Oil press-based grain isostatic pressing system and method

Abstract

The invention belongs to the technical field of explosive grain pressing production, and particularly relates to a grain isostatic pressing forming system and method based on an oil press. The system comprises a press middle fixing workbench, a high-pressure cylinder body is installed in the press middle fixing workbench, a high-pressure cylinder upper sealing head is arranged on the upper side of the high-pressure cylinder body, the high-pressure cylinder upper sealing head is connected with an upper oil pressure mechanism, a high-pressure cylinder lower sealing head is arranged on the lower side of the high-pressure cylinder body, and the high-pressure cylinder lower sealing head is connected with a lower oil pressure mechanism; the oil supply tank is connected with a supercharger through an oil inlet pipeline, the supercharger is connected with a liquid confluence valve, the liquid confluence valve is connected with the high-pressure cylinder lower sealing head, and the high-pressure cylinder upper sealing head is connected with the oil supply tank through an oil return pipeline; a plurality of product hanging baskets are arranged in the high-pressure cylinder body, and a plurality of filled product molds are arranged in the product hanging baskets. The invention provides a grain isostatic pressing forming system and method based on an oil press.

Description

Technical Field

[0001] The invention belongs to the technical field of explosive column pressing production, and in particular relates to an isostatic pressing molding system and method of explosive columns based on an oil press. Background Art

[0002] Due to the particularity of the raw materials, traditional pyrotechnic powder columns are pressed using a hydraulic press matched with a molding die, which has low production efficiency and can only be pressed one shot at a time. During pressing, the hydraulic press is used to apply force up and down, resulting in a large size and weight of the mold. At the same time, it is restricted by the coaxiality and parallelism of the upper and lower molds, as well as the low control accuracy of large hydraulic presses, which may result in uneven pressing force and unstable product quality. Summary of the invention

[0003] In order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a system and method for isostatic pressing of explosive columns based on a hydraulic press. The isostatic pressing process of explosive columns can achieve multiple production at one time. At the same time, the product is subjected to all-round force, so that the force is balanced, the quality is stable, and the mold is light.

[0004] The technical solution adopted by the present invention is:

[0005] A medicine column isostatic pressing system based on an oil hydraulic press comprises a fixed workbench in the middle of the press, a high-pressure cylinder body is installed in the fixed workbench in the middle of the press, a high-pressure cylinder upper head is arranged on the upper side of the high-pressure cylinder body, the upper head of the high-pressure cylinder is connected to an upper oil pressure mechanism, a low head of the high-pressure cylinder is arranged on the lower side of the high-pressure cylinder body, the low head of the high-pressure cylinder is connected to a lower oil pressure mechanism; it also comprises an oil supply tank, the oil supply tank is connected to a supercharger through an oil inlet pipeline, the supercharger is connected to a liquid confluence valve through a pipeline, the liquid confluence valve is connected to the lower head of the high-pressure cylinder through a pipeline, the liquid confluence valve is connected to the interior of the high-pressure cylinder body through the lower head of the high-pressure cylinder, the upper head of the high-pressure cylinder is connected to the oil supply tank through an oil return pipeline, the oil return pipeline is connected to the interior of the high-pressure cylinder body through the upper head of the high-pressure cylinder; a plurality of product hanging baskets are arranged in the high-pressure cylinder body, and a plurality of filled product molds are installed in the product hanging baskets.

[0006] Place the filled product mold into the product hanging basket, and place several product hanging baskets into the high-pressure cylinder. The upper and lower heads of the high-pressure cylinder are pressed together with the high-pressure cylinder through the upper and lower oil pressure mechanisms, and a certain pre-pressure is applied. The oil supply tank and the oil temperature heating box circulate oil and heat the high-pressure cylinder. When the heating reaches the set state, the booster begins to pressurize the high-pressure cylinder through the liquid confluence valve. Maintain the set oil pressure for a certain period of time to achieve isostatic pressing of the drug column.

[0007] The filled product mold includes a mold sleeve, which is filled with vacuumized explosives, and the two ends of the mold sleeve are sealed with an upper punch and a lower punch respectively. The product mold is placed in a product hanging basket as a whole, and then the product hanging basket is placed in a high-pressure cylinder. After the hydraulic oil in the high-pressure cylinder is pressurized, the high-pressure oil squeezes the explosives from the upper punch and the lower punch. Since the product mold is set in the high-pressure cylinder as a whole, the oil pressure on the upper punch and the lower punch is always consistent, thereby realizing isostatic pressing of the explosives.

[0008] The present invention combines the traditional hydraulic press system with the isostatic pressing process and is applied to the production of military explosive column pressing. The isostatic pressing process of explosive column pressing can achieve multiple production at one time, and the product pressing force is omnidirectional, so that the force is balanced, the quality is stable, and the mold is light.

[0009] As a preferred embodiment of the present invention, the liquid confluence valve is connected to a proportional pressure relief valve through a pipeline, and the proportional pressure relief valve is connected to the oil return pipeline through a pressure relief pipeline. After the medicine column is isostatically pressed, the pressure of the hydraulic oil in the high-pressure cylinder is relatively high, and the oil cannot be directly unloaded through the oil return pipeline. When unloading the oil, the high-pressure oil in the high-pressure cylinder is first slowly and safely released through the proportional pressure relief valve, and the remaining oil is recovered to the oil supply tank through the oil return pipeline after the pressure is balanced.

[0010] As a preferred solution of the present invention, an oil temperature heating box is connected to the oil inlet pipeline. After the upper oil pressure mechanism and the lower oil pressure mechanism respectively press the upper head and the lower head of the high-pressure cylinder, the high-pressure cylinder body is first circulated with oil and circulated heated through the oil supply box and the oil temperature heating box, so that the oil temperature reaches the set state, ensuring that the high-pressure oil acts better on the upper head and the lower head of the high-pressure cylinder.

[0011] As a preferred solution of the present invention, the upper oil pressure mechanism includes a press top seat, the press top seat is provided with an upper oil pressure cylinder, the upper oil pressure cylinder is provided with an upper pressure column, the other end of the upper pressure column is connected to the press upper slide, and the press upper slide presses the upper head of the high-pressure cylinder. After the upper oil pressure cylinder is filled with hydraulic oil, the upper pressure column is pushed out, the upper pressure column pushes the press upper slide to move, and the press upper slide presses the upper head of the high-pressure cylinder and the high-pressure cylinder body.

[0012] As a preferred solution of the present invention, the lower hydraulic mechanism includes a press base, the press base is provided with a lower hydraulic cylinder, the lower hydraulic cylinder is provided with a lower pressure column, the other end of the lower pressure column is connected to a lower slide of the press, and the lower slide of the press presses the lower head of the high-pressure cylinder. After the hydraulic oil is filled in the lower hydraulic cylinder, the lower pressure column is pushed out, and the lower pressure column pushes the lower slide of the press to move, and the lower slide of the press presses the lower head of the high-pressure cylinder and the high-pressure cylinder body.

[0013] As a preferred solution of the present invention, a hanging platform is provided on the upper end cover of the high-pressure cylinder, and a hook is provided on the uppermost product hanging basket, which is hung on the hanging platform. The hook on the uppermost product hanging basket is hung on the hanging platform of the upper end cover of the high-pressure cylinder to ensure that a plurality of product hanging baskets are stably installed in the high-pressure cylinder body.

[0014] As a preferred solution of the present invention, a gap is left between the bottom of the bottom product basket and the lower head of the high-pressure cylinder to ensure that the high-pressure oil can flow freely in the high-pressure cylinder, to ensure that the oil pressure at various locations in the high-pressure cylinder is the same, and to facilitate oil return. A sensor is provided in the high-pressure cylinder to avoid interference when a gap is left between the bottom of the bottom product basket and the lower head of the high-pressure cylinder.

[0015] As a preferred solution of the present invention, the high-pressure cylinder body is a double-layer solid die-cast steel part, which ensures sufficient rigidity and strength.

[0016] As a preferred solution of the present invention, the upper head and the lower head of the high-pressure cylinder are both provided with a protrusion, and the protrusion extends into the high-pressure cylinder body. The protrusion extends into the high-pressure cylinder body, which can ensure that the upper head and the lower head of the high-pressure cylinder are more reliably sealed with the high-pressure cylinder body.

[0017] A method for isostatic pressing of a grain column based on an oil press comprises the following steps:

[0018] S1: Load the filled product mold into the product hanging basket, and load several product hanging baskets into the high-pressure cylinder;

[0019] S2: The upper head and the lower head of the high-pressure cylinder are pressed together with the high-pressure cylinder body through the upper oil pressure mechanism and the lower oil pressure mechanism, and a certain pre-pressure is applied;

[0020] S3: The oil supply tank and the oil temperature heating tank circulate oil and heat the high-pressure cylinder;

[0021] S4: After the heating reaches the set state, the supercharger starts to pressurize the high-pressure cylinder through the liquid confluence valve;

[0022] S5: Maintain the set oil pressure for a certain period of time to achieve isostatic pressing of the grain column;

[0023] S6: The proportional pressure relief valve releases the high-pressure oil in the high-pressure cylinder slowly and safely.

[0024] The beneficial effects of the present invention are:

[0025] The present invention combines the traditional hydraulic press system with the isostatic pressing process and is applied to the production of military explosive column pressing. The isostatic pressing process of explosive column pressing can achieve multiple production at one time, and the product pressing force is omnidirectional, so that the force is balanced, the quality is stable, and the mold is light. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional view of the present invention;

[0027] Figure 2 yes Figure 1 Partial structure diagram in ;

[0028] Figure 3 yes Figure 2 Partial cross-sectional view at A in the middle;

[0029] Figure 4 It is a front view of the present invention;

[0030] Figure 5 It is a right side view of the present invention;

[0031] Figure 6 It is a top view of the present invention.

[0032] In the figure: 1-fixed workbench in the middle of the press; 2-high-pressure cylinder body; 3-upper oil pressure mechanism; 4-lower oil pressure mechanism; 5-oil supply tank; 6-booster; 7-liquid confluence valve; 8-product hanging basket; 9-proportional pressure relief valve; 21-upper head of high-pressure cylinder; 22-lower head of high-pressure cylinder; 31-pressor top seat; 32-upper pressure column; 33-pressor upper slide; 41-pressor base; 42-lower pressure column; 43-pressor lower slide; 51-oil inlet pipeline; 52-oil return pipeline; 53-oil temperature heating box; 81-hook; 211-hanging platform. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] 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 merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0035] like Figure 1 to Figure 6As shown, the isostatic pressing system of the medicine column based on the hydraulic press of this embodiment includes a fixed workbench 1 in the middle of the press, a high-pressure cylinder body 2 is installed in the fixed workbench 1 in the middle of the press, a high-pressure cylinder upper head 21 is arranged on the upper side of the high-pressure cylinder body 2, the upper head 21 of the high-pressure cylinder is connected to the upper oil pressure mechanism 3, a high-pressure cylinder lower head 22 is arranged on the lower side of the high-pressure cylinder body 2, the lower head 22 of the high-pressure cylinder is connected to the lower oil pressure mechanism 4; and also includes an oil supply tank 5, which is connected to the supercharger through an oil inlet pipeline 51. 6. The supercharger 6 is connected to a liquid confluence valve 7 through a pipeline. The liquid confluence valve 7 is connected to the lower head 22 of the high-pressure cylinder through a pipeline. The liquid confluence valve 7 is communicated with the interior of the high-pressure cylinder body 2 through the lower head 22 of the high-pressure cylinder. The upper head 21 of the high-pressure cylinder is connected to the oil supply tank 5 through an oil return line 52. The oil return line 52 is communicated with the interior of the high-pressure cylinder body 2 through the upper head 21 of the high-pressure cylinder; a plurality of product hanging baskets 8 are arranged in the high-pressure cylinder body 2, and a plurality of filled product molds are installed in the product hanging baskets 8.

[0036] Load the filled product mold into the product hanging basket 8, and load several product hanging baskets 8 into the high-pressure cylinder 2. Through the upper oil pressure mechanism 3 and the lower oil pressure mechanism 4, the upper head 21 of the high-pressure cylinder and the lower head 22 of the high-pressure cylinder are pressed together with the high-pressure cylinder 2 respectively, and a certain pre-pressure is applied. The oil supply tank 5 and the oil temperature heating box 53 circulate oil and heat the high-pressure cylinder 2. When the heating reaches the set state, the supercharger 6 starts to pressurize the high-pressure cylinder 2 through the liquid confluence valve 7. Maintain the set oil pressure for a certain period of time to achieve isostatic pressing of the medicine column.

[0037] The filled product mold includes a mold sleeve, in which a vacuumized explosive column is filled, and the two ends of the mold sleeve are sealed with an upper punch and a lower punch respectively. The product mold is placed in a product hanging basket 8 as a whole, and then the product hanging basket 8 is placed in the high-pressure cylinder 2. After the hydraulic oil in the high-pressure cylinder 2 is pressurized, the high-pressure oil squeezes the explosive column from the upper punch and the lower punch. Since the product mold is arranged in the high-pressure cylinder 2 as a whole, the oil pressure on the upper punch and the lower punch is always consistent, thereby realizing isostatic pressing of the explosive column.

[0038] The present invention combines the traditional hydraulic press system with the isostatic pressing process and is applied to the production of military explosive column pressing. The isostatic pressing process of explosive column pressing can achieve multiple production at one time, and the product pressing force is omnidirectional, so that the force is balanced, the quality is stable, and the mold is light.

[0039] Furthermore, the liquid confluence valve 7 is connected to a proportional pressure relief valve 9 through a pipeline, and the proportional pressure relief valve 9 is connected to the oil return pipeline 52 through a pressure relief pipeline. After the isostatic pressing of the charge column, the pressure of the hydraulic oil in the high-pressure cylinder 2 is relatively high, and the oil cannot be directly unloaded through the oil return pipeline 52. When unloading the oil, the high-pressure oil in the high-pressure cylinder 2 is first slowly and safely released through the proportional pressure relief valve 9, and the remaining oil is recovered into the oil supply tank 5 through the oil return pipeline 52 after the pressure is balanced.

[0040] In order to ensure the oil temperature is controlled, an oil temperature heating box 53 is connected to the oil inlet pipeline 51. After the upper oil pressure mechanism 3 and the lower oil pressure mechanism 4 respectively press the high-pressure cylinder upper head 21 and the high-pressure cylinder lower head 22, the high-pressure cylinder body 2 is first circulated and heated through the oil supply box 5 and the oil temperature heating box 53, so that the oil temperature reaches the set state, ensuring that the high-pressure oil acts better on the high-pressure cylinder upper head 21 and the high-pressure cylinder lower head 22.

[0041] Specifically, the upper oil pressure mechanism 3 includes a press top seat 31, the press top seat 31 is provided with an upper oil pressure cylinder, the upper oil pressure cylinder is provided with an upper pressure column 32, the other end of the upper pressure column 32 is connected to the press upper slide 33, and the press upper slide 33 presses the high-pressure cylinder upper head 21. After the upper oil pressure cylinder is filled with hydraulic oil, the upper pressure column 32 is pushed out, and the upper pressure column 32 pushes the press upper slide 33 to move, and the press upper slide 33 presses the high-pressure cylinder upper head 21 and the high-pressure cylinder body 2.

[0042] Specifically, the lower hydraulic mechanism 4 includes a press base 41, the press base 41 is provided with a lower hydraulic cylinder, the lower hydraulic cylinder is provided with a lower pressure column 42, the other end of the lower pressure column 42 is connected to a press lower slide 43, and the press lower slide 43 presses the high-pressure cylinder lower head 22. After the hydraulic oil is filled in the lower hydraulic cylinder, the lower pressure column 42 is pushed out, and the lower pressure column 42 pushes the press lower slide 43 to move, and the press lower slide 43 presses the high-pressure cylinder lower head 22 and the high-pressure cylinder body 2.

[0043] Furthermore, a hanging platform 211 is provided on the upper end cap 21 of the high-pressure cylinder, and a hook 81 is provided on the uppermost product hanging basket 8, and the hook 81 is hung on the hanging platform 211. The hook 81 on the uppermost product hanging basket 8 is hung on the hanging platform 211 of the upper end cap 21 of the high-pressure cylinder, ensuring that a plurality of product hanging baskets 8 are stably installed in the high-pressure cylinder body 2.

[0044] There is a gap between the bottom of the bottom product basket 8 and the lower head 22 of the high-pressure cylinder to ensure that the high-pressure oil can flow freely in the high-pressure cylinder 2, to ensure that the oil pressure in each part of the high-pressure cylinder 2 is the same, and to facilitate oil return. A sensor is provided in the high-pressure cylinder 2, and when there is a gap between the bottom of the bottom product basket 8 and the lower head 22 of the high-pressure cylinder, interference can be avoided.

[0045] The isostatically pressed high-pressure cylinder body 2 is adapted to the product characteristic scenario. The high-pressure cylinder body 2 is a double-layer solid die-cast steel part, which ensures sufficient rigidity and strength.

[0046] In this embodiment, the high-pressure cylinder upper head 21 and the high-pressure cylinder lower head 22 are both provided with a protrusion, and the protrusion extends into the high-pressure cylinder body 2. The protrusion extends into the high-pressure cylinder body 2, which can ensure that the high-pressure cylinder upper head 21 and the high-pressure cylinder lower head 22 are respectively sealed with the high-pressure cylinder body 2 more reliably.

[0047] The isostatic pressing method of the drug column based on the hydraulic press of this embodiment comprises the following steps:

[0048] S1: Load the filled product mold into the product hanging basket 8, and load several product hanging baskets 8 into the high-pressure cylinder 2;

[0049] S2: The upper head 21 and the lower head 22 of the high-pressure cylinder are pressed together with the high-pressure cylinder body 2 through the upper oil pressure mechanism 3 and the lower oil pressure mechanism 4, and a certain pre-pressure is applied;

[0050] S3: The oil supply tank 5 and the oil temperature heating tank 53 circulate oil supply and circulate heat to the high-pressure cylinder 2;

[0051] S4: When the heating reaches the set state, the supercharger 6 starts to pressurize the high-pressure cylinder 2 through the liquid confluence valve 7;

[0052] S5: Maintain the set oil pressure for a certain period of time to achieve isostatic pressing of the grain column;

[0053] S6: The proportional pressure relief valve 9 slowly and safely releases the high-pressure oil in the high-pressure cylinder 2, and after the pressure is balanced, the oil return line 52 is opened to discharge the remaining oil.

[0054] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A isostatic pressing system for a grain column based on a hydraulic press, characterized in that: The press comprises a fixed workbench (1) in the middle of the press, a high-pressure cylinder body (2) is installed in the fixed workbench (1) in the middle of the press, a high-pressure cylinder upper head (21) is arranged on the upper side of the high-pressure cylinder body (2), the high-pressure cylinder upper head (21) is connected to an upper oil pressure mechanism (3), a high-pressure cylinder lower head (22) is arranged on the lower side of the high-pressure cylinder body (2), the high-pressure cylinder lower head (22) is connected to a lower oil pressure mechanism (4); and also comprises an oil supply box (5), the oil supply box (5) is connected to a supercharger (6) through an oil inlet pipeline (51), and the supercharger (6) is connected to a lower oil pressure mechanism (4) through a pipeline. A liquid converging valve (7) is connected to the lower end cap (22) of the high-pressure cylinder through a pipeline, the liquid converging valve (7) is communicated with the interior of the high-pressure cylinder body (2) through the lower end cap (22) of the high-pressure cylinder, the upper end cap (21) of the high-pressure cylinder is connected to the oil supply tank (5) through an oil return pipeline (52), and the oil return pipeline (52) is communicated with the interior of the high-pressure cylinder body (2) through the upper end cap (21) of the high-pressure cylinder; a plurality of product hanging baskets (8) are arranged in the high-pressure cylinder body (2), and a plurality of filled product molds are installed in the product hanging baskets (8).

2. The isostatic pressing system for a grain column based on a hydraulic press according to claim 1, characterized in that: The liquid converging valve (7) is connected to a proportional pressure relief valve (9) via a pipeline, and the proportional pressure relief valve (9) is connected to an oil return pipeline (52) via a pressure relief pipeline.

3. The isostatic pressing system for a grain column based on an oil hydraulic press according to claim 2, characterized in that: The oil inlet pipeline (51) is connected to an oil temperature heating box (53).

4. The isostatic pressing system for grains based on a hydraulic press according to claim 1, characterized in that: The upper oil pressure mechanism (3) comprises a press top seat (31), the press top seat (31) is provided with an upper oil pressure cylinder, an upper pressure column (32) is sleeved in the upper oil pressure cylinder, the other end of the upper pressure column (32) is connected to a press upper slide (33), and the press upper slide (33) presses the high-pressure cylinder upper head (21).

5. The isostatic pressing system for grains based on a hydraulic press according to claim 1, characterized in that: The lower oil pressure mechanism (4) comprises a press base (41), the press base (41) is provided with a lower oil pressure cylinder, a lower pressure column (42) is sleeved in the lower oil pressure cylinder, the other end of the lower pressure column (42) is connected to a press lower slide (43), and the press lower slide (43) presses the lower head (22) of the high-pressure cylinder.

6. The isostatic pressing system for grains based on a hydraulic press according to claim 1, characterized in that: A hanging platform (211) is arranged on the upper sealing head (21) of the high-pressure cylinder, and a hook (81) is arranged on the uppermost product hanging basket (8), and the hook (81) is hung on the hanging platform (211).

7. The isostatic pressing system for grains based on a hydraulic press according to claim 6, characterized in that: A gap is left between the bottom of the product hanging basket (8) at the bottom and the lower cover (22) of the high-pressure cylinder.

8. The isostatic pressing system for grains based on a hydraulic press according to claim 1, characterized in that: The high-pressure cylinder body (2) is a double-layer solid die-cast steel part.

9. The isostatic pressing system for grains based on a hydraulic press according to claim 1, characterized in that: The high-pressure cylinder upper head (21) and the high-pressure cylinder lower head (22) are both provided with a protrusion, and the protrusion extends into the high-pressure cylinder body (2).

10. A method for isostatic pressing of a grain based on a hydraulic press, using the isostatic pressing system for a grain based on a hydraulic press as claimed in claim 3, characterized in that: The following steps are involved: S1: Place the filled product mold into a product hanging basket (8), and place a plurality of product hanging baskets (8) into a high-pressure cylinder (2); S2: The upper oil pressure mechanism (3) and the lower oil pressure mechanism (4) are used to press the upper head (21) and the lower head (22) of the high-pressure cylinder together with the high-pressure cylinder body (2), and a certain pre-pressure is applied; S3: The oil supply tank (5) and the oil temperature heating tank (53) circulate oil supply and circulate heat to the high-pressure cylinder (2); S4: When the heating reaches the set state, the booster (6) starts to pressurize the high-pressure cylinder (2) through the liquid converging valve (7); S5: Maintain the set oil pressure for a certain period of time to achieve isostatic pressing of the grain column; S6: The proportional pressure relief valve (9) slowly and safely releases the high-pressure oil in the high-pressure cylinder (2).

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