Suction paving nozzle quick connection structure for small sand mold additive manufacturing device

Abstract

The utility model relates to the technical field of sand mold additive manufacturing, in particular to a suction paving nozzle quick connecting structure for a small sand mold additive manufacturing device, which comprises a suction paving nozzle and a nozzle connecting opening which are matched with each other, and the suction paving nozzle is detachably mounted on an annular conical surface of an opening changing turntable. An annular ball groove is formed in the wall of an inner cavity of the mouthpiece opening in the circumferential direction, and a plurality of rotatable small balls are evenly embedded in the annular ball groove. And a boss surface is formed on the wall of the inner cavity above the small ball. An annular flange is arranged at the position, close to an upper end opening, of the outer wall of the suction laying nozzle in the circumferential direction. And when the suction paving nozzle and the nozzle connecting opening are in a locked joint state, the top surface of the upper end opening of the suction paving nozzle is propped against the boss surface, and the annular flange is clamped between the small ball and the boss surface. The quick connecting structure of the suction and laying nozzle can realize quick connection and separation of the suction and laying nozzle and the nozzle connecting opening, and the sealing effect is good after connection.

Description

Technical Field

[0001] This utility model relates to the field of sand mold additive manufacturing technology, specifically to a quick-connect structure for a suction nozzle in a small sand mold additive manufacturing device. Background Technology

[0002] Adaptive casting sand molds (composite sand molds) can enable the mold to adapt to the cooling and solidification process of the casting. Additive manufacturing of adaptive casting sand molds is a hot research technology in the industry.

[0003] Our company has independently developed a small-scale sand mold additive manufacturing device (CN117943514B) for adaptive casting sand molds, such as... Figure 1 As shown, this device has a fixed-point sand-spreading device, which includes an air passage box and a sand-spreading head. The sand-spreading head is installed at the lower end of the air passage box. The sand-spreading head includes a changing turntable 200 and multiple suction nozzles 1 of different sizes and / or shapes. The changing turntable 200 includes a rotatable annular conical surface 201, on which multiple suction nozzles 1 are spaced apart. The bottom of the air passage of the air passage box is provided with a connector for sealing and connecting with the suction nozzles 1. The movement of the changing turntable 200 enables quick connection between any suction nozzle 1 and the connector, thereby enabling quick changing of the fixed-point sand-spreading device. At the same time, since the area where sand needs to be replaced varies in size and shape, and there are many types of suction nozzles 1, not all of them can be installed on the annular conical surface 201. It is necessary to replace the suction nozzles 1 on the annular conical surface 201 according to the sand pattern.

[0004] Understandably, the rapid connection and reliable sealing between the suction nozzle 1 and the inlet, as well as the interchangeability between the suction nozzle 1 and the annular conical surface 300, are key technical issues in the aforementioned small sand-casting additive manufacturing device. In view of these issues, the inventors of this utility model have finally obtained this utility model after a long period of research and practice. Utility Model Content

[0005] To address at least one aspect of the aforementioned technical problems, this utility model provides a quick-connect structure for a suction nozzle in a small sand-casting additive manufacturing device.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A quick-connect structure for a suction nozzle in a small sand-casting additive manufacturing device is provided, comprising a mating suction nozzle and a connector, wherein the suction nozzle is detachably mounted on the annular conical surface of a switching turntable;

[0008] The inner wall of the connector is provided with an annular ball groove along the circumference, and a plurality of rotatable small balls are evenly embedded in the annular ball groove; a protruding surface is formed on the inner wall above the small balls;

[0009] The outer wall of the suction nozzle is provided with an annular flange along the circumferential direction near the upper port. When the suction nozzle and the connector are in a locked engagement state, the top surface of the upper port of the suction nozzle abuts against the boss surface, and the annular flange is stuck between the ball and the boss surface.

[0010] Furthermore, a first annular step and a second annular step are formed from top to bottom on the inner wall of the lower port of the nozzle; a third annular step and a fourth annular step are formed on the outer wall of the suction nozzle, which are respectively adapted to the first annular step and the second annular step; a sealing structure is provided at the joint between the first annular step and the third annular step, and a sealing structure is provided at the joint between the second annular step and the fourth annular step.

[0011] Furthermore, a sealing structure is provided at the junction of the upper port of the suction nozzle and the boss surface.

[0012] Furthermore, the quick-connect structure of the suction nozzle also includes two clamps and a locking component. The two clamps can be assembled into a ring, and the locking component has a semi-annular notch.

[0013] The outer wall of the suction nozzle is provided with an annular groove, and a semi-circular opening is formed on one side of the annular conical surface. A semi-annular groove is formed on the inner wall of the semi-circular opening. The suction nozzle is installed in the semi-circular opening, and the annular groove and the semi-annular groove are connected by the clamp. The locking member is detachably fixed to the annular conical surface, and the semi-annular notch and the annular groove are connected by the clamp.

[0014] Furthermore, the inner wall of the suction nozzle is provided with spiral air-gathering grooves.

[0015] Furthermore, a scraping blade is formed on the outer periphery of the lower port of the suction nozzle.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention's quick-connect structure for the suction nozzle allows for rapid connection and separation of the suction nozzle and the connector, while maintaining a good seal after connection. The annular conical surface facilitates easy replacement of the suction nozzle and ensures its centered positioning, resulting in precise alignment between the suction nozzle and the connector. The spiral air-gathering grooves on the inner wall of the suction nozzle create a rotating airflow, concentrating the point of action during sand suction and spreading, thus improving sand changing accuracy. The scraper at the lower end of the suction nozzle provides coarse scraping during sand changing, promoting a smooth sand surface. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the fixed-point sand-laying device of an existing small-scale sand-casting additive manufacturing apparatus is shown.

[0020] Figure 2 This diagram shows the structure of the present invention when the suction nozzle and the inlet are in a locked engagement state;

[0021] Figure 3 A schematic diagram showing the assembly state of the suction nozzle and the annular conical surface of this utility model is shown.

[0022] Figure 4 A schematic diagram of the spout structure of this utility model is shown;

[0023] Figure 5 A schematic diagram of the suction nozzle of this utility model is shown;

[0024] Figure 6 It shows Figure 5 A schematic diagram of the spiral wind-gathering channel shape from the A-direction perspective. Detailed Implementation

[0025] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] like Figures 2-5 As shown, the quick-connect structure of the suction nozzle of this utility model includes a matching suction nozzle 1 and a connecting port 2. The suction nozzle 1 is detachably mounted on the annular conical surface 201 of the switching turntable 200. An annular ball groove is provided circumferentially on the inner wall of the connecting port 2, and a plurality of rotatable small balls 21 are evenly embedded in the annular ball groove; a boss surface is formed on the inner wall above the small balls 21. An annular flange 11 is provided circumferentially on the outer wall of the suction nozzle 1 near the upper port; when the suction nozzle 1 and the connecting port 2 are in a locked engagement state, the top surface of the upper port of the suction nozzle 1 abuts against the boss surface, and the annular flange 11 is locked between the small balls 21 and the boss surface. The suction nozzle 1 is a thin-walled component, so its upper end has slight elasticity. When the suction nozzle 1 is inserted into the connector 2, the annular flange 11 is compressed inward as it passes the small ball 21, and then returns to its original position. The annular flange 11 is then secured between the boss surface and the small ball 21, thus completing the connection. Similarly, when the suction nozzle 1 is disengaged from the connector 2, the annular flange 11 is compressed inward as it passes the small ball 21, and then returns to its original position. Afterward, there is no further obstruction, allowing the suction nozzle 1 to be easily pulled out of the connector 2. Preferably, the upper and lower parts of the annular flange 11 are respectively formed with inclined guide surfaces, allowing the annular flange 11 to pass smoothly through the small ball 21, enabling rapid connection and separation of the suction nozzle 1 and the connector 2. A sealing ring 15 is provided on the top surface of the upper end of the suction nozzle 1 to seal the gap between the top surface of the upper end of the suction nozzle 1 and the boss surface.

[0030] The inner wall of the lower end of the nozzle 2 has a first annular step 23 and a second annular step 24 formed from top to bottom. The outer wall of the suction nozzle 1 has a third annular step 16 and a fourth annular step 17, respectively adapted to the first annular step 23 and the second annular step 24. A sealing ring is provided at the junction of the side walls of the first annular step 23 and the third annular step 16, and a sealing ring is provided at the junction of the second annular step 24 and the top wall of the fourth annular step 17. A sealing ring 14 is provided on the side wall of the fourth annular step 17 to seal the junction of the side walls of the second annular step 24 and the fourth annular step 17. An inner concave surface 22 is formed on the inner wall of the nozzle 2 below the ball 21. The area between the inner concave surface 22 and the first annular step 23 is sealed by two sealing rings 12 and 13 on the outer wall of the suction nozzle 1. The sealing ring 12 is tightly attached to the lower edge of the inner concave surface 22. This sealing structure ensures the sealing performance between the suction nozzle 1 and the nozzle 2.

[0031] The quick-connect structure of the suction nozzle also includes two clamps 4 and a locking element 3. The two clamps 4 can be assembled into a ring, and the locking element 3 has a semi-annular notch 31. The outer wall of the suction nozzle 1 has an annular groove 19, and one side of the annular conical surface 201 has a semi-circular opening. The inner wall of the semi-circular opening has a semi-annular groove 2011. The suction nozzle 1 is installed inside the semi-circular opening, and the annular groove 19 and the semi-annular groove 2011 are connected by the clamps 4. The locking element 3 is detachably fixed to the annular conical surface, and the semi-annular notch 31 and the annular groove 19 are connected by the clamps 4. Understandably, when the suction nozzle 1 is installed on the annular conical surface 201, a clamp 4 is first installed in the annular groove 19. The suction nozzle 1 is then inserted into the semi-circular opening, with the portion of the clamp 4 protruding from the outer wall of the suction nozzle 1 extending into the semi-annular groove 2011. Another clamp 4 is then installed in the remaining space of the annular groove 19. The semi-annular notch 31 of the locking member 3 is then inserted into the clamp 4. Finally, the locking member 3 is fixed to the annular conical surface 201. For example, the locking member 3 and the annular conical surface 201 can be connected by bolts. Understandably, through the above structure and steps, the suction nozzle can be easily replaced on the annular conical surface. Furthermore, the annular clamp 4, the locking member 3, and the semi-circular opening structure ensure the centered positioning of the suction nozzle, guaranteeing that the axes are collinear and the connection is precise when the suction nozzle 1 is inserted into the connector 2.

[0032] In a preferred embodiment, a scraper blade 18 is formed on the outer periphery of the lower port of the suction nozzle 1. The fixed-point suction and sand-laying device is used to remove debris from a preset area and then re-lay sand within the preset area. When removing debris, the scraper blade 18 adheres to the sand surface, facilitating precise removal of debris from the preset area. When laying sand, the scraper blade 18 can smooth the newly laid sand surface, making the entire printed layer smoother and improving print quality.

[0033] like Figure 6 , Figure 2 As shown, in a preferred embodiment, a spiral air-gathering groove S is provided on the inner wall of the suction nozzle 1. Because higher precision is required for sand changing, and to make the action point of the fixed-point suction and sand-laying device more concentrated during sand suction and laying, a spiral air-gathering groove S is formed on the inner wall of the suction nozzle 1, which creates a rotating airflow within it. Figure 2 The airflow arrows in the image indicate the sand suction state, which is more beneficial for sand suction and spreading.

[0034] The above are merely preferred embodiments of this utility model and are illustrative rather than restrictive. The structure and connection methods of the components in this utility model can be varied. Any equivalent transformations and improvements made based on the technical solution of this utility model should not be excluded from the protection scope of this utility model.

Claims

1. A quick connection structure of suction nozzle for small sand mold additive manufacturing device, comprising a matching suction nozzle and a nozzle port, the suction nozzle is detachably mounted on the annular taper surface of the nozzle changing rotary table; characterized in that, an annular ball groove is arranged on the inner cavity wall of the nozzle port in the circumferential direction, a plurality of rotatable small balls are uniformly embedded in the annular ball groove; a boss surface is formed on the inner cavity wall above the small balls; an annular flange is arranged on the outer wall of the suction nozzle near the upper port in the circumferential direction; when the suction nozzle and the nozzle port are in a locked engagement state, the upper port top surface of the suction nozzle abuts against the boss surface, and the annular flange is clamped between the small balls and the boss surface.

2. A suction nozzle quick connection structure for a small-sized sand mold additive manufacturing apparatus according to claim 1, characterized in that, a first annular step and a second annular step are formed on the inner cavity wall of the lower port part of the nozzle port from top to bottom; a third annular step and a fourth annular step are formed on the outer wall of the suction nozzle, which are adapted to the first annular step and the second annular step respectively; a sealing structure is arranged at the joint of the first annular step and the third annular step, and a sealing structure is arranged at the joint of the second annular step and the fourth annular step.

3. A suction nozzle quick connection structure for a small-sized sand mold additive manufacturing apparatus according to claim 2, characterized in that, a sealing structure is arranged at the joint of the upper port of the suction nozzle and the boss surface.

4. The suction nozzle quick connection structure for a small-sized sand mold additive manufacturing apparatus according to claim 1, characterized in that, two clamps and a locking member are further included, the two clamps can be combined into an annular member, a semicircular notch is formed on the locking member; an annular groove is arranged on the outer wall of the suction nozzle, a semicircular opening is formed on one side of the annular taper surface, a semicircular groove is formed on the inner wall of the semicircular opening; the suction nozzle is installed in the semicircular opening, the annular groove and the semicircular groove are connected through the clamps; the locking member is detachably fixedly connected with the annular taper surface, the semicircular notch and the annular groove are connected through the clamps.

5. A small-sized sand mold additive manufacturing device suction-laying nozzle quick connection structure according to claim 1, characterized in that, a spiral wind gathering groove line is arranged on the inner cavity wall of the suction nozzle.

6. A small-sized sand mold additive manufacturing device suction-laying nozzle quick connection structure according to claim 1, characterized in that, a sand scraping piece is formed on the outer periphery of the lower port of the suction nozzle.

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