Hot melt adhesive scratch-free coating die head

Abstract

The invention discloses a hot melt adhesive scratch-free coating die head and belongs to the technical field of coating equipment, a runner is arranged at the top end of a lower die, the lower die comprises a main body, an opening block, an adjusting part and a plurality of adjusting mechanisms, the adjusting part is composed of a first connecting block, a first connecting plate and a second connecting block which are sequentially connected, the first connecting block is connected with the lower die main body, and the second connecting block is connected with the second connecting plate. The second connecting block is detachably connected with the lower die orifice block, and the adjusting mechanism can drive the adjusting part to be bent at the first connecting plate. And the two fixing seats are fixedly connected with the lower die, and the lower die is positioned between the two fixing seats. The upper die is arranged above the lower die and connected with the fixed seat through a rotating shaft, the upper die is provided with a feed port, and the bottom end of the upper die is communicated with the runner during die assembly. And the coating roller is arranged at the discharge hole, is separated from the lower die orifice block to form the discharge hole, and is driven to rotate by a driving device fixedly connected with the lower die. Through the arrangement of the adjusting part and the adjusting mechanism, the adjusting part can be driven to be bent, the lower die orifice block is driven to move relative to the lower die main body, and then accurate adjustment of the size of the die orifice is achieved so as to meet various coating requirements.

Description

Technical Field

[0001] The invention relates to the technical field of coating equipment, in particular to a hot melt adhesive scratch-free coating die head. Background Art

[0002] In the field of hot melt adhesive coating technology, the coating die plays a vital role. The existing hot melt adhesive coating die is provided with a coating roller at the die opening. This structural design results in the size of the die opening being usually fixed and cannot be flexibly adjusted according to actual coating needs. In many industrial production and related application scenarios, different products, materials or processes may have diverse requirements for the coating thickness, coating width, etc. of the hot melt adhesive. However, since the existing coating die opening cannot be adjusted, when faced with different coating requirements, it is often difficult to accurately control the coating amount and coating range of the hot melt adhesive, which greatly limits its effective application under various complex working conditions, brings many inconveniences to the production process, reduces the controllability of production efficiency and product quality, and cannot well meet the increasingly diversified and refined needs of modern industrial production for hot melt adhesive coating processes. Summary of the invention

[0003] The purpose of the present invention is to provide a hot melt adhesive scratch-free coating die head to solve the problems existing in the above-mentioned prior art, facilitate the adjustment of the size of the die opening, and improve the applicability of the coating die head.

[0004] To achieve the above object, the present invention provides the following solutions: The present invention provides a hot melt adhesive scratch-free coating die head, comprising: A lower mold, wherein a flow channel is arranged at the top of the lower mold; the lower mold comprises a lower mold body, a lower mold mouth block, an adjustment portion and a plurality of adjustment mechanisms, the adjustment portion comprises a first connecting block, a first connecting plate and a second connecting block connected in sequence, the first connecting block is fixedly connected to the lower mold body, and the second connecting block is detachably connected to the lower mold mouth block; the adjustment mechanism is used to drive the adjustment portion to bend at the first connecting plate; Two fixing seats respectively connected to the lower mold, the lower mold is located between the two fixing seats; An upper die, the upper die is located above the lower die, and each of the fixing seats is rotatably connected to the upper die via a rotating shaft; a feed port is provided on the upper die, and after the upper die and the lower die are closed, the bottom end of the feed port is communicated with the flow channel; A coating roller, wherein the coating roller is arranged at the discharge port of the coating die head, and the interval between the coating roller and the lower die block is the discharge port; A driving device is fixedly connected to the lower mold and is used to drive the coating roller to rotate.

[0005] Preferably, it also includes a rigid pad, which is used to be clamped between the upper mold and the lower mold, and the first end of the pad is clamped between the coating roller and the lower mold block; the first end of the pad is provided with a discharge trough, the thickness of the pad is determined according to the required coating thickness, and the length of the discharge trough is determined according to the required coating width.

[0006] Preferably, a support surface is provided at the top end of the lower mold corresponding to the pad, at least two positioning columns are provided on the support surface, and positioning holes corresponding to the positioning columns one by one are provided on the pad, and the positioning columns are used to be inserted into the corresponding positioning holes.

[0007] Preferably, the upper die is provided with a plurality of first threaded holes, the pad is provided with second threaded holes corresponding one-to-one to the first threaded holes, and the lower die is provided with third threaded holes corresponding one-to-one to the second threaded holes; the first threaded hole and the corresponding second threaded hole and the corresponding third threaded hole are connected with the same bolt.

[0008] Preferably, each of the adjusting mechanisms comprises a first adjusting bolt, a first fixed block, a movable rod and a hook block, a mounting bracket is fixedly provided on the lower die, the first adjusting bolt passes through the first fixed block and is threadedly connected to the first fixed block, the first fixed block is circumferentially and axially limited in the mounting bracket, the movable rod is circumferentially clamped with the mounting bracket, and the movable rod slides with the lower die along the axial direction of the movable rod; a first section of thread and a second section of thread are provided on the first adjusting bolt, the first adjusting bolt passes through the first fixed block and is threadedly connected to the first fixed block through the first section of thread, the first adjusting bolt is threadedly connected to the movable rod through the second section of thread, and the pitch of the first section of thread is greater than the pitch of the second section of thread; the hook block is fixedly connected to the movable rod, a slot is provided on the second connecting block, and a hook tooth on the hook block is clamped with the slot.

[0009] Preferably, a plurality of the adjustment mechanisms are distributed in parallel and at intervals; and the axial direction of the moving rod is perpendicular to the axial direction of the coating roller.

[0010] Preferably, the upper mold includes an upper mold body and an upper mold opening block detachably connected to the upper mold body, the upper mold opening block is provided with an avoidance groove corresponding to the coating roller, and the coating roller is partially located in the avoidance groove; the hardness of the upper mold opening block is greater than the hardness of the upper mold body; the hardness of the lower mold opening block is greater than the hardness of the lower mold body.

[0011] Preferably, the upper mold body is further provided with a plurality of flow resistance adjustment mechanisms, and all of the flow resistance adjustment mechanisms are arranged in sequence along the width direction of the upper mold body; Each of the flow control adjustment mechanisms includes a second adjusting bolt, a second fixed block, a third fixed block, a connecting rod and a flow control block. The second fixed block, the third fixed block, the connecting rod and the flow control block are arranged in sequence from top to bottom. The second fixed block and the third fixed block are respectively fixedly connected to the upper mold body, the connecting rod and the flow control block are respectively slidably matched with the upper mold body in the vertical direction, and the flow control block is circumferentially limited with the upper mold body; a third section of thread and a fourth section of thread are provided on the second adjusting bolt, the second adjusting bolt passes through the second fixed block, the second adjusting bolt is threadedly connected to the third fixed block through the third section of thread, the second adjusting bolt is threadedly connected to the connecting rod through the fourth section of thread, and the pitch of the third section of thread is greater than the pitch of the fourth section of thread.

[0012] Preferably, it also includes two side plates, one of which is fixed on one side of the lower mold and the other is fixed on the other side of the lower mold, the top of each side plate is higher than the top of the lower mold, and the side plate is used to close the side of the flow channel; the driving device is fixedly connected to one of the side plates through a second connecting plate.

[0013] Preferably, the thickness of the first connecting plate is 6 mm.

[0014] Compared with the prior art, the present invention has achieved the following technical effects: The hot melt adhesive scratch-free coating die head of the present invention is provided with an adjustment part and a plurality of adjustment mechanisms, which can drive the adjustment part to bend at the first connecting plate, thereby driving the lower die block to move relative to the lower die body, and realizing precise adjustment of the die size. This can effectively meet the diverse requirements of different products, materials or processes for the hot melt adhesive coating thickness, coating width, etc., greatly improve the applicability of the coating die head under various complex working conditions, and overcome the limitations brought about by the fixed die of the existing coating die head.

[0015] Furthermore, since the die size can be flexibly adjusted, the coating amount and coating range of the hot melt adhesive can be accurately controlled according to actual needs, thereby significantly improving the coating accuracy, helping to improve the controllability of product quality, making the products produced more in line with high standards in hot melt adhesive coating, and reducing product defects caused by inaccurate coating amount. No longer limited to a single die size, it can quickly adapt to different coating tasks, reducing the time spent on replacing different specifications of coating dies or complex modifications to existing dies, thereby effectively improving the overall efficiency of the production process, making the industrial production process smoother and more efficient, and reducing production costs.

[0016] Furthermore, a rigid pad is provided between the upper die and the lower die, and the first end of the pad is provided between the coating roller and the lower die block. The coating thickness and width are controlled by reasonably determining the thickness of the pad and the length of the discharge trough, thereby effectively avoiding the generation of scratches during the coating process, ensuring the flatness and quality of the coating surface, and improving the appearance quality and performance of the product.

[0017] Furthermore, multiple adjustment mechanisms are distributed in parallel and at intervals, and the axis of the moving rod is perpendicular to the axis of the coating roller, so that the force during the adjustment process is uniform and stable; the structural design of the upper mold and the lower mold and the connection method between the various components, such as the rotational connection between the upper mold and the lower mold through a fixed seat and a rotating shaft, and the side plate closing the side of the flow channel, all make the entire coating die head structure firm and stable, ensuring reliability and durability during long-term use, reducing equipment failures and maintenance costs, and facilitating the continuous and stable progress of industrial production.

[0018] Furthermore, setting the hardness of the upper die block and the lower die block to be harder can reduce the wear rate of the upper die block and the lower die block. In addition, the upper die block and the lower die block can be disassembled and replaced, which is convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a hot melt adhesive scratch-free coating die head of the present invention; Figure 2 It is a partial structural schematic diagram of the hot melt adhesive scratch-free coating die head of the present invention; Figure 3 The structure of the hot melt adhesive scratch-free coating die head of the present invention is shown in the upper mold open state Figure 1 ; Figure 4 The structure of the hot melt adhesive scratch-free coating die head of the present invention is shown in the upper mold open state Figure 2 ; In the figure: 1. upper mold body; 2. lower mold body; 3. fixed seat; 4. rotating shaft; 6. side plate; 7. coating roller; 8. driving device; 9. second connecting plate; 10. upper mold mouth block; 11. lower mold mouth block; 12. flow channel; 13. first adjusting bolt; 14. first fixed block; 15. mounting frame; 16. moving rod; 17. hook block; 18. hook tooth; 19. slot; 20. flow blocking block; 21. connecting rod; 22. third fixed block; 23. second fixed block; 24. second adjusting bolt; 25. feed port; 26. pad; 27. discharge chute; 28. positioning hole; 29. ​​positioning column; 30. second threaded hole; 31. first threaded hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a hot melt adhesive scratch-free coating die head to solve the problems existing in the above-mentioned prior art, facilitate the adjustment of the size of the die opening, and improve the applicability of the coating die head.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figures 1 to 4 As shown, this embodiment provides a hot melt adhesive scratch-free coating die head, comprising: The lower mold is provided with a flow channel 12 at the top of the lower mold; the lower mold comprises a lower mold body 2, a lower mold mouth block 11, an adjustment part and a plurality of adjustment mechanisms, the adjustment part comprises a first connection block, a first connection plate and a second connection block connected in sequence, the first connection block is fixedly connected to the lower mold body 2, and the second connection block is detachably connected to the lower mold mouth block 11; the adjustment mechanism is used to drive the adjustment part to bend at the first connection plate; Two fixing seats 3 respectively connected to the lower mold, and the lower mold is located between the two fixing seats 3; The upper mold is located above the lower mold, and each fixed seat 3 is rotatably connected to the upper mold through a rotating shaft 4; a feed port 25 is provided on the upper mold, and after the upper mold and the lower mold are closed, the bottom end of the feed port 25 is connected to the flow channel 12; Coating roller 7, which is arranged at the discharge port of the coating die head, and the interval between the coating roller 7 and the lower die block 11 is the discharge port; The driving device 8 is fixedly connected to the lower mold and is used to drive the coating roller 7 to rotate. During the coating process, the driving device 8 provides power to make the coating roller 7 rotate continuously around its own axis. After the hot melt adhesive flows out from the discharge port, the rotation of the coating roller 7 can evenly coat the hot melt adhesive on the surface of the material to be coated.

[0025] In the optional scheme of this embodiment, it is more preferred to further include a rigid pad 26, the pad 26 is used to be clamped between the upper die and the lower die, and the first end of the pad 26 is clamped between the coating roller 7 and the lower die block 11; the first end of the pad 26 is provided with a discharge groove 27, the thickness of the pad 26 is determined according to the required coating thickness, and the length and specific shape of the discharge groove 27 are determined according to the required coating width and the specific coating style, such as Figure 3 and Figure 4 Two different styles of pads 26 are shown in FIG. During the coating process, when the hot melt adhesive flows from the flow channel 12 to the discharge port, it passes through the gap between the pad 26 and the lower die block 11 and the coating roller 7. The thickness of the pad 26 limits the passage space of the hot melt adhesive in the vertical direction, thereby achieving precise control of the coating thickness. A discharge trough 27 is provided at the first end of the pad 26, and the length of the discharge trough 27 is determined according to the required coating width. After the hot melt adhesive flows out of the discharge port, it can only flow to the coating roller 7 through the discharge trough 27. The length of the discharge trough 27 limits the coating range of the hot melt adhesive in the horizontal direction, thereby achieving effective control of the coating width.

[0026] In the optional scheme of this embodiment, it is more preferred that a support surface is provided at the top end of the lower mold corresponding to the pad 26, at least two positioning columns 29 are provided on the support surface, and positioning holes 28 corresponding to the positioning columns 29 are provided on the pad 26, and the positioning columns 29 are used to pass through the corresponding positioning holes 28; through this positioning method, the accurate position of the pad 26 during the installation process is ensured, and the pad 26 is prevented from being displaced during the coating process, which affects the control effect of the coating thickness and width.

[0027] In the optional scheme of this embodiment, it is more preferred that a plurality of first threaded holes 31 are provided on the upper die, a second threaded hole 30 corresponding to the first threaded hole 31 is provided on the backing plate 26, and a third threaded hole corresponding to the second threaded hole 30 is provided on the lower die; the first threaded hole 31 is connected with the corresponding second threaded hole 30 and the corresponding third threaded hole by the same bolt. The same bolt passes through the corresponding first threaded hole 31, the second threaded hole 30, and the third threaded hole, thereby ensuring the tightness and stability of the connection between the three.

[0028] In the optional scheme of the present embodiment, it is more preferred that each adjustment mechanism includes a first adjusting bolt 13, a first fixed block 14, a moving rod 16 and a hook block 17, a mounting frame 15 is fixedly provided on the lower mold, the first adjusting bolt 13 passes through the first fixed block 14 and is threadedly connected with the first fixed block 14, the first fixed block 14 is circumferentially and axially limited in the mounting frame 15, the moving rod 16 is circumferentially clamped with the mounting frame 15, and the moving rod 16 slides with the lower mold along the axial direction of the moving rod 16; a first section of thread and a second section of thread are provided on the first adjusting bolt 13, the first adjusting bolt 13 passes through the first fixed block 14 and is threadedly connected with the first fixed block 14 through the first section of thread, the first adjusting bolt 13 is threadedly connected with the moving rod 16 through the second section of thread, the pitch of the first section of thread is greater than the pitch of the second section of thread, and the direction of the first section of thread is the same as that of the second section of thread; the hook block 17 is fixedly connected to the moving rod 16, a slot 19 is provided on the second connecting block, and the hook teeth 18 on the hook block 17 are clamped with the slot 19. It is worth noting that by making the pitch of the first section of the thread greater than the pitch of the second section of the thread, the moving rod 16 can be moved more accurately when the first adjusting bolt 13 is turned. For example, if the pitch of the first section is 1.3 mm and the pitch of the second section is 1 mm, the moving rod 16 moves a distance of 0.3 mm when the first adjusting bolt 13 rotates one circle.

[0029] In the optional solution of this embodiment, it is more preferred that multiple adjustment mechanisms are distributed in parallel and at intervals, and the axial direction of the moving rod 16 is perpendicular to the axial direction of the coating roller 7. This distribution method enables each adjustment mechanism to coordinately and evenly apply force to the adjustment part when adjusting the size of the die opening, ensuring the stability and accuracy of the adjustment process, and avoiding problems such as irregular deformation of the die opening caused by uneven local force.

[0030] In the optional scheme of the present embodiment, it is more preferred that the upper mold includes an upper mold body 1 and an upper mold block 10 detachably connected to the upper mold body 1, and the upper mold block 10 is provided with an avoidance groove corresponding to the coating roller 7, and the coating roller 7 is partially located in the avoidance groove. Such a design not only facilitates the installation and positioning of the coating roller 7, but also enables it to maintain a relatively stable position during operation; the hardness of the upper mold block 10 is greater than the hardness of the upper mold body 1, and the hardness of the lower mold block 11 is greater than the hardness of the lower mold body 2.

[0031] In the optional scheme of this embodiment, it is more preferred that the upper mold body 1 is further provided with a plurality of flow resistance adjustment mechanisms, and all the flow resistance adjustment mechanisms are arranged in sequence along the width direction of the upper mold body 1; Each flow control mechanism includes a second adjusting bolt 24, a second fixed block 23, a third fixed block 22, a connecting rod 21 and a flow control block 20. The second fixed block 23, the third fixed block 22, the connecting rod 21 and the flow control block 20 are arranged in sequence from top to bottom. The second fixed block 23 and the third fixed block 22 are respectively fixedly connected to the upper mold body 1, the connecting rod 21 and the flow control block 20 are respectively slidably matched with the upper mold body 1 in the vertical direction, and the flow control block 20 is circumferentially limited with the upper mold body 1; the second adjusting bolt 24 is provided with a third section of thread and a fourth section of thread, the second adjusting bolt 24 passes through the second fixed block 23, the second adjusting bolt 24 is threadedly connected to the third fixed block 22 through the third section of thread, the second adjusting bolt 24 is threadedly connected to the connecting rod 21 through the fourth section of thread, and the pitch of the third section of thread is greater than the pitch of the fourth section of thread. The bottom end of the baffle block 20 is located in the flow channel 12. By rotating the second adjusting bolt 24, the baffle block 20 can be driven to rise and fall, and the thickness of the flow channel 12 can be adjusted, thereby adjusting the flow rate of the material. By adjusting the height of the baffle block 20 in different baffle adjustment mechanisms, the flow rate of the material at different horizontal positions in the flow channel can be adjusted, so as to make the flow rate of the material at each location consistent and improve the uniformity of material distribution.

[0032] In the optional scheme of this embodiment, it is more preferred to further include two side plates 6, one side plate 6 is fixedly arranged on one side of the lower mold, and the other side plate 6 is fixedly arranged on the other side of the lower mold, the top of each side plate 6 is higher than the top of the lower mold, and the side plates 6 are used to close the side of the flow channel 12; the driving device 8 is fixedly connected to one of the side plates 6 through the second connecting plate 9. This can prevent the hot melt adhesive from leaking from the side when flowing in the flow channel 12, ensure the normal transportation of the hot melt adhesive in the flow channel 12, and also help maintain the integrity and stability of the entire coating die structure.

[0033] In the optional solution of this embodiment, more preferably, the thickness of the first connecting plate is 6 mm.

[0034] The working principle of the hot melt adhesive scratch-free coating die head of this embodiment is as follows: Before coating, first determine the required coating width and coating thickness, then select the corresponding pad 26, then flip the upper mold open, place the required pad 26 on the lower mold, then rotate the upper mold to close the mold, then connect the corresponding first threaded hole 31, second threaded hole 30, and third threaded hole with the same bolt, and then let the hot melt adhesive enter the coating die head from the external supply system through the feed port 25 set on the upper mold. When the upper mold and the lower mold are closed, the bottom end of the feed port 25 is connected to the flow channel 12 set at the top of the lower mold, so that the hot melt adhesive can flow smoothly into the flow channel 12 and be transmitted in the flow channel 12, preparing for the subsequent coating process. When the die size needs to be adjusted, by rotating the first adjusting bolt 13, since the first adjusting bolt 13 is threadedly connected to the first fixing block 14 and the first fixing block 14 is limited, the rotation of the first adjusting bolt 13 will be converted into axial movement, thereby pushing the moving rod 16 to slide along its axial direction. The moving rod 16 drives the hook block 17 to move, and the hook block 17 pulls the second connecting block through the clamping relationship with the clamping groove 19 on the second connecting block, so that the adjustment part is bent at the first connecting plate. Since the second connecting block is connected to the lower die block 11, the position of the lower die block 11 relative to the lower die body 2 is changed, so as to achieve the purpose of adjusting the die size.

[0035] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hot melt adhesive scratch-free coating die head, characterized in that: include: A lower mold, wherein a flow channel is arranged at the top of the lower mold; the lower mold comprises a lower mold body, a lower mold mouth block, an adjustment portion and a plurality of adjustment mechanisms, the adjustment portion comprises a first connecting block, a first connecting plate and a second connecting block connected in sequence, the first connecting block is fixedly connected to the lower mold body, and the second connecting block is detachably connected to the lower mold mouth block; the adjustment mechanism is used to drive the adjustment portion to bend at the first connecting plate; Two fixing seats respectively connected to the lower mold, the lower mold is located between the two fixing seats; An upper die, the upper die is located above the lower die, and each of the fixing seats is rotatably connected to the upper die via a rotating shaft; a feed port is provided on the upper die, and after the upper die and the lower die are closed, the bottom end of the feed port is communicated with the flow channel; A coating roller, wherein the coating roller is arranged at the discharge port of the coating die head, and the interval between the coating roller and the lower die block is the discharge port; A driving device is fixedly connected to the lower mold and is used to drive the coating roller to rotate.

2. The hot melt adhesive scratch-free coating die head according to claim 1, characterized in that: It also includes a rigid pad, which is used to be clamped between the upper mold and the lower mold, and the first end of the pad is clamped between the coating roller and the lower mold block; the first end of the pad is provided with a discharge trough, the thickness of the pad is determined according to the required coating thickness, and the length of the discharge trough is determined according to the required coating width.

3. The hot melt adhesive scratch-free coating die head according to claim 2, characterized in that: A support surface is provided at the top end of the lower mold corresponding to the pad, at least two positioning columns are provided on the support surface, and positioning holes corresponding to the positioning columns are provided on the pad, and the positioning columns are used to penetrate into the corresponding positioning holes.

4. The hot melt adhesive scratch-free coating die head according to claim 2, characterized in that: The upper die is provided with a plurality of first threaded holes, the pad is provided with second threaded holes corresponding one-to-one to the first threaded holes, and the lower die is provided with third threaded holes corresponding one-to-one to the second threaded holes; the first threaded holes and the corresponding second threaded holes and the corresponding third threaded holes are connected with the same bolt.

5. The hot melt adhesive scratch-free coating die head according to claim 1, characterized in that: Each of the adjusting mechanisms includes a first adjusting bolt, a first fixed block, a moving rod and a hook block, a mounting bracket is fixedly provided on the lower mold, the first adjusting bolt passes through the first fixed block and is threadedly connected to the first fixed block, the first fixed block is circumferentially and axially limited in the mounting bracket, the moving rod is circumferentially clamped with the mounting bracket, and the moving rod slides with the lower mold along the axial direction of the moving rod; a first section of thread and a second section of thread are provided on the first adjusting bolt, the first adjusting bolt passes through the first fixed block and is threadedly connected to the first fixed block through the first section of thread, the first adjusting bolt is threadedly connected to the moving rod through the second section of thread, and the pitch of the first section of thread is greater than the pitch of the second section of thread; the hook block is fixedly connected to the moving rod, a slot is provided on the second connecting block, and a hook tooth on the hook block is clamped with the slot.

6. The hot melt adhesive scratch-free coating die head according to claim 5, characterized in that: The plurality of adjusting mechanisms are distributed in parallel and at intervals; and the axial direction of the moving rod is perpendicular to the axial direction of the coating roller.

7. The hot melt adhesive scratch-free coating die head according to claim 1, characterized in that: The upper mold includes an upper mold body and an upper mold opening block detachably connected to the upper mold body, the upper mold opening block is provided with an avoidance groove corresponding to the coating roller, and the coating roller is partially located in the avoidance groove; the hardness of the upper mold opening block is greater than the hardness of the upper mold body; the hardness of the lower mold opening block is greater than the hardness of the lower mold body.

8. The hot melt adhesive scratch-free coating die head according to claim 7, characterized in that: The upper mold body is also provided with a plurality of flow resistance adjustment mechanisms, and all of the flow resistance adjustment mechanisms are arranged in sequence along the width direction of the upper mold body; Each of the flow control adjustment mechanisms includes a second adjusting bolt, a second fixed block, a third fixed block, a connecting rod and a flow control block. The second fixed block, the third fixed block, the connecting rod and the flow control block are arranged in sequence from top to bottom. The second fixed block and the third fixed block are respectively fixedly connected to the upper mold body, the connecting rod and the flow control block are respectively slidably matched with the upper mold body in the vertical direction, and the flow control block is circumferentially limited with the upper mold body; a third section of thread and a fourth section of thread are provided on the second adjusting bolt, the second adjusting bolt passes through the second fixed block, the second adjusting bolt is threadedly connected to the third fixed block through the third section of thread, the second adjusting bolt is threadedly connected to the connecting rod through the fourth section of thread, and the pitch of the third section of thread is greater than the pitch of the fourth section of thread.

9. The hot melt adhesive scratch-free coating die head according to claim 1, characterized in that: It also includes two side plates, one of which is fixed on one side of the lower mold and the other side of the lower mold, and the top of each side plate is higher than the top of the lower mold, and the side plates are used to close the side of the flow channel; the driving device is fixedly connected to one of the side plates through a second connecting plate.

10. The hot melt adhesive scratch-free coating die head according to claim 1, characterized in that: The thickness of the first connecting plate is 6 mm.

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