An automatic gluing device and method for the bonding surface of a multilayer aluminum alloy sheet of an automobile

Abstract

This invention relates to the field of automotive multi-layer aluminum alloy sheet processing technology, and more particularly to an automatic adhesive application device and method for the bonding surface of automotive multi-layer aluminum alloy sheets. The device includes an adhesive applicator driven by a robotic arm and an adhesive applicator head installed at the bottom of the applicator. The lower end of the applicator is fixedly connected to the adhesive applicator head for applying adhesive to the multi-layer aluminum alloy sheet used to make the machine cover. A scraper is installed on the side corresponding to the direction of travel of the adhesive applicator head. The upper end of the scraper is connected to a negative pressure collection box via a glue extraction tube. A suction control unit is installed on one side of the middle of the glue extraction tube. The suction control unit is controlled by a magnetic spring and the floating of the scraper. The suction control unit includes an elliptical rod, with a through-rotating shaft fixedly connected to the middle of the elliptical rod. This invention employs pure mechanical linkage feedback. When the amount of adhesive at the scraper is low and the resistance is small, the hose is automatically squeezed to cut off or reduce the negative pressure, preventing damage to the uncured bottom adhesive layer. When the amount of adhesive is high and the resistance is large, the hose is automatically released to restore suction, efficiently recovering excess adhesive.

Description

Technical Field

[0001] This invention relates to an automatic adhesive application device and method for the bonding surface of multi-layer aluminum alloy sheets for automobiles, belonging to the field of processing technology for multi-layer aluminum alloy sheets for automobiles. Background Technology

[0002] Currently, in the adhesive coating process for the bonding surfaces of multi-layer aluminum alloy sheets in automobiles, a robotic arm is typically used to drive the adhesive applicator along the edge of the sheet, and a scraper is set on the corresponding side of the applicator head's travel direction to smooth the adhesive layer applied to the hood surface.

[0003] To keep the glue application station clean and recover the scraped-off excess glue, most existing equipment connects a glue extraction tube above the scraper and uses a constant negative pressure provided by a negative pressure collection box to suck the excess glue collected by the scraper into the collection box. Some high-end equipment also uses electronic sensors in conjunction with solenoid valves to adjust the suction force in the glue extraction tube based on the real-time detection of the glue volume.

[0004] However, existing technologies have a significant technical drawback in practical applications: in the initial stage of adhesive application, when the surface of the sheet metal is uneven, causing gap changes, or when there is little residual adhesive on the scraper surface, if a constant high-intensity negative pressure suction is still used, it is very easy to cause excessive suction at the scraper. This excessive negative pressure will directly act on the surface of the freshly applied and uncured adhesive layer, forcibly sucking up the adhesive on the surface of the adhesive layer, pulling out pits or strings, thereby seriously damaging the flatness and coating accuracy of the adhesive layer, directly affecting the subsequent bonding strength of multi-layer aluminum alloy sheets. Therefore, it is urgent to improve an automatic adhesive application device and method for the bonding surface of automotive multi-layer aluminum alloy sheets to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic adhesive application device and method for the bonding surface of multi-layer aluminum alloy sheets for automobiles, in order to solve a prominent technical defect in the practical application of the prior art: in the initial stage of adhesive application, when the surface of the sheet is uneven and the gap changes, or when there is little residual adhesive on the scraper surface, if a constant high-intensity negative pressure suction is still used, it is very easy to cause excessive suction at the scraper. This excessive negative pressure will directly act on the surface of the freshly coated and uncured adhesive layer, forcibly sucking up the adhesive on the surface of the adhesive layer, pulling out pits or strings, thereby seriously damaging the flatness and coating accuracy of the adhesive layer, and directly affecting the subsequent bonding strength of the multi-layer aluminum alloy sheet.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An automatic adhesive application device and method for bonding the surface of multi-layer aluminum alloy sheets for automobiles includes an adhesive applicator driven by a robotic arm and an adhesive applicator head installed at the bottom of the applicator. The lower end of the applicator is fixedly connected to the adhesive applicator head for applying adhesive to the multi-layer aluminum alloy sheet used to make the machine cover. A scraper is installed on the side corresponding to the direction of travel of the adhesive applicator head. The upper end of the scraper is connected to a negative pressure collection box via a glue extraction tube. A suction control unit is installed on one side of the glue extraction tube. The suction control unit is controlled by a magnetic spring and the floating of the scraper. The suction control unit includes an elliptical rod with a through-rotating shaft fixedly connected to its center. Side plates are rotatably connected to the outer sides of both ends of the rotating shaft. Gears are fixedly connected to both ends of the rotating shaft, with the upper end of the gear meshing with teeth on the lower end of a guide plate. The end of the guide plate away from the teeth is fixedly connected to a movable guide shaft of a magnetic spring via a linkage plate, and the other side of the movable guide shaft of the magnetic spring is fixedly connected to the scraper.

[0008] Furthermore, the adhesive applicator is used to apply an adhesive layer to the edge surface of the multi-layer aluminum alloy sheet machine cover, and the adhesive applicator is located at the upper end of the multi-layer aluminum alloy sheet machine cover.

[0009] Furthermore, a scraper positioning unit is fixedly connected to one side of the glue applicator by bolts. The scraper positioning unit includes a positioning plate. The inner end of the positioning plate has a pipe through hole for positioning the glue extraction tube and a guide hole for positioning the guide plate. The bottom end of the positioning plate has a mounting hole for positioning the magnetic spring.

[0010] Furthermore, the negative pressure collection box is fixedly connected to the end of the positioning plate away from the glue applicator, and the glue inlet of the negative pressure collection box is fixedly connected to the top of the glue extraction tube.

[0011] Furthermore, the scraper includes a plate body, the plate body has a J-shaped flow channel that corresponds one-to-one with the glue extraction tube, the lower end of the plate body has a glue collection groove, both ends of the glue collection groove have glue blocking grooves, and the upper end of the glue collection groove is fixedly connected to a glue blocking plate.

[0012] Furthermore, the flow channel is provided in multiple ways, and each flow channel corresponds to a glue extraction tube. The flow channels at both ends are connected to the glue blocking groove, and the flow channel opening is located at the lower end of the glue collection groove.

[0013] Furthermore, the glue extraction tube includes two rigid tube sections. One rigid tube passes through the positioning plate and is connected to the negative pressure collection box, while the other rigid tube is connected to the flow channel. The two rigid tube sections are connected by a flexible tube, and the end of the flexible tube is connected to the positioning plate by a snap-fit. The middle part of the flexible tube is located on one side of the elliptical rod.

[0014] Furthermore, the elliptical rod is in close contact with the middle of the hose, the side plate is fixedly connected to the positioning plate, the guide plate is slidably connected to the positioning plate through the guide hole, and there are two guide plates, which are parallel to each other.

[0015] Furthermore, the magnetic spring includes a fixed housing for connecting with the mounting hole and a movable guide shaft for connecting with the scraper and the linkage plate.

[0016] Furthermore, it includes the following steps:

[0017] Step 1: Drive the robotic arm to move the glue applicator, so that the glue applicator head moves along the edge of the multi-layer aluminum alloy sheet cover and applies a glue layer to the upper surface of the cover.

[0018] Step 2: While the applicator head is moving forward to apply adhesive, the scraper located on the side corresponding to its direction of travel is pressed against and smoothed on the surface of the adhesive layer under the elastic action of the magnetic spring. The excess adhesive collected by the scraper is collected through the adhesive collection groove, adhesive blocking groove and flow channel connected inside.

[0019] Step 3: When there is too much adhesive on the scraper surface, creating significant resistance, the scraper moves towards the positioning plate under the resistance, causing the linkage plate fixedly connected to it to move synchronously. The linkage plate pulls the guide plate along the guide hole, and the toothed drive gear at the lower end of the guide plate rotates. The gear drives the elliptical rod to rotate synchronously through the shaft. During the rotation, the elliptical rod changes the degree of compression on the hose based on the eccentric characteristics of its elliptical cross section, thereby automatically adjusting the suction force in the glue extraction tube. When there is less adhesive on the scraper surface and less resistance, the scraper is maintained or reset to the normal scraping position under the action of the magnetic spring. At this time, the elliptical rod rotates to the compression phase, weakening or stopping the suction force to prevent damage to the adhesive layer due to excessive negative pressure.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention employs a purely mechanical linkage feedback mechanism. When the amount of adhesive at the scraper is low and the resistance is small, the hose is automatically squeezed to cut off or reduce the negative pressure, preventing damage to the uncured bottom adhesive layer. When the amount of adhesive is high and the resistance is large, the hose is automatically released to restore suction and efficiently recover excess adhesive. This structure requires no electronic sensors, responds instantly, and is low in cost. While ensuring the smoothness of the adhesive scraping, it effectively guarantees the integrity of the adhesive layer and the final bonding quality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the installation position structure of the scraper positioning unit of the present invention;

[0024] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0025] Figure 4 This is a schematic diagram of the connection structure between the glue applicator and the scraper positioning unit of the present invention;

[0026] Figure 5 This is a schematic diagram of the positioning plate structure of the present invention;

[0027] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B;

[0028] Figure 7 This is a schematic diagram of the scraper structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the adhesive extraction tube structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the installation position of the suction control unit of the present invention;

[0031] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point D;

[0032] Figure 11 This is a schematic diagram of the suction control unit structure of the present invention;

[0033] Figure 12 For the present invention Figure 11 Enlarged structural diagram at point C.

[0034] In the diagram, 1. Glue applicator; 2. Scraper positioning unit; 21. Positioning plate; 22. Pipe perforation; 23. Guide hole; 24. Mounting hole; 3. Multi-layer aluminum alloy sheet cover; 4. Glue layer; 5. Glue applicator head; 6. Negative pressure collection box; 7. Scraper; 71. Plate body; 72. Flow channel; 73. Glue blocking groove; 74. Glue collection groove; 75. Glue blocking plate; 8. Glue extraction tube; 81. Rigid tube; 82. Flexible tube; 9. Suction control unit; 91. Elliptical rod; 92. Rotating shaft; 93. Gear; 94. Side plate; 95. Guide plate; 96. Tooth; 10. Magnetic spring; 11. Linkage plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figures 1-12 As shown, this embodiment provides an automatic adhesive application device for the bonding surface of multi-layer aluminum alloy sheets for automobiles. It includes an adhesive applicator 1 driven by a robotic arm and an adhesive applicator head 5 installed at the bottom of the adhesive applicator 1. The adhesive applicator head 5, used for applying adhesive to the multi-layer aluminum alloy sheet cover 3, is fixedly connected to the lower end of the adhesive applicator 1. A scraper 7 is installed on the side corresponding to the direction of travel of the adhesive applicator head 5. A negative pressure collection box 6 is connected to the upper end of the scraper 7 via a glue extraction tube 8. A suction control unit 9 is installed on one side of the middle of the glue extraction tube 8. The suction control unit 9 is controlled by a magnetic spring 10 and the floating of the scraper 7. The suction control unit 9 includes an elliptical rod 91, with a through-rotating shaft 92 fixedly connected to the middle of the elliptical rod 91. Side plates 94 are rotatably connected to the outer sides of both ends of the rotating shaft 92. Teeth are fixedly connected to both ends of the rotating shaft 92. The upper end of the wheel 93 and gear 93 meshes with the teeth 96 set at the lower end of the guide plate 95. The end of the guide plate 95 away from the teeth 96 is fixedly connected to the movable guide shaft of the magnetic spring 10 through the linkage plate 11. The other side of the movable guide shaft of the magnetic spring 10 is fixedly connected to the scraper 7. By mechanically linking the floating state of the magnetic spring 10 and the scraper 7, and forming a suction control unit 9 through the linkage plate 11, guide plate 95, gear 93, rotating shaft 92 and elliptical rod 91, a purely mechanical automatic feedback of the change in scraping resistance is realized. This structure can dynamically adjust the negative pressure suction in the glue extraction tube 8 according to the displacement of the scraper 7 without additional electronic control sensors. It has the advantages of compact structure, high reliability and sensitive response, thus effectively ensuring the uniformity of glue layer thickness during the glue application process.

[0037] In one possible embodiment, the adhesive applicator 5 is used to apply the adhesive layer 4 to the edge surface of the multi-layer aluminum alloy sheet machine cover 3. The adhesive applicator 5 is located at the upper end of the multi-layer aluminum alloy sheet machine cover 3. By precisely setting the adhesive applicator 5 at the upper edge of the machine cover 3, reliable application of the adhesive layer 4 to the edge surface of the machine cover 3 is ensured in a fixed point and quantity. The operation field of view is clear and the position is easy to control, which can effectively improve the strength and sealing quality of subsequent interlayer bonding of aluminum alloy sheets.

[0038] In one possible embodiment, a scraper positioning unit 2 is fixedly connected to one side of the glue applicator 1 by bolts. The scraper positioning unit 2 includes a positioning plate 21. The inner end of the positioning plate 21 is provided with a pipe through hole 22 for positioning the glue extraction tube 8 and a guide hole 23 for positioning the guide plate 95. The bottom end of the positioning plate 21 is provided with a mounting hole 24 for positioning the magnetic spring 10. By setting the integrated design of the scraper positioning unit 2, the pipe through hole 22, the guide hole 23 and the mounting hole 24 on the positioning plate 21 achieve precise positioning and installation of the glue extraction tube 8, the guide plate 95 and the magnetic spring 10, respectively.

[0039] In one possible embodiment, the negative pressure collection box 6 is fixedly connected to the end of the positioning plate 21 away from the glue applicator 1, and the glue inlet of the negative pressure collection box 6 is fixedly connected to the top of the glue extraction tube 8. By cleverly fixing the negative pressure collection box 6 to the side end of the positioning plate 21 away from the glue applicator 1, the external idle space of the equipment is fully utilized. At the same time, the stable connection between the glue inlet and the top of the glue extraction tube 8 ensures the sealing of the negative pressure air path and facilitates the subsequent centralized cleaning of the collected waste glue.

[0040] In one possible embodiment, the scraper 7 includes a plate body 71. Inside the plate body 71, there are J-shaped flow channels 72 that correspond one-to-one with the glue extraction tube 8. A glue collection groove 74 is provided at the lower end of the plate body 71. Both ends of the glue collection groove 74 are provided with glue blocking grooves 73. A glue blocking plate 75 is fixedly connected to the upper end of the glue collection groove 74. By reasonably arranging the J-shaped flow channels 72 inside the plate body 71 of the scraper 7, and providing the glue collection groove 74 and glue blocking groove 73 at the bottom of the scraper, combined with the blocking effect of the glue blocking plate 75, the excess glue scraped off can be efficiently collected and guided to the location of the glue extraction tube 8. The addition of the glue blocking groove 73 effectively prevents the glue from overflowing to the left and right ends of the scraper 7.

[0041] In one possible embodiment, multiple flow channels 72 are provided, and each flow channel 72 corresponds to a glue extraction tube 8. The flow channels 72 at both ends are connected to the glue blocking groove 73. The opening of the flow channel 72 is located at the lower end of the glue collection groove 74. By setting multiple flow channels 72 and ensuring that they correspond one-to-one with the glue extraction tube 8, and positioning the opening of the flow channel 72 at the lower end of the glue collection groove 74, combined with the connection between the flow channels 72 at both ends and the glue blocking groove 73, it is ensured that the residual glue at any position along the width direction of the scraper 7 can be smoothly introduced. In particular, the residual glue in the glue blocking groove 73 can also be effectively sucked out through the end connection structure, completely eliminating the hidden danger of glue accumulating and solidifying at the corners.

[0042] In one possible embodiment, the glue extraction tube 8 includes two sections of rigid tube 81. One section of rigid tube 81 passes through the positioning plate 21 and is connected to the negative pressure collection box 6. The other section of rigid tube 81 is connected to the flow channel 72. The two sections of rigid tube 81 are connected by a flexible tube 82. The end of the flexible tube 82 is connected to the positioning plate 21 by a snap-fit. The middle part of the flexible tube 82 is located on one side of the elliptical rod 91. The glue extraction tube 8 adopts a segmented combination of rigid tube 81 and flexible tube 82. The rigid tube 81 ensures a firm and stable interface with the negative pressure collection box 6 and the flow channel 72, while the flexible tube 82 can perfectly adapt to the floating displacement of the scraper 7 caused by the undulation of the workpiece surface.

[0043] In one possible embodiment, the elliptical rod 91 is tightly attached to the middle of the hose 82, the side plate 94 is fixedly connected to the positioning plate 21, and the guide plate 95 is slidably connected to the positioning plate 21 through the guide hole 23. There are two guide plates 95, which are parallel to each other. By tightly attaching the elliptical rod 91 to the middle of the hose 82 and relying on the stable connection between the side plate 94 and the positioning plate 21, when the scraper 7 is displaced, the parallel double guide plates 95 slide smoothly and without deviation in the guide hole 23, ensuring the stability and accuracy of the meshing between the gear 93 and the teeth 96. Ultimately, this ensures that the elliptical rod 91 rotates precisely at a predetermined angle, making the squeezing action on the hose 82 accurate and reliable, and avoiding jamming or empty stroke during the movement.

[0044] In one possible embodiment, the magnetic spring 10 includes a fixed housing for connecting to the mounting hole 24 and a movable guide shaft for connecting to the scraper 7 and the linkage plate 11. By designing the magnetic spring 10 as a combination of the fixed housing and the movable guide shaft, its installation position is ensured to be firm and stable. The movable guide shaft connects both the scraper 7 and the linkage plate 11, giving the magnetic spring 10 a "dual-purpose" function. It can provide a constant scraping pre-pressure to the scraper 7 under normal conditions, and can also sensitively transmit the displacement signal of the scraper 7 to the linkage plate 11, playing an important role in integrating elastic reset and precision transmission.

[0045] like Figures 1-12 As shown in this embodiment, the principle of an automatic adhesive application method for the bonding surface of multi-layer aluminum alloy sheets for automobiles is as follows:

[0046] Includes the following steps:

[0047] Step 1: Drive the robotic arm to move the glue applicator 1, so that the glue applicator head 5 moves along the edge of the multi-layer aluminum alloy sheet cover 3 and coats the upper surface of the cover 3 with glue layer 4.

[0048] Step 2: While the glue applicator 5 is applying glue, the scraper 7 located on the side corresponding to its direction of travel is pressed against and scraped flat on the surface of the glue layer 4 under the elastic action of the magnetic spring 10. The excess glue collected by the scraper 7 is collected through the glue collection groove 74, glue blocking groove 73 and flow channel 72 connected inside it.

[0049] Step 3: When there is too much adhesive on the surface of the scraper 7 and it generates a large resistance, the scraper 7 moves towards the positioning plate 21 under the action of resistance, and drives the linkage plate 11 fixedly connected to it to move synchronously; the linkage plate 11 pulls the guide plate 95 to slide along the guide hole 23, and the teeth 96 set at the lower end of the guide plate 95 drive the gear 93 to rotate. The gear 93 drives the elliptical rod 91 to rotate synchronously through the rotating shaft 92; during the rotation, the elliptical rod 91 changes the degree of squeezing on the hose 82 based on the eccentric characteristics of its elliptical cross section, thereby automatically adjusting the suction force in the glue extraction tube 8; when there is less adhesive on the surface of the scraper 7 and the resistance is small, the scraper 7 is maintained or reset to the normal scraping position under the action of the magnetic spring 10. At this time, the elliptical rod 91 rotates to the squeezing phase, so that the suction force is weakened or stopped, in order to prevent the adhesive layer 4 from being damaged due to excessive negative pressure;

[0050] By utilizing the displacement of the scraper 7 and the reset characteristics of the magnetic spring 10, the adaptive adjustment of the adhesive suction force is achieved. When the amount of adhesive on the scraper 7 is small and the resistance is low, the magnetic spring 10 pushes the linkage plate 11 to rotate the elliptical rod 91 to cut off the extrusion phase or reduce the negative pressure suction force. This cleverly avoids the new adhesive on the surface of the coating layer 4 being sucked up or pulled out with destructive marks due to excessive continuous negative pressure. Thus, it perfectly balances efficient adhesive scraping with comprehensive protection of the underlying coating layer 4, significantly improving the surface coating quality of the automotive hood cover.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic adhesive application device for the bonding surface of multi-layer aluminum alloy sheets for automobiles, comprising an adhesive applicator (1) driven by a robotic arm and an adhesive application head (5) installed at the bottom of the adhesive applicator (1), characterized in that: The lower end of the glue applicator (1) is fixedly connected to a glue applicator head (5) for applying glue to the machine cover (3) made of multi-layer aluminum alloy sheet. A scraper (7) is installed on the side corresponding to the direction of travel of the glue applicator head (5). A negative pressure collection box (6) is connected to the upper end of the scraper (7) through a glue extraction pipe (8). A suction control unit (9) is installed on one side of the middle of the glue extraction pipe (8). The suction control unit (9) is controlled by the floating of the magnetic spring (10) and the scraper (7); The suction control unit (9) includes an elliptical rod (91), a through-rotating shaft (92) is fixedly connected in the middle of the elliptical rod (91), and side plates (94) are rotatably connected to the outer sides of both ends of the rotating shaft (92). Gears (93) are fixedly connected to both ends of the rotating shaft (92), and the upper end of the gear (93) meshes with the teeth (96) provided at the lower end of the guide plate (95). The end of the guide plate (95) away from the tooth (96) is fixedly connected to the movable guide shaft of the magnetic spring (10) via the linkage plate (11), and the other side of the movable guide shaft of the magnetic spring (10) is fixedly connected to the scraper (7).

2. The automatic adhesive application device for the bonding surface of multi-layer aluminum alloy sheets for automobiles according to claim 1, characterized in that: The glue applicator (5) is used to apply the glue layer (4) to the edge surface of the multi-layer aluminum alloy sheet machine cover (3), and the glue applicator (5) is located at the upper end of the multi-layer aluminum alloy sheet machine cover (3).

3. The automatic adhesive application device for the bonding surface of multi-layer aluminum alloy sheets for automobiles according to claim 1, characterized in that: The glue applicator (1) is fixedly connected to a scraper positioning unit (2) by bolts on one side. The scraper positioning unit (2) includes a positioning plate (21). The inner end of the positioning plate (21) is provided with a pipe through hole (22) for positioning the glue extraction tube (8) and a guide hole (23) for positioning the guide plate (95). The bottom end of the positioning plate (21) is provided with a mounting hole (24) for positioning the magnetic spring (10).

4. The automatic adhesive application device for the bonding surface of multi-layer aluminum alloy sheets for automobiles according to claim 1, characterized in that: The negative pressure collection box (6) is fixedly connected to the end of the positioning plate (21) away from the glue applicator (1), and the glue inlet of the negative pressure collection box (6) is fixedly connected to the top of the glue extraction tube (8).

5. The automatic adhesive application device for the bonding surface of multi-layer aluminum alloy sheets for automobiles according to claim 1, characterized in that: The scraper (7) includes a plate body (71), and the plate body (71) has a flow channel (72) arranged in a J-shape corresponding to the glue extraction tube (8) inside. The lower end of the plate body (71) has a glue collection groove (74), and both ends of the glue collection groove (74) have glue blocking grooves (73). The upper end of the glue collection groove (74) is fixedly connected to a glue blocking plate (75).

6. The automatic adhesive application device for the bonding surface of multi-layer aluminum alloy sheets for automobiles according to claim 5, characterized in that: The flow channel (72) is provided in multiple ways. The flow channel (72) corresponds one-to-one with the glue extraction tube (8). The flow channels (72) at both ends are connected to the glue blocking groove (73). The opening of the flow channel (72) is located at the lower end of the glue collection groove (74).

7. The automatic adhesive application device for the bonding surface of multi-layer aluminum alloy sheets for automobiles according to claim 1, characterized in that: The glue extraction tube (8) includes two sections of rigid tube (81). One section of the rigid tube (81) passes through the positioning plate (21) and is connected to the negative pressure collection box (6). The other section of the rigid tube (81) is connected to the flow channel (72). The two sections of the rigid tube (81) are connected by a flexible tube (82). The end of the flexible tube (82) is connected to the positioning plate (21) by a snap fastener. The middle part of the flexible tube (82) is located on one side of the elliptical rod (91).

8. The automatic adhesive application device for the bonding surface of multi-layer aluminum alloy sheets for automobiles according to claim 1, characterized in that: The elliptical rod (91) is in close contact with the hose (82) at the middle position. The side plate (94) is fixedly connected to the positioning plate (21). The guide plate (95) is slidably connected to the positioning plate (21) through the guide hole (23). There are two guide plates (95), and the two guide plates (95) are parallel to each other.

9. The automatic adhesive application device for the bonding surface of multi-layer aluminum alloy sheets for automobiles according to claim 1, characterized in that: The magnetic spring (10) includes a fixed housing for connection with the mounting hole (24) and a movable guide shaft for connection with the scraper (7) and the linkage plate (11).

10. The automatic adhesive application method for the bonding surface of multi-layer aluminum alloy sheets for automobiles according to claim 1, characterized in that: Includes the following steps: Step 1: Drive the robotic arm to drive the glue applicator (1), so that the glue applicator head (5) moves along the edge of the multi-layer aluminum alloy sheet machine cover (3) and coats the upper surface of the machine cover (3) with a glue layer (4). Step 2: While the glue applicator (5) is applying glue, the scraper (7) located on the side corresponding to its direction of travel is pressed against and scraped flat on the surface of the glue layer (4) under the elastic action of the magnetic spring (10). The excess glue collected by the scraper (7) is collected through the glue collection groove (74), glue blocking groove (73) and flow channel (72) connected inside. Step 3: When too much adhesive adheres to the surface of the scraper (7) and generates significant resistance, the scraper (7) moves as a whole towards the positioning plate (21) under the action of resistance, and drives the linkage plate (11) fixedly connected to it to move synchronously; the linkage plate (11) pulls the guide plate (95) to slide along the guide hole (23), and the teeth (96) set at the lower end of the guide plate (95) drive the gear (93) to rotate, and the gear (93) drives the elliptical rod (91) to rotate synchronously through the rotating shaft (92); During the rotation of the round rod (91), the degree of squeezing on the hose (82) is changed based on the eccentric characteristics of its elliptical cross section, thereby automatically adjusting the suction force in the glue extraction tube (8). When the amount of glue attached to the surface of the scraper (7) is small and the resistance is small, the scraper (7) is maintained or reset to the normal glue scraping working position under the action of the magnetic spring (10). At this time, the elliptical rod (91) rotates to the squeezing phase, so that the suction force is weakened or stopped, in order to prevent the glue coating layer (4) from being damaged due to excessive negative pressure.

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