Precision sizing process and device for wood chips

Abstract

This application relates to the technical field of the preparation of particleboard, and a precise sizing process for particles, including the processes of metering and pretreatment and sizing. It is characterized in that, in the process of metering and pretreatment, the particles fall from a blanking channel with a width of 2 - 5 mm to the discharge port while adhering to the wall surface of the blanking channel under the action of continuous adsorption force; in the sizing process, the glue liquid, curing agent, additives, and functional agents that make up the adhesive are sprayed simultaneously but separately, mixed during the spraying process, and sprayed in the state of the adhesive onto the particles that fall to the discharge port. The present invention realizes precise sizing of the particles by relatively precisely determining the particle feeding amount, that is, spraying a set amount of adhesive on the particles per unit feeding amount relatively precisely; at the same time, since the sizing of the particles can be realized at the discharge port, it is an on-line sizing method that can achieve continuous production and improve production efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of particleboard preparation, specifically to the precise sizing process of particles, and also relates to a device suitable for implementing the precise sizing process of such particles. Background Art

[0002] The existing particleboard preparation process generally includes the process of sizing particles. Generally, an adhesive is sprayed on the dried particles, and through continuous stirring, the surface of each particle is covered with the adhesive to achieve the purpose of uniform sizing. The existing devices suitable for particle sizing generally consist of a particle metering and feeding mechanism, a sizing and applying mechanism (including a metering structure), a stirring mechanism, a control system, etc. Since the feeding amount of particles and the spraying amount of the adhesive should be strictly corresponding to ensure the gluing effect of the adhesive, the particles are fed into the sizing mechanism through the particle metering and feeding mechanism, and the feeding amount of particles is determined by calculating the mass difference before and after. The control system calculates the spraying amount of the adhesive accordingly and sprays it on the surface of the particles in the sizing mechanism. Therefore, the particle sizing in the prior art is carried out by times, rather than continuous sizing.

[0003] For example, the invention patent application with the publication number CN116653072A and the title "A shaving sizing and glue mixing equipment" provides a solution. In this invention patent application, the volume method is adopted to determine the feeding amount of shavings and calculate the spraying amount of the adhesive. At the same time, the following structure is provided to achieve the quantitative volume of shavings. The shaving feeding unit includes a vertically arranged conveying box. Transmission rollers are rotatably arranged at both the upper and lower ends of the conveying box. A conveyor belt is arranged between the two transmission rollers. A plurality of material scraping boxes are equally spaced and installed on the outer surface of the conveyor belt, and the volume of each material scraping box is set to be equal. A strip-shaped opening is formed on the side surface of the conveying box. A transmission box is fixed on the side surface of the conveying box at the strip-shaped opening. A disc is rotatably connected in the transmission box. A rotary motor for driving the disc to rotate is arranged on the transmission box. An activity rod is rotatably connected at a non-central position of the disc. A push flat plate that can extend into the strip-shaped opening is connected to the end of the activity rod. In order to ensure that the push flat plate can pass through the strip-shaped opening and move horizontally between the material scraping box and the conveying box, guide slide bars are also connected to both ends of the activity rod. Then, a slide hole block matching the guide slide bars is also arranged in the transmission box. Finally, a falling-back opening is formed on the lower surface at the connection between the material scraping box and the side surface of the conveying box. When the shaving material in the shaving feeding unit rises to the position of the strip-shaped opening along with the material scraping box, the conveying of the conveyor belt is paused. Then, the driving motor is started to make the disc rotate one circle. By using the action of the activity rod and the guide slide bars, the push flat plate moves back once at the upper opening of the material scraping box, so as to remove the excess shaving material emerging from the upper opening of the material scraping box, so that the volume of the shaving material in each material scraping box remains consistent before being fed into the glue mixing unit, and the error does not exceed 5%. Then, the corresponding amount of glue liquid can be quantitatively sprayed by combining with the sizing unit for glue mixing treatment.

[0004] As described above, the technical solution of this invention patent application must pause the conveying of shavings and the spraying of the adhesive when determining the feeding amount of shavings, so continuous sizing of shavings cannot be achieved. At the same time, in the method of determining the amount of shavings by volume, the actual measurement is the bulk volume of shavings. The larger the bulk volume of shavings, the more accurate the calculated volume. In the technical solution of the above invention patent application, in the technical solution of making the volume of the shavings conveyed by the conveyor belt equal each time by feeding the shavings into the material scraping boxes with equal space, due to insufficient bulk volume, factors such as the shape of the shavings and the stacking method will cause the size of the gaps between the shavings to be uncertain, and then the measurement error of the actual feeding amount of shavings is relatively large, far more than 5%.

[0005] On the other hand, the adhesive used in the above technical solution must be pre-prepared in the glue mixing mechanism and then sprayed according to the feeding amount of shavings fed back by the control system. Pre-preparing the adhesive will cause a certain amount of waste of the adhesive and its components.

[0006] In summary, in the prior art, there is a lack of a technical solution that can relatively accurately determine the amount of wood chips fed and achieve continuous sizing. Summary of the Invention

[0007] The technical objective of this application is to at least overcome one of the above technical problems, and provides a precise sizing process and device for wood chips.

[0008] In one aspect of this application, a precise sizing process for wood chips is provided, including a metering and pretreatment process and a glue spraying process. In the metering and pretreatment process, the wood chips fall along the wall surface of the feeding channel under the action of continuous adsorption force and fall from the feeding channel with a width of 2 - 5 mm to the discharge port; in the glue spraying process, the glue liquid, curing agent, additives, and functional agents that make up the adhesive are sprayed simultaneously but separately, mixed during the spraying process, and sprayed in the state of the adhesive onto the wood chips falling to the discharge port.

[0009] By the above method, first, during the falling process, the wood chips are affected by continuous adsorption force and fall in the posture of adhering to the wall surface of the feeding channel, which can play a role in shaping and arranging the posture of the wood chips, achieving the purpose of unifying the gaps between the wood chips, and thus overcoming the problem that the gaps between the wood chips have a greater impact on the actual volume measurement of the stacked wood chips due to the small amount of wood chips weighed each time, and realizing the technical effect of accommodating relatively equal amounts of wood chips in an equal space. Second, by controlling the width of the feeding channel, the number of wood chips falling per unit time is further limited, so that combined with the former, the technical effect of determining the amount of wood chips falling per unit time is jointly achieved. Third, the above method realizes precise sizing of the wood chips by relatively accurately determining the amount of wood chips fed, that is, spraying a set amount of adhesive on the wood chips per unit feed amount relatively precisely. Finally, since it can realize online determination of the amount of wood chips fed and spray the adhesive on the wood chips at the discharge port, it is an online sizing method that can achieve continuous production and improve production efficiency.

[0010] In some embodiments, in the metering and pretreatment process, the adsorption force received by the wood chips is 0.5 - 0.8 MPa / m 2 .

[0011] By this embodiment, when the wood chips receive the adsorption force limited above, the wood chips can be unfolded and the curl degree can be reduced, while the shape of the wood chips is not damaged.

[0012] In some embodiments, the adhesive solution, the curing agent, the auxiliary agent, and the functional agent are sprayed onto the wood chips respectively surrounding the wood chips. The spraying position of the adhesive solution is higher than the spraying positions of the curing agent, the auxiliary agent, and the functional agent, and the circumferential diameter formed by the spraying position of the adhesive solution around the wood chips is smaller than the spraying positions of the curing agent, the auxiliary agent, and the functional agent.

[0013] With this embodiment, since the amount of wood chips treated with glue spraying per unit time can be determined more accurately, the glue spraying process of the present invention can spray each component of the adhesive onto the wood chips separately without pre-mixing, thus overcoming the problems existing in the pre-mixed adhesive and achieving the effects of saving processes and avoiding material waste.

[0014] In some embodiments, before being subjected to the adsorption force, the wood chips first roll under the action of air flow.

[0015] In the second aspect of the present application, a precise glue application device for wood chips is provided, including:

[0016] A housing, which is vertically arranged;

[0017] A suction channel, which is vertically arranged inside the housing;

[0018] A blanking channel, which is arranged inside the housing, surrounds the suction channel and is coaxial with it. The top of the blanking channel is provided with a feeding port, and the bottom is provided with a discharging port. The blanking channel has a tendency to narrow from top to bottom, and the width of the lower section of the blanking channel is 2-5 mm;

[0019] A suction mechanism, which can form a suction air flow from the blanking channel into the interior of the suction channel; and

[0020] An annular glue spraying mechanism, which is arranged around the lower section of the blanking channel and can spray the adhesive towards the discharging port.

[0021] In some embodiments, the suction channel is formed by enclosing a first pipe fitting. The first pipe fitting includes a first pipe fitting upper section and a first pipe fitting lower section that are connected. The first pipe fitting upper section is narrow at the top and wide at the bottom, and the first pipe fitting lower section has the same diameter everywhere. The blanking channel is formed by enclosing a second pipe fitting and the first pipe fitting.

[0022] In some embodiments, at least the first pipe fitting upper section is made of a one-way membrane, and the allowed passing direction is from the outside to the inside of the first pipe fitting. The top of the first pipe fitting is closed, and the suction mechanism sucks at the bottom of the first pipe fitting.

[0023] In some embodiments, the upper section of the first pipe fitting is conical, and the central angle of its developed sector is 90°.

[0024] In some embodiments, at least the upper section of the second pipe fitting is made of a single-sided film, and the allowed passing direction is from the outside to the inside of the second pipe fitting; the blowing mechanism is arranged around the upper part of the second pipe fitting and can blow air towards the second pipe fitting.

[0025] In some embodiments, the annular glue spraying mechanism includes a first annular spray head, a second annular spray head, a third annular spray head, and a fourth annular spray head that are installed through the housing and stacked from top to bottom. The first annular spray head, the second annular spray head, the third annular spray head, and the fourth annular spray head are all atomizing spray heads, and are respectively connected to a glue source, a curing agent source, an auxiliary agent source, and a functional medicament source through a hydraulic pump by pipelines.

[0026] With this embodiment, the mass ratio of the glue in the adhesive is the highest. By setting the first annular spray head for spraying the glue at the highest position, that is, the farthest from the actual spraying position, the advantage of this setting is that affected by the adsorption force generated by the suction mechanism, the glue can slowly descend at a speed less than the natural falling speed, which is beneficial to the diffusion during the spraying process and the full mixing of each component.

[0027] In summary, first, a precise glue application process and device for wood shavings of the present invention can relatively precisely determine the amount of wood shavings put in, so as to achieve precise glue application for wood shavings, that is, relatively precisely spray a set amount of adhesive on the wood shavings with a unit input amount; at the same time, since it can determine the amount of wood shavings put in online and evenly spray the adhesive on the wood shavings at the discharge port, therefore, it is an online glue application method that can realize continuous production and improve production efficiency.

[0028] Secondly, in the processes of metering and pretreatment, the posture of the wood shavings is adjusted and the shape of the wood shavings is corrected, so that the wood shavings entering the blanking process have a relatively unified posture and a low curling degree, which is beneficial to obtaining higher bonding performance during the pressing process.

[0029] Thirdly, in some embodiments, the technical solution of the present invention omits the process of mixing and preparing the adhesive, thereby simplifying the production process and improving production efficiency. In some embodiments, the technical solution of the present invention can omit the process of mixing glue, thereby simplifying the production process and improving production efficiency, and can avoid the problem of wood shavings breakage to a certain extent.

[0030] Finally, those skilled in the art can understand that the sizing amount of particleboard is not the more the better. By scientifically determining the sizing amount, the optimal bonding strength can be obtained. Another necessary and sufficient condition for obtaining the optimal bonding strength is precise sizing. Only by accurately controlling the amount of wood chips and the sizing amount can the technical effects of reducing the actual sizing amount, reducing costs, and improving the bonding strength be achieved. In the technical solution of the present invention, a set amount of adhesive is sprayed onto a small amount of wood chips per unit time, so as to ensure the accurate control of the sizing amount and the uniformity of sizing. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of the precise sizing device for wood chips in Embodiment 1 of the present application.

[0033] Figure 2 It is a sectional view of the precise sizing device for wood chips in Embodiment 1 of the present application.

[0034] Figure 3 It is a schematic structural diagram of the precise sizing device for wood chips in Embodiment 2 of the present application.

[0035] Figure 4 It is a sectional view of the precise sizing device for wood chips in Embodiment 2 of the present application.

[0036] Figure 5 It is a sectional view of the precise sizing device for wood chips in Embodiment 3 of the present application.

[0037] In the above-mentioned drawings: 100, sizing device; 110, housing; 120, suction channel; 121, first pipe fitting; 121a, upper section of the first pipe fitting; 121b, lower section of the first pipe fitting; 130, blanking channel; 131, second pipe fitting; 131a, upper section of the second pipe fitting; 131b, lower section of the second pipe fitting; 132, feeding port; 133, discharging port; 140, suction mechanism; 150, annular glue spraying mechanism; 151, first annular nozzle; 152, second annular nozzle; 153, third annular nozzle; 154, fourth annular nozzle; 160, air blowing mechanism. EMBODIMENTS

[0038] To enable those skilled in the art to better understand the technical solutions in this application, the following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0039] Embodiment 1

[0040] Referring to Figure 1 、 Figure 2 A precise sizing device 100 for wood chips shown, which includes a housing 110, a suction channel 120, a blanking channel 130, a suction mechanism 140, and an annular glue spraying mechanism 150.

[0041] The housing 110 is a cylindrical cover with openings at both ends and is vertically arranged. It covers other structures of the sizing device 100 and plays a role in protection, dust prevention, and noise reduction.

[0042] A first pipe fitting 121 is coaxially installed inside the housing 110. The top of the first pipe fitting 121 is closed and the bottom is open, and it is vertically arranged. The first pipe fitting 121 encloses to form a suction channel 120, so that the suction channel 120 is vertically and coaxially arranged inside the housing 110. A second pipe fitting 131 is coaxially sleeved outside the first pipe fitting 121, and the second pipe fitting 131 and the first pipe fitting 121 enclose to form a blanking channel 130. A plurality of through holes are formed on the pipe wall of the first pipe fitting 121 to communicate the suction channel 120 with the blanking channel 130, and the through holes also serve as adsorption ports for providing adsorption force to the blanking channel 130. In order to form enough adsorption ports on the wall surface of the blanking channel 120 (i.e., the first pipe fitting 121) and at the same time ensure that the wall surface of the blanking channel 120 is sufficient to support the wood chips to undergo shaping deformation, the diameter of the through holes is preferably 1-5 mm, for example, 2-3 mm is selected, and the center distance between the through holes is 2-10 mm, for example, 4-6 mm is selected. The pipe wall of the second pipe fitting 131 is a continuous surface. Of course, in some other embodiments, the first pipe fitting 121 can be made of a one-way membrane made of a frame, and the allowed passing direction is from the outside to the inside of the first pipe fitting.

[0043] The width of the blanking channel 130 is 2-5 mm. In other words, there is a gap of 2-5 mm between the outer wall of the first pipe fitting 121 and the inner wall of the second pipe fitting 131. Thus, this gap cooperates with the suction mechanism 140 to be able to more effectively avoid the formation of a stacked state of wood chips in the blanking channel 130, so as to facilitate controlling the number of wood chips falling per unit time.

[0044] The top end of the blanking channel 130 is provided with a feeding port 132, and the bottom end is provided with a discharging port 133. In order to make the wood shavings enter the blanking channel 130 more easily, preferably, the feeding port 132 is formed by enclosing a horn-shaped metal pipe welded or screwed to the top end of the second pipe 131 and the first pipe fitting 121; at the same time, in order to reduce the speed of the wood shavings leaving the blanking channel 130, the discharging port 133 is formed by enclosing a horn-shaped metal pipe welded or screwed to the bottom end of the first pipe 121 and the second pipe fitting 131, so that the wall surface of the discharging port 133 can provide support for the wood shavings, on the one hand, reducing the speed of the wood shavings leaving the blanking channel 130, and on the other hand, making the gluing process easier to implement. The wall surface of the discharging port 133 can be a common horn shape or, as Figure 2 shown, in cross-section, it has an arc-shaped concave shape.

[0045] The suction mechanism 140 can form a suction air flow from the blanking channel 130 into the inside of the suction channel 120. Specifically, the suction mechanism 140 is any kind of exhaust fan in the prior art, and it is fixedly installed below the inside of the first pipe fitting 121 through the housing 110 or through a pit, and sucks at the bottom of the first pipe fitting 121. After the suction mechanism 140 works, it can form a suction air flow, and the flow direction of this air flow is from the blanking channel 130 to the lower part of the suction channel 120. At the same time, a compensation air flow is formed in the blanking channel 130. The compensation air flow includes a first compensation air flow downward from the feeding port 132 and a second compensation air flow upward from the discharging port 133. The first compensation air flow can make the falling of the wood shavings more smooth, and the second compensation air flow can slow down the discharging speed of the wood shavings, so that the wood shavings can be adjusted in place in terms of attitude and shaped in place during the falling process.

[0046] As can be known to those skilled in the art, in order to prevent wood chips and the like from falling into the suction mechanism 140, a dust-proof structure should be provided on the suction mechanism 140.

[0047] The annular gluing mechanism 150 is arranged around the lower section of the blanking channel 130 and can spray an adhesive towards the discharging port 133. In some embodiments, the annular gluing mechanism 150 includes an annular pipe fixedly installed through the housing 110, glue spraying ports equally spaced on the inner side of the annular pipe, atomizing nozzles installed at the glue spraying ports, and an adhesive source (such as a glue tank, etc.) communicated with the annular pipe through components such as a hydraulic pump, a rubber hose, a valve, and a flow sensor. The annular gluing mechanism 150 can apply glue to the wood shavings falling on the wall surface of the discharging port 133.

[0048] As a preferred embodiment, in this embodiment, the annular glue spraying mechanism 150 includes a first annular nozzle 151, a second annular nozzle 152, a third annular nozzle 153, and a fourth annular nozzle 154 which are installed through a housing and stacked from top to bottom. Each annular nozzle 151, 152, 153, 154 includes an annular pipe, a glue spraying port, and an atomizing nozzle, and is respectively connected to a glue liquid source, a curing agent source, an additive source, and a functional agent source through components such as a hydraulic pump, a rubber hose, a valve, and a flow sensor. Thus, each annular nozzle 151, 152, 153, 154 is respectively used to spray glue liquid, curing agent, additive, and functional agent onto the wood chips. Among them, the curing agent and the additive can be any one of the existing technologies, and the functional agent can be selected as a reagent with functions such as flame retardancy, mildew prevention, and moisture prevention according to the functional requirements of the adhesive.

[0049] The mass ratio of the glue liquid in the adhesive is the highest. By setting the first annular nozzle 151 for spraying the glue liquid at the highest position, the glue liquid sprayed by the first annular nozzle 151 is affected by the adsorption force generated by the suction mechanism 140 and can slowly descend at a speed less than the natural falling speed, thus facilitating the diffusion during the spraying process and facilitating the full mixing of each component.

[0050] With the above structure, the process method executed by a precise glue application device 100 for wood chips in this embodiment includes the processes of metering and pretreatment and glue spraying. In the process of metering and pretreatment, the wood chips enter from the feeding port 131 and fall in the blanking channel 130 under the action of their own weight. After starting the suction mechanism 140, an adsorption force is formed on the wall surface of the blanking channel 130. This adsorption force can adjust the posture of the wood chips to be attached to the wall surface and correct the shape of the wood chips to have a lower curl degree. After correction, the curl height of the wood chips is reduced by 50 - 60% compared to the natural state, and the actual curl height of the wood chips is about 2 - 4 mm. Thus, the width of the 2 - 5 mm blanking channel 130 can more effectively avoid the stacking of wood chips and achieve the purpose of determining the number of wood chips falling per unit time.

[0051] In the process of glue spraying, the glue liquid, curing agent, additive, and functional agent that make up the adhesive are simultaneously but separately sprayed, atomized and mixed during the spraying process, and sprayed onto the wood chips falling to the discharge port 133 in the state of the adhesive.

[0052] The wood chips after the glue spraying process do not need to be treated by mixing glue and can directly enter the process of assembling the blank, so the production efficiency of the particleboard can be greatly improved, and the risk of damage to the wood chips that may occur during the glue mixing process can be reduced.

[0053] Embodiment 2

[0054] Refer to Figure 3 , Figure 4As shown, different from Embodiment 1, the blanking channel 130 in this embodiment has a narrowing trend from top to bottom, and the width of the lower section of the blanking channel 130 is 2 - 5 mm. Specifically, the first pipe fitting 121 includes a connected upper section 121a and a lower section 121b of the first pipe fitting. The upper section 121a of the first pipe fitting is in the shape of a conical frustum with a narrow top and a wide bottom, and the lower section 121b of the first pipe fitting has a constant diameter and is cylindrical. Such a setting can more effectively ensure the smooth falling of the unshaped wood shavings.

[0055] In this embodiment, the upper section 121a of the first pipe fitting is made of a one-way film made of a frame. The wall surface of the lower section 121b of the first pipe fitting is continuous and does not allow air flow or substances to pass through. Thus, the wood shavings complete the adjustment of their postures and the correction of their shapes during the process of falling through the upper section 121a of the first pipe fitting.

[0056] Preferably, the central angle of the conical expansion sector of the upper section 121a of the first pipe fitting is 90°.

[0057] Embodiment 3

[0058] Reference Figure 5 As shown, different from Embodiment 1 or 2, the second pipe fitting 131 in this embodiment includes an upper section 131a and a lower section 131b of the second pipe fitting. Among them, the upper section 131a of the second pipe fitting is made of a one-way film made of a frame, and the allowed passing direction is from the outside to the inside of the second pipe fitting. The blowing mechanism 160 is an annular air knife, which is disposed around the upper section 131a of the second pipe fitting through the housing 110 and can blow air towards the second pipe fitting 131.

[0059] Particularly, in this embodiment, the inner diameters of the rings formed by the annular pipes of the first annular nozzle 151 to the fourth annular nozzle 154 increase in sequence, generally increasing by 3 - 5%. The distance from the bottom surface of the second annular nozzle 152 to the top surface of the third annular nozzle 153 is equal to the distance from the bottom surface of the third annular nozzle 153 to the top surface of the fourth annular nozzle 154, about 10 - 20 cm. The first annular nozzle 151 is located at a height far from the second annular nozzle 152, and the distance from the bottom surface of the first annular nozzle 151 to the top surface of the second annular nozzle 152 is about 100 cm. At the same time, the atomizing nozzle of the first annular nozzle 151 sprays vertically downward, and the spraying directions of the atomizing nozzles of the second annular nozzle 152, the third annular nozzle 153, and the fourth annular nozzle 154 face the side of the discharge port 133 and incline downward, and the inclination angle forms an angle of 30 - 60° with the horizontal plane, preferably 45°.

[0060] Control Example

[0061] The control example is a particleboard prepared by the sizing method of the prior art. Specifically, the dried particles are sprayed with the adhesives that have been mixed in the air duct, then enter the glue mixer for the glue mixing process, and finally enter the processes of assembling the billets and pressing to obtain the particleboard.

[0062] Table 1 shows the experimental data of the internal bond strength of the particleboards made from the particles of Examples 1-3 and the control example.

[0063] Table 1. Comparison table of the internal bond strength of the particleboards made from the particles of Examples 1-3 and the control example

[0064] Example <![CDATA[Average actual sizing amount (kg / m 3 )]]> Internal bonding strength (MPa) Example 1 85-88 0.73 Example 2 85-88 0.77 Example 3 85-88 0.78 Control example 101-105 0.65

[0065] It can be observed that, compared with the prior art, the actual sizing amount of the particles in Examples 1-3 of the present invention is lower, but the internal bond strength of the obtained plywood is higher. In particular, Example 3 has the optimal internal bond strength because the structure of the annular glue spraying mechanism is optimized, improving the mixing uniformity and mixing efficiency of each component of the adhesive.

[0066] The above description is for illustrative purposes and not for limitation. Many embodiments and many applications other than the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but should be determined by reference to the appended claims and the full scope of the equivalents of those claims. For the sake of completeness, all articles and references including patent applications and publications are incorporated herein by reference. Omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to abandon that subject matter, nor should it be considered that the applicant has not considered that subject matter as part of the disclosed subject matter of the application.

Claims

1. Precision sizing device for wood shavings, characterized in that, Comprising: A housing, which is vertically arranged; A suction channel, which is vertically arranged inside the housing; A blanking channel, which is arranged inside the housing, surrounds the suction channel and is coaxial with it. The top end of the blanking channel is provided with a feeding port, and the bottom end is provided with a discharging port. The blanking channel has a tendency to narrow from top to bottom, and the width of the lower section of the blanking channel is 2 - 5 mm; A suction mechanism, which can form a suction air flow from the blanking channel into the inside of the suction channel; And An annular glue spraying mechanism, which is arranged around the lower section of the blanking channel and can spray adhesive towards the discharging port; The suction channel is formed by enclosing with a first pipe fitting. The first pipe fitting includes a first pipe fitting upper section and a first pipe fitting lower section which are connected. The first pipe fitting upper section is narrow at the top and wide at the bottom, and the first pipe fitting lower section has the same diameter everywhere. The blanking channel is formed by enclosing with a second pipe fitting sleeved outside the first pipe fitting and the first pipe fitting; At least the first pipe fitting upper section is made of a one-way film, and the allowed passing direction is from the outside of the first pipe fitting towards the inside. The top of the first pipe fitting is closed, and the suction mechanism sucks at the bottom of the first pipe fitting; The wood shavings enter from the feeding port and fall in the blanking channel under the action of their own weight. After the suction mechanism is started, an adsorption force is formed on the wall surface of the blanking channel. This adsorption force can adjust the posture of the wood shavings to be in a posture attached to the wall surface and correct the shape of the wood shavings to have a lower degree of curl.

2. The precise sizing device for wood shavings according to claim 1, wherein The first pipe fitting upper section is conical, and the central angle of its developed sector is 90°.

3. The precise sizing device for wood chips according to claim 1, characterized in that, At least the upper section of the second pipe fitting is made of a one-way film, and the allowed passing direction is from the outside of the second pipe fitting towards the inside. A blowing mechanism is arranged around the upper part of the second pipe fitting and can blow air towards the second pipe fitting.

4. The precise sizing device for wood chips according to claim 1, characterized in that, The annular glue spraying mechanism includes a first annular spray head, a second annular spray head, a third annular spray head and a fourth annular spray head which are installed through the housing and stacked from top to bottom. The first annular spray head, the second annular spray head, the third annular spray head and the fourth annular spray head are all atomizing spray heads and are respectively connected to a glue liquid source, a curing agent source, an auxiliary agent source and a functional medicament source through hydraulic pumps by pipelines.

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