Automatic polishing device and polishing method for corners of metal plate of box-type substation

Abstract

The invention discloses an automatic polishing device and method for corners of a metal plate of a box-type substation, and relates to the technical field of box polishing. The box-type substation metal plate corner automatic grinding device comprises a grinding belt, a polygonal structure is defined by the grinding belt through belt wheels, one edge of the polygonal structure serves as a grinding edge, a right-angle frame is located in the polygonal structure, the field angle of the right-angle frame is aligned with the grinding edge, and a compensation structure is located in the polygonal structure. The device is used for compensating the deformation quantity of the polished edge converted into the right-angle edge. Through the arrangement of the right-angle frame and the extension frame, the right-angle frame serves as a right-angle table for the grinding belt to form right-angle edge grinding, the compensation structure is used for compensating the deformation quantity needed by converting the grinding edge of the grinding belt into the right-angle edge, and therefore when the grinding belt is subjected to the corner pressure of the box-type substation metal plate, the grinding edge of the grinding belt can be attached to the right-angle table; the device is tightly attached to the corners of the metal plate of the box-type substation, and friction type grinding work is conducted on the corners of the metal plate in a right-angle driving mode.

Description

Technical Field

[0001] The present invention relates to the technical field of box grinding, and specifically to an automatic grinding device and grinding method for the sheet metal corners of a box-type substation. Background Art

[0002] A box-type substation is an integrated power equipment that realizes efficient and flexible power conversion and distribution through modular design, and is widely used in fields such as residential, transportation, industry, and mining. A box-type substation mainly consists of a high-voltage chamber, a transformer chamber, and a low-voltage chamber. The electrical components in each chamber are usually loaded and supported by equipment such as incoming line cabinets, outgoing line cabinets, metering cabinets, and ring main units. Most of the boxes that make up the box-type substation are produced by a process of sheet metal bending and welding. After the box preparation is completed, due to the presence of weld scars, burrs, etc. on its corners, it is necessary to grind them and make the "R" corners of the corners smoother.

[0003] For example, in the Chinese patent with the publication number CN114505748A, a grinding device for the internal corners and sheet metal corners of a box is disclosed. When such a device grinds the sheet metal corners of a box, the grinding machine is started to make the grinding head start to work, and the motor is controlled to drive the X-axis sliding plate to move on the cross beam through a screw rod. Then the Y-axis push rod is started to control the movement of the grinding machine on the Y-axis. Then the Z-axis push rod is started to make the grinding machine move up and down, and further control the movement of the grinding machine on the Z-axis. The three cooperate to complete the positioning of the grinding position of the box.

[0004] However, the existing method of using three-way displacement of the grinding head component to complete the grinding of the sheet metal corners of the box requires sequentially controlling the displacement grinding of both sides of the sheet metal corner and the sheet metal R corner by the grinding head to complete the grinding work of the sheet metal corner. Its corner grinding is relatively single and limited. While taking a long time, the smoothness quality of the corner grinding is relatively low, and the grinding smoothness effect is not ideal. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides an automatic grinding device and grinding method for the sheet metal corners of a box-type substation, which solves the problems raised in the background art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: an automatic grinding device and grinding method for the sheet metal corners of a box-type substation.

[0007] On the one hand, the present invention provides an automatic grinding device for the sheet metal corners of a box-type substation, comprising: a grinding belt, the grinding belt is wound into a polygonal structure by a pulley, and one of the sides of the polygonal structure is used as a grinding edge; a right-angle frame, the right-angle frame is located in the polygonal structure, the angle of the right-angle frame is aligned with the grinding edge, and the use of the sheet metal corner of the box-type substation to apply pressure to the grinding edge can make the grinding edge fit on the right-angle frame, so that the grinding edge forms a right-angle edge, and the right-angle edge applies pressure to the sheet metal corner of the box-type substation and grinds it; a compensation structure, the compensation structure is located in the polygonal structure, and is used to compensate for the deformation of the grinding edge converted into a right-angle edge.

[0008] Furthermore, the right-angle frame is aligned with the middle of the polishing edge, and the right-angle frame is provided with two sets of extension frames that are staggered and overlapped with it along the extension direction of its side plate; the compensation structure includes a compensation component, which is provided on the right-angle side of the right-angle frame and is used to drive the extension frame away from or close to the right-angle frame. The extension frame and the right-angle frame form a right-angle platform with adjustable size.

[0009] Furthermore, the pulley includes a driving pulley and two driven pulleys, which form a triangular structure of the grinding belt, with a grinding edge between the two driven pulleys; the compensation component is also used to drive the driven pulley and the driving pulley to move synchronously with the extension frame to compensate for the elongation or shortening of the grinding belt surface close to the right-angle platform, so that the grinding belt is concave to the right-angle platform when it contacts the corners of the box-type substation.

[0010] Furthermore, it also includes: a first conveyor belt, which is provided in two groups and is staggered on the two side plates of the right-angle frame; a second conveyor belt, which is provided in two groups and is staggered with the first conveyor belt and is provided on the extension frame, and rotates simultaneously with the first conveyor belt. When the grinding belt is transformed into a right angle by the pressure of the sheet metal corners of the box-type substation, it contacts the first conveyor belt and the second conveyor belt.

[0011] Furthermore, it also includes: a second driven shaft, the second driven shaft is arranged at a right angle to the right-angle frame, and is coaxial with the two groups of first conveyor belts; a second prismatic driven shaft, the second prismatic driven shaft is arranged on the moving path of the extension frame, and is meshed with the second driven shaft through a third bevel gear pair, the second prismatic driven shaft is provided with a fourth bevel gear pair along its axial sliding, and the fourth bevel gear pair is coaxial with the second conveyor belt, so that when the second conveyor belt moves relative to the first conveyor belt, the second conveyor belt and the first conveyor belt always keep synchronous rotation.

[0012] Further, the compensation component includes a first displacement structure for driving the extension bracket and the driven pulley to move synchronously, and a second displacement structure for driving the driving pulley to move synchronously with the driven pulley. Among them, the first displacement structure includes: a first lead screw, with two sets of first lead screws, two in each set, and the two sets of first lead screws are arranged on the two right-angled sides of the right-angled frame at a 90-degree angle. A first nut sleeve is arranged along the axial direction of the first lead screw; a first bracket is arranged on the first nut sleeve. The threaded force of the first lead screw is horizontally transmitted to the first nut sleeve to push the first bracket to move. The first bracket is fixedly connected to the extension bracket and is rotatably connected to the driven pulley.

[0013] Further, the second displacement structure includes: a second lead screw, which is arranged away from the first lead screw in the right-angled direction of the right-angled frame. A second nut sleeve is arranged along the axial direction of the second lead screw, and a side support frame is arranged at the other end of the second nut sleeve; a second bracket is arranged on the second nut sleeve. The threaded force of the second lead screw is horizontally transmitted to the second nut sleeve to push the second bracket to move. The second bracket is fixedly connected to the second nut sleeve through the side support frame and is rotatably connected to the driving pulley.

[0014] Further, the second displacement structure further includes: a screw rod, which is arranged on one side of the side support frame and is at least one set. A screw sleeve is arranged along the axial direction of the screw rod; a compression spring can be sleeved on the screw rod. The compression spring is fixedly connected to the second bracket and is rotatably connected to the screw sleeve. When the screw sleeve moves along the screw rod, it applies or releases elastic storage capacity to the compression spring; a guiding sliding sleeve is arranged on the displacement path of the second nut sleeve. A guide rod is slidably connected inside the guiding sliding sleeve. The guide rod penetrates through the side support frame, the screw rod and is fixedly connected to the second bracket. When the guide rod slides along the guiding sliding sleeve, it applies rotational limit to the displacement of the side support frame and applies guiding limit to the displacement of the second bracket.

[0015] Further, the compensation component further includes a driving bevel gear arranged between the first lead screw and the second lead screw. Among them, the driving bevel gear meshes with a first driven bevel gear arranged at one end of the first lead screw, and the driving bevel gear meshes with a second driven bevel gear arranged at the other end of the second lead screw, so that the first lead screw and the second lead screw rotate synchronously.

[0016] On the other hand, the present invention also provides an automatic grinding method for the sheet metal corners of a box-type substation, including the following steps: Step 1: According to the size of the corners to be ground of the box-type substation, control the extension bracket to move away from or close to the right-angled frame so that the two form a right-angled table of a suitable size. Step 2: Place the box-type substation on the grinding platform and make the corners to be ground opposite to the right angle of the right-angled frame. Then adjust the orientations of the first right-angled plate and the second right-angled plate so that they are attached to the two side plates of the corners of the box-type substation to apply limit to it. Then control the pressing plate to apply pressure to the box-type substation to position the box-type substation at three points. Step 3: Driven by the second electric rod, push the right-angle frame and the right-angle table of the extension frame towards the corner of the box-type substation and press them against the corner. At this time, the grinding belt is concave inward due to the resistance of the corner of the box-type substation, so that its outer grinding surface closely adheres to the corner of the box-type substation, and its inner driving surface closely adheres to the right-angle table and fits with the first conveyor belt and the second conveyor belt; Step 4: Control the rotation of the grinding belt so that the grinding contact part runs along the track of the right-angle table to perform close grinding on the corner of the box-type substation. Driven by the first electric rod, push the grinding belt to move up and down and move along the corner line of the box-type substation to comprehensively grind its corner. While the grinding belt is running, drive the first conveyor belt and the second conveyor belt to rotate synchronously to reduce the frictional resistance of the grinding belt in the right-angle table, and at the same time apply a stall thrust to the grinding belt.

[0017] The present invention has the following beneficial effects: (1) For the automatic grinding device for the sheet metal corners of the box-type substation, through the setting of the right-angle frame and the extension frame, a right-angle table for forming a right-angle edge grinding of the grinding belt is formed, and a compensation structure is used to compensate for the deformation amount required for the grinding edge of the grinding belt to be transformed into a right-angle edge. When the grinding belt is under the pressure of the sheet metal corner of the box-type substation, its grinding edge can be made to adhere to the right-angle table, closely adhere to the sheet metal corner of the box-type substation, and perform frictional grinding work on the sheet metal corner in a right-angle driving manner. Its corner grinding is more comprehensive, the grinding smoothness effect is better, and the grinding efficiency is faster and more efficient.

[0018] (2) For the automatic grinding device for the sheet metal corners of the box-type substation, through the setting of the compensation structure, on the one hand, it can drive the extension frame to move telescopically relative to the right-angle frame to form right-angle table structures of different sizes to adapt to the sheet metal corners of different box-type substations. On the other hand, it can drive the driven pulley and the driving pulley to move synchronously with the extension frame, so that the belt surface of the grinding belt close to the right-angle table can be elongated or shortened, compensating for the deformation amount required for the grinding belt to be concave into the right-angle table when contacting the corner of the box-type substation, so that the grinding belt maintains a suitable right-angle size and fits closely to the corner of the box-type substation to perform precise grinding operations.

[0019] (3) For the automatic grinding device for the sheet metal corners of the box-type substation, through the synchronous transmission characteristics of the first conveyor belt and the second conveyor belt along the right-angle table, when the grinding belt is concave into the right-angle table for grinding work, it contacts the first conveyor belt and the second conveyor belt, and uses the synchronous drive of the first conveyor belt and the second conveyor belt. On the one hand, it reduces the relative frictional force between the grinding belt and the right-angle table. On the other hand, when the grinding belt tends to stall due to excessive grinding intensity, a thrust is applied to the grinding belt to maintain the grinding drive state of the grinding belt.

[0020] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above advantages. Description of the Drawings

[0021] Figure 1 is the structural schematic diagram of the present invention; Figure 2 is the partial structure schematic Figure 1 ; Figure 3 is the partial structure schematic Figure 2 (sectioned); Figure 4 is the partial structure schematic Figure 3 (sectioned); Figure 5 is the partial structure schematic Figure 4 ; Figure 6 is the partial structure schematic Figure 5 ; Figure 7 is the partial structure schematic Figure 6 ; Figure 8 is the partial structure schematic Figure 7 ; Figure 9 is the partial structure schematic Figure 8 ; Figure 10 is the structural schematic diagram of the first displacement structure in the present invention; Figure 11 is the structural schematic diagram of the second displacement structure in the present invention; Figure 12 is the plan view of the second displacement structure in the present invention; Figure 13 is the assembly schematic diagram of the first conveyor belt and the second conveyor belt in the present invention; Figure 14 is the partial structure schematic Figure 9 ; Figure 15 is the present invention Figure 14 the enlarged view at A; Figure 16 is the partial structure schematic Figure 10 ; Figure 17 is the schematic diagram of the grinding operation process of the present invention (top view).

[0022] In the figure, 1 is a support platform; 2 is a fixing frame; 3 is a machine shell; 4 is a grinding belt; 5 is a second bracket; 6 is a driving pulley; 7 is a first bracket; 8 is a driven pulley; 9 is a right-angle frame; 10 is a first conveyor belt; 11 is an extension frame; 12 is a second conveyor belt; 13 is a driving shaft; 14 is a first driven shaft; 15 is a first transmission belt; 16 is a second driven shaft; 17 is a dust collection trough; 18 is a first guide rail; 19 is a bottom support frame; 20 is a second guide rail; 21 is a second electric rod; 22 is a first electric rod; 23 is a first bevel gear pair; 24 is a first rhombic driven shaft; 25 is a first support frame; 26 is a second bevel gear pair; 27 is a third driven shaft; 28 is a second transmission belt; 29 is a first lead screw; 30 is a first lead screw nut; 31 is a side support frame; 32 is a compression spring; 33 is a second lead screw; 34 is a second lead screw nut; 35 is a second driven bevel gear; 36 is a driving bevel gear; 37 is a first driven bevel gear; 38 is a first motor; 39 is a second motor; 40 is a first gear; 41 is a second gear; 42 is a third gear; 43 is a fourth gear; 44 is a guiding sliding sleeve; 45 is a guide rod; 46 is a screw rod; 47 is a screw nut; 48 is a second rhombic driven shaft; 49 is a third bevel gear pair; 50 is a fourth bevel gear pair; 51 is a second support frame; 52 is a first right-angle plate; 53 is a second right-angle plate; 54 is a pressing plate; 55 is a grinding platform. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating orientations or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0025] As Figures 1 - 17 shown, an embodiment of the present invention provides a technical solution: an automatic grinding device and grinding method for the sheet metal corners of a box-type substation.

[0026] On the one hand, the present invention provides an automatic grinding device for the sheet metal corners of a box-type substation: As Figures 1 - 4As shown in the figure, an automatic grinding device for the sheet metal corners of a box-type substation includes a grinding belt 4. The grinding belt 4 is wound around by pulleys to form a polygonal structure. One side of the polygonal structure serves as the grinding edge, and a right-angle frame 9 is provided inside the grinding belt 4 of the polygonal structure. The opening right angle of the right-angle frame 9 is aligned with the grinding edge. At the same time, a compensation structure is provided on one side of the polygonal structure close to the right-angle frame 9 to compensate for the deformation amount when the grinding edge is transformed into a right-angle edge. When grinding the sheet metal corners of the box-type substation, according to the grinding size range of the sheet metal corners, with the compensation structure as the driving source, on the one hand, the right-angle frame 9 forms a right-angle table of corresponding size to fit relatively with the sheet metal corners of the box-type substation, and on the other hand, the belt surface of the grinding belt 4 close to the right-angle table is elongated or shortened to compensate for the deformation amount required for the grinding belt 4 to concave to the right-angle table when contacting the sheet metal corners of the box-type substation. When the grinding belt 4 approaches the sheet metal corners of the box-type substation, the pressure of the sheet metal corners of the box-type substation causes the grinding edge of the grinding belt 4 to fit on the right-angle frame 9, so that the grinding edge forms a right-angle edge, and the right-angle edge applies pressure to and grinds the sheet metal corners of the box-type substation. Specifically: The right-angle frame 9 is aligned with the middle of the grinding edge, so that the grinding edge concaves with the right angle of the right-angle frame 9 as the center. The right-angle frame 9 is provided with two groups of extension frames 11 that are staggered and coincident along the extension direction of its side plates. And by using the compensation component composed of the compensation structure, the extension frames 11 are driven to move away from or close to the right-angle frame 9, so that the extension frames 11 and the right-angle frame 9 are displaced in a staggered and coincident manner to form a right-angle table with adjustable size, which is adapted to the grinding size range of the sheet metal corners of the box-type substation.

[0027] In addition, the pulley includes a driving pulley 6 and two driven pulleys 8. The driving pulley 6 and the two driven pulleys 8 make the grinding belt 4 form a triangular polygonal structure. The grinding edge is between the two driven pulleys 8. And by using the compensation component composed of the compensation structure, the driven pulleys 8 and the driving pulley 6 are driven to move synchronously with the extension frames 11. When the size of the right-angle table changes, the belt surface of the grinding edge of the grinding belt 4 is elongated or shortened synchronously to compensate for the deformation amount required for the grinding belt 4 to concave to the right-angle table under the pressure of the sheet metal corners of the box-type substation, so that the grinding belt 4 concaves to the right-angle table when contacting the sheet metal corners of the box-type substation.

[0028] It should be noted that inside the grinding belt 4, there is a casing 3 that supports it, and below the casing 3, there is a support platform 1. The support platform 1 supports the casing 3 through a fixing frame 2. Inside the support platform 1, there is a bottom support frame 19 that slidably supports the fixing frame 2. Above the bottom support frame 19, there is a combination of a second guide rail 20 and a second electric rod 21, which is used to drive the fixing frame 2 to move horizontally, push the grinding belt 4 against the corner of the sheet metal of the box-type substation, and when it contacts the corner of the sheet metal of the box-type substation, it concaves into the right-angle table, making the grinding belt 4 concave into a right-angle grinding edge, fully contacting the area to be ground of the sheet metal corner for precise grinding work. At the same time, on both sides and inside the bottom support frame 19, there are combinations of a first guide rail 18 and a first electric rod 22, which are used to drive the fixing frame 2 to move up and down, so that the grinding belt 4 moves up and down along the sheet metal corner to perform a full grinding process on the sheet metal corner.

[0029] As Figures 5 - 10 shown, to achieve the synchronous change of the size of the right-angle table and the telescopic change of the grinding belt 4, driven by the first displacement structure in the compensation component, the extension frame 11 is driven to move, and the driven pulley 8 can be driven to move synchronously. On the one hand, the extension frame 11 moves in the right-angle direction relative to the right-angle frame 9, so that a right-angle table with adjustable size is formed between the extension frame 11 and the right-angle frame 9 to adapt to the corner of the sheet metal of the box-type substation. On the other hand, the driven pulley 8 moves synchronously in the right-angle direction of the right-angle frame 9. By changing the gap between the two groups of driven pulleys 8, the belt surface of the grinding belt 4 close to the right-angle table is elongated or shortened to compensate for the deformation required for the grinding belt 4 to approach the right-angle table. Specifically: The first displacement structure includes first lead screws 29 arranged on both right-angle sides of the right-angle frame 9. Along the axial direction of the first lead screws 29, there are first lead screw nuts 30. On one side of the first lead screw nuts 30, there is a first bracket 7. The first bracket 7 is fixedly connected to the extension frame 11 and is rotatably connected to the driven pulley 8. By controlling the rotation of the first lead screws 29, the screw force is converted into horizontal transmission to the first lead screw nuts 30, pushing the first bracket 7 and the extension frame 11 to move synchronously in the right-angle direction of the right-angle frame 9. On the one hand, the extension frame 11 and the right-angle frame 9 are staggered and overlapped to form a right-angle table with adjustable size. On the other hand, the distance between the two groups of driven pulleys 8 on the first bracket 7 changes, elongating or shortening the length of the grinding belt 4 close to the right-angle table to adapt to the changing right-angle table and compensate for the deformation required for the grinding belt 4 to approach the right-angle table.

[0030] As a further solution of this embodiment, each group of the first lead screws 29 is provided with two. By providing two first lead screws 29 and providing a first gear 40 at one axial end thereof, and making them keep synchronous meshing through a second gear 41 provided between the two first gears 40, the two first lead screws 29 are driven to rotate synchronously. When the two first lead screws 29 rotate, since the two first lead screw sleeves 30 on the lead screws are integrally fixed through the first bracket 7, their rotational force has the ability to be converted into a horizontal thrust, which is respectively transmitted to the first lead screw sleeves 30 to push the first lead screw sleeves 30 to move. Moreover, the arrangement of the two lead screws can also play a role in arm force support, making the movement of the first bracket 7 more stable.

[0031] Further, the compensation assembly further includes a first motor 38 provided in the machine housing 3. A driving bevel gear 36 is provided at the output end of the first motor 38. The driving bevel gear 36 meshes with a first driven bevel gear 37 provided at one end of the first lead screw 29. By controlling the first motor 38 to drive the driving bevel gear 36 to rotate, and using the meshing transmission between the driving bevel gear 36 and the first driven bevel gear 37, the first lead screw 29 is pushed to rotate, generating a driving source for driving the extension frame 11 and the driven pulley 8 to move synchronously.

[0032] As Figures 5 - 9 、 Figures 11 - 12 shown, in order to provide the deformation amount required when the grinding belt 4 expands and contracts, driven by the second displacement structure in the compensation assembly, the driving pulley 6 is driven to move synchronously with the driven pulley 8 to provide the deformation amount required for the concave right-angle table of the grinding belt 4. Specifically: The second displacement structure includes a second lead screw 33 provided in the right-angle direction of the right-angle frame 9 away from the first lead screw 29. A second lead screw sleeve 34 is provided along the axial direction of the second lead screw 33. A side support frame 31 is provided at the other end of the second lead screw sleeve 34. And the second lead screw sleeve 34 is fixedly connected to the second bracket 5 through the side support frame 31. At the same time, the second bracket 5 is also rotatably connected to the driving pulley 6. By controlling the second lead screw 33 to rotate, the threading force of the second lead screw 33 is horizontally transmitted to the second lead screw sleeve 34, pushing the second bracket 5 to move, and then pushing the driving pulley 6 to move, so that the driving pulley 6 moves synchronously with the driven pulley 8 to provide the deformation amount required when the grinding belt 4 expands and contracts.

[0033] It should be noted that a second driven bevel gear 35 meshing with the driving bevel gear 36 is provided at one end of the second lead screw 33, and the transmission between the second lead screw 33 and the second driven bevel gear 35 is connected through meshing transmission of a third gear 42 provided on the second lead screw 33 and a fourth gear 43 provided on the second driven bevel gear 35. Since there is one set of driving pulleys 6 and two sets of driven pulleys 8, the deformation amount of the grinding belt 4 driven by the two sets of driven pulleys 8 to expand and contract is greater than the compensation deformation amount of the grinding belt 4 driven by one set of driving pulleys 6. Therefore, by designing the third gear 42 and the fourth gear 43 in a state of different gear transmission ratios, the second lead screw 33 maintains a differential transmission state relative to the first lead screw 29, so that a speed difference is generated in the displacement of the driving pulley 6 and the two sets of driven pulleys 8, making the displacement change of the grinding belt 4 closer to the driving pulley 6 greater, and providing the deformation amount required for the two sets of driven pulleys 8 to drive the grinding belt 4 to expand and contract. Since the meshing of the third gear 42 and the fourth gear 43 forms driving forces in opposite directions, the transmission of the second lead screw 33 and the second driven bevel gear 35 remains in opposite directions. Then, while the first motor 38 drives the driving bevel gear 36 to rotate, the driving forces formed by the meshing of the driving bevel gear 36 and the first driven bevel gear 37, and the driving bevel gear 36 and the second driven bevel gear 35, when transmitted to the first lead screw 29 and the second lead screw 33, cause the first lead screw 29 and the second lead screw 33 to be driven in a reverse rotation manner. Then, by setting the thread of the second lead screw 33 in the opposite direction to that of the first lead screw 29, the displacement of the second lead screw 33 driving the second nut 34 and the displacement of the first lead screw 29 driving the first nut 30 are driven in the same direction displacement, so that the driving pulley 6 and the driven pulley 8 move in the same direction, providing the deformation space required for the expansion and contraction of the grinding edge of the grinding belt 4.

[0034] As a further solution of this embodiment, the second displacement structure further includes a screw rod 46 provided on one side of the side support frame 31, and is provided with at least one set. The screw rod 46 is provided with a screw sleeve 47 along its axial direction, and a compression spring 32 is sleeved on the screw rod 46. The compression spring 32 is fixedly connected to the second bracket 5 and is rotationally connected to the screw sleeve 47. When the screw sleeve 47 moves along the screw rod 46, it applies or releases elastic energy storage capacity to the compression spring 32. When using the extension frame 11 and the right-angle frame 9 to form a right-angle table with adjustable size, when the right-angle side of the right-angle table is larger, the grinding belt 4 is recessed to a greater length required for the right-angle table. At this time, by rotating the screw sleeve 47 to move along the screw rod 46 (there is a tension between the driving pulley 6, the driven pulley 8, and the grinding belt 4, and its tension pressure is transmitted to the second bracket 5 through the driving pulley 6, applying a limit to the compression spring 32, so that when the screw sleeve 47 moves, it can be compressed or released), it moves away from the compression spring 32, releases the elastic compression force of the compression spring 32, enables the compression spring 32 to maintain a greater elastic strain, provides a greater compression deformation space for the displacement of the driving pulley 6, and when the recessed pressure of the grinding belt 4 is transmitted to the driving pulley 6, drives the driving pulley 6 to move, so that the grinding belt 4 on the side close to the driving pulley 6 is used as the length required for its recess. On the contrary, when the right-angle side of the right-angle table is smaller, the grinding belt 4 is recessed to a smaller length required for the right-angle table. At this time, rotate the screw sleeve 47 in the reverse direction to compress the compression spring 32, so that it maintains a smaller elastic strain and provides a smaller compression deformation space for the displacement of the driving pulley 6 to provide the length required for the recess of the grinding belt 4. Moreover, by adjusting the elastic strain of the compression spring 32, while providing the length required for the recess of the grinding belt 4, it can always maintain the maximum elastic compression state under the recessed pressure of the grinding belt 4, so that when the recess size of the grinding belt 4 changes, the compression spring 32 always maintains the maximum elastic reset support for it to maintain the tension transmission characteristics between the driving pulley 6, the driven pulley 8, and the grinding belt 4. At the same time, the elastic support of the compression spring 32 to the driving pulley 6 can also play an auxiliary displacement role, so that when the grinding belt 4 close to the driven pulley 8 elongates and shortens, and the grinding belt 4 close to the driving pulley 6 cannot meet the amount required for its expansion and contraction, a margin compensation effect is provided.

[0035] Furthermore, a guiding sliding sleeve 44 is provided on the displacement path of the second wire sleeve 34. A guide rod 45 is slidably connected inside the guiding sliding sleeve 44. The guide rod 45 penetrates through the side support frame 31, the screw rod 46 and is fixedly connected to the second bracket 5. When the guide rod 45 slides along the guiding sliding sleeve 44, rotational limit is applied to the displacement of the side support frame 31, and guiding limit is applied to the displacement of the second bracket 5. By utilizing the telescopic sliding combination of the guiding sliding sleeve 44 and the guide rod 45, on the one hand, horizontal guiding limit is applied to the side support frame 31 and the second wire sleeve 34, enabling the second lead screw 33 to convert the thread force into a horizontal force and transmit it to the second wire sleeve 34. On the other hand, it plays a guiding and supporting role, providing auxiliary support for the displacement of the second bracket 5. When the driving pulley 6 on the second bracket 5 moves, it can slide telescopically under the thrust of the second lead screw 33 and also slide telescopically under the elastic telescopic force of the compression spring 32.

[0036] The transmission of the tension force among the driving pulley 6, the driven pulley 8 and the grinding belt 4 is usually greater than the frictional force between the grinding belt 4 and the sheet metal corner, and slippage usually does not occur. As Figures 5 - 6 , Figures 13 - 16 shown, to achieve the synchronous drive of the two conveyor belts and the grinding belt 4, two groups of first conveyor belts 10 are provided in a staggered form on the two side plates of the right-angle frame 9, and two groups of second conveyor belts 12 are respectively provided on the extension frame 11 with the first conveyor belts 10 staggered. The first conveyor belts 10, the second conveyor belts 12 are in contact with the grinding belt 4 recessed into the right-angle table and rotate coaxially. On the one hand, the relative frictional force between the grinding belt 4 and the right-angle table is reduced. On the other hand, when the grinding belt 4 tends to stall due to excessive grinding intensity, a thrust is applied to the grinding belt 4 to maintain the grinding drive state of the grinding belt 4. Specifically: A second motor 39 is provided inside the machine housing 3. The output end of the second motor 39 is provided with a driving shaft 13. As a driving source, the driving shaft 13 drives the grinding belt 4 to transmit on the one hand for frictional grinding work, and drives the first conveyor belts 10 and the second conveyor belts 12 to transmit on the other hand, rotating synchronously with the grinding belt 4, playing a role in reducing friction and assisting in pushing for the grinding belt 4.

[0037] As a further solution of this embodiment, to drive the grinding belt 4, a third driven shaft 27 is provided on one side of the driving pulley 6. A second transmission belt 28 is provided between the third driven shaft 27 and the driving pulley 6. A first rhombic driven shaft 24 is provided on one side of the third driven shaft 27. The first rhombic driven shaft 24 is rotatably arranged on the second bracket 5 through a first support frame 25. The first rhombic driven shaft 24 and the third driven shaft 27 are engaged through a second bevel gear pair 26. A first driven shaft 14 is sleeved on the first rhombic driven shaft 24 to keep the two in coaxial transmission. The first driven shaft 14 is engaged with the driving shaft 13 through a first bevel gear pair 23. Then, when the second motor 39 is controlled to drive the driving shaft 13 to rotate, the engagement of the first bevel gear pair 23 is used to drive the first driven shaft 14 to rotate, synchronously driving the coaxial transmission of the first driven shaft 14 and the first rhombic driven shaft 24. Then, the engagement of the second bevel gear pair 26 is used to drive the third driven shaft 27 to rotate. The third driven shaft 27 drives the driving pulley 6 to rotate through the second transmission belt 28. The driving pulley 6 is used as a driving wheel, and the other two driven pulleys 8 are used as driven wheels to drive the grinding belt 4 to transmit. The concave right-angle table belt surface of the grinding belt 4 is used to perform frictional grinding work on the sheet metal corners of the box-type substation. The debris generated by grinding falls into the dust collection groove 17 under the action of gravity for collection.

[0038] It should be noted that since the first rhombic driven shaft 24 is slidably connected to the first driven shaft 14, when the first rhombic driven shaft 24 displaces with the driving pulley 6 on the second bracket 5, it can always maintain coaxial rotation with the first driven shaft 14.

[0039] Furthermore, in order to realize the synchronous rotation of the two sets of conveyor belts and the grinding belt 4, a second driven shaft 16 is provided at a right angle to the right-angle frame 9. A first transmission belt 15 is provided between the second driven shaft 16 and the driving shaft 13, and is coaxially driven with the two sets of first conveyor belts 10. At the same time, a second prismatic driven shaft 48 mounted on the right-angle frame 9 is provided on the moving path of the extension frame 11. The second prismatic driven shaft 48 is meshed with the second driven shaft 16 through a third bevel gear pair 49, and the second prismatic driven shaft 48 is provided with a fourth bevel gear pair 50 along its axial sliding direction. The fourth bevel gear pair 50 is coaxial with the second conveyor belt 12. When the second motor 39 is controlled to drive the driving shaft 13 to rotate, The first transmission belt 15 is used to drive the second driven shaft 16 to rotate. When the second driven shaft 16 rotates, on the one hand, the first conveyor belt 10 is driven to operate, and on the other hand, the third bevel gear pair 49 is used to drive the second prismatic driven shaft 48 to rotate. The fourth bevel gear pair 50 provided on the second prismatic driven shaft 48 drives the second conveyor belt 12 to operate, so that the first conveyor belt 10 and the second conveyor belt 12 operate synchronously, and rotate synchronously with the grinding belt 4, reducing the friction between the grinding belt 4 and the right-angle table. At the same time, when the grinding belt 4 stalls and slows down due to excessive grinding load during the grinding process, auxiliary push can be applied to improve the grinding operation stability of the grinding belt 4.

[0040] It should be noted that, of the two sets of bevel gears of the fourth bevel gear pair 50, one set of bevel gears is provided on the second prismatic driven shaft 48, and the other set of bevel gears is provided on the second conveyor belt 12. Among them, one set of bevel gears provided on the second prismatic driven shaft 48 is rotationally connected to the second support frame 51, and the second support frame 51 is fixed to the extension frame 11, so that when the extension frame 11 moves, the driving bevel gears slide and rotate along the second prismatic driven shaft 48, and the other set of bevel gears is provided on the rotating shaft of the second conveyor belt 12. Since the second conveyor belt 12 also moves synchronously with the extension frame 11, the two sets of bevel gears always remain in a meshing state, so that the fourth bevel gear pair 50 has the characteristic of sliding and rotating drive along the second prismatic driven shaft 48, so that when the second conveyor belt 12 moves with the extension frame 11, it always maintains a synchronous transmission characteristic with the first conveyor belt 10.

[0041] The grinding belt 4 can be made of nylon anti-stretching sanding belt. Nylon anti-stretching sanding belt is a new type of grinding material with anti-stretching cloth as the backing. It is suitable for burr removal and polishing before and after machining of metal materials. It has elastic tensile properties when subjected to force, and the length required for the indentation of the grinding belt 4 mainly comes from the deformation length provided by the displacement of the driving pulley 6 and the driven pulley 8, and the deformation space provided by the compression deformation of the compression spring 32.

[0042] On the other hand, the present invention also provides a method for automatically grinding sheet metal corners of a box-type substation, such as Figure 17 As shown, the following steps are included: Step 1: According to the size of the corner to be polished of the box-type substation, control the extension frame 11 to move away from or close to the right-angle frame 9 so that the two form a right-angle table of a suitable size. Step 2: Place the box-type substation on the polishing platform 55, and make the corner to be polished face the right angle of the right-angle frame 9. Then adjust the orientations of the first right-angle plate 52 and the second right-angle plate 53 so that they are in contact with the two side plates of the box-type substation on both sides of the corner, apply a limit to it, and then control the pressing plate 54 to apply pressure to the box-type substation to position the box-type substation at three points. Step 3: Driven by the second electric rod 21, push the right-angle table formed by the right-angle frame 9 and the extension frame 11 towards the corner of the box-type substation and press it against the corner. At this time, the polishing belt 4 is concave inward due to the resistance of the corner of the box-type substation, so that its outer polishing surface is closely attached to the corner of the box-type substation, and its inner driving surface is closely attached to the right-angle table and is in contact with the first conveyor belt 10 and the second conveyor belt 12. Step 4: Control the polishing belt 4 to rotate so that the polishing contact part runs along the trajectory of the right-angle table to polish the corner of the box-type substation closely. Driven by the first electric rod 22, push the polishing belt 4 to move up and down and move along the corner line of the box-type substation to polish its corner comprehensively. While the polishing belt 4 is running, drive the first conveyor belt 10 and the second conveyor belt 12 to rotate synchronously to reduce the frictional resistance of the polishing belt 4 in the right-angle table, and at the same time apply a stall thrust to the polishing belt 4.

[0043] In addition, please refer to Figure 17 , the first right-angle plate 52, the second right-angle plate 53, and the pressing plate 54 all move in the way of electric push rods to adapt to the limit fixing and polishing work of box-type substations of different sizes.

Claims

1. An automatic grinding device for the sheet metal corners of a box-type substation, characterized in that include: A grinding belt (4), wherein the grinding belt (4) is wound into a polygonal structure by a pulley, and one side of the polygonal structure serves as a grinding side; A right-angle frame (9), the right-angle frame (9) is located in the polygonal structure, the opening angle of the right-angle frame (9) is aligned with the polished edge, and the polished edge is pressed against the polished edge by using the metal corner of the box-type substation sheet metal so that the polished edge is attached to the right-angle frame (9), so that the polished edge forms a right-angle edge, and the right-angle edge presses and polishes the metal corner of the box-type substation sheet metal; A compensation structure is located in the polygonal structure and is used to compensate for the deformation of the polished edge when it is transformed into a right-angled edge.

2. The automatic grinding device for the sheet metal corners of a box-type substation according to claim 1, wherein The right-angle frame (9) is aligned with the middle of the grinding edge, and the right-angle frame (9) is provided with two sets of extension frames (11) that overlap with the right-angle frame along the extension direction of the side plate thereof; The compensation structure includes a compensation component, which is arranged on a right-angle side of the right-angle frame (9) and is used to drive the extension frame (11) away from or close to the right-angle frame (9). The extension frame (11) and the right-angle frame (9) form a right-angle platform with adjustable size.

3. The automatic grinding device for the sheet metal corners of a box-type substation according to claim 2, characterized in that, The pulleys include a driving pulley (6) and two driven pulleys (8), the driving pulley (6) and the two driven pulleys (8) form a triangular structure of the grinding belt (4), and a grinding edge is formed between the two driven pulleys (8); The compensation component is also used to drive the driven pulley (8) and the driving pulley (6) to move synchronously with the extension frame (11).

4. An automatic grinding device for the sheet metal corners of a box-type substation according to claim 3, characterized in that Also includes: A first conveyor belt (10), wherein the first conveyor belt (10) is provided in two groups and is arranged in a staggered manner on two side plates of the right-angle frame (9); The second conveyor belt (12) is provided in two groups, which are staggered with the first conveyor belt (10) and are provided on the extension frame (11), and rotate simultaneously with the first conveyor belt (10). When the grinding belt (4) is transformed into a right angle by the pressure of the metal corner of the box-type substation sheet metal, it contacts the first conveyor belt (10) and the second conveyor belt (12).

5. The automatic grinding device for the sheet metal corners of a box-type substation according to claim 4, characterized in that, Also includes: A second driven shaft (16), the second driven shaft (16) is arranged at a right angle to the right-angle frame (9) and is coaxial with the two sets of first conveyor belts (10); The second prismatic driven shaft (48) is provided on the moving path of the extension frame (11) and is meshed with the second driven shaft (16) through the third bevel gear pair (49). The second prismatic driven shaft (48) is provided with a fourth bevel gear pair (50) along its axial sliding direction, and the fourth bevel gear pair (50) is coaxial with the second conveyor belt (12), so that when the second conveyor belt (12) moves relative to the first conveyor belt (10), the second conveyor belt (12) and the first conveyor belt (10) always keep synchronous rotation.

6. The automatic grinding device for the sheet metal corners of a box-type substation according to claim 5, wherein: The compensation assembly comprises a first displacement structure for driving the extension frame (11) to move synchronously with the driven pulley (8) and a second displacement structure for driving the active pulley (6) to move synchronously with the driven pulley (8), wherein: The first displacement structure includes: A first screw rod (29), wherein the first screw rod (29) is provided in two groups, each group being provided with two screw rods, the two groups of first screw rods (29) being provided at right angles to the right angle frame (9) at a ninety-degree angle, and the first screw rod (29) being provided with a first wire sleeve (30) along its axial direction; The first bracket (7) is arranged on the first wire sleeve (30). The threading force of the first lead screw (29) is horizontally transmitted to the first wire sleeve (30) to push the first bracket (7) to move. The first bracket (7) is fixedly connected to the extension bracket (11) and is rotatably connected to the driven pulley (8).

7. An automatic grinding device for the sheet metal corners of a box-type substation according to claim 6, characterized in that, The second displacement structure includes: A second lead screw (33) is arranged in the right-angle direction of the right-angle bracket (9) away from the first lead screw (29). A second wire sleeve (34) is arranged along the axial direction of the second lead screw (33), and a side support bracket (31) is arranged at the other end of the second wire sleeve (34); A second bracket (5) is arranged on the second wire sleeve (34). The threading force of the second lead screw (33) is horizontally transmitted to the second wire sleeve (34) to push the second bracket (5) to move. The second bracket (5) is fixedly connected to the second wire sleeve (34) through the side support bracket (31) and is rotatably connected to the driving pulley (6).

8. An automatic grinding device for the sheet metal corners of a box-type substation according to claim 7, characterized in that: The second displacement structure further includes: A screw rod (46) is arranged on one side of the side support bracket (31) and is at least provided in a group. A screw sleeve (47) is arranged along the axial direction of the screw rod (46); A compression spring (32) can be sleeved on the screw rod (46). The compression spring (32) is fixedly connected to the second bracket (5) and is rotatably connected to the screw sleeve (47). When the screw sleeve (47) moves along the screw rod (46), elastic energy storage ability is applied to or released from the compression spring (32); A guiding sliding sleeve (44) is arranged on the displacement path of the second wire sleeve (34). A guide rod (45) is slidably connected in the guiding sliding sleeve (44). The guide rod (45) penetrates through the side support bracket (31), the screw rod (46) and is fixedly connected to the second bracket (5). When the guide rod (45) slides along the guiding sliding sleeve (44), rotational limit is applied to the displacement of the side support bracket (31), and guiding limit is applied to the displacement of the second bracket (5).

9. The automatic grinding device for the sheet metal corners of a box-type substation according to claim 7, characterized in that: The compensation assembly further includes a driving bevel gear (36) arranged between the first lead screw (29) and the second lead screw (33). Among them, The driving bevel gear (36) meshes with a first driven bevel gear (37) arranged at one end of the first lead screw (29), and the driving bevel gear (36) meshes with a second driven bevel gear (35) arranged at the other end of the second lead screw (33).

10. An automatic grinding method for the sheet metal corners of a box-type substation, applicable to the automatic grinding device for the sheet metal corners of the box-type substation described in claim 9, characterized in that, It includes the following steps: Step 1, according to the size of the corner to be polished of the box-type substation, control the extension bracket (11) to move away from or close to the right-angle bracket (9), and the two form a right-angle table with a suitable size; Step 2, place the box-type substation on the polishing platform (55), and make the corner to be polished opposite to the right angle of the right-angle bracket (9). Then adjust the orientations of the first right-angle plate (52) and the second right-angle plate (53) to make them fit the box plates on both sides of the corner of the box-type substation, apply limit to it, and then control the pressing plate (54) to apply pressure to the box-type substation to position the box-type substation at three points; Step 3: Driven by the second electric rod (21), push the right-angle frame (9) and the right-angle table of the extension frame (11) against the corner of the box-type substation and press them against the corner. At this time, the grinding belt (4) is concave inward due to the resistance of the corner of the box-type substation, so that its outer grinding surface closely adheres to the corner of the box-type substation, and its inner driving surface closely adheres to the right-angle table and fits with the first conveyor belt (10) and the second conveyor belt (12); Step 4: Control the rotation of the grinding belt (4) so that the grinding contact part operates along the trajectory of the right-angle table to perform close grinding on the corner of the box-type substation. Driven by the first electric rod (22), push the grinding belt (4) to move up and down and move along the corner line of the box-type substation to perform comprehensive grinding on its corner. While the grinding belt (4) is operating, drive the first conveyor belt (10) and the second conveyor belt (12) to rotate synchronously to reduce the frictional resistance of the grinding belt (4) inside the right-angle table, and at the same time apply a stall thrust to the grinding belt (4).

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