Passivation and cleaning all-in-one machine for inner surface of small-caliber stainless steel long pipe and passivation and

Abstract

The invention discloses an all-in-one machine for passivating and cleaning the inner surface of a small-caliber stainless steel long pipe and a passivating and cleaning method, and the all-in-one machine comprises a passivating box in which the small-caliber stainless steel long pipe to be passivated is arranged; the passivation solution circulating supply mechanism comprises a passivation solution preparing and supplying part and a passivation solution circulating conveying part, and the passivation solution preparing and supplying part is configured to prepare passivation solution with set concentration and convey the prepared passivation solution into the circulating conveying part; the passivation solution circulating conveying part is used for circularly supplying passivation solution into the small-caliber stainless steel long pipe in the passivation box or pumping out the passivation solution; the cleaning liquid circulating supply mechanism is used for circularly supplying cleaning liquid into the small-caliber stainless steel long pipe in the passivation box or pumping out the cleaning liquid; and / or a control mechanism. The method has the beneficial effects that a passivation formula can be selected according to the material performance of the steel pipe, passivation and cleaning are integrated, operation is easy, the passivation effect is good, and the method is suitable for passivation and cleaning of the inner surface of the small-caliber stainless steel long pipe produced industrially.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel passivation, and particularly relates to an integrated machine for passivation cleaning of the inner surface of a small-caliber stainless steel long tube and a passivation cleaning method. Background Art

[0002] Stainless steel is an excellent corrosion-resistant material. However, during the processing and forming process, the crystal structure of stainless steel is prone to change and structural damage, causing pitting, stress corrosion, intergranular corrosion, etc., making its corrosion resistance unable to meet the functional requirements of the product. Passivation is a state in which metals and alloys lose their activity under special conditions. This process can further improve the corrosion resistance of the material and is an important method for post-processing of stainless steel parts. The commonly used passivation solution is nitric acid solution, which is volatile and causes harm to the environment and personnel. If the surface is not cleaned in time, the residual acid solution is easy to corrode the stainless steel pipe. In addition, the inner surface passivation of small-diameter stainless steel long tubes using immersion method results in solution waste, uneven passivation and the like. The nitric acid passivation solution suitable for stainless steel passivation is a universal passivation solution. It can be prepared into nitric acid passivation solutions of different proportions and concentrations according to the type and material of the stainless steel to be passivated. After the stainless steel pipe is passivated by the above-mentioned traditional method, the stainless steel pipe needs to be transported and transferred to the cleaning equipment for cleaning many times, which makes the whole process complicated and inefficient. The number of transports is large, and the bending phenomenon of small-diameter stainless steel long tubes cannot be avoided. Moreover, most of the current passivation equipment immerses the stainless steel pipe in the passivation and lifts and reciprocates to accelerate the surface passivation efficiency of the stainless steel pipe. It is not only not suitable for the passivation of long tubes and small-diameter tubes, but also most of the current passivation equipment is in an open state. The open immersion passivation method is poor in temperature control, environmental protection and economy.

[0003] Therefore, it is urgent to design a passivation-cleaning device suitable for the inner surface of small-diameter stainless steel long tubes, which can select different passivation solutions and passivation processes according to steel pipes of different materials, greatly save the amount of passivation solution, and can simultaneously passivate-clean the inner surface of small-diameter stainless steel long tubes efficiently and with high quality. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art, the present invention provides a small-diameter stainless steel long tube inner surface passivation cleaning all-in-one machine and passivation cleaning method, which can select the passivation formula according to the material properties of the steel pipe, integrates passivation and cleaning, is simple to operate, has good passivation effect, and is suitable for industrial production.

[0005] The present invention is achieved through the following technical measures: The small-caliber stainless steel long tube inner surface passivation cleaning integrated machine of the present invention is characterized by comprising: A passivation box, wherein the passivation box has a small-caliber stainless steel long tube to be passivated; The passivation liquid circulation supply mechanism comprises a passivation liquid configuration supply part and a passivation liquid circulation conveying part, wherein the passivation liquid configuration supply part is configured to configure a passivation liquid of a set concentration and deliver the configured passivation liquid to the circulation conveying part, and the liquid inlet and the liquid outlet of the passivation liquid circulation conveying part are respectively connected to the two ends of the small-diameter stainless steel long tube in the passivation box to form a circulating passivation liquid supply passage, which is used to circulate the passivation liquid to the small-diameter stainless steel long tube in the passivation box, or to drain the passivation liquid; A cleaning liquid circulation supply mechanism, the cleaning liquid circulation supply mechanism is respectively connected to both ends of the small-diameter stainless steel long tube in the passivation box to form a circulating cleaning liquid supply passage, which is used to circulate the cleaning liquid to the small-diameter stainless steel long tube in the passivation box, or to drain the cleaning liquid; and / or The control mechanism includes a temperature control system and a central controller. The temperature control system is configured to control the temperature of the passivation liquid in the passivation liquid circulation supply mechanism; the central controller is electrically connected to the passivation liquid circulation supply mechanism, the cleaning liquid circulation supply mechanism, and the temperature control system.

[0006] As a preferred embodiment of the present invention, the small-diameter stainless steel long tube inner surface passivation cleaning integrated machine described in the present invention also includes a pH detection mechanism, which is arranged on the passivation liquid circulation supply mechanism and the cleaning liquid circulation supply mechanism, and is used to detect the pH value of the passivation liquid and the cleaning liquid.

[0007] As a preferred embodiment of the present invention, the passivation box includes a rectangular box body and a box door arranged on the box body, the box wall of the box body is provided with an end docking connecting structure for fixing and connecting the inner cavity of the small-diameter stainless steel long tube, and the interior of the box body is provided with a long tube support structure for supporting the small-diameter stainless steel long tube.

[0008] As a preferred embodiment of the present invention, the end butt-jointed connecting structure includes a main connecting pipe and a plurality of butt joints connected to the main connecting pipe, the plurality of butt joints are passed through the wall of the passivation box, the ends of the butt joints located outside the passivation box are connected to the main connecting pipe, and the ends of the butt joints located inside the passivation box are plugged into and matched with one end of the small-diameter stainless steel long tube.

[0009] As a preferred embodiment of the present invention, a rack for fixing small-diameter stainless steel long tubes is provided on the top of the long tube support structure, and the rack includes a plurality of long tube fixings arranged along the length direction of the box body, and the heights of the plurality of long tube fixings gradually increase or decrease in the length direction of the box body, so as to realize the inclined arrangement of the small-diameter stainless steel long tubes.

[0010] As a preferred embodiment of the present invention, the passivation liquid is configured to supply a part including a stock liquid tank, a water storage tank and a peristaltic pump, the stock liquid tank stores the passivation liquid stock, and the water storage tank stores water for diluting the passivation liquid stock; the stock liquid tank, the water storage tank and the inlet pipeline of the peristaltic pump are connected, and the outlet of the peristaltic pump is connected to the feeding port pipeline of the passivation liquid circulation and conveying part.

[0011] As a preferred embodiment of the present invention, the passivation liquid circulation and transportation part includes a passivation liquid storage tank, a liquid inlet pipe, an infusion pump and a liquid outlet pipe connected in sequence, and the ends of each of the small-diameter stainless steel long tubes are butt-connected to a connecting structure and a first reflux pipe. One end of each of the small-diameter stainless steel long tubes is connected to the liquid outlet pipe through the end butt-connected connecting structure, and the other end of each of the small-diameter stainless steel long tubes is connected to the passivation liquid storage tank through the first reflux pipe.

[0012] As a preferred embodiment of the present invention, the passivation liquid storage tank is provided with a stirring device for stirring the liquid in the passivation liquid storage tank.

[0013] As a preferred embodiment of the present invention, the temperature control system includes a temperature sensor and an electric heating component which are arranged on the passivation liquid storage tank and electrically connected to the control mechanism. The electric heating component is arranged in the passivation liquid storage tank, and the probe of the temperature sensor extends into the passivation liquid storage tank. Since the passivation liquid releases heat during the configuration process, the released heat can assist the temperature control system to heat the passivation liquid. If the temperature sensor detects that the temperature of the passivation liquid has not reached the expected temperature, the electric heating component will work and continue to heat the passivation liquid in the passivation liquid storage tank. If the temperature sensor detects that the temperature of the passivation liquid exceeds the expected temperature, the electric heating component will stop working, so that the passivation liquid in the passivation liquid storage tank can be maintained at the set temperature.

[0014] As a preferred embodiment of the present invention, the electric heating component is a PTFE material heating rod, which can keep the passivation liquid in the passivation liquid storage tank at the required temperature for a long time.

[0015] As a preferred embodiment of the present invention, the temperature control system also includes a cooling circulation mechanism for cooling the passivation liquid in the passivation box. If the temperature sensor detects that the temperature of the passivation liquid exceeds the expected temperature by a large amount, the cooling circulation mechanism will work, and coolant will be introduced into the cooling coil, thereby cooling the passivation liquid in the passivation liquid storage tank. The temperature control system can maintain the passivation liquid in the passivation liquid storage tank at a set temperature. Usually, when the temperature of the passivation liquid exceeds the expected temperature by a small amount (such as within 3°C), there is no need to start the cooling circulation mechanism. If the temperature of the passivation liquid exceeds the expected temperature by a large amount (such as above 3°C), the cooling circulation mechanism can be started while the electric heating component is stopped, thereby achieving the effect of regulating the temperature of the passivation liquid.

[0016] As a preferred embodiment of the present invention, the cleaning liquid circulation supply mechanism includes a cleaning liquid storage tank, a water inlet pipe, a cleaning pump and a water outlet pipe connected in sequence, and both ends of each of the small-diameter stainless steel long tubes are connected to an end-butt connecting structure and a second return pipe. One end of each of the small-diameter stainless steel long tubes is connected to the water outlet pipe through the end-butt connecting structure, and the other end of each of the small-diameter stainless steel long tubes is connected to the cleaning liquid storage tank through the second return pipe.

[0017] As a preferred embodiment of the present invention, the control mechanism also includes a regulating valve group, and each control valve of the regulating valve group is arranged on the pipeline of the passivation liquid configuration supply part, the passivation liquid circulation supply mechanism, and the cleaning liquid circulation supply mechanism, and is electrically connected to the central controller for controlling the on and off states of the passivation liquid circulation supply mechanism, the cleaning liquid circulation supply mechanism, and the temperature control system.

[0018] As a preferred embodiment of the present invention, the regulating valve group includes a liquid supply valve for controlling the on-off of the corresponding pipeline of the passivation liquid configuration supply part, an acid inlet valve and an acid discharge valve for controlling the on-off of the corresponding pipeline of the passivation liquid circulation and delivery part, and a water inlet valve and a water discharge valve for controlling the on-off of the corresponding pipeline of the cleaning liquid circulation supply mechanism, and the liquid supply valve is arranged on the pipeline between the liquid storage tank and the peristaltic pump; the acid inlet valve is arranged at the liquid outlet of the passivation liquid storage tank and is connected to the liquid inlet pipe; the acid discharge valve is arranged at the acid discharge port of the passivation liquid storage tank and is connected to the liquid outlet pipe; the water inlet valve is arranged at the water outlet of the cleaning liquid storage tank and is connected to the cleaning liquid storage tank pipeline; the drain valve is arranged at the water inlet of the cleaning liquid storage tank and is connected to the docking connecting structure.

[0019] As a preferred embodiment of the present invention, the small-diameter stainless steel long tube inner surface passivation and cleaning integrated machine described in the present invention also includes an early warning mechanism, which is arranged on the passivation box, and the early warning mechanism is connected to the central controller of the control mechanism, and is used to issue an early warning message when the pH value of the passivation liquid and / or the cleaning liquid exceeds a preset threshold value, reminding the staff to replace the passivation liquid and / or the cleaning liquid in time.

[0020] As a preferred embodiment of the present invention, the passivation solution is a nitric acid solution. The concentration of the passivation solution is usually between 3% and 50%.

[0021] As preferred embodiment of the present invention, the concentration of the passivation solution is 15-45%.

[0022] As preferred embodiment of the present invention, the concentration of the passivation solution is 20%.

[0023] As a preferred embodiment of the present invention, the passivation treatment time is 10 to 30 minutes.

[0024] The infusion pump of the small-caliber stainless steel long tube inner surface passivation cleaning integrated machine provided by the present invention is an adjustable gear pump, and the gear pump is connected to the liquid outlet of the passivation liquid storage box through a liquid inlet pipe and a liquid outlet pipe, and the liquid outlet pipe is connected to the small-caliber stainless steel long tube through an end docking connection structure, so the passivation liquid enters the small-caliber stainless steel long tube from the passivation liquid storage box, and finally enters the passivation liquid storage box through the end docking connection structure and the reflux pipe at the tail of the small-caliber stainless steel long tube to achieve sealed circulation. The adjustable gear pump can adjust the passivation liquid flow rate according to the size and quantity of the pipeline; the passivation liquid is located in the closed passivation liquid storage box and can be accurately adjusted according to the temperature requirements; after the passivation is completed, the gear pump is reversed to suck the passivation liquid inside the small-caliber stainless steel long tube and the passivation liquid inside the pipeline back into the passivation liquid storage box, and then pure water is passed to clean the small-caliber stainless steel long tube; pH detection mechanisms are evenly present in the passivation liquid storage box and the water storage tank, and if it does not meet the standard, an alarm is issued and the liquid is subsequently processed.

[0025] The cleaning liquid circulation supply mechanism of the present invention can be used for a small-diameter stainless steel long tube. First, the passivation liquid inside the pipeline and the small-diameter stainless steel long tube is recycled into the passivation liquid storage tank through the reverse rotation of the gear pump, and then the acid inlet valve and the acid discharge valve are closed, the water inlet valve is opened, and the diaphragm pump is started to flush the pure water in the water storage tank into the small-diameter stainless steel long tube, and then the water enters the water storage tank through the end docking connection structure and the reflux pipe to form a flushing cycle. The passivation liquid storage tank and the pipeline for conveying liquid are made of PP material.

[0026] The present invention also provides a passivation cleaning method based on the small-caliber stainless steel long tube inner surface passivation cleaning integrated machine, which is characterized by comprising the following steps: Select the required passivation solution and passivation cleaning formula based on the type of small-diameter stainless steel long tube; The control mechanism retrieves the passivation cleaning recipe and generates corresponding operation instructions according to the selected passivation cleaning recipe; the operation instructions are used to instruct to perform corresponding operations on the working parameters corresponding to the passivation cleaning recipe; the passivation cleaning recipe is stored in the internal address of the central controller of the control mechanism; The control mechanism sends an operation instruction to the passivation liquid circulation supply unit, and the passivation liquid circulation supply unit configures the passivation liquid of a set concentration and delivers a set amount of passivation liquid to the passivation liquid circulation conveying unit; The control mechanism sends an operating instruction to the temperature control system, and the passivation liquid is maintained at the set temperature under the action of the temperature control system; The control mechanism sends an operation instruction to the passivation liquid circulation and delivery part, and the infusion pump, the acid inlet valve, and the acid discharge valve operate according to the received operation instruction. After each small-diameter stainless steel long tube is filled with the passivation liquid, the infusion pump adjusts the flow rate of the passivation liquid to circulate in the passivation liquid supply passage at the flow rate and passivation time set in the passivation cleaning formula, and completes the passivation treatment of the inner wall of each small-diameter stainless steel long tube during the circulation process of the passivation liquid; After the inner wall of each small-diameter stainless steel long tube is passivated, the control mechanism controls the infusion pump to reverse and deliver the passivation liquid in the passivation liquid supply passage into the passivation liquid storage tank; The control mechanism sends an operation instruction to the cleaning liquid circulation and delivery part, and the cleaning pump, the water inlet valve, and the drain valve operate according to the received operation instruction. After each small-diameter stainless steel long tube is filled with cleaning liquid, the cleaning pump adjusts the flow rate of the cleaning liquid to circulate in the cleaning liquid supply passage according to the flow rate and cleaning time set in the passivation cleaning formula, and completes the cleaning treatment of the inner wall of each small-diameter stainless steel long tube during the cleaning liquid circulation process; After the cleaning of the inner walls of each small-diameter stainless steel long tube is completed, the control mechanism controls the cleaning pump to reverse and send the cleaning liquid in the cleaning liquid supply passage into the cleaning liquid storage tank to complete the passivation cleaning treatment of the small-diameter stainless steel long tube.

[0027] Before the passivation operation, a small-diameter stainless steel long tube needs to be installed in the passivation box, including: Place a small-caliber stainless steel long tube on the rack and fix it in an inclined state; The small-diameter stainless steel long tube is connected to the passivation liquid circulation supply mechanism and the cleaning liquid circulation supply mechanism through the end butt connection structure.

[0028] The passivation liquid is maintained at a set temperature by the temperature control system, including: The temperature sensor detects the temperature of the passivation liquid in the passivation liquid storage tank and transmits the detected temperature data to the central controller; The central controller controls the operation of the electric heating component or the cooling circulation mechanism according to the temperature data to heat or cool the passivation liquid to a set temperature step.

[0029] If the temperature sensor detects that the temperature of the passivation liquid has not reached the expected temperature, the electric heating component will work and continue to heat the passivation liquid in the passivation liquid storage tank. If the temperature sensor detects that the temperature of the passivation liquid exceeds the expected temperature, the electric heating component will stop working, and the passivation liquid in the passivation liquid storage tank can be maintained at the set temperature through the temperature control system.

[0030] Through design improvements, this device meets the requirements of passivation-cleaning of the inner surface of small-diameter stainless steel long tubes, which can effectively improve work efficiency and ensure good passivation quality; significantly reduce the amount of passivation liquid used and have good economic performance; the passivation liquid is stored and transported in a closed environment and has good environmental friendliness; cleaning-passivation is carried out on one device, which can reduce the number of handling times, avoid bending of small-diameter stainless steel long tubes, and also improve work efficiency.

[0031] The beneficial effects of the present invention are: 1. The device can select different passivation cleaning formulas according to the material type and other performance parameters of the small-diameter stainless steel long tube; 2. The device can ensure that the passivation liquid on the inner surface of small-diameter stainless steel long tubes has precise temperature control and steady-speed circulation flow characteristics, which can improve the passivation quality of the inner surface of small-diameter stainless steel long tubes and improve work efficiency; 3. The device significantly reduces the amount of passivation liquid used, and the passivation liquid is stored and transported in a closed environment, which is economical and environmentally friendly; 4. The passivation-cleaning stage of the device can be used in one device, reducing the number of handling times and avoiding the bending of small-diameter stainless steel long tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The present invention is a flow chart of a passivation cleaning method of a small-caliber stainless steel long tube inner surface passivation cleaning integrated machine.

[0033] Figure 2 It is a front view of the integrated machine for passivation and cleaning of the inner surface of a small-caliber stainless steel long tube of the present invention.

[0034] Figure 3 It is a side view of the integrated machine for passivation and cleaning of the inner surface of a small-caliber stainless steel long tube of the present invention.

[0035] Figure 4 for Figure 2 A partial enlarged view of .

[0036] Figure 5 for Figure 3 One of the partial enlarged images.

[0037] Figure 6 for Figure 3 The second partial enlarged image.

[0038] Figure 7 It is a structural schematic diagram of the butt joint of the present invention.

[0039] Figure 8 and Fig. 9 They are XPS graphs comparing the inner surface of the C22 small-diameter stainless steel long tube before and after passivation in Example 1 of the present invention.

[0040] Fig.10 and Fig.11 They are respectively data diagrams comparing the Cr / Fe ratio of the inner surface of the C22 small-diameter stainless steel long tube before and after passivation in Example 1 of the present invention.

[0041] In the attached figure: 1-passivation box; 11-box body; 12-box door; 13-end docking connection structure; 14-shelf; 131-main connecting pipe; 132-butt joint; 2-passivation liquid circulation supply mechanism; 21-passivation liquid configuration supply unit; 211-stock liquid tank; 212-water storage tank; 213-peristaltic pump; 22-passivation liquid circulation delivery unit; 221-passivation liquid storage tank; 222-liquid inlet pipe; 223-infusion pump; 224-liquid outlet pipe; 3-cleaning liquid circulation supply mechanism; 31-cleaning liquid storage tank; 32-water inlet pipe; 33-cleaning pump; 34-water outlet pipe; 4-control mechanism; 41-temperature control system; 42-central controller; 431-liquid supply valve; 432-acid inlet valve; 433-acid discharge valve; 434-water inlet valve; 435-drain valve; 436-reflux valve; 5-pH detection mechanism; 6- Early warning agencies; 7- small diameter stainless steel long tube; 71- first reflux pipe; 72- second reflux pipe. DETAILED DESCRIPTION

[0042] The following describes the implementation of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application.

[0043] It should be noted that the process equipment or devices not specifically specified in the following embodiments are all conventional equipment or devices in the art.

[0044] In addition, it should be understood that one or more method steps mentioned in this application do not exclude the existence of other method steps before or after the combination step or the insertion of other method steps between these explicitly mentioned steps, unless otherwise specified; it should also be understood that the combination connection relationship between one or more devices / apparatuses mentioned in this application does not exclude the existence of other devices / apparatuses before or after the combination device / apparatus or the insertion of other devices / apparatuses between these two explicitly mentioned devices / apparatuses, unless otherwise specified. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or the scope of implementation of this application. Changes or adjustments in their relative relationships shall also be regarded as the scope of implementation of this application without substantial changes in the technical content.

[0045] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0046] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0047] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0049] The present application is further described below in conjunction with specific embodiments, but the protection scope of the present application is not limited thereto.

[0050] like Figure 2~Figure 7 As shown, the small-caliber stainless steel long tube inner surface passivation cleaning integrated machine of the present invention comprises: A passivation box 1, wherein the passivation box 1 has a small-caliber stainless steel long tube 7 to be passivated; The passivation liquid circulation supply mechanism 2 comprises a passivation liquid configuration supply part 21 and a passivation liquid circulation conveying part 22, wherein the passivation liquid configuration supply part 21 is configured to configure a passivation liquid of a set concentration and to deliver the configured passivation liquid to the circulation conveying part 22, wherein a liquid inlet and a liquid outlet of the passivation liquid circulation conveying part 22 are respectively connected to two ends of a small-diameter stainless steel long tube 7 in the passivation box 1, so as to form a circulating passivation liquid supply passage, which is used for circulating the passivation liquid to the small-diameter stainless steel long tube 7 in the passivation box 1, or draining the passivation liquid; A cleaning liquid circulation supply mechanism 3, wherein the cleaning liquid circulation supply mechanism 3 is respectively connected to both ends of the small-diameter stainless steel long tube 7 in the passivation box 1 to form a circulating cleaning liquid supply passage, and is used to circulate the cleaning liquid to the small-diameter stainless steel long tube 7 in the passivation box 1, or to drain the cleaning liquid; and / or The control mechanism 4 includes a temperature control system 41 and a central controller 42. The temperature control system 41 is configured to control the temperature of the passivation liquid in the passivation liquid circulation supply mechanism 2; the central controller 42 is electrically connected to the passivation liquid circulation supply mechanism 2, the cleaning liquid circulation supply mechanism 3, and the temperature control system 41.

[0051] like Figure 2~Figure 7 As shown, the small-diameter stainless steel long tube inner surface passivation cleaning integrated machine described in the present invention also includes a pH detection mechanism 5, which is arranged on the passivation liquid circulation supply mechanism 2 and the cleaning liquid circulation supply mechanism 3, and is used to detect the pH value of the passivation liquid and the cleaning liquid.

[0052] like Figure 2~Figure 7As shown, the passivation box 1 includes a rectangular box body 11 and a box door 12 arranged on the box body 11, and the box wall of the box body 11 is provided with an end docking connection structure 13 for fixing and connecting the inner cavity of the small-diameter stainless steel long tube 7, and the interior of the box body 11 is provided with a storage rack 14 for supporting the small-diameter stainless steel long tube 7.

[0053] In some embodiments of the present invention, the side of the box body 11 is provided with a material access opening for placing the small-caliber stainless steel long tube 7, and the box door is installed at the material access opening of the box body in an openable or drawable manner. Figure 2 As shown, the box door 12 is connected to the box body 11 in a pullable manner, and a lifting mechanism for driving the box door to slide up and down can be set between the box door 12 and the box body 11. The lifting mechanism is set on the box body, and the lifting end of the lifting mechanism is connected to the box door. The lifting mechanism is electrically connected to the control mechanism. When it is necessary to take and put a small-diameter stainless steel long tube, the lifting mechanism drives the box door to rise. When it is necessary to passivate and clean the small-diameter stainless steel long tube, the box door can be driven down to close the material taking and putting port on the side of the box body to effectively prevent the evaporation of the passivation liquid.

[0054] like Figure 2~Figure 7 As shown, the end butt-jointed connecting structure 13 includes a main connecting pipe 131 and a plurality of butt joints 132 connected to the main connecting pipe 131. The plurality of butt joints 132 are passed through the wall of the passivation box 1. The end of the butt joint 132 located outside the passivation box 1 is connected to the main connecting pipe 131, and the end of the butt joint 132 located inside the passivation box 1 is plugged into and matched with one end of the small-diameter stainless steel long tube 7.

[0055] like Figure 2~Figure 7 As shown, the storage rack 14 includes a plurality of long tube fixings arranged along the length direction of the box body 11 , and the heights of the plurality of long tube fixings gradually increase or decrease in the length direction of the box body 11 , so as to realize the inclined arrangement of the small-diameter stainless steel long tube 7 .

[0056] like Figure 2~Figure 7 As shown, the passivation liquid configuration supply unit 21 includes a stock liquid tank 211, a water storage tank 212 and a peristaltic pump 213. The stock liquid tank 211 stores the passivation liquid stock, and the water storage tank 212 stores water for diluting the passivation liquid stock; the stock liquid tank 211 and the water storage tank 212 are connected to the inlet pipeline of the peristaltic pump 213, and the outlet of the peristaltic pump 213 is connected to the feeding port pipeline of the passivation liquid circulation and conveying unit 22; the peristaltic pump 213 is electrically connected to the central controller 42 of the control mechanism 4.

[0057] like Figure 2~Figure 7As shown, the passivation liquid circulation and transportation part 22 includes a passivation liquid storage tank 221, a liquid inlet pipe 222, an infusion pump 223 and a liquid outlet pipe 224 connected in sequence, one end of each of the small-diameter stainless steel long tubes 7 is connected to the liquid outlet pipe 224 through an end docking connecting structure 13, and the other end of each of the small-diameter stainless steel long tubes 7 is connected to the passivation liquid storage tank 221 through a first reflux pipe 71.

[0058] In some embodiments of the present invention, the infusion pump 223 is a gear pump.

[0059] In some embodiments of the present invention, a stirring device is provided on the passivation liquid storage tank 221 , and the passivation liquid in the passivation liquid storage tank 221 can be stirred.

[0060] In some embodiments of the present invention, the temperature control system 41 includes a temperature sensor and an electric heating component which are arranged on the passivation liquid storage tank 221 and are electrically connected to the control mechanism. The electric heating component is arranged in the passivation liquid storage tank 221, and the probe of the temperature sensor extends into the passivation liquid storage tank 221. Since the passivation liquid releases heat during the configuration process, the released heat can assist the temperature control system 41 in heating the passivation liquid. If the temperature sensor detects that the temperature of the passivation liquid does not reach the expected temperature, the electric heating component works and continues to heat the passivation liquid in the passivation liquid storage tank 221. If the temperature sensor detects that the temperature of the passivation liquid exceeds the expected temperature, the electric heating component stops working, and the passivation liquid in the passivation liquid storage tank 221 can be maintained at the set temperature through the temperature control system 41.

[0061] In some embodiments of the present invention, the temperature control system 41 also includes a cooling circulation mechanism for cooling the passivation liquid in the passivation box. The cooling circulation mechanism can adopt a conventional cooling structure as long as it can play a cooling effect. In the present application, the cooling circulation mechanism includes a cooling coil and a cooling control valve arranged on the cooling coil, the cooling coil is wound on the outer wall of the passivation liquid storage box, and the cooling coil is externally connected to the coolant. If the temperature sensor detects that the temperature of the passivation liquid exceeds the expected temperature by a large amount, the cooling circulation mechanism works to cool the passivation liquid in the passivation liquid storage box, and the passivation liquid in the passivation liquid storage box can be maintained at a set temperature through the temperature control system. Usually, when the temperature of the passivation liquid exceeds the expected temperature by a small amount (such as within 3°C), there is no need to start the cooling circulation mechanism. If the temperature of the passivation liquid exceeds the expected temperature by a large amount (such as above 3°C), the cooling circulation mechanism can be started while the electric heating component is stopped, so as to achieve the effect of regulating the temperature of the passivation liquid.

[0062] like Figure 2~Figure 7As shown, the cleaning liquid circulation supply mechanism 3 includes a cleaning liquid storage tank 31, an inlet pipe 32, a cleaning pump 33 and an outlet pipe 34 connected in sequence. One end of each of the small-diameter stainless steel long tubes 7 is connected to the cleaning pump 33 through the outlet pipe 34, and the other end of each of the small-diameter stainless steel long tubes 7 is connected to the cleaning liquid storage tank 31 through a second return pipe 72.

[0063] In some embodiments of the present invention, the cleaning pump 33 is a diaphragm pump.

[0064] In some embodiments of the present invention, the control mechanism 4 also includes a regulating valve group, and each control valve of the regulating valve group is arranged on the pipelines of the passivation liquid configuration supply part 21, the passivation liquid circulation supply mechanism 2, and the cleaning liquid circulation supply mechanism 3, and is electrically connected to the central controller 42, for controlling the status of the passivation liquid circulation supply mechanism 2, the cleaning liquid circulation supply mechanism 3, and the temperature control system 41.

[0065] like Figure 2~Figure 7 As shown, the regulating valve group includes a liquid supply valve 431 for controlling the on-off of the corresponding pipeline of the passivation liquid configuration supply part 21, an acid inlet valve 432 and an acid discharge valve 433 for controlling the on-off of the corresponding pipeline of the passivation liquid circulation and conveying part 22, and a water inlet valve 434 and a water discharge valve 435 for controlling the on-off of the corresponding pipeline of the cleaning liquid circulation supply mechanism 3. The liquid supply valve 431 is arranged on the pipeline between the passivation liquid storage tank 221 and the peristaltic pump 212; the acid inlet valve 432 is arranged at the liquid outlet of the passivation liquid storage tank 221 and is connected to the liquid inlet pipe 222; the acid discharge valve 433 is arranged at the acid discharge port of the passivation liquid storage tank 221; the water inlet valve 434 is arranged at the water outlet of the cleaning liquid storage tank 31 and is connected to the pipeline of the cleaning pump 33; the water discharge valve 435 is arranged on the second reflux pipe 72 connected to the cleaning liquid storage tank 31, and.

[0066] In some embodiments of the present invention, the small-diameter stainless steel long tube inner surface passivation and cleaning integrated machine described in the present invention also includes an early warning mechanism 6, which is arranged on the passivation box, and the early warning mechanism is connected to the central controller of the control mechanism, and is used to issue an early warning message when the pH value of the passivation liquid and / or the cleaning liquid exceeds a preset threshold value, reminding the staff to replace the passivation liquid and / or the cleaning liquid in time.

[0067] In some embodiments of the present invention, the passivation solution is a nitric acid solution. The concentration of the nitric acid solution is usually between 3% and 50%. Compared with other passivation methods, the nitric acid type passivation process of stainless steel has three main characteristics: 1. Stainless steel is in a passive state rather than an active state in nitric acid of appropriate concentration. The nitric acid passivation process is easy to control and has good reproducibility. A passivation film with a nanometer thickness is generated on the surface of stainless steel, and there is no visible color change on the surface before and after the treatment; 2. Stainless steel is in a passive state in a nitric acid solution of appropriate concentration, without obvious active dissolution reaction, the composition and properties of the passivation solution are relatively stable, the treatment process is easy to operate and does not require other additives; 3. No sealing treatment is required after nitric acid passivation: because the passivation film formed by nitric acid passivation has good density and small pore size, and this step is indispensable in the subsequent treatment of other passivation processes. In Fe-Cr alloys, when the Cr content in the matrix reaches more than 13%, a continuous, dense, and Cr-rich passivation film with excellent protective performance will be formed on the surface. Regarding the stability evaluation of the passivation film, the Cr / Fe ratio in the passivation film is usually used as one of the evaluation criteria. It is believed that the larger the Cr / Fe ratio, the more stable the film and the better the protection. During the passivation treatment, low concentrations of nitric acid (such as 3%) can play a chemical polishing effect in the passivation process of zinc, improve the brightness and flatness of the coating, thereby improving the appearance after passivation and the firmness of the passivation film. In certain specific industrial applications, such as the passivation treatment of pharmaceutical water, the concentration of nitric acid is required to be 8%. This is an 8% nitric acid solution prepared by adding chemically pure nitric acid to the purified water tank, which is used for the passivation treatment of purified water tanks and pipeline distribution systems. When treating stainless steel with dilute nitric acid, the concentration is usually between 15 and 45%. It is preferably 20%, and the passivation treatment time is 10 to 30 minutes, preferably 20 minutes, which helps to remove the dust on the surface and perform film removal.

[0068] like Figure 1 As shown, the passivation cleaning method according to the present invention based on the small-caliber stainless steel long tube inner surface passivation cleaning integrated machine comprises the following steps: S1 determines the passivation solution and the passivation cleaning formula based on the type of the small-diameter stainless steel long tube 7; S2 uses the passivation liquid circulation supply unit to configure the passivation liquid of a set concentration and feeds a set amount of passivation liquid into the passivation liquid circulation conveying unit 22; S3: the control mechanism 4 retrieves the passivation cleaning recipe and generates corresponding operation instructions according to the selected passivation cleaning recipe; the operation instructions are used to instruct to perform corresponding operations on the working parameters corresponding to the passivation cleaning recipe; the passivation cleaning recipe is stored in the internal address of the central controller 42 of the control mechanism 4; S4 The control mechanism 4 sends an operation instruction to the temperature control system 41, and the passivation liquid is maintained at a set temperature under the action of the temperature control system 41; S5: The control mechanism 4 sends an operation instruction to the passivation liquid circulation and conveying part 22, and the infusion pump 223, the acid inlet valve 432, and the acid discharge valve 433 operate according to the received operation instruction. After each small-diameter stainless steel long tube 7 is filled with the passivation liquid, the infusion pump 223 regulates the flow rate of the passivation liquid to circulate in the passivation liquid supply passage at the flow rate and passivation time set in the passivation cleaning formula, and the passivation treatment of the inner wall of each small-diameter stainless steel long tube 7 is completed during the circulation of the passivation liquid; S6 After the inner wall of each small-diameter stainless steel long tube 7 is passivated, the control mechanism 4 controls the infusion pump 223 to reverse and deliver the passivation liquid in the passivation liquid supply passage into the passivation liquid storage tank 221; S7 control mechanism 4 sends an operation instruction to the cleaning liquid circulation and delivery part, and the cleaning pump 33 and the water inlet valve 434 and the drain valve 435 operate according to the received operation instruction. After each small-diameter stainless steel long tube 7 is filled with cleaning liquid, the cleaning pump 33 adjusts the flow rate of the cleaning liquid so that it circulates in the cleaning liquid supply passage at the flow rate and cleaning time set in the passivation cleaning formula, and completes the cleaning treatment of the inner wall of each small-diameter stainless steel long tube 7 during the cleaning liquid circulation process; S8 After the cleaning of the inner walls of each small-diameter stainless steel long tube 7 is completed, the control mechanism 4 controls the cleaning pump 33 to reverse, and sends the cleaning liquid in the cleaning liquid supply passage into the cleaning liquid storage tank 31 to complete the passivation cleaning treatment of the small-diameter stainless steel long tube 7.

[0069] Before step S1, a small-diameter stainless steel long tube needs to be installed in the passivation box, including: Place a small-caliber stainless steel long tube on the rack and fix it in an inclined state; The small-caliber stainless steel long tube is connected to the passivation liquid circulation supply mechanism and the cleaning liquid circulation supply mechanism through the end butt connection structure 13.

[0070] In step S4, the passivation solution is maintained at a set temperature under the action of the temperature control system 41, including: S41: The temperature sensor detects the temperature of the passivation liquid in the passivation liquid storage tank 221 and transmits the detected temperature data to the central controller; S42 The central controller controls the operation of the electric heating component or the cooling circulation mechanism according to the temperature data to heat or cool the passivation liquid to a set temperature step.

[0071] If the temperature sensor detects that the temperature of the passivation liquid has not reached the expected temperature, the electric heating component will work to continue heating the passivation liquid in the passivation liquid storage tank 221. If the temperature sensor detects that the temperature of the passivation liquid exceeds the expected temperature, the cooling circulation mechanism will work to pass coolant into the cooling coil to cool the passivation liquid in the passivation liquid storage tank 221. The temperature control system 41 can maintain the passivation liquid in the passivation liquid storage tank 221 at the set temperature.

[0072] Example 1 In this example, a C22 small-caliber stainless steel long tube with an outer diameter of 12.7 mm (1 / 2 inch) is used as a passivation example. The specific steps are as follows: Install the small-diameter stainless steel long tube: place the small-diameter stainless steel long tube on the rack and fix it in an inclined state, the liquid inlet of the small-diameter stainless steel long tube is connected to the end docking connection structure 13, and the liquid outlet of the small-diameter stainless steel long tube is connected to the passivation liquid storage tank 221 and the water inlet pipe 32 through the end docking connection structure 13 and the reflux pipe connection; Determine the required passivation solution and passivation cleaning formula based on the type of the small-diameter stainless steel long tube 7; The control mechanism 4 retrieves the passivation cleaning recipe and generates corresponding operation instructions according to the selected passivation cleaning recipe; the operation instructions are used to instruct to perform corresponding operations on the working parameters corresponding to the passivation cleaning recipe; the passivation cleaning recipe is stored in the internal address of the central controller 42 of the control mechanism 4; The control mechanism 4 sends an operation instruction to the passivation liquid circulation supply unit, and the peristaltic pump in the passivation liquid circulation supply unit draws the passivation liquid stock solution and water into the passivation liquid storage tank 221 in proportion, stirs, and prepares 40 liters of 20% HNO3; during the preparation process, the stirring device is operated, and the acid discharge valve and the acid inlet valve are closed; The control mechanism 4 sends an operation instruction to the temperature control system 41, and the passivation liquid is maintained at 50°C under the action of the temperature control system 41; After the temperature of the passivation solution in the passivation solution storage tank 221 reaches 50° C. and is maintained for 5 minutes, the acid inlet valve of the passivation solution storage tank 221 is opened; Turn on the infusion pump 223 and set the flow rate to 2000 ml / min. The passivation liquid in the passivation liquid storage tank 221 enters into 10 small-diameter stainless steel long tubes through the infusion pump 223 via the PP transport channel. After the long tubes are completely filled with the passivation liquid, the infusion pump 223 continues to operate, and the passivation liquid in the small-diameter stainless steel long tubes enters the passivation liquid storage tank 221 to achieve circulation; When the passivation liquid is initially running, observe whether there is passivation liquid flowing out of the reflux pipe to ensure that each pipe is filled with passivation liquid. Then observe whether there is leakage in the circulation system. If there is leakage, shut down the infusion pump 223 immediately and reinstall it. After the inspection is completed, after the system is stable after passivation for 20 minutes, the flow rate of the small infusion pump 223 can be adjusted to ensure that the passivation liquid continues to run inside the stainless steel long tube to realize the circulation of the passivation liquid, and then the box door can be closed; After the passivation is completed, the temperature control system is turned off and the infusion pump 223 is reversed to allow the passivation liquid in the small-caliber stainless steel long tube and the pipeline to be recovered and sealed in the passivation liquid storage tank 221; Close the acid inlet valve 432 and the acid discharge valve 433, open the water inlet valve 434 and the discharge valve 435, and then turn on the cleaning pump 33 to allow pure water to flush the inner surface of the small-diameter stainless steel long tube for 3 minutes to complete the passivation-cleaning treatment of the small-diameter stainless steel long tube.

[0073] The inner surface of the small-diameter stainless steel long tube after passivation and cleaning was sampled for XPS detection, and the results are shown in Table 1.

[0074] Table 1 Before passivation After passivation Cr / Fe 1.05 3.39 Data such as Figure 8~Figure 11 As shown, the analysis shows that the Cr / Fe ratio before passivation is 1.05, which significantly increases to 3.39 after passivation. This shows that the device can be used for passivation-cleaning of small-diameter stainless steel long tubes, and can effectively improve the corrosion resistance of the inner surface of small-diameter stainless steel long tubes.

[0075] The above examples are for the purpose of illustrating the embodiments disclosed by the present invention and are not to be construed as limitations of the present invention. In addition, the various modifications listed herein and the variations of methods and compositions in the invention are obvious to those skilled in the art without departing from the scope and spirit of the present invention. Although the present invention has been specifically described in conjunction with various specific preferred embodiments of the present invention, it should be understood that the present invention should not be limited to these specific embodiments. In fact, various modifications obvious to those skilled in the art as described above to obtain the invention should be included within the scope of the present invention.

Claims

1. Small-caliber stainless steel long tube inner surface passivation cleaning machine, characterized by: include: A passivation box (1), wherein the passivation box (1) contains a small-caliber stainless steel long tube (7) to be passivated; The passivation liquid circulation supply mechanism (2) comprises a passivation liquid configuration supply unit (21) and a passivation liquid circulation conveying unit (22), wherein the passivation liquid configuration supply unit (21) is configured to configure a passivation liquid of a set concentration and convey the configured passivation liquid into the circulation conveying unit (22), wherein a liquid inlet and a liquid outlet of the passivation liquid circulation conveying unit (22) are respectively connected to two ends of a small-diameter stainless steel long tube (7) in a passivation box (1), forming a circulating passivation liquid supply passage, and used for circulating the passivation liquid into the small-diameter stainless steel long tube (7) in the passivation box (1), or draining the passivation liquid; a cleaning liquid circulation supply mechanism (3), the cleaning liquid circulation supply mechanism (3) being connected to both ends of the small-diameter stainless steel long tube (7) in the passivation box (1) to form a circulating cleaning liquid supply passage, and being used to circulate the cleaning liquid into the small-diameter stainless steel long tube (7) in the passivation box (1), or to drain the cleaning liquid; and / or A control mechanism (4), the control mechanism (4) comprising a temperature control system (41) and a central controller (42), the temperature control system (41) being configured to control the temperature of the passivation liquid in the passivation liquid circulation supply mechanism (2); the central controller (42) being electrically connected to the passivation liquid circulation supply mechanism (2), the cleaning liquid circulation supply mechanism (3), and the temperature control system (41).

2. The small-caliber stainless steel long tube inner surface passivation cleaning integrated machine according to claim 1 is characterized by: It also comprises a pH detection mechanism (5), which is arranged on the passivation liquid circulation supply mechanism (2) and the cleaning liquid circulation supply mechanism (3) and is used to detect the pH value of the passivation liquid and the cleaning liquid.

3. The small-caliber stainless steel long tube inner surface passivation cleaning integrated machine according to claim 1 is characterized by: The passivation box (1) comprises a box body (11) in the shape of a rectangular parallelepiped and a box door (12) arranged on the box body (11); an end butt connection structure (13) for fixing and connecting the inner cavity of a small-diameter stainless steel long tube (7) is provided on the box wall of the box body (11); and a storage rack (14) for supporting the small-diameter stainless steel long tube (7) is provided inside the box body (11).

4. The small-caliber stainless steel long tube inner surface passivation cleaning integrated machine according to claim 3 is characterized by: The end butt-jointed connecting structure (13) comprises a main connecting pipe (131) and a plurality of butt joints (132) connected to the main connecting pipe (131); the plurality of butt joints (132) are arranged on the wall of the passivation box (1); the ends of the butt joints (132) located outside the passivation box (1) are connected to the main connecting pipe (131); and the ends of the butt joints (132) located inside the passivation box (1) are plugged into and matched with one end of the small-diameter stainless steel long tube (7).

5. The small-caliber stainless steel long tube inner surface passivation cleaning integrated machine according to claim 3 is characterized by: The storage rack (14) comprises a plurality of long tube fixing members arranged along the length direction of the box body (11), and the heights of the plurality of long tube fixing members gradually increase or decrease in the length direction of the box body (11), so as to realize the inclined arrangement of the small-caliber stainless steel long tubes (7).

6. The small-caliber stainless steel long tube inner surface passivation cleaning integrated machine according to claim 1, characterized in that: The passivation liquid configuration supply unit (21) comprises a stock liquid tank (211), a water storage tank (212) and a peristaltic pump (213); the stock liquid tank (211) stores a passivation liquid stock solution, and the water storage tank (212) stores water for diluting the passivation liquid stock solution; the stock liquid tank (211), the water storage tank (212) and an inlet pipeline of the peristaltic pump (213) are connected, and the outlet of the peristaltic pump (213) is connected to a feed port pipeline of the passivation liquid circulation and transportation unit (22).

7. The small-caliber stainless steel long tube inner surface passivation cleaning integrated machine according to claim 1 is characterized by: The passivation liquid circulation and transportation part (22) comprises a passivation liquid storage tank (221), a liquid inlet pipe (222), a liquid infusion pump (223), and a liquid outlet pipe (224) which are connected in sequence. The ends of each of the small-diameter stainless steel long tubes (7) are butt-jointed with a connecting structure (13) and a first reflux pipe (71). One end of the small-diameter stainless steel long tube (7) is connected to the liquid outlet pipe (224) via the end butt-jointed connecting structure (13), and the other end is connected to the passivation liquid storage tank (221) via the first reflux pipe (71).

8. The integrated machine for passivation and cleaning the inner surface of a small-caliber stainless steel long tube according to claim 7, characterized in that: The cleaning liquid circulation supply mechanism (3) comprises a cleaning liquid storage tank (31), a water inlet pipe (32), a cleaning pump (33) and a water outlet pipe (34) which are connected in sequence; both ends of each of the small-diameter stainless steel long tubes (7) are connected to an end-butt connection structure (13) and a second return pipe (72); one end of the small-diameter stainless steel long tube (7) is connected to the water outlet pipe (34) via the end-butt connection structure (13), and the other end is connected to the cleaning liquid storage tank (31) via the second return pipe (72).

9. The integrated machine for passivation and cleaning the inner surface of a small-caliber stainless steel long tube according to claim 8, characterized in that: The control mechanism (4) further comprises a regulating valve group, wherein each control valve of the regulating valve group is arranged on the pipelines of the passivation liquid configuration supply part (21), the passivation liquid circulation supply mechanism (2), and the cleaning liquid circulation supply mechanism (3), and is electrically connected to the central controller, and is used to control the on / off state of the passivation liquid circulation supply mechanism, the cleaning liquid circulation supply mechanism, and the temperature control system.

10. A passivation cleaning method based on the integrated machine for passivation cleaning of the inner surface of a small-caliber stainless steel long tube according to any one of claims 1 to 9, characterized in that: The following steps are involved: Determining the required passivation solution and passivation cleaning formula based on the type of the small-diameter stainless steel long tube (7); The control mechanism (4) retrieves the passivation cleaning recipe and generates corresponding operation instructions according to the selected passivation cleaning recipe; the operation instructions are used to instruct to perform corresponding operations on the working parameters corresponding to the passivation cleaning recipe; the passivation cleaning recipe is stored in an internal address of a central controller (42) of the control mechanism (4); The control mechanism (4) sends an operation instruction to the passivation liquid circulation supply unit, and the passivation liquid circulation supply unit configures a passivation liquid of a set concentration and delivers a set amount of passivation liquid to the passivation liquid circulation conveying unit (22); The control mechanism (4) sends an operation instruction to the temperature control system (41), and the passivation liquid is maintained at a set temperature under the action of the temperature control system (41); The control mechanism (4) sends an operation instruction to the passivation liquid circulation and delivery part (22), and the infusion pump (223) and the acid inlet valve (432) and the acid discharge valve (433) operate according to the received operation instruction. After each small-diameter stainless steel long tube (7) is filled with the passivation liquid, the infusion pump (223) adjusts the flow rate of the passivation liquid so that the passivation liquid circulates in the passivation liquid supply passage at a flow rate and passivation time set in the passivation cleaning formula, and the passivation treatment of the inner wall of each small-diameter stainless steel long tube (7) is completed during the circulation of the passivation liquid; After the inner wall of each small-diameter stainless steel long tube (7) is passivated, the control mechanism (4) controls the infusion pump (223) to reverse and deliver the passivation liquid in the passivation liquid supply passage into the passivation liquid storage tank (221); The control mechanism (4) sends an operation instruction to the cleaning liquid circulation and delivery part, and the cleaning pump (33) and the water inlet valve (434) and the drain valve (435) operate according to the received operation instruction. After each small-diameter stainless steel long tube (7) is filled with cleaning liquid, the cleaning pump (33) adjusts the flow rate of the cleaning liquid so that the cleaning liquid circulates in the cleaning liquid supply passage at the flow rate and cleaning time set in the passivation cleaning formula, and the inner wall of each small-diameter stainless steel long tube (7) is cleaned during the cleaning liquid circulation process; After the cleaning of the inner wall of each small-diameter stainless steel long tube (7) is completed, the control mechanism (4) controls the cleaning pump (33) to reverse and send the cleaning liquid in the cleaning liquid supply passage into the cleaning liquid storage tank (31), thereby completing the passivation cleaning treatment of the small-diameter stainless steel long tube (7).

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