Secondary pressurizing device for forming graphite crucible

Abstract

The utility model belongs to the field of graphite crucible processing equipment, and particularly relates to a graphite crucible forming secondary pressurizing device, which comprises a die sleeve, a pressure sensor and a pressure sensor, the die head is matched with the die sleeve and is used for extruding the materials in the die sleeve; the pressurizing sliding sleeve is arranged on the outer side of the die head; the pressing ring is arranged on the pressurizing sliding sleeve and used for driving the pressurizing sliding sleeve to move; according to the utility model, secondary pressurization can be carried out, and the purpose of secondary pressurization is to eliminate the pressure difference between the bottom and the top of the crucible, so that the elastic aftereffect difference caused by non-uniform pressure gradient is reduced to achieve the purpose of reducing cracks, and the produced crucible is uniform and consistent in volume density and reduced in cracks. And the sealing ring is additionally arranged on the pressing ring, so that the paste is effectively prevented from being mixed in, and the operation is more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of graphite crucible processing equipment, in particular to a secondary pressurizing device for graphite crucible forming. Background Technique

[0002] At present, 1200 - 2000 ton presses are generally used as the main forming equipment for the forming of green graphite crucibles. The kneaded paste is put into a mold for pressing, then kept under pressure for about 150 seconds, and after demolding, it is naturally cooled to room temperature to obtain a green crucible blank. The height of the green crucible blank is generally 1250 mm, the diameter is 500 - 600 mm, and it has a hollow structure with a bottom thickness of 130 mm and a wall thickness of 60 mm. Therefore, in the actual production process, due to the large aspect ratio of the green crucible, the paste in the mold is affected by uneven pressure, resulting in a gradient in the elastic properties stored in the crucible, causing excessive elastic aftereffect or differences in elastic aftereffect. Especially at the top edge of the crucible, a large number of fine cracks and looseness occur. After the green crucible is baked, the width and length of the cracks will also increase significantly, resulting in a large number of defective products.

[0003] The common problems existing in the current market for green graphite crucibles are:

[0004] There are many cracks in the green crucible, especially fine cracks and surface looseness at the top edge. The internal volume density of the crucible is uneven (the average volume density at the bottom of the current market green graphite crucible is 1.70 g / cm³, and the average volume density at the top is 1.60 g / cm³).

[0005] The qualified rate of green crucibles after baking is generally not high, usually about 85%, and there is still much room for improvement. The main reason is that the cracks and uneven volume density inside the green graphite crucible cause cracking when the temperature rises during baking. Content of the Utility Model

[0006] The purpose of the utility model is to propose a secondary pressurizing device for graphite crucible forming to solve the disadvantages existing in the prior art.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] The secondary pressurizing device for graphite crucible forming includes:

[0009] A die sleeve for placing graphite crucible materials;

[0010] A die head, which cooperates with the die sleeve and is used to extrude the materials in the die sleeve;

[0011] A pressurizing sliding sleeve arranged outside the die head;

[0012] The pressure ring is arranged on the pressurizing sliding sleeve and is used to drive the pressurizing sliding sleeve to move;

[0013] The oil cylinder is connected to the pressure ring and is used to drive the pressure ring to move.

[0014] Preferably, a sealing ring is arranged inside the pressurizing sliding sleeve, and the inner side of the sealing ring contacts the outer side of the die head.

[0015] Preferably, the die sleeve is connected with a base, and a top cylinder is arranged on the base.

[0016] Preferably, a guide post is fixedly installed on the base, and an upper die base is slidably installed on the guide post.

[0017] Preferably, there are two oil cylinders, and the oil cylinders are fixedly connected to the upper die base.

[0018] Preferably, an installation seat is fixedly installed at the top of the guide post, a hydraulic cylinder is installed on the installation seat, and the output shaft of the hydraulic cylinder is connected to the upper die base.

[0019] In the present utility model, the beneficial effects of the graphite crucible forming secondary pressurizing device are as follows:

[0020] The oil cylinder on the pressure ring acts to drive the pressure ring to move downward and stop working (i.e., secondary pressurization) after reaching the set pressure. The purpose of secondary pressurization is to eliminate the pressure difference between the bottom and the top of the crucible, thereby reducing the elastic aftereffect difference caused by uneven pressure gradient to achieve the purpose of reducing cracks. After 150 seconds, the die head and the pressure ring rise simultaneously. After reaching the position, the crucible is pushed out by the top cylinder under the die sleeve. The produced crucible has uniform volume density, reduced cracks, and significantly improved appearance. In order to prevent the paste from infiltrating into the gap between the pressure ring and the die head during the crucible pressing process in actual production, a sealing ring is installed on the pressure ring, effectively preventing the infiltration of the paste and making the operation more reliable. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the graphite crucible forming secondary pressurizing device proposed by the present utility model;

[0022] Figure 2 It is a schematic structural diagram of the pressurizing sliding sleeve of the graphite crucible forming secondary pressurizing device proposed by the present utility model;

[0023] Figure 3 It is a schematic top view structural diagram of the pressurizing sliding sleeve of the graphite crucible forming secondary pressurizing device proposed by the present utility model;

[0024] Figure 4 It is of the graphite crucible forming secondary pressurizing device proposed by the present utility model Figure 1 The enlarged structural schematic diagram of part A in it.

[0025] In the figure: 1. Base; 2. Die sleeve; 3. Guide post; 4. Upper die holder; 5. Die head; 6. Pressing sliding sleeve; 7. Sealing ring; 8. Oil cylinder; 9. Pressing ring; 10. Jack cylinder. Detailed implementation manner

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] Refer to Figures 1 - 4 , the secondary pressing device for graphite crucible forming, comprising:

[0028] Die sleeve 2, for placing graphite crucible materials;

[0029] Die head 5, cooperating with die sleeve 2, for extruding the materials in die sleeve 2;

[0030] Pressing sliding sleeve 6, arranged on the outside of die head 5;

[0031] Pressing ring 9, arranged on pressing sliding sleeve 6, for driving pressing sliding sleeve 6 to move;

[0032] Oil cylinder 8, connected to pressing ring 9, for driving pressing ring 9 to move.

[0033] In the present invention, a sealing ring 7 is arranged inside pressing sliding sleeve 6, and the inner side of sealing ring 7 contacts the outside of die head 5.

[0034] In the present invention, die sleeve 2 is connected to base 1, and a jack cylinder 10 is arranged on base 1.

[0035] In the present invention, guide posts 3 are fixedly installed on base 1, and an upper die holder 4 is slidably installed on guide posts 3.

[0036] In the present invention, there are two oil cylinders 8, and oil cylinders 8 are fixedly connected to upper die holder 4.

[0037] In the present invention, an installation seat is fixedly installed at the top of guide post 3, a hydraulic cylinder is installed on the installation seat, and the output shaft of the hydraulic cylinder is connected to upper die holder 4.

[0038] In the present utility model, in the normal production process, the kneaded paste is first weighed and then placed into the die sleeve 2. Then, the die head 5 descends. Under the pressure of the die head 5, a part of the paste in the die sleeve 2 will move upward. After the die head 5 continues to descend to the specified position, the die head 5 stops. At this time, the bottom of the crucible bears a relatively large pressure and the top bears a relatively small pressure. Then, the oil cylinder 8 on the pressure ring 9 acts to drive the pressure ring 9 to move downward and stop working after reaching the set pressure (i.e., secondary pressurization). The purpose of the secondary pressurization is to eliminate the pressure difference between the bottom and the top of the crucible, thereby reducing the elastic aftereffect difference caused by the uneven pressure gradient to achieve the purpose of reducing cracks. After 150 seconds, the die head and the pressure ring rise simultaneously. After reaching the position, the top cylinder under the die sleeve pushes out the crucible. The produced crucible has a uniform volume density, reduced cracks, and significantly improved appearance. In order to prevent the paste from infiltrating into the gap between the pressure ring and the die head during the crucible pressing process in actual production, a sealing ring 7 is installed on the pressure ring 9, effectively preventing the infiltration of the paste and making the operation more reliable.

[0039] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A secondary pressurizing device for graphite crucible forming, characterized in that, Comprising: A die sleeve (2) for placing graphite crucible materials; A die head (5) cooperating with the die sleeve (2) for extruding the materials in the die sleeve (2); A pressure slide sleeve (6) disposed outside the die head (5); A pressure ring (9) disposed on the pressure slide sleeve (6) for driving the pressure slide sleeve (6) to move; An oil cylinder (8) connected to the pressure ring (9) for driving the pressure ring (9) to move.

2. The secondary pressure device for forming a graphite crucible according to claim 1, wherein A sealing ring (7) is provided inside the pressure slide sleeve (6), and the inner side of the sealing ring (7) contacts the outer side of the die head (5).

3. The secondary pressure device for forming a graphite crucible according to claim 2, characterized in that, The die sleeve (2) is connected to a base (1), and a jack (10) is provided on the base (1).

4. The graphite crucible forming secondary pressurizing device according to claim 3, wherein, A guide post (3) is fixedly installed on the base (1), and an upper die holder (4) is slidably installed on the guide post (3).

5. The secondary pressurizing device for graphite crucible forming according to claim 4, wherein, There are two oil cylinders (8), and the oil cylinders (8) are fixedly connected to the upper die holder (4).

6. The graphite crucible forming secondary pressurizing device according to claim 5, characterized in that, An installation seat is fixedly installed at the top of the guide post (3), and a hydraulic cylinder is installed on the installation seat. The output shaft of the hydraulic cylinder is connected to the upper die holder (4).

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