Lift tube for low-pressure casting

Abstract

The utility model relates to a low-pressure cast riser tube which comprises a tube body, the pipe lug is arranged on the pipe body; the pipe cap is arranged on the pipe lug; wherein a mounting position is formed on the pipe cap; the mounting position forms an inclined surface; the pipe body penetrates through the pipe lug and is inserted into the installation position, and the inclined face pushes the pipe body to be attached to the pipe cap. The problem that in an existing scheme, leakage can happen to the welding position, and consequently the temperature of molten metal is lost is solved.

Description

Technical Field

[0001] This utility model relates to the field of casting equipment, and in particular to a riser pipe for low-pressure casting. Background Technology

[0002] Low-pressure casting involves introducing gas into a sealed crucible. The molten metal inside the crucible rises along the riser tube under the action of the gas and enters the mold cavity to solidify.

[0003] To facilitate the installation of the riser pipe, a cap and lug are welded directly onto the riser pipe. After prolonged use, leaks may occur at the welded locations, causing the molten metal to lose heat.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a low-pressure casting riser pipe to solve the problem of leakage at the welding position and loss of temperature of molten metal in the prior art.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A riser pipe manufactured under low pressure;

[0008] Includes: a tube body; a tube lug disposed on the tube body; and a tube cap disposed on the tube lug.

[0009] The tube cap has an installation position; the installation position has an inclined surface; the tube body passes through the tube lug and is inserted into the installation position, and the inclined surface pushes the tube body to fit against the tube cap.

[0010] A further technical solution is to form a first step around the tube body, and the tube lug is fitted onto the first step and abuts against the first step.

[0011] A further technical solution is to form a second step around the tube body, such that the thickness of the tube body at the end inserted into the mounting position is less than the thickness of the tube body at the end away from the mounting position.

[0012] A further technical solution is that the tube lugs are respectively welded to the tube body and the tube cap.

[0013] A further technical solution is that the lug is threaded onto the first step.

[0014] A further technical solution is that the thickness of the tube body inserted into the mounting position is negatively correlated with the inclination angle of the inclined surface.

[0015] A further technical solution is to form a first convex tooth along the inclined surface, and to provide a second convex tooth at one end of the tube body inserted into the mounting position, wherein the first convex tooth and the second convex tooth mesh with each other.

[0016] A further technical solution is that the tube ear abuts against one end of the first step to form a cut, and a protrusion is provided on the first step; the protrusion is inserted into the cut.

[0017] Compared with the prior art, the beneficial technical effects of this utility model are as follows: (1) Since the tube ear is fitted on the tube body and the tube body is inserted into the tube cap, the tube body, tube ear and tube cap are tightly fitted, and the positioning and installation accuracy between the tube body and tube cap is high and they can fit completely, so that the airtightness of the low pressure casting riser tube is high and no temperature loss will occur.

[0018] (2) Due to the thinning of the upper end of the pipe, when the pipe is inserted into the cap, the inclined surface forms a horizontal thrust on the pipe, and the upper end of the pipe can deform to a certain extent, so that the upper end of the pipe can completely fit the cap, avoiding leakage between the pipe and the cap and improving the sealing performance.

[0019] (3) By adjusting the thickness of the pipe body at the installation end and the inclination angle of the inclined surface, the inclination angle of the pipe body at the installation end can be maintained at a reasonable deformation amount, so as to avoid excessive deformation of the pipe body at the installation end and the resulting cracks, thereby affecting the airtightness of the low-pressure casting riser pipe.

[0020] (4) When the tube body is inserted into the installation position, the first and second convex teeth mesh with each other to prevent the tube body and the cap from separating, thus improving the airtightness of the riser tube of the low-pressure casting.

[0021] (5) The tube lug is threaded onto the pipe body and abuts against the first step to limit the vertical position of the tube lug. The horizontal position of the tube lug is limited by the protrusion, which improves the fitting and installation accuracy between the tube lug and the pipe body. Attached Figure Description

[0022] Figure 1 A schematic diagram of the riser pipe of the first embodiment of the present invention is shown.

[0023] Figure 2 A schematic diagram of the tube body according to the first embodiment of this utility model is shown.

[0024] Figure 3 A schematic diagram of the tube lug of the first embodiment of this utility model is shown.

[0025] Figure 4A schematic diagram of the cap structure according to the first embodiment of this utility model is shown.

[0026] Figure 5 A schematic diagram of the riser pipe of the second embodiment of the present invention is shown.

[0027] Figure 6 It shows Figure 5 Enlarged structural diagram at point A in the middle.

[0028] Figure 7 It shows Figure 5 Enlarged structural diagram at point B in the middle.

[0029] The following labels are used in the attached diagram: 1. Pipe body; 11. First step; 12. Second step; 13. Second tooth; 14. Protrusion; 2. Pipe lug; 21. Cutout; 3. Pipe cap; 31. Mounting position; 32. Inclined surface; 33. First tooth. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the device proposed by this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer according to the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, only used to conveniently and clearly assist in illustrating the purpose of the embodiments of this utility model. Please refer to the accompanying drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification, for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0031] First embodiment:

[0032] Figure 1 A schematic diagram of the riser pipe of the first embodiment of the present invention is shown. Figure 2 A schematic diagram of the tube body according to the first embodiment of this utility model is shown. Figure 3 A schematic diagram of the tube lug of the first embodiment of this utility model is shown. Figure 4 A schematic diagram of the cap structure according to the first embodiment of this utility model is shown. (Combined with...) Figures 1-4 As shown, this utility model discloses a low-pressure casting riser pipe.

[0033] The riser pipe of low-pressure casting includes: pipe body 1, pipe lug 2 provided on pipe body 1 and pipe cap 3 provided on pipe lug 2.

[0034] The lower surface of the cap 3 forms a mounting position 31, and the outer edge of the mounting position 31 forms a bevel 32. The pipe body 1 is a through-type structure, and both the lug 2 and the cap 3 are horizontally positioned. The cap 3 is located above the lug 2.

[0035] The tube body 1 passes through the lug 2 from below and is inserted into the mounting position 31 from below, with the upper end of the tube body 1 contacting the inclined surface 32. As the tube body 1 is pushed upward, the inclined surface 32 exerts a horizontal thrust on the tube body 1, causing the tube body 1 to fit against the cap 3, thereby completing the positioning and installation between the tube body 1 and the cap 3.

[0036] Because the lug 2 is fitted onto the tube body 1 and the tube body 1 is inserted into the cap 3, the tube body 1, lug 2 and cap 3 fit together tightly. The high positioning accuracy between the tube body 1 and cap 3 allows them to fit completely together, resulting in high airtightness of the low-pressure cast liquid riser tube and preventing temperature loss.

[0037] A first step 11 is formed around the upper end of the outer surface of the tube body 1. When the tube body 1 passes through the tube ear 2, the tube ear 2 is fitted onto the first step 11. The lower surface of the tube ear 2 abuts against the first step 11, which restricts the position of the tube ear 2.

[0038] A second step 12 is formed around the upper end of the inner surface of the tube body 1. Because the upper end of the tube body 1 is simultaneously machined with the first step 11 and the second step 12, the thickness of the end of the tube body 1 that inserts into the mounting position 31 is less than the thickness of the end of the tube body 1 furthest from the mounting position 31. Due to the reduced thickness at the upper end of the tube body 1, when the tube body 1 is inserted into the cap 3, the inclined surface 32 exerts a horizontal thrust on the tube body 1, allowing the upper end of the tube body 1 to deform to a certain extent. This ensures that the upper end of the tube body 1 completely fits the cap 3, preventing leakage between the tube body 1 and the cap 3 and improving the sealing performance.

[0039] The tube lug 2 is welded to the tube body 1 and the tube cap 3 respectively, so that the tube body 1, tube lug 2 and tube cap 3 are a whole, to avoid loosening between the tube body 1, tube lug 2 and tube cap 3, which would affect the sealing performance of the riser tube of low pressure casting.

[0040] The lug 2 is threaded onto the first step 11. After tightening the tube body 1, the lug 2 can fit tightly against the first step 11. Tightening the tube body 1 can adjust the vertical position of the tube body 1, thereby adjusting the relative position between the tube body 1, the lug 2 and the cap 3, ensuring the assembly accuracy between the tube body 1, the lug 2 and the cap 3.

[0041] The thickness of the end of the tube body 1 inserted into the mounting position 31 is negatively correlated with the inclination angle of the inclined surface 32. The larger the inclination angle of the inclined surface 32, the greater the deformation of the end of the tube body 1 inserted into the mounting position 31, and the thinner the thickness of that end of the tube body 1 inserted into the mounting position 31 needs to be. The smaller the inclination angle of the inclined surface 32, the smaller the deformation of the end of the tube body 1 inserted into the mounting position 31, and the thicker the thickness of that end of the tube body 1 inserted into the mounting position 31 needs to be.

[0042] By adjusting the thickness of the end of the tube body 1 inserted into the installation position 31 and the inclination angle of the inclined surface 32, the inclination angle of the end of the tube body 1 inserted into the installation position 31 and the inclined surface 32 can be maintained within a reasonable amount of deformation, thus avoiding excessive deformation of the end of the tube body 1 inserted into the installation position 31 and the resulting cracks, which would affect the airtightness of the riser tube of the low-pressure casting.

[0043] Second embodiment:

[0044] Figure 5 A schematic diagram of the riser pipe of the second embodiment of the present invention is shown. Figure 6 It shows Figure 5 Enlarged structural diagram at point A in the middle. Figure 7 It shows Figure 5 A magnified structural diagram at point B. (Combined with...) Figures 1-6 The first embodiment differs from the second embodiment in that:

[0045] A first protruding tooth 33 is formed in parallel along the inclined surface 32, and the first protruding tooth 33 is arranged in the front-rear direction. A second protruding tooth 13 is provided at one end of the tube body 1 that is inserted into the mounting position 31. For example, both the first protruding tooth 33 and the second protruding tooth 13 are annular. When the tube body 1 is inserted into the mounting position 31, the first protruding tooth 33 and the second protruding tooth 13 engage with each other, preventing the tube body 1 and the tube cap 3 from separating, thus improving the airtightness of the riser tube of the low-pressure casting.

[0046] A notch 21 is formed at one end of the lug 2 abutting against the first step 11, and the notch 21 is formed on the lower surface of the lug 2. A protrusion 14 is provided on the first step 11. After the lug 2 is threaded onto the pipe body 1 and tightened, the protrusion 14 is inserted into the notch 21, and the protrusion 14 restricts the horizontal direction of the lug 2. By threading the lug 2 onto the pipe body 1 and abutting against the first step 11 to restrict the vertical position of the lug 2, and by restricting the horizontal position of the lug 2 through the protrusion 14, the fitting and installation accuracy between the lug 2 and the pipe body 1 is improved.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A low pressure casting riser characterized by, The utility model relates to a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided.

2. The low pressure casting riser of claim 1, wherein, The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided.

3. The low pressure casting riser of claim 2, wherein, The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided.

4. The low pressure casting riser of claim 2, wherein, The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided.

5. The low pressure casting riser of claim 4, wherein, The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided.

6. The low pressure casting riser of claim 3, wherein, The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided.

7. The low pressure casting riser of claim 2, wherein, The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided.

8. The low pressure casting riser of claim 2, wherein, The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3) are provided. The utility model discloses a pipe body (1) and a pipe lug (2) and a pipe cap (3

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