A mold structure for casting VTG pipe fittings

Abstract

This utility model relates to the field of VTG pipe casting technology and discloses a mold structure for casting VTG pipe fittings, including a pipe mold and a gravity hammer collar at the top of the pipe mold. An inner cover ring and an inner end cap are provided inside the pipe mold at the end furthest from the gravity hammer collar. The inner end cap is located between the inner cover ring and the gravity hammer collar. A gravity hammer mounting groove is provided at the top of the gravity hammer collar, and a gravity hammer assembly is provided inside the gravity hammer mounting groove. A rotating shaft is provided between the gravity hammer assembly and the gravity hammer collar. In this mold structure for casting VTG pipe fittings, a gravity hammer collar and a gravity hammer assembly are provided on the upper part of the outer end cap. The gravity hammer assembly rotates with the pipe mold. At this time, the weight of the hammer on the gravity hammer assembly is greater than the weight of the upper hook rod, causing it to unfold outwards. The arc surfaces of the inner hook plate and the outer hook plate are tightly pressed together, firmly pressing the outer end cap onto the top of the pipe mold, thus achieving automatic locking of the outer end cap.

Description

Technical Field

[0001] This utility model relates to the field of VTG pipe casting technology, specifically a mold structure for casting VTG pipe fittings. Background Technology

[0002] Currently, there are three manufacturing processes for centrifugal castings produced by VTG: vertical investment casting, vertical metal mold casting, and horizontal cantilever centrifugal casting. In the process of using horizontal cantilever centrifugal casting, components such as pipe molds and external end caps are required to cast VTG pipe fittings.

[0003] Traditionally, bolts are used to lock the outer end cap to the mold. However, this bolt-locking method requires disassembly after casting, making the process overly complex, failing to reduce operational difficulty, and thus lacking practicality. Therefore, we propose a mold structure for casting VTG pipe fittings. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a mold structure for casting VTG pipe fittings, thereby solving the problems mentioned in the background.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mold structure for casting VTG pipe fittings, comprising a pipe mold and a gravity hammer collar at the top of the pipe mold. An inner cover ring and an inner end cap are provided inside the pipe mold at the end furthest from the gravity hammer collar. The inner end cap is located between the inner cover ring and the gravity hammer collar. A gravity hammer mounting groove is provided at the top of the gravity hammer collar. A gravity hammer assembly is provided inside the gravity hammer mounting groove. A rotating shaft is provided between the gravity hammer assembly and the gravity hammer collar. A through hole adapted to the rotating shaft is provided inside the gravity hammer collar. An outer end cap is provided between the gravity hammer collar and the pipe mold. An outer hook plate and an inner hook plate are provided at the connection between the gravity hammer assembly and the outer end cap. The outer hook plate is fixedly connected to the outer end cap. The inner hook plate is located at the edge of the gravity hammer assembly facing the outer end cap.

[0006] Preferably, the gravity hammer collar and the tube mold are fixedly connected by four diagonally distributed locking bolts, and both the gravity hammer collar and the tube mold have threaded holes at their top ends that are threaded to the locking bolts.

[0007] Through the above technical solution, the four diagonally distributed locking bolts can firmly fix the gravity hammer collar and the pipe mold. The threaded connection not only ensures a strong connection, but also facilitates future disassembly and maintenance.

[0008] Preferably, the gravity hammer assembly includes an upper hook rod, an inclined connecting rod, and a hammer part. The upper hook rod, the inclined connecting rod, and the hammer part are integrally injection molded. There are four identical gravity hammer assemblies, which are symmetrically distributed on the upper side of the gravity hammer collar.

[0009] Preferably, the length of the inclined connecting rod is greater than the length of the upper hook rod, the angle between the inclined connecting rod and the upper hook rod is 115°, the counterweight protrudes outward from the outside of the inclined connecting rod, and the weight of the counterweight is greater than the weight of the upper hook rod.

[0010] Through the above technical solution, the upper hook rod, the inclined connecting rod, and the counterweight are integrally injection molded, resulting in higher overall structural strength. The connection points of the components are less prone to damage due to stress concentration, and the service life is longer. The four gravity hammer components are symmetrically distributed, which can generate balanced pressure during casting, allowing the casting material in the pipe mold to be subjected to uniform force, which helps to improve the forming effect of VTG casting pipes. The length and angle of the inclined connecting rod and the upper hook rod, combined with the weight of the counterweight, allow the gravity hammer components to perfectly press the edge of the outer end cap of the mold in a centrifugal state, realizing the automatic locking of the outer end cap.

[0011] Preferably, there are four identical outer hook plates and inner hook plates, which are symmetrically distributed about the center line of the tube mold. The cross-sections of the outer hook plates and inner hook plates are both arc-shaped. The inner diameter of the outer hook plate is larger than the outer diameter of the inner hook plate, and the outer hook plates and inner hook plates are interlocked.

[0012] With the above technical solution, the four outer hook plates and inner hook plates are symmetrically distributed, which allows the gravity hammer assembly and the outer end cap to be accurately aligned. The outer hook plates and inner hook plates with arc cross sections are more stable when hooked, ensuring a tight hook connection.

[0013] Preferably, the locking bolt passes through the gravity hammer collar and extends into the inside of the tube mold, and the threaded hole in the gravity hammer collar has the same size as the threaded hole in the tube mold.

[0014] Through the above technical solution, the locking bolt penetrates the gravity hammer collar and extends deep into the mold, which greatly improves the connection strength between the two and can effectively resist the loosening of the connection caused by the vibration of the mold during the casting process.

[0015] Preferably, the contact end between the inner end cap and the inner cover ring has a conical structure, the contact portion between the inner cover ring and the inner end cap has a conical opening structure, the inner end cap and the inner cover ring are connected by insertion, and the outer diameter of the inner end cap and the inner cover ring is consistent with the inner diameter of the tube mold.

[0016] With the above technical solution, the contact part between the inner cover ring and the inner end cover is a conical opening structure and the contact end between the inner end cover and the inner cover ring is a conical structure. During assembly, the two can be quickly and accurately aligned, avoiding installation misalignment problems and greatly improving assembly efficiency.

[0017] Compared with the prior art, this utility model provides a mold structure for casting VTG pipe fittings, which has the following beneficial effects: The mold structure for casting VTG pipe fittings has a gravity hammer collar and a gravity hammer assembly on the upper part of the outer end cap. The gravity hammer assembly rotates with the pipe mold. At this time, the weight of the hammer part on the gravity hammer assembly is greater than the weight of the upper hook rod, so it will unfold outward. The arc surfaces of the inner hook plate and the outer hook plate are tightly attached to each other, firmly pressing the outer end cap onto the top of the pipe mold, thus realizing the automatic locking of the outer end cap. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the outer end cap installation structure of this utility model; Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the half-section structure of the tube mold of this utility model. Figure 1 ; Figure 5 This is a schematic diagram of the half-section structure of the tube mold of this utility model. Figure 2 ; Figure 6 This is a schematic diagram of the half-section structure of the tube mold of this utility model. Figure 3 ; Figure 7 This is a three-dimensional structural diagram of the outer end cap of this utility model; Figure 8 This is a schematic diagram of the installation structure of the gravity hammer assembly of this utility model; Figure 9 This is a three-dimensional structural diagram of the gravity hammer assembly of this utility model.

[0019] The components are: 1. Tube mold; 2. Inner cover ring; 3. Inner end cover; 4. Outer end cover; 5. Gravity hammer collar; 6. Locking bolt; 7. Gravity hammer mounting groove; 8. Rotating shaft; 9. Gravity hammer assembly; 901. Upper hook rod; 902. Diagonal connecting rod; 903. Weight hammer part; 10. Outer hook plate; 11. Through hole; 12. Inner hook plate. Detailed Implementation

[0020] 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.

[0021] Example 1: like Figure 1-9 As shown, the present invention provides a mold structure for casting VTG pipe fittings, including a pipe mold 1 and a gravity hammer collar 5 at the top of the pipe mold 1. An inner cover ring 2 and an inner end cover 3 are provided at the end of the pipe mold 1 away from the gravity hammer collar 5. The inner end cover 3 is located between the inner cover ring 2 and the gravity hammer collar 5. A gravity hammer mounting groove 7 is provided at the top of the gravity hammer collar 5. A gravity hammer assembly 9 is provided inside the gravity hammer mounting groove 7. A rotating shaft 8 is provided between the gravity hammer assembly 9 and the gravity hammer collar 5. A through hole 11 adapted to the rotating shaft 8 is provided inside the gravity hammer collar 5 and the pipe mold 1. An outer end cover 4 is provided between the gravity hammer collar 5 and the pipe mold 1. An outer hook plate 10 and an inner hook plate 12 are provided at the connection between the gravity hammer assembly 9 and the outer end cover 4. The outer hook plate 10 is fixedly connected to the outer end cover 4. The inner hook plate 12 is located at the edge of the gravity hammer assembly 9 facing the outer end cover 4.

[0022] Specifically, the gravity hammer collar 5 and the tube mold 1 are fixedly connected by four diagonally distributed locking bolts 6. Both the gravity hammer collar 5 and the tube mold 1 have threaded holes at their top ends for threaded connection with the locking bolts 6. The advantage is that the four diagonally distributed locking bolts 6 can firmly fix the gravity hammer collar 5 and the tube mold 1, and the threaded connection not only ensures a strong connection but also facilitates future disassembly and maintenance.

[0023] Specifically, the locking bolt 6 passes through the gravity hammer collar 5 and extends into the interior of the tube mold 1. The threaded hole 13 inside the gravity hammer collar 5 is the same size as the threaded hole 13 inside the tube mold 1. The advantage is that the locking bolt passes through the gravity hammer collar and extends deep into the interior of the tube mold, which greatly improves the connection strength between the two and can effectively resist the loosening of the connection caused by the vibration of the mold during the casting process.

[0024] Specifically, the contact end between the inner end cap 3 and the inner cover ring 2 has a conical structure, and the contact portion between the inner cover ring 2 and the inner end cap 3 has a conical opening structure. The inner end cap 3 and the inner cover ring 2 are connected by an insertion joint, and the outer diameter of the inner end cap 3 and the inner cover ring 2 is consistent with the inner diameter of the tube mold 1. The advantage is that the conical opening structure of the contact portion between the inner cover ring 2 and the inner end cap 3, and the conical structure of the contact end between the inner end cap 3 and the inner cover ring 2, allow for quick and precise alignment during assembly, avoiding installation misalignment and significantly improving assembly efficiency.

[0025] Example 2: like Figure 2-9 As shown, as an improvement to the previous embodiment, in order to achieve automatic opening of the gravity hammer assembly 9.

[0026] Specifically, the gravity hammer assembly 9 includes an upper hook rod 901, an inclined connecting rod 902, and a hammer part 903. The upper hook rod 901, the inclined connecting rod 902, and the hammer part 903 are integrally injection molded. There are four identical gravity hammer assemblies 9, which are symmetrically distributed on the upper side of the gravity hammer collar 5. The length of the inclined connecting rod 902 is greater than the length of the upper hook rod 901, and the angle between the inclined connecting rod 902 and the upper hook rod 901 is 115°. The hammer part 903 protrudes outward from the outside of the inclined connecting rod 902, and the weight of the hammer part 903 is greater than the weight of the upper hook rod 901. The advantages are that the upper hook rod 901, the oblique connecting rod 902, and the counterweight 903 are integrally injection molded, resulting in higher overall structural strength. The connection points of the components are less prone to damage due to stress concentration, and the service life is longer. The four gravity hammer assemblies 9 are symmetrically distributed, which can generate balanced pressure during casting, so that the casting material in the pipe mold 1 is subjected to uniform force, which helps to improve the forming effect of VTG casting pipes. The length and angle of the oblique connecting rod 902 and the upper hook rod 901, combined with the weight of the counterweight 903, allow the gravity hammer assembly 9 to perfectly press the edge of the outer end cover 4 of the mold in a centrifugal state, realizing the automatic locking of the outer end cover 4.

[0027] Example 3: like Figure 2-9 As shown, as an improvement to the previous embodiment, in order to achieve precise positioning of the gravity hammer assembly 9 and the outer end cap 4.

[0028] Specifically, four identical outer hook plates 10 and inner hook plates 12 are provided, symmetrically distributed about the centerline of the mold 1. The cross-sections of both outer hook plates 10 and inner hook plates 12 are arc-shaped, with the inner diameter of the outer hook plate 10 larger than the outer diameter of the inner hook plate 12. The outer hook plates 10 and inner hook plates 12 are interlocked. The advantage is that the symmetrical distribution of the four outer hook plates 10 and inner hook plates 12 allows for accurate alignment of the gravity hammer assembly 9 and the outer end cap 4. The arc-shaped cross-sections of the outer hook plates 10 and inner hook plates 12 provide greater stability during interlocking, ensuring a tight connection.

[0029] Working principle: First, insert the inner cover ring 2 and the inner end cover 3 into the tube mold 1 in sequence. Then, fasten the outer end cover 4 onto the top of the tube mold 1. Next, use four diagonally opposite locking bolts 6 to fix the gravity hammer collar 5. When casting begins, the mold rotates around the central axis. The faster it rotates, the greater the centrifugal force. The weight of the hammer part 903 on the gravity hammer assembly 9 is greater than the weight of the upper hook rod 901, so it will unfold outward. At this time, the arc surfaces of the inner hook plate 12 and the outer hook plate 10 are in close contact, firmly pressing the outer end cover 4 onto the top of the tube mold 1, realizing the automatic locking of the outer end cover 4. The design is reasonable and convenient to use.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mold structure for casting VTG pipe fittings, comprising a pipe mold (1) and a gravity hammer collar (5) at the top of the pipe mold (1), characterized in that: The inner end cap (3) and inner cover ring (2) are provided at the end of the tube mold (1) away from the gravity hammer collar (5). The inner end cap (3) is located between the inner cover ring (2) and the gravity hammer collar (5). A gravity hammer mounting groove (7) is provided at the top of the gravity hammer collar (5). A gravity hammer assembly (9) is provided inside the gravity hammer mounting groove (7). A rotating shaft (8) is provided between the gravity hammer assembly (9) and the gravity hammer collar (5). The gravity hammer assembly (9) has a through hole (11) adapted to the rotating shaft (8) inside. An outer end cap (4) is provided between the gravity hammer collar (5) and the tube mold (1). An outer hook plate (10) and an inner hook plate (12) are provided at the connection between the gravity hammer assembly (9) and the outer end cap (4). The outer hook plate (10) and the outer end cap (4) are fixedly connected. The inner hook plate (12) is located at the edge of the gravity hammer assembly (9) facing the outer end cap (4).

2. The mold structure for casting VTG pipe fittings according to claim 1, characterized in that: The gravity hammer collar (5) and the tube mold (1) are fixedly connected by four diagonally distributed locking bolts (6). The top ends of the gravity hammer collar (5) and the tube mold (1) are provided with threaded holes (13) that are threadedly connected to the locking bolts (6).

3. The mold structure for casting VTG pipe fittings according to claim 1, characterized in that: The gravity hammer assembly (9) includes an upper hook rod (901), an inclined connecting rod (902), and a hammer part (903). The upper hook rod (901), the inclined connecting rod (902), and the hammer part (903) are integrally injection molded. There are four identical gravity hammer assemblies (9), which are symmetrically distributed on the upper side of the gravity hammer collar (5).

4. The mold structure for casting VTG pipe fittings according to claim 3, characterized in that: The length of the inclined connecting rod (902) is greater than the length of the upper hook rod (901), the angle between the inclined connecting rod (902) and the upper hook rod (901) is 115°, the counterweight part (903) protrudes outward from the outside of the inclined connecting rod (902), and the weight of the counterweight part (903) is greater than the weight of the upper hook rod (901).

5. The mold structure for casting VTG pipe fittings according to claim 1, characterized in that: The outer hook plate (10) and the inner hook plate (12) are provided in four identical forms. The four outer hook plates (10) and the inner hook plates (12) are symmetrically distributed about the center line of the tube mold (1). The cross-sections of the outer hook plate (10) and the inner hook plate (12) are both "arc-shaped". The inner diameter of the outer hook plate (10) is larger than the outer diameter of the inner hook plate (12). The outer hook plate (10) and the inner hook plate (12) are connected to each other.

6. The mold structure for casting VTG pipe fittings according to claim 2, characterized in that: The locking bolt (6) passes through the gravity hammer collar (5) and extends into the tube mold (1). The threaded hole (13) in the gravity hammer collar (5) is the same size as the threaded hole (13) in the tube mold (1).

7. The mold structure for casting VTG pipe fittings according to claim 1, characterized in that: The contact end of the inner end cap (3) and the inner cover ring (2) is conical, and the contact part of the inner cover ring (2) and the inner end cap (3) is conical open. The inner end cap (3) and the inner cover ring (2) are connected by insertion. The outer diameter of the inner end cap (3) and the inner cover ring (2) is consistent with the inner diameter of the tube mold (1).

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