A device for precisely controlling the shape and uniformity of hot melt adhesive scraping applications

Abstract

The present invention relates to a device for precisely controlling the shape and uniformity of hot melt adhesive scraping applications. The device comprises two frames and a scraper gun fixed between the two frames. A scraper plate is fixedly connected to the bottom of the scraper gun. The inner cavity of the scraper plate is provided with a glue outlet lip that communicates with the inner cavity of the scraper gun via a glue supply structure. A pressure sensor with a detection end extending into the inner cavity of the scraper gun flow channel is fixedly connected to the surface of the scraper gun. The present invention relates to the field of hot melt adhesive scraping technology. This device for precisely controlling the shape and uniformity of hot melt adhesive scraping applications achieves precise control of the shape of the scraping surface, ensuring that the glue is applied only to the areas actually needed, avoiding glue waste in subsequent cutting processes, improving glue utilization efficiency, and reducing production costs.

Description

Technical Field

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

[0002] In the existing technology, traditional hot melt adhesive scraping devices use a scraping gun to apply molten hot melt adhesive to the surface of leather of a specified width. The leather is loaded in roll form, and when it passes through the traditional scraping gun, its surface is scraped with glue of a standard width, and then it is unloaded in roll form. This traditional scraping method has obvious drawbacks. The leather surface is covered with glue of a fixed width. However, in subsequent processes, the leather needs to be cut into irregular shapes according to product requirements for bonding. This results in the remaining surface of the cut leather also being covered with glue, resulting in unnecessary waste of glue and increased production costs.

[0003] In the existing hot melt adhesive scraping application technology, it is difficult to accurately 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 glue scraping device. Through innovative design and control methods, precise control of the shape of the scraping surface is achieved, so that the glue is only applied to the area actually needed, avoiding glue waste in the subsequent cutting process, improving the efficiency of glue use, 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 accurately controlling the shape and uniformity of hot melt adhesive scraping application, which solves the above-mentioned problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device for accurately controlling the shape and uniformity of hot melt glue scraping application, comprising two frames and a scraper gun fixed between the two frames, the bottom of the scraper gun is fixedly connected to a scraper plate, the inner cavity of the scraper plate is provided with a glue outlet lip connected to the inner cavity of the scraper gun through a glue supply structure, the surface of the scraper gun is fixedly connected to a pressure sensor with a detection end extending to the inner cavity of the scraper gun flow channel, the glue pressure inside the flow channel is detected by the pressure sensor, one side of the scraper gun is provided with an adjustment structure for turning on and off the glue supply structure, multiple adjustment structures and glue supply structures are provided, and are respectively provided on the scraper gun in a one-to-one corresponding manner, through the corresponding The regulating structure and glue supply structure adjust the glue supply to multiple glue outlet lips, thereby deciding whether to perform the scraping operation. By controlling the switch combination of different glue outlet lips, the shape of the scraping surface can be accurately and effectively controlled. The left side of the scraper gun is connected to the glue machine through the glue inlet pipe for conveying glue. The right side of the scraper gun is connected to the return hose through the return valve and the pneumatic proportional valve. The return flow of glue is controlled by the return valve. The voltage signal of the pressure sensor is received by the pneumatic proportional valve and then the return pressure of the return valve is controlled. It is used to release the pressure of the flow channel and return the glue to the glue machine. A pressure sensor is provided inside, whose function is to detect the internal glue pressure in real time and pre-set the standard pressure value on the controller.

[0007] When the number of on-off valves opened increases, the internal glue pressure will decrease accordingly. 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 speed of the gear pump. As the speed of the gear pump increases, the amount of glue entering the scraper increases, and the internal pressure gradually increases until the pressure reaches the preset standard value.

[0008] When the number of on-off valves opened decreases, the internal glue pressure increases. The pressure sensor feeds back the input signal of the increased glue pressure to the controller, which responds quickly and outputs a signal to reduce the speed of the gear pump to reduce the internal pressure. At the same time, the controller outputs a signal to the return valve, allowing excess glue to return to the melter through the return hose. Through this series of operations, the internal pressure gradually decreases until it reaches the standard set value.

[0009] Through the above-mentioned cyclic control process of the glue pressure, it is possible to ensure that the internal glue pressure always remains stable. Regardless of how the number of on-off valves changes, it is possible to ensure that the glue is evenly distributed on the coating surface, thereby effectively improving the coating quality.

[0010] As a further solution of the present invention: a heating cable connected to an external power supply runs through the inner cavity of the scraper gun, and the heating cable provides flow channel heating to prevent the glue from solidifying.

[0011] As a further solution of the present invention: the glue supply structure includes a connecting pipe arranged in the inner cavity of the scraper gun, one end of the connecting pipe passes through and extends to the inner cavity of the scraper gun, the inner cavity of the scraper gun is provided with a glue outlet located above the glue outlet lip, the bottom end of the connecting pipe is connected to the glue outlet, the glue inside the scraper gun flow channel is transported to the glue outlet through the connecting pipe, and then dispersed through the glue outlet and overflows through the glue outlet lip. Because the width of the glue outlet lip is narrowed, the glue will overflow under impact and evenly cover the glue outlet lip to ensure sufficient scraping of glue.

[0012] As a further solution of the present invention: the adjustment mechanism includes an air tank fixed between the two frames and a switch valve fixed on the surface of the scraper gun and connected to the air tank. The movable section of the switch valve is fixedly connected to a plug extending into the inner cavity of the scraper gun. When the plug is extended, it abuts against the top of the connecting pipe. The switch valve is supplied with air through the air tank to control the movement of the switch valve plug, and the connecting pipe is squeezed to open and close the glue outlet lip.

[0013] As a further solution of the present invention: the glue inlet pipe is connected to the glue machine through a gear pump, and the controller controls the speed of the gear pump to adjust the glue supply amount.

[0014] As a further solution of the present invention: the inner cavity of the scraper gun is fixedly connected to an extrusion airbag located below the head, the inner cavity of the scraper plate is provided with an embedded groove, the inner cavity of the embedded groove is fixedly connected to an expansion airbag connected to the extrusion airbag through a balancing pipe, the inner cavity of the embedded groove is slidably connected to a push plate, one side of the expansion airbag is fixedly connected to the push plate, the inner cavity of the embedded groove is fixedly connected to a return spring, one end of the return spring is fixedly connected to one side of the push plate, one side of the push plate is fixedly connected to a push rod, one end of the push rod passes through and extends to the inner cavity of the scraper plate, the inner cavity of the scraper plate is provided with a through groove slidably connected to the push rod, and the through groove is connected to the glue outlet lip.

[0015] As a further solution of the present invention: the end of the push rod is fixedly connected to a sealing plate that penetrates the inner cavity of the groove and slides to seal. The left and right movement of the push rod drives the sealing plate to move left and right to realize the extrusion sealing of the glue outlet lip. During use, when the glue is discharged normally, the glue enters the glue outlet lip. At this time, the through groove is blocked by the sealing plate and the glue is discharged normally. When the equipment 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 switch valve. After receiving the signal, the switch valve controls the switch state of the glue outlet to determine whether to perform the scraping operation. By controlling the switch combination of different glue outlets, the shape of the scraping surface can be accurately and effectively controlled. Each glue outlet is connected to the corresponding switch valve. The on-off valves are connected, and the opening and closing of the glue outlet is realized through the valve group signal. When the corresponding glue outlet lip is closed, the on-off valve is supplied with air through the air tank to control the movement of the on-off valve head, and the connecting pipe is squeezed to open and close the glue outlet lip. At this time, the synchronous head moves downward to squeeze the extrusion airbag, and the gas inside the extrusion airbag enters the expansion airbag through the balance pipe. The expansion airbag pushes the push plate to slide in the embedded groove, drives the ejector rod to move in the through groove, and drives the sealing plate to move to squeeze the glue outlet lip, so as to block the glue that is squeezed out of the inner cavity of the connecting pipe and prevent the residual glue from being ejected by the impact under the rapid movement of the head, so as to ensure that there will be no glue leakage and the control is more precise.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Multi-channel independent adjustment:

[0018] Through the linkage of multiple glue discharging lips distributed in an array and the corresponding switch valves, precise scraping of complex contours can be achieved.

[0019] Dynamic pressure closed loop system:

[0020] The pressure sensor monitors the flow channel pressure in real time and combines the PID algorithm to control the gear pump speed and the pneumatic proportional valve. The pressure fluctuation range is compressed to ±2%, and the response time is less than 0.3 seconds.

[0021] When the number of on-off valves opened changes, the system automatically adjusts the glue supply and the opening of the return valve to ensure that the pressure remains stable at the set value.

[0022] Optimization of adhesive layer uniformity

[0023] Laminar flow distribution technology:

[0024] Through the design of connecting pipes and tapered glue outlet lip, the uniformity of glue flow rate is improved to 98%, and the difference in glue layer thickness is less than ±0.05mm.

[0025] The diffusion structure of the glue outlet reduces turbulence and avoids the generation of bubbles.

[0026] Precise temperature control:

[0027] The built-in heating cable is combined with the PID temperature control module to maintain the glue liquid temperature within the set value ±1°C to prevent the glue liquid from solidifying or overheating and carbonization.

[0028] Improved system reliability

[0029] Double sealing mechanism:

[0030] The mechanical seal of the ejector head and the hydraulic seal of the ejector rod work together to reduce glue leakage to <0.005g / min and extend the life of the sealing component to 500,000 operations.

[0031] The linkage design of the extrusion airbag and the expansion airbag can simultaneously block the residual glue when closing the glue lip to avoid dripping.

[0032] Enhanced anti-interference capability:

[0033] The buffer system composed of the balance pipe and the return spring can absorb the pressure shock when the switch valve is actuated, thereby improving the stability of the continuous operation of the equipment.

[0034] The shape of the scraping surface can be precisely controlled so that the glue is only applied to the area where it is actually needed, thus avoiding glue waste in the subsequent cutting process, improving the efficiency of glue use and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0036] Figure 2 A bottom view of the structure of the present invention;

[0037] Figure 3 It is the front view of the present invention;

[0038] Figure 4 It is a side view of the structure of the present invention;

[0039] Figure 5 For the present invention Figure 4 A partial enlarged view of point A in the middle;

[0040] Figure 6 For the present invention Figure 4 A partial enlarged view of point B in the middle;

[0041] Figure 7 For the present invention Figure 3 A partial enlarged view of point C in the middle;

[0042] Figure 8 This is a flowchart of the scraping gun working process in the prior art;

[0043] Figure 9 It is a working schematic diagram of the scraping gun of the present invention.

[0044] In the figure: 1. scraper gun; 2. glue outlet lip; 3. return valve; 4. pneumatic proportional valve; 5. heating cable; 6. pressure sensor; 7. switch valve; 8. air tank; 9. return hose; 10. glue inlet hose; 11. scraper; 12. frame; 13. ejector; 14. extrusion airbag; 15. balance pipe; 16. connecting pipe; 17. embedded groove; 18. expansion airbag; 19. reset spring; 20. push plate; 21. ejector rod; 22. through groove; 23. glue outlet. DETAILED DESCRIPTION

[0045] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0046] See also Figure 1-7 The present invention provides a technical solution: a device for accurately controlling the shape and uniformity of hot melt adhesive scraping application, comprising two frames 12 and a scraper gun 1 fixed between the two frames 12, a scraper plate 11 fixedly connected to the bottom of the scraper gun 1, an inner cavity of the scraper plate 11 is provided with a glue outlet lip 2 connected to the inner cavity of the scraper gun 1 through a glue supply structure, a pressure sensor 6 with a detection end extending to the inner cavity of the flow channel of the scraper gun 1 is fixedly connected to the surface of the scraper gun 1, the glue pressure inside the flow channel is detected by the pressure sensor 6, an adjustment structure for turning on and off the glue supply structure is provided on one side of the scraper gun 1, multiple adjustment structures and glue supply structures are provided, and are respectively provided on the scraper gun 1 in one-to-one correspondence, through the corresponding adjustment structures The glue supply structure adjusts the glue supply to the multiple glue outlet lips 2, thereby deciding whether to perform the scraping operation. By controlling the switch combination of different glue outlet lips 2, the shape of the scraping surface can be accurately and effectively controlled. The left side of the scraper gun 1 is connected to the glue machine through the glue inlet pipe 10 for conveying glue. The right side of the scraper gun 1 is connected to the return hose 9 through the return valve 3 and the pneumatic proportional valve 4. The return of glue is controlled by the return valve 3. The voltage signal of the pressure sensor 6 is received by the pneumatic proportional valve 4 and then the return pressure of the return valve 3 is controlled. It is used to release the pressure of the flow channel and return the glue to the glue machine. A pressure sensor 6 is provided inside. Its function is to detect the internal glue pressure in real time and pre-set the standard pressure value on the controller.

[0047] When the number of on-off valves 7 opened increases, the internal glue pressure will decrease accordingly. At this time, the pressure sensor 6 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 speed of the gear pump. As the speed of the gear pump increases, the amount of glue entering the scraper gun 1 increases, and the internal pressure gradually increases until the pressure reaches a preset standard value.

[0048] When the number of on-off valves 7 opened decreases, the internal glue pressure increases. The pressure sensor feeds back the input signal of the increased glue pressure to the controller, which responds quickly and outputs a signal to reduce the speed of the gear pump to reduce the internal pressure. At the same time, the controller outputs a signal to the return valve 3, allowing excess glue to return to the melter through the return hose 9. Through this series of operations, the internal pressure gradually decreases until it reaches the standard set value.

[0049] Through the above-mentioned cycle control process of glue pressure, it can be ensured that the internal glue pressure always remains stable. No matter how the number of switches of the switch valve 7 changes, it can be ensured that the glue is evenly distributed on the coating surface, thereby effectively improving the coating quality.

[0050] A heating cable 5 connected to an external power source is passed through the inner cavity of the scraper gun 1 , and the heating cable 5 is used to provide flow channel heating to prevent the glue from solidifying.

[0051] The glue supply structure includes a connecting pipe 16 arranged in the inner cavity of the scraper gun 1, one end of the connecting pipe 16 passes through and extends to the inner cavity of the scraper gun 1, and the inner cavity of the scraper gun 1 is provided with a glue outlet 23 located above the glue outlet lip 2. The bottom end of the connecting pipe 16 is connected to the glue outlet 23. The glue inside the flow channel of the scraper gun 1 is transported to the glue outlet 23 through the connecting pipe 16, and then dispersed through the glue outlet 23 and overflowed through the glue outlet lip 2. Because the width of the glue outlet lip 2 is narrowed, the glue will overflow under impact and evenly cover the glue outlet lip 2 to ensure sufficient scraping of glue.

[0052] The regulating mechanism includes an air tank 8 fixed between two frames 12 and a switch valve 7 fixed on the surface of the scraper 1 and connected to the air tank 8. The movable section of the switch valve 7 is fixedly connected to a plug 13 extending into the inner cavity of the scraper 1. When the plug 13 is extended, it abuts against the top of the connecting pipe 16. The air is supplied to the switch valve 7 through the air tank 8 to control the movement of the plug 13 of the switch valve 7, and the connecting pipe 16 is squeezed to open and close the glue lip 2.

[0053] The glue inlet pipe 10 is connected to the glue machine through a gear pump, and the controller controls the speed of the gear pump to adjust the glue supply amount.

[0054] The inner cavity of the scraper gun 1 is fixedly connected to the extrusion airbag 14 located below the head 13, and 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 the expansion airbag 18 connected to the extrusion airbag 14 through the balancing pipe 15. The inner cavity of the embedded groove 17 is slidably connected to the push plate 20. One side of the expansion airbag 18 is fixedly connected to the push plate 20. The inner cavity of the embedded groove 17 is fixedly connected to a return spring 19. 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 passes through 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. The through groove 22 is connected to the glue outlet lip 2.

[0055] The end of the push rod 21 is fixedly connected to a sealing plate that slides and seals the inner cavity of the through groove 22. The left and right movement of the push rod 21 drives the sealing plate to move left and right to achieve extrusion and sealing of the glue outlet lip. During use, when the glue is discharged normally, the glue enters the glue outlet lip 2. At this time, the through groove 22 is blocked by the sealing plate and the glue is discharged normally. After the equipment obtains the relevant information of the product to be processed, the controller generates a corresponding control signal based on the product information and sends it to the corresponding switch valve 7. After receiving the signal, the switch valve 7 controls the switch state of the glue outlet 23 to determine whether to perform the scraping operation. By controlling the switch combination of different glue outlets 23, the shape of the scraping surface can be accurately and effectively controlled. Each glue outlet 23 is connected to the switch valve 7, and the valve group signal is used to realize the glue discharge. The opening and closing action of the glue port 23, when the corresponding glue outlet lip 2 is closed, the switch valve 7 is supplied with air through the air tank 8, the switch valve 7 is controlled to move the head 13, the connecting pipe 16 is squeezed to open and close the glue outlet lip 2, and at this time the synchronous head 13 moves downward to squeeze the extrusion airbag 14, and the internal gas of the extrusion airbag 14 enters the expansion airbag 18 through the balance pipe 15, and the expansion airbag 18 pushes the push plate 20 to slide in the embedded groove 17, driving the push 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 move the head 13 and the inner cavity of the connecting pipe 16 to be squeezed and sprayed out to block the glue, which can prevent the residual glue from being ejected by the impact under the rapid movement of the head 13, ensuring that there will be no glue leakage and more precise control.

[0056] Figure 8 This is the working process diagram of the scraping gun in the existing technology. Figure 9 It is a working schematic diagram of the scraping gun of the present invention.

[0057] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A device for precisely controlling the shape and uniformity of a hot melt adhesive scraper application, comprising two frames (12) and a scraper 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), and the inner cavity of the scraper plate (11) is provided with a glue outlet lip (2) that 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). The pressure of the glue inside the flow channel is detected by the pressure sensor (6). One side of the scraper gun (1) is provided with an adjustment structure for turning the glue supply structure on and off. The regulating structure and the glue supply structure are provided in plurality and are respectively provided on the scraper (1) in a one-to-one correspondence. The glue supply to the plurality of glue outlet lips (2) is regulated by the corresponding regulating structure and glue supply structure. The left side of the scraper (1) is connected to the glue machine through the glue inlet pipe (10) for conveying glue. The right side of the scraper (1) is connected to the return hose (9) through the return valve (3) and the pneumatic proportional valve (4). The return of glue is controlled by the return valve (3). The inner cavity of the scraper (1) is fixedly connected to the extrusion air bag (14) located below the head (13). The scraper The inner cavity of (11) is provided with an embedded groove (17), the inner cavity of the embedded groove (17) is fixedly connected with an expansion airbag (18) which is connected to the extrusion airbag (14) through a balance pipe (15), the inner cavity of the embedded groove (17) is slidably connected with a push plate (20), one side of the expansion airbag (18) is fixedly connected to the push plate (20), the inner cavity of the embedded groove (17) is fixedly connected with a return spring (19), one end of the return spring (19) is fixedly connected to one side of the push plate (20), and one side of the push plate (20) is fixedly connected with a push rod (21 ), one end of the push rod (21) penetrates and extends to the inner cavity of the scraper (11), the inner cavity of the scraper (11) is provided with a through groove (22) slidably connected to the push rod (21), the through groove (22) is communicated with the glue outlet lip (2), the glue supply structure includes a connecting pipe (16) arranged in the inner cavity of the scraper (1), one end of the connecting pipe (16) penetrates and extends to the inner cavity of the scraper (1), the inner cavity of the scraper (1) is provided with a glue outlet (23) located above the glue outlet lip (2), the bottom end of the connecting pipe (16) is connected to the glue outlet (23) is connected, and the regulating mechanism includes an air tank (8) fixed between the two frames (12) and a switch valve (7) fixed on the surface of the scraper (1) and connected to the air tank (8), the movable section of the switch valve (7) is fixedly connected with a top head (13) extending to the inner cavity of the scraper (1), and the top head (13) abuts against the top end of the connecting pipe (16) when it is extended, and the end of the push rod (21) is fixedly connected with a sealing plate that slides and seals the inner cavity of the groove (22), and the left and right movement of the push rod (21) drives the sealing plate to move left and right, thereby realizing the extrusion sealing of the glue outlet lip.

2. The device for accurately controlling the shape and uniformity of hot melt adhesive scraping 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 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.

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