Multi-region sub-control intermittent coating die head

Abstract

The invention belongs to the technical field of coating equipment, and particularly relates to a multi-area sub-control intermittent coating die head which comprises a lower die head, an upper die head is assembled at the upper end of the lower die head, a base plate is assembled between the lower die head and the upper die head, a first slurry cavity and a second slurry cavity are formed in the lower die head, and the first slurry cavity is communicated with the second slurry cavity. A plurality of upper flow channels are formed in the upper end of the base plate, a plurality of lower flow channels are formed in the lower end of the base plate, and a plurality of first drainage holes and a plurality of second drainage holes are formed in the base plate. Slurry is conveyed into the first slurry cavity and the second slurry cavity through the two sets of feeding modules correspondingly, drainage and coating are conducted on the slurry in the first slurry cavity and the second slurry cavity through the upper flow channel and the lower flow channel correspondingly, and the slurry coated on the surface of an electrode plate through the upper flow channel and the lower flow channel is combined to achieve a special coating effect; and a special coating effect in the manufacturing process of the 3C digital battery is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of coating equipment, and in particular relates to a multi-region sub-controlled intermittent coating die head. Background Art

[0002] In the field of modern industrial manufacturing, coating technology is one of the key processes to achieve material surface coating. Especially in industries such as batteries, electronics, medicine and packaging, precise coating technology is essential to improve product quality and performance. As the core component of the coating process, the design and function of the coating die directly affect the coating quality, efficiency and material utilization.

[0003] The existing coating die heads mainly achieve different coating effects by changing the gasket design and adding intermittent valves, such as continuous coating, stripe coating, gap coating and zebra coating (such as Figure 1 These coating effects can meet the needs of general industrial applications, but in some special application scenarios, such as the manufacturing process of 3C digital batteries, conventional coating dies and coating methods cannot meet more complex and sophisticated coating requirements.

[0004] The manufacturing of 3C digital batteries has strict requirements on coating accuracy and pattern, such as L-shaped coating, small square coating, small square gap coating and symmetrical L-shaped coating (such as Figure 1 The above special coating effect is of great significance for improving the performance and safety of 3C digital batteries. However, due to design limitations, it is difficult to achieve these complex coating patterns in existing coating dies.

[0005] Based on the above problems, this application document proposes a multi-zone controlled intermittent coating die to achieve a special coating effect in the manufacturing process of 3C digital batteries. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-region sub-controlled intermittent coating die head, which transports slurry to the inside of a first slurry chamber and a second slurry chamber respectively through two sets of feeding modules, drains and coats the slurry in the first slurry chamber and the second slurry chamber respectively through an upper flow channel and a lower flow channel, and the slurry coated on the surface of the electrode sheet through the upper flow channel and the lower flow channel is combined into a special coating effect, thereby realizing a special coating effect in the manufacturing process of 3C digital batteries.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A multi-region controlled intermittent coating die comprises a lower die, an upper die is mounted on the upper end of the lower die, a pad is mounted between the lower die and the upper die, a first slurry cavity and a second slurry cavity are provided inside the lower die, a plurality of upper flow channels are provided on the upper end of the pad, a plurality of lower flow channels are provided on the lower end of the pad, a plurality of first drainage holes and a plurality of second drainage holes are provided inside the pad, the first drainage hole and the second slurry cavity and the second drainage hole and the first slurry cavity are matched, the upper flow channel and the second slurry cavity are connected through the first drainage hole, and the lower flow channel and the first slurry cavity are connected through the second drainage hole.

[0009] In a preferred embodiment, a first servo intermittent control valve and a second servo intermittent control valve are fixed on one side of the lower die head, and a first feed cavity and a second feed cavity are opened inside the lower die head. The first slurry cavity and the first servo intermittent control valve are connected through the first feed cavity, and the second slurry cavity and the second servo intermittent control valve are connected through the second feed cavity.

[0010] In a preferred embodiment, a plurality of brackets are fixed to the upper end of the upper die head, a micrometer is installed inside the bracket, a T-block is installed at the lower end of the micrometer, and the T-block is matched with the pad.

[0011] In a preferred embodiment, a plurality of threaded bottom holes are evenly provided inside the lower die head, a plurality of screw through holes are evenly provided inside the upper die head, and a plurality of screw avoidance holes are evenly provided inside the pad plate. There is a one-to-one correspondence between the plurality of threaded bottom holes and the plurality of screw through holes, as well as between the plurality of screw through holes and the plurality of screw avoidance holes. In the working state, the lower die head and the upper die head are fixedly connected.

[0012] In a preferred embodiment, a first rotating shaft block is fixed on one side of the lower die head, and a second rotating shaft block is fixed on one side of the upper die head. The first rotating shaft block and the second rotating shaft block are rotatably connected. When not in operation, the lower die head and the upper die head are rotatably connected.

[0013] In a preferred embodiment, the thickness of the pad is denoted as H1, the depths of the upper flow channel and the lower flow channel are both denoted as H2, and H2≤0.4H1.

[0014] In a preferred embodiment, the number of the lower flow channel is at least one.

[0015] In a preferred embodiment, the internal threads of the lower die head are connected with a plurality of threaded rods, and the threaded rods penetrate the interior of the lower die head.

[0016] The technical effects achieved by the present invention are:

[0017] The present invention uses two sets of feeding modules to transport slurry to the first slurry chamber and the second slurry chamber respectively, and uses the upper flow channel and the lower flow channel to drain and coat the slurry in the first slurry chamber and the second slurry chamber respectively. The slurry coated on the surface of the electrode sheet through the upper flow channel and the lower flow channel is combined into a special coating effect, thereby achieving a special coating effect in the manufacturing process of 3C digital batteries;

[0018] The present invention stores the slurry in the first slurry chamber and the second slurry chamber respectively. When the upper flow channel and / or the lower flow channel stops coating, the slurry is stored in the first slurry chamber and the second slurry chamber under the action of gravity, which not only avoids the deviation of the coating effect and coating thickness caused by the continued flow of the slurry, but also avoids the waste of slurry and reduces the production cost.

[0019] In the process of coating the electrode sheet of the present invention, since the slurry is transported through the lower die head during the transportation process, when maintaining the device, only the lower die head and the backing plate need to be cleaned, which greatly reduces the maintenance time and improves the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a common schematic diagram of coating effects;

[0021] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 3 It is a rear view of the overall structure of the present invention;

[0023] Figure 4 is a cross-sectional view of the overall structure of the present invention;

[0024] Figure 5 The present invention Figure 3 A partial enlarged view of the middle A;

[0025] Figure 6 It is a structural schematic diagram of the lower die head of the present invention;

[0026] Figure 7 It is a structural schematic diagram of the pad of the present invention;

[0027] Figure 8 It is a bottom view of the structure of the pad of the present invention;

[0028] Fig. 9 Schematic diagram of the flow of the slurry in the lower die head of the present invention;

[0029] Fig.10 It is a schematic diagram of the L-type coating pattern of the present invention;

[0030] Fig.11 It is a schematic diagram of the pattern of small square coating of the present invention;

[0031] Fig.12 It is a schematic diagram of the pattern of small square gap coating of the present invention;

[0032] Fig.13 It is a schematic diagram of the symmetrical L-shaped coating pattern of the present invention;

[0033] Fig.14 It is a schematic diagram of the intermittent coating pattern of small squares of the present invention;

[0034] Fig.15 It is a schematic diagram of the structure of the pad during intermittent coating of small squares of the present invention.

[0035] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0036] 10. Lower die head; 11. First slurry cavity; 12. Second slurry cavity; 13. First servo intermittent control valve; 14. Second servo intermittent control valve; 15. First feed cavity; 16. Second feed cavity; 17. Threaded bottom hole; 18. First rotating shaft block; 19. Threaded rod; 20. Upper die head; 21. Bracket; 22. Micrometer; 23. T-block; 24. Screw through hole; 25. Second rotating shaft block; 30. Pad; 31. Upper flow channel; 32. Lower flow channel; 33. First drainage hole; 34. Second drainage hole; 35. Screw avoidance hole. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0041] Please see attached Figures 2 to 9 As shown, it is the first embodiment of the present invention, which provides a multi-region controlled intermittent coating die, including a lower die 10, an upper die 20 is installed at the upper end of the lower die 10, a pad 30 is installed between the lower die 10 and the upper die 20, the interior of the lower die 10 is provided with a first slurry chamber 11 and a second slurry chamber 12 from one side to the other, a plurality of upper flow channels 31 are opened at the upper end of the pad 30, a plurality of lower flow channels 32 are opened at the lower end of the pad 30, a plurality of first drainage holes 33 and a plurality of second drainage holes 34 are opened inside the pad 30, the first drainage hole 33 and the second slurry chamber 12 and the second drainage hole 34 and the first slurry chamber 11 are all adapted to each other, and the upper flow channel 31 and the second slurry chamber 12 are connected through the first drainage hole 33, and the lower flow channel 32 and the first slurry chamber 11 are connected through the second drainage hole 34.

[0042] Furthermore, the number of the lower flow channel 32 is at least one.

[0043] Here, the number and position of the upper flow channels 31 and the number and position of the lower flow channels 32 need to be customized according to the coating effect required in the manufacturing process of 3C digital batteries. The number and position of the upper flow channels 31 and the lower flow channels 32 on the pad 30 in the accompanying drawings only represent one style and do not constitute a specific limitation.

[0044] It should be noted that a plurality of threaded bottom holes 17 are uniformly provided inside the lower die head 10, a plurality of screw through holes 24 are uniformly provided inside the upper die head 20, and a plurality of screw avoidance holes 35 are uniformly provided inside the pad 30. There is a one-to-one correspondence between the plurality of threaded bottom holes 17 and the plurality of screw through holes 24, and between the plurality of screw through holes 24 and the plurality of screw avoidance holes 35. In the working state, the lower die head 10 and the upper die head 20 are fixedly connected by bolts passing through the screw through holes 24 and the interior of the screw avoidance holes 35 being threadedly connected with the threaded bottom holes 17; further, a first rotating shaft block 18 is fixed to one side of the lower die head 10, a plurality of threaded rods 19 are threadedly connected inside the lower die head 10, and the threaded rods 19 pass through the interior of the lower die head 10; a second rotating shaft block 25 is fixed to one side of the upper die head 20, and the first rotating shaft block 18 and the second rotating shaft block 25 are rotatably connected. In the non-working state, the lower die head 10 and the upper die head 20 are rotatably connected by the cooperation of the first rotating shaft block 18 and the second rotating shaft block 25.

[0045] In this embodiment, before coating the electrode sheet of the 3C digital battery, according to the required coating effect, a suitable pad 30 is replaced and assembled between the lower die head 10 and the upper die head 20. When coating, the slurry in the first slurry chamber 11 flows through the second drainage hole 34 and the lower flow channel 32 in sequence to be coated on the electrode sheet, and the slurry in the second slurry chamber 12 flows through the first drainage hole 33 and the upper flow channel 31 in sequence to be coated on the electrode sheet. The flow of the slurry in the second slurry chamber 12 and the first slurry chamber 11 is guided by the upper flow channel 31 and the lower flow channel 32 respectively. At the same time, the first servo intermittent control valve 13 and the second servo intermittent control valve 14 are used to control the flow of the slurry in the second slurry chamber 12 and the first slurry chamber 11. The coating frequency and coating duration of the upper flow channel 31 and the lower flow channel 32 are controlled respectively to achieve different coating effects. In this process, when the coating is stopped, the slurry is stored in the first slurry chamber 11 and the second slurry chamber 12 under the action of gravity, which reduces the probability of the slurry overflowing from the upper flow channel 31 and / or the lower flow channel 32. It not only avoids the deviation of the coating effect and the coating thickness, but also avoids the waste of slurry and reduces the production cost. Moreover, since the slurry is transported through the lower die head 10 during the maintenance of the device, it is only necessary to clean the lower die head 10 and the pad 30, which greatly reduces the maintenance time and improves the maintenance efficiency.

[0046] Next, please refer to Figure 3 and Figure 4 As shown, a first servo intermittent control valve 13 and a second servo intermittent control valve 14 are fixed to one side of the lower die head 10, and a first feed cavity 15 and a second feed cavity 16 are opened inside the lower die head 10. The first slurry cavity 11 and the first servo intermittent control valve 13 are connected through the first feed cavity 15, and the second slurry cavity 12 and the second servo intermittent control valve 14 are connected through the second feed cavity 16.

[0047] It should be noted that two sets of feeding modules are used in conjunction with the present device, wherein the output end of one set of feeding modules is connected to the input end of the first servo intermittent control valve 13, and the output end of the other set of feeding modules is connected to the input end of the second servo intermittent control valve 14, and slurry is respectively input into the first slurry chamber 11 and the second slurry chamber 12 through the two sets of feeding modules.

[0048] In this embodiment, through the cooperation of the first servo intermittent control valve 13 and the second servo intermittent control valve 14, intermittent feeding can be achieved to the inside of the first slurry chamber 11 and the second slurry chamber 12 respectively, so as to achieve the purpose of intermittent coating, and the slurry intermittently coated by the upper flow channel 31 and the lower flow channel 32 is spliced ​​and combined, so as to achieve a special coating effect in the manufacturing process of 3C digital batteries.

[0049] Secondly, please also refer to Figures 2 to 4A plurality of brackets 21 are fixed to the upper end of the upper die head 20 in sequence from one end to the other end, a micrometer 22 is assembled inside the bracket 21, a T-block 23 is assembled at the lower end of the micrometer 22, and the T-block 23 is matched with the pad 30.

[0050] In this embodiment, by adjusting the position of the T block 23 by the micrometer 22, the size of the slit gap can be accurately controlled to ensure that the slurry can be evenly coated on the surface of the electrode sheet during the coating process, thereby improving the coating accuracy and uniformity.

[0051] In a preferred embodiment, the thickness of the pad 30 is denoted as H1, and the depths of the upper flow channel 31 and the lower flow channel 32 are both denoted as H2, where H2≤0.4H1.

[0052] In this embodiment, due to the arrangement of the upper flow channel 31 and the lower flow channel 32, the local thickness of the pad 30 is reduced. Through the arrangement of the above-mentioned scheme, the strength of the pad 30 is improved while ensuring the integrity of the pad 30.

[0053] In a specific embodiment, see Fig.10 As shown, during L coating, two sets of feeding modules are used to transport slurry to the first slurry chamber 11 and the second slurry chamber 12 respectively. The slurry in the first slurry chamber 11 and the second slurry chamber 12 flows out through the upper flow channel 31 and the lower flow channel 32 respectively and is coated on the electrode sheet surface of the 3C digital analog battery. In this process, the coating frequency of the upper flow channel 31 and the lower flow channel 32 is controlled by the first servo intermittent control valve 13 and the second servo intermittent control valve 14 respectively. In the same coating cycle, the coating time of the upper flow channel 31 is longer than the coating time of the lower flow channel 32, and the electrode sheet can be L-shaped coated. The structural style of the pad 30 can refer to Fig.10 As shown, of course, the specific structural style of the pad 30 can be adjusted according to specific production requirements, and this does not constitute a specific limitation.

[0054] It should be noted that the coating cycle refers to the time period from the start of a single coating to the start of the next coating.

[0055] In another specific embodiment, see Fig.11 As shown, when the small square coating is performed, the slurry is transported to the first slurry chamber 11 and the second slurry chamber 12 respectively through two sets of feeding modules, and the slurry in the first slurry chamber 11 and the second slurry chamber 12 flows out through the upper flow channel 31 and the lower flow channel 32 respectively and is coated on the surface of the electrode sheet of the 3C digital analog battery. In this process, the upper flow channel 31 always coats the electrode sheet, and the lower flow channel 32 intermittently coats the electrode sheet, so that the electrode sheet can be coated in a small square pattern. The structural style of the pad 30 can refer to Fig.11As shown, of course, the specific structural style of the pad 30 can be adjusted according to specific production requirements, and it does not constitute a specific limitation here.

[0056] In another specific embodiment, see Fig.12 As shown, when performing small square gap coating, two sets of feeding modules are used to transport slurry to the first slurry chamber 11 and the second slurry chamber 12 respectively, and the slurry in the first slurry chamber 11 and the second slurry chamber 12 flows out through the upper flow channel 31 and the lower flow channel 32 respectively and is coated on the surface of the electrode sheet of the 3C digital analog battery. In this process, the upper flow channel 31 always coats the electrode sheet, and the lower flow channel 32 intermittently coats the electrode sheet, so that the electrode sheet can be coated in a small square pattern. The structural style of the pad 30 can refer to Fig.12 As shown, of course, the specific structural style of the pad 30 can be adjusted according to specific production requirements, and it does not constitute a specific limitation here.

[0057] In another specific embodiment, see Fig.13 As shown, when performing symmetrical L-shaped coating, two sets of feeding modules are used to transport slurry to the first slurry chamber 11 and the second slurry chamber 12 respectively, and the slurry in the first slurry chamber 11 and the second slurry chamber 12 flows out through the upper flow channel 31 and the lower flow channel 32 respectively and is coated on the surface of the electrode sheet of the 3C digital analog battery. In this process, the coating frequency of the upper flow channel 31 and the lower flow channel 32 is controlled by the first servo intermittent control valve 13 and the second servo intermittent control valve 14 respectively. In the same coating cycle, the coating time of the upper flow channel 31 is longer than the coating time of the lower flow channel 32, and the electrode sheet can be symmetrically coated in L shape, wherein the structural style of the pad 30 can refer to Fig.13 As shown, of course, the specific structural style of the pad 30 can be adjusted according to specific production requirements, and it does not constitute a specific limitation here.

[0058] In another specific embodiment, see Figure 14 to Figure 15 As shown, when performing intermittent coating of small squares, two sets of feeding modules are used to transport slurry to the first slurry chamber 11 and the second slurry chamber 12 respectively, and the slurry in the first slurry chamber 11 and the second slurry chamber 12 flows out through the upper flow channel 31 and the lower flow channel 32 respectively and is coated on the surface of the electrode sheet of the 3C digital analog battery. In this process, the coating frequency of the upper flow channel 31 and the lower flow channel 32 is controlled by the first servo intermittent control valve 13 and the second servo intermittent control valve 14 respectively. In the same coating cycle, the coating time of the upper flow channel 31 is longer than the coating time of the lower flow channel 32, and the upper flow channel 31 and the lower flow channel 32 are coated alternately, so that the electrode sheet can be intermittently coated with small squares, wherein the structural style of the pad 30 can refer to Fig.15As shown, of course, the specific structural style of the pad 30 can be adjusted according to specific production requirements, and it does not constitute a specific limitation here (here, in this embodiment, the top view of the structure of the pad 30 can be referred to in Fig.15 As shown in a, the bottom view of the structure of the pad 30 can be seen in Fig.15 (as shown in b).

[0059] The working principle of the present invention is:

[0060] Before coating the electrode sheet of the 3C digital battery, according to the required coating effect, a suitable pad 30 is replaced and assembled between the lower die head 10 and the upper die head 20. During coating, the slurry in the first slurry chamber 11 flows through the second drainage hole 34 and the lower flow channel 32 in sequence to be coated on the electrode sheet, and the slurry in the second slurry chamber 12 flows through the first drainage hole 33 and the upper flow channel 31 in sequence to be coated on the electrode sheet. The slurry in the second slurry chamber 12 and the first slurry chamber 11 is respectively coated through the upper flow channel 31 and the lower flow channel 32. The flow is guided, and at the same time, the coating frequency and coating duration of the upper flow channel 31 and the lower flow channel 32 are controlled by the first servo intermittent control valve 13 and the second servo intermittent control valve 14 respectively to achieve different coating effects. In this process, when the upper flow channel 31 and / or the lower flow channel 32 stop coating, the slurry is stored in the first slurry chamber 11 and the second slurry chamber 12 under the action of gravity, which reduces the probability of the slurry overflowing from the upper flow channel 31 and / or the lower flow channel 32, and avoids deviations in coating effect and coating thickness.

[0061] The above are only preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the art unless otherwise specified and limited.

Claims

1. A multi-zone controlled intermittent coating die head, characterized in that: The invention comprises a lower die head (10), the upper end of which is equipped with an upper die head (20), a pad (30) is arranged between the lower die head (10) and the upper die head (20), a first slurry cavity (11) and a second slurry cavity (12) are provided inside the lower die head (10), a plurality of upper flow channels (31) are provided at the upper end of the pad (30), a plurality of lower flow channels (32) are provided at the lower end of the pad (30), and a plurality of lower flow channels (33) are provided at the lower end of the pad (30). A plurality of first drainage holes (33) and a plurality of second drainage holes (34) are provided inside the slurry chamber (30), the first drainage holes (33) and the second slurry chamber (12) as well as the second drainage holes (34) and the first slurry chamber (11) are adapted to each other, and the upper flow channel (31) and the second slurry chamber (12) are connected via the first drainage holes (33), and the lower flow channel (32) and the first slurry chamber (11) are connected via the second drainage holes (34).

2. The multi-zone controlled intermittent coating die head according to claim 1, characterized in that: A first servo intermittent control valve (13) and a second servo intermittent control valve (14) are fixed on one side of the lower die head (10), and a first feed cavity (15) and a second feed cavity (16) are provided inside the lower die head (10); the first slurry cavity (11) and the first servo intermittent control valve (13) are connected via the first feed cavity (15), and the second slurry cavity (12) and the second servo intermittent control valve (14) are connected via the second feed cavity (16).

3. The multi-zone controlled intermittent coating die head according to claim 1, characterized in that: A plurality of brackets (21) are fixed to the upper end of the upper die head (20), a micrometer (22) is installed inside the bracket (21), a T block (23) is installed at the lower end of the micrometer (22), and the T block (23) and the pad (30) are matched.

4. The multi-zone controlled intermittent coating die head according to claim 1, characterized in that: The lower die head (10) is evenly provided with a plurality of threaded bottom holes (17), the upper die head (20) is evenly provided with a plurality of screw through holes (24), and the pad (30) is evenly provided with a plurality of screw avoidance holes (35). There is a one-to-one correspondence between the plurality of threaded bottom holes (17) and the plurality of screw through holes (24), and between the plurality of screw through holes (24) and the plurality of screw avoidance holes (35). In the working state, the lower die head (10) and the upper die head (20) are fixedly connected.

5. The multi-zone controlled intermittent coating die head according to claim 1, characterized in that: A first rotating shaft block (18) is fixed on one side of the lower die head (10), and a second rotating shaft block (25) is fixed on one side of the upper die head (20). The first rotating shaft block (18) and the second rotating shaft block (25) are rotatably connected. When in a non-working state, the lower die head (10) and the upper die head (20) are rotatably connected.

6. The multi-zone controlled intermittent coating die head according to claim 1, characterized in that: The thickness of the pad (30) is denoted as H1, and the depths of the upper flow channel (31) and the lower flow channel (32) are both denoted as H2, where H2≤0.4H1.

7. The multi-zone controlled intermittent coating die head according to claim 1, characterized in that: The number of the lower flow channel (32) is at least one.

8. The multi-zone controlled intermittent coating die head according to claim 1, characterized in that: The lower die head (10) is internally threadedly connected to a plurality of threaded rods (19), and the threaded rods (19) penetrate the interior of the lower die head (10).

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