A plaster applicator

Abstract

This utility model relates to the technical field of plaster production equipment, and in particular to a plaster coating machine, which solves the problems of equipment vibration, positioning misalignment, and poor coating accuracy caused by frequent lifting and lowering of heavy-duty components in the prior art. A plaster coating machine includes a base and a coating machine. The coating machine is connected to the top of the base via a support frame. Guide rollers are installed on both sides of the base. Fabric is placed between the base and the coating machine's outlet. A top plate and a bottom plate are provided at the bottom of the fabric. The bottom plate is connected to the top of the base, and the top plate is positioned above the bottom plate. Its four bottom corners are connected to the bottom plate via elastic guide structures. A cylinder is fixedly connected to the center of the bottom plate, and a magnetic plate is connected to the bottom end of the cylinder. An electromagnet adapted to the magnetic plate is provided on the top of the bottom plate. This utility model uses electromagnetic repulsion to drive the lightweight top plate to support the fabric, avoiding the lifting and lowering of heavy-duty components, reducing vibration and misalignment, and improving coating repeatability and thickness consistency.

Description

Technical Field

[0001] This utility model relates to the technical field of plaster production equipment, and in particular to a plaster coating machine. Background Technology

[0002] The plaster coating machine is a key piece of equipment in the production of traditional Chinese medicine external preparations. It is mainly used to uniformly coat molten or semi-fluid plasters onto non-woven fabrics, cotton cloths, or other substrates. It is the core link in the automated plaster production line, realizing the "coating-cooling-forming-slitting" process. This equipment ensures accurate dosage, uniform coating, and a neat appearance for each plaster by precisely controlling the temperature, flow rate, coating thickness, and substrate tension. This directly affects the product's efficacy stability, user comfort, and market qualification rate. With the acceleration of the modernization of traditional Chinese medicine and the continuous growth in market demand for external patches, higher requirements are placed on the automation level, coating accuracy, and operational stability of plaster coating machines.

[0003] Utility model patent CN 214733213 U discloses a plaster coating machine. This device, by incorporating components such as a fabric roll, hydraulic telescopic rod, adjusting roller, outer shell, heating plate, feeding port, and dust collector mounted on a base, achieves functions including fabric tension adjustment, plaster heating and conveying, and dust adsorption. The height of the adjusting roller is adjusted by rotating the fastening screw to keep the fabric taut and reduce wrinkles; simultaneously, the dust collector adsorbs dust on the surface of the plaster, preventing it from affecting the medicinal properties.

[0004] However, the device has a design flaw in its coating actuator: it uses a hydraulic telescopic rod to directly drive the entire mixing tank and discharge pipe to reciprocate up and down to achieve contact coating between the ointment and the fabric. Because the mixing tank and the ointment inside have a large mass, frequent lifting and lowering movements cause uneven load on the hydraulic system, easily leading to equipment vibration, positioning misalignment, and structural loosening after long-term operation, severely affecting the repeatability and thickness consistency of the coating.

[0005] Therefore, in response to the problems of high load on lifting structures, unstable operation, and poor coating accuracy in existing technologies, there is an urgent need to develop a plaster coating machine. This equipment should avoid frequent lifting of heavy-duty components, optimize the movement of the coating actuator, improve the stability and control accuracy of the equipment, and simultaneously consider cleanliness and ease of operation. This will significantly improve the consistency of plaster coating quality and production efficiency, better meeting the comprehensive requirements of modern pharmaceutical production for automation, precision, and compliance. Utility Model Content

[0006] The purpose of this invention is to provide a plaster coating machine that solves the problem in the existing technology where a hydraulic telescopic rod is used to directly drive the entire mixing tank and discharge pipe to reciprocate up and down to achieve contact coating between the plaster and the cloth. Because the mixing tank and the plaster inside have a large mass, frequent lifting and lowering movements cause uneven load on the hydraulic system, easily leading to equipment vibration, positioning misalignment, and structural loosening after long-term operation, seriously affecting the repeatability and thickness consistency of the coating.

[0007] To achieve the above objectives, this utility model provides a plaster coating machine, including a base and a coating machine. The coating machine is connected to the top of the base through several support frames. Guide rollers are installed on both sides of the base. A cloth is provided between the base and the discharge port of the coating machine. A top plate and a bottom plate are provided at the bottom of the cloth.

[0008] The bottom plate is connected to the top of the base, and the top plate is set on top of the bottom plate. The four corners of the bottom of the top plate are connected to the top of the bottom plate through an elastic guide structure. A cylinder is fixedly connected to the center of the bottom of the top plate, and a magnet plate is connected to the bottom end of the cylinder. An electromagnet adapted to the magnet plate is connected to the top of the bottom plate.

[0009] The bottom plate is made of metal and is connected to the top of the base by several positioning screws.

[0010] The top plate is wider than the end of the fabric, and a flexible pad is connected to the top of the top plate.

[0011] The elastic guide structure includes a guide frame connected to the top of the bottom plate and a circular plate located at the center inside the guide frame. A circular rod with one end sliding through the top of the guide frame is fixedly connected to the top of the circular plate. The top end of the circular rod is connected to the bottom of the top plate. Elastic buffers are provided at both the inner top and inner bottom of the guide frame.

[0012] The flexible pad is made of rubber and has several anti-slip grooves on its top.

[0013] The guide frame has sliding grooves on both sides, and the elastic buffer includes a contact plate and several compression springs. A central groove is provided at the top center of the contact plate. Sliding rods that slide in the sliding grooves are fixedly connected to both sides of the contact plate. One end of the compression spring is connected to the side wall of the contact plate, and the other end is connected to the inner wall of the guide frame. The size of the central groove is larger than the diameter of the round rod.

[0014] This utility model discloses a plaster coating machine. By installing a movable top plate below the plaster, the relative position between the plaster and the outlet is actively adjusted, changing the movement from "moving upwards" to "moving downwards." This requires driving only lightweight components such as the top plate, cylinder, and magnetic plate, significantly reducing the overall mass of the moving parts and thus greatly minimizing inertial effects and energy consumption during the driving process. Furthermore, the magnetic repulsion between the electromagnet and the magnetic plate achieves non-contact driving, avoiding common problems in traditional hydraulic or mechanical transmissions such as wear, oil leakage, and response lag, thus improving action response speed and control sensitivity. Simultaneously, the magnetic drive, combined with an elastic guiding structure located at the four corners of the bottom of the top plate, forms a flexible support system, ensuring... The top plate ensures stability and alignment during lifting and allows for natural rebound from the elastic element upon resetting, avoiding impact vibrations caused by rigid impacts and further enhancing the smoothness of equipment operation. Furthermore, since the top plate only lifts up and contacts the fabric when coating is required, remaining detached the rest of the time, it reduces continuous friction with the fabric during operation, helping to protect the substrate surface quality and prevent stretching deformation or wrinkling. This is particularly suitable for softer or more elastic nonwoven materials. The electromagnetic control method also facilitates integration into automated control systems, allowing for the setting of different energizing sequences, magnetic strengths, and lifting heights according to different product specifications. This enables precise control of the coating area and flexible adjustment of process parameters, enhancing the equipment's adaptability and operability. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the coating machine and support frame according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the guide frame and contact plate according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the round rod and round plate according to an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the slide groove and center groove in an embodiment of the present invention.

[0021] In the diagram: 1. Coating machine; 2. Bottom plate; 3. Base; 4. Fabric; 5. Guide roller; 6. Top plate; 7. Support frame; 8. Guide frame; 9. Contact plate; 10. Electromagnet; 11. Cylinder; 12. Round rod; 13. Round plate; 14. Magnetic plate; 15. Slide groove; 16. Center groove; 17. Compression spring; 18. Slide rod. Detailed Implementation

[0022] 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.

[0023] Example 1

[0024] Please see Figure 1-5 As shown, a plaster coating machine of this embodiment includes a base 3 and a coating machine 1. The coating machine 1 is connected to the top of the base 3 through several support frames 7. Guide rollers 5 are installed on both sides of the base 3. A cloth 4 is provided between the base 3 and the discharge port of the coating machine 1. A top plate 6 and a bottom plate 2 are provided at the bottom of the cloth 4.

[0025] The bottom plate 2 is connected to the top of the base 3. The top plate 6 is set on the top of the bottom plate 2. The four corners of the bottom of the top plate 6 are connected to the top of the bottom plate 2 through an elastic guide structure. A cylinder 11 is fixedly connected to the center of the bottom of the top plate 6. A magnet plate 14 is connected to the bottom end of the cylinder 11. An electromagnet 10 that is compatible with the magnet plate 14 is connected to the top of the bottom plate 2.

[0026] Before the plaster coating machine starts working, the rolled fabric 4 is first installed on the guide roller 5 at one end of the base 3. The fabric 4 is then pulled out from the initial roll position manually or by an auxiliary traction device, and passes sequentially between the base 3 and the discharge port of the coating machine 1. Finally, the tension is adjusted and the path is guided by the guide roller 5 on the other side to ensure that the fabric 4 remains flat, wrinkle-free, and runs smoothly throughout the entire running path. When the fabric 4 is completed and ready for coating, the heating system inside the coating machine 1 is activated to heat the pre-added ointment raw material to a suitable fluidity and molten state. Then, it is stably extruded through the discharge port at a constant flow rate onto the fabric 4. On the surface, continuous coating of ointment is achieved. During this process, the top plate 6 located below the fabric 4 is connected to the bottom plate 2 through elastic guide structures set at its four bottom corners. This structure allows the top plate 6 to generate elastic displacement within a certain range in the vertical direction, thus providing dynamic adjustment capability. When it is necessary to apply support force to the fabric 4 in the coating area or to make it fit tightly against the outlet, the control system energizes the electromagnet 10 installed on the top of the bottom plate 2. The electromagnet 10 generates a magnetic field, which forms a repulsive magnetic force with the magnet plate 14 fixedly connected to the bottom end of the cylinder 11. Since the upper end of the cylinder 11 is fixed to the bottom of the top plate 6, At the center, the repulsive force is transmitted through the cylinder 11 to the top plate 6, driving it to overcome the pre-pressure of the elastic guide structure and move upward until the upper surface of the top plate 6 is in close contact with the bottom surface of the fabric 4. This lifts a portion of the fabric 4 upward, forming a stable contact surface with the area below the outlet of the coating machine 1, which is beneficial for uniform transfer of the ointment and reduces coating gaps. In this state, the fabric 4 receives ointment coating from above during continuous operation, while being supported by the top plate 6 below, preventing uneven coating thickness caused by sagging due to its own weight or tension fluctuations. When a section of coating operation is completed or the equipment needs to pause the coating operation, the control system cuts off the power. When the current is supplied to the magnet 10, the magnetic field disappears, and the repulsive force between the magnet plate 14 and the electromagnet 10 is released. At this time, the elastic guide structure gradually restores its original deformation state by relying on its stored elastic potential energy, driving the top plate 6 together with the cylinder 11 and the magnet plate 14 to reset downwards and detach from the bottom surface of the fabric 4, so that the fabric 4 returns to a free hanging state. The tension is maintained only by the guide rollers 5 on both sides, thereby realizing non-contact operation, reducing frictional resistance and unnecessary mechanical intervention. The whole process can be repeated. With the help of the automatic control system, it can start and stop on demand, accurately position the coating area, and dynamically adjust the support force to ensure that the coating operation is continuous and stable.

[0027] Example 2

[0028] Please see Figure 1-5As shown in this embodiment, a plaster coating machine has a bottom plate 2 made of metal. The bottom plate 2 is connected to the top of the base 3 by several positioning screws. Specifically, by making the bottom plate 2 of metal and connecting it to the top of the base 3 by several positioning screws, the metal bottom plate 2 has high structural strength and thermal stability during equipment operation. It can effectively resist the local heat generated when the electromagnet 10 is working and the deformation under long-term stress. At the same time, the multiple positioning screws firmly fix the bottom plate 2 to the base 3, ensuring that it remains in a constant position during equipment vibration or dynamic operation. This avoids the relative position shift between the electromagnet 10 and the magnet plate 14 due to loosening, thereby maintaining the stability of the magnetic force transmission path. This achieves the effect of improving the overall structural rigidity and installation reliability, and provides a stable reference platform for the precise lifting and lowering movement of the top plate 6.

[0029] The elastic guide structure includes a guide frame 8 connected to the top of the bottom plate 2 and a circular plate 13 located at the center of the guide frame 8. A circular rod 12 with one end sliding through the top of the guide frame 8 is fixedly connected to the top of the circular plate 13. The top end of the circular rod 12 is connected to the bottom of the top plate 6. Elastic buffers are provided at the inner top and inner bottom of the guide frame 8. Specifically, through the elastic guide structure including the guide frame 8, the circular plate 13, the circular rod 12, and the elastic buffers at the inner top and inner bottom of the guide frame 8, when the electromagnet 10 is energized to drive the top plate 6 to rise, the circular rod 12 slides along the axial direction of the guide frame 8, and the circular plate 13 moves synchronously inside the guide frame 8. The elastic buffers provide controllable elastic restoring force during compression or tension, limiting the movement range of the top plate 6 and absorbing minor impacts during movement. The guide frame 8 guides and limits the circular rod 12 and the circular plate 13, preventing the top plate 6 from deflecting or swaying during lifting and lowering, thus ensuring the linearity and stability of the vertical movement of the top plate 6 and extending the service life of the structure.

[0030] Both sides of the guide frame 8 are provided with sliding grooves 15. The elastic buffer includes a contact plate 9 and several compression springs 17. A central groove 16 is provided at the top center of the contact plate 9. Both sides of the contact plate 9 are fixedly connected with sliding rods 18 that slide in cooperation with the inside of the sliding grooves 15. One end of the compression spring 17 is connected to the side wall of the contact plate 9, and the other end is connected to the inner wall of the guide frame 8. The size of the central groove 16 is larger than the diameter of the round rod 12. Specifically, the guide frame 8 is provided with sliding grooves 15 on both sides, the contact plate 9 is provided with sliding rods 18 on both sides that slide in cooperation with the sliding grooves 15, and the compression springs 17 are fixedly connected to the inside of the sliding grooves 15. The 7-connecting contact plate 9 and the inner wall of the guide frame 8 are configured such that the size of the central groove 16 of the contact plate 9 is larger than the diameter of the round rod 12. During the lifting and lowering of the top plate 6, the slide rod 18 slides along the slide groove 15, driving the contact plate 9 to move synchronously. The compression spring 17 is compressed or rebounds to provide elastic support force. The central groove 16 allows the round rod 12 to float laterally within a certain range, avoiding jamming or additional stress between the round rod 12 and the guide structure due to assembly errors or slight eccentricity. This achieves the effect of introducing a fault tolerance mechanism, improving the smoothness of structural operation and anti-interference ability while ensuring the guiding accuracy.

[0031] Example 3

[0032] Please see Figure 1-5 As shown in this embodiment, a plaster coating machine has a top plate 6 with a width greater than the end of the fabric 4, and a flexible pad is connected to the top of the top plate 6. Specifically, by setting the top plate 6 to be wider than the end of the fabric 4 and having a flexible pad connected to the top, when the top plate 6 moves upward and contacts the bottom surface of the fabric 4, its wider size can ensure that the effective support area of ​​the fabric 4 covers the entire width of the coating area, preventing edge collapse or uneven force. At the same time, the flexible pad is attached to the upper surface of the top plate 6 and forms a buffer interface when in contact with the fabric 4, reducing substrate damage or surface indentation that may be caused by rigid contact. This achieves the effect of expanding the support area, protecting the surface integrity of the fabric 4, and improving the coating uniformity.

[0033] The flexible pad is made of rubber, and its top has several anti-slip grooves. Specifically, by using rubber to make the flexible pad and having several anti-slip grooves on its top, when the top plate 6 is lifted and comes into contact with the bottom surface of the running fabric 4, the rubber material has a good coefficient of friction and elastic deformation ability, which can closely adhere to the surface of the fabric 4 and prevent relative slippage. The anti-slip grooves on the surface further increase the roughness of the contact surface, improve the friction, and effectively suppress the local displacement or wrinkles of the fabric 4 caused by traction or ointment adhesion during the coating process. This achieves the effect of enhancing the positioning stability of the fabric 4 and avoiding coating misalignment or coating patterning.

[0034] Before the plaster coating machine starts working, the rolled fabric 4 is first installed on the guide roller 5 at one end of the base 3. The fabric 4 is then pulled out from the initial roll position manually or by an auxiliary traction device, and passes sequentially between the base 3 and the discharge port of the coating machine 1. Finally, the tension is adjusted and the path is guided by the guide roller 5 on the other side to ensure that the fabric 4 remains flat, wrinkle-free, and runs smoothly throughout the entire running path. When the fabric 4 is completed and ready for coating, the heating system inside the coating machine 1 is activated to heat the pre-added ointment raw material to a suitable fluidity and molten state. Then, it is stably extruded through the discharge port at a constant flow rate onto the fabric 4. On the surface, continuous coating of ointment is achieved. During this process, the top plate 6 located below the fabric 4 is connected to the bottom plate 2 through elastic guide structures set at its four bottom corners. This structure allows the top plate 6 to generate elastic displacement within a certain range in the vertical direction, thus providing dynamic adjustment capability. When it is necessary to apply support force to the fabric 4 in the coating area or to make it fit tightly against the outlet, the control system energizes the electromagnet 10 installed on the top of the bottom plate 2. The electromagnet 10 generates a magnetic field, which forms a repulsive magnetic force with the magnet plate 14 fixedly connected to the bottom end of the cylinder 11. Since the upper end of the cylinder 11 is fixed to the bottom of the top plate 6, At the center, the repulsive force is transmitted through the cylinder 11 to the top plate 6, driving it to overcome the pre-pressure of the elastic guide structure and move upward until the upper surface of the top plate 6 is in close contact with the bottom surface of the fabric 4. This lifts a portion of the fabric 4 upward, forming a stable contact surface with the area below the outlet of the coating machine 1, which is beneficial for uniform transfer of the ointment and reduces coating gaps. In this state, the fabric 4 receives ointment coating from above during continuous operation, while being supported by the top plate 6 below, preventing uneven coating thickness caused by sagging due to its own weight or tension fluctuations. When a section of coating operation is completed or the equipment needs to pause the coating operation, the control system cuts off the power. When the current is supplied to the magnet 10, the magnetic field disappears, and the repulsive force between the magnet plate 14 and the electromagnet 10 is released. At this time, the elastic guide structure gradually restores its original deformation state by relying on its stored elastic potential energy, which drives the top plate 6 together with the cylinder 11 and the magnet plate 14 to reset downwards and detach from the bottom surface of the fabric 4, so that the fabric 4 returns to a free hanging state. The tension is maintained only by the guide rollers 5 on both sides, thereby realizing non-contact operation, reducing frictional resistance and unnecessary mechanical intervention. The whole process can be repeated. With the help of the automatic control system, it can start and stop on demand, accurately position the coating area, and dynamically adjust the support force to ensure that the coating operation is continuous and stable.The bottom plate 2 is made of metal and connected to the top of the base 3 by several positioning screws. The metal bottom plate 2 has high structural strength and thermal stability, which can effectively resist the local heat generated by the electromagnet 10 during operation and the deformation under long-term stress. The multiple positioning screws firmly fix the bottom plate 2 to the base 3, ensuring that it remains in a constant position during equipment vibration or dynamic operation, and preventing the relative position between the electromagnet 10 and the magnet plate 14 from shifting due to loosening, thereby maintaining the stability of the magnetic force transmission path. The top plate 6 is wider than the end of the fabric 4, and its top is connected to a flexible pad. When the top plate 6 moves upward and contacts the bottom surface of the fabric 4, the wider size can ensure an effective support area for the fabric 4. Covering the entire width of the coating area to prevent edge collapse or uneven stress, the flexible pad adheres to the upper surface of the top plate 6, forming a buffer interface when in contact with the fabric 4, reducing substrate damage or surface indentation that may be caused by rigid contact; the elastic guide structure includes a guide frame 8 connected to the top of the bottom plate 2 and a circular plate 13 located at the center of the guide frame 8. A circular rod 12 with one end sliding through the top of the guide frame 8 is fixedly connected to the top of the circular plate 13. The top end of the circular rod 12 is connected to the bottom of the top plate 6. Elastic buffers are provided at both the inner top and inner bottom of the guide frame 8. When the electromagnet 10 is energized to drive the top plate 6 to rise, the circular rod 12 slides axially along the guide frame 8, and the circular plate 13 moves synchronously inside the guide frame 8. The elastic buffers are pressed against the surface. During contraction or stretching, a controllable elastic restoring force is provided, limiting the movement range of the top plate 6 and absorbing minor impacts during movement. The guide frame 8 guides and limits the round rod 12 and round plate 13, preventing the top plate 6 from deflecting or swaying during lifting. The flexible pad is made of rubber, and its top has several anti-slip grooves. When the top plate 6 is lifted and contacts the bottom surface of the running fabric 4, the rubber material has a good coefficient of friction and elastic deformation ability, which can closely fit the surface of the fabric 4 and prevent relative slippage. The anti-slip grooves on the surface further increase the roughness of the contact surface, improve friction, and effectively suppress local displacement or wrinkles of the fabric 4 caused by traction or ointment adhesion during coating. The two guide frames 8 Each side is provided with a sliding groove 15. The elastic buffer includes a contact plate 9 and several compression springs 17. A central groove 16 is provided at the top center of the contact plate 9. Sliding rods 18 that slide and engage with the inside of the sliding groove 15 are fixedly connected to both sides of the contact plate 9. One end of the compression spring 17 is connected to the side wall of the contact plate 9, and the other end is connected to the inner wall of the guide frame 8. The size of the central groove 16 is larger than the diameter of the round rod 12. During the lifting and lowering of the top plate 6, the sliding rod 18 slides along the sliding groove 15, causing the contact plate 9 to move synchronously. The compression springs 17 provide elastic support force when compressed or rebound. The central groove 16 allows the round rod 12 to float laterally within a certain range, avoiding jamming or additional stress between the round rod 12 and the guide structure due to assembly errors or slight eccentricity.

[0035] This technical solution uses base 3 as the basic support structure for the entire machine. The coating machine 1 is fixed to the top of base 3 by several support frames 7, forming a stable upper coating unit. Guide rollers 5 installed on both sides of base 3 guide the running path of the fabric 4 and adjust its tension. The fabric 4 is placed between base 3 and the outlet of coating machine 1 to achieve continuous coating operation. The bottom plate 2 is made of metal and connected to base 3 by several positioning screws. This not only enhances the overall rigidity and deformation resistance of the structure but also effectively conducts and disperses the heat generated by electromagnet 10 during operation, preventing excessive local temperature rise from affecting the performance of surrounding components. Simultaneously, the positioning screws ensure that the bottom plate 2 is firmly installed, preventing loosening due to vibration. Electromagnet 10 provides a stable mounting reference; top plate 6 is positioned above bottom plate 2, and its four bottom corners are connected to bottom plate 2 via elastic guide structures. These elastic guide structures consist of guide frame 8, circular plate 13, circular rod 12, and elastic buffer components. Guide frame 8 is fixed to bottom plate 2 and contains circular plate 13, which is connected to the bottom of top plate 6 via circular rod 12 for vertical sliding guidance. Elastic buffer components at the top and bottom of guide frame 8 further provide buffering and reset functions. Specifically, the elastic buffer components consist of contact plate 9 and compression spring 17. Contact plate 9 slides with slide groove 15 on guide frame 8 via sliding rods 18 on both sides to ensure smooth movement. Compression spring 17 is connected to… The contact plate 9 and the inner wall of the guide frame 8 provide elastic support. The central groove 16 at the top of the contact plate 9 is larger than the diameter of the round rod 12, allowing the round rod 12 to have slight lateral displacement during lifting and lowering, avoiding jamming and improving the fault tolerance and smooth operation of the guide system. The cylindrical column 11 fixedly connected at the bottom center of the top plate 6 is used to transmit magnetic drive. Its bottom end is connected to the magnet plate 14. The electromagnet 10 installed on the top of the bottom plate 2 is opposite to the magnet plate 14. When the electromagnet 10 is energized, it generates a repulsive magnetic field, which pushes the magnet plate 14 to drive the cylindrical column 11 to move upward, thereby driving the top plate 6 to rise as a whole. The width of the top plate 6 is greater than the width of the fabric 4, ensuring that the support surface covers the entire coating area. To prevent edge sagging, the flexible pad on top is made of rubber, which has good elasticity and friction properties. It can effectively buffer contact pressure and prevent the fabric 4 from sliding. The anti-slip grooves on the surface of the flexible pad further enhance the friction between it and the fabric 4, avoiding displacement or wrinkles during the coating process. The entire driving process abandons the traditional hydraulic system to drive the heavy-duty mixing tank to lift and lower. It only drives the lighter top plate 6 assembly through the non-contact magnetic repulsion between the electromagnet 10 and the magnetic plate 14. This greatly reduces the mass of moving parts, reduces inertial effects and energy consumption, and avoids equipment vibration, positioning deviation and structural loosening caused by heavy-duty lifting and lowering. It also improves coating repeatability and thickness consistency.The electromagnetic control system offers a fast response time. Combined with the stable support of the elastic guide structure and positioning screw, it enables precise control and smooth operation of the lifting motion of the top plate 6. Simultaneously, during the non-coating stage, the top plate 6 resets and detaches from the fabric 4, reducing continuous friction and protecting the integrity of the substrate.

[0036] 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 plaster coating machine, characterized in that, include: The base and the coating machine are connected to the top of the base through several support frames. Guide rollers are installed on both sides of the base. Fabric is placed between the base and the discharge port of the coating machine. A top plate and a bottom plate are provided at the bottom of the fabric. The bottom plate is connected to the top of the base, and the top plate is set on top of the bottom plate. The four corners of the bottom of the top plate are connected to the top of the bottom plate through an elastic guide structure. A cylinder is fixedly connected to the center of the bottom of the top plate, and a magnet plate is connected to the bottom end of the cylinder. An electromagnet adapted to the magnet plate is connected to the top of the bottom plate.

2. The plaster coating machine according to claim 1, characterized in that, The bottom plate is made of metal and is connected to the top of the base by several positioning screws.

3. The plaster coating machine according to claim 1, characterized in that, The width of the top plate is greater than the end of the fabric, and a flexible pad is connected to the top of the top plate.

4. A plaster coating machine according to claim 2, characterized in that, The elastic guide structure includes a guide frame connected to the top of the bottom plate and a circular plate disposed at the center inside the guide frame. A circular rod with one end sliding through the top of the guide frame is fixedly connected to the top of the circular plate. The top end of the circular rod is connected to the bottom of the top plate. Elastic buffers are provided at both the inner top and inner bottom of the guide frame.

5. A plaster coating machine according to claim 3, characterized in that, The flexible pad is made of rubber and has several anti-slip grooves on its top.

6. A plaster coating machine according to claim 4, characterized in that, The guide frame has sliding grooves on both sides. The elastic buffer includes a contact plate and several compression springs. A central groove is provided at the top center of the contact plate. Sliding rods that slide in the sliding grooves are fixedly connected to both sides of the contact plate. One end of the compression spring is connected to the side wall of the contact plate, and the other end is connected to the inner wall of the guide frame. The size of the central groove is larger than the diameter of the round rod.

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