A pressure screen

Abstract

The application relates to the mechanical technical field, in particular to a pressure screen, which at least comprises a screen cylinder shell, an upper cover, further comprises a lifting assembly arranged on the side of the screen cylinder shell and used for adjusting the lifting of the upper cover; the lifting assembly comprises a side-arranged base, a lifting assembly, a lifting arm assembly and a locking assembly; the side-arranged base is arranged on the right side of the screen cylinder shell; the lifting assembly comprises a rotating assembly and a longitudinal moving assembly; the lifting arm assembly comprises a lifting arm lower cylinder, a top cross arm and a lifting arm ring groove; the locking assembly comprises a locking cavity, a screw rod assembly, a nut assembly, an upper transmission member and a lower transmission member; the upper cover is lifted through the lifting assembly; the upper rotating handle side of the lifting assembly is arranged on the side and the height is located in the lower half of the base shell, so that a person can stand on the ground to operate; the locking assembly can also unlock the longitudinal moving freedom of the lifting arm assembly, so that the lifting arm assembly can be completely lifted out of the side-arranged base, and the lifting arm assembly can be maintained and repaired independently.

Description

Technical Field

[0001] This application relates to the field of mechanical technology, specifically to a pressure screen. Background Technology

[0002] A pressure screen is a device used for screening pulp. Its main components include at least a screen cylinder, a screen drum (containing screen holes or slots), and a rotor (containing blades). Its working principle is pressure-driven screening and filtration. Good pulp passes through the screen drum under pressure, while coarse residue is trapped on the screen drum surface and moves downwards to be discharged. When the rotor rotates, the gap between the front end of the rotor and the screen plate is very small, pressing the pulp outwards from the screen plate. As the gap between the rear part of the rotor and the screen plate gradually increases, a localized negative pressure appears at high speed, causing the pulp on the outside of the screen plate to backflow. Pulp clumps and coarse fibers adhering to the screen holes are periodically flushed away from the screen plate.

[0003] The connection between the screen cylinder and the top cover of existing pressure screens is relatively simple. The top cover is lifted by a screw device located on the upper side of the screen cylinder. For example, patent CN220665805U discloses a quick-opening device for pressure screens. However, the installation position of the screw device in this case inevitably has the following problems: the operating part of the screw is located at the top of the entire screen cylinder, requiring manual operation from a height, which is neither convenient nor safe. Summary of the Invention

[0004] A pressure screen includes at least a screen cylinder shell and a top cover, characterized in that: it further includes a lifting assembly disposed on the side of the screen cylinder shell for adjusting the lifting and lowering of the top cover; The takeoff and landing assembly includes: The side-mounted foundation is located on the right side of the screen cylinder shell and includes a foundation shell, an upper opening formed on the upper end of the foundation shell, an anti-rotation insertion hole formed on the side of the upper opening, a central insertion hole at the lower end of the upper opening, a bearing cavity formed in the middle of the central insertion hole, a transmission lower cavity at the lower end of the central insertion hole, and a perforated baffle formed inside the transmission lower cavity. The right side of the transmission lower cavity is provided with an upper side hole and a lower side hole at the upper and lower positions of the perforated baffle, respectively. The take-off and landing assembly, located within the side-mounted foundation, includes a rotating assembly and a longitudinal traversing assembly; The rotating assembly includes a rotatable upper torsion shaft disposed in the upper side hole, a first transverse bevel gear disposed on the left side of the upper torsion shaft, and a rotatable external threaded tube disposed in the middle insertion hole, a first longitudinal bevel gear disposed at the lower end of the external threaded tube and meshing with the first transverse bevel gear, and a rotating ring formed on the outer wall of the external threaded tube and disposed in the bearing cavity. The longitudinal movement assembly includes a translational circular shaft disposed in the upper opening, a translational lower ring formed at the lower end of the translational circular shaft, an anti-rotation plug formed on the side of the translational lower ring and inserted into the anti-rotation socket, and an internal threaded hole formed at the lower end of the translational circular shaft and screwed into the external threaded pipe. The boom assembly includes a lower boom cylinder that is slidably sleeved on the outer wall of the translational circular shaft and inserted into the upper opening, and a top cross arm formed on the left side of the lower boom cylinder.

[0005] As a further technical solution: The inner wall of the lower cylinder of the boom is also provided with a boom ring groove; The lifting assembly also includes a locking assembly for insertion into the boom annular groove.

[0006] As a further technical solution: The locking assembly includes: The locking chamber includes a locking longitudinal hole at the upper end of the internal threaded hole, a limiting protrusion ring formed in the middle of the inner wall of the longitudinal locking hole, a transverse through hole formed in the upper half of the translational round shaft and connected to the locking longitudinal hole, and an upper longitudinal rod at the middle of the upper end of the transverse through hole. A lead screw spindle is provided on the left and right sides of the lower end of the upper longitudinal rod, and each lead screw spindle is provided with a wide diameter end shaft at its stop end. The lead screw assembly includes two screws. The lead screw assembly includes an external threaded rod. The external threaded rod also has a lead screw central hole formed inside to accommodate the lead screw spindle and the wide-diameter end shaft. A transverse bevel gear is also formed inside the external threaded rod. The nut assembly includes an annular nut screwed onto the outer wall of the externally threaded rod, an axial slot provided on the outer wall of the annular nut, and an axial insert provided on the inner wall of the transverse through hole and engaged with the axial slot. The upper transmission component includes an upper transmission shaft that is rotatably disposed in the locking longitudinal hole, a limiting ring groove formed on the outer wall of the upper transmission shaft and accommodating a limiting protrusion, a longitudinal bevel gear formed on the upper end of the upper transmission shaft and meshing with two transverse bevel gears, and a transmission square hole formed on the lower end of the upper transmission shaft. The lower transmission component includes a transmission square shaft inserted into a transmission square hole and a lower transmission shaft formed below the transmission square shaft. The lower transmission shaft passes through an external threaded pipe and is provided with a perforated baffle. The lower end of the lower transmission shaft is also provided with a second longitudinal bevel gear. The lower transmission component also includes a lower torsion shaft provided in a lower side hole and a second transverse bevel gear formed on the left side of the lower torsion shaft and meshing with the second longitudinal bevel gear.

[0007] As a further technical solution: A thrust bearing is provided on the upper and lower end faces of the rotating ring.

[0008] As a further technical solution: The axial slots are provided in at least three, and the axial slots are distributed at equal intervals along the circumferential direction on the outer wall of the annular nut.

[0009] As a further technical solution: An upper rotating handle is also provided on the right side of the upper torsion shaft.

[0010] As a further technical solution: A lower rotating handle is also provided on the right side of the lower torsion shaft.

[0011] Beneficial effects: The pressure screen described in this case has an upper cover that is raised by a lifting assembly. The upper rotating handle of the lifting assembly is located on the side and its height is located in the lower half of the base shell, making it convenient for people to operate while standing on the ground.

[0012] The pressure screen described in this case includes a locking assembly used to lock the longitudinal movement freedom of the boom assembly, preventing the boom assembly from coming out of the upper opening; furthermore, the insertion and engagement of the transmission square shaft and the transmission square hole ensures that the torsional transmission between the upper and lower transmission components can still be guaranteed when the upper transmission component moves up and down with the longitudinal movement assembly.

[0013] The pressure screen described in this case also includes a locking assembly that can unlock the longitudinal movement freedom of the boom assembly, allowing the boom assembly to be completely lifted out of the side foundation, facilitating separate maintenance of the boom assembly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of one embodiment of the pressure screen.

[0015] Figure 2 This is a front view of one embodiment of the pressure screen.

[0016] Figure 3 This is a schematic diagram of the lifting assembly and the screen cylinder shell.

[0017] Figure 4 This is a cross-sectional view of the first embodiment of the takeoff and landing assembly.

[0018] Figure 5 This is a cross-sectional view of the second embodiment of the takeoff and landing assembly.

[0019] Figure 6 This is a cross-sectional view of one embodiment of the side-mounted foundation.

[0020] Figure 7 This is a cross-sectional view of the first state of the take-off and landing assembly.

[0021] Figure 8 This is a cross-sectional view of the second state of the take-off and landing assembly.

[0022] Figure 9 yes Figure 4 Enlarged schematic diagram of the first state in section A.

[0023] Figure 10 yes Figure 4 Enlarged schematic diagram of the second state in part A.

[0024] Figure 11 This is a schematic diagram of one embodiment of the lower transmission component.

[0025] In the picture: 1. Side-mounted foundation; 11. Foundation shell; 12. Top opening; 13. Anti-rotation insertion hole; 14. Center insertion hole; 15. Bearing cavity; 16. Lower transmission cavity; 17. Perforated baffle; 18. Top side hole; 19. Bottom side hole; 2. Lifting and lowering components; 21. Rotating assembly; 211. Upper torsion shaft; 212. First transverse bevel gear; 213. Upper rotating handle; 214. External threaded tube; 215. First longitudinal bevel gear; 216. Rotating ring; 217. Thrust bearing; 22. Longitudinal translation assembly; 221. Translation shaft; 222. Lower translation ring; 223. Anti-rotation plug; 224. Internal threaded hole; 3. Boom assembly; 31. Lower boom cylinder; 32. Top cross boom; 33. Boom annular groove; 4. Locking assembly; 41. Locking chamber; 411. Locking longitudinal hole; 412. Limiting protrusion ring; 413. Horizontal through hole; 414. Upper longitudinal rod; 415. Lead screw spindle; 416. Wide diameter end shaft. 42. Lead screw assembly; 421. External threaded rod; 422. Lead screw bore; 423. Horizontal bevel gear; 43. Nut assembly; 431. Ring nut; 432. Axial slot; 433. Axial insert; 44. Upper transmission component; 441. Upper transmission shaft; 442. Limiting ring groove; 443. Longitudinal bevel gear; 444. Transmission square hole; 45. Lower transmission component; 451. Transmission square shaft; 452. Lower transmission shaft; 453. Second longitudinal bevel gear; 454. Lower torsion shaft; 455. Second transverse bevel gear; 456. Lower rotary handle; 6. Electric motor; 7. Take-off and landing assembly; 8. Top cover; 9. Screen cylinder outer shell. Detailed Implementation

[0026] A pressure screen includes at least a screen cylinder housing 9 and a top cover 8, and also includes a lifting assembly 7 disposed on the side of the screen cylinder housing 9 for adjusting the lifting and lowering of the top cover 8; The lifting and lowering assembly 7 includes a side-mounted foundation 1, a lifting and lowering component 2, a boom assembly 3, and a locking assembly 4.

[0027] The side-mounted base 1 is located on the right side of the screen cylinder shell 9, and includes a base shell 11, an upper opening 12 formed on the upper end of the base shell 11, an anti-rotation insertion hole 13 formed on the side of the upper opening 12, a central insertion hole 14 located at the lower end of the upper opening 12, a bearing cavity 15 formed in the middle of the central insertion hole 14, a transmission lower cavity 16 located at the lower end of the central insertion hole 14, and a perforated baffle 17 formed inside the transmission lower cavity 16. The right side of the transmission lower cavity 16 is provided with an upper side hole 18 and a lower side hole 19 located above and below the perforated baffle 17, respectively. The lifting and lowering assembly 2 is disposed within the side base 1 and includes a rotating assembly 21 and a longitudinal moving assembly 22. The rotating assembly 21 includes an upper torsion shaft 211 rotatable within the upper side hole 18, a first transverse bevel gear 212 disposed on the left side of the upper torsion shaft 211, and also includes an externally threaded tube 214 rotatable within the central insertion hole 14, a first longitudinal bevel gear 215 disposed at the lower end of the externally threaded tube 214 and meshing with the first transverse bevel gear 212, and a rotating ring 216 formed on the outer wall of the externally threaded tube 214 and disposed within the bearing cavity 15. The longitudinal moving assembly 22 includes a translational shaft 221 disposed within the upper opening 12, a translational lower ring 222 formed at the lower end of the translational shaft 221, an anti-rotation plug 223 formed on the side of the translational lower ring 222 and inserted into the anti-rotation insertion hole 13, and an internally threaded hole 224 formed at the lower end of the translational shaft 221 and screwed onto the externally threaded tube 214. Furthermore, an upper rotating handle 213 is provided on the right side of the upper torsion shaft 211; and further still, a thrust bearing 217 is provided on the upper and lower end faces of the rotating ring 216 respectively.

[0028] The boom assembly 3 includes a lower boom cylinder 31 that is slidably sleeved on the outer wall of the translational circular shaft 221 and inserted into the upper opening 12, and a top horizontal arm 32 formed on the left side of the lower boom cylinder 31; the inner wall of the lower boom cylinder 31 is also provided with a boom annular groove 33. Furthermore, the stop end of the top horizontal arm 32 is detachably connected to the lifting lug 81 on the top of the upper cover 8; and even further, the stop end of the top horizontal arm 32 is detachably connected to the lifting lug 81 on the top of the upper cover 8 by bolts.

[0029] As a further implementation, the upper right corner of the top cross arm 32 is also provided with a lifting hole for easy attachment of a hook.

[0030] The locking assembly 4 includes a locking chamber 41, a lead screw assembly 42, a nut assembly 43, an upper transmission component 44, and a lower transmission component 45. The locking chamber 41 includes a locking longitudinal hole 411 located at the upper end of the internal threaded hole 224, a limiting protrusion 412 formed in the middle of the inner wall of the longitudinal locking hole 411, a transverse through hole 413 formed in the upper half of the translational shaft 221 and communicating with the locking longitudinal hole 411, and an upper longitudinal rod 414 located in the middle of the upper end of the transverse through hole 413. The lower end of the upper longitudinal rod 414 is located on the left... On the right side, there is a lead screw spindle 415, and each lead screw spindle 415 has a wide-diameter end shaft 416 at its stop end; there are two lead screw assemblies 42, each lead screw assembly 42 including an external threaded rod 421, and the external threaded rod 421 also has a lead screw central hole 422 formed therein to accommodate the lead screw spindle 415 and the wide-diameter end shaft 416, and a transverse bevel gear 423 is also formed on the inner side of the external threaded rod 421; the nut assembly 43 includes an annular nut 431 screwed to the outer wall of the external threaded rod 421, and a nut 431 provided on the annular nut 431. The axial slot 432 on the outer wall of the nut 431, and the axial insert 433 provided on the inner wall of the transverse through hole 413 and inserted into the axial slot 432; the upper transmission member 44 includes an upper transmission shaft 441 rotatably disposed in the locking longitudinal hole 411, a limiting ring groove 442 formed on the outer wall of the upper transmission shaft 441 and accommodating a limiting protrusion ring 412, a longitudinal bevel gear 443 formed on the upper end of the upper transmission shaft 441 and meshing with two transverse bevel gears 423, and a transmission square hole 43 formed on the lower end of the upper transmission shaft 441. 44; The lower transmission component 45 includes a transmission square shaft 451 inserted into the transmission square hole 444 and a lower transmission shaft 452 formed below the transmission square shaft 451. The lower transmission shaft 452 passes through the external threaded pipe 214 and the perforated baffle 17. The lower end of the lower transmission shaft 452 is also provided with a second longitudinal bevel gear 453. The lower transmission component 45 also includes a lower torsion shaft 454 provided in the lower side hole 19 and a second transverse bevel gear 455 formed on the left side of the lower torsion shaft 454 and meshing with the second longitudinal bevel gear 453.

[0031] Furthermore, at least three axial slots 432 are provided, and the axial slots 432 are evenly distributed along the circumferential direction on the outer wall of the annular nut 431.

[0032] Furthermore, a lower rotating handle 456 is also provided on the right side of the lower torsion shaft 454.

[0033] Based on the above technical solution, this case also discloses a method for lifting the upper cover 8 of a pressure screen, including the following steps: Step 1: Remove the bolts that secure the top cover 8 to the upper edge of the sieve cylinder shell 9; Step 2, rotate the boom assembly 3 and the upper cover 8: As per the instruction manual Figure 7 , 8 As shown: The upper rotating handle 213, upper torsion shaft 211, first transverse bevel gear 212, first longitudinal bevel gear 215, and external threaded pipe 214 are manually twisted; The external threaded tube 214 drives the translational circular shaft 221, the translational lower ring 222, and the anti-rotation plug 223 to move upward; The upward movement of the translational circular shaft 221 drives the boom assembly 3 to move upward, and the boom assembly 3 drives the upper cover 8 to rise. By pushing the boom assembly 3 and the upper cover 8 to rotate them within the upper opening 12, the upper cover 8 can be moved to the desired position.

[0034] This case also provides a method for the inspection and maintenance of the boom assembly 3, including the following steps: Step 3: Disconnect the connection between the stop end of the top cross arm 32 and the lug 81 on the top of the upper cover 8; Step 4: Release the locking assembly 4 pairs of boom annular grooves 33: Rotate the lower handle 456, the lower torsion shaft 454, and the second horizontal bevel gear 455. The second horizontal bevel gear 455 drives the second vertical bevel gear 453, the lower transmission shaft 452, and the transmission square shaft 451 to rotate. The transmission square shaft 451 drives the transmission square hole 444, the upper transmission shaft 441, and the longitudinal bevel gear 443 to rotate. The longitudinal bevel gear 443 drives the transverse bevel gear 423 and the external threaded rod 421 to rotate. The external threaded rod 421 drives the annular nut 431 to move axially until the annular nut 431 is dislodged from the boom annular groove 33, so that the boom assembly 3 is no longer locked by 43 to restrict its longitudinal movement freedom. Use hoisting equipment to lift the boom assembly 3, and then perform maintenance on the boom assembly 3. It is particularly important to note that the lower boom cylinder 31 generates significant friction and mechanical wear during lifting and rotation. Therefore, applying a lubricating layer to the outer and inner walls of the lower boom cylinder 31 after lifting the boom assembly 3 is a necessary maintenance procedure.

[0035] It should be noted that the pressure screen described in this case is a vertically mounted motor direct drive type, that is, the transmission shaft and rotor are directly driven to rotate by the vertically mounted motor 6, which has high transmission efficiency; furthermore, the motor 6 is a permanent magnet synchronous motor.

Claims

1. A pressure screen, comprising at least a screen cylinder shell (9) and a top cover (8), characterized in that: It also includes a lifting assembly (7) located on the side of the screen cylinder housing (9) for adjusting the lifting and lowering of the upper cover (8); The takeoff and landing assembly (7) includes: A side-mounted base (1) is set on the right side of the screen cylinder shell (9), including a base shell (11), an upper opening (12) formed on the upper end of the base shell (11), an anti-rotation insertion hole (13) formed on the side of the upper opening (12), a middle insertion hole (14) provided at the lower end of the upper opening (12), a bearing cavity (15) formed in the middle of the middle insertion hole (14), a transmission lower cavity (16) provided at the lower end of the middle insertion hole (14), and a perforated baffle (17) formed inside the transmission lower cavity (16). The right side of the transmission lower cavity (16) is provided with an upper side hole (18) and a lower side hole (19) above and below the perforated baffle (17), respectively. The lifting and lowering assembly (2) is installed in the side foundation (1) and includes a rotating assembly (21) and a longitudinal moving assembly (22); The longitudinal translation component (22) includes a translational circular shaft (221) disposed in the upper opening (12), a translational lower ring (222) formed at the lower end of the translational circular shaft (221), an anti-rotation plug (223) formed on the side of the translational lower ring (222) and inserted into the anti-rotation insertion hole (13), and an internal threaded hole (224) formed at the lower end of the translational circular shaft (221) and screwed into the external threaded tube (214); The boom assembly (3) includes a lower boom cylinder (31) that is slidably sleeved on the outer wall of the translational circular shaft (221) and inserted into the upper opening (12), and a top cross arm (32) formed on the left side of the lower boom cylinder (31). The inner wall of the lower cylinder (31) of the boom is also provided with a boom annular groove (33); The lifting assembly (7) also includes a locking assembly (4) for insertion into the boom annular groove (33); The locking assembly (4) includes: The locking chamber (41) includes a locking longitudinal hole (411) provided at the upper end of the internal threaded hole (224), a limiting protrusion ring (412) formed in the middle of the inner wall of the locking longitudinal hole (411), a transverse through hole (413) formed in the upper half of the translational round shaft (221) and connected to the locking longitudinal hole (411), and an upper longitudinal rod (414) provided in the middle of the upper end of the transverse through hole (413). The lower left and right sides of the upper longitudinal rod (414) are respectively provided with a lead screw spindle (415), and each lead screw spindle (415) is provided with a wide diameter end shaft (416) at the stop end. Two lead screw assemblies (42) are provided. The lead screw assembly (42) includes an external thread rod (421). The external thread rod (421) also has a lead screw central hole (422) formed inside, which accommodates the lead screw spindle (415) and the wide diameter end shaft (416). A transverse bevel gear (423) is also formed inside the external thread rod (421). The nut assembly (43) includes an annular nut (431) screwed onto the outer wall of the external threaded rod (421), an axial slot (432) provided on the outer wall of the annular nut (431), and an axial insert (433) provided on the inner wall of the transverse through hole (413) and engaged with the axial slot (432). The upper transmission component (44) includes an upper transmission shaft (441) rotatably disposed in the locking longitudinal hole (411), a limiting ring groove (442) formed on the outer wall of the upper transmission shaft (441) and accommodating a limiting protrusion ring (412), a longitudinal bevel gear (443) formed on the upper end of the upper transmission shaft (441) and meshing with two transverse bevel gears (423), and a transmission square hole (444) formed on the lower end of the upper transmission shaft (441). The lower transmission component (45) includes a transmission square shaft (451) inserted into a transmission square hole (444) and a lower transmission shaft (452) formed below the transmission square shaft (451). The lower transmission shaft (452) passes through an external threaded tube (214) and a perforated baffle (17). The lower end of the lower transmission shaft (452) is also provided with a second longitudinal bevel gear (453). The lower transmission component (45) also includes a lower torsion shaft (454) provided in a lower side hole (19) and a second transverse bevel gear (455) formed on the left side of the lower torsion shaft (454) and meshing with the second longitudinal bevel gear (453).

2. A pressure screen according to claim 1, characterized in that: The rotating assembly (21) includes an upper torsion shaft (211) rotatable in the upper side hole (18), a first transverse bevel gear (212) on the left side of the upper torsion shaft (211), and also includes an external threaded tube (214) rotatable in the central insertion hole (14), a first longitudinal bevel gear (215) located at the lower end of the external threaded tube (214) and meshing with the first transverse bevel gear (212), and a rotating ring (216) formed on the outer wall of the external threaded tube (214) and located in the bearing cavity (15).

3. A pressure screen according to claim 2, characterized in that: The rotating ring (216) is provided with a thrust bearing (217) on its upper and lower end faces respectively.

4. A pressure screen according to claim 3, characterized in that: At least three axial slots (432) are provided, and the axial slots (432) are evenly distributed in a ring along the circumferential direction. The outer wall of the nut (431).

5. A pressure screen according to claim 4, characterized in that: An upper rotating handle (213) is also provided on the right side of the upper torsion shaft (211).

6. A pressure screen according to claim 5, characterized in that: A lower rotary handle (456) is also provided on the right side of the lower torsion shaft (454).

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