Method and apparatus for continuous flat pressing of plywood

Abstract

The application provides a plywood continuous flat pressing production method and equipment, and relates to the field of production planning. n , a plurality of simulation board blanks are obtained by selecting n a plurality of veneers according to a preset group blank logic in the optional veneers; S2: at least one thickness index of each simulation board blank is calculated, and a candidate board blank is determined; S3: a head-tail thickness deviation value of all candidate board blanks and the latest to-be-processed board blank is calculated, and one candidate board blank meeting the minimum head-tail thickness deviation value is taken as a new to-be-processed board blank; and the veneers constituting the to-be-processed board blank are deleted from the optional veneers; S4: according to the front-back sequence of the to-be-processed board blank, the new to-be-processed board blank is positioned and physically grouped; S5: new supplemented veneers are obtained, and the new supplemented veneers, the veneers in the remaining candidate board blanks and the veneers not constituting the candidate board blanks are all taken as optional veneers, and the step S1 is returned; and the process is terminated until the termination.

Description

Technical Field

[0001] This invention relates to the field of production planning, and in particular to a method and equipment for continuous flat pressing production of plywood. Background Technology

[0002] As an important carrier of structural materials, the level of plywood production technology is directly related to the progress of industrial upgrading.

[0003] Plywood production typically involves shaping, drying, and gluing veneers of uniform size sequentially, then stacking them perpendicularly and alternately along the grain to form a board blank, followed by hot pressing to cure the adhesive and create the finished product. Currently, the industry commonly uses multi-layer flat presses for intermittent hot pressing production.

[0004] However, with the increasing demands for production efficiency and product quality, the industry has begun to explore the use of continuous flat-press hot pressing for plywood production. However, due to the significant anisotropy of wood, veneers exhibit natural differences in thickness, moisture content, and density, making it difficult to achieve stable board feeding during continuous assembly. To adapt to the operational requirements of continuous presses, existing technologies typically still employ a method of connecting standard-compliant boards end-to-end and feeding them intermittently. This feeding logic is similar to the intermittent operation of traditional multi-layer presses, failing to fully realize the potential of continuous production.

[0005] Furthermore, in actual production, veneers conforming to national standards are often randomly stacked to form blanks. This practice easily leads to two key quality defects: first, the thickness deviation between veneers in each layer within the blank exceeds 8%; second, the overall thickness difference between adjacent blanks exceeds 8%.

[0006] For multi-layer presses, the thickness deviation inside the slab directly affects the compression rate control during the hot pressing process, which can easily cause problems such as local over-pressure (leading to hard and brittle boards, deformation, and material waste) or under-pressure (causing hollow areas, lack of interlayer bonding, and insufficient bonding strength), seriously affecting the physical properties and appearance quality of plywood.

[0007] For continuous flat-press hot presses, although their flexible hot press plate structure can alleviate the impact of thickness fluctuations inside the slab to some extent, due to the overall rigidity of the system, sudden changes in thickness between slabs will significantly impact the stability of the steel strip operation and the uniformity of the hot press plate stress. This not only aggravates equipment wear, but may even cause faults such as steel strip deviation and hot press plate deformation. Long-term operation will seriously affect the equipment life and production continuity.

[0008] Chinese patent CN101508128B discloses a "method for pressing pressed products using a continuous press and equipment for implementing the method." The method includes: detecting the thickness of a slab on a conveyor belt; comparing the detected slab thickness value with a predetermined slab thickness value to determine the starting point position of the conveyor belt relative to the feed inlet with a fixed curved shape on the press, and the pressing gap between the upper and lower hot pressing plates of the press; and controlling the conveyor belt drive device via a control system to move the conveyor belt so that its front end reaches the aforementioned starting point position, and controlling the press control cylinder to adjust the pressing gap between the upper and lower hot pressing plates of the continuous flat press to a predetermined value. According to this method, high-quality pressed sheets can be produced at high speed. However, the aforementioned patent only determines and adjusts the parameters of the pressing equipment based on the slab thickness value, and does not involve using the slab thickness value for blank selection, controlling the slab thickness to be nearly uniform, and eliminating defects caused by thickness deviations. Summary of the Invention

[0009] To address the technical problems existing in the prior art, the present invention aims to provide a continuous flat pressing production method and equipment for plywood, which effectively controls the consistency of slab thickness while ensuring production efficiency, eliminates defects such as over-pressing, under-pressing, and hollowing caused by thickness deviation, and reduces damage to key components of the continuous press.

[0010] To achieve the above-mentioned objectives, this invention provides a continuous flat-press production method for plywood, comprising the following steps: S1: Based on the number of veneer layers required for the slab. n Select from the available single plates according to the preset assembly logic. n Multiple simulated slab blanks were obtained by simulating the assembly of single-layer slabs; among them n ≥2, and the number of selectable single boards is greater than n ; S2: Calculate at least one thickness index for each simulated slab and determine the simulated slabs whose thickness indexes meet the corresponding thickness preset conditions as candidate slabs. The thickness parameters include the average thickness and thickness deviation of the simulated slab. The average thickness of the simulated slab is an arithmetic average calculated based on the thickness of the simulated slab at each thickness measurement point and the number of thickness measurement points. The thickness of the simulated slab at each thickness measurement point is obtained by summing the thicknesses of all the individual plates that make up the simulated slab at each thickness measurement point. The thickness deviation value of the simulated slab is the maximum value of the thickness difference between any two thickness measurement points on the simulated slab. S3: Calculate the first and last thickness deviation values ​​between all candidate slabs and the latest slab to be processed, and take the candidate slab with the smallest first and last thickness deviation value as the new slab to be processed; and delete the single plates that make up the slab to be processed from the optional single plates; The initial blanks to be processed are selected from the first group of candidate blanks based on the set selection criteria; S4: According to the front and back order of the blanks to be processed, the new blanks to be processed are positioned and physically assembled for subsequent flat pressing production of plywood. S5: Obtain the newly added single board, and treat the newly added single board, the single boards in the remaining candidate slabs, and the single boards that do not form a candidate slab as optional single boards, and return to step S1; until the set termination condition is reached. The number of newly added boards is greater than or equal to 0.

[0011] According to one technical solution of the present invention, in S3, the process of obtaining the thickness deviation value at the beginning and end is as follows: S31: Calculate the average thickness at the first end based on the thickness at the thickness measurement point located at the first end of the simulated slab and the number of such thickness measurement points; The average thickness at the tail end is calculated based on the thickness at the thickness measurement point located at the tail end of the simulated slab and the number of such thickness measurement points. S32: The difference between the average thickness of the tail end of the latest blank to be processed and the average thickness of the head end of the candidate blank is taken as the absolute value to obtain the head-tail thickness deviation value.

[0012] According to one technical solution of the present invention, S5 further includes: The cumulative number of time-stuck single boards is calculated, and if the number of time-stuck single boards exceeds a set threshold, the corresponding time-stuck single board is deleted from the selectable single boards. The retained slabs are slabs from the remaining candidate slabs and slabs that did not form candidate slabs; The number of retention rounds is the total number of rounds in which a single board continuously becomes a retention single board.

[0013] The present invention also provides a continuous flat pressing production equipment for plywood, comprising: The grasping and measuring unit is used to grasp single boards, transport and place them in the board storage area, and obtain the number of the single board and the location of the board storage area; and to measure the thickness of the single board at each thickness measuring point; The number of storage plate areas is: m indivual, m ≥ n Furthermore, each storage area can have at most one single board. The simulation assembly unit is used to determine the number of veneer layers required for the desired slab. n Select from the available single boardsn Zhang Danban was used for simulated assembly of blanks; Based on the thickness index and preset thickness conditions of the simulated slab, slabs to be processed are selected from the simulated slab group, and the slabs to be processed are sorted according to their sequential order. The average thickness of the simulated slab is an arithmetic average calculated based on the thickness of the simulated slab at each thickness measurement point and the number of thickness measurement points. The thickness of the simulated slab at each thickness measurement point is obtained by summing the thicknesses of all the individual plates that make up the simulated slab at each thickness measurement point. The thickness deviation value of the simulated slab is the maximum value of the thickness difference between any two thickness measurement points on the simulated slab. The grabbing and transporting unit is used to retrieve single boards from the storage area according to the arrangement order of the single boards in the slab to be processed, the corresponding single board number, and the location of the storage area; and to stack them on the single board input mechanism according to the arrangement order of the single boards in the slab to be processed to form the slab to be processed.

[0014] According to one technical solution of the present invention, the simulation assembly unit is also used to accumulate the number of retention wheels of the retained single plate, and when the number of retention wheels exceeds a set wheel number threshold, delete the corresponding retained single plate from the selectable single plates and generate a retained single plate removal command. The retained slabs are slabs from the remaining candidate slabs and slabs that did not form candidate slabs; The number of retention rounds is the total number of rounds in which a single board continuously becomes a retention single board; The billet handling unit is also used to respond to the instruction to remove the retained single board and remove the retained single board from the storage area according to the location of the retained single board in the storage area.

[0015] According to one technical solution of the present invention, the continuous flat pressing production equipment for plywood further includes: The billet assembly database unit is used to add the number of the single plate, the location of the storage area, and the thickness of the single plate at each thickness measurement point when the single plate is placed in the storage area. It is also used to delete the number of the single board, the location of the storage area, and the thickness of the single board at each thickness measurement point when the single board is removed from the storage area.

[0016] According to one technical solution of the present invention, the grasping and measuring unit includes: A movable first carrier, with at least one first vacuum suction cup and multiple retractable thickness detection rods connected to its lower part; the multiple retractable thickness detection rods correspond to the positions of each thickness measurement point on the single board; Testing platform; the upper surface of the testing platform is used as a reference surface and a single plate is placed on it. The thickness of the single plate at each measuring point is measured by a displacement thickness measurement method using multiple thickness measuring rods. The probe displacement measurement unit is used to obtain the amount of expansion and contraction displacement of the probe of each thickness.

[0017] According to one technical solution of the present invention, the billet handling and assembly unit includes: A movable second carrier, with at least one second vacuum suction cup connected to its lower part.

[0018] According to one technical solution of the present invention, the continuous flat pressing production equipment for plywood further includes: With m A storage platform for each workstation, and the storage platform of m Each workstation serves as a storage area.

[0019] The present invention also provides an electronic device, comprising: one or more processors, one or more memories, and one or more computer programs; wherein the processor is connected to the memory, and the one or more computer programs are stored in the memory. When the electronic device is running, the processor executes the one or more computer programs stored in the memory to cause the electronic device to perform the above-described continuous flat pressing production method for plywood.

[0020] The present invention also provides a computer-readable storage medium for storing computer instructions, which, when executed by a processor, implement the above-described continuous flat-press production method for plywood.

[0021] The continuous flat pressing method and equipment for plywood production of the present invention have the following advantages compared with the prior art: 1. By optimizing the plywood assembly strategy and thickness matching control, the thickness deviation within and between slabs is effectively reduced, avoiding defects such as over-compression, under-compression, hollowing, and interlayer delamination caused by uncontrolled compression rate, ensuring that the plywood has uniform density, dense structure, high bonding strength, and stable and reliable overall quality.

[0022] 2. Overcoming the limitations of "intermittent plate feeding", it supports intelligent matching and complementary assembly of single plates of different thicknesses and specifications, enabling the slabs to enter the continuous flat press smoothly and continuously, giving full play to the advantages of the continuous press in terms of capacity, energy consumption and automation.

[0023] 3. Allow some veneers that do not meet the standard thickness to participate in the production process by combining thick and thin veneers and using complementary methods, so as to reduce the waste of high-quality timber resources and lower raw material costs.

[0024] 4. By controlling the fluctuation of slab thickness, the impact and uneven wear on core components such as the steel strip and hot platen of the continuous press are reduced, the service life of the equipment is extended, the maintenance frequency and operating costs are reduced, and the long-term stable operation of the production line is ensured. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0026] Figure 1 A flowchart illustrating a continuous flat-press production method for plywood according to an embodiment of the present invention is shown. Figure 2 This schematic diagram illustrates the structure of a continuous flat pressing production equipment for plywood according to one embodiment of the present invention. Figure 3 This diagram schematically illustrates the electrical structure of a continuous flat-press plywood production equipment according to one embodiment of the present invention. Figure 4 This schematic diagram illustrates the structure of a gripping and measuring unit in a continuous plywood flat pressing production equipment according to an embodiment of the present invention. Figure 5 This diagram schematically illustrates the structure of a plywood continuous flat pressing production equipment according to an embodiment of the present invention, specifically a plywood handling and assembly unit. Detailed Implementation

[0027] The description of the embodiments in this specification should be taken in conjunction with the accompanying drawings, which should form part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and may be indicated in a simplified or convenient manner. Furthermore, parts of the various structures in the drawings will be described separately; it is worth noting that elements not shown in the figures or not described in words are in a form known to those skilled in the art.

[0028] The descriptions of the embodiments herein, including any references to directions and orientations, are for ease of description only and should not be construed as limiting the scope of the invention. The following description of preferred embodiments involves combinations of features, which may exist independently or in combination; the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.

[0029] like Figures 1-5 As shown, the present invention provides a continuous flat-press production method for plywood, characterized by the following steps: S1: Based on the number of veneer layers required for the slab. n Select from the available single plates according to the preset assembly logic. n Multiple simulated slab blanks were obtained by simulating the assembly of single-layer slabs; among them n ≥2, and the number of selectable single boards is greater than n ; S2: Calculate at least one thickness index for each simulated slab and determine the simulated slabs whose thickness indexes meet the corresponding thickness preset conditions as candidate slabs. The thickness parameters include the average thickness and thickness deviation of the simulated slab; The average thickness of the simulated slab is an arithmetic average calculated based on the thickness of the simulated slab at each thickness measurement point and the number of thickness measurement points. The thickness of the simulated slab at each thickness measurement point is obtained by summing the thicknesses of all the individual plates that make up the simulated slab at each thickness measurement point. The thickness deviation value of the simulated slab is the maximum value of the thickness difference between any two thickness measurement points on the simulated slab. S3: Calculate the first and last thickness deviation values ​​between all candidate slabs and the latest slab to be processed, and select the candidate slab with the smallest first and last thickness deviation value as the new slab to be processed; and delete the single plates that make up the slab to be processed from the optional single plates. The initial blanks to be processed are selected from the first group of candidate blanks based on the set selection criteria; S4: According to the front and back order of the blanks to be processed, the new blanks to be processed are positioned and physically assembled for subsequent flat pressing production of plywood. S5: Obtain the newly added single board, and treat the newly added single board, the single boards in the remaining candidate slabs, and the single boards that do not form a candidate slab as optional single boards, and return to step S1; until the set termination condition is reached. The number of newly added boards is greater than or equal to 0.

[0030] In this embodiment, the required number of single-layer slabs for the required slab blank n This refers to the number of veneer layers in the plywood blank to be produced based on process requirements, etc. The number of selectable veneer layers should generally be greater than 2. n This ensures that sufficient spare capacity is reserved during the production of plywood.

[0031] like Figure 2 As shown, the thickness of each veneer is digitized, totaling... n The thickness data of both horizontal and vertical striped veneers are stored in a dynamic database.

[0032] All veneers are combined according to the thickness data of the production process and the stacking order of the longitudinal and transverse grains to simulate the blank assembly. There are two types of veneers: Type I veneers and Type II veneers. For example, transverse grain veneers and vertical grain veneers are stacked in different positions during the simulated blank assembly based on process design requirements.

[0033] In the case of two different types of single boards, from m Of the (even) number of selectable boards, the quantity of each type of board is... m / 2, select n By alternately stacking and combining single-layer boards, the following number of combinations of simulated slab blanks are obtained: Based on the above number of simulated slabs, the slabs to be processed are obtained by screening according to the screening conditions.

[0034] For example, if the process requires the plywood to have a three-layer structure from bottom to top: horizontal grain, vertical grain, and horizontal grain again.

[0035] Each has 10 vertical stripe veneers and 10 horizontal stripe veneers. m =20, n =3) Optional single slabs. Assume the horizontal stripe slab numbers are: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9; and the vertical stripe slab numbers are: a, b, c, d, e, f, g, h, j, k. Then the total number of simulated slabs formed by combining them are 0a1, 0b1……0k1; 0a2, 0b2……0k2; 0a3, 0b3……0k3……up to 9k8.

[0036] Due to the anisotropy of wood, excessive variations within the veneer can lead to uneven thickness, affecting the precision and bonding of subsequent processing and increasing the difficulty of product quality control. Therefore, selecting the veneer blank from the simulated blank assembly mainly involves two parameters: (1) Reasonable slab thickness, (2) For slabs connected end to end, the thickness deviation between adjacent ends is within a reasonable range.

[0037] Specifically, the thickness of all single plates is calculated, the thickness of single plates at the same position is accumulated, and the average of the accumulated thickness of multiple points (9 points) within the same slab is taken (i.e. the average thickness of the simulated slab). The simulated slab with the average value closest to the nominal thickness within a certain range is selected and denoted as set A. The slabs in set A above are preferably those with a thickness deviation (thickness deviation value of simulated slabs) within a certain range, and are denoted as set B. Then, all simulated slabs in set B are candidate slabs.

[0038] Based on the above conditions, and further optimized by the thickness difference between the tail of the front slab and the head of the rear slab (thickness deviation value between the front and rear), the simulated slab is solidified and transformed into a slab to be processed. It is then arranged on the billet conveyor behind the previous slab to be processed, and the process is repeated in sequence.

[0039] In the above cycle, referring to the simulation billet assembly results, the corresponding single plate is captured and actually assembled into a billet to be processed. Then, the single plate data of the completed billet assembly (bill to be processed) is deleted from the dynamic database, and new single plate data is added to the dynamic database, and so on.

[0040] During the above cycle, after a slab to be processed is added to the billet conveyor, a new slab can be added (since the storage platform is empty).

[0041] Before the second iteration in the above cyclic process, the following first or second iteration continuation conditions can be adopted as needed: 1. Regardless of whether new single plates are added, the newly added slabs (if the number of newly added single plates is 0, it can be regarded as no new single plates), the single plates in the remaining candidate slabs, and the single plates that are not used to form candidate slabs can all be used as optional single plates and participate in the simulation assembly again to obtain a new batch of simulation slabs.

[0042] Second, without the need for additional slabs, there is no need to re-simulate. Simply delete candidate slabs that include slabs from the previous slab to be processed (i.e., at least one slab in the candidate slab has already been used by the previous slab to be processed, and even if all screening conditions are met, a specific slab to be processed cannot be formed). Directly calculate the first and last thickness deviation values ​​(because the candidate slabs are simulation slabs that already meet the simulation slab thickness indicators) to determine the slab to be processed.

[0043] When new boards are added, the loop can only be executed according to the first loop continuation condition. However, when no new boards are added, the loop can be executed arbitrarily according to the first and second loop continuation conditions, even randomly, repeatedly, or alternately. Before the above loop begins, the selection condition for choosing the initial blank to be processed from the candidate blanks can be random selection, using a virtual + greedy algorithm (assuming that the "tail thickness of the last blank to be processed" in the previous shift or batch is known, treating this "last blank to be processed" as the "virtual front blank", and then selecting the candidate blank with the closest head thickness as the "initial blank to be processed" for this time), using median selection (selecting candidate blanks whose tail thickness is in the middle of all tail thicknesses and head thicknesses), or using high-frequency value selection (statistically counting the frequency of each "tail thickness" value and selecting candidate blanks with high-frequency "tail thickness" values), etc.

[0044] The termination conditions can include reaching the required number of plywood boards to be processed, or the absence of simulated board blanks that meet the screening criteria.

[0045] In this embodiment, the single board is 2450mm long and 1230mm wide. The thickness deviation between the first and last ends of adjacent slabs to be processed is ≤2% or 0.06mm (whichever is greater). The thickness deviation between any two single boards within the simulated slab is ≤5%.

[0046] The calculation process for the average thickness of the simulated slab is as follows: The surface of a single slab can be divided into multiple regions (e.g., 9 regions of 3×3). Each region serves as a thickness measurement area or point for the slab. The thickness measured at each measurement point represents the thickness of the slab at that point. For the simulated slab composed of slabs with these thickness measurement points, the position of each measurement point corresponds to the position and number of measurement points on each slab. Therefore, by summing the thicknesses at the corresponding measurement points of the n slabs that make up the simulated slab, the thickness of the simulated slab at each measurement point is obtained. The sum of the thicknesses at all measurement points is then divided by the number of measurement points to obtain the average thickness of the simulated slab at each measurement point, which is the average thickness of the simulated slab.

[0047] If the average thickness is used to screen the simulated slab blanks, the corresponding preset condition for thickness can be whether the average thickness is close to a certain range of the nominal thickness (which can be set based on actual production needs). If the average thickness of a simulated slab blank meets the requirement of being close to a certain range of the nominal thickness, then the simulated slab blank is confirmed as a candidate slab blank (or is left for further screening).

[0048] The calculation process for the thickness deviation of the simulated slab is as follows: After obtaining the thickness of the simulated slab at each thickness measurement point, calculate the difference between the thicknesses at any two thickness measurement points, and take the largest difference as the thickness deviation of the simulated slab.

[0049] If the simulated slab is selected based on its thickness deviation value, the corresponding preset thickness condition can be whether the thickness deviation value is within a certain range (which can be set based on actual production needs). If a simulated slab (or a simulated slab selected in the previous step) meets the requirement that its thickness deviation value is within a certain range, then the simulated slab is confirmed as a candidate slab.

[0050] The above-mentioned screening criteria for average thickness and thickness deviation can be used as screening criteria for simulated slabs, or they can be used in combination based on actual needs.

[0051] In S3, the process of obtaining the thickness deviation values ​​at the beginning and end is as follows: S31: Calculate the average thickness at the first end based on the thickness at the thickness measurement point located at the first end of the simulated slab and the number of thickness measurement points; The average thickness at the tail end is calculated based on the thickness at the thickness measurement point located at the tail end of the simulated slab and the number of thickness measurement points. S32: Subtract the average thickness of the tail end of the latest slab to be processed from the average thickness of the head end of the candidate slab and take the absolute value to obtain the head-tail thickness deviation value.

[0052] In this embodiment, multiple thickness measuring points are divided on the single board, and the corresponding positions of the candidate slab / slab to be processed composed of the single boards are also thickness measuring points. The thickness measuring points are defined as those located 1 / [the distance between the first and last 1 / 2] of the candidate slab / slab to be processed. k The position is at the beginning of the candidate slab / slab to be processed, located at the end of the candidate slab / slab to be processed. k The location is the tail end of the candidate slab / slab to be processed.

[0053] For example, if the candidate slab is divided into 3×3 thickness measurement points, then the first 1 / 3 of the candidate slab is the beginning of the candidate slab, and the last 1 / 3 of the candidate slab is the end of the candidate slab.

[0054] By selecting the candidate slab with the smallest thickness deviation between the beginning and end of the last slab to be processed from the existing candidate slabs as the new slab to be processed, based on a greedy algorithm, the processing continuity is improved, and the difference in thickness transition between adjacent slabs can be effectively reduced, thereby reducing equipment wear or product quality fluctuations caused by sudden thickness changes during the production process.

[0055] S5 also includes: The cumulative number of time cycles for a single board is accumulated, and if the number of time cycles exceeds the set threshold, the corresponding board is deleted from the available boards. The retained veneers are the veneers in the remaining candidate slabs and the veneers that did not form a candidate slab. The number of rounds in which a single board is continuously in a round is the sum of the number of rounds in which a single board becomes a single board in a round.

[0056] In this embodiment, if a single board is stuck in the first round of its cycle (without ultimately forming a slab to be processed), the single board is marked as a stuck single board. If the stuck single board is selected to form a slab to be processed within a set number of rounds threshold, it is deleted from the selectable single boards (thus, the stuck single board no longer exists). If the set number of rounds threshold is exceeded, it indicates that the thickness of the stuck single board may be defective, making it impossible to form a slab to be processed with other single boards within the number of rounds threshold, and it needs to be deleted.

[0057] The set number of rounds threshold should be consistent with m (Optional number of veneers) and the number of veneer layers in the slab. n Related, that is: in, TTo set a threshold for the number of rounds, b This is a buffer value, with a default value of 2.

[0058] This invention provides a continuous flat pressing production equipment for plywood, comprising: The grasping and measuring unit 1 is used to grasp the single board, transport and place it in the storage area, and obtain the single board number and the location of the storage area; and to measure the thickness of the single board at each thickness measuring point. The number of storage plate areas is m indivual, m ≥ n Furthermore, each storage area can have at most one single board. Simulation assembly unit 2 is used to determine the number of slab layers required for the desired slab. n Select from the available single boards n Zhang Danban was used for simulated assembly of blanks; Based on the thickness index and preset thickness conditions of the simulated slab, the slab to be processed is selected from the simulated slab assembly, and the slab to be processed is sorted according to the order of the slabs to be processed. The average thickness of the simulated slab is an arithmetic average calculated based on the thickness of the simulated slab at each thickness measurement point and the number of thickness measurement points. The thickness of the simulated slab at each thickness measurement point is obtained by summing the thicknesses of all the individual plates that make up the simulated slab at each thickness measurement point. The thickness deviation value of the simulated slab is the maximum value of the thickness difference between any two thickness measurement points on the simulated slab. The grabbing and transporting unit 3 is used to take out single plates from the storage area according to the arrangement order of the single plates in the slab to be processed, the corresponding single plate number and the location of the storage area; and stack them on the single plate input mechanism according to the arrangement order of the single plates in the slab to be processed to form the slab to be processed.

[0059] In this embodiment, such as Figure 2 and Figure 3 As shown, it includes a data processing computer, two single-board stacking platforms 7, two gripping and measuring units 1 (one horizontal stripe single board and one vertical stripe single board), two gripping and transporting assembly units 3 (one horizontal stripe single board and one vertical stripe single board), and one assembly conveyor 6.

[0060] Among them, the data processing computer is used as the simulation assembly unit 2, which is equipped with the corresponding program of the continuous flat pressing production method of plywood. It is used to execute the continuous flat pressing production method of plywood, store relevant data, and control the operation of the gripping and measuring unit 1 and the gripping and transporting assembly unit 3.

[0061] Two veneer stacking platforms 7 respectively place horizontal and vertical striped veneers; two gripping and measuring units 1 respectively transport and place horizontal and vertical striped veneers in the veneer storage area, and obtain the veneer number and storage area location; and measure the thickness of the veneer at each thickness measuring point; two gripping and transporting assembly units 3 respectively take out veneers from the horizontal and vertical striped veneer storage areas and transport them to the assembly conveyor 6 of the flat press, and then flat press to obtain plywood.

[0062] Specifically, simulation assembly unit 2 performs the following steps: S1: Based on the number of veneer layers required for the slab. n Select from the available single plates according to the preset assembly logic. n Multiple simulated slab blanks were obtained by simulating the assembly of single-layer slabs; among them n ≥2, and the number of selectable single boards is greater than n ; S2: Calculate at least one thickness index for each simulated slab and determine the simulated slabs whose thickness indexes meet the corresponding thickness preset conditions as candidate slabs. The thickness parameters include the average thickness and thickness deviation of the simulated slab; The average thickness of the simulated slab is an arithmetic average calculated based on the thickness of the simulated slab at each thickness measurement point and the number of thickness measurement points. The thickness of the simulated slab at each thickness measurement point is obtained by summing the thicknesses of all the individual plates that make up the simulated slab at each thickness measurement point. The thickness deviation value of the simulated slab is the maximum value of the thickness difference between any two thickness measurement points on the simulated slab. S3: Calculate the first and last thickness deviation values ​​between all candidate slabs and the latest slab to be processed, and select the candidate slab with the smallest first and last thickness deviation value as the new slab to be processed; and delete the single plates that make up the slab to be processed from the optional single plates. The initial blanks to be processed are selected from the first group of candidate blanks based on the set selection criteria; In S3, the process of obtaining the thickness deviation values ​​at the beginning and end is as follows: S31: Calculate the average thickness at the first end based on the thickness at the thickness measurement point located at the first end of the simulated slab and the number of thickness measurement points; The average thickness at the tail end is calculated based on the thickness at the thickness measurement point located at the tail end of the simulated slab and the number of thickness measurement points. S32: Subtract the average thickness of the tail end of the latest slab to be processed from the average thickness of the head end of the candidate slab and take the absolute value to obtain the head-tail thickness deviation value.

[0063] S4: Sort the slabs to be processed according to their front-to-back order; and according to the arrangement order of the slabs and the position of the corresponding slab storage area, control the grabbing and transporting unit 3 to take out the slabs from the storage area and transport them to the slab input mechanism (slab transporter 6) of the flat press.

[0064] S5: Obtain the newly added single board, and treat the newly added single board, the single boards in the remaining candidate slabs, and the single boards that do not form a candidate slab as optional single boards, and return to step S1; until the set termination condition is reached. The number of newly added boards is greater than or equal to 0.

[0065] Furthermore, S5 also includes: The cumulative number of time cycles for a single board is accumulated, and if the number of time cycles exceeds the set threshold, the corresponding board is deleted from the available boards. The retained veneers are the veneers in the remaining candidate slabs and the veneers that did not form a candidate slab. The number of rounds in which a single board is continuously in a round is the sum of the number of rounds in which a single board becomes a single board in a round.

[0066] The simulation assembly unit 2 is also used to accumulate the number of stranded wheels of the stranded single plate, and when the number of stranded wheels exceeds the set wheel threshold, delete the corresponding stranded single plate from the selectable single plates and generate a stranded single plate removal command. The retained veneers are the veneers in the remaining candidate slabs and the veneers that did not form a candidate slab. The number of rounds in which a single board is continuously retained is the sum of the number of rounds in which a single board is retained. The billet handling unit 3 is also used to respond to the instruction to remove the stuck single board and remove the stuck single board from the storage area according to the location of the stuck single board in the storage area.

[0067] In this embodiment, when a single board is stuck in the first round of its cycle (without ultimately forming a slab to be processed), the single board is marked as a stuck single board. If the stuck single board is selected to form a slab to be processed within a set number of rounds threshold, it is deleted from the selectable single boards (thus, the stuck single board no longer exists). If the set number of rounds threshold is exceeded, it indicates that the thickness of the stuck single board may be defective, making it impossible to form a slab to be processed with other single boards within the number of rounds threshold. It needs to be deleted, and the stuck single board is removed by the grabbing and conveying unit 3, thereby freeing up the storage area for newly added single boards.

[0068] The continuous flat pressing equipment for plywood also includes: The billet assembly database unit 4 is used to add the number of the billet, the location of the storage area, and the thickness of the billet at each thickness measurement point when the billet is placed in the storage area. It is also used to delete the board number, the location of the storage area, and the thickness of the board at each thickness measurement point when the board is removed from the storage area.

[0069] In this embodiment, the computer for data processing includes a simulation billet assembly unit 2 and a billet assembly database unit 4. The billet assembly database unit 4 is a dynamic database used to store and delete relevant data.

[0070] The thickness of each veneer is digitized. m The thickness data and position information of the horizontal and vertical striped single plates (on the storage plate area) are placed in the billet assembly database unit 4. After the billet to be processed is obtained by simulation assembly, the single plate data that makes up the billet to be processed is deleted from the billet assembly database unit 4, and new single plate data is added to the database, and so on.

[0071] Meanwhile, during the simulation billet assembly process, billet assembly database unit 4 is also used to store the thickness index of the simulated slab and delete the remaining thickness index after each cycle.

[0072] In the continuous flat pressing equipment for plywood production, the gripping and measuring unit 1 includes: A movable first carrier 1-1 is connected to at least one first vacuum suction cup 1-2 and multiple retractable thickness detection rods 1-3 below the first carrier 1-1; the multiple retractable thickness detection rods 1-3 correspond to the positions of each thickness measurement point on the single board. Inspection platform 1-4; The upper surface of inspection platform 1-4 serves as a reference surface and a single plate is placed on it. The thickness of the single plate at each measuring point is measured by multiple thickness measuring rods 1-3 using the displacement thickness measurement method. The displacement measurement unit 1-5 is used to obtain the displacement of each thickness detection rod 1-3.

[0073] In this embodiment, such as Figure 4 As shown, the first carrier 1-1 of the grasping and measuring unit 1 is equipped with nine first vacuum suction cups 1-2, nine displacement sensor thickness measuring components (thickness detection rod 1-3 and detection rod displacement measuring unit 1-5), a walking mechanism, and an alignment mechanism, etc.

[0074] The first vacuum suction cup 1-2 is used to pick up the single board confirmed to be on the single board stacking platform 7 by suction; the walking mechanism can adopt a hoisting track, which can drive the first carrier 1-1 to move to the corresponding position (single board stacking platform 7 or storage area) under the control of the simulation assembly unit 2; the alignment mechanism can adopt a cylinder driven positioning baffle assembly, which can perform edge alignment calibration of the picked single board through the extension and retraction of the baffle.

[0075] Thickness detection rods 1-3 are fixed by guide sleeves, etc., and can move up and down with power.

[0076] The upper surface of the detection platform 1-4 is used as the detection plane and is considered as an ideal plane. Furthermore, when the first carrier 1-1 is located at a set height above the detection platform 1-4 and one end of each of the multiple retractable thickness detection rods 1-3 is in contact with the upper surface of the detection platform 1-4, the retraction displacement of the thickness detection rods 1-3 is calibrated to zero.

[0077] The height of the first vacuum suction cup 1-2 is fixed or can be moved up and down, but at least when the thickness measuring rod 1-3 is measuring the thickness, the height of the first vacuum suction cup 1-2 should allow sufficient displacement margin for the thickness measuring rod 1-3.

[0078] The specific process of the grasping and measuring unit 1 is as follows: 1) Initial positioning: The gripping and measuring unit 1 is initially positioned (at a set height above the detection platform 1-4) so ​​that after the gripping and measuring unit 1 stops in place, there is a certain distance (e.g., 10mm) between the first vacuum suction cup 1-2 and the detection plane of the detection platform 1-4. When there is no single board, the thickness detection rod 1-3 directly contacts the detection plane of the detection platform 1-4. At this time, the displacement of the thickness detection rod 1-3 is set to 0.

[0079] 2) Actual measurement: The grasping and measuring unit 1 grasps a single board from the single board stacking platform 7 and positions it initially. The first vacuum suction cup 1-2 releases the single board, which falls onto the detection plane of the detection platform 1-4. The thickness detection rod 1-3 extends and retracts, contacting the upper surface of the single board with a certain pressure (e.g., a contact pressure of 5N). The displacement of the thickness detection rod 1-3 is read by the detection rod displacement measuring unit 1-5 and used as the single board thickness value at that measurement point. The thickness value is then transmitted to the billet assembly database unit 4.

[0080] 3) Once the single plate is in place, the thickness detection rod 1-3 moves upward, and the first vacuum suction cup 1-2 moves downward or is driven downward by the first carrier 1-1 to pick up the single plate whose thickness value has been measured and move it to the storage plate area. Place the single plate in a suitable (empty) position. Record the position information of the single plate in the storage plate area and transmit it to the billet assembly database unit 4.

[0081] The positions of the aforementioned storage areas can be dynamically adjusted through the billet assembly database unit 4, which pre-stores the coding information and corresponding position parameters of each storage area. When a storage area is occupied, the billet assembly database unit 4 immediately updates the status of the storage area to occupied, making the storage area unusable again, and associates the storage area with the corresponding single plate. When a single plate in an occupied storage area is removed, the billet assembly database unit 4 immediately updates the status of the storage area to vacant, making the storage area available for reoccupancy.

[0082] 4) The grabbing and inspection device returns to position 7 on the single board stacking platform to grab the next single board, and repeats the action.

[0083] The billet handling and assembly unit 3 includes: A movable second carrier 3-1, with at least one second vacuum suction cup 3-2 connected to its lower part.

[0084] In this embodiment, such as Figure 5 As shown, the billet handling unit 3 is equipped with 9 second vacuum suction cups 3-2, a walking mechanism, an alignment mechanism, etc.

[0085] The second vacuum suction cup 3-2 is used to pick up the single board identified as the blank to be processed by suction; the walking mechanism can adopt a hoisting track, which can drive the second carrier 3-1 to move to the corresponding position under the control of the simulation assembly unit 2; the alignment mechanism can adopt a cylinder-driven positioning baffle assembly, which can perform edge alignment calibration of the picked single board by the extension and retraction of the baffle.

[0086] Referring to the simulation results, the second carrier 3-1 drives the second vacuum suction cup 3-2 to grab the single plate from the storage plate area and move to the front position of the billet assembly conveyor 6 for billet assembly. Then the simulation billet assembly unit 2 returns to the appropriate position in the storage plate area and repeats the action.

[0087] The continuous flat pressing equipment for plywood also includes: With m Storage platform 5 at each workstation, and storage platform 5 m Each workstation serves as a storage area.

[0088] In this embodiment, there are two multi-station storage platforms 5 (one horizontal stripe single board and one vertical stripe single board, each including m / 2 stations). The stations of the two multi-station storage platforms 5 serve as storage areas, and horizontal stripe single boards or vertical stripe single boards are placed at each station.

[0089] According to one aspect of the present invention, an electronic device is provided, comprising: one or more processors, one or more memories, and one or more computer programs; wherein the processor is connected to the memory, and the one or more computer programs are stored in the memory; when the electronic device is running, the processor executes the one or more computer programs stored in the memory to cause the electronic device to perform the continuous flat pressing production method for plywood as described above.

[0090] According to one aspect of the present invention, a computer-readable storage medium is provided for storing computer instructions, which, when executed by a processor, implement the plywood continuous flat pressing production method as described above.

[0091] Computer-readable storage media can include any medium capable of storing or transmitting information. Examples of computer-readable storage media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and so on. Code segments can be downloaded via computer networks such as the Internet and intranets.

[0092] The continuous flat-pressing production method and equipment for plywood of the present invention comprises the following steps: S1: Based on the required number of veneer layers for the slab blank. n Select from the available single plates according to the preset assembly logic. n S2: Perform simulation assembly of single plates to obtain multiple simulated slabs; S3: Calculate at least one thickness index for each simulated slab and determine candidate slabs; S4: Calculate the first and last thickness deviation values ​​between all candidate slabs and the latest slab to be processed, and select the candidate slab with the smallest first and last thickness deviation value as the new slab to be processed; and delete the single plates that make up the slab to be processed from the selectable single plates; S5: Sort the slabs to be processed according to their front and back order; S6: Obtain newly added single plates, and select the newly added single plates, the single plates in the remaining candidate slabs, and the single plates that do not make up the candidate slabs as selectable single plates, and return to step S1; until the set termination condition is reached.

[0093] Furthermore, it should be noted that the present invention can be provided as a method, apparatus, or computer program product. Therefore, embodiments of the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, embodiments of the present invention can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code.

[0094] Embodiments of the present invention are described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0095] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing terminal equipment to cause a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0096] It should also be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0097] Finally, it should be noted that the above description represents a preferred embodiment of the present invention. It should be pointed out that although preferred embodiments have been described, those skilled in the art, once they understand the basic inventive concept of the present invention, can make various improvements and modifications without departing from the principles described herein. These improvements and modifications should also be considered within the scope of protection of the present invention. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

Claims

1. A method for continuous flat pressing production of plywood, characterized in that, The steps are as follows: S1: Based on the number of veneer layers required for the slab. n Select from the available single plates according to the preset assembly logic. n Zhang single-board is used to simulate billet assembly, resulting in multiple simulated billets; in n ≥2, and the number of selectable single boards is greater than n ; S2: Calculate at least one thickness index for each simulated slab and determine the simulated slabs whose thickness indexes meet the corresponding thickness preset conditions as candidate slabs. The thickness parameters include the average thickness and thickness deviation of the simulated slab. The average thickness of the simulated slab is an arithmetic average calculated based on the thickness of the simulated slab at each thickness measurement point and the number of thickness measurement points. The thickness of the simulated slab at each thickness measurement point is obtained by summing the thicknesses of all the individual plates that make up the simulated slab at each thickness measurement point. The thickness deviation value of the simulated slab is the maximum value of the thickness difference between any two thickness measurement points on the simulated slab. S3: Calculate the first and last thickness deviation values ​​between all candidate slabs and the latest slab to be processed, and take the candidate slab with the smallest first and last thickness deviation value as the new slab to be processed. And delete the single boards that make up the blank to be processed from the optional single boards; The initial blanks to be processed are selected from the first group of candidate blanks based on the set selection criteria; S4: According to the front and back order of the blanks to be processed, the new blanks to be processed are positioned and physically assembled for subsequent flat pressing production of plywood. S5: Obtain the newly added single board, and treat the newly added single board, the single boards in the remaining candidate slabs, and the single boards that do not form a candidate slab as optional single boards, and return to step S1; until the set termination condition is reached. The number of newly added boards is greater than or equal to 0.

2. The continuous flat-pressing production method for plywood according to claim 1, characterized in that, In S3, the process of obtaining the thickness deviation values ​​at the beginning and end is as follows: S31: Calculate the average thickness at the first end based on the thickness at the thickness measurement point located at the first end of the simulated slab and the number of such thickness measurement points; The average thickness at the tail end is calculated based on the thickness at the thickness measurement point located at the tail end of the simulated slab and the number of such thickness measurement points. S32: The difference between the average thickness of the tail end of the latest blank to be processed and the average thickness of the head end of the candidate blank is taken as the absolute value to obtain the head-tail thickness deviation value.

3. The continuous flat-press production method for plywood according to claim 1 or 2, characterized in that, S5 also includes: The cumulative number of time-stuck single boards is calculated, and if the number of time-stuck single boards exceeds a set threshold, the corresponding time-stuck single board is deleted from the selectable single boards. The retained slabs are slabs from the remaining candidate slabs and slabs that did not form candidate slabs; The number of retention rounds is the total number of rounds in which a single board continuously becomes a retention single board.

4. A continuous flat pressing production equipment for plywood, characterized in that, include: The grasping and measuring unit (1) is used to grasp the single board, transport and place it in the storage area, and obtain the number of the single board and the location of the storage area; And the thickness of the single board at each thickness measuring point was measured; The number of storage plate areas is: m indivual, m ≥ n Furthermore, each storage area can have at most one single board. The simulation assembly unit (2) is used to determine the number of single-layer plates required for the required slab. n Select from the available boards n Zhang single-board is used to simulate billet assembly, resulting in multiple simulated billets; Based on the thickness index and preset thickness conditions of the simulated slab, the slabs to be processed are selected from the simulated slabs, and the slabs to be processed are sorted according to their sequential order. The thickness parameters include the average thickness and thickness deviation of the simulated slab. The average thickness of the simulated slab is an arithmetic average calculated based on the thickness of the simulated slab at each thickness measurement point and the number of thickness measurement points. The thickness of the simulated slab at each thickness measurement point is obtained by summing the thicknesses of all the individual plates that make up the simulated slab at each thickness measurement point. The thickness deviation value of the simulated slab is the maximum value of the thickness difference between any two thickness measurement points on the simulated slab. The blanks to be processed are sorted as follows: Calculate the first and last thickness deviation values ​​between all candidate slabs and the latest slab to be processed, and select the candidate slab with the smallest first and last thickness deviation value as the new slab to be processed. And delete the single boards that make up the blank to be processed from the optional single boards; The initial blanks to be processed are selected from the first group of candidate blanks based on the set selection criteria; The grabbing and transporting unit (3) is used to take out single boards from the storage area according to the arrangement order of the single boards in the blank to be processed, the number of the corresponding single board and the location of the storage area; and stack them on the single board input mechanism according to the arrangement order of the single boards in the blank to be processed to form the blank to be processed.

5. The continuous flat pressing production equipment for plywood according to claim 4, characterized in that, The simulation assembly unit (2) is also used to accumulate the number of stranded wheels of the stranded single plate, and when the number of stranded wheels exceeds the set wheel threshold, delete the corresponding stranded single plate from the selectable single plate and generate a stranded single plate removal command. The retained slabs are slabs from the remaining candidate slabs and slabs that did not form candidate slabs; The number of retention rounds is the total number of rounds in which a single board continuously becomes a retention single board; The grabbing and transporting unit (3) is also used to respond to the instruction to remove the retained single board and remove the retained single board from the storage area according to the location of the storage area of ​​the retained single board.

6. The continuous flat pressing production equipment for plywood according to claim 4, characterized in that, Also includes: The billet database unit (4) is used to add the number of the single plate, the location of the storage area, and the thickness of the single plate at each thickness measurement point when the single plate is placed in the storage area. It is also used to delete the number of the single board, the location of the storage area, and the thickness of the single board at each thickness measurement point when the single board is removed from the storage area.

7. The continuous flat pressing production equipment for plywood according to any one of claims 4 to 6, characterized in that, The grasping and measuring unit (1) includes: A movable first carrier (1-1) is provided, with at least one first vacuum suction cup (1-2) and multiple retractable thickness detection rods (1-3) connected to its lower part; the multiple retractable thickness detection rods (1-3) correspond to the positions of each thickness measurement point on the single board; Inspection platform (1-4); The upper surface of the inspection platform (1-4) serves as a reference surface and a single plate is placed on it. The thickness of the single plate at each measuring point is measured by a displacement thickness measurement method using multiple thickness measuring rods (1-3). The detection rod displacement measurement unit (1-5) is used to obtain the amount of expansion and contraction displacement of each thickness detection rod (1-3).

8. The continuous flat pressing production equipment for plywood according to any one of claims 4 to 6, characterized in that, The billet handling and assembly unit (3) includes: A movable second carrier (3-1) is provided, with at least one second vacuum suction cup (3-2) connected to the lower part of the second carrier (3-1).

9. The continuous flat pressing production equipment for plywood according to claim 7, characterized in that, Also includes: With m The storage platform (5) of each workstation, and the storage platform (5) m Each workstation serves as a storage area.

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