Machine head structure of profile wrapping machine

Abstract

The utility model belongs to the field of sectional material coating machines, and relates to a machine head structure of a sectional material coating machine, which comprises a suspension bracket, an air expansion shaft, a film guide roller group and a gluing device, the automatic tension control system comprises a control box, the control box is fixedly arranged on the suspension bracket, and a PLC (Programmable Logic Controller) is arranged in the control box; the magnetic powder brake is arranged on the suspension support, the output end of the magnetic powder brake is connected with the inflatable shaft, and the PLC is electrically connected with the magnetic powder brake; the proximity switch is connected with the induction block, the induction block is fixedly arranged on one of the film guide rollers, the proximity switch is fixedly arranged at the position, corresponding to the induction block, of the suspension support, and the proximity switch is electrically connected with a PLC in the control box. According to the utility model, automatic control of tension is realized, time and labor are saved, the production efficiency is improved, and the coating quality is ensured; the deviation correction operation of the coiled film material is also realized, and the production precision is higher; the method is suitable for the industrial fields of building doors and windows, furniture manufacturing, automobile decoration and the like.

Description

Technical Field

[0001] This utility model belongs to the field of profile coating machines, specifically a head structure of a profile coating machine. Background Technology

[0002] A profile wrapping machine is a specialized piece of equipment used to wrap decorative films on the surface of wood, metal, or plastic profiles. It continuously unfolds a roll of decorative film, applies adhesive, and then presses it onto the profile substrate to form a surface layer that has both decorative and protective functions.

[0003] The head structure of a traditional profile coating machine is as follows: Figure 1 , 2 As shown, the structure includes a suspension bracket 1 and an air shaft 2, a guide roller assembly 3, and an adhesive applicator 4 mounted on the suspension bracket 1. When these structures work together, they follow the following process flow: First, the rolled film is loaded onto the air shaft 2. The guide roller assembly 3 guides the decorative film to unfold it. Then, the adhesive applicator 4 applies hot melt adhesive or reactive adhesive to the decorative film. After the adhesive-coated decorative film is positioned by the guide rollers, it is laminated with the profile substrate through a pressing mechanism, ultimately forming a finished product with the desired coating effect.

[0004] To maintain the stability of the tension of the rolled film, a brake disc 6 and a pneumatic brake 22 are usually installed at the end of the air shaft 2. The pneumatic braking system applies frictional resistance to the rolled film. When the roll diameter is large, a larger braking force is required to overcome the rotational inertia of the film roll; as the roll diameter gradually decreases, the braking force needs to be reduced accordingly to avoid tension overload.

[0005] However, the aforementioned method of changing braking force via a pneumatic braking system has the following drawbacks: First, the dynamic adjustment of braking force relies entirely on manual operation. Operators must continuously monitor the membrane tension visually. When excessive tension causes the membrane to stretch and deform, the pneumatic brake pressure must be manually reduced; conversely, when insufficient tension causes the membrane to slack, the brake pressure must be increased. Second, this manual adjustment method suffers from response lag, making it difficult to match the dynamic demands of changes in roll diameter in real time, which can easily lead to fluctuations in coating quality. Third, long-term manual operation not only significantly increases labor intensity but also carries the risk of material waste due to operational errors, severely restricting the improvement of equipment automation and production efficiency. Utility Model Content

[0006] The present invention aims to provide a head structure for a profile coating machine to solve the problems of the existing dynamic adjustment of braking force relying entirely on manual operation, resulting in response lag, poor coating quality, high labor intensity, and low production efficiency.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A profile coating machine head structure includes a suspension bracket and an air shaft, a guide roller assembly, and an adhesive applicator mounted on the suspension bracket. The guide roller assembly includes two parallel guide roller shafts, each with a guide roller mounted on it. The two guide rollers are staggered vertically to form a film guiding channel. The guide roller assembly also includes guide baffles positioned above the two guide rollers. It further includes an automatic tension control system, which includes:

[0009] The control box is fixed on the suspension bracket and contains a PLC controller.

[0010] The magnetic powder brake is mounted on the suspension bracket. The output end of the magnetic powder brake is connected to the air shaft. The PLC controller is electrically connected to the magnetic powder brake.

[0011] The proximity switch and the sensing block are fixed on one of the guide rollers. The proximity switch is fixed on the suspension bracket at the position corresponding to the sensing block. The proximity switch is electrically connected to the PLC controller in the control box.

[0012] As a limitation of this utility model: the control box is equipped with a manual / electric switching button electrically connected to the PLC controller, a tension display screen electrically connected to the magnetic powder brake, and an adjustment knob electrically connected to the PLC controller for manually adjusting the tension.

[0013] As another limitation of this utility model: it also includes a correction system, which includes a photoelectric switch and a linear drive element; a mounting rod is fixed on the suspension bracket, the photoelectric switch is set on the mounting rod at the position corresponding to the film material, and the photoelectric switch is electrically connected to the PLC controller; the linear drive element is fixed on the suspension bracket, the output end of the linear drive element is connected to an air shaft, the air shaft is slidably set on the suspension bracket, the working direction of the linear drive element is set along the axial direction of the air shaft, and the linear drive element is electrically connected to the PLC controller.

[0014] As a further limitation of this utility model: the linear drive element is a DC push rod.

[0015] As a further limitation of this utility model, the control box is also provided with a control button that is electrically connected to the PLC controller and is used to manually adjust the movement of the DC push rod.

[0016] As a further limitation of this utility model: a mounting bracket is provided between the photoelectric switch and the mounting rod, the mounting bracket and the mounting rod are detachably connected, and the direction of movement of the photoelectric switch is set along the axial direction of the mounting rod.

[0017] As a further limitation of this utility model: a sliding component is provided between the photoelectric switch and the mounting bracket, and the photoelectric switch moves linearly along the axial direction of the air expansion shaft.

[0018] As a further definition of this utility model: the sliding assembly includes a guide rod frame, a guide rod, a handle screw, and a moving block. The guide rod frame is fixedly connected to the mounting bracket. The handle screw extends axially along the air shaft and is threadedly connected to the guide rod frame. The guide rod is fixedly connected to the guide rod frame and is arranged parallel to the handle screw. The moving block is threaded onto the handle screw and movably connected to the guide rod. The moving block is fixedly connected to the photoelectric switch.

[0019] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:

[0020] (1) This utility model is an improvement on the existing profile coating machine head. The main improvement is the addition of an automatic tension control system, which includes a control box, a magnetic powder brake, a proximity switch, and a sensing block. In use, the sensing block generates periodic displacement as the guide roller rotates. The proximity switch detects the rotation frequency of the sensing block and calculates the real-time transmission length of the decorative film guided by the guide roller by combining the calibrated circumference of the guide roller. The proximity switch transmits a pulse signal representing the real-time transmission length to the PLC. After calculation by the internal calculation unit of the PLC, the PLC controller dynamically adjusts the excitation current output to the magnetic powder brake, thereby changing the braking torque applied by the magnetic powder brake to the air shaft, thus adjusting the friction and realizing the automatic adjustment of the tension of the air shaft. When the roll diameter gradually decreases, the tension also gradually decreases, meeting the dynamic requirements of real-time matching of roll diameter changes and ensuring coating quality.

[0021] (2) This utility model also includes a correction system, which includes a photoelectric switch and a linear drive element. During operation, the photoelectric switch collects the analog signal of the edge position of the decorative film in real time to detect the lateral offset of the decorative film and outputs a corresponding signal to the PLC. When the detected deviation exceeds the allowable tolerance range, the PLC will send a relevant signal to the DC push rod. At this time, the DC push rod will drive the air shaft to move to the left and right to complete the correction.

[0022] Furthermore, the photoelectric switch is detachably connected to the mounting rod via a mounting bracket, allowing for significant adjustment of its position on the mounting rod. The photoelectric switch is also slidably mounted on the mounting bracket via a sliding assembly, enabling fine-tuning of its position. During use, the position of the photoelectric switch can be adjusted significantly or finely according to the width of the rolled film, ensuring the accuracy of the photoelectric switch detection.

[0023] In summary, this invention achieves automated tension control, saving time and labor, improving production efficiency, and ensuring coating quality; it also enables the correction operation of rolled film materials, resulting in higher production precision; and it is applicable to industrial fields such as building doors and windows, furniture manufacturing, and automotive decoration. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a schematic diagram of the main structure of the head of an existing profile coating machine;

[0026] Figure 2 This is a schematic diagram of the right-side structure of the head of an existing profile coating machine;

[0027] Figure 3 This is a schematic diagram of the main structure of an embodiment of the present utility model;

[0028] Figure 4 This is a schematic diagram of the main structure of the mounting bracket, sliding assembly, and photoelectric switch in this embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the left-side structure of an embodiment of the present invention (the guide roller assembly and proximity switch are not shown).

[0030] Figure 6 for Figure 5 An enlarged schematic diagram of part A in the middle;

[0031] Figure 7 This is a schematic diagram of another left-side structure of an embodiment of the present utility model (mounting rod and photoelectric switch are not shown).

[0032] Figure 8 This is a top view of an embodiment of the present invention (the guide roller assembly, the first optical axis, and the handle screw are not shown).

[0033] Figure 9 This is a front view structural diagram of the unwinding process in an embodiment of this utility model.

[0034] In the diagram: 1-Suspension bracket, 2-Air shaft, 3-Guide roller assembly, 31-Guide roller shaft, 32-Guide roller, 33-Film material guide channel, 34-Guide baffle, 35-Guide frame, 4-Glue applicator, 5-Decorative film, 6-Brake disc, 7-Control box, 8-Magnetic powder brake, 9-Proximity switch, 10-L-shaped plate, 11-Tension display screen, 12-Photoelectric switch, 13-Mounting rod, 131-Groove, 14-DC push rod, 15-Connecting frame, 16-Slider, 17-Slide rail, 18-Mounting frame, 181-First optical axis, 182-Second optical axis, 183-Top screw, 19-Sliding assembly, 191-Guide rod frame, 192-Guide rod, 193-Handle screw, 194-Moving block, 195-Connecting plate, 20-Rolled film material, 21-Connecting rod, 22-Pneumatic brake. Detailed Implementation

[0035] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and do not constitute a limitation thereof.

[0036] The directional terms or positional relationships such as "left," "right," "front," and "back" used in the embodiments are based on the drawings in this utility model specification. Figure 3 , Figure 5 The orientation relationships are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model.

[0037] like Figures 3-9 As shown, this embodiment includes a suspension bracket 1, an air shaft 2, a film guide roller assembly 3, and an adhesive applicator 4 mounted on the suspension bracket 1. The film guide roller assembly 3 includes two parallel film guide roller shafts 31, each with a film guide roller 32 mounted on it. The two film guide rollers 32 are staggered vertically to form a film guiding channel 33. The film guide roller assembly 3 also includes a film guide frame 35 and a film guide baffle 34 fixedly connected to the film guide frame 35 and positioned above the two film guide rollers 32. This part is prior art and will not be described in detail in this embodiment.

[0038] The main improvement in this embodiment is the addition of an automatic tension control system and a correction system.

[0039] I. Automatic tension control system;

[0040] like Figure 3 As shown, the tension automatic control system includes a control box 7, a magnetic powder brake 8, a proximity switch 9, and a sensing block.

[0041] The control box 7 is fixed on the suspension bracket 1. The control box 7 is existing technology and contains a PLC controller. Figure 5 , 7 The control box is not shown in section 8. The magnetic powder brake 8 is mounted on the suspension bracket 1, and its output end is connected to the air shaft 2. The PLC controller is electrically connected to the magnetic powder brake 8. The sensing block is a metal block fixed to one of the guide rollers 32. In this embodiment, it is fixed to the end of the rear guide roller 32 and can rotate with it. The sensing block is not shown in the figure. A proximity switch 9 is fixed on the suspension bracket 1 at the position corresponding to the sensing block. Figure 3 , 7 As shown, in this embodiment, the proximity switch 9 is fixed on the guide film baffle 34 by the L-shaped plate 10, and the proximity switch 9 and the sensing block maintain a non-contact alignment relationship; the proximity switch 9 is electrically connected to the PLC controller in the control box 7. Figure 7 The middle guide film frame 35 and the guide film baffle 34 are not shown, and Figure 7 The proximity switch 9 is drawn with dashed lines to make its structure clear.

[0042] The working principle is as follows: the sensing block generates periodic displacement as the guide roller 32 rotates. The proximity switch 9 detects the rotation frequency of the sensing block and calculates the real-time transmission length of the decorative film 5 guided by the guide roller 32 by combining the calibrated circumference of the guide roller 32. The proximity switch 9 transmits a pulse signal representing the real-time transmission length to the PLC. After calculation by the internal calculation unit of the PLC, the PLC controller dynamically adjusts the excitation current output to the magnetic powder brake 8, thereby changing the braking torque applied by the magnetic powder brake 8 to the air shaft 2. For example, when the roll diameter is large, the rotational inertia of the film roll is large, requiring a larger braking force. As the roll diameter gradually decreases, the braking force needs to be reduced accordingly to avoid tension overload. In this embodiment, through the cooperation of the proximity switch 9, the PLC controller, and the magnetic powder brake 8, as the roll diameter gradually decreases, the PLC controller automatically controls the magnetic powder brake 8 to gradually reduce the braking force to avoid tension overload of the decorative film 5. Since the proximity switch 9, the PLC controller, and the magnetic powder brake 8 all adopt existing technology, their structure and working principle will not be described in detail.

[0043] To improve this embodiment, the control box 7 is equipped with a manual / electric switching button electrically connected to the PLC controller, allowing selection between automated tension control and manual control. The control box 7 also has an adjustment knob electrically connected to the PLC controller for easy manual tension adjustment. The control box 7 further includes a tension display screen 11 electrically connected to the magnetic powder brake 8 to display the real-time tension. The structure and wiring connections of the manual / electric switching button, tension display screen 11, and adjustment knob can be derived from existing control box 7 structures.

[0044] II. Correction System;

[0045] like Figure 3-6 As shown in Figure 8, the correction system includes a photoelectric switch 12 and a linear drive element. The photoelectric switch 12 is a conventional U-shaped photoelectric switch, and the linear drive element is a conventional DC push rod 14. Alternatively, any existing structure capable of providing linear drive force, such as an electric push rod, can be selected. The photoelectric switch 12 is electrically connected to the PLC controller, and the linear drive element is also electrically connected to the PLC controller. The DC push rod 14 is fixed to the suspension bracket 1. The output end of the DC push rod 14 is connected to the air shaft 2. The working direction of the DC push rod 14 is set along the axial direction (i.e., left and right) of the air shaft 2, allowing the air shaft 2 to slide on the suspension bracket 1. The air shaft 2 is slidably set as follows: Figure 5As shown, a connecting frame 15 is provided between the magnetic powder brake 8 and the air shaft 2. The air shaft 2 is rotatably connected to the connecting frame 15 via bearings. The magnetic powder brake 8 is fixedly connected to the connecting frame 15. A slider 16 is fixedly provided at the bottom end of the connecting frame 15. A slide rail 17 extending axially along the air shaft 2 is provided on the suspension bracket 1. The slider 16 is slidably sleeved on the slide rail 17. Figure 8 As shown, in this embodiment, a connecting rod 21 extending toward the DC push rod 14 is fixedly provided on the connecting frame 15, and the connecting rod 21 is fixedly connected to the output end of the DC push rod 14.

[0046] The working principle is as follows: the photoelectric switch 12 collects the analog signal of the edge position of the decorative film 5 in real time to detect the lateral offset of the decorative film 5, and outputs the corresponding signal to the PLC. When the detected deviation exceeds the allowable tolerance range, the PLC will send the relevant signal to the DC push rod 14. At this time, the DC push rod 14 will drive the air shaft 2 to move in the left and right directions to complete the correction.

[0047] To facilitate manual operation, the control box 7 is also equipped with a control button that is electrically connected to the PLC controller for manually adjusting the movement of the DC push rod 14. Its structure and wiring connection can also be learned from the existing control box 7 structure.

[0048] The specific installation method of photoelectric switch 12 is as follows: Figure 3-6 As shown, a mounting rod 13 is fixed on the suspension bracket 1. The mounting rod 13 is parallel to the air shaft 2, extending in the left and right directions. The photoelectric switch 12 is positioned on the mounting rod 13 corresponding to the membrane material. Specifically, as shown... Figure 4 , 6 As shown, a mounting bracket 18 is provided between the photoelectric switch 12 and the mounting rod 13. The mounting bracket 18 includes a first optical axis 181, a second optical axis 182, and a set screw 183. The first optical axis 181 is sleeved on the mounting rod 13 and can slide along the axial direction of the mounting rod 13. The first optical axis 181 is provided with a threaded hole and the set screw 183 is threadedly connected. The mounting rod 13 is provided with a groove 131 extending in the left and right directions. When the set screw 183 is tightened so that the set screw 183 extends into the groove 131 and presses against the mounting rod 13, the first optical axis 181 cannot move. Conversely, when the set screw 183 is loosened, the first optical axis 181 can slide left and right on the mounting rod 13. That is, the mounting bracket 18 and the mounting rod 13 are detachably connected by the set screw 183. The second optical axis 182 is fixedly connected to the first optical axis 181. The end of the second optical axis 182 away from the first optical axis 181 is connected to the photoelectric switch 12. When the first optical axis 181 moves, the photoelectric switch 12 will move along the axial direction of the mounting rod 13, so that the photoelectric switch 12 corresponds to different positions of the air shaft 2.

[0049] Furthermore, such as Figure 3 , 4As shown in Figure 8, a sliding assembly 19 is provided between the photoelectric switch 12 and the mounting bracket 18, which also allows the photoelectric switch 12 to move linearly along the axial direction of the air shaft 2. The sliding assembly 19 includes a guide rod frame 191, a guide rod 192, a handle screw 193, and a moving block 194. The guide rod frame 191 has a U-shaped structure with the U-shaped opening located close to the photoelectric switch 12. The guide rod frame 191 is fixedly connected to the second optical axis 182 in the mounting bracket 18. The handle screw 193 extends along the axial direction of the air shaft 2 and is threadedly connected to the guide rod frame 191. There are two guide rods 192, and the handle screw 193 is located between the two guide rods 192. The guide rod 192 is fixedly connected to the guide rod frame 191 and is arranged parallel to the handle screw 193. The moving block 194 is threaded onto the handle screw 193 and is movably connected to the guide rod 192. The moving block 194 is fixedly connected to the photoelectric switch 12 through a connecting plate 195. The principle is as follows: When the handle screw 193 is turned, the movable block 194, which is threadedly connected to it, tends to rotate with the handle screw 193. However, due to the limiting effect of the guide rod 192, the movable block 194 cannot rotate. Therefore, under the threaded engagement, the movable block 194 drives the photoelectric switch 12 to perform linear motion on the handle screw 193. It should be further noted that... Figure 3 , 4 The handle portion of handle screw 193 is not shown in Figure 8, and... Figure 8 Only one guide rod 192 is shown in the diagram for illustration.

[0050] In practical applications, the widths of the rolled film 20 to be covered may differ. When the widths of the two rolled film 20s mounted on the air shaft 2 differ significantly, the position of the photoelectric switch 12 is adjusted by a larger range using the set screw 183 and the first optical axis 181. When the widths of the two rolled film 20s differ only slightly and only fine-tuning is required, there is no need to adjust the set screw 183 or the first optical axis 181; only the handle screw 193 needs to be adjusted. A larger or fine-tuned adjustment of the position of the photoelectric switch 12 is selected to ensure that the photoelectric switch 12 can detect the decorative film 5.

[0051] When using this embodiment, as Figure 3 , 9As shown, the rolled film 20, mounted on the air shaft 2, is unwound, and the decorative film 5 sequentially passes through the first guide roller 32, the film guide channel 33, and the second guide roller 32. During unwinding, the proximity switch 9 detects the rotation frequency of the sensing block and transmits a pulse signal to the PLC. The PLC adjusts the excitation current output to the magnetic powder brake 8, thereby changing the braking torque applied to the air shaft 2 by the magnetic powder brake 8, reducing the braking force, and avoiding tension overload. In other words, as the roll diameter of the rolled film 20 gradually decreases, the tension value on the tension display screen 11 automatically decreases, achieving automated tension control. In addition, the photoelectric switch 12 collects the analog signal of the edge position of the decorative film 5 in real time to complete the correction and prevent positional deviation when the decorative film 5 is wrapped with the profile substrate. The position of the photoelectric switch 12 is also adjusted significantly by the set screw 183 and the first optical axis 181, or finely adjusted by the handle screw 193 to ensure the accuracy of the detection by the photoelectric switch 12.

[0052] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A head structure of a profile coating machine, comprising a suspension bracket and an air shaft, a guide roller assembly, and an adhesive applicator mounted on the suspension bracket; the guide roller assembly includes two parallel guide roller shafts, each of which is fitted with a guide roller, the two guide rollers being staggered vertically to form a film guiding channel; the guide roller assembly further includes a guide baffle disposed above the two guide rollers; characterized in that, It also includes an automatic tension control system, which includes: The control box is fixed on the suspension bracket and contains a PLC controller. The magnetic powder brake is mounted on the suspension bracket. The output end of the magnetic powder brake is connected to the air shaft. The PLC controller is electrically connected to the magnetic powder brake. The proximity switch and the sensing block are fixed on one of the guide rollers. The proximity switch is fixed on the suspension bracket at the position corresponding to the sensing block. The proximity switch is electrically connected to the PLC controller in the control box.

2. The head structure of a profile coating machine according to claim 1, characterized in that, The control box is equipped with a manual / electric switching button that is electrically connected to the PLC controller, a tension display screen that is electrically connected to the magnetic powder brake, and an adjustment knob that is electrically connected to the PLC controller for manually adjusting the tension.

3. The head structure of a profile coating machine according to claim 1 or 2, characterized in that, It also includes a correction system, which includes a photoelectric switch and a linear drive element; a mounting rod is fixed on the suspension bracket, the photoelectric switch is set on the mounting rod at the position corresponding to the film material, and the photoelectric switch is electrically connected to the PLC controller; the linear drive element is fixed on the suspension bracket, the output end of the linear drive element is connected to an air shaft, the air shaft is slidably set on the suspension bracket, the working direction of the linear drive element is set along the axial direction of the air shaft, and the linear drive element is electrically connected to the PLC controller.

4. The head structure of a profile coating machine according to claim 3, characterized in that, The linear drive element is a DC actuator.

5. The head structure of a profile coating machine according to claim 4, characterized in that, The control box is also equipped with control buttons that are electrically connected to the PLC controller and are used to manually adjust the movement of the DC actuator.

6. The head structure of a profile coating machine according to claim 4 or 5, characterized in that, A mounting bracket is provided between the photoelectric switch and the mounting rod. The mounting bracket and the mounting rod are detachably connected. The direction of movement of the photoelectric switch is set along the axial direction of the mounting rod.

7. The head structure of a profile coating machine according to claim 6, characterized in that, A sliding assembly is provided between the photoelectric switch and the mounting bracket, and the photoelectric switch moves linearly along the axial direction of the air expansion shaft.

8. The head structure of a profile coating machine according to claim 7, characterized in that, The sliding assembly includes a guide rod frame, a guide rod, a handle screw, and a moving block. The guide rod frame is fixedly connected to the mounting bracket. The handle screw extends axially along the air shaft and is threadedly connected to the guide rod frame. The guide rod is fixedly connected to the guide rod frame and is arranged parallel to the handle screw. The moving block is threaded onto the handle screw and movably connected to the guide rod. The moving block is fixedly connected to the photoelectric switch.

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