A dynamic sealing device and a vacuum continuous casting apparatus

Abstract

The utility model provides a kind of dynamic sealing device and vacuum continuous casting equipment, including the sealing cylinder body that motion rod body passes through, the guide sleeve for being used to be set on motion rod body and being slidably matched with motion rod body is equipped in sealing cylinder body;Sealing cylinder body is equipped with the seal end cap of openable and closable for motion rod body to pass out one end, guide sleeve both ends and sealing cylinder body and seal end cap between respectively are equipped with sealing assembly, sealing assembly is set on motion rod body and is slidably sealed with motion rod body cooperation.The utility model passes through the sealing cylinder body that motion rod body passes through, plays the primary sealing effect;Guide sleeve is arranged in sealing cylinder body, plays the guiding effect;Sealing assembly is arranged between guide sleeve and sealing cylinder body, strengthens the sealing effect, makes the process of motion rod body to pass through sealing cylinder body and move outward whole-course sealing;Through the seal end cap of openable and closable, when motion rod body does not pass through seal end cap, close to sealing cylinder body sealing;Only when motion rod body enters seal end cap, open for motion rod body to pass out, improve sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a sealing device and a vacuum continuous casting equipment. Background Technology

[0002] With rapid technological advancements and the emergence of numerous advanced technologies, vacuum continuous casting technology can be used to produce cast metal rods. Currently, there are many vacuum continuous casting methods, such as horizontal continuous casting, upward continuous casting, and downward continuous casting. Each method has its advantages and disadvantages, and is applicable to different process scenarios. For a newly developed vacuum continuous casting device, the molten casting enters the external environment from the vacuum chamber and is then drawn out from below by traction rollers.

[0003] Vacuum continuous casting has the following advantages over conventional continuous casting: 1. Improving metal purity can effectively remove gases such as hydrogen, nitrogen, and oxygen from molten metal, reducing the risk of porosity and gas-related defects in the final casting product.

[0004] 2. Reduced element burn-off: The rapid conversion technology of vacuum + atmosphere protection enables continuous feeding, continuous melting, and continuous casting under high vacuum / atmosphere conditions, significantly reducing the burn-off of precious metal elements and ensuring the consistency of composition during the continuous production of billets, which is difficult to achieve with conventional continuous casting.

[0005] 3. Improved surface quality: In conventional continuous casting, molten metal is easily oxidized when in contact with air, affecting surface quality. Vacuum continuous casting, however, reduces the contact between molten metal and oxygen, lowering the risk of oxidation, reducing surface defects caused by oxide formation, achieving better surface finish, and reducing subsequent processing steps.

[0006] 4. Enhanced mechanical properties: Due to the reduction of impurities and gas content, and the more dense and uniform structure, the toughness and fatigue resistance of the metal are improved, and the creep resistance under corrosive environments and high temperature conditions is also stronger. Compared with conventional continuous casting, its products have better mechanical properties.

[0007] However, in existing vacuum continuous casting equipment, there is a risk of external ambient gas leaking into the vacuum chamber during the process of the casting moving from the vacuum chamber into the external environment. Summary of the Invention

[0008] To address the aforementioned technical problems, this utility model proposes a dynamic sealing device and a vacuum continuous casting equipment to solve the problem in the prior art where external ambient gas easily enters the vacuum chamber during the process of the casting entering the external environment from the vacuum chamber.

[0009] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A dynamic sealing device includes a sealing cylinder through which a moving rod passes. A guide sleeve is provided inside the sealing cylinder for slidingly fitting onto and engaging with the moving rod. An openable and closable sealing end cap is provided at one end of the sealing cylinder through which the moving rod exits. Sealing components are respectively provided between the two ends of the guide sleeve and the sealing cylinder and the sealing end cap. The sealing components are fitted onto the moving rod and slidably seal against it. This invention provides a preliminary sealing effect by setting up a sealing cylinder through which the moving rod passes. The guide sleeve inside the sealing cylinder provides guidance. The sealing components between the guide sleeve and the sealing cylinder enhance the sealing effect, ensuring a complete seal as the moving rod moves outward through the sealing cylinder. The openable and closable sealing end cap closes to seal the sealing cylinder before the moving rod passes through, and only opens to allow the moving rod to exit after it enters the sealing end cap, thus improving sealing performance.

[0010] Furthermore, in order to facilitate the sealing connection and opening and closing of the sealing end cap, the sealing end cap includes a sealing cover body detachably connected to the end of the sealing cylinder body and a pressure cover baffle plate disposed at the end of the sealing cover body away from the sealing cylinder body, the pressure cover baffle plate and the sealing cover body are slidably sealed together; a sealing ring is provided between the pressure cover baffle plate and the sealing cover body.

[0011] Furthermore, in order to detect whether the moving rod is about to pass through the sealed end cap, a distance sensor is installed on the pressure plate baffle, and a sealing ring is provided between the distance sensor and the pressure plate baffle.

[0012] Furthermore, to facilitate the movement of the cap baffle, a cylinder is connected to the cap baffle to drive its movement.

[0013] Furthermore, in order to improve the sealing effect of the sealing cylinder, the sealing assembly includes sliding sealing rings disposed at both ends of the guide sleeve, with the inner side of the sliding sealing rings sealingly fitted to the outer wall of the moving rod; and the outer periphery of the sliding sealing rings fitting to the inner wall of the sealing cylinder.

[0014] Furthermore, a flat washer is provided between the sliding seal ring and the guide sleeve, and the flat washer is fitted on the moving rod body; the two ends of the sliding seal ring are respectively attached to the flat washer and the sealing cylinder body or the pressure cover baffle.

[0015] Furthermore, in order to prevent compression and provide a high-pressure seal, an anti-compression element is provided between the outer end of the guide sleeve and the flat washer, and the anti-compression element is in close contact with the inner wall of the sealing cylinder.

[0016] A vacuum continuous casting equipment includes a feeding vacuum chamber, a melting and casting vacuum chamber, a cooling vacuum chamber, and an atmospheric pressure chamber connected in sequence, wherein the atmospheric pressure chamber is provided with a dynamic sealing device as described above.

[0017] Furthermore, in order to create a sealed environment at the location where the cast rod exits the equipment, the sealing cylinder is screwed to the end of the cooling vacuum chamber away from the melting and casting vacuum chamber; a sealing ring is provided between the end of the sealing cylinder and the cooling vacuum chamber.

[0018] Furthermore, in order to drive the movement of the moving rod, a traction device is provided in the atmospheric pressure chamber. The traction device works in conjunction with the moving rod to drive its movement.

[0019] Beneficial effects of this utility model 1. This utility model provides a dynamic sealing device in the vacuum continuous casting equipment to seal the entire process of the cast rod billet moving from the vacuum chamber of the equipment to the outside, so as to prevent external ambient gas from leaking into the vacuum chamber and avoiding contamination of the cast rod billet, i.e., the moving rod body. 2. This utility model provides a sealing cylinder through which the cast rod blank passes in a dynamic sealing device to provide a preliminary seal for the guide sleeve. Then, a guide sleeve fitted on the cast rod blank is provided in the sealing cylinder to provide a guiding function. 3. This utility model enhances the sealing effect by setting a Y-shaped sealing ring fitted on the cast rod blank between the upper and lower ends of the guide sleeve and the sealing cylinder body; 4. This utility model provides an openable and closable sealing end cap on one end of the sealed cylinder through which the cast rod blank passes. When the cast rod blank has not passed through the sealing end cap, the pressure baffle of the sealing end cap seals the sealed cylinder. Only after the cast rod blank enters the cover of the sealing end cap will the pressure baffle open to allow the moving rod to pass through, further preventing external ambient gas from leaking into the vacuum chamber. 5. This utility model effectively achieves a reliable seal between the external environment and the vacuum chamber, thereby blocking the infiltration of external gas into the vacuum chamber and filling the gap in sealing technology under high temperature dynamic conditions in this field. Furthermore, the device has the advantages of simple and flexible operation and compact structure. While ensuring high-performance sealing effect, it significantly reduces the equipment manufacturing cost and has extremely strong practical application value. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the vacuum continuous casting equipment of this utility model; Figure 2 This is a schematic diagram of the dynamic sealing device of this utility model.

[0022] In the diagram: 1. Feeding vacuum chamber, 2. Casting vacuum chamber, 3. Melt, 4. Thermal insulation pad, 5. Crystallizer, 6. Copper cold jacket, 7. Cast rod billet, 8. Cooling vacuum chamber, 81. Vacuum chamber outer wall, 9. Cooling water tank, 10. High-temperature dynamic sealing device, 101. First O-ring seal, 102. First Y-ring seal, 103. First flat washer, 104. First triangular washer, 105. Guide sleeve, 106. Second triangular washer, 107. Second flat washer, 108. Second Y-ring seal, 109. Second O-ring seal, 110. Pressure plate baffle, 111. Third Y-ring seal, 112. Distance sensor, 113. Cylinder, 114. Sealing cover, 115. Connecting bolt, 116. Sealing cylinder body, 11. Traction device. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figure 2 As shown in Embodiment 1 of this utility model, a dynamic sealing device includes a sealing cylinder 116 through which a moving rod passes, and a guide sleeve 105 provided inside the sealing cylinder 116 for being sleeved on and slidably engaged with the moving rod. In this embodiment, as... Figure 1 As shown, this dynamic sealing device is used in a vacuum vertical casting equipment; the moving rod is a rod-shaped cast rod blank 7. A sealing cylinder 116 has an openable and closable sealing end cap at the lower end of the sealing cylinder 116, through which the moving rod, i.e., the cast rod blank 7, passes. Sealing components are respectively provided between the two ends of the guide sleeve 105 and the sealing cylinder 116 and the sealing end cap. The sealing components are sleeved on the moving rod and slide in a sealing fit with the cast rod blank 7, enhancing the seal during the downward movement of the cast rod blank 7. Specifically, when the cast rod blank 7 is not close to the sealing end cap, the sealing end cap is closed to maintain a sealed environment within the dynamic sealing device. Only when the cast rod blank needs to pass through the sealing end cap does the sealing end cap open to allow the cast rod blank 7 to pass through. During this process, the sliding sealing fit between the cast rod blank 7 and the sealing components increases the sealing performance during the sliding process. Therefore, the sealing performance within the sealing cylinder 116 is improved.

[0025] Furthermore, such as Figure 2As shown, the sealing end cap includes a sealing cover 114 detachably connected to the lower end of the sealing cylinder 116 and a pressure cover baffle 110 disposed at the end of the sealing cover 114 away from the sealing cylinder 116, i.e., the lower end of the sealing cover 114. The pressure cover baffle 110 is slidably and sealingly connected to the sealing cover 114. Specifically, the sealing cylinder 116 has an annular structure, and the sealing cylinder 116 is fixedly connected to the lower end of the sealing cylinder 116 by connecting bolts 115. The pressure cover baffle 110 is tightly fitted to the lower side of the sealing cover 114, and a sealing ring is provided between the pressure cover baffle 110 and the sealing cover 114. In this embodiment, the sealing ring is a second O-ring 109; the upper side of the pressure cover baffle 110 is provided with an annular groove for placing the second O-ring 109, and the second O-ring 109 protrudes from the groove.

[0026] Furthermore, such as Figure 2 As shown, a cylinder 13 is connected to the pressure plate baffle 110 to drive the movement of the pressure plate baffle 110. The cylinder 13 is fixed in the vacuum vertical casting equipment. The telescopic end of the cylinder 13 is connected to the pressure plate baffle 110, which can both drive the movement of the pressure plate baffle 110 and stably fit the pressure plate baffle 110 against the lower side of the sealing cover 114, so that a sealed environment is formed between the sealing cylinder and the outer wall of the vacuum chamber.

[0027] Example 2 differs from Example 1 in that, as Figure 2 As shown, a distance sensor 12 is mounted on the cap baffle 110 to detect whether the cast rod blank 7 is close to the cap baffle 110. The distance sensor 12 is positioned directly opposite the cast rod blank 7 in the middle of the cap baffle 110. Due to the limited space inside the sealing end cap, the distance sensor 12 is mounted on the cap baffle 110. A third Y-shaped sealing ring 111 is provided between the distance sensor 12 and the cap baffle 110. The distance sensor 12 is connected to a cylinder 13 via a controller. After the distance sensor 12 detects that the lower end of the cast rod blank 7 has entered the sealing cover body 114, the cylinder 113 operates, causing the cap baffle 110 to move laterally to a position that does not obstruct the downward movement of the cast rod blank 7.

[0028] Example 3 differs from Example 2 in that, as Figure 2 As shown, the sealing assembly includes sliding sealing rings disposed at the upper and lower ends of the guide sleeve 105. In this embodiment, the sliding sealing rings are Y-shaped sealing rings. A first Y-shaped sealing ring 102 is disposed at the upper end of the guide sleeve 105; a second Y-shaped sealing ring 108 is disposed at the lower end of the guide sleeve 105. The inner sides of the first Y-shaped sealing ring 102 and the second Y-shaped sealing ring 108 are sealed and fitted against the outer wall of the cast rod blank 7. The outer peripheries of the first Y-shaped sealing ring 102 and the second Y-shaped sealing ring 108 are fitted against the inner wall of the sealing cylinder 116. The upper side of the first Y-shaped sealing ring 102 is fitted against the top of the sealing cylinder 116. The lower side of the second Y-shaped sealing ring 108 is fitted against the upper surface of the pressure plate baffle 110.

[0029] Example 4 differs from Example 3 in that, as Figure 2 As shown, a flat washer is provided between the sliding sealing ring and the guide sleeve 105, and the flat washer is fitted onto the moving rod. In this embodiment, a first flat washer 103 is provided between the first Y-shaped sealing ring 102 and the upper end of the guide sleeve 105, and the upper and lower sides of the first flat washer 103 are tightly fitted with the first Y-shaped sealing ring 102 and the guide sleeve 105; a second flat washer 107 is provided between the second Y-shaped sealing ring 108 and the lower end of the guide sleeve 105, and the upper and lower sides of the second flat washer 107 are tightly fitted with the second Y-shaped sealing ring 108 and the guide sleeve 105.

[0030] Example 5 differs from Example 4 in that, as Figure 2 As shown, an anti-compression element is also provided between the end of the guide sleeve 105 and the flat washer, and the anti-compression element is in close contact with the inner wall of the sealing cylinder 116. In this embodiment, the anti-compression element is a triangular washer; a first triangular washer 104 is provided between the first flat washer 103 and the guide sleeve 105; a second triangular washer 106 is provided between the second flat washer 107 and the guide sleeve 105. Specifically, a shoulder is provided at each end of the guide sleeve 105. The outer periphery of the shoulder is a slope, that is, the outer periphery of the shoulder gradually narrows inward from the outer periphery of the guide sleeve 105 toward the end of the shoulder, so that the outer periphery of the shoulder forms an annular cavity with a cross-section of two symmetrical triangles between the flat washer and the inner wall of the sealing cylinder 116. The two triangular washers are respectively installed in the annular cavities at both ends of the guide sleeve 105, and the cross-sectional area of ​​the annular cavity is smaller than the cross-sectional area of ​​the triangular washer.

[0031] Furthermore, the cross-section of the triangular washer is a right triangle, with the inclined surface of the right triangle fitting the outer periphery of the shoulder; the two straight sides respectively fit the flat washer and the inner wall of the sealing cylinder 116.

[0032] Example 6 differs from Example 5 in that, to meet the material requirements of the dynamic sealing device for the sealing element, a material with high temperature and pressure resistance, as well as certain plasticity and elastic deformation capacity, must be selected. Furthermore, it must possess sufficient mechanical strength, high wear resistance, and self-lubricating properties. In this example, the Y-type sealing ring and flat washer can be made of polytetrafluoroethylene with added carbon or graphite. This material has high mechanical strength, a working temperature up to 340℃, a working pressure up to 300MPa, and self-lubricating properties, making it suitable for reciprocating dynamic seals. In this example, the triangular washer and guide sleeve are both made of beryllium bronze.

[0033] The working process of this dynamic sealing device is as follows: After the cast rod blank 7 moves vertically downwards through the vacuum chamber, it enters the sealed cylinder. The cast rod blank 7 gradually contacts the sealing ring in the sealed cylinder. At this point, the outer lip of the Y-shaped sealing ring contacts the inner wall of the sealed cylinder, and the inner lip of the Y-shaped sealing ring contacts the outer wall of the cast rod blank 7, thus forming a new sealed environment to prevent external ambient gas from entering the vacuum chamber. When the distance sensor detects that the lower end of the cast rod blank 7 has entered the sealing end cover, the cylinder drives the pressure plate baffle to a position that does not obstruct the cast rod blank 7. At this time, the cast rod blank 7 can continue to move downwards through the sealing end cover of the sealed cylinder. While conveying the cast rod blank downwards, the environment of the vacuum chamber is also maintained, achieving a dynamic seal between the vacuum chamber and the external environment.

[0034] Example 7 differs from Example 6 in that, as Figure 1 As shown, a vacuum continuous casting device is described. In this embodiment, the vacuum continuous casting device is a three-chamber vacuum cold vertical casting device. The device includes a feeding vacuum chamber 1, a melting and casting vacuum chamber 2, a cooling vacuum chamber 8, and an atmospheric pressure chamber connected sequentially from top to bottom. The atmospheric pressure chamber is equipped with the aforementioned dynamic sealing device. The melting and casting vacuum chamber 2 has a melting and casting container containing melt 3. A crystallizer 5 is located at the bottom of the melting and casting container, and a copper cold jacket 6 is located on the outside of the crystallizer. The crystallizer 5 has a vertical space for forming a cast rod 7, and the bottom of the melting and casting container has a through hole aligned with and communicating with this space. The cooling vacuum chamber 8 is equipped with a cooling water tank 9, and the cooling water tank has a space for the cast rod 7 to pass through vertically. The top and bottom of the cooling vacuum chamber 8 are both provided with through holes for the cast rod 7 to pass through vertically.

[0035] Furthermore, a traction device 11 is provided in the atmospheric pressure chamber, which is a traction device in the prior art. The traction device 11 is provided with at least one pair of traction rollers. The moving rod body, i.e., the cast rod blank 7, passes through the pressure cover baffle 110 and enters between at least one pair of traction rollers. The downward movement of the cast rod blank 7 is driven by the opposite rotation of the traction rollers.

[0036] Furthermore, such as Figure 1 As shown, the sealing cylinder 116 is screwed to the end of the cooling vacuum chamber 8 furthest from the casting vacuum chamber 2; that is, the upper end of the sealing cylinder 116 is threadedly connected to the bottom 81 of the cooling vacuum chamber 8, thus hanging below the cooling vacuum chamber 8. The inlet of the sealing cylinder 116 is aligned and communicates with the through hole at the bottom of the cooling vacuum chamber 8. A first O-ring 101 is provided between the end of the sealing cylinder 116 and the cooling vacuum chamber 8. A sealed environment is formed between the sealing cylinder and the bottom 81 of the vacuum chamber to prevent external ambient gas from entering the vacuum chamber during the output of the cast rod 7.

[0037] During operation: The cast rod sequentially passes through the crystallizer 5 at the bottom of the casting container, the cooling water tank 9 in the cooling vacuum chamber 8, enters the sealing cylinder 116 of the dynamic sealing device, and then enters the traction device 11, continuously moving downwards. During this process, the dynamic sealing device ensures the airtightness of the vacuum chamber, preventing external ambient gas from leaking into the vacuum chamber.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some or all of the technical features thereof, within the spirit and principles of the present invention, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A dynamic sealing device, characterized in that, The device includes a sealed cylinder (116) through which the moving rod passes. The sealed cylinder (116) is provided with a guide sleeve (105) for being fitted onto the moving rod and slidingly engaging with it. The end of the sealed cylinder (116) through which the moving rod passes is provided with an openable and closable sealing end cap. Sealing components are provided between the two ends of the guide sleeve (105) and the sealed cylinder (116) and the sealing end cap, respectively. The sealing components are fitted onto the moving rod and slidingly sealingly engaging with it.

2. The dynamic sealing device according to claim 1, characterized in that, The sealing end cap includes a sealing cover body (114) detachably connected to the end of the sealing cylinder body (116) and a pressure cover baffle (110) disposed at the end of the sealing cover body (114) away from the sealing cylinder body (116). The pressure cover baffle (110) and the sealing cover body (114) are slidably sealed together. A sealing ring is provided between the pressure cover baffle (110) and the sealing cover body (114).

3. The dynamic sealing device according to claim 2, characterized in that, A distance sensor (12) is mounted on the pressure plate (110), and a sealing ring is provided between the distance sensor (12) and the pressure plate (110).

4. The dynamic sealing device according to claim 2 or 3, characterized in that, The cap baffle (110) is connected to a cylinder (13) for driving the cap baffle (110) to move.

5. The dynamic sealing device according to claim 2 or 3, characterized in that, The sealing assembly includes sliding sealing rings disposed at both ends of the guide sleeve (105), the inner side of the sliding sealing rings being sealed against the outer wall of the moving rod; the outer periphery of the sliding sealing rings being sealed against the inner wall of the sealing cylinder (116).

6. The dynamic sealing device according to claim 5, characterized in that, A flat washer is provided between the sliding seal ring and the guide sleeve (105), and the flat washer is fitted on the moving rod body; the two ends of the sliding seal ring are respectively attached to the flat washer and the sealing cylinder (116) or the pressure cover baffle (110).

7. The dynamic sealing device according to claim 6, characterized in that, An anti-compression element is provided between the end of the guide sleeve (105) and the flat washer, and the other side of the anti-compression element is in close contact with the inner wall of the sealing cylinder (116).

8. A vacuum continuous casting equipment, characterized in that, It includes a feeding vacuum chamber (1), a casting vacuum chamber (2), a cooling vacuum chamber (8), and an atmospheric pressure chamber connected in sequence, wherein the atmospheric pressure chamber is provided with a dynamic sealing device as described in any one of claims 1 to 7.

9. The vacuum continuous casting equipment according to claim 8, characterized in that, The sealing cylinder (116) is screwed to the end of the cooling vacuum chamber (8) away from the melting and casting vacuum chamber (2); a sealing ring is provided between the end of the sealing cylinder (116) and the cooling vacuum chamber (8).

10. The vacuum continuous casting equipment according to claim 9, characterized in that, The atmospheric pressure chamber is equipped with a traction device (11), which works in conjunction with the moving rod to drive the moving rod to move.

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