Multi-component precise metering and high pressure reaction extrusion equipment for hot melt adhesive

Abstract

This invention relates to the field of chemical machinery and equipment technology, specifically to a multi-component precise metering and high-pressure reactive extrusion device for hot melt adhesives, comprising a support assembly, a feeding assembly, and an extrusion assembly. The support assembly provides basic support; the feeding assembly has multiple feeding boxes and a weighing structure for accurately weighing the raw materials entering the premixing box and premixing them through a stirring unit; the extrusion assembly includes an extrusion motor, an extrusion screw, and a temperature control module for high-pressure reactive extrusion of the premixed material and real-time temperature control. This application can effectively solve the problems of inaccurate metering of multi-component raw materials, uneven mixing, and unstable control of reaction conditions, thereby improving product quality consistency.

Description

Technical Field

[0001] This invention relates to the field of chemical machinery and equipment technology, and in particular to a multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesives. Background Technology

[0002] Hot melt adhesives, as an environmentally friendly adhesive, are widely used in various industrial fields such as packaging, bookbinding, automobile manufacturing, and hygiene products. The production process of hot melt adhesives typically involves mixing various raw materials with different properties in specific proportions and then reacting and extruding them under high temperature and high pressure to form a final product with excellent adhesive properties. Existing hot melt adhesive production equipment usually includes main components such as storage tanks, mixing vessels, and extruders. Raw materials are transported to the mixing container through pipelines, undergo preliminary mixing using mechanical stirring, and then enter the extruder for melt plasticization and extrusion molding. This type of equipment has developed a relatively mature process flow through long-term operation and can meet basic production needs.

[0003] However, in the existing technology, the metering accuracy control of multi-component raw materials is still insufficient, making it difficult to completely avoid the proportioning error caused by manual operation or simple mechanical control. Furthermore, the uniformity of the mixing process needs to be improved, and it is also difficult to achieve real-time and accurate dynamic adjustment of temperature fluctuations during the extrusion stage. These factors affect the consistency and stability of hot melt adhesive product performance to a certain extent. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-component precise metering and high-pressure reactive extrusion device for hot melt adhesives, which can solve the technical problems of inaccurate metering of multi-component raw materials, uneven mixing, and unstable control of reaction conditions.

[0005] This application provides a multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesives, including a support assembly, a feeding assembly, and an extrusion assembly. The support assembly includes a base and a support frame, with the support frame fixedly connected to the base and located on top of the base. The feeding assembly includes multiple feeding boxes, multiple control valves, a weighing structure, a premixing tank, and a stirring unit. The multiple feeding boxes are mounted on the support frame, the weighing structure is located on one side of the base, and the premixing tank is mounted on the weighing structure. The weighing structure is used to weigh the raw materials entering the premixing tank each time. The multiple feeding boxes are connected to the premixing tank through corresponding control valves, and the stirring unit is located inside the premixing tank. The extrusion assembly includes an extrusion motor, an extrusion shell, an extrusion screw, and a temperature control module. The extrusion shell is connected to the premixing tank, the extrusion screw is rotatably mounted inside the extrusion shell, the output end of the extrusion motor is connected to the extrusion screw, and the temperature control module is used to control the temperature inside the extrusion shell.

[0006] The weighing structure includes a support plate, multiple pressure sensors, and a computing unit. The support plate is fixed to the base, the multiple pressure sensors are mounted on the support plate, the premixing tank is mounted on the pressure sensors, and the computing unit is connected to the multiple pressure sensors.

[0007] The premixing box includes a box body, a guide plate, a three-way reversing valve, a cleaning structure, and a collection box. The guide plate is fixedly connected to the box body and slidably connected to the support frame. The three-way reversing valve is connected to the box body and to the collection box and the extrusion shell respectively. After the raw material proportioning is completed, the three-way reversing valve is connected to the extrusion shell to output the raw materials. Then the three-way reversing valve is connected to the collection box, and the box body is cleaned by the cleaning structure.

[0008] The cleaning structure includes a support ring, multiple liquid outlet pipes, a connecting pipe, a water pump, and a water tank. The support ring is fixed to the tank, the multiple liquid outlet pipes are fixed to the support ring, the connecting pipe is connected to the multiple liquid outlet pipes, the water pump is connected to the connecting pipe, and the water tank is connected to the water pump.

[0009] The cleaning structure also includes a dryer, which is used to dry the cabinet after cleaning.

[0010] The dryer includes a first heating unit, a second valve, and an air pump. The first heating unit is located on the outside of the chamber. The second valve is connected to a connecting pipe, and the air pump is connected to the second valve. A one-way valve is installed between the connecting pipe and the water pump to prevent the airflow brought in by the air pump from flowing back into the water pump.

[0011] The mixing unit includes a lifting device, a mixing motor, a mixing rod, and mixing blades. The lifting device is mounted on the housing, the mixing motor is fixed to the lifting device, the mixing rod is fixedly connected to the output end of the mixing motor, and the mixing blades are connected to the mixing rod.

[0012] The lifting device includes a lifting cylinder and a lifting plate. The lifting cylinder is fixed to the box body, the lifting plate is connected to the output end of the lifting cylinder, and the stirring motor is fixed to the lifting plate.

[0013] The stirring unit also includes a reset spring, which is located between the lifting cylinder and the lifting plate and is used to reset the stirring motor.

[0014] The temperature control module includes a second heating unit, a temperature sensor, and an adjustment unit. The second heating unit is located outside the extrusion shell, the temperature sensor is located on the extrusion shell and is used to obtain the temperature of the raw material inside the extrusion shell, and the adjustment unit is used to adjust the second heating unit based on the temperature of the raw material.

[0015] Beneficial effects:

[0016] This application provides a multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesives. This solution achieves full-process optimization of the production process by constructing a systematic architecture integrating support, feeding and metering, premixing, and high-pressure extrusion. Specifically, multiple feeding boxes with control valves ensure the orderly supply of different components. A weighing structure located on one side of the base weighs each raw material entering the premixing tank in real time, enabling accurate collection and feedback of raw material ratio data, thus eliminating metering errors at the source. Furthermore, the stirring unit within the premixing tank activates, promoting thorough homogenization of each component before extrusion, thereby improving the uniformity of the mixture. Subsequently, the material enters the high-pressure environment of the extrusion screw driven by the extrusion motor. A temperature control module monitors and dynamically adjusts the temperature inside the extrusion shell in real time, ensuring the reaction process remains in optimal thermodynamic conditions. Therefore, this solution effectively solves the product quality fluctuation problems caused by metering deviations, uneven mixing, and temperature control lag in traditional equipment, significantly improving the performance consistency and production reliability of hot melt adhesive products, and meeting the needs of continuous high-precision industrial production. Overall, the technical solution of this application is logically sound and highly coordinated in all aspects. Through the organic combination of precise metering and intelligent temperature control, a stable and efficient reactive extrusion system is constructed, which has significant engineering application value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This application provides a schematic diagram of the structure of a multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesives;

[0019] Figure 2 A schematic diagram of the left side of a multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesives provided in this application;

[0020] Figure 3 A schematic diagram of the right side of a multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesives provided in this application;

[0021] Figure 4 A cross-sectional view of a multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesives provided in this application;

[0022] Figure 5 A cross-sectional view along the connecting pipe of a multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesive provided in this application.

[0023] Figure Labels

[0024] 1-Base; 2-Support frame; 3-Feeding box; 4-Control valve; 5-Support plate; 6-Pressure sensor; 7-Calculation unit; 8-Box body; 9-Guide plate; 10-Three-way reversing valve; 11-Collection box; 12-Support ring; 13-Discharge pipe; 14-Connecting pipe; 15-Water pump; 16-Water tank; 17-First heating unit; 18-Second valve; 19-Air pump; 20-One-way valve; 21-Lifting cylinder; 22-Lifting plate; 23-Stirring motor; 24-Stirring rod; 25-Stirring blade; 26-Reset spring; 27-Extrusion motor; 28-Extrusion shell; 29-Extrusion screw; 30-Second heating unit; 31-Temperature sensor; 32-Adjustment unit. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0026] First embodiment:

[0027] In the traditional hot melt adhesive production process, the precise metering and uniform mixing of multi-component raw materials are crucial to determining the performance of the final product. Existing hot melt adhesive production equipment often suffers from insufficient metering accuracy when handling the proportions of various raw materials with different properties, leading to significant deviations in the proportions of each component and consequently affecting the product's bond strength and weather resistance. Simultaneously, traditional equipment is prone to uneven mixing during the mixing stage, resulting in incomplete reactions in localized areas and fluctuations in product quality. Furthermore, during the extrusion reaction stage, unstable temperature control or inability to effectively maintain the pressure environment can lead to poor plasticization or degradation of the material, making it difficult to meet the demands of continuous industrial production of high-quality hot melt adhesives.

[0028] To address the aforementioned issues, this application provides a multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesives, which aims to achieve high-precision automatic metering of raw materials, efficient premixing, and stable high-pressure reactive extrusion through integrated structural design.

[0029] Based on the above issues, please refer to Figures 1-5This application provides a multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesives, including a support assembly, a feeding assembly, and an extrusion assembly. The support assembly includes a base 1 and a support frame 2, with the support frame 2 fixedly connected to the base 1 and located on top of the base 1. The feeding assembly includes multiple feeding boxes 3, multiple control valves 4, a weighing structure, a premixing tank, and a stirring unit. The multiple feeding boxes 3 are mounted on the support frame 2, the weighing structure is mounted on one side of the base 1, and the premixing tank is mounted on the weighing structure. The weighing structure is used to weigh the raw materials entering the premixing tank each time. The multiple feeding boxes 3 are respectively connected to the premixing tank through corresponding control valves 4, and the stirring unit is located inside the premixing tank. The extrusion assembly includes an extrusion motor 27, an extrusion shell 28, an extrusion screw 29, and a temperature control module. The extrusion shell 28 is connected to the premixing tank, the extrusion screw 29 is rotatably mounted inside the extrusion shell 28, the output end of the extrusion motor 27 is connected to the extrusion screw 29, and the temperature control module is used to control the temperature inside the extrusion shell 28.

[0030] A weighing structure is located on one side of the base 1, and the premixing tank is placed directly on or fixed to this weighing structure. The function of the weighing structure is to weigh the raw materials entering the premixing tank in real time and feed the weight signal back to the control system to achieve high-precision proportioning control. In specific implementations, the weighing structure can be in the form of an electronic scale, a weighing sensor array, etc., and its accuracy level can be set according to the production process requirements, for example, it can be 0.1g accuracy or higher accuracy; this embodiment does not impose any special limitations on this. Through the cooperation of the weighing structure and control valve 4, when a certain raw material reaches a preset weight, the system automatically closes the corresponding control valve 4, stopping the feeding, thereby eliminating errors from manual weighing.

[0031] The premixing tank is a container for the initial mixing of raw materials, and it houses a stirring unit. The premixing tank can be cylindrical, square, or other irregularly shaped, and the material must be corrosion-resistant and heat-resistant. The stirring unit is located inside the premixing tank and is used to stir and mix the materials after the raw materials are added. The stirring unit can refer to any mechanical device capable of mixing fluids or powders, such as a paddle mixer or a spiral ribbon mixer. Its specific structural form can be selected according to the viscosity characteristics of the materials, and this application does not impose any special limitations on this. The stirring unit works in conjunction with the weighing structure and control valve 4, starting the stirring after precise feeding, so that the multi-component raw materials reach a uniform mixed state before entering the extrusion process, creating favorable conditions for the subsequent high-pressure reaction.

[0032] The working process and principle of this application are as follows: First, according to the formula requirements, the control system opens the control valve 4 of the corresponding feeding box 3, and the raw materials flow into the premix box placed on the weighing structure. The weighing structure monitors the weight in real time and commands the valve to close when the set value is reached, thus completing the precise addition of all components in sequence. Subsequently, the stirring unit in the premix box is started to fully stir and mix the materials in the box. After mixing, the materials are sent into the extrusion shell 28, and the extrusion motor 27 drives the extrusion screw 29 to rotate, pushing the materials forward in the extrusion shell 28. During this process, the temperature control module heats or cools the extrusion shell 28 to allow the materials to fully melt and react under high temperature and high pressure, and finally be extruded from the extruder head.

[0033] As a preferred embodiment, the specific implementation of this application is as follows: When producing a certain high-performance hot melt adhesive, the operator adds resin, tackifier, and wax components to three feeding boxes 3 respectively. After the system starts, the first control valve 4 opens, and the resin enters the premixing box. When the weighing structure shows a weight of 50kg, the valve automatically closes; then the second control valve 4 opens, and 20kg of tackifier is added; finally, 10kg of wax components are added. After the feeding is completed, the stirring unit runs at a speed of 60 rpm for 5 minutes to make the three components initially mixed evenly. Subsequently, the valve at the bottom of the premixing box opens, and the mixture falls into the extrusion shell 28. The extrusion motor 27 drives the extrusion screw 29 to rotate at a speed of 100 rpm. The temperature control module controls the temperature of the extrusion shell 28 between 160℃ and 180℃. The material forms a high-pressure molten state under the shearing and pushing of the screw, and after passing through the filter screen, it is extruded from the die head, cooled, and pelletized to obtain the finished product.

[0034] Through the above technical solution, this application achieves the following beneficial effects: Due to the use of a weighing structure located on one side of the base 1 and supporting the premixing tank, coupled with multiple independent control valves 4, high-precision automatic metering of multi-component raw materials is achieved, avoiding proportional errors caused by manual batching and ensuring the consistency of the product formula; Because a stirring unit is set in the premixing tank and premixed before entering the extrusion assembly, the mixing uniformity of the raw materials is significantly improved, reducing energy consumption and reaction time in the subsequent extrusion process; Because the extrusion assembly integrates a motor-driven screw and an intelligent temperature control module, it can complete the plasticization and reaction of materials under stable high temperature and high pressure conditions, effectively ensuring the physical properties and chemical stability of the hot melt adhesive product, and improving production efficiency and product qualification rate.

[0035] Furthermore, the weighing structure includes a support plate 5, multiple pressure sensors 6, and a calculation unit 7. The support plate 5 is fixed to the base 1, the multiple pressure sensors 6 are disposed on the support plate 5, the premixing tank is disposed on the pressure sensors 6, and the calculation unit 7 is connected to the multiple pressure sensors 6.

[0036] The calculation unit 7 is an electronic control module used to receive, process, and calculate weight data. The calculation unit 7 is electrically connected to multiple pressure sensors 6 to collect the electrical signals output by each pressure sensor 6. The calculation unit 7 may integrate signal amplification circuits, filtering circuits, and a microprocessor. Its operation can involve weighted averaging or digital filtering of signals from pressure sensors 6 at different locations to eliminate noise from local disturbances or mechanical vibrations, thereby comprehensively calculating the accurate total weight of the premix box and its contents. The specific implementation of the calculation unit 7 can be set according to actual conditions; for example, it can be an independent PLC controller, an embedded microcontroller system, or a dedicated data processing card in an industrial computer. This application embodiment does not impose any special limitations on this. The calculation unit 7 also feeds back the calculated weight data to the control system to control the opening and closing of the control valve in the feeding assembly, achieving accurate metering of the raw materials.

[0037] When raw materials flow into the premixing tank through control valve 4, the gravity of the premixing tank and its internal materials acts on support plate 5, which in turn transmits the force to multiple pressure sensors 6 distributed on support plate 5. Each pressure sensor 6 senses a pressure change, converts it into a corresponding electrical signal, and sends it to calculation unit 7. After receiving multiple signals, calculation unit 7 uses a built-in algorithm to synthesize and correct the signals, eliminating abnormal fluctuations, and finally outputs a stable weight value. This process achieves high-precision real-time monitoring during dynamic feeding, ensuring the accuracy of the multi-component raw material ratio.

[0038] This application employs a multi-point support structure with a support plate 5 and multiple pressure sensors 6, effectively dispersing the load on the premixing box and reducing measurement deviations caused by off-center loading or localized stress concentration. The introduction of a computing unit 7 for intelligent processing of multi-channel sensor signals filters out environmental vibration noise and corrects nonlinear errors, significantly improving the stability and response speed of weighing data. The overall structural layout is reasonable, making the weighing process more accurate and reliable, further ensuring the precision of the multi-component raw material ratio for hot melt adhesives and meeting the high-standard requirements of high-pressure reactive extrusion processes for raw material metering.

[0039] Furthermore, the premixing box includes a box body 8, a guide plate 9, a three-way reversing valve 10, a cleaning structure, and a collection box 11. The guide plate 9 is fixedly connected to the box body 8 and slidably connected to the support frame 2. The three-way reversing valve 10 is connected to the box body 8 and to the collection box 11 and the extrusion shell 28 respectively. After the raw material proportioning is completed, the three-way reversing valve 10 is connected to the extrusion shell 28 to output the raw material. Then, the three-way reversing valve 10 is connected to the collection box 11, and the box body 8 is cleaned by the cleaning structure.

[0040] After the multi-component raw materials are weighed and mixed in the chamber 8, the control system drives the three-way reversing valve 10 to connect the chamber 8 with the extrusion shell 28. The uniformly mixed hot melt adhesive raw material enters the extrusion assembly for subsequent processing under gravity or pressure. When the chamber 8 needs to be cleaned, the three-way reversing valve 10 switches its state, disconnecting from the extrusion shell 28 and connecting the chamber 8 with the collection tank 11. At this time, the cleaning structure is activated, injecting cleaning medium into the chamber 8. The cleaning medium washes the inner wall of the chamber 8 and dissolves or removes residual materials. The resulting waste liquid flows into the collection tank 11 through the three-way reversing valve 10 under gravity or pressure. During this process, the guide plate 9 slides along the support frame 2, which can assist in adjusting the angle or position of the chamber 8 to optimize the cleaning effect or facilitate maintenance.

[0041] This application achieves physical isolation between the normal discharge flow path and the sewage discharge flow path during cleaning through the switching action of the three-way reversing valve 10, effectively preventing cleaning waste liquid from mixing into the finished product or contaminating the extruder components. At the same time, the design of the sliding guide plate 9 makes the box 8 more accessible and flexible during cleaning and maintenance. Combined with the coordinated work of the cleaning structure and the collection box 11, it realizes automated online cleaning inside the premixing box, significantly reducing the frequency of manual disassembly and cleaning and downtime, and ensuring the long-term accuracy of multi-component metering and the stability of product quality.

[0042] Furthermore, the cleaning structure includes a support ring 12, multiple outlet pipes 13, a connecting pipe 14, a water pump 15, and a water tank 16. The support ring 12 is fixed inside the housing 8, the multiple outlet pipes 13 are fixed to the support ring 12, the connecting pipe 14 is connected to the multiple outlet pipes 13, the water pump 15 is connected to the connecting pipe 14, and the water tank 16 is connected to the water pump 15.

[0043] When the premixing tank needs cleaning, the water pump 15 is started, drawing cleaning fluid from the water tank 16 and pressurizing it. The pressurized cleaning fluid enters the connecting pipe 14 and is then distributed through the connecting pipe 14 to multiple outlet pipes 13 fixed on the support ring 12. Since the outlet pipes 13 are distributed along the support ring 12 and face different directions toward the inner wall of the tank 8, the cleaning fluid is sprayed onto the inner surface of the tank 8 simultaneously or sequentially from multiple angles. The high-speed flowing cleaning fluid impacts the residual hot melt adhesive adhering to the inner wall, corners, and near the stirring unit of the tank 8, softening, dissolving, and peeling it off from the wall surface, which is then discharged with the waste liquid or flows into the collection device. The entire process replaces manual scrubbing with mechanized multi-point spraying, utilizing the synergistic effect of the fluid's kinetic and chemical energy to achieve comprehensive cleaning of the inside of the tank 8.

[0044] As a preferred embodiment, the solution of this application is implemented as follows: During the hot melt adhesive production interval, after receiving the cleaning command, the control system first closes the feed valve to confirm that no new raw materials enter the premixing tank. Next, an appropriate amount of special cleaning solvent is injected into the water tank 16. The water pump 15 is started, and the working pressure is set to 0.5 MPa to 1.0 MPa (the specific value can be adjusted according to the adhesive hardness). The cleaning solution is transported through the connecting pipe 14 to the support ring 12 surrounding the inside of the tank 8, and sprayed out from eight outlet pipes 13 evenly distributed on the support ring 12. The nozzle angles of the outlet pipes 13 are adjusted to point towards the bottom dead corner, the middle of the side wall, and the top edge of the tank 8, forming a fully covered spray net. Spraying continues for 5 to 10 minutes, during which the low-speed rotation of the stirring unit (if the structure allows) can be used to assist cleaning. After cleaning, the waste liquid is discharged through the outlet at the bottom of the tank 8, completing one automatic cleaning cycle.

[0045] Furthermore, the cleaning structure also includes a dryer, which is used to dry the chamber 8 after cleaning.

[0046] The dryer includes a first heating unit 17, a second valve 18, and an air pump 19. The first heating unit 17 is located on the outside of the housing 8. The second valve 18 is connected to the connecting pipe 14. The air pump 19 is connected to the second valve 18. A one-way valve 20 is provided between the connecting pipe 14 and the water pump 15 to prevent the airflow brought in by the air pump 19 from flowing back into the water pump 15.

[0047] A one-way valve 20 is installed on the pipeline between the connecting pipe 14 and the water pump 15, specifically between the inlet of the air pump 19 and the outlet of the water pump 15. The function of the one-way valve 20 is to prevent backflow of air: when the air pump 19 generates high-pressure airflow, without the one-way valve 20, the high-pressure gas may flow backward into the water pump 15, causing the impeller of the water pump 15 to reverse, damaging the seals, or overloading the motor. By installing the one-way valve 20, the airflow can only flow from the connecting pipe 14 towards the housing 8, and cannot flow backward into the water pump 15, thus effectively isolating the air path and the liquid path, protecting the safety of the water pump 15, and ensuring the stability and reliability of the system when switching between cleaning and drying modes.

[0048] After the raw materials are proportioned and the cleaning structure is cleaned, the system enters the drying stage. At this time, the control system shuts down the water pump 15, stopping the delivery of the cleaning solution; then, the second valve 18 is opened, and the air pump 19 and the first heating unit 17 are started. The air pump 19 draws in ambient air and compresses it, and the air is heated into hot air as it flows through the first heating unit 17. The hot air enters the connecting pipe 14 through the opened second valve 18. Due to the presence of the one-way valve 20, the hot air does not flow back into the water pump 15, but instead flows entirely to the multiple liquid outlet pipes 13. The hot air is finally sprayed out from the liquid outlet pipes 13, blowing away the inner wall and bottom of the chamber 8, removing residual moisture or solvent, and achieving rapid drying of the chamber 8. After drying is completed, the air pump 19 and the first heating unit 17 are shut down, the second valve 18 is closed, and the equipment returns to standby or the next feeding state.

[0049] Furthermore, the stirring unit includes a lifting device, a stirring motor 23, a stirring rod 24, and a stirring blade 25. The lifting device is mounted on the housing 8, the stirring motor 23 is fixed to the lifting device, the stirring rod 24 is fixedly connected to the output end of the stirring motor 23, and the stirring blade 25 is connected to the stirring rod 24.

[0050] When premixing multi-component hot melt adhesive raw materials, the height of the stirring motor 23 is first adjusted by the lifting device so that the stirring blades 25 are immersed to the preset material depth. Then, the stirring motor 23 is started, and the motor output shaft drives the stirring rod 24 to rotate, which in turn drives the stirring blades 25 to shear and circulate the raw materials in the box 8. If the mixing strategy needs to be changed during the mixing process (such as switching from strong dispersion at the bottom to overall circulation), the lifting device can be activated again to adjust the height of the stirring components. After the mixing is completed, the lifting device lifts the stirring motor 23, stirring rod 24 and stirring blades 25 as a whole, so that they are removed from the material layer and close to the top of the box 8. At this time, the three-way reversing valve 10 switches to the cleaning mode. The cleaning structure can rinse the inside of the box 8, while the raised stirring blades 25 avoid blocking the cleaning fluid flow or accumulating dirt, making it easy to clean thoroughly.

[0051] Furthermore, the lifting device includes a lifting cylinder 21 and a lifting plate 22. The lifting cylinder 21 is fixed to the housing 8, the lifting plate 22 is connected to the output end of the lifting cylinder 21, and the stirring motor 23 is fixed to the lifting plate 22.

[0052] After the control system issues a command, compressed air enters the rodless or rod chamber of the lifting cylinder 21, pushing the piston to move. The piston rod then extends or retracts, directly driving the lifting plate 22 to move linearly up and down along the guide direction. Since the stirring motor 23 is rigidly fixed on the lifting plate 22, the stirring motor 23 moves synchronously with the lifting plate 22, thereby driving the stirring rod 24 and stirring blades 25 connected to its output end to change their axial position within the housing 8. This process utilizes the high-frequency response characteristics of pneumatic components, enabling rapid completion of the stirring, mixing, and lifting actions, meeting the stringent requirements for stirring timing and position during the precise metering and premixing of multi-component raw materials.

[0053] Furthermore, the stirring unit also includes a reset spring 26, which is disposed between the lifting cylinder 21 and the lifting plate 22, and is used to reset the stirring motor 23.

[0054] During normal operation of the equipment, the lifting device drives the stirring motor 23 to descend. At this time, the return spring 26 is compressed and in an energy storage state, which also buffers the descent speed and reduces mechanical impact. When the stirring operation is completed or the stirring unit needs to be lifted, the lifting cylinder 21 exhausts and retracts. At this time, the return spring 26 releases elastic potential energy to help push the lifting plate 22 to rise, reducing the load on the lifting cylinder 21. Especially in extreme working conditions where the lifting cylinder 21 suddenly stops supplying air or fails, the return spring 26, as a power source independent of the air source, can immediately play a reset role, forcibly lifting the lifting plate 22 and the stirring motor 23 back to the initial high position, ensuring that the equipment enters a safe standby state and preventing equipment damage or safety accidents caused by free fall due to gravity.

[0055] Furthermore, the temperature control module includes a second heating unit 30, a temperature sensor 31, and an adjustment unit 32. The second heating unit 30 is disposed outside the extrusion shell 28, the temperature sensor 31 is disposed on the extrusion shell 28 and is used to obtain the temperature of the raw material inside the extrusion shell 28, and the adjustment unit 32 is used to adjust the second heating unit 30 based on the temperature of the raw material.

[0056] The second heating unit 30 can refer to a heating device for providing heat energy to the extrusion shell 28. It is located on the outside of the extrusion shell 28, and can be, for example, an electric heating coil or electric heating belt wrapped around the outer wall of the extrusion shell 28, or a heating rod embedded in the wall of the extrusion shell 28, or a jacket structure through which a high-temperature medium is introduced. This application embodiment does not make any special limitation on this. The second heating unit 30 is in direct contact with the extrusion shell 28 or connected through a heat-conducting medium. Its function is to act as a heat source, transferring heat to the interior of the extrusion shell 28 through heat conduction to maintain or increase the temperature of the raw materials inside, ensuring that the hot melt adhesive raw materials are within the temperature range required for melting or reaction.

[0057] Temperature sensor 31 can refer to a sensing element used to detect the physical quantity of temperature and convert it into a transmittable signal. It is installed on the extrusion shell 28, and can be, for example, a thermocouple or resistance temperature detector inserted inside the extrusion shell 28, or a surface temperature sensor attached to the inner or outer wall of the extrusion shell 28. Temperature sensor 31 is in direct contact with the raw material inside the extrusion shell 28 or indirectly senses it through the shell. Its function is to collect the actual temperature data during the extrusion process in real time and transmit this data as a feedback signal to the adjustment unit 32, forming a temperature monitoring link.

[0058] The adjustment unit 32 can refer to a control component used to process temperature signals and output control commands. It establishes signal or electrical connections with the temperature sensor 31 and the second heating unit 30, respectively. The adjustment unit 32 receives the measured temperature value from the temperature sensor 31 and compares it with the preset target temperature value, generating a corresponding adjustment signal based on the deviation value. The function of the adjustment unit 32 is to act as a control center, dynamically adjusting the power output, on / off frequency, or working duration of the second heating unit 30 according to a control algorithm (such as PID algorithm, fuzzy control algorithm, etc., which are not specifically limited in this embodiment), thereby realizing closed-loop control of the temperature inside the extrusion shell 28.

[0059] During the extrusion assembly operation, temperature sensor 31 continuously monitors the temperature changes of the raw material inside the extrusion shell 28 and transmits the real-time temperature signal to adjustment unit 32. Adjustment unit 32 compares the received real-time temperature with the preset process temperature. If the measured temperature is lower than the preset value, adjustment unit 32 increases the heating power of the second heating unit 30 or extends the heating time; if the measured temperature is higher than the preset value, it decreases the heating power or suspends heating. Through this monitoring-comparison-adjustment cycle mechanism, the second heating unit 30, temperature sensor 31, and adjustment unit 32 work together to keep the temperature inside the extrusion shell 28 stable within the set range, avoiding uneven hot melt adhesive reaction or degradation of physical properties due to temperature fluctuations.

[0060] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A multi-component precision metering and high-pressure reactive extrusion device for hot melt adhesives, characterized in that, It includes a support assembly, a feeding assembly, and an extrusion assembly. The support assembly includes a base and a support frame, the support frame being fixedly connected to the base and located on top of the base. The feeding assembly includes multiple feeding boxes, multiple control valves, a weighing structure, a premixing tank, and a stirring unit. The multiple feeding boxes are mounted on the support frame, the weighing structure is mounted on one side of the base, and the premixing tank is mounted on the weighing structure. The weighing structure is used to weigh the raw materials entering the premixing tank each time. The multiple feeding boxes are connected to the premixing tank through corresponding control valves, and the stirring unit is located inside the premixing tank. The extrusion assembly includes an extrusion motor, an extrusion housing, an extrusion screw, and a temperature control module. The extrusion housing is connected to the premixing chamber, the extrusion screw is rotatably disposed inside the extrusion housing, the output end of the extrusion motor is connected to the extrusion screw, and the temperature control module is used to control the temperature inside the extrusion housing.

2. The multi-component precision metering and high-pressure reactive extrusion equipment for hot melt adhesives as described in claim 1, characterized in that, The weighing structure includes a support plate, multiple pressure sensors, and a calculation unit. The support plate is fixed to the base, the multiple pressure sensors are disposed on the support plate, the premixing tank is disposed on the pressure sensors, and the calculation unit is connected to the multiple pressure sensors.

3. The multi-component precision metering and high-pressure reactive extrusion equipment for hot melt adhesives as described in claim 2, characterized in that, The premixing box includes a box body, a guide plate, a three-way reversing valve, a cleaning structure, and a collection box. The guide plate is fixedly connected to the box body and slidably connected to the support frame. The three-way reversing valve is connected to the box body and to the collection box and the extrusion shell, respectively. After the raw material proportioning is completed, the three-way reversing valve is connected to the extrusion shell to output the raw material. Then, the three-way reversing valve is connected to the collection box, and the box body is cleaned by the cleaning structure.

4. The multi-component precision metering and high-pressure reactive extrusion equipment for hot melt adhesives as described in claim 3, characterized in that, The cleaning structure includes a support ring, multiple liquid outlet pipes, a connecting pipe, a water pump, and a water tank. The support ring is fixed to the tank body, the multiple liquid outlet pipes are fixed to the support ring, the connecting pipe is connected to the multiple liquid outlet pipes, the water pump is connected to the connecting pipe, and the water tank is connected to the water pump.

5. The multi-component precision metering and high-pressure reactive extrusion equipment for hot melt adhesives as described in claim 4, characterized in that, The cleaning structure also includes a dryer, which is used to dry the box after cleaning.

6. The multi-component precision metering and high-pressure reactive extrusion equipment for hot melt adhesives as described in claim 5, characterized in that, The dryer includes a first heating unit, a second valve, and an air pump. The first heating unit is located on the outside of the housing. The second valve is connected to the connecting pipe. The air pump is connected to the second valve. A one-way valve is provided between the connecting pipe and the water pump to prevent the airflow brought in by the air pump from flowing back into the water pump.

7. The multi-component precision metering and high-pressure reactive extrusion equipment for hot melt adhesives as described in claim 6, characterized in that, The stirring unit includes a lifting device, a stirring motor, a stirring rod, and stirring blades. The lifting device is mounted on the housing, the stirring motor is fixed to the lifting device, the stirring rod is fixedly connected to the output end of the stirring motor, and the stirring blades are connected to the stirring rod.

8. The multi-component precision metering and high-pressure reactive extrusion equipment for hot melt adhesives as described in claim 7, characterized in that, The lifting device includes a lifting cylinder and a lifting plate. The lifting cylinder is fixed to the housing, the lifting plate is connected to the output end of the lifting cylinder, and the stirring motor is fixed to the lifting plate.

9. The multi-component precision metering and high-pressure reactive extrusion equipment for hot melt adhesives as described in claim 8, characterized in that, The stirring unit also includes a reset spring, which is disposed between the lifting cylinder and the lifting plate to reset the stirring motor.

10. The multi-component precision metering and high-pressure reactive extrusion equipment for hot melt adhesives as described in claim 9, characterized in that, The temperature control module includes a second heating unit, a temperature sensor, and an adjustment unit. The second heating unit is disposed outside the extrusion shell, the temperature sensor is disposed on the extrusion shell and is used to obtain the temperature of the raw material inside the extrusion shell, and the adjustment unit is used to adjust the second heating unit based on the temperature of the raw material.

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