Automatic anti-corrosion oil coating device for interior of circular hollow terminal

Abstract

The invention relates to the technical field of artificial intelligence, in particular to an automatic anti-corrosion oil coating device for the interior of a circular hollow terminal. Comprising a conveying belt and a rack, the oiling structure comprises a mounting frame, a spray head is mounted at the bottom of the mounting frame, a spiral flow guide groove is formed in an inner cavity of the spray head, an anti-blocking structure is arranged at the oil spraying end of the spray head, and an adjusting structure for adjusting the angle of the spray head is arranged at the other end of the spray head. An intelligent control system for controlling the nozzles to spray oil is arranged in the rack; by arranging the adjusting structure for adjusting the angles of the sprayers, the inward inclination angles of the sprayers can be adjusted within the range of 15-30 degrees, the sprayers can be flexibly adjusted according to the depth and the shape of the inner wall of the terminal, the three sprayers are evenly arranged at 120 degrees, it is ensured that spraying and covering are even, and the device can adapt to the inner walls of the terminals with different depths and shapes; the problems that the inner wall of the terminal is not uniformly coated, and the coating adhesive force is influenced by coating omission are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery manufacturing equipment, and particularly relates to an automatic anti-corrosion oil coating device for the inside of a circular hollow terminal. Background Art

[0002] After the battery is assembled, formation charging is required. During the formation charging process, electrolyte (dilute sulfuric acid) needs to be added. Since sulfuric acid is highly corrosive during formation charging, in order to prevent the terminals from being corroded during the formation process, it is necessary to coat the terminals with anti-corrosion oil before adding acid.

[0003] The prior art mainly adopts the method of manual brushing, which has the following problems: First, there are blind spots in manual brushing: the internal structure of the terminal is cylindrical and hollow, and the inner wall is unevenly coated; the depth of the inner cavity of the terminal is relatively deep, and it is difficult for manual operation to completely coat it; there are dead corners on the inner wall, which are difficult for manual operation to reach, and it is impossible to ensure the uniformity of the coating thickness. Second, manual coating affects production efficiency: the manual brushing speed is slow, which limits the subsequent acid addition process. The brushing quality is unstable, and it needs to be repeatedly applied. Acid addition can only be carried out after waiting for the oil coating process to be completed. Uneven brushing requires rework, wasting time. Third, the anti-corrosion effect of manual coating is not good enough: uneven coating leads to insufficient anti-corrosion in some areas, and the dead corner areas inside the terminal are easily missed. The inconsistent coating thickness affects the anti-corrosion effect, and corrosion is likely to occur during the formation process.

[0004] After retrieval, in the prior art, the patent application number CN110624719B4 discloses a steel pipe anti-corrosion paint spraying device, which includes a paint coating tank. An inlet isolation door and an outlet isolation door are respectively arranged on both sides of the paint coating tank. A steel pipe conveying roller path, a U-shaped spray ring and an annular air knife are arranged inside the paint coating tank. Both the inlet isolation door and the outlet isolation door are composed of double-layer steel plates with circular holes cut in the middle for the steel pipe to enter and exit, and a PVC film that can be in contact and sealed with the incoming and outgoing steel pipes is clamped between the two layers of steel plates; the U-shaped spray ring is arranged behind the inlet, and includes a spray pipe arranged in an inverted U shape, an oil inlet pipe communicated with the spray pipe, and a plurality of nozzles with adjustable angles arranged on the spray pipe; the annular air knife is arranged in front of the outlet and is connected with an air inlet pipe.

[0005] This device enables the outer surface of the steel pipe to be evenly sprayed by setting adjustable nozzles outside the U-shaped pipe, and removes the excess anti-corrosion paint on the surface of the steel pipe through compressed air, so as to ensure the uniformity of the anti-corrosion paint spraying on the surface of the steel pipe, without dripping, and improve the appearance quality of the steel pipe body. However, when spraying inside the pipe, the depth of the inner cavity of the terminal is relatively deep, and it is difficult to completely coat it; there are easily dead corners on the inner wall, which affect the uniformity of the coating thickness and the anti-corrosion effect, resulting in corrosion being likely to occur during the formation process. Summary of the Invention

[0006] In view of the above problems, the present invention provides an automatic anti-corrosion oiling device for the inside of a circular hollow terminal. It includes a conveyor belt and a frame. The conveyor belt is installed above the frame. A positioning structure for positioning the terminal is fixed above the conveyor belt by screws. An oiling structure for oiling the terminal and a lifting structure for driving the lifting of the oiling structure are arranged above the frame;

[0007] The oiling structure includes a mounting frame. A nozzle is installed at the bottom of the mounting frame. A spiral diversion groove is provided in the inner cavity of the nozzle. An anti-blocking structure is arranged at the oil spraying end of the nozzle. An adjusting structure for adjusting the angle of the nozzle is arranged at the other end of the nozzle. An intelligent control system for controlling the oil spraying of the nozzle is arranged in the frame;

[0008] The anti-blocking structure includes an anti-blocking plate. A rotation limiting structure for limiting the anti-blocking plate is arranged in the inner cavity of the nozzle. The intelligent control system includes a PLC control module, a pressure control module and an execution module. The PLC control module is electrically connected to both the pressure control module and the execution module.

[0009] Furthermore, the adjusting structure includes a U-shaped seat. A rotating shaft is fixed on the outer wall of the nozzle. The rotating shaft penetrates through the U-shaped seat and is rotatably connected to the U-shaped seat. Nuts are threadedly connected to the outer walls at both ends of the rotating shaft. One side of the nut is in close contact with the outer wall of the U-shaped seat. The anti-blocking plate is arranged at the end of the nozzle far from the rotating shaft.

[0010] Furthermore, the PLC control module includes a central processing unit (CPU), an input / output unit, a power supply unit and a communication unit. The central processing unit (CPU) is electrically connected to the input / output unit, the power supply unit and the communication unit.

[0011] Furthermore, the pressure control module includes a signal conditioning circuit, an analog input circuit, a pressure feedback control algorithm, a data recording and storage unit and a feedback unit. The signal conditioning circuit is electrically connected to the analog input circuit, the pressure feedback control algorithm, the data recording and storage unit and the feedback unit;

[0012] The feedback unit includes a pressure sensor, a human-machine interface and an alarm component. The human-machine interface is electrically connected to the alarm component.

[0013] Furthermore, the execution module includes a signal receiving unit and an execution unit. The execution unit includes an electromagnetic valve and an oil supply pump. The oil inlet end of the nozzle is fixedly connected to the oil supply pump through a nozzle oil supply pipeline. The electromagnetic valve is installed on the oil supply pipeline of the nozzle.

[0014] Furthermore, micropores are provided in the anti-blocking plate. The micropores penetrate the upper surface and the lower surface of the anti-blocking plate. The micropores are arranged in an equidistant array.

[0015] Further, there are three groups of the nozzles, and the three groups of nozzles are arranged in a circumferential array. The inclination of the nozzles with respect to the vertical line is in the range of 15-30°.

[0016] Further, the positioning structure includes a mounting table, the mounting table is fixedly connected to the conveyor belt by screws, an electric gripper for clamping the outer wall of the terminal is installed above the mounting table, the electric gripper is electrically connected to the PLC control module, and there are four groups of the mounting tables, and the four groups of mounting tables are arranged in a linear array.

[0017] Further, the rotation limiting structure includes a positioning shaft and a positioning pin. One end of the positioning shaft is fixedly connected to the outer wall of the anti-blocking plate. A relief groove is formed in the inner cavity of the nozzle. The positioning shaft is rotatably connected in the relief groove. A positioning hole is formed in the outer wall of the positioning shaft. One end of the positioning pin penetrates the outer wall of the nozzle and is inserted into the positioning hole. The other end of the positioning pin is threadedly connected with a positioning screw, and the upper surface of the positioning screw is in tight contact with the outer wall of the nozzle.

[0018] Further, the lifting structure includes a cylinder, a guide rod and a positioning sensor. The cylinder and the guide rod are both fixedly connected to the frame by screws. The telescopic end of the cylinder is fixed with a lifting plate. An oil spraying frame is fixed on one side of the lifting plate. The guide rod penetrates the lifting plate and is slidably connected to the lifting plate. The mounting frame and the positioning sensor are both fixed at the bottom of the oil spraying frame.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. By setting an adjusting structure for adjusting the angle of the nozzle, the inner inclination angle of the nozzle can be adjusted within the range of 15-30°. The nozzle can be flexibly adjusted according to the depth and shape of the inner wall of the terminal. The three nozzles are evenly arranged at 120°, ensuring uniform spraying coverage, enabling the device to adapt to the inner walls of terminals with different depths and shapes, and overcoming the problems of uneven coating on the inner wall of the terminal and coating omission affecting the coating adhesion.

[0021] 2. By arranging a spiral diversion groove and a multi-stage microporous array inside the nozzle, a vortex effect can be generated, and the anti-corrosion oil is sprayed in a vortex flow to ensure uniform spraying on the inner wall of the terminal, enhancing the uniformity of the coating and avoiding omission or repeated coating in the dead corner area.

[0022] 3. By setting an anti-blocking structure, the anti-corrosion oil can be prevented from blocking the nozzle due to high viscosity or impurities during the spraying process, making the spraying process smooth. At the same time, the design of the spiral diversion groove can guide the anti-corrosion oil to form a vortex inside the nozzle, reducing the retention of the oil liquid inside the nozzle, preventing the oil liquid from solidifying, and also reducing the probability of blockage, thereby reducing the equipment maintenance frequency, improving the reliability and stability of the equipment, and avoiding the shutdown problem caused by nozzle blockage.

[0023] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention can be realized and attained by the structure pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following briefly introduces the accompanying drawings required for describing the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 Shows a system block diagram according to an embodiment of the present invention;

[0026] Figure 2 Shows an overall machine structure diagram according to an embodiment of the present invention;

[0027] Figure 3 Shows a positioning structure diagram for terminal positioning according to an embodiment of the present invention;

[0028] Figure 4 Shows an arrangement diagram of three spray heads according to an embodiment of the present invention;

[0029] Figure 5 Shows a schematic structural diagram of a spiral diversion groove inside a spray head according to an embodiment of the present invention;

[0030] Figure 6 Shows a schematic structural diagram of a spray head adjustment structure according to an embodiment of the present invention;

[0031] Figure 7 Shows a schematic structural diagram of an anti-clogging structure according to an embodiment of the present invention;

[0032] Figure 8 Shows a relative position diagram of a terminal to be sprayed with oil and a spray head according to an embodiment of the present invention.

[0033] In the figure: 1, conveyor belt; 2, frame; 3, positioning structure; 4, oiling structure; 401, mounting frame; 402, nozzle; 403, spiral flow guiding groove; 5, anti-blocking structure; 6, adjusting structure; 7, lifting structure; 501, anti-blocking plate; 502, rotation limiting structure; 601, U-shaped seat; 602, rotating shaft; 603, nut; 503, micro-holes; 301, mounting table; 302, electric gripper; 5021, positioning shaft; 5022, positioning pin; 5023, relief groove; 5024, positioning hole; 5025, positioning screw; 701, cylinder; 702, guide rod; 703, lifting plate; 704, oil spraying frame; 8, positioning sensor. Detailed implementation manners

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figure 1-8 , the present invention provides a technical solution:

[0036] The embodiment of the present invention provides an automatic anti-corrosion oiling device for the inside of circular hollow terminals. It includes a conveyor belt 1 and a frame 2. The conveyor belt 1 is installed above the frame 2. Above the conveyor belt 1, a positioning structure 3 for positioning the terminals is fixed by screws. Above the frame 2, an oiling structure 4 for oiling the terminals and a lifting structure 7 for driving the oiling structure 4 to lift are provided;

[0037] The terminals are conveyed to the spraying station through the conveyor belt 1. The frame 2 fixes the nozzle 402 and the intelligent control system to ensure the stability of the spraying process. By setting the lifting structure 7, the nozzle 402 can move up and down to facilitate the spraying operation.

[0038] The oiling structure 4 includes a mounting frame 401. At the bottom of the mounting frame 401, a nozzle 402 is installed. Inside the nozzle 402, a spiral flow guiding groove 403 is provided. At the oil spraying end of the nozzle 402, an anti-blocking structure 5 is provided. At the other end of the nozzle 402, an adjusting structure 6 for adjusting the angle of the nozzle 402 is provided. Inside the frame 2, an intelligent control system for controlling the oil spraying of the nozzle 402 is provided;

[0039] During the spraying process, the anticorrosive oil may cause the nozzle of the spray head 402 to become blocked due to its high viscosity or impurities. The anti-blocking structure 5 can effectively prevent this situation from occurring and ensure a smooth spraying process. The anti-blocking structure 5 can reduce the equipment maintenance frequency, improve the reliability and stability of the equipment, avoid downtime problems caused by nozzle blockage, extend the service life of the nozzle by preventing blockage, reduce the replacement frequency, and lower the maintenance cost.

[0040] Inside the spray head 402, a spiral diversion groove 403 is designed to guide the flow of the anticorrosive oil, reduce the retention of the oil inside the nozzle, and prevent the oil from solidifying or impurities from accumulating.

[0041] The intelligent control system monitors parameters such as the spraying pressure and the angle of the spray head 402 in real time through pressure sensors, and controls and adjusts the spraying process through a feedback unit to ensure the coating quality.

[0042] The anti-blocking structure 5 includes an anti-blocking plate 501. A rotational limiting structure 502 for limiting the anti-blocking plate 501 is provided inside the cavity of the spray head 402. The intelligent control system includes a PLC control module, a pressure control module, and an execution module. The PLC control module is electrically connected to both the pressure control module and the execution module.

[0043] Each module is connected by signals to ensure the real-time and accurate transmission of information.

[0044] The PLC control module can monitor the pressure of each spray head 402 in real time. Through pressure synchronization control, it ensures that the spraying pressure of each spray head 402 is consistent, avoiding uneven coating thickness. The nozzle of the spray head 402 is designed with an anti-blocking structure 5 to ensure that the nozzle will not be blocked due to the solidification of the anticorrosive oil or impurities during long-term use.

[0045] The adjustment structure 6 includes a U-shaped seat 601. A rotating shaft 602 is fixed to the outer wall of the spray head 402. The rotating shaft 602 passes through the U-shaped seat 601 and is rotatably connected to the U-shaped seat 601. Threaded nuts 603 are screwed onto the outer walls at both ends of the rotating shaft 602. One side of the threaded nut 603 is in close contact with the outer wall of the U-shaped seat 601. The anti-blocking plate 501 is provided at one end of the spray head 402 away from the rotating shaft 602.

[0046] The PLC control module includes a central processing unit (CPU), an input / output unit, a power supply unit, and a communication unit. The central processing unit (CPU) is electrically connected to the input / output unit, the power supply unit, and the communication unit.

[0047] The PLC control module is responsible for executing the control program, processing input signals and outputting control instructions. According to the preset program and real-time feedback data, it controls all aspects of the spraying process. The input unit receives signals from devices such as pressure sensors, buttons, and switches, and the output unit sends control signals to the actuators (such as motors, solenoid valves, spray heads 402, etc.) to control the angle of the spray head 402, spraying pressure, speed of the conveyor belt 1, etc.

[0048] The pressure control module includes a signal conditioning circuit, an analog input circuit, a pressure feedback control algorithm, a data recording and storage unit, and a feedback unit. The signal conditioning circuit is electrically connected to the analog input circuit, the pressure feedback control algorithm, the data recording and storage unit, and the feedback unit.

[0049] The feedback unit includes a pressure sensor, a human-machine interface, and an alarm component. The human-machine interface is electrically connected to the alarm component. The pressure feedback control algorithm running inside the PLC is responsible for automatically adjusting the pressure of the spraying system according to the real-time pressure data to ensure that the pressure of each spray head 402 is consistent. If the pressure of a certain spray head 402 deviates from the set value, the control algorithm will automatically adjust the pressure of the oil supply pump or the opening of the spray head 402 to ensure that the pressure returns to the normal range and avoid uneven coating thickness.

[0050] The execution module includes a signal receiving unit and an execution unit. The execution unit includes a solenoid valve and an oil supply pump. The oil inlet end of the spray head 402 is fixedly connected to the oil supply pump through the spray head 402 oil supply pipeline, and the solenoid valve is installed on the oil supply pipeline of the spray head 402.

[0051] The anti-blocking plate 501 is provided with micro-holes 503. The micro-holes 503 penetrate the upper surface and the lower surface of the anti-blocking plate 501, and the micro-holes 503 are arranged in an equidistant array.

[0052] A multi-stage micro-hole 503 array is designed at the nozzle outlet of the spray head 402. The size and distribution of these micro-holes 503 are optimized to prevent large particle impurities from entering the spray head 402 and ensure that the anticorrosive oil is sprayed out in a fine mist.

[0053] The built-in spiral diversion groove 403 and the multi-stage micro-hole 503 array can generate a vortex effect to ensure that the anticorrosive oil is sprayed out in a fine mist, avoid too thick or too thin coating, and ensure uniform spraying coverage.

[0054] Three groups of the spray heads 402 are provided, and the three groups of the spray heads 402 are arranged in a circumferential array. The spray heads 402 are inclined within a range of 15 - 30° with respect to the vertical line.

[0055] Three nozzles 402 are evenly arranged at 120°, ensuring a uniform spraying coverage. The inward inclination angle of the nozzle 402 is adjustable from 15° to 30°. The specific angle depends on the depth and shape of the inner cavity of the terminal. By manually rotating the fixing device of the nozzle 402 to change the inclination angle of the nozzle 402, the operator can manually adjust the angle of the nozzle 402. A smaller inward inclination angle (such as 15°) is suitable for a shallower inner cavity of the terminal, with a narrower spraying range, suitable for fine spraying. A larger inward inclination angle (such as 30°) is suitable for a deeper inner cavity of the terminal, with a wider spraying range, capable of covering a deeper area to ensure the best spraying effect. The combination of the inward inclination angle and the design of the spiral diversion groove 403 can evenly distribute the anticorrosive oil on the inner wall of the terminal, ensuring a consistent coating thickness.

[0056] The positioning structure 3 includes a mounting table 301. The mounting table 301 is fixedly connected to the conveyor belt 1 by screws. An electric gripper 302 for clamping the outer wall of the terminal is installed above the mounting table 301. The electric gripper 302 is electrically connected to the PLC control module. There are four groups of the mounting tables 301, and the four groups of the mounting tables 301 are arranged in a linear array.

[0057] The device is designed as a four-station parallel operation structure, capable of processing multiple terminals simultaneously to improve production efficiency. The round tube of the terminal is clamped in the electric gripper 302 and moves to the oil spraying position along with the conveyor belt 1.

[0058] The rotation limiting structure 502 includes a positioning shaft 5021 and a positioning pin 5022. One end of the positioning shaft 5021 is fixedly connected to the outer wall of the anti-blocking plate 501. A relief groove 5023 is opened in the inner cavity of the nozzle 402. The positioning shaft 5021 is rotatably connected in the relief groove 5023. A positioning hole 5024 is opened on the outer wall of the positioning shaft 5021. One end of the positioning pin 5022 penetrates the outer wall of the nozzle 402 and is inserted into the positioning hole 5024. The other end of the positioning pin 5022 is threadedly connected with a positioning screw 5025, and the upper surface of the positioning screw 5025 is in tight contact with the outer wall of the nozzle 402.

[0059] By setting the rotation structure, when the positioning pin 5022 is pulled out, the anti-blocking plate 501 can rotate to turn the anti-blocking plate 501 over, facilitating the operator to scrape off the oil stain on one side of the anti-blocking plate 501.

[0060] The lifting structure 7 includes a cylinder 701, a guide rod 702, and a positioning sensor 8. The cylinder 701 and the guide rod 702 are both fixedly connected to the frame 2 by screws. The telescopic end of the cylinder 701 is fixed with a lifting plate 703. An oil spraying frame 704 is fixed on one side of the lifting plate 703. The guide rod 702 penetrates the lifting plate 703 and is slidably connected to the lifting plate 703. The mounting frame 401 and the positioning sensor 8 are both fixed at the bottom of the oil spraying frame 704.

[0061] During use, the terminal is clamped within the electric gripper 302 and conveyed by the conveyor belt 1. The positioning sensor 8 ensures that each terminal can accurately reach the spraying position. The positioning sensor 8 is electrically connected to the PLC control module. When the positioning sensor 8 senses that the material has moved to the spraying position below the nozzle 402, the cylinder 701 drives the lifting plate 703 and the connecting plate to move downward, inserting the nozzle 402 into the circular tube of the terminal, and the pressure spraying of the oil supply pump is controlled by the PLC control module. The pressure feedback control algorithm running inside the PLC is responsible for automatically adjusting the pressure of the spraying system according to the real-time pressure data to ensure that the pressure of each nozzle 402 remains consistent. If the pressure of a certain nozzle 402 deviates from the set value, the control algorithm will automatically adjust the pressure of the oil supply pump or the opening degree of the nozzle 402 to ensure that the pressure returns to the normal range and avoid uneven coating thickness; after the positioning pin 5022 is withdrawn, the anti-blocking plate 501 can rotate to turn the anti-blocking plate 501 over, facilitating the operator to scrape off the oil stain on one side of the anti-blocking plate 501 and reducing the probability of blockage.

[0062] The included angle of the nozzle 402 of the present invention is adjustable within the range of 15 - 30°, and the nozzle 402 can be flexibly adjusted according to the depth and shape of the inner wall of the terminal. A spiral diversion groove 403 and a multi-stage micropore 503 array are provided inside the nozzle 402, which can generate a vortex effect, and the anticorrosive oil is sprayed out in a vortex flow to ensure uniform spraying of the anticorrosive oil on the inner wall of the terminal, enhance the uniformity of the coating, reduce the retention of the oil liquid inside the nozzle, and improve the reliability and stability of the equipment.

[0063] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic anti-corrosion oiling device for the inside of a circular hollow terminal, characterized in that: It includes a conveyor belt (1) and a frame (2). The conveyor belt (1) is installed above the frame (2). A positioning structure (3) for positioning the terminals is fixed above the conveyor belt (1) by screws. Above the frame (2), there is an oiling structure (4) for oiling the terminals and a lifting structure (7) for driving the lifting of the oiling structure (4); The oiling structure (4) includes a mounting bracket (401). At the bottom of the mounting bracket (401), there is a nozzle (402). A spiral flow guide groove (403) is formed in the inner cavity of the nozzle (402). An anti-blocking structure (5) is arranged at the oil spraying end of the nozzle (402). At the other end of the nozzle (402), there is an adjusting structure (6) for adjusting the angle of the nozzle (402). An intelligent control system for controlling the oil spraying of the nozzle (402) is arranged in the frame (2); The anti-blocking structure (5) includes an anti-blocking plate (501). A rotation limiting structure (502) for limiting the anti-blocking plate (501) is arranged in the inner cavity of the nozzle (402). The intelligent control system includes a PLC control module, a pressure control module, and an execution module. The PLC control module is electrically connected to both the pressure control module and the execution module.

2. The automatic anti-corrosion oiling device for the inside of a circular hollow terminal according to claim 1, wherein: The adjusting structure (6) includes a U-shaped seat (601). A rotating shaft (602) is fixed to the outer wall of the nozzle (402). The rotating shaft (602) passes through the U-shaped seat (601) and is rotatably connected to the U-shaped seat (601). Nuts (603) are threadedly connected to the outer walls at both ends of the rotating shaft (602). One side of each nut (603) is in close contact with the outer wall of the U-shaped seat (601). The anti-blocking plate (501) is arranged at the end of the nozzle (402) away from the rotating shaft (602).

3. A kind of automatic anti-corrosion oiling device for the inside of a circular hollow terminal according to claim 2, characterized in that: The PLC control module includes a central processing unit (CPU), an input / output unit, a power supply unit, and a communication unit. The central processing unit (CPU) is electrically connected to the input / output unit, the power supply unit, and the communication unit.

4. A kind of automatic anti-corrosion oiling device for the inside of a circular hollow terminal according to claim 3, characterized in that: The pressure control module includes a signal conditioning circuit, an analog input circuit, a pressure feedback control algorithm, a data recording and storage unit, and a feedback unit. The signal conditioning circuit is electrically connected to the analog input circuit, the pressure feedback control algorithm, the data recording and storage unit, and the feedback unit; The feedback unit includes a pressure sensor, a human-machine interface, and an alarm component. The human-machine interface is electrically connected to the alarm component.

5. The automatic anti-corrosion oiling device for the inside of a circular hollow terminal according to claim 4, characterized in that: The execution module includes a signal receiving unit and an execution unit. The execution unit includes an electromagnetic valve and an oil supply pump. The oil inlet end of the nozzle (402) is fixedly connected to the oil supply pump through an oil supply pipeline of the nozzle (402). The electromagnetic valve is installed on the oil supply pipeline of the nozzle (402).

6. The automatic anti-corrosion oiling device for the inside of a circular hollow terminal according to claim 1, characterized in that: Micropores (503) are formed in the anti-blocking plate (501). The micropores (503) penetrate the upper surface and the lower surface of the anti-blocking plate (501). The micropores (503) are arranged in an equidistant array.

7. A kind of automatic anti-corrosion oiling device for the inside of a circular hollow terminal according to claim 1, characterized in that: There are three nozzles (402). The three nozzles (402) are arranged in a circumferential array. The inclination of the nozzles (402) with respect to the vertical line is in the range of 15 - 30°.

8. A kind of automatic anti-corrosion oiling device for the inside of a circular hollow terminal according to claim 1, characterized in that: The positioning structure (3) includes a mounting table (301). The mounting table (301) is fixedly connected to the conveyor belt (1) by screws. An electric gripper (302) for clamping the outer wall of the terminal is installed above the mounting table (301). The electric gripper (302) is electrically connected to the PLC control module. There are four groups of mounting tables (301), and the four groups of mounting tables (301) are arranged in a linear array.

9. A kind of automatic anti-corrosion oiling device for the inside of a circular hollow terminal according to claim 1, characterized in that: The rotation limiting structure (502) includes a positioning shaft (5021) and a positioning pin (5022). One end of the positioning shaft (5021) is fixedly connected to the outer wall of the anti-blocking plate (501). A relief groove (5023) is formed in the inner cavity of the nozzle (402). The positioning shaft (5021) is rotatably connected in the relief groove (5023). A positioning hole (5024) is formed in the outer wall of the positioning shaft (5021). One end of the positioning pin (5022) penetrates the outer wall of the nozzle (402) and is inserted into the positioning hole (5024). A positioning screw (5025) is threadedly connected to the other end of the positioning pin (5022), and the upper surface of the positioning screw (5025) is in close contact with the outer wall of the nozzle (402).

10. A kind of automatic anti-corrosion oiling device for the inside of a circular hollow terminal according to claim 1, characterized in that: The lifting structure (7) includes a cylinder (701), a guide rod (702) and a positioning sensor (8). The cylinder (701) and the guide rod (702) are both fixedly connected to the frame (2) by screws. A lifting plate (703) is fixed to the telescopic end of the cylinder (701). An oil spraying frame (704) is fixed to one side of the lifting plate (703). The guide rod (702) penetrates the lifting plate (703) and is slidably connected to the lifting plate (703). The mounting frame (401) and the positioning sensor (8) are both fixed to the bottom of the oil spraying frame (704).

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