CN211303442U

CN211303442U - Centrifuge scraper mechanism

Info

Publication number: CN211303442U
Application number: CN201922028569.XU
Authority: CN
Inventors: 秦建国; 马国新
Original assignee: Wuxi Huahe Industrial Control Equipment Manufacturing Co ltd
Current assignee: Wuxi Huahe Industrial Control Equipment Manufacturing Co ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-08-21
Anticipated expiration: 2029-11-21

Abstract

The utility model belongs to the technical field of centrifuge, concretely relates to centrifuge scraper mechanism, be used for striking off the scraper device of filter cake on the rotary drum inner wall including setting up on centrifuge, scraper device includes the drive arrangement of scraper and drive scraper work, and drive arrangement drive scraper is followed the initial position rotation and is cut into the position department of filter cake in the rotary drum and continue to be linear motion and strike off the filter cake until reacing the rotary drum bottom, and after the action was struck off to the scraper completion, drive arrangement drive scraper moved back to the top and rotatory initial position department to keeping away from the rotary drum bottom straight line, realized the automation of filter cake and struck off and clear away, need not manual operation, improve work efficiency, avoid the potential safety hazard simultaneously.

Description

Centrifuge scraper mechanism

Technical Field

The utility model belongs to the technical field of centrifuge, concretely relates to centrifuge scraper mechanism.

Background

A centrifuge is a device that uses centrifugal force to separate materials of different physical states or different densities. The centrifugal machine generally comprises a rotary drum, a chassis, a supporting part and the like, the rotary drum of the vertical type beater is driven to rotate by a transmission device, filter cloth or a screen is arranged on the inner side wall of the rotary drum and serves as a filtering medium, filtered filter cakes/filter residues are intercepted on the side wall of the rotary drum, and the filter cakes are manually cleaned out of the rotary drum by a shovel from a cover of the centrifugal machine after the centrifugal machine is stopped, so that the manual cleaning mode wastes time and labor, and meanwhile, potential safety hazards exist during manual cleaning.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a centrifuge scraper mechanism can realize the automatic of filter cake on the contra-rotating drum lateral wall and clear away, need not manual operation, improves work efficiency, avoids the potential safety hazard simultaneously.

In order to realize the technical purpose, the utility model discloses a following technical scheme: the utility model provides a centrifuge scraper mechanism, is used for striking off the scraper device of filter cake on the rotary drum inner wall including setting up on centrifuge, the scraper device includes the drive arrangement of scraper and drive scraper work, and drive arrangement drive scraper is rotatory from the initial position and is cut into the position department of filter cake in the rotary drum and continue to do linear motion and strike off the filter cake until reaching the rotary drum bottom, and after the scraper accomplished to strike off the action, drive arrangement drive scraper was from the rotary drum bottom straight line and is withdrawn to the top and rotatory to keeping away from the initial position department of rotary drum.

Preferably, the driving device is arranged above the rotary drum and is an air/oil cylinder, the air/oil cylinder comprises a straight cylinder body, a front cylinder cover and a rear cylinder cover are respectively arranged at two ends of the cylinder body, a piston is arranged in a cavity of the cylinder body, the telescopic motion direction of a piston rod in the cylinder body is parallel to the axial direction of the rotary drum, a spiral line groove is arranged on a rod body of the piston rod, a linear groove is arranged at one end of the piston close to the spiral line groove, one end of a connecting rod positioned in the cylinder body cavity is fixedly connected with the rear cylinder cover, the other end of the connecting rod is in sliding fit with the spiral line groove and the linear groove, a scraper is connected at the exposed end of the piston rod, when air/oil is supplied into a rodless cavity of the cylinder body, the piston is pushed to move, at the moment, the movable end of the connecting rod slides along the groove cavity of the spiral, the piston rod moves linearly to scrape off the filter cake until the filter cake reaches the bottom of the rotary drum; when the scraper finishes scraping action, the piston moves back when gas/oil is supplied to the rod cavity of the cylinder body, the movable end of the connecting rod slides along the groove cavities of the linear groove and the spiral groove, and the piston rod drives the scraper to linearly return to the top from the bottom of the rotary drum and rotate to an initial position far away from the rotary drum.

Preferably, the inner end of the piston rod penetrates through the piston and extends into the rodless cavity in the cylinder body, a central hole extending along the rod length direction is formed in the end portion of the inner end of the piston rod, a hole core of the central hole is overlapped with a rod core of the piston rod, and the spiral line groove is spirally arranged along the inner wall of the central hole.

Preferably, the sliding end of the connecting rod is bent into a short shaft with a bending angle of 90 degrees, the short shaft at the sliding end of the connecting rod is further connected with a bearing, and the bearing is arranged in the spiral groove and the linear groove and is attached to the groove walls at the two sides to form rolling or sliding fit.

Preferably, the sliding end of the connecting rod is connected with a short shaft perpendicular to the sliding end, the end of the short shaft is connected with a bearing, and the bearing is arranged in the spiral line groove, is attached to the inner cavities of the spiral line groove and the linear groove and is in rolling or sliding fit with the groove walls on the two sides.

Preferably, the width of the linear groove is consistent with that of the spiral groove, and the linear groove and the spiral groove are in continuous smooth transition.

Preferably, the spiral groove is formed by combining a plurality of groove sections, the rotation directions of the adjacent groove sections are the same or opposite, and the groove sections are in continuous smooth transition.

Preferably, the depth of the central hole is larger than the stroke length of the piston rod.

Preferably, the length of the connecting rod is greater than the stroke length of the piston rod.

Preferably, the scraper is arranged on the piston rod in a plurality, and comprises a cutter handle and a cutter head which are vertically arranged.

In the technical scheme, the following technical effects can be achieved:

1) after centrifuge accomplished centrifugal work, drive arrangement drive scraper from the initial position rotation cut in the position department of filter cake in the rotary drum and continue to be linear motion and strike off the filter cake until reaching the rotary drum bottom, the scraper accomplishes to strike off the action back to the filter cake, drive arrangement continues drive scraper and returns the top and rotatory initial position department to keeping away from the rotary drum bottom straight line, accomplish the action of striking off of a round, realize the automation of filter cake and strike off and clear away, need not manual operation, and the work efficiency is improved, and the potential safety hazard is avoided simultaneously.

2) The piston is pushed to move when gas and oil are supplied in a rodless cavity of the cylinder body, the bearing is positioned in the spiral line groove, because the short shaft and the connecting rod are fixed, the piston rod rotates in the moving process along the spiral line groove, the rotating direction is related to the rotating direction (left rotation and right rotation) of the spiral line groove and the moving direction (front extension and rear retraction) of the piston rod, the rotating angle is related to the starting point and the end point of the spiral line groove, the piston rod performs the compound motion of spiral rotation and linear motion, namely the piston rod drives the scraper to rotate from the initial position to cut into the top position of a filter cake in the rotary drum, and the cutting action is completed; the movable end of the connecting rod continues to slide along the groove cavity of the linear groove, the piston rod moves linearly to drive the scraper to scrape the filter cake until the filter cake reaches the bottom of the rotary drum, and the stroke is finished; when the scraper finishes scraping action, the piston does return movement when gas/oil is supplied to the rod cavity of the cylinder body, namely when the piston rod returns, the movable end of the connecting rod slides along the linear groove and the groove cavity of the spiral line groove to enter the linear groove first, the piston rod does linear movement, the piston rod drives the scraper to return to the top from the bottom of the rotary drum in a linear mode, the bearing enters the spiral line groove again to continue moving along the groove shape of the spiral line groove, the piston rod rotates in the reverse direction to drive the scraper to rotate to the position far away from the initial position of the rotary drum until the stroke is finished, and the scraper finishes scraping action completely once.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a schematic diagram of the mechanism of the air/oil cylinder;

FIG. 4 is a schematic structural view of a piston rod in an air/oil cylinder after the piston rod rotates spirally;

FIG. 5 is an enlarged view of a portion of the bearing within the cavity;

FIG. 6 is a spiral line diagram of the piston rod rotated a certain angle;

fig. 7 is a schematic view of the structure of the scraper.

Detailed Description

For the purpose of facilitating understanding, the present invention will be described in detail below with reference to the accompanying drawings.

A scraper mechanism of a centrifuge comprises a scraper device 80 arranged on a centrifuge 70 and used for scraping filter cakes A on the inner wall of a rotary drum 71, wherein the scraper device 80 comprises a scraper 90 and a driving device 100 for driving the scraper 90 to work, the driving device 100 drives the scraper 90 to cut into the position of the filter cakes A in the rotary drum 71 in a rotating mode from an initial position and continues to conduct linear motion to scrape the filter cakes A until the bottom of the rotary drum 71 is reached, and after the scraper 90 finishes scraping action, the driving device 100 drives the scraper 90 to linearly retreat from the bottom of the rotary drum 71 to the top and rotate to the initial position far away from the rotary drum 71. After the centrifugal machine 70 finishes centrifugal work, the driving device 100 drives the scraper 90 to rotationally cut into the position of the filter cake a in the rotary drum 71 from the initial position and continuously make linear motion to scrape the filter cake a until the filter cake a reaches the bottom of the rotary drum 71, after the scraper 90 finishes scraping action on the filter cake a, the driving device 100 continuously drives the scraper 90 to linearly retreat to the top from the bottom of the rotary drum 71 and rotate to the initial position far away from the rotary drum 71, so that one round of scraping action is finished, automatic scraping and removing of the filter cake a is realized, manual operation is not needed, the working efficiency is improved, and potential safety hazards are avoided.

The driving device 100 is arranged above the rotary drum 71 and is an air/oil cylinder, the air/oil cylinder comprises a straight cylinder 10, two ends of the cylinder 10 are respectively provided with a front cylinder cover 20 and a rear cylinder cover 30, a piston 40 is arranged in a tube cavity of the cylinder 10, the telescopic motion direction of a piston rod 50 in the cylinder 10 is parallel to the axial direction of the rotary drum 71, a rod body of the piston rod 50 is provided with a spiral line groove 51, one end of the piston 40, close to the spiral line groove 51, is provided with a linear groove 511, one end of a connecting rod 60 positioned in the tube cavity of the cylinder 10 is fixedly connected with the rear cylinder cover 30, the other end of the connecting rod forms sliding fit with the spiral line groove 51 and the linear groove 511, a scraper 90 is connected to the exposed end of the piston rod 50, when air/oil is supplied into a rodless cavity of the cylinder 10, the piston 40 is pushed to move, at the moment, the movable end of the connecting rod, the movable end of the connecting rod 60 continues to slide along the groove cavity of the linear groove 511, and the piston rod 50 makes a linear motion to scrape off the filter cake A until the filter cake A reaches the bottom of the rotary drum 71; when the scraper 90 finishes the scraping action, the piston 40 makes a retracting movement when the gas/oil is supplied to the rod cavity of the cylinder 10, the movable end of the connecting rod 60 slides along the linear groove 511 and the groove cavity of the spiral groove 51, the piston rod 50 drives the scraper 90 to linearly retract from the bottom of the rotary drum 71 to the top and rotate to an initial position far away from the rotary drum 71, and the scraper 90 finishes the scraping action completely and once.

Further, the inner end of the piston rod 50 extends into the rodless cavity in the cylinder 10 through the piston 40, a central hole 52 extending along the rod length direction is formed in the end portion of the inner end of the piston rod 50, a hole core of the central hole 52 is overlapped with a rod core of the piston rod 50, and the spiral groove 51 is spirally arranged along the inner wall of the central hole 52. One end of the connecting rod 60 is fixedly connected with the rear cylinder cover 30, and the other end of the connecting rod extends into the central hole 52 formed in the end part of the inner end of the piston rod 50 and forms sliding fit with the spiral line groove 51 on the inner wall of the central hole 52, so that the connecting rod 60 is prevented from interfering with the piston 40 when the piston rod 50 performs linear reciprocating motion and rotary motion simultaneously, and the linear reciprocating motion and the rotary motion of the piston rod 50 are more stable and reliable.

The sliding end of the connecting rod 60 is bent into a short shaft 62 with a bending angle of 90 degrees, the short shaft 62 at the sliding end of the connecting rod 60 is also connected with a bearing 61, and the bearing 61 is arranged in the cavities of the spiral line groove 51 and the linear groove 511 and is attached to the groove walls at two sides to form rolling or sliding fit. The bent sliding end of the connecting rod 60 extends into the spiral line groove 51, and meanwhile, in order to avoid the problem that the sliding end of the connecting rod 60 is blocked when sliding in the spiral line groove 51, the sliding end of the connecting rod 60 is connected with a bearing 61 to transmit torsion, the two are in interference fit, the starting point and the terminal point of the spiral line groove 51 are in large arc transition, and the stability of the connecting rod 60 in the motion process after the sliding end is connected with the bearing 61 is guaranteed.

As another embodiment, the sliding end of the connecting rod 60 is connected with a short shaft 62 perpendicular to the sliding end, the end of the short shaft 62 is connected with a bearing 61, and the bearing 61 is arranged in the spiral line groove 51, is attached to the inner cavities of the spiral line groove 51 and the linear groove 511 and forms rolling or sliding fit with the groove walls on the two sides. The minor axis 62 that the slip end of connecting rod 60 is connected stretches into in the spiral slot 51, avoids minor axis 62 to block when sliding in spiral slot 51 dead simultaneously, and the application is connected with bearing 61 on the minor axis 62 and transmits torsion, and both are interference fit, guarantee the stability of minor axis 62 and bearing 61 connection back in the motion process, and bearing 61 here can select antifriction bearing or slide bearing, also or other cooperation looser and gapped connecting piece.

The width of the linear slot 511 is consistent with that of the spiral slot 51, and the linear slot 511 and the spiral slot 51 are in continuous smooth transition.

The specific motion process is described in detail below: when the stroke starts, the piston 40 is pushed to move when gas and oil are supplied into a rodless cavity of the cylinder body 10, the bearing 61 is positioned in the spiral line groove 51, because the short shaft 62 and the connecting rod 60 are fixed, in the moving process along the spiral line groove 51, the piston rod 50 rotates, the rotating direction is related to the rotating direction (left rotation and right rotation) of the spiral line groove 51 and the moving direction (front extension and rear retraction) of the piston rod 50, the rotating angle is related to the starting point and the end point of the spiral line groove 51, the piston rod 50 performs the compound motion of spiral rotation and linear motion, namely the piston rod 50 drives the scraper 90 to rotate from the initial position to cut into the top position of a filter cake A in the rotary drum 71, and the cutting action is completed; the movable end of the connecting rod 60 continues to slide along the groove cavity of the linear groove 511, the piston rod 50 makes a linear motion to drive the scraper 90 to scrape the filter cake A until the filter cake A reaches the bottom of the rotary drum 71, and the stroke is finished; after the scraper 90 finishes the scraping action, the piston 40 makes a return movement when the gas/oil is supplied in the rod cavity of the cylinder 10, that is, when the piston rod 50 returns, the movable end of the connecting rod 60 slides along the linear groove 511 and the groove cavity of the spiral groove 51 and enters the linear groove 511 first, the piston rod 50 makes a linear movement, the piston rod 50 drives the scraper 90 to return to the top from the bottom of the rotary drum 71, the bearing 61 enters the spiral groove 51 again and continues to move along the groove shape of the spiral groove 51, and the piston rod 50 makes a reverse rotation to drive the scraper 90 to rotate to an initial position far away from the rotary drum 71 until the stroke is finished.

In order to realize more movement modes, namely, to realize multiple movement modes of the scraper 90, not only rotary cut-in and linear movement, the spiral groove 51 is formed by combining a plurality of groove sections, meanwhile, the rotation directions of adjacent groove sections are the same or opposite, the groove sections are in continuous smooth transition, different groove sections are flexibly combined, and reasonable screw pitches are set for the groove sections according to requirements so as to obtain the movement of the piston rod 50 meeting the requirements.

The depth of the central hole 52 is larger than the stroke length of the piston rod 50, so that enough machining allowance is left before and after the spiral groove 51, and in addition, the diameter of the central hole 52 is as large as possible on the premise of not influencing the strength of the piston rod 50, so that the connecting rod 60 has enough installation space.

The length of the connecting rod 60 is greater than the stroke length of the piston rod 50.

In order to ensure that the scraping effect of the scraper 90 is better and the scraper is cleaner, the scraper 90 is provided with a plurality of scrapers on the piston rod 50, each scraper 90 comprises a cutter handle 91 and a cutter head 92, the cutter handles 91 and the piston rod 50 are arranged at a certain angle, and the cutter handles 91 and the cutter heads 92 are vertically arranged.

Claims

1. A centrifuge scraper mechanism is characterized in that: the scraper device (80) is arranged on a centrifugal machine (70) and used for scraping a filter cake (A) on the inner wall of a rotary drum (71), the scraper device (80) comprises a scraper (90) and a driving device (100) for driving the scraper (90) to work, the driving device (100) drives the scraper (90) to rotate from an initial position and cut into the position of the filter cake (A) in the rotary drum (71) and continue to do linear motion to scrape the filter cake (A) until the bottom of the rotary drum (71) is reached, and after the scraper (90) finishes scraping action, the driving device (100) drives the scraper (90) to linearly retreat from the bottom of the rotary drum (71) to the top and rotate to the initial position far away from the rotary drum (71).

2. A centrifuge scraper mechanism according to claim 1, wherein: the driving device (100) is arranged above the rotary drum (71) and is an air/oil cylinder, the air/oil cylinder comprises a straight cylinder body (10), a front cylinder cover (20) and a rear cylinder cover (30) are respectively arranged at two ends of the cylinder body (10), a piston (40) is arranged in a pipe cavity of the cylinder body (10), the telescopic motion direction of a piston rod (50) in the cylinder body (10) is parallel to the axial direction of the rotary drum (71), a rod body of the piston rod (50) is provided with a spiral line groove (51), one end, close to the spiral line groove (51), of the piston (40) is provided with a linear groove (511), one end, located in the pipe cavity of the cylinder body (10), of a connecting rod (60) is fixedly connected with the rear cylinder cover (30), the other end of the connecting rod is in sliding fit with the spiral line groove (51) and the linear groove (511), a scraper (90) is connected at the exposed end of the piston rod (50), and the, at the moment, the movable end of the connecting rod (60) slides along the groove cavity of the spiral groove (51), the piston rod (50) drives the scraper (90) to cut into the top position of a filter cake (A) in the rotary drum (71) in a rotating mode from an initial position, the movable end of the connecting rod (60) continues to slide along the groove cavity of the linear groove (511), and the piston rod (50) conducts linear motion to scrape the filter cake (A) until the piston rod reaches the bottom of the rotary drum (71); after the scraper (90) finishes the scraping action, when gas/oil is supplied into a rod cavity of the cylinder body (10), the piston (40) moves back, the movable end of the connecting rod (60) slides along the linear groove (511) and the groove cavity of the spiral groove (51), and the piston rod (50) drives the scraper (90) to linearly return to the top from the bottom of the rotary drum (71) and rotate to an initial position far away from the rotary drum (71).

3. A centrifuge scraper mechanism according to claim 2, wherein: the inner end of the piston rod (50) penetrates through the piston (40) to extend into a rodless cavity in the cylinder body (10), a center hole (52) extending along the rod length direction is formed in the end portion of the inner end of the piston rod (50), a hole core of the center hole (52) is overlapped with a rod core of the piston rod (50), and the spiral line groove (51) is spirally arranged along the inner wall of the center hole (52).

4. A centrifuge scraper mechanism according to claim 2 or 3, wherein: the sliding end of the connecting rod (60) is bent into a short shaft (62) with a bending angle of 90 degrees, the short shaft (62) at the sliding end of the connecting rod (60) is also connected with a bearing (61), and the bearing (61) is arranged in the groove cavities of the spiral groove (51) and the linear groove (511) and is attached to the groove walls at two sides to form rolling or sliding fit.

5. A centrifuge scraper mechanism according to claim 2 or 3, wherein: the sliding end of the connecting rod (60) is connected with a short shaft (62) perpendicular to the connecting rod, the end of the short shaft (62) is connected with a bearing (61), and the bearing (61) is arranged in the spiral line groove (51), is attached to the groove cavities of the spiral line groove (51) and the linear groove (511) and forms rolling or sliding fit with the groove walls on the two sides.

6. A centrifuge scraper mechanism according to claim 2, wherein: the groove width of the linear groove (511) is consistent with that of the spiral groove (51), and the linear groove (511) and the spiral groove (51) are in continuous smooth transition.

7. A centrifuge scraper mechanism according to claim 2, wherein: the spiral line groove (51) is formed by combining a plurality of groove sections, the rotation directions of the adjacent groove sections are the same or opposite, and the groove sections are in continuous smooth transition.

8. A centrifuge scraper mechanism according to claim 3, wherein: the depth of the central hole (52) is larger than the stroke length of the piston rod (50).

9. A centrifuge scraper mechanism according to claim 2, wherein: the length of the connecting rod (60) is larger than the stroke length of the piston rod (50).

10. A centrifuge scraper mechanism according to claim 2, wherein: the scraper (90) is arranged on the piston rod (50) in a plurality of numbers, the scraper (90) comprises a cutter handle (91) and a cutter head (92), and the cutter handle (91) and the cutter head (92) are vertically arranged.