Gunpowder grain compression molding die

Abstract

The utility model relates to the technical field of gunpowder production equipment, in particular to a gunpowder grain compression molding die which comprises an outer die, a lower punch and an upper punch are arranged in the outer die, and the upper punch is arranged above the lower punch in a lifting mode so that a compression cavity for containing and compressing a gunpowder grain can be formed between the upper punch and the lower punch. The upper punch is provided with at least one ventilation through hole in the axial direction of the upper punch, the ventilation through holes communicate with the pressing cavity, and the ventilation through holes are used for exhausting air when the upper punch presses the gunpowder grain downwards. The utility model has the beneficial effects that in the extrusion process, air in the pressing chamber is discharged through the ventilating through holes, so that the air in the pressing chamber is prevented from being pressed in the gunpowder grain, and the defects of pores, cracks or loose structure and the like in the gunpowder grain are further prevented.

Description

Technical Field

[0001] This utility model relates to the field of gunpowder production equipment technology, and in particular to a gunpowder pellet pressing mold. Background Technology

[0002] Pyrotechnic agents are chemical agents that produce sound, light, and smoke effects upon combustion, and are widely used in fireworks, signal flares, and other fields. However, in the production process of propellant cartridges for pyrotechnic components, existing propellant cartridge forming molds typically control the upward and downward pressing of the propellant cartridge. However, due to the presence of air within the pressing chamber, this air is forced into the propellant cartridge during pressing. Upon demolding, the gas inside the propellant cartridge expands due to pressure release, leading to defects such as pores, cracks, or loose structures within the cartridge. These defects not only reduce the combustion efficiency of the propellant cartridge but may also cause uneven combustion, accidental explosions, and other safety hazards. Utility Model Content

[0003] Therefore, in view of the above problems, this utility model proposes a gunpowder column pressing mold.

[0004] This utility model is achieved through the following technical solution.

[0005] A gunpowder pellet pressing mold includes an outer mold, with a lower punch and an upper punch disposed inside the outer mold. The upper punch is vertically movable above the lower punch, so that a pressing chamber for accommodating and pressing the gunpowder pellet is formed between the upper punch and the lower punch. The upper punch has at least one vent hole along its axial direction, which is connected to the pressing chamber. The vent hole is used to discharge air when the upper punch presses the gunpowder pellet downwards.

[0006] As a further improvement of this utility model, a breathable block is provided at the bottom of the breathable hole.

[0007] As a further improvement of this utility model, each of the ventilation holes is arranged in a ring array on the upper punch.

[0008] As a further improvement of this utility model, the lower punch is provided with an upwardly extending central column, and the upper punch is provided with a central channel adapted to the central column, the central channel being used by the central column to pass through during the gunpowder pressing process.

[0009] As a further improvement of this utility model, a forming protrusion is provided on the upper side of the lower punch, and the forming protrusion is spirally arranged on the upper end face of the lower punch.

[0010] As a further improvement of this utility model, a limiting end is provided at the lower end of the central column, and a limiting groove that cooperates with the limiting end is provided in the lower punch. A through channel that communicates with the limiting groove is provided above the limiting groove, and the central column passes through the through channel upward.

[0011] As a further improvement of this utility model, a positioning sleeve is provided on the outer mold.

[0012] As a further improvement of this utility model, a base is provided on the lower side of the outer mold, and a first enclosure is provided on the upper periphery of the base to prevent the outer mold from shifting.

[0013] As a further improvement of this utility model, the lower punch outer mold is provided with a mold ejection seat, and a second guard is provided on the upper periphery of the mold ejection seat to prevent the outer mold from shifting.

[0014] As a further improvement of this utility model, the ejector base is provided with a support step for supporting the outer mold, and the ejector base has an ejector cavity for the lower punch to move downward.

[0015] The beneficial effects of this utility model are:

[0016] 1. In the extrusion process, the air in the pressing chamber is discharged through the vent hole, thereby preventing the air in the pressing chamber from being compressed into the gunpowder column, and thus preventing defects such as pores, cracks or loose structure from occurring inside the gunpowder column.

[0017] 2. The air-permeable block blocks the powder within the pressing chamber, and during the pressing process, the air-permeable block simultaneously squeezes the powder downwards, ultimately ensuring that the powder is subjected to uniform force and forms a gunpowder column that meets production requirements. Attached Figure Description

[0018] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of this utility model, wherein:

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model patent;

[0020] Figure 2 This is a schematic diagram of the structure of the gunpowder column when the present utility model patent is pressed;

[0021] Figure 3 This is a schematic diagram of the structure of this utility model patent during mold removal;

[0022] Figure 4 This is a schematic diagram of the gunpowder column structure in this utility model patent.

[0023] The following are the numbered components in the diagram: outer mold 1, lower punch 2, upper punch 3, pressing chamber 4, vent hole 5, vent block 6, center post 7, center channel 8, forming protrusion 9, ignition groove 101, spiral groove 102, limiting end 11, positioning sleeve 12, base 13, first enclosure 14, mold release seat 15, second enclosure 16, mold release cavity 17. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0026] refer to Figures 1 to 4 The present utility model embodiment discloses that:

[0027] A gunpowder pellet pressing mold includes an outer mold 1, which is cylindrical and has an inner cavity for forming. A lower punch 2 and an upper punch 3 are disposed within the outer mold 1. The upper punch 3 is vertically movable above the lower punch 2, forming a pressing chamber 4 between the upper punch 3 and the lower punch 2 to accommodate and press the gunpowder pellet. The upper punch 3 has at least one vent hole 5 along its axial direction, which communicates with the pressing chamber 4. The vent hole 5 allows for the upper punch 3 to press the gunpowder pellet in the direction of its axial direction. Air is expelled when the gunpowder is pressed down. During operation, the powder is first put into the pressing chamber 4, and then the mold is placed on the working surface of the press. The press pushes the upper punch 3 downward, thereby squeezing the powder in the pressing chamber 4 and forming the powder into a gunpowder column. During the extrusion process, the air in the pressing chamber 4 is discharged through the vent hole 5, thereby preventing the air in the pressing chamber 4 from being compressed into the gunpowder column, and thus preventing defects such as pores, cracks or loose structure from occurring inside the gunpowder column.

[0028] However, since the vent hole 5 is opened along the axial direction of the upper punch 3, the loose powder cannot be pressed through the vent hole 5 during the pressing process. Moreover, during the pressing process, the loose powder may also be discharged from the vent hole 5 along with the air, thereby reducing the density of the gunpowder column and failing to meet production requirements. Based on this, in this embodiment, a vent block 6 is provided at the bottom of the vent hole 5. The vent block 6 can be installed at the bottom of the vent hole 5 by means of threaded connection or by means of snap-fit ​​connection. The vent block 6 is a polytetrafluoroethylene vent block, that is, the vent block 6 has a microporous structure with a pore size ranging from 0.02 micrometers to 0.2 micrometers, so that air can pass through the vent block 6 and be discharged into the vent hole 5, while the loose powder is blocked in the pressing chamber 4. During the pressing process, the vent block 6 simultaneously squeezes the loose powder downwards, so that the loose powder can be subjected to uniform force and form a gunpowder column that meets production requirements.

[0029] The ventilation holes 5 are arranged in a ring array on the upper punch 3, so that the air in the pressing chamber 4 can be evenly discharged from each ventilation hole 5.

[0030] The lower punch 2 is provided with an upwardly extending central column 7, and the upper punch 3 has a central channel 8 adapted to the central column 7. The central channel 8 allows the central column 7 to pass through during the gunpowder pressing process. The central column 7 is located in the middle of the lower punch 2, so that after the gunpowder is pressed and formed, the middle of the gunpowder can be formed with an ignition groove 101 as shown in the figure to meet the usage requirements. At the same time, the cooperation between the central column 7 and the central channel 8 can prevent the upper punch 3 from shifting when it moves downward, so that the upper punch 3 can press the powder downward smoothly, thereby making the powder evenly stressed.

[0031] The lower punch 2 is provided with a forming protrusion 9 on its upper side. The forming protrusion 9 is spirally arranged on the upper end face of the lower punch 2 so that a forming groove is formed between adjacent forming protrusions 9, thereby allowing the gunpowder column to form a spiral groove 102 as shown in the figure to meet the usage requirements.

[0032] Furthermore, as shown in the figure, in this embodiment, the central column 7 is detachably mounted on the lower punch 2. Specifically, the lower end of the central column 7 is provided with a limiting end 11, and the lower punch 2 is provided with a limiting groove that cooperates with the limiting end 11. The limiting end 11 can be connected to the limiting groove by a thread or by a snap-fit. A through channel communicating with the limiting groove is provided above the limiting groove, and the central column 7 passes through the through channel from bottom to top.

[0033] A positioning sleeve 12 is provided on the outer mold 1. The positioning sleeve 12 has the same outer diameter as the outer mold 1, is concentric and coaxial, and is connected to the outer mold 1 by a thread or a connector. When the press presses the upper punch 3 downward, the upper punch 3 moves down to a predetermined position, and the pressing device of the press touches the upper end face of the positioning sleeve 12. At this time, the positioning sleeve 12 restricts the pressing device of the press from continuing to descend, that is, the upper punch 3 moves down into place, and the gunpowder column is pressed into shape. Correspondingly, positioning sleeves 12 of different heights can be replaced within a certain range, so that gunpowder columns of different heights can be obtained within a certain range.

[0034] In this embodiment, a base 13 is provided on the lower side of the outer mold 1. The base 13 is installed on the lower side of the outer mold 1 during the pressing of the gunpowder column. A first enclosure 14 is provided on the upper periphery of the base 13. The first enclosure 14 is used to prevent the outer mold 1 from shifting. That is, the outer mold 1 is installed between the first enclosures 14 to prevent the outer mold 1 from shifting during the pressing process, thereby affecting the quality of the gunpowder column.

[0035] In this embodiment, a demolding seat 15 is provided on the lower side of the outer mold 1. The demolding seat 15 is installed on the lower side of the outer mold 1 when demolding is performed after the gunpowder column is pressed and formed. A second baffle 16 is provided on the upper periphery of the demolding seat 15 to prevent the outer mold 1 from shifting. The demolding seat 15 is provided with a support step for supporting the outer mold 1. The demolding seat 15 has a demolding cavity 17 for the lower punch 2 to move downward. During demolding, the positioning sleeve 12 is first removed so that the upper punch 3 can continue to move downward. Then, the demolding seat 15 is installed on the lower side of the outer mold 1 so that the outer mold 1 is located on the support step and the demolding cavity 17 is located on the lower punch 2. At this time, the upper punch 3 is pressed downward by the press. At this time, the lower end of the lower punch 2 is no longer supported and moves downward under force, thus gradually falling into the demolding cavity 17 to achieve demolding.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gunpowder pellet pressing mold, characterized in that: The device includes an outer mold (1), which has a lower punch (2) and an upper punch (3). The upper punch (3) is vertically mounted above the lower punch (2) so that a pressing chamber (4) is formed between the upper punch (3) and the lower punch (2) to accommodate and press the gunpowder column. The upper punch (3) has at least one vent hole (5) along its axial direction. The vent hole (5) is connected to the pressing chamber (4) and is used to discharge air when the upper punch (3) presses the gunpowder column downward.

2. The gunpowder pellet pressing mold according to claim 1, characterized in that: A breathable block (6) is provided at the bottom of the breathable hole (5).

3. The gunpowder pellet pressing mold according to claim 2, characterized in that: Each of the aforementioned vent holes (5) is arranged in a ring array on the upper punch (3).

4. The gunpowder pellet pressing mold according to claim 1, characterized in that: The lower punch (2) is provided with an upwardly extending central column (7), and the upper punch (3) is provided with a central channel (8) adapted to the central column (7). The central channel (8) allows the central column (7) to pass through during the gunpowder pressing process.

5. The gunpowder pellet pressing mold according to claim 4, characterized in that: The lower punch (2) is provided with a forming protrusion (9) on its upper side, and the forming protrusion (9) is spirally arranged on the upper end face of the lower punch (2).

6. The gunpowder pellet pressing mold according to claim 4, characterized in that: The lower end of the central column (7) is provided with a limiting end (11), and the lower punch (2) is provided with a limiting groove that cooperates with the limiting end (11). A through channel connected to the limiting groove is provided above the limiting groove, and the central column (7) passes through the through channel upward.

7. The gunpowder pellet pressing mold according to claim 1, characterized in that: The outer mold (1) is provided with a positioning sleeve (12).

8. The gunpowder pellet pressing mold according to claim 1, characterized in that: A base (13) is provided on the lower side of the outer mold (1), and a first enclosure (14) is provided on the upper periphery of the base (13) to prevent the outer mold (1) from shifting.

9. The gunpowder pellet pressing mold according to claim 1, characterized in that: The outer mold (1) of the lower punch (2) is provided with a mold release seat (15), and a second guard (16) is provided on the upper periphery of the mold release seat (15) to prevent the outer mold (1) from shifting.

10. A gunpowder pellet pressing mold according to claim 9, characterized in that: The ejector base (15) is provided with a support step for supporting the outer mold (1), and the ejector base (15) has an ejector cavity (17) for the lower punch (2) to move downward.

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