CN111516069A

CN111516069A - Pre-pressing machine for plywood production line

Info

Publication number: CN111516069A
Application number: CN202010324860.6A
Authority: CN
Inventors: 李成义; 孙庆松
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-08-11

Abstract

The invention belongs to the technical field of prepressing machines, and particularly relates to a prepressing machine for a plywood production line, which comprises a workbench; the workbench is provided with a supporting plate and a prepressing unit; the pre-pressing unit comprises a driving plate, a driven plate and a lead screw; the upper plate surface of the driving plate is fixedly connected to the lower plate surface of the first plate through bolts, the inner sides of four corners of the driving plate are connected to four lead screws through a first ball seat, and the four corners of the driving plate are in clearance fit with the outer rings of four support columns; one end of each lead screw is hinged on the supporting plate, and the other end of each lead screw is hinged on the workbench; a driven plate is arranged below the driving plate, the inner sides of four corners of the driven plate are connected to the four screw rods through a second ball seat, the four corners of the driven plate are in clearance fit with the outer rings of the four support columns, and the rotating direction of balls in the second ball seat is opposite to that of balls in the first ball seat; through the cooperation between backup pad, cylinder and the pre-compaction unit, realize the pre-compaction processing to the plywood.

Description

Pre-pressing machine for plywood production line

Technical Field

The invention belongs to the technical field of prepresses, and particularly relates to a prepress for a plywood production line.

Background

The prepress is an auxiliary machine of a plywood production line, is mechanical equipment for performing preliminary bonding before gluing in the production process for shortening the hot pressing period and improving the quality of boards, and belongs to pressure machinery. The prepress mainly carries out cold pressing for a short time on the veneers after gluing and assembly to enable the veneers to be initially formed and then sent into a hot press for hot-pressing and gluing. The plywood is important equipment for improving the quality of plywood and is also an important link. The prepress generally comprises a frame, a fixed cross beam, a movable cross beam, a plate discharging device, an oil cylinder, a hydraulic system and an electric control device.

During the production process of the plywood, the boards and the glue are subjected to cold pressing by a prepress, the adjacent boards are adhered together by the glue, air between the adjacent boards is expelled, and then the adjacent boards are firmly adhered together by a hot press; if air still exists between the plates after cold pressing, the air in the plates is preheated and expanded after the plates are hot-pressed, so that the surfaces of the plates after hot pressing are bulged, and the plate production fails.

The plywood prepressing device provided by the application number 2019202336119 comprises a workbench, a support frame, a top plate and a pressing plate, wherein the workbench is horizontally arranged, the support frame is arranged at the edge of the workbench, the top plate is fixed at the top end of the support frame, the pressing plate is arranged between the workbench and the top plate, one surface, close to the top plate, of the pressing plate is fixedly connected with a piston rod, and the piston rod is connected with an oil cylinder; the plate storage box is arranged on the extension table on one side of the workbench and is connected with a push rod; the damping device is arranged on the workbench and positioned on one side adjacent to the plate storage box; the inside ejecting device that is equipped with of workstation, ejecting device have a plurality ofly and along workstation center interval equipartition. This equipment realizes automatic feeding through storage case and push rod to by the plywood of ejecting device separation bonding on the workstation, work efficiency has been improved, but this pre-compaction equipment is when to the panel pre-compaction, only the clamp plate is to being close to panel gradually, increase the pre-compaction time of panel, pre-compaction inefficiency, and simultaneously, the air in the panel is failed effectively to catch up with out, the air in the panel preheats the inflation after panel carries out the hot pressing, can lead to the panel surface after the hot pressing to bulge, lead to panel production failure.

In view of the above, in order to overcome the above technical problems, the present inventors have designed and developed a prepress for a plywood production line, which reduces the prepressing time of a sheet material by moving a driving plate and a driven plate simultaneously and pressing the sheet material, and drives out air in the sheet material by a pressing roller, thereby solving the above technical problems.

Disclosure of Invention

The invention provides a prepressing machine for a plywood production line, which aims to make up the defects of the prior art and solve the problems that the prepressing efficiency of a board is low, and the air in the board cannot be effectively expelled, so that the surface of the board after hot pressing is bulged, and the board is failed to produce.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a prepress for a plywood production line, which comprises a workbench; the workbench is provided with a supporting plate and a prepressing unit; the lower plate surface of the supporting plate is connected with the upper plate surface of the workbench through a supporting column, the upper plate surface of the supporting plate is provided with a cylinder, the cylinder is connected with the upper plate surface of the supporting plate through a bolt, a piston rod of the cylinder penetrates through the supporting plate and is fixedly connected with the upper plate surface of the first plate, and the lower plate surface of the first plate is fixedly connected with a prepressing unit; the pre-pressing unit comprises a driving plate, a driven plate and a lead screw; the upper plate surface of the driving plate is fixedly connected to the lower plate surface of the first plate through bolts, the inner sides of four corners of the driving plate are connected to four lead screws through a first ball seat, and the four corners of the driving plate are in clearance fit with the outer rings of four support columns; one end of each lead screw is hinged to the supporting plate, and the other end of each lead screw is hinged to the workbench; a driven plate is arranged below the driving plate, the inner sides of four corners of the driven plate are connected to the four screw rods through a second ball seat, the four corners of the driven plate are in clearance fit with the outer rings of the four support columns, and the rotating direction of balls in the second ball seat is opposite to that of balls in the first ball seat; through the matching among the supporting plate, the air cylinder and the prepressing unit, the prepressing treatment of the plywood is realized; when the plywood works, the boards and the glue are subjected to cold pressing by the pre-press in the production process of the plywood, the adjacent boards are adhered together by the glue, air between the adjacent boards is expelled, and then the adjacent boards are firmly bonded together by the hot press; when the existing prepressing machine performs cold pressing and exhausting on a plate, the plate is placed on the prepressing machine, a piston rod on the prepressing machine pushes the prepressing plate to gradually approach the plate, and only the prepressing plate moves, so that the prepressing efficiency of the plate is low, and therefore, the efficiency of the prepressing machine for extruding the plate is improved; the plate is extruded and exhausted simultaneously through the driving plate and the driven plate, the plywood is placed behind the driven plate, the air cylinder is started, then a piston rod of the air cylinder moves downwards, the driving plate is pressed downwards through the first plate, the driving plate is connected to the four lead screws through the first ball seat, when the driving plate moves downwards actively, the driving plate rubs the four lead screws through the first ball seat to rotate, at the moment, the driving directions of the second ball seat and the first ball seat on the driven plate are opposite, so that the second ball drives the driven plate to move upwards along the lead screws, the driving plate and the driven plate move towards each other simultaneously, the prepressing time of the prepressing machine for the plate is shortened, and the efficiency of the prepressing machine is improved.

Preferably, a plurality of transition hooks are symmetrically arranged on the lower plate surface of the support plate, a first hook is arranged below each transition hook and fixedly connected to the side surface of the driving plate, a second hook is arranged below each first hook and fixedly connected to the side surface of the driven plate, one end of a steel wire rope is tied to each second hook, the other end of the steel wire rope penetrates through the transition hooks and is tied to the first hooks, and a push plate is arranged between every two adjacent steel wire ropes; the extrusion force of the driving plate and the driven plate to the plywood is enhanced again through the matching of the first hook, the second hook and the transition hook; when the driving plate and the driven plate move oppositely and approach to each other, the first hook on the driving plate pulls one end of the steel wire rope, then the other end of the steel wire rope pulls the second hook, and meanwhile, the second hook pulls the driven plate upwards, so that the extrusion of the driven plate on the plate is enhanced; when the driving plate extrudees panel with the driven plate, glue has been smeared between the panel, when glue is not dry, glue plays lubricated effect to between the adjacent panel, when causing between the adjacent panel by the extrusion, the slip phenomenon appears between the adjacent panel, lead to the panel edge irregularity, can increase the back panel edge cutting area of colding pressing, cause the waste of panel and glue, for this reason through settling the push pedal on the wire rope, make the push pedal can with driven plate simultaneous movement, thereby panel edge is near on the lateral wall of push pedal always, when avoiding the panel extrusion, the mutual slip phenomenon between the panel appears.

Preferably, the lower plate surface of the driving plate is symmetrically provided with a first groove, and each first groove is internally provided with an extrusion unit; the extrusion unit comprises an extrusion roller, a first rod and a first torsion spring; the middle position of the extrusion roller is fixedly connected with one end of a first rod, and the other end of the first rod is hinged to the side wall of the first groove through a first torsion spring; the extrusion of the air in the plywood is realized through the extrusion unit; when the face of initiative board extrudees panel, if the whole board of initiative board extrudees panel, the air in the glue is unable effectively all to be extruded, when panel is carrying out hot pressing, the air in the glue is met thermal expansion, make the plywood face of producing bloated, lead to the unevenness of plywood face, for this reason through the form of extruding to both sides from the intermediate position of panel, extrude the air in the glue, when the initiative board is close to panel gradually, the squeeze roll is extruded with panel earlier, in-process that the initiative board is close to panel gradually, the squeeze roll removes to the border position of board from the intermediate position of panel gradually, extrude panel simultaneously, and catch up out the bubble in the glue in the panel, thereby when avoiding panel to carry out hot pressing, the emergence of unevenness phenomenon is bloated on the panel surface.

Preferably, an arc-shaped rod is arranged on each first rod and close to the extrusion roller, the end part of each arc-shaped rod is inserted into a through hole formed in the top surface of the first groove, a first spring is sleeved on the outer ring of each arc-shaped rod, and the through hole penetrates through the driving plate; the extrusion force of the extrusion roller on the plywood is enhanced through the matching between the arc-shaped rod and the first spring; in order to effectively catch up out the bubble in the glue, strengthen the extrusion force of squeeze roll to panel through a spring and arc pole, when the squeeze roll moves from the intermediate position of panel to the border position of panel, the contained angle between a pole and the driving plate diminishes gradually, a pole extrudees a spring gradually simultaneously, the elasticity counteraction of a spring is on a pole, the squeeze roll is pressed to a pole simultaneously, make the squeeze roll strengthen to the extrusion force of panel, a pole moves under the guide of arc pole simultaneously, when making the squeeze roll move on the panel of unevenness, reduce the wearing and tearing between a groove and a pole outer wall, prolong the life of extrusion unit.

Preferably, the upper plate surface of the driven plate is provided with a plurality of strip-shaped second grooves, the second grooves are provided with second spring-connected separating plates, and after the separating plates are extruded into the second grooves, the upper plate surface of the separating plates is flush with the notches of the second grooves; the driven plate is separated from the plywood through the matching among the second groove, the separating plate and the second spring; when the driven plate extrudes the plate, glue in the plate permeates the plate and flows into a space between the plate and the driven plate, the plate is taken down from a prepressing machine after cold pressing, if the plate is adhered to the driven plate, the surface of the plate can be torn and broken in the process of taking down the plate from the driven plate, so that cold pressing failure of the plate is caused, and therefore, the occupied area between the plate and the driven plate is reduced by arranging a separation plate on the driven plate; when the driven plate and the driving plate are far away from each other, the separating plate extends out of the second groove through the second spring, the separating plate upwards supports the plate, only the surface of the separating plate is in contact with the plate at the moment, the bonding area between the plate and the driven plate is reduced, and therefore the damage phenomenon on the surface of the plate is avoided when the plate is taken down from the driven plate.

Preferably, two ends of each separating plate are hinged with the supporting plate through a second torsion spring respectively; the lower surface of the plywood is flattened through the matching between the supporting plate and the second torsion spring; when the plate is subjected to cold pressing, glue in the middle of the plate can be extruded to the edge of the plate, so that the edge of the plate cannot be coated with the glue; panel edge has not been smeared glue, panel edge can receive self gravity to influence, panel edge drooping downwards, panel is placed on the driven plate, if the untimely plain cloth in panel edge is on the driven plate, panel edge can be bent the fracture, lead to panel surface unevenness, for this reason, through settling the layer board on the separator plate, when placing panel on the driven plate, the layer board is floating with the edge of panel, make the even falling of panel on the driven plate, thereby avoid the phenomenon emergence of panel unevenness after colding pressing.

The invention has the technical effects and advantages that:

1. according to the prepress for the plywood production line, the driving plate and the driven plate move oppositely at the same time and extrude the board, the prepressing time of the board is saved, meanwhile, the air in the board is extruded out in a mode that the extruding roller extrudes the board from the middle position of the board to the edge of the board, and the extruding roller is enhanced to extrude the board again in a matching mode of matching the first spring and the arc-shaped rod, so that the air in the board is effectively extruded out.

2. According to the prepress for the plywood production line, disclosed by the invention, the attaching area between the plate and the driving plate can be reduced through the extrusion roller, the separation plate is arranged on the driven plate, the adhering area between the plate and the driven plate is reduced, so that the phenomenon that the outer surface of the plate is adhered and torn when the plate is separated from the driving plate and the driven plate is avoided, and the plate is enabled to fall on the driven plate smoothly through the arrangement of the supporting plate on the separation plate, so that the phenomenon that the plate is not flat after cold pressing is avoided.

Drawings

The invention is further described with reference to the following figures and embodiments.

FIG. 1 is a perspective view of the present invention;

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

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

FIG. 4 is an enlarged view of a portion of FIG. 2 at B;

in the figure: the device comprises a workbench 1, a support column 11, a support plate 2, a cylinder 21, a first plate 211, a transition hook 22, a steel wire 23, a push plate 231, a pre-pressing unit 3, a driving plate 31, a first hook 311, a first groove 312, a driven plate 32, a second hook 321, a second groove 322, a second spring 323, a separating plate 324, a second torsion spring 325, a supporting plate 326, a lead screw 33, a first ball seat 331, a second ball seat 332, an extrusion unit 4, an extrusion roller 41, a first rod 42, a first torsion spring 43, an arc-shaped rod 421 and a first spring 422.

Detailed Description

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

As shown in fig. 1 to 4, the prepress for plywood production line according to the present invention includes a table 1; the workbench 1 is provided with a supporting plate 2 and a prepressing unit 3; the lower plate surface of the support plate 2 is connected with the upper plate surface of the workbench 1 through a support column 11, the upper plate surface of the support plate 2 is provided with a cylinder 21, the cylinder 21 is connected with the upper plate surface of the support plate 2 through a bolt, a piston rod of the cylinder 21 penetrates through the support plate 2 and is fixedly connected with the upper plate surface of a plate 211, and the lower plate surface of the plate 211 is fixedly connected with a pre-pressing unit 3; the pre-pressing unit 3 comprises a driving plate 31, a driven plate 32 and a screw 33; the upper plate surface of the driving plate 31 is fixedly connected to the lower plate surface of the first plate 211 through bolts, the inner sides of four corners of the driving plate 31 are connected to the four screw rods 33 through the first ball seats 331, and the four corners of the driving plate 31 are in clearance fit with the outer rings of the four support columns 11; one end of each lead screw 33 is hinged to the support plate 2, and the other end of each lead screw 33 is hinged to the workbench 1; the driven plate 32 is arranged below the driving plate 31, the inner sides of four corners of the driven plate 32 are connected to the four screw rods 33 through second ball seats 332, the four corners of the driven plate 32 are in clearance fit with the outer rings of the four support columns 11, and the rotating direction of balls in the second ball seats 332 is opposite to that of balls in the first ball seats 331; the prepressing treatment of the plywood is realized through the matching among the supporting plate 2, the cylinder 21 and the prepressing unit 3; when the plywood works, the boards and the glue are subjected to cold pressing by the pre-press in the production process of the plywood, the adjacent boards are adhered together by the glue, air between the adjacent boards is expelled, and then the adjacent boards are firmly bonded together by the hot press; when the existing prepressing machine performs cold pressing and exhausting on a plate, the plate is placed on the prepressing machine, a piston rod on the prepressing machine pushes the prepressing plate to gradually approach the plate, and only the prepressing plate moves, so that the prepressing efficiency of the plate is low, and therefore, the efficiency of the prepressing machine for extruding the plate is improved; the plate is extruded and exhausted simultaneously through the driving plate 31 and the driven plate, the plywood is placed behind the driven plate 32, the air cylinder 21 is started, then a piston rod of the air cylinder 21 moves downwards, the driving plate 31 is pressed downwards through the first plate 211, the driving plate 31 is connected to the four lead screws 33 through the first ball seat 331, when the driving plate moves downwards actively, the driving plate 31 rubs the four lead screws 33 to rotate through the first ball seat 331, and at the moment, the second ball drives the driven plate 32 to move upwards along the lead screws 33 due to the fact that the rotation driving directions of the second ball seat 332 and the first ball seat 331 on the driven plate 32 are opposite, so that the driving plate 31 and the driven plate 32 move towards each other simultaneously, the pre-pressing time of the pre-pressing machine for the plate is shortened, and the efficiency of the pre-pressing machine is improved.

As a specific embodiment of the present invention, a plurality of transition hooks 22 are symmetrically arranged on the lower plate surface of the support plate 2, a first hook 311 is arranged below each transition hook 22, each first hook 311 is fixedly connected to the side surface of the driving plate 31, a second hook 321 is arranged below each first hook 311, each second hook 321 is fixedly connected to the side surface of the driven plate 32, each second hook 321 is tied with one end of a steel wire 23, the other end of the steel wire 23 passes through the transition hook 22 and is tied to the first hook 311, and a push plate 231 is arranged between adjacent steel wires 23; the extrusion force between the driving plate 31 and the driven plate 32 to the plywood is enhanced again through the matching of the first hook 311, the second hook 321 and the transition hook 22; when the driving plate 31 and the driven plate 32 move towards each other and approach to each other, the first hook 311 on the driving plate 31 pulls one end of the steel wire 23, then the other end of the steel wire 23 pulls the second hook 321, and meanwhile the second hook 321 pulls the driven plate 32 upwards, so that the extrusion of the driven plate 32 on the plate is enhanced; when driving board 31 and driven board 32 extrude panel, glue has been paintd between the panel, when glue is not dry, glue plays lubricated effect to between the adjacent panel, when causing between the adjacent panel by the extrusion, the slip phenomenon appears between the adjacent panel, lead to the panel edge irregularity, can increase the back panel edge cutting area of colding pressing, cause the waste of panel and glue, for this reason through settling push pedal 231 on wire 23, make push pedal 231 can with driven board 32 simultaneous movement, thereby panel edge is on the lateral wall at push pedal 231 always, when avoiding the panel extrusion, the mutual slip phenomenon between the panel appears.

As a specific embodiment of the present invention, first slots 312 are symmetrically formed on a lower plate surface of the active plate 31, and an extrusion unit 4 is arranged in each first slot 312; the squeezing unit 4 comprises a squeezing roller 41, a first rod 42 and a first torsion spring 43; one end of a first rod 42 is fixedly connected to the middle position of the squeezing roller 41, and the other end of the first rod 42 is hinged to the side wall of the first groove 312 through a first torsion spring 43; the extrusion of the air in the plywood is realized through the extrusion unit 4; when the board of initiative board 31 extrudees the panel, if the whole board of initiative board 31 extrudees the panel, the air in the glue is unable effectively all to be extruded, when panel is carrying out hot pressing, the air in the glue is met thermal expansion, make the plywood face of producing bloated, lead to the unevenness of plywood face, for this reason through the form of extruding from the intermediate position of panel to both sides, extrude the air in the glue, when initiative board 31 is close to the panel gradually, squeeze roll 41 extrudes with the panel earlier, in the in-process that initiative board 31 is close to the panel gradually, squeeze roll 41 removes to the border position of board from the intermediate position of panel gradually, extrude the panel simultaneously, and catch up the bubble in the glue in the panel, thereby when avoiding the panel to carry out hot pressing, the emergence of unevenness phenomenon is bloated on the panel surface.

As a specific embodiment of the present invention, an arc rod 421 is disposed on each first rod 42 at a position close to the squeeze roller 41, an end of the arc rod 421 is inserted into a through hole formed in the inner top surface of the first groove 312, a first spring 422 is sleeved on an outer ring of the arc rod 421, and the through hole penetrates through the driving plate 31; the extrusion force of the extrusion roller 41 on the plywood is enhanced through the matching between the arc-shaped rod 421 and the first spring 422; in order to effectively expel air bubbles in the glue, the extrusion force of the extrusion roller 41 on the plate is enhanced through the first spring 422 and the arc-shaped rod 421, when the extrusion roller 41 moves from the middle position of the plate to the edge position of the plate, the included angle between the first rod 42 and the driving plate 31 is gradually reduced, the first rod 42 gradually extrudes the first spring 422, the elastic force of the first spring 422 reacts on the first rod 42, the first rod 42 presses the extrusion roller 41, the extrusion force of the extrusion roller 41 on the plate is enhanced, and the first rod 42 moves under the guidance of the arc-shaped rod 421, so that when the extrusion roller 41 moves on the uneven plate, the abrasion between the outer walls of the first groove 312 and the first rod 42 is reduced, and the service life of the extrusion unit 4 is prolonged.

As a specific embodiment of the present invention, the upper plate surface of the driven plate 32 is provided with a plurality of strip-shaped second grooves 322, the second grooves 322 are provided with separating plates 324 connected by second springs 323, and after the separating plates 324 are pressed into the second grooves 322, the upper plate surface of the separating plates 324 is flush with the notches of the second grooves 322; the driven plate 32 is separated from the plywood through the matching among the second groove 322, the separating plate 324 and the second spring 323; when the driven plate 32 extrudes the plate, glue in the plate permeates the plate and flows into a space between the plate and the driven plate 32, after the plate is subjected to cold pressing, the plate is taken down from a prepress, if the plate is adhered to the driven plate 32, the surface of the plate can be torn off in the process of taking the plate down from the driven plate 32, so that the cold pressing of the plate fails, and therefore, the occupied area between the plate and the driven plate 32 is reduced by arranging the separating plate 324 on the driven plate 32; when the driven plate 32 and the driving plate 31 are far away from each other, the separating plate 324 extends out of the second groove 322 through the second spring 323, the separating plate 324 supports the plate upwards, only the plate surface of the separating plate 324 contacts with the plate, namely, the bonding area between the plate and the driven plate 32 is reduced, and therefore the phenomenon that the plate surface is damaged when the plate is taken down from the driven plate 32 is avoided.

As a specific embodiment of the present invention, two ends of each separating plate 324 are hinged to a supporting plate 326 through a second torsion spring 325; the lower surface of the plywood is flattened through the matching between the supporting plate 326 and the second torsion spring 325; when the plate is subjected to cold pressing, glue in the middle of the plate can be extruded to the edge of the plate, so that the edge of the plate cannot be coated with the glue; plate edge has not been smeared glue, plate edge can receive self gravity to influence, plate edge drooping downwards, plate places on driven plate 32, if the untimely plain cloth in plate edge is on driven plate 32, plate edge can be bent the fracture, lead to panel surface unevenness, for this reason, through settling layer board 326 on separation plate 324, when placing plate on driven plate 32, layer board 326 screeds the edge of plate, make the flat falling on driven plate 32 of plate, thereby avoid the phenomenon of panel unevenness to take place after colding pressing.

When the plywood works, the boards and the glue are subjected to cold pressing by the pre-press in the production process of the plywood, the adjacent boards are adhered together by the glue, air between the adjacent boards is expelled, and then the adjacent boards are firmly bonded together by the hot press; when the existing prepressing machine performs cold pressing and exhausting on a plate, the plate is placed on the prepressing machine, a piston rod on the prepressing machine pushes the prepressing plate to gradually approach the plate, and only the prepressing plate moves, so that the prepressing efficiency of the plate is low, and therefore, the efficiency of the prepressing machine for extruding the plate is improved; the plate is extruded and exhausted simultaneously through the driving plate 31 and the driven plate, the plywood is placed behind the driven plate 32, the air cylinder 21 is started, then a piston rod of the air cylinder 21 moves downwards, the driving plate 31 is pressed downwards through the first plate 211, the driving plate 31 is connected to the four lead screws 33 through the first ball seat 331, when the driving plate moves downwards actively, the driving plate 31 rubs the four lead screws 33 to rotate through the first ball seat 331, at the moment, because the driving directions of the second ball seat 332 on the driven plate 32 and the first ball seat 331 are opposite, the second ball drives the driven plate 32 to move upwards along the lead screws 33, the driving plate 31 and the driven plate 32 move towards each other simultaneously, the plate prepressing time of the prepress is shortened, and the efficiency of the prepress is improved; when the driving plate 31 and the driven plate 32 move towards each other and approach to each other, the first hook 311 on the driving plate 31 pulls one end of the steel wire 23, then the other end of the steel wire 23 pulls the second hook 321, and meanwhile the second hook 321 pulls the driven plate 32 upwards, so that the extrusion of the driven plate 32 on the plate is enhanced; when the driving plate 31 and the driven plate 32 extrude the plates, glue is coated between the plates, and when the glue is not dried, the glue plays a role of lubricating the adjacent plates, so that when the adjacent plates are extruded, a sliding phenomenon occurs between the adjacent plates, the edges of the plates are uneven, the cutting area of the edges of the plates after cold pressing can be increased, and the waste of the plates and the glue is caused, therefore, the push plate 231 is arranged on the steel wire rope 23, the push plate 231 can synchronously move with the driven plate 32, so that the edges of the plates are always close to the side wall of the push plate 231, and the phenomenon of mutual sliding between the plates is avoided when the plates are extruded; when the board of the driving plate 31 extrudes the board, if the whole board of the driving plate 31 extrudes the board, the air in the glue is not extruded effectively, when the board is hot-pressed, the air in the glue expands when heated, so that the produced board of the plywood expands, and the surface of the plywood is uneven, therefore, the air in the glue is extruded out through a mode of extruding from the middle position of the board to two sides, when the driving plate 31 gradually approaches the board, the extrusion rollers 41 firstly extrude the board, and in the process that the driving plate 31 gradually approaches the board, the extrusion rollers 41 gradually move from the middle position of the board to the edge position of the board, and simultaneously extrude the board and expel the bubbles in the glue in the board, thereby avoiding the phenomenon that the surface of the board bulges and is uneven when the board is hot-pressed; in order to effectively expel bubbles in the glue, the extrusion force of the extrusion roller 41 on the plate is enhanced through the first spring 422 and the arc-shaped rod 421, when the extrusion roller 41 moves from the middle position of the plate to the edge position of the plate, the included angle between the first rod 42 and the driving plate 31 is gradually reduced, the first rod 42 gradually extrudes the first spring 422, the elastic force of the first spring 422 is reacted on the first rod 42, the first rod 42 presses the extrusion roller 41, so that the extrusion force of the extrusion roller 41 on the plate is enhanced, and the first rod 42 moves under the guidance of the arc-shaped rod 421, so that when the extrusion roller 41 moves on an uneven plate, the abrasion between the outer walls of the first groove 312 and the first rod 42 is reduced, and the service life of the extrusion unit 4 is prolonged; when the driven plate 32 extrudes the plate, glue in the plate permeates the plate and flows into a space between the plate and the driven plate 32, after the plate is subjected to cold pressing, the plate is taken down from a prepress, if the plate is adhered to the driven plate 32, the surface of the plate can be torn off in the process of taking the plate down from the driven plate 32, so that the cold pressing of the plate fails, and therefore, the occupied area between the plate and the driven plate 32 is reduced by arranging the separating plate 324 on the driven plate 32; when the driven plate 32 and the driving plate 31 are far away from each other, the separating plate 324 extends out of the second groove 322 through the second spring 323, the separating plate 324 supports the plate upwards, only the plate surface of the separating plate 324 contacts with the plate, namely the bonding area between the plate and the driven plate 32 is reduced, and therefore the phenomenon that the plate surface is damaged when the plate is taken down from the driven plate 32 is avoided; when the plate is subjected to cold pressing, glue in the middle of the plate can be extruded to the edge of the plate, so that the edge of the plate cannot be coated with the glue; plate edge has not been smeared glue, plate edge can receive self gravity to influence, plate edge drooping downwards, plate places on driven plate 32, if the untimely plain cloth in plate edge is on driven plate 32, plate edge can be bent the fracture, lead to panel surface unevenness, for this reason, through settling layer board 326 on separation plate 324, when placing plate on driven plate 32, layer board 326 screeds the edge of plate, make the flat falling on driven plate 32 of plate, thereby avoid the phenomenon of panel unevenness to take place after colding pressing.

The foregoing illustrates and describes the principles, essential features and advantages of the 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 given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A prepress for a plywood production line is characterized in that; comprises a workbench (1); the workbench (1) is provided with a support plate (2) and a prepressing unit (3); the lower plate surface of the supporting plate (2) is connected with the upper plate surface of the workbench (1) through a supporting column (11), the upper plate surface of the supporting plate (2) is provided with a cylinder (21), the cylinder (21) is connected with the upper plate surface of the supporting plate (2) through a bolt, a piston rod of the cylinder (21) penetrates through the supporting plate (2) and is fixedly connected with the upper plate surface of a plate (211), and the lower plate surface of the plate (211) is fixedly connected with a pre-pressing unit (3); the pre-pressing unit (3) comprises a driving plate (31), a driven plate (32) and a lead screw (33); the upper plate surface of the driving plate (31) is fixedly connected to the lower plate surface of the first plate (211) through bolts, the inner sides of four corners of the driving plate (31) are connected to four lead screws (33) through a first ball seat (331), and the four corners of the driving plate (31) are in clearance fit with the outer rings of four support columns (11); one end of each lead screw (33) is hinged to the support plate (2), and the other end of each lead screw (33) is hinged to the workbench (1); a driven plate (32) is arranged below the driving plate (31), the inner sides of four corners of the driven plate (32) are connected to four lead screws (33) through a second ball seat (332), the four corners of the driven plate (32) are in clearance fit with the outer rings of four supporting columns (11), and the rotating direction of balls in the second ball seat (332) is opposite to that of balls in the first ball seat (331); through the cooperation between backup pad (2), cylinder (21) and the pre-compaction unit (3), realize the pre-compaction of plywood.

2. The prepress for a plywood production line according to claim 1, characterized in that: a plurality of transition hooks (22) are symmetrically arranged on the lower plate surface of the supporting plate (2), a first hook (311) is arranged below each transition hook (22), each first hook (311) is fixedly connected to the side surface of the driving plate (31), a second hook (321) is arranged below each first hook (311), each second hook (321) is fixedly connected to the side surface of the driven plate (32), one end of a steel wire rope (23) is tied to each second hook (321), the other end of the steel wire rope (23) penetrates through the transition hooks (22) and is tied to the first hook (311), and a push plate (231) is arranged between every two adjacent steel wire ropes (23); the extrusion force between the driving plate (31) and the driven plate (32) to the plywood is enhanced again through the matching among the first hook (311), the second hook (321) and the transition hook (22).

3. The prepress for a plywood production line according to claim 2, wherein: first grooves (312) are symmetrically formed in the lower plate surface of the driving plate (31), and an extrusion unit (4) is arranged in each first groove (312); the extrusion unit (4) comprises an extrusion roller (41), a first rod (42) and a first torsion spring (43); one end of a first rod (42) is fixedly connected to the middle position of the squeezing roller (41), and the other end of the first rod (42) is hinged to the side wall of the first groove (312) through a first torsion spring (43); through extrusion unit (4), realize pushing out to the extrusion of air in the plywood.

4. The prepress for a plywood production line according to claim 3, wherein: an arc-shaped rod (421) is arranged on each first rod (42) and close to the extrusion roller (41), the end part of each arc-shaped rod (421) is inserted into a through hole formed in the inner top surface of the first groove (312), a first spring (422) is sleeved on the outer ring of each arc-shaped rod (421), and the through hole penetrates through the driving plate (31); the extrusion force of the extrusion roller (41) to the plywood is enhanced through the matching between the arc-shaped rod (421) and the first spring (422).

5. The prepress for a plywood production line according to claim 2, wherein: a plurality of strip-shaped second grooves (322) are formed in the upper plate surface of the driven plate (32), separating plates (324) connected with second springs (323) are arranged in the second grooves (322), and after the separating plates (324) are extruded into the second grooves (322), the upper plate surface of the separating plates (324) is flush with the notches of the second grooves (322); the driven plate (32) is separated from the plywood through the matching among the second groove (322), the separating plate (324) and the second spring (323).

6. The prepress for a plywood production line according to claim 5, wherein: two ends of each separating plate (324) are hinged with a supporting plate (326) through a second torsion spring (325); the lower surface of the plywood is flattened by matching the supporting plate (326) with the second torsion spring (325).