Powder screening machine for dry-type transformer castable

Abstract

The invention discloses a dry-type transformer castable powder screening machine, and relates to the technical field of powder screening, the dry-type transformer castable powder screening machine comprises a base, the base is used for fixedly supporting a screening component, a supporting frame is fixedly mounted at the edge of the top of the base, and a rotating shaft feeding guide piece is rotatably mounted at the top of the supporting frame. According to the powder screening machine for the dry-type transformer castable, due to the fact that raw materials contain a large amount of dust, part of the powdery raw materials are prone to caking, the feeding port is prone to being blocked by the large amount of the raw materials during pouring, and the raw materials are stacked in the material guiding folding pipe, vibration receiving frames are arranged on the two sides of the material guiding folding pipe; the raw materials slide downwards at the moment of dumping, so that the vibration receiving frame is impacted by the raw materials to generate displacement, the inclination angle of the vibration receiving frame is changed, the raw materials are conveniently discharged from the guide folding pipe, the surface of the vibration receiving frame is arranged to be zigzag, the zigzag structure primarily disperses the raw materials when the raw materials impact downwards and make contact with the surface of the vibration receiving frame, and the caking phenomenon in the raw materials is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of powder screening, in particular to a powder screening machine for dry-type transformer casting material. Background Art

[0002] Transformer castable is a kind of amorphous refractory material composed of granular and powdery materials made of refractory substances, and a certain amount of binder and water are added to form it. It has high fluidity, is suitable for construction by pouring method, and can harden without heating. This material is generally composed of refractory aggregate, powder, binder, admixture, water or other liquid materials. It can be cast and formed by pouring, vibration or tamping at the site of use, or it can be made into prefabricated parts for use. The main purpose of transformer castable is for insulation and protection of dry-type transformers. It is fixed to the coil and core of the transformer by pouring to improve the electrical performance and mechanical strength of the transformer, while protecting the transformer from the influence of the external environment. A screening machine is a machine that utilizes the relative movement between bulk material and the screen surface to allow some particles to pass through the screen holes, thereby separating the material into different grades and specifications according to the particle size. At present, screening is the process of breaking up loose materials through one or more layers of screen surfaces and being divided into different particle sizes. The screening machine utilizes the relative movement between bulk material and the screen surface to allow particles with smaller particle sizes to pass through the screen holes, while isolating sand, gravel, and crushed stone with larger particle sizes in the upper layer, thereby achieving separation of particles and impurities. In the related technology, powders are easily affected by moisture after being placed for a long time, so that the powders are easy to stick to or cover each other and thus form lumps or powder balls. Summary of the invention

[0003] To achieve the above objectives, the present invention is implemented through the following technical solutions: A powder screening machine for dry-type transformer casting material, comprising a base, the base is used for fixed support of the screening component, a support frame is fixedly installed at the top edge of the base, and a rotating shaft is rotatably installed on the top of the support frame A material feed guide, which is used for guiding the casting material by vibration; A screening component, which is used for filtering and screening castable materials, and a motor is fixedly installed on the top of the screening component; The feed guide is fixedly mounted on the top of the support frame, the support frame is fixedly mounted on one side of the outer surface of the screening assembly, and the screening assembly is fixedly mounted on the top of the base; in the process of transformer production, the staff needs to screen the castable raw materials for powder. The staff first pours the raw materials into the feed guide, and the raw materials slide into the screening assembly along the feed guide. Then the staff starts the motor so that the output end of the motor drives the screening assembly to rotate so as to drive the raw materials in the screening assembly to be stirred and screened. After stirring and dispersing, the raw materials fall to the bottom of the screening assembly.

[0004] Among them, the material feed guide includes a material guide folded tube, the top of the material guide folded tube is provided with a material feed port, the bottom of the material guide folded tube is provided with a material discharge port, the inner wall of the material guide folded tube is fixedly connected with a shaking frame, and the shaking frames are provided with two groups, and the two groups of shaking frames are symmetrically arranged with the material feed port as the center.

[0005] Since the raw materials contain a large amount of dust and some powdered raw materials are prone to agglomeration, a large amount of raw materials can easily cause the feed port to be blocked when pouring, and the raw materials are accumulated in the material guide folding tube. Therefore, vibration frames are arranged on both sides of the material guide folding tube. At the moment the raw materials are poured, the raw materials slide downward, causing the vibration frames to be displaced by the impact of the raw materials and change their inclination angle to facilitate the discharge of the raw materials from the material guide folding tube. The surface of the vibration frame is arranged to be serrated. When the raw materials impact downward and contact with its surface, the serrated structure performs primary dispersion of the raw materials to reduce agglomeration in the raw materials.

[0006] Preferably, the screening component includes an outer cover, a sealing cover is fixedly installed on the top of the outer cover, the motor is fixedly installed at the middle of the top of the sealing cover, a sub-screening cover is fixedly installed inside the outer cover, and a drain pan is fixedly installed on the top of the sub-screening cover. The screening component is set to a double-layer structure, the raw materials are introduced into the sub-screening cover along the feed guide, and the staff starts the motor so that the motor drives the scattering piece to rotate, stirs the raw materials in the sub-screening cover, and the raw materials are sieved out from under the scattering piece.

[0007] Preferably, a dispersing piece is fixedly installed inside the drain plate, the dispersing piece is fixedly installed at the output end of the motor, a knocking piece is fixedly installed on the top of the outer surface of the dispersing piece, and an elastic piece is fixedly installed inside the dispersing piece. When the dispersing piece drives the elastic piece to rotate, the telescopic airbag and the sieve plate are squeezed, causing the telescopic airbag to deform, so that the elastic piece moves inside the dispersing piece to disperse the agglomerated raw materials and speed up the powder screening speed.

[0008] Preferably, the dispersing part includes a circular shaft, which is fixedly connected to the output end of the motor, a triangular plate is fixedly installed on the top of the circular shaft, a telescopic airbag is fixedly installed on the bottom of the circular shaft, side support blocks are fixedly installed on both sides of the outer surface of the telescopic airbag, a sieve plate is rotatably installed on the bottom of the side support block, and the outer surface of the sieve plate is covered with a round cover.

[0009] Preferably, the spreading piece is fixedly mounted on the top of the outer surface of the circular cover, and extrusion pads are fixedly mounted on both sides of the outer surface of the circular cover, and the extrusion pads are extruded and adapted to the inner wall of the sub-screening cover.

[0010] Preferably, the elastic member comprises a fixed block, a compression spring is fixedly connected to the top of the fixed block, an output end of the compression spring is fixedly connected to a top block, and a first spring plate and a second spring plate are fixedly connected to the bottom of the top block.

[0011] Preferably, the outer surfaces of the first spring plate and the second spring plate are fixedly connected with a fixed block, and the opposite surfaces of the first spring plate and the second spring plate are fixedly connected with an elastic rope. During the raw material screening time, the staff starts the motor to make the telescopic airbag push inward in the round cover to apply force to the first spring plate and the second spring plate, so that they are deformed and move upward, and push the top block and stretch the compression spring during the movement, and the compression spring applies force to the first spring plate and the second spring plate, so as to achieve the effect of repeated movement, so as to make the raw material shake in the round cover, increase the activity of the raw material during screening, and make the raw material screening more uniform.

[0012] Preferably, the knocking member comprises a fixed shell, the fixed shell is fixedly mounted on the top of the outer surface of the circular cover, a sleeve is fixedly mounted on the outer surface of the fixed shell, and a hemispherical sleeve is fixedly mounted on the outer surface of the sleeve.

[0013] Preferably, a bent piece is fixedly mounted on the inner wall of the sleeve, a telescopic band is fixedly mounted between opposite surfaces of the bent piece, a locking ball is fixedly mounted on both sides of the outer surface of the bent piece, and a rubber rod is fixedly mounted on the surface of the bent piece away from the locking ball.

[0014] Preferably, a paddle is fixedly mounted on the outer surface of the rubber rod, the paddle is clamped inside the hemispherical casing, and the paddle is squeezed and adapted with the extrusion pad. Through the cooperation between the bent piece and the fixed shell, when vibration occurs, the paddle moves inward while rubbing against the extrusion pad, driving the bent piece to slide. When the bent piece moves to the end of the fixed shell, it deforms, and elastic force is applied to the paddle to achieve the effect of secondary vibration. The force of the telescopic belt causes the bent piece to merge, avoiding the bent piece from being compressed when the vibration is too strong, resulting in irreversible deformation, thereby protecting the bent piece. The stuck ball repeatedly hits the inner wall of the casing during vibration, increasing the vibration frequency, better preventing adhesion, increasing the contact area with the round cover, and accelerating the screening speed.

[0015] The present invention provides a powder screening machine for dry-type transformer casting material, which has the following beneficial effects: 1. The powder screening machine of the dry-type transformer casting material has a large amount of dust in the raw materials, and some powdered raw materials are prone to agglomeration. When pouring, a large amount of raw materials is prone to block the feed port, and the raw materials are accumulated in the guide folding tube. Therefore, a vibration frame is arranged on both sides of the guide folding tube. At the moment of pouring the raw materials, the raw materials slide downward, so that the vibration frame is displaced by the impact of the raw materials and changes its inclination angle, so that the raw materials can be discharged from the guide folding tube. The surface of the vibration frame is set to a serrated shape. When the raw materials impact downward and contact with its surface, the serrated structure performs primary dispersion on the raw materials to reduce the agglomeration phenomenon in the raw materials.

[0016] 2. The powder screening machine of the dry-type transformer casting material is set as a double-layer structure through the screening component. The raw materials are introduced into the sub-screening cover along the feed guide. The staff starts the motor to make the motor drive the scattering piece to rotate, stir the raw materials in the sub-screening cover, so that the raw materials are screened out from under the scattering piece. When the scattering piece drives the elastic piece to rotate, the telescopic airbag and the sieve plate are squeezed, causing the telescopic airbag to deform, so that the elastic piece moves in the scattering piece to break up the agglomerated raw materials and speed up the powder screening speed.

[0017] 3. The powder screening machine of the dry-type transformer castable material, during the transformer production process, the staff needs to screen the castable raw materials for powder. The staff first pours the raw materials into the feed guide, and the raw materials slide into the screening component along the feed guide, and then the staff starts the motor to make the motor output end drive the screening component to rotate to drive the raw materials in the screening component to be stirred and screened, and the raw materials fall to the bottom of the screening component after stirring and dispersion.

[0018] 4. The powder screening machine for the dry-type transformer casting material, when the raw material is screened, the staff starts the motor to make the telescopic airbag push inward in the round cover to apply force to the first spring plate and the second spring plate, so that it deforms and moves upward, pushes the top block and stretches the compression spring during movement, and the compression spring applies force to the first spring plate and the second spring plate, thereby achieving the effect of repeated movement, making the raw material shake in the round cover, increasing the activity of the raw material during screening, and making the raw material screening more uniform.

[0019] 5. The powder screening machine of the dry-type transformer castable, through the cooperation between the bent sheet and the fixed shell, when vibration occurs, the paddle and the extrusion pad rub against each other and move inward, driving the bent sheet to slide. When the bent sheet moves to the end of the fixed shell, it deforms and applies elastic force to the paddle to achieve the effect of secondary vibration. The force of the telescopic belt causes the bent sheet to merge, avoiding the bent sheet from being compressed and deformed irreversibly when the vibration is too strong, thereby protecting the bent sheet. The card ball repeatedly hits the inner wall of the casing during vibration, increasing the vibration frequency, better preventing adhesion, increasing the contact area between the raw material and the round cover, and accelerating the screening speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the external structure of a powder screening machine for dry-type transformer casting material of the present invention; Figure 2 It is a schematic diagram of the external structure of a powder screening machine for dry-type transformer casting material according to the present invention from another angle; Figure 3 This is a schematic diagram of the structure of the feed guide of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the screening assembly of the present invention; Figure 5It is a schematic diagram of the internal cross-sectional structure of the screening assembly of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the dispersing member of the present invention; Figure 7 It is a schematic diagram of the structure of the elastic member of the present invention; Figure 8 It is a schematic diagram of the structure of the striking member of the present invention.

[0021] In the figure: 1, rotating shaft; 2, motor; 3, screening assembly; 31, sealing cover; 32, outer cover; 33, screening cover; 34, leakage plate; 35, scattering piece; 351, round shaft; 352, triangular plate; 353, round cover; 354, telescopic airbag; 355, side support block; 356, squeeze pad; 357, sieve plate; 36, knocking piece; 361, fixed shell; 362, telescopic belt; 363, sleeve; 364 , hemispherical shell; 365, dial plate; 366, rubber rod; 367, bending piece; 368, card ball; 37, elastic member; 371, top block; 372, compression spring; 373, fixed block; 374, first spring plate; 375, elastic rope; 376, second spring plate; 4, base; 5, feed guide; 51, feed port; 52, shaking frame; 53, discharge port; 54, guide folding tube; 6, support frame. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0023] The first embodiment, as Figures 1 to 3 As shown, the present invention provides a technical solution: a powder screening machine for dry transformer casting material, comprising a base 4, the base 4 is used for fixed support of the screening component, a support frame 6 is fixedly installed at the top edge of the base 4, and a rotating shaft 1 is rotatably installed on the top of the support frame 6 A material feeding guide 5, which is used for guiding the casting material by vibration; A screening component 3, which is used for filtering and screening castable materials, and a motor 2 is fixedly installed on the top of the screening component 3; The feed guide 5 is fixedly mounted on the top of the support frame 6, the support frame 6 is fixedly mounted on one side of the outer surface of the screening component 3, and the screening component 3 is fixedly mounted on the top of the base 4; in the process of transformer production, the staff needs to screen the castable raw materials for powder. The staff first pours the raw materials into the feed guide 5, and the raw materials slide into the screening component 3 along the feed guide 5, and then the staff starts the motor 2 so that the output end of the motor 2 drives the screening component 3 to rotate to drive the raw materials in the screening component 3 to be stirred and screened, and the raw materials fall to the bottom of the screening component 3 after stirring and dispersion.

[0024] Among them, the material feed guide 5 includes a material guide folded tube 54, the top of the material guide folded tube 54 is provided with a material feed port 51, the bottom of the material guide folded tube 54 is provided with a material discharge port 53, the inner wall of the material guide folded tube 54 is fixedly connected with a shaking frame 52, and the shaking frame 52 is provided with two groups, and the two groups of shaking frames 52 are symmetrically arranged with the material feed port 51 as the center.

[0025] Since the raw materials contain a large amount of dust and some powdered raw materials are prone to agglomeration, a large amount of raw materials can easily cause the feed port 51 to be blocked when pouring, and the raw materials accumulate in the material guide folding tube 54. Therefore, shaking frames 52 are arranged on both sides of the material guide folding tube 54. At the moment the raw materials are poured, the raw materials slide downward, so that the shaking frames 52 are displaced by the impact of the raw materials and change their inclination angle to facilitate the discharge of the raw materials from the material guide folding tube 54. The surface of the shaking frame 52 is arranged to be serrated. When the raw materials impact downward and contact with its surface, the serrated structure performs primary dispersion of the raw materials to reduce agglomeration in the raw materials.

[0026] The second embodiment is based on the first embodiment. Figures 4 to 7 As shown, the screening assembly 3 includes an outer cover 32, a sealing cover 31 is fixedly installed on the top of the outer cover 32, the motor 2 is fixedly installed at the middle of the top of the sealing cover 31, a sub-screening cover 33 is fixedly installed inside the outer cover 32, and a drain pan 34 is fixedly installed on the top of the sub-screening cover 33. The screening assembly 3 is set as a double-layer structure, and the raw materials are introduced into the sub-screening cover 33 along the feed guide 5. The staff starts the motor 2 so that the motor 2 drives the scattering piece 35 to rotate, and stirs the raw materials in the sub-screening cover 33, so that the raw materials are screened out from below the scattering piece 35.

[0027] A dispersing member 35 is fixedly installed inside the drain pan 34, and the dispersing member 35 is fixedly installed at the output end of the motor 2. A knocking member 36 is fixedly installed on the top of the outer surface of the dispersing member 35, and an elastic member 37 is fixedly installed inside the dispersing member 35. When the dispersing member 35 drives the elastic member 37 to rotate, the telescopic airbag 354 and the sieve pan 357 are squeezed, so that the telescopic airbag 354 is deformed, so that the elastic member 37 moves inside the dispersing member 35 to disperse the agglomerated raw materials and speed up the powder screening speed.

[0028] The dispersing member 35 includes a circular shaft 351, which is fixedly connected to the output end of the motor 2. A triangular plate 352 is fixedly installed on the top of the circular shaft 351, and a telescopic airbag 354 is fixedly installed on the bottom of the circular shaft 351. Side support blocks 355 are fixedly installed on both sides of the outer surface of the telescopic airbag 354. A sieve plate 357 is rotatably installed on the bottom of the side support block 355, and the outer surface of the sieve plate 357 is sleeved with a round cover 353.

[0029] The spreading piece 35 is fixedly mounted on the top of the outer surface of the circular cover 353 , and squeezing pads 356 are fixedly mounted on both sides of the outer surface of the circular cover 353 . The squeezing pads 356 are squeezed and adapted to the inner wall of the sub-screen cover 33 .

[0030] The elastic member 37 includes a fixed block 373 , a compression spring 372 is fixedly connected to the top of the fixed block 373 , an output end of the compression spring 372 is fixedly connected to a top block 371 , and a first elastic plate 374 and a second elastic plate 376 are fixedly connected to the bottom of the top block 371 .

[0031] The outer surfaces of the first spring plate 374 and the second spring plate 376 are fixedly connected with a fixed block 373, and the opposite surfaces of the first spring plate 374 and the second spring plate 376 are fixedly connected with an elastic rope 375. During the raw material screening, the staff starts the motor 2 so that the telescopic airbag 354 pushes the first spring plate 374 and the second spring plate 376 inward in the round cover 353 to apply force to the first spring plate 374 and the second spring plate 376, so that they are deformed and move upward, and push the top block 371 and stretch the compression spring 372 during the movement, and the compression spring 372 applies force to the first spring plate 374 and the second spring plate 376, so as to achieve the effect of repeated movement, so as to make the raw materials shake in the round cover 353, increase the activity of the raw materials during screening, and make the raw materials screened more evenly.

[0032] The third embodiment is based on the first and second embodiments. Figure 8 As shown, the knocking member 36 includes a fixed shell 361, which is fixedly mounted on the top of the outer surface of the circular cover 353, a sleeve 363 is fixedly mounted on the outer surface of the fixed shell 361, and a hemispherical sleeve 364 is fixedly mounted on the outer surface of the sleeve 363.

[0033] A bent piece 367 is fixedly installed on the inner wall of the sleeve 363, a retractable belt 362 is fixedly installed between the opposite surfaces of the bent piece 367, a locking ball 368 is fixedly installed on both sides of the outer surface of the bent piece 367, and a rubber rod 366 is fixedly installed on the surface of the bent piece 367 away from the locking ball 368.

[0034] The outer surface of the rubber rod 366 is fixedly mounted with a paddle 365, which is clamped inside the hemispherical casing 364 and is squeezed and adapted with the extrusion pad 356. Through the cooperation between the curved sheet 367 and the fixed shell 361, when vibration occurs, the paddle 365 moves inward while rubbing against the extrusion pad 356, driving the curved sheet 367 to slide. When the curved sheet 367 moves to the end of the fixed shell 361, it deforms, and applies elastic force to the paddle 365, achieving the effect of secondary vibration. The elastic band 362 is forced to merge the curved sheet 367, so as to prevent the curved sheet 367 from being compressed and deformed irreversibly when the vibration is too strong, thereby protecting the curved sheet 367. The card ball 368 repeatedly hits the inner wall of the sleeve 363 during vibration, increasing the vibration frequency, better preventing adhesion, increasing the contact area between the raw material and the round cover 353, and accelerating the screening speed.

[0035] When in use, during the transformer production process, the staff needs to screen the powder of the castable raw material. The staff first pours the raw material into the feed guide 5, and the raw material slides into the screening component 3 along the feed guide 5, and then the staff starts the motor 2 so that the output end of the motor 2 drives the screening component 3 to rotate to drive the raw material in the screening component 3 to be stirred and screened. After stirring and dispersing, the raw material falls to the bottom of the screening component 3.

[0036] Since the raw materials contain a large amount of dust and some powdered raw materials are prone to agglomeration, a large amount of raw materials can easily cause the feed port 51 to be blocked when pouring, and the raw materials accumulate in the material guide folding tube 54. Therefore, shaking frames 52 are arranged on both sides of the material guide folding tube 54. At the moment the raw materials are poured, the raw materials slide downward, so that the shaking frames 52 are displaced by the impact of the raw materials and change their inclination angle to facilitate the discharge of the raw materials from the material guide folding tube 54. The surface of the shaking frame 52 is arranged to be serrated. When the raw materials impact downward and contact with its surface, the serrated structure performs primary dispersion of the raw materials to reduce agglomeration in the raw materials.

[0037] The screening component 3 is configured as a double-layer structure. The raw materials are introduced into the sub-screening cover 33 along the feed guide 5. The staff starts the motor 2 so that the motor 2 drives the scattering piece 35 to rotate, stirring the raw materials in the sub-screening cover 33 so that the raw materials are screened out from under the scattering piece 35.

[0038] When the scattering member 35 drives the elastic member 37 to rotate, the telescopic airbag 354 and the sieve plate 357 are squeezed, causing the telescopic airbag 354 to deform, so that the elastic member 37 can move in the scattering member 35 to break up the agglomerated raw materials and speed up the powder screening speed.

[0039] During the raw material screening process, the staff starts the motor 2 so that the telescopic airbag 354 pushes inward in the round cover 353 to apply force to the first spring plate 374 and the second spring plate 376, causing them to deform and move upward. During the movement, the top block 371 is pushed and the compression spring 372 is stretched. The compression spring 372 in turn applies force to the first spring plate 374 and the second spring plate 376, thereby achieving the effect of repeated movement, allowing the raw materials to shake in the round cover 353, increasing the activity of the raw materials during screening, and making the raw materials screened more evenly.

[0040] Through the cooperation between the bent piece 367 and the fixed shell 361, when vibration occurs, the paddle 365 moves inward while rubbing against the extrusion pad 356, driving the bent piece 367 to slide. When the bent piece 367 moves to the end of the fixed shell 361, it is deformed, applying elastic force to the paddle 365 to achieve the effect of secondary vibration. The telescopic belt 362 is forced to merge the bent piece 367 to prevent the bent piece 367 from being compressed and deformed irreversibly when the vibration is too strong, thereby protecting the bent piece 367. The card ball 368 repeatedly hits the inner wall of the sleeve 363 during vibration to increase the vibration frequency, better prevent adhesion, increase the contact area between the raw material and the round cover 353, and speed up the screening speed.

[0041] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A powder screening machine for dry-type transformer casting material, characterized in that: include: A base (4) is used for fixedly supporting the screening component, a support frame (6) is fixedly mounted at the top edge of the base (4), and a rotating shaft (1) is rotatably mounted at the top of the support frame (6) A material feeding guide (5), the material feeding guide (5) is used for guiding the casting material by vibration; A screening component (3), the screening component (3) being used for filtering and screening castable materials, a motor (2) being fixedly mounted on the top of the screening component (3); The feed guide (5) is fixedly mounted on the top of the support frame (6), the support frame (6) is fixedly mounted on one side of the outer surface of the screening component (3), and the screening component (3) is fixedly mounted on the top of the base (4); The feed guide (5) comprises a material guide folded tube (54), a material feed port (51) is provided at the top of the material guide folded tube (54), a material discharge port (53) is provided at the bottom of the material guide folded tube (54), a vibration connecting frame (52) is fixedly connected to the inner wall of the material guide folded tube (54), and two groups of the vibration connecting frames (52) are provided, and the two groups of the vibration connecting frames (52) are symmetrically arranged with the material feed port (51) as the center.

2. The powder screening machine for dry-type transformer casting material according to claim 1 is characterized in that: The screening assembly (3) comprises an outer cover (32), a sealing cover (31) is fixedly mounted on the top of the outer cover (32), the motor (2) is fixedly mounted at the middle of the top of the sealing cover (31), a sub-screening cover (33) is fixedly mounted inside the outer cover (32), and a drain pan (34) is fixedly mounted on the top of the sub-screening cover (33).

3. The powder screening machine for dry-type transformer casting material according to claim 2 is characterized in that: A spreading piece (35) is fixedly mounted inside the leakage disc (34), the spreading piece (35) is fixedly mounted on the output end of the motor (2), a knocking piece (36) is fixedly mounted on the top of the outer surface of the spreading piece (35), and an elastic piece (37) is fixedly mounted inside the spreading piece (35).

4. The powder screening machine for dry-type transformer casting material according to claim 3 is characterized in that: The spreading member (35) comprises a circular shaft (351), the circular shaft (351) being fixedly connected to the output end of the motor (2), a triangular plate (352) being fixedly mounted on the top of the circular shaft (351), a telescopic airbag (354) being fixedly mounted on the bottom of the circular shaft (351), side support blocks (355) being fixedly mounted on both sides of the outer surface of the telescopic airbag (354), a sieve plate (357) being rotatably mounted on the bottom of the side support blocks (355), and a round cover (353) being sleeved on the outer surface of the sieve plate (357).

5. The powder screening machine for dry-type transformer casting material according to claim 4, characterized in that: The spreading piece (35) is fixedly mounted on the top of the outer surface of the circular cover (353), and squeezing pads (356) are fixedly mounted on both sides of the outer surface of the circular cover (353), and the squeezing pads (356) are squeezed and adapted to the inner wall of the sub-screen cover (33).

6. The powder screening machine for dry-type transformer casting material according to claim 3 is characterized in that: The elastic member (37) comprises a fixed block (373), the top of the fixed block (373) is fixedly connected to a compression spring (372), the output end of the compression spring (372) is fixedly connected to a top block (371), and the bottom of the top block (371) is fixedly connected to a first elastic plate (374) and a second elastic plate (376).

7. The powder screening machine for dry-type transformer casting material according to claim 6, characterized in that: The outer surfaces of the first spring plate (374) and the second spring plate (376) are fixedly connected with a fixing block (373), and the opposite surfaces of the first spring plate (374) and the second spring plate (376) are fixedly connected with an elastic rope (375).

8. The powder screening machine for dry-type transformer casting material according to claim 3 is characterized in that: The knocking member (36) comprises a fixed shell (361), the fixed shell (361) being fixedly mounted on the top of the outer surface of the circular cover (353), a sleeve (363) being fixedly mounted on the outer surface of the fixed shell (361), and a hemispherical sleeve (364) being fixedly mounted on the outer surface of the sleeve (363).

9. The powder screening machine for dry-type transformer casting material according to claim 8, characterized in that: A bent sheet (367) is fixedly mounted on the inner wall of the sleeve (363), a retractable belt (362) is fixedly mounted between opposite surfaces of the bent sheet (367), locking balls (368) are fixedly mounted on both sides of the outer surface of the bent sheet (367), and a rubber rod (366) is fixedly mounted on the surface of the bent sheet (367) away from the locking ball (368).

10. The powder screening machine for dry-type transformer casting material according to claim 9, characterized in that: A shift plate (365) is fixedly mounted on the outer surface of the rubber rod (366); the shift plate (365) is clamped inside the hemispherical casing (364), and the shift plate (365) is pressed and adapted with the pressing pad (356).

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