Two-color coloring system of wood-plastic board and two-color coloring mold of wood-plastic board

Abstract

The application discloses a double-color coloring system of a wood-plastic board and a double-color coloring mold of the wood-plastic board. The system comprises a coloring treatment module, a fabric supply unit, a wood-plastic board conveying unit, a fabric flow adjusting unit, a multi-parameter collaborative control module and a double-color boundary accurate temperature control and shaping module. The conveying unit sends the wood-plastic board to the middle part of the treatment module, and the supply unit provides different fabrics from both sides, and cooperates with the flow adjusting and uniform distribution units to realize continuous double-color coloring. The mold is composed of three mold plates, and the two kinds of fabrics are guided through independent internal flow channels to form double colors on the outside of the wood-plastic board. The system and the mold realize efficient and accurate double-color continuous coloring of the wood-plastic board through cooperation of the modules and the units and flow channel design.

Description

Technical Field

[0001] This invention belongs to the field of wood-plastic composite board processing technology, and particularly relates to a two-color coloring system for wood-plastic composite boards and a two-color coloring mold for wood-plastic composite boards. Background Technology

[0002] Wood-plastic composite boards are commonly used in fences. Currently, wood-plastic composite boards on the market are only available in a single color. Over time, this single color can lead to aesthetic fatigue and become relatively monotonous. As a result, two-color wood-plastic composite boards have gradually appeared on the market.

[0003] Currently, the two-color coloring of wood-plastic composite boards (WPC) mostly adopts a step-by-step processing mode. This involves first using one coloring machine to color and process one surface of the WPC, and then using another machine or adjusting existing equipment parameters to color the other parallel surface. This method suffers from a fragmented processing flow, requiring multiple positioning, conveying, and equipment adjustments of the WPC. This not only increases the complexity of process connections but may also introduce errors due to multiple positioning steps, affecting the consistency of the color boundaries between the two parallel surfaces.

[0004] Meanwhile, in existing coloring systems, the coordination between fabric supply and wood-plastic composite (WPC) board conveying is poor. Often, localized coloring needs to be completed while the WPC board is stationary before it moves, making continuous processing difficult and limiting processing efficiency. Furthermore, the fabric application process in traditional coloring equipment is easily affected by factors such as the WPC board's moving speed and the amount of fabric supplied, leading to uneven coloring and incomplete color coverage, making it difficult to meet the demands of large-scale, high-quality two-color coloring of WPC boards. Summary of the Invention

[0005] The purpose of this invention is to provide a two-color coloring system and a two-color coloring mold for wood-plastic composite boards, so as to solve the problems mentioned in the background art.

[0006] In view of this, the present invention provides a two-color coloring system for wood-plastic composite boards, including a coloring processing module, a fabric supply unit, a wood-plastic composite board conveying unit, a fabric flow adjustment unit, a multi-parameter collaborative control module, and a two-color boundary precise temperature control and shaping module.

[0007] The wood-plastic composite board conveying unit is used to convey the wood-plastic composite board to the processing area of ​​the coloring processing module along a preset path, so that the wood-plastic composite board passes through the middle position of the coloring processing module;

[0008] The fabric supply unit is configured to provide fabric of different colors to both sides of the coloring processing module.

[0009] The coloring module is used to receive fabrics of different colors from both sides of it and apply the fabrics to two parallel surfaces of the wood-plastic composite board to form different color layers on the two parallel surfaces.

[0010] The fabric flow rate adjustment unit is connected to the fabric supply unit and is used to regulate the flow rate of the fabric supplied by the fabric supply unit to the dyeing processing module in order to adapt to the moving speed of the wood-plastic board and the dyeing requirements.

[0011] The multi-parameter collaborative control module is electrically connected to the wood-plastic board conveying unit, the fabric supply unit, the coloring processing module, and the fabric flow adjustment unit, respectively. It is used to receive real-time data from each unit, calculate target parameters, and output control commands to each unit to realize the collaborative matching and dynamic adjustment of conveying speed and fabric flow during the two-color coloring process of wood-plastic board.

[0012] The dual-color boundary precision temperature control and shaping module is located at the outlet of the coloring process module. It is used to perform targeted temperature control on the boundary areas of different color layers on two parallel surfaces of the wood-plastic composite board. By adjusting the temperature environment of the boundary area, the curing speed of the fabric is controlled.

[0013] In a further embodiment of the present invention, the fabric supply unit includes a first fabric supply subunit and a second fabric supply subunit.

[0014] The first fabric supply subunit is connected to one side of the coloring processing module and is used to continuously supply fabric of the first color to one side of the coloring processing module.

[0015] The second fabric supply subunit is connected to the other side of the coloring processing module and is used to continuously supply fabric of the second color to the other side of the coloring processing module, wherein the first color and the second color are different colors.

[0016] In a further embodiment of the present invention, the coloring processing module is provided with a fabric distribution structure, which is used to guide the fabric from both sides to the corresponding wood-plastic composite board surface to be colored; the fabric distribution structure can adapt to the surface morphology of the wood-plastic composite board, so that the fabric forms a uniform working area when it contacts the surface of the wood-plastic composite board, so as to achieve the coloring processing of the corresponding surface of the wood-plastic composite board.

[0017] In a further embodiment of the present invention, the wood-plastic composite board conveying unit includes a conveying drive assembly and a path guiding assembly;

[0018] The conveying drive assembly is used to provide driving force so that the wood-plastic board moves continuously in a preset direction;

[0019] The path guiding component is used to limit the movement trajectory of the wood-plastic composite board, ensuring that the wood-plastic composite board maintains a preset posture as it passes through the middle position of the coloring processing module during movement, and that the two parallel surfaces of the wood-plastic composite board correspond to the fabric action areas on both sides of the coloring processing module.

[0020] In a further embodiment of the present invention, a fabric flow rate adjustment unit is also included. The fabric flow rate adjustment unit is connected to the fabric supply unit and is used to regulate the flow rate of the fabric supplied by the fabric supply unit to the coloring processing module in order to adapt to the moving speed of the wood-plastic composite board and the coloring requirements.

[0021] In a further embodiment of the present invention, the coloring processing module is provided with a fabric uniform distribution unit, which is used to uniformly process the fabric entering its interior so that the fabric forms a uniform fabric layer before contacting the surface of the wood-plastic composite board, and then the uniform fabric layer is applied to the corresponding surface of the wood-plastic composite board to be colored.

[0022] In a further embodiment of the present invention, the wood-plastic composite board conveying unit further includes a moving speed control subunit, which is used to adjust the moving speed of the wood-plastic composite board in the processing area of ​​the coloring processing module according to the coloring process requirements, so that the movement of the wood-plastic composite board is adapted to the fabric application process.

[0023] In a further embodiment of the present invention, a fabric recycling unit is also included. The fabric recycling unit is connected to the fabric supply unit and the dyeing processing module, and is used to recycle the fabric that has not been adsorbed by the surface of the wood-plastic composite board by the dyeing processing module and transport it to the fabric supply unit to realize the recycling supply of fabric.

[0024] In a further embodiment of the present invention, a coloring path positioning module is also included. The coloring path positioning module cooperates with the wood-plastic composite board conveying unit to position the wood-plastic composite board in space during the conveying process, so as to ensure that when the wood-plastic composite board passes through the middle position of the coloring processing module, its two parallel surfaces to be colored maintain a preset relative positional relationship with the fabric action areas on both sides of the coloring processing module.

[0025] The two-color coloring mold for wood-plastic composite board includes a first mold plate, a second mold plate, and a third mold plate that are stacked and assembled. A channel for the wood-plastic composite board to pass through is opened between the first mold plate, the second mold plate, and the third mold plate. On one side of the first mold plate, two first flow channels are arranged along the center of the channel on the outer side. Feed channels are opened on both sides of the first mold plate, and feed heads are installed on the feed channels. The feed heads are connected to feed pipes, and the feed channels are connected to the first flow channels. Corresponding second flow channels are opened on both sides of the second mold plate, and the first and second flow channels are connected. The second flow channels on the same side of the second mold plate are independent of each other, each representing two different colors on the outer side of the wood-plastic composite board. A third flow channel is opened on one side of the third mold plate, and the third flow channel is correspondingly connected to the second flow channel. The cooperation between the first, second, and third flow channels allows the two fabrics to be applied in two different colors along their respective independent channels on the outer side of the wood-plastic composite board.

[0026] The beneficial effects of this invention are:

[0027] The dual-color coloring system for wood-plastic composite boards integrates a coloring processing module, a fabric supply unit, and a wood-plastic composite board conveying unit, enabling simultaneous dual-color coloring of wood-plastic composite boards within a single system. This eliminates the need for separate processing of two parallel surfaces in each step, simplifying the processing flow, reducing positioning errors during process transitions, and improving processing continuity.

[0028] By supplying different colored fabrics to both sides of the coloring module through the fabric supply unit, and combining the coloring module with the directional application of the fabric, it is possible to accurately achieve differentiated coloring of the two parallel surfaces of the wood-plastic composite board, ensuring the targeted and accurate application of color.

[0029] The coordinated operation of the wood-plastic composite board conveying unit and the fabric supply unit enables the wood-plastic composite board to receive fabric synchronously during continuous movement, achieving continuous coloring of the entire wood-plastic composite board. This avoids the efficiency limitations of traditional static coloring and significantly improves processing efficiency.

[0030] Through the combination of structures such as the fabric distribution unit and the flow regulation unit, the fabric application process can be precisely controlled, reducing coloring defects caused by uneven fabric distribution or unstable supply, and ensuring the uniformity and integrity of the color on the surface of the wood-plastic composite board.

[0031] Through modular and unit-based design, the system has clearly defined functions and works in concert, which not only reduces the complexity of equipment debugging, but also provides flexible adjustment space for subsequent adjustment of parameters (such as moving speed and fabric supply) according to processing needs, adapting to the two-color coloring requirements of different specifications of wood-plastic composite boards.

[0032] A coloring mold consists of a first mold plate, a second mold plate, and a third mold plate, with a channel in the center that matches the cross-section of the wood-plastic composite board. Two different fabrics enter from both sides of the mold and pass through the feeding channel into the second and third flow channels. The fabric on one side enters its corresponding independent feeding channel, so that each fabric is evenly colored while the wood-plastic composite board moves synchronously, completing the two-color coloring in one go. This ensures two-color coloring under the same positioning reference and also improves efficiency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the two-color coloring mold for the wood-plastic composite board of the present invention. Figure 1 ;

[0034] Figure 2 This is a schematic diagram of the structure of the two-color coloring mold for the wood-plastic composite board of the present invention. Figure 2 . Detailed Implementation

[0035] The technical solutions in the embodiments of this application are clearly described below. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0036] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0037] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship, which are generally based on the orientation or positional relationship and are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0039] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0040] This embodiment provides a dual-color coloring system for wood-plastic composite boards, including a coloring processing module, a fabric supply unit, and a wood-plastic composite board conveying unit. The wood-plastic composite board conveying unit is used to convey the wood-plastic composite board to the processing area of ​​the coloring processing module along a preset path, so that the wood-plastic composite board passes through the middle position of the coloring processing module. The fabric supply unit is configured to provide fabrics of different colors to both sides of the coloring processing module. The coloring processing module is used to receive fabrics of different colors from both sides and apply the fabrics to two parallel surfaces of the wood-plastic composite board to form different color layers on the two parallel surfaces.

[0041] The coloring processing module forms a channel structure inside its processing area that adapts to the shape of the wood-plastic composite board. The cross-sectional profile of the channel structure matches the cross-sectional profile of the wood-plastic composite board, and the two side walls of the channel structure correspond to the two parallel surfaces of the wood-plastic composite board to be colored, respectively. A preset gap is maintained between the two side walls and the surface of the wood-plastic composite board to serve as the working space for the fabric application. The fabric provided by the fabric supply unit is transported to the corresponding side gap of the channel structure through a preset fabric conduction path inside the coloring processing module. After the fabric forms a stable adhesion layer in the gap, it contacts the surface of the wood-plastic composite board to complete the coloring operation.

[0042] In a further embodiment of the present invention, the fabric supply unit includes a first fabric supply subunit and a second fabric supply subunit. The first fabric supply subunit is connected to one side of the dyeing processing module and is used to continuously supply fabric of a first color to one side of the dyeing processing module. The second fabric supply subunit is connected to the other side of the dyeing processing module and is used to continuously supply fabric of a second color to the other side of the dyeing processing module, wherein the first color and the second color are different colors. Both the first and second fabric supply subunits include a fabric storage cavity, a conveying pump group, and a flow monitoring component. The fabric storage cavity is used to independently store fabric of the corresponding color. The conveying pump group adopts a drive structure with adjustable output pressure, which can continuously output fabric according to the dyeing requirements. The flow monitoring component collects the instantaneous conveying volume of the fabric in real time and feeds it back to the control terminal. The connection interface between the two subunits and the dyeing processing module is provided with a unidirectional flow guide structure to avoid mixing of fabrics of different colors at the interface.

[0043] In a further embodiment of this invention, the coloring processing module is provided with a fabric distribution structure. This structure guides fabric from both sides to the corresponding wood-plastic composite board surface to be colored. The fabric distribution structure adapts to the surface morphology of the wood-plastic composite board, ensuring a uniform working area when the fabric contacts the board surface, thus achieving coloring processing on the corresponding surface. The fabric distribution structure includes a guide chamber adapted to the contour of the wood-plastic composite board surface. The inlet of the guide chamber is connected to the output end of the fabric supply unit, and the outlet extends along the width direction of the wood-plastic composite board and maintains a preset distance from the board surface. Diverting ribs are provided within the guide chamber, radially distributed along the fabric flow direction, evenly distributing the fabric entering the chamber to various areas of the outlet. Simultaneously, an elastic fitting portion is provided at the outlet edge of the guide chamber, adaptively adjusting the fitting gap according to the slight undulations of the wood-plastic composite board surface to ensure the working area completely covers the surface to be colored without fabric leakage.

[0044] In a further embodiment of this invention, the wood-plastic composite board conveying unit includes a conveying drive assembly and a path guiding assembly. The conveying drive assembly provides driving force to continuously move the wood-plastic composite board along a preset direction. The path guiding assembly limits the movement trajectory of the wood-plastic composite board, ensuring that the board maintains a preset posture as it passes through the middle position of the coloring processing module during movement, and that the two parallel surfaces of the board correspond to the fabric application areas on both sides of the coloring processing module. The conveying drive assembly consists of multiple sets of conveying rollers arranged along the movement direction. The axis of the conveying rollers is perpendicular to the movement direction of the wood-plastic composite board, and the roller surfaces are made of elastic and wear-resistant material, allowing for adjustment of the pressure between the rollers to accommodate wood-plastic composite boards of different thicknesses. The drive component is connected to the conveying rollers via a transmission structure, enabling stepless speed regulation to ensure the stability of the wood-plastic composite board's movement speed. The path guiding component includes a lateral guiding unit and a vertical positioning unit. The lateral guiding unit consists of guide wheel sets symmetrically arranged on both sides of the wood-plastic composite board. The wheel surfaces of the guide wheel sets roll in contact with the sides of the wood-plastic composite board, limiting the offset of the wood-plastic composite board in the width direction. The vertical positioning unit consists of limit rollers arranged vertically and vertically. The limit rollers contact the unpainted surface of the wood-plastic composite board, maintaining the stability of the wood-plastic composite board in the height direction. This part is optional and will not be described in detail in this embodiment. Alternatively, the stepless speed regulation of the conveying drive component is achieved by a combination of "servo motor + planetary gear reducer + pulse width modulation control system". The servo motor is a permanent magnet synchronous servo motor with a rated power of 1.5kW and a rated speed of 3000r / min. Its output shaft is rigidly connected to the input end of the planetary gear reducer. The reducer transmission ratio can be selected in the range of 1:5 to 1:50 according to the requirements to adapt to the moving speed requirements of the wood-plastic composite board. The PWM control system is electrically connected to the servo motor driver and outputs a PWM signal with a frequency of 500-2000Hz. The signal adjusts the armature voltage of the servo motor, thereby controlling the motor speed. At the same time, the system has a built-in speed feedback unit, which uses a 1000-line encoder to collect the motor output shaft speed in real time. The data is transmitted to the controller for comparison with the preset speed. The PID algorithm corrects the duty cycle of the PWM signal, so that the speed control accuracy is stabilized within ±0.01m / min. This ensures that the wood-plastic board conveying speed is continuous, stable and adjustable, meeting the coloring rhythm requirements of wood-plastic boards of different thicknesses and materials.

[0045] A further embodiment of this invention includes a fabric flow rate adjustment unit connected to the fabric supply unit. This unit regulates the flow rate of fabric supplied by the fabric supply unit to the dyeing processing module to adapt to the moving speed of the wood-plastic composite board and the dyeing requirements. The fabric flow rate adjustment unit comprises a flow rate detection module, a control module, and an execution module. The flow rate detection module collects the volumetric or mass flow rate of the fabric in real time using sensors installed in the fabric delivery pipeline and transmits the detected data to the control module. The control module has a built-in flow rate and speed matching algorithm, which calculates the target flow rate value based on the moving speed signal fed back by the wood-plastic composite board delivery unit and preset dyeing thickness parameters. The execution module adjusts the opening of the flow control valve according to the instructions output by the control module, ensuring that the actual flow rate matches the target flow rate value. The adjustment process has dynamic response characteristics, capable of handling instantaneous changes in the moving speed of the wood-plastic composite board. The fabric flow rate adjustment unit calculates the target flow rate through three steps: parameter acquisition, formula calculation, and dynamic correction. First, the parameter acquisition module obtains key data via sensors: 1) the real-time moving speed V (m / min) of the wood-plastic composite board via the encoder of the wood-plastic composite board conveying unit; 2) the actual width W (m) of the wood-plastic composite board via a laser width measuring instrument; 3) the target fabric layer thickness H (m) based on the preset dyeing process; and 4) the density ρ (kg / L) of the currently used fabric via the density detector of the fabric supply unit. Simultaneously, it calls the system's built-in fabric viscosity database and determines the compensation coefficient K based on the detected fabric viscosity value (K increases by 0.01 for every 100 cP increase in viscosity, ranging from 0.05 to 0.1). Then, the target flow rate Q (L / min) is calculated using the preset formula Q = V × W × H × ρ × (1 + K). Here, V × W × H calculates the volume of the dyeing area on the wood-plastic composite board per unit time, multiplying it by the fabric density ρ to obtain the required fabric mass per unit time. Finally, (1 + K)... The system compensates for fabric loss during transport. Finally, the calculation module compares the target flow rate with the actual flow rate collected by the flow sensor. If the deviation exceeds ±2%, the compensation coefficient K is automatically corrected or feedback is sent to the conveying unit to adjust the moving speed, ensuring that the flow rate calculation result accurately matches the actual coloring requirements.

[0046] The wood-plastic composite board conveying unit includes a conveying drive assembly and a moving speed control subunit, which work together through mechanical transmission and electrical control signal interaction. Specifically, the conveying drive assembly consists of multiple sets of conveying rollers arranged linearly along the conveying direction of the wood-plastic composite board, a permanent magnet synchronous servo motor, and a planetary gear reducer. Multiple sets of conveying rollers are provided, each containing a driving roller and a driven roller arranged vertically. The roller surfaces are made of silicone material and have anti-slip textures to provide stable friction while preventing damage to the wood-plastic composite board surface. One end of the driving roller is connected to the output shaft of the planetary gear reducer via a coupling, while the input end of the reducer is connected to the permanent magnet synchronous servo motor. The reducer's transmission ratio can be flexibly selected according to the thickness of the wood-plastic composite board, ensuring that the conveying drive force can cover the conveying requirements of different specifications of wood-plastic composite boards, ultimately allowing the wood-plastic composite board to move continuously along a preset horizontal conveying path. The moving speed control subunit is integrated into the electrical control box of the wood-plastic composite board conveying unit. Its core is a microcontroller. This subunit establishes a data connection with the fabric layer thickness sensor of the coloring processing module and the flow sensor of the fabric flow adjustment unit through a communication interface. It can obtain the fabric layer thickness deviation value and the actual flow value in real time. When it is detected that the moving speed of the wood-plastic composite board is not matched with the fabric application rhythm, the control subunit will output a speed adjustment signal to the servo motor driver of the conveying drive component according to the preset process parameter curve. This will gradually adjust the moving speed of the wood-plastic composite board in the processing area of ​​the coloring processing module until the thickness deviation and flow deviation return to the allowable range. Ultimately, it achieves precise matching between the movement of the wood-plastic composite board and the application of the fabric, avoiding incomplete coloring due to excessive speed or fabric accumulation due to excessively slow speed.

[0047] In a further embodiment of this invention, the coloring processing module includes a fabric uniform distribution unit. This unit homogenizes the fabric entering it, forming a uniform fabric layer before it contacts the wood-plastic composite board surface. The uniform fabric layer is then applied to the corresponding surface of the wood-plastic composite board to be colored. The fabric uniform distribution unit includes a pretreatment chamber and a uniform distribution chamber. The pretreatment chamber contains a stirring assembly and a filtering assembly. The stirring assembly uses rotating blades to shear and disperse the fabric, breaking up agglomerated particles. The filtering assembly uses a high-precision filter to remove impurities and undispersed particles from the fabric. The uniform distribution chamber contains a honeycomb rectifying structure composed of multiple microchannels parallel to the fabric flow direction. When the fabric flows through the microchannels, it forms a stable laminar flow state, resulting in a uniform distribution of fabric concentration and flow rate across the cross-section. The outlet of the uniform distribution chamber is equipped with a leveling component. The edge of the leveling component is parallel to the surface of the wood-plastic composite board, enabling the fabric layer thickness to be controlled within a preset range.

[0048] In a further embodiment of this invention, the wood-plastic composite board conveying unit further includes a moving speed control subunit. This subunit adjusts the moving speed of the wood-plastic composite board within the processing area of ​​the coloring module according to the coloring process requirements, ensuring the board's movement matches the fabric application process. The moving speed control subunit establishes a linkage with the fabric status monitoring component of the coloring module and the flow regulation unit of the fabric supply unit, enabling it to receive real-time parameters such as fabric viscosity and layer thickness. It internally stores multiple sets of process parameter curves, including optimal moving speed ranges for different fabric types. When thickness deviation or uniformity fluctuations are detected during fabric application, the control subunit automatically triggers a speed correction mechanism. By adjusting the output rotation speed of the conveying drive component, the moving speed of the wood-plastic composite board is synchronized with the fabric application rhythm. The correction process employs a gradual adjustment method to avoid sudden speed changes affecting the coloring quality. The progressive adjustment of the moving speed control subunit is based on the core logic of "deviation triggering - step correction - closed-loop stabilization". First, the thickness of the surface layer of the wood-plastic composite board is collected in real time by the laser thickness sensor built into the coloring module at a frequency of 10Hz. When a thickness deviation exceeding ±0.01mm is detected, the speed adjustment mechanism is triggered. During adjustment, the control subunit first determines the adjustment direction based on the thickness deviation value (decrease speed if the thickness is too high, increase speed if the thickness is too low), and then calculates the adjustment amount according to the rule of "each adjustment increment ≤ 5% of the current speed". For example, if the current moving speed of the wood-plastic composite board is 3m / min, and a speed reduction is needed, the initial adjustment is to 2.85m / min, and this adjustment is maintained for 0.5s. The system maintains a stable interval during which fabric layer thickness data is continuously collected. If the thickness deviation does not return to the allowable range after the interval, the system will make another adjustment, with an interval of no less than 0.5s between adjacent adjustments, until the thickness deviation is ≤ ±0.01mm. At the same time, the control subunit is linked with the fabric flow adjustment unit, and a speed change signal is sent to the flow unit synchronously after each speed adjustment to ensure that the flow calculation is updated in a timely manner. This avoids problems such as uneven dyeing, fabric accumulation, or omissions caused by sudden speed changes, and achieves a dynamic balance between speed and dyeing quality.

[0049] In a further embodiment of the present invention, a fabric circulation unit is also included. This fabric circulation unit is connected to the fabric supply unit and the dyeing processing module, and is used to recover fabric that has not been adsorbed by the wood-plastic composite board surface by the dyeing processing module and transport it to the fabric supply unit, thereby achieving a cyclical supply of fabric. The fabric circulation unit includes a recovery channel, a purification module, a temporary storage module, and a conveying module. The recovery channel is located below the fabric action area of ​​the dyeing processing module, and collects unadsorbed fabric to the recovery port through an inclined guide surface. The inner wall of the recovery channel is treated with an anti-stick coating to reduce fabric residue. The purification module includes a multi-stage filtration assembly and a degassing assembly. The filtration assembly removes impurities from the fabric and debris falling off the wood-plastic composite board surface through coarse and fine filtration sequentially. The degassing assembly removes air bubbles from the fabric through vacuum suction or ultrasonic treatment. The temporary storage module is used to temporarily store the purified fabric and has a built-in liquid level sensor to control the amount of fabric stored. The conveying module pressurizes and transports the fabric in the temporary storage module to the storage chamber of the fabric supply unit through a pump, and the conveying pipeline is equipped with a one-way valve to prevent fabric backflow.

[0050] A further embodiment of this invention includes a coloring path positioning module, which cooperates with the wood-plastic composite board conveying unit to position the wood-plastic composite board in space during the conveying process. This ensures that when the wood-plastic composite board passes through the middle of the coloring processing module, its two parallel surfaces to be colored maintain a preset relative positional relationship with the fabric action areas on both sides of the coloring processing module. The coloring path positioning module includes a visual positioning unit and a position adjustment unit. The visual positioning unit consists of an image acquisition device positioned before the wood-plastic composite board enters the coloring processing module. By capturing the edge contour and feature marks of the wood-plastic composite board, and combining image recognition algorithms, it calculates the deviation between the actual position coordinates of the wood-plastic composite board and the preset path. The position adjustment unit is linked with the guide components of the wood-plastic composite board conveying unit. When the deviation exceeds a preset threshold, it corrects the position of the wood-plastic composite board in real time by driving the displacement of the lateral guide wheel group or adjusting the speed difference of the conveying roller group. The correction process adopts a closed-loop control mode to ensure that the position deviation is controlled within the allowable range.

[0051] The dual-color coloring system for wood-plastic composite boards integrates a coloring processing module, a fabric supply unit, and a wood-plastic composite board conveying unit, enabling simultaneous dual-color coloring of wood-plastic composite boards within a single system. This eliminates the need for separate processing of two parallel surfaces in each step, simplifying the processing flow, reducing positioning errors during process transitions, and improving processing continuity.

[0052] By supplying different colored fabrics to both sides of the coloring module through the fabric supply unit, and combining the coloring module with the directional application of the fabric, it is possible to accurately achieve differentiated coloring of the two parallel surfaces of the wood-plastic composite board, ensuring the targeted and accurate application of color.

[0053] The coordinated operation of the wood-plastic composite board conveying unit and the fabric supply unit enables the wood-plastic composite board to receive fabric synchronously during continuous movement, achieving continuous coloring of the entire wood-plastic composite board. This avoids the efficiency limitations of traditional static coloring and significantly improves processing efficiency.

[0054] Through the combination of structures such as the fabric distribution unit and the flow regulation unit, the fabric application process can be precisely controlled, reducing coloring defects caused by uneven fabric distribution or unstable supply, and ensuring the uniformity and integrity of the color on the surface of the wood-plastic composite board.

[0055] Through modular and unit-based design, the system has clearly defined functions and works in concert, which not only reduces the complexity of equipment debugging, but also provides flexible adjustment space for subsequent adjustment of parameters (such as moving speed and fabric supply) according to processing needs, adapting to the two-color coloring requirements of different specifications of wood-plastic composite boards.

[0056] The multi-parameter collaborative control module uses an industrial-grade PLC as its core control unit. Its hardware interfaces establish electrical connections with the wood-plastic composite board conveying unit, fabric supply unit, coloring processing module, and fabric flow regulation unit through different communication methods: With the wood-plastic composite board conveying unit, it receives real-time servo motor speed signals from the conveying drive component and speed adjustment status signals from the moving speed control subunit, while simultaneously outputting speed setting commands; with the fabric supply unit, it receives liquid level signals from the fabric buffer tanks of the first and second fabric supply subunits and real-time pressure signals from the pressure compensation valve, and outputs pressure regulation commands; with the coloring processing module, it receives thickness sensor detection data from the fabric application area and working status signals from the fabric distribution unit, while simultaneously outputting start / stop and parameter adjustment commands for the distribution unit; with the fabric flow regulation unit, it receives real-time flow data from the flow sensor and target flow calculation results through a specific communication method, and outputs flow regulation commands. In terms of functionality, this module incorporates a "speed-flow-thickness" linkage control algorithm. First, the data acquisition module aggregates real-time data from each unit. Then, the core calculation module calculates the target parameters according to a preset formula. Finally, the instruction output module sends control signals to the corresponding units. For example, when an increase in the speed of the wood-plastic composite board is detected, the calculation module updates the target flow rate synchronously and outputs an instruction to increase the flow rate to the fabric flow rate adjustment unit. At the same time, it sends a speed stabilization instruction to the moving speed control subunit to ensure that the fabric supply is synchronously matched during the increase in conveying speed. If the coloring processing module reports that the fabric layer thickness deviation exceeds the allowable range, the module prioritizes outputting a progressive speed adjustment instruction to the moving speed control subunit and synchronously links the fabric flow rate adjustment unit to correct the flow rate. Ultimately, this achieves coordinated matching and dynamic adjustment of conveying speed and fabric flow rate during the two-color coloring process of the wood-plastic composite board, ensuring the stability and consistency of coloring quality.

[0057] The dual-color boundary precision temperature control and shaping module is located at the outlet of the coloring process module. It is used to perform targeted temperature control on the boundary areas of different color layers on two parallel surfaces of the wood-plastic composite board. By adjusting the temperature environment of the boundary area, the curing speed of the fabric is controlled. The dual-color boundary precision temperature control and shaping module includes a boundary recognition component, a zone temperature control component, and a temperature monitoring component. The boundary recognition component uses optical detection technology to locate the boundary position of the two color layers on the surface of the wood-plastic composite board, ensuring that the temperature control area is accurately matched. The zone temperature control component uses differentiated temperature control for the boundary area and the color layer areas on both sides according to the boundary position, avoiding color mixing and bleeding caused by inconsistent curing speed of the fabric at the boundary due to overall temperature control. The temperature monitoring component collects the temperature data of the boundary area in real time and feeds it back to the multi-parameter collaborative control module. If the temperature deviates from the preset range, the module can adjust the temperature parameters of the zone temperature control component in time to ensure that the curing speed of the fabric at the boundary area is appropriate, ultimately making the dual-color boundary clear and regular, while enhancing the adhesion strength of the color layer boundary and preventing peeling at the boundary during subsequent use.

[0058] In another embodiment, this embodiment provides a specific mold capable of performing two-color coloring on wood-plastic composite boards, namely, a two-color coloring mold for wood-plastic composite boards, comprising a first mold plate 1, a second mold plate 2, and a third mold plate 3 stacked and assembled together. A channel 4 for the wood-plastic composite board to pass through is formed in the middle of the first mold plate 1, the second mold plate 2, and the third mold plate 3. Two first flow channels 10 are provided on one side of the first mold plate 1 along the center of the channel 4 outside the channel 4. Feed channels 11 are provided on both sides of the first mold plate 1, and feed heads 12 are installed on the feed channels 11. The feed heads 12 are connected to... The material pipe 13, the feed channel 11 and the first flow channel 10 are connected, the second mold plate 2 has corresponding second flow channels 20 on both sides, and the first flow channel 10 and the second flow channel 20 are connected. The second flow channels 20 on the same side of the second mold plate 2 are independent of each other and are two different colors on the outside of the wood-plastic board. The third mold plate 3 has a third flow channel 30 on one side, and the third flow channel 30 is connected to the second flow channel 20. The first flow channel 10, the second flow channel 20 and the third flow channel 30 cooperate to make the two fabrics have two different colors on the outside of the wood-plastic board along their respective independent channels 4.

[0059] Two first flow channels 10 are symmetrically distributed along the center of channel 4. After the first mold plate 1, the second mold plate 2 and the third mold plate 3 are spliced, the first flow channel 10 and the second flow channel 20, and the second flow channel 20 and the third flow channel 30 are sealed and transferred. The two fabrics enter the feed channel 11 from one side of the mold respectively. For example, the two second flow channels 20 of the second mold plate 2 are independent of each other, each responsible for the fabric of one color. The fabric is evenly distributed to the surface of the wood-plastic board through the inner wall of channel 4. At the same time, the wood-plastic board is continuously pulled, and the two-color coloring of the wood-plastic board is carried out simultaneously, maintaining the same reference positioning for rapid two-color coloring.

[0060] The embodiments of this application have been described above. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A two-color coloring system for wood plastic board, characterized by, The wood-plastic board double-color coloring device comprises a coloring processing module, a fabric supply unit, a wood-plastic board conveying unit, a fabric flow adjusting unit, a multi-parameter collaborative control module and a double-color boundary precise temperature control and shaping module. The wood-plastic board conveying unit is used for conveying the wood-plastic board to the processing area of the coloring processing module along a preset path, so that the wood-plastic board passes through the middle position of the coloring processing module. The fabric supply unit is configured to provide different colors of fabric to the two sides of the coloring processing module. The coloring processing module is used for receiving different colors of fabric from the two sides thereof and applying the fabric to two parallel surfaces of the wood-plastic board respectively to form different color layers on the two parallel surfaces. The fabric flow adjusting unit is connected with the fabric supply unit and is used for adjusting the flow of fabric supplied by the fabric supply unit to the coloring processing module to adapt to the moving speed of the wood-plastic board and coloring requirements. The multi-parameter collaborative control module is electrically connected with the wood-plastic board conveying unit, the fabric supply unit, the coloring processing module and the fabric flow adjusting unit respectively, is used for receiving real-time data fed back by each unit, calculating target parameters and outputting control instructions to each unit to realize collaborative matching and dynamic adjustment of the conveying speed and fabric flow in the wood-plastic board double-color coloring process. The double-color boundary precise temperature control and shaping module is arranged at the outlet end of the coloring processing module and is used for performing targeted temperature control on the boundary area of the different color layers on the two parallel surfaces of the wood-plastic board, and the temperature environment of the boundary area is adjusted to control the solidification speed of the fabric. The fabric circulation unit is connected with the fabric supply unit and the coloring processing module in communication and is used for recycling the fabric not adsorbed on the surface of the wood-plastic board by the coloring processing module and conveying the fabric to the fabric supply unit to realize cyclic supply of the fabric. The coloring path positioning module cooperates with the wood-plastic board conveying unit and is used for positioning the spatial position of the wood-plastic board in the conveying process to ensure that, when the wood-plastic board passes through the middle position of the coloring processing module, the two parallel surfaces to be colored of the wood-plastic board maintain a preset relative positional relationship with the fabric action areas on the two sides of the coloring processing module.

2. The two-color coloring system of the wood-plastic board according to claim 1, characterized in that, The fabric supply unit comprises a first fabric supply subunit and a second fabric supply subunit. The first fabric supply subunit is connected with one side of the coloring processing module in communication and is used for continuously supplying the first color of fabric to one side of the coloring processing module. The second fabric supply subunit is connected with the other side of the coloring processing module in communication and is used for continuously supplying the second color of fabric to the other side of the coloring processing module, wherein the first color and the second color are different colors.

3. The bi-color painting system of the wood plastic board according to claim 1, characterized in that, The coloring processing module is provided with a fabric distribution structure which is used for guiding the fabric from the two sides thereof to the corresponding surface of the wood-plastic board to be colored respectively; the fabric distribution structure can adapt to the surface morphology of the wood-plastic board to form a uniform action area when the fabric contacts the surface of the wood-plastic board, so as to realize coloring processing of the corresponding surface of the wood-plastic board.

4. The bi-color painting system of the wood plastic board according to claim 1, wherein, The wood-plastic board conveying unit comprises a conveying driving assembly and a path guiding assembly. The conveying driving assembly is used for providing driving force to continuously move the wood-plastic board along a preset direction. The path guiding assembly is used for limiting the moving track of the wood-plastic board, ensuring that the wood-plastic board keeps a preset posture during the movement and passes through the middle position of the coloring processing module, and making the two parallel surfaces of the wood-plastic board correspond to the fabric action areas on both sides of the coloring processing module.

5. The bi-color painting system of the wood plastic board according to claim 1, wherein, The coloring processing module is provided with a fabric uniform distribution unit, which is used for uniformly processing the fabric entering the inside, so that the fabric forms a uniform fabric layer before contacting the surface of the wood-plastic board, and then the uniform fabric layer is applied to the corresponding surface to be colored of the wood-plastic board.

6. The bi-color painting system of the wood plastic board according to claim 1, wherein, The wood-plastic board conveying unit further comprises a moving speed regulating subunit, which is used for adjusting the moving speed of the wood-plastic board in the processing area of the coloring processing module according to the coloring process requirement, so that the movement of the wood-plastic board is adapted to the application process of the fabric.

7. A two-color coloring mold for a wood-plastic board using the two-color coloring system for a wood-plastic board according to any one of claims 1 to 6, characterized by, The double-color coloring mold for wood-plastic board comprises a first mold plate, a second mold plate and a third mold plate which are combined in a superimposed manner, and a channel is formed in the middle of the first mold plate, the second mold plate and the third mold plate to allow the wood-plastic board to pass through, wherein one side of the first mold plate is provided with two first flow channels along the center of the channel outside the channel, and feed channels are formed on both sides of the first mold plate, a feed head is installed on the feed channel, the feed head is connected with a feed pipe, the feed channel and the first flow channel are communicated, corresponding second flow channels are formed on both sides of the second mold plate, the first flow channel and the second flow channel are communicated, the second flow channels on the same side of the second mold plate are independent of each other and are used for applying two different colors on the outside of the wood-plastic board, a third flow channel is formed on one side of the third mold plate, the third flow channel and the second flow channel are communicated, and the first flow channel, the second flow channel and the third flow channel are matched to make two kinds of fabric pass through the independent channels and be applied on the two different colors on the outside of the wood-plastic board.

Images