A self-cleaning air channel function gas needle for casting
By designing an air-punching needle with a built-in cleaning airway, the problem of low efficiency in cleaning loose sand from the air-punching needle channel was solved, achieving efficient cleaning of the synchronous blowing and punching process, reducing sand hole defects in castings, and improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 华东泰克西汽车铸造有限公司
- Filing Date
- 2025-07-04
- Publication Date
- 2026-07-10
AI Technical Summary
In the existing casting process, the efficiency of cleaning loose sand in the air needle channel is low, which affects production efficiency and may generate more loose sand, leading to sand hole defects in the casting.
Design a puncture needle with built-in airway cleaning function, including a needle tip, a needle body and an air tube connector. The needle body has an air guide chamber and an air blowing hole inside. The outer surface of the needle tip has a spherical pit and is connected to the needle body by a threaded connection. During the puncture process, the needle is purged and cleaned simultaneously.
It improved cleaning efficiency, reduced the proportion of sand hole defects, increased production efficiency, and reduced the generation of loose sand.
Smart Images
Figure CN224475605U_ABST
Abstract
Description
Technical Field
[0001] This article belongs to the technical field of casting puncture needles, specifically designing a casting puncture needle with a built-in air cleaning function. Background Technology
[0002] Currently, in the casting industry, during the molding process of castings produced by the wet mold sand process, air needles are used to prick vent holes in the upper mold sand to expel gas from the cavity and improve the porosity defects of the casting. However, during the needle-pricking process, loose sand will be generated in the venting channel of the cavity. If this loose sand is not cleaned up, the residual sand in the air channel will fall into the cavity when the mold is closed, causing the casting to have sand hole defects.
[0003] Currently, the loose sand in the upper air needle channel is generally cleaned using the following methods in the industry:
[0004] 1. Using an air gun: such as Figure 9 As shown, use compressed air to blow through the air gun into the needle channel, using the high-pressure airflow to blow out the stuck sand. You can start by blowing from one end of the channel; if the effect is not good, then blow from the other end to ensure that the sand is completely blown out.
[0005] 2. Acupuncture and moxibustion: such as... Figure 10 As shown, select a suitable needle and carefully insert it into the air needle channel. Gently poke back and forth to loosen the stuck sand. Then, use an air gun to blow or vibrate to expel the sand.
[0006] However, the drawbacks of these methods are also obvious:
[0007] The air gun cannot be fully inserted into the air passage and the angle cannot be adjusted to blow away the sand; poking back and forth with a cleaning needle may produce more loose sand; cleaning the sand in the air passage can only be done after all the ventilation holes in the cavity have been punctured, which is inefficient.
[0008] Therefore, the above methods are unreliable and affect production efficiency, and may even generate more loose sand. Utility Model Content
[0009] To address the aforementioned issues, this paper proposes a purging needle for casting with a built-in cleaning air passage. The purging needle comprises a needle tip, a needle body, and an air pipe connector. The needle body is a hollow cylinder, including a needle rod, air holes, a connecting end, and an air guide cavity. The internal end of the needle body has an air guide cavity that is open at both ends, and an air pipe connector is open on the outer side of one end. The other end of the needle body is connected to the needle tip via a threaded seal. The surface of the needle body has several air holes arranged in an array, which are interconnected with the air guide cavity inside the needle body. The needle tip includes a pointed tip, spherical recesses, and a mounting screw. The outer surface of the needle tip has several spherical recesses arranged in an array, and the end of the needle tip is sealed to the end of the needle body via a protruding mounting screw. The purging channel enters the exhaust channel during the purging process for deep purging and cleaning. The purging process and the purging of the exhaust channel by the purging needle are performed simultaneously, eliminating the need to wait until all the air holes are purged before purging, thus improving efficiency.
[0010] The tip is cone-shaped, with several spherical pits evenly spaced on its outer surface. A mounting screw is vertically positioned at the center of the tip's end, and the tip is securely connected to the needle body via the mounting screw. The spherical pits are semi-circular in shape, with a diameter of less than 2 millimeters. The spherical pits are arranged in a circular pattern on the tip's surface from top to bottom. The tiny spherical pits on the needle tip provide a sand-crushing function during needle insertion, improving the blowing effect. The finer the sand, the easier it is to clean.
[0011] The connecting end is a tapered end with an outward curve. The inner surface of the air guide chamber on the inner side of the connecting end is threaded. The inside of the connecting end is connected to the mounting screw of the needle tip through the thread. At the same time, the needle tip and the main body are designed separately, which makes it easy to replace the needle tip and reduces costs. After all, the needle tip is more prone to wear and needs to be replaced more frequently than the main body.
[0012] The air vent is a cylindrical hole with a through-hole. One end of the air vent is connected to the outside of the needle body, and the other end is connected to the inside of the air guide cavity. The new air piercing needle was tested to verify its efficiency and the proportion of sand hole defects. After trial pouring, the cleaning efficiency of the air piercing needle with its own cleaning air passage function was twice that of the previous air gun or needle cleaning method, and the waste material from sand holes was reduced by 0.25% compared to before.
[0013] Beneficial effects:
[0014] The purging channel enters the exhaust channel for deep purging and cleaning during the needle insertion process. The purging process and the needle insertion process of the exhaust channel are carried out simultaneously, without having to wait until all the vent holes are inserted before purging, which improves efficiency.
[0015] The needle tip features a tiny spherical indentation that breaks up sand during the needle insertion process, improving the blowing effect. The finer the sand, the easier it is to blow it away.
[0016] Meanwhile, the separate design of the needle tip and needle body makes it easy to replace the needle tip and reduces costs, since the needle tip is more prone to wear and needs to be replaced more frequently than the main body.
[0017] The new air-punching needle was tested and its efficiency and the proportion of sand hole defects were verified. After trial pouring, the cleaning efficiency of the air-punching needle with its own cleaning air passage function was twice that of the previous air gun or needle method, and the waste of sand hole material was reduced by 0.25% compared with the previous method. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of a puncture needle for casting with a built-in air passage cleaning function;
[0019] Figure 2 This is a schematic diagram of the tip of a puncture needle for casting with a built-in air passage cleaning function;
[0020] Figure 3 This is a schematic diagram of a casting-grade puncture needle with a built-in airway cleaning function;
[0021] Figure 4 This is a cross-sectional view of the connection between the tip and body of a casting-grade air-puncturing needle with a built-in air passage cleaning function.
[0022] Figure 5 This is a cross-sectional view of a puncture needle for casting with a built-in cleaning air passage function;
[0023] Figure 6 This is a magnified schematic diagram of the tip of a puncture needle with a built-in air passage cleaning function used in casting.
[0024] Figure 7 This is a schematic diagram of a casting puncture needle with a built-in air passage cleaning function.
[0025] Figure 8 This is a partially enlarged working schematic diagram of a puncture needle for casting with a built-in cleaning air passage function;
[0026] Figure 9 This is a schematic diagram of an existing air needle channel air gun;
[0027] Figure 10 This is a schematic diagram of the existing air needle channel unblocking method;
[0028] In the diagram: 1. Needle tip, 11. Pointed tip, 12. Spherical pit, 13. Mounting screw, 2. Needle body, 21. Needle rod, 22. Air inlet, 23. Connecting end, 24. Air guide chamber, 3. Air pipe connector, 4. Air needle, 5. Sanding pad, 6. Air outlet. Detailed Implementation
[0029] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.
[0030] Needle tip 1, pointed tip 11, spherical recess 12, mounting screw 13, needle body 2, needle rod 21, air blowing hole 22, connecting end 23, air guiding chamber 24, air pipe connector 3, air puncture needle 4, sanding pad 5, air outlet 6.
[0031] like Figure 1 , 2 As shown in 3, 4, 5, 6, 7, and 8;
[0032] A casting puncture needle 4 with a built-in cleaning airway function includes a needle tip 1, a needle body 2, and an air pipe connector 3. The needle body 2 is a hollow cylinder, including a needle rod 21, air holes 22, a connecting end 23, and an air guide cavity 24. The air guide cavity 24 is provided at both ends of the needle body 2, and the air pipe connector 3 is provided on the outer side of one end of the needle body 2. The other end of the needle body 2 is connected to the needle tip 1 by a threaded seal. A plurality of air holes 22 are arranged in an array on the surface of the needle body 2, and the air holes 22 are interconnected with the interior of the air guide cavity 24 inside the needle body 2. The needle tip 1 includes a pointed tip 11, a spherical recess 12, and a mounting screw 13. A plurality of spherical recesses 12 are arranged in an array on the outer surface of the needle tip 1, and the end of the needle tip 1 is connected to the end of the needle body 2 by a protruding mounting screw 13. The needle tip 11 is conical in shape, with several spherical pits 12 arranged in an equidistant array on its outer surface. A mounting screw 13 is vertically mounted at the center of the tip 11. The tip 11 is locked to the needle body 2 by the mounting screw 13. The connecting end 23 is tapered in shape, with threads on the inner surface of the air guide cavity 24 on the inner side of the connecting end 23. The interior of the connecting end 23 is connected to the mounting screw 13 of the needle tip 1 by the threads. The spherical pits 12 are semi-circular in shape, with a diameter of less than 2 mm. The spherical pits 12 are arranged in a ring on the surface of the tip 11 from top to bottom. The air outlet 22 is a cylindrical hole with one end connected to the outside of the needle body 2 and the other end connected to the inside of the air guide cavity 24.
[0033] Implementation example;
[0034] The complete solid air needle is divided into two parts, namely the needle head and the needle body 2, which are connected by threads. The outer surface of the needle head has tiny spherical pits 12, which are designed to increase the friction coefficient of the needle head and have a sand-breaking function during the needle insertion process. This facilitates the improvement of the effect of the needle body in blowing and cleaning the exhaust channel. The finer the sand, the easier it is to blow it clean. The needle body 2 is a cavity design, and the outer wall of the needle body 2 is covered with multiple air holes 22. When this air needle 4 with its own air channel cleaning function is used to insert air holes, the needle head first breaks the sand, and then the main body deeply blows the loose sand on the inner wall of the exhaust channel. The blowing and cleaning work is completed in the process of needle insertion.
[0035] During the process of inserting the needle into the airway, tiny circular pits on the outer surface of the needle first grind the sand on the inner wall of the airway into fine sand fragments. At the same time, the airflow blows outward from the needle body, which is covered with multiple air holes 22, to sweep the inner wall of the airway. The multi-layer exhaust hole design will thoroughly sweep the fine sand and loose sand on the inner wall of the airway.
[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A puncture needle for casting with a built-in air passage cleaning function, characterized in that, The aforementioned air-puncture needle includes a needle tip, a needle body, and an air tube connector. The needle body is a hollow cylinder, comprising a needle shaft, air inlets, a connecting end, and an air guide cavity. The air guide cavity is provided at both ends of the needle body, and an air tube connector is provided on the outer side of one end of the needle body. The other end of the needle body is connected to the needle tip via a threaded seal. Several air inlets are arranged in an array on the surface of the needle body, and the air inlets are interconnected with the air guide cavity inside the needle body. The needle tip includes a pointed tip, a spherical recess, and a mounting screw. Several spherical recesses are arranged in an array on the outer surface of the needle tip, and the end of the needle tip is sealed to the end of the needle body via a protruding mounting screw.
2. The puncture needle for casting with a built-in cleaning air passage function according to claim 1, characterized in that, The pointed tip is cone-shaped, with several spherical pits arranged in an equidistant array on its outer surface. A mounting screw is vertically mounted at the center of the tip's end, and the pointed tip is locked to the needle body by the mounting screw.
3. The puncture needle for casting with a built-in cleaning air passage function according to claim 1, characterized in that, The connecting end is a tapered end with an outward curve. The inner surface of the air guide cavity on the inner side of the connecting end is threaded, and the inside of the connecting end is connected to the mounting screw of the needle tip through the thread.
4. A casting puncture needle with a built-in cleaning air passage function according to claim 1, characterized in that, The spherical pits are semi-circular in shape, with a diameter of less than 2 millimeters, and are arranged in a ring from top to bottom on the pointed surface.
5. A casting puncture needle with a built-in cleaning air passage function according to claim 1, characterized in that, The air outlet is a cylindrical hole with a through-hole. One end of the air outlet is connected to the outside of the needle body, and the other end of the air outlet is connected to the inside of the air guiding cavity.