CN217702864U

CN217702864U - Assembled building externally-hung wallboard grinding device

Info

Publication number: CN217702864U
Application number: CN202222568158.1U
Authority: CN
Inventors: 李建广; 雷明拯; 郑虎; 雷艳; 扈晓天
Original assignee: China Northwest Architecture Design and Research Institute Co Ltd
Current assignee: China Northwest Architecture Design and Research Institute Co Ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2022-11-01
Anticipated expiration: 2032-09-28

Abstract

The application discloses an assembled building external wall panel polishing device which comprises a lower base, wherein a plurality of supporting rollers are arranged on the lower base; the clamping frame comprises a bottom plate, a fixed side plate, a movable side plate and a top plate; the lower surface of the bottom plate is provided with a sliding chute which is matched with the supporting roller; the lower end of the fixed side plate is fixedly connected to the upper surface of the bottom plate, and the upper end of the fixed side plate is fixedly connected to the lower surface of the top plate; the lower end of the movable side plate is detachably connected to the upper surface of the bottom plate, and the upper end of the movable side plate is detachably connected to the lower surface of the top plate; the bottom plate, the fixed side plate, the movable side plate and the top plate are respectively used for clamping four side walls of the external hanging wallboard; the two sides of the lower base are provided with polishing rollers, the polishing rollers are positioned in the middle of the lower base, and the clamping frame is positioned between the polishing rollers on the two sides. The utility model provides a maintenance device that polishes among the prior art fix its centre gripping through the surface of externally-hung wallboard both sides, and need the problem that the secondary was polished.

Description

Assembled building externally-hung wallboard grinding device

Technical Field

The application belongs to the technical field of the grinding, concretely relates to assembled building external wallboard grinding device.

Background

The fabricated building is a building which is fabricated by transferring a large amount of field operation work in the traditional construction mode to a factory, processing and manufacturing building components and accessories in the factory, transporting the components and accessories to a building construction site, and assembling and installing the components and accessories on the site in a reliable connection mode. The external wallboard is an assembly type building material which is frequently used, the external wallboard is convenient to mount and dismount, the dismounted external wallboard can be reused after being polished and maintained, and sundries attached to the surface of the external wallboard need to be polished and cleaned up when the external wallboard is polished and maintained, so that the surface of the external wallboard is kept clean and flat.

The external wall panel needs to be clamped and fixed during grinding and maintenance, but the clamping mode of the existing device for clamping the external wall panel is to clamp the grinding surfaces on two sides of the external wall panel, so that after the external wall panel is ground, the clamping position needs to be ground for the second time, and the grinding efficiency is low.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an assembly type structure externally-hanging wallboard grinding device, and the problem that the grinding maintenance device in the prior art needs secondary grinding through the surface of the two sides of the externally-hanging wallboard to fix the clamping of the externally-hanging wallboard.

In order to achieve the purpose, the embodiment of the utility model provides an assembly type building external wall panel polishing device, which comprises a lower base, a supporting roller, a clamping frame and a polishing roller;

the lower base is provided with a plurality of supporting rollers which are arranged at intervals along the length direction of the lower base;

the clamping frame comprises a bottom plate, a fixed side plate, a movable side plate and a top plate;

the lower surface of the bottom plate is provided with a sliding chute which is matched with the supporting roller;

the lower end of the fixed side plate is fixedly connected to the upper surface of the bottom plate, and the upper end of the fixed side plate is fixedly connected to the lower surface of the top plate;

the lower end of the movable side plate is detachably connected to the upper surface of the bottom plate, and the upper end of the movable side plate is detachably connected to the lower surface of the top plate;

the bottom plate, the fixed side plate, the movable side plate and the top plate are respectively used for clamping four side walls of an external wall panel;

the grinding rollers are arranged on two sides of the lower base, the grinding rollers are located in the middle of the lower base, and the clamping frame is located between the grinding rollers on the two sides.

In a possible implementation manner, a supporting frame is arranged on the lower base, and the supporting frame comprises an upper base and upright columns arranged at four corners of the lower base; the upper end and the lower end of the upright post are respectively connected with the upper base and the lower base;

go up the middle part of base and be provided with the bar hole on its length direction, the downthehole slip of bar is provided with the gag lever post, the lower extreme of gag lever post connect in the upper surface of roof.

In a possible implementation manner, the lower end of the grinding roller is rotatably mounted on a sliding seat, the sliding seat is slidably mounted on the lower base, and the sliding direction of the sliding seat is perpendicular to the length direction of the lower base; the upper end of the grinding roller penetrates through the upper base and then is connected to an output shaft of the motor, and the motor is slidably mounted on the upper base.

In one possible implementation manner, the fixed side plate and the movable side plate are both of a telescopic structure.

In a possible implementation manner, an upper pressing plate is arranged on the lower surface of the top plate, the upper pressing plate is located between the fixed side plate and the movable side plate, and the top plate is connected with the upper pressing plate through a compression spring.

In a possible implementation manner, a side pressing plate is arranged on one side of the movable side plate facing the fixed side plate, the side pressing plate is located between the bottom plate and the top plate, and the movable side plate and the side pressing plate are connected through a compression spring.

In one possible implementation, the widths of the supporting rollers, the bottom plate, the fixed side plate, the movable side plate and the top plate are all smaller than the thickness of the external hanging wall plate.

In a possible implementation manner, a connecting seat is arranged at the lower end of the movable side plate, and a threaded hole is formed in the connecting seat;

the clamping groove is formed in the center of the sliding groove of the bottom plate, the long hole is formed in the center of the clamping groove, the end portion of the bolt penetrates through the long hole and then is screwed into the threaded hole, and the bolt head of the bolt is located in the clamping groove.

In one possible implementation, the maximum extension length of the fixed side plate and the movable side plate is smaller than the length of the grinding roller.

The embodiment of the utility model provides an in one or more technical scheme, following technological effect or advantage have at least:

the embodiment of the utility model provides an assembly type structure externally-hanging wallboard grinding device, the device when using, dismantle movable curb plate, insert the opening frame that bottom plate, fixed curb plate and roof formed with externally-hanging wallboard in, make one side and the fixed curb plate butt of externally-hanging wallboard, the upper and lower end of externally-hanging wallboard respectively with bottom plate and roof butt, then installation activity curb plate, and then it is fixed through pressing from both sides tight frame to make externally-hanging wallboard. The clamping frame is adjusted to be in the position of the lower base, so that the two sides of the end portion of the external wall board are in contact with the polishing rollers on the two sides respectively, then the polishing rollers are controlled to rotate, the clamping frame is moved in the process of polishing the external wall board, the bottom plate slides on the supporting rollers, and then the surfaces of the two sides of the external wall board are polished completely through the polishing rollers on the two sides. The utility model discloses a device adopts the fixed externally-hanging wallboard of the tight frame of clamp for the surface of externally-hanging wallboard both sides can expose completely on the grinding roller, and then once only just can polish totally with the surface of externally-hanging wallboard both sides, and it is fixed with its centre gripping to have avoided the surface that current grinding device passes through the externally-hanging wallboard both sides, and needs the problem that the secondary was polished, therefore the device has improved the efficiency of polishing, the device simple structure, and the practicality is strong.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some of the embodiments described in the present application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is the embodiment of the utility model provides an assembly type structure externally-hung wallboard grinding device's structural schematic diagram.

Fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 1.

Fig. 3 is a schematic connection diagram of the connection seat, the bottom plate and the support roller according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of the clamping frame after sliding according to the embodiment of the present invention.

Fig. 5 is a schematic structural view of the external wall panel provided by the embodiment of the present invention.

Fig. 6 is a right side view of fig. 5.

Fig. 7 is a schematic view of a state of the clamping frame for fixing the external wall panel according to the embodiment of the present invention.

Fig. 8 is the embodiment of the utility model provides a state schematic diagram when assembled building externally-hung wallboard grinding device polishes externally-hung wallboard.

Fig. 9 is an installation schematic diagram of the upper compression plate and the side compression plate provided by the embodiment of the present invention.

Reference numerals: 1-a lower base; 2-supporting the roller; 3-clamping the frame; 31-a base plate; 32-fixed side plates; 33-a movable side plate; 34-a top plate; 35-a chute; 36-a connecting seat; 37-a clamping groove; 38-elongated holes; 39-bolt; 4, grinding the roller; 5-external wall panel; 6-a support frame; 61-an upper base; 62-upright post; 63-strip-shaped holes; 64-a limiting rod; 7-a slide seat; 8, a motor; 9-upper pressing plate; 10-side compression plates; 11-a slide rail; 12-a sliding post; 13-a first spring; 14-second spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description and simplification of the description of the embodiments of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

As shown in figures 1 to 9, the embodiment of the utility model provides an assembled building external wallboard grinding device, including lower base 1, supporting roller 2, clamping frame 3 and grinding roller 4.

A plurality of supporting rollers 2 are arranged on the lower base 1, and the plurality of supporting rollers 2 are arranged at intervals along the length direction of the lower base 1.

The clamping frame 3 includes a bottom plate 31, a fixed side plate 32, a movable side plate 33, and a top plate 34.

The lower surface of the bottom plate 31 is provided with a sliding groove 35, and the sliding groove 35 is matched with the supporting roller 2.

The lower end of the fixed side plate 32 is fixedly connected to the upper surface of the bottom plate 31, and the upper end of the fixed side plate 32 is fixedly connected to the lower surface of the top plate 34.

The lower end of the movable side plate 33 is detachably connected to the upper surface of the bottom plate 31, and the upper end of the movable side plate 33 is detachably connected to the lower surface of the top plate 34.

The bottom plate 31, the fixed side plate 32, the movable side plate 33, and the top plate 34 are used to clamp four side walls of the external wall panel 5, respectively.

Two sides of the lower base 1 are provided with grinding rollers 4, the grinding rollers 4 are positioned in the middle of the lower base 1, and the clamping frame 3 is positioned between the grinding rollers 4 on the two sides.

When the external wall panel 5 needs to be maintained, the movable side plate 33 is detached, the external wall panel 5 is inserted into the open frame formed by the bottom plate 31, the fixed side plate 32 and the top plate 34, so that one side of the external wall panel 5 abuts against the fixed side plate 32, the upper end and the lower end of the external wall panel 5 abut against the bottom plate 31 and the top plate 34 respectively, and then the movable side plate 33 is installed, so that the external wall panel 5 is fixed by the clamping frame 3. The position of the clamping frame 3 on the lower base 1 is adjusted to enable two sides of the end portion of the external wall board 5 to be in contact with the polishing rollers 4 on two sides respectively, then the polishing rollers 4 are controlled to rotate, the clamping frame 3 is moved in the process of polishing the external wall board 5 through the polishing rollers 4, the bottom plate 31 slides on the supporting rollers 2, and then the surfaces of the two sides of the external wall board 5 are polished completely through the polishing rollers 4 on the two sides. The grinding roller 4 can be made of metal wire bristles, heating wires such as infrared heating wires can be arranged inside the grinding roller 4 and can be used for heating the metal wire bristles, and therefore attachments on the surface of the external wall board 5 can be better cleaned. The utility model discloses still can adopt electric drive arrangement to remove clamping frame 3, and then reduce staff's work load. The utility model discloses a device adopts the fixed externally-hanging wallboard 5 of clamping frame 3 for the surface of 5 both sides of externally-hanging wallboard can expose completely on the grinding roller 4, and then once only just can polish totally with the surface of 5 both sides of externally-hanging wallboard, and it is fixed to have avoided current grinding device to pass through the surperficial centre gripping of 5 both sides of externally-hanging wallboard, and has the problem that needs the secondary to polish, therefore the device has improved the efficiency of polishing, the device simple structure, and the practicality is strong.

In this embodiment, the lower base 1 is provided with a supporting frame 6, and the supporting frame 6 includes an upper base 61 and upright posts 62 arranged at four corners of the lower base 1. The upper and lower ends of the pillar 62 are connected to the upper and

lower bases

61 and 1, respectively.

The middle part of the upper base 61 is provided with a strip-shaped hole 63 along the length direction, a limiting rod 64 is arranged in the strip-shaped hole 63 in a sliding manner, and the lower end of the limiting rod 64 is connected to the upper surface of the top plate 34.

It should be noted that, when the clamping frame 3 slides on the supporting roller 2, the limiting rod 64 slides in the strip-shaped hole 63, and the clamping frame 3 and the external wall panel 5 can always keep a vertical state under the action of the limiting rod 64, so as to prevent the lateral turning.

In this embodiment, the lower end of the polishing roller 4 is rotatably mounted on the sliding base 7, the sliding base 7 is slidably mounted on the lower base 1, and the sliding direction of the sliding base 7 is perpendicular to the length direction of the lower base 1. The upper end of the grinding roller 4 is connected to the output shaft of the motor 8 after penetrating through the upper base 61, and the motor 8 is slidably mounted on the upper base 61.

It should be noted that the lower end of the polishing roller 4 is rotatably mounted on the sliding base 7, and the motor 8 is slidably mounted on the upper base 61, so that the polishing roller 4 can slide along the width direction of the lower base 1, and further meets the polishing requirements of the external wall-hung panels 5 with different thicknesses, after the position of the polishing roller 4 is adjusted, the sliding base 7 is relatively fixed with the lower base 1 through a locking device, the upper end of the polishing roller 4 and the upper base 61 are relatively fixed through a locking mechanism, and the locking device and the locking mechanism are both in the prior art, and are not described herein again.

In the embodiment, as shown in fig. 2, the sliding base 7 is slidably mounted in a sliding rail 11 on the lower base 1, a first spring 13 is disposed between the sliding base 7 and one end inside the sliding rail 11, and the first spring 13 is located on a side of the sliding base 7 away from the clamping frame 3. The locking device is a first locking bolt arranged in the sliding rail, the first locking bolt is abutted to one side of the sliding seat 7, and the first locking bolt and the first spring 13 are respectively located on two sides of the sliding seat 7.

The upper end of the grinding roller 4 penetrates through the sliding column 12 in the upper base 61, the sliding column 12 is located in the long circular hole in the upper base 61, a second spring 14 is arranged between the sliding column 12 and one end of the inner portion of the strip-shaped hole 63, and the second spring 14 is located on one side, away from the clamping frame 3, of the sliding column 12. The locking mechanism is a second locking bolt arranged on one side of the upper base 61, the end part of the second locking bolt is abutted against one side of the sliding column 12, and the second locking bolt and the second spring 14 are respectively positioned on two sides of the sliding seat 7.

It should be noted that after the position of the polishing roller 4 is adjusted, the polishing roller 4 can move to a side far away from the external wall panel 5, and the polishing roller 4 can act on the external wall panel 5 under the action of the first spring 13 and the second spring 14 with a set pressure to realize polishing operation, thereby realizing different polishing force.

In this embodiment, the fixed side plate 32 and the movable side plate 33 are both telescopic structures.

It should be noted that the fixed side plate 32 and the movable side plate 33 of the telescopic structure can fix the external wall panels 5 with different heights, so as to meet the polishing requirements of the external wall panels 5 with various specifications. The fixed side plate 32 and the movable side plate 33 can both adopt an outer tube and an inner rod structure which are connected in a sleeved mode, and the outer tube and the inner rod are fixed through locking bolts.

As shown in fig. 9, in the present embodiment, the lower surface of the top plate 34 is provided with the upper pressing plate 9, the upper pressing plate 9 is located between the fixed side plate 32 and the movable side plate 33, and the top plate 34 and the upper pressing plate 9 are connected by a compression spring.

It should be noted that, after the movable side plate 33 is detached, the top plate 34 and the upper pressing plate 9 are moved close to each other, the compression spring is contracted, and then the external wall panel 5 is inserted into the opening frame formed by the bottom plate 31, the fixed side plate 32 and the top plate 34, and at this time, the external wall panel 5 is firmly clamped by the upper pressing plate 9 under the action of the compression spring, so that the fixing effect is improved, and the external wall panel 5 is prevented from loosening.

In this embodiment, the movable side plate 33 is provided with a side pressing plate 10 on the side facing the fixed side plate 32, the side pressing plate 10 is located between the bottom plate 31 and the top plate 34, and the movable side plate 33 and the side pressing plate 10 are connected by a compression spring.

After the external wall panel 5 is inserted into the opening frame formed by the bottom plate 31, the fixed side plate 32 and the top plate 34, the movable side plate 33 is installed and installed, and the movable side plate 33 and the side pressing plate 10 are close to each other, at this time, the compression spring contracts, and the side pressing plate 10 firmly clamps the external wall panel 5 under the action of the compression spring, thereby further improving the fixing effect.

In this embodiment, the widths of the supporting rollers 2, the bottom plate 31, the fixed side plate 32, the movable side plate 33, and the top plate 34 are all smaller than the thickness of the external wall panel 5.

It should be noted that such a sub-arrangement can prevent the backup roller 2, the bottom plate 31, the fixed side plate 32, the movable side plate 33, and the top plate 34 from interfering with the polishing roller 4, thereby ensuring smooth progress of the polishing process.

As shown in fig. 5 and 6, the end face of a part of the external wall panel 5 is provided with a connector for installing the external wall panel 5, so that the width of the support roller 2, the bottom plate 31, the fixed side plate 32, the movable side plate 33 and the top plate 34 is set to be a smaller value, the connector does not affect the normal fixation of the external wall panel 5, and the device is suitable for the fixation of external wall panels 5 of various types, and the effect after the fixation is shown in fig. 7 and 8.

As shown in fig. 3, in the present embodiment, the lower end of the movable side plate 33 is provided with a connecting seat 36, and the connecting seat 36 is provided with a threaded hole.

A clamping groove 37 is formed in the center of the sliding groove 35 of the bottom plate 31, a long hole 38 is formed in the center of the clamping groove 37, the end portion of a bolt 39 penetrates through the long hole 38 and then is screwed into the threaded hole, and the bolt head is located in the clamping groove 37.

It should be noted that the upper end of the movable side plate 33 is provided with a connecting seat 36, and the connecting seat 36 is provided with a threaded hole. The center of the lower surface of the top plate 34 is provided with a clamping groove 37, the center of the clamping groove 37 is provided with a long hole 38, the end part of the bolt 39 passes through the long hole 38 and then is screwed into the threaded hole, and the bolt head of the bolt 39 is positioned in the clamping groove 37.

The connection mode of the upper end and the lower end of the movable side plate 33 is the same, more than two bolts 39 are corresponding to each connecting seat 36, and the bolts 39 can be hexagon socket head cap bolts.

The connecting seat 36 of the movable side plate 33 can be connected to different positions of the bottom plate 31 and the top plate 34, so that the clamping frame 3 forms clamping spaces with different widths, and the polishing requirements of the external wall panels 5 with various widths can be met.

As shown in fig. 8, in the present embodiment, the maximum extension length of the fixed side plate 32 and the movable side plate 33 is smaller than the length of the grinding roller 4.

It should be noted that, this arrangement enables the grinding roller 4 to grind the side of the external wall panel 5 in place at one time after the length of the fixed side plate 32 and the movable side plate 33 is adjusted.

In the present embodiment, it is apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The utility model provides an assembly type structure externally-hung wallboard grinding device which characterized in that: comprises a lower base (1), a supporting roller (2), a clamping frame (3) and a grinding roller (4);

the lower base (1) is provided with a plurality of supporting rollers (2), and the supporting rollers (2) are arranged at intervals along the length direction of the lower base (1);

the clamping frame (3) comprises a bottom plate (31), a fixed side plate (32), a movable side plate (33) and a top plate (34);

the lower surface of the bottom plate (31) is provided with a sliding groove (35), and the sliding groove (35) is matched with the supporting roller (2);

the lower end of the fixed side plate (32) is fixedly connected to the upper surface of the bottom plate (31), and the upper end of the fixed side plate (32) is fixedly connected to the lower surface of the top plate (34);

the lower end of the movable side plate (33) is detachably connected to the upper surface of the bottom plate (31), and the upper end of the movable side plate (33) is detachably connected to the lower surface of the top plate (34);

the bottom plate (31), the fixed side plate (32), the movable side plate (33) and the top plate (34) are respectively used for clamping four side walls of the external wall panel (5);

the grinding roller (4) is arranged on two sides of the lower base (1), the grinding roller (4) is located in the middle of the lower base (1), and the clamping frame (3) is located between the grinding rollers (4) on two sides.

2. The assembly type building external wall panel grinding device of claim 1, wherein: a supporting frame (6) is arranged on the lower base (1), and the supporting frame (6) comprises an upper base (61) and upright posts (62) arranged at four corners of the lower base (1); the upper end and the lower end of the upright post (62) are respectively connected with the upper base (61) and the lower base (1);

the middle part of going up base (61) is provided with bar hole (63) along its length direction, it is provided with gag lever post (64) to slide in bar hole (63), the lower extreme of gag lever post (64) connect in the upper surface of roof (34).

3. The assembly type building exterior wallboard grinding device of claim 2, wherein: the lower end of the grinding roller (4) is rotatably arranged on a sliding seat (7), the sliding seat (7) is slidably arranged on the lower base (1), and the sliding direction of the sliding seat (7) is vertical to the length direction of the lower base (1); the upper end of the grinding roller (4) penetrates through the upper base (61) and then is connected to an output shaft of the motor (8), and the motor (8) is installed on the upper base (61) in a sliding mode.

4. The assembly type building external wall panel grinding device of claim 1, wherein: the fixed side plate (32) and the movable side plate (33) are both of telescopic structures.

5. The assembly type building exterior wallboard grinding device of claim 1, wherein: the lower surface of the top plate (34) is provided with an upper pressure plate (9), the upper pressure plate (9) is positioned between the fixed side plate (32) and the movable side plate (33), and the top plate (34) is connected with the upper pressure plate (9) through a compression spring.

6. The assembly type building exterior wallboard grinding device of claim 5, wherein: one side of the movable side plate (33) facing the fixed side plate (32) is provided with a side pressing plate (10), the side pressing plate (10) is located between the bottom plate (31) and the top plate (34), and the movable side plate (33) is connected with the side pressing plate (10) through a compression spring.

7. The assembly type building external wall panel grinding device of claim 1, wherein: the widths of the supporting rollers (2), the bottom plate (31), the fixed side plate (32), the movable side plate (33) and the top plate (34) are all smaller than the thickness of the external wall-hung plate (5).

8. The assembly type building exterior wallboard grinding device of claim 1, wherein: the lower end of the movable side plate (33) is provided with a connecting seat (36), and a threaded hole is formed in the connecting seat (36);

a clamping groove (37) is formed in the center of a sliding groove (35) of the bottom plate (31), a long hole (38) is formed in the center of the clamping groove (37), the end portion of a bolt (39) penetrates through the long hole (38) and then is screwed into the threaded hole, and the bolt head of the bolt (39) is located in the clamping groove (37).

9. The assembly type building exterior wallboard grinding device of claim 4, wherein: the maximum extension length of the fixed side plate (32) and the movable side plate (33) is less than the length of the grinding roller (4).