An automatic production line for phosphating petroleum pipe couplings and a method of use

Abstract

The application discloses a kind of petroleum pipe coupling phosphating automatic production line and use method, it is related to phosphating equipment technical field, including: rack, multiple functional grooves, track, gantry crane, multiple hangers, sliding wire traction device, crane positioning system, feeding roller way, discharging roller way, air suction system, production line closed system, electric control system, each functional groove is sequentially installed on rack, each functional groove sequentially arranged is used to implement each process of coupling workpiece phosphating respectively;Gantry crane can walk on track and can keep position after walking, and gantry crane can be lengthened or shortened in vertical direction;Hanger is used to be connected with the bottom end of gantry crane, and hanger can be put into each functional groove by gantry crane;Sliding wire traction device is used to be arranged on track to drive gantry crane to move on track;Simple structure, convenient to use, effectively improve production efficiency, high degree of automation, effectively reduce labor cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of phosphating equipment, in particular to a petroleum pipe coupling phosphating automatic production line and a use method. BACKGROUND

[0002] The petroleum special pipe production factory adopts butt coupling or pipe body thread surface surface treatment to improve the anti-sticking ability, including thread surface shot blasting, copper plating, zinc plating, tin plating, phosphating and the like. The main surface treatment mode at home and abroad is phosphating, and the main purpose of phosphating is to isolate the pipe body and the coupling thread surface by using the phosphating film to avoid the contact of similar materials and prevent sticking. Meanwhile, phosphating also has the effect of corrosion resistance, avoiding rust during production, manufacturing and storage. Phosphating is the process that metal forms a phosphate protective film on the metal surface by reacting with dilute phosphoric acid or acid phosphate solution. The phosphating process steps are more, including degreasing, pickling, surface adjustment, water washing and other pretreatment processes, also including water washing, saponification and other post-treatment processes. The previous manual operation method not only has low production efficiency, high cost and large labor intensity of workers. SUMMARY

[0003] The purpose of the present application is to provide a petroleum pipe coupling phosphating automatic production line and a use method, so as to solve the problems existing in the prior art, simple structure, convenient to use, effectively improve the production efficiency, high degree of automation, effectively reduce the labor cost.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following scheme:

[0005] The application provides a petroleum pipe coupling phosphating automatic production line, which comprises a rack, a plurality of functional grooves, a track, a gantry crane, a plurality of hangers, a sliding wire traction device, a crane positioning system, a feeding roller way, a discharging roller way, an air suction system, a production line sealing system, an electric control system, the rack is used for being installed on the ground, each functional groove is sequentially installed on the rack, and each functional groove which is sequentially arranged is used for implementing each process of coupling workpiece phosphating; the track is arranged on the rack and located above each functional groove; the gantry crane can walk on the track and keep the position after walking, and the gantry crane can be elongated or shortened in the vertical direction; the hanger is used for being hung with the bottom end of the gantry crane, the hanger is used for placing the coupling workpiece and can be put into each functional groove by the gantry crane; the sliding wire traction device is arranged on the track to drive the gantry crane to move on the track; the crane positioning system is arranged on the track to correspond to each functional groove; the feeding roller way is arranged below one end of the track to convey the hanger loaded with the coupling workpiece to the position capable of being hoisted by the gantry crane; the discharging roller way is arranged below the other end of the track; the air suction system comprises an exhaust treatment device, an air suction main pipe and a plurality of air suction points, the air suction main pipe is arranged on the top of the rack, one end of the air suction main pipe is connected with each air suction point and communicates, and the other end of the air suction main pipe is used for being connected with the exhaust treatment device and communicating; the production line sealing system is used for sealing the top and both sides of the rack; and the electric control system is signal connected with the gantry crane, the feeding roller way, the discharging roller way, the sliding wire traction device, the crane positioning system and the air suction system.

[0006] Preferably, each functional groove is a first ultrasonic degreasing groove, a second ultrasonic degreasing groove, a first water washing groove, a second water washing groove, an acid pickling groove, a third water washing groove, a fourth water washing groove, a surface adjusting groove, a first phosphating groove, a second phosphating groove, a third phosphating groove, a fifth water washing groove, a sixth water washing groove and a saponification groove which are sequentially arranged, the first ultrasonic degreasing groove and the second ultrasonic degreasing groove are the same in structure and are ultrasonic degreasing grooves, the ultrasonic degreasing groove comprises a first groove body, a first temperature measuring probe, a first electric heating piece and an ultrasonic cleaning piece, the first groove body is a double-layer structure with a filling layer arranged in the middle, the filling layer is filled with heat preservation material, the first groove body is provided with a first liquid inlet pipeline, a first flow valve, a first sewage pipeline and a first sewage valve, the first flow valve is arranged on the first liquid inlet pipeline, the first sewage valve is arranged on the first sewage pipeline, the first temperature measuring probe is arranged in the first groove body to measure the temperature in the first groove body, and the first temperature measuring probe is signal connected with the electric control system, the electric heating piece is arranged in the first groove body and signal connected with the electric control system, and the ultrasonic cleaning piece is arranged at the bottom of the first groove body.

[0007] Preferably, the first, second, third, fourth, fifth and sixth water washing tanks are of the same structure, the first water washing tank comprises a second tank body and a first air stirring device, the top of the second tank body is provided with a reverse flow structure to make the floating objects in the second tank body overflow, the first air stirring device is arranged at the bottom of the second tank body, the second tank body is provided with a second liquid inlet pipeline, a second sewage pipeline, a second flow valve and a second sewage valve, the second sewage valve is arranged on the second sewage pipeline, and the second flow valve is arranged on the second liquid inlet pipeline to adjust the flow of the second liquid inlet pipeline.

[0008] Preferably, the pickling tank comprises a third tank body, a second temperature measuring probe and a second electric heating device, the third tank body is of a double-layer structure, the inner layer of the third tank body is made of PE corrosion-resistant plastic, the second temperature measuring probe and the second electric heating device are arranged in the third tank body and are signal-connected with the electric control system, the third tank body is provided with a third liquid inlet pipeline, a third sewage pipeline, a third flow valve and a third sewage valve, the third flow valve is arranged on the third liquid inlet pipeline, and the third sewage valve is arranged on the third sewage pipeline.

[0009] Preferably, the surface conditioning tank comprises a fourth tank body, a second air stirring device, a fourth temperature measuring probe and a fourth electric heating device, the fourth tank body is of a double-layer structure with a filling layer arranged in the middle, the filling layer is filled with thermal insulation material, the second air stirring device is arranged at the bottom of the fourth tank body, and the second air stirring device is provided with a manually controlled valve to adjust the stirring amount, the fourth temperature measuring probe and the fourth electric heating device are arranged in the fourth tank body and are signal-connected with the electric control system, the fourth tank body is provided with a fourth liquid inlet pipeline, a fourth sewage pipeline, a fourth flow valve and a fourth sewage valve, the fourth flow valve is arranged on the fourth liquid inlet pipeline, and the fourth sewage valve is arranged on the fourth sewage pipeline.

[0010] Preferably, the first, second and third phosphating tanks are of the same structure, the first phosphating tank comprises a fifth tank body, a spraying system, a fifth temperature measuring probe and a heating system, the fifth tank body is of a double-layer structure with a filling layer arranged in the middle, the filling layer is filled with thermal insulation material, the bottom of the fifth tank body is of a conical structure, the spraying system is arranged at the top of the fifth tank body, the heating system is used for heating the fifth tank body, the fifth temperature measuring probe and the fifth electric heating device are arranged in the fifth tank body and are signal-connected with the electric control system, the fifth tank body is provided with a fifth liquid inlet pipeline, a fifth sewage pipeline, a fifth flow valve and a fifth sewage valve, the fifth flow valve is arranged on the fifth liquid inlet pipeline, and the fifth sewage valve is arranged on the fifth sewage pipeline.

[0011] Preferably, the heating system comprises an oil heater and a delivery pipe oil pump, the fifth tank body is provided with a heating interlayer, an output end of the oil heater is connected and communicated with an inlet of the heating interlayer through a first pipeline, an input end of the oil heater is connected and communicated with an outlet of the heating interlayer through a second pipeline, and the delivery pipe oil pump is arranged on the first pipeline.

[0012] Preferably, the saponification tank comprises a sixth tank body, a sixth temperature measuring probe and a fifth electric heating element, the sixth tank body is a double-layer structure with a filling layer arranged in the middle, the filling layer is filled with heat preservation material, the sixth temperature measuring probe and the fifth electric heating element are arranged in the sixth tank body and connected with the electric control system signal, the sixth tank body is provided with a sixth liquid inlet pipeline, a sixth blowdown pipeline, a sixth flow valve and a sixth blowdown valve, the sixth flow valve is arranged on the sixth liquid inlet pipeline, and the sixth blowdown valve is arranged on the sixth blowdown pipeline.

[0013] Preferably, the saponification tank further comprises a tank bottom liquid receiving disc, the tank bottom liquid receiving disc is arranged below each of the functional tank bodies to collect liquid discharged by each of the functional tank bodies.

[0014] The application further provides a use method of the oil pipe coupling phosphorization automatic production line.

[0015] The coupling workpiece to be treated is placed in a hanger and conveyed to a position capable of being hung by the gantry crane through the feeding roller way;

[0016] The gantry crane sequentially places the hanger in each functional tank body to complete corresponding process treatment;

[0017] After the treatment is completed, the gantry crane hoists the hanger to the discharging roller way to transfer and leave the production line.

[0018] The application has the following technical effects relative to the prior art:

[0019] The purpose of the present application is to provide a petroleum pipe coupling phosphating automatic production line and use method, the coupling workpiece to be treated is put into the hanger through the electric control and conveyed to the position capable of being connected by the gantry crane through the feeding roller way; the gantry crane puts the hanger into each functional groove in turn to complete the corresponding process treatment; after the treatment is completed, the gantry crane hoists the hanger to the discharging roller way for transfer and leaves the production line, the electric control system centrally controls the whole production line, the running state of each equipment can be monitored and controlled in real time, the safety of the production process is improved, the gantry crane cooperates with the track and the sliding wire traction device, can quickly and accurately move between each functional groove, realizes the automatic transfer of the coupling workpiece, greatly reduces the time and labor intensity of manual carrying, improves the production efficiency, the setting of the feeding roller way and the discharging roller way makes the feeding and discharging process of the workpiece more smooth and efficient, further speeds up the production rhythm, the crane positioning system can ensure that the gantry crane accurately puts the hanger into each functional groove, ensures the position accuracy of the workpiece in each process, thereby improving the quality stability of the phosphating treatment, a plurality of functional grooves are sequentially arranged, each process of the phosphating of the coupling workpiece is implemented, which can ensure that each process is carried out under specific conditions, is beneficial to improve the phosphating effect and product quality, the air suction system can collect the waste gas generated in the production process in time and convey it to the waste gas treatment device for treatment, reduces the pollution of waste gas to the environment, meets the environmental protection requirements.

[0020] By closing the production line, heat loss and waste gas leakage can be reduced, energy consumption can be reduced, energy-saving production can be realized, the setting of the feeding roller way and the discharging roller way makes the feeding and discharging process of the workpiece more smooth and efficient, further speeds up the production rhythm. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Fig. 1 A front view of the petroleum pipe coupling phosphating automatic production line provided by the present application;

[0023] Fig. 2 A top view of the petroleum pipe coupling phosphating automatic production line provided by the present application;

[0024] In the figure: 100, rack; 101, base; 102, column; 103, track; 104, workbench; 201, first ultrasonic degreasing tank; 202, second ultrasonic degreasing tank; 203, first water washing tank; 204, second water washing tank; 205, pickling tank; 206, third water washing tank; 207, fourth water washing tank; 208, surface adjusting tank; 209, first phosphating tank; 210, second phosphating tank; 211, third phosphating tank; 212, fifth water washing tank; 213, sixth water washing tank; 214, saponification tank; 301, feeding roller; 302, discharging roller; 401, first gantry crane; 402, second gantry crane; 500, hanger; 601, sliding wire traction device; 602, crane positioning system; 701, water and compressed air pipeline; 702, liquid receiving disc; 703, water storage tank; 801, PLC programmable controller; 802, touch screen computer; 901, air suction main pipe; 902, air suction point; 903, waste gas treatment device; 1000, production line closed system; 1101, heating interlayer; 1102, oil temperature machine; 1103, oil pump. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0026] The present application aims to provide a petroleum pipe coupling phosphating automatic production line and use method, to solve the problems existing in the prior art, simple structure, convenient to use, effectively improve the production efficiency, high degree of automation, effectively reduce the labor cost.

[0027] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0028] Embodiment one

[0029] The present embodiment provides a petroleum pipe coupling phosphating automatic production line, such as Figs. 1-2As shown, it comprises: a rack 100, a plurality of functional slots, a track 103, a gantry crane, a plurality of hangers 500, a sliding wire traction device 601, a crane positioning system 602, an upper feeding roller 301, a lower feeding roller 302, an air suction system, a production line sealing system 1000, and an electric control system. The rack 100 is used to be installed on the ground, and each functional slot is sequentially installed on the rack 100. Each functional slot is used to implement each process of coupling piece phosphating. The track 103 is arranged on the rack 100 and above each functional slot. The gantry crane can walk on the track 103 and keep the position after walking, and the gantry crane can be elongated or shortened in the vertical direction. The hanger 500 is used to be connected with the bottom end of the gantry crane. The hanger 500 is used to place the coupling piece and can be put into each functional slot by the gantry crane. The sliding wire traction device 601 is arranged on the track 103 to drive the gantry crane to move on the track 103. The crane positioning system 602 is arranged on the track 103 to correspond to each functional slot. The upper feeding roller 301 is arranged below one end of the track 103 to convey the hanger 500 loaded with the coupling piece to the position capable of being hoisted by the gantry crane. The lower feeding roller 302 is arranged below the other end of the track 103. The air suction system comprises an exhaust treatment device 903, an air suction main pipe 901 and a plurality of air suction points 902. The air suction main pipe 901 is arranged on the top of the rack 100. One end of the air suction main pipe 901 is connected with each air suction point 902 and communicates. The other end is used to be connected with the exhaust treatment device 903 and communicates. The production line sealing system 1000 is used to seal the top and both sides of the rack 100. The electric control system is signal connected with the gantry crane, the upper feeding roller 301, the lower feeding roller 302, the sliding wire traction device 601, the crane positioning system 602 and the air suction system. The coupling piece to be treated is put into the hanger by electric control and conveyed to the position capable of being connected by the gantry crane through the upper feeding roller. The gantry crane puts the hanger into each functional slot to complete the corresponding process.After the treatment is completed, the gantry crane hoists the hanger to the unloading roller way and transports away from the production line, the electric control system centrally controls the whole production line, can monitor and control the running state of each equipment in real time, improves the safety of the production process, the gantry crane cooperates with the track and the sliding wire traction device, can quickly and accurately move between each functional groove, realizes the automatic transfer of the coupling workpiece, greatly reduces the time and labor intensity of manual carrying, improves the production efficiency, the setting of the feeding roller way and the unloading roller way makes the feeding and unloading process of the workpiece more smooth and efficient, further speeds up the production rhythm, the crane positioning system can ensure that the gantry crane accurately puts the hanger into each functional groove, ensures the position accuracy of the workpiece in each process, thereby improves the quality stability of phosphating treatment, a plurality of functional grooves are sequentially arranged, each process of phosphating the coupling workpiece is carried out, can ensure that each process is carried out under specific conditions, which is beneficial to improve the phosphating effect and product quality, the air suction system can collect and transport the waste gas generated in the production process to the waste gas treatment device in time for treatment, reduces the pollution of waste gas to the environment, meets the environmental protection requirements.

[0030] By closing the production line, heat loss and waste gas leakage can be reduced, energy consumption can be reduced, and energy-saving production can be realized. The setting of the feeding roller way and the unloading roller way makes the feeding and unloading process of the workpiece more smooth and efficient, further speeds up the production rhythm.

[0031] In one preferred scheme of the embodiment, the rack 100 and the working platform 104 are the carriers of the crane, the hanging basket and the groove. The rack 100 is made of Q235 carbon steel material, H-shaped steel and steel welded into a steel structure shelf, so that the rack 100 forms a firm structure to ensure the smooth operation of the gantry crane. The column 102 and the cross beam are made of H-shaped steel, the column 102 is designed with longitudinal and scissors fork reinforced with channel steel or square tube, the track is composed of H-shaped steel and stainless steel square tube, the crane track and the column 102 and the cross beam adopt a detachable structure, which is welded and fixed after assembly, and has an elegant and reasonable appearance, which is convenient to clean. The working platform 104 is designed as a double-operation platform, the upper layer is a maintenance crane maintenance operation guardrail with safety rail, and the lower layer is a feeding or observation and manual operation platform and protective barrier. The operation platform is made of high-strength glass steel grating plate, which is anti-skid and anti-corrosion. The rack is made of Q235 carbon steel material, H-shaped steel and steel welded together, which ensures the stability of the whole production line and provides a solid foundation for the normal operation of the equipment. The double-operation platform design has an upper layer of maintenance crane maintenance operation guardrail with safety rail, which facilitates equipment maintenance and repair and improves safety. The lower layer is a feeding or observation and manual operation platform and protective barrier, which is convenient for operators to perform daily operations and monitoring, and improves production efficiency. The operation platform is made of high-strength glass steel grating plate, which is anti-skid and anti-corrosion, prolonging the service life of the equipment.

[0032] In one preferred scheme of the embodiment, the functional grooves are sequentially arranged as a first ultrasonic degreasing groove 201, a second ultrasonic degreasing groove 202, a first water washing groove 203, a second water washing groove 204, an acid washing groove 205, a third water washing groove 206, a fourth water washing groove 207, a surface adjusting groove 208, a first phosphating groove 209, a second phosphating groove 210, a third phosphating groove 211, a fifth water washing groove 212, a sixth water washing groove 213, and a saponification groove 214. The first ultrasonic degreasing groove 201 and the second ultrasonic degreasing groove 202 are identical in structure and are ultrasonic degreasing grooves. The ultrasonic degreasing groove comprises a first groove body, a first temperature measuring probe, a first electric heating element, and an ultrasonic cleaning element. The first groove body is of a double-layer structure with a filler layer arranged in the middle. The filler layer is filled with a heat preservation material. The first groove body is provided with a first liquid inlet pipeline, a first flow valve, a first sewage discharge pipeline, and a first sewage discharge valve. The first flow valve is arranged on the first liquid inlet pipeline. The first sewage discharge valve is arranged on the first sewage discharge pipeline. The first temperature measuring probe is arranged in the first groove body to measure the temperature in the first groove body. The first temperature measuring probe is signal connected with an electric control system. The electric heating element is arranged in the first groove body and signal connected with the electric control system. The ultrasonic cleaning element is arranged at the bottom of the first groove body.

[0033] In one preferred scheme of the embodiment, the first water washing groove 203, the second water washing groove 204, the third water washing groove 206, the fourth water washing groove 207, the fifth water washing groove 212, and the sixth water washing groove 213 are identical in structure. The first water washing groove 203 comprises a second groove body and a first air stirring element. The top of the second groove body is provided with a reverse flow structure to make the floating objects in the second groove body overflow. The first air stirring element is arranged at the bottom of the second groove body. The second groove body is provided with a second liquid inlet pipeline, a second sewage discharge pipeline, a second flow valve, and a second sewage discharge valve. The second sewage discharge valve is arranged on the second sewage discharge pipeline. The second flow valve is arranged on the second liquid inlet pipeline to adjust the flow of the second liquid inlet pipeline.

[0034] In one preferred scheme of the embodiment, the acid washing groove 205 comprises a third groove body, a second temperature measuring probe, and a second electric heating element. The third groove body is of a double-layer structure. The third groove body is made of a double-layer structure. The outer layer of the material is a SUS304 stainless steel plate. The inner layer is made of PE anti-corrosion plastic. The PE plastic is integrally formed by rotational molding. The third groove body is reinforced at the rim and the middle part. The outer groove surface is treated with glass steel for corrosion resistance. The second temperature measuring probe and the second electric heating element are arranged in the third groove body and signal connected with an electric control system. The third groove body is provided with a third liquid inlet pipeline, a third sewage discharge pipeline, a third flow valve, and a third sewage discharge valve. The third flow valve is arranged on the third liquid inlet pipeline. The third sewage discharge valve is arranged on the third sewage discharge pipeline. The oil temperature machine 1102 is provided with three heating units. One end of the oil temperature machine 1102 is connected with the phosphating groove interlayer inlet by an oil pump. The other end is directly connected with the phosphating groove interlayer outlet. The oil pump guides hot oil into the phosphating groove interlayer. The hot oil returns to the oil temperature machine 1102 from the other end to be heated in a cycle.

[0035] In one preferred scheme of the embodiment, the table conditioning tank 208 comprises a fourth tank body, a second air stirring device, a fourth temperature measuring probe and a fourth electric heating device. The fourth tank body is a double-layer structure with a filling layer arranged in the middle. The fourth tank body is made of stainless steel plate material, and the filling layer is filled with thermal insulation material. The second air stirring device is arranged at the bottom of the fourth tank body, and is provided with a manually controlled valve to adjust the stirring amount. The fourth temperature measuring probe and the fourth electric heating device are arranged in the fourth tank body and are signal connected with the electric control system. The fourth electric heating device is an SUS304 electric heating pipe, which is convenient for operation and maintenance and cleaning. The fourth tank body is provided with a fourth liquid inlet pipeline, a fourth blowdown pipeline, a fourth flow valve and a fourth blowdown valve. The fourth flow valve is arranged on the fourth liquid inlet pipeline, and the fourth blowdown valve is arranged on the fourth blowdown pipeline.

[0036] In one preferred scheme of the embodiment, the first phosphating tank 209, the second phosphating tank 210 and the third phosphating tank 211 have the same structure. The first phosphating tank 209 comprises a fifth tank body, a spraying system, a fifth temperature measuring probe and a heating system. The fifth tank body is a double-layer structure with a filling layer arranged in the middle. The fifth tank body is made of stainless steel plate material, and the filling layer is filled with thermal insulation material. The bottom of the fifth tank body is a conical structure, which is designed to facilitate sedimentation. There are three reinforcing ribs on the fifth tank body along the edge and the middle bottom, which are also made of stainless steel. The spraying system is arranged at the top of the fifth tank body. The heating system is used to heat the fifth tank body. The fifth temperature measuring probe and the fifth electric heating device are arranged in the fifth tank body and are signal connected with the electric control system. The fifth tank body is provided with a fifth liquid inlet pipeline, a fifth blowdown pipeline, a fifth flow valve and a fifth blowdown valve. The fifth flow valve is arranged on the fifth liquid inlet pipeline, and the fifth blowdown valve is arranged on the fifth blowdown pipeline.

[0037] In one preferred scheme of the embodiment, the heating system comprises an oil temperature machine 1102 and a delivery pipe oil pump 1103. The fifth tank body is provided with a heating sandwich layer 1101. The output end of the oil temperature machine 1102 is connected and communicated with the inlet of the heating sandwich layer 1101 through a first pipeline. The input end of the oil temperature machine 1102 is connected and communicated with the outlet of the heating sandwich layer 1101 through a second pipeline. The delivery pipe oil pump 1103 is arranged on the first pipeline.

[0038] In a preferred scheme of the embodiment, the saponification tank 214 comprises a sixth tank body, a sixth temperature measuring probe and a fifth electric heating element. The sixth tank body is a double-layer structure with a filling layer in the middle, made of stainless steel plate, and is provided with reinforcing ribs at the edge and the middle of the sixth tank body, also made of stainless steel. The filling layer is filled with thermal insulation material. The sixth temperature measuring probe and the fifth electric heating element are arranged in the sixth tank body and connected with the electric control system signal. The temperature control table is arranged beside the sixth tank body and the required control data is manually set. The fifth electric heating element is a SUS304 electric heating pipe, which is convenient for operation, maintenance and cleaning. The sixth tank body is provided with a sixth liquid inlet pipeline, a sixth blowdown pipeline, a sixth flow valve and a sixth blowdown valve. The sixth flow valve is arranged on the sixth liquid inlet pipeline and the sixth blowdown valve is arranged on the sixth blowdown pipeline.

[0039] The ultrasonic degreasing tank adopts a double-layer structure filled with thermal insulation material, and is provided with a temperature measuring probe, an electric heating element and an ultrasonic cleaning element, which can efficiently remove oil on the surface of the coupling workpiece to provide a good basis for subsequent processes. The water washing tank improves the cleaning effect and removes residual impurities through a reverse flow structure and an air stirring element to ensure the cleanliness of the workpiece surface. The pickling tank adopts a double-layer structure, with an outer layer made of stainless steel plate and an inner layer made of PE corrosion-resistant plastic, and is provided with a temperature measuring probe and an electric heating element, which can effectively remove rust and oxide layer on the surface of the workpiece. The surface conditioning tank is provided with an air stirring element, a temperature measuring probe and an electric heating element, which can adjust the surface state of the workpiece to improve the phosphating effect. The phosphating tank adopts a double-layer structure and is provided with a spraying system, a temperature measuring probe and a heating system, which can form a uniform and firm phosphating film on the surface of the workpiece. The saponification tank is provided with a temperature measuring probe and an electric heating element, which can perform saponification treatment on the workpiece after phosphating to improve the corrosion resistance of the workpiece.

[0040] In a preferred scheme of the embodiment, the upper feeding roller table 301 and the lower feeding roller table 302 have the same structure. The upper feeding roller table 301 is about 650 mm high and about 9500 mm long, and can bear 2000 kg per square meter. The upper feeding roller table 301 is designed in four sections and is driven by a speed reducer to convey at a speed of 6 m / min. The upper feeding roller table 301 realizes automatic accumulation and step-by-step movement. Four hangers 500 can be arranged simultaneously, mainly to buffer the feeding and discharging time beats. The roller way is driven by a frequency converter. The height and length of the upper feeding roller table and the lower feeding roller table are designed reasonably to facilitate cooperation with other equipment and improve production efficiency. The upper feeding roller table and the lower feeding roller table can bear a large weight and meet the transportation needs of petroleum pipe couplings, ensuring the continuity of production. The segmented design and speed reducer transmission conveying make the conveying more stable and reduce the damage to the workpieces. The adjustable speed and automatic accumulation and step-by-step movement can adapt to different production rhythms and improve the flexibility of the production line.

[0041] In one preferred scheme of the embodiment, the gantry crane includes a first gantry crane 401 and a second gantry crane 402, and the gantry crane is a high-rail middle column gantry single-arm crane, which is welded as a whole by using domestic high-quality Q235 steel and steel plate, and is subjected to sand blasting treatment and then coating for corrosion protection. The gantry crane has light weight, good rigidity, and corrosion resistance, and has an attractive appearance. The raw material of the frame 100 is first subjected to sand blasting rust removal treatment, and then is coated with a two-coat standard to ensure the coating quality.

[0042] The gantry crane is assembled by using platform assembly to ensure that the four horizontal traveling rollers of the gantry crane are in the same plane, and the flatness is ≤1 mm and the parallelism of the two traveling rollers is ≤1 mm. The traveling rollers of the crane are steel-core rollers, and the traveling speed of the crane is controlled by a frequency converter to realize slow starting and slow positioning. The horizontal running speed can be steplessly adjusted at 0-20 m / min, and the lifting speed can be steplessly adjusted at 0-18 m / min. The frequency conversion speed regulation is stable in operation.

[0043] The gantry crane adopts SEW reducer motor series products for lifting and traveling. The traveling positioning adopts gear and rack design, and the positioning accuracy is ±2 mm. At the same time, there is a soft start protection system, so that the crane is stable in upward and downward movement, traveling and workpiece lifting operation, and the damage to the V-shaped seat is minimized.

[0044] The gantry crane has multiple protection functions and intelligent judgment ability under the cooperation of the electric control. Over-travel, anti-collision, and stacked rod signaling devices are provided. Once a fault occurs, the control system immediately controls the crane to stop and gives an audible and visual warning. The audible and visual fault alarm signal during crane operation protects the safety of the operator.

[0045] The gantry crane is provided with a button sub-control box, which has an automatic and manual switching switch. When switched to the manual state, there are front, rear, up and down buttons. The crane completes the transposition, traveling and lifting of the hanging basket from each process groove from feeding to discharging. The running speed is controlled by a PLC program, and the frequency converter realizes the speed regulation function. The translation and lifting of the crane are controlled by a PLC step frequency control to achieve soft start, soft landing, soft start and soft stop control, improve the safety and reliability of operation, and use high-quality materials for welding and corrosion protection to make the gantry crane have good strength and corrosion resistance, and prolong the service life of the equipment. The steel-core rollers and the frequency converter control the traveling speed to realize slow starting and slow positioning, and the operation is stable, which reduces the impact on the workpiece and the equipment. The gear and rack positioning design has high positioning accuracy, which ensures that the gantry crane accurately puts the hanger into each functional groove to improve the production quality. Multiple protection functions such as over-travel, anti-collision, and stacked rod signaling devices, as well as the audible and visual fault alarm signal, improve the safety of the production process.

[0046] In one preferred embodiment of the present embodiment, the hanger 500 is made of SUS316L stainless steel profiled steel and net type material, and can be arranged in multiple layers to arrange the coupling workpieces. SUS316L stainless steel material has good corrosion resistance and strength, and can meet the use requirements of the production line. The coupling workpieces can be arranged in multiple layers to improve production efficiency and reduce equipment footprint.

[0047] In one preferred embodiment of the present embodiment, the traction and positioning system, the crane wire traction device 601, adopts a stainless steel wire suspension track and a movable pulley. The flat cable is fixed on the pulley, which is flexible and durable, and the wire is installed on the non-operating side. The power cable and signal cable are arranged separately to avoid signal interference. The crane positioning system 602 adopts a double-gauge bar code ruler positioning system. The system has real-time measurement positioning accuracy and memory function. The application of this system aims to ensure more reliable and stable operation of the equipment. The stainless steel wire suspension track and the movable pulley are flexible and durable, ensuring the stable operation of the gantry crane. The power cable and signal cable are arranged separately to avoid signal interference and improve the reliability of the equipment. The double-gauge bar code ruler positioning system has real-time measurement positioning accuracy and memory function, ensuring more reliable and stable operation of the equipment.

[0048] In one preferred embodiment of the present embodiment, the pipeline system 701 is also arranged and the tank bottom liquid receiving disc 702 is arranged. The inlet pipeline adopts the same stainless steel pipe material as the functional tank body. The inlet main pipe is a DN65 pipe, and each flow valve is a DN32 pipe valve. The water inlet pipe is installed and arranged 250 mm away from the tank bottom of the functional tank body. The functional tank body (degreasing, water washing after degreasing, phosphating, and water washing after phosphating) adopts a 4-way single-degree discharge pipeline design. The blowdown valves of the functional tank body are all configured with stainless steel valves. The blowdown pipelines after the outlet are all configured with PPR pipelines. The blowdown main pipe is a DN110 / PPR pipe, which is connected and composed in an orderly manner. The first air stirring member and the second air stirring member are arranged with stainless steel pipelines. The water inlet valves that need to be adjusted frequently are installed on the operation walkway. The other pipelines are all installed on the non-operation side. The pipelines of different properties are marked with color and flow direction. The opening and closing states of the valves are prompted with hanging tags. The production conditions and safety needs are met. The liquid receiving disc 702 is arranged below the functional tank body and the pipelines. The liquid receiving disc 702 is made of PPR material. All discharged liquids are collected in the liquid receiving disc 702 and connected with the water treatment system to meet the environmental protection requirements. The reasonable pipeline system arrangement meets the production needs and is convenient for operation and maintenance. The use of stainless steel pipes and stainless steel valves improves the corrosion resistance and reliability of the pipeline system. The PPR pipeline configuration and the liquid receiving disc setting meet the environmental protection requirements and collect the discharged liquids to connect with the water treatment system.

[0049] In a preferred scheme of the embodiment, the air suction main pipe 901 in the air suction system is arranged at the top of the production line rack 100, the main pipe is provided with three branch pipes, and the branch pipes are connected with air suction hoods. The air suction hoods are evenly distributed at the air suction points 902 at the top of the rack 100, air regulating valve devices are arranged on the branch pipes of the air suction hoods, the air volume can be adjusted, the branch pipes are made of PP pipes, the air suction main pipe is made of 10 mm PP flanges, which ensures good rigidity, the bottom of all air suction main pipes 901 is provided with a certain slope and a condensate return pipe, and the air outlet pipe is made of glass steel material and is reinforced by flanges. The lower side of the air port of all air hoods and the connecting part of the groove are provided with a leakage prevention baffle to solve the air leakage problem. The air suction main pipe and the air suction hood can collect waste gas generated in the production process in time and reduce the pollution of waste gas to the environment. The air regulating valve device can adjust the air volume to meet the waste gas treatment needs under different production conditions. The slope at the bottom of the air suction main pipe and the condensate return pipe design facilitate the return flow of condensate in the waste gas, and improve the waste gas treatment effect. The air outlet pipe made of glass steel material has good strength and corrosion resistance, ensuring the safe and reliable discharge of waste gas.

[0050] In a preferred scheme of the embodiment, the electric control system includes a PLC programmable controller and a touch screen computer. The electric control system adopts two-stage control of the touch screen and the PLC, and the production line should have a manual control function. The control system realizes online control of parameters, including current, voltage, alarm, temperature, time, display, cooling and heating processes, etc. A wireless data transmission module and a remote maintenance communication module are configured and installed. A historical and online dynamic database is established to realize production process state tracking, realize functions such as calling, compiling, increasing, modifying, querying, printing of production part process library, realize functions such as setting, modifying, displaying of process parameters, and liquid level control alarm of tank liquid, etc. The two-stage control of the touch screen and the PLC is convenient to operate and has high control precision, which can meet the automatic control needs of the production line. The manual control function is convenient for equipment debugging and maintenance. The online control of parameters realizes real-time monitoring and adjustment of the production process, improves production quality and efficiency. The wireless data transmission module and the remote maintenance communication module are convenient for remote monitoring and maintenance of the equipment, and improve the reliability and availability of the equipment.

[0051] Embodiment two

[0052] The embodiment also provides a use method of the automatic production line for petroleum pipe coupling phosphating according to any one of the above, including the following steps:

[0053] The rack 100 and the working walkway 104 are arranged at the bottom of the equipment, the rack 100 is directly supported on the ground, and the rack 100 comprises a base 101, a column 102 and a cross beam, the rack 100 is uniformly distributed with 14 functional grooves, and the functional grooves are installed on the rack 100 and arranged in front-to-back order as follows: a first ultrasonic degreasing groove 201, a second ultrasonic degreasing groove 202, a first water washing groove 203, a second water washing groove 204, an acid washing groove 205, a third water washing groove 206, a fourth water washing groove 207, a surface adjusting groove 208, a first phosphating groove 209, a second phosphating groove 210, a third phosphating groove 211, a fifth water washing groove 212, a sixth water washing groove 213 and a saponification groove 214. An upper feeding roller way 301 and a lower feeding roller way 302 are arranged at two ends of the phosphating production line respectively, the gantry cranes are a first two gantry cranes and a second gantry crane 402, and the gantry cranes walk on the track 103 of the rack 100. Meanwhile, a plurality of hangers 500 matched with the functional grooves are designed. The traction and positioning system comprises a crane sliding wire traction device 601 and a crane positioning system 602. An upper and lower water system is arranged, which meets the production needs and meets the environmental protection requirements, and comprises upper and lower water and compressed air pipelines, a liquid receiving disc 702 and a water storage tank 703. The electric control system comprises a PLC programmable controller 801 and a touch screen computer, and the running action state of the production line is dynamically displayed through the touch screen computer 802. An air suction system is arranged, the air suction main pipe 901 is arranged at the top of the rack 100, air suction points 902 and waste gas treatment devices 903 are arranged at the top of the rack 100. The production line closed system 1000 is used for closing the top of the shed and the two sides of the rack 100, and the production line adopts a closed structure design, so that the mist can be collected.

[0054] After the coupling workpiece is loaded into the hanger 500, the AGV trolley is placed on the upper feeding roller way 301, the upper feeding end is arranged with a transverse roller way, the roller way can bear 2000kg per square meter, the roller way is designed in four sections and is driven and conveyed by a speed reducer, the conveying speed is 6m / min, and the roller way realizes automatic accumulation and step movement. Four hangers 500 can be arranged at the same time, and the main function is to buffer the feeding and discharging time beats, and the roller way is driven by a frequency conversion.

[0055] The gantry crane has multiple protection functions and intelligent judgment ability under the cooperation of the electric control system. The crane is provided with overtravel, anti-collision, and stacked rod signaling devices. Once a fault occurs, the electric control system immediately controls the crane to stop, and sound and light warning signals are generated to protect the safety of the operator. The crane is provided with a button control box, which has an automatic and manual switching switch. When the switch is switched to the manual state, the front, rear, upper, and lower buttons are provided. The gantry crane completes the transposition, walking, and lifting of the hanger 500 from the loading to the unloading of each functional groove. The running speed is controlled by the PLC programmable controller 801, and the frequency converter realizes the variable speed function. The translation and lifting of the crane are controlled by the PLC frequency conversion, which realizes soft lifting and soft landing control, improves the safety and reliability of the operation.

[0056] The automatic operation is set. The first gantry crane 401 immerses the coupling workpiece into the first ultrasonic degreasing tank 201. The first groove is provided with a first temperature measuring probe, which is a PT100 temperature measuring probe. The temperature and time are automatically controlled by the communication control of the PLC and the temperature control table, and the electric heating mode is designed. The first groove is provided with an ultrasonic cleaning part to improve the cleaning effect. The degreasing work of the coupling workpiece is completed according to the set time. In order to ensure the degreasing effect, the coupling workpiece is further transferred to the second ultrasonic degreasing tank 202 for degreasing. At this time, the first gantry crane 401 will hoist another hanger 500 into the first ultrasonic degreasing tank 201 to realize the circulation operation. After the surface of the coupling is degreased, it enters the next process.

[0057] After the degreasing is completed, the first gantry crane 401 automatically transfers the coupling workpiece from the second ultrasonic degreasing tank 202 to the first water washing tank 203 and the second water washing tank 204 in sequence. The first water washing tank 203 and the second water washing tank 204 have the same structure and include a second groove and a first air stirring part. In order to ensure the cleaning effect, the second groove is provided with a first air stirring part, and a reverse flow structure is designed at the top of the second groove. After the reverse flow structure is designed at the top of the second groove, the overflow of the rear tank is driven to the overflow port to overflow and walk away, improving the cleanliness of the water quality. The water flow is adjusted through the second flow valve, and the quantitative control is realized through the flow meter detection. When the water inflow value is higher or lower than the set value, the equipment alarms, which is convenient for operation and maintenance and cleaning. The second liquid inlet pipeline is a DN32 stainless steel pipeline, the second sewage pipeline is a DN50 / stainless steel pipeline, the second sewage valve is a SUS304 stainless steel ball valve, and the bottom of the second groove is inclined.

[0058] Then the coupling workpiece in the second water washing tank 204 is transferred to the pickling tank 205, the second temperature measuring probe of the pickling tank 205 is a PT100 temperature measuring probe, automatic temperature control and automatic timing are realized through PLC and temperature control table communication control, after the pickling time, the first gantry crane 401 automatically transfers the hanger 500 loaded with the coupling workpiece to the third water washing tank 206 and the fourth water washing tank 207, after water washing, it is poured into the table adjusting tank 208, the bottom of the fourth tank body in the table adjusting tank 208 is provided with a second air stirring piece, a manual control valve is arranged to facilitate adjusting the stirring amount.

[0059] The above is one operation cycle of the first gantry crane 401, after one operation cycle, the coupling workpiece in each tank is transferred in turn according to the previous process, and the cycle is repeated.

[0060] After the table adjusting is completed, the second gantry crane 402 transfers the coupling workpiece to the first phosphating tank 209, the second phosphating tank 210 and the third phosphating tank 211, the first phosphating tank 209, the second phosphating tank 210 and the third phosphating tank 211 have the same structure, the first phosphating tank 209 comprises a fifth tank body, a spraying system, a fifth temperature measuring probe and a heating system, the fifth tank body is provided with a fifth temperature measuring probe, the fifth temperature measuring probe is a PT100 temperature measuring probe, automatic temperature control and automatic time detection are realized through PLC and temperature module control. The top tank opening of the fifth tank body is provided with a spraying system, which solves the problem that the coupling workpiece is not easy to clean after being dried on the surface when it is taken out of the tank, and the system uses tap water spraying, which can also supplement water vapor evaporation.

[0061] After phosphating, the second gantry crane 402 transfers the coupling workpiece to the fifth water washing tank 212 and the sixth water washing tank 213, and then returns to the table adjusting tank 208, the next hanger 500 is poured into the first phosphating tank 209, and then returns to the sixth water washing tank 213, and the coupling workpiece is poured into the saponification tank 214, the saponification tank 214 comprises a sixth tank body, a sixth temperature measuring probe and a fifth electric heating piece, the sixth temperature measuring probe is a PT100 temperature measuring probe, automatic temperature control and automatic time detection are realized through PLC and temperature control table communication control.

[0062] After saponification, the second gantry crane 402 hoists out the coupling workpiece and places it on the discharging roller 302, at this time, one operation cycle of the second gantry crane 402 is completed, the coupling workpiece in each tank is transferred in turn according to the previous process, and the cycle is repeated.

[0063] The coupling workpiece is placed on the unloading roller way 302, the unloading roller way 302 and the loading roller way 301 are same, the transverse roller way is arranged, the roller way can bear 2000kg per square meter, the roller way is designed in four sections, transmission is realized by a speed reducer, the conveying speed is 6m / min, the roller way realizes automatic accumulation and step moving. Four baskets can be arranged at the same time, the main function is to buffer the unloading time beat, the roller way adopts frequency conversion driving. Then the AGV trolley is transferred to leave the phosphating production line.

[0064] The equipment is reasonably arranged, and each component cooperates to realize the automatic phosphating treatment of the petroleum pipe coupling, and the production efficiency is improved.

[0065] The design of the loading and unloading roller way facilitates the transportation of the workpiece, buffers the loading and unloading time beat, and improves the flexibility of the production line.

[0066] The multiple protection functions and intelligent judgment ability of the gantry crane improve the safety of the production process.

[0067] The sequential treatment of each functional groove ensures the phosphating effect and improves the product quality.

[0068] The whole production process adopts automatic control, reduces manual intervention and reduces labor intensity.

[0069] The principle and implementation mode of the present application are described by applying specific examples, and the above embodiment is only used to help understand the method and core idea of the present application; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In conclusion, the content of the specification should not be understood as the limitation of the present application.

Claims

1. An automatic production line for phosphating petroleum pipe couplings, characterized in that: The utility model relates to a phosphating production line, including: a rack for mounting on the ground, a plurality of functional grooves, each of which is sequentially mounted on the rack, and each of which is used to implement a respective process of coupling piece phosphating, a track provided on the rack above each of the functional grooves, a gantry crane capable of walking on the track and maintaining the position after walking, and capable of being elongated or shortened in the vertical direction, a plurality of hangers for hanging connection with the bottom end of the gantry crane, which are used to place coupling pieces and can be put into each of the functional grooves by the gantry crane, a sliding wire traction device provided on the track to move the gantry crane on the track, a crane positioning system provided on the track to correspond to each of the functional grooves, an upper roller bed provided below one end of the track to convey the hangers loaded with the coupling pieces to a position capable of being hoisted by the gantry crane, a lower roller bed provided below the other end of the track, an air suction system including a waste gas treatment device, an air suction main pipe and a plurality of air suction points, the air suction main pipe being provided on the top of the rack, one end of the air suction main pipe being connected and communicated with each of the air suction points, and the other end being used to be connected and communicated with the waste gas treatment device, a production line sealing system for sealing the top and both sides of the rack, an electric control system connected with the gantry crane, the upper roller bed, the lower roller bed, the sliding wire traction device, the crane positioning system and the air suction system, the first, second and third phosphating grooves have the same structure, the first phosphating groove includes a fifth groove, a spraying system, a fifth temperature measuring probe and a heating system, the fifth groove is a double-layer structure with a filling layer in the middle, the filling layer is filled with thermal insulation material, the bottom of the fifth groove is a conical structure, the spraying system is provided on the top of the fifth groove, the heating system is used to heat the fifth groove, the fifth temperature measuring probe and the fifth electric heating element are provided in the fifth groove and connected with the electric control system, the fifth groove is provided with a fifth liquid inlet pipeline, a fifth sewage pipeline, a fifth flow valve and a fifth sewage valve, the fifth flow valve is provided on the fifth liquid inlet pipeline, and the fifth sewage valve is provided on the fifth sewage pipeline, the heating system includes an oil temperature machine and a delivery pipe oil pump, the fifth groove is provided with a heating sandwich layer, the output end of the oil temperature machine is connected and communicated with the inlet of the heating sandwich layer through a first pipeline, the input end of the oil temperature machine is connected and communicated with the outlet of the heating sandwich layer through a second pipeline, and the delivery pipe oil pump is provided on the first pipeline.

2. The automatic production line for phosphating petroleum pipe couplings according to claim 1, characterized in that: The first ultrasonic degreasing tank and the second ultrasonic degreasing tank are identical in structure and are ultrasonic degreasing tanks, the ultrasonic degreasing tank comprises a first tank body, a first temperature measuring probe, a first electric heating element and an ultrasonic cleaning element, the first tank body is a double-layer structure with a filling layer arranged in the middle, the filling layer is filled with heat preservation material, the first tank body is provided with a first liquid inlet pipeline, a first flow valve, a first sewage pipeline and a first sewage valve, the first flow valve is arranged on the first liquid inlet pipeline, the first sewage valve is arranged on the first sewage pipeline, the first temperature measuring probe is arranged in the first tank body to measure the temperature in the first tank body, and the first temperature measuring probe is signal connected with the electric control system, the electric heating element is arranged in the first tank body and signal connected with the electric control system, and the ultrasonic cleaning element is arranged at the bottom of the first tank body.

3. The automatic production line for phosphating petroleum pipe couplings according to claim 2, characterized in that: The first water washing tank, the second water washing tank, the third water washing tank, the fourth water washing tank, the fifth water washing tank and the sixth water washing tank are identical in structure, the first water washing tank comprises a second tank body and a first air stirring element, the top of the second tank body is provided with a reverse flow structure to make the floating objects in the second tank body overflow, the first air stirring element is arranged at the bottom of the second tank body, the second tank body is provided with a second liquid inlet pipeline, a second sewage pipeline, a second flow valve and a second sewage valve, the second sewage valve is arranged on the second sewage pipeline, and the second flow valve is arranged on the second liquid inlet pipeline to adjust the flow of the second liquid inlet pipeline.

4. The automatic production line for phosphating petroleum pipe couplings according to claim 3, characterized in that: The pickling tank comprises a third tank body, a second temperature measuring probe and a second electric heating element, the third tank body is a double-layer structure, the inner layer of the third tank body is made of PE anti-corrosion plastic, the second temperature measuring probe and the second electric heating element are arranged in the third tank body and signal connected with the electric control system, the third tank body is provided with a third liquid inlet pipeline, a third sewage pipeline, a third flow valve and a third sewage valve, the third flow valve is arranged on the third liquid inlet pipeline, and the third sewage valve is arranged on the third sewage pipeline.

5. The automatic production line for phosphating petroleum pipe couplings according to claim 4, characterized in that: The surface adjusting tank comprises a fourth tank body, a second air stirring element, a fourth temperature measuring probe and a fourth electric heating element, the fourth tank body is a double-layer structure with a filling layer arranged in the middle, the filling layer is filled with heat preservation material, the second air stirring element is arranged at the bottom of the fourth tank body, and the second air stirring element is provided with a manually controlled valve to adjust the stirring amount, the fourth temperature measuring probe and the fourth electric heating element are arranged in the fourth tank body and signal connected with the electric control system, the fourth tank body is provided with a fourth liquid inlet pipeline, a fourth sewage pipeline, a fourth flow valve and a fourth sewage valve, the fourth flow valve is arranged on the fourth liquid inlet pipeline, and the fourth sewage valve is arranged on the fourth sewage pipeline.

6. The automatic production line for phosphating petroleum pipe couplings according to claim 5, characterized in that: The saponification tank comprises a sixth tank body, a sixth temperature measuring probe and a fifth electric heating element, the sixth tank body is a double-layer structure with a filling layer arranged in the middle, the filling layer is filled with heat preservation material, the sixth temperature measuring probe and the fifth electric heating element are arranged in the sixth tank body and connected with the electric control system, the sixth tank body is provided with a sixth liquid inlet pipeline, a sixth blowdown pipeline, a sixth flow valve and a sixth blowdown valve, the sixth flow valve is arranged on the sixth liquid inlet pipeline, and the sixth blowdown valve is arranged on the sixth blowdown pipeline.

7. The automatic production line for phosphating petroleum pipe couplings according to claim 6, characterized in that: A tank bottom liquid receiving disc is further arranged below each functional tank body to collect the liquid discharged from each functional tank body.

8. A method of using the automatic production line for phosphating petroleum pipe couplings according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: The coupling workpiece to be processed is placed in a hanger and conveyed to a position capable of being hung by the gantry crane through a feeding roller way; The gantry crane sequentially places the hanger into each functional tank body to complete corresponding process treatment; After the treatment is completed, the gantry crane lifts the hanger to a discharging roller way to transfer and leave the production line.

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