A transformer winding drying constant voltage structure

Abstract

The present invention discloses a transformer winding drying constant pressure structure, which relates to the technical field of transformer winding processing, and comprises a chassis, a fixed disk, a support column, a clamping disk and a cylinder, wherein the support column is arranged between the chassis and the fixed disk, the top end of the support column is screwed with the fixed disk, and the cylinder is arranged around the edge of the fixed disk and the clamping disk, and a clamping structure is arranged inside the support column; the present invention ensures that the transformer winding is fixed between the clamping plates, and avoids a large change in the diameter of the winding when the winding is pressurized in the later stage, and is suitable for clamping transformer windings with different inner diameters, and can limit the clamping disk in contact with the transformer winding, so that the clamping disk will not move in the opposite direction or move slightly, thereby ensuring that the pressure between the clamping disk and the transformer winding is constant, and the insulating parts in the winding are fully compressed during the whole drying process, thereby improving the performance of the transformer in preventing short circuit and the service life.

Description

Technical Field

[0001] The invention relates to the technical field of transformer winding processing, in particular to a transformer winding drying constant voltage structure. Background Art

[0002] A series of process treatments are required in the production process of transformer windings. The drying constant pressure process applies constant pressure to the windings in the axial direction during the drying process. This allows the insulation in the windings to be fully compressed throughout the drying process, thereby improving the transformer's short-circuit prevention performance and service life. As a result, the requirements for transformer winding drying constant pressure are getting higher and higher.

[0003] In the prior art, placing the transformer winding on the support column of the equipment and applying pressure can easily cause the diameter of the transformer winding to change, especially the inner diameter of the transformer winding will undergo a significant deformation as the pressure increases, so that the inner diameter of the winding after pressurization cannot be well inserted into the iron core of the transformer winding, affecting the subsequent use of the winding. The transformer winding and the clamping plate cannot maintain a certain pressure when in contact, making the transformer winding relatively loose, thereby increasing the risk of transformer short circuit. When the clamping plate contacts the winding, it is necessary to limit the reverse movement of the clamping plate. Summary of the invention

[0004] The object of the present invention is to provide a transformer winding drying constant voltage structure to solve the problems raised in the above background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A transformer winding drying constant pressure structure comprises a chassis, a fixed disk, a support column, a clamping disk and a cylinder, wherein the support column is arranged between the chassis and the fixed disk, the top end of the support column is screwed with the fixed disk, and the cylinder is arranged around the edge of the fixed disk and the clamping disk, a clamping structure is arranged inside the support column, the clamping structure comprises three groups of reserved grooves, the three groups of reserved grooves are arranged on the side wall of the support column, the support column is rotatably connected with a first rotating shaft, two groups of first threads are arranged in the middle of the first rotating shaft, the thread rotation directions of the upper and lower first threads are opposite, the first threads are threadedly connected with a first nut seat, and the movement directions of the two first nut seats are opposite, the edges of the two first nut seats are connected with three first connecting rods, both ends of the first connecting rod are connected with connecting pins, a clamping plate is connected between the ends of the same side of the upper and lower first connecting rods, the clamping plate is located inside the reserved groove, the interior of the chassis is rotatably connected with the first rotating rod, and a first bevel gear set is arranged between the end of the first rotating rod and the end of the first rotating shaft.

[0007] As a preferred technical solution of the present invention, the first bevel gear set is composed of two bevel gears meshing with each other, and the two bevel gears are respectively fixed to the end of the first rotating rod and the end of the first rotating shaft, and the first rotating shaft is rotatably connected to the inner ends of the support column.

[0008] As a preferred technical solution of the present invention, the three clamping plates and the three first connecting rods on the first nut seat are arranged in a circular array, and the lengths of the upper and lower first connecting rods are the same, and the area enclosed by the upper and lower first connecting rods, the support columns and the clamping plates is an isosceles trapezoid, and the diameter of the circle where the three clamping plates are located is adjustable.

[0009] As a preferred technical solution of the present invention, limit rings are welded at the ends of the two first threads and located near the middle of the first rotating shaft, and the diameter of the limit rings is larger than the nominal diameter of the first threads.

[0010] As a preferred technical solution of the present invention, a constant pressure assembly is provided at the inner upper end of the support column and at the pressure plate, and the constant pressure assembly includes a second rotating shaft, the second rotating shaft is located inside the first rotating shaft, the first rotating shaft and the second rotating shaft rotate relative to each other, a second thread is provided at the upper end of the second rotating shaft, a second nut seat is sleeved on the end of the second thread, the second nut seat is threadedly connected to the second thread, three telescopic rods are welded on the side wall of the second nut seat, a connecting ring is welded on the end of each telescopic rod, and an adjustment groove is provided at the end of the three clamping plates, and a check block is slidably connected inside the adjustment groove, two connected second connecting rods are provided between the end of the check block and the side wall of the clamping plate, and the ends of the two second connecting rods are provided with teeth meshing with each other, the end of the check block is in contact with the connecting ring, the three check blocks are in contact with the surface of the pressure plate, and the end of the first rotating rod is movably connected to the pressure plate.

[0011] As a preferred technical solution of the present invention, the internal rotation of the chassis is connected with a second rotating rod, and a second bevel gear set is arranged between the end of the second rotating rod and the end of the first rotating shaft. The second bevel gear set is composed of two bevel gears meshing with each other, and a bevel gear of the second bevel gear set and a bevel gear of the first bevel gear set are coaxial and rotate relative to each other.

[0012] As a preferred technical solution of the present invention, a sliding groove is provided at the upper end of the first rotating shaft, the end of the second rotating shaft and the end of the first rotating shaft both pass through the interior of the second nut seat, the sliding groove is slidably connected to the second nut seat, and the connecting ring is always in contact with the upper end of the check block.

[0013] As a preferred technical solution of the present invention, the two second connecting rods are of equal length, the check block is composed of two connecting blocks welded to each other, the check block is movably connected to the end of one of the second connecting rods, and the clamping plate is movably connected to the end of the other second connecting rod.

[0014] As a preferred technical solution of the present invention, a drying structure is provided inside the three clamping plates, and the drying structure includes a ventilation pipe, which is embedded in the inside of the clamping plate. A row of fixed grooves are provided on both side walls of the clamping plate. Ventilation nozzles are provided in the middle of the ventilation pipe and inside the fixed grooves. The two rows of ventilation nozzles are arranged obliquely to both sides. A connecting hose is connected to the bottom end of the ventilation pipe, and the connecting hose is connected to the hot air blower.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. A clamping structure is provided to fix and clamp the inner circle of the transformer winding through various clamping plates to ensure that the transformer winding is fixed between the clamping plates, thereby avoiding a large change in the diameter of the winding when the winding is pressurized later. The diameter of the circle where the clamping plate is located can be changed according to the diameter of the transformer winding, which is suitable for clamping transformer windings with different inner diameters;

[0017] 2. A constant pressure component is provided. The check block is pressed down by the second nut seat that moves up and down, so that the compression plate in contact with the transformer winding can be limited, so that the compression plate will not move in the opposite direction or move slightly, ensuring that the pressure between the compression plate and the transformer winding is constant, and the insulating parts in the winding are fully compressed during the whole drying process, thereby improving the performance of the transformer in preventing short circuits and the service life;

[0018] 3. The clamping plate, clamping plate and check block cooperate with each other, and the shape of the transformer winding is restricted by them. The shape of the transformer is not easy to change significantly in the later stage. The check block at the corner slides inside the clamping plate to reduce the damage of the check block.

[0019] 4. A drying structure is provided. During the compression of the transformer winding, the hot air ejected from the vent nozzle can dry the winding gap, so that the moisture of the insulating material at the winding gap is evaporated, the insulation resistance is increased, and the flashover voltage is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0021] Figure 1 It is the main structure diagram of the present invention;

[0022] Figure 2It is a schematic diagram of the interior of the support column of the present invention;

[0023] Figure 3 It is a schematic diagram of the clamping structure of the present invention;

[0024] Figure 4 is a schematic diagram of a first bevel gear set of the present invention;

[0025] Figure 5 It is a schematic diagram of the first connecting rod and the clamping plate of the present invention;

[0026] Figure 6 It is a schematic diagram of a constant voltage assembly of the present invention;

[0027] Figure 7 is a schematic diagram of a second bevel gear set of the present invention;

[0028] Figure 8 It is a schematic diagram of the telescopic rod and the connecting ring of the present invention;

[0029] Fig. 9 It is a schematic diagram of the second connecting rod and teeth of the present invention;

[0030] Fig.10 It is a schematic diagram of the drying structure of the present invention.

[0031] In the figure: 1. chassis; 2. fixed plate; 3. support column; 4. clamping plate; 5. first rotating rod; 6. clamping structure; 7. constant pressure assembly; 8. second rotating rod; 9. drying structure; 10. cylinder; 61. first bevel gear set; 62. first rotating shaft; 63. first thread; 64. first nut seat; 65. first connecting rod; 66. clamping plate; 67. reserved groove; 68. connecting pin; 69. limiting ring; 71. second bevel gear set; 72. second nut seat; 73. telescopic rod; 74. sliding groove; 75. second rotating shaft; 76. second thread; 77. second connecting rod; 78. check block; 79. teeth; 710. adjustment groove; 711. connecting ring; 91. vent pipe; 92. fixed groove; 93. vent nozzle; 94. connecting hose. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] See also Figure 1-Figure 3As shown, a transformer winding drying constant pressure structure includes a chassis 1, a fixed disk 2, a support column 3, a pressing disk 4 and a cylinder 10. The support column 3 is arranged between the chassis 1 and the fixed disk 2. The transformer winding is placed on the support column 3 and supported by the chassis 1. The top of the support column 3 is screwed with the fixed disk 2. After the transformer winding is placed, the fixed disk 2 is screwed on the top of the support column 3. The cylinder 10 is arranged around the edge of the fixed disk 2 and the pressing disk 4, and the pressing disk 4 under the fixed disk 2 is pressed by the telescopic cylinder 10. During the drying process, the winding is always subjected to a constant pressure in the axial direction, so that the insulating parts in the winding can be fully compressed during the entire drying process, thereby improving the performance of the transformer in preventing short circuits and the service life. A clamping structure 6 is provided inside the support column 3, and the clamping structure 6 includes three groups of reserved grooves 67, and the three groups of reserved grooves 67 are opened on the side wall of the support column 3. The three reserved grooves 67 are evenly distributed on the side wall of the support column 3. The support column 3 is internally rotatably connected with a first rotating shaft 62, and two groups of first threads 63 are opened in the middle of the first rotating shaft 62. The upper and lower first threads 63 are connected to the first rotating shaft 62. The thread rotation directions of the threads 63 are opposite, and the first threads 63 are both threadedly connected with the first nut seats 64, and the movement directions of the two first nut seats 64 are opposite, so that the first rotating shaft 62 is rotated to make the two first nut seats 64 approach or move away from each other, and the edges of the two first nut seats 64 are connected to three first connecting rods 65, and the two ends of the first connecting rods 65 are connected to connecting pins 68. A clamping plate 66 is connected between the same side ends of the upper and lower first connecting rods 65, and the position change of the two first nut seats 64 will cause the diameter of the circle where the three clamping plates 66 are located to change. The clamping plate 66 is located inside the reserved groove 67, so that the clamping plate 66 can be unfolded from the inside of the reserved groove 67 to clamp the transformer winding, thereby avoiding a large change in the inner diameter of the winding when the clamping structure 6 is pressurized in the later stage. The internal rotation of the chassis 1 is connected to the first rotating rod 5, and a first bevel gear set 61 is arranged between the end of the first rotating rod 5 and the end of the first rotating shaft 62. The first bevel gear set 61 can be rotated by rotating the first rotating rod 5, so that the first rotating shaft 62 can drive the first nut seat 64 to move closer to or away from each other.

[0035] See also Figure 3 and Figure 4 As shown, the first bevel gear set 61 is composed of two bevel gears meshing with each other, and the two bevel gears are respectively fixed to the end of the first rotating rod 5 and the end of the first rotating shaft 62. The first rotating shaft 62 is rotatably connected to the two ends inside the support column 3. When the first rotating rod 5 rotates, it will drive one bevel gear of the first bevel gear set 61 to rotate, and then the bevel gear drives the other bevel gear of the first bevel gear set 61 to rotate, so that the first rotating shaft 62 can rotate inside the support column 3, thereby providing adjustment power for the operation of the clamping structure 6.

[0036] See also Figure 3 and Figure 5 As shown, the three clamping plates 66 and the three first connecting rods 65 on the first nut seat 64 are arranged in a circular array, and the lengths of the upper and lower first connecting rods 65 are the same, so that when the first rotating shaft 62 is rotated, the two first nut seats 64 approach or move away from each other, so that the moving distances of the first nut seats 64 are the same, and the area surrounded by the upper and lower first connecting rods 65, the support column 3 and the clamping plates 66 is an isosceles trapezoid, and the diameter of the circle where the three clamping plates 66 are located is adjustable. At this time, the clamping plates 66 can be unfolded from the inside of the reserved groove 67, and the transformer winding placed on the support column 3 can be reinforced. The isosceles trapezoidal first connecting rods 65 are more secure, ensuring that the transformer winding is fixed between the clamping plates 66.

[0037] See also Figure 3 and Figure 5 As shown, a limiting ring 69 is welded at the end of the two first threads 63 and located near the middle position of the first rotating shaft 62. The diameter of the limiting ring 69 is larger than the nominal diameter of the first thread 63. After the first nut seat 64 is screwed onto the first rotating shaft 62, the limiting ring 69 is welded, so that the first nut seat 64 can be prevented from gathering too close when the first nut seat 64 and the first thread 63 are screwed together.

[0038] See also Figure 2 and Figure 6As shown, a constant pressure assembly 7 is provided at the inner upper end of the support column 3 and located at the clamping plate 4. The constant pressure assembly 7 includes a second rotating shaft 75. The second rotating shaft 75 is located inside the first rotating shaft 62. The first rotating shaft 62 inside the first rotating shaft 62 rotates relative to the second rotating shaft 75. A second thread 76 is provided at the upper end of the second rotating shaft 75. A second nut seat 72 is sleeved at the end of the second thread 76. The second nut seat 72 is threadedly connected with the second thread 76. Three telescopic rods 73 are welded to the side wall of the second nut seat 72. A connecting ring 711 is welded at the end of each telescopic rod 73. When the telescopic rod 73 rotates with the first rotating shaft 62, the connecting ring 711 contacts the top of the check block 78. The end of the telescopic rod 73 contacts the connecting ring 711 as much as possible. Adjustment grooves 710 are provided at the ends of the three clamping plates 66. The inside of the adjustment grooves 710 A sliding connection check block 78 is provided, and two connected second connecting rods 77 are arranged between the end of the check block 78 and the side wall of the clamping plate 66. The ends of the intersections of the two second connecting rods 77 are provided with teeth 79 that mesh with each other. The end of the check block 78 contacts the connecting ring 711. The lifting second nut seat 72 can press the telescopic rod 73 and the connecting ring 711 downward so that the check block 78 is also pressed downward. The two second connecting rods 77 are deformed, thereby lowering the check block 78 along the inside of the adjustment groove 710. The three check blocks 78 contact the surface of the clamping plate 4. The end of the first rotating rod 5 is movably connected to the clamping plate 4. The downward pressed check block 78 can press the clamping plate 4 downward to ensure that the position of the clamping plate 4 does not change, and the pressurized pressure can be kept constant to ensure that the insulating parts in the transformer winding are fully compressed during the entire drying process.

[0039] See also Figure 6 and Figure 7 As shown, the internal rotation of the chassis 1 is connected with a second rotating rod 8, and a second bevel gear set 71 is arranged between the end of the second rotating rod 8 and the end of the first rotating shaft 62. The second bevel gear set 71 is composed of two bevel gears meshing with each other. A bevel gear of the second bevel gear set 71 and a bevel gear of the first bevel gear set 61 are coaxial and rotate relatively. When the second rotating rod 8 rotates, the second bevel gear set 71 can be rotated, thereby driving the second rotating shaft 75 located inside the first rotating shaft 62 to rotate. The rotation of the first rotating shaft 62 will drive the second rotating shaft 75 to rotate, so that the connecting ring 711 contacts the check block 78 and presses the check block 78, and the check block 78 can press the clamping plate 4.

[0040] See also Figure 6 and Figure 8As shown, a sliding groove 74 is provided at the upper end of the first rotating shaft 62, and the end of the second rotating shaft 75 and the end of the first rotating shaft 62 both pass through the interior of the second nut seat 72. The sliding groove 74 is slidably connected to the second nut seat 72, and the connecting ring 711 is always in contact with the upper end of the check block 78. The rotation of the second rotating shaft 75 will drive the first rotating shaft 62 and the second rotating shaft 75 to rotate relative to each other, and the second thread 76 of the second rotating shaft 75 is transmitted to the second nut seat 72, so that the second nut seat 72 and the telescopic rod 73 are raised and lowered, and the check block 78 can be pressed down.

[0041] See also Figure 6 and Fig. 9 As shown, the two second connecting rods 77 are of equal length, the check block 78 is composed of two connecting blocks welded to each other, the check block 78 is movably connected to the end of one of the second connecting rods 77, and the clamping plate 66 is movably connected to the end of the other second connecting rod 77. The check block 78 can be welded inside the adjustment groove 710, and the position of the check block 78 can be clamped by using the connecting ring 711 and the second connecting rod 77 to avoid the position change of the check block 78 at a later time.

[0042] See also Fig.10 As shown, a drying structure 9 is provided inside the three clamping plates 66, and the drying structure 9 includes a vent pipe 91, which is embedded in the inside of the clamping plate 66, and a row of fixing grooves 92 are provided on both side walls of the clamping plate 66. A vent nozzle 93 is provided in the middle of the vent pipe 91 and inside the fixing groove 92, and the two rows of vent nozzles 93 are arranged obliquely to both sides. A connecting hose 94 is connected to the bottom end of the vent pipe 91, and the connecting hose 94 is connected to the hot air blower. The hot air enters the inside of the connecting hose 94 from the hot air blower, and then the hot air enters the inside of the vent pipe 91 and the vent nozzle 93, so that the hot air can be introduced into the gap of the transformer winding, thereby drying the inside of the gap of the transformer winding, removing moisture in the transformer insulating material, increasing its insulation resistance, and improving its flashover voltage. The device can also be placed as a whole in a drying device for drying.

[0043] When the present invention is in use, a series of treatments need to be performed on the transformer winding during the production of the transformer winding. The transformer winding is installed on the support column 3, and the fixing plate 2 and the pressing plate 4 are placed on the top of the support column 3, and the support column 3 and the fixing plate 2 are screwed together. At this time, the fixing plate 2 can be fixed above the support column 3, and then the transformer winding is fixedly clamped by the clamping structure 6. Specifically, the first rotating rod 5 is rotated so that the first rotating rod 5 drives the first bevel gear set 61 to rotate, and the first rotating shaft 62 rotates with one of the bevel gears, and the first thread 63 of the first rotating shaft 62 is transmitted with the first nut seat 64, so that the two first nut seats 64 are fixed. When the first nut seats 64 are moved closer to each other, the first nut seats 64 can be limited by the limiting ring 69. At this time, the first connecting rod 65 connecting the two first nut seats 64 will also be deformed. At this time, the clamping plates 66 at the ends of the two first connecting rods 65 will be deformed toward the outside of the support column 3, so that the unfolded clamping plates 66 can clamp the inner wall of the transformer winding, ensuring that the diameter of the circle where the three clamping plates 66 are located is constant, so as to avoid a large change in the diameter of the transformer winding due to pressure applied thereto in the later stage. The first rotating rod 5 is rotated in the opposite direction, so that the first nut seats 64 can be moved away from each other, so that the clamping plates 66 are input into the reserved groove 67 of the support column 3, and the pressurized winding can be taken out at this time;

[0044] When processing the transformer winding, it is necessary to pressurize the transformer winding. During the drying process, a constant pressure is always applied to the winding in the axial direction. In this way, the insulating parts in the winding can be fully compressed during the entire drying process, thereby improving the performance and service life of the transformer in preventing short circuits. The cylinder 10 at the fixed disk 2 is extended to press the clamping disk 4 against the top of the transformer winding. The clamped transformer winding is compressed by the clamping disk 4, so that pressure is applied to the transformer winding. When applying pressure, avoid large changes in the position of the clamping disk 4. At this time, The position of the clamping plate 4 will not change through the constant pressure component 7. Specifically, the second rotating rod 8 is rotated, and the second bevel gear set 71 drives the second rotating shaft 75 inside the first rotating shaft 62 to rotate. The second thread 76 of the second rotating shaft 75 is transmitted with the second nut seat 72, so that the second nut seat 72 moves up and down in the vertical direction, and the second nut seat 72, the telescopic rod 73 and the connecting ring 711 will rise and fall synchronously. Since a reserved opening is opened at the position corresponding to the check block 78 and the clamping plate 4, the lifting and lowering of the clamping plate 4 will pass through the reserved opening, thereby The locking cam 78 is pressed against the locking cam 74 to thereby secure the locking cam 74 against the impact of the locking cam 76. The locking cam 78 is pressed against the support cam 74 to thereby secure the locking cam 74 against the impact of the locking cam 76. The connecting ring 711 also moves upward, so that the pressure plate 4 can be rotated at this time so that the reserved opening of the pressure plate 4 is aligned with the position of the check block 78, and the cylinder 10 is extended and retracted so that the pressure plate 4 can be raised and lowered; it should be noted that when the first rotating shaft 62 is rotated, the second nut seat 72 also rotates with the first rotating shaft 62, so that the connecting ring 711 at the end of the telescopic rod 73 will contact the check block 78, even if the position of the clamping plate 66 changes greatly, the second rotating shaft 75 can be rotated alone, so that the telescopic rod 73 is rotated to a position aligned with the clamping plate 66 to limit the position of the check block 78;

[0045] In addition to ensuring a certain pressure between the windings, the insulating material of the windings must also be kept dry. At this time, the windings can be dried by hot air blown out by a hot air blower. Specifically, the hot air from the hot air blower enters the vent pipe 91 from the connecting hose 94, and sprays hot air through the vent nozzle 93 inside the fixed groove 92, thereby spraying the vent nozzle 93 into the winding gap. Since the transformer winding has not been pressurized, the hot air can more easily enter the transformer gap, dry the inside of the transformer winding gap, remove moisture from the transformer insulating material, increase its insulation resistance, and increase its flashover voltage.

[0046] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A transformer winding drying constant pressure structure, comprising a chassis (1), a fixed disk (2), a support column (3), a pressure plate (4) and a cylinder (10), wherein the support column (3) is arranged between the chassis (1) and the fixed disk (2), the top end of the support column (3) is screwed with the fixed disk (2), and the cylinder (10) is arranged around the edge of the fixed disk (2) and the pressure plate (4); characterized in that: The support column (3) is provided with a clamping structure (6) inside, the clamping structure (6) comprising three groups of reserved grooves (67), the three groups of reserved grooves (67) being provided on the side wall of the support column (3), the support column (3) being rotatably connected with a first rotating shaft (62), the middle of the first rotating shaft (62) being provided with two groups of first threads (63), the thread rotation directions of the upper and lower first threads (63) being opposite, the first threads (63) being threadedly connected with first nut seats (64), and the two first nut seats (64) being provided with a plurality of first threads (63). The movement directions are opposite, the edges of the two first nut seats (64) are connected to three first connecting rods (65), both ends of the first connecting rods (65) are connected to connecting pins (68), a clamping plate (66) is connected between the ends of the upper and lower first connecting rods (65) on the same side, the clamping plate (66) is located inside the reserved groove (67), the interior of the chassis (1) is rotatably connected to the first rotating rod (5), and a first bevel gear set (61) is provided between the end of the first rotating rod (5) and the end of the first rotating shaft (62); The first bevel gear set (61) is composed of two bevel gears meshing with each other, and the two bevel gears are respectively fixed to the end of the first rotating rod (5) and the end of the first rotating shaft (62), and the first rotating shaft (62) is rotatably connected to the inner ends of the support column (3); The three clamping plates (66) and the three first connecting rods (65) on the first nut seat (64) are arranged in a circular array, and the first connecting rods (65) arranged up and down are of the same length, and the area surrounded by the upper and lower first connecting rods (65), the support column (3) and the clamping plates (66) is an isosceles trapezoid, and the diameter of the circle where the three clamping plates (66) are located is adjustable; Limiting rings (69) are welded to the ends of the two first threads (63) and are located near the middle of the first rotating shaft (62); the diameter of the limiting rings (69) is larger than the nominal diameter of the first threads (63); A constant pressure assembly (7) is provided at the inner upper end of the support column (3) and located at the pressure plate (4), and the constant pressure assembly (7) includes a second rotating shaft (75), the second rotating shaft (75) is located inside the first rotating shaft (62), the first rotating shaft (62) and the second rotating shaft (75) rotate relative to each other, a second thread (76) is provided at the upper end of the second rotating shaft (75), a second nut seat (72) is sleeved at the end of the second thread (76), the second nut seat (72) is threadedly connected to the second thread (76), and three telescopic rods (73) are welded to the side wall of the second nut seat (72), each telescopic rod (73) ) is welded with a connecting ring (711), the ends of the three clamping plates (66) are each provided with an adjustment groove (710), the inside of the adjustment groove (710) is slidably connected to a check block (78), two connected second connecting rods (77) are provided between the end of the check block (78) and the side wall of the clamping plate (66), the ends of the two second connecting rods (77) are each provided with teeth (79) that mesh with each other, the end of the check block (78) is in contact with the connecting ring (711), the three check blocks (78) are in contact with the surface of the clamping plate (4), and the end of the first rotating rod (5) is movably connected to the clamping plate (4).

2. A transformer winding drying constant voltage structure according to claim 1, characterized in that: A second rotating rod (8) is rotatably connected inside the chassis (1); a second bevel gear set (71) is provided between an end of the second rotating rod (8) and an end of the first rotating shaft (62); the second bevel gear set (71) is composed of two bevel gears meshing with each other; a bevel gear of the second bevel gear set (71) and a bevel gear of the first bevel gear set (61) are coaxial and rotate relative to each other.

3. A transformer winding drying constant voltage structure according to claim 2, characterized in that: A sliding groove (74) is provided at the upper end of the first rotating shaft (62), the end of the second rotating shaft (75) and the end of the first rotating shaft (62) both pass through the interior of the second nut seat (72), the sliding groove (74) is slidably connected to the second nut seat (72), and the connecting ring (711) is always in contact with the upper end of the check block (78).

4. A transformer winding drying constant voltage structure according to claim 3, characterized in that: The two second connecting rods (77) are of equal length, the check block (78) is composed of two connecting blocks welded to each other, the check block (78) is movably connected to the end of one of the second connecting rods (77), and the clamping plate (66) is movably connected to the end of the other second connecting rod (77).

5. A transformer winding drying constant voltage structure according to any one of claims 1 to 4, characterized in that: A drying structure (9) is arranged inside each of the three clamping plates (66), and the drying structure (9) comprises a ventilation pipe (91). The ventilation pipe (91) is embedded inside the clamping plate (66), and a row of fixing grooves (92) are provided on both side walls of the clamping plate (66). A ventilation nozzle (93) is arranged in the middle of the ventilation pipe (91) and inside the fixing groove (92), and the two rows of ventilation nozzles (93) are arranged obliquely toward both sides. A connecting hose (94) is connected to the bottom end of the ventilation pipe (91), and the connecting hose (94) is connected to the hot air blower.

Images