CN211250617U - Operation platform for polishing blank column - Google Patents

Abstract

The utility model discloses an operation platform for polishing blank column, which solves the problem that the blank column may slide down due to the axial clamping force, the technical proposal is that the operation platform for polishing the blank column comprises a clamping component and a power component, both ends of the blank column are cuboid bases, the clamping component axially clamps the blank column, the axis of the clamping component coincides with the axis of the blank column, the power component drives the clamping component to rotate around the axis, the clamping component comprises a driving clamp base and a driven clamp base which are vertical to the axis of the blank column, the driven clamp base moves along the axis of the blank column, the driving clamp base and the driven clamp base are provided with spacing pieces which are vertical to the driving clamp base and the driven clamp base and abut against four sides of the bases, so that the blank column is clamped by the axial clamping force and the radial constraint force, the accidents caused by the fact that the blank column slips due to insufficient axial clamping force when rotating around the axis of the blank column are avoided.

Description

Operation platform for polishing blank column

Technical Field

The utility model relates to a production field of GRC product, in particular to operation platform of blank post of polishing.

Background

GRC represents glass fiber reinforced concrete, and is a fiber cement composite material which takes alkali-resistant glass fiber as a reinforcing material and cement mortar as a matrix material. The GRC product is prepared by stirring raw materials according to a certain proportion, and pouring and molding in a mold, and can produce products with rich shapes and various textures. However, after the GRC product is removed from the mold, the surface of the GRC product has some burrs that need to be smoothed.

For example, the chinese patent with the publication number CN209453280U, "a trimming device for ceramic-processing blanks", discloses a trimming device for ceramic-processing blanks, which comprises a worktable, wherein a grinding plate fixing seat is arranged on the worktable, a grinding plate is fixed on the grinding plate fixing seat, the grinding plate is provided with a recess corresponding to the outer cross section of the ceramic blank to be processed, a chute is arranged on the worktable at the left side of the grinding plate fixing seat, a left fixing column is connected to the chute in a left-right sliding manner through a sliding block, a locking bolt is further arranged on the sliding block, a left fixing rod is rotatably connected to the left fixing column through a bearing, a left abutting portion is arranged at the right end of the left fixing rod, an inflation joint is further arranged in the middle of the left fixing rod, an inflation port is arranged on the inflation joint, an air bag is further arranged on the left fixing rod between the inflation joint and the left abutting portion, the left end of pivot is equipped with right butt portion, and the right-hand member of pivot passes right fixed column and is connected with gear motor's output shaft.

The ceramic processing blank trimming device clamps a ceramic blank through two fixing columns, and clamps and supports the ceramic blank in an inner cavity of the ceramic blank after the airbag on the left fixing rod expands. The ceramic blank is driven by a motor to rotate along the axis of the ceramic blank after being clamped. Meanwhile, a grinding plate with a recess corresponding to the outer section of the processed ceramic blank is arranged below the ceramic blank body. And grinding and trimming burrs on the periphery of the ceramic blank by using a grinding disc. But this GRC blank post product does not have the cavity, can't use the gasbag to support, only relies on the butt portion at blank post both ends and fixes with the frictional force between the blank post. And the axial clamping force of the abutting part on the blank column is insufficient, so that the friction force between the abutting part and the blank column is insufficient, the blank column can slip in the rotating process, and accidents are caused, so that the improvement is needed.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide an operation platform of blank post of polishing not only receives axial clamp force when making the blank post by the centre gripping, receives radial about the power simultaneously, avoids the blank post to cause the accident because of the axial clamp force is not enough in-process around self axis rotation.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides an operation platform of blank post of polishing, includes centre gripping subassembly and power component, blank post both ends are the base of cuboid form, centre gripping subassembly axial clamp is tight blank post, the axis of centre gripping subassembly coincides with the axis of blank axle, power component drive centre gripping subassembly is rotatory around self axis, the centre gripping subassembly includes the initiative anchor clamps base and the driven anchor clamps base of perpendicular to blank post axis, the axis removal of blank post is followed to the driven anchor clamps base, be provided with spacing piece on initiative anchor clamps base and the driven anchor clamps base, four sides of spacing piece perpendicular to initiative anchor clamps base and driven anchor clamps base and butt base.

By adopting the technical scheme, when the blank column is clamped by the clamping assembly and the power assembly drives the blank column to rotate along the axis of the blank column, the driven clamp base moves towards the blank column along the axis direction of the blank column and is matched with the driving clamp base to axially clamp the blank column; simultaneously, spacing piece and four side butts of the base of blank post, radial spacing blank post make the centre gripping subassembly more reliable and more stable to the centre gripping of blank post, have avoided the blank post to cause the accident because of the axial clamp force is not enough in the rotatory in-process of self axis.

The utility model discloses further set up to: the top point of the limit sheet attaching base is simultaneously contacted with two side surfaces of the base, and the length of the limit sheet in the length direction of the side surface of the base is smaller than half of the length of the side surface of the base.

Through adopting above-mentioned technical scheme, spacing piece is only in the base contact at the summit of base, and spacing piece is when providing radial constraining force for the blank post, and the area of contact between four sides of spacing piece and blank post base reduces, has reduced the possibility of spacing piece fish tail base in rotatory process.

The utility model discloses further set up to: the limiting pieces are symmetrically arranged about the rotation centers of the driving clamp base and the driven clamp base.

Through adopting above-mentioned technical scheme, spacing piece still can provide radial constraining force for the blank post on four sides of base, but spacing piece quantity on every anchor clamps base only has two, and the area of contact between spacing piece and the blank post further reduces, has further reduced the possibility that the blank post is by spacing piece fish tail base in rotatory process.

The utility model discloses further set up to: still include the support, the support includes first fixed beam, the fixed roof beam of second, first sliding beam and second sliding beam, the centre gripping subassembly still includes initiative pivot and driven spindle, the one end that blank post was kept away from in the initiative pivot is rotated with first fixed beam and is connected, the one end that blank post was kept away from to the driven shaft rotates with first sliding beam to be connected, the fixed roof beam of second rotates with the blank post to be connected and is located between blank post and the first fixed beam, the second sliding beam rotates with the blank post to be connected and is located between blank post and the first sliding beam.

Through adopting above-mentioned technical scheme, after the centre gripping subassembly presss from both sides tight blank post, the weight of blank post is supported by initiative pivot and driven spindle. However, because the distance between the first fixed beam supporting the driving rotating shaft and the first sliding beam supporting the driven rotating shaft and the blank column is relatively long, the axes of the driving rotating shaft and the driven rotating shaft may bend downwards when supporting the weight of the blank column, so that the axes of the driving rotating shaft and the driven rotating shaft are not completely overlapped with the axis of the blank column, and the blank column is caused to shake in the rotating process. The gravity of blank post has been shared in the setting of second fixed beam and second slip roof beam, has reduced the crooked possibility of initiative pivot and driven spindle axis, and then makes the rotation of blank post more steady.

The utility model discloses further set up to: the driving rotating shaft is provided with a first positioning shaft shoulder on one side, facing the blank column, of the second fixing beam, and the driven rotating shaft is provided with a second positioning shaft shoulder on one side, facing the blank column, of the second sliding beam.

By adopting the technical scheme, in the process of axially clamping the blank column by the clamping assembly, the second sliding beam slides towards the blank column, and the second positioning shaft shoulder prevents the driven rotating shaft and the second sliding beam from axially sliding; meanwhile, the first positioning shaft shoulder prevents the driving rotating shaft and the second fixing beam from axially sliding, so that the axial clamping effect of the clamping assembly on the blank column is improved.

The utility model discloses further set up to: still include the removal subassembly, the removal subassembly includes the lead screw, the lead screw rotates with first sliding beam and second sliding beam to be connected.

Through adopting above-mentioned technical scheme, the first sliding beam of rotation drive of lead screw and second sliding beam along the axis direction reciprocating motion of blank post. And after the first sliding beam and the second sliding beam move in place, namely the blank column is axially clamped, the possibility that the first sliding beam and the second sliding beam move towards the direction far away from the blank column due to vibration is reduced by the screw rod, so that the axial clamping effect of the clamping assembly on the blank column is improved.

The utility model discloses further set up to: the moving assembly further comprises a hand wheel, and the hand wheel drives the lead screw to rotate.

Through adopting above-mentioned technical scheme, the radius size of hand wheel is the arm of force length of the rotatory arm of force of drive lead screw promptly, and setting up of hand wheel has lengthened the rotatory arm of force of drive lead screw for the workman is rotating the hand wheel and then drive lead screw and rotate and finally drive the in-process that first sliding beam and second sliding beam slip press from both sides tight blank post more laborsavingly, has improved workman's work efficiency.

The utility model discloses further set up to: the movable assembly further comprises a connecting plate and a lantern ring which are fixedly connected, the lead screw penetrates through the connecting plate and the lantern ring and is in threaded connection with the connecting plate and the lantern ring, the number of the connecting plates is two, the connecting plates are respectively and fixedly connected with the first sliding beam and the second sliding beam, and the connecting plate on the second sliding beam is located on one side, facing the blank column, of the second sliding beam.

Through adopting above-mentioned technical scheme, the setting of lantern ring has increased connecting plate and lead screw threaded connection's area, has avoided the screw on the connecting plate because of bearing load is big serious wearing and tearing. Meanwhile, the connecting plate on the second sliding beam can prevent part of dust generated in the process of polishing the blank column from falling on the lead screw on one side, deviating from the blank column, of the connecting plate, and the possibility of blocking caused by the dust when the lead screw drives the lantern ring and the connecting plate to move is reduced.

To sum up, the utility model discloses following beneficial effect has:

1. when the blank column is clamped by the clamping assembly and the power assembly drives the blank column to rotate along the axis of the blank column, the limiting pieces are abutted against four side faces of the base of the blank column to radially limit the blank column, so that the clamping assembly can more stably and reliably clamp the blank column, and accidents caused by the fact that the blank column slides down due to insufficient axial clamping force in the process of rotating around the axis of the blank column are avoided;

2. the limiting pieces are only in base contact at the top point of the base, the number of the limiting pieces on each clamp base is only two, the limiting pieces provide radial constraint force for the blank column, meanwhile, the contact area between the limiting pieces and the four side surfaces of the base of the blank column is reduced, and the possibility that the base is scratched by the limiting pieces in the rotation process of the blank column is reduced;

3. the operation that the hand wheel is rotated to drive the screw rod to rotate is labor-saving and rapid, and the rotation of the screw rod drives the first sliding beam and the second sliding beam to reciprocate along the axis direction of the blank column. After the first sliding beam and the second sliding beam move in place, namely the blank column is axially clamped, the possibility that the first sliding beam and the second sliding beam move towards the direction far away from the blank column due to vibration is reduced by the screw rod, and therefore the axial clamping effect of the clamping assembly on the blank column is improved;

4. after the clamping assembly clamps the blank column, the gravity of the blank column is shared by the second fixing beam and the second sliding beam, the possibility of axial bending of the driving rotating shaft and the driven rotating shaft is reduced, and further the blank column is enabled to rotate more stably.

Drawings

FIG. 1 is a first schematic structural view of the worktable for grinding blank columns;

FIG. 2 is a second structural schematic diagram of the worktable for polishing the blank column;

fig. 3 is a third structural schematic diagram of the workbench for polishing the blank column.

Reference numerals: 1. a blank column; 11. a base; 12. a decorative post; 2. a support; 21. a cross beam; 211. a chute; 22. a first fixed beam; 23. a second fixed beam; 24. a first sliding beam; 25. a second sliding beam; 26. a connecting rod; 27. fixing the rod; 3. a moving assembly; 31. a hand wheel; 32. a lead screw; 321. a locknut; 322. a gasket; 33. a connecting plate; 331. a collar; 34. a first fixed support; 35. a second fixed support; 4. a clamping assembly; 41. an active clamp body; 411. a drive shaft, 412, a pulley; 413. a first locating shoulder; 414. an active clamp base; 4141. an active limiting sheet; 42. a driven clamp body; 421. a driven rotating shaft; 422. a second locating shoulder; 423. a driven clamp base; 4231. a driven limiting sheet; 5. a power assembly; 51. a drive member; 52. a belt.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, a work table for grinding columns of blanks comprises a support 2 constituting the work table.

The blank column 1 is manufactured by a mould and consists of two bases 11 and a section of decorative column 12. The bases 11 are cuboid, the two bases 11 are identical in size and shape, and the bottom surfaces of the two bases 11 are perpendicular to the axis of the blank column 1.

The decorative column 12 is positioned between the two bases 11, and the axis of the decorative column 12 is coincident with the central line of the two bases 11, which is perpendicular to the bottom surface.

The support 2 comprises two cross beams 21 parallel to each other and of equal length. The beam 21 is in the shape of a rectangular parallelepiped and is located on the upper surface of the bracket 2. The cross beam 21 is horizontally arranged and the length direction thereof is parallel to the axial direction of the blank column 1.

Two sliding grooves 211 are arranged on the upper surface of the opposite side of the two cross beams 21. The slide groove 211 is provided along the length direction of the cross member 21 and has the same length as the cross member 21.

A first sliding beam 24 and a second sliding beam 25 are also horizontally arranged on the bracket 2. The first sliding beam 24 and the second sliding beam 25 are identical in shape and length, and the first sliding beam 24 and the second sliding beam 25 are located between the two cross beams 21 and are perpendicular to the cross beams 21.

The first sliding beam 24 and the second sliding beam 25 are both long bar-shaped, the length of the first sliding beam is the same as the distance between the two cross beams 21, and the lower bottom surfaces of the two ends of the first sliding beam 24 and the second sliding beam 25 are respectively pressed in the two sliding grooves 211 and horizontally reciprocate along the length direction of the sliding grooves 211.

The second sliding beam 25 is located on the side of the first sliding beam 24 adjacent to the blank column 1.

The bracket 2 further comprises a connecting rod 26. The connecting rod 26 is in the form of a long bar, and is disposed parallel to the cross member 21. Both ends of the connecting rod 26 are welded and fixed to the upper surfaces of the first and second sliding beams 24 and 25, respectively.

The length of the connecting rod 26 determines the spacing between the first 24 and second 25 sliding beams. The number of connecting rods 26 is stable according to the actual situation, where the number of connecting rods 26 is two.

The bracket 2 is also provided with a first fixed beam 22 and a second fixed beam 23. The first fixed beam 22 and the second fixed beam 23 are identical in shape and length and perpendicular to the cross beam 21.

The first fixed beam 22 and the second fixed beam 23 are both long bar-shaped, the length of the first fixed beam is the same as the distance between the two cross beams 21, and the two ends of the first fixed beam 22 and the second fixed beam 23 are both welded and fixed between the two cross beams 21.

The second fixed beam 23 is located between the first fixed beam 22 and the blank column 1.

The support 2 further comprises a fixing bar 27 located below the cross beam 21 and perpendicular to the cross beam 21. The fixing rods 27 are in the shape of long bars, and the number of the fixing rods is two. One fixing bar 27 is provided at an end of the cross beam 21 near the first sliding beam 24, and the other fixing bar 27 is located between the second sliding beam 25 and the second fixing beam 23.

This workstation of blank post of polishing still includes removal subassembly 3. The moving assembly 3 includes a lead screw 32 and a connecting plate 33.

The screw rods 32 are in the form of long rods, one in number, and are disposed horizontally and parallel to the cross beam 21. The lead screw 32 passes through the two fixing rods 27 and is rotatably connected with the two fixing rods 27. One end of the screw 32 close to the first sliding beam 24 is fixedly connected with a hand wheel 31 after passing through the fixed rod 27.

The number of the hand wheels 31 is one, so that a worker can conveniently hold and apply force to drive the screw rod 32 to rotate.

As shown in fig. 2, a locknut 321 is screwed on the shaft section of the screw 32 near the first fixing beam 22 after passing through the fixing rod 27, so as to prevent the screw 32 from slipping off between the two fixing rods 27 during the rotation.

A washer 322 is further sleeved on the screw rod between the locknut 321 and the fixing rod 27 to prevent the screw rod 32 from driving the locknut 321 to rotate so as to cause friction between the locknut 321 and the fixing rod 27.

The connecting plates 33 are plate-shaped, and the number of the connecting plates 33 is two, wherein one connecting plate 33 is vertically arranged on one side of the first sliding beam 24 away from the second sliding beam 25, and the other connecting plate 33 is vertically fixed on one side of the second sliding beam 25 away from the first sliding beam 24. While the faces of the two connecting plates 33 are perpendicular to the screw 32. The screw shaft 32 penetrates the two connecting plates 33 and is in threaded connection with the two connecting plates 33.

A collar 331 is arranged on the connecting plate 33 perpendicular to the plate surface and is in threaded connection with the screw rod 32, and the collar 331 is used for increasing the contact area of the threaded connection between the connecting plate 33 and the screw rod 32.

The moving assembly 3 further comprises a first fixed abutment 34 and a second fixed abutment 35.

The number of the first fixing brackets 34 is two, and the first fixing brackets are fixed to the midpoint positions in the longitudinal direction of the first sliding beam 24 and the first fixing beam 22, respectively.

The number of the second fixing brackets 35 is two, and the second fixing brackets are fixed to the second sliding beam 25 and the second fixing beam 23 at the midpoint in the longitudinal direction. The manner of the fixed connection depends on the actual situation, here a bolt connection.

The axes of the two first fixed seats 34 and the two second fixed seats 35 both coincide.

The workbench for polishing the blank column further comprises a clamping assembly 4 for clamping the blank column 1 and a power assembly 5 for driving the blank column 1 to rotate.

The clamp assembly 4 includes a driving clamp body 41 and a driven clamp body 42. The number of the active clamp bodies 41 is one, and the active clamp bodies include an active rotating shaft 411 and an active clamp base 414.

The driving rotating shaft 411 is long and has a number of one, and one end departing from the blank column 1 is rotatably connected to the first fixing support 34 on the first fixing beam 22 through a bearing.

The driving shaft 411 passes through the second fixed support 35 on the second fixed beam 23 and is rotatably connected with the second fixed support 35.

As shown in fig. 3, the driving shaft 411 is further provided with a first positioning shoulder 413. The first positioning shoulder 413 is circular truncated cone-shaped, and the end with the larger diameter faces the second fixed beam 23.

When the driving shaft 411 receives an axial force, the first positioning shoulder 413 abuts against the second fixing support 35 on the second fixing beam 23, so that the axial force of the driving shaft 411 is prevented from acting on the rotating connection position of the driving shaft 411 and the first fixing support 34 and the second fixing support 35.

As shown in fig. 2, an end of the driving shaft 411 facing the blank column 1 is provided with a driving clamp base 414. The active clamp bases 414 are plate-shaped, one in number, and are vertically arranged, and have the same size and shape as the base 11. And the active clamp base 414 is attached to the bottom surface of the base 11.

As shown in fig. 2 and fig. 3, two active limiting pieces 4141 are further disposed at diagonal positions of the active clamp base 414. The active limiting piece 4141 is perpendicular to the active clamp base 414 and located on the side of the active clamp base 414 facing the blank column 1.

The active limit piece 4141 is attached to the top of the base 11 and abuts against two side surfaces of the base 11 at the same time, and the length of the active limit piece 4141 in the length direction of the side surface of the base 11 is less than half of the length of the side surface of the base 11. So that the two active limiting pieces 4141 are abutted against the four side surfaces of the base 11.

The driving fixture body 41 further includes a belt pulley 412 coaxially and fixedly connected to the driving shaft 411, and the belt pulley 412 rotates along its axis to drive the driving shaft 411 to rotate.

The driven clamp body 42 is one in number, has a structure similar to that of the driving clamp body 41, and includes a driven rotation shaft 421 and a driven clamp base 423. The driven rotating shaft 421 is provided with a second positioning shaft shoulder 422, and the driven clamp base 423 is provided with a driven limit piece 4231.

The larger diameter end of the second locating shoulder 422 faces away from the blank column 1 toward the second fixed abutment 35 on the second sliding beam 25. Other structures and functions of the driven clamp body 42 are similar to those of the driving clamp body 41, and thus are not described in detail herein.

As shown in fig. 2, the power assembly 5 includes a driving member 51 and a belt 52.

The number of the driving members 51 is one, and the corresponding equipment can be selected according to actual working conditions, and the driving members can be motors.

The belt 52 is one in number, and is wound around the output shaft of the driving member 51 and the pulley 412, and transmits the power of the driving member 51 to the driving shaft 411 through belt transmission.

The utility model discloses a theory of operation:

after the green pillar 1 is removed from the mold, it is placed between the driving jig base 414 and the driven jig base 423 in order to remove burrs from the surface thereof. The worker may then drive the lead screw 32 to rotate by turning the hand wheel 31. Since the connecting plate 33 and the collar 331 are threadedly connected to the lead screw 32, rotation of the lead screw 32 will drive the connecting plate 33 to reciprocate along the axis of the lead screw 32. Since the connecting plate 33 is fixedly connected with the first sliding beam 24 and the second sliding beam 25, the first sliding beam 24 and the second sliding beam 25 will reciprocate along the sliding groove 211 in the axial direction of the blank column 1;

after the blank column 1 is loaded between the driving clamp base 414 and the driven clamp base 423, the first sliding beam 24 and the second sliding beam 25 move towards the blank column 1, so that the driven rotating shaft 421 pushes the driven clamp base 423 to be attached to the bottom surface of the blank column 1, thereby axially clamping the blank column 1;

meanwhile, the driving limiting piece 4141 on the driving clamp base 414 and the driven limiting piece 4231 on the driven clamp base 423 are abutted against the side surface of the base 11 of the blank column 1 to provide radial support for the blank column 1, so that the clamping assembly 4 can clamp the blank column 1 more stably and reliably, and accidents caused by slipping of the blank column 1 due to insufficient axial clamping force in the process of rotating around the axis of the blank column 1 are avoided;

after the installation of blank post 1 is accomplished, workman can start driving piece 51, and it is rotatory around self axis to drive initiative pivot 411 through the belt drive, and then drives blank post 1 rotatory, is convenient for the workman to clear up the burr on blank post 1 surface fast. After cleaning, the hand wheel 31 is rotated to move the first sliding beam 24 and the second sliding beam 25 towards the direction far away from the blank column 1, so that the polished blank column 1 can be taken down, and the above process is repeated to polish a plurality of blank columns 1.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims (8)

1. An operating platform for polishing a blank column comprises a clamping component (4) and a power component (5), the two ends of the blank column (1) are rectangular bases (11), the clamping component (4) axially clamps the blank column (1), the axis of the clamping component (4) is superposed with the axis of the blank column (1), the power component (5) drives the clamping component (4) to rotate around the axis of the power component, characterized in that the clamping assembly (4) comprises a driving clamp base (414) and a driven clamp base (423) which are perpendicular to the axis of the blank column (1), the driven clamp base (423) moves along the axis of the blank column (1), the driving clamp base (414) and the driven clamp base (423) are provided with limiting pieces (4141, 4231), the limiting pieces (4141, 4231) are perpendicular to the driving clamp base (414) and the driven clamp base (423) and abut against four side faces of the base (11).

2. The workbench according to claim 1, wherein the limiting pieces (4141, 4231) are attached to the top of the base (11) and contact with two side surfaces of the base (11), and the length of the limiting pieces (4141, 4231) in the length direction of the side surfaces of the base (11) is less than half of the length of the side surfaces of the base (11).

3. A station for grinding columns of blanks as in claim 2, wherein said stop tabs (4141, 4231) are symmetrically arranged about the center of rotation of the driving chuck base (414) and the driven chuck base (423).

4. A station for grinding columns of blanks as in claim 1, further comprising a support (2), the bracket (2) comprises a first fixed beam (22), a second fixed beam (23), a first sliding beam (24) and a second sliding beam (25), the clamping assembly (4) also comprises a driving rotating shaft (411) and a driven rotating shaft (421), one end of the driving rotating shaft (411) far away from the blank column (1) is rotatably connected with the first fixed beam (22), one end of the driven rotating shaft (421) far away from the blank column (1) is rotatably connected with the first sliding beam (24), the second fixed beam (23) is rotationally connected with the blank column (1) and is positioned between the blank column (1) and the first fixed beam (22), the second sliding beam (25) is rotatably connected with the blank column (1) and is positioned between the blank column (1) and the first sliding beam (24).

5. A workbench according to claim 4, characterized in that the driving rotary shaft (411) is provided with a first positioning shoulder (413) on the side of the second fixed beam (23) facing the blank column (1), and the driven rotary shaft (421) is provided with a second positioning shoulder (422) on the side of the second sliding beam (25) facing the blank column (1).

6. A bench for grinding columns of blanks as claimed in claim 4, further comprising a moving assembly (3), said moving assembly (3) comprising a threaded spindle (32), said threaded spindle (32) being rotatably connected to the first sliding beam (24) and the second sliding beam (25).

7. A worktable for grinding columns of blanks as claimed in claim 6, wherein the moving assembly (3) further comprises a hand wheel (31), the hand wheel (31) driving a lead screw (32) to rotate.

8. A worktable for grinding columns of blanks as claimed in claim 6, wherein the moving assembly (3) further comprises a fixedly connected connecting plate (33) and a collar (331), the lead screw (32) passes through the connecting plate (33) and the collar (331) and is in threaded connection with the connecting plate (33) and the collar (331), the connecting plates (33) are two in number and are fixedly connected with the first sliding beam (24) and the second sliding beam (25) respectively, and the connecting plate (33) on the second sliding beam (25) is positioned on the second sliding beam (25) towards one side of the columns of blanks (1).

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