Rapid and accurate positioning device for empennage and main core rod

Abstract

The utility model discloses a device for quickly and accurately positioning an empennage and a main core rod. The device comprises four empennage panels and the main core rod, wherein the main core rod is of a cylindrical structure, one end of the main core rod is provided with a flanging structure, and the flanging structure is symmetrically provided with a first through hole and a positioning pin; the empennage panel is of an L-shaped structure, and a notch groove and a second through hole are formed in one side of the L-shaped structure; the two empennage panels are in mirror connection, and the two notch grooves are spliced to form a positioning groove; the positioning groove is matched with the positioning pin; the four empennage fins penetrate through the first through holes and the second through holes through fixing pieces to be symmetrically connected with the main core rod. The device is high in positioning precision, and accurate positioning of the main core rod and the empennage panel is ensured.

Description

Technical Field

[0001] This utility model relates to a rapid and precise positioning device for tail fins and main mandrels, belonging to the field of solid rocket engine combustion chamber core mold assembly technology. Background Technology

[0002] Currently, the entire production process of a solid rocket motor combustion chamber includes raw material weighing, mixing, casting, vulcanization, demolding, and shaping. Among these, the casting process is irreversible; any problem during casting will result in irreversible consequences. The smooth progress of the casting process depends first and foremost on ensuring the correct and reliable assembly of the core mold. Therefore, the core mold assembly step is a crucial step in the casting process. The core mold assembly step involves assembling the prepared core mold sequentially inside the insulating shell according to the assembly sequence specified in the core mold instruction manual. The core mold also includes various structures, including integral core molds and modular core molds. Integral core molds are simpler in structure; assembly simply involves hoisting the core mold into the insulation shell. Modular core molds, however, require the assembly of the head fin, tail fin, and main mandrel within the shell. The docking method between the tail fin and the main mandrel is the most challenging aspect of the assembly process. After the main mandrel is assembled, personnel must lift each tail fin individually and align it with the screw holes on the main mandrel before connecting it with bolts. This docking process relies entirely on visual inspection. If the visual deviation is significant, multiple adjustments and hoistings of the main mandrel are required to meet the docking requirements. This process is heavily influenced by human factors, resulting in low production efficiency and hindering smooth production. Conversely, even with minor deviations, assembly may still occur, but without perfect docking. This could cause the tail fin to become stuck, potentially leading to abnormal drug form during slurry pouring and subsequent high-temperature curing, thus affecting product quality. Therefore, in order to ensure accurate and rapid positioning of the combustion chamber tail fin and main mandrel, simplify personnel operations, and reduce potential quality risks, a rapid positioning auxiliary device was designed for use in the assembly process of the combustion chamber main mandrel and tail fin.

[0003] A search revealed that the patent application number CN202320470455.4, entitled "A Positioning Fixture," has a docking method largely the same as that of this utility model. However, docking using a vertical positioning method can lead to inaccuracies due to deviations in individual positioning positions. Utility Model Content

[0004] The technical problem solved by this utility model is to overcome the shortcomings of the prior art and provide a rapid and accurate positioning device for the tail fin and the main core rod, so as to ensure the accurate positioning of the main core rod and the tail fin blade.

[0005] The technical solution of this utility model is:

[0006] This utility model discloses a rapid and precise positioning device for a tail fin and a main core rod, comprising: four tail fin blades and a main core rod; wherein...

[0007] The main core rod is a cylindrical structure with a flanged structure at one end. The flanged structure is symmetrically provided with a first through hole and a positioning pin.

[0008] The tail fin has an L-shaped structure, with a notch and a second through hole on one side.

[0009] The two tail fins are mirror-connected, and the two notches are joined together to form a positioning groove; the positioning groove matches the positioning pin.

[0010] The four tail fins are symmetrically connected to the main core rod by passing through the first and second through holes with fixing components.

[0011] Furthermore, in the above-mentioned device, during operation, the tail wing is installed on the positioning plate and fixed; the notches of the two tail wings are spliced ​​together to form the positioning groove of the tail wing; the main mandrel is lowered, and according to the position of the positioning pin of the main mandrel and the positioning groove of the tail wing, the main mandrel and the tail wing are docked; the tail wing is lifted, and bolts are used to connect the second through hole of the tail wing with the first through hole of the main mandrel to realize the docking of the tail wing and the main mandrel.

[0012] Furthermore, in the above-described device, the positioning pin is conical in shape.

[0013] Furthermore, in the aforementioned device, the positioning pin and the main core rod are an integral structure.

[0014] The advantages of this utility model over the prior art are as follows:

[0015] (1) This utility model effectively improves the efficiency of docking the combustion chamber tail fin and the main core rod. At the same time, the use of this device improves the accuracy of docking, reduces the workload of personnel, and avoids the hidden dangers of personnel reworking multiple times and the extra material caused by the rework process.

[0016] (2) This utility model effectively reduces the number of reworks caused by assembly deviations due to inaccurate visual inspection by personnel, as well as the quality problems of abnormal drug form caused by operational deviations. This embodiment is easy to operate and has accurate positioning, and can effectively improve the efficiency of core mold assembly and reduce the labor intensity of operators.

[0017] (3) This utility model adopts a combined positioning groove structure for positioning, avoiding the phenomenon of inaccurate docking caused by the deviation of a single positioning position; in addition, this device uses a conical pin for positioning, which has better positioning accuracy and load-bearing capacity, and higher positioning accuracy, ensuring that the main core rod and the tail wing are accurately positioned.

[0018] (4) This utility model can reduce the quality risks in the assembly process. If the assembly is not done properly in one go, the main mandrel needs to be lifted, rotated at a certain angle and then reassembled. This process may cause secondary contamination of the interface by the main mandrel.

[0019] (5) This utility model adopts tapered pin positioning technology, which realizes rapid and accurate positioning technology, and solves the problems of low positioning efficiency, high rework risk, foreign matter hazards and quality hazards caused by inaccurate positioning during the assembly process of tail fin and mandrel. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the tail fin of this utility model;

[0021] Figure 2 This is a schematic diagram of the main core rod of this utility model;

[0022] Figure 3 This is a schematic diagram illustrating the specific implementation effect of this utility model.

[0023] 1 Main mandrel; 2 Main mandrel positioning pin; 3 Tail wing blade; 4 Tail wing blade notch groove; 5 Tail wing blade positioning groove; 6 Bolt connection. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 and Figure 2 As shown, this utility model discloses a rapid and precise positioning device for a tail fin and a main mandrel, comprising: four tail fin blades 3 and a main mandrel 1; wherein,

[0026] like Figure 2 As shown, the main core rod 1 is a cylindrical structure with a flange structure at one end. The flange structure is symmetrically provided with a first through hole 6 and a positioning pin 2.

[0027] like Figure 3 As shown, the tail fin 3 has an L-shaped structure, with a notch 4 and a second through hole 6' on one side of the L-shaped structure;

[0028] like Figure 3 As shown, the two tail fins 3 are mirror-connected, and the two notches 4 are spliced ​​together to form a positioning groove 5; the positioning groove 5 matches the positioning pin 2.

[0029] The four tail fins 3 are symmetrically connected to the main core rod 1 by passing through the first through hole 6 and the second through hole 6' via fasteners.

[0030] Preferably, during operation, the tail wing 3 is installed on the positioning plate and fixed; the notches 4 of the two tail wing 3 are spliced ​​together to form the positioning groove 5 of the tail wing 3; the main mandrel 1 is lowered, and the main mandrel 1 and the tail wing 3 are docked according to the position of the main mandrel positioning pin 2 and the tail wing wing positioning groove 5; the tail wing 3 is lifted, and the second through hole 6' of the tail wing 3 is connected to the first through hole 6 of the main mandrel 1 with bolts to realize the docking of the tail wing 3 and the main mandrel 1.

[0031] Preferably, the locating pin 2 is conical in shape, which can provide precise guidance.

[0032] Preferably, the positioning pin 2 and the main core rod 1 are an integral structure.

[0033] The locating pins 2 are symmetrically distributed, which increases the positioning accuracy.

[0034] In this embodiment, the tail fin blades 3 are first installed one by one according to the assembly sequence. After the tail fin blades are installed, they can be assembled into a circle with a circular channel in the middle. After assembling the circle, the main mandrel 1 is lifted by a crane to directly above the assembled tail fin circle. After ensuring that the main mandrel 1 is located in the center of the assembled tail fin circle, the main mandrel 1 is lowered. During the descent, it is confirmed that the serial number of the main mandrel 1 corresponds to the serial number of the tail fin blade 3. During the descent, the position of the main mandrel positioning pin 2 and the positioning groove 5 are observed. Once the main mandrel positioning pin is inserted into the positioning groove, the entire docking process is completed. Subsequently, the tail fin blades 3 are lifted in sequence and connected to the main mandrel 1 using bolts. The entire positioning device is made of steel and is fixed using bolts.

[0035] This embodiment effectively reduces rework caused by assembly deviations due to inaccurate visual inspection, as well as quality problems such as abnormal drug formulations caused by operator errors. This embodiment is easy to operate, provides accurate positioning, and effectively improves the efficiency of core mold assembly while reducing the labor intensity of operators.

[0036] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

[0037] The contents not described in detail in this utility model specification are common knowledge to those skilled in the art.

Claims

1. A tail wing and main mandrel fast and accurate positioning device, characterized in that, The utility model relates to a kind of tail wing wing piece and main mandrel, comprising: Four tail wing wing pieces (3) and main mandrel (1);Wherein, The main mandrel (1) is cylindrical structure, and one end is provided with flanging structure, and flanging structure is provided with first through-hole (6) and positioning pin (2) symmetrically; Tail wing wing piece (3) is L-shaped structure, and one side of L-shaped structure is provided with notch slot (4) and second through-hole (6'); Two tail wing wing pieces (3) are connected mirror, and two notch slots (4) are spliced to form positioning slot (5);Positioning slot (5) is matched with positioning pin (2); Four tail wing wing pieces (3) are respectively connected with main mandrel (1) by fixed piece through first through-hole (6) and second through-hole (6').

2. The tail wing and main mandrel fast and accurate positioning device according to claim 1, characterized in that: When working, tail wing wing piece (3) is installed on positioning disc and fixed;The notch slot (4) of two tail wing wing pieces (3) is spliced to form the positioning slot (5) of tail wing wing piece;Main mandrel (1) falls, and according to the position of main mandrel positioning pin (2) and tail wing wing piece positioning slot (5), the butt joint of main mandrel (1) and tail wing wing piece (3) is completed;Tail wing wing piece (3) is lifted, and the second through-hole (6') of tail wing wing piece (3) is connected with the first through-hole (6) of main mandrel (1) using bolt, to realize the butt joint of tail wing wing piece (3) and main mandrel (1).

3. The tail wing and main mandrel fast and accurate positioning device according to claim 1, characterized in that: The positioning pin (2) is conical shape.

4. The tail wing and main mandrel fast and accurate positioning device according to claim 1, characterized in that: Positioning pin (2) and main mandrel (1) are integrated structure.

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