Device and method for preparing jute fiber board for automotive trim

Abstract

The invention relates to the field of automobile part machining, and discloses a device and method for preparing a jute fiber plate for automobile trim, the device comprises a machining table, a guide frame is fixedly connected to the surface of the machining table, a partition heating assembly is arranged on the surface of an upper connecting plate, and a rapid cooling and demolding assembly is arranged on the surface of the machining table; and the partition heating assembly is used for dynamically adjusting the temperature and heat preservation time of each area in real time according to the water content of the plate blank, and finally the global temperature difference of the plate is ensured. The moisture content of the plate blank is collected in real time through a near-infrared moisture content detector, and data is transmitted to a PLC control module; the PLC automatically adjusts the temperature of the edge heating layer, the transition heating layer and the center heating layer according to the water content, the power is corrected in real time through the temperature controller, and it is ensured that the global temperature difference is smaller than or equal to + / -1 DEG C. By means of the design, the regional temperature difference problem caused by traditional overall heating is solved, fluctuation of the water content can be dynamically adapted, and cracking, carbonization or layering of the plate is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts processing, in particular to a device and method for preparing a hemp fiber board for automobile interior decoration. Background Art

[0002] Hemp fiber board for automotive interior is a plant fiber-based composite board specially used for the manufacture of automotive interiors. It uses natural hemp fibers such as flax, hemp, and jute as the main reinforcement phase, and is matched with resin (such as polypropylene, epoxy resin, water-based polyurethane, etc.) as the matrix phase. It is prepared by hot pressing, compression molding and other processes. It can be widely used in automotive seat back / cushion core materials, door panel linings, instrument panel substrates, roof substrates, trunk partitions and other interior components.

[0003] The preparation device of hemp fiber board for automobile interior usually includes the following devices: fiber processing device, mixing device, baking device and hot pressing molding device.

[0004] Existing hot pressing forming devices have significant limitations when adapting to the characteristics of hemp fiber boards, such as moisture content sensitivity and uneven heating during hot pressing, which restricts product quality and production efficiency. First, the hot pressing temperature is unevenly controlled, the board quality stability is poor, the moisture content of the hemp fiber slab is easily affected by raw materials and the environment, and the heat conduction efficiency of different areas of the board (edge, center) is different. Traditional devices mostly use an overall heating method, which cannot dynamically adjust the temperature according to the moisture content of the slab, and it is difficult to differentiate the temperature for the edge and center areas; when the moisture content of the slab is too high, the overall heating can easily cause the edge to be too dry and the center to be unripe, resulting in cracking and stratification; when the moisture content is too low, it can easily cause fiber carbonization, affecting the strength and appearance of the board, resulting in a low product qualification rate. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems raised in the above-mentioned background technology, and then propose a device and method for preparing hemp fiber board materials for automotive interiors. The near-infrared moisture content detector of the present invention collects the moisture content of the slab in real time and transmits the data to the PLC control module; the PLC automatically adjusts the temperature of the three heating layers (edge, transition, and center) according to the moisture content, and corrects the power in real time through the temperature controller to ensure that the global temperature difference is ≤±1°C. This design not only solves the regional temperature difference problem caused by traditional overall heating, but also can dynamically adapt to moisture content fluctuations, avoid cracking, carbonization or delamination of the board, and significantly improve the product qualification rate and quality stability.

[0006] The technical solution adopted by the present invention to solve the technical problem is: The cam-shaped mold board of claim 1, wherein the cam-shaped mold board has a bottom surface and a bottom surface. The cam-shaped mold board has a bottom surface and a bottom surface. The cam-shaped mold board has a bottom surface and a bottom surface.

[0007] Preferably, a PLC control module is provided on the surface of the front end of the processing table, the zoned heating assembly includes a near-infrared moisture content detector, an edge heating layer is provided on the inner side wall of the upper connecting plate close to the outer side, a transition heating layer is provided in the middle of the upper connecting plate, and a central heating layer is provided at the center of the upper connecting plate. The surfaces of the edge heating layer, the transition heating layer and the central heating layer are all electrically connected to a temperature controller, the near-infrared moisture content detector is provided on both sides of the upper mold, the near-infrared moisture content detector is electrically connected to the PLC control module, and the PLC control module is electrically connected to the temperature controller.

[0008] Preferably, the rapid cooling demolding assembly includes contact rods, which are provided in two groups. The inner side walls of the four groups of guide frames are slidably connected to the demolding seats, and the side walls on both sides of the demolding seats are elastically connected to wedges through reset springs. The rear end of the wedge is fixedly connected to a traction rope, and the traction rope changes the traction direction through an auxiliary wheel. The upper surface of the demolding seat is fixedly connected to multiple groups of ejectors.

[0009] Preferably, the left side wall of the processing table is fixedly connected to a water circulation cooler, the upper surface of the water circulation cooler is fixedly connected to a water outlet pipe and an outlet pipe, a valve is provided on the surface of the outlet pipe, a gear is fixedly connected to the adjustment handle of the valve, the outer side wall of the contact rod on the left is fixedly connected to a rack, the gear is meshed with the rack, the water inlet pipe is fixedly connected to the return end of the water circulation cooler, the water outlet pipe is fixedly connected to the inlet end of the circulation pipe, the inner side wall of the lower mold is fixedly connected to the circulation pipe, and the end of the circulation pipe away from the outlet pipe is fixedly connected to the water inlet pipe.

[0010] Preferably, guide rods are fixedly connected to both sides of the upper surface of the connecting plate, and the guide rods pass through and are slidably connected to the inner wall of the top end of the fixing frame.

[0011] Preferably, the two groups of contact rods are fixedly connected to the side walls on both sides of the upper connecting plate, the end of the traction rope away from the wedge block is fixedly connected to the upper surface of the processing table, the auxiliary wheel is rotatably connected to the inner side wall of the demolding seat, and the traction rope passes through and is slidably connected to the inner side wall of the demolding seat.

[0012] Preferably, one end of the return spring is fixedly connected to the outer side wall of the wedge block, the other end of the return spring is fixedly connected to the inner side wall of the demolding seat, the wedge block is slidably connected to the inner side wall of the demolding seat, the outer wall of the contact rod is in contact with the outer wall of the wedge block, the surface of the lower mold is provided with multiple groups of through holes, and the outer side wall of the ejector pin is in contact with the inner wall of the through hole of the lower mold.

[0013] Preferably, a method for preparing a hemp fiber board for automobile interior decoration comprises the following steps: S1. Equipment initialization and slab loading: Debug the processing table, guide frame, fixed frame, electric telescopic rod, connecting plate, elastic telescopic rod, upper connecting plate, upper mold, lower mold, rapid cooling demoulding component, zoned heating component, and PLC control module to the initial working state, ensuring that the guide rod slides smoothly on the inner wall of the top of the fixed frame, the elastic telescopic rod is in a naturally extended state, the demoulding seat drives the wedge to return to the initial position via the reset spring, the ejector pin fits into the through hole opened on the surface of the lower mold, the water circulation cooler is filled with sufficient cooling medium, and the valve on the surface of the water outlet pipe is closed; then, place the hemp fiber slab to be hot-pressed on the upper surface of the lower mold, completing the loading operation; S2. Slab moisture content detection and temperature control parameter presetting: Start the near-infrared moisture detector in the zoned heating assembly. The near-infrared moisture detector detects the moisture content of the hemp fiber slab on the lower mold with a detection accuracy of ±0.5%. The detected moisture content data is converted into an electrical signal and transmitted to the PLC control module. The PLC control module sends a control signal to the temperature controller based on the received moisture content data and the preset plate hot pressing process standard. The temperature controller sets the initial heating temperature and holding time of the edge heating layer, transition heating layer and center heating layer on the inner side of the upper connecting plate respectively. If the slab moisture content is detected to be greater than 8%, the temperature of the edge heating layer, transition heating layer and center heating layer is increased by 2-3°C compared to the reference temperature, and the holding time is extended by 10-15 seconds. If the slab moisture content is detected to be less than the set value, the temperature of each heating layer is correspondingly reduced to avoid overheating of the fiber. S3. Lowering the hot pressing mechanism and preparing for hot pressing: The electric telescopic rod is activated through the PLC control module. The telescopic end of the electric telescopic rod drives the connecting plate to move downward along the guide direction of the guide rod. During the downward movement of the connecting plate, the elastic telescopic rods on both sides thereof extend downward synchronously, driving the upper connecting plate and the upper mold at the center of the bottom end of the upper connecting plate to descend synchronously. At the same time, the two sets of contact rods fixedly connected to the side walls of the upper connecting plate descend synchronously with the upper connecting plate. The rack fixedly connected to the outer side wall of the left contact rod also moves downward synchronously with the descent of the contact rod. The rack meshes with the gear, and the downward movement of the rack drives the gear to rotate, keeping the valve closed and temporarily preventing the cooling medium from entering the circulation pipe. S4, slab partition hot pressing forming: As the upper die continues to descend, the upper die gradually approaches the hemp fiber slab on the surface of the lower die until the upper die and the slab are completely fitted together; at this time, the elastic telescopic rod is squeezed, exerting an elastic supporting force on the upper connecting plate to ensure that the upper die and the lower die are stably fitted together; at the same time, the edge heating layer, transition heating layer and center heating layer are started, and each heating layer is heated according to the parameters set in S2 under the control of the temperature controller to perform partitioned hot pressing on the slab; during the hot pressing process, the temperature sensors on the surface of each heating layer monitor the temperature in real time and feed the temperature data back to the PLC control module. The PLC control module adjusts the power of each heating layer in real time through the temperature controller to ensure that the temperature difference of the entire plate is ≤±1°C, until the set holding time is reached and the slab is hot pressed; S5. Rapid cooling and demolding preparation: After the slab is hot-pressed, the PLC control module controls the telescopic end of the electric telescopic rod to drive the connecting plate to move upward. The connecting plate drives the upper connecting plate, the upper mold, and the contact rod to rise synchronously through the elastic telescopic rod. During the rising process of the contact rod, the rack on the left contact rod moves upward accordingly, and the rack drives the gear to rotate in the opposite direction. The gear rotation opens the valve. The water circulation cooler is started. The water circulation cooler transports the internal cooling medium through the water outlet pipe to the circulation pipe fixedly connected to the inner side wall of the lower mold. The cooling medium flows in the circulation pipe to cool the lower mold and the hot-pressed slab. The cooling medium then flows back to the water circulation cooler through the water inlet pipe, forming a cooling cycle and accelerating the cooling of the slab. S6. Automatic demoulding operation: during the rising process of the contact rod, the inner side of the contact rod contacts the plane of the bottom end of the wedge block, and the contact rod is U-shaped, driving the wedge block and the demoulding seat slidably connected to the wedge block to move upward along the inner side wall of the guide frame; multiple sets of ejectors fixedly connected to the upper surface of the demoulding seat rise synchronously with the demoulding seat, and the ejectors move upward along the through holes on the surface of the lower mold, ejecting the cooled molded sheet in the lower mold to achieve automatic demoulding; when the demoulding seat rises to a preset height, the auxiliary wheel connected to the rotation of the inner side wall of the demoulding seat guides the traction rope, one end of the traction rope is fixed to the upper surface of the processing table, and the other end is fixed to the rear end of the wedge block, which pulls the wedge block to overcome the elastic force of the reset spring and slide on the inner side wall of the demoulding seat, so that the wedge block is separated from the inner side of the contact rod; the demoulding seat moves downward along the inner side wall of the guide frame under the action of its own gravity to reset, and the ejectors are synchronously reset to the through holes of the lower mold, completing a demoulding cycle; S7. Finished product removal and equipment reset: After the demoulding seat is completely reset, the finished hemp fiber board for automotive interior is removed from the lower mold. The electric telescopic rod is controlled by the PLC control module to drive the connecting plate, upper connecting plate and upper mold to reset to the initial position, completing the entire preparation process and preparing the next batch of hemp fiber boards.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses a near-infrared moisture content detector to collect the moisture content of the slab in real time and transmits the data to the PLC control module; the PLC automatically adjusts the temperature of the edge, transition, and center heating layers according to the moisture content, and corrects the power in real time through the temperature controller to ensure that the global temperature difference is ≤±1°C. This design not only solves the regional temperature difference problem caused by traditional overall heating, but also can dynamically adapt to moisture content fluctuations, avoid cracking, carbonization or delamination of the plate, and significantly improve product qualification rate and quality stability.

[0015] 2. After the hot pressing is completed, the contact rod rises and drives the rack to reverse, opening the valve to allow the cooling medium of the water circulation cooler to quickly cool the lower mold and the plate through the circulation pipe. The cooling efficiency is much higher than natural cooling.

[0016] 3. The contact rod of the present invention drives the demoulding seat to rise through the wedge block, and the ejector pin evenly ejects the plate to avoid deformation caused by manual prying; after the demoulding is in place, the traction rope pulls the wedge block to reset, and the demoulding seat automatically falls back. Cooling and demoulding are synchronized, eliminating the waiting time between processes and shortening the production cycle. The uniform force applied to the ejector pin and the cooling and shaping work together to effectively protect the edges and corners of the plate and the structural integrity.

[0017] 4. The present invention automatically completes the moisture content detection and temperature control parameter matching without manual calculation; the electric telescopic rod and elastic telescopic rod ensure stable pressure during the hot pressing process, and the guide rod guarantees the lifting accuracy.

[0018] 5. The cooling and demoulding of the present invention are automatically triggered by mechanical linkage, without the need for human intervention. The fully automated design not only reduces the difficulty of operation and avoids human errors, but also reduces manpower input, adapts to the large-scale production needs of automotive interiors, and improves production efficiency and parameter controllability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall three-dimensional diagram of the present invention; Figure 2 It is a schematic bottom view of the whole present invention; Figure 3 This is a schematic diagram of the upper mold structure of the present invention when viewed from above; Figure 4 It is a schematic top view of the zoned heating assembly of the present invention; Figure 5 This is a schematic diagram of the gear and rack being separated according to the present invention; Figure 6 It is a schematic diagram of a partial cross-sectional structure of the demoulding seat of the present invention; Figure 7 It is a schematic diagram of the partial cross-sectional structure of the lower mold of the present invention.

[0020] in: 1. Processing table; 2. Fixed frame; 3. Electric telescopic rod; 4. Connecting plate; 5. Elastic telescopic rod; 6. Upper connecting plate; 7. Guide frame; 8. Lower mold; 9. Rapid cooling demoulding assembly; 901. Contact rod; 902. Rack; 903. Water circulation cooler; 904. Demolding base; 905. Pull rope; 906. Auxiliary wheel; 907. Wedge; 908. Return spring; 909. Water outlet pipe; 910. Water inlet pipe; 911. Valve; 912. Gear; 913. Ejector pin; 914. Circulation pipe; 10. PLC control module; 11. Zone heating assembly; 111. Near-infrared moisture content detector; 112. Temperature controller; 114. Edge heating layer; 115. Transition heating layer; 116. Center heating layer; 12. Guide rod; 13. Upper die. DETAILED DESCRIPTION

[0021] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0022] Example 1, as Figure 1-Figure 3As shown, the embodiment of the present invention provides a device for preparing a hemp fiber board for automobile interior decoration, including a processing table 1, a guide frame 7 is fixedly connected to the surface of the processing table 1, and the guide frame 7 is provided with four groups. The top ends of the inner side walls between the four groups of guide frames 7 are fixedly connected with a lower mold 8. The function of the four groups of guide frames 7 is to support the position of the lower mold 8. The rear end surface of the processing table 1 is fixedly connected with a fixed frame 2, and the top end of the fixed frame 2 is fixedly connected with an electric telescopic rod 3. The telescopic end of the electric telescopic rod 3 is fixedly connected with a connecting plate 4. When the electric telescopic rod 3 drives the connecting plate 4 to descend, it will drive the upper connecting plate 6 and the upper mold 13 at the bottom to descend synchronously to cooperate with the lower mold 8, thereby hot pressing the hemp fiber board blank. Elastic telescopic rods 5 are provided on both sides of the connecting plate 4, and the bottom ends of the elastic telescopic rods 5 are fixedly connected to the upper connecting plate 6. The function is to apply elastic support to the upper connecting plate 6 when it is lowered for hot pressing, so that it can stably fit the upper mold 13 and the lower mold 8 to perform hot pressing on the slab. The upper mold 13 is fixedly connected to the center of the bottom end of the upper connecting plate 6, and a partitioned heating component 11 is provided on the surface of the upper connecting plate 6. Guide rods 12 are fixedly connected on both sides of the upper surface of the connecting plate 4. The guide rods 12 pass through and are slidably connected to the inner wall of the top end of the fixed frame 2. The function of the guide rods 12 is to provide stable support and guidance for the up and down movement of the connecting plate 4. A rapid cooling demolding component 9 is provided on the surface of the processing table 1; the partitioned heating component 11 is used to dynamically adjust the temperature and insulation time of each area according to the moisture content of the slab in real time, and ultimately ensure the temperature difference of the entire plate; the rapid cooling demolding component 9 is used to automatically demold and accelerate the cooling of the slab after the processing is completed.

[0023] like Figure 1 、 Figure 3 and Figure 4 As shown, the surface of the front end of the processing table 1 is provided with a PLC control module 10, a near-infrared moisture content detector 111 is electrically connected to the PLC control module 10, and the PLC control module 10 is electrically connected to the temperature controller 112. The moisture content of the slab can be judged by the near-infrared moisture content detector 111 and the PLC control module 10, and the electrical signal is transmitted to the PLC control module 10. The partition heating component 11 includes a near-infrared moisture content detector 111, and the inner side wall of the upper connecting plate 6 is provided with an edge heating layer 114 near the outer side. The middle of the upper connecting plate 6 is electrically connected to the PLC control module 10. A transition heating layer 115 is provided at the center, and a central heating layer 116 is provided at the center of the upper connecting plate 6. Three groups of edge heating layers 114, transition heating layers 115 and central heating layers 116 are respectively provided, and the temperature of each group can be individually controlled by the temperature controller 112 on the surface, so that the temperature of different thicknesses can be adjusted in different areas during hot pressing of the slab. The surfaces of the edge heating layer 114, transition heating layer 115 and central heating layer 116 are all electrically connected to the temperature controller 112, and a near-infrared moisture content detector 111 is provided on both sides of the upper mold 13.

[0024] like Figure 1 、 Figure 5 and Figure 6 As shown, the rapid cooling demoulding assembly 9 includes contact rods 901, and two groups of contact rods 901 are fixedly connected to the side walls on both sides of the upper connecting plate 6, so that the upper connecting plate 6 drives the upper mold 13 to descend to cooperate with the lower mold 8 to contact the hemp fiber slab, which will drive the two groups of contact rods 901 to descend synchronously, and the end of the traction rope 905 away from the wedge block 907 is fixedly connected to the upper surface of the processing table 1. The length of the traction rope 905 is fixed, so that when the demoulding seat 904 moves up and down, it will be fixed to the surface of the processing table 1 through its bottom end, which will pull the wedge block 907 to move synchronously, auxiliary The auxiliary wheel 906 is rotatably connected to the inner side wall of the demoulding seat 904. The function of the auxiliary wheel 906 is to provide rotational guiding support for the movement of the traction rope 905. The traction rope 905 passes through and is slidably connected to the inner side wall of the demoulding seat 904. The inner side wall of the demoulding seat 904 is provided with an empty groove that fits the outer diameter of the traction rope 905, so that the traction rope 905 can move inside the demoulding seat 904. There are two groups of contact rods 901. The outer side wall of the left contact rod 901 is fixedly connected to the rack 902. When the contact rod 901 descends, it will drive the rack 902 to move up and down synchronously.

[0025] like Figure 6As shown, the inner side walls of the four groups of guide frames 7 are slidably connected to the demoulding seat 904, and the side walls on both sides of the demoulding seat 904 are elastically connected to the wedge block 907 through the return spring 908. One end of the return spring 908 is fixedly connected to the outer side wall of the wedge block 907, and the other end of the return spring 908 is fixedly connected to the inner side wall of the demoulding seat 904. The function of the return spring 908 is to automatically reset the position of the wedge block 907 after it is pulled and moved by the traction rope 905. The wedge block 907 is slidably connected to the inner side wall of the demoulding seat 904, and the upper surface of the wedge block 907 is fixedly connected to the inner side wall of the demoulding seat 904. The surface is provided with an arc surface, and the inner side of the demoulding seat 904 is provided with a sliding groove that fits the wedge block 907, so that the wedge block 907 can only move back and forth on the inner side wall of the demoulding seat 904, and the outer wall of the contact rod 901 contacts the outer wall of the wedge block 907. When the contact rod 901 descends, it will contact the arc surface of the upper surface of the wedge block 907, thereby squeezing the wedge block 907 to move on the inner wall of the demoulding seat 904. At this time, the upper mold 13 and the lower mold 8 cooperate to hot-press the hemp fiber slab until the contact rod 901 passes the wedge block 907. The wedge block 907 will Because the return spring 908 automatically resets, and the contact rod 901 is U-shaped, the inner side of the contact rod 901 will contact the plane at the bottom end of the wedge block 907 when following the rise of the upper connecting plate 6, thereby driving the demoulding seat 904 and the ejector pin 913 to rise synchronously, thereby demoulding the slab after the hot pressing of the inner side of the lower mold 8. After rising to a certain position, the wedge block 907 will be pulled by the traction rope 905 to separate from the inner side wall of the contact rod 901, so that the demoulding seat 904 as a whole returns to its original position, and the rear of the wedge block 907 The end is fixedly connected to a traction rope 905, and the surface of the traction rope 905 contacts the auxiliary wheel 906. The upper surface of the demoulding seat 904 is fixedly connected to multiple sets of ejector pins 913. The surface of the lower mold 8 is provided with multiple sets of through holes. The outer side wall of the ejector pin 913 contacts the inner wall of the through hole of the lower mold 8. The initial position of the ejector pin 913 fits with the inner through hole of the lower mold 8, so that the hemp limit plate can be stably hot-pressed. The ejector pin 913 moves up and down on the inner wall of the through hole of the lower mold 8, so that the hemp fiber interior decoration panel formed inside the lower mold 8 can be ejected and demoulded.

[0026] like Figure 5-Figure 7As shown, the left side wall of the processing table 1 is fixedly connected with a water circulation cooler 903. The water circulation cooler 903 is a prior art. The cooling medium is injected into the water circulation cooler 903 and started by the water circulation cooler 903, so that the cooling medium can circulate. The gear 912 is engaged with the rack 902. The engagement of the gear 912 with the rack 902 will cause the upper connecting plate 6 to drive the upper mold 13 to descend. When pressing the hemp fiber board, it will drive the rack 902 to descend synchronously, so that the valve 911 is closed, so that the cooling medium no longer flows from the water outlet pipe 909. After the pressing is completed, the reverse engagement rotation will cause the valve 911 to open, so that the cooling medium can circulate, thereby accelerating the hemp fiber board after the hot pressing is completed. Rapid cooling and molding, the water inlet pipe 910 is fixedly connected to the return end of the water circulation cooler 903, the water outlet pipe 909 is fixedly connected to the inlet end of the circulation pipe 914, the upper surface of the water circulation cooler 903 is fixedly connected with the water outlet pipe 909, the surface of the water outlet pipe 909 is provided with a valve 911, the adjustment handle of the valve 911 is fixedly connected with a gear 912, the inner side wall of the lower mold 8 is fixedly connected with the circulation pipe 914, and the end of the circulation pipe 914 away from the water outlet pipe 909 is fixedly connected with the water inlet pipe 910, and the cooling medium is transported from the water outlet pipe 909 to the circulation pipe 914 through the water circulation cooler 903, thereby performing circulation cooling, and discharged from the water inlet pipe 910 into the interior of the water circulation cooler 903, thereby performing cooling circulation.

[0027] Example 2, a method for preparing a hemp fiber board for automobile interior decoration, comprising the following steps: S1. Equipment initialization and slab loading: Debug the processing table 1, guide frame 7, fixed frame 2, electric telescopic rod 3, connecting plate 4, elastic telescopic rod 5, upper connecting plate 6, upper mold 13, lower mold 8, rapid cooling demoulding component 9, zoned heating component 11 and PLC control module 10 to the initial working state, ensure that the guide rod 12 slides smoothly on the inner wall of the top of the fixed frame 2, the elastic telescopic rod 5 is in a natural telescopic state, the demoulding seat 904 drives the wedge block 907 to return to the initial position through the return spring 908, the ejector pin 913 fits into the through hole opened on the surface of the lower mold 8, a sufficient amount of cooling medium is injected into the water circulation cooler 903, and the valve 911 on the surface of the outlet pipe 909 is in a closed state; then place the hemp fiber slab to be hot-pressed on the upper surface of the lower mold 8 to complete the loading operation; S2. Detection of slab moisture content and presetting of temperature control parameters: The near-infrared moisture content detector 111 in the zoned heating assembly 11 is started. The near-infrared moisture content detector 111 detects the moisture content of the hemp fiber slab on the lower mold 8 with a detection accuracy controlled at ±0.5%. The detected moisture content data is converted into an electrical signal and transmitted to the PLC control module 10. The PLC control module 10 sends a control signal to the temperature controller 112 based on the received moisture content data and the preset plate hot pressing process standard. The temperature controller 112 sets the initial heating temperature and holding time of the edge heating layer 114, the transition heating layer 115 and the center heating layer 116 on the inner side of the upper connecting plate 6 respectively. If the slab moisture content is detected to be greater than 8%, the temperature of the edge heating layer 114, the transition heating layer 115 and the center heating layer 116 is increased by 2-3°C compared to the reference temperature, and the holding time is extended by 10-15 seconds. If the slab moisture content is detected to be less than the set value, the temperature of each heating layer is correspondingly reduced to avoid overheating of the fiber. S3. Lowering of the hot pressing mechanism and preparation for hot pressing: The electric telescopic rod 3 is activated through the PLC control module 10. The telescopic end of the electric telescopic rod 3 drives the connecting plate 4 to move downward along the guide direction of the guide rod 12. During the downward movement of the connecting plate 4, the elastic telescopic rods 5 on both sides thereof extend downward synchronously, driving the upper connecting plate 6 and the upper mold 13 at the center of the bottom end of the upper connecting plate 6 to descend synchronously. At the same time, the two groups of contact rods 901 fixedly connected to the side walls of the upper connecting plate 6 descend synchronously with the upper connecting plate 6. The rack 902 fixedly connected to the outer side wall of the left contact rod 901 also moves downward synchronously with the descent of the contact rod 901. The rack 902 meshes with the gear 912. The downward movement of the rack 902 drives the gear 912 to rotate, so that the valve 911 remains closed, and the cooling medium temporarily does not enter the circulation pipe 914. S4, slab partition hot pressing forming: as the upper die 13 continues to descend, the upper die 13 gradually approaches the hemp fiber slab on the surface of the lower die 8 until the upper die 13 is completely fitted with the slab; at this time, the elastic telescopic rod 5 is squeezed, exerting an elastic supporting force on the upper connecting plate 6 to ensure that the upper die 13 and the lower die 8 are stably fitted; at the same time, the edge heating layer 114, the transition heating layer 115 and the center heating layer 116 are started, and each heating layer is heated according to the parameters set in S2 under the control of the temperature controller 112 to perform partitioned hot pressing on the slab; during the hot pressing process, the temperature sensors on the surface of each heating layer monitor the temperature in real time, and the temperature data is fed back to the PLC control module 10, which adjusts the power of each heating layer in real time through the temperature controller 112 to ensure that the temperature difference of the entire plate is ≤±1°C, until the set holding time is reached and the slab is hot pressed; S5. Rapid cooling and demoulding preparation: After the slab is hot-pressed, the PLC control module 10 controls the telescopic end of the electric telescopic rod 3 to drive the connecting plate 4 to move upward, and the connecting plate 4 drives the upper connecting plate 6, the upper mold 13 and the contact rod 901 to rise synchronously through the elastic telescopic rod 5; during the rising process of the contact rod 901, the rack 902 on the left contact rod 901 moves upward accordingly, and the rack 902 drives the gear 912 to rotate in the opposite direction, and the rotation of the gear 912 opens the valve 911; the water circulation cooler 903 is started, and the water circulation cooler 903 transports the internal cooling medium to the circulation pipe 914 fixedly connected to the inner side wall of the lower mold 8 through the outlet pipe 909. The cooling medium flows in the circulation pipe 914 to cool the lower mold 8 and the hot-pressed plate, and then the cooling medium flows back to the water circulation cooler 903 through the water inlet pipe 910, forming a cooling cycle to accelerate the cooling of the plate; S6, automatic demoulding operation: During the rising process of the contact rod 901, the inner side of the contact rod 901 contacts the flat surface at the bottom end of the wedge block 907, and the contact rod 901 is U-shaped, and drives the wedge block 907 and the demoulding seat 904 slidably connected to the wedge block 907 to move upward along the inner side wall of the guide frame 7; the multiple groups of ejector pins 913 fixedly connected to the upper surface of the demoulding seat 904 rise synchronously with the demoulding seat 904, and the ejector pins 913 move upward along the through holes on the surface of the lower mold 8, ejecting the cooled molded sheet in the lower mold 8, and realizing automatic demoulding; when the demoulding seat 904 When rising to a preset height, the auxiliary wheel 906 connected to the inner side wall of the demoulding seat 904 rotates to guide the traction rope 905. One end of the traction rope 905 is fixed to the upper surface of the processing table 1, and the other end is fixed to the rear end of the wedge block 907. The traction wedge block 907 overcomes the elastic force of the return spring 908 and slides on the inner side wall of the demoulding seat 904, so that the wedge block 907 is separated from the inner side of the contact rod 901; the demoulding seat 904 moves downward along the inner side wall of the guide frame 7 under the action of its own gravity and resets, and the ejector pin 913 is synchronously reset to the through hole of the lower mold 8, completing a demoulding cycle; S7. Finished product removal and equipment reset: After the demolding base 904 is completely reset, the finished hemp fiber board for automotive interior is removed from the lower mold 8. The PLC control module 10 controls the electric telescopic rod 3 to drive the connecting plate 4, the upper connecting plate 6, and the upper mold 13 to reset to the initial position, completing the entire preparation process and allowing the preparation of the next batch of hemp fiber boards to proceed.

[0028] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are intended only to describe the present invention and do not require that the present invention must be constructed or operated in a specific direction. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" in the present invention should be understood in a broad sense. For example, they can be connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0029] The above is a preferred operating mode of the present invention. The description of the specific operating mode is only for a better understanding of the concept of the present invention. For those skilled in the art, it is clear that several improvements or equivalent substitutions can be made according to the principles of the present invention, and these improvements or equivalent substitutions are also considered to fall within the scope of protection of the present invention.

Claims

1. A device for preparing hemp fiber board for automobile interior decoration, comprising a processing table (1), characterized in that: The surface of the processing table (1) is connected to a guide frame (7), and the guide frame (7) is provided with four groups. The top ends of the inner side walls between the four groups of guide frames (7) are connected to a lower mold (8). The rear end surface of the processing table (1) is connected to a fixed frame (2), and the top end of the fixed frame (2) is connected to an electric telescopic rod (3). The telescopic end of the electric telescopic rod (3) is connected to a connecting plate (4). Both sides of the connecting plate (4) are provided with elastic telescopic rods (5), and the bottom end of the elastic telescopic rod (5) is connected to an upper connecting plate (6). The center of the bottom end of the upper connecting plate (6) is connected to an upper mold (13). The surface of the upper connecting plate (6) is provided with a partition heating component (11). The surface of the processing table (1) is provided with a rapid cooling demoulding component (9); the partition heating component (11) is used to dynamically adjust the temperature and insulation time of each area according to the moisture content of the slab in real time, and ultimately ensure the temperature difference of the entire slab; the rapid cooling demoulding component (9) is used to automatically demould and accelerate the cooling of the slab after the slab processing is completed.

2. The device for preparing hemp fiber board for automobile interior decoration according to claim 1, characterized in that: A PLC control module (10) is provided on the surface of the front end of the processing table (1), the partition heating component (11) includes a near-infrared moisture content detector (111), an edge heating layer (114) is provided on the inner side wall of the upper connecting plate (6) near the outer side, a transition heating layer (115) is provided in the middle of the upper connecting plate (6), and a central heating layer (116) is provided at the center of the upper connecting plate (6), the surfaces of the edge heating layer (114), the transition heating layer (115) and the central heating layer (116) are all electrically connected to a temperature controller (112), the near-infrared moisture content detector (111) is provided on both sides of the upper mold (13), the near-infrared moisture content detector (111) is electrically connected to the PLC control module (10), and the PLC control module (10) is electrically connected to the temperature controller (112).

3. The device for preparing hemp fiber board for automobile interior decoration according to claim 2, characterized in that: The rapid cooling demoulding assembly (9) includes a contact rod (901), and the contact rod (901) is provided in two groups. The inner side walls of the four groups of guide frames (7) are slidably connected to a demoulding seat (904), and the side walls on both sides of the demoulding seat (904) are elastically connected to a wedge block (907) through a return spring (908). The rear end of the wedge block (907) is fixedly connected to a traction rope (905), and the traction rope (905) changes the traction direction through an auxiliary wheel (906). The upper surface of the demoulding seat (904) is fixedly connected to multiple groups of ejector pins (913).

4. The device for preparing hemp fiber board for automobile interior decoration according to claim 3, characterized in that: The left side wall of the processing table (1) is fixedly connected to a water circulation cooler (903), the upper surface of the water circulation cooler (903) is fixedly connected to a water outlet pipe (909) and a water inlet pipe (910), the surface of the water outlet pipe (909) is provided with a valve (911), the adjustment handle of the valve (911) is fixedly connected to a gear (912), the outer side wall of the left contact rod (901) is fixedly connected to a rack (902), the gear (912) is meshed with the rack (902), the water inlet pipe (910) is fixedly connected to the return end of the water circulation cooler (903), the water outlet pipe (909) is fixedly connected to the inlet end of the circulation pipe (914), the inner side wall of the lower mold (8) is fixedly connected to the circulation pipe (914), and the end of the circulation pipe (914) away from the water outlet pipe (909) is fixedly connected to the water inlet pipe (910).

5. The device for preparing hemp fiber board for automobile interior decoration according to claim 2, characterized in that: Guide rods (12) are fixedly connected to both sides of the upper surface of the connecting plate (4), and the guide rods (12) pass through and are slidably connected to the inner wall of the top end of the fixing frame (2).

6. The device for preparing hemp fiber board for automobile interior decoration according to claim 3, characterized in that: The two groups of contact rods (901) are fixedly connected to the side walls on both sides of the upper connecting plate (6), one end of the traction rope (905) away from the wedge block (907) is fixedly connected to the upper surface of the processing table (1), the auxiliary wheel (906) is rotatably connected to the inner side wall of the demoulding seat (904), and the traction rope (905) passes through and is slidably connected to the inner side wall of the demoulding seat (904).

7. The device for preparing hemp fiber board for automobile interior decoration according to claim 6, characterized in that: One end of the return spring (908) is fixedly connected to the outer side wall of the wedge block (907), and the other end of the return spring (908) is fixedly connected to the inner side wall of the demoulding seat (904). The wedge block (907) is slidably connected to the inner side wall of the demoulding seat (904). The outer wall of the contact rod (901) contacts the outer wall of the wedge block (907). The surface of the lower mold (8) is provided with multiple groups of through holes, and the outer side wall of the ejector pin (913) contacts the inner wall of the through hole of the lower mold (8).

8. A method for preparing a hemp fiber board for automobile interior, using the apparatus for preparing a hemp fiber board for automobile interior according to claim 5 or 7, characterized in that: The following steps are involved: S1. Equipment initialization and slab loading: debug the processing table (1), guide frame (7), fixed frame (2), electric telescopic rod (3), connecting plate (4), elastic telescopic rod (5), upper connecting plate (6), upper mold (13), lower mold (8), rapid cooling demoulding component (9), partition heating component (11) and PLC control module (10) to the initial working state, ensure that the guide rod (12) slides smoothly on the inner wall of the top of the fixed frame (2), the elastic telescopic rod (5) is in a natural telescopic state, the demoulding seat (904) drives the wedge block (907) to reset to the initial position through the reset spring (908), the ejector pin (913) fits into the through hole opened on the surface of the lower mold (8), a sufficient amount of cooling medium is injected into the water circulation cooler (903) and the valve (911) on the surface of the water outlet pipe (909) is in a closed state; then place the hemp fiber slab to be hot-pressed on the upper surface of the lower mold (8) to complete the loading operation; S2. Detection of slab moisture content and presetting of temperature control parameters: Start the near-infrared moisture content detector (111) in the zoned heating assembly (11). The near-infrared moisture content detector (111) detects the moisture content of the hemp fiber slab on the lower mold (8). The detection accuracy is controlled within ±0.5%, and the detected moisture content data is converted into an electrical signal and transmitted to the PLC control module (10). The PLC control module (10) sends a control signal to the temperature controller (112) based on the received moisture content data and the preset plate hot pressing process standard. The temperature controller (112) sets the initial heating temperature and the holding time of the edge heating layer (114), the transition heating layer (115) and the center heating layer (116) on the inner side of the upper connecting plate (6) respectively - if the slab moisture content is detected to be greater than 8%, the temperature of the edge heating layer (114), the transition heating layer (115) and the center heating layer (116) is increased by 2-3°C compared to the reference temperature, and the holding time is extended by 10-15 seconds; if the slab moisture content is detected to be less than the set value, the temperature of each heating layer is correspondingly reduced to avoid overheating of the fiber; S3, hot pressing mechanism descending and hot pressing preparation: the electric telescopic rod (3) is started by the PLC control module (10), and the telescopic end of the electric telescopic rod (3) drives the connecting plate (4) to move downward along the guide direction of the guide rod (12); during the downward movement of the connecting plate (4), the elastic telescopic rods (5) on both sides thereof are synchronously extended downward, and drive the upper connecting plate (6) and the upper mold (13) at the center of the bottom end of the upper connecting plate (6) to descend synchronously; at the same time, the two groups of contact rods (901) fixedly connected to the side walls on both sides of the upper connecting plate (6) are synchronously descended along with the upper connecting plate (6), and the rack (902) fixedly connected to the outer side wall of the left contact rod (901) is synchronously moved downward along with the descending of the contact rod (901), and the rack (902) is meshed with the gear (912). The downward movement of the rack (902) drives the gear (912) to rotate, so that the valve (911) remains closed, and the cooling medium temporarily does not enter the circulation pipe (914); S4, hot pressing of the slab in different zones: as the upper die (13) continues to descend, the upper die (13) gradually approaches the hemp fiber slab on the surface of the lower die (8) until the upper die (13) is completely fitted with the slab; at this time, the elastic telescopic rod (5) is squeezed, exerting an elastic supporting force on the upper connecting plate (6) to ensure that the upper die (13) and the lower die (8) are stably fitted; at the same time, the edge heating layer (114), the transition heating layer (115) and the center heating layer (116) are started, and each heating layer is heated according to the parameters set in S2 under the control of the temperature controller (112), and the slab is hot pressed in different zones; during the hot pressing process, the temperature sensors on the surface of each heating layer monitor the temperature in real time, and feed the temperature data back to the PLC control module (10), and the PLC control module (10) adjusts the power of each heating layer in real time through the temperature controller (112) to ensure that the temperature difference of the entire plate is ≤±1°C, until the set holding time is reached, and the slab is hot pressed; S5. Rapid cooling and demoulding preparation: After the blank is hot-pressed, the PLC control module (10) controls the telescopic end of the electric telescopic rod (3) to drive the connecting plate (4) to move upward, and the connecting plate (4) drives the upper connecting plate (6), the upper mold (13) and the contact rod (901) to rise synchronously through the elastic telescopic rod (5); during the rising process of the contact rod (901), the rack (902) on the left contact rod (901) moves upward accordingly, and the rack (902) drives the gear (912) to rotate in the opposite direction, and the gear (912) 12) Turn the valve (911) to open; start the water circulation cooler (903), and the water circulation cooler (903) transports the internal cooling medium through the outlet pipe (909) to the circulation pipe (914) fixedly connected to the inner side wall of the lower mold (8). The cooling medium flows in the circulation pipe (914) to cool the lower mold (8) and the plate after hot pressing. Then, the cooling medium flows back to the water circulation cooler (903) through the water inlet pipe (910), forming a cooling cycle to accelerate the cooling of the plate; S6, automatic demoulding operation: during the rising process of the contact rod (901), the inner side of the contact rod (901) contacts the plane of the bottom end of the wedge block (907), and the contact rod (901) is U-shaped, and drives the wedge block (907) and the demoulding seat (904) slidably connected to the wedge block (907) to move upward along the inner side wall of the guide frame (7); multiple groups of ejector pins (913) fixedly connected to the upper surface of the demoulding seat (904) rise synchronously with the demoulding seat (904), and the ejector pins (913) move upward along the through holes on the surface of the lower mold (8), ejecting the molded plate after cooling in the lower mold (8), thereby realizing automatic demoulding; when the demoulding seat (904) When the mold is raised to a preset height, the auxiliary wheel (906) connected to the inner side wall of the demoulding seat (904) rotates to guide the traction rope (905), one end of the traction rope (905) is fixed to the upper surface of the processing table (1), and the other end is fixed to the rear end of the wedge block (907). The traction wedge block (907) overcomes the elastic force of the reset spring (908) and slides on the inner side wall of the demoulding seat (904), so that the wedge block (907) is separated from the inner side of the contact rod (901); the demoulding seat (904) moves downward along the inner side wall of the guide frame (7) under the action of its own gravity and resets, and the ejector pin (913) is synchronously reset to the through hole of the lower mold (8), completing a demoulding cycle; S7, finished product removal and equipment reset: After the demoulding seat (904) is completely reset, the finished hemp fiber board for automobile interior decoration ejected from the lower mold (8) is removed; the electric telescopic rod (3) is controlled by the PLC control module (10) to drive the connecting plate (4), the upper connecting plate (6) and the upper mold (13) to reset to the initial position, completing the entire preparation process, and the preparation of the next batch of hemp fiber boards can be carried out.

Images