Height adjusting mechanism of horn mesh block for horn mesh automobile door plate injection mold

Abstract

This utility model provides a height adjustment mechanism for the horn mesh insert in an injection mold for automotive door panels, belonging to the field of mold technology. It includes an upper mold plate and a lower mold plate, with a molding cavity between them. A door panel forming block protrudes from the lower mold plate, and a top block lower injection mechanism is located at the bottom of the outer edge of the door panel forming block. A top plate connected to the top block lower injection mechanism is located on the lower side of the lower mold plate. The lower mold plate also features a height-adjustable horn mesh forming mechanism connected to the top plate. By incorporating this height-adjustable horn mesh forming mechanism on the lower mold plate and connected to the top plate, the height of the horn mesh forming insert is adjustable, allowing for flexible adjustment of the thickness of the horn mesh on the automotive door panel. This solves the problem of traditional molds being unable to adjust the thickness, improving the mold's applicability and flexibility.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a height adjustment mechanism for the mesh insert of a horn mesh automotive door panel injection mold. Background Technology

[0002] In the injection molding process of automotive door panels, the horn mesh is a key functional structure, and its molding quality directly affects the acoustic performance and appearance integrity of the door panel. In existing technologies, the horn mesh molding inserts used in automotive door panel injection molds are generally designed with a fixed height. The relative position of the insert and the mold cavity cannot be dynamically adjusted. This structural limitation means that the thickness of the horn mesh area of ​​the molded automotive door panel is entirely determined by the height of the insert, and cannot be flexibly adjusted according to the acoustic design requirements of different models, the material characteristics of the door panel, or the assembly precision requirements. In actual production, if the horn mesh thickness parameters need to be changed, the entire molding insert needs to be replaced. This not only increases the mold replacement time and production cost, but may also affect the mesh molding accuracy due to the positioning error after the insert is replaced, causing many inconveniences to production debugging.

[0003] For example, a Chinese patent discloses an injection mold for automotive door panel trim [application number: 202020609267.1], which includes a device body, a top plate, and an ejector plate. The upper end of the device body is connected to a moving mold mechanism, and the front end of the moving mold mechanism is connected to a lifting assembly. The lower end of the top plate is connected to a fixed mold mechanism, and the outer side of the fixed mold mechanism is connected to an injection tube. The right end of the moving mold mechanism is connected to a cooling pipe assembly, and the right end of the moving mold mechanism is connected to a hot runner pipe assembly. A limit switch is connected to the outer side of one end of the moving mold mechanism. One end of the limit switch is connected to a connecting rod, and the other end of the connecting rod is connected to a mounting base. A hydraulic cylinder is provided inside the mounting base. Utility Model Content

[0004] The purpose of this utility model is to address the above-mentioned problems by providing a height adjustment mechanism for the mesh insert of a car door panel injection mold with a speaker mesh.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A height adjustment mechanism for the mesh insert of a car door panel injection mold with a horn mesh includes an upper template and a lower template. A molding cavity is provided between the upper template and the lower template. A door panel molding block is protruding from the lower template. A top block lower glue injection mechanism is provided at the bottom of the outer edge of the door panel molding block. A top plate connected to the top block lower glue injection mechanism is provided on the lower side of the lower template. The lower template is also provided with a height-adjustable horn mesh molding mechanism connected to the top plate.

[0007] In the above-mentioned height adjustment mechanism for the horn mesh injection mold mesh insert of the car door panel, the height-adjustable horn mesh forming mechanism includes a horn mesh forming block with a circular cross-section embedded in the door panel forming block. An external ejection component is provided on the outer side of the horn mesh forming block along the circumferential direction. The horn mesh forming block is connected to the top plate through the adjustment component.

[0008] In the above-mentioned height adjustment mechanism for the horn mesh automotive door panel injection mold mesh insert, the adjustment component includes a molding block mounting plate fixed to the bottom of the lower template, an upper mounting plate provided on the molding block mounting plate, the horn mesh molding block being fixed to the upper mounting plate by several connecting rods, and a lifting driver being fixedly connected to the top plate, the output shaft end of the lifting driver passing through the molding block mounting plate and connected to the upper mounting plate.

[0009] In the above-mentioned height adjustment mechanism for the mesh insert of the horn mesh automotive door panel injection mold, the external ejection assembly includes several first inclined ejector blocks and several first straight ejector blocks. The first inclined ejector blocks are connected to the top plate through first inclined ejector rods, and the first straight ejector blocks are connected to the top plate through first straight ejector rods.

[0010] In the above-mentioned height adjustment mechanism for the mesh insert of the horn mesh automotive door panel injection mold, the top block lower glue injection mechanism includes several glue injection top blocks evenly arranged along the outer edge of the door panel forming block. The inner end of the glue injection top block is connected to the bottom of the side wall of the door panel forming block. The lower template is also provided with a glue injection port corresponding to the glue injection top block. The glue injection port is located on the side of the glue injection top block. The glue injection top block is provided with a lower glue injection structure connecting the glue injection port and the bottom of the side wall of the door panel forming block. The bottom of the glue injection top block is connected to the top plate through a second inclined push rod.

[0011] In the above-mentioned height adjustment mechanism for the mesh insert of the horn mesh automotive door panel injection mold, the lower glue inlet structure includes a corner glue inlet channel recessed inward on the side of the glue inlet top block. The glue inlet side of the corner glue inlet channel is connected to the glue inlet, and the glue outlet of the corner glue inlet channel is located at the top of the glue inlet top block and connected to the bottom of the side wall of the door panel molding block.

[0012] In the aforementioned height adjustment mechanism for the mesh insert of the horn mesh automotive door panel injection mold, the lower template is also provided with a secondary ejection mechanism.

[0013] In the above-mentioned height adjustment mechanism for the mesh insert of the horn mesh automotive door panel injection mold, the secondary ejection mechanism includes a straight inclined ejection assembly and an air ejection block composite ejection assembly connected to the top plate.

[0014] In the above-mentioned height adjustment mechanism for the mesh insert of the horn mesh automotive door panel injection mold, the straight inclined ejector assembly includes several second inclined ejector blocks and several vertically arranged vertical ejector rods. The second inclined ejector blocks are connected to the top plate through third inclined ejector rods, and the bottom of the vertical ejector rods is connected to the top plate.

[0015] In the aforementioned height adjustment mechanism for the mesh insert of the horn mesh automotive door panel injection mold, the air ejector block composite ejection assembly includes an inclined air ejector block and a straight air ejector block. The inclined air ejector block is connected to the top plate via an inclined air ejector rod, and the straight air ejector block is connected to the top plate via a straight air ejector rod. The lower part of the inclined air ejector rod and the straight air ejector rod is provided with an air inlet connector connected to the gas channel inside the inclined air ejector rod and the straight air ejector rod. The inclined air ejector block and the straight air ejector block are provided with an air ejector flow channel connected to the gas channel. The air ejector flow channel has several exhaust ports, and the exhaust ports are located on the side of the inclined air ejector block and the straight air ejector block.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. By setting an adjustable height horn mesh forming mechanism connected to the top plate on the lower template, the height of the horn mesh forming insert can be adjusted, thereby flexibly adjusting the thickness of the horn mesh on the car door panel. This solves the problem that traditional molds cannot be adjusted, improving the applicability and flexibility of the mold. The bottom gluing mechanism of the top block changes the traditional gluing position, allowing the glue to fill the molding cavity more evenly, reducing the generation of molding defects such as air bubbles and material shortages. It also allows the glue gate to be formed at the bottom of the side wall, reducing the impact of the glue gate on product quality.

[0018] 2. The height-adjustable horn mesh forming mechanism uses a horn mesh forming block with a circular cross-section and an external ejection component on its outer side. The component is connected to the top plate through adjustment. This design makes the height adjustment of the horn mesh forming block more stable. The external ejection component can assist the door panel to be demolded smoothly after forming, avoiding damage to the door panel caused by poor demolding.

[0019] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0021] Figure 2 This is a structural diagram of the lower template;

[0022] Figure 3 This is a partial structural schematic diagram of the present invention;

[0023] Figure 4 This is a schematic diagram of the height-adjustable speaker mesh forming mechanism;

[0024] Figure 5 This is a structural schematic diagram of the gas-operated top block composite ejection assembly;

[0025] Figure 6 This is a partial structural diagram of the top block bottom glue feeding mechanism;

[0026] Figure 7 yes Figure 2 Enlarged diagram of point A in the middle. Detailed Implementation

[0027] like Figures 1-7 As shown, a height adjustment mechanism for the mesh insert of a car door panel injection mold with a horn mesh includes an upper template 1 and a lower template 2. A molding cavity is provided between the upper template 1 and the lower template 2. A door panel molding block 3 is protruding from the lower template 2. A top block lower glue injection mechanism 4 is provided at the bottom of the outer edge of the door panel molding block 3. A top plate 5 connected to the top block lower glue injection mechanism 4 is provided on the lower side of the lower template 2. A height-adjustable horn mesh molding mechanism 6 connected to the top plate 5 is also provided on the lower template 2.

[0028] In this invention, by setting a height-adjustable horn mesh forming mechanism connected to the top plate on the lower template, the height of the horn mesh forming insert is adjustable, thereby flexibly adjusting the thickness of the horn mesh on the car door panel. This solves the problem that traditional molds cannot be adjusted, improving the applicability and flexibility of the mold. The bottom glue injection mechanism of the top block changes the traditional glue injection position, allowing the glue to fill the molding cavity more evenly, reducing the generation of molding defects such as air bubbles and material shortages. It also allows the glue gate to be formed at the bottom of the side wall, reducing the impact of the glue gate on product quality.

[0029] Specifically, the height-adjustable horn mesh forming mechanism 6 includes a horn mesh forming block 7 with a circular cross-section, embedded in the door panel forming block 3. An external ejection assembly is circumferentially arranged on the outer side of the horn mesh forming block 7. The horn mesh forming block 7 is connected to the top plate 5 via an adjustment assembly. This height-adjustable horn mesh forming mechanism uses a horn mesh forming block with a circular cross-section and an external ejection assembly on its outer side, connected to the top plate via the adjustment assembly. This design makes the height adjustment of the horn mesh forming block more stable, and the external ejection assembly assists in the smooth demolding of the formed door panel, avoiding damage to the door panel due to poor demolding.

[0030] Specifically, the adjustment assembly includes a forming block mounting plate 8 fixed to the bottom of the lower template 2, an upper mounting plate 9 mounted on the forming block mounting plate 8, and a horn mesh forming block 7 fixed to the upper mounting plate 9 by several connecting rods. A lifting driver 10 is fixedly connected to the top plate 5, and the output shaft end of the lifting driver 10 passes through the forming block mounting plate 8 and is connected to the upper mounting plate 9. Through the cooperation of the forming block mounting plate, the upper mounting plate, the connecting rods, and the lifting driver, the adjustment assembly makes the height adjustment of the horn mesh forming block more precise and controllable. The lifting driver provides stable power, the connecting rods ensure a firm connection between the forming block and the upper mounting plate, and the arrangement of the forming block mounting plate and the upper mounting plate ensures structural stability during the adjustment process, effectively avoiding offset or shaking during adjustment, and improving the accuracy and reliability of height adjustment.

[0031] Those skilled in the art should understand that the lifting drive can be a hydraulic cylinder, a pneumatic cylinder, or a linear motor, etc.

[0032] Specifically, the external ejection assembly includes several first inclined ejector blocks 11 and several first straight ejector blocks 12. The first inclined ejector blocks 11 are connected to the top plate 5 via first inclined ejector rods 13, and the first straight ejector blocks 12 are connected to the top plate 5 via first straight ejector rods 14. The external ejection assembly uses a combination of first inclined ejector blocks and first straight ejector blocks, connected to the top plate via first inclined ejector rods and first straight ejector rods. This design allows for ejection of the molded door panel from different directions and angles, ensuring uniform force distribution on the door panel and avoiding deformation or damage that might occur with a single ejection method. This ensures smooth demolding of the door panel and improves product quality and production efficiency.

[0033] Specifically, the top block lower glue inlet mechanism 4 includes a plurality of glue inlet top blocks 15 evenly arranged along the outer edge of the door panel forming block 3. The inner end of the glue inlet top block 15 is connected to the bottom of the side wall of the door panel forming block 3. The lower template 2 is also provided with a glue inlet 16 corresponding to the glue inlet top block 15. The glue inlet 16 is located on the side of the glue inlet top block 15. The glue inlet top block 15 is provided with a lower glue inlet structure connecting the glue inlet 16 and the bottom of the side wall of the door panel forming block 3. The bottom of the glue inlet top block 15 is connected to the top plate 5 through a second inclined top rod 30. The bottom-feeding mechanism, through a top-feeding block set along the outer edge of the door panel molding block, in conjunction with a bottom-feeding structure and a second inclined ejector rod, enables glue to be fed from the bottom of the door panel molding block. This bottom-feeding method changes the traditional glue-feeding position, allowing the glue to fill the molding cavity more evenly, reducing molding defects such as air bubbles and material shortages. It also allows the glue gate to be formed at the bottom of the side wall, reducing the impact of the glue gate on product quality. At the same time, the second inclined ejector rod is connected to the top plate, facilitating the ejection and resetting of the top-feeding block, ensuring smooth glue feeding and demolding processes.

[0034] Specifically, the lower glue-feeding structure includes a recessed corner glue-feeding channel 17 located on the side of the glue-feeding top block 15. The glue-feeding side of the corner glue-feeding channel 17 is connected to the glue-feeding port 16, and the glue-out port 18 of the corner glue-feeding channel 17 is located at the top of the glue-feeding top block 15 and connected to the bottom of the side wall of the door panel molding block 3. The lower glue-feeding structure uses a corner glue-feeding channel, allowing the glue to enter the molding cavity from the glue-feeding port after passing through the corner and exiting from the glue-out port at the top of the glue-feeding top block. The corner design slows down the flow speed of the glue, avoiding molding problems caused by excessive glue impact, and at the same time allows the glue to fill the bottom of the side wall of the door panel molding block more smoothly, ensuring the molding quality of this part and reducing product defects caused by improper glue-feeding.

[0035] Preferably, the lower mold plate 2 is also provided with a secondary ejection mechanism 19. The secondary ejection mechanism provided on the lower mold plate can perform a secondary ejection action on the basis of the first ejection. This design solves the door panel sticking problem that may occur in traditional single ejection, further ensuring that the door panel can be demolded smoothly, avoiding door panel damage and production stoppage caused by incomplete demolding, and improving the stability and continuity of production.

[0036] Specifically, the secondary ejection mechanism 19 includes a straight-angle ejection assembly and a combined ejection assembly 20 connected to the top plate 5. The secondary ejection mechanism uses a combination of the straight-angle ejection assembly and the combined ejection assembly. The straight-angle ejection assembly provides ejection force from a mechanical perspective, while the combined ejection assembly uses gas pressure to assist ejection. The two ejection methods work together to achieve a better ejection effect, which can adapt to the demolding requirements of door panels with different structures and materials, and improve the reliability and flexibility of demolding.

[0037] Specifically, the inclined ejector assembly includes several second inclined ejector blocks 21 and several vertically arranged vertical ejector rods 23. The second inclined ejector blocks 21 are connected to the top plate 5 via third inclined ejector rods, and the bottom of the vertical ejector rods 23 are connected to the top plate 5. The second inclined ejector blocks and vertical ejector rods in the inclined ejector assembly are connected to the top plate via third inclined ejector rods and directly to the top plate, respectively. This allows for the application of ejection force to the door panel from both inclined and vertical directions. This multi-directional ejection design ensures more balanced force on the door panel during demolding, effectively preventing bending or deformation of the door panel during demolding and guaranteeing the shape accuracy and appearance quality of the door panel.

[0038] Specifically, the air-jacking block composite ejection assembly 20 includes an inclined air-jacking block 24 and a straight air-jacking block 25. The inclined air-jacking block 24 is connected to the top plate 5 via an inclined air-jacking rod 26, and the straight air-jacking block 25 is connected to the top plate 5 via a straight air-jacking rod 27. The lower part of the inclined air-jacking rod 26 and the straight air-jacking rod 27 is provided with an air-jacking flow channel 28 connected to the gas channel. The air-jacking flow channel 28 has several exhaust ports, and the exhaust ports are located on the side of the inclined air-jacking block 24 and the straight air-jacking block 25. The inclined and straight air ejector blocks of the air ejector composite ejection assembly are connected to the top plate through inclined and straight air ejector rods. Gas ejection is achieved through gas channels and air ejector flow channels. The gas ejection method has a buffering effect, which can avoid damage to the door panel surface that may be caused by mechanical ejection. At the same time, multiple exhaust ports of the air ejector flow channel are set on the side, so that the gas can act evenly on the door panel, further improving the stability and safety of ejection and ensuring high-quality demolding of the door panel.

[0039] The working principle of this utility model is as follows: by setting a height-adjustable horn mesh forming mechanism connected to the top plate on the lower template, the height of the horn mesh forming insert can be adjusted, thereby flexibly adjusting the thickness of the horn mesh on the car door panel, solving the problem that traditional molds cannot be adjusted, and improving the applicability and flexibility of the mold. The bottom glue injection mechanism of the top block changes the traditional glue injection position, so that the glue can be filled into the molding cavity more evenly, reducing the generation of molding defects such as air bubbles and material shortage, and also making the glue gate form at the bottom of the side wall, reducing the impact of the glue gate on product quality.

[0040] The height-adjustable horn mesh forming mechanism uses a circular cross-section horn mesh forming block with an external ejector assembly on its outer side. This assembly is connected to the top plate via an adjustment mechanism. This design makes the height adjustment of the horn mesh forming block more stable. The external ejector assembly assists in the smooth demolding of the formed door panel, preventing damage caused by poor demolding. The adjustment mechanism, through the cooperation of the forming block mounting plate, upper mounting plate, connecting rod, and lifting drive, makes the height adjustment of the horn mesh forming block more precise and controllable. The lifting drive provides stable power, and the connecting rod ensures the connection between the forming block and the upper mounting plate. The plates are firmly connected, and the setting of the molding block mounting plate and the upper mounting plate ensures the structural stability during the adjustment process, effectively avoiding deviation or shaking during adjustment, and improving the accuracy and reliability of height adjustment. The external ejection component adopts a combination of the first inclined ejector block and the first straight ejector block, which are connected to the top plate through the first inclined ejector rod and the first straight ejector rod. This design can eject the molded door panel from different directions and angles, so that the door panel is subjected to uniform force, avoiding the door panel deformation or damage that may be caused by a single ejection method, ensuring the smooth demolding of the door panel, and improving product quality and production efficiency.

[0041] The bottom-feeding mechanism, using a top-feeding block positioned along the outer edge of the door panel molding block, in conjunction with a bottom-feeding structure and a second inclined ejector, enables glue to be injected from the bottom of the door panel molding block. This bottom-feeding method changes the traditional injection position, allowing the glue to fill the molding cavity more evenly, reducing molding defects such as air bubbles and insufficient material. It also ensures the glue outlet forms at the bottom of the side wall, minimizing its impact on product quality. Simultaneously, the second inclined ejector connects to the top plate, facilitating the ejection and repositioning of the top-feeding block, ensuring smooth injection and demolding processes. The bottom-feeding structure employs a corner injection channel, allowing the glue to enter the molding cavity from the injection port, passing through the corner and exiting through the outlet at the top of the top-feeding block. The corner design slows down the glue flow rate, preventing molding problems caused by excessive glue impact, and allows the glue to fill the bottom of the door panel molding block's side wall more smoothly, ensuring molding quality in this area and reducing product defects caused by improper injection.

[0042] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A height adjustment mechanism for a perforated insert in an injection mold for a car door panel, comprising an upper template (1) and a lower template (2), characterized in that, A forming cavity is provided between the upper template (1) and the lower template (2). A door panel forming block (3) is protruding from the lower template (2). A top block lower glue inlet mechanism (4) is provided at the bottom of the outer edge of the door panel forming block (3). A top plate (5) connected to the top block lower glue inlet mechanism (4) is provided on the lower side of the lower template (2). A height-adjustable horn mesh forming mechanism (6) connected to the top plate (5) is also provided on the lower template (2).

2. The height adjustment mechanism for the perforated insert of the horn mesh automotive door panel injection mold according to claim 1, characterized in that, The height-adjustable horn mesh forming mechanism (6) includes a horn mesh forming block (7) with a circular cross-section embedded in the door panel forming block (3). The horn mesh forming block (7) has an external ejection component arranged circumferentially on its outer side. The horn mesh forming block (7) is connected to the top plate (5) through the adjustment component.

3. The height adjustment mechanism for the perforated insert of the horn mesh automotive door panel injection mold according to claim 2, characterized in that, The adjustment assembly includes a molding block mounting plate (8) fixed to the bottom of the lower template (2), an upper mounting plate (9) is provided on the molding block mounting plate (8), the horn mesh molding block (7) is fixed on the upper mounting plate (9) by several connecting rods, and a lifting driver (10) is fixedly connected to the top plate (5). The output shaft end of the lifting driver (10) passes through the molding block mounting plate (8) and is connected to the upper mounting plate (9).

4. The height adjustment mechanism for the mesh insert of the horn mesh automotive door panel injection mold according to claim 3, characterized in that, The external ejection assembly includes several first inclined ejector blocks (11) and several first straight ejector blocks (12). The first inclined ejector blocks (11) are connected to the top plate (5) through first inclined ejector rods (13), and the first straight ejector blocks (12) are connected to the top plate (5) through first straight ejector rods (14).

5. The height adjustment mechanism for the perforated insert of the horn mesh automotive door panel injection mold according to claim 1, characterized in that, The top block lower glue inlet mechanism (4) includes several glue inlet top blocks (15) evenly arranged along the outer edge of the door panel forming block (3). The inner end of the glue inlet top block (15) is connected to the bottom of the side wall of the door panel forming block (3). The lower template (2) is also provided with a glue inlet (16) corresponding to the glue inlet top block (15). The glue inlet (16) is located on the side of the glue inlet top block (15). The glue inlet top block (15) is provided with a lower glue inlet structure connecting the glue inlet (16) and the bottom of the side wall of the door panel forming block (3). The bottom of the glue inlet top block (15) is connected to the top plate (5) through the second inclined top rod (30).

6. The height adjustment mechanism for the perforated insert of the horn mesh automotive door panel injection mold according to claim 5, characterized in that, The lower glue inlet structure includes a corner glue inlet channel (17) recessed inward on the side of the glue inlet top block (15). The glue inlet side of the corner glue inlet channel (17) is connected to the glue inlet (16), and the glue outlet (18) of the corner glue inlet channel (17) is located at the top of the glue inlet top block (15) and connected to the bottom of the side wall of the door panel forming block (3).

7. The height adjustment mechanism for the perforated insert of the horn mesh automotive door panel injection mold according to claim 1, characterized in that, The lower template (2) is also provided with a secondary ejection mechanism (19).

8. The height adjustment mechanism for the perforated insert of the horn mesh automotive door panel injection mold according to claim 7, characterized in that, The secondary ejection mechanism (19) includes a straight inclined ejection assembly and an air-jacking block composite ejection assembly (20) connected to the top plate (5).

9. The height adjustment mechanism for the mesh insert of the horn mesh automotive door panel injection mold according to claim 8, characterized in that, The straight inclined ejector assembly includes several second inclined ejector blocks (21) and several vertically arranged vertical ejector rods (23). The second inclined ejector blocks (21) are connected to the top plate (5) through third inclined ejector rods, and the bottom of the vertical ejector rods (23) are connected to the top plate (5).

10. The height adjustment mechanism for the mesh insert of the horn mesh automotive door panel injection mold according to claim 8, characterized in that, The gas-top block composite ejection assembly (20) includes an inclined gas-top block (24) and a straight gas-top block (25). The inclined gas-top block (24) is connected to the top plate (5) via an inclined gas-top rod (26). The straight gas-top block (25) is connected to the top plate (5) via a straight gas-top rod (27). The lower part of the inclined gas-top rod (26) and the straight gas-top rod (27) is provided with an air inlet connector connected to the gas channel inside the inclined gas-top rod (26) and the straight gas-top rod (27). The inclined gas-top block (24) and the straight gas-top block (25) are provided with a gas-top flow channel (28) connected to the gas channel. The gas-top flow channel (28) has several exhaust ports, and the exhaust ports are located on the side of the inclined gas-top block (24) and the straight gas-top block (25).

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