A gas-tightness detection device for aluminum alloy differential pressure casting riser pipe

Abstract

The invention discloses an airtightness detection device for an aluminum alloy differential pressure casting riser pipe, aiming to provide an airtightness detection device for an aluminum alloy differential pressure casting riser pipe that is easy to operate. The device comprises a water tank with an open upper end, a bottom plate for supporting and closing the flange at the lower end of the riser pipe, a cover plate for closing the upper end of the riser pipe, a quick-change joint, a manual reversing valve, an air source processor, and three connecting rods; the bottom plate is placed at the bottom of the water tank, a rubber sealing pad for the airtight flange at the lower end of the riser pipe is arranged at the upper end of the bottom plate, a gasket for the airtight upper end of the riser pipe is arranged at the lower end of the cover plate, the quick-change joint is airtightly connected to the middle of the cover plate, the outlet end of the manual reversing valve is connected to the quick-change joint through a first air pipe, the inlet end of the manual reversing valve is connected to the outlet end of the air source processor through a second air pipe, and the inlet end of the air source processor is connected to the air source air pipe; the three connecting rods are equally arranged in a ring, and their lower ends are fixedly connected to the bottom plate.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy differential pressure casting equipment, and in particular to an airtightness detection device for an aluminum alloy differential pressure casting riser pipe. Background Art

[0002] In the existing aluminum alloy differential pressure casting, the riser pipe passes through the middle partition to transport the aluminum alloy melt to the upper casting mold. The riser pipe needs to be sealed with the middle partition and the casting bottom plate to ensure the pressure difference between the upper and lower tanks and to ensure that the alloy liquid does not involve gas during the pouring process. Since the riser pipe is welded with steel pipes and steel flanges, the materials of the two welds are different from those of the steel pipes and steel flanges. Before pouring, the riser pipe must be heated to 750-950℃ in a baking furnace. Only during pouring can the temperature of the riser pipe be basically consistent with the temperature of the aluminum alloy liquid, which will not affect the temperature of the alloy liquid and cast qualified castings.

[0003] The riser pipe is in an environment where high temperature and normal temperature change for a long time. The steel pipe, steel flange and weld will expand after being heated. Due to the different expansion coefficients, some riser pipe welds will crack and leak. Another reason is that the welding quality is not up to standard and the weld will also leak. If the leaking riser pipe is not detected in time, during pouring, the gas will enter the casting along the leaking place of the weld, causing the cast casting to be scrapped due to the formation of pores, causing great economic losses to the production company.

[0004] Therefore, how to design a tool that can quickly detect and find the air leakage problem of the weld of the aluminum alloy differential pressure casting riser pipe has become a difficult problem. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an airtightness detection device for an aluminum alloy differential pressure casting riser pipe with convenient and fast detection operation.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] A gas tightness detection device for an aluminum alloy differential pressure casting riser pipe, comprising a water tank with an open upper end, a bottom plate for supporting and closing the flange at the lower end of the riser pipe, a cover plate for closing the upper end of the riser pipe, a quick-change joint, a manual reversing valve, an air source processor, and three connecting rods; the bottom plate is placed at the bottom of the water tank, a rubber sealing gasket for the air-tight flange at the lower end of the bottom plate is arranged, a gasket for the air-tight upper end of the riser pipe is arranged at the lower end of the cover plate, the quick-change joint is air-tightly connected to the middle part of the cover plate, the outlet end of the manual reversing valve is connected to the quick-change joint through a first air pipe, the inlet end of the manual reversing valve is connected to the outlet end of the air source processor through a second air pipe, and the inlet end of the air source processor is connected to the air source air pipe; the three connecting rods are equally divided in a ring, the lower ends of the three connecting rods are fixedly connected to the bottom plate, the upper ends are provided with threaded sections and pass through the cover plate respectively; nuts are screwed on the upper threaded sections of the connecting rods.

[0008] Specifically, the connecting rod is connected to the base plate by means of threads.

[0009] Specifically, the quick-change connector is connected to the cover plate by threading.

[0010] Specifically, the gasket is a polytetrafluoroethylene coated gasket.

[0011] Specifically, the gasket and the cover plate are connected by bonding.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. The present invention can quickly discover the leakage problem of the weld of the aluminum alloy differential pressure casting riser pipe, so as to take timely repair measures for the problematic riser pipe, and effectively avoid the problem that the cast casting is scrapped due to the inclusion of air holes due to the leakage of the riser pipe.

[0014] 2. The present invention has a simple structure and strong practicability, and can be applied to the air tightness detection of riser pipes of different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the structure when the present invention is used.

[0017] Figure 2 for Figure 1 Left view of .

[0018] Figure 3 A cross-sectional view of the riser tube.

[0019] Figure 4 It is a three-dimensional diagram of the present invention, in which some components are omitted.

[0020] Figure 5 for Figure 1 Stereoscopic diagram. DETAILED DESCRIPTION

[0021] In order to more clearly explain the purpose, technical solution and advantages of the present invention, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention described below, all other embodiments obtained by ordinary technicians in this field without paying creative work belong to the scope of protection of the present invention.

[0022] In the description of the present invention, the technical terms or scientific terms used should be the common meanings understood by people with general skills in the technical field to which the present invention belongs. It should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "set" and the like should be understood in a broad sense. For example, it can be fixedly connected or set, or it can be detachably connected or set, or it can be connected or set in one piece. The terms "connect" or "connected" and similar words are not limited to physical or mechanical connections, but can also include electrical connections. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The terms "include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The directions or positional relationships indicated by terms such as “center”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0023] Meanwhile, in order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits detailed descriptions of known functions and known components.

[0024] As shown in the accompanying drawings, the airtightness detection device for the aluminum alloy differential pressure casting riser pipe of the present invention comprises a water tank 7 with an open upper end, a bottom plate 9 for supporting and closing the flange at the lower end of the riser pipe, a cover plate 12 for closing the upper end of the riser pipe, a quick-change joint 4, a manual reversing valve 6, an air source processor 2, and three connecting rods 11; the bottom plate 9 is placed at the bottom of the water tank 7, a rubber sealing pad 14 for air-sealing the flange at the lower end of the riser pipe is arranged at the upper end of the bottom plate 9, and a rubber sealing pad 14 for air-sealing the flange at the lower end of the riser pipe is arranged at the lower end of the cover plate 12. Gasket 13, the quick-change connector 4 is airtightly connected to the middle of the cover plate 12, the outlet end of the manual reversing valve 6 is connected to the quick-change connector 4 through the first air pipe 5, the inlet end of the manual reversing valve 6 is connected to the outlet end of the air source processor 2 through the second air pipe 3, and the inlet end of the air source processor 2 is connected to the air source air pipe 1; the three connecting rods 11 are equally arranged in a ring, the lower ends of which are fixedly connected to the bottom plate 9, and the upper ends are provided with threaded sections 111 and are respectively passed through the cover plate 12 and connected to the screw nuts 10.

[0025] In this embodiment, the connecting rod 11 is connected to the bottom plate 9 by means of threads, and it is obvious that other commonly used connection methods such as snap-on connection can also be used.

[0026] In this embodiment, the quick-change connector 4 is connected to the cover plate 12 by threading. Obviously, other commonly used connection methods such as snap-on connection can also be used.

[0027] In this embodiment, the gasket 13 is preferably a polytetrafluoroethylene-coated gasket. The gasket 13 and the cover plate 12 are preferably connected by bonding.

[0028] The working process is as follows:

[0029] A certain amount of water is injected into the water tank 7, preferably so that the water surface 8 submerges the lower flange of the liquid riser 15, the bottom plate 9 and the three connecting rods 11 are connected and locked by threaded means, and after the rubber sealing pad 14 is placed on the bottom plate 9, the bottom plate 9 is placed in the water tank 7; the quick-change joint 4 is fixed on the upper end surface of the cover plate 12, and the polytetrafluoroethylene-coated gasket 13 is fixed on the lower end surface of the cover plate 12, the quick-change joint 4 and the manual reversing valve 6 are connected by the first air pipe 5, the manual reversing valve 6 is connected to the air source processor 2 by the second air pipe 3, the air source processor 2 is connected to the air source air pipe 1, the air source switch is turned on to allow compressed air to pass into the air source air pipe 1, and the pressure of the air source processor 2 is adjusted to 0.6MPa; then the liquid riser 15 is fixed. The flange 16 is placed vertically in the middle of the bottom plate 9 and in close contact with the rubber gasket 14. The assembled and connected cover plate 12 is aligned with the connecting rod 11 and placed on the upper end of the liquid riser 15. The connecting rod 11 is locked with the nut 10 so that the cover plate 12 is pressed against the upper end of the liquid riser. The handle of the manual reversing valve 6 is rotated to allow compressed air to enter the liquid riser 15, and the liquid riser 15 is tested for air tightness. When the flange weld 17 of the liquid riser 15 is not leaking, the liquid riser 15 can be taken out for use. If it is leaking, the liquid riser 15 is taken out for repair welding and then tested for air tightness again until the weld 17 is not leaking before it can be put into use.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. For those skilled in the art, any modification, equivalent replacement and improvement of the technical solutions or partial technical features recorded in the above specific embodiments within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air tightness detection device for an aluminum alloy differential pressure casting riser pipe, comprising a water tank (7) with an open upper end, a bottom plate (9) for supporting and sealing a flange at the lower end of the riser pipe, a cover plate (12) for sealing the upper end of the riser pipe, a quick-change joint (4), a manual reversing valve (6), an air source processor (2), and three connecting rods (11); characterized in that: The bottom plate (9) is placed at the bottom of the water tank (7); a rubber sealing pad (14) for the flange at the lower end of the airtight liquid-lifting pipe is arranged at the upper end of the bottom plate (9); a gasket (13) for the upper end of the airtight liquid-lifting pipe is arranged at the lower end of the cover plate (12); the quick-change joint (4) is airtightly connected to the middle of the cover plate (12); the outlet end of the manual reversing valve (6) is connected to the quick-change joint (4) via a first air pipe (5); the inlet end of the manual reversing valve (6) is connected to the outlet end of the air source processor (2) via a second air pipe (3); the inlet end of the air source processor (2) is connected to the air source air pipe (1); the three connecting rods (11) are equally spaced in a ring; the lower ends of the connecting rods (11) are fixedly connected to the bottom plate (9); the upper ends are provided with threaded sections (111) and pass through the cover plate (12) respectively; nuts (10) are screwed onto the upper threaded sections (111) of the connecting rods (11); The quick-change connector (4) is connected to the cover plate (12) by threading; The gasket (13) is a polytetrafluoroethylene coated gasket.

2. The airtightness detection device for the aluminum alloy differential pressure casting riser tube according to claim 1, characterized in that: The connecting rod (11) is connected to the bottom plate (9) by means of threads.

3. The airtightness detection device for the aluminum alloy differential pressure casting riser tube according to claim 1 or 2, characterized in that: The gasket (13) and the cover plate (12) are connected by bonding.

Images