Dispersing device of polyurethane adhesive for wood artificial board

Abstract

The invention relates to the technical field of polyurethane adhesive manufacturing, and particularly discloses a dispersion device of a polyurethane adhesive for wood artificial boards, which comprises a surfactant supply device, a water supply device, an adhesive supply device, a premixing device, a main mixing device and a control system, the surface active agent supplying device, the water supplying device and the glue supplying device are respectively connected with the premixing device through pipelines, and a premixing discharging port of the premixing device is connected with a main mixing feeding port of the main mixing device through a pipeline. The pre-mixing device comprises a pre-mixing tank body, a spiral conveyor and a pre-mixing motor; the spiral conveyor and the pre-mixing tank body are coaxially arranged in the pre-mixing tank body; the pre-mixing motor is used for driving the spiral conveyor; the main mixing device comprises a main mixing tank body, a main dispersing unit, an ultrasonic transducer mounted on the outer vertical surface of the main mixing tank body, and an ultrasonic generator in circuit connection with the ultrasonic transducer; wherein the pre-mixing discharge port is connected with the main mixing feed port through a pressure pump.

Description

Technical Field

[0001] The present application relates to the technical field of manufacturing polyurethane adhesive (MDI) for wood-based panels, and in particular to a dispersing device for producing and processing polyurethane adhesive (MDI) for wood-based panels, which can be used to prepare a suspension of polyurethane adhesive (MDI). Background Art

[0002] Wood-based panels are obtained by mixing wood fibers or wood shavings with adhesives and hot pressing. At present, polyurethane adhesives are commonly used to bond wood fibers or wood shavings. When applying glue, the pre-mixed polyurethane adhesive is poured into the adhesive tank and then sprayed on the surface of the wood fibers or wood shavings through the output pump. For example, a mixing chamber is recorded in the utility model patent with the publication number CN213797118U and the name "an automatic glue application device for fiberboard manufacturing", wherein the adhesive tank is connected to the mixing chamber through a pipeline, and a glue spray nozzle is connected in the mixing chamber, a pump is provided on the pipeline, and the pump is connected to a frequency converter, and an electronic belt scale is provided in the wood fiber transmission chamber, and the frequency converter and the electronic belt scale are electrically connected to the controller. The adhesive is sprayed on the surface of the wood fiber entering the mixing chamber through the nozzle, and the uniformity of the mixing is ensured by secondary stirring.

[0003] However, the wettability of polyurethane adhesive is general, and it is not easy to fully and evenly spray the surface of fiber or wood shavings. Secondary stirring easily generates local high heat, which leads to pre-curing of adhesive, which makes the hygroscopicity of artificial board higher and the mechanical strength weaker. Therefore, the prior art often improves this problem by increasing the amount of glue applied. In fact, increasing the amount of glue applied will increase the production cost and the density of artificial board, but the effect of improving the hygroscopicity and mechanical strength of artificial board is not good. Summary of the invention

[0004] The present application provides a dispersing device for a polyurethane adhesive for wood-based panels, which can prepare a suspension of polyurethane adhesive (MDI). The use of the suspension of polyurethane adhesive (MDI) can reduce the amount of adhesive applied and reduce costs, so that the MDI adhesive can relatively evenly wet and cover the surface of wood fibers or wood shavings, thereby improving the mechanical strength of the prepared product (density board or particle board) and reducing hygroscopicity.

[0005] In one aspect, the present application provides a dispersing device for a polyurethane adhesive for a wood-based panel, comprising a surfactant providing device, a water supply device, a glue supply device, a premixing device, a main mixing device and a control system, wherein the surfactant providing device, the water supply device and the glue supply device are respectively connected to pipelines of the premixing device, and a premixing outlet of the premixing device is connected to a main mixing inlet pipeline of the main mixing device. The premixing device comprises a premixing tank, a screw conveyor coaxially arranged in the premixing tank, and a premixing motor driving the screw conveyor, wherein the outer edge of the screw blade of the screw conveyor abuts against the inner wall surface of the premixing tank, and the premixing tank is provided with a premixing inlet connected to the pipeline of the glue supply device, and the premixing inlet is located on the feeding side of the screw conveying rod; The main mixing device is vertically arranged, and comprises a main mixing tank body, a main dispersing unit, an ultrasonic transducer installed on the outer facade of the main mixing tank body, and an ultrasonic generator connected to the ultrasonic transducer circuit. The main mixing inlet is opened in the lower part of the main mixing tank body, and the main mixing outlet is opened in the upper part of the main mixing tank body. The main dispersing unit comprises a main dispersing shaft coaxially arranged in the main mixing tank body, a main dispersing motor driving the main dispersing shaft, and a main dispersing blade arranged on the main dispersing shaft. The main dispersing shaft has a chamber inside, an electronic generator is installed in the chamber, and the chamber is connected to the outside through an upper through hole. Wherein, the premixing outlet is connected to the main mixing inlet via a pressure pump.

[0006] Preferably, the main dispersing paddle is arranged at a height higher than the main mixing inlet.

[0007] Preferably, the bottom end of the upper through hole is connected to a discharge cavity through an upper expansion cavity.

[0008] Preferably, the main mixing device also includes a main mixing unit, which includes a main mixing shaft coaxially arranged in the main mixing tank body, a main mixing motor driving the main mixing shaft, and a main mixing blade arranged on the main mixing shaft, wherein the main mixing shaft has a chamber inside, an electronic generator is installed in the chamber, and the chamber is connected to the outside through a lower through hole.

[0009] Preferably, a diffusion blade is further provided on the main mixing shaft, and the diffusion blade includes a hollow diffusion rod, the hollow interior of the diffusion rod is connected to the lower through hole, and the surface of the diffusion rod facing the main mixing blade has a diffusion hole connected to the interior of the hole center thereof.

[0010] Preferably, the diffusion blade also includes a stirring blade, the free end of the stirring blade vertically extends toward the main mixing blade to form a connecting rod, one end of the diffusion rod is fixed to the main mixing shaft, and the other end is fixed to the connecting rod.

[0011] Preferably, the space of the main mixing tank body suitable for installing the main dispersing unit and the space of the main mixing unit suitable for installing the main mixing unit are separated by a flow stabilizing plate, and the flow stabilizing plate is provided with flow holes.

[0012] Preferably, the outer edge of the spiral blade is provided with a wear-resistant gasket.

[0013] Preferably, the premixing tank body is vertically arranged, the premixing inlet is arranged at the upper part of the premixing tank body, and the premixing outlet is arranged at the lower part of the premixing tank body.

[0014] Preferably, the premixing tank body is provided with a plurality of flow ports at equal intervals, the spacing between the plurality of flow ports is equal to the spiral pitch of the spiral blades, one of the flow ports is connected to the water supply device pipeline through a solenoid valve, and an adjacent flow port is connected to the surfactant providing device pipeline through a solenoid valve.

[0015] The present application provides a dispersing device for a polyurethane adhesive for wood-based panels, which can disperse pure polyurethane adhesive (MDI) in water, and form small particles of adhesive liquid wrapped by water droplets in the suspension of the prepared polyurethane adhesive (MDI), so that the adhesive can fully contact with wood fibers or wood shavings and fully wet their surfaces by virtue of the wettability of water. At the same time, according to different suspension ratios, when pure polyurethane adhesive (MDI) in a suspension of an equal amount of polyurethane adhesive (MDI) is applied, the actual amount of adhesive used is less than that of the prior art. Thus, the problem of polyurethane adhesive (MDI) being difficult to apply glue evenly can be improved, the wettability of polyurethane adhesive (MDI) can be improved, and the amount of glue applied can be reduced, the cost can be reduced, and the prepared product (density board or particle board) has relatively high mechanical strength and relatively low hygroscopicity.

[0016] In particular, in the present application, by means of quantitative delivery of the screw conveyor and the arrangement of the main dispersing unit and the main mixing unit, the suspension of the polyurethane adhesive (MDI) obtained in real time can be sprayed on the surface of the wood fiber or wood shavings immediately through the output pump of the prior art, thereby avoiding the influence of the dispersion of the adhesive in the suspension of the polyurethane adhesive (MDI) by configuring the suspension of the polyurethane adhesive (MDI) in advance, and improving the stability of the suspension of the polyurethane adhesive (MDI). BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 This is a schematic structural diagram of a dispersing device for a polyurethane adhesive for wood-based panels provided in Example 1 of the present application.

[0019] Figure 2 This is a schematic cross-sectional structure diagram of a dispersing device for a polyurethane adhesive for wood-based panels provided in Example 1 of the present application.

[0020] Figure 3 This is a schematic diagram of the structure of the main mixing device provided in Example 1 of the present application.

[0021] Figure 4 This is a schematic diagram of the structure of the main dispersion unit provided in Example 1 of the present application.

[0022] Figure 5 This is a schematic structural diagram of a dispersing device for a polyurethane adhesive for wood-based panels provided in Example 2 of the present application.

[0023] Figure 6 This is a schematic structural diagram of a dispersing device for a polyurethane adhesive for wood-based panels provided in Example 3 of the present application.

[0024] Figure 7 This is a schematic diagram of the structure of the main mixing device provided in Example 3 of the present application.

[0025] Figure 8 This is a schematic diagram of the structure of the main mixing unit provided in Example 3 of the present application.

[0026] In the above figure: 1. surfactant supply device, 2. water supply device, 3. glue supply device, 4. pre-mixing device, 5. main mixing device, 6. pressure pump, 41. pre-mixing tank, 42. screw conveyor, 43. pre-mixing motor, 44. pre-mixing inlet, 45. pre-mixing outlet, 46. circulation port, 51. main mixing tank, 52. main dispersing unit, 53. ultrasonic transducer, 54. ultrasonic generator, 55. main mixing inlet, 56. main mixing outlet , 57. electron generator, 58. main mixing unit, 59. flow stabilizer, 521. main dispersion shaft, 522. main dispersion motor, 523. main dispersion blade, 524. upper through hole, 525. upper expansion cavity, 526. discharge cavity, 581. main mixing shaft, 582. main mixing motor, 583. main mixing blade, 584. lower through hole, 585. diffusion blade, 5851. diffusion rod, 5852. diffusion hole, 5853. stirring blade, 5854. connecting rod. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application. Example

[0028] Reference Figure 1 , Figure 2 The dispersing device of polyurethane adhesive for wood-based panels shown in the figure comprises a surfactant supply device 1, a water supply device 2, a glue supply device 3, a premixing device 4, a main mixing device 5 and a control system. The surfactant supply device 1, the water supply device 2 and the glue supply device 3 are configured to store surfactants, water and polyurethane adhesive (MDI) respectively, and can be controlled by the control system to provide corresponding raw materials to the premixing device 4 in a quantitative and constant speed, and the three can be any feasible structure in the prior art. The control system can also be any one of the prior art, such as a PLC controller.

[0029] The premixing device 4 is vertically arranged, and includes a premixing tank 41, and a premixing inlet 44 and a flow port 46 are provided on the upper part of the premixing tank 41. The premixing inlet 44 is connected to the glue supply device 3 through necessary components such as a solenoid valve, a pump, and a pipeline, and is configured to allow the polyurethane adhesive (MDI) to enter the premixing tank 41. The flow port 46 is connected to the surfactant supply device 1 and the water supply device 2 through necessary components such as a solenoid valve, a pump, and a pipeline, and is configured to allow the surfactant and water to enter the premixing tank 41. The premixing tank 41 has a cylindrical internal space, and a screw conveyor 42 is coaxially installed inside it. The high end of the screw conveyor 42 extends out of the top surface of the premixing tank 41 and is connected to the motor shaft of the premixing motor 43 through a coupling. The premixing motor 43 is any motor such as an auger motor or a servo motor that can drive the screw conveyor 42 to rotate. The lower end of the screw conveyor 42 is connected to the bottom surface of the premixing tank 41 through a flange. The outer edge of the spiral blade of the screw conveyor 42 abuts against the inner wall surface of the premixing tank 41. Preferably, the outer edge of the spiral blade has a wear-resistant gasket, such as a PP or PVC wear-resistant film. At this time, the premixing feed port 44 is located on the feeding side of the screw conveying rod 42.

[0030] The premixing motor 43 , the solenoid valve, the pump and other components of the premixing device 4 are all electrically connected to and controlled by the control system.

[0031] Combination Figure 3 , Figure 4The main mixing device 5 is vertically arranged, and includes a main mixing tank body 51, which has a cylindrical internal space and a rectangular outer wall shape. A main mixing inlet 55 is provided at the lower part of the main mixing tank body 51, and a main mixing outlet 56 is provided at the upper part. A premixing outlet 45 is provided at the lower part of the premixing tank body 41, and the premixing outlet 45 is connected to the main mixing inlet 55 through a pressure pump 6, a pipeline, and in some cases, necessary components such as valves and pumps. The pressure pump 6 can be any one of the prior art that can pump the premixed mixed glue liquid to the main mixing tank body 51 until the mixed glue liquid leaves the main mixing tank body 51 through the main mixing outlet 56. A main dispersing unit 52 is coaxially installed inside the main mixing tank body 51. The main dispersing unit 52 includes a main dispersing shaft 521 coaxially arranged in the main mixing tank body 51, and the top end of the main dispersing shaft 521 extends out of the top surface of the main mixing tank body 51 and is connected to the motor shaft of the main dispersing motor 522 through a coupling. The main dispersing motor 522 is any motor such as a servo motor that can drive the main dispersing shaft 521 to rotate. The lower part of the main dispersing shaft 521 is welded or screwed with a main dispersing blade 523. In particular, the main dispersing blade 523 is arranged at a height higher than the main mixing inlet 55.

[0032] The upper part of the main dispersion shaft 521 has a chamber inside, and an electron generator 57 is arranged in the chamber, and the electron generator 57 is screwed and grounded on the coupling. The main dispersion shaft 521 has an upper through hole 524 coaxial with it, and the chamber is connected with the space below the main dispersion blade 523 through the upper through hole 524. Preferably, the bottom end of the upper through hole 524 is connected with a discharge chamber 526 through an upper expansion chamber 525, so that the thermal electrons generated by the electron generator are injected into the suspension through the upper through hole 524, the upper expansion chamber 525, and the discharge chamber 526.

[0033] An ultrasonic transducer 53 is installed on the outer facade of the main mixing tank body 51, and an ultrasonic generator 54 is installed below the main mixing tank body 51. The ultrasonic generator 54 and the electronic generator 57 are connected through a circuit. The main dispersion motor 522, the ultrasonic transducer 53, the ultrasonic generator 54 and the electronic generator 57 are electrically connected to and controlled by the control system.

[0034] The working principle of the dispersing device of the polyurethane adhesive for wood-based panels of this embodiment is as follows: The control system controls the surfactant providing device 1, the water supply device 2, and the adhesive supply device 3 to pass the surfactant, water, and polyurethane adhesive (MDI) into the premixing device 41 according to the set ratio, and the premixing motor 43 drives the screw conveyor 42 to premix the surfactant, water, and polyurethane adhesive (MDI) to obtain a mixed adhesive liquid, and intermittently pumps the mixed adhesive liquid into the main mixing tank 51, and the pumping amount each time does not exceed the capacity of the main mixing tank 51. Preferably, the capacity of the main mixing tank 51 is greater than or equal to the amount of the mixed adhesive liquid that can be accommodated in the gap between the spiral blades of the screw conveyor 42, and less than or equal to twice the amount. The mixed adhesive liquid is fully dispersed in the surfactant and water in the main mixing tank 51 by the action of the main dispersing unit 52, the ultrasonic transducer 53, the ultrasonic generator 54, and the electronic generator 57 to obtain a suspension of polyurethane adhesive (MDI). Finally, it is pumped and sprayed on the surface of wood fiber or wood shavings by the output pump of the prior art.

[0035] Since the main mixing tank 51 of this embodiment can disperse the polyurethane adhesive (MDI) in small amounts and multiple times, a suspension of the polyurethane adhesive (MDI) with good dispersion can be obtained.

[0036] Embodiment 2: Embodiment 2 differs from Embodiment 1 in that, referring to Figure 5 As shown, a plurality of flow openings 46 are evenly spaced on the premixing tank body 41, and the spacing between the plurality of flow openings 46 is equal to the spiral spacing of the spiral blades. One flow opening 46 is connected to the pipeline of the water supply device 2 through a solenoid valve, and an adjacent flow opening 46 is connected to the pipeline of the surfactant providing device 1 through a solenoid valve.

[0037] In this embodiment, the surfactant and water are added to the polyurethane adhesive (MDI) in small amounts for multiple times, so that the premixing effect of the premixing device 4 can be improved.

[0038] Embodiment 3: Embodiment 3 differs from Embodiment 2 in that, referring to Figure 6-8 As shown, the main mixing device 5 also includes a main mixing unit 58, which is coaxially arranged with the main dispersing unit 52 and is located below the main dispersing unit 52. The main mixing unit 58 includes a main mixing shaft 581 coaxially arranged in the main mixing tank body 51, and the lower end of the main mixing shaft 581 extends out of the bottom surface of the main mixing tank body 51 and is connected to the motor shaft of the main mixing motor 582 through a coupling. The main mixing motor 582 is any motor such as a servo motor that can drive the main mixing shaft 581 to rotate.

[0039] The lower part of the main mixing shaft 581 has a chamber inside, and an electron generator 57 is also arranged in the chamber. The electron generator 57 is screwed and mounted on the coupling. A lower through hole 584 coaxial with the main mixing shaft 581 is provided inside, and the chamber is connected to the outside through the lower through hole 584. Preferably, the lower through hole 584 is connected to the chamber through a lower expansion cavity 587, so that the thermal electrons generated by the electron generator pass through the lower expansion cavity 587 and the lower through hole 584 and are injected into the suspension.

[0040] A main mixing blade 583 is screwed or welded to the middle of the main mixing shaft 581 . In particular, the main mixing blade 583 is arranged at a height higher than the main mixing inlet 55 .

[0041] The upper part of the main mixing shaft 581 is provided with a diffusion blade 585 screwed or welded. The diffusion blade 585 includes a hollow diffusion rod 5851 and a stirring blade 5853. The hollow interior of the diffusion rod 5851 is connected to the lower through hole 584, and the surface of the diffusion rod 5851 facing the main mixing blade 583 has a plurality of diffusion holes 5852 connected to the inner hole of the diffusion rod 5851. The free end of the stirring blade 5853 extends vertically toward the main mixing blade 583 to form a connecting rod 5854, and one end of the diffusion rod 5851 is fixed to the main mixing shaft 581, and the other end is fixed to the connecting rod 5854.

[0042] Preferably, the space of the main mixing tank 51 suitable for installing the main dispersing unit 52 and the space suitable for installing the main mixing unit 58 are separated by a flow stabilizing plate 59 , and a flow hole 591 is opened on the flow stabilizing plate 59 .

[0043] The working principle of the dispersing device of the polyurethane adhesive for wood-based panels of this embodiment is as follows: The control system controls the surfactant, water, and polyurethane adhesive (MDI) in the surfactant supply device 1, the water supply device 2, and the adhesive supply device 3 to be passed into the premixing device 41 at a set ratio and flow rate, and the premixing motor 43 drives the screw conveyor 42 to premix the surfactant, water, and polyurethane adhesive (MDI) to obtain a mixed adhesive solution, and the mixed adhesive solution is pumped into the main mixing tank 51 at a set conveying speed. Preferably, the capacity of the main mixing tank 51 is greater than or equal to the amount of the mixed adhesive solution that can be accommodated in the gap between the spiral blades of the screw conveyor 42, and less than or equal to twice the amount. The mixed adhesive solution is fully dispersed in the surfactant and water in the main mixing tank 51 by the main dispersion unit 52, the main mixing unit 58, the ultrasonic transducer 53, the ultrasonic generator 54, and the electronic generator 57 to obtain a suspension of polyurethane adhesive (MDI). As the mixed glue liquid is continuously introduced into the main mixing tank 51, the suspension of the polyurethane adhesive (MDI) dispersed in the main mixing tank 51 is continuously outputted from the main mixing outlet 56, thereby enabling real-time mixing and real-time glue spraying, and improving the stability of the suspension of the polyurethane adhesive (MDI).

[0044] The above description is intended to be illustrative and not limiting. Upon reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the applicant has not considered the subject matter to be part of the disclosed application subject matter.

Claims

1. A dispersing device for polyurethane adhesive for wood-based panels, comprising a surfactant providing device (1), a water supply device (2), a glue supply device (3), a premixing device (4), a main mixing device (5) and a control system, wherein the surfactant providing device (1), the water supply device (2) and the glue supply device (3) are respectively connected to the premixing device (4) through a pipeline, and a premixing outlet (45) of the premixing device (4) is connected to a main mixing inlet (55) of the main mixing device (5) through a pipeline, characterized in that: The premixing device (4) comprises a premixing tank (41), a screw conveyor (42) coaxially arranged in the premixing tank (41), and a premixing motor (43) driving the screw conveyor (42), the outer edge of the screw blade of the screw conveyor (42) abutting against the inner wall surface of the premixing tank (41), and the premixing tank (41) is provided with a premixing inlet (44) connected to the pipeline of the glue supply device (3), and the premixing inlet (44) is located on the feeding side of the screw conveying rod (42); The main mixing device (5) is vertically arranged, and comprises a main mixing tank body (51), a main dispersing unit (52), an ultrasonic transducer (53) installed on the outer surface of the main mixing tank body (51), and an ultrasonic generator (54) connected to the ultrasonic transducer (53) by circuit. The main mixing inlet (55) is opened at the lower part of the main mixing tank body (51), and the main mixing outlet (56) is opened at the upper part of the main mixing tank body (51). The main dispersing unit (52) comprises a main dispersing shaft (521) coaxially arranged in the main mixing tank body (51), a main dispersing motor (522) driving the main dispersing shaft (521), and a main dispersing blade (523) arranged on the main dispersing shaft (521). The main dispersing shaft (521) has a chamber inside, an electronic generator (57) is installed in the chamber, and the chamber is connected to the outside through an upper through hole (524); The premixing outlet (45) and the main mixing inlet (55) are connected via a pressure pump (6).

2. The dispersing device for polyurethane adhesive for wood-based panels according to claim 1, characterized in that: The main dispersing blade (523) is arranged at a height higher than the main mixing inlet (55).

3. The dispersing device for polyurethane adhesive for wood-based panels according to claim 1, characterized in that: The bottom end of the upper through hole (524) is connected to a discharge cavity (526) through an upper expansion cavity (525).

4. The dispersing device for polyurethane adhesive for wood-based panels according to claim 1, characterized in that: The main mixing device (5) further comprises a main mixing unit (58), wherein the main mixing unit (58) comprises a main mixing shaft (581) coaxially arranged in the main mixing tank body (51), a main mixing motor (582) driving the main mixing shaft (581), and a main mixing blade (583) arranged on the main mixing shaft (581), wherein the main mixing shaft (581) has a chamber inside, an electron generator (57) is installed in the chamber, and the chamber is connected to the outside through a lower through hole (584).

5. The dispersing device for polyurethane adhesive for wood-based panels according to claim 4, characterized in that: The main mixing shaft (581) is also provided with a diffusion blade (585), and the diffusion blade (585) includes a hollow diffusion rod (5851), the hollow interior of the diffusion rod (5851) is connected to the lower through hole (584), and the surface of the diffusion rod (5851) facing the main mixing blade (583) has a diffusion hole (5852) connected to the interior of the hole center thereof.

6. The dispersing device for polyurethane adhesive for wood-based panels according to claim 5, characterized in that: The diffusion blade (585) further comprises a stirring blade (5853), wherein the free end of the stirring blade (5853) extends vertically toward the main mixing blade (583) to form a connecting rod (5854), and one end of the diffusion rod (5851) is fixed to the main mixing shaft (581), and the other end is fixed to the connecting rod (5854).

7. The dispersing device for polyurethane adhesive for wood-based panels according to claim 5, characterized in that: The space of the main mixing tank (51) suitable for installing the main dispersing unit (52) and the space suitable for installing the main mixing unit (58) are separated by a flow stabilizing plate (59), and the flow stabilizing plate (59) is provided with a flow hole (591).

8. The dispersing device for polyurethane adhesive for wood-based panels according to claim 1, characterized in that: The outer edge of the spiral blade is provided with a wear-resistant gasket.

9. The dispersing device for polyurethane adhesive for wood-based panels according to claim 7, characterized in that: The premixing tank body (41) is arranged vertically, the premixing inlet (44) is arranged at the upper part of the premixing tank body (41), and the premixing outlet (45) is arranged at the lower part of the premixing tank body (41).

10. The dispersing device of polyurethane adhesive for wood-based panels according to claim 1, characterized in that: The premixing tank (41) is provided with a plurality of flow openings (46) at equal intervals, the intervals between the plurality of flow openings (46) being equal to the spiral interval of the spiral blades, one of the flow openings (46) being connected to a pipeline of the water supply device (2) via a solenoid valve, and an adjacent flow opening (46) being connected to a pipeline of the active agent supply device (1) via a solenoid valve.

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