On-line steel pipe surface passivation device capable of efficiently spraying environment-friendly chromium-free passivation solution

Abstract

The invention belongs to the technical field of steel pipe surface treatment, and particularly relates to an environment-friendly chromium-free passivation solution efficient spraying steel pipe surface online passivation device which comprises a shell, an arc-shaped filter plate, a motor, a stirring assembly, a quantitative feeding assembly, two rotating rings, a spiral pipe, a supporting guide assembly, a transmission assembly and a conveying pump. The arc-shaped filter plate is fixedly installed in the shell and divides the inner space of the shell into an upper part and a lower part, the upper space in the shell is cylindrical, the two rotating rings are rotationally installed on the inner wall of the shell in a sealed mode, and annular grooves are formed in the sides, close to the inner wall of the shell, of the rotating rings. The spiral pipe is fixedly installed on the sides, close to each other, of the two rotating rings and keeps communicating with the two annular grooves. The device is reasonable in design, can realize efficient spraying, automatic monitoring and feeding of the environment-friendly chromium-free passivation solution and effective treatment of impurities, and meanwhile, has good steel pipe specification adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe surface treatment, and in particular to an environmentally friendly, chromium-free passivation liquid, efficient spraying online passivation device for steel pipe surfaces. Background Art

[0002] In the field of steel pipe manufacturing and processing, surface passivation treatment is a key step to improve the corrosion resistance of steel pipes and extend their service life. Traditional steel pipe passivation processes often use chromium-containing passivation solutions. However, chromium, especially hexavalent chromium, is highly toxic and bioaccumulative, causing serious harm to human health, such as respiratory diseases, skin allergies, and even cancer. The production process also generates large amounts of chromium-containing wastewater and waste residue, causing long-term and irreversible pollution to the soil, water, and other ecological environments. This is contrary to the increasingly stringent global environmental regulations and the concept of sustainable development.

[0003] With increasing environmental protection requirements, chromium-free passivation solutions are gradually becoming a new direction for industry development. Although chromium-free passivation solutions solve the environmental pollution problems caused by chromium-containing passivation solutions, they still face many challenges in actual application. On the one hand, traditional spray passivation devices have difficulty achieving efficient and uniform spraying of chromium-free passivation solutions, resulting in uneven thickness of the passivation film on the surface of steel pipes, affecting the passivation effect and the corrosion resistance of the steel pipes. On the other hand, during the use of the passivation solution, due to the lack of effective monitoring and automatic feeding mechanisms, the consumed active ingredients cannot be replenished in time, resulting in unstable passivation solution concentration and reducing the quality and efficiency of the passivation treatment.

[0004] In addition, impurities such as metal debris are inevitably produced during the production process of steel pipes. Once these impurities are mixed into the passivation liquid, they will affect the chemical properties of the passivation liquid, reduce its activity, and may even cause quality defects such as spots and roughness on the surface of the steel pipe. At the same time, the existing steel pipe surface passivation device has poor adaptability to steel pipes of different specifications. When processing steel pipes of different outer diameters and lengths, it is often necessary to frequently adjust equipment parameters or replace parts, which seriously restricts production efficiency and increases production costs.

[0005] Therefore, developing an online passivation device that can realize efficient spraying of environmentally friendly chromium-free passivation liquid, automatic monitoring and feeding, effective treatment of impurities, and good adaptability to steel pipe specifications has become an urgent need to solve the current technical bottleneck of steel pipe surface passivation treatment and promote the green and efficient development of the steel pipe manufacturing industry. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an environmentally friendly online passivation device for steel pipe surface with efficient spraying of chromium-free passivation liquid.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: an environmentally friendly chromium-free passivation liquid high-efficiency spraying online passivation device for steel pipe surface, comprising a housing, an arc-shaped filter plate, a motor, an agitation assembly, a quantitative feeding assembly, two rotating rings, a spiral tube, a support guide assembly, a transmission assembly and a delivery pump;

[0008] The arc-shaped filter plate is fixedly mounted in the shell and divides the internal space of the shell into two parts, an upper part and an lower part, and the upper space in the shell is cylindrical. The two rotating rings are both sealed and rotatably mounted on the inner wall of the shell, and an annular groove is provided on the side of the rotating ring close to the inner wall of the shell. The spiral tube is fixedly mounted on the side of the two rotating rings close to each other and maintained in a connected state with the two annular grooves, and a plurality of nozzles are fixedly mounted on the spiral tube toward the axis of the rotating ring. The stirring assembly is arranged in the shell and located below the arc-shaped filter plate. The motor is fixedly mounted on the shell, and the output shaft of the motor is connected to the stirring assembly. The quantitative feeding assembly is arranged on one side of the shell and connected to the stirring assembly.

[0009] Rectangular openings are provided on both sides of the shell, and the support and guide components are arranged in the two rectangular openings;

[0010] The transmission assembly is arranged on the housing and is connected to the stirring assembly and the two rotating rings;

[0011] Two support plates are fixedly mounted on the housing, the delivery pump is fixedly mounted on the left support plate, and the water inlet and outlet of the delivery pump are respectively connected to the housing and the annular groove on the left;

[0012] A plurality of sensor modules for monitoring effective components of the chromium-free passivation solution in the shell are detachably mounted on the front side of the shell below the arc-shaped filter plate.

[0013] Preferably, the support guide assembly includes multiple guide wheels, four rotating shafts, four guide blocks and four guide grooves. Two guide grooves are provided in each of the two rectangular openings. Guide blocks are slidably installed in the four guide grooves. Four rotating shafts arranged parallel to each other are rotatably installed on the front and rear inner walls of the four guide blocks and the two rectangular openings. Multiple guide wheels are fixedly sleeved on the four rotating shafts.

[0014] Preferably, the support guide assembly further includes four springs, and springs are fixedly mounted on the top sides of the four guide blocks, and the top ends of the four springs are respectively fixedly connected to the top inner walls of the corresponding guide grooves.

[0015] Preferably, the stirring assembly includes a hollow shaft and spiral blades. The same hollow shaft is rotatably mounted on the inner walls of both sides of the shell, and the spiral blades are fixedly mounted on the hollow shaft. The hollow shaft is fixedly connected to the output shaft of the motor. There are two spiral blades and they are symmetrically arranged.

[0016] Preferably, the transmission assembly includes two gear 1s, two toothed discs 1, two toothed discs 2, two toothed discs 3, two rotating pins, two support blocks, two gear 2s and two gear 3s. Two support blocks are fixedly installed on the top of the inner wall of the shell. Rotating pins are rotatably installed on the two support blocks. Gear 2 and gear 3 are fixedly sleeved on the two rotating pins. Two toothed discs 1 are rotatably installed on the shell. Toothed discs 2 are fixedly installed on the inner side walls of the two toothed discs 1. The two toothed discs 2 are respectively meshed with the corresponding gear 2. Toothed discs 3 are fixedly installed on the sides of the two rotating rings away from each other. The two toothed discs 3 are respectively meshed with the corresponding gear 3. Two gear 1s are fixedly sleeved on the hollow shaft. The two gear 1s are respectively meshed with the corresponding toothed disc 1.

[0017] Preferably, the quantitative feeding assembly includes a liquid storage tank, a delivery pipe and a control valve. The liquid storage tank is fixedly installed on one side of the shell, and the delivery pipe is fixedly installed on the bottom of the liquid storage tank. The delivery pipe is sealed and rotatably connected to one end of the hollow shaft. The control valve is arranged on the delivery pipe, and multiple through holes are opened on the hollow shaft.

[0018] Preferably, the sensor in the sensor module is a potential-type ion sensor.

[0019] Preferably, the cross section of the spiral tube is rectangular, and the outer side of the spiral tube is in contact with the inner wall of the shell and the arc-shaped filter plate.

[0020] Preferably, a discharge port is reserved between the right side of the arc-shaped filter plate and the inner wall of the shell.

[0021] Preferably, the bottom of the inner wall of the shell is set to be high on both sides and low in the middle, and a discharge pipe with a valve is fixedly installed at the bottom of the shell, and the top of the discharge pipe is located at the lowest point of the bottom inner wall of the shell.

[0022] The beneficial effects of the present invention are:

[0023] Efficient spraying and uniform passivation: The design of spiral tubes and multiple nozzles enables efficient spraying of the steel pipe surface in all directions and at multiple angles, so that the chromium-free passivation liquid is evenly covered on the steel pipe surface, thereby significantly improving the passivation effect and ensuring the formation of a uniform and dense passivation film on the steel pipe surface, effectively enhancing the corrosion resistance of the steel pipe. At the same time, the spiral tube has a rectangular cross-section and contacts the inner wall of the shell and the curved filter plate. During the rotation process, the inner wall of the shell and the curved filter plate can be cleaned to avoid impurities adhering to the spraying effect, further ensuring the uniformity and stability of the passivation.

[0024] Automatic detection and precise feeding: Multiple potential-type ion sensors detachably mounted on the shell can monitor the concentration of active ingredients in the chromium-free passivation solution in real time and accurately. When insufficient active ingredients are detected, the quantitative feeding component automatically starts to accurately add passivation solution into the shell through the liquid storage tank, delivery pipe and through-holes on the hollow shaft, ensuring that the passivation solution always maintains an appropriate concentration, maintaining a stable and good passivation effect, reducing the tedious operations of manual detection and feeding, and improving the level of production automation.

[0025] Impurity treatment and solution purification: The symmetrical setting of the spiral blades in the stirring assembly can transport the debris settled at the bottom of the shell to the middle. Combined with the design of high sides and low middle of the bottom of the inner wall, the debris is concentrated at the discharge pipe, which is convenient for discharge through valve control, effectively preventing impurities from affecting the performance of the passivation liquid. The discharge port reserved between the curved filter plate and the inner wall of the shell, combined with the cleaning function of the curved filter plate by the rotation of the spiral tube, can promptly remove impurities intercepted on the filter plate, ensure the purity of the passivation liquid, extend the service life of the passivation liquid, and reduce production costs.

[0026] Adaptable to steel pipes of different specifications: The combined design of the guide wheel, guide block and spring in the support and guide assembly can provide stable transportation and guidance for the steel pipes entering and exiting the shell. The downward pressure applied by the spring can make the guide wheel adaptively adjust to fit the steel pipes of different outer diameters tightly, ensuring that the steel pipes pass smoothly in the device without frequent equipment replacement or parameter adjustment, significantly improving the applicability of the device to steel pipes of various specifications and expanding the scope of application.

[0027] Structural linkage and energy-saving and high efficiency: The transmission assembly realizes efficient transmission and distribution of motor power through the mutual engagement of gears, toothed discs and rotating pins, so that the stirring assembly and rotating ring can operate in coordination. This ingenious structural design reduces additional power loss and energy consumption while ensuring the normal operation of each component, improves the operating efficiency of the device and achieves the production goal of energy saving and efficiency improvement.

[0028] Environmental protection and sustainability: The use of chromium-free passivation liquid meets environmental protection requirements and reduces the harm of heavy metal chromium to the environment and human health. At the same time, through precise control of the effective ingredients of the passivation liquid and timely treatment of impurities, the service life of the passivation liquid is extended, waste liquid discharge is reduced, and pollution to the environment is reduced. It is in line with the concept of green production and sustainable development, and helps companies improve their environmental image and competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of an environmentally friendly, chromium-free passivation liquid-efficiently sprayed online passivation device for steel pipe surfaces proposed by the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure from another perspective;

[0032] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure;

[0033] Figure 4 for Figure 2 Schematic diagram of the structure of the main viewing angle;

[0034] Figure 5 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0035] Figure 6 This is a schematic structural diagram of the housing, delivery pump, support plate, and rectangular opening portion proposed in the present invention;

[0036] Figure 7 This is a schematic structural diagram of the rotating shaft, guide block and guide wheel parts proposed in the present invention;

[0037] Figure 8 This is a schematic diagram of the three-dimensional structure of the gear disc 1, gear disc 2, gear disc 3, gear 2, gear 3, support block and rotating pin part proposed in the present invention.

[0038] In the figure: 1. Housing; 101. Arc filter plate; 11. Guide wheel; 111. Guide block; 112. Spring; 12. Discharge pipe; 13. Sensor module; 2. Rotating ring; 21. Spiral tube; 22. Delivery pump; 3. Spiral blade; 301. Motor; 31. Hollow shaft; 32. Liquid storage tank; 33. Delivery pipe; 331. Control valve; 4. Gear 1; 41. Sprocket 1; 42. Sprocket 2; 43. Rotating pin; 431. Support block; 44. Gear 2; 45. Gear 3; 46. Sprocket 3. DETAILED DESCRIPTION

[0039] The technical solutions of the present invention will be described clearly and completely below with reference to specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0040] Reference Figure 1-8, an environmentally friendly chromium-free passivation liquid high-efficiency spraying steel pipe surface online passivation device, including a shell 1, an arc filter plate 101, a motor 301, two rotating rings 2, a spiral tube 21 and a delivery pump 22, the arc filter plate 101 is fixedly installed in the shell 1 and divides the internal space of the shell 1 into two parts, and the upper space in the shell 1 is cylindrical. The two rotating rings 2 are both sealed and rotatably installed on the inner wall of the shell 1, and an annular groove is opened on the side of the rotating ring 2 close to the inner wall of the shell 1. The spiral tube 21 is fixedly installed on the side of the two rotating rings 2 close to each other and keeps the two annular grooves. The shell 1 is in a connected state, and the spiral tube 21 is fixedly installed with multiple nozzles in the direction of the axis of the rotating ring 2. The same hollow shaft 31 is rotatably installed on the inner walls of both sides of the shell 1. The spiral blades 3 are fixedly installed on the hollow shaft 31. The number of spiral blades 3 is two and they are symmetrically arranged. When the hollow shaft 31 rotates, the debris deposited on the bottom inner wall of the shell 1 can be transported, and the debris on both sides of the bottom inner wall of the shell 1 can be transported to the middle position of the bottom inner wall of the shell 1. The motor 301 is fixedly installed on the shell 1, and the output shaft of the motor 301 is fixedly connected to the hollow shaft 31;

[0041] A liquid storage tank 32 is fixedly mounted on one side of the housing 1, and a delivery pipe 33 is fixedly mounted on the bottom of the liquid storage tank 32. The delivery pipe 33 is rotatably connected to one end of the hollow shaft 31 in a sealed manner. A control valve 331 is provided on the delivery pipe 33, and a plurality of through holes are provided on the hollow shaft 31. When the sensor module 13 detects that the effective components of the passivation liquid in the housing 1 are insufficient, the passivation liquid can be added to the housing 1, thereby ensuring the passivation effect.

[0042] Rectangular openings are provided on both sides of the shell 1, and two guide grooves are provided in the two rectangular openings. Guide blocks 111 are slidably installed in the four guide grooves. Four rotating shafts arranged parallel to each other are rotatably installed on the four guide blocks 111 and the inner walls on the front and rear sides of the two rectangular openings. A plurality of guide wheels 11 are fixedly sleeved on the four rotating shafts, which can convey and guide the steel pipes entering and leaving the shell 1. Springs 112 are fixedly installed on the top sides of the four guide blocks 111. The top ends of the four springs 112 are fixedly connected to the inner walls of the top sides of the corresponding guide grooves, respectively, and can apply a downward force to the upper guide wheel 11, thereby being able to well adapt to the guiding and conveying operations of steel pipes of different sizes.

[0043] Two support blocks 431 are fixedly installed on the top of the inner wall of the shell 1, and a rotating pin 43 is rotatably installed on each of the two support blocks 431. Gear 2 44 and gear 3 45 are fixedly sleeved on each of the two rotating pins 43. Two toothed discs 1 41 are rotatably installed on the shell 1. Toothed discs 2 42 are fixedly installed on the inner side walls of the two toothed discs 1 41. The two toothed discs 2 42 are respectively meshed with the corresponding gear 2 44. Toothed discs 3 46 are fixedly installed on the sides of the two rotating rings 2 away from each other. The two toothed discs 3 46 are respectively meshed with the corresponding gear 3 45. Two gears 1 4 are fixedly sleeved on the hollow shaft 31. The two gears 1 4 are respectively meshed with the corresponding toothed discs 1 41, which can provide drive for the two rotating rings 2 when the hollow shaft 31 rotates;

[0044] Two support plates are fixedly mounted on the housing 1, and the delivery pump 22 is fixedly mounted on the support plate on the left side, and the water inlet and outlet of the delivery pump 22 are respectively connected to the housing 1 and the annular groove on the left side;

[0045] On the front side of the shell 1, a plurality of sensor modules 13 for monitoring the effective components of the chromium-free passivation solution in the shell 1 are detachably installed at a position below the arc filter plate 101. Among them, the sensor in the sensor module 13 adopts a potential-type ion sensor, which can selectively respond to specific ions based on the ion-selective electrode. When the electrode contacts the chromium-free passivation solution, it will generate a corresponding potential difference according to the concentration of the target ion in the solution. The potential difference is converted into ion concentration through the Nernst equation, thereby realizing the detection of the effective components.

[0046] In this embodiment, in order to achieve the effect of cleaning the inner wall of the shell 1 and the curved filter plate 101, the cross-section of the spiral tube 21 is set to be rectangular, and the outer side of the spiral tube 21 is in contact with the inner wall of the shell 1 and the curved filter plate 101.

[0047] In this embodiment, in order to clean the arc filter plate 101 as the spiral tube 21 rotates and push the cleaned debris to the right to the discharge port position, so that it can move downward from the right side of the arc filter plate 101, a discharge port is reserved between the right side of the arc filter plate 101 and the inner wall of the shell 1.

[0048] In this embodiment, in order to facilitate the discharge of debris settled on the bottom inner wall of the shell 1, the bottom of the inner wall of the shell 1 is set in a state where the two sides are high and the middle is low. A discharge pipe 12 with a valve is fixedly installed at the bottom of the shell 1, and the top of the discharge pipe 12 is located at the lowest point of the bottom inner wall of the shell 1.

[0049] In this embodiment, in order to further prevent the delivery pump 22 from sucking in debris when extracting the passivation liquid from below the arc-shaped filter plate 101 in the housing 1, a filter screen with a filtering function (not shown in the figure) should be set at the water inlet position of the delivery pump 22.

[0050] Working principle:

[0051] Steel pipe transportation and guidance

[0052] Steel pipes enter and exit the device through rectangular openings on either side of the housing 1. Guide wheels 11 within these openings provide both conveyance and guidance for the pipes. Guide blocks 111 slide within guide grooves, while springs 112 apply downward force to the upper guide wheels 11, enabling them to adapt to pipes of varying sizes and ensuring smooth passage through the device, preparing for subsequent passivation treatment.

[0053] Passivation liquid spray

[0054] After the delivery pump 22 is activated, it draws chromium-free passivation liquid from the space below the curved filter plate 101 in the housing 1. A filter screen is installed at the water inlet of the delivery pump 22 to prevent the ingestion of debris. The drawn passivation liquid enters the annular groove of the left rotating ring 2 through the outlet of the delivery pump 22, and then flows through the annular groove into the spiral tube 21. Multiple nozzles mounted on the spiral tube 21, facing the axis of the rotating ring 2, evenly spray the passivation liquid onto the surface of the steel pipe passing through the device, forming a passivation film on the steel pipe, thus achieving passivation treatment.

[0055] The internal components of the device are linked to the rotation of the spiral tube 21

[0056] After the motor 301 is started, its output shaft drives the hollow shaft 31 to rotate. The spiral blades 3 on the hollow shaft 31 rotate accordingly, transporting debris deposited on both sides of the bottom inner wall of the housing 1 toward the middle. At the same time, the two gears 1 (4) fixedly mounted on the hollow shaft 31 also rotate. Gear 1 (4) meshes with toothed disc 1 (41), driving toothed disc 1 (41) to rotate. Toothed disc 2 (42) on the inner wall of toothed disc 1 (41) meshes with gear 2 (44), which in turn drives the rotating pin 43 to rotate. Gear 3 (45) fixedly mounted on the rotating pin 43 meshes with toothed disc 3 (46) on the rotating ring 2, ultimately achieving rotation of the two rotating rings 2, thereby driving the spiral tube 21 to rotate.

[0057] Monitoring and replenishment of active ingredients in passivation solution

[0058] A potentiometric ion sensor in sensor module 13, located on the front side of housing 1 below curved filter plate 101, monitors the active ingredients of the chromium-free passivation solution within housing 1 in real time. When the concentration of the target ion in the solution changes, a corresponding potential difference is generated across the electrodes, which is converted into ion concentration using the Nernst equation. If insufficient active ingredients in the passivation solution are detected, control valve 331 opens, allowing the passivation solution in reservoir 32 to flow through delivery pipe 33 into hollow shaft 31 and then into housing 1 through multiple through-holes in hollow shaft 31, replenishing the active ingredients and ensuring the passivation effect.

[0059] Cleaning the inside of the device and removing debris

[0060] The spiral tube 21 has a rectangular cross-section, and its outer side contacts the inner wall of the housing 1 and the curved filter plate 101. As the spiral tube 21 rotates, it cleans the inner wall of the housing 1 and the curved filter plate 101. A discharge port, reserved between the right side of the curved filter plate 101 and the inner wall of the housing 1, allows cleaned debris to be pushed rightward to the discharge port as the spiral tube 21 rotates. Then, it moves downward from the right side of the curved filter plate 101. Debris that has settled on the bottom inner wall of the housing 1 is concentrated toward the center by the action of the spiral blades 3. Because the bottom inner wall of the housing 1 is higher on both sides and lower in the middle, the debris ultimately converges at the lowest point, the discharge pipe 12. Opening the valve on the discharge pipe 12 allows the debris to be discharged from the device.

[0061] The above is a detailed introduction to the environmentally friendly, chromium-free, passivation liquid-efficient online passivation device for steel pipe surfaces provided by the present invention. Specific embodiments are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications may be made to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An environmentally friendly, chromium-free passivation liquid, efficient spraying, online passivation device for steel pipe surface, characterized in that: It comprises a housing (1), an arc-shaped filter plate (101), a motor (301), a stirring assembly, a quantitative feeding assembly, two rotating rings (2), a spiral tube (21), a supporting guide assembly, a transmission assembly and a delivery pump (22); The arc filter plate (101) is fixedly mounted in the shell (1) and divides the internal space of the shell (1) into two parts, an upper part and an lower part, and the upper space in the shell (1) is cylindrical. The two rotating rings (2) are both sealed and rotatably mounted on the inner wall of the shell (1), and an annular groove is provided on the side of the rotating ring (2) close to the inner wall of the shell (1). The spiral tube (21) is fixedly mounted on the side of the two rotating rings (2) close to each other and maintains a state of communication with the two annular grooves, and a plurality of nozzles are fixedly mounted on the spiral tube (21) in the direction of the axis of the rotating ring (2). The stirring assembly is arranged in the shell (1) and is located below the arc filter plate (101). The motor (301) is fixedly mounted on the shell (1), and the output shaft of the motor (301) is connected to the stirring assembly. The quantitative feeding assembly is arranged on one side of the shell (1) and is connected to the stirring assembly. Rectangular openings are provided on both sides of the housing (1), and the support and guide components are arranged in the two rectangular openings; The transmission assembly is arranged on the housing (1) and is connected to the stirring assembly and the two rotating rings (2); Two support plates are fixedly mounted on the housing (1), the delivery pump (22) is fixedly mounted on the support plate on the left side, and the water inlet and outlet of the delivery pump (22) are respectively connected to the housing (1) and the annular groove on the left side; A plurality of sensor modules (13) for monitoring effective components of the chromium-free passivation solution in the housing (1) are detachably mounted at a position below the arc-shaped filter plate (101) on the front side of the housing (1).

2. The environmentally friendly online passivation device for steel pipe surface with high-efficiency spraying of chromium-free passivation liquid according to claim 1 is characterized by: The support guide assembly comprises a plurality of guide wheels (11), four rotating shafts, four guide blocks (111) and four guide grooves, two guide grooves are provided in each of the two rectangular openings, guide blocks (111) are slidably installed in each of the four guide grooves, four rotating shafts arranged parallel to each other are rotatably installed on the front and rear inner walls of the four guide blocks (111) and the two rectangular openings, and a plurality of guide wheels (11) are fixedly sleeved on each of the four rotating shafts.

3. The environmentally friendly online passivation device for steel pipe surface with high-efficiency spraying of chromium-free passivation liquid according to claim 2, characterized in that: The support guide assembly further comprises four springs (112), the top sides of the four guide blocks (111) are all fixedly mounted with springs (112), and the top ends of the four springs (112) are respectively fixedly connected to the top inner walls of the corresponding guide grooves.

4. The environmentally friendly online passivation device for steel pipe surface with high-efficiency spraying of chromium-free passivation liquid according to claim 1 is characterized by: The stirring assembly comprises a hollow shaft (31) and spiral blades (3); the same hollow shaft (31) is rotatably mounted on the inner walls of both sides of the housing (1); the spiral blades (3) are fixedly mounted on the hollow shaft (31); the hollow shaft (31) is fixedly connected to the output shaft of the motor (301); and the number of the spiral blades (3) is two and they are symmetrically arranged.

5. The environmentally friendly online passivation device for steel pipe surface with high-efficiency spraying of chromium-free passivation liquid according to claim 4, characterized in that: The transmission assembly comprises two gears 1 (4), two toothed discs 1 (41), two toothed discs 2 (42), two toothed discs 3 (46), two rotating pins (43), two support blocks (431), two gears 2 (44) and two gears 3 (45). Two support blocks (431) are fixedly mounted on the top of the inner wall of the housing (1). Rotating pins (43) are rotatably mounted on the two support blocks (431). Gears 2 (44) and gears 3 (45) are fixedly sleeved on the two rotating pins (43). The housing ( 1) are rotatably mounted on two toothed discs (41), and toothed discs (42) are fixedly mounted on the inner side walls of the two toothed discs (41), and the two toothed discs (42) are respectively engaged with corresponding gears (44). Two rotating rings (2) are fixedly mounted on the sides away from each other, and the two toothed discs (46) are respectively engaged with corresponding gears (45). Two gears (4) are fixedly sleeved on the hollow shaft (31), and the two gears (4) are respectively engaged with corresponding toothed discs (41).

6. The environmentally friendly online passivation device for steel pipe surface with high-efficiency spraying of chromium-free passivation liquid according to claim 4, characterized in that: The quantitative feeding assembly comprises a liquid storage tank (32), a delivery pipe (33) and a control valve (331); the liquid storage tank (32) is fixedly mounted on one side of the housing (1); the delivery pipe (33) is fixedly mounted on the bottom of the liquid storage tank (32); the delivery pipe (33) is sealingly rotatably connected to one end of the hollow shaft (31); the control valve (331) is arranged on the delivery pipe (33); and a plurality of through holes are opened on the hollow shaft (31).

7. The environmentally friendly online passivation device for steel pipe surface with high-efficiency spraying of chromium-free passivation liquid according to claim 1 is characterized by: The sensor in the sensor module (13) is a potential-type ion sensor.

8. The environmentally friendly online passivation device for steel pipe surface with high-efficiency spraying of chromium-free passivation liquid according to claim 1 is characterized by: The cross section of the spiral tube (21) is rectangular, and the outer side of the spiral tube (21) is in contact with the inner wall of the shell (1) and the arc-shaped filter plate (101).

9. The environmentally friendly online passivation device for steel pipe surface with high-efficiency spraying of chromium-free passivation liquid according to claim 1, characterized in that: A discharge port is reserved between the right side of the arc-shaped filter plate (101) and the inner wall of the shell (1).

10. The environmentally friendly online passivation device for steel pipe surface with high-efficiency spraying of chromium-free passivation liquid according to claim 1, characterized in that: The bottom of the inner wall of the shell (1) is arranged in a state where the two sides are higher and the middle is lower. A discharge pipe (12) provided with a valve is fixedly mounted on the bottom of the shell (1), and the top end of the discharge pipe (12) is located at the lowest point of the bottom inner wall of the shell (1).

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