, it has the advantage of ensuring the passivation effect.

[0004] However, in the prior art, the passivation of seamless steel pipes is usually carried out by immersion or spraying. In the immersion passivation process, a plurality of seamless steel pipes are usually stacked together and placed together in a passivation tank filled with passivation liquid. However, when the steel pipes are stacked in batches, the steel pipes inevitably overlap with each other and are limited by the spatial layout of the passivation tank, resulting in inconsistent contact time of the steel pipes when entering the passivation liquid. Specifically, the steel pipes at the lower layer will first contact with the passivation liquid and immediately undergo a passivation reaction from the moment they are immersed in the passivation tank, while the steel pipes at the upper layer will not be exposed to the passivation liquid. Not only will the steel pipe come into contact with the passivation liquid relatively late, but it will also be blocked by the lower steel pipe, resulting in insufficient contact time with the passivation liquid. When the steel pipe is subsequently taken out of the passivation tank, the steel pipe on the upper layer will also be released from contact with the passivation liquid earlier, resulting in the upper steel pipe having a short contact time with the passivation liquid and insufficient reaction, resulting in a thin passivation film with poor density. The lower steel pipe may be immersed for too long, resulting in local accumulation of the passivation film, increasing the risk of falling off, and other problems. Therefore, a new type of passivation device for surface treatment of seamless steel pipes is needed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a passivation device for surface treatment of seamless steel pipes, so as to solve the problem proposed in the above-mentioned background technology that when steel pipes are stacked in batches, there is inevitable overlap between the steel pipes and the spatial layout of the passivation tank is limited, resulting in inconsistent contact time of the steel pipes when entering the passivation liquid.

[0006] The present invention provides a passivation device for surface treatment of seamless steel pipes, which adopts the following technical solution:

[0007] A passivation device for surface treatment of seamless steel pipes, comprising a passivation tank, a bearing assembly arranged above the passivation tank for loading the steel pipe, and a lifting assembly for controlling the lifting of the bearing assembly;

[0008] The bearing assembly comprises a first frame and a second frame arranged vertically;

[0009] The lifting assembly includes a bracket symmetrically arranged along the length direction of the passivation tank, a hydraulic rod arranged above the bracket, a connecting frame connected to the output end of the hydraulic rod, a supporting frame connected to the connecting frame, and a bearing plate integrally arranged with the supporting frame, wherein the bearing plate is provided with a switching mechanism for interchanging the positions of the first frame and the second frame;

[0010] The exchange mechanism comprises a connection frame fixedly arranged at both ends of the first frame and the second frame, a support plate integrally arranged with the connection frame, a spline rod fixedly connected with the support plate, a sliding block fixed on the spline rod, and two groups of guide grooves provided on the surface of each group of bearing plates, wherein the sliding block is slidably connected in the corresponding guide grooves, wherein the two groups of guide grooves provided on the same bearing plate are arranged diagonally, and each group of guide grooves comprises a parallel section, an inclined section, a vertical section and a straight section;

[0011] Two groups of reciprocating screw rods are rotatably arranged on the surface of each group of the bearing plates. Bushing blocks are arranged on the reciprocating screw rods, and the spline rods are inserted into the corresponding bushing blocks.

[0012] Furthermore, a driving unit is also provided on the carrier plate, and the driving unit includes a first bevel gear fixed on the reciprocating screw and a second bevel gear meshing with the first bevel gear, and the second bevel gear is rotatably arranged on the carrier plate through a transmission shaft, and the transmission shaft penetrates to the back of the carrier plate, wherein a first transmission member is provided between the two sets of transmission shafts arranged on the same carrier plate;

[0013] A motor is fixedly mounted on the upper surface of each group of the support frames, and the output end of the motor is fixedly connected to a driving shaft through a coupling, and a second transmission member is provided between the driving shaft and the corresponding transmission shaft. When the motor is started, the reciprocating screw is rotated through the transmission cooperation of the driving shaft, the second transmission member, the transmission shaft, the second bevel gear and the first bevel gear, and at the same time, the movement of the connecting frame, the support plate, the spline rod and the sliding block is controlled, and then the upper and lower positions of the first frame and the second frame are mutually adjusted through the guidance of the guide groove.

[0014] Furthermore, an abutment unit is provided on the carrier plate, and the abutment unit includes a first gear diagonally arranged on the carrier plate, and the first gear is rotatably arranged on the carrier plate through a rotating shaft, and the rotating shaft passes through the back side of the carrier plate, and a third transmission member is provided between the third transmission shaft and the corresponding transmission shaft, and a first tooth plate meshing with the first gear is fixed on the spline rod.

[0015] Further, the first frame and the second frame are both provided with a dumping mechanism, the dumping mechanism comprises a hollow plate respectively provided in the first frame and the second frame for placing the steel pipe, one end of the hollow plate is rotatably connected with the first frame and the second frame through a shaft, one end of the shaft passes through the outside of the first frame and the second frame and is fixed with a second gear, the passivation groove is provided with a second tooth plate meshing with the second gear, and the second tooth plate is fixed in the passivation groove through a fixing frame;

[0016] A plurality of groups of second springs are arranged between the two sides of the bottom end of the hollow plate and the bottom ends of the inner walls of the first frame and the second frame.

[0017] Furthermore, a plurality of filtrate ports are provided on both sides of the bottom ends of the inner walls of the first frame and the second frame.

[0018] Furthermore, a protective cover is provided on the back side of the supporting plate, and the protective cover is used to shield the transmission shaft, the first transmission member, the second transmission member, the rotating shaft and the third transmission member.

[0019] Furthermore, a protrusion is fixed on the sleeve block, and a track groove for the protrusion to slide is formed on the bearing plate.

[0020] Furthermore, a first spring is provided on the spline rod, and two ends of the first spring are respectively fixed between the support plate and the sleeve block.

[0021] Furthermore, the sleeve block is provided with a spline groove for the spline rod to pass through.

[0022] Furthermore, the sleeve block is provided with a notch for the first tooth plate to pass through.

[0023] Beneficial effects of the present invention:

[0024] 1. By setting a switching mechanism and a driving unit, after the steel pipe is immersed in the passivation tank for a certain period of time, it is lifted by a lifting assembly, and then under the coordinated action of the switching mechanism and the driving unit, the first frame and the second frame are controlled to interchange the upper and lower positions, so that the first frame originally at the upper part moves to the lower part, and the second frame originally at the lower part moves to the upper part, and then the lifting assembly is used to immerse it in the passivation tank for a certain period of time. By exchanging the positions of the steel pipes in the upper and lower layers, the steel pipes originally at the lower layer, which are prone to local accumulation and growth of the passivation film due to long immersion time, are Steel pipes with a high risk of falling off can avoid excessive immersion after being exchanged to the upper layer, thus ensuring the integrity and stability of the passivation film. The upper steel pipes, which were originally prone to thin passivation film thickness and poor density, can also get enough immersion time after position exchange, thus forming a passivation film with appropriate thickness, good density and strong adhesion. Through the above operation, each steel pipe can have a relatively uniform immersion time in the passivation liquid, effectively avoiding the situation where some steel pipes have insufficient passivation film formation due to too short contact time, and some steel pipes have abnormal accumulation of passivation film due to too long contact time.

[0025] 2. By providing a dumping mechanism, the first frame and the second frame are controlled to flip over the hollow plate during the rising process under the action of the dumping mechanism to tilt the steel pipe so that the passivation liquid on the inner wall flows out, which can effectively remove the residual liquid and improve the passivation quality of the steel pipe. It can avoid the passivation liquid on the inner wall of the steel pipe from being unable to be discharged and accumulating therein, resulting in excessive growth of the local passivation film on the inner wall of the steel pipe due to long-term immersion in excessive passivation liquid, making the structure of the passivation film uneven, such as local thickening and looseness. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 It is a three-dimensional structural schematic diagram of the bearing assembly, the lifting assembly and the exchange mechanism of the present invention;

[0028] Figure 3 It is a front view structural diagram of the bearing plate, the exchange mechanism, the driving unit and the abutment unit of the present invention;

[0029] Figure 4 It is a schematic diagram of the three-dimensional structure of the support plate, the spline rod, the sliding block, the sleeve block and the third transmission member of the present invention;

[0030] Figure 5 It is a side view of the structure of the connecting frame, the supporting frame, the bearing plate, the first frame, the second frame, the connecting frame, the supporting plate, the spline rod, the sliding block and the sleeve block of the present invention;

[0031] Figure 6It is a schematic diagram of the three-dimensional structure of the support frame, the bearing plate, the connection frame, the support plate, the spline rod, the sliding block, the guide groove, the reciprocating screw rod, the reciprocating screw rod, the driving unit and the abutting unit of the present invention;

[0032] Figure 7 It is a schematic diagram of the three-dimensional structure of the bearing plate and the guide groove of the present invention;

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of the support frame, the bearing plate, the driving unit and the abutting unit of the present invention;

[0034] Fig. 9 It is an exploded schematic diagram of the three-dimensional structure of the support frame, the bearing plate, the abutment unit and the protective cover of the present invention;

[0035] Fig.10 A schematic diagram showing a front view of the first frame and the second frame of the present invention in a state of structural exchange;

[0036] Fig.11 It is a schematic diagram of the three-dimensional structure of the first frame and the dumping mechanism of the present invention;

[0037] Fig.12 It is a schematic exploded view of the three-dimensional structure of the first frame and the dumping mechanism of the present invention.

[0038] Fig.13 It is a schematic diagram of the three-dimensional structure of the passivation groove, the second tooth plate and the fixing frame of the present invention.

[0039] In the figure:

[0040] 1. Passivation groove; 2. Carrying assembly; 21. First frame; 22. Second frame; 3. Lifting assembly; 31. Bracket; 32. Hydraulic rod; 33. Connecting frame; 34. Support frame; 35. Carrying plate; 4. Switching mechanism; 41. Connecting frame; 42. Support plate; 43. Spline rod; 431. First spring; 44. Sliding block; 45. Guide groove; 451. Parallel section; 452. Inclined section; 453. Vertical section; 454. Straight section; 46. Reciprocating screw rod; 47. Bushing block; 471. Protrusion; 472. Spline Keyway; 473, notch; 5, driving unit; 51, first bevel gear; 52, second bevel gear; 53, transmission shaft; 54, first transmission member; 55, motor; 56, driving shaft; 57, second transmission member; 58, protective cover; 6, abutment unit; 61, first gear; 62, rotating shaft; 63, third transmission member; 64, first tooth plate; 7, dumping mechanism; 71, hollow plate; 72, shaft; 73, second gear; 74, second tooth plate; 75, fixing frame; 76, second spring; 77, filtrate outlet. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0042] Reference Figure 1-Figure 2 A passivation device for surface treatment of seamless steel pipes comprises a passivation tank 1, into which a pump can be used to inject a passivation solution.

[0043] It also includes a bearing assembly 2 arranged above the passivation tank 1 for loading the steel pipe and a lifting assembly 3 for controlling the bearing assembly 2 to rise and fall.

[0044] The bearing assembly 2 includes a first frame 21 and a second frame 22 which are arranged vertically.

[0045] The lifting assembly 3 includes a bracket 31 symmetrically arranged along the length direction of the passivation tank 1, a hydraulic rod 32 arranged above the bracket 31, a connecting frame 33 connected to the output end of the hydraulic rod 32, a support frame 34 connected to the connecting frame 33, and a bearing plate 35 integrally arranged with the support frame 34, wherein the hydraulic rod 32 is installed above each group of brackets 31 through a mounting plate, the hydraulic rod 32 controls the connecting frame 33 to move up and down, and the connecting frame 33 synchronously controls the support frame 34 and the bearing plate 35 to move up and down.

[0046] Reference Figure 2-Figure 7 The load-bearing plate 35 is provided with a switching mechanism 4 for interchanging the upper and lower positions of the first frame 21 and the second frame 22. Specifically, the switching mechanism 4 includes a connection frame 41 fixedly arranged at both ends of the first frame 21 and the second frame 22, a support plate 42 integrally arranged with the connection frame 41, a spline rod 43 fixedly connected to the support plate 42, a sliding block 44 fixed to the end of the spline rod 43 away from the support plate 42, and two groups of guide grooves 45 provided on the surface of each group of load-bearing plates 35. The sliding block 44 is slidably connected in the corresponding guide groove 45, wherein the two groups of guide grooves 45 provided on the same load-bearing plate 35 are connected to each other. The guide grooves 45 are arranged diagonally, and each group of guide grooves 45 includes a parallel section 451, an inclined section 452, a vertical section 453 and a straight section 454. The parallel section 451, the inclined section 452, the vertical section 453 and the straight section 454 are connected to each other. The sliding block 44 can slide along the parallel section 451, the inclined section 452, the vertical section 453 and the straight section 454. When the sliding block 44 is in the initial section of the parallel section 451, the first frame 21 is above the second frame 22. When the sliding block 44 is in the final section of the straight section 454, the upper and lower positions of the first frame 21 and the second frame 22 are interchanged.

[0047] Specifically, the switching mechanism 4 also includes two groups of reciprocating screw rods 46 rotatably arranged on the surface of each group of bearing plates 35, and the two groups of reciprocating screw rods 46 are staggered up and down. The ends of the two groups of reciprocating screw rods 46 that are close to each other are each provided with a sleeve block 47, and the spline rod 43 is movably inserted in the corresponding sleeve block 47. The sleeve block 47 is provided with a spline groove 472 for the spline rod 43 to pass through. With the rotation of the reciprocating screw rod 46, the sleeve block 47 moves from one end of the reciprocating screw rod 46 to the other end. While the sleeve block 47 moves, it can control the connection frame 41, the support plate 42, the spline rod 43 and the sliding block 44 to move. When the sliding block 44 slides from the initial section of the parallel section 451 to the parallel section 451 When the sleeve 47 is at the intersection of the connecting frame 41, the support plate 42, the spline rod 43 and the sliding block 44, the sliding block 44 can be guided by the inclined section 452 to control the spline rod 43 to move in the corresponding spline groove 472 to limit the movement, so that the first frame 21 originally at the top moves downward, and the second frame 22 originally at the bottom moves upward. As the reciprocating screw 46 continues to rotate, when the sleeve block 47 moves to the other end of the reciprocating screw 46, it moves in the opposite direction. At this time, the sleeve block 47 continues to control the movement of the connecting frame 41, the support plate 42, the spline rod 43 and the sliding block 44, so that the sliding block 44 slides along the direction of the straight section 454, thereby realizing the mutual adjustment of the upper and lower positions of the first frame 21 and the second frame 22.

[0048] A first spring 431 is provided on the spline rod 43 , and two ends of the first spring 431 are respectively fixed between the support plate 42 and the sleeve block 47 . The first spring 431 is used to improve the stability of the spline rod 43 when it moves up and down.

[0049] A protrusion 471 is fixed on the sleeve block 47, and a track groove for the protrusion 471 to slide is opened on the bearing plate 35. When the reciprocating screw rod 46 rotates, the protrusion 471 slides in the track groove to guide the sleeve block 47.

[0050] It should be noted that both ends of each set of reciprocating screw rods 46 are rotatably connected to support seats via bearings. The support seats are fixed on the surface of the bearing plate 35 , and the support seats are used to support the reciprocating screw rods 46 .

[0051] Reference Figure 8-Figure 10 A driving unit 5 for controlling the rotation of the reciprocating screw 46 is also provided on the supporting plate 35. Specifically, the driving unit 5 includes a first bevel gear 51 fixed on the reciprocating screw 46 and a second bevel gear 52 meshing with the first bevel gear 51. The second bevel gear 52 is rotatably provided on the supporting plate 35 through a transmission shaft 53. The transmission shaft 53 passes through the back side of the supporting plate 35, wherein a first transmission member 54 is provided between the two sets of transmission shafts 53 provided on the same supporting plate 35.

[0052] A motor 55 is fixedly mounted on the upper surface of each support frame 34. The output end of the motor 55 is fixedly connected to a drive shaft 56 through a coupling. A second transmission member 57 is provided between the drive shaft 56 and the corresponding transmission shaft 53. When the motor 55 is started, the reciprocating screw 46 is rotated through the transmission cooperation of the drive shaft 56, the second transmission member 57, the transmission shaft 53, the second bevel gear 52 and the first bevel gear 51, and the connecting frame 41, the support plate 42, the spline rod 43 and the sliding block 44 are controlled to move. Then, the guide groove 45 guides the guide member 57 to move the guide member 57. Now, regarding the mutual adjustment of the upper and lower positions of the first frame 21 and the second frame 22, it should be explained that the first bevel gear 51 is fixed at the end away from the two sets of reciprocating screws 46, and the second bevel gear 52 is meshed at the side away from the two sets of first bevel gears 51. When the motor 55 is started, through the transmission cooperation of the second transmission member 57 and the first transmission member 54, the two sets of transmission shafts 53 arranged on the same supporting plate 35 drive the second bevel gear 52 to rotate in the same direction. At this time, the two sets of reciprocating screws 46 rotating on the same supporting plate 35 rotate in opposite directions.

[0053] In the traditional seamless steel pipe passivation device, especially when the immersion method is adopted, the problem of uneven contact of the steel pipe in the passivation solution is often faced. Since the steel pipes are stacked together, they inevitably overlap with each other and are limited by the spatial layout of the passivation tank 1, so that the contact time between the steel pipes on different layers and the passivation solution is significantly different. In the present invention, the first frame 21 and the second frame 22 are used to load the steel pipe. After the steel pipe is immersed in the passivation tank 1 for a certain period of time, the lifting component 3 is used to lift it. Then, under the coordinated action of the switching mechanism 4 and the driving unit 5, the first frame 21 and the second frame 22 are accurately controlled to interchange the upper and lower positions, so that the first frame 21 originally at the top moves to the bottom, and the second frame 22 originally at the bottom moves to the top, thereby achieving the upper and lower positions of the first frame 21 and the second frame 22. The interchange of the positions of the lower steel pipes can prevent the steel pipes that were originally in the lower layer and were prone to local accumulation of the passivation film and increased risk of falling off due to long immersion time from being over-immersed after being exchanged to the upper layer, thereby ensuring the integrity and stability of the passivation film. The upper steel pipes that were originally prone to thin passivation film thickness and poor density can also obtain sufficient immersion time after the position interchange, thereby forming a passivation film with appropriate thickness, good density and strong adhesion. Through the above operation, each steel pipe can have a relatively uniform immersion time in the passivation solution, effectively avoiding the situation that some steel pipes have insufficient passivation film formation due to too short contact time, and some steel pipes have abnormal accumulation of passivation film due to too long contact time, making the passivation effect of the whole batch of steel pipes more uniform and consistent, greatly improving the stability of product quality;

[0054] Moreover, in order to make the passivation treatment of steel pipes uniform, the traditional immersion passivation treatment requires workers to frequently adjust the position of steel pipes to ensure uniform immersion. The operating environment is harsh and there are risks of corrosion from the passivation liquid and damage from volatile gases. Through the cooperation of the lifting component 3, the switching mechanism 4 and the drive unit 5, the whole process is mechanized and automated. Workers only need to put the steel pipes on the shelves before starting the equipment and remove the finished products after completion. This can greatly reduce the contact time with the passivation liquid and corrosive gases, and the labor intensity drops sharply. At the same time, the scheme relies on the first frame 21 and the second frame 22, and cooperates with the lifting component 3, the switching mechanism 4 and the drive unit 5 to realize flexible position replacement operations and has universality. For example, after the passivation treatment, it can also directly transfer to other processing links such as cleaning and drying, while traditional equipment can often only perform a single function, resulting in the need for subsequent manual intervention and transfer, which reduces the overall production efficiency.

[0055] Further, see Figure 8-Figure 10 The bearing plate 35 is also provided with an abutment unit 6. Specifically, the abutment unit 6 includes a first gear 61 diagonally arranged on the bearing plate 35. The first gear 61 is rotatably arranged on the bearing plate 35 through a rotating shaft 62. The rotating shaft 62 penetrates the back of the bearing plate 35 and is provided with a third transmission member 63 between the rotating shaft 62 and the corresponding transmission shaft 53. A first toothed plate 64 meshing with the first gear 61 is fixed on the spline rod 43. When the motor 55 is started, the transmission shaft 53 is controlled to rotate through the transmission of the second transmission member 57 and the first transmission member 54. Through the transmission cooperation of the third transmission member 63, the two sets of rotating shafts 62 on the same bearing plate 35 can be controlled to rotate in the same direction, thereby making the two sets of rotating shafts 62 arranged on the same bearing plate 35 rotate in the same direction. The two groups of first gears 61 on the plate 35 rotate in the same direction. When the sliding block 44 slides along the inclined section 452 to the intersection of the inclined section 452 and the vertical section 453, since the spline rod 43 moves along the spline groove 472 at the same time, the first tooth plate 64 can engage with the first gear 61. At this time, as the first gear 61 rotates, the spline rod 43 can be controlled to continue to move in the spline groove 472, and the sliding block 44 slides along the vertical section 453 to the intersection of the vertical section 453 and the straight section 454. Then, when the reciprocating screw 46 continues to rotate and the sleeve block 47 moves in the opposite direction, the sliding block 44 can stably slide in the direction of the straight section 454.

[0056] Among them, a notch 473 is also opened on the sleeve block 47 for the first tooth plate 64 to pass through, and the notch 473 is connected with the spline groove 472. When the first tooth plate 64 is engaged with the first gear 61, the spline rod 43 can continue to move in the spline groove 472, and the first tooth plate 64 can move in the notch 473.

[0057] It should be noted that a protective cover 58 is also provided on the back of the supporting plate 35, and the protective cover 58 is used to shield the transmission shaft 53, the first transmission member 54, the second transmission member 57, the rotating shaft 62 and the third transmission member 63. When the supporting plate 35 is immersed in the passivation tank 1, the transmission shaft 53, the first transmission member 54, the second transmission member 57, the rotating shaft 62 and the third transmission member 63 can be sealed and protected by the protective cover 58 to prevent the first transmission member 54, the second transmission member 57 and the third transmission member 63 from directly contacting the passivation liquid.

[0058] Reference Figure 11-13 , the first frame 21 and the second frame 22 are both provided with a dumping mechanism 7. Specifically, the dumping mechanism 7 includes a hollow plate 71 for placing steel pipes, which is respectively arranged in the first frame 21 and the second frame 22. One end of the hollow plate 71 is rotatably connected to the first frame 21 and the second frame 22 through a shaft rod 72. One end of the shaft rod 72 passes through the outside of the first frame 21 and the second frame 22 and is fixed with a second gear 73. A second tooth plate 74 meshing with the second gear 73 is provided in the passivation tank 1. The second tooth plate 74 is fixed in the passivation tank 1 through a fixing frame 75. When the hydraulic rod 32 controls the connecting frame 33, the supporting frame 34 and the bearing plate 35 to rise, the second gear 73 can contact and mesh with the second tooth plate 74, thereby causing the hollow plate 71 to flip around the shaft rod 72, so that the multiple steel pipes placed on the hollow plate 71 can tilt with the flipping of the hollow plate 71, thereby avoiding the passivation liquid from being retained inside the steel pipe.

[0059] It should be noted that multiple steel pipes can be placed on the hollow plate 71, and the steel pipes are evenly placed on the hollow plate 71. The steel pipes can be fixed to the hollow plate 71 using a restraining belt or a special clamp or chuck, so that when the hollow plate 71 is tilted, the steel pipes will not fall off the hollow plate 71.

[0060] Furthermore, multiple sets of second springs 76 are provided between the two sides of the bottom end of the hollow plate 71 and the bottom ends of the inner walls of the first frame 21 and the second frame 22. When the meshing force of the second gear 73 and the second gear plate 74 that cause the hollow plate 71 to flip is released, the elastic potential energy of the second spring 76 will be released to push the hollow plate 71 back to its initial position. Therefore, by providing multiple sets of second springs 76, after the hollow plate 71 completes the operation of the passivation liquid flowing out of the inner wall of the steel pipe, the hollow plate 71 can be restored to its initial position for the next round of steel pipe loading or other operations.

[0061] A plurality of filtrate ports 77 are provided on both sides of the bottom ends of the inner walls of the first frame 21 and the second frame 22 . The plurality of filtrate ports 77 are used to discharge the excess passivation liquid in the first frame 21 and the second frame 22 .

[0062] If the passivation liquid on the inner wall of the steel pipe cannot be discharged and accumulates therein, on the one hand, it may cause the local passivation film to overgrow due to long-term immersion in excessive passivation liquid, making the structure of the passivation film uneven, such as local thickening and loosening, thereby affecting the overall density and adhesion of the passivation film and reducing its protective effect on the steel pipe substrate. On the other hand, the accumulated passivation liquid may form crystals and other substances on the inner wall of the steel pipe during the drying process, destroying the existing passivation film, which is also not conducive to maintaining the corrosion resistance of the steel pipe. By utilizing the action of the dumping mechanism 7, the first frame 21 and the second frame 22 are controlled to flip during the rising process, so that the steel pipe is tilted to allow the passivation liquid on the inner wall to flow out, which can effectively remove the residual liquid and improve the passivation quality of the steel pipe.

[0063] During use, first, multiple groups of steel pipes to be passivated are sequentially arranged on the hollow plate 71 in the first frame 21 and the second frame 22, and the steel pipes can be fixed on the hollow plate 71 using a restraining belt or a special clamp or a chuck, and then the hydraulic rod 32 is controlled to start, so that the hydraulic rod 32 controls the connecting frame 33, the supporting frame 34, the bearing plate 35, the first frame 21 and the second frame 22 to move downward. When the bearing plate 35 drives the first frame 21 and the second frame 22 to immerse in the passivation liquid contained in the passivation tank 1, the steel pipes begin to passivate. After the steel pipes are passivated for a certain period of time, the hydraulic rod 32 controls the connecting frame 33, the supporting frame 34, the bearing plate 35, the first frame 21 and the second frame 22 to rise again and separate from the passivation liquid.

[0064] At the same time, the motor 55 is controlled to start. With the start of the motor 55, the drive shaft 56 is controlled to rotate. The corresponding drive shaft 53 is rotated clockwise through the transmission of the second transmission member 57. At this time, the two sets of drive shafts 53 on the same carrier plate 35 are rotated clockwise through the transmission of the first transmission member 54. When the two sets of drive shafts 53 rotate, the two sets of rotating shafts 62 on the same carrier plate 35 simultaneously drive the first gear 61 to rotate clockwise through the transmission of the third transmission member 63. With the rotation of the second bevel gear 52, the first bevel gear 51 is controlled to rotate, so that the two sets of reciprocating screw rods 46 rotate in the opposite direction. During the rotation of the rod 46, the sleeve block 47 moves from one end of the reciprocating screw rod 46 to the other end of the reciprocating screw rod 46. While the sleeve block 47 moves, it controls the connection frame 41, the support plate 42, the spline rod 43 and the sliding block 44 to move. The sliding block 44 starts to slide from the initial section of the parallel section 451, so that the first frame 21 and the second frame 22, which were originally in the upper and lower positions, move away from each other. When the sliding block 44 slides from the initial section of the parallel section 451 to the intersection of the parallel section 451 and the inclined section 452, the sliding block 44 controls the spline rod 43 to move within the corresponding spline groove 472 through the guidance of the inclined section 452, and then moves. The first frame 21, which was originally on the top, moves downward, and the second frame 22, which was originally on the bottom, moves upward. When the sliding block 44 slides along the inclined section 452 to the intersection of the inclined section 452 and the vertical section 453, since the spline rod 43 moves along the spline groove 472 at the same time, the first tooth plate 64 can contact and mesh with the first gear 61. At this time, as the first gear 61 rotates, the first tooth plate 64 can be controlled to drive the spline rod 43 to continue to move in the spline groove 472, so that the sliding block 44 continues to slide along the vertical section 453 to the intersection of the vertical section 453 and the straight section 454. The rod 46 continues to rotate, and when the sleeve block 47 moves to the other end of the reciprocating screw rod 46, it moves in the opposite direction. At this time, the sleeve block 47 continues to control the movement of the connecting frame 41, the supporting plate 42, the spline rod 43 and the sliding block 44, so that the sliding block 44 slides along the direction of the straight section 454. At this time, the upper and lower positions of the first frame 21 and the second frame 22 are mutually adjusted. After that, the hydraulic rod 32 is controlled to start, so that the hydraulic rod 32 controls the connecting frame 33, the supporting frame 34, the bearing plate 35, the first frame 21 and the second frame 22 to move downward, so that the upper and lower steel pipes after the position exchange are immersed in the passivation tank 1 again for passivation for a certain period of time;

[0065] When the upper and lower positions of the first frame 21 and the second frame 22 need to be adjusted again, the start motor 55 controls the drive shaft 56 to rotate in the opposite direction. With the cooperation of the drive unit 5, the sliding block 44 can slide along the straight section 454, the vertical section 453, the vertical section 453 and the parallel section 451 to reset.

[0066] At the same time, when the hydraulic rod 32 controls the connecting frame 33, the supporting frame 34 and the carrying plate 35 to rise, the first frame 21 and the second frame 22 can also rise synchronously. At this time, the second gear 73 can contact and engage with the second tooth plate 74, and the hollow plate 71 is flipped around the shaft rod 72, so that the multiple steel pipes placed on the hollow plate 71 can tilt with the flipping of the hollow plate 71, so that the passivation liquid remaining on the inner wall of the steel pipe can flow out.

[0067] It should be noted that the motor 55 in the present invention is a forward and reverse motor, and the motor 55 and the hydraulic rod 32 are electrically connected to the external power supply through wires, and the first transmission member 54, the second transmission member 57 and the third transmission member 63 mentioned in the present invention all include pulleys and conveyor belts, wherein the specific connection method and principle of the pulleys and conveyor belts are prior art.

[0068] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A passivation device for surface treatment of seamless steel pipes, comprising a passivation tank (1), characterized in that: It also includes a bearing assembly (2) arranged above the passivation tank (1) for loading the steel pipe and a lifting assembly (3) for controlling the bearing assembly (2) to be raised or lowered; The bearing assembly (2) comprises a first frame (21) and a second frame (22) which are arranged vertically. The lifting assembly (3) comprises a bracket (31) symmetrically arranged along the length direction of the passivation tank (1), a hydraulic rod (32) arranged above the bracket (31), a connecting frame (33) connected to the output end of the hydraulic rod (32), a supporting frame (34) connected to the connecting frame (33), and a bearing plate (35) integrally arranged with the supporting frame (34), wherein the bearing plate (35) is provided with a switching mechanism (4) for interchanging the positions of the first frame (21) and the second frame (22); The switching mechanism (4) comprises a connection frame (41) fixedly arranged at both ends of the first frame (21) and the second frame (22), a support plate (42) integrally arranged with the connection frame (41), a spline rod (43) fixedly connected to the support plate (42), a sliding block (44) fixed on the spline rod (43), and two groups of guide grooves (45) provided on the surface of each group of bearing plates (35), wherein the sliding block (44) is slidably connected in the corresponding guide grooves (45), wherein the two groups of guide grooves (45) provided on the same bearing plate (35) are arranged diagonally, and each group of guide grooves (45) comprises a parallel section (451), an inclined section (452), a vertical section (453) and a straight section (454); Two groups of reciprocating screw rods (46) are rotatably provided on the surface of each group of the bearing plates (35), and sleeve blocks (47) are provided on the reciprocating screw rods (46). The spline rods (43) are inserted into the corresponding sleeve blocks (47).

2. The passivation device for surface treatment of seamless steel pipe according to claim 1, characterized in that: The bearing plate (35) is also provided with a driving unit (5), the driving unit (5) comprising a first bevel gear (51) fixed on the reciprocating screw (46) and a second bevel gear (52) meshing with the first bevel gear (51), the second bevel gear (52) being rotatably arranged on the bearing plate (35) via a transmission shaft (53), the transmission shaft (53) penetrating to the back side of the bearing plate (35), wherein a first transmission member (54) is arranged between two sets of transmission shafts (53) arranged on the same bearing plate (35); A motor (55) is fixedly mounted on the upper surface of each group of the support frames (34); the output end of the motor (55) is fixedly connected to a drive shaft (56) via a coupling; a second transmission member (57) is provided between the drive shaft (56) and the corresponding transmission shaft (53); when the motor (55) is started, the reciprocating screw (46) is rotated through the transmission cooperation of the drive shaft (56), the second transmission member (57), the transmission shaft (53), the second bevel gear (52) and the first bevel gear (51); and the movement of the connecting frame (41), the support plate (42), the spline rod (43) and the sliding block (44) is controlled at the same time, and then the upper and lower positions of the first frame (21) and the second frame (22) are mutually adjusted through the guidance of the guide groove (45).

3. The passivation device for surface treatment of seamless steel pipe according to claim 2, characterized in that: The bearing plate (35) is also provided with an abutment unit (6), the abutment unit (6) comprising a first gear (61) arranged diagonally on the bearing plate (35), the first gear (61) being rotatably arranged on the bearing plate (35) via a rotating shaft (62), the rotating shaft (62) penetrating to the back side of the bearing plate (35), and a third transmission member (63) being arranged between the rotating shaft (62) and the corresponding transmission shaft (53), and a first tooth plate (64) meshing with the first gear (61) being fixed on the spline rod (43).

4. The passivation device for surface treatment of seamless steel pipe according to claim 1, characterized in that: A dumping mechanism (7) is provided in each of the first frame (21) and the second frame (22), and the dumping mechanism (7) comprises a hollow plate (71) respectively provided in the first frame (21) and the second frame (22) for placing a steel pipe, one end of the hollow plate (71) is rotatably connected to the first frame (21) and the second frame (22) via a shaft (72), one end of the shaft (72) passes through the outside of the first frame (21) and the second frame (22) and is fixed with a second gear (73), a second tooth plate (74) meshing with the second gear (73) is provided in the passivation tank (1), and the second tooth plate (74) is fixed in the passivation tank (1) via a fixing frame (75); A plurality of groups of second springs (76) are provided between the two sides of the bottom end of the hollow plate (71) and the bottom ends of the inner walls of the first frame (21) and the second frame (22).

5. The passivation device for surface treatment of seamless steel pipe according to claim 4, characterized in that: Both sides of the bottom ends of the inner walls of the first frame (21) and the second frame (22) are provided with multiple groups of filtrate openings (77).

6. The passivation device for surface treatment of seamless steel pipe according to claim 3, characterized in that: A protective cover (58) is also provided on the back of the bearing plate (35), and the protective cover (58) is used to shield the transmission shaft (53), the first transmission member (54), the second transmission member (57), the rotating shaft (62) and the third transmission member (63).

7. The passivation device for surface treatment of seamless steel pipe according to claim 1, characterized in that: A protrusion (471) is fixed on the sleeve block (47), and a track groove for the protrusion (471) to slide is provided on the bearing plate (35).

8. The passivation device for surface treatment of seamless steel pipe according to claim 1, characterized in that: The spline rod (43) is provided with a first spring (431), and two ends of the first spring (431) are respectively fixed between the support plate (42) and the sleeve block (47).

9. The passivation device for surface treatment of seamless steel pipe according to claim 1, characterized in that: The sleeve block (47) is provided with a spline groove (472) for the spline rod (43) to pass through in a limited manner.

10. The passivation device for surface treatment of seamless steel pipe according to claim 3, characterized in that: The sleeve block (47) is also provided with a notch (473) for the first tooth plate (64) to pass through.

Images