A rotary cutting waste veneer raw material recycling production line and recycling method

Abstract

The present invention discloses a recovery production line and a recovery method for rotary cutting waste veneer raw materials, which includes a stone removing and feeding machine, a metal removing machine, a chipper, a first screw conveyor, a rolling screening machine, a swinging screening machine and a pre-steaming bin that are successively connected by a conveying mechanism. The recovery method is as follows: The veneer raw materials are sent to the production and processing site for stacking; the veneer raw materials are loaded onto the stone removing and feeding machine, and the falling height and slope between the upper stone removing conveyor belt and the lower stone removing conveyor belt are used for throwing and scattering materials to remove the lumps and heavy objects in the veneer raw materials, and the metal impurities mixed in the materials are adsorbed by the metal removing machine; then it is sent into the chipper for crushing, and then sent into the first screw conveyor and the rolling screening machine for screening, and the swinging screening machine for full tumbling screening, and then transferred to the pre-steaming bin for pre-steaming, and then pressed into stoppers by a cork screw machine and sent into a hot grinder for hot grinding to make fibers. The present invention can quickly recover and utilize the rotary cutting waste veneer raw materials, and reduce the cost.

Description

Technical Field

[0001] The invention belongs to the technical field of waste board processing and recycling production, and particularly relates to a rotary cutting waste veneer raw material recycling production line and a recycling method. Background Art

[0002] Fiberboard is a kind of artificial board made from small-diameter logs, logging and processing residues, and non-wood plant fiber raw materials through slicing, cooking, fiber separation, drying, and sanding. China is a large consumer of wood, and the wood resources are relatively scarce. Considering resource conservation, most fiberboard production enterprises use waste wood, forestry secondary small firewood, or fast-growing wood as the main raw material sources for fiberboard production, which can not only reduce resource waste but also lower production costs. However, when the recycled waste wood is sliced into veneers through sorting, rotary cutting, or planing, it is often accompanied by oversized or overweight sundries such as stones, bricks, and iron blocks with large masses. The general method to remove these sundries is to wash, dry, and screen the veneers to remove the stones, bricks, and iron blocks. However, the sewage used for cleaning is difficult to recycle and treat, resulting in serious environmental pollution, high costs, and complex processes. Moreover, the moisture content of the veneers is too high, which affects the drying efficiency of the veneer materials and may also cause the veneer materials to deteriorate, reducing the quality of fiberboard production. Summary of the Invention

[0003] The purpose of the invention is to provide a rotary cutting waste veneer raw material recycling production line and a recycling method. The invention can quickly recycle and utilize fiber veneer raw materials, and directly and quickly remove stones, bricks, and iron blocks in the rotary cutting fiber veneer raw materials without going through processes such as water washing. To achieve the above purpose, the invention adopts the following technical solutions:

[0004] According to one aspect of the invention, a rotary cutting waste veneer raw material recycling production line is provided. The recycling production line includes a stone removing feeder, a metal removing machine, a chipper, a first screw conveyor, a rolling screening machine, a swinging screening machine, and a pre-cooking bin connected in sequence through a conveying mechanism. The conveying mechanism includes a first conveyor belt, a second conveyor belt, a third conveyor belt, a fourth conveyor belt, and a fifth conveyor belt. The discharge port of the stone removing feeder is connected to the inlet of the chipper through the first conveyor belt, and the metal removing machine is arranged on the first conveyor belt. The discharge port of the chipper is connected to one side of the inlet of the first screw conveyor through the second conveyor belt. The discharge port of the first screw conveyor is connected to the inlet of the rolling screening machine through the third conveyor belt. The discharge port of the rolling screening machine is connected to the inlet of the swinging screening machine through the fourth conveyor belt. The discharge port of the swinging screening machine is connected to the inlet of the pre-cooking bin through the fifth conveyor belt.

[0005] Further preferably in the above solution, the height of one side of the feeding port of the first conveyor belt, the height of one side of the feeding port of the second conveyor belt, the height of one side of the feeding port of the third conveyor belt, the height of one side of the feeding port of the fourth conveyor belt, and the height of one side of the feeding port of the fifth conveyor belt are lower than the height of the corresponding discharging port side.

[0006] Further preferably in the above solution, a sixth conveyor belt is provided at the discharging port of the swing screening machine, which is inclined upward along the discharging direction, and the discharging end of the sixth conveyor belt is located above the feeding end of the fifth conveyor belt.

[0007] Further preferably in the above solution, the stone removing and feeding machine includes a support frame, an upper stone removing conveyor belt and a lower stone removing conveyor belt which are arranged in parallel up and down in the support frame and inclined with the feeding end lower than the discharging end. Baffle plates fixed to the top of the support frame are arranged along the two side edges of the upper stone removing conveyor belt and along the conveying direction. The discharging end of the lower stone removing conveyor belt is flush with or extends outwards from one side of the discharging end of the baffle plate. One or more parallel upper digging shafts are arranged above the discharging end of the upper stone removing conveyor belt and along the discharging direction of the baffle plate. Digging grabs are arranged on the upper digging shafts. A guide roller parallel to the upper digging shafts is fixed between the upper part of the discharging end of the lower stone removing conveyor belt and above the discharging end of the lower stone removing conveyor belt and on one side of the discharging end of the fixed baffle plate. A first guide plate inclined downward along the discharging direction is arranged on the support frame on one side of the discharging end of the lower stone removing conveyor belt.

[0008] Further preferably in the above solution, the feeding end of the lower stone removing conveyor belt is fixed in the middle of the support frame, the discharging end of the lower stone removing conveyor belt extends out from one side of the discharging end of the baffle plate and is fixed on one side of the discharging end of the support frame. The feeding end of the upper stone removing conveyor belt extends out of the support frame. The discharging end of the upper stone removing conveyor belt extends to above the middle of the lower stone removing conveyor belt. A lower digging shaft is arranged between the lower part of the extending direction of the discharging end of the upper stone removing conveyor belt and above the lower stone removing conveyor belt.

[0009] Further preferably in the above solution, a metal detector is arranged above the first conveyor belt and close to the feeding port side of the metal removing machine. The metal removing machine includes a machine shell, an electromagnet and a controller arranged in the machine shell. Slide rails are arranged on the front and rear sides of the top of the machine shell. A sliding seat is arranged on the slide rails. A cross beam is arranged between the front and rear slide rails. The two ends of the cross beam are connected to the sliding seat. The electromagnet is connected below the cross beam. The controller is electrically connected to the metal detector and the electromagnet respectively.

[0010] Further preferably in the above solution, a telescopic cylinder is arranged on the cross beam. The output shaft of the telescopic cylinder vertically extends downward below the cross beam and is connected to the top of the electromagnet. The controller is electrically connected to the telescopic cylinder.

[0011] Further preferably, in the above solution, a second screw conveyor is horizontally arranged below the outlet of the pre-cooking bin. The pre-cooking bin includes an eight-character square shell, a discharge screw, and a driving motor arranged outside the eight-character square shell. A plurality of parallel discharge screws are arranged on the inner wall of the lower end outlet of the eight-character square shell, and each discharge screw is respectively connected to a driving motor in a transmission manner. A steam delivery pipe is arranged around the outer wall of the lower end outlet and the upper middle part of the eight-character square shell, and a plurality of jet valves extending upward into the eight-character square shell are arranged on the steam delivery pipe. The lower end outlet of the eight-character square shell is communicated with the inlet of the feeding screw cylinder of the second screw conveyor.

[0012] Further preferably, in the above solution, a plurality of layers of staggered second guide plates extending toward the center and inclined downward are respectively arranged on the inner walls on both sides of the eight-character square shell.

[0013] Further preferably, in the above solution, a cork screw machine is also arranged on the outlet side of the lower end of the second screw conveyor, and a refiner is also arranged on the outlet side of the cork screw machine. The outlet of the cork screw machine is communicated with the inlet of the refining chamber of the refiner through a cooking cylinder.

[0014] According to another aspect of the present invention, a recycling method using a recycling production line for rotary cutting waste veneer raw materials of the present invention: The recycling method includes the following steps:

[0015] Step 1: Send the veneer raw materials to the production and processing site for stacking for 7-10 days to ferment and soften the veneer raw materials and evaporate the moisture, reducing the moisture content of the veneer raw materials;

[0016] Step 2: Load the veneer raw materials onto the stone removal and feeding machine for quantitative feeding, use the drop and slope between the upper stone removal conveyor belt and the lower stone removal conveyor belt for throwing and scattering materials, remove the lumps and heavy objects in the veneer raw materials, and evenly scatter them on the first conveyor belt and pass through the metal impurity removal machine. The electromagnet is close to the veneer raw materials on the surface of the first conveyor belt to adsorb the metal blocks mixed in the materials and remove the metal substances mixed in the single-piece materials;

[0017] Step 3: The veneer raw materials after removing the metal substances are loosened and dispersed at the discharge end of the first conveyor belt, and after removing the miscellaneous substances in the veneer raw materials, they are sent into a chipper for chipping and breaking into veneer pieces; The broken veneer pieces are stacked in the warehouse for more than 7 days to make the veneer pieces ferment to generate heat and volatilize the moisture, so as to reduce the adhesion of sand and gravel on the veneer pieces;

[0018] Step 3: Load the veneer sheet materials stored in the warehouse into the feeding bin above the first screw conveyor. The materials slide down from the feeding bin and fall into a group of first screw conveyors. The first screw conveyors evenly send out the veneer sheet materials and drop them onto the third conveyor belt. The third conveyor belt transports the veneer sheet materials to a rolling screening machine for screening. The qualified veneer sheet materials fall from the discharge opening of the drum screen of the rolling screening machine onto the fourth conveyor belt and are transported by the fourth conveyor belt to a swing screening machine. The veneer sheet materials enter the swing screening machine for reciprocating swinging and full tumbling screening, and stones, residual fine sand, and some fine powder are removed.

[0019] Step 4: The veneer sheet materials qualified by the swing screening machine fall onto the sixth conveyor belt, are transported by the sixth conveyor belt to the discharge end and then fall onto the fifth conveyor belt and are evenly spread out. Then, they are transported by the fifth conveyor belt to a pre-steaming bin for pre-steaming and softening the veneer sheet materials.

[0020] Step 5: After the veneer sheet materials in the pre-steaming bin are pre-steamed and softened, they are evenly sent out by the discharge screw in parallel strips to the lower outlet and fall into the second screw conveyor. The second screw conveyor quantitatively discharges the pre-heated and softened veneer sheet materials into a cork screw machine. The cork screw machine presses the veneer sheet materials into corks and transports them to a steaming cylinder for full steaming and softening, and then transports them to a refiner for hot grinding to make fibers.

[0021] In summary, due to the adoption of the above technical solutions in the present invention, the present invention has the following technical effects:

[0022] The recycling production line of the present invention can quickly recycle and utilize the rotary-cut waste veneer raw materials. The veneer raw materials can directly and quickly remove stones, bricks, and iron blocks in the rotary-cut fiber waste veneer raw materials without going through processes such as water washing. It can reduce the moisture content of the veneer within a short production cycle, improve the drying efficiency of the veneer materials and the quality of fiberboard production, reduce waste of resources, and lower production costs. Description of the Drawings

[0023] Figure 1 is the overall structural schematic diagram of a rotary-cut waste veneer raw material recycling production line of the present invention;

[0024] Figure 2 is the structural schematic diagram of the stone-removing feeding machine of the present invention;

[0025] Figure 3 is the structural schematic diagram of the metal impurity-removing machine of the invention;

[0026] Figure 4 is the installation structural schematic diagram of the electromagnet of the metal impurity-removing machine of the invention;

[0027] Figure 5 is the control principle schematic diagram of the metal impurity-removing machine of the invention;

[0028] Figure 6 is a schematic diagram of the overall structure of the pre-cooking bin of the invention;

[0029] Figure 7 is a schematic diagram of the internal structure of the pre-cooking bin of the invention;

[0030] In the drawings, in addition to the stone feeder 1, metal impurity remover 2, chipper 3, first screw conveyor 4, rolling screen 5, oscillating screen 6, pre-cooking bin 7, second screw conveyor 8, cork screw machine 9, refiner 10, cooking cylinder 10a, first conveyor belt 11, second conveyor belt 12, third conveyor belt 13, fourth conveyor belt 14, fifth conveyor belt 15, sixth conveyor belt 16, feeding bin 40, support frame 101, upper stone removal conveyor belt 102, lower stone removal conveyor belt 103, baffle 104, upper material digging shaft 105, material digging claw 105a, first guide plate 107, lower material digging shaft 108, metal detector 110, machine shell 200, electromagnet 201, slide rail 202, sliding seat 203, cross beam 204, telescopic cylinder 205, eight-character square shell 701, discharge screw 702, drive motor 703, steam delivery pipe 704, jet valve 705, second guide plate 706. Detailed Description of the Invention

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following takes preferred embodiments as examples and further elaborates on the present invention with reference to the accompanying drawings. However, it should be noted that many details listed in the specification are only for enabling the reader to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0032] Such as Figure 1As shown, a recovery production line for rotary-cut waste veneer raw materials provided by the present invention. The recovery production line includes a stone removal and feeding machine 1, a metal impurity removal machine 2, a chipper 3, a first screw conveyor 4, a rolling screening machine 5, a swing screening machine 6, and a pre-cooking bin 7 that are sequentially connected through a conveying mechanism. The conveying mechanism includes a first conveyor belt 11, a second conveyor belt 12, a third conveyor belt 13, a fourth conveyor belt 14, and a fifth conveyor belt 15. The discharge port of the stone removal and feeding machine 1 is connected to the inlet of the chipper 3 through the first conveyor belt 11, and the metal impurity removal machine 2 is arranged on the first conveyor belt 11. The discharge port of the chipper 3 is connected to one side of the inlet of the first screw conveyor 4 through the second conveyor belt 12. The discharge port of the first screw conveyor 4 is connected to the inlet of the rolling screening machine 5 through the third conveyor belt 13. The discharge port of the rolling screening machine 5 is connected to the inlet of the swing screening machine 6 through the fourth conveyor belt 14. The discharge port of the swing screening machine 6 is connected to the inlet of the pre-cooking bin 7 through the fifth conveyor belt 15. The height of the inlet side of the first conveyor belt 11, the height of the inlet side of the second conveyor belt 12, the height of the inlet side of the third conveyor belt 13, the height of the inlet side of the fourth conveyor belt 14, and the height of the inlet side of the fifth conveyor belt 15 are lower than the height of the corresponding discharge port side. A sixth conveyor belt 16 that is inclined upward along the discharge direction is arranged at the discharge port of the swing screening machine 6. The discharge end of the sixth conveyor belt 16 is located above the inlet end of the fifth conveyor belt 15 below, so that after the swing screening machine 6 performs multi-layer screening to separate qualified materials, they fall onto the sixth conveyor belt 16. A certain height difference is formed between the discharge end of the sixth conveyor belt 16 and the inlet end of the fifth conveyor belt 15 below. The materials fall onto the fifth conveyor belt 15 and are scattered and spread out on the fifth conveyor belt 15 and then conveyed to the pre-cooking bin 7 for softening.The purchased veneer raw materials are sent to the processing site for high storage, so that the raw materials can be fermented and softened and the water evaporates inside the yard, which is beneficial to reducing the load of the chipper and stabilizing the moisture content of the raw materials. The storage time is preferably 7 to 10 days. Then, the loader is used to grab the veneer raw materials onto the stone removal feeder 1 (a total of two units) for quantitative feeding, scattering and falling materials, and using the material drop and the slope of each conveyor belt to remove lumps and heavy objects, and evenly scatter them on the second conveyor belt 12 on the side of the chipper 3 inlet. The material on the conveyor belt 12 passes through the metal impurity remover 2 to remove the metal substances mixed in it. The raw materials after the metal substances are removed pass through the licker-in roller to remove the broken impurities. The relatively clean raw materials are sent to the drum chipper 3 for chipping and breaking into single pieces. The broken single pieces are piled up in the warehouse for more than 7 days to make the wood chips ferment and generate heat, and the water evaporates in large quantities, reducing the adhesion of sand and gravel on the single board wood chips; the loader shovels the material into the upper bin 40 above the first screw conveyor 4, and the upper bin 40 guides the slide The material falls into the screw conveyor cylinder of the first screw conveyor 4 and is evenly conveyed out, and falls onto the third conveyor belt 13 and is conveyed to the rolling screen 5 for screening. The qualified single plate pieces fall into the fourth conveyor belt 14 from the drum screen outlet of the rolling screen 5. The qualified materials screened out by rolling are conveyed to the swing screen 6 via the fourth conveyor belt 14. The single plate pieces enter the swing screen 6 for full tossing and tumbling screening and stone removal. The residual fine sand and part of the crushed powder are screened out from the screen holes after reciprocating swinging and are screened by the belt. The qualified veneer sheets are evenly spread out due to the characteristics of the wide surface of the shaking screen, so that the qualified materials sent out by the swing screening are transported by the sixth conveyor belt 16 and fall onto the fifth conveyor belt 15 to be evenly spread out, and then transferred to the pre-cooking bin 7 for softening; the fine sand and part of the crushed powder screened by the rolling screening machine 5 and the swing screening machine 6 are screened out from the sieve holes after screening, and sent to the boiler combustion chamber by the belt conveyor as thermal fuel, thereby completing the screening and stone removal operations of the veneer raw materials.

[0033] In the present invention, if Figure 2, the stone-removing feeding machine 1 includes a support frame 101, an upper stone-removing conveyor belt 102 and a lower stone-removing conveyor belt 103 which are arranged parallel up and down in the support frame 100 and inclined with the feeding end lower than the discharging end. Along the two side edges of the upper stone-removing conveyor belt 102 and in the conveying direction, there are baffle plates 104 fixed to the top end of the support frame 101. The discharging end of the lower stone-removing conveyor belt 103 is flush with or extends outwards from one side of the discharging end of the baffle plate 104. Above the discharging end of the upper stone-removing conveyor belt 102 and in the discharging direction of the baffle plate 104, there are one or more parallel upper digging shafts 105. Digging grabs 105a are arranged on the upper digging shafts 105. Between the lower part of the upper digging shafts 105 and above the discharging end of the lower stone-removing conveyor belt 103 and fixed to one side of the discharging end of the baffle plate 104, there is a guide roller 106 parallel to the upper digging shafts 105. On the support frame 101 on one side of the discharging end of the lower stone-removing conveyor belt 103, there is a first guide plate 107 which is inclined downwards along the discharging direction. The feeding end of the lower stone-removing conveyor belt 103 is fixed in the middle of the support frame 101. The discharging end of the lower stone-removing conveyor belt 103 extends out from one side of the discharging end of the baffle plate 104 and is fixed to one side of the discharging end of the support frame 101. The feeding end of the upper stone-removing conveyor belt 102 extends out of the support frame 100. The discharging end of the upper stone-removing conveyor belt 102 extends above the middle of the lower stone-removing conveyor belt 103. Below the extending direction of the discharging end of the upper stone-removing conveyor belt 102 and above the lower stone-removing conveyor belt 103, there is a lower digging shaft 108. In the present invention, when a loader grabs the single-board raw material onto the stone-removing feeding machine 1 and conveys it upwards and obliquely through the upper stone-removing conveyor belt 102 to one side of the discharging end, during the rotation of the upper digging shaft 105 above, the digging grabs 105a quantitatively transfer and scatter the falling materials above the discharging end of the lower stone-removing conveyor belt 103. On one side of the processing end of the lower stone-removing conveyor belt 103, they are transferred onto the lower stone-removing conveyor belt 103 through the digging grabs (not shown) on the lower digging shaft 108. When the raw material reaches one side of the discharging end of the lower stone-removing conveyor belt 103, it is guided by the guide roller 106 and sent out of the discharging end of the baffle plate 104, and slides down along the first guide plate 107 to the first conveyor belt 11. Due to the height difference and belt slope between the upper stone-removing conveyor belt 102 and the lower stone-removing conveyor belt 103, the lumps and heavy objects mixed in the raw material fall onto the lower stone-removing conveyor belt 103 and roll along its surface to the lower end of the lower stone-removing conveyor belt 103, thus realizing the removal of larger lumps and heavy objects, and at the same time evenly scattering the raw material on the first conveyor belt 11.

[0034] In the present invention, as Figure 3 , Figure 4 and Figure 5, a metal detector 110 is provided above the first conveyor belt 11 and near the feeding port side of the metal removing machine 2. The metal removing machine 2 includes a machine shell 200, an electromagnet 201, and a controller disposed inside the machine shell 200. Slide rails 202 are provided on the front and rear sides of the top end of the machine shell 200. A sliding seat 203 is provided on the slide rails 202. A cross beam 204 is provided between the slide rails 202 on the front and rear sides. Both ends of the cross beam 204 are connected to the sliding seat 203. The electromagnet 201 is connected below the cross beam 204. The controller is electrically connected to the metal detector 110 and the electromagnet 201 respectively. A telescopic cylinder 205 is provided on the cross beam 204. The output shaft of the telescopic cylinder 205 vertically extends downward from the cross beam 204 and is connected to the top of the electromagnet 201. The controller is electrically connected to the telescopic cylinder. The controller is a PLC controller. During the conveying process of the single-board raw material on the first conveyor belt 11 after removing lumps and heavy objects, the metal detector 110 is used to detect whether there are metal blocks in the single-board raw material. If there are metal blocks and their detection signals are sent into the PLC controller, the PLC controller outputs a control signal and starts the electromagnet 201 and the telescopic cylinder 205 inside the machine shell 200 to work. The cross beam 204 slides back and forth along the feeding direction along the slide rails 202 under the drive of the drive motor. The telescopic cylinder 205 pushes the electromagnet 201 close to the single-piece material on the surface of the first conveyor belt 11 to adsorb the metal blocks mixed in the material, so as to remove the metal substances mixed in the single-piece material. The raw material after removing the metal substances passes through a spiked roller 20 provided above the discharge end of the first conveyor belt 11 for loosening and dispersing, removing the fragmented substances in the single-piece material, and sending the material after removing the metal into a chipper 3 for chipping and breaking into single pieces, thus completing the impurity and stone removal operations of the rotary cutting fiberboard principle.

[0035] In the present invention, as Figure 6 and Figure 7A second screw conveyor 8 is horizontally arranged below the outlet of the pre-cooking bin 7. The pre-cooking bin 7 includes an eight-shaped square shell 701, a discharge screw 702 and a drive motor 703 arranged outside the eight-shaped square shell 701. A plurality of parallel discharge screws 702 are arranged on the inner wall of the lower outlet of the eight-shaped square shell 701. Each discharge screw 702 is respectively connected to a drive motor 703 by transmission. A steam delivery pipe 704 is arranged around the lower outlet and the outer wall of the middle and upper part of the eight-shaped square shell 701. A plurality of jet valves 705 extending upward into the eight-shaped square shell 701 are arranged on the steam delivery pipe 704. A temperature sensor (not shown) is also arranged in the eight-shaped square shell 701. An exhaust solenoid valve (not shown) is arranged on the steam delivery pipe 704. ), the exhaust solenoid valve can be opened according to the temperature in the eight-shaped square shell 701 to control the air to be sprayed into the eight-shaped square shell 701, the lower end outlet of the eight-shaped square shell 701 is connected with the inlet of the feeding screw cylinder of the second screw conveyor 8, and the material evenly spread on the fifth conveyor belt 15 is conveyed to the pre-cooking bin 7 to pre-cook the wood chips, so that the veneer is evenly heated, and the evenly heated material falls from the eight-shaped square shell 701 to the discharge screw 702 at the bottom, and the discharge screw 702 discharges the veneer material at a constant pressure into the second screw conveyor 8, and the second screw conveyor 8 discharges the heated veneer in a quantitative manner into the cork screw machine 9 to press the single piece into a cork, and then sends it into the high-temperature cooking cylinder of the hot mill 10 for high-temperature cooking and grinding, and the veneer piece completes the normal use process.

[0036] In the present invention, multiple layers of staggered second guide plates 706 extending toward the center and tilted downward are respectively arranged on the inner walls of both sides of the square shell 701, and a vibrating rod can also be arranged on each second guide plate 706, so that the material can quickly fall to the discharge screw 702 for discharge; the material evenly spread on the fifth conveyor belt 15 is transported and falls into the pre-cooking bin 7, and the material is preheated and preliminarily softened in the square shell 701 of the pre-cooking bin 7. The preheating temperature is generally 70-100°C at the pre-cooking temperature. In the process of the material sliding down to the discharge screw 702 through the multiple layers of second guide plates 706 staggered up and down, the sliding path of the wood chip material is effectively increased, ensuring that the wood chip material fully absorbs heat in the square shell 701 to achieve the effect of preheating and softening. After the preheating is completed, the wood chip material is sent to the hot mill 10 for high-temperature cooking. The temperature of high-temperature cooking and further softening is between 150-180°C.

[0037] According to a recycling method of a rotary cut waste veneer raw material recycling production line of the present invention, the recycling method comprises the following steps:

[0038] Step 1: Send the waste veneer raw materials to the production and processing site and stack them for 7-10 days to ferment and soften the waste veneer raw materials and evaporate the water to reduce the moisture content of the veneer raw materials;

[0039] Step 2: Load the waste single-board raw materials onto the stone-removing feeder 1 for quantitative feeding. Utilize the drop and slope between the upper stone-removing conveyor belt 102 and the lower stone-removing conveyor belt 103 for throwing and scattering the materials, removing the lumps and heavy objects in the single-board raw materials, and evenly scattering them onto the first conveyor belt 11 and passing through the metal impurity remover 2. The falling materials on the first conveyor belt 11 do not exceed 5 cm. Then, use the electromagnet 201 to approach the single-board raw materials on the surface of the first conveyor belt 11 to adsorb the metal blocks mixed in the materials and remove the metal substances mixed in the single-piece materials;

[0040] Step 3: The single-board raw materials after removing the metal substances are loosened and dispersed at the discharge end of the first conveyor belt 11, and after removing the fragmented and miscellaneous substances in the single-board raw materials, they are sent into the chipper 3 for chipping and breaking into single-board pieces; The broken single-board pieces are stacked in the warehouse for more than 7 days to allow the single-board pieces to ferment and generate heat, volatilize moisture, so as to reduce the adhesion of sand and gravel on the single-board pieces;

[0041] Step 3: Load the single-board piece materials stored in the warehouse into the feeding bin 40 above the first screw conveyor 4. Guide and slide them from the feeding bin 40 into a group of first screw conveyors 4. The first screw conveyor 4 evenly sends out the single-board piece materials and drops them onto the third conveyor belt 13. The third conveyor belt 13 conveys the single-board piece materials to the rolling screening machine 5 for screening. The qualified single-board piece materials fall from the discharge opening of the drum screen of the rolling screening machine 5 onto the fourth conveyor belt 14 and are conveyed by the fourth conveyor belt 14 to the oscillating screening machine 6. The single-board piece materials enter the oscillating screening machine 6 for reciprocating swinging and full tumbling screening, and remove the crushed stones, residual fine sand and part of the fine powder;

[0042] Step 4: The single-board piece materials qualified by the oscillating screening machine 6 fall onto the sixth conveyor belt 16, are conveyed by the sixth conveyor belt 16 to the discharge end and fall onto the fifth conveyor belt 15 to be evenly spread out, and then are transferred by the fifth conveyor belt 15 to the pre-cooking bin 7 for pre-cooking and softening the single-board piece materials. The temperature during pre-cooking in the pre-cooking bin 7 is 70 - 100 °C;

[0043] Step 5: After the veneer sheet material in the pre-steaming bin 7 is pre-steamed and softened, it is evenly sent out by 5 parallel discharge screws 702 to the lower outlet and falls into the second screw conveyor 8. The second screw conveyor 8 quantitatively discharges the pre-heated and softened veneer sheet material into the cork screw machine 9. The cork screw machine 9 presses the veneer sheet material into corks and conveys them to the refiner 10 after being fully steamed and softened in the steaming cylinder 10a for internal refining to ensure a stable and continuous supply of wood chip raw materials to the refiner 10. Among them, the temperature in the steaming cylinder 10a is 150 - 180 °C, the steam pressure in the steaming cylinder 10a is 0.60 - 1.20 Mpa, the steaming time is 2 - 3 minutes. After drying the fibers, the moisture content is kept within 8%. The pressure in the grinding chamber of the refiner 10 is lower than the pressure in the steaming cylinder, and the grinding chamber pressure of the refiner 10 is 0.05 - 0.08 Mpa.

[0044] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A recycling production line for rotary cut waste veneer raw materials, the recycling production line comprising a stone removal feeder, a metal impurity remover, a chipper, a first screw conveyor, a rolling screen, a swing screen and a pre-cooking bin connected in sequence through a conveying mechanism, Features: The conveying mechanism comprises a first conveyor belt, a second conveyor belt, a third conveyor belt, a fourth conveyor belt and a fifth conveyor belt. The discharge port of the stone removal feeder is connected with the feed port of the chipper through the first conveyor belt. The metal impurity remover is arranged on the first conveyor belt. The discharge port of the chipper is connected with one side of the feed port of the first screw conveyor through the second conveyor belt. The discharge port of the first screw conveyor is connected with the feed port of the rolling screen through the third conveyor belt. The discharge port of the rolling screen is connected with the feed port of the swing screen through the fourth conveyor belt. The discharge port of the swing screen is connected with the feed port of the pre-cooking bin through the fifth conveyor belt. The height of the first conveyor belt on one side of the feeding port, the height of the second conveyor belt on one side of the feeding port, the height of the third conveyor belt on one side of the feeding port, the height of the fourth conveyor belt on one side of the feeding port and the height of the fifth conveyor belt on one side of the feeding port are lower than the height of the corresponding side of the discharging port; a sixth conveyor belt extending in the discharging direction and inclined upward is provided at the discharging port of the swing screening machine, and the discharging end of the sixth conveyor belt is located above the feeding end of the fifth conveyor belt; the stone removal loading machine includes a support frame, an upper stone removal conveyor belt and a lower stone removal conveyor belt which are arranged in parallel in the support frame and with the feeding end lower than the discharging end, and along the upper stone removal conveyor belt A material baffle plate fixed to the top of the support frame is arranged on both side edges and along the feeding direction, the discharge end of the lower stone removing conveyor belt is flush with or extends outwardly to one side of the discharge end of the material baffle plate, one or more parallel upper digging shafts are arranged above the discharge end of the upper stone removing conveyor belt and along the discharge direction of the material baffle plate, a digging grab is arranged on the upper digging shaft, a guide roller parallel to the upper digging shaft is fixed between below the upper digging shaft and above the discharge end of the lower stone removing conveyor belt and on one side of the discharge end fixed to the material baffle plate, and a first guide plate inclined downward along the discharge direction is arranged on the support frame on one side of the discharge end of the lower stone removing conveyor belt; A second screw conveyor is horizontally arranged below the outlet of the pre-cooking bin, and the pre-cooking bin includes an eight-shaped square shell, a discharge screw and a drive motor arranged outside the eight-shaped square shell, and a plurality of parallel discharge screws are arranged on the inner wall of the lower outlet of the eight-shaped square shell, and each discharge screw is respectively connected to a drive motor for transmission, and a steam delivery pipe is arranged around the lower outlet and the outer wall of the middle and upper part of the eight-shaped square shell.

2. According to claim 1, a production line for recycling waste veneer raw materials, Features: The feeding end of the lower stone-removing conveyor belt is fixed in the middle of the support frame, the discharging end of the lower stone-removing conveyor belt extends out of one side of the discharging end of the baffle plate and is fixed on one side of the discharging end of the support frame, the feeding end of the upper stone-removing conveyor belt extends out of the outside of the support frame, the discharging end of the upper stone-removing conveyor belt extends to the upper part of the middle of the lower stone-removing conveyor belt, and a downward digging shaft is arranged between the lower part of the extending direction of the discharging end of the upper stone-removing conveyor belt and above the lower stone-removing conveyor belt.

3. A rotary cutting waste veneer raw material recycling production line according to claim 1, characterized in that: A metal detector is arranged above the first conveyor belt and close to one side of the feeding port of the metal impurity removal machine. The metal impurity removal machine includes a machine shell, an electromagnet and a controller arranged in the machine shell. Slide rails are arranged on the front and rear sides of the top of the machine shell. A sliding seat is arranged on the slide rails. A cross beam is arranged between the slide rails on the front and rear sides. The two ends of the cross beam are connected to the sliding seat. The electromagnet is connected below the cross beam. The controller is electrically connected to the metal detector and the electromagnet respectively.

4. A rotary cutting waste veneer raw material recycling production line according to claim 3, characterized in that: A telescopic cylinder is arranged on the cross beam. The output shaft of the telescopic cylinder vertically extends downward from the cross beam and is connected to the top of the electromagnet. The controller is electrically connected to the telescopic cylinder.

5. A rotary cutting waste veneer raw material recycling production line according to claim 1, characterized in that: A plurality of jet valves extending upward into the eight-shaped square shell are arranged on the steam delivery pipe. The lower end outlet of the eight-shaped square shell is communicated with the inlet of the feeding spiral cylinder of the second screw conveyor. A temperature sensor is also arranged in the eight-shaped square shell. An exhaust solenoid valve is arranged on the steam delivery pipe.

6. A rotary cutting waste veneer raw material recycling production line according to claim 1, characterized in that: Multi-layer staggered second guide plates extending towards the center and inclined downward are respectively arranged on the inner walls on both sides of the eight-shaped square shell.

7. A rotary cutting waste veneer raw material recycling production line according to claim 5, characterized in that: A cork screw machine is further arranged on the outlet side at the lower end of the second screw conveyor, a refiner is further arranged on the outlet side of the cork screw machine, and the outlet of the cork screw machine is communicated with the inlet of the refining chamber of the refiner through a cooking cylinder.

8. A recycling method of a rotary cutting waste veneer raw material recycling production line according to any one of claims 1 to 7, characterized in that: The recycling method includes the following steps: Step 1: Send the waste veneer raw materials to the production and processing site and stack them for 7-10 days to ferment and soften the waste veneer raw materials and evaporate the moisture, reducing the moisture content of the veneer raw materials; Step 2: Load the waste veneer raw materials onto the stone-removing feeding machine for quantitative feeding. Use the height difference and slope between the upper stone-removing conveyor belt and the lower stone-removing conveyor belt for throwing and scattering the materials, remove the lumps and heavy objects in the veneer raw materials, and evenly scatter them on the first conveyor belt and pass through the metal impurity removal machine. The electromagnet approaches the veneer raw materials on the surface of the first conveyor belt to adsorb the metal blocks mixed in the materials and remove the metal substances mixed in the single-piece materials; Step 3: The veneer raw material after removing metal substances is loosened and dispersed at the discharge end of the first conveyor belt. After removing the sundry substances in the veneer raw material, it is sent into a chipper for chipping and crushing into veneer chips. The crushed veneer chips are stacked in a warehouse for more than 7 days to generate heat by fermentation of the veneer chips and volatilize moisture, so as to reduce the adhesion of sand and gravel on the veneer chips; Step 3: Load the veneer chip materials stored in the warehouse into the feeding bin above the first screw conveyor. The materials slide down from the feeding bin and fall into a group of first screw conveyors. The first screw conveyors evenly send out the veneer chip materials and fall onto the third conveyor belt. The third conveyor belt transports the veneer chip materials to a rotary screening machine for screening. The qualified veneer chip materials fall from the discharge opening of the drum screen of the rotary screening machine onto the fourth conveyor belt and are transported by the fourth conveyor belt to a reciprocating screening machine. The veneer chip materials enter the reciprocating screening machine for reciprocating swinging and full tumbling screening, and remove gravel, residual fine sand and part of the powder; Step 4: The veneer chip materials qualified by the reciprocating screening machine fall onto the sixth conveyor belt, are transported by the sixth conveyor belt to the discharge end and fall onto the fifth conveyor belt to be evenly spread out, and then are transported by the fifth conveyor belt to a pre-steaming bin for pre-steaming and softening the veneer chip materials; Step 5: After the veneer chip materials in the pre-steaming bin are pre-steamed and softened, they are evenly sent out by the discharge screw parallel to the strips to the lower outlet and fall into the second screw conveyor. The second screw conveyor quantitatively discharges the pre-heated and softened veneer chip materials into a cork screw machine. The cork screw machine presses the veneer chip materials into corks and transports them to a steaming cylinder for full steaming and softening, and then transports them to a refiner for hot grinding to make fibers.

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