Bidirectional explosive pressing mold

Abstract

The utility model relates to the technical field of gunpowder column production equipment, in particular to a bidirectional gunpowder pressing die which comprises a die sleeve, an upper punch and a lower punch are arranged in the die sleeve, the upper punch is movably arranged at the upper end of the die sleeve, so that a pressing cavity used for containing and pressing gunpowder columns is formed between the upper punch and the lower punch, and the lower punch is movably arranged at the lower end of the die sleeve. An explosive pressing limiting piece is detachably arranged between the lower punch and the die sleeve, the explosive pressing limiting piece is used for limiting the distance that the lower punch penetrates into the die sleeve when the gunpowder grain is pressed for the first time, and the explosive pressing limiting piece is detached after the gunpowder grain is pressed for the first time, so that the lower punch can conduct second-time feeding into the pressing cavity to achieve second-time pressing of the gunpowder grain; the gunpowder grain is pressed in two times through upper punching and lower punching, and the gunpowder grain is pressed in two times through the gunpowder grain upper end and the gunpowder grain lower end, so that the density of the gunpowder grain formed through pressing is more uniform than that of a gunpowder grain formed through single-time pressing, and the detonation performance of the gunpowder grain is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of gunpowder column production equipment, and in particular to a bidirectional 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. Among existing propellant forming technologies, compression molding is widely used in propellant preparation due to its high efficiency and controllability of detonation performance. This process achieves propellant forming through the radial constraint of the die and the axial pressure of the upper and lower punches, making it particularly suitable for conventional propellant structures. However, in the preparation of irregularly shaped or large-sized propellant charges, the traditional unidirectional compression process has significant limitations. Due to the uneven transmission of axial pressure, the flowability of propellant particles in complex regions such as thin walls and high curvature is restricted, leading to a significant density gradient within the propellant charge. Furthermore, as the size of the propellant increases, this uneven density distribution becomes increasingly pronounced, severely affecting the detonation performance of the charge. Utility Model Content

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

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

[0005] A bidirectional pressing die includes a die sleeve with an upper punch and a lower punch inside. The upper punch is movably disposed at the upper end of the die sleeve, forming a pressing chamber between the upper punch and the lower punch for accommodating and pressing a gunpowder pellet. The lower punch is movably disposed at the lower end of the die sleeve. A pressing limiting member is detachably disposed between the lower punch and the die sleeve. The pressing limiting member is used to limit the distance the lower punch penetrates into the die sleeve during the initial pressing of the gunpowder pellet. The pressing limiting member is detached after the initial pressing of the gunpowder pellet, allowing the lower punch to be fed into the pressing chamber a second time to achieve a second pressing of the gunpowder pellet.

[0006] As a further improvement of this utility model, the drug-pressing limiting member includes at least two limiting assembly bodies, which are used to assemble with each other into a circular structure.

[0007] As a further improvement of this utility model, a mold release limiting member is detachably provided between the pressing limit member and the mold sleeve or the lower punch. The mold release limiting member is used to be disassembled after the second pressing of the gunpowder column, so that the lower punch can be fed into the pressing chamber again for mold release.

[0008] As a further improvement of this utility model, the mold release limiting component includes at least two mold release assembly bodies, which are used to assemble a circular structure with each other.

[0009] As a further improvement of this utility model, the thickness of the mold release limiting member is greater than the thickness of the drug pressing limiting member.

[0010] As a further improvement of this utility model, it also includes a guide sleeve, which is used to be installed on the upper end of the mold sleeve when pressing the gunpowder column. The upper punch sidewall is provided with a limiting boss, which is used to abut against the guide sleeve when the upper punch advances into the pressing chamber to a predetermined distance, so as to limit the upper punch from continuing to advance into the pressing chamber.

[0011] As a further improvement of this utility model, it also includes a demolding pad, which is used to be installed on the upper end of the mold sleeve during demolding.

[0012] As a further improvement of this utility model, the upper end of the mold sleeve is provided with a mounting platform, and the lower ends of the guide sleeve and the mold release pad are both provided with mounting grooves adapted to the mounting platform.

[0013] As a further improvement of this utility model, both the upper punch and the lower punch are provided with a tapered pressing part.

[0014] The beneficial effects of this utility model are as follows: In this utility model patent, the gunpowder column can be pressed in two stages by an upward and downward punch, and the two punches are respectively pressed from the upper end and the lower end of the gunpowder column. This makes the density of the pressed gunpowder column more uniform than that of the gunpowder column formed by a single pressing, thereby improving the detonation performance of the gunpowder column. Attached Figure Description

[0015] 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:

[0016] Figure 1 This is a schematic diagram of the structure of the powdered medicine in an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure during the first pressing and molding of this utility model embodiment;

[0018] Figure 3 This is a schematic diagram of the structure when disassembling the drug-pressing limiting component in an embodiment of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure during the second pressing and molding process of this utility model embodiment;

[0020] Figure 5This is a schematic diagram of the structure when disassembling the mold release limiting component in an embodiment of this utility model;

[0021] Figure 6 This is a schematic diagram of the structure during demolding in an embodiment of this utility model.

[0022] The following are the numbered components in the diagram: 1. Mold sleeve; 2. Upper punch; 201. Limiting boss; 3. Lower punch; 4. Gunpowder column; 5. Pressing limit component; 6. Ejection limit component; 7. Guide sleeve; 8. Ejection pad; 9. Mounting platform; 10. Conical pressing part. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0024] refer to Figures 1 to 6The present invention discloses a bidirectional gunpowder pressing mold, comprising a mold sleeve 1, wherein an upper punch 2 and a lower punch 3 are disposed within the mold sleeve 1. The upper punch 2 is movably disposed at the upper end of the mold sleeve 1, such that a pressing chamber for accommodating and pressing gunpowder pellets 4 is formed between the upper punch 2 and the lower punch 3. The lower punch 3 is movably disposed at the lower end of the mold sleeve 1. In this embodiment, the lower punch 3 has a multi-stage annular stepped structure with decreasing diameter, and the diameter of its lowest end is larger than the inner diameter of the mold sleeve 1. That is, the lowest end of the lower punch 3 penetrates into the pressing chamber at its upper end. The lower punch 3 abuts against the lower end of the mold sleeve 1. A detachable pressing limiter 5 is provided between the lower punch 3 and the mold sleeve 1. The pressing limiter 5 is used to limit the distance the lower punch 3 penetrates into the mold sleeve 1 during the initial pressing of the gunpowder column 4. The pressing limiter 5 is removed after the initial pressing of the gunpowder column 4, so that the lower punch 3 can be fed into the pressing chamber a second time to achieve the second pressing of the gunpowder column 4. In this embodiment, when pressing the gunpowder column 4, the lower punch 3 is first controlled to penetrate into the pressing chamber from bottom to top, and then the powder is poured into the pressing chamber. Then, control the upper punch 2 to penetrate into the pressing chamber from top to bottom. Finally, place the entire mold onto the pressing table of the one-way press, so that the output end of the one-way press cooperates with the upper end of the upper punch 2, driving the upper punch 2 to feed from top to bottom (at this time, the upper punch 2 has been fed into place and can no longer continue to feed from top to bottom), so as to initially compress the loose powder into gunpowder column 4; after the initial compression of the gunpowder column 4, the pressing limit member 5 is removed, so that the lower punch 3 can feed into the pressing chamber a certain distance (i.e., the thickness of the pressing limit member 5). At this time, control the single... The upper punch 2 moves downwards towards the output end of the press. At this time, since the upper punch 2 has reached its feeding position, it can no longer continue to feed downwards. Meanwhile, the lower punch 3 can feed upwards from the bottom, so that the lower punch 3 is forced to feed the compressed gunpowder column 4 into the compression chamber. Through the above settings, this embodiment can compress the gunpowder column 4 in two stages through the upper punch 2 and the lower punch 3, and the two stages are respectively compressed from the upper end and the lower end of the gunpowder column 4. This makes the density of the compressed gunpowder column 4 more uniform than that of the gunpowder column 4 compressed in a single stage, thereby improving the detonation performance of the gunpowder column 4.

[0025] In this embodiment, the pressing limiter 5 is sleeved on the lower punch 3, with its upper end face abutting the lower end face of the mold sleeve 1 and its lower end face abutting the upper surface of the lowest end of the lower punch 3, which has an annular stepped structure. The pressing limiter 5 includes at least two limiting assembly bodies, which are used to assemble with each other into a circular structure. In this embodiment, specifically, there are two semi-circular limiting assembly bodies to facilitate installation and disassembly.

[0026] A mold release limiter 6 is detachably provided between the pressing limiter 5 and the mold sleeve 1 or the lower punch 3. The mold release limiter 6 is used to be removed after the second pressing of the gunpowder column 4, so that the lower punch 3 can be fed into the pressing chamber again for mold release; that is, after the lower punch 3 in this mold is pressed into the gunpowder column, the mold release limiter 6 can be removed to allow mold release feed and realize the mold release operation.

[0027] Similar to the principle of the pressure limiting member 5, the ejection limiting member 6 is also sleeved on the lower punch 3. The ejection limiting member 6 includes at least two ejection assembly bodies, which are used to assemble a circular structure with each other to facilitate installation and disassembly.

[0028] The thickness of the ejection limiting member 6 is greater than the thickness of the pressing limiting member 5, ensuring that the feed amount of the lower punch 3 increases during the second pressing and during ejection, thus avoiding excessive compression or difficulty in demolding.

[0029] It also includes a guide sleeve 7, which is used to be installed on the upper end of the mold sleeve 1 when pressing the gunpowder column 4. The side wall of the upper punch 2 is provided with a limiting boss 201. The limiting boss 201 is used to abut against the guide sleeve 7 when the upper punch 2 advances into the pressing chamber to a predetermined distance, so as to limit the upper punch 2 from continuing to advance into the pressing chamber. The guide sleeve 7 ensures that the upper punch 2 also moves in a vertical direction. At the same time, the limiting boss 201 controls the initial pressing depth of the upper punch 2.

[0030] It also includes a demolding pad 8, which is used to be installed on the upper end of the mold sleeve 1 during demolding; during demolding, the demolding pad 8 replaces the guide sleeve 7 to assist the gunpowder column 4 to be completely removed.

[0031] The upper end of the mold sleeve 1 is provided with an installation platform 9, and the lower ends of the guide sleeve 7 and the mold release pad 8 are both provided with installation grooves that are adapted to the installation platform 9. The guide sleeve 7 / mold release pad 8 are installed through the installation grooves to achieve quick replacement, reduce equipment debugging time, and improve production efficiency.

[0032] Both the upper punch 2 and the lower punch 3 are provided with a conical pressing part 10. During the pressing process, the conical structure guides the flow of powder, reduces pressing pores, and reduces the resistance during demolding (the resistance when the gunpowder column 4 separates from the upper punch 2 and the lower punch 3).

[0033] Working principle:

[0034] refer to Figure 1When the mold is filled with loose medicine, the lower end of the mold sleeve 1 is inserted into the lower punch 3, and a pressing limiter 5 and a mold withdrawal limiter 6 are provided between the lower punch 3 and the mold sleeve 1. A guide sleeve 7 is installed at the upper end, and the upper punch 2 is inserted into the guide sleeve 7 and the mold sleeve 1 from top to bottom. Loose medicine is poured into the pressing chamber formed between the upper punch 2 and the lower punch 3. At this time, the upper punch 2 is not fed downwards under force, and there is a gap between the limiting boss 201 and the upper end of the guide sleeve 7.

[0035] refer to Figure 2 During the first pressing and forming, the output end of the unidirectional press cooperates with the upper end of the upper punch 2, driving the upper punch 2 to feed from top to bottom. When the limiting boss 201 and the upper end of the guide sleeve 7 abut against each other, the upper punch 2 is fed into place and can no longer continue to feed from top to bottom, and the gunpowder column 4 is initially pressed and formed.

[0036] refer to Figure 3 , Figure 4 The pressing limiter 5 is disassembled, and the output end of the one-way press is controlled to move downward. Since the upper punch 2 has been fed into place, it can no longer continue to feed downward. At the same time, since the forces are mutual, the lower punch 3 can feed upward again, so that the lower punch 3 is forcefully fed into the pressing chamber to press the gunpowder column 4 for the second time. Of course, the mold can also be removed and then placed upside down on the worktable so that the output end of the one-way press directly acts on the lower punch 3, which can also achieve the second feeding and pressing of the gunpowder column 4.

[0037] refer to Figure 5 , Figure 6 After the second pressing of the gunpowder column 4, the ejection limiter 6, guide sleeve 7 and upper punch 2 are disassembled, and the ejection pad 8 is installed on the upper end of the mold sleeve 1. At the same time, the output end of the one-way press is controlled to act on the upper surface of the ejection pad 8. At this time, the lower punch 3 is forcefully fed into the pressing chamber again. At this time, the gunpowder column 4 is no longer acted on by the upper punch 2, and can move upward and leave the pressing chamber under the action of the lower punch 3, thereby realizing the ejection.

[0038] 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 bidirectional pressing mold, comprising a mold sleeve (1), wherein an upper punch (2) and a lower punch (3) are disposed within the mold sleeve (1), the upper punch (2) being movably disposed at the upper end of the mold sleeve (1) such that a pressing chamber for accommodating and pressing a gunpowder column (4) is formed between the upper punch (2) and the lower punch (3), characterized in that: The lower punch (3) is movably disposed at the lower end of the mold sleeve (1). A pressing limit member (5) is detachably disposed between the lower punch (3) and the mold sleeve (1). The pressing limit member (5) is used to limit the distance by which the lower punch (3) penetrates into the mold sleeve (1) when the gunpowder column (4) is pressed for the first time. The pressing limit member (5) is disassembled after the gunpowder column (4) is pressed for the first time, so that the lower punch (3) can be fed into the pressing chamber for the second time to achieve the second pressing of the gunpowder column (4).

2. The bidirectional compression mold according to claim 1, characterized in that: The drug-pressing limiting component (5) includes at least two limiting assembly bodies, which are used to assemble into a circular structure.

3. The bidirectional compression mold according to claim 1, characterized in that: A mold release limiter (6) is detachably provided between the pressing limiter (5) and the mold sleeve (1) or the lower punch (3). The mold release limiter (6) is used to be disassembled after the second pressing of the gunpowder column (4) so ​​that the lower punch (3) can be fed into the pressing chamber again for mold release.

4. The bidirectional compression mold according to claim 3, characterized in that: The ejection limiting component (6) includes at least two ejection assembly parts, which are used to assemble a circular structure with each other.

5. The bidirectional compression mold according to claim 3, characterized in that: The thickness of the mold release limiting member (6) is greater than the thickness of the drug pressing limiting member (5).

6. The bidirectional compression mold according to claim 1, characterized in that: It also includes a guide sleeve (7), which is used to be installed on the upper end of the mold sleeve (1) when pressing the gunpowder column (4). The side wall of the upper punch (2) is provided with a limiting boss (201), which is used to abut against the guide sleeve (7) when the upper punch (2) is fed into the pressing chamber to a predetermined distance, so as to limit the upper punch (2) from continuing to feed into the pressing chamber.

7. The bidirectional compression mold according to claim 6, characterized in that: It also includes a demolding pad (8), which is used to be installed on the upper end of the mold sleeve (1) during demolding.

8. The bidirectional compression mold according to claim 7, characterized in that: The upper end of the mold sleeve (1) is provided with a mounting platform (9), and the lower ends of the guide sleeve (7) and the mold release pad (8) are both provided with mounting grooves adapted to the mounting platform (9).

9. A bidirectional drug-pressing mold according to claim 1, characterized in that: Both the upper punch (2) and the lower punch (3) are provided with a conical pressing part (10).

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