Lightning arrester metal powder screening device

Abstract

The application discloses a lightning arrester metal powder screening device, and particularly relates to the technical field of powder screening, which comprises a base, a driving shaft arranged in the base, a screening assembly arranged on the base, a grinding assembly arranged in the screening assembly, and a supporting assembly arranged between the base and the screening assembly. The supporting assembly is arranged to move the screening assembly downward when too much metal powder is poured, so that the eccentric block and the screening assembly are offset, the eccentricity is increased, the swing range is increased, and the metal powder is more effectively screened. When the metal powder on the screen is reduced, the compressed third elastic member pushes the connecting ring to return to the original position, the eccentric block and the screening assembly are moved synchronously, the eccentricity is reduced, and the swing range is restored. The weight of the metal powder is used to adjust the movement of the eccentric block to increase or reduce the eccentricity, so that the metal powder is more effectively screened, and the working efficiency during screening is improved.

Description

Technical Field

[0001] This invention relates to the field of powder screening technology, and more specifically, to a lightning arrester metal powder screening device. Background Technology

[0002] A gyratory screen is a low-frequency vibrating device designed to mimic the principle of manual sieving. Its instantaneous motion trajectory is a combination of radial displacement and circular motion (spiral motion). The screen box is periodically shaken by an adjustable eccentric vibrator, which forces the material to make directional jumping motion on the screen surface, thereby completing the grading or impurity removal.

[0003] Chinese patent application CN202311086171.6 discloses a circular gyratory screen, which solves the problem that when a circular gyratory screen is in operation, the material directly enters from the feed inlet onto the screen surface, resulting in a distribution across the screen surface. This leads to a short residence time for material near the screen edge, causing it to flow directly out of the screening outlet, resulting in unsatisfactory screening effects and requiring repeated screening, thus reducing screening efficiency. The invention includes a base with a support at its top, a top cover above the support, a feed inlet in the middle of the top cover, and a screening module between the top cover and the support. The screening module includes a top screen, a middle screen, and a lower screen. This invention, by adding a guide ring and a material receiving tray inside the circular gyratory screen, increases the screening time of the material on the screen and allows for multiple screenings, effectively improving the screening effect and efficiency.

[0004] While adding guide rings and a material tray inside the circular gyratory screen can increase the screening time and perform multiple screenings, effectively improving screening effect and efficiency, there are still some drawbacks. When screening metal powder, the initial metal powder is poured into the upper layer and screened by vibration. The coarser metal powder will be discharged from the first channel, but fine metal powder will be mixed in. Usually, multiple screenings are required to separate them, and the coarser metal powder needs to be re-ground and screened again, which is very time-consuming and reduces work efficiency. When metal powder is poured in multiple times, the initial gyratory amplitude of the screen will decrease due to the weight of the excess metal powder, causing too much metal powder to accumulate in the center of the screen and become impossible to screen.

[0005] This invention provides a surge arrester metal powder screening device, which aims to solve the problem that when screening metal powder, the initial swing amplitude of the swaying screen decreases due to the excessive weight of the metal powder when multiple metal powders are poured in, causing too much metal powder to accumulate in the center of the screen and making it impossible to screen. Summary of the Invention

[0006] The purpose of this invention is to provide a surge arrester metal powder screening device to solve the problem mentioned in the background art that when screening metal powder, the initial swing amplitude of the swaying screen decreases due to the excessive weight of the metal powder when multiple metal powders are poured in, causing excessive metal powder to accumulate in the center of the screen and making it impossible to screen.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a surge arrester metal powder screening device, comprising a driving unit and a screening assembly, wherein the driving unit comprises a base and a driving shaft, and the screening assembly comprises an upper screening frame, a middle screening frame and a lower screening frame; The screening component includes a grinding component, which is used to grind large metal powder particles during metal powder screening. A support component is provided between the base and the screening component, and the support component can dynamically adjust the eccentricity of the screen body according to the material load. The support assembly includes a support plate fixedly connected to the top of the drive shaft. A counterweight is fixedly connected to one end of the support plate. A guide block is fixedly connected to the upper side of the support plate near the counterweight. A second pressing chamber is formed inside the guide block. A first communicating hole communicating with the second pressing chamber is formed at the top of the guide block. A sliding plate is slidably connected to the second pressing chamber. A second pressing column is fixedly connected to the top of the sliding plate and slidably connected with the first communicating hole.

[0008] Preferably, the support plate has a third sliding chamber, and a plurality of second connecting holes are provided between the second pressing chamber and the third sliding chamber. A second sliding groove is provided at the end of the support plate away from the counterweight. A plurality of third connecting holes are provided between the third sliding chamber and the second sliding groove. An eccentric block is slidably connected in the second sliding groove. A third piston plate is slidably connected inside the third sliding chamber. A guide rod that is fixedly connected to the third piston plate and the eccentric block is slidably connected inside each of the third connecting holes. Both the second pressing chamber and the third sliding chamber are filled with hydraulic oil. A second elastic element that is connected to the inner wall of the third piston plate and the third sliding chamber is sleeved on the outer wall of each guide rod.

[0009] Preferably, a screen is fixedly connected inside the upper and middle screening frames, and a discharge port is provided on the outer wall of the upper, middle and lower screening frames. A connecting ring is provided at the center of the bottom of the lower screening frame, and a first connecting port is opened at the bottom of the lower screening frame. Each screen is divided into upper and lower layers and is fixedly connected by a connecting plate. The connecting plate is inclined, and a second connecting port is opened on the screen corresponding to the position of the first connecting port.

[0010] Preferably, a fixing post is fixedly connected to the upper end of the eccentric block, the fixing post is slidably connected inside the connecting ring, and a third elastic element sleeved on the outer wall of the fixing post is connected between the eccentric block and the connecting ring.

[0011] Preferably, the grinding assembly includes a connecting column fixedly connected to the top of the support plate, the connecting column being positioned opposite to the drive shaft, and both the upper and middle screening frames having a blocking block fixedly connected to the outer wall of the connecting column. Each blocking block is positioned above the corresponding screen, and each blocking block has a first connecting block and a second connecting block fixedly connected to its outer wall, arranged along the same axis. Each first connecting block has a first sliding chamber inside, and each second connecting block has a second sliding chamber inside.

[0012] Preferably, a grinding ring is provided above each of the screens, and a grinding edge is provided on the inner bottom side of each grinding ring, which is adapted to the inclination angle of the corresponding connecting plate. A first guide post and a second guide post arranged on the same axis are fixedly connected to the inner side of each grinding ring. A first piston plate and a second piston plate are fixedly connected to the end of each first guide post and the second guide post away from the grinding ring. The first piston plate slides in a sealed manner in the first sliding chamber, and the second piston plate slides in a sealed manner in the second sliding chamber.

[0013] Preferably, the outer wall of the connecting column is fitted with a first clearance ring that is fixedly connected to the first connection port on the lower screening frame, the other end of the first clearance ring is fixedly connected to the second connection port on the screen in the middle screening frame, and the second connection port on the screen in the upper screening frame is fixedly connected with a second clearance ring, which is disposed between the two blocking blocks.

[0014] Preferably, each of the blocking blocks has a first pressing chamber, each of the first pressing chambers has a connecting hole with the first sliding chamber, and each of the first pressing chambers and the first sliding chamber is filled with hydraulic oil.

[0015] Preferably, a pressing groove is provided in the connecting column, and a first pressing column is slidably connected in the pressing groove. Two pressing plates are fixedly connected to the outer wall of the first pressing column. Each pressing plate is sealed and slidably connected in the corresponding first pressing chamber. A pressing block is fixedly connected to the end of the first pressing column away from the connecting column. A first elastic element sleeved on the outer wall of the first pressing column is connected between the pressing block and the blocking block.

[0016] Preferably, a ramp plate is fixedly connected above the screen in both the upper and middle screening frames. The other end of each ramp plate is connected to the corresponding discharge port. Each ramp plate has mesh holes, and the mesh holes on each ramp plate are the same size as the mesh holes of the corresponding screen.

[0017] The technical effects and advantages of this invention are as follows: 1. By setting up the grinding components, when large metal powder particles pass through the connecting plate, they are crushed into smaller metal powder particles by the contact and compression between the grinding edge and the connecting plate. The crushed metal powder falls from the outer mesh of the screen into the lower layer. Through the grinding of the grinding edge and the connecting plate, the utilization rate of metal powder is improved. During the grinding process, some large metal powder particles are not ground, so they are discharged from the discharge port through the inclined plate. The finest metal powder falls from the middle screening frame into the lower screening frame and is finally discharged from the discharge port of the lower screening frame, thereby improving the utilization rate of metal powder and the working efficiency of screening. 2. By setting up the support components, on the one hand, when too much metal powder is poured in, the entire screening component moves downward, simultaneously causing the second pressing column to move the sliding plate and the hydraulic oil to push the third piston plate, thereby causing the eccentric block to deflect the screening component, increasing the eccentricity and the swing amplitude, thus more effectively screening the metal powder. On the other hand, when the amount of metal powder on the screen decreases, the compressed third elastic element pushes the connecting ring back to its original position, simultaneously causing the eccentric block to move the screening component, decreasing the eccentricity and restoring the previous swing amplitude. The movement of the eccentric block is adjusted by the weight of the metal powder to increase or decrease the eccentricity, thereby making the metal powder more effectively screened and improving the working efficiency during screening. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall internal structure of the present invention; Figure 3 This is a schematic diagram of the screening component structure of the present invention; Figure 4 This is a schematic diagram of the screen and grinding ring structure of the present invention; Figure 5 This is a cross-sectional view of the screen and grinding ring structure of the present invention; Figure 6 This is a cross-sectional view of the grinding assembly structure of the present invention; Figure 7 This is a cross-sectional view of the first pressing column and blocking block structure of the present invention; Figure 8 This is a schematic diagram of the bottom structure of the filter box in this invention; Figure 9 This is a schematic diagram of the exploded structure of the support component of the present invention; Figure 10 For the present invention Figure 2 A schematic diagram of part A.

[0019] The attached figures are labeled as follows: 1. Drive unit; 11. Base; 12. Drive shaft; 3. Screening assembly; 31. Upper screening frame; 32. Middle screening frame; 33. Lower screening frame; 34. Screen; 35. Discharge port; 36. Connecting ring; 37. First connecting port; 38. Connecting plate; 39. Second connecting port; 4. Grinding assembly; 41. Connecting column; 42. Blocking block; 43. First connecting block; 44. Second connecting block; 45. First sliding chamber; 46. Second sliding chamber; 47. Grinding ring; 48. Grinding edge; 49. First guide column; 410. Second guide column; 411. First piston plate; 412. Second piston plate; 413. First clearance ring; 414. Second clearance ring. 415. First pressing chamber; 416. Connecting hole; 417. Pressing groove; 418. First pressing column; 419. Pressing plate; 420. Pressing block; 421. First elastic element; 422. Climbing plate; 5. Support assembly; 51. Support plate; 52. Counterweight block; 53. Guide block; 54. Second pressing chamber; 55. First connecting hole; 56. Sliding plate; 57. Second pressing column; 58. Third sliding chamber; 59. Second connecting hole; 510. Second sliding groove; 511. Third connecting hole; 512. Eccentric block; 513. Guide rod; 514. Third piston plate; 515. Second elastic element; 516. Fixed column; 517. Third elastic element. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 When screening metal powder, the initial metal powder is poured into the upper layer and screened by vibration. The coarser metal powder will be discharged from the first channel, but it will be mixed with fine metal powder. Usually, it needs to be screened multiple times to separate them. The coarser metal powder needs to be re-ground and screened again, which is very time-consuming and reduces work efficiency.

[0022] refer to Figure 1 and Figure 2An embodiment of the present invention provides a surge arrester metal powder screening device, which includes a drive unit 1 and a screening component 3. The drive unit 1 includes a base 11 and a drive shaft 12, and the screening component 3 includes an upper screening frame 31, a middle screening frame 32 and a lower screening frame 33. The screening component 3 is equipped with a grinding component 4, which is used to grind large metal powder particles in the metal powder screening process.

[0023] refer to Figure 1 and Figure 8 Each of the upper screening frame 31 and the middle screening frame 32 is fixedly connected with a screen 34. The mesh size of the screen 34 in the upper screening frame 31 is larger than that in the middle screening frame 32. The outer walls of the upper screening frame 31, the middle screening frame 32 and the lower screening frame 33 are all provided with discharge ports 35. A connecting ring 36 is provided at the center of the bottom of the lower screening frame 33. A first connecting port 37 is opened at the bottom of the lower screening frame 33. Each screen 34 is divided into upper and lower layers and is fixedly connected by a connecting plate 38. The connecting plate 38 is inclined. The connecting plate 38 has no screen holes to facilitate the grinding of large metal powder particles with the grinding component 4. The connecting plate 38 is made of wear-resistant steel. A second connecting port 39 is opened on the screen 34 corresponding to the position of the first connecting port 37.

[0024] refer to Figure 5 and Figure 6 The grinding assembly 4 includes a connecting column 41 fixedly connected to the top of the support plate 51. The connecting column 41 is positioned corresponding to the drive shaft 12. The upper screening frame 31 and the middle screening frame 32 are both provided with blocking blocks 42 fixedly connected to the outer wall of the connecting column 41. Each blocking block 42 is positioned above the corresponding screen 34. The outer wall of each blocking block 42 is fixedly connected with a first connecting block 43 and a second connecting block 44 arranged on the same axis. Each first connecting block 43 has a first sliding chamber 45 inside, and each second connecting block 44 has a second sliding chamber 46 inside.

[0025] refer to Figures 3 to 5 Each screen 34 is provided with a grinding ring 47 above it. The bottom inner side of each grinding ring 47 is provided with a grinding edge 48 that matches the inclination angle of the corresponding connecting plate 38. The inner side of each grinding ring 47 is fixedly connected with a first guide post 49 and a second guide post 410 arranged on the same axis. The end of each first guide post 49 and second guide post 410 away from the grinding ring 47 is fixedly connected with a first piston plate 411 and a second piston plate 412. The first piston plate 411 is sealed and slides in the first sliding chamber 45, and the second piston plate 412 is sealed and slides in the second sliding chamber 46.

[0026] When the screening component 3 is not working, there is a gap between the grinding edge 48 and the connecting plate 38. When the screening component 3 swings, the grinding edge 48 and the connecting plate 38 begin to contact one side, so that the large metal powder particles passing through will be squeezed and ground when passing through the connecting plate 38.

[0027] By setting an inclined connecting plate 38 in the central area of ​​the screen 34, a wedge-shaped extrusion space is formed with the conical grinding edge 48 of the rotating grinding ring 47. When large metal powder particles pass through the connecting plate 38, the grinding edge 48 will contact and extrude with the connecting plate 38, causing the large metal powder particles to decompose into small metal powder particles, which then fall from the outer screen 34 into the lower layer.

[0028] refer to Figure 6 The outer wall of the connecting column 41 is fitted with a first clearance ring 413 that is fixedly connected to the first connection port 37 on the lower screening frame 33. The other end of the first clearance ring 413 is fixedly connected to the second connection port 39 on the screen 34 in the middle screening frame 32. The second clearance ring 414 is fixedly connected to the second connection port 39 on the screen 34 in the upper screening frame 31. The second clearance ring 414 is disposed between the two blocking blocks 42.

[0029] By setting the first avoidance ring 413 and the second avoidance ring 414, interference of the screen 34 with the connecting column 41 is prevented when the screening component 3 swings. The space inside the first avoidance ring 413 and the second avoidance ring 414 is greater than the eccentricity of the screening component 3 when it swings.

[0030] refer to Figure 3 An inclined plate 422 is fixedly connected above the screen 34 in the upper screening frame 31 and the middle screening frame 32. The other end of each inclined plate 422 is connected to the corresponding discharge port 35. Each inclined plate 422 has a mesh opening, and the mesh opening on each inclined plate 422 is the same size as the mesh opening of the corresponding screen 34.

[0031] It should be noted that by setting up the ramp plate 422, when large metal powder particles pass through the connecting plate 38, they are not squeezed by the grinding edge 48. At this time, they will be fed into the ramp plate 422 through the outer layer of the screen 34 according to the swing path of the screening component 3. The front half of the ramp plate 422 is set at an inclination. The mesh size on the ramp plate 422 is the same as the mesh size of the corresponding screen 34. Excess small metal powder particles will fall through the mesh on the ramp plate 422 when climbing, so that only the large metal powder particles are discharged from the discharge port 35.

[0032] In actual use, starting the motor causes the screening component 3 to swing. The initial metal powder enters the screen 34 inside the upper screening frame 31 through the feed inlet. Because the drive shaft 12 is fixedly connected to the connecting column 41, the connecting column 41 will drive the grinding ring 47 to rotate. During the swinging motion, the connecting plate 38 on the screen 34 will contact the grinding edge 48 on the grinding ring 47. Then, through the swinging motion of the screening component 3, the metal powder will generate centrifugal force. Larger metal powder particles, due to their greater mass, are more easily thrown to the edge, while smaller metal powder particles fall into the lower layer through the screen 34. When the large metal powder particles pass through the connecting plate 38, they are squeezed by the grinding edge 48 and the connecting plate 38, causing the large metal powder particles to decompose into smaller metal powder particles. The decomposed metal powder falls into the lower layer through the mesh of the outer layer of the screen 34. Through the grinding of the grinding edge 48 and the connecting plate 38, the utilization rate of the metal powder is improved. When component 3 swings, some large metal powder particles will not be squeezed and ground by the grinding edge 48 when passing through the connecting plate 38. This will cause the large metal powder particles to fall into the outer layer of the screen 34. Through swinging, the large metal powder particles move along the edge of the upper screening frame 31. When they reach the discharge port 35, the large metal powder particles enter the climbing plate 422 according to the inertia of the swinging of the screening component 3. The front half of the climbing plate 422 is inclined. The mesh size of the climbing plate 422 is the same as that of the corresponding screen 34. The excess small metal powder particles will fall from the mesh size of the climbing plate 422 when climbing. Thus, only the large metal powder particles are discharged from the discharge port 35. The structure of the middle screening frame 32 is the same as that of the upper screening frame 31, and its movement principle is the same as described above. The finest metal powder falls from the middle screening frame 32 into the lower screening frame 33 and is finally discharged from the discharge port 35 on the lower screening frame 33.

[0033] In summary, by configuring the grinding component 4, when large metal powder particles pass through the connecting plate 38, they are crushed into smaller particles by the contact and compression between the grinding edge 48 and the connecting plate 38. The crushed metal powder falls from the outer mesh of the screen 34 into the lower layer. Through the grinding of the grinding edge 48 and the connecting plate 38, the utilization rate of the metal powder is improved. During the grinding process, some large metal powder particles are not ground, and are discharged from the discharge port 35 through the ramp plate 422. The finest metal powder falls from the middle screening frame 32 into the lower screening frame 33 and is finally discharged from the discharge port 35 of the lower screening frame 33. This improves the utilization rate of the metal powder and the working efficiency during screening.

[0034] Example 2 When metal powder is poured into the feed inlet multiple times, the swing amplitude of the gyratory screen will decrease due to the weight of the excessive metal powder, causing too much metal powder to accumulate in the center of the screen and making it impossible to screen, thus reducing the screening efficiency.

[0035] refer to Figure 2 and Figure 9 The support assembly 5 includes a support plate 51 fixedly connected to the top of the drive shaft 12. A counterweight 52 is fixedly connected to one end of the support plate 51. A guide block 53 is fixedly connected to the upper side of the support plate 51 near the counterweight 52. A second pressing chamber 54 is opened in the guide block 53. A first connecting hole 55 communicating with the second pressing chamber 54 is opened at the top of the guide block 53. A sliding plate 56 is slidably connected to the second pressing chamber 54. A second pressing column 57 slidably connected to the top of the sliding plate 56 is fixedly connected to the first connecting hole 55.

[0036] A support component 5 is provided between the base 11 and the screening component 3. The support component 5 can dynamically adjust the eccentricity of the screen body according to the material load.

[0037] refer to Figure 9 The support plate 51 has a third sliding chamber 58. A plurality of second connecting holes 59 are provided between the second pressing chamber 54 and the third sliding chamber 58. A second sliding groove 510 is provided at the end of the support plate 51 away from the counterweight 52. A plurality of third connecting holes 511 are provided between the third sliding chamber 58 and the second sliding groove 510. An eccentric block 512 is slidably connected in the second sliding groove 510. A third piston plate 514 is slidably connected inside the third sliding chamber 58. A guide rod 513 is slidably connected inside each third connecting hole 511 and is fixedly connected to the third piston plate 514 and the eccentric block 512. The second pressing chamber 54 and the third sliding chamber 58 are filled with hydraulic oil. A second elastic element 515 is sleeved on the outer wall of each guide rod 513 and is connected to the inner wall of the third piston plate 514 and the third sliding chamber 58.

[0038] As the weight of the metal powder increases, the screening assembly 3 is pressed down as a whole, pushing the second pressing column 57 to press down the sliding plate 56, so that the hydraulic oil enters the third sliding chamber 58 through the second connecting hole 59. The hydraulic oil pushes the third piston plate 514 to move, causing the eccentric block 512 to slide outward, increasing the eccentricity and thus increasing the swing amplitude.

[0039] refer to Figure 1 and Figure 8 Each of the upper screening frame 31 and the middle screening frame 32 is fixedly connected with a screen 34. The outer walls of the upper screening frame 31, the middle screening frame 32 and the lower screening frame 33 are provided with discharge ports 35. A connecting ring 36 is provided at the center of the bottom of the lower screening frame 33. A first connecting port 37 is opened at the bottom of the lower screening frame 33. Each screen 34 is divided into upper and lower layers and is fixedly connected by a connecting plate 38. The connecting plate 38 is inclined. A second connecting port 39 is opened on the screen 34 corresponding to the position of the first connecting port 37.

[0040] refer to Figure 10 The upper end of the eccentric block 512 is fixedly connected to a fixing post 516, which is slidably connected inside the connecting ring 36. A third elastic element 517 sleeved on the outer wall of the fixing post 516 is connected between the eccentric block 512 and the connecting ring 36.

[0041] When the metal powder decreases, the third elastic element 517 pushes the connecting ring 36 upward, causing the hydraulic oil to flow back. The second elastic element 515 pushes the third piston plate 514 to reset, and the eccentric block 512 moves inward, reducing the eccentricity and restoring the initial amplitude.

[0042] In actual use, when metal powder is poured in multiple times from the inlet, the metal powder will accumulate on the screen 34 inside the upper screening frame 31. This will cause the connecting ring 36 on the lower screening frame 33 to compress the third elastic element 517 under the action of gravity, causing the entire screening assembly 3 to move downwards. At the same time, when the lower screening frame 33 moves downwards, its bottom will contact the second pressing column 57. The overall weight will cause the second pressing column 57 to drive the sliding plate 56 to move downwards in the second pressing chamber 54. This will squeeze the hydraulic oil in the second pressing chamber 54 through the second connecting hole 59 into the third sliding chamber 58, and simultaneously push the third piston plate 514 to move away from the counterweight 52. At the same time, the third piston plate 514 will compress the second elastic element 515. When the third piston plate 514 moves, it will cause the guide rod 5... 13. The eccentric block 512 is pushed to slide in the second sliding groove 510, so that the screening component 3 moves with the eccentric block 512, increasing the swing amplitude of the screening component 3, and screening the metal powder gathered at the center of the screen 34. After the metal powder is screened out, the weight of the screening component 3 decreases, so that the compressed third elastic element 517 pushes the connecting ring 36 back to its original position. At the same time, the bottom of the lower screening frame 33 no longer contacts the second pressing column 57, so that the compressed second elastic element 515 pushes the third piston plate 514 to move, allowing hydraulic oil to enter the second pressing chamber 54 from the second connecting hole 59. At the same time, the movement of the third piston plate 514 will cause the screening component 3 on the eccentric block 512 to shift as a whole, reducing the eccentricity and restoring the previous swing amplitude.

[0043] In summary, by setting up the support component 5, on the one hand, when too much metal powder is poured in, the entire screening component 3 moves downward, simultaneously causing the second pressing column 57 to move the sliding plate 56 and the hydraulic oil to push the third piston plate 514 to move, thereby causing the eccentric block 512 to deflect the screening component 3, increasing the eccentricity and the swing amplitude, thus more effectively screening the metal powder. On the other hand, when the metal powder on the screen 34 decreases, the compressed third elastic element 517 pushes the connecting ring 36 to return to its original position, simultaneously causing the eccentric block 512 to move the screening component 3, decreasing the eccentricity and restoring the previous swing amplitude. The movement of the eccentric block 512 is adjusted by the weight of the metal powder to increase or decrease the eccentricity, thereby making the metal powder more effectively screened and improving the working efficiency during screening.

[0044] Example 3 When the screening component in the above embodiment 2 is shifted as a whole, the grinding ring in the grinding component will interfere with the screen and cannot swing. Therefore, this embodiment improves the device described in the above embodiment.

[0045] refer to Figures 3 to 6 The grinding assembly 4 includes a connecting column 41 fixedly connected to the top of the support plate 51. The connecting column 41 is positioned corresponding to the drive shaft 12. The upper screening frame 31 and the middle screening frame 32 are both provided with blocking blocks 42 fixedly connected to the outer wall of the connecting column 41. Each blocking block 42 is positioned above the corresponding screen 34. The outer wall of each blocking block 42 is fixedly connected with a first connecting block 43 and a second connecting block 44 arranged on the same axis. Each first connecting block 43 has a first sliding chamber 45 inside, and each second connecting block 44 has a second sliding chamber 46 inside.

[0046] refer to Figure 5 and Figure 6 Each screen 34 is provided with a grinding ring 47 above it. The bottom inner side of each grinding ring 47 is provided with a grinding edge 48 that matches the inclination angle of the corresponding connecting plate 38. The inner side of each grinding ring 47 is fixedly connected with a first guide post 49 and a second guide post 410 arranged on the same axis. The end of each first guide post 49 and second guide post 410 away from the grinding ring 47 is fixedly connected with a first piston plate 411 and a second piston plate 412. The first piston plate 411 is sealed and slides in the first sliding chamber 45, and the second piston plate 412 is sealed and slides in the second sliding chamber 46.

[0047] refer to Figure 6 and Figure 7The outer wall of the connecting column 41 is fitted with a first clearance ring 413 that is fixedly connected to the first connection port 37 on the lower screening frame 33. The other end of the first clearance ring 413 is fixedly connected to the second connection port 39 on the screen 34 in the middle screening frame 32. The second connection port 39 on the screen 34 in the upper screening frame 31 is fixedly connected to a second clearance ring 414. The second clearance ring 414 is disposed between two blocking blocks 42. Each blocking block 42 is provided with a first pressing chamber 415. Each first pressing chamber 415 is provided with a connection hole 416 between it and the first sliding chamber 45. Each first pressing chamber 415 and the first sliding chamber 45 are filled with hydraulic oil.

[0048] refer to Figure 6 and Figure 7 A pressing groove 417 is provided in the connecting column 41, and a first pressing column 418 is slidably connected in the pressing groove 417. Two pressing plates 419 are fixedly connected to the outer wall of the first pressing column 418. Each pressing plate 419 is sealed and slidably connected in the corresponding first pressing chamber 415. A pressing block 420 is fixedly connected to the end of the first pressing column 418 away from the connecting column 41. A first elastic element 421 sleeved on the outer wall of the first pressing column 418 is connected between the pressing block 420 and the blocking block 42.

[0049] The grinding ring 47 is connected to the first sliding chamber 45 through the first guide post 49. When the load of the screening component 3 increases and moves downward, the pressing block 420 is triggered to drive the hydraulic oil to make the grinding ring 47 shift synchronously, ensuring that the extrusion gap is constant and avoiding grinding failure caused by structural deformation.

[0050] In actual use, when the screening component 3 moves down as a whole, the top cover on the upper screening frame 31 will contact the pressing block 420, causing the pressing block 420 to push the first pressing column 418 downward and compress the first elastic element 421. When the first pressing column 418 moves down, the pressing plate 419 will move down simultaneously and squeeze the hydraulic oil in the first pressing chamber 415, so that the hydraulic oil enters the first sliding chamber 45 through the connecting hole 416 and pushes the first piston plate 411 to drive the grinding ring 47 to shift as a whole. When the screening component 3 moves up, the top cover on the upper screening frame 31 will gradually leave the pressing block 420, allowing the compressed first elastic element 421 to push the pressing block 420 upward, so that the hydraulic oil in the first sliding chamber 45 returns to the first pressing chamber 415, and the grinding ring 47 returns to its original state.

[0051] In summary, with the arrangement of the first pressing column 418 and the pressing plate 419, when the entire screening assembly 3 moves downward, the inside of the top cover on the upper screening frame 31 will contact the pressing block 420, causing the pressing block 420 to push the first pressing column 418 downward and compress the first elastic element 421. Simultaneously, the pressing plate 419 moves downward and squeezes the hydraulic oil in the first pressing chamber 415, allowing the hydraulic oil to enter the first sliding chamber 45 through the connecting hole 416 and push the first piston plate 411 to drive the grinding ring 47. When the screening component 3 moves upward, the top cover on the upper screening frame 31 gradually moves away from the pressing block 420, causing the compressed first elastic element 421 to push the pressing block 420 upward. This causes the hydraulic oil in the first sliding chamber 45 to return to the first pressing chamber 415, and the grinding ring 47 to return to its original shape. When the screening component 3 moves as a whole, the grinding ring 47 will also move, thus preventing the grinding ring 47 from interfering with the screen 34 and improving the safety and efficiency of the screening device during use.

[0052] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A surge arrester metal powder screening device, comprising a driving unit and a screening assembly, wherein the driving unit comprises a base and a driving shaft, and the screening assembly comprises an upper screening frame, a middle screening frame and a lower screening frame, characterized in that; The screening component includes a grinding component, which is used to grind large metal powder particles during metal powder screening. A support component is provided between the base and the screening component, and the support component can dynamically adjust the eccentricity of the screen body according to the material load. The support assembly includes a support plate fixedly connected to the top of the drive shaft, a counterweight fixedly connected to one end of the support plate, a guide block fixedly connected to the upper side of the support plate near the counterweight, a second pressing chamber opened in the guide block, a first communicating hole opened at the top of the guide block communicating with the second pressing chamber, a sliding plate slidably connected to the second pressing chamber, and a second pressing column slidably connected to the top of the sliding plate communicating with the first communicating hole. The support plate has a third sliding chamber, and a plurality of second connecting holes are provided between the second pressing chamber and the third sliding chamber. A second sliding groove is provided at the end of the support plate away from the counterweight. A plurality of third connecting holes are provided between the third sliding chamber and the second sliding groove. An eccentric block is slidably connected in the second sliding groove. The upper and middle screening frames are each fixedly connected with a screen, and the bottom center of the lower screening frame is provided with a connecting ring. Each screen is divided into upper and lower layers and is fixedly connected by a connecting plate, which is inclined. The upper end of the eccentric block is fixedly connected to a fixed column, the fixed column is slidably connected inside the connecting ring, and a third elastic element sleeved on the outer wall of the fixed column is connected between the eccentric block and the connecting ring. The grinding assembly includes a connecting column fixedly connected to the top of the support plate. The connecting column is positioned opposite to the drive shaft. Both the upper and middle screening frames are provided with blocking blocks fixedly connected to the outer wall of the connecting column. Each blocking block is positioned above the corresponding screen. Each blocking block has a first connecting block and a second connecting block fixedly connected to its outer wall, arranged on the same axis. Each first connecting block has a first sliding chamber inside, and each second connecting block has a second sliding chamber inside. Each of the screens is provided with a grinding ring above it. The bottom inner side of each grinding ring is provided with a grinding edge that matches the tilt angle of the corresponding connecting plate. The inner side of each grinding ring is fixedly connected with a first guide post and a second guide post arranged on the same axis.

2. The surge arrester metal powder screening device according to claim 1, characterized in that: The third sliding chamber is internally sealed and slidably connected to a third piston plate. Each of the third connecting holes is internally slidably connected to a guide rod that is fixedly connected to the third piston plate and the eccentric block. Both the second pressing chamber and the third sliding chamber are filled with hydraulic oil. The outer wall of each guide rod is fitted with a second elastic element that is connected to the inner wall of the third piston plate and the third sliding chamber.

3. The surge arrester metal powder screening device according to claim 1, characterized in that: The outer walls of the upper, middle, and lower screening frames are all provided with discharge ports. The bottom of the lower screening frame is provided with a first connection port, and the screen is provided with a second connection port corresponding to the position of the first connection port.

4. The surge arrester metal powder screening device according to claim 3, characterized in that: Each of the first guide post and the second guide post has a first piston plate and a second piston plate fixedly connected to the end away from the grinding ring. The first piston plate slides in a sealed manner within the first sliding chamber, and the second piston plate slides in a sealed manner within the second sliding chamber.

5. The surge arrester metal powder screening device according to claim 4, characterized in that: The outer wall of the connecting column is fitted with a first clearance ring that is fixedly connected to the first connection port on the lower screening frame. The other end of the first clearance ring is fixedly connected to the second connection port on the screen in the middle screening frame. The second connection port on the screen in the upper screening frame is fixedly connected with a second clearance ring, which is disposed between the two blocking blocks.

6. The surge arrester metal powder screening device according to claim 5, characterized in that: Each of the blocking blocks has a first pressing chamber, and each first pressing chamber has a connecting hole with the first sliding chamber. Both the first pressing chamber and the first sliding chamber are filled with hydraulic oil.

7. The surge arrester metal powder screening device according to claim 6, characterized in that: The connecting column has a pressing groove, and a first pressing column is slidably connected in the pressing groove. Two pressing plates are fixedly connected to the outer wall of the first pressing column. Each pressing plate is sealed and slidably connected in the corresponding first pressing chamber. A pressing block is fixedly connected to the end of the first pressing column away from the connecting column. A first elastic element sleeved on the outer wall of the first pressing column is connected between the pressing block and the blocking block.

8. The surge arrester metal powder screening device according to claim 7, characterized in that: Both the upper and middle screening frames have a fixed climbing plate above the screen. The other end of each climbing plate is connected to the corresponding discharge port. Each climbing plate has a mesh opening, and the mesh opening on each climbing plate is the same size as the mesh opening of the corresponding screen.

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