Automatic vacuum defoaming device for instrument transformer potting material

Abstract

The invention discloses an automatic vacuum defoaming device for instrument transformer potting materials, and relates to the technical field of transformer potting production, the automatic vacuum defoaming device comprises a feeding conveying assembly and a vacuum chamber, a middle conveying assembly is arranged in the vacuum chamber, the feeding conveying assembly is arranged outside the vacuum chamber, and the middle conveying assembly is arranged in the middle of the vacuum chamber. The feeding conveying assembly is used for conveying turnover boxes to the middle conveying assembly, a vacuum pump is arranged outside the vacuum chamber and used for vacuumizing the vacuum chamber, a vacuum pressure relief electromagnetic valve is arranged at the communicating position of the vacuum chamber and the outside, and a hot air defoaming assembly is further arranged outside the vacuum chamber. The hot air defoaming assembly is used for providing hot air flow for the vacuum chamber after pressure relief; according to the automatic vacuum defoaming device, the circulating process of vacuumizing, pressure releasing and hot air blowing can be carried out in the vacuum chamber, automatic defoaming is carried out on an instrument transformer potting material, the product quality is improved, and the labor cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer potting production, and in particular relates to an automatic vacuum defoaming device for instrument transformer potting material. Background Art

[0002] An instrument transformer is a special transformer used in electrical measurement, control, and protection systems. Its core function is to convert high voltage or high current into low voltage or low current proportionally to facilitate instrument measurement, relay operation, and control system operation. At the same time, it achieves electrical isolation between high-voltage circuits and low-voltage control circuits to ensure the safety of personnel and equipment.

[0003] Due to the high reliability requirements for instrument transformers and a lifespan of more than 16 years, polyurethane potting compounds are currently commonly used to prevent high temperature and humidity from affecting the transformer lifespan. During the potting process, the cured polyurethane curing agent is very sensitive to moisture and water vapor. Upon contact with the active ingredient, it will produce carbon dioxide, which in turn easily forms bubbles in the potting compound. Therefore, eliminating bubbles in the potting compound has become a key process. Currently, vacuum degassing and manual defoaming with a defoaming agent are commonly used. Manual defoaming generally requires several defoaming cycles, with frequent inspections and defoaming until the potting compound solidifies. This generally leads to the risk of incomplete defoaming, low production efficiency, and high labor intensity, resulting in high production costs and low pass rates. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic vacuum defoaming device for instrument transformer potting material with a simple structure and reasonable design in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] An automatic vacuum defoaming device for instrument transformer potting material comprises a feed conveying assembly and a vacuum chamber, wherein an intermediate conveying assembly is provided in the vacuum chamber, the feed conveying assembly is provided outside the vacuum chamber, the feed conveying assembly is used to convey the turnover box to the intermediate conveying assembly, a vacuum pump is provided outside the vacuum chamber, the vacuum pump is used to evacuate the vacuum chamber, a vacuum pressure relief solenoid valve is provided at the connection between the vacuum chamber and the outside world, a hot air defoaming assembly is further provided outside the vacuum chamber, the hot air defoaming assembly is used to provide a hot air flow to the vacuum chamber after pressure relief.

[0007] As a further optimization scheme of the present invention, the hot air defoaming component includes an air dryer, a hot air blower and a guide plate. The output end of the air dryer is connected to the input end of the hot air blower. A guide plate is fixedly arranged in the vacuum chamber, and the guide plate divides the vacuum chamber into two upper and lower areas. The intermediate conveying component is arranged in the area below the guide plate. The area of ​​the vacuum chamber above the guide plate is a hot air cavity. The output end of the hot air blower is connected to the hot dry air input port opened on the vacuum chamber through a pipe, and the hot dry air input port is connected to the hot air cavity, wherein a hot dry air switch solenoid valve is provided on the pipe connected to the output end of the hot air blower.

[0008] As a further optimization scheme of the present invention, a feed baffle is provided at the feed port of the vacuum chamber, and the feed baffle is fixedly connected to the driving end of the first telescopic driving member. The first telescopic driving member is used to control the opening and closing state of the feed baffle relative to the feed port. A discharge baffle is provided at the discharge port of the vacuum chamber, and the discharge baffle is fixedly connected to the driving end of the second telescopic driving member. The second telescopic driving member is used to control the opening and closing state of the discharge baffle relative to the discharge port.

[0009] As a further optimization scheme of the present invention, a second position sensor and a second material blocking assembly are also provided in the vacuum chamber. Along the conveying direction of the turnover box, the second material blocking assembly is located on the side of the second position sensor away from the feeding port. The driving parts of the second position sensor and the second material blocking assembly are respectively electrically connected to the PLC controller. When the PLC controller receives the detection signal of the second position sensor, the PLC controller is used to control the second material blocking assembly to block the turnover box on the intermediate conveying assembly, and the PLC controller is also used to control the intermediate conveying assembly to stop conveying.

[0010] As a further optimization scheme of the present invention, a first position sensor and a first material stop assembly are provided on one side of the feed conveying assembly. Along the conveying direction of the turnover box, the first position sensor is located in front of the first material stop assembly, and the distance between the first position sensor and the first material stop assembly is greater than the length dimension value of the turnover box. The driving parts of the first position sensor and the first material stop assembly are respectively electrically connected to the PLC controller. When the PLC controller receives the detection signal of the first position sensor, the PLC controller is used to control the first material stop assembly to block the turnover box behind.

[0011] As a further optimization solution of the present invention, a discharge conveying assembly is further provided outside the vacuum chamber, and along the conveying direction, the discharge conveying assembly is provided on a side of the vacuum chamber away from the feed conveying assembly.

[0012] As a further optimization scheme of the present invention, the first material blocking assembly includes a first conical roller, a second conical roller, a correction motor and a shift assembly, the rotation axis of the first conical roller is consistent with the rotation axis of the second conical roller, and the rotation axis is perpendicular to the conveying direction of the turnover box, wherein the first conical roller and the second conical roller are respectively small inside and large outside structures, the output end of the correction motor is transmission-connected to the first conical roller, and the shift assembly is used to control the first conical roller and the second conical roller to switch between the obstruction position and the initial position; when the first conical roller and the second conical roller are in the obstruction position, the small diameter end of the first conical roller and the small diameter end of the second conical roller are plugged in.

[0013] As a further optimization scheme of the present invention, the shift assembly includes a third telescopic drive member, a fourth telescopic drive member and a base, the base is fixedly arranged on the mounting seat in the feed conveying assembly, the third telescopic drive member and the fourth telescopic drive member are respectively arranged on the base, the output end of the third telescopic drive member is transmission-connected to a support, a correction motor is mounted on the support, the output end of the fourth telescopic drive member is transmission-connected to a sleeve shaft frame, the large diameter end of the second conical roller is fixedly connected to a transition shaft, and the transition shaft is rotatably connected to the sleeve shaft frame at one end away from the second conical roller.

[0014] As a further optimization scheme of the present invention, the automatic vacuum defoaming device also includes a limiting component. Along the conveying direction, the limiting component is arranged in front of the first conical roller and the second conical roller. The limiting component is used to directionally convey the corrected turnover box from the feed conveyor belt to the intermediate conveyor belt in the intermediate conveying component.

[0015] As a further optimization scheme of the present invention, the limiting assembly includes a conveyor belt, a card block, a support plate and a boss. The bosses are fixedly provided on both sides of the turnover box, and a plurality of card slots are opened above the bosses. The conveyor belt is sleeved on the conveyor roller, and the conveyor roller is mounted on the mounting frame. The mounting frame is fixed on the mounting seat. The outer surface of the conveyor belt is fixed with a plurality of card blocks. The support plate is fixed on the mounting frame, and the support plate is located above the descending conveyor belt, and the support plate is frictionally contacted with the descending conveyor belt, wherein the card block on the descending conveyor belt is correspondingly engaged with the card slot.

[0016] The present invention has at least the following beneficial effects: the automatic vacuum defoaming device for potting material of an instrument transformer provided by the present invention evacuates a sealed vacuum chamber by a vacuum pump, so that the instrument transformer after potting is in a vacuum state, so that the bubbles in the potting compound expand and rise to the surface of the potting compound, and then the pressure in the vacuum chamber is restored to atmospheric pressure by the control of the vacuum pressure relief solenoid valve, and then the hot air flow provided by the hot air defoaming component is used to blow away the bubbles on the surface to achieve defoaming. The whole process is completed automatically, saving labor costs and material costs, and improving production efficiency and product quality.

[0017] When the first material stop assembly blocks the rear turnover box, the fourth telescopic drive member and the third telescopic drive member are activated to move the first tapered roller and the second tapered roller toward each other to the blocking position. When the rear turnover box is conveyed in an inclined state, along the conveying direction, if the friction driving force of the second tapered roller at the rounded corner position on one side of the turnover box is less than the friction driving force of the first tapered roller at the rounded corner position on the other side of the turnover box, the turnover box is subjected to a lateral combined force to one side, so that the turnover box is gradually corrected until the friction driving force of the second tapered roller at the rounded corner position on one side is equal to the friction driving force of the first tapered roller at the rounded corner position on the other side, thereby correcting the tilt.

[0018] In addition, when the turnover box is continued to be conveyed forward after correction, the boss is relatively fixed and constrained between the conveyor belt and the feed conveyor belt through the engagement of the block on the conveyor belt and the slot on the boss. In the process of the turnover box extending out of the feed conveyor belt and gradually extending into the middle conveyor belt, the turnover box always remains in a horizontal and centered state, and will not be horizontally offset due to the turnover box transportation process, or even sag due to the weight of the turnover box at the suspended end extending out of the feed conveyor belt, resulting in the deviation of the potting material. This ensures that after the turnover box is transported into the vacuum chamber, it always remains in a horizontal and centered state when receiving hot air blowing, which can ensure that the liquid level of the potting material of the transformer loaded inside it is stable and evenly receives hot air blowing, thereby ensuring the defoaming efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 The present invention Figure 1 A schematic diagram of a front cross-sectional structure;

[0021] Figure 3 It is a front structural schematic diagram of the feed conveying assembly, the first material blocking assembly, the turnover box and the limit assembly of the present invention;

[0022] Figure 4 It is a side structural schematic diagram of the first material blocking assembly of the present invention when it is located at the material blocking position;

[0023] Figure 5 It is a partial top view of the structure of the present invention when the first material blocking assembly is located at the material blocking position during tilted conveyance of the turnover box;

[0024] Figure 6 This invention Figure 3 Enlarged view of point A in the middle;

[0025] Figure 7This is a diagram showing the matching of the position limiting assembly and the turnover box of the present invention;

[0026] Figure 8 It is a partial front structural schematic diagram of the feed conveying assembly, turnover box, limit assembly and intermediate conveying assembly of the present invention.

[0027] In the figure: 1. Feed conveyor assembly; 101. Feed conveyor belt; 102. Mounting seat; 2. First material stopper assembly; 3. Turnover box; 301. Boss; 302. Slot; 4. First position sensor; 5. Intermediate conveyor assembly; 51. Intermediate conveyor belt; 6. Feed port; 7. Guide plate; 8. Feed baffle; 9. Hot dry air inlet; 10. First telescopic drive member; 11. Second telescopic drive member; 12. Discharge baffle; 13. Second position sensor; 14. Second material stopper assembly; 15. Discharge port. 16. Discharge conveying assembly; 17. Air dryer; 18. Vacuum pressure relief solenoid valve; 19. Hot air blower; 20. Hot dry air switch solenoid valve; 21. Vacuum pump; 22. Vacuum chamber; 23. Hot air chamber; 31. Base; 32. Third telescopic drive member; 33. Support; 34. Correction motor; 35. First conical roller; 36. Second conical roller; 37. Transition shaft; 38. Sleeve bracket; 39. Fourth telescopic drive member; 310. Conveyor belt; 311. Block; 312. Back plate; 313. Mounting frame. DETAILED DESCRIPTION

[0028] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] Example 1

[0030] like Figure 1 and Figure 2 As shown, the present invention provides an automatic vacuum defoaming device for instrument transformer potting material, comprising a feed conveying component 1 and a vacuum chamber 22, wherein an intermediate conveying component 5 is provided in the vacuum chamber 22, and the feed conveying component 1 is arranged outside the vacuum chamber 22, and the feed conveying component 1 is used to convey the turnover box 3 to the intermediate conveying component 5, and a vacuum pump 21 is provided outside the vacuum chamber 22, and the vacuum pump 21 is used to evacuate the vacuum chamber 22, and a vacuum pressure relief solenoid valve 18 is provided at the connection between the vacuum chamber 22 and the outside world, and a hot air defoaming component is further provided outside the vacuum chamber 22, and the hot air defoaming component is used to provide a hot air flow to the vacuum chamber 22 after the pressure is released.

[0031] The sealed vacuum chamber 22 is evacuated by a vacuum pump 21, so that the potting material of the instrument transformer is in a vacuum state, causing the bubbles in the potting compound to expand and rise to the surface of the potting compound. Then, the pressure in the vacuum chamber 22 is restored to atmospheric pressure by opening the vacuum pressure relief solenoid valve 18. The hot air flow provided by the hot air defoaming component is then used to blow away the bubbles on the surface to achieve defoaming. The entire process is completed automatically, saving labor and material costs and improving production efficiency and product quality. It should be noted that in order to further improve the defoaming effect, the above-mentioned action can be repeated multiple times. The number of times is set according to the amount of potting compound and the amount of bubbles generated by the potting compound itself, which is not limited here.

[0032] For example, see Figure 1 and Figure 2 The hot air defoaming component includes an air dryer 17, a hot air blower 19 and a guide plate 7. The output end of the air dryer 17 is connected to the input end of the hot air blower 19, so that the air sucked in by the hot air blower 19 is dried by the air dryer 17, thereby reducing the moisture in the air and avoiding the contact of the potting glue with the conventional air humidity to aggravate the generation of bubbles. The guide plate 7 is fixedly provided in the vacuum chamber 22. The guide plate 7 divides the vacuum chamber 22 into two upper and lower areas. The middle conveying component 5 is provided in the lower area of ​​the guide plate 7. The area of ​​the vacuum chamber 22 above the guide plate 7 is the hot air cavity 23. The output end of the hot air blower 19 is connected to the hot air cavity 23 through a pipeline. The hot dry air input port 9 opened on the vacuum chamber 22 is connected, and the hot dry air input port 9 is connected to the hot air cavity 23, wherein a hot dry air switch solenoid valve 20 is provided on the pipe connected to the output end of the hot air blower 19. After the vacuum chamber 22 is evacuated and the pressure is released, the hot air blower 19 is turned on and the hot dry air switch solenoid valve 20 is opened, so that the hot air is continuously transported to the hot air cavity 23 through the hot dry air input port 9. Under the guiding action of the guide plate 7, the guide holes on the guide plate 7 evenly diffuse the hot air into the area below the guide plate 7, and blow away the bubbles on the surface of the potting glue, so as to avoid uneven defoaming caused by direct blowing due to high local blowing temperature and strong blowing force.

[0033] For example, see Figure 2 A feed baffle 8 is provided at the feed port 6 of the vacuum chamber 22, and the feed baffle 8 is fixedly connected to the driving end of the first telescopic driving member 10. The first telescopic driving member 10 is used to control the opening and closing state of the feed baffle 8 relative to the feed port 6. A discharge baffle 12 is provided at the discharge port 15 of the vacuum chamber 22, and the discharge baffle 12 is fixedly connected to the driving end of the second telescopic driving member 11. The second telescopic driving member 11 is used to control the opening and closing state of the discharge baffle 12 relative to the discharge port 15.

[0034] It should be noted that the first telescopic drive member 10 is a hydraulic telescopic cylinder or an electric telescopic cylinder, which is not limited here. The first telescopic drive member 10 can drive the feed baffle 8 to move up and down to control the opening and closing state of the feed port 6, which is not limited here. Similarly, the second telescopic drive member 11 is a hydraulic telescopic cylinder or an electric telescopic cylinder, which is not limited here. The second telescopic drive member 11 can drive the discharge baffle 12 to move up and down to control the opening and closing state of the discharge port 15; when the turnover box 3 needs to be transported from the feed conveying assembly 1 to the intermediate conveying assembly 5, it is necessary to control the feed baffle 8 to move up through the first telescopic drive member 10 to open the vacuum chamber 22, and before evacuating the vacuum chamber 22, it is necessary to control the feed baffle 8 to move down to close the feed port 6 and control the discharge baffle 12 to move down to close the discharge port 15 to ensure the closed state of the vacuum chamber 22.

[0035] For example, see Figure 2 The vacuum chamber 22 is further provided with a second position sensor 13 and a second blocking assembly 14, which are arranged along the conveying direction of the turnover box 3 (such as Figure 1 and Figure 2 The second material blocking component 14 is located on the side of the second position sensor 13 away from the feed port 6, and the driving parts of the second position sensor 13 and the second material blocking component 14 are electrically connected to the PLC controller respectively. When the PLC controller receives the detection signal of the second position sensor 13, the PLC controller is used to control the second material blocking component 14 to block the turnover box 3 on the intermediate conveying component 5, and the PLC controller is also used to control the intermediate conveying component 5 to stop conveying.

[0036] It should be noted that the second material blocking assembly 14 includes a hydraulic telescopic cylinder and a blocking rod. When the intermediate conveying assembly 5 conveys the turnover box 3, it moves to the turnover box 3 to block the second position sensor 13, so that the detection signal of the second position sensor 13 is transmitted to the PLC controller. The PLC controller then controls the hydraulic telescopic cylinder to shift the blocking rod to the front of the turnover box 3 to prevent the turnover box 3 from continuing to move forward. Then the PLC controller controls the intermediate conveying assembly 5 to stop conveying until the potting material of the instrument transformer in the turnover box 3 is defoamed and then conveyed again, thereby avoiding directly stopping the intermediate conveying assembly 5, causing the turnover box 3 to cause the potting glue to deflect due to the forward inertia of conveying, resulting in secondary entrapment of bubbles.

[0037] In other embodiments, the second material blocking assembly 14 includes a rotating motor and a rocker arm. The intermediate conveying assembly 5 conveys the turnover box 3 to move until the turnover box 3 blocks the second position sensor 13, so that the detection signal of the second position sensor 13 is transmitted to the PLC controller. The PLC controller then controls the rotating motor to swing the rocker arm down to the front of the turnover box 3 to prevent the turnover box 3 from continuing to move forward. Then the PLC controller controls the intermediate conveying assembly 5 to stop conveying until the potting material of the instrument transformer in the turnover box 3 is defoamed and then conveyed again. This is not limited here.

[0038] For example, see Figure 2 A first position sensor 4 and a first stop assembly 2 are provided on one side of the feed conveying assembly 1. Along the conveying direction of the turnover box 3, the first position sensor 4 is located in front of the first stop assembly 2, and the distance between the first position sensor 4 and the first stop assembly 2 is greater than the length dimension of the turnover box 3. The driving parts of the first position sensor 4 and the first stop assembly 2 are electrically connected to the PLC controller respectively. When the turnover box 3 is conveyed to block the first position sensor 4 and the PLC controller receives the detection signal of the first position sensor 4, the PLC controller is used to control the first stop assembly 2 to block the turnover box 3 at the rear, so that during the process of the feed conveying assembly 1 conveying the turnover box 3 in front to the intermediate conveying assembly 5 and the process of the turnover box 3 undergoing defoaming operation in the vacuum chamber 22, the turnover box 3 at the rear will not continue to move forward, thereby ensuring the independent operation of the turnover box 3.

[0039] Exemplarily, the first material blocking assembly 2 includes an electric cylinder and a blocking rod, which blocks the turnover box 3 at the rear.

[0040] like Figure 2 As shown, a discharge conveying assembly 16 is further provided outside the vacuum chamber 22, and along the conveying direction, the discharge conveying assembly 16 is arranged on the side of the vacuum chamber 22 away from the feed conveying assembly 1 to move the turnover box 3 loaded with the defoamed instrument transformer out of the vacuum chamber 22.

[0041] It should be noted that the turnover box 3 loaded with the transformer after defoaming is sent to an oven, a curing furnace or a tunnel-type curing line, and heated according to the curing parameters (temperature, time) of the potting glue so that the potting glue is cured and forms a stable insulation and sealing structure. It will not be elaborated here.

[0042] Example 2

[0043] Based on the technical solution of Example 1, continue to refer to Figure 3 、 Figure 4 and Figure 5The first material-blocking assembly 2 includes a first tapered roller 35, a second tapered roller 36, a correction motor 34 and a shift assembly. The rotation axis of the first tapered roller 35 is consistent with the rotation axis of the second tapered roller 36, and the rotation axis is perpendicular to the conveying direction of the turnover box 3. The first tapered roller 35 and the second tapered roller 36 are respectively small inside and large outside structures. The output end of the correction motor 34 is transmission-connected to the first tapered roller 35, and the shift assembly is used to control the first tapered roller 35 and the second tapered roller 36 to switch between the obstruction position and the initial position; when the first tapered roller 35 and the second tapered roller 36 are in the obstruction position, the small diameter end of the first tapered roller 35 and the small diameter end of the second tapered roller 36 are plugged in.

[0044] like Figure 4 As shown, the first tapered roller 35 and the second tapered roller 36 are in the blocking position. When the PLC controller receives the detection signal of the first position sensor 4, the PLC controller controls the first tapered roller 35 and the second tapered roller 36 to be in the blocking position through the shift component, that is, the small diameter end of the first tapered roller 35 and the small diameter end of the second tapered roller 36 are plugged in. At this time, the correction motor 34 drives the first tapered roller 35, so that the second tapered roller 36 rotates synchronously. Figure 4 The middle dashed line indicates the rear turnover box 3 conveyed by the feed conveyor belt 101 in the feed conveyor assembly 1. The four corners of the rectangular turnover box 3 are all rounded. When the turnover box 3 is conveyed up in the center, the rounded corners in front of the turnover box 3 frictionally abut against the first tapered roller 35 and the second tapered roller 36 respectively. That is, the turnover box 3 is subjected to symmetrical frictional abutment forces by the first tapered roller 35 and the second tapered roller 36 respectively, so that the turnover box 3 is blocked in a centered state and waits to be released;

[0045] like Figure 5 As shown in the figure, the dotted line indicates that the turnover box 3 at the rear is tilted and transported up by the feed conveyor 101. At this time, under the transport of the feed conveyor 101, the rounded corners of the front of the tilted turnover box 3 are respectively in friction contact with the first tapered roller 35 and the second tapered roller 36, Figure 5 It can be seen that along the conveying direction, the rotation radius of the second tapered roller 36 at the friction contact position between the left rounded corner and the second tapered roller 36 is smaller than the rotation radius of the first tapered roller 35 at the friction contact position between the right rounded corner and the first tapered roller 35, so that the friction driving force of the second tapered roller 36 at the rounded corner position on the left is smaller than the friction driving force of the first tapered roller 35 at the rounded corner position on the right, so that the turnover box 3 is subjected to a leftward lateral resultant force, so that the turnover box 3 is gradually straightened until the friction driving force of the second tapered roller 36 at the rounded corner position on the left is the same as the friction driving force of the first tapered roller 35 at the rounded corner position on the right, thereby correcting the tilt.

[0046] It should be noted that the small inside and large outside means that the large diameter end of the tapered roller is far away from the center line, and the small diameter end is close to the center line. The center line refers to the symmetry line of the feed conveyor belt 101, that is, the first tapered roller 35 and the second tapered roller 36 are symmetrically arranged along the center line.

[0047] For example, see Figure 3 、 Figure 4 and Figure 5 The shifting assembly includes a third telescopic driving member 32, a fourth telescopic driving member 39 and a base 31. The base 31 is fixedly arranged on the mounting base 102 in the feed conveying assembly 1. The third telescopic driving member 32 and the fourth telescopic driving member 39 are respectively arranged on the base 31. The output end of the third telescopic driving member 32 is transmission-connected to the support 33, and the correction motor 34 is mounted on the support 33. The output end of the fourth telescopic driving member 39 is transmission-connected to the sleeve frame 38. The large diameter end of the second tapered roller 36 is fixedly connected to the transition shaft 37, and the end of the transition shaft 37 away from the second tapered roller 36 is rotatably connected to the sleeve frame 38.

[0048] When the rear turnover box 3 needs to be blocked, the third telescopic driving member 32 drives the support 33 to move left, and the fourth telescopic driving member 39 drives the sleeve shaft frame 38 to move right, so that the first tapered roller 35 and the second tapered roller 36 move toward each other until the small diameter end of the first tapered roller 35 is plugged into the small diameter end of the second tapered roller 36. Figure 4 As shown, the first tapered roller 35 and the second tapered roller 36 are located in the obstruction position. At this time, starting the correction motor 34 can realize the synchronous rotation of the first tapered roller 35 and the second tapered roller 36. During the rotation, the transition shaft 37 is rotationally connected to the sleeve shaft frame 38.

[0049] It should be noted that the third telescopic driving member 32 and the fourth telescopic driving member 39 are both electric cylinders or hydraulic telescopic cylinders, which are not limited here.

[0050] Exemplarily, the automatic vacuum defoaming device also includes a limiting component, which is arranged in front of the first conical roller 35 and the second conical roller 36 along the conveying direction. The limiting component is used to directionally convey the corrected turnover box 3 from the feed conveyor belt 101 to the intermediate conveyor belt 51 in the intermediate conveying component 5.

[0051] Continue reading Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 and Figure 8The limiting assembly includes a conveyor belt 310, a card block 311, a support plate 312 and a boss 301. Bosses 301 are fixedly provided on both sides of the turnover box 3. A plurality of card slots 302 are provided above the boss 301. The conveyor belt 310 is sleeved on the conveyor roller. The input end of the conveyor roller is connected to a transmission motor to drive the conveyor roller to drive the conveyor belt 310 to rotate counterclockwise (in degrees). Figure 3 The conveyor belt 310 is rotated by rotating the conveyor roller on the mounting frame 313, and the mounting frame 313 is fixedly set on the mounting seat 102. A plurality of card blocks 311 are fixedly set on the outer surface of the conveyor belt 310, and the support plate 312 is fixedly set on the mounting frame 313, and the support plate 312 is located above the downward conveyor belt 310, and the support plate 312 is in friction contact with the downward conveyor belt 310, wherein the card block 311 on the downward conveyor belt 310 is correspondingly engaged with the card slot 302.

[0052] It should be noted that the downward conveyor belt 310 is the counterclockwise rotating conveyor belt 310, wherein the portion moving from left to right is the upward conveyor belt 310, and similarly, the portion moving from right to left is the upward conveyor belt 310, wherein the conveying speed of the conveyor belt 310 is consistent with the conveying speed of the feed conveyor belt 101;

[0053] In the above embodiment, after the turnover box 3 has been corrected by the first tapered roller 35 and the second tapered roller 36, it continues to be transported forward under the conveyance of the feed conveyor belt 101. At this time, the bosses 301 on both sides of the turnover box 3 pass along the lower area of ​​the downward conveyor belt 310. At this time, the blocking blocks 311 on the conveyor belt 310 are stuck in the blocking grooves 302, and under the abutment of the supporting plate 312, the conveyor belt 310 abuts the blocking blocks 311 and is squeezed into the blocking grooves 302, so that the bosses 301 are relatively fixed and constrained between the conveyor belt 310 and the feed conveyor belt 101, so as to ensure that the turnover box 3 is stably transported forward.

[0054] Moreover, if Figure 2 As shown, in order to ensure that the feed baffle 8 moves down and seals the vacuum chamber 22 smoothly, the feed conveying assembly 1 and the intermediate conveying assembly 5 are disconnected, and space is left for the feed baffle 8 to move down, as shown in FIG. Figure 8As shown, in the process of the turnover box 3 being transported from the feed conveyor belt 101 to the intermediate conveyor belt 51, the boss 301 is fixedly constrained by the conveyor belt 310, so that the turnover box 3 always maintains a horizontal and centered state in the process of extending out of the feed conveyor belt 101 and gradually extending into the intermediate conveyor belt 51. The turnover box 3 will not be horizontally offset during the transportation process of the turnover box 3, and even the turnover box 3 will sag at the suspended end extending out of the feed conveyor belt 101 due to its own weight, resulting in a deviation of the potting material. Therefore, when the turnover box 3 is transported in the manner of the present application, after entering the vacuum chamber 22, when receiving hot air blowing, the turnover box 3 always maintains a horizontal and centered state, which can ensure that the liquid level of the potting material of the transformer loaded therein is stable and evenly receives hot air blowing, thereby ensuring the defoaming efficiency and quality.

[0055] It should be noted that, when the automatic vacuum defoaming device is in use, the feed port 6 and the discharge port 15 of the vacuum chamber 22 are in an open state, and a plurality of turnover boxes 3 are conveyed on the feed conveyor belt 101. After the first position sensor 4 detects the signal of the turnover box 3, the PLC controller controls the first blocking component 2 to block the turnover box 3 at the rear, and conveys the turnover box 3 to the intermediate conveyor belt 51 in the vacuum chamber 22 under the continuous conveyance of the feed conveyor belt 101. Then, the first telescopic driving member 10 is started to move the feed baffle 8 downward, and the second telescopic driving member 11 is started to move the discharge baffle 12 downward, so that the vacuum chamber 22 is in a closed state. Moreover, after the intermediate conveyor belt 51 conveys the turnover box 3 and moves it to the position where the second position sensor 13 detects the position signal of the turnover box 3, the PLC controller controls the second blocking component 14 to block the turnover box 3 and stops the intermediate conveying component 5.

[0056] Then, the vacuum pump 21 is started to evacuate the vacuum chamber 22 and maintain the pressure for the set time. After the set time is up, the vacuum pressure relief solenoid valve 18 is opened to release the pressure in the vacuum chamber 22 to restore the atmospheric pressure. Then the PLC controller controls to start the air dryer 17 and the hot air blower 19, so that the air dried by the air dryer 17 is conveyed to the hot air cavity 23 by the hot air blower 19, and the heat flow is evenly diffused through the guide plate 7 to blow the potting material of the instrument transformer in the turnover box 3 located in the area below the guide plate 7 to achieve defoaming. The staff can rotate and repeat the above-mentioned vacuuming, pressure relief, and hot air defoaming actions according to the defoaming situation until the defoaming is complete. After the defoaming is completed, the feed baffle 8 and the discharge baffle 12 can be opened, and the intermediate conveying assembly 5 can be restarted to move the turnover box 3 out of the vacuum chamber 22 and convey the new turnover box 3 into the vacuum chamber 22.

[0057] Among them, when the first blocking assembly 2 blocks the rear turnover box 3, by starting the fourth telescopic driving member 39 and the third telescopic driving member 32, the first tapered roller 35 and the second tapered roller 36 move toward each other to the blocking position. When the rear turnover box 3 is conveyed in an inclined state, as shown in FIG. Figure 5 As shown, along the conveying direction, the friction driving force of the second tapered roller 36 at the rounded corner on the left front side of the turnover box 3 is smaller than the friction driving force of the first tapered roller 35 at the rounded corner on the right front side of the turnover box 3, so that the turnover box 3 is subjected to a lateral force to the left, so that the turnover box 3 is gradually straightened until the friction driving force of the second tapered roller 36 at the rounded corner on the left side is equal to the friction driving force of the first tapered roller 35 at the rounded corner on the right side, thereby correcting the tilt;

[0058] When the turnover box 3 is further conveyed forward after the deviation is corrected, the boss 301 is relatively fixed and constrained between the conveyor belt 310 and the feed conveyor belt 101 through the engagement of the block 311 on the conveyor belt 310 and the slot 302 on the boss 301. In the process of the turnover box 3 extending out of the feed conveyor belt 101 and gradually extending into the intermediate conveyor belt 51, the turnover box 3 always remains in a horizontal and centered state, and will not be horizontally offset due to the transportation process of the turnover box 3, or even sag due to the weight of the turnover box 3 at the suspended end extending out of the feed conveyor belt 101, resulting in a deviation of the potting material. Therefore, when the turnover box 3 is conveyed in the manner of the present application, after entering the vacuum chamber 22, when receiving hot air blowing, the turnover box 3 always remains in a horizontal and centered state, which can ensure that the potting material liquid level of the transformer loaded therein is stable and evenly receives hot air blowing, thereby ensuring the defoaming efficiency and quality.

[0059] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. An automatic vacuum defoaming device for instrument transformer potting material, characterized in that: The invention comprises a feeding conveying component (1) and a vacuum chamber (22), wherein an intermediate conveying component (5) is arranged in the vacuum chamber (22), and the feeding conveying component (1) is arranged outside the vacuum chamber (22). The feeding conveying component (1) is used to convey the turnover box (3) to the intermediate conveying component (5). A vacuum pump (21) is arranged outside the vacuum chamber (22), and the vacuum pump (21) is used to evacuate the vacuum chamber (22). A vacuum pressure relief electromagnetic valve (18) is arranged at the connection point between the vacuum chamber (22) and the outside world. A hot air defoaming component is also arranged outside the vacuum chamber (22), and the hot air defoaming component is used to provide a hot air flow to the vacuum chamber (22) after pressure relief.

2. The automatic vacuum defoaming device for instrument transformer potting material according to claim 1, characterized in that: The hot air defoaming component includes an air dryer (17), a hot air blower (19) and a guide plate (7). The output end of the air dryer (17) is connected to the input end of the hot air blower (19). The guide plate (7) is fixedly arranged in the vacuum chamber (22). The guide plate (7) divides the vacuum chamber (22) into two upper and lower areas. The intermediate conveying component (5) is arranged in the area below the guide plate (7). The area of ​​the vacuum chamber (22) located above the guide plate (7) is a hot air cavity (23). The output end of the hot air blower (19) is connected to the hot dry air input port (9) opened on the vacuum chamber (22) through a pipeline. The hot dry air input port (9) is connected to the hot air cavity (23). A hot dry air switch solenoid valve (20) is provided on the pipeline connected to the output end of the hot air blower (19).

3. The automatic vacuum defoaming device for instrument transformer potting material according to claim 2, characterized in that: A feed baffle (8) is provided at the feed port (6) of the vacuum chamber (22), the feed baffle (8) being fixedly connected to the driving end of a first telescopic driving member (10), and the first telescopic driving member (10) being used to control the opening and closing state of the feed baffle (8) relative to the feed port (6); a discharge baffle (12) is provided at the discharge port (15) of the vacuum chamber (22), the discharge baffle (12) being fixedly connected to the driving end of a second telescopic driving member (11), and the second telescopic driving member (11) being used to control the opening and closing state of the discharge baffle (12) relative to the discharge port (15).

4. The automatic vacuum defoaming device for instrument transformer potting material according to claim 3, characterized in that: A second position sensor (13) and a second material blocking assembly (14) are also provided in the vacuum chamber (22). Along the conveying direction of the turnover box (3), the second material blocking assembly (14) is located on a side of the second position sensor (13) away from the feed port (6). The driving parts of the second position sensor (13) and the second material blocking assembly (14) are respectively electrically connected to the PLC controller. When the PLC controller receives a detection signal from the second position sensor (13), the PLC controller is used to control the second material blocking assembly (14) to block the turnover box (3) on the intermediate conveying assembly (5), and the PLC controller is also used to control the intermediate conveying assembly (5) to stop conveying.

5. The automatic vacuum defoaming device for instrument transformer potting material according to claim 4, characterized in that: A first position sensor (4) and a first material blocking assembly (2) are provided on one side of the feed conveying assembly (1); along the conveying direction of the turnover box (3), the first position sensor (4) is located in front of the first material blocking assembly (2); and the distance between the first position sensor (4) and the first material blocking assembly (2) is greater than the length dimension value of the turnover box (3); the driving parts of the first position sensor (4) and the first material blocking assembly (2) are respectively electrically connected to the PLC controller; when the PLC controller receives the detection signal of the first position sensor (4), the PLC controller is used to control the first material blocking assembly (2) to block the turnover box (3) behind.

6. The automatic vacuum defoaming device for instrument transformer potting material according to claim 5, characterized in that: A discharge conveying assembly (16) is further provided outside the vacuum chamber (22), and along the conveying direction, the discharge conveying assembly (16) is provided on a side of the vacuum chamber (22) away from the feed conveying assembly (1).

7. The automatic vacuum defoaming device for instrument transformer potting material according to claim 6, characterized in that: The first material-blocking assembly (2) includes a first tapered roller (35), a second tapered roller (36), a deviation-correcting motor (34) and a shifting assembly, wherein the rotation axis of the first tapered roller (35) is consistent with the rotation axis of the second tapered roller (36), and the rotation axis is perpendicular to the conveying direction of the turnover box (3), wherein the first tapered roller (35) and the second tapered roller (36) are respectively small inside and large outside structures, the output end of the deviation-correcting motor (34) is transmission-connected with the first tapered roller (35), and the shifting assembly is used to control the first tapered roller (35) and the second tapered roller (36) to switch between the obstruction position and the initial position; when the first tapered roller (35) and the second tapered roller (36) are in the obstruction position, the small diameter end of the first tapered roller (35) and the small diameter end of the second tapered roller (36) are plugged in.

8. The automatic vacuum defoaming device for instrument transformer potting material according to claim 7, characterized in that: The shift assembly comprises a third telescopic drive member (32), a fourth telescopic drive member (39) and a base (31), wherein the base (31) is fixedly arranged on a mounting seat (102) in the feed conveying assembly (1), and the third telescopic drive member (32) and the fourth telescopic drive member (39) are respectively arranged on the base (31), the output end of the third telescopic drive member (32) is transmission-connected to a support (33), a deviation correction motor (34) is arranged on the support (33), the output end of the fourth telescopic drive member (39) is transmission-connected to a sleeve shaft frame (38), the large-diameter end of the second tapered roller (36) is fixedly connected to a transition shaft (37), and the end of the transition shaft (37) away from the second tapered roller (36) is rotationally connected to the sleeve shaft frame (38).

9. The automatic vacuum defoaming device for instrument transformer potting material according to claim 8, characterized in that: The automatic vacuum defoaming device further comprises a limiting assembly, which is arranged in front of the first tapered roller (35) and the second tapered roller (36) along the conveying direction, and the limiting assembly is used to directionally convey the turnover box (3) after deviation correction from the feed conveyor belt (101) to the intermediate conveyor belt (51) in the intermediate conveyor assembly (5).

10. The automatic vacuum defoaming device for instrument transformer potting material according to claim 9, characterized in that: The limiting assembly comprises a conveyor belt (310), a clamping block (311), a support plate (312) and a boss (301); bosses (301) are fixedly provided on both sides of the turnover box (3); a plurality of clamping slots (302) are provided above the bosses (301); the conveyor belt (310) is sleeved on a conveyor roller, which is mounted on a mounting frame (313); the mounting frame (313) is fixedly provided on a mounting seat (102); a plurality of clamping blocks (311) are fixedly provided on the outer surface of the conveyor belt (310); the support plate (312) is fixedly provided on the mounting frame (313); the support plate (312) is located above the descending conveyor belt (310), and the support plate (312) is in frictional contact with the descending conveyor belt (310); wherein the clamping blocks (311) on the descending conveyor belt (310) are correspondingly clamped with the clamping slots (302).

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