A continuous production line for detecting vacuum oiling of a transformer

Abstract

The application discloses a kind of transformer vacuum oil injection detection continuous production line, including oil tank, oil pump, vacuum box, two mobile doors, two moving mechanisms, controller, position detection component, two groups of limit detection components, two reversible conveying mechanisms, two sealing drive mechanisms, staged vacuum unit and detection platform;Vacuum box top is equipped with multiple oil inlets, and the inner cavity of vacuum box is equipped with multiple oil injection pipes, and the opposite two side walls of vacuum box are equipped with inlet and outlet for the inlet and outlet of transformer, and two reversible conveying mechanisms are respectively set corresponding to the two inlets and outlets of vacuum box;Position detection component is arranged in the inner cavity of vacuum box, for detecting the in-place state of transformer on the receiving conveying roller way and adapting with oil injection pipe;Two groups of limit detection components are respectively set corresponding to two inlets and outlets and two reversible conveying mechanisms;Two sealing drive mechanisms are used to drive corresponding mobile door and inlet and outlet sealing fit;Staged vacuum unit is used to simultaneously stage vacuumization to vacuum box and oil tank.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer vacuum tank, and in particular to a transformer vacuum oil injection detection continuous production line. BACKGROUND

[0002] In the large-scale production process of power transformers, vacuum oil injection is the core process to ensure the insulation performance of the transformer. The connection between the transformer before and after oil injection in the conveying roller bed directly determines the automation level and production efficiency of the production line.

[0003] For example, the utility model patent with the authorization announcement number CN214099352U discloses a movable turnover trolley for transformer vacuum oil injection, which comprises a vacuum oil injection chamber. The two sides of the vacuum oil injection chamber are provided with openings for the passage of transformers. The vacuum oil injection chamber is characterized in that a sliding door is arranged on the vacuum oil injection chamber to close the opening. A first roller bed and a second roller bed are arranged in the vacuum oil injection chamber to convey the transformer. The first roller bed and the second roller bed are parallel to each other and communicate with the opening. A fixed roller bed is arranged outside the vacuum oil injection chamber corresponding to the first roller bed and the second roller bed. A movable turnover trolley is arranged between the fixed roller bed and the first roller bed. The core positioning of this movable turnover trolley is the transportation docking equipment of the vacuum oil injection chamber and the external roller bed. It only solves the problem of transferring the transformer between the two internal roller beds corresponding to one external roller bed. Before oil injection, manual confirmation is required to ensure that the turnover trolley is properly docked. After oil injection, manual operation is required to stop oil injection, disassemble the docking pipeline, and then start the turnover trolley for transportation. The work efficiency is low. In addition, oil injection still relies on external independent oil injection equipment. The external oil injection equipment cannot be linked with the transportation rhythm of the turnover trolley, and the oil injection process lacks precise control, which may cause oil overflow due to too fast oil injection or affect the production line rhythm due to too slow oil injection. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a transformer vacuum oil injection detection continuous production line. This transformer vacuum oil injection detection continuous production line can realize full-process automation, reduce manual operation steps, improve sealing and vacuum reliability, ensure the purity of insulating oil, has strong production line continuity, and improves production efficiency.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] A continuous production line for transformer vacuum oil filling and testing includes an oil storage tank, an oil pump, a vacuum chamber, two movable doors, and two moving mechanisms. The vacuum chamber has multiple oil inlets on its top and multiple oil filling pipes connected to each inlet within its inner cavity. The oil outlet of the oil storage tank is connected to each inlet via the oil pump. Opposite side walls of the vacuum chamber have inlets / outlets for the transformer to enter and exit. The two movable doors are adapted to their respective inlets / outlets and are movably installed on the outer side walls of the vacuum chamber. The two moving mechanisms drive the corresponding movable doors to move horizontally. A front conveyor roller conveyor and a rear conveyor roller conveyor are respectively located at the front and rear of the vacuum chamber. The inner cavity of the vacuum chamber has a receiving conveyor roller conveyor, and each oil filling pipe is located above the receiving conveyor roller conveyor. The system is characterized by further including a controller, a position detection component, two sets of limit detection components, two tumbler conveying mechanisms, two sealing drive mechanisms, a staged vacuuming unit, and a testing platform.

[0007] Two flip-up conveyor mechanisms are respectively set up at the two inlets and outlets of the vacuum box, used for docking and conveying the front conveyor roller, the rear conveyor roller and the receiving conveyor roller to realize the continuous conveying of the transformer, as well as the translation of the upward-flipping avoidance sliding door;

[0008] The position detection component is located inside the vacuum chamber and is used to detect the transformer's position on the receiving conveyor roller and is compatible with the oil injection pipe.

[0009] Two sets of limit detection components are respectively set for two entrances and exits and two flip-up conveyor mechanisms. They are used to detect the opening and closing status of the corresponding moving doors, control the flip-up conveyor mechanism to flip up or down, and detect the flip-up conveyor mechanism to flip up into position.

[0010] Two sealing drive mechanisms are used to drive the corresponding moving doors to seal against the entrance / exit.

[0011] The staged vacuum unit is used to simultaneously perform staged vacuuming on the vacuum chamber and the oil storage tank.

[0012] The testing platform is located at the rear end of the rear conveyor roller conveyor and is used to test the insulation performance and oil filling compliance status of the transformer after oil filling.

[0013] The signal output terminals of the position detection component and the limit detection component are electrically connected to the signal input terminal of the controller. The moving mechanism, the sealing drive mechanism, the reversible conveying mechanism, the staged vacuuming unit, the oil pump, and the detection platform are electrically connected to the signal output terminal of the controller. By detecting each state through the position detection component and the limit detection component, the controller further controls the linkage of the moving mechanism, the sealing drive mechanism, the reversible conveying mechanism, the staged vacuuming unit, and the oil pump to automatically transport, seal, vacuum, inject oil, and detect the transformer.

[0014] When the current conveying roller way is empty and the vacuum box is idle, the controller controls the moving mechanism to drive the moving door to move away from the entrance and exit, so that the moving door is completely misaligned with the corresponding entrance and exit; the controller controls the reversible conveying mechanism to turn down, so that the reversible conveying mechanism is in a horizontal state, and the conveying function of the reversible conveying mechanism is started to convey the transformer to the receiving conveying roller way; after the position detection component detects that the transformer is in place, the receiving conveying roller way is triggered to stop conveying, so that the oil injection port of the transformer corresponds to the corresponding oil injection pipe, and the oil injection pipe is inserted into the oil injection port of the transformer; at the same time, the limiting detection component is triggered to send a signal to make the reversible conveying mechanism turn up, so as to provide a movable space for the moving door; when the reversible conveying mechanism is detected to be turned up to a position, the moving mechanism is triggered to drive the moving door to move close to the entrance and exit, so that the moving door corresponds to the corresponding entrance and exit; after the sealing driving mechanism is triggered to drive the corresponding moving door to be sealed and combined with the entrance and exit, the vacuum box is completely sealed; then the staged vacuumizing unit is triggered to simultaneously perform staged vacuumizing on the vacuum box and the oil storage tank; when the pressure in the vacuum box and the oil storage tank is ≤10 Pa, the oil pump is triggered to be opened, so that the insulating oil is pumped into the transformer in the vacuum box through the oil pump; after the oil injection, the two moving doors are opened at the same time, and the two reversible conveying mechanisms are turned down at the same time, so that the reversible conveying mechanism is in a horizontal state; the transformer in the vacuum box which has completed the oil injection is conveyed to the detection platform through the reversible conveying mechanism as an output end for detection, and the transformer on the reversible conveying mechanism as an input end is continuously conveyed to the receiving conveying roller way in the vacuum box for oil injection.

[0015] In a preferred embodiment, the reversible conveying mechanism comprises a first roller frame, a second roller frame and a turnover driving mechanism, the second roller frame is arranged on the inner side of the first roller frame, the inner end of the second roller frame corresponds to the corresponding entrance and exit and the receiving conveying roller way, the turnover driving mechanism is connected between the outer end of the second roller frame and the inner end of the first roller frame, and can drive the second roller frame to turn 80°-90° relative to the first roller frame.

[0016] In a further preferred embodiment, the overturning driving mechanism comprises a hydraulic oil pump, an overturning oil cylinder, a swing arm and a rotation-stopping block. The hydraulic oil pump is installed at the bottom of the first roller frame. The cylinder body of the overturning oil cylinder is hinged to the inner end side wall of the first roller frame, and the overturning oil cylinder is connected to the hydraulic oil pump. The piston rod end of the overturning oil cylinder is hinged to the outer end side wall of the second roller frame. The swing arm is above the overturning oil cylinder. The inner end of the swing arm is hinged to the outer end side wall of the second roller frame, and the outer end of the swing arm is hinged to the inner end side wall of the first roller frame. The rotation-stopping block is installed on the outer end edge of the swing arm and corresponds to the limit detection component. The hydraulic oil pump is electrically connected to the corresponding signal output end of the controller. The hydraulic oil pump provides power for the overturning oil cylinder. The combination of the hydraulic oil pump and the overturning oil cylinder provides sufficient overturning driving force, which can easily drive the second roller frame with increased weight due to the thickening of the roller to overturn from horizontal butt joint to a large angle close to vertical with the first roller frame, realizing vertical storage of the heavy roller frame, solving the physical blocking problem caused by insufficient overturning angle of the second roller frame in the original structure, ensuring smooth closing of the movable door and avoiding interruption of the production process.

[0017] In a further preferred embodiment, the limit detection component comprises two door opening to position proximity switches, two door closing to position proximity switches and two overturning limit switches. The door opening to position proximity switches and the door closing to position proximity switches are installed on one side of the corresponding doorway. The overturning limit switches are installed on the side wall of the first roller frame of the overturning conveying mechanism, and the rotation-stopping block corresponds to the overturning limit switches. The signal output ends of the two door opening to position proximity switches, the two door closing to position proximity switches and the two overturning limit switches are electrically connected to the corresponding signal input ends of the controller. The door opening to position proximity switches are used to feedback the fully open state of the movable door. The door closing to position proximity switches are used to detect the state that the movable door can completely close the corresponding doorway. The overturning limit switches are used to accurately detect the upward overturning angle of the second roller frame. When the door opening to position proximity switch sends an opening to position signal to the controller, the second roller frame of the overturning conveying mechanism is triggered to overturn upward. When the rotation-stopping block on the swing arm contacts and cooperates with the overturning limit switch, the second roller frame of the overturning conveying mechanism is overturned upward to the position, and the moving mechanism is triggered to drive the movable door to close. When the movable door can completely close the corresponding doorway, the door closing to position proximity switch sends a door closing to position signal to the controller, triggering the sealing driving mechanism to drive the corresponding movable door to seal and fit with the doorway, so that the vacuum box is completely sealed.

[0018] In a further preferred embodiment, the rotatable conveying mechanism further includes multiple rollers and a rotation drive mechanism capable of driving each roller to rotate. A portion of the rollers are rotatably mounted on the first roller frame, and another portion are rotatably mounted on the second roller frame. The rotation drive mechanism is mounted on both the first and second roller frames. By driving each roller to rotate on the first and second roller frames through the rotation drive mechanism, the conveying function of the conveying mechanism is realized.

[0019] In a further preferred embodiment, the rotation drive mechanism includes a drive motor, a reducer, a ring chain, and multiple sprockets. The drive motor and reducer are both mounted on the first roller frame. The output shaft of the drive motor is connected to the rotating shaft of one of the rollers via the reducer. Each sprocket is mounted on the end of the rotating shaft of its corresponding roller, and the ring chain is sleeved on each sprocket. By reducing the speed through the reducer, the drive motor drives the rotating shaft of one of the rollers to rotate. The ring chain then meshes with each sprocket, achieving synchronous and unidirectional rotation of all rollers, ensuring smooth transformer transmission.

[0020] In a preferred embodiment, the moving mechanism includes a servo motor, gears, a rack, an upper linear guide groove, a lower linear guide groove, a lower linear guide rail, two rollers, two upper guide posts, and two lower guide posts. The upper and lower linear guide grooves are respectively installed on the upper and lower edges of the outer wall of the vacuum chamber and are parallel to each other. The lower linear guide rail is installed on the lower edge of the outer wall of the vacuum chamber, and is located inside the lower linear guide groove and parallel to it. The moving door is located between the upper and lower linear guide grooves. Two axles perpendicular to the width direction of the moving door are fixed on the lower edge of the moving door. The length of the axles is greater than the thickness of the rollers. The two rollers are rotatably mounted on their respective axles and can move along the axial direction of their respective axles. Both rollers are located on the lower linear guide rail and can move along it. The two lower guide posts are installed on the lower edge of the moving door and are located in the lower linear guide groove. The upper guide post is installed on the upper edge of the sliding door and is located in the upper straight guide post, allowing it to move along the upper straight guide post. The inner wall of the lower straight guide post has two lower guide notches corresponding to the corresponding lower guide posts. A lower moving space is provided between the lower straight guide post and the lower straight guide rail, allowing the lower guide posts to move. This lower moving space communicates with the lower straight guide post through the two lower guide notches. The inner wall of the upper straight guide post has two upper guide notches corresponding to the corresponding upper guide posts. An upper moving space is provided between the upper straight guide post and the sliding door, allowing the upper guide posts to move in and out. This upper moving space communicates with the upper straight guide post through the two upper guide notches. A servo motor is installed on the sliding door, a gear is installed on the power output shaft of the servo motor, and a rack is installed on the lower edge of the outer wall of the vacuum chamber and extends along the length of the lower straight guide post. The rack meshes with the gear.

[0021] In a preferred embodiment, the sealing driving mechanism is a push-pull mechanism and a clamping piece, the clamping piece is installed on the movable door and buckled with the power output end of the push-pull mechanism; when the movable door corresponds to the entrance, the push-pull mechanism can drive the movable door to move away or close to the entrance to realize sealing or disengagement; the edge of the entrance is provided with an annular sealing surface, and the annular sealing surface is provided with an annular sealing ring matched with the movable door.

[0022] In a further preferred embodiment, the push-pull mechanism includes two left push-pull units and two right push-pull units, the two left push-pull units are respectively installed on the left side edges of the corresponding entrances, the two right push-pull units are respectively installed on the right side edges of the corresponding entrances, the left side edge of the movable door is provided with a left limiting notch buckled with the left push-pull unit, and the right side edge of the movable door is provided with a right limiting notch buckled with the right push-pull unit; the left limiting notch and the right limiting notch constitute the clamping piece.

[0023] When the movable door is in the open position, the left push-pull unit and the right push-pull unit are in the extended state, and the left push-pull unit and the right push-pull unit are in the waiting alignment position with the limiting notch of the movable door; the upper guide column is in the upper straight guide slot, the lower guide column is in the lower straight guide slot, and the roller is on the lower straight guide rail. When the movable door is to be closed, the servo motor is started and drives the gear to rotate, the gear is engaged with the rack fixed on the outside of the vacuum box, the rotary motion is converted into a linear driving force, and the movable door is moved along the horizontal direction to the entrance; during the movement of the movable door, the upper guide column slides along the upper straight guide slot, the lower guide column slides along the lower straight guide slot, and the roller rolls along the lower straight guide rail, and the three cooperate to ensure the straightness of the translation of the movable door and avoid deviation; when the left and right limiting notches of the movable door are aligned with the output ends of the left and right push-pull units, the servo motor stops working, and the movable door is translated to be in position (at this time, the movable door is just preliminarily aligned with the entrance, but does not contact the annular sealing ring on the edge of the entrance).

[0024] When the mobile door is translated to the position, the left limit gap of the mobile door is buckled with the output end of the left push-pull unit, and the right limit gap of the mobile door is buckled with the output end of the right push-pull unit. Then, the left push-pull unit and the right push-pull unit are started, and the lower guide column enters the lower moving space through the lower guide gap of the lower linear guide slot with the initial action of the left push-pull unit and the right push-pull unit; the upper guide column enters the upper moving space through the upper guide gap of the upper linear guide slot synchronously (the two upper guide columns and the two lower guide columns are switched from "translation guide" to "compression guide", and the mobile door has the freedom of horizontal (perpendicular to the translation direction) movement, which prepares for the mobile door to fit the annular sealing ring); then, the left push-pull unit and the right push-pull unit continue to act, exerting a horizontal pulling force on the left and right edges of the mobile door, so that the inner surface edge of the mobile door is tightly fitted on the edge of the entrance through the annular sealing ring, and the sealing surface of the mobile door and the entrance is fully fitted without local looseness or pressure concentration, so that the vacuum box forms a sealed space.

[0025] In a further preferred embodiment, the left push-pull unit and the right push-pull unit each include a push-pull seat, a push-pull oil cylinder and two limit rings. The push-pull seat is installed on the outer side wall of the vacuum box, the push-pull oil cylinder is installed on the push-pull seat, the piston rod of the push-pull oil cylinder extends towards the direction of the mobile door and is perpendicular to the inner surface of the mobile door, and the two limit rings are fixedly installed on the end of the piston rod of the push-pull oil cylinder, forming a limit buckle groove between the two limit rings; each limit buckle groove is buckled with the corresponding left limit gap and right limit gap. When the mobile door is closed, the left limit gap of the mobile door is buckled with the limit buckle groove of the left push-pull unit, and the right limit gap of the mobile door is buckled with the limit buckle groove of the right push-pull unit, so that the piston rod of the push-pull oil cylinder is rigidly connected with the mobile door, and the pulling force is directly applied to the edge of the mobile door, providing a prerequisite for the mobile door to fully fit the sealing surface of the entrance, forcibly making the mobile door accurately cooperate with the sealing surface of the entrance, ensuring that the mobile door is completely aligned with the sealing surface, and avoiding sealing misalignment.

[0026] In a further preferred embodiment, a left limit block is provided on the left side edge of the mobile door, and the left limit gap is provided on the left limit block with the opening of the left limit gap facing right; a right limit block is provided on the right side edge of the mobile door, and the right limit gap is provided on the right limit block with the opening of the right limit gap facing right. The left limit block and the right limit block provide rigid support for the edge of the mobile door, avoiding deformation of the edge of the heavy mobile door due to the opening of the gap.

[0027] In the preferred solution, the position detection component is a plurality of position sensors, each of which is arranged on the inner wall of the vacuum box at equal intervals along the conveying direction of the receiving conveying roller way and is located above the receiving conveying roller way; the position sensors are the same in number as the oil injection pipes and are in one-to-one correspondence, and each position sensor is electrically connected to the corresponding signal input end of the controller. The position sensors are used to detect whether the transformer has arrived on the receiving conveying roller way and to correspond to the corresponding oil injection pipes, respectively, to provide a trigger signal for the opening and closing of the moving door and the overturning of the second roller frame.

[0028] In the further preferred solution, the vacuum box is provided with a visual monitoring unit and an oil injection manipulator capable of clamping the oil injection pipe and inserting the lower end of the oil injection pipe into the oil injection port of the transformer through lifting and translation. The visual monitoring unit is arranged on the inner wall of the vacuum box, and the shooting end of the visual monitoring unit faces the receiving conveying roller way; the visual monitoring unit is electrically connected to the corresponding signal input end of the controller, and the oil injection manipulator is electrically connected to the corresponding signal output end of the controller. The position sensors can only achieve coarse positioning of the transformer, the visual monitoring unit can capture the specific position of the oil injection port of the transformer in real time (including horizontal offset and angular deviation), and can feed back the coordinate data to the controller; the oil injection manipulator clamps the oil injection pipe according to the data, adjusts the posture through lifting and translation, and accurately inserts the lower end of the oil injection pipe into the oil injection port. The oil injection manipulator is a prior art, and therefore will not be described here. The visual monitoring unit generally includes a camera and an image processing system, the camera has high resolution and is only used to capture the slight positional deviation of the oil injection port and to feed back the positional data in real time, which belongs to the prior art and will not be described here.

[0029] In the preferred solution, the hierarchical vacuum pumping unit is connected between the side interface of the vacuum tank and the side interface of the oil storage tank; the hierarchical vacuum pumping unit comprises a Roots pump, a rough vacuum pump, a fine vacuum pump, a first vacuum valve, a second vacuum valve, a third vacuum valve, a fourth vacuum valve, an oil storage vent valve, an oil injection vent valve, a low vacuum gauge and a high vacuum gauge; the side interface of the vacuum tank is connected with the first vacuum valve, the Roots pump, the second vacuum valve and the rough vacuum pump in sequence through a first pipeline; the side interface of the oil storage tank is connected on the first pipeline between the first vacuum valve and the Roots pump through a second pipeline, and the oil storage vent valve and the third vacuum valve are arranged on the second pipeline; the first pipeline between the Roots pump and the second vacuum valve is connected with the fourth vacuum valve and the fine vacuum pump in sequence through a third pipeline; the low vacuum gauge is arranged in the inner cavity of the vacuum tank, and the high vacuum gauge is arranged on the first pipeline between the first vacuum valve and the Roots pump; the top of the oil storage tank is provided with an oil inlet valve, and the oil injection vent valve is arranged on the side of the vacuum tank; the signal output ends of the low vacuum gauge and the high vacuum gauge are electrically connected with the corresponding signal input ends of the controller, and the Roots pump, the rough vacuum pump, the fine vacuum pump, the first vacuum valve, the second vacuum valve, the third vacuum valve, the fourth vacuum valve, the oil inlet valve, the oil storage vent valve and the oil injection vent valve are electrically connected with the corresponding signal output ends of the controller.

[0030] In the further preferred solution, the hierarchical vacuum pumping unit further comprises a condenser, which is connected on the first pipeline between the first vacuum valve and the Roots pump; the bottom of the condenser is provided with a first liquid discharge port, and a first on-off valve is arranged at the first liquid discharge port. When the vacuum is pumped, the pumped air enters the condenser, the condenser condenses the water vapor and oil vapor in the air into liquid, and the liquid can be discharged from the first liquid discharge port by opening the first on-off valve in the later stage, so as to prevent the water vapor and oil vapor from polluting the Roots pump, the rough vacuum pump and the fine vacuum pump, and prolong the service life of the equipment (the first on-off valve needs to be closed before the equipment is started).

[0031] In the preferred solution, the oil outlet of the oil pump is connected with the corresponding oil inlet of the vacuum tank through a multi-way oil injection flow monitoring unit; the oil outlet of the oil pump is connected with a control valve, a flow meter and the corresponding oil inlet at the top of the vacuum tank in sequence through a fourth pipeline; the flow meter is electrically connected with the corresponding signal input end of the controller, and the control valve is electrically connected with the corresponding signal output end of the controller. The flow meter displays the oil injection flow (unit: L / H) corresponding to the transformer in real time, the oil injection speed can be accurately controlled by adjusting the opening degree of the control valve, the oil injection rhythm of different capacity transformers can meet the process requirements, and internal component damage caused by oil impact can be avoided.

[0032] The hierarchical vacuum pumping unit performs the hierarchical vacuum pumping and oil injection steps as follows:

[0033] (1) Sealing preparation: the transformer to be filled with oil is transported into the vacuum box, the lower end of the oil injection pipe is inserted into the oil injection port of the transformer, the movable door is closed to ensure that the vacuum box is completely sealed, the oil injection break valve of the vacuum box, the oil inlet valve and the oil storage break valve of the oil storage tank are closed;

[0034] (2) Staged vacuum pumping

[0035] (2-1) Low vacuum rough pumping stage: open the first vacuum pumping valve, the third vacuum pumping valve and the second vacuum pumping valve, and start the rough vacuum pump; the pressure in the vacuum box is monitored through the low vacuum gauge, and the pressure in the oil storage tank is monitored synchronously through the high vacuum gauge, until the pressures of both are reduced to below 100 Pa, and the rough vacuum pumping is completed;

[0036] (2-2) High vacuum fine pumping stage: close the second vacuum pumping valve, open the fourth vacuum pumping valve (fine pumping pump branch), and start the Roots pump and the fine pumping pump; the pressures in the vacuum box and the oil storage tank are monitored through the high vacuum gauge (mainly monitoring the oil storage tank) and the low vacuum gauge (auxiliary monitoring the vacuum box) in coordination, until the pressures in the vacuum box and the oil storage tank are both ≤10 Pa, and the high vacuum process requirement is reached;

[0037] (3) According to the capacity of the transformer, the controller matches and starts the corresponding oil injection flow monitoring unit, and opens the control valve of the oil injection flow monitoring unit; then the oil pump is started, the oil inlet valve of the oil storage tank is slowly opened, and the insulating oil is pumped into the transformer in the vacuum box after being measured by the corresponding oil injection flow monitoring unit;

[0038] (4) Oil injection completion and break: after the oil injection is completed, the oil pump, the oil inlet valve of the oil storage tank and the oil injection flow monitoring unit are closed; the oil storage break valve of the oil storage tank is slowly opened first, so that the pressure in the oil storage tank returns to normal pressure, and then the oil injection break valve of the vacuum box is slowly opened (to avoid oil splashing caused by sudden change of tank pressure); after the pressure in the vacuum box returns to normal pressure, the movable door is opened to transport the transformer out.

[0039] In the preferred scheme, the bottom of the vacuum box is provided with a second liquid discharge port, and a second on-off valve is arranged at the second liquid discharge port. When the oil injection is completed, the liquid in the vacuum box can be discharged from the second liquid discharge port by opening the second on-off valve (the second on-off valve needs to be closed before the equipment is started).

[0040] In the preferred scheme, the transformer vacuum oil injection detection continuous production line further comprises a rotating mechanism, a detection conveying unit and an unqualified rejection mechanism, the rotating mechanism is arranged at one side of the first roller frame of the reversible conveying mechanism as the output end, the detection conveying unit is installed on the power output end of the rotating mechanism, the detection platform is above the detection conveying unit, the detection conveying unit is provided with a qualified outlet and an unqualified rejection port, the rear conveying roller bed is connected with the qualified outlet, and the unqualified rejection mechanism is connected with the unqualified rejection port. The above-mentioned receiving conveying roller bed, detection conveying unit and unqualified rejection mechanism are all conveying mechanisms with power driving, and such conveying mechanisms with power driving and the rotating mechanism are prior art, and thus will not be described here.

[0041] Compared with the prior art, the present application has the following advantages:

[0042] The present application takes "transformer continuous conveying" as the starting point, "precise oil injection" as the core and "sealing and vacuum" as the guarantee, forms a strong correlation closed loop of "presequence action supporting subsequent function and subsequent feedback optimizing presequence precision", and the specific correlation is as follows:

[0043] (1) The transformer continuous conveying automatic feeding and discharging (reversible conveying mechanism) is the basic premise of all subsequent actions

[0044] The reversing action of the second roller frame directly determines whether the movable door can be smoothly closed: when conveying the transformer, the reversing driving mechanism controls the second roller frame to be reversed downward to be horizontal, is accurately connected with the receiving conveying roller bed, and ensures that the transformer is smoothly entered into the vacuum box; after the transformer is in place, the second roller frame is reversed upward by 80°-90° for storage, completely avoids the moving path of the movable door, and clears the physical obstacles for the movable door to be closed; if the reversing angle is insufficient or not in place, the movable door will be blocked by the roller frame, and subsequent sealing and vacuumizing actions cannot be started.

[0045] The linkage of the receiving conveying roller bed and the position sensor determines the injection pipe docking accuracy: after the transformer is entered into the vacuum box, the receiving conveying roller bed drives the transformer to move, and the position sensor detects the position of the transformer in real time; when it is detected that the transformer is in place, the receiving conveying roller bed is immediately stopped, so that the transformer injection port is one-to-one connected with the injection pipe; if the conveying positioning deviation, the injection pipe cannot be accurately connected with the injection port, resulting in injection overflow or insufficient injection.

[0046] (2) The sealing effect of the movable door and the entrance and exit of the vacuum box is the necessary condition for the staged vacuumizing

[0047] The translation alignment and push-pull compression of the movable door depend on the storage state of the second roller frame: only when the second roller frame is turned and stored in place, the moving mechanism can drive the movable door to translate to the corresponding state of the entrance and exit; then the push-pull mechanism pulls the movable door in, so that the movable door tightly abuts against the annular sealing surface through the annular sealing ring, and complete sealing of the vacuum box is realized; if the second roller frame is not stored, the movable door cannot be aligned in translation, and the sealing action directly fails.

[0048] The integrity of the sealing directly determines the efficiency and effect of vacuumizing: the staged vacuumizing unit needs to simultaneously vacuumize the vacuum box and the oil storage tank to ≤10 Pa, if the movable door is not tightly sealed (there is a gap), air will continuously penetrate, and the vacuum degree cannot meet the standard, even if the oil pump is started to inject oil, the insufficient vacuum will cause the insulating oil to mix with bubbles, affecting the insulation performance of the transformer; the sealing is a prerequisite for vacuumizing, and the vacuumizing is a process basis for oil injection.

[0049] (3) The staged vacuumizing and the oil injection pipe are connected and matched, which is the core guarantee of precise oil injection

[0050] The timing of vacuumizing is linked with the sealing and oil injection actions: only when the door closing proximity switch feeds back the sealing in place signal, the controller will trigger the staged vacuumizing unit to start; when the vacuum degree meets the standard, the controller triggers the oil pump to start oil injection; if the oil is injected when the vacuumizing does not meet the standard, bubbles will be left in the oil, and if the vacuumizing is performed when the sealing does not meet the standard, energy will be wasted and the process will fail, and the timing of the three is strictly linked.

[0051] The docking accuracy of the oil injection pipe depends on the conveying positioning and the vacuum environment: the position sensor ensures that the oil injection pipe is accurately aligned with the transformer oil injection port (without deviation), and the vacuum environment (≤10 Pa) can reduce the flow resistance of the oil, avoid oil splashing or overflowing due to pressure difference during oil injection, and ensure the purity of the insulating oil; the conveying positioning is the spatial basis for the docking of the oil injection pipe, and the vacuum environment is the process guarantee for the stability of oil injection.

[0052] (4) The modules of the present application form a full-process closed-loop linkage through the controller

[0053] The actions of all modules are triggered by the controller according to the sensor signals: door opening proximity switch → turning drive mechanism starts (roller frame docking) → position sensor → second roller frame storage → door closing proximity switch → push-pull mechanism sealing → staged vacuumizing → vacuum meets the standard → oil pump oil injection, the signal output of each link is the starting condition of the next link, and the failure of any module action will trigger the process to pause, ensuring the reliability and accuracy of the entire production process. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is a structural schematic diagram of an embodiment of the present application;

[0055] Figure 2This is a schematic diagram of the movable door in the closed state according to a specific embodiment of the present invention;

[0056] Figure 3 This is a schematic diagram of the movable door in the open state according to a specific embodiment of the present invention;

[0057] Figure 4 This is a structural schematic diagram (from below) of a specific embodiment of the movable door and entrance / exit of the present invention.

[0058] Figure 5 This is a schematic diagram (top view) of the moving door and entrance / exit structure according to a specific embodiment of the present invention.

[0059] Figure 6 yes Figure 5 Cross-sectional view of AA in the middle;

[0060] Figure 7 This is a schematic diagram of the structure of the reversible conveyor mechanism according to a specific embodiment of the present invention;

[0061] Figure 8 This is a schematic diagram of the internal structure of the vacuum chamber according to a specific embodiment of the present invention;

[0062] Figure 9 This is a connection structure diagram of the staged vacuum pumping unit in a specific embodiment of the present invention. Detailed Implementation

[0063] The following description, in conjunction with the accompanying drawings and preferred embodiments of the present invention, will provide further details.

[0064] like Figures 1-9 As shown, the transformer vacuum oil injection testing continuous production line in this embodiment includes an oil storage tank 1, an oil pump 2, a vacuum box 3, two movable doors 4, two moving mechanisms 5, a controller, a position detection component 6, two sets of limit detection components 7, two tumbler conveying mechanisms 8, two sealing drive mechanisms 9, a staged vacuuming unit 10, and a testing platform 11. The top of the vacuum box 3 is provided with multiple oil inlets 31, and the inner cavity of the vacuum box 3 is provided with multiple oil injection pipes 32 corresponding to each oil inlet 31. The oil outlet of the oil storage tank 1 is connected to each oil inlet 31 through the oil pump 2. The opposite side walls of the vacuum box 3 are provided with inlets and outlets 33 for the transformer 12 to enter and exit. The two movable doors 4 are respectively adapted to the corresponding inlets and outlets 33 and can be movably installed on the outer side walls of the vacuum box 3. The two moving mechanisms 5 are used to drive the corresponding movable doors 4 to move horizontally. The front and rear sides of the vacuum box 3 are respectively provided with a front conveyor roller 38 and a rear conveyor roller 39. The inner cavity of the vacuum box 3 is provided with a receiving conveyor roller 34, and each oil injection pipe 32 is located above the receiving conveyor roller 34.

[0065] Two reversible conveying mechanisms 8 are arranged respectively corresponding to the two entrances 33 of the vacuum box 3, for the interface conveying of the front conveying roller 38, the rear conveying roller 39 and the receiving conveying roller 34 to realize the continuous conveying of the transformer 12, and the translation of the upwardly-reversible avoidance moving door 4;

[0066] The position detection component 6 is arranged in the inner cavity of the vacuum box 3, for detecting the in-place state of the transformer 12 on the receiving conveying roller 34 and adapting the oil injection pipe 32;

[0067] Two sets of limit detection components 7 are arranged respectively corresponding to the two entrances 33 and the two reversible conveying mechanisms 8, for detecting the opening and closing state of the corresponding moving door 4, controlling the upward or downward turning of the reversible conveying mechanism 8, and detecting the upward turning in-place state of the reversible conveying mechanism 8;

[0068] Two sealing driving mechanisms 9 are arranged for driving the corresponding moving door 4 to seal and adhere to the entrance 33;

[0069] The hierarchical vacuumizing unit 10 is arranged for simultaneously performing hierarchical vacuumizing on the vacuum box 3 and the oil storage tank 1;

[0070] The detection platform 11 is arranged at the rear end of the rear conveying roller 39, for performing the insulation performance and the oil injection standard state performance detection on the injected transformer 12;

[0071] The signal output ends of the position detection component 6 and the limit detection component 7 are electrically connected with the signal input ends of the controller, and the moving mechanism 5, the sealing driving mechanism 9, the reversible conveying mechanism 8, the hierarchical vacuumizing unit 10, the oil pump 2 and the detection platform 11 are electrically connected with the signal output ends of the controller, through the detection of each state by the position detection component 6 and the limit detection component 7, and further through the linkage control of the moving mechanism 5, the sealing driving mechanism 9, the reversible conveying mechanism 8, the hierarchical vacuumizing unit 10 and the oil pump 2 by the controller, the automatic conveying, sealing, vacuumizing, oil injection and detection of the transformer are realized.

[0072] When the current transformer is transported to the position of the conveying roller 38 and the vacuum tank 3 is in the idle state, the moving mechanism 5 is controlled by the controller to drive the moving door 4 to move away from the exit 33, so that the moving door 4 is completely staggered with the corresponding exit 33; the controller controls the reversible conveying mechanism 8 to be flipped downward, so that the reversible conveying mechanism 8 is in the horizontal state, and the conveying function of the reversible conveying mechanism 8 is started to transport the transformer 12 to the receiving conveying roller 34; after the position detection part 6 detects that the transformer 12 is in place, the receiving conveying roller 34 is triggered to stop conveying, so that the oil injection port of the transformer 12 corresponds to the corresponding oil injection pipe 32, and the limiting detection part 7 is triggered to send a signal to flip the reversible conveying mechanism 8 upward to provide a movable space for the moving door 4; when the reversible conveying mechanism 8 is flipped upward to the position, the moving mechanism 5 is triggered to drive the moving door 4 to move close to the exit 33, so that the moving door 4 corresponds to the corresponding exit 33, and the sealing driving mechanism 9 is triggered to drive the corresponding moving door 4 to be sealed and combined with the exit 33, so that the vacuum tank 3 is completely sealed; the vacuum tank 3 and the oil storage tank 1 are simultaneously subjected to the staged vacuumizing by the staged vacuumizing unit 10; when the pressures in the vacuum tank 3 and the oil storage tank 1 are both ≤10 Pa, the oil pump 2 is triggered to be opened, so that the insulating oil is pumped into the transformer 12 in the vacuum tank 3 through the oil pump 2 and the oil injection pipe 32; after the oil injection, the two moving doors 4 are opened at the same time, and the two reversible conveying mechanisms 8 are flipped downward at the same time, so that the reversible conveying mechanism 8 is in the horizontal state; the transformer in the vacuum tank 3 which has completed the oil injection is conveyed to the detection platform 11 through the reversible conveying mechanism 8 as the output end, and the transformer on the reversible conveying mechanism 8 as the input end is continuously conveyed to the receiving conveying roller 34 in the vacuum tank 3 to wait for the oil injection.

[0073] The reversible conveying mechanism 8 comprises a first roller frame 81, a second roller frame 82 and a flipping driving mechanism 83; the second roller frame 82 is arranged at the inner side of the first roller frame 81, the inner end of the second roller frame 82 corresponds to the corresponding exit 33 and the receiving conveying roller 34, the flipping driving mechanism 83 is connected between the outer end of the second roller frame 82 and the inner end of the first roller frame 81, and can drive the second roller frame 82 to flip 80°-90° relative to the first roller frame 81.

[0074] The turnover driving mechanism 83 comprises a hydraulic oil pump (not shown in the figure), a turnover oil cylinder 831, a swing arm 832 and a rotation stopping block 833. The hydraulic oil pump is installed at the bottom of the first roller frame 81. The cylinder body of the turnover oil cylinder 831 is hinged to the inner end side wall of the first roller frame 81, and the turnover oil cylinder 831 is connected with the hydraulic oil pump. The piston rod end of the turnover oil cylinder 831 is hinged to the outer end side wall of the second roller frame 82. The swing arm 832 is above the turnover oil cylinder 831. The inner end of the swing arm 832 is hinged to the outer end side wall of the second roller frame 82, and the outer end of the swing arm 832 is hinged to the inner end side wall of the first roller frame 81. The rotation stopping block 833 is installed on the outer end edge of the swing arm 832, and is correspondingly matched with the limit detection component 7. The hydraulic oil pump is electrically connected with the corresponding signal output end of the controller. The above-mentioned hydraulic oil pump provides power for the turnover oil cylinder 831. The combination of the hydraulic oil pump and the turnover oil cylinder 831 provides sufficient turnover driving force, which can easily drive the second roller frame 82 with increased weight due to the thickening of the roller, so that the second roller frame 82 is turned from horizontal butt joint to a large angle nearly perpendicular to the first roller frame 81, realizing vertical storage of the heavy roller frame, solving the physical blocking problem caused by insufficient turning angle of the second roller frame 82 in the original structure, ensuring smooth closing of the movable door 4, and avoiding interruption of the production process.

[0075] The limit detection component 7 comprises two door opening to position proximity switches 71, two door closing to position proximity switches 72 and two turnover limit switches 73. The door opening to position proximity switch 71 and the door closing to position proximity switch 72 are installed on one side of the corresponding access 33. The turnover limit switch 73 is installed on the side wall of the first roller frame 81 of the turnover conveying mechanism 8, and the rotation stopping block 833 is correspondingly matched with the turnover limit switch 73. The signal output ends of the two door opening to position proximity switches 71, the two door closing to position proximity switches 72 and the two turnover limit switches 73 are respectively electrically connected with the corresponding signal input ends of the controller. The above-mentioned door opening to position proximity switch 71 is used for feeding back the completely open state of the movable door 4. The above-mentioned door closing to position proximity switch 72 is used for detecting the state that the movable door 4 can completely close the corresponding access 33. The above-mentioned turnover limit switch 73 is used for accurately detecting the upward turning angle of the second roller frame 82. When the door opening to position proximity switch 71 sends a door opening to position signal to the controller, the second roller frame 82 of the turnover conveying mechanism 8 is triggered to turn upward. When the rotation stopping block 833 on the swing arm 832 is in contact with the turnover limit switch 73, the second roller frame 82 of the turnover conveying mechanism 8 is turned upward to the position, and the moving mechanism 5 is triggered to drive the movable door 4 to close. When the movable door 4 can completely close the corresponding access 33, the door closing to position proximity switch 72 sends a door closing to position signal to the controller, and the sealing driving mechanism 9 is triggered to drive the corresponding movable door 4 to be sealed and fitted with the access 33, so that the vacuum box 3 is completely sealed.

[0076] The reversible conveying mechanism 8 further comprises a plurality of rollers 84 and a rotating driving mechanism 85 capable of driving the rollers 84 to rotate, a part of the rollers 84 are rotatably installed on the first roller frame 81, another part of the rollers 84 are rotatably installed on the second roller frame 82, and the rotating driving mechanism 85 is installed on the first roller frame 81 and the second roller frame 82. The rotating driving mechanism 85 drives the rollers 84 to rotate on the first roller frame 81 and the second roller frame 82, thereby realizing the conveying function of the conveying mechanism.

[0077] The rotating driving mechanism 85 comprises a driving motor, a speed reducer, an annular chain 851 and a plurality of chain wheels. The driving motor and the speed reducer are installed on the first roller frame 81, and the output shaft of the driving motor is in transmission connection with the rotating shaft of one of the rollers 84 through the speed reducer. Each chain wheel is installed on the end of the rotating shaft of the corresponding roller 84, and the annular chain 851 is sleeved on each chain wheel. The driving motor drives one of the rollers 84 to rotate through the speed reducer, and then the annular chain 851 is engaged with each chain wheel, thereby realizing the synchronous and same-direction rotation of all the rollers 84, and ensuring the stable conveying of the transformer 12.

[0078] The moving mechanism 5 comprises a servo motor 51, a gear (not shown in the figure), a rack (not shown in the figure), an upper linear guide groove 52, a lower linear guide groove 53, a lower linear guide rail 54, two rollers 55, two upper guide columns 56 and two lower guide columns 57. The upper linear guide groove 52 and the lower linear guide groove 53 are respectively installed on the upper edge and the lower edge of the outer side wall of the vacuum box 3 and are parallel to each other. The lower linear guide rail 54 is installed on the lower edge of the outer side wall of the vacuum box 3 and is inside the lower linear guide groove 53 and parallel to the lower linear guide groove 53. The moving door 4 is between the upper linear guide groove 52 and the lower linear guide groove 53. Two wheel shafts 41 perpendicular to the width direction of the moving door 4 are fixedly arranged on the lower edge of the moving door 4. The length of the wheel shaft 41 is greater than the thickness of the roller 55. The two rollers 55 are respectively rotatably installed on the corresponding wheel shaft 41 and can move along the axial direction of the corresponding wheel shaft 41. The two rollers 55 are both on the lower linear guide rail 54 and can move along the lower linear guide rail 54. The two lower guide columns 57 are both installed on the lower edge of the moving door 4 and can move along the lower linear guide groove 53. The two upper guide columns 56 are both installed on the upper edge of the moving door 4 and can move along the upper linear guide groove 52. Two lower guide notches 531 corresponding to the lower guide columns 57 are arranged on the inner groove wall of the lower linear guide groove 53. A lower moving space 532 for the lower guide columns 57 to move is arranged between the lower linear guide groove 53 and the lower linear guide rail 54. The lower moving space 532 is communicated with the lower linear guide groove 53 through the two lower guide notches 531. Two upper guide notches 521 corresponding to the upper guide columns 56 are arranged on the inner groove wall of the upper linear guide groove 52. An upper moving space 522 for the upper guide columns 56 to move in and out is arranged between the upper linear guide groove 52 and the moving door 4. The upper moving space 522 is communicated with the upper linear guide groove 52 through the two upper guide notches 521. The servo motor 51 is installed on the moving door 4. The gear is installed on the power output shaft of the servo motor 51. The rack is installed on the lower edge of the outer side wall of the vacuum box 3 and extends along the length direction of the lower linear guide groove 53. The rack is engaged with the gear.

[0079] The sealing driving mechanism 9 is a push-pull mechanism 91 and a clamping piece 92. The clamping piece 92 is installed on the moving door 4 and is buckled with the power output end of the push-pull mechanism 91. When the moving door 4 corresponds to the entrance and exit 33, the push-pull mechanism 91 can drive the moving door 4 to move away or close to the entrance and exit 33, so as to realize sealing or separation. The edge of the entrance and exit 33 is provided with an annular sealing surface 331. The annular sealing surface 331 is provided with an annular sealing ring 332 matched with the moving door 4.

[0080] The push-pull mechanism 91 comprises two left push-pull units 911 and two right push-pull units 912, the two left push-pull units 911 are respectively installed on the left side of the corresponding entrance 33, the two right push-pull units 912 are respectively installed on the right side of the corresponding entrance 33, the left side of the moving door 4 is provided with a left limiting notch 42 matched with the left push-pull unit 911, the right side of the moving door 4 is provided with a right limiting notch 43 matched with the right push-pull unit 912; the left limiting notch 42 and the right limiting notch 43 constitute the clamping piece 92.

[0081] When the moving door 4 is in the open position, the left push-pull unit 911 and the right push-pull unit 912 are in the extended state, the left push-pull unit 911 and the right push-pull unit 912 are in the waiting alignment position with the limiting notch of the moving door 4; the upper guide column 56 is in the upper straight guide groove 52, the lower guide column 57 is in the lower straight guide groove 53, and the roller 55 is on the lower straight guide rail 54. When the moving door 4 is to be closed, the servo motor 51 is started and drives the gear to rotate, the gear is engaged with the rack fixed outside the vacuum box 3, the rotary motion is converted into linear driving force, and the moving door 4 is moved along the horizontal direction to the entrance 33; during the movement of the moving door 4, the upper guide column 56 slides along the upper straight guide groove 52, the lower guide column 57 slides along the lower straight guide groove 53, and the roller 55 rolls along the lower straight guide rail 54, which cooperates to ensure the straightness of the translation of the moving door 4 and avoids deviation; when the left and right limiting notches 43 of the moving door 4 are aligned with the output ends of the left and right push-pull units 912, the servo motor 51 stops working, and the moving door 4 is translated to be in position (at this time, the moving door 4 is just preliminarily aligned with the entrance 33, but does not contact with the annular sealing ring 332 on the edge of the entrance 33).

[0082] When the mobile door 4 is translated in place, the left limiting gap 42 of the mobile door 4 is buckled with the output end of the left push-pull unit 911, and the right limiting gap 43 of the mobile door 4 is buckled with the output end of the right push-pull unit 912. Then, the left push-pull unit 911 and the right push-pull unit 912 are started. The lower guide column 57 enters the lower moving space 532 through the lower guide gap 531 of the lower linear guide groove 53 with the initial action of the left push-pull unit 911 and the right push-pull unit 912; the upper guide column 56 enters the upper moving space 522 through the upper guide gap 521 of the upper linear guide groove 52 (the two upper guide columns 56 and the two lower guide columns 57 are switched from "translation guide" to "compression guide", and the mobile door 4 has the freedom of transverse (perpendicular to the translation direction) movement, which prepares for the mobile door 4 to fit the annular sealing ring 332); then, the left push-pull unit 911 and the right push-pull unit 912 continue to act on the left and right edges of the mobile door 4 to exert a transverse pulling force, so that the inner surface edge of the mobile door 4 is tightly fitted on the edge of the access 33 through the annular sealing ring 332, so that the mobile door 4 is fully fitted with the sealing surface of the access 33 without local looseness or pressure concentration, so that the vacuum box 3 forms a sealed space.

[0083] The left push-pull unit 911 and the right push-pull unit 912 each include a push-pull seat 9111, a push-pull oil cylinder 9112, and two limiting rings 9113. The push-pull seat 9111 is installed on the outer side wall of the vacuum box 3, the push-pull oil cylinder 9112 is installed on the push-pull seat 9111, the piston rod of the push-pull oil cylinder 9112 extends towards the direction of the mobile door 4 and is perpendicular to the inner surface of the mobile door 4, and the two limiting rings 9113 are fixedly installed on the end of the piston rod of the push-pull oil cylinder 9112, and the limiting clamping groove 9114 is formed between the two limiting rings 9113. Each limiting clamping groove 9114 is buckled with the corresponding left limiting gap 42 and right limiting gap 43. When the mobile door 4 is closed, the left limiting gap 42 of the mobile door 4 is buckled with the limiting clamping groove 9114 of the left push-pull unit 911, and the right limiting gap 43 of the mobile door 4 is buckled with the limiting clamping groove 9114 of the right push-pull unit 912, so that the piston rod of the push-pull oil cylinder 9112 is rigidly connected with the mobile door 4, and the pulling force is directly applied to the edge of the mobile door 4, which provides a prerequisite for the mobile door 4 to fully fit the sealing surface of the access 33, forcibly makes the mobile door 4 accurately cooperate with the sealing surface of the access 33, ensures that the mobile door 4 is completely aligned with the sealing surface, and avoids sealing misalignment.

[0084] The left limiting block 44 is arranged on the left side edge of the movable door 4, and the left limiting gap 42 is arranged on the left limiting block 44, and the opening of the left limiting gap 42 faces right. The right limiting block 45 is arranged on the right side edge of the movable door 4, and the right limiting gap 43 is arranged on the right limiting block 45, and the opening of the right limiting gap 43 faces right. The left limiting block 44 and the right limiting block 45 provide rigid support for the edge of the movable door 4, so as to avoid deformation of the edge of the heavy movable door 4 due to the gap.

[0085] The position detection component 6 is a plurality of position sensors 61, each of which is arranged on the inner wall of the vacuum box 3 along the conveying direction of the receiving conveying roller way 34, and each of which is above the receiving conveying roller way 34. The number of position sensors 61 is the same as that of oil injection pipes 32, and each position sensor 61 is electrically connected to the corresponding signal input end of the controller. The position sensor 61 is used to detect whether the transformer 12 reaches the receiving conveying roller way 34 and corresponds to the corresponding oil injection pipe 32, and provides a trigger signal for the opening and closing of the movable door 4 and the overturning of the second roller frame 82.

[0086] The vacuum box 3 is provided with a visual monitoring unit 35 and an oil injection manipulator (not shown in the figure) capable of clamping the oil injection pipe 32 and inserting the lower end of the oil injection pipe 32 into the oil injection port of the transformer 12 through lifting and translation. The visual monitoring unit 35 is arranged on the inner wall of the vacuum box 3, and the shooting end of the visual monitoring unit 35 faces the receiving conveying roller way 34. The visual monitoring unit 35 is electrically connected to the corresponding signal input end of the controller, and the oil injection manipulator is electrically connected to the corresponding signal output end of the controller. The position sensor 61 can only realize rough positioning of the transformer 12, the visual monitoring unit 35 can capture the specific position of the oil injection port of the transformer 12 in real time (including horizontal deviation and angular deviation), and feed back the coordinate data to the controller; the oil injection manipulator clamps the oil injection pipe 32 according to the data, adjusts the posture through lifting and translation, and accurately inserts the lower end of the oil injection pipe 32 into the oil injection port. The above-mentioned oil injection manipulator is a prior art, and therefore will not be described here. The above-mentioned visual monitoring unit generally includes a camera and an image processing system, the camera has high resolution and is only used to capture the slight position deviation of the oil injection port and feed back the position data in real time, which belongs to the prior art and will not be described here.

[0087] The staged vacuum pumping unit 10 is connected between the side interface of the vacuum box 3 and the side interface of the oil storage tank 1; the staged vacuum pumping unit 10 comprises a Roots pump 101, a rough vacuum pump 102, a fine vacuum pump 103, a first vacuum valve 104, a second vacuum valve 105, a third vacuum valve 106, a fourth vacuum valve 107, an oil storage vent valve 109, an oil injection vent valve 110, a low vacuum gauge and a high vacuum gauge; the side interface of the vacuum box 3 is connected with the first vacuum valve 104, the Roots pump 101, the second vacuum valve 105 and the rough vacuum pump 102 in sequence through a first pipeline 112; the side interface of the oil storage tank 1 is connected on the first pipeline 112 between the first vacuum valve 104 and the Roots pump 101 through a second pipeline 113, and the oil storage vent valve 109 and the third vacuum valve 106 are arranged on the second pipeline 113; the first pipeline 112 between the Roots pump 101 and the second vacuum valve 105 is connected with the fourth vacuum valve 107 and the fine vacuum pump 103 in sequence through a third pipeline 114; the low vacuum gauge is arranged in the inner cavity of the vacuum box 3, and the high vacuum gauge is arranged on the first pipeline 112 between the first vacuum valve 104 and the Roots pump 101; the top of the oil storage tank 1 is provided with an oil inlet valve 108, and the oil injection vent valve 110 is arranged on the side of the vacuum box 3; the signal output ends of the low vacuum gauge and the high vacuum gauge are electrically connected with the corresponding signal input ends of the controller respectively, and the Roots pump 101, the rough vacuum pump 102, the fine vacuum pump 103, the first vacuum valve 104, the second vacuum valve 105, the third vacuum valve 106, the fourth vacuum valve 107, the oil inlet valve 108, the oil storage vent valve 109 and the oil injection vent valve 110 are electrically connected with the corresponding signal output ends of the controller respectively.

[0088] The staged vacuum pumping unit 10 further comprises a condenser 111 connected on the first pipeline 112 between the first vacuum valve 104 and the Roots pump 101; the bottom of the condenser 111 is provided with a first liquid discharge port 1111, and the first liquid discharge port 1111 is provided with a first on-off valve 1112. When the vacuumizing is performed, the air extracted will enter the condenser 111, and the condenser 111 will condense the water vapor and oil vapor in the air into liquid, which can be discharged from the first liquid discharge port 1111 by opening the first on-off valve 1112 in the later period, so as to prevent the water vapor and oil vapor from polluting the Roots pump 101, the rough vacuum pump 102 and the fine vacuum pump 103, and prolong the service life of the equipment (the first on-off valve 1112 needs to be closed before the equipment is started).

[0089] The oil outlet of the oil pump 2 is connected with the corresponding oil inlet 31 of the vacuum box 3 through the multi-way oil injection flow monitoring unit 20; the oil injection flow monitoring unit 20 comprises a flow meter 201 and a control valve 202, and the oil outlet of the oil pump 2 is connected with the control valve 202, the flow meter 201 and the corresponding oil inlet 31 at the top of the vacuum box 3 in sequence through the fourth pipeline 115; the flow meter 201 is electrically connected with the corresponding signal input end of the controller, and the control valve 202 is electrically connected with the corresponding signal output end of the controller. The flow meter 201 displays the oil injection flow (unit: L / H) corresponding to the transformer 12 in real time, the oil injection speed can be accurately controlled by adjusting the opening degree of the control valve 202, the oil injection rhythm of the transformer 12 with different capacities can meet the process requirements, and the internal component damage caused by oil impact can be avoided.

[0090] The grading vacuumizing unit 10 performs the grading vacuumizing and oil injection steps as follows:

[0091] (1) Sealing preparation for feeding: the transformers 12 to be injected with oil are transported into the vacuum box 3, the lower end of the oil injection pipe 32 is inserted into the oil injection port of the transformer 12, the moving door 4 is closed to ensure that the vacuum box 3 is completely sealed, and the oil injection break valve 110 of the vacuum box 3, the oil inlet valve 108 and the oil storage break valve 109 of the oil storage tank 1 are closed;

[0092] (2) Grading vacuumizing

[0093] (2-1) Low-vacuum rough pumping stage: the first vacuumizing valve 104, the third vacuumizing valve 106 and the second vacuumizing valve 105 are opened, and the rough vacuum pump 102 is started; the pressure in the vacuum box 3 is monitored through the low-vacuum gauge, and the pressure in the oil storage tank 1 is monitored synchronously through the high-vacuum gauge, until the pressures in the two places are both reduced to 100 Pa or less, and the rough vacuumizing is completed;

[0094] (2-2) High-vacuum fine pumping stage: the second vacuumizing valve 105 is closed, the fourth vacuumizing valve 107 (branch of the fine vacuum pump 103) is opened, and the Roots pump 101 and the fine vacuum pump 103 are started; the pressures in the vacuum box 3 and the oil storage tank 1 are monitored through the high-vacuum gauge (mainly monitoring the oil storage tank 1) and the low-vacuum gauge (auxiliary monitoring the vacuum box 3) in coordination, until the pressures in the vacuum box 3 and the oil storage tank 1 are both ≤10 Pa, and the high-vacuum process requirement is reached;

[0095] (3) According to the capacity of the transformer 12, the controller matches and starts the corresponding oil injection flow monitoring unit 20, and opens the control valve 202 of the oil injection flow monitoring unit 20; then the oil pump 2 is started, the oil inlet valve 108 of the oil storage tank 1 is slowly opened, and the insulating oil is pumped into the transformer 12 in the vacuum box 3 after being measured by the corresponding oil injection flow monitoring unit 20;

[0096] (4) Oil injection completion and air breaking: after the oil injection is completed, the oil injection pump 2, the oil inlet valve 108 of the oil tank 1 and the oil injection flow monitoring unit 20 are closed; the oil tank 1 air breaking valve 109 is slowly opened first, so that the pressure in the oil tank 1 returns to normal pressure, and then the oil injection air breaking valve 110 of the vacuum tank 3 is slowly opened (to avoid the sudden change of the tank pressure causing the oil to splash); after the pressure in the vacuum tank 3 returns to normal pressure, the mobile door 4 is opened to transport the transformer 12 out.

[0097] The bottom of the vacuum tank 3 is provided with a second liquid discharge port 36, and the second liquid discharge port 36 is provided with a second switch valve 37. When the oil injection is completed, the liquid in the vacuum tank 3 can be discharged from the second liquid discharge port 36 by opening the second switch valve 37 (the second switch valve 37 needs to be closed before the equipment starts).

[0098] The embodiment also includes a rotating mechanism 30, a detection conveying unit 60 and an unqualified rejection mechanism 50. The rotating mechanism 30 is arranged on one side of the first roller frame 81 of the reversible conveying mechanism 8 as an output end. The detection conveying unit 60 is installed on the power output end of the rotating mechanism 30. The detection platform 11 is above the detection conveying unit 60. The detection conveying unit 60 is provided with a qualified outlet 601 and an unqualified rejection port 602. The rear conveying roller 39 is connected with the qualified outlet 601, and the unqualified rejection mechanism 50 is connected with the unqualified rejection port 602. The above-mentioned receiving conveying roller 34, the detection conveying unit 60 and the unqualified rejection mechanism 50 are all power-driven conveying mechanisms. The power-driven conveying mechanisms and the rotating mechanism 30 are all prior art, and thus will not be described here.

[0099] In addition, it should be noted that the specific embodiments described in the specification can have different names and the like, and any equivalent or simple changes made according to the structure, features and principles of the present application are included in the protection scope of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the structure of the present application or exceed the scope defined by the present claims, and should belong to the protection scope of the present application.

Claims

1. A transformer vacuum oil injection detection continuous production line, comprising an oil storage tank, an oil pump, a vacuum box, two movable doors and two moving mechanisms, the top of the vacuum box is provided with a plurality of oil inlet ports, the inner cavity of the vacuum box is provided with a plurality of oil injection pipes connected with the oil inlet ports correspondingly, the oil outlet of the oil storage tank is communicated with the oil inlet ports through the oil pump; the opposite two side walls of the vacuum box are provided with entrances and exits for the transformer, the two movable doors are respectively matched with the corresponding entrances and exits and are movably installed on the outer side walls of the vacuum box, and the two moving mechanisms are used for driving the corresponding movable doors to translate; the front and rear of the vacuum box are respectively provided with a front conveying roller way and a rear conveying roller way, the inner cavity of the vacuum box is provided with a receiving conveying roller way, and each oil injection pipe is located above the receiving conveying roller way; characterized in that: The controller, the position detection component, the two sets of limit detection components, the two reversible conveying mechanisms, the two sealing driving mechanisms, the hierarchical vacuum pumping unit and the detection platform are further included. The two reversible conveying mechanisms are respectively arranged corresponding to the two entrances of the vacuum box, and are used for realizing the continuous conveying of the transformer through the butt joint conveying of the front conveying roller, the rear conveying roller and the receiving conveying roller, and avoiding the translation of the moving door. The position detection component is arranged in the inner cavity of the vacuum box, and is used for detecting the in-place state of the transformer on the receiving conveying roller and adapting to the oil injection pipe. The two sets of limit detection components are respectively arranged corresponding to the two entrances and the two reversible conveying mechanisms, and are used for detecting the opening and closing state of the corresponding moving door, controlling the upward or downward turning of the reversible conveying mechanism, and detecting the upward turning in-place state of the reversible conveying mechanism. The two sealing driving mechanisms are used for driving the corresponding moving door to be sealed and attached to the entrance. The hierarchical vacuum pumping unit is used for simultaneously performing hierarchical vacuum pumping on the vacuum box and the oil storage tank. The detection platform is arranged at the rear end of the rear conveying roller, and is used for detecting the insulation performance and the oil injection standard state performance of the transformer after oil injection. The signal output ends of the position detection component and the limit detection component are electrically connected with the signal input end of the controller, and the moving mechanism, the sealing driving mechanism, the reversible conveying mechanism, the hierarchical vacuum pumping unit, the oil pump and the detection platform are electrically connected with the signal output end of the controller.

2. The continuous production line for transformer vacuum oil injection and detection according to claim 1, characterized in that: The reversible conveying mechanism comprises a first roller frame, a second roller frame and a turning driving mechanism.

3. The continuous production line for transformer vacuum oil-filling inspection according to claim 2, characterized in that: The turning driving mechanism comprises a hydraulic oil pump, a turning oil cylinder, a swing arm and a rotation stopping block. The hydraulic oil pump is installed at the bottom of the first roller frame. The cylinder body of the turning oil cylinder is hinged to the inner end side wall of the first roller frame, and the turning oil cylinder is connected with the hydraulic oil pump. The piston rod end of the turning oil cylinder is hinged to the outer end side wall of the second roller frame. The swing arm is above the turning oil cylinder. The outer end of the swing arm is hinged to the inner end side wall of the first roller frame. The rotation stopping block is installed on the outer end edge of the swing arm. The rotation stopping block is correspondingly matched with the limit detection component. The hydraulic oil pump is electrically connected with the corresponding signal output end of the controller.

4. The continuous production line for transformer vacuum oil-filling inspection according to claim 3, characterized in that: The limiting detection component includes two door opening to position proximity switches, two door closing to position proximity switches and two turnover limiting switches; the door opening to position proximity switch and the door closing to position proximity switch are installed on one side of the corresponding entrance and exit, the turnover limiting switch is installed on the first roller frame side wall of the turnover conveying mechanism, and the rotation stopping block is correspondingly matched with the turnover limiting switch; the signal output ends of the two door opening to position proximity switches, the two door closing to position proximity switches and the two turnover limiting switches are electrically connected with the corresponding signal input ends of the controller.

5. The transformer vacuum oil filling inspection continuous production line according to claim 1, characterized in that: The moving mechanism includes a servo motor, a gear, a rack, an upper straight guide slot, a lower straight guide slot, a lower straight guide rail, two rollers, two upper guide columns and two lower guide columns; the upper straight guide slot and the lower straight guide slot are respectively installed on the upper edges and the lower edges of the outer side walls of the vacuum box and are parallel to each other; the lower straight guide rail is installed on the lower edge of the outer side wall of the vacuum box and is inside the lower straight guide slot and parallel to the lower straight guide slot; the moving door is between the upper straight guide slot and the lower straight guide slot, two wheel shafts perpendicular to the width direction of the moving door are fixedly arranged on the lower edge of the moving door, the length of the wheel shafts is greater than the thickness of the rollers, the two rollers are rotatably installed on the corresponding wheel shafts and can move along the axial direction of the corresponding wheel shafts, the two rollers are on the lower straight guide rail and can move along the lower straight guide rail, the two lower guide columns are installed on the lower edge of the moving door and can move along the lower straight guide slot, the two upper guide columns are installed on the upper edge of the moving door and can move along the upper straight guide slot; two lower guide notches corresponding to the corresponding lower guide columns are arranged on the inner groove wall of the lower straight guide slot, a lower moving space for the lower guide columns to move is arranged between the lower straight guide slot and the lower straight guide rail, and the lower moving space communicates with the lower straight guide slot through the two lower guide notches; two upper guide notches corresponding to the corresponding upper guide columns are arranged on the inner groove wall of the upper straight guide slot, and an upper moving space for the upper guide columns to move in and out is arranged between the upper straight guide slot and the moving door, and the upper moving space communicates with the upper straight guide slot through the two upper guide notches; the servo motor is installed on the moving door, the gear is installed on the power output shaft of the servo motor, and the rack is installed on the lower edge of the outer side wall of the vacuum box and extends along the length direction of the lower straight guide slot, and the rack is engaged with the gear.

6. The transformer vacuum oil injection detection continuous production line of claim 1, wherein: the sealing driving mechanism is a push-pull mechanism and a clamping piece, the clamping piece is installed on the moving door, and the clamping piece is buckled with the power output end of the push-pull mechanism; when the moving door corresponds to the entrance and exit, the push-pull mechanism can drive the moving door to move away or close to the entrance and exit, so as to realize sealing or separation; the edge of the entrance and exit is provided with an annular sealing surface, and the annular sealing surface is provided with an annular sealing ring matched with the moving door. The push-pull mechanism comprises two left push-pull units and two right push-pull units, the two left push-pull units are respectively installed on the left side edges of the corresponding entrances, the two right push-pull units are respectively installed on the right side edges of the corresponding entrances, the left side edges of the movable door are provided with left limiting notches matched with the left push-pull units, and the right side edges of the movable door are provided with right limiting notches matched with the right push-pull units; the left limiting notches and the right limiting notches form the clamping member; The left push-pull unit and the right push-pull unit each comprise a push-pull seat, a push-pull oil cylinder and two limiting rings, the push-pull seat is installed on the outer side wall of the vacuum box, the push-pull oil cylinder is installed on the push-pull seat, the piston rod of the push-pull oil cylinder extends towards the direction of the movable door and is perpendicular to the inner surface of the movable door, the two limiting rings are fixedly installed on the end of the piston rod of the push-pull oil cylinder, and a limiting clamping groove is formed between the two limiting rings; each limiting clamping groove is matched with the corresponding left limiting notch and right limiting notch.

7. The continuous production line for detecting transformer vacuum oil injection according to claim 1, wherein: The position detection component is a plurality of position sensors, each position sensor is arranged on the inner wall of the vacuum box along the conveying direction of the receiving conveying roller way at equal intervals, and each position sensor is above the receiving conveying roller way; the position sensors are the same in number as the oil injection pipes and one-to-one corresponding, and each position sensor is electrically connected with the corresponding signal input end of the controller; The vacuum box is provided with a visual monitoring unit and an oil injection manipulator capable of clamping the oil injection pipe and inserting the lower end of the oil injection pipe into the transformer oil injection port through lifting and translation, the visual monitoring unit is arranged on the inner wall of the vacuum box, and the shooting end of the visual monitoring unit faces the receiving conveying roller way; the visual monitoring unit is electrically connected with the corresponding signal input end of the controller, and the oil injection manipulator is electrically connected with the corresponding signal output end of the controller.

8. The continuous production line for transformer vacuum oil-filling inspection according to claim 1, characterized in that: The hierarchical vacuum pumping unit is connected between the side interface of the vacuum box and the side interface of the oil storage tank; the hierarchical vacuum pumping unit comprises a Roots pump, a rough vacuum pump, a fine vacuum pump, a first vacuum valve, a second vacuum valve, a third vacuum valve, a fourth vacuum valve, an oil storage vent valve, an oil injection vent valve, a low vacuum gauge and a high vacuum gauge; the side interface of the vacuum box is connected with the first vacuum valve, the Roots pump, the second vacuum valve and the rough vacuum pump in sequence through a first pipeline; the side interface of the oil storage tank is connected on the first pipeline between the first vacuum valve and the Roots pump through a second pipeline, and the oil storage vent valve and the third vacuum valve are arranged on the second pipeline; the first pipeline between the Roots pump and the second vacuum valve is connected with the fourth vacuum valve and the fine vacuum pump in sequence through a third pipeline; the low vacuum gauge is arranged in the inner cavity of the vacuum box, and the high vacuum gauge is arranged on the first pipeline between the first vacuum valve and the Roots pump; the top of the oil storage tank is provided with an oil inlet valve, and the oil injection vent valve is arranged on the side of the vacuum box; the signal output ends of the low vacuum gauge and the high vacuum gauge are electrically connected with the corresponding signal input ends of the controller, and the Roots pump, the rough vacuum pump, the fine vacuum pump, the first vacuum valve, the second vacuum valve, the third vacuum valve, the fourth vacuum valve, the oil inlet valve, the oil storage vent valve and the oil injection vent valve are electrically connected with the corresponding signal output ends of the controller.

9. The continuous production line for vacuum impregnation of transformers as claimed in claim 8, characterized in that: The hierarchical vacuum pumping unit further comprises a condenser, which is connected on the first pipeline between the first vacuum valve and the Roots pump; the bottom of the condenser is provided with a first liquid discharge port, and the first liquid discharge port is provided with a first on-off valve.

10. The continuous production line for detecting vacuum oil injection of a transformer according to claim 1, wherein: The oil outlet of the oil pump is connected with the corresponding oil inlet of the vacuum box through a plurality of oil injection flow monitoring units; the oil injection flow monitoring unit comprises a flow meter and a control valve, and the oil outlet of the oil pump is connected with the control valve, the flow meter and the corresponding oil inlet at the top of the vacuum box in sequence through a fourth pipeline; the flow meter is electrically connected with the corresponding signal input end of the controller, and the control valve is electrically connected with the corresponding signal output end of the controller; The bottom of the vacuum box is provided with a second liquid discharge port, and the second liquid discharge port is provided with a second on-off valve; Further comprising a rotating mechanism, a detection conveying unit and an unqualified rejection mechanism, the rotating mechanism is arranged on one side of the first roller frame of the reversible conveying mechanism as an output end, the detection conveying unit is installed on the power output end of the rotating mechanism, the detection platform is above the detection conveying unit, the detection conveying unit is provided with a qualified outlet and an unqualified rejection port, the rear conveying roller is butted with the qualified outlet, and the unqualified rejection mechanism is butted with the unqualified rejection port.

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