Rubber sleeve sealing die for isostatic pressing

Abstract

The utility model belongs to the technical field of explosive column pressing production, and particularly relates to a rubber sleeve sealing mold for isostatic pressing. According to the technical scheme, the rubber sleeve sealing die for isostatic pressing comprises a die sleeve, explosive powder is contained in the die sleeve, punches are arranged in the two ends of the die sleeve, vulcanized rubber rings are arranged between the punches and the inner wall of the die sleeve, the two ends of the die sleeve are further sleeved with forming sealing rubber sleeves, and the middles of the forming sealing rubber sleeves are tightly attached to the end faces of the punches. The utility model provides a rubber sleeve sealing die for isostatic pressing. The rubber sleeve sealing die solves the sealing problem in the pressing process of explosive grains.

Description

Technical Field

[0001] The utility model belongs to the technical field of explosive column pressing production, in particular to a rubber sleeve sealing mould for isostatic pressing. Background Art

[0002] Due to the unique nature of the raw materials, traditional explosives are pressed using die-cut dies, resulting in low production efficiency and limited production of single shots at a time. The die is bulky and heavy due to the application of force from both ends. Furthermore, the coaxiality and parallelism of the upper and lower dies can lead to uneven pressing forces and unstable product quality. The isostatic pressing process for explosives allows for the production of multiple shots at a time, while also providing balanced pressing forces, stable quality, and a lightweight die.

[0003] However, it has always been difficult to achieve safe and reliable high-pressure sealing when isostatic pressing is used to press explosive products, which has long hindered the application of isostatic pressing technology in the field of explosives. Utility Model Content

[0004] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a rubber sleeve sealing mold for isostatic pressing, which solves the sealing problem in the pressing of explosive powder columns.

[0005] The technical solution adopted by this utility model is:

[0006] A rubber sleeve sealing mold for isostatic pressing comprises a mold sleeve filled with explosive powder, punches are provided at both ends of the mold sleeve, vulcanized rubber rings are provided between the punches and the inner wall of the mold sleeve, and molded sealing rubber sleeves are also provided at both ends of the mold sleeve, the middle part of the molded sealing rubber sleeve is in close contact with the end face of the punch.

[0007] When the product is pressed, the powder particles are encapsulated in the die sleeve through the upper and lower punches, and then sealed with a molded sealing rubber sleeve on the punch. Finally, the whole is immersed in high-pressure liquid. By continuously increasing the liquid pressure, the punches are pushed to the middle to squeeze and press the powder into shape.

[0008] The molded sealing rubber sleeve tightly wraps the die sleeve and the punch. A nitrile rubber ring is vulcanized on the outer ring of the upper end surface of the punch.

[0009] The hydraulic seal of the punch of the utility model adopts a double sealing method of sealing the molded sealing rubber sleeve and the vulcanized rubber ring on the punch. During operation, the liquid pressure acts on the molded sealing rubber sleeve from all directions, and while pushing the punch downward, it also presses the molded sealing rubber sleeve tightly against the wall of the mold sleeve to form a sealing surface. The greater the liquid pressure, the tighter the sealing surface fits, achieving high-pressure sealing. The entire punch is pressed downward by the thrust of the molded sealing rubber sleeve. At the same time, the rubber ring on the punch is deformed by the pressure of the molded sealing rubber sleeve, expanding outward and tightly against the inner wall of the mold sleeve to form a double sealing surface. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, achieving ultra-high-pressure sealing.

[0010] As a preferred solution of the present invention, the molded sealing rubber sleeve is fastened to the outer wall of the mold sleeve by a clamping hoop, thereby preventing the rubber sleeve from falling off the mold sleeve.

[0011] As a preferred solution of the present invention, a boss is provided in the middle of the molded sealing rubber sleeve, and a vacuum air passage is provided in the boss. When vacuuming, a vacuum needle is inserted into the vacuum air passage of the boss to vacuum the inner cavity of the mold sleeve.

[0012] As a preferred solution of the present invention, after the mold sleeve is vacuumed, the protruding column is fastened with a cable tie. Due to the arrangement of the protruding column, the protruding column can be fastened with a cable tie after vacuuming to prevent air leakage.

[0013] As a preferred embodiment of the present invention, a connecting airway is provided within the punch, one end of which communicates with a vacuum duct, and the other end of which communicates with the space within the mold sleeve filled with explosive powder. During vacuuming, the vacuum needle draws air from the vacuum duct, and the air within the powder area of ​​the mold sleeve enters the vacuum duct through the connecting airway and is then drawn away, thereby achieving vacuuming of the mold sleeve cavity.

[0014] As a preferred embodiment of the present invention, the connecting air passage comprises interconnected longitudinal and transverse air passages. The ends of the longitudinal air passages communicate with the vacuum duct on the protruding column, while the transverse air passages communicate with the space within the die sleeve filled with explosive powder. A gap is provided between the punch and the inner wall of the die sleeve, allowing gas from the explosive powder area to pass through the gap into the transverse air passage, and then from the longitudinal air passage into the vacuum duct within the protruding column. The transverse air passages do not directly communicate with the explosive powder area; instead, gas enters the transverse air passages through the annular sidewall of the punch, preventing the explosive powder from being drawn away.

[0015] As a preferred solution of the present invention, the opening of the transverse airway on the punch is located on the side of the vulcanized rubber ring close to the explosive powder. During the vacuuming process, the vulcanized rubber ring is always in close contact with the inner wall of the mold sleeve to ensure reliable sealing.

[0016] As a preferred solution of the present invention, a mounting step is provided on the circumferential surface of the punch at one end away from the explosive powder, and the vulcanized rubber ring is provided on the mounting step.

[0017] The vulcanized rubber ring seals the gap between the punch and the die sleeve. During operation, the entire punch is pressed downward by the thrust of the molded sealing rubber sleeve. At the same time, the vulcanized rubber ring on the punch is deformed by the pressure of the molded sealing rubber sleeve, expanding outward and tightly against the inner wall of the die sleeve to form a double sealing surface. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, achieving ultra-high pressure sealing.

[0018] As a preferred solution of the present invention, the material of the vulcanized rubber ring is a nitrile rubber ring.

[0019] As a preferred solution of the present invention, the material of the molded sealing rubber sleeve is flexible nitrile rubber.

[0020] The beneficial effects of the utility model are:

[0021] The hydraulic seal of the punch of the utility model adopts a double sealing method of sealing the molded sealing rubber sleeve and the vulcanized rubber ring on the punch. During operation, the liquid pressure acts on the molded sealing rubber sleeve from all directions, and while pushing the punch downward, it also presses the molded sealing rubber sleeve tightly against the wall of the mold sleeve to form a sealing surface. The greater the liquid pressure, the tighter the sealing surface fits, achieving high-pressure sealing. The entire punch is pressed downward by the thrust of the molded sealing rubber sleeve. At the same time, the rubber ring on the punch is deformed by the pressure of the molded sealing rubber sleeve, expanding outward and tightly against the inner wall of the mold sleeve to form a double sealing surface. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, achieving ultra-high-pressure sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the utility model;

[0023] Figure 2 This is a sealing principle diagram of the utility model;

[0024] Figure 3 A top view of the utility model;

[0025] Figure 4 It is a cross-sectional view of the punch.

[0026] In the figure: 1-mold sleeve; 2-explosive powder; 3-punch; 4-vulcanized rubber ring; 5-molded sealing rubber sleeve; 6-clamp; 31-longitudinal air channel; 32-transverse air channel; 51-convex column; 52-vacuum air channel. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without inventive effort are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features therein may be combined with each other unless there is a conflict.

[0029] like Figures 1 to 4 As shown, the isostatic pressing rubber sleeve sealing mold of this embodiment includes a mold sleeve 1, which is filled with explosive powder 2, and punches 3 are provided at both ends of the mold sleeve 1. A vulcanized rubber ring 4 is provided between the punch 3 and the inner wall of the mold sleeve 1, and a molded sealing rubber sleeve 5 is also provided at both ends of the mold sleeve 1. The middle part of the molded sealing rubber sleeve 5 is tightly attached to the end face of the punch 3.

[0030] When the product is pressed, the powder particles are encapsulated in the die sleeve 1 through the upper and lower punches 3, and then sealed with a molded sealing rubber sleeve 5 on the punch 3. Finally, the whole is immersed in high-pressure liquid. By continuously increasing the liquid pressure, the punches are pushed toward the middle to squeeze and press the powder into shape.

[0031] The molded sealing rubber sleeve 5 tightly wraps the die sleeve 1 and the punch 3. The outer ring of the upper end surface of the punch 3 is vulcanized with a circle of nitrile rubber ring.

[0032] The hydraulic seal of the punch 3 of the present invention adopts a double sealing method of sealing the molded sealing rubber sleeve 5 and the vulcanized rubber ring 4 on the punch 3. During operation, liquid pressure acts on the molded sealing rubber sleeve 5 from all directions, and while pushing the punch 3 downward, it also presses the molded sealing rubber sleeve 5 tightly against the wall of the mold sleeve 1 to form a sealing surface. The greater the liquid pressure, the tighter the sealing surface fits, achieving a high-pressure seal. The entire punch 3 is pushed downward by the thrust of the molded sealing rubber sleeve 5. At the same time, the rubber ring on the punch 3 is deformed by the pressure of the molded sealing rubber sleeve 5, expanding outward and tightly against the inner wall of the mold sleeve 1 to form a double sealing surface. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, achieving an ultra-high-pressure seal.

[0033] like Figure 2 As shown, P is the pressure on the molded sealing rubber sleeve 5, and δ is the pressure on the vulcanized rubber ring 4.

[0034] Furthermore, the molded sealing rubber sleeve 5 is fastened to the outer wall of the mold sleeve 1 by a clamp 6. The rubber sleeve and the mold sleeve 1 are fastened by the clamp 6 to prevent the rubber sleeve from falling off the mold sleeve 1.

[0035] Furthermore, a boss 51 is provided in the middle of the molded sealing rubber sleeve 5, and a vacuum air passage 52 is provided in the boss 51. When vacuuming, a vacuum needle is inserted into the vacuum air passage 52 of the boss 51, and then the inner cavity of the mold sleeve 1 is vacuumed.

[0036] After the mold sleeve 1 is vacuumed, the boss 51 is fastened with a cable tie. Due to the arrangement of the boss 51, the boss 51 can be fastened with a cable tie after vacuuming to prevent air leakage.

[0037] The punch 3 is provided with a communicating air passage, one end of which is connected to the vacuum passage 52, and the other end of which is connected to the space filled with explosive powder 2 in the mold sleeve 1. During vacuuming, the vacuum needle draws air from the vacuum passage 52, and the gas in the powder area of ​​the mold sleeve 1 enters the vacuum passage 52 through the communicating air passage and is then drawn away, thereby achieving vacuuming of the interior of the mold sleeve 1.

[0038] Specifically, the communicating air passages include a longitudinal air passage 31 and a transverse air passage 32, which are interconnected. The end of the longitudinal air passage 31 communicates with a vacuum duct 52 on a boss 51, while the transverse air passage 32 communicates with the space within the die sleeve 1 filled with explosive powder 2. A gap exists between the punch 3 and the inner wall of the die sleeve 1, allowing gas from the area of ​​explosive powder 2 to enter the transverse air passage 32 through this gap, and then enter the vacuum duct 52 within the boss 51 from the longitudinal air passage 31. The transverse air passage 32 does not directly communicate with the area of ​​explosive powder 2. Instead, gas enters the transverse air passage 32 through the annular sidewall of the punch 3, preventing the explosive powder 2 from being withdrawn.

[0039] The opening of the transverse air passage 32 on the punch 3 is located on the side of the vulcanized rubber ring 4 close to the explosive powder 2. During the vacuuming process, the vulcanized rubber ring 4 is always in close contact with the inner wall of the die sleeve 1 to ensure reliable sealing.

[0040] An installation step is provided on the circumferential surface of the punch 3 at one end away from the explosive powder 2, and the vulcanized rubber ring 4 is provided on the installation step.

[0041] The vulcanized rubber ring 4 seals the gap between the punch 3 and the die sleeve 1. During operation, the entire punch 3 is pressed downward by the thrust of the molded sealing rubber sleeve 5. At the same time, the vulcanized rubber ring 4 on the punch 3 is deformed by the pressure of the molded sealing rubber sleeve 5, and expands outward to tightly fit the inner wall of the die sleeve 1 to form a double sealing surface. The greater the liquid pressure, the greater the deformation, and the tighter the sealing surface fits, achieving ultra-high pressure sealing.

[0042] The material of the vulcanized rubber ring 4 is a nitrile rubber ring.

[0043] The material of the molded sealing rubber sleeve 5 is flexible nitrile rubber.

[0044] The present invention is not limited to the above-mentioned optional implementation methods. Anyone can derive various other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that falls within the scope defined by the claims of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A rubber sleeve sealing mold for isostatic pressing, characterized in that: The invention comprises a die sleeve (1), wherein explosive powder (2) is filled in the die sleeve (1), punches (3) are arranged in both ends of the die sleeve (1), a vulcanized rubber ring (4) is arranged between the punches (3) and the inner wall of the die sleeve (1), and a molded sealing rubber sleeve (5) is also sleeved on both ends of the die sleeve (1), and the middle part of the molded sealing rubber sleeve (5) is tightly attached to the end surface of the punch (3).

2. The isostatic pressing rubber sleeve sealing mold according to claim 1, characterized in that: The molded sealing rubber sleeve (5) and the outer wall of the mold sleeve (1) are fastened together by a clamp (6).

3. The isostatic pressing rubber sleeve sealing mold according to claim 1, characterized in that: A convex column (51) is provided in the middle of the molded sealing rubber sleeve (5), and a vacuum air duct (52) is provided in the convex column (51).

4. The isostatic pressing rubber sleeve sealing mold according to claim 3, characterized in that: After the mold sleeve (1) is vacuumed, the protruding column (51) is fastened with a cable tie.

5. The isostatic pressing rubber sleeve sealing mold according to claim 4, characterized in that: A communicating air passage is provided in the punch (3), one end of the communicating air passage is communicated with the vacuum air passage (52), and the other end of the communicating air passage is communicated with the space filled with explosive powder (2) in the die sleeve (1).

6. The isostatic pressing rubber sleeve sealing mold according to claim 5, characterized in that: The communicating air passage comprises a longitudinal air passage (31) and a transverse air passage (32) that are communicated with each other. The end of the longitudinal air passage (31) is communicated with a vacuum air passage (52) on a protruding column (51), and the transverse air passage (32) is communicated with a space filled with explosive powder (2) in the mold sleeve (1).

7. The isostatic pressing rubber sleeve sealing mold according to claim 6, characterized in that: The opening of the transverse air passage (32) on the punch (3) is located on the side of the vulcanized rubber ring (4) close to the explosive powder (2).

8. The isostatic pressing rubber sleeve sealing mold according to claim 1, characterized in that: An installation step is provided on the circumferential surface of the punch (3) at one end away from the explosive powder (2), and a vulcanized rubber ring (4) is provided on the installation step.

9. The isostatic pressing rubber sleeve sealing mold according to claim 1, characterized in that: The material of the vulcanized rubber ring (4) is a nitrile rubber ring.

10. The isostatic pressing rubber sleeve sealing mold according to any one of claims 1 to 9, characterized in that: The material of the molded sealing rubber sleeve (5) is flexible nitrile rubber.

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