Shape and uniformity accurate control device for hot melt adhesive scraping application

Abstract

The invention relates to a shape and uniformity accurate control device for hot melt glue scraping application, which comprises two racks and a scraping gun fixed between the two racks, the bottom of the scraping gun is fixedly connected with a glue scraping plate, the inner cavity of the glue scraping plate is provided with a glue outlet lip communicated with the inner cavity of the scraping gun through a glue supply structure, and the glue outlet lip is connected with the glue supply structure. The surface of the scraping gun is fixedly connected with a pressure sensor, and the detection end of the pressure sensor extends to an inner cavity of a scraping gun runner. According to the shape and uniformity accurate control device for hot melt adhesive scraping application, accurate control over the shape of a scraping coating face is achieved, glue is only coated on an actually needed area, glue waste generated in the follow-up cutting procedure is avoided, the use efficiency of the glue is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hot melt adhesive scraping, and particularly to a device for precisely controlling the shape and uniformity of hot melt adhesive scraping applications. Background Art

[0002] In the prior art, traditional hot melt adhesive scraping devices use a scraping gun to scrape molten hot melt glue onto the surface of leather materials with a specified width. The leather materials are fed in the form of a coil. When passing through the traditional scraping gun, the surface will be scraped with glue of a standard width, and then discharged in the form of a coil. This traditional scraping method has obvious defects. The surface of the leather material will be covered with glue of a fixed width. However, in subsequent processes, the skin needs to be cut into irregular shapes according to product requirements for bonding, which results in the remaining surface of the cut skin also being attached with glue, thus causing unnecessary waste of glue and increasing production costs.

[0003] In the existing hot melt adhesive scraping application technology, it is difficult to precisely control the shape of the scraping surface, and the uniformity of the scraping thickness is greatly affected by factors such as the number of valve head switches, resulting in uneven product quality.

[0004] The present invention aims to solve the problem of glue waste caused by the above-mentioned traditional hot melt adhesive scraping device. Through innovative design and control methods, it realizes precise control of the shape of the scraping surface, so that the glue is only coated on the actually required area, avoiding glue waste in subsequent cutting processes, improving the utilization efficiency of the glue, and reducing production costs. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a device for precisely controlling the shape and uniformity of hot melt adhesive scraping applications, which solves the problems mentioned above.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A device for precisely controlling the shape and uniformity of hot melt adhesive scraping, comprising two frames and a scraping gun fixed between the two frames. A scraping plate is fixedly connected to the bottom of the scraping gun. An extrusion lip is arranged in the inner cavity of the scraping plate and is communicated with the inner cavity of the scraping gun through a glue supply structure. A pressure sensor with a detection end extending into the inner cavity of the flow channel of the scraping gun is fixedly connected to the surface of the scraping gun. The glue pressure inside the flow channel is detected by the pressure sensor. An adjustment structure for opening and closing the glue supply structure is arranged on one side of the scraping gun. There are multiple adjustment structures and glue supply structures, which are respectively arranged in one-to-one correspondence on the scraping gun. The glue supply to multiple extrusion lips is adjusted through the corresponding adjustment structure and glue supply structure, thereby determining whether to perform scraping operation. Through the on-off combination control of different extrusion lips, the effective control of the shape of the scraping surface can be precisely achieved. The left side of the scraping gun is communicated with a glue machine through a feed pipe for transporting glue. The right side of the scraping gun is communicated with a return glue pipe through a return valve and a pneumatic proportional valve. The return of glue is controlled by the return valve. The pneumatic proportional valve receives the voltage signal from the pressure sensor and then controls the return pressure of the return valve for the pressure relief of the flow channel and the return of glue to the glue machine. A pressure sensor is arranged inside, and its function is to detect the glue pressure inside in real time; a standard pressure value is preset on the controller; When the number of open switching valves increases, the glue pressure inside will correspondingly decrease. At this time, the pressure sensor detects the decrease in glue pressure and sends the input signal to the controller. After receiving the signal, the controller promptly outputs a control signal to increase the rotation speed of the gear pump. As the rotation speed of the gear pump increases, the amount of glue entering the scraping gun increases, and the internal pressure gradually increases until the pressure increases to reach the preset standard value; When the number of open switching valves decreases, the glue pressure inside will increase. The pressure sensor feeds back the input signal of the increased glue pressure to the controller. The controller quickly responds and outputs a signal to control the reduction of the rotation speed of the gear pump to reduce the internal pressure. At the same time, the controller outputs a signal to the return valve to make the excess glue return to the melting machine through the return glue pipe. Through this series of operations, the internal pressure gradually decreases until it reaches the standard set value; Through the above cyclic control process of glue pressure, it can ensure that the internal glue pressure always remains stable. Regardless of how the number of open and closed switching valves changes, it can ensure that the glue is evenly distributed on the scraping surface, thereby effectively improving the scraping quality.

[0007] As a further solution of the present invention: A heating cable communicated with an external power supply penetrates through the inner cavity of the scraping gun to provide flow channel heating to prevent the glue from solidifying.

[0008] As a further solution of the present invention: The glue supply structure includes a communication pipeline arranged in the inner cavity of the scraping gun. One end of the communication pipeline penetrates and extends into the inner cavity of the scraping gun. An outlet is provided in the inner cavity of the scraping gun above the glue outlet lip. The bottom end of the communication pipeline is communicated with the outlet. The glue in the flow channel of the scraping gun is transported to the outlet through the communication pipeline, then dispersed through the outlet and overflows through the glue outlet lip. Since the width of the glue outlet lip becomes narrower, the glue will overflow under impact and evenly cover the glue outlet lip to ensure sufficient glue scraping.

[0009] As a further solution of the present invention: The adjusting mechanism includes an air storage tank fixed between two frames and a switching valve fixed on the surface of the scraping gun and communicated with the air storage tank. The movable section of the switching valve is fixedly connected with a top head extending into the inner cavity of the scraping gun. When the top head extends out, it abuts against the top end of the communication pipeline. The air storage tank supplies air to the switching valve to control the movement of the top head of the switching valve, squeeze the communication pipeline, and open and close the glue outlet lip.

[0010] As a further solution of the present invention: The glue inlet pipe is communicated with the glue machine through a gear pump, and the controller controls the rotation speed of the gear pump to adjust the glue supply amount.

[0011] As a further solution of the present invention: An extrusion airbag is fixedly connected in the inner cavity of the scraping gun below the top head. An inner embedding groove is provided in the inner cavity of the scraping plate. An expansion airbag communicated with the extrusion airbag through a balance pipeline is fixedly connected in the inner cavity of the inner embedding groove. A push plate is slidably connected in the inner cavity of the inner embedding groove. One side of the expansion airbag is fixedly connected with the push plate. A return spring is fixedly connected in the inner cavity of the inner embedding groove. One end of the return spring is fixedly connected with one side of the push plate. One side of the push plate is fixedly connected with a top rod. One end of the top rod penetrates and extends into the inner cavity of the scraping plate. A through groove slidably connected with the top rod is provided in the inner cavity of the scraping plate. The through groove is communicated with the glue outlet lip.

[0012] As a further solution of the present invention: A sealing plate that is fixedly connected to the end of the ejector rod and slides and seals inside the through groove is provided. The left and right movement of the ejector rod drives the left and right movement of the sealing plate to achieve the extrusion and sealing of the glue outlet lip. When normal glue is discharged during use, the glue enters the glue outlet lip. At this time, the through groove is blocked by the sealing plate and normal glue discharge is carried out. When the device obtains the relevant information of the product to be processed, the controller generates a corresponding control signal based on this product information and sends it to the corresponding switching valve. After receiving the signal, the switching valve controls the opening and closing state of the glue outlet, thereby determining whether to perform the scraping operation. Through the combined control of the opening and closing of different glue outlets, the effective control of the shape of the scraping surface can be accurately achieved. Each glue outlet is connected to the switching valve, and the opening and closing actions of the glue outlet are realized through the valve group signal. When the corresponding glue outlet lip is closed, the switching valve is supplied with gas by the air storage tank to control the movement of the valve head, squeeze the communication pipeline to open and close the glue outlet lip. At this time, the valve head moves downward synchronously to squeeze the extrusion airbag, and the gas inside the extrusion airbag enters the expansion airbag through the balance pipeline. The expansion airbag pushes the push plate to slide inside the embedded groove, drives the ejector rod to move inside the through groove, drives the sealing plate to move to squeeze the glue outlet lip, and blocks the glue ejected from the communication pipeline cavity being extruded outward by the movement of the valve head, which can prevent the residual glue from being ejected under the impact of the rapid movement of the valve head and ensure no glue leakage, and the control is more precise.

[0013] Compared with the prior art, the present invention has the following beneficial effects: Multi-channel independent adjustment: Through the linkage of multiple glue outlet lips distributed in an array with the corresponding switching valves, precise scraping of complex contours is achieved.

[0014] Dynamic pressure closed-loop system: The pressure sensor monitors the flow channel pressure in real time, and combines with the PID algorithm to control the rotational speed of the gear pump and the pneumatic proportional valve. The pressure fluctuation range is compressed to ±2%, and the response time < 0.3 seconds.

[0015] When the number of opened switching valves changes, the system automatically adjusts the glue supply amount and the opening degree of the return valve to ensure that the pressure is stable at the set value.

[0016] Optimization of glue layer uniformity Laminar flow distribution technology: Through the design of the communication pipeline and the tapered glue outlet lip, the uniformity of the glue flow rate is increased to 98%, and the difference in the glue layer thickness < ±0.05 mm.

[0017] The diffusion structure of the glue outlet reduces turbulence and avoids the generation of bubbles.

[0018] Precise temperature control: The built-in heating cable cooperates with the PID temperature control module to maintain the temperature of the glue within the range of the set value ±1°C, preventing the glue from solidifying or overheating and carbonizing.

[0019] Improved system reliability Dual sealing mechanism: The mechanical seal at the top and the hydraulic seal of the ejector rod work together, reducing the glue leakage amount to <0.005 g / min and extending the service life of the sealing component to 500,000 operations.

[0020] The linkage design of the extrusion airbag and the expansion airbag synchronously seals the residual glue when closing the glue outlet lip, avoiding dripping.

[0021] Enhanced anti-interference ability: The buffer system composed of the balance pipe and the return spring can absorb the pressure impact during the operation of the on-off valve, improving the stability of the continuous operation of the equipment.

[0022] Precisely control the shape of the scraping surface, enabling the glue to be coated only in the actually required area, avoiding glue waste in subsequent cutting processes, improving the utilization efficiency of the glue, and reducing production costs. Brief description of the drawings

[0023] Figure 1 Is a three-dimensional schematic diagram of the present invention; Figure 2 Is a bottom view of the structure of the present invention; Figure 3 Is a front view of the present invention; Figure 4 Is a side view of the structure of the present invention; Figure 5 Of the present invention Figure 4 The enlarged partial view at A; Figure 6 Of the present invention Figure 4 The enlarged partial view at B; Figure 7 Of the present invention Figure 3 The enlarged partial view at C; Figure 8 Is the working flow chart of the prior art scraping gun; Figure 9 Is the working schematic diagram of the scraping gun of the present invention.

[0024] In the figure: 1. Scraping gun; 2. Glue outlet lip; 3. Return valve; 4. Pneumatic proportional valve; 5. Heating cable; 6. Pressure sensor; 7. On-off valve; 8. Air storage tank; 9. Return glue hose; 10. Glue inlet pipe; 11. Scraping plate; 12. Frame; 13. Top head; 14. Extrusion airbag; 15. Balance pipe; 16. Connecting pipe; 17. Embedded groove; 18. Expansion airbag; 19. Return spring; 20. Push plate; 21. Push rod; 22. Through groove; 23. Glue outlet. Detailed implementation manner

[0025] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manner, structure, features and their effects of the present invention as follows.

[0026] Please refer to Figures 1-7 , the present invention provides a technical solution: a device for precisely controlling the shape and uniformity of hot melt adhesive scraping, including two frames 12 and a scraping gun 1 fixed between the two frames 12. The bottom of the scraping gun 1 is fixedly connected with a scraping plate 11. The inner cavity of the scraping plate 11 is provided with a glue outlet lip 2 that is communicated with the inner cavity of the scraping gun 1 through a glue supply structure. The surface of the scraping gun 1 is fixedly connected with a pressure sensor 6 whose detection end extends into the inner cavity of the flow channel of the scraping gun 1. The pressure sensor 6 is used to detect the glue pressure inside the flow channel. One side of the scraping gun 1 is provided with an adjustment structure for turning on and off the glue supply structure. There are multiple adjustment structures and glue supply structures, and they are respectively arranged in one-to-one correspondence on the scraping gun 1. The glue supply to the multiple glue outlet lips 2 is adjusted through the corresponding adjustment structure and glue supply structure, so as to determine whether to perform scraping operation. Through the on-off combination control of different glue outlet lips 2, the effective control of the shape of the scraping surface can be precisely achieved. The left side of the scraping gun 1 is communicated with a glue machine through a glue inlet pipe 10 for transporting glue. The right side of the scraping gun 1 is communicated with a return glue hose 9 through a return valve 3 and a pneumatic proportional valve 4. The return valve 3 is used to control the return of glue, and the pneumatic proportional valve 4 receives the voltage signal of the pressure sensor 6 and then controls the return pressure of the return valve 3 for the pressure relief of the flow channel and the return of glue to the glue machine. A pressure sensor 6 is arranged inside, and its function is to detect the glue pressure inside in real time, and a standard pressure value is preset on the controller; When the number of opened on-off valves 7 increases, the glue pressure inside will decrease accordingly. At this time, the pressure sensor 6 detects the situation of the decreasing glue pressure and sends the input signal to the controller. After receiving the signal, the controller promptly outputs a control signal to increase the rotation speed of the gear pump. As the rotation speed of the gear pump increases, the amount of glue entering the scraping gun 1 increases, and the internal pressure gradually increases until the pressure increases to reach the preset standard value; When the number of opened switching valves 7 decreases, the internal glue pressure will increase. The pressure sensor feeds back the input signal of the increased glue pressure to the controller, and the controller responds quickly, outputting a signal to control the reduction of the rotational speed of the gear pump to reduce the internal pressure. At the same time, the controller outputs a signal to the return valve 3, causing the excess glue to return to the melting machine through the return glue pipe 9. Through this series of operations, the internal pressure gradually decreases until it reaches the standard set value; Through the above cyclic control process of the glue pressure, it can ensure that the internal glue pressure always remains stable. No matter how the number of switches of the switching valve 7 changes, it can ensure that the glue is evenly distributed on the scraping surface, thereby effectively improving the scraping quality.

[0027] The inner cavity of the scraping gun 1 is penetrated by a heating cable 5 connected to an external power supply. The heating cable 5 provides flow channel heating to prevent the glue from solidifying.

[0028] The glue supply structure includes a connecting pipe 16 arranged in the inner cavity of the scraping gun 1. One end of the connecting pipe 16 penetrates and extends into the inner cavity of the scraping gun 1. An outlet 23 is provided in the inner cavity of the scraping gun 1 above the glue outlet lip 2. The bottom end of the connecting pipe 16 is communicated with the outlet 23. The glue inside the flow channel of the scraping gun 1 is transported to the outlet 23 through the connecting pipe 16, and then after being dispersed through the outlet 23, it overflows through the glue outlet lip 2. Because the width at the glue outlet lip 2 becomes narrower, the glue will overflow under the impact and evenly cover the glue outlet lip 2 to ensure sufficient glue scraping.

[0029] The adjusting mechanism includes an air storage tank 8 fixed between two frames 12 and a switching valve 7 fixed on the surface of the scraping gun 1 and communicated with the air storage tank 8. The movable section of the switching valve 7 is fixedly connected with a top head 13 extending into the inner cavity of the scraping gun 1. When the top head 13 extends out, it abuts against the top end of the connecting pipe 16. The air storage tank 8 supplies air to the switching valve 7 to control the movement of the top head 13 of the switching valve 7, squeeze the connecting pipe 16, and open and close the glue outlet lip 2.

[0030] The glue inlet pipe 10 is communicated with the glue machine through a gear pump. The controller controls the rotational speed of the gear pump to adjust the glue supply amount.

[0031] The inner cavity of the scraping gun 1 is fixedly connected with an extrusion airbag 14 below the top head 13. An inner embedding groove 17 is provided in the inner cavity of the scraping plate 11. The inner cavity of the inner embedding groove 17 is fixedly connected with an expansion airbag 18 communicated with the extrusion airbag 14 through a balance pipe 15. A push plate 20 is slidably connected in the inner cavity of the inner embedding groove 17. One side of the expansion airbag 18 is fixedly connected with the push plate 20. A return spring 19 is fixedly connected in the inner cavity of the inner embedding groove 17. One end of the return spring 19 is fixedly connected with one side of the push plate 20. One side of the push plate 20 is fixedly connected with a top rod 21. One end of the top rod 21 penetrates and extends into the inner cavity of the scraping plate 11. A through groove 22 slidably connected with the top rod 21 is provided in the inner cavity of the scraping plate 11. The through groove 22 is communicated with the glue outlet lip 2.

[0032] A sealing plate that is fixedly connected to the end of the ejector rod 21 and slides in a sealed manner through the inner cavity of the through groove 22 is provided. The left and right movement of the ejector rod 21 drives the left and right movement of the sealing plate, realizing the extrusion sealing of the glue outlet lip. When in normal use and normal glue discharging, the glue enters the glue outlet lip 2. At this time, the through groove 22 is blocked by the sealing plate and normal glue discharging occurs. When the device obtains the relevant information of the product to be processed, the controller generates a corresponding control signal according to the product information and sends it to the corresponding switching valve 7. After receiving the signal, the switching valve 7 controls the opening and closing state of the glue outlet 23, thereby determining whether to perform the scraping operation. Through the combined control of the opening and closing of different glue outlets 23, the effective control of the shape of the scraping surface can be accurately realized. Each glue outlet 23 is connected to the switching valve 7, and the opening and closing actions of the glue outlet 23 are realized through the valve group signal. When closing the corresponding glue outlet lip 2, the switching valve 7 is supplied with gas by the air storage tank 8, controlling the movement of the top 13 of the switching valve 7, squeezing the communication pipeline 16 to open and close the glue outlet lip 2. At this time, the top 13 moves downward synchronously to squeeze the extrusion airbag 14, and the gas inside the extrusion airbag 14 enters the expansion airbag 18 through the balance pipeline 15. The expansion airbag 18 pushes the push plate 20 to slide in the embedded groove 17, driving the ejector rod 21 to move in the through groove 22, driving the sealing plate to move to squeeze the glue outlet lip 2, so as to block the glue ejected from the inner cavity of the communication pipeline 16 that is squeezed by the movement of the top 13, preventing the residual glue from being ejected under the impact of the rapid movement of the top 13 and ensuring no glue leakage, and the control is more accurate.

[0033] Figure 8 It is a working flow chart of a prior art scraping gun. Figure 9 It is a working schematic diagram of the scraping gun of the present invention.

[0034] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to it as equivalent embodiments within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A device for accurately controlling the shape and uniformity of hot melt adhesive scraping application, comprising two frames (12) and a scraping gun (1) fixed between the two frames (12), characterized in that: The bottom of the scraper gun (1) is fixedly connected to a scraper plate (11), the inner cavity of the scraper plate (11) is provided with a glue outlet lip (2) which is connected to the inner cavity of the scraper gun (1) through a glue supply structure, the surface of the scraper gun (1) is fixedly connected to a pressure sensor (6) whose detection end extends to the inner cavity of the flow channel of the scraper gun (1), and the pressure of glue inside the flow channel is detected by the pressure sensor (6), and one side of the scraper gun (1) is provided with an adjustment structure for turning on and off the glue supply structure; A plurality of adjustment structures and glue supply structures are provided, and are respectively provided on the scraper gun (1) in a one-to-one correspondence. The glue supply to the plurality of glue outlet lips (2) is adjusted by the corresponding adjustment structures and glue supply structures. The left side of the scraper gun (1) is connected to the glue machine via a glue inlet pipe (10) for conveying glue. The right side of the scraper gun (1) is connected to a return hose (9) via a return valve (3) and a pneumatic proportional valve (4). The return flow of glue is controlled by the return valve (3).

2. The device for accurately controlling the shape and uniformity of hot melt adhesive scraping application according to claim 1, characterized in that: A heating cable (5) connected to an external power source runs through the inner cavity of the scraping gun (1).

3. The device for accurately controlling the shape and uniformity of hot melt adhesive scraping application according to claim 1, characterized in that: The glue supply structure comprises a connecting pipe (16) arranged in the inner cavity of the scraper gun (1), one end of the connecting pipe (16) penetrates and extends to the inner cavity of the scraper gun (1), the inner cavity of the scraper gun (1) is provided with a glue outlet (23) located above the glue outlet lip (2), and the bottom end of the connecting pipe (16) is connected to the glue outlet (23).

4. The device for accurately controlling the shape and uniformity of hot melt adhesive scraping application according to claim 1, characterized in that: The regulating mechanism comprises an air storage tank (8) fixed between two frames (12) and a switch valve (7) fixed on the surface of the scraper gun (1) and connected to the air storage tank (8); a movable section of the switch valve (7) is fixedly connected to a top head (13) extending into the inner cavity of the scraper gun (1); and the top head (13) abuts against the top end of the connecting pipe (16) when extended.

5. The device for accurately controlling the shape and uniformity of hot melt adhesive scraping application according to claim 1, characterized in that: The glue inlet pipe (10) is connected to the glue machine via a gear pump, and the controller controls the speed of the gear pump to adjust the glue supply amount.

6. The device for accurately controlling the shape and uniformity of hot melt adhesive scraping application according to claim 1, characterized in that: The inner cavity of the scraper gun (1) is fixedly connected to an extrusion airbag (14) located below the head (13); the inner cavity of the scraper plate (11) is provided with an embedded groove (17); the inner cavity of the embedded groove (17) is fixedly connected to an expansion airbag (18) connected to the extrusion airbag (14) through a balance pipe (15); the inner cavity of the embedded groove (17) is slidably connected to a push plate (20); one side of the expansion airbag (18) is fixedly connected to the push plate (20); A return spring (19) is fixedly connected to the inner cavity of the embedded groove (17), one end of the return spring (19) is fixedly connected to one side of the push plate (20), one side of the push plate (20) is fixedly connected to a push rod (21), one end of the push rod (21) penetrates and extends to the inner cavity of the scraper plate (11), the inner cavity of the scraper plate (11) is provided with a through groove (22) slidably connected to the push rod (21), and the through groove (22) is communicated with the glue outlet lip (2).

7. The device for accurately controlling the shape and uniformity of hot melt adhesive scraping application according to claim 6, characterized in that: The end of the push rod (21) is fixedly connected to a sealing plate that penetrates the inner cavity of the groove (22) for sliding sealing. The push rod (21) moves left and right, driving the sealing plate to move left and right, thereby achieving extrusion sealing of the glue outlet lip.

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