Wax injection gun head sealing structure suitable for precision casting

Abstract

The utility model discloses a wax injection gun head sealing structure suitable for a precision casting, relates to the technical field of investment casting, and aims to solve the technical problem that part of liquid wax flows out when a muzzle of a wax injection gun is moved out after being used. A hollow wax injection pipe is arranged on the inner side of the insertion pipe and comprises a circulation pipe and a pressure maintaining pipe, the upper surface of the circulation pipe is fixedly connected with a contact block, and the outer surface of the circulation pipe is fixedly connected with a pressing plate. By controlling the connection between the communication opening and the communication groove below the insertion pipe, the communication between the wax injection pipe and the interior of the gun head body is further controlled, and when the contact block is pressed to drive the wax injection pipe to move and then reset, the sealing block at one end of the fixing rod is in contact with the sealing section inside the insertion pipe to seal the lower portion of the wax injection pipe. And the pressure in the wax injection pipe is kept, so that the liquid wax in the wax injection pipe is prevented from dripping after the wax injection pipe is used.

Description

Technical Field

[0001] The utility model relates to the technical field of investment casting, and more specifically to a wax injection gun head sealing structure suitable for precision castings. Background Art

[0002] Investment casting is also called lost wax casting, which includes the processes of pressing wax, trimming wax, forming trees, dipping slurry, melting wax, pouring molten metal and post-processing. Lost wax casting is to use wax to make a wax mold of the part to be cast, and then apply mud on the wax mold, which is the mud mold. After the mud mold is dried, put it into hot water to melt the wax mold inside. Take out the mud mold with melted wax mold and bake it into a ceramic mold. Once baked. Generally, a pouring port is left when making the mud mold, and then the molten metal is poured from the pouring port. After cooling, the required parts are made.

[0003] In the process of injecting liquid wax into a metal mold, a wax injection gun is required. The wax injection gun discharges liquid wax through the gun head and injects it into the metal mold. To ensure the stable injection of the liquid wax, a heating structure is usually provided inside the wax injection gun and at the gun head position to prevent the liquid wax from solidifying due to the temperature drop. Therefore, when the wax injection gun is withdrawn from the injection port of the metal mold after the injection molding is completed, liquid wax beads usually remain at the gun muzzle position of the wax injection gun. The process of removing the wax injection gun easily causes the liquid wax beads at the gun muzzle position to drip, which brings inconvenience to the cleaning work. In view of this, we propose a wax injection gun head sealing structure suitable for precision castings. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art, meet practical needs, and provide a wax injection gun head sealing structure suitable for precision castings to solve the technical problem that part of the liquid wax will flow out when the wax injection gun muzzle is removed after use.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a wax injection gun tip sealing structure suitable for precision castings, comprising a gun tip body, the upper end of the gun tip body is fixedly connected with a cannula, the inner side of the cannula is provided with a hollow wax injection tube, the wax injection tube comprises a circulation tube and a pressure-maintaining tube, the upper surface of the circulation tube is fixedly connected with a contact block, the outer surface of the circulation tube is fixedly connected with a pressure plate, the lower surface of the pressure plate is connected to the inner wall of the cannula through a reset spring, a connecting port is provided on the outer surface of the pressure-maintaining tube, a fixing rod is movably connected to the inner surface of the pressure-maintaining tube, a sealing block is provided at the upper end of the fixing rod, and the lower end of the fixing rod is fixedly connected to the gun tip body through a connecting rod.

[0006] The utility model further controls the connection between the wax injection tube and the inside of the gun head body by controlling the connection between the connecting port and the connecting groove below the insertion tube. When the contact block is pressed and drives the wax injection tube to move and reset, a sealing block at one end of the fixed rod contacts the connecting port and the sealing section inside the insertion tube to seal the bottom of the wax injection tube, thereby generating a certain suction effect, maintaining the pressure inside the wax injection tube to prevent the liquid wax inside the wax injection tube from dripping after use.

[0007] Preferably, the interior of the pressure-maintaining tube is connected to the interior of the circulation tube through a tapered pressure-maintaining port; the liquid wax is drained through the tapered pressure-maintaining port to avoid the influence of the internal cavity of the pressure-maintaining tube on the flow of the wax, and the pressure-maintaining effect is maintained after the upper part of the pressure-maintaining tube contacts the liquid wax through the pressure-maintaining port.

[0008] Preferably, a sealing section that fits with the outer surface of the pressure-maintaining tube is provided inside the insert tube, and the height of the connecting port on the outer surface of the pressure-maintaining tube is lower than the length of the sealing section; so that after the connecting port moves into the sealing section, the wax injection tube moves up and resets under closed conditions, thereby realizing the suction effect of the sealing block at the upper end of the fixed rod.

[0009] Preferably, an interface is provided at one end of the contact block, and a plurality of grooves are evenly formed on the inner wall of the interface to increase the contact area between the inner wall of the interface and the liquid wax, thereby increasing the adhesion of the liquid wax and preventing the liquid wax inside the interface from dripping.

[0010] Preferably, the interior of the outer wall of the cannula is hollow; during the continuous wax injection process, the interior of the outer wall of the cannula is heated and the temperature inside the cannula is reversely maintained, reducing the impact of the gradual decrease in temperature during the continuous wax injection on the wax injection.

[0011] Preferably, the sealing block is a multi-layer piston structure, which improves the sealing effect of the sealing block on the lower end of the pressure-maintaining tube.

[0012] Preferably, a communication groove is provided at the lower part of the interior of the insertion tube, and the fixing rod is located in the communication groove.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model further controls the connection between the wax injection tube and the inside of the gun head body by controlling the connection between the connecting port and the connecting groove below the cannula. When the contact block is pressed and drives the wax injection tube to move and reset, the sealing block at one end of the fixed rod contacts the connecting port and the sealing section inside the cannula to seal the bottom of the wax injection tube, thereby generating a certain suction effect to maintain the pressure inside the wax injection tube and avoid dripping of liquid wax inside the wax injection tube after use.

[0015] 2. The utility model also achieves drainage of liquid wax by designing a pressure-maintaining port structure, thereby avoiding the influence of the internal cavity of the pressure-maintaining tube on the flow of wax and maintaining the pressure-maintaining effect after the upper part of the pressure-maintaining tube contacts the liquid wax through the pressure-maintaining port. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the side sectional structure of the cannula of the utility model;

[0018] Figure 3 It is a schematic diagram of the pressure-maintaining port structure of the utility model.

[0019] Description of the numbers in the figure:

[0020] 1. Gun head body; 2. Insertion tube; 3. Wax injection tube; 301. Circulation tube; 302. Pressure-maintaining tube; 303. Connecting port; 304. Pressing plate; 305. Return spring; 306. Pressure-maintaining port; 4. Contact block; 401. Interface; 5. Fixing rod; 501. Connecting rod; 502. Sealing block. DETAILED DESCRIPTION

[0021] like Figures 1 to 3 As shown, the utility model relates to a wax injection gun tip sealing structure suitable for precision castings, including a gun tip body 1, the upper end of the gun tip body 1 is fixedly connected with a cannula 2, the inner side of the cannula 2 is provided with a hollow wax injection tube 3, the wax injection tube 3 includes a circulation tube 301 and a pressure-maintaining tube 302, the upper surface of the circulation tube 301 is fixedly connected with a contact block 4, the outer surface of the circulation tube 301 is fixedly connected with a pressure plate 304, the lower surface of the pressure plate 304 is connected to the inner wall of the cannula 2 through a reset spring 305, the outer surface of the pressure-maintaining tube 302 is provided with a connecting port 303, the inner surface of the pressure-maintaining tube 302 is movably connected with a fixing rod 5, the upper end of the fixing rod 5 is provided with a sealing block 502, and the lower end of the fixing rod 5 is fixedly connected to the gun tip body 1 through a connecting rod 501.

[0022] In an embodiment of the utility model, a sealing section that fits with the outer surface of the pressure-maintaining tube 302 is provided inside the insert tube 2, and the height of the connecting port 303 on the outer surface of the pressure-maintaining tube 302 is lower than the length of the sealing section. The interior of the outer wall of the insert tube 2 is hollow, the sealing block 502 is a multi-layer piston structure, a connecting groove is opened at the bottom of the interior of the insert tube 2, and the fixing rod 5 is located in the connecting groove.

[0023] In the embodiment of the present utility model, an interface 401 is provided at one end of the contact block 4 , and a plurality of grooves are evenly formed on the inner wall of the interface 401 .

[0024] As another embodiment of the present invention, the interior of the pressure-maintaining tube 302 is communicated with the interior of the flow tube 301 through a tapered pressure-maintaining port 306 .

[0025] Working principle: This embodiment provides a wax injection gun head sealing structure suitable for precision castings. When in use, the contact block 4 is connected to the wax injection port of the mold. First, the contact block 4 is pressed and drives the circulation tube 301 to move backward. At this time, the pressure plate 304 moves and compresses the reset spring 305 driven by the circulation tube 301 and forces it until the communication port 303 moves out of the closed section inside the insert tube 2 and enters the lower communication groove inside the insert tube 2, so that the circulation tube 301 is connected to the gun head body 1 through the communication port 303. At this time, liquid wax flows out from the inside of the gun head body 1. The wax passes through the internal connecting groove of the insert tube 2 and the connecting port 303 to enter the interior of the circulation tube 301, and flows out along the contact block 4. In the connection control between the connecting port 303 and the internal connecting groove of the insert tube 2, the automatic sealing control of the wax injection gun head before and after use is realized, and the influence of the internal cavity of the pressure-keeping tube 302 on the flow of liquid wax is reduced through the pressure-keeping port 306. After use is completed and the wax injection tube 3 is reset, the pressure-keeping effect of the pressure-keeping tube 302 and the sealing block 502 on the inside of the wax injection tube 3 is enhanced, and at the same time, the dripping of liquid wax is prevented under the action of the groove on the inner wall of the interface 401.

[0026] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A wax injection gun head sealing structure suitable for precision castings, comprising a gun head body (1), characterized in that: The upper end of the gun head body (1) is fixedly connected to a cannula (2), the inner side of the cannula (2) is provided with a hollow wax injection tube (3), the wax injection tube (3) comprises a circulation tube (301) and a pressure-maintaining tube (302), the upper surface of the circulation tube (301) is fixedly connected to a contact block (4), the outer surface of the circulation tube (301) is fixedly connected to a pressure plate (304), the lower surface of the pressure plate (304) is connected to the inner wall of the cannula (2) via a return spring (305), the outer surface of the pressure-maintaining tube (302) is provided with a connecting port (303), the inner surface of the pressure-maintaining tube (302) is movably connected to a fixing rod (5), the upper end of the fixing rod (5) is provided with a sealing block (502), and the lower end of the fixing rod (5) is fixedly connected to the gun head body (1) via a connecting rod (501).

2. The wax injection gun head sealing structure suitable for precision castings according to claim 1, characterized in that: The interior of the pressure-maintaining tube (302) is connected to the interior of the circulation tube (301) via a tapered pressure-maintaining port (306).

3. The wax injection gun head sealing structure suitable for precision castings according to claim 1, characterized in that: An interface (401) is provided at one end of the contact block (4), and a plurality of grooves are evenly arranged on the inner wall of the interface (401).

4. The wax injection gun head sealing structure suitable for precision castings according to claim 1, characterized in that: The insert tube (2) is provided with a sealing section inside thereof which is in contact with the outer surface of the pressure-maintaining tube (302), and the height of the communication opening (303) on the outer surface of the pressure-maintaining tube (302) is lower than the length of the sealing section.

5. The wax injection gun head sealing structure suitable for precision castings according to claim 1, characterized in that: The interior of the outer wall of the cannula (2) is hollow.

6. The wax injection gun head sealing structure suitable for precision castings according to claim 1, characterized in that: The sealing block (502) is a multi-layer piston structure.

7. The wax injection gun head sealing structure suitable for precision castings according to claim 1, characterized in that: A communication groove is provided at the lower part of the inside of the insertion tube (2), and the fixing rod (5) is located in the communication groove.

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