Scraper assembly for centrifugal machine

Abstract

The scraper assembly comprises a base, a shaft sleeve, a center shaft, a lead screw and a scraper component, the shaft sleeve is sleeved with the base, the center shaft is sleeved with the shaft sleeve, the scraper component is installed at one end of the center shaft, a threaded groove hole is formed in the other end of the center shaft, and the lead screw is in threaded connection with the interior of the threaded groove hole. The first driving piece is in transmission connection with the lead screw, and the second driving piece is in transmission connection with the shaft sleeve. Axial rotation of the lead screw is converted into lifting motion of the center shaft through threaded connection of the lead screw and the threaded groove hole, firmness and stability of connection of the center shaft and the lead screw are improved, the rack is driven to move horizontally through stretching and retracting of the hydraulic cylinder, displacement motion of the rack is converted into axial rotation motion of the annular fluted disc part, and the lifting motion of the center shaft is improved. Damage of the rack and the annular fluted disc part caused by loose connection of the rack and the annular fluted disc part is reduced, and power loss is reduced through direct-connection servo drive formed with the lead screw.

Description

Technical Field

[0001] The utility model relates to the technical field of scrapers, in particular to a scraper assembly for a centrifuge. Background Art

[0002] In the scraper unloading centrifuge, the main motor drives the inner and outer drums to rotate at full speed. The material is introduced into the drum through the feed pipe. Under the action of centrifugal force, the liquid phase passes through the filter cloth and the filter holes on the inner drum wall and is discharged from the inner drum. It is collected in the gap between the inner and outer drums, passes through the through hole to the siphon chamber and enters the siphon chamber, and is then sucked out of the machine by the siphon device. Among them, the solid phase is trapped in the inner drum to form an annular filter cake layer, which needs to be cleaned by a scraper. The commonly used hydraulic scraper assembly converts hydraulic energy into mechanical energy up and down, performs linear reciprocating motion, and rotates left and right through gear drive for rotational motion. The wear rate of connecting parts is often high, which affects the performance of the equipment. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model provides a scraper assembly for a centrifuge.

[0004] The utility model provides a scraper assembly for a centrifuge, comprising: a base, a shaft sleeve, a central shaft, a screw rod, and a scraper component. The base is internally sleeved with a shaft sleeve, the shaft sleeve is internally sleeved with a central shaft that can move axially, one end of the central shaft extends out of the shaft sleeve inner cavity and the scraper component is installed on the end, the other end of the central shaft is coaxially provided with a threaded slot hole inwardly, the screw rod with one end extending into the threaded slot hole is threadedly connected in the threaded slot hole, and also comprises: a first driving member connected to the screw rod in a transmission manner, and a second driving member connected to the shaft sleeve in a transmission manner for driving the shaft sleeve to drive the central shaft to rotate axially.

[0005] As a further optimization of the above solution, an annular gear disc portion is fixedly sleeved on the shaft sleeve, and the second driving member specifically includes: a rack meshingly connected to the annular gear disc portion, and one end of the rack is coaxially connected to the output end of the hydraulic cylinder fixedly mounted on the base.

[0006] As a further optimization of the above scheme, the second driving member also includes an adjusting rod and a proximity switch sensor installed on the base. The proximity switch sensor is installed next to the rack for adjusting the end position of the rack, and the adjusting rod is installed on one side of the free end of the rack for limiting the sliding range of the rack.

[0007] As a further optimization of the above solution, the annular gear plate portion and the second driving member are located below the end of the screw rod extending into the central shaft and are arranged on the base close to the free end of the screw rod.

[0008] As a further optimization of the above solution, the first driving member specifically includes a servo motor or a hydraulic motor installed on the base, and the output end of the servo motor or the hydraulic motor is coaxially fixedly connected to the end of the screw rod away from the sleeve.

[0009] As a further optimization of the above solution, a plurality of vertical slide grooves extending along the axial direction of the sleeve are provided on the inner wall of the sleeve, and a plurality of clamping strips matching with the vertical slide grooves are connected to the outer wall of the central shaft.

[0010] In the utility model, the scraper assembly proposed in the utility model, the first driving member drives the screw rod to rotate, and the axial rotation of the screw rod is converted into the lifting movement of the central shaft through the threaded connection between the screw rod and the threaded slot hole, thereby improving the firmness and stability of the connection between the central shaft and the screw rod, so that the scraper component installed at the end of the central shaft is displaced to the preset working height, and then the second driving member drives the shaft sleeve to drive the central shaft to rotate axially, so that the scraper component rotates axially, so that the effective end of the scraper component abuts against the material on the inner wall of the centrifuge drum to scrape the material off, and the rack is driven by the extension and contraction of the hydraulic cylinder. By performing horizontal displacement, the displacement movement of the rack is converted into the axial rotation movement of the annular gear disk part. On the basis of the correspondence between the displacement change value of a single extension and contraction of the hydraulic cylinder and the angle change value of a single rotation of the scraper part, the overall linkage is improved, and on the basis of the stable voltage stabilization state that can be achieved inside the hydraulic cylinder, the stability of the connection between the rack and the annular gear disk part is improved, and the damage to the rack and the annular gear disk part caused by loose connection between the rack and the annular gear disk part is reduced. By allowing the first drive member to act as a servo drive directly connected to the screw rod, the power loss is reduced and the compactness of the overall structure of the scraper assembly of the present application is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural schematic diagram of an implementation method of a centrifuge scraper assembly proposed by the utility model;

[0012] Figure 2 This is a schematic diagram of the formal structure section of an implementation mode of a centrifuge scraper assembly proposed by the utility model;

[0013] Figure 3 The utility model is a schematic diagram of a partial cross-sectional top view of a centrifuge scraper assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0014] like Figure 1 As shown, Figure 1 The utility model is a structural schematic diagram of an implementation mode of a scraper assembly for a centrifuge.

[0015] Reference Figure 1 and Figure 2The utility model proposes a centrifuge scraper assembly, comprising: a base 1, a sleeve 2, a central shaft 3, a screw 4, and a scraper component 5. The base 1 is internally sleeved with a sleeve 2, and the sleeve 2 is sleeved with an axially movable central shaft 3. One end of the central shaft 3 extends out of the inner cavity of the sleeve 2 and the scraper component 5 is installed on the end. The other end of the central shaft 3 is coaxially provided with a threaded slot 6 inwardly, and the threaded slot 6 is internally threadedly connected to the screw 4 with one end extending into the threaded slot 6. The utility model also includes: a first driving member 11 connected to the screw 4 in a transmission manner, and a second driving member connected to the sleeve 2 in a transmission manner for driving the sleeve 2 to drive the central shaft 3 to rotate axially.

[0016] During the specific working process of the scraper assembly of this embodiment, the scraper assembly is assembled to the centrifuge, and the first driving member 11 drives the screw rod 4 to rotate. The axial rotation of the screw rod 4 is converted into the lifting movement of the central shaft 3 through the threaded transmission of the screw rod 4 and the threaded slot 6, so that the scraper component 5 installed at the end of the central shaft 3 is displaced to the preset working height, and then the central shaft 3 is driven axially by the second driving member to drive the sleeve 2, so that the scraper component 5 is axially rotated, so that the active end of the scraper component 5 is against the material on the inner wall of the centrifuge drum to scrape the material off.

[0017] The present application improves the stability of the transmission of the central shaft 3 through the threaded transmission connection between the screw rod 4 and the threaded slot 6. The complex bearing surface of the threaded connection directly increases the firmness of the connection between the central shaft 3 and the screw rod 4, reduces the wear of the scraper assembly, and improves the service life and performance of the scraper assembly.

[0018] Reference Figure 3 In this embodiment, an annular toothed disk portion 7 is fixedly sleeved on the shaft sleeve 2, and the second driving member specifically includes: a rack 8 meshingly connected to the annular toothed disk portion 7, and one end of the rack 8 is coaxially connected to the output end of a hydraulic cylinder 9 fixedly mounted on the base 1.

[0019] The rack 8 is driven to move horizontally by the extension and retraction of the hydraulic cylinder 9, and the displacement movement of the rack 8 is converted into the axial rotation movement of the annular gear disk part 7. The displacement change value of a single extension and retraction of the hydraulic cylinder 9 corresponds to the angle change value of a single rotation of the scraper component 5, thereby improving the overall linkage. A stable voltage stabilizing state can be achieved inside the hydraulic cylinder 9, thereby improving the stability of the connection between the rack 8 and the annular gear disk part 7 and reducing damage to the rack 8 and the annular gear disk part 7 caused by loose connection between the rack 8 and the annular gear disk part 7.

[0020] Among them, the second driving member also includes an adjusting rod 10 and a proximity switch sensor 14 installed on the base 1. The proximity switch sensor 14 is installed next to the rack 8 for adjusting the end position of the rack 8. The adjusting rod 10 is installed on one side of the free end of the rack 8 for limiting the sliding range of the rack 8.

[0021] In the present application, the proximity switch sensor 14 can directly adjust the distance between the free end of the rack 8 and the adjusting rod 10, further realizing the control accuracy of the axial rotation angle of the scraper component 5, and limiting the horizontal sliding range of the free end of the rack 8 through the adjusting rod 10. Once an error occurs in the hydraulic cylinder 9 or the scraper component 5 is hit by the material and generates a reaction force, the end of the adjusting rod 10 will form a conflict with the free end of the rack 8, thereby protecting the rack 8, the annular gear disc portion 7 and the scraper component 5.

[0022] In this embodiment, the annular gear disk portion 7 and the second driving member are located below the end of the screw rod 4 extending into the central shaft 3 and are arranged on the base 1 close to the free end of the screw rod 4, so as to avoid setting the annular gear disk portion 7 in the outer wall area where the threaded groove hole 6 is opened on the central shaft 3, which would affect the overall toughness of the central shaft 3 and improve the overall firmness of the central shaft 3.

[0023] In this embodiment, the first driving member 11 specifically includes a servo motor or a hydraulic motor installed on the base 1, and the output end of the servo motor or the hydraulic motor is coaxially fixedly connected to the end of the screw rod 4 away from the sleeve 2, so that the output end of the first driving member 11 is directly connected to the screw rod 4. By allowing the first driving member 11 to serve as a servo drive directly connected to the screw rod, power loss is reduced and the compactness of the overall structure of the scraper assembly of the present application is improved.

[0024] In this embodiment, a plurality of vertical grooves 12 extending axially along the sleeve 2 are opened on the inner wall of the sleeve 2, and a plurality of clip portions 13 cooperating with the vertical grooves 12 are connected to the outer wall of the center shaft 3, so that the center shaft 3 can move axially in the sleeve 2, and the cooperation between the vertical grooves 12 and the clip portions 13 enables the center shaft 3 and the sleeve 2 to meet the requirements of synchronous axial rotation.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A scraper assembly for a centrifuge, characterized in that: include: A base (1), a sleeve (2), a center shaft (3), a screw rod (4), and a scraper component (5); the base (1) is internally sleeved with a sleeve (2) for rotation; the sleeve (2) is internally sleeved with an axially movable center shaft (3); one end of the center shaft (3) extends out of the inner cavity of the sleeve (2) and the scraper component (5) is installed on the end; the other end of the center shaft (3) is provided with a threaded slot (6) coaxially inwardly; the threaded slot (6) is internally threadedly connected to a screw rod (4) whose one end extends into the threaded slot (6); and the base (1) further comprises: a first driving member (11) drivingly connected to the screw rod (4); and a second driving member drivingly connected to the sleeve (2) for driving the sleeve (2) to drive the center shaft (3) to axially rotate; An annular toothed disc portion (7) is fixedly sleeved on the shaft sleeve (2), and the second driving member specifically comprises: a rack (8) meshingly connected to the annular toothed disc portion (7), one end of the rack (8) being coaxially connected to an output end of a hydraulic cylinder (9) fixedly mounted on the base (1); The second driving member also includes an adjusting rod (10) and a proximity switch sensor (14) mounted on the base (1); the proximity switch sensor (14) is mounted beside the rack (8) for adjusting the end position of the rack (8); and the adjusting rod (10) is mounted on one side of the free end of the rack (8) for limiting the sliding range of the rack (8).

2. The scraper assembly according to claim 1, characterized in that: The annular toothed disc portion (7) and the second driving member are located below the end of the screw rod (4) extending into the central shaft (3) and are arranged on the base (1) close to the free end of the screw rod (4).

3. The scraper assembly according to claim 1, characterized in that: The first driving member (11) specifically comprises a servo motor or a hydraulic motor mounted on the base (1), and the output end of the servo motor or the hydraulic motor is coaxially fixedly connected to the end of the screw rod (4) away from the shaft sleeve (2).

4. The scraper assembly according to claim 1, characterized in that: A plurality of vertical slide grooves (12) extending along the axial direction of the shaft sleeve (2) are provided on the inner wall of the shaft sleeve (2), and a plurality of clamping strips (13) matching with the vertical slide grooves (12) are connected to the outer wall of the central shaft (3).

Images