CN215549345U - Diagonal saw mechanism of paving machine - Google Patents

Diagonal saw mechanism of paving machine Download PDF

Info

Publication number
CN215549345U
CN215549345U CN202121507434.2U CN202121507434U CN215549345U CN 215549345 U CN215549345 U CN 215549345U CN 202121507434 U CN202121507434 U CN 202121507434U CN 215549345 U CN215549345 U CN 215549345U
Authority
CN
China
Prior art keywords
clearance
diagonal saw
frame
guide rail
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202121507434.2U
Other languages
Chinese (zh)
Inventor
耿亮
代庆洪
于文杰
李红
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tongling Wanhua Hexiang Board Co ltd
Original Assignee
Tongling Wanhua Hexiang Board Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tongling Wanhua Hexiang Board Co ltd filed Critical Tongling Wanhua Hexiang Board Co ltd
Priority to CN202121507434.2U priority Critical patent/CN215549345U/en
Application granted granted Critical
Publication of CN215549345U publication Critical patent/CN215549345U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

The utility model relates to the technical field of straw plate processing equipment, in particular to a diagonal saw mechanism of a paving machine, which comprises a conveying frame, a portal frame and a diagonal saw body, wherein a plurality of rotating shafts are rotatably arranged in the conveying frame at equal intervals, and a plurality of conveying wheels are fixed on the outer wall of each rotating shaft at equal intervals; the conveying frame is fixedly arranged at the top end of the conveying frame, a guide rail seat is slidably arranged in the portal frame, a pair of first electric cylinders is arranged between the upper end face of the guide rail seat and the portal frame, a sliding seat is slidably arranged at the bottom end of the guide rail seat through a guide rail, a diagonal saw body is fixedly arranged at the bottom end of the sliding seat, a screw rod penetrates through the inside of the sliding seat and is driven by a servo motor, and a pair of compression assemblies are arranged on the left outer wall and the right outer wall of a top beam of the portal frame; the core layer plate pressing device can flexibly use the pressing assembly to press the core layer plate, ensures the leveling of the sawing surface, is also suitable for sawing the core layer plates with different thicknesses, and meets the requirement of large-scale production of enterprises.

Description

Diagonal saw mechanism of paving machine
Technical Field
The utility model relates to the technical field of straw board processing equipment, in particular to a diagonal saw mechanism of a paving machine.
Background
The straw board is made by using crushed crop straws as a main raw material, applying MDI glue and a functional additive and performing high-temperature and high-pressure manufacturing, and has the characteristics of flatness, smoothness, uniform and symmetrical structure, solid board surface, good dimensional stability, high strength, environmental protection, flame retardance, good weather resistance and the like. The straw board also has excellent processing performance and surface decorative performance, and is suitable for various surface decorative treatments and mechanical processing, in particular to the processing of special-shaped edges; compared with the shaving board, the wood-based artificial board has obvious advantages and can be widely used for replacing wood-based artificial boards and natural wood.
The diagonal saw is a device for transversely cutting continuous plate blanks on a straw plate core layer spreading machine, is arranged at a certain angle with a main production line, and moves in a left-right reciprocating mode. The utility model discloses a cross-section diagonal saw for producing fiberboards, which comprises a conveying frame and a diagonal saw mounting frame, wherein a roller is mounted in the conveying frame, a fiberboard to be processed is placed on the roller, the fiberboard is put in from one end of the conveying frame and is conveyed to the other end by the roller, a clamping device is arranged at the tail end of the conveying frame, and the clamping device consists of a clamping plate, a clamping groove formed in the front end face of the clamping plate and a tangential transition plate connected with the lower port of the clamping groove; the diagonal saw mounting frame consists of a stand column and a cross beam, wherein the cross beam is provided with a cylinder, and the cylinder is connected with a diagonal saw through a cylinder push rod; however, the utility model still has a plurality of disadvantages: the core layer plate is lack of a pressing mechanism on a conveying belt, when the diagonal saw cuts from top to bottom, the instantaneous longitudinal cutting force can cause the core layer plate to vibrate, so that lines or surfaces cut out from the cross section of the core layer plate are uneven, and the use of the plate is influenced; saw cut the garrulous saw-dust that produces and also can not in time clear up, not only pile up and influence the normal work of spreading machine below the conveying frame, still be unfavorable for the environment in factory.
SUMMERY OF THE UTILITY MODEL
The utility model provides a diagonal saw mechanism of a paving machine, aiming at the problems in the background technology.
The utility model is realized by the following technical scheme:
a diagonal saw mechanism of a paving machine comprises a conveying frame, a portal frame and a diagonal saw body, wherein a plurality of rotating shafts are rotatably arranged in the conveying frame at equal intervals, and a plurality of conveying wheels are fixed on the outer wall of each rotating shaft at equal intervals; conveying frame fixed mounting in the top of conveying frame, the inside slidable mounting of portal frame has the guide rail seat, the up end of guide rail seat with install a pair of electric cylinder between the portal frame, there is the slide guide bottom of guide rail seat through guide rail slidable mounting, the bottom fixed mounting of slide has the diagonal angle saw body, the inside of slide is run through and is provided with the screw rod, the screw rod is driven by servo motor, a pair of subassembly that compresses tightly is all installed to the left and right outer wall of the back timber of portal frame.
As a further improvement of the scheme, the pressing assembly comprises a support frame, a second electric cylinder, pressing legs and pressing rollers, the pressing legs are hinged to the support frame, and the pressing rollers are rotatably mounted at the bottom ends of the pressing legs.
As a further improvement of the scheme, the outer side wall of the pressing leg is provided with a rectangular groove, a hinge seat is fixed inside the rectangular groove, and the second electric cylinder is hinged and installed between the support frame and the hinge seat.
As a further improvement of the scheme, the conveying frame is further provided with a scrap cleaning assembly, and the scrap cleaning assembly is arranged right below the diagonal saw body.
As a further improvement of the above scheme, piece clearance subassembly includes a clearance section of thick bamboo and clearance motor, the upper end of a clearance section of thick bamboo is seted up jaggedly and the breach upper end is installed and is led the feed bin, install the preceding lateral wall of a clearance section of thick bamboo the clearance motor, the output of clearance motor is fixed with the clearance axle, the outer wall of clearance axle is fixed with the clearance silk that becomes spiral distribution.
As a further improvement of the scheme, a discharge hopper is arranged at a discharge port at the rear end of the cleaning barrel.
As a further improvement of the scheme, a plurality of belt pulleys are fixed on the outer wall of the rotating shaft and driven by a transmission belt.
As a further improvement of the above scheme, the sliding seat is in threaded connection with the screw rod.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the utility model, the left outer wall and the right outer wall of the top beam of the portal frame are respectively provided with a pair of compressing assemblies, each compressing assembly comprises a support frame, a second electric cylinder, a compressing leg and a compressing roller, and the extension or the shortening of the telescopic rod of the second electric cylinder can be controlled.
2. In the utility model, the conveying frame is also provided with a scrap cleaning assembly, the scrap cleaning assembly is arranged under the diagonal saw body and comprises a cleaning barrel and a cleaning motor, scrap wood generated when a core layer plate is sawed passes through the material guide bin under the action of gravity and falls into the cleaning barrel, the cleaning motor is started, the output end of the cleaning motor is fixed with a cleaning shaft, the outer wall of the cleaning shaft is fixed with cleaning wires distributed in a spiral manner, the outer end of the cleaning wires is in contact with the inner wall of the cleaning barrel, the cleaning motor drives the cleaning wires to rotate, the cleaning wires can push the scrap wood falling into the cleaning barrel to the outlet of the cleaning barrel while rotating, and finally the scrap wood is discharged from the discharge hopper and collected, on one hand, the scrap wood can be prevented from being accumulated below the conveying frame, the normal work of the paving machine is prevented from being influenced, meanwhile, the environment of a plant area is favorably improved, and the scrap wood is recovered, resource waste is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a perspective view of a first perspective of the present invention;
FIG. 2 is a perspective view of a second embodiment of the present invention;
FIG. 3 is a schematic structural view of a portal frame according to the present invention;
FIG. 4 is a schematic view of the construction of the hold-down assembly of the present invention;
FIG. 5 is a schematic view of the debris removal assembly of the present invention;
FIG. 6 is an exploded view of the debris removal assembly of the present invention.
The device comprises a conveying frame, a gantry, a 3-diagonal saw body, a 4-pressing assembly, a 401-supporting frame, 402-a second electric cylinder, 403-pressing legs, 404-pressing rollers, 405-a rectangular groove, 406-a hinged seat, 5-a rotating shaft, 6-a scrap cleaning assembly, 601-a cleaning barrel, 602-a cleaning motor, 603-a guide bin, 604-a cleaning shaft, 605-a cleaning wire, 606-a discharge hopper, 7-a conveying wheel, 8-a guide rail seat, 9-a first electric cylinder, 10-a sliding seat, 11-a screw rod, 12-a servo motor, 13-a belt pulley and 14-a transmission belt.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the utility model and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
The utility model is further described below with reference to the accompanying drawings.
A diagonal saw mechanism of a paving machine is shown in figures 1, 2 and 3 and comprises a conveying frame 1, a portal frame 2 and a diagonal saw body 3, wherein a plurality of rotating shafts 5 are rotatably arranged in the conveying frame 1 at equal intervals, and a plurality of conveying wheels 7 are fixed on the outer wall of each rotating shaft 5 at equal intervals; the portal frame 2 is fixedly arranged at the top end of the conveying frame 1, and the portal frame 2 and the core layer plate are arranged at a certain angle in the conveying direction, so that the conveying while sawing can be realized, the production efficiency can be improved while the sawing surface is kept vertical, a guide rail seat 8 is slidably arranged in the portal frame 2, a pair of first electric cylinders 9 is arranged between the upper end surface of the guide rail seat 8 and the portal frame 2, a sliding seat 10 is slidably arranged at the bottom end of the guide rail seat 8 through a guide rail, a diagonal saw body 3 is fixedly arranged at the bottom end of the sliding seat 10, the diagonal saw body 3 is the conventional equipment and is a common equipment for transversely cutting off continuous core layer plates on a straw plate production line, a screw rod 11 is arranged in the sliding seat 10 in a penetrating manner, the sliding seat 10 is in threaded connection with the screw rod 11, the screw rod 11 is driven by a servo motor 12, the servo motor 12 can drive the screw rod 11 to rotate forward and backward after being electrified, and can further drive the sliding seat 10 to move back and forth along the guide rail at the bottom end of the guide rail seat 8, a pair of compacting assemblies 4 are respectively arranged on the left outer wall and the right outer wall of the top beam of the portal frame 2; the outer wall of the rotating shaft 5 is further fixed with a plurality of belt pulleys 13, the belt pulleys 13 are driven by a transmission belt 14, and the transmission belt 14 can drive the rotating shaft 5 and the transmission wheel 7 to rotate so as to transmit the core layer plates.
As shown in fig. 1 and 4, the pressing assembly 4 includes a supporting frame 401, a second electric cylinder 402, a pressing leg 403 and a pressing roller 404, the pressing leg 403 is hinged to the supporting frame 401, and the pressing roller 404 is rotatably mounted at the bottom end of the pressing leg 403; rectangular channel 405 has been seted up to the lateral wall that compresses tightly leg 403, the inside of rectangular channel 405 is fixed with articulated seat 406, articulated the installing between support frame 401 and articulated seat 406 of second electric cylinder 402, the telescopic link extension or the shortening of steerable second electric cylinder 402, because articulated the installing of second electric cylinder 402 further can drive to compress tightly leg 403 clockwise or anticlockwise turn to certain angle between support frame 401 and articulated seat 406, compress tightly the bottom rotation of leg 403 and install pressure roller 404, diagonal angle saw is when cutting straw core plate, can make and compress tightly leg 403 and compress tightly the core plate, pressure roller 404 rolls at the core plate upper surface this moment and also can not influence the conveying of core plate.
As shown in fig. 1, 5 and 6, the conveying frame 1 is further provided with a debris cleaning assembly 6, and the debris cleaning assembly 6 is arranged right below the miter saw body 3; the debris cleaning assembly 6 comprises a cleaning barrel 601 and a cleaning motor 602, a gap is formed in the upper end of the cleaning barrel 601, a material guide bin 603 is arranged at the upper end of the gap, the cleaning motor 602 is arranged on the front side wall of the cleaning barrel 601, a cleaning shaft 604 is fixed at the output end of the cleaning motor 602, and cleaning wires 605 which are spirally distributed are fixed on the outer wall of the cleaning shaft 604; the rear end discharge gate of clearance section of thick bamboo 601 is equipped with out hopper 606, the piece collecting vessel has been placed to the below of play hopper 606, the garrulous saw-dust that produces when saw cutting the core plywood is through leading feed bin 603 under the action of gravity and inside the clearance section of thick bamboo 601 that falls, restart clearance motor 602, the output of clearance motor 602 is fixed with clearance axle 604, the outer wall of clearance axle 604 is fixed with the clearance silk 605 that becomes spiral distribution, the outer end and the clearance section of thick bamboo 601 inner wall of clearance silk 605 contact, and then clearance motor 602 drives clearance silk 605 and rotates, clearance silk 605 can be when the pivoted can be with dropping the inside garrulous saw-dust propelling movement of clearance section of thick bamboo 601 to the export of clearance section of thick bamboo 601, finally discharge and collect by a play hopper 606.
The working process of the utility model is as follows: starting a paving machine, feeding the core layer crushed aggregates into a paving forming machine through a paving measuring bin by metering, setting core layer plates with various densities, paving the core layer crushed aggregates into continuous core layer plate strips by the paving forming machine, uniformly paving the continuous core layer plate strips on a belt of a belt conveyor, and reaching the lower part of a portal frame 2 after continuous hot press forming; after the core plate reaches the position below the portal frame 2, the extension rod of the second electric cylinder 402 can be controlled to extend, and the second electric cylinder 402 is hinged between the support frame 401 and the hinge base 406 and further can drive the pressing roller 404 at the bottom end of the pressing leg 403 to rotate towards the upper surface of the core plate until the pressing leg 403 presses the core plate, so that the conveying of the core plate cannot be influenced when the pressing roller 404 rolls on the upper surface of the core plate; then a central control system of the paving machine controls a pair of first electric cylinders 9 to extend downwards, so that a guide rail seat 8, a sliding seat 10 and a diagonal saw body 3 can be driven to move downwards until a saw blade of the diagonal saw body 3 can completely saw the side surface of a core layer plate, then a servo motor 12 is controlled to drive a screw rod 11 to rotate clockwise, the sliding seat 10 can be driven to move forwards along a guide rail at the bottom end of the guide rail seat 8 until the whole core layer plate is cut off, a transmission belt 14 simultaneously conveys the core layer plate while cutting, and the portal frame 2 and the conveying direction of the core layer plate are arranged at a certain angle, so that the conveying while sawing can be realized, and the production efficiency can be improved while the vertical sawing surface is kept; after the sawing in the first period is finished, the central control system controls the pair of first electric cylinders 9 to contract upwards, namely, the guide rail seat 8, the sliding seat 10 and the diagonal saw body 3 are driven to move upwards, the servo motor 12 simultaneously drives the screw rod 11 to rotate anticlockwise in the upward movement process, the sliding seat 10 can be driven to move backwards along the guide rail at the bottom end of the guide rail seat 8 until the initial state is returned, and after the initial state is stopped for a certain time, the core plate is conveyed to the left for a set length, and then the sawing in the next period can be carried out.
According to the utility model, the extension or shortening of the telescopic rods of the four second electric cylinders 402 is directly controlled, so that the core layer plates can be flexibly pressed by the pressing assembly 4, the leveling of the sawing surfaces is ensured, and the core layer plates with different thicknesses can be sawed, thereby meeting the requirement of large-scale production of enterprises; in addition, the broken wood chips generated when the core layer plate is sawed pass through the material guide bin 603 under the action of gravity and fall into the cleaning barrel 601, the cleaning motor 602 is started again, the cleaning shaft 604 is fixed at the output end of the cleaning motor 602, the cleaning wires 605 distributed spirally are fixed on the outer wall of the cleaning shaft 604, the outer end of each cleaning wire 605 is in contact with the inner wall of the cleaning barrel 601, the cleaning motor 602 drives the cleaning wires 605 to rotate, the cleaning wires 605 can push the broken wood chips falling into the cleaning barrel 601 to the outlet of the cleaning barrel 601 while rotating, and finally the broken wood chips are discharged and collected by the discharge hopper 606.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (8)

1. The utility model provides a diagonal saw mechanism of spreading machine, includes transfer frame (1), portal frame (2) and diagonal saw body (3), its characterized in that: a plurality of rotating shafts (5) are rotatably arranged in the conveying frame (1) at equal intervals, and a plurality of conveying wheels (7) are fixed on the outer wall of each rotating shaft (5) at equal intervals; portal frame (2) fixed mounting in the top of conveying frame (1), the inside slidable mounting of portal frame (2) has guide rail seat (8), the up end of guide rail seat (8) with install a pair of electric cylinder (9) between portal frame (2), there is slide (10) bottom of guide rail seat (8) through guide rail slidable mounting, the bottom fixed mounting of slide (10) has diagonal saw body (3), the inside of slide (10) is run through and is provided with screw rod (11), screw rod (11) are driven by servo motor (12), a pair of subassembly (4) that compress tightly is all installed to the left and right outer wall of the back timber of portal frame (2).
2. The diagonal saw mechanism of a paving machine as recited in claim 1, further comprising: the pressing assembly (4) comprises a support frame (401), a second electric cylinder (402), pressing legs (403) and pressing rollers (404), the pressing legs (403) are hinged to the support frame (401), and the pressing rollers (404) are rotatably mounted at the bottom ends of the pressing legs (403).
3. The diagonal saw mechanism of a paving machine as recited in claim 2, further comprising: the outer side wall of the pressing leg (403) is provided with a rectangular groove (405), a hinge seat (406) is fixed inside the rectangular groove (405), and the second electric cylinder (402) is installed between the support frame (401) and the hinge seat (406) in a hinged mode.
4. The diagonal saw mechanism of a paving machine as recited in claim 1, further comprising: still install piece clearance subassembly (6) on conveying frame (1), piece clearance subassembly (6) set up in right below diagonal saw body (3).
5. The diagonal saw mechanism of a paving machine as recited in claim 4, further comprising: piece clearance subassembly (6) are including a clearance section of thick bamboo (601) and clearance motor (602), breach and breach upper end are seted up to the upper end of a clearance section of thick bamboo (601) and are installed guide feed bin (603), install the preceding lateral wall of a clearance section of thick bamboo (601) clearance motor (602), the output of clearance motor (602) is fixed with clearance axle (604), the outer wall of clearance axle (604) is fixed with into spiral distribution's clearance silk (605).
6. The diagonal saw mechanism of a paving machine as recited in claim 5, further comprising: a discharge hopper (606) is arranged at a discharge port at the rear end of the cleaning barrel (601).
7. The diagonal saw mechanism of a paving machine as recited in claim 1, further comprising: the outer wall of axis of rotation (5) is still fixed with a plurality of belt pulley (13), belt pulley (13) are by drive belt (14) drive.
8. The diagonal saw mechanism of a paving machine as recited in claim 1, further comprising: the sliding seat (10) is in threaded connection with the screw (11).
CN202121507434.2U 2021-07-05 2021-07-05 Diagonal saw mechanism of paving machine Active CN215549345U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121507434.2U CN215549345U (en) 2021-07-05 2021-07-05 Diagonal saw mechanism of paving machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121507434.2U CN215549345U (en) 2021-07-05 2021-07-05 Diagonal saw mechanism of paving machine

Publications (1)

Publication Number Publication Date
CN215549345U true CN215549345U (en) 2022-01-18

Family

ID=79823216

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202121507434.2U Active CN215549345U (en) 2021-07-05 2021-07-05 Diagonal saw mechanism of paving machine

Country Status (1)

Country Link
CN (1) CN215549345U (en)

Similar Documents

Publication Publication Date Title
CN113478587B (en) Plank chamfering equipment for wood processing
CN216831392U (en) Edge cutting device for fiberboard
CN215549345U (en) Diagonal saw mechanism of paving machine
CN214687042U (en) Plate connecting machine
CN112895035A (en) Comb tooth wood connecting machine
CN210500681U (en) Reciprocating transverse device for efficient processing of bamboo wood
CN209794035U (en) Saw-dust system stick equipment convenient to maintain
CN109434957B (en) Triangular batten cutting equipment for furniture
CN218195715U (en) Automatic batten connecting, forming and conveying device
CN111319110B (en) Plank cuts section equipment
CN213762156U (en) Waste wood material crushing and recycling device
CN210910376U (en) Timber core strip cutting machine of wood-based plate processing usefulness
CN212948298U (en) Plank cuts and cuts open piece equipment
CN201385344Y (en) Veneer-overlapping guillotine shear
CN214262199U (en) Raw material forming device is used in production of mechanism charcoal
CN110744644B (en) Automatic edge cutting machine for composite board and working method thereof
CN2801438Y (en) Plaster spreading machine
CN209831968U (en) Bamboo fluffer
CN219132589U (en) Wood core cutting device
CN216884458U (en) Round bamboo sheet shaving machine
CN108032379A (en) Medium density fibre board (MDF) edging and trimming saw
CN219485962U (en) Material distributing and pressing wheel driving conveying mechanism
CN220830895U (en) Straw cutting machine laser positioning device
CN111469218A (en) Rotary cutting board cutter roller type chipper
CN215943267U (en) Blank pressing device for density fiberboard prepressing

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant