An extrusion coater coating die structure

Abstract

This utility model discloses a coating die head structure for an extrusion coating machine, comprising: an upper die; a lower die, the lower die being connected to the upper die via a connector, the lower die having at least one set of cavities for placing slurry; a diaphragm, the edge region of which forms a circumferential fixing area fixedly connected to the upper die, and the central region of the diaphragm forming a central contact area contacting the upper die; and an adjusting member disposed within the upper die, the end of which passes through the upper die and maintains contact with the central contact area of ​​the diaphragm. This utility model has a simple structure. Under the action of the diaphragm, during the adjustment of the die gap, rotating the micrometer knob causes the T-blocks to move towards the diaphragm, forcing the central contact area of ​​the diaphragm to deform, thus creating an arc-shaped surface in the central contact area of ​​the diaphragm. This reduces the resistance of the slurry inside the die cavity, thereby improving the uniformity of the coating surface density and reducing the impact of height differences between the T-blocks on the slurry flow rate during roller gap adjustment.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery manufacturing technology, specifically a coating die head structure for an extrusion coating machine. Background Technology

[0002] In the lithium battery coating industry, in the front-end process, after the raw materials undergo a slurry mixing process, a slurry with a certain viscosity needs to be applied to copper or aluminum foil at a certain thickness. This is called the coating process. The density per unit area of ​​the electrode sheet is called the coating surface density. As an important parameter affecting battery quality and performance, ensuring the lateral consistency of the coating surface density not only improves the pass rate of subsequent processes but also improves battery quality and performance. Currently, the industry mainly optimizes the surface density distribution by adjusting parameters such as slurry viscosity, screw pump delivery rate, and mold cavity pressure. However, for narrow-width coating scenarios, the precise adjustment of the mold gap (mold seam) has become a key bottleneck restricting the consistency of surface density.

[0003] In existing technologies, die gap adjustment commonly employs a segmented T-block independent height adjustment structure, achieving slurry flow control through local fine-tuning. However, due to the lack of a dynamic coordination mechanism between adjacent T-blocks, differential adjustment leads to a stepped height difference between adjacent blocks. This height difference not only causes discontinuous flow channel abrupt changes within the die cavity but also triggers local resistance imbalances in the slurry flow rate, resulting in distorted slurry flow distribution in the transverse direction. Ultimately, this leads to periodic or regional fluctuations in the coating surface density. Especially under high-solids-content slurries or ultra-thin coating conditions, this fluid disturbance effect caused by die gap height differences is more significant, severely weakening the stability of the coating process. To address this, a coating die head structure for an extrusion coating machine is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a coating die head structure for an extrusion coating machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a coating die head structure for an extrusion coating machine, comprising:

[0006] upper mold;

[0007] The lower mold is connected to the upper mold by a connector, and the lower mold has at least one set of mold cavities for placing slurry.

[0008] The diaphragm has a circumferential fixing area formed on its periphery that is fixedly connected to the upper mold, and a central contact area formed in the middle of the diaphragm that is in contact with the upper mold.

[0009] An adjusting member is disposed within the upper mold. The end of the adjusting member passes through the upper mold and remains in contact with the center contact area of ​​the diaphragm. When the adjusting member moves toward the diaphragm, the end of the adjusting member forces the center contact area of ​​the diaphragm to deform, so that the center contact area of ​​the diaphragm produces an arc-shaped surface.

[0010] As a further embodiment of this utility model: the adjusting component includes a micrometer knob disposed in the upper mold, the end of the micrometer knob located in the upper mold being rotatably connected to the T-block, and the end of the T-block away from the micrometer knob maintaining contact with the central contact area of ​​the diaphragm.

[0011] During the adjustment of the mold gap, the corresponding micrometer knob on the upper mold can be rotated clockwise or counterclockwise. As the micrometer knob rotates, it moves forward or backward under the action of the internal and external threads. At this time, the T-block connected to the micrometer knob will also move along with it, but will not rotate. When the T-block moves towards the diaphragm, it will force the central contact area of ​​the diaphragm to deform, so that the central contact area of ​​the diaphragm will produce an arc-shaped surface, reducing the resistance of the slurry inside the mold cavity, thereby improving the uniformity of the coating surface density.

[0012] As a further embodiment of this utility model: the number of mold cavities is two sets, both sets of mold cavities are opened on the contact surface between the lower mold and the upper mold, and both sets of mold cavities are provided with rotating rods.

[0013] By installing rotating rods in both mold cavities, the flow of slurry within the mold cavities can be ensured at all times, preventing slurry deposition within the mold cavities.

[0014] As a further embodiment of this utility model: the outer circumferential surface of the rotating rod is provided with bidirectional helical blades, the bidirectional helical blades being arranged in opposite directions with the midpoint of the central axis of the rotating rod as a reference.

[0015] By using bidirectional spiral blades arranged in opposite directions, the slurry located on both sides of the mold cavity can be effectively driven to flow, avoiding slurry deposition on both sides that would affect the flow of the internal slurry and thus affect the coating density.

[0016] As a further embodiment of this utility model: one end of each of the two rotating rods passes through the lower mold and is connected to the driving component, for driving the bidirectional spiral blades to stir the slurry located in the mold cavity.

[0017] As a further embodiment of this utility model, a protective cover is installed on the surface of the lower mold to cover the driving component, which can better protect the driving component from external influences during transmission.

[0018] As a further aspect of this utility model, the surface of the protective cover has an opening. This design ensures that the heat generated by the drive component during operation can be effectively dissipated, preventing heat from accumulating inside the protective cover.

[0019] As a further embodiment of this utility model: the driving component includes:

[0020] Electric motor;

[0021] The worm gear is connected to the output end of the motor at one end and to the lower mold at the other end through a fixing component, so that the motor can drive the worm gear to rotate.

[0022] The worm gear meshes with the worm and is connected to the end of a rotating rod that passes through the lower die. The worm gear drives a synchronous pulley to rotate via a transmission belt on its outer circumference. The synchronous pulley is connected to the end of another rotating rod that passes through the lower die.

[0023] The worm gear can be driven to rotate by an electric motor, which in turn drives the worm wheel that meshes with it to rotate. The worm wheel, in turn, drives the transmission belt that connects the worm wheel and the synchronous pulley to move. The movement of the transmission belt also drives the synchronous rotation. This allows one motor to drive two bidirectional rotating rods to operate synchronously, promoting the flow of slurry in the two mold cavities.

[0024] As a further embodiment of this invention: the synchronous pulley and the worm gear are both located on the same side of the lower mold. This design facilitates the transmission belt to connect the synchronous pulley and the worm gear together for transmission.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] Under the action of the diaphragm, when the micrometer knob is rotated to move the T-block toward the diaphragm during the adjustment of the die gap, the central contact area of ​​the diaphragm will be deformed, so that the central contact area of ​​the diaphragm will produce an arc-shaped surface, reducing the resistance of the slurry inside the die cavity, thereby improving the uniformity of the coating surface density and reducing the impact of the height difference between the T-blocks on the slurry flow rate when adjusting the roller gap. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the upper and lower mold assembly of this utility model;

[0028] Figure 2 This is a schematic diagram of the interior of the lower mold of this utility model;

[0029] Figure 3 This is a top view of the lower mold of this utility model;

[0030] Figure 4 This is a schematic diagram of the driving component of this utility model;

[0031] Figure 5 This is a schematic diagram of the upper mold of this utility model;

[0032] Figure 6 This is a schematic diagram of the micrometer knob and T-block combination of this utility model;

[0033] Figure 7 This is a schematic diagram of the improved diaphragm of this utility model;

[0034] In the diagram: 1. Upper mold; 2. Lower mold; 3. Connector; 4. Diaphragm; 5. Micrometer knob; 6. T-block; 7. Mold cavity; 8. Rotating rod; 9. Bidirectional helical blade; 10. Drive component; 101. Motor; 102. Worm gear; 103. Fixing component; 104. Worm wheel; 105. Synchronous pulley; 106. Transmission belt; 11. Protective cover. Detailed Implementation

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

[0036] Please see Figure 1-7 In this embodiment of the present invention, a coating die head structure for an extrusion coating machine includes:

[0037] Upper mold 1;

[0038] The lower mold 2 is connected to the upper mold 1 by a connector 3. The lower mold 2 has at least one set of mold cavities 7 for placing slurry.

[0039] The diaphragm 4 has a circumferential fixing area formed around its periphery that is fixedly connected to the upper mold 1, and a central contact area formed in the middle of the diaphragm 4 that is in contact with the upper mold 1.

[0040] An adjusting member is provided inside the upper mold 1. The end of the adjusting member passes through the upper mold 1 and maintains contact with the center contact area of ​​the diaphragm 4. When the adjusting member moves toward the diaphragm 4, the end of the adjusting member will force the center contact area of ​​the diaphragm 4 to deform, so that the center contact area of ​​the diaphragm 4 produces an arc-shaped surface.

[0041] Specifically, the connector 3 is divided into an upper connecting block and a lower connecting block. The upper connecting block and the lower connecting block are rotatably connected. The upper connecting block is connected to the upper mold 1, and the lower connecting block is connected to the lower mold 2. This allows for a better combination into a complete coating die head structure. The mold cavity 7 is located on the end face of the lower mold 2 near the upper mold 1, and the mold cavity 7 is semi-circular, which facilitates the flow of slurry along the arc-shaped inner wall.

[0042] The diaphragm 4 is made of corrosion-resistant materials with a certain degree of elasticity, such as polyurethane and silicone, which allows the diaphragm 4 to be stretched and reset within a certain range. The circumferential fixing area of ​​the diaphragm 4 is used to fix the position of the diaphragm 4 on the upper mold 1, so as to ensure that the diaphragm 4 is always fixed on the upper mold 1 regardless of any deformation. When the center contact area of ​​the diaphragm 4 is pressed by the end of the adjusting member, it will force the center contact area of ​​the diaphragm 4 to deform, thereby forming an arc-shaped surface. When the adjusting member retracts into the upper mold 1, the diaphragm 4 loses the pressure of the adjusting member and will reset under the elastic action of the diaphragm 4. At this time, the center contact area of ​​the diaphragm 4 still maintains contact with the surface of the upper mold 1.

[0043] The adjusting component includes a micrometer knob 5 located inside the upper mold 1. The end of the micrometer knob 5 inside the upper mold 1 is rotatably connected to a T-block 6. The end of the T-block 6 away from the micrometer knob 5 maintains contact with the central contact area of ​​the diaphragm 4. By rotating the micrometer knob 5, the T-block 6 is displaced towards the diaphragm 4, forcing the central contact area of ​​the diaphragm 4 to deform, thereby creating an arc-shaped surface in the central contact area of ​​the diaphragm 4. The upper mold 1 has multiple sets of through holes, each consisting of an internally threaded hole and a sliding groove. The internally threaded hole is connected to the sliding groove. The micrometer knob 5 is used for mounting, and the slide is used for mounting the T-block 6. The micrometer knob 5 can be engaged with the internal threaded hole. By rotating the micrometer knob 5, the distance that the micrometer knob 5 extends into the upper mold 1 can be adjusted. It can be rotated clockwise or counterclockwise to achieve the effect of extending into the upper mold 1. The clockwise or counterclockwise rotation can be determined according to the actual situation. When the end of the micrometer knob 5 extends into the upper mold 1, it will also squeeze the T-block 6 to move along the inside of the slide, and at the same time, squeeze the end of the T-block 6 out of the upper mold 1 and apply pressure to the diaphragm 4.

[0044] Through the above technical solution, during the adjustment of the mold gap, by rotating the corresponding micrometer knob 5 on the upper mold 1, the micrometer knob 5 generates a force that rotates and moves forward. At this time, the T-block 6 connected to the micrometer knob 5 will also move along with it, but will not rotate. When the T-block 6 moves towards the diaphragm 4, it will squeeze the diaphragm 4, forcing the central contact area of ​​the diaphragm 4 to deform, so that the central contact area of ​​the diaphragm 4 produces an arc-shaped surface, thereby reducing the resistance of the slurry inside the mold cavity 7, and thus improving the uniformity of the coating surface density.

[0045] Please see Figure 2 In one embodiment, preferably, there are two sets of mold cavities 7, both sets of mold cavities 7 are opened on the contact surface between the lower mold 2 and the upper mold 1, and both sets of mold cavities 7 are provided with rotating rods 8.

[0046] Specifically, the two mold cavities 7 are the main mold cavity and the secondary mold cavity, respectively. The space inside the main mold cavity is larger than the space inside the secondary mold cavity. The lower mold 2 is also provided with holes for pouring slurry into the main mold cavity. After the slurry enters the main mold cavity through the holes, it then enters the secondary mold cavity from the main mold cavity and is finally used for coating. In both the main mold cavity and the secondary mold cavity, rotating rods 8 are horizontally arranged along their length. This design ensures that the slurry in the main mold cavity and the secondary mold cavity can maintain a certain fluidity. Through the continuous action of the rotating rods 8 and the bidirectional spiral blades 9, not only can the slurry be prevented from depositing in the mold cavity 7, but it can also promote the uniform mixing of the slurry, thereby ensuring coating quality and efficiency.

[0047] Please see Figure 3 In one embodiment, preferably, the outer peripheral surface of the rotating rod 6 is provided with bidirectional spiral blades 9. The bidirectional spiral blades 9 are arranged in opposite directions with the midpoint of the central axis of the rotating rod 8 as a reference. This design allows the slurry inside the mold cavity 7 to be slowly stirred from both sides and gathered to the center when the rotating rod 8 and the bidirectional spiral blades 9 rotate. This process effectively reduces the deposition of slurry on both sides of the mold cavity 7 and ensures the uniform distribution and fluidity of the slurry in the mold cavity 7.

[0048] Please see Figure 2 In one embodiment, preferably, one end of each of the two rotating rods 8 passes through the lower mold 2 and is connected to the driving member 10, for driving the bidirectional spiral blades 9 to stir the slurry located in the mold cavity 7.

[0049] Please see Figure 2 In one embodiment, preferably, a protective cover 11 covering the drive component 10 is installed on the surface of the lower mold 2. The surface of the protective cover 11 has an opening. This design ensures that the heat generated by the drive component 10 during operation can be effectively dissipated, avoiding heat concentration inside the protective cover 11. At the same time, the area of ​​the protective cover 11 other than the opening can also prevent some slurry from splashing directly onto the drive component 10, thereby protecting the drive component 10 from contamination and potential damage.

[0050] Please see Figure 2 In one embodiment, preferably, the driving element 10 includes:

[0051] Motor 101;

[0052] The worm gear 102 is connected at one end to the output end of the motor 101, and at the other end to the lower mold 2 through the fixing part 103, so that the motor 101 can drive the worm gear 102 to rotate.

[0053] The worm gear 104 meshes with the worm 102 and is connected to the end of a rotating rod 8 that passes through the lower mold 2. The synchronous wheel 105 is driven to rotate by the transmission belt 106 on the outer circumference of the worm gear 104. The synchronous wheel 105 is connected to the end of another rotating rod 8 that passes through the lower mold 2.

[0054] Specifically, the motor 101 is mounted on the protective cover 11. The tail of the motor 101 is located outside the protective cover 11, and the head of the motor 101 is located inside the protective cover 11. The tail of the motor 101 is located outside the protective cover 11, which is conducive to heat dissipation when the motor 101 is running.

[0055] One end of the worm gear 102 is fixedly connected to the output end of the motor 101, with the output end located at the head of the motor 101. The other end of the worm gear 102 is rotatably connected to the fixing member 103. The fixing member 103 is fixed on the surface of the lower mold 2. The output end of the motor 101 can drive the worm gear 102 to rotate synchronously. The fixing member 103 and the worm gear 102 are connected by a rotatable connection. This design does not hinder the normal rotation of the worm gear 102, and can effectively limit the position of the worm gear 102.

[0056] Worm gear 104 and synchronous pulley 105 are respectively installed at the ends of the two rotating rods 8 that protrude from the lower mold 2. Both synchronous pulley 105 and worm gear 104 are located on the same side of the lower mold 2. The axis of worm gear 104 and the axis of synchronous pulley 105 are on the same straight line. This design makes it easy to put the transmission belt 106 on the outer circumference of both, thereby effectively connecting the two in series. Worm gear 104 meshes with worm 102. When worm 102 rotates, it can drive worm gear 104 to rotate. The rotating worm gear 104 can drive synchronous pulley 105 to rotate through transmission belt 106. In this way, worm gear 104 and synchronous pulley 105 can drive the rotating rod 8 connected to them to rotate, thus completing the drive of rotating rod 8.

[0057] The above scheme enables the synchronous operation of two rotating rods 8 by driving one motor 101, thereby promoting the flow of slurry in the two mold cavities 7.

[0058] 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. 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.

[0059] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A coating die head structure for an extrusion coating machine, characterized in that, include: upper mold; The lower mold is connected to the upper mold by a connector, and the lower mold has at least one set of mold cavities for placing slurry. The diaphragm has a circumferential fixing area formed on its periphery that is fixedly connected to the upper mold, and a central contact area formed in the middle of the diaphragm that is in contact with the upper mold. An adjusting member is disposed within the upper mold. The end of the adjusting member passes through the upper mold and remains in contact with the center contact area of ​​the diaphragm. When the adjusting member moves toward the diaphragm, the end of the adjusting member forces the center contact area of ​​the diaphragm to deform, so that the center contact area of ​​the diaphragm produces an arc-shaped surface.

2. The coating die head structure of the extrusion coating machine according to claim 1, characterized in that, The adjusting component includes a micrometer knob located inside the upper mold. The end of the micrometer knob inside the upper mold is rotatably connected to a T-block, and the end of the T-block away from the micrometer knob is in contact with the central contact area of ​​the diaphragm.

3. The coating die head structure of the extrusion coating machine according to claim 1, characterized in that, The number of mold cavities is two sets, and both sets of mold cavities are opened on the contact surface between the lower mold and the upper mold. Both sets of mold cavities are equipped with rotating rods.

4. The coating die head structure of the extrusion coating machine according to claim 3, characterized in that, The outer circumferential surface of the rotating rod is provided with bidirectional helical blades, which are arranged in opposite directions with the midpoint of the central axis of the rotating rod as a reference.

5. The coating die head structure of the extrusion coating machine according to claim 4, characterized in that, One end of each of the two rotating rods passes through the lower mold and is connected to the driving component, and is used to drive the bidirectional spiral blades to stir the slurry located in the mold cavity.

6. The coating die head structure of the extrusion coating machine according to claim 5, characterized in that, The surface of the lower mold is fitted with a protective cover that covers the drive component.

7. The coating die head structure of the extrusion coating machine according to claim 6, characterized in that, The protective cover has an opening on its surface.

8. The coating die head structure of the extrusion coating machine according to claim 5, characterized in that, The driving component includes: Electric motor; The worm gear is connected to the output end of the motor at one end and to the lower mold at the other end through a fixing component, so that the motor can drive the worm gear to rotate. The worm gear meshes with the worm and is connected to the end of a rotating rod that passes through the lower die. The worm gear drives a synchronous pulley to rotate via a transmission belt on its outer circumference. The synchronous pulley is connected to the end of another rotating rod that passes through the lower die.

9. The coating die head structure of the extrusion coating machine according to claim 8, characterized in that, The synchronizing wheel and the worm gear are both located on the same side of the lower mold.

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