CN109290395B

CN109290395B - Plate leveling machine

Info

Publication number: CN109290395B
Application number: CN201811121243.5A
Authority: CN
Inventors: 王敏侠
Original assignee: Anhui Saiwang Trading Co Ltd
Current assignee: Anhui saiwang Trading Co., Ltd
Priority date: 2018-09-26
Filing date: 2018-09-26
Publication date: 2020-11-24
Anticipated expiration: 2038-09-26
Also published as: CN109290395A

Abstract

The invention belongs to the technical field of metal plate production, and particularly relates to a plate flattening machine which comprises a controller, a support, driving rollers, a flattening unit, a sliding shaft and a transmission chain, wherein one side of the support is provided with a group of driving rollers, the other side of the support is provided with the flattening unit, and the flattening unit is used for flattening plates; the controller is arranged on the bracket and used for controlling the driving roller to rotate, and the driving roller is rotationally arranged on the bracket through the sliding shaft; the leveling unit comprises a hollow shaft and a leveling roller, and the driving roller drives the leveling roller through a transmission chain; the leveling rollers are arranged up and down symmetrically, and the cross sections of the leveling rollers are in a bottleneck shape; annular rubber sheets are arranged on the outer rings of the leveling rollers; according to the invention, the leveling rollers are arranged in a group, the outer ring of one leveling roller is convex, the outer ring of the other leveling roller is concave, and the two leveling rollers are matched with the middle convex sheet to level, so that springback is avoided and the leveling effect is improved.

Description

Plate leveling machine

Technical Field

The invention belongs to the technical field of metal plate production, and particularly relates to a plate flattening machine.

Background

The leveling machine extrudes a strip or a plate with certain thickness from an uneven metal plate through an upper roller and a lower roller, thereby achieving the leveling effect. Before the metal plate is subjected to the shearing process, the metal plate must be leveled. The leveling machine mainly levels through an upper leveling roller set and a lower leveling roller set. Among the current evener, generally use two sets of flattening rollers, though can flattening sheet metal to a certain extent, it generally only is applicable to thicker sheet metal, to the sheet metal, especially the bellied sheet metal in middle part, rebound can appear in the middle part after general evener carries out the flattening to the sheet metal, consequently the sheet metal need through multiunit flattening roller flattening, the effect of wasting time and energy and flattening is difficult to reach, consequently remains to improve.

Some leveling machines have been proposed in the prior art, for example, a chinese patent with application number 2011103347528 discloses a leveling machine, which includes an upper roller and more than two lower rollers rotatably mounted on a frame, wherein the upper roller is above two adjacent lower rollers, and the upper and lower rollers are parallel; the upper and lower rollers are tangent with the leveled plate passing through the space between the upper and lower rollers; the upper and lower rollers are connected with a chain transmission mechanism which drives the upper and lower rollers to synchronously rotate.

This technical scheme, simple structure, and can the efficient evener to the panel flattening. But among this technical scheme to the sheet metal middle part can appear kick-backing after the flattening, cause the flattening effect not good for this scheme receives the restriction.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides a plate leveling machine, and mainly aims to solve the problems that after a thin plate with a convex middle part is leveled, springback is easy to generate and the leveling effect is poor. The controller controls the driving roller to rotate, the thin plate protruding in the middle part is pushed to move horizontally while being leveled, the drive roller drives the leveling roller to rotate through the transmission chain while rotating, an external air source inflates the upper leveling roller cavity through the hollow shaft and the through hole, so that the air pressure in the upper leveling roller cavity is increased, and the rubber sheet elastically deforms and protrudes outwards under the action of the pressure; the extraction is located the gaseous in the flattening roller cavity of below simultaneously for the flattening roller cavity of below forms the negative pressure, and the sheet rubber is adsorbed on the outer lane of the flattening roller of bottleneck type form of below, makes the flattening roller outer lane of below inwards sunken, and under the cooperation pressfitting of two flattening rollers this moment, the bellied sheet metal of centering portion carries out the flattening, avoids leading to the flattening effect not good because of resilience behind the bellied sheet metal flattening of middle part, thereby improve the flattening effect and the flattening efficiency of the bellied sheet metal of centering portion of device.

The technical scheme adopted by the invention for solving the technical problems is as follows: a plate flattening machine comprises a controller, a support, driving rollers, a flattening unit, a sliding shaft and a transmission chain, wherein one side of the support is provided with a group of driving rollers, the other side of the support is provided with the flattening unit, and the flattening unit is used for flattening plates; the controller is arranged on the bracket and used for controlling the driving roller to rotate, and the driving roller is rotationally arranged on the bracket through the sliding shaft; the leveling unit comprises a hollow shaft and a leveling roller, and the driving roller drives the leveling roller through a transmission chain; the leveling rollers are arranged up and down symmetrically, the cross sections of the leveling rollers are in a bottleneck shape, and the leveling rollers are rotatably arranged on the support through hollow shafts; annular rubber sheets are arranged on the outer rings of the leveling rollers; the space between the rubber sheet and the leveling roller is a cavity; the cavity of one of the leveling rollers is inflated to make the outer ring of the leveling roller convex; the cavity of the other leveling roller is pumped to make the outer ring of the leveling roller concave; a group of through holes are formed in the leveling roller, and the cavity is communicated with the inner cavity of the hollow shaft through the through holes. When the device works, the controller controls the driving roller to rotate, the sheet with the raised middle part is pushed to move horizontally while being leveled, the leveling roller is driven to rotate by the driving roller while rotating, an external air source inflates the upper leveling roller cavity through the hollow shaft and the through hole, so that the air pressure in the upper leveling roller cavity is increased, and the rubber sheet is elastically deformed and raised outwards under the action of the pressure; the extraction is located the gaseous in the flattening roller cavity of below simultaneously for the flattening roller cavity of below forms the negative pressure, and the sheet rubber is adsorbed on the outer lane of the flattening roller of bottleneck type form of below, makes the flattening roller outer lane of below inwards sunken, and under the cooperation pressfitting of two flattening rollers this moment, the bellied sheet metal of centering portion carries out the flattening, avoids leading to the flattening effect not good because of resilience behind the bellied sheet metal flattening of middle part, thereby improve the flattening effect and the flattening efficiency of the bellied sheet metal of centering portion of device.

Preferably, the thickness of the middle part of the rubber sheet is thinner than that of the edge. The during operation, when the external air supply during aerifing in the cavity of the flattening roller to the top, the cavity internal pressure increase of the flattening roller of top, the sheet rubber takes place elastic deformation under the effect of pressure, and thickness through setting up the sheet rubber middle part is thinner than the thickness at edge for the sheet rubber middle part can be more easy emergence be out of shape, thereby improve the whole work efficiency of flattening unit.

Preferably, a suction device is arranged on one side of the support and is used for communicating the cavities of the two leveling rollers; the suction device comprises two sealing plates, a rubber cylinder, a sliding ring, a sliding block, a guide pillar, a lead screw and a motor, wherein the rubber cylinder is fixedly arranged between the two sealing plates; the rubber cylinder is sleeved with an annular slip ring, and the slip ring can divide the space in the rubber cylinder into an upper air cavity and a lower air cavity; one end of the slip ring is fixedly connected to the sliding block, and the lead screw can drive the sliding block to slide on the guide pillar; the controller controls the motor to rotate, and an output shaft of the motor is connected with the lead screw; one end of the hollow shaft is communicated with one end of an L-shaped hollow connecting rod through a sealing bearing, the other end of one hollow connecting rod extends into the upper air cavity, and the other end of the other hollow connecting rod extends into the lower air cavity; the two hollow connecting rods are fixedly arranged on the bracket through fixing rods. When the leveling unit works, when the leveling unit needs to level a thin plate, the controller controls the motor to rotate, the motor rotates to drive the screw rod to rotate, so that the slider is driven to move up and down along the guide post, the slider moves up and down to drive the sliding ring fixedly connected with the slider to move up and down, the sliding ring moves up and down to extrude the rubber cylinder, so that an upper air cavity and a lower air cavity in the rubber cylinder are compressed, when the sliding ring moves up, the upper air cavity of the rubber cylinder is extruded, after the air in the upper air cavity is compressed, the air is guided into the hollow shaft through the connected hollow connecting rod, and then enters the cavity of the leveling roller above from the through hole, so that the air pressure in the cavity of the leveling roller above is increased, and the rubber; meanwhile, when the slip ring moves upwards to extrude the upper air cavity, negative pressure is formed in the lower air cavity, so that air in the cavity of the lower leveling roller is pumped into the lower air cavity through the connected hollow shaft and the hollow connecting rod, and the outer ring of the lower leveling roller is inwards sunken; the flattening roller above the suction device is inflated and the flattening roller below the suction device is used for sucking air synchronously, so that the working efficiency is improved, the external air source is avoided, and the energy is saved.

Preferably, a supporting unit is arranged above the slip ring and used for assisting in extruding the rubber cylinder; the supporting unit comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the sliding ring, the other end of the first connecting rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the sealing plate. During operation, when the sliding ring moves upwards along with the sliding block, the supporting unit arranged on the sliding ring moves upwards along with the sliding ring, so that the outer ring of the rubber cylinder is extruded in an auxiliary mode through the first connecting rod and the second connecting rod in the supporting unit, the upper air cavity is further compressed, and the suction efficiency of the suction device is improved.

Preferably, the inner ring of the slip ring is provided with an annular arc-shaped bulge. During operation, the sliding ring reciprocates and extrudes the rubber cylinder, and the sliding ring inner circle and the direct contact of rubber cylinder outer lane are protruding through setting up annular arc in the sliding ring inner circle to reduce the outer frictional force of pulley and rubber cylinder, make the sliding ring reciprocate conveniently.

Preferably, the support units are circumferentially arranged in at least six groups. During operation, at least six groups of supporting units are circumferentially arranged, so that the supporting units can extrude the outer ring of the rubber cylinder more uniformly, and the local stress of the outer ring of the rubber cylinder is avoided.

The invention has the following beneficial effects:

1. the controller controls the driving roller to rotate, so that the sheet protruding in the middle part is leveled while the sheet is pushed to move horizontally, and an external air source inflates the cavity of the leveling roller above the leveling roller, so that the leveling roller above the leveling roller protrudes outwards under the action of pressure; the extraction is located the gas in the flattening roller cavity of below simultaneously for the flattening roller outer lane of below is inside sunken, and this moment under the cooperation pressfitting of two flattening rollers, the bellied sheet metal of centering portion carries out the flattening, avoids springing back because of the bellied sheet metal flattening in middle part back and leads to the flattening effect not good, thereby improves the flattening effect and the flattening efficiency of the bellied sheet metal of centering portion of device.

2. According to the invention, the thickness of the middle part of the rubber sheet is set to be thinner than that of the edge, so that the middle part of the rubber sheet can be easily deformed, and the suction device is arranged, when the sliding block moves up and down to drive the sliding ring fixedly connected with the sliding block to move up and down, the sliding ring can extrude the rubber cylinder, so that the upper air cavity and the lower air cavity in the rubber cylinder are compressed and guided into the cavity of the upper leveling roller through the connected hollow connecting rod, and the cavity of the upper leveling roller is protruded outwards under the action of pressure; when the upper air cavity is upwards moved and extruded, negative pressure is formed in the lower air cavity, so that air in the cavity of the leveling roller below is pumped into the lower air cavity through the hollow connecting rod, and the outer ring of the leveling roller below is inwards sunken; the flattening roller above the suction device is inflated and the flattening roller below the suction device is used for sucking air synchronously, so that the working efficiency is improved, the external air source is avoided, and the energy is saved.

3. According to the invention, by arranging the supporting unit, when the sliding ring moves upwards along with the sliding block, the supporting unit arranged on the sliding ring moves upwards along with the sliding block, so that the first connecting rod and the second connecting rod in the supporting unit are pushed to assist in extruding the outer ring of the rubber cylinder, the upper air cavity is further compressed, and the pumping efficiency of the pumping device is further improved; and through set up annular arc arch on the sliding ring inner circle to reduce the outer frictional force of pulley and rubber cylinder, make the sliding ring reciprocate convenient.

Drawings

The invention will be further explained with reference to the drawings.

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

FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at B;

in the figure: the device comprises a support 1, a driving roller 2, a leveling unit 3, a hollow shaft 31, a leveling roller 32, a rubber sheet 4, a cavity 5, a through hole 6, a suction device 7, a sealing plate 71, a rubber cylinder 72, an upper air cavity 721, a lower air cavity 722, a sliding ring 73, a sliding block 74, a guide pillar 75, a lead screw 76, a motor 77, a sealing bearing 8, a hollow connecting rod 9, a fixing rod 10, a supporting unit 11, a first connecting rod 111, a second connecting rod 112 and a protrusion 12.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 3, the plate leveling machine according to the present invention includes a controller, a support 1, a driving roller 2, a leveling unit 3, a sliding shaft, and a transmission chain, wherein one side of the support 1 is provided with a set of driving rollers 2, and the other side is provided with a leveling unit 3, and the leveling unit 3 is used for leveling a plate; the controller is arranged on the bracket 1 and used for controlling the driving roller 2 to rotate, and the driving roller 2 is rotationally arranged on the bracket 1 through a sliding shaft; the leveling unit 3 comprises a hollow shaft 31 and a leveling roller 32, and the driving roller 2 drives the leveling roller 32 through a transmission chain; the leveling rollers 32 are symmetrically arranged up and down, the cross sections of the leveling rollers 32 are in a bottleneck shape, and the leveling rollers 32 are rotatably arranged on the bracket 1 through hollow shafts 31; the outer rings of the leveling rollers 32 are all provided with annular rubber sheets 4; the space between the rubber sheet 4 and the leveling roller 32 is a cavity 5; the cavity 5 of one of the levelling rolls 32 is inflated to bulge the outer ring of the levelling roll 32; the cavity 5 of the other leveling roll 32 is evacuated to recess the outer circumference of the leveling roll 32; a group of through holes 6 are formed in the leveling roller 32, and the cavity 5 is communicated with the inner cavity of the hollow shaft 31 through the through holes 6. When the device works, the controller controls the driving roller 2 to rotate, the sheet with the raised middle part is pushed to horizontally move while being leveled, the leveling roller 32 is driven to rotate by the driving chain while the driving roller 2 rotates, the external air source inflates the cavity 5 of the upper leveling roller 32 through the hollow shaft 31 and the through hole 6, so that the air pressure in the cavity 5 of the upper leveling roller 32 is increased, and the rubber sheet 4 is elastically deformed and raised outwards under the action of the pressure; the extraction is located the gas in the leveling roller 32 cavity 5 of below simultaneously, make the leveling roller 32 cavity 5 of below form the negative pressure, the sheet rubber 4 is adsorbed on the outer lane of the leveling roller 32 of bottleneck type form of below, make the leveling roller 32 outer lane of below inwards sunken, this moment under the cooperation pressfitting of two leveling rollers 32, the bellied sheet metal of centering portion carries out the flattening, avoid springing back and leading to the flattening effect not good because of the bellied sheet metal flattening in middle part back, thereby improve the flattening effect and the flattening efficiency of the bellied sheet metal of centering portion of device.

In one embodiment, the thickness of the middle of the rubber sheet 4 is thinner than that of the edge. The during operation, when aerifing in external air supply top's flattening roller 32's cavity 5, the 5 internal pressure increases of the cavity of the flattening roller 32 of top, and elastic deformation takes place for rubber sheet 4 under the effect of pressure, and thickness through setting up the thickness at rubber sheet 4 middle part than the edge is thin for the emergence that can be relatively easy in rubber sheet 4 middle part is out of shape, thereby improves flattening unit 3's whole work efficiency.

As an embodiment, the support 1 is provided with a suction device 7 on one side, and the suction device 7 is used for communicating the cavities 5 of the two leveling rolls 32; the suction device 7 comprises two seal plates 71, two rubber cylinders 72, a sliding ring 73, a sliding block 74, a guide post 75, a lead screw 76 and a motor 77, wherein the rubber cylinders 72 are fixedly arranged between the two seal plates 71; the rubber cylinder 72 is sleeved with an annular sliding ring 73, and the sliding ring 73 can divide the space in the rubber cylinder 72 into an upper air cavity 721 and a lower air cavity 722; one end of the sliding ring 73 is fixedly connected to the sliding block 74, and the lead screw 76 can drive the sliding block 74 to slide on the guide post 75; the controller controls the motor 77 to rotate, and the output shaft of the motor 77 is connected with the lead screw 76; one end of the hollow shaft 31 is communicated with one end of an L-shaped hollow connecting rod 9 through a sealing bearing 8, the other end of one hollow connecting rod 9 extends into the upper air cavity 721, and the other end of the other hollow connecting rod 9 extends into the lower air cavity 722; the two hollow connecting rods 9 are both fixedly arranged on the bracket 1 through a fixed rod 10. When the leveling unit 3 works, when the leveling unit 3 needs to level a thin plate, the controller controls the motor 77 to rotate, the motor 77 rotates to drive the screw 76 to rotate, so as to drive the slider 74 to move up and down along the guide post 75, the slider 74 moves up and down to drive the sliding ring 73 fixedly connected with the slider 74 to move up and down, the sliding ring 73 moves up and down to extrude the rubber cylinder 72, so that the upper air cavity 721 and the lower air cavity 722 in the rubber cylinder 72 are compressed, when the sliding ring 73 moves up, the upper air cavity 721 of the rubber cylinder 72 is extruded, the air in the upper air cavity 721 is introduced into the hollow shaft 31 through the connected hollow connecting rod 9 after being compressed, and then enters the cavity 5 of the leveling roller 32 above from the through hole 6, so that the air pressure in the cavity 5 of the leveling roller 32 above is increased, and the rubber sheet 4 is elastically; meanwhile, when the slip ring 73 moves upwards to press the upper air cavity 721, negative pressure is formed in the lower air cavity 722, so that air in the cavity 5 of the lower leveling roll 32 is pumped into the lower air cavity 722 through the connected hollow shaft 31 and hollow connecting rod 9, and the outer ring of the lower leveling roll 32 is recessed inwards; the air inflation of the leveling roller 32 above and the air suction of the leveling roller 32 below are synchronously performed through the suction device 7, so that the working efficiency is improved on one hand, the use of an external air source is avoided on the other hand, and the energy is saved.

As one embodiment, a supporting unit 11 is disposed above the sliding ring 73, and the supporting unit 11 is used for assisting in squeezing the rubber cylinder 72; the supporting unit 11 comprises a first connecting rod 111 and a second connecting rod 112, one end of the first connecting rod 111 is hinged to the sliding ring 73, the other end of the first connecting rod 111 is hinged to one end of the second connecting rod 112, and the other end of the second connecting rod 112 is hinged to the sealing plate 71. In operation, when the sliding ring 73 moves upward with the sliding block 74, the supporting unit 11 disposed on the sliding ring 73 moves upward with it, so as to push the first connecting rod 111 and the second connecting rod 112 in the supporting unit 11 to assist in squeezing the outer ring of the rubber cylinder 72, so that the upper air chamber 721 is further compressed, thereby improving the suction efficiency of the suction device 7.

In one embodiment, the slip ring 73 is provided with an annular arc-shaped protrusion 12 on the inner ring. During operation, the sliding ring 73 moves up and down to extrude the rubber cylinder 72, the inner ring of the sliding ring 73 is in direct contact with the outer ring of the rubber cylinder 72, and the annular arc-shaped protrusion 12 is arranged on the inner ring of the sliding ring 73, so that the friction force between the pulley and the outer part of the rubber cylinder 72 is reduced, and the sliding ring 73 can move up and down conveniently.

As an embodiment, the supporting units 11 are circumferentially arranged in at least six groups. During operation, at least six groups of supporting units 11 are circumferentially arranged, so that the supporting units 11 can extrude the outer ring of the rubber cylinder 72 more uniformly, and the local stress of the outer ring of the rubber cylinder 72 is avoided.

When the device works, the controller controls the driving roller 2 to rotate, the sheet with the raised middle part is pushed to horizontally move while being leveled, the leveling roller 32 is driven to rotate by the driving chain while the driving roller 2 rotates, the external air source inflates the cavity 5 of the upper leveling roller 32 through the hollow shaft 31 and the through hole 6, so that the air pressure in the cavity 5 of the upper leveling roller 32 is increased, and the rubber sheet 4 is elastically deformed and raised outwards under the action of the pressure; simultaneously, air in the cavities 5 of the leveling rollers 32 positioned below is extracted, so that the cavities 5 of the leveling rollers 32 positioned below form negative pressure, the rubber sheets 4 are adsorbed on the outer rings of the bottleneck-shaped leveling rollers 32 positioned below, the outer rings of the leveling rollers 32 positioned below are inwards sunken, at the moment, the thin plates with the convex middle parts are leveled under the matching pressing of the two leveling rollers 32, the poor leveling effect caused by rebounding after the thin plates with the convex middle parts are leveled is avoided, and the leveling effect and the leveling efficiency of the thin plates with the convex middle parts are improved; when an external air source inflates air into the cavity 5 of the upper leveling roller 32, the pressure in the cavity 5 of the upper leveling roller 32 is increased, the rubber sheet 4 elastically deforms under the action of pressure, and the thickness of the middle part of the rubber sheet 4 is thinner than that of the edge, so that the middle part of the rubber sheet 4 can be easily deformed, and the overall working efficiency of the leveling unit 3 is improved; meanwhile, by arranging the suction device 7, when the leveling unit 3 needs to level a thin plate, the controller controls the motor 77 to rotate, the motor 77 rotates to drive the screw 76 to rotate, so as to drive the slider 74 to move up and down along the guide post 75, the slider 74 moves up and down to drive the sliding ring 73 fixedly connected with the slider 74 to move up and down, the sliding ring 73 moves up and down to extrude the rubber cylinder 72, so that the upper air cavity 721 and the lower air cavity 722 in the rubber cylinder 72 are compressed, when the sliding ring 73 moves up, the upper air cavity 721 of the rubber cylinder 72 is extruded, after the air in the upper air cavity 721 is compressed, the air is guided into the hollow shaft 31 through the connected hollow connecting rod 9, the air enters the cavity 5 in the leveling roller 32 above from the through hole 6, so that the cavity 5 of the leveling roller 32 above is increased in pressure, and the rubber sheet 4 is elastically deformed; meanwhile, when the slip ring 73 moves upwards to press the upper air cavity 721, negative pressure is formed in the lower air cavity 722, so that air in the cavity 5 of the lower leveling roll 32 is pumped into the lower air cavity 722 through the connected hollow shaft 31 and hollow connecting rod 9, and the outer ring of the lower leveling roll 32 is recessed inwards; the air inflation of the upper leveling roller 32 and the air suction of the lower leveling roller 32 are synchronously performed through the suction device 7, so that the working efficiency is improved, the use of an external air source is avoided, and the energy is saved; and by arranging the supporting unit 11, when the sliding ring 73 moves upwards along with the sliding block 74, the supporting unit 11 arranged on the sliding ring 73 moves upwards along with the sliding block, so that the first connecting rod 111 and the second connecting rod 112 in the supporting unit 11 are pushed to assist in extruding the outer ring of the rubber cylinder 72, the upper air cavity 721 is further compressed, and the suction efficiency of the suction device 7 is further improved; and the annular arc-shaped bulge 12 is arranged on the inner ring of the sliding ring 73, so that the friction force between the pulley and the outside of the rubber cylinder 72 is reduced, and the sliding ring 73 can move up and down conveniently.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in fig. 2, which is based on the orientation or positional relationship shown in fig. 2, and is used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be taken as limiting the scope of the present invention.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A plate flattening machine comprises a controller, a support (1), driving rollers (2), flattening units (3), a sliding shaft and a transmission chain, wherein one side of the support (1) is provided with a group of driving rollers (2), the other side of the support is provided with the flattening units (3), and the flattening units (3) are used for flattening plates; the controller is arranged on the bracket (1) and used for controlling the driving roller (2) to rotate, and the driving roller (2) is rotationally arranged on the bracket (1) through a sliding shaft; the method is characterized in that: the leveling unit (3) comprises a hollow shaft (31) and a leveling roller (32), and the driving roller (2) drives the leveling roller (32) through a transmission chain; the leveling rollers (32) are arranged in an up-and-down symmetrical mode, the cross sections of the leveling rollers (32) are in a bottleneck shape, and the leveling rollers (32) are rotatably installed on the support (1) through hollow shafts (31); the outer ring of the leveling roller (32) is provided with an annular rubber sheet (4); the space between the rubber sheet (4) and the leveling roller (32) is a cavity (5); wherein the cavity (5) of one of the levelling rolls (32) is inflated to bulge the outer ring of the levelling roll (32); the cavity (5) of the other leveling roll (32) is pumped down to make the outer ring of the leveling roll (32) concave; a group of through holes (6) are formed in the leveling roller (32), and the cavity (5) is communicated with the inner cavity of the hollow shaft (31) through the through holes (6);

a suction device (7) is arranged on one side of the support (1), and the suction device (7) is used for communicating the cavities (5) of the two leveling rollers (32); the suction device (7) comprises two sealing plates (71), two rubber cylinders (72), a sliding ring (73), a sliding block (74), a guide post (75), a lead screw (76) and a motor (77), wherein the rubber cylinders (72) are fixedly arranged between the two sealing plates (71); the rubber cylinder (72) is sleeved with an annular sliding ring (73), and the sliding ring (73) can divide the space in the rubber cylinder (72) into an upper air cavity (721) and a lower air cavity (722); one end of the sliding ring (73) is fixedly connected to the sliding block (74), and the lead screw (76) can drive the sliding block (74) to slide on the guide post (75); the controller controls the motor (77) to rotate, and an output shaft of the motor (77) is connected with the lead screw (76); one end of the hollow shaft (31) is communicated with one end of an L-shaped hollow connecting rod (9) through a sealing bearing (8), the other end of one hollow connecting rod (9) extends into the upper air cavity (721), and the other end of the other hollow connecting rod (9) extends into the lower air cavity (722); the two hollow connecting rods (9) are fixedly arranged on the bracket (1) through fixing rods (10);

a supporting unit (11) is arranged above the sliding ring (73), and the supporting unit (11) is used for assisting in extruding the rubber cylinder (72); the supporting unit (11) comprises a first connecting rod (111) and a second connecting rod (112), one end of the first connecting rod (111) is hinged to the sliding ring (73), the other end of the first connecting rod (111) is hinged to one end of the second connecting rod (112), and the other end of the second connecting rod (112) is hinged to the sealing plate (71);

the thickness of the middle part of the rubber sheet (4) is thinner than that of the edge;

when the device works, the controller controls the driving roller (2) to rotate, the sheet is pushed to horizontally move when the sheet with the raised middle part is leveled, the leveling roller (32) is driven to rotate through the transmission chain when the driving roller (2) rotates, the external air source inflates the cavity (5) of the leveling roller (32) above through the hollow shaft (31) and the through hole (6), so that the air pressure in the cavity (5) of the leveling roller (32) above is increased, and the rubber sheet (4) is elastically deformed and raised outwards under the action of the pressure; simultaneously, gas in a cavity (5) of the leveling roller (32) positioned below is extracted, so that the cavity (5) of the leveling roller (32) positioned below forms negative pressure, the rubber sheet (4) is adsorbed on the outer ring of the leveling roller (32) in the bottleneck shape below, the outer ring of the leveling roller (32) positioned below is inwards sunken, at the moment, the thin plate with the convex middle part is leveled under the matching pressing of the two leveling rollers (32), the poor leveling effect caused by the rebound of the thin plate with the convex middle part after being leveled is avoided, and the leveling effect and the leveling efficiency of the thin plate with the convex middle part of the device are improved; when an external air source inflates air into the cavity (5) of the leveling roller (32) which is arranged above, the pressure in the cavity (5) of the leveling roller (32) which is arranged above is increased, the rubber sheet (4) elastically deforms under the action of pressure, and the thickness of the middle part of the rubber sheet (4) is thinner than that of the edge, so that the middle part of the rubber sheet (4) can be easily deformed, and the overall working efficiency of the leveling unit (3) is improved; meanwhile, by arranging the suction device (7), when the leveling unit (3) needs to level the thin plate, the controller controls the motor (77) to rotate, the motor (77) rotates to drive the screw rod (76) to rotate, so as to drive the slide block (74) to move up and down along the guide post (75), the slide block (74) moves up and down to drive the slide ring (73) fixedly connected with the slide block to move up and down, the slide ring (73) moves up and down to extrude the rubber cylinder (72), so that an upper air cavity (721) and a lower air cavity (722) in the rubber cylinder (72) are compressed, when the slide ring (73) moves up, the upper air cavity (721) of the rubber cylinder (72) is extruded, air in the upper air cavity (721) is compressed and then guided into the hollow shaft (31) through the connected hollow connecting rod (9), and then enters the cavity (5) of the leveling roller (32) above from the through hole (6), so that the air pressure in the cavity (5) of the leveling roller (32, the rubber sheet (4) is elastically deformed and protrudes outwards under the action of pressure; meanwhile, when the slip ring (73) moves upwards to extrude the upper air cavity (721), negative pressure is formed in the lower air cavity (722), so that air in the cavity (5) of the leveling roller (32) below is pumped into the lower air cavity (722) through the connected hollow shaft (31) and hollow connecting rod (9), and the outer ring of the leveling roller (32) below is sunken inwards; the air inflation of the upper leveling roller (32) and the air suction of the lower leveling roller (32) are synchronously performed through the suction device (7), so that the working efficiency is improved, the use of an external air source is avoided, and the energy is saved; by arranging the supporting unit (11), when the sliding ring (73) moves upwards along with the sliding block (74), the supporting unit (11) arranged on the sliding ring (73) moves upwards along with the sliding block, so that the first connecting rod (111) and the second connecting rod (112) in the supporting unit (11) are pushed to assist in extruding the outer ring of the rubber cylinder (72), the upper air cavity (721) is further compressed, and the suction efficiency of the suction device (7) is improved; and the annular arc-shaped bulge (12) is arranged on the inner ring of the sliding ring (73), so that the friction force between the pulley and the outside of the rubber cylinder (72) is reduced, and the sliding ring (73) can move up and down conveniently.

2. A board screed according to claim 1 wherein: and an annular arc-shaped bulge (12) is arranged on the inner ring of the slip ring (73).

3. A board screed according to claim 1 wherein: the supporting units (11) are circumferentially arranged in at least six groups.