Precise positioning pin

Abstract

The utility model discloses a precise positioning pin, and relates to the technical field of fastening devices, in particular to a precise positioning pin which comprises a fixing sleeve, an expansion sleeve, a bolt and a screw rod, a sliding groove is formed in the fixing sleeve along a middle shaft, and an annular groove is formed in the side wall of one end of the fixing sleeve; wherein by screwing the bolt, the bolt drives the screw rod to rotate, the screw rod pushes the expansion sleeve in threaded connection with the screw rod to slide on the fixing sleeve, the expansion sleeve moves towards the interior of the fixing sleeve, and the expansion sleeve retracts towards the side where the fixing sleeve is located; the exposed end of the expansion sleeve is pushed by the screw rod to reset, and the boss on the exposed end of the expansion sleeve expands outwards; the expansion sleeve continuously retracts into the fixing sleeve, and when the expansion sleeve slides towards the interior of the fixing sleeve, the protruding table at the exposed end of the expansion sleeve pulls the multi-layer material, so that the multi-layer material is tensioned and tightly attached, extension and tearing of the multi-layer material in subsequent operation are avoided, and effective riveting of the multi-layer material is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fastening devices, in particular to a precise positioning pin. Background Art

[0002] During the riveting process of composite materials, it is necessary to overcome the elongation problem caused by different materials, so pre-tensioning is required before riveting. This is where locating pins are used. The locating pins pass through the prefabricated holes, are locked with an appropriate force, and fixed to the riveted surface. The uniform distribution and uniform tensioning force enable the elongation of the material before riveting to be well controlled. Traditional wedge-shaped locating pins have disadvantages: they must be easy to pass through the prefabricated holes, and lock the end face after tightening. Moreover, this is achieved by inserting a wedge-shaped core. This causes the locking position of the head and the expansion of the shaft to occur simultaneously, and the expansion size is exactly the same (the thickness of the wedge-shaped core). The end face is locked only by the elastic deformation of the core shaft itself, which has poor stability. In the later riveting process, it is easy to loosen, causing the material to exceed the elongation standard after riveting, resulting in scrap.

[0003] In the published Chinese patent application, publication number: CN205043662U, patent name: New quick-release positioning fastener, this prior art selects a chuck with 4 petals, 6 petals, 8 petals or more petals according to the characteristics of the plate to be fixed. By increasing the number of chuck petals, the strength of the quick-release positioning fastener can be improved, the preload force is effectively dispersed, and the plate to be fixed is prevented from being damaged by the preload force generated by the quick-release positioning fastener. Different chuck diameters and numbers of petals use different installation torques when assembled on different plates to be fixed. After being subjected to a high preload, chucks with 4 petals, 6 petals, 8 petals or more petals are evenly stressed, have good stability, and are not easily deformed. Although this prior art can solve the above-mentioned problems, it still has certain limitations in its specific implementation.

[0004] In the specific implementation of this prior art, the nut is screwed to drive the threaded rod connected to it to move. The displacement of the threaded rod pushes the support plate to move. The support plate moves and squeezes the claws, causing the claws to expand outward, thereby making the outer diameter of the boss larger than the inner diameter of the fixing hole, thus achieving riveting. However, this prior art does not limit the nut. The nut is in a free state. When the nut rotates in this free state, it moves axially along the threaded rod and cannot effectively drive the threaded rod to rotate. As a result, the threaded rod cannot push the support plate to move, making this prior art unable to achieve effective riveting of composite materials. Utility Model Content

[0005] (1) Technical problems solved

[0006] In view of the deficiencies in the prior art, the present invention provides a precise positioning pin, which solves the problems raised in the above-mentioned background technology.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a precise positioning pin, including a fixing sleeve, an expansion sleeve, a bolt, and a screw, a sliding groove is provided inside the fixing sleeve along the central axis, and an annular groove is provided on the side wall of one end of the fixing sleeve; the expansion sleeve is inserted into the sliding groove of the fixing sleeve, and the expansion sleeve is slidably connected to the fixing sleeve, and the expansion sleeve is moved out or moved into the fixing sleeve by sliding; the expansion sleeve is cylindrical as a whole, the screw passes through the expansion sleeve, and the outer wall of the screw is threadedly connected to the inner wall of the expansion sleeve; one end of the bolt is inserted into the annular groove of the fixing sleeve, and the bolt is rotatably connected to the fixing sleeve, and one end of the screw is fixedly installed with the bolt; when the bolt rotates, it drives the screw to rotate, and when the screw rotates, it pushes the expansion sleeve threadedly connected to it to slide on the fixing sleeve.

[0009] Optionally, an outer side wall of one end of the fixing sleeve is in the shape of a hexagonal prism.

[0010] Optionally, the expansion sleeve consists of a cylindrical portion and a sliding portion, one end of the cylindrical portion is fixedly connected to the sliding portion, a plurality of strip grooves are axially opened on the other end wall of the cylindrical portion, and a raised platform is fixedly connected to the outer side wall of the end of the cylindrical portion.

[0011] Optionally, the sliding groove inside the fixing sleeve is a hexagonal cavity, the sliding tube portion of the expansion sleeve is in the shape of a hexagonal nut, the sliding tube portion is located in the sliding groove of the fixing sleeve, and the sliding tube portion is slidably connected to the fixing sleeve.

[0012] (3) Beneficial effects

[0013] The utility model provides a precise positioning pin, which has the following beneficial effects:

[0014] The precise positioning pin has the effect of tightening and fixing the composite material through the coordinated arrangement of the fixing sleeve, the expansion sleeve, the bolt and the screw, wherein the exposed end of the expansion sleeve (the end where the strip groove is located) is pressed to shrink the exposed end of the expansion sleeve, and the shrunken exposed end of the expansion sleeve is inserted into the prefabricated hole opened on the composite material, and the bolt is screwed. The bolt drives the screw to rotate, and the screw pushes the expansion sleeve threadedly connected thereto to slide on the fixing sleeve, and the expansion sleeve moves toward the inside of the fixing sleeve, and the expansion sleeve is retracted toward the side where the fixing sleeve is located; the screw pushes the exposed end of the expansion sleeve to reset, and the raised platform on the exposed end of the expansion sleeve expands outward; the expansion sleeve continues to retract the fixing sleeve, and when the expansion sleeve slides toward the inside of the fixing sleeve, the raised platform at the exposed end of the expansion sleeve pulls the composite material, thereby tightening the composite material and making the composite material close to each other, thereby preventing the composite material from extending or tearing in subsequent operations, thereby achieving effective riveting of the composite material. 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the precise positioning pin of the utility model (the expansion sleeve is in the extended state);

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the precise positioning pin of the utility model (the expansion sleeve is in a retracted state);

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the fixing sleeve in the precise positioning pin of the utility model;

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the expansion sleeve in the precise positioning pin of the utility model;

[0020] Figure 5 for Figure 4 A in the middle is an enlarged structural diagram;

[0021] Figure 6 Schematic diagram of the use process of the precision positioning pin of the utility model, wherein a is a schematic diagram of the cross-sectional structure of the expansion sleeve of the utility model when penetrating the composite material; b is a schematic diagram of the cross-sectional structure of the expansion sleeve of the utility model after penetrating the composite material; c is a schematic diagram of the cross-sectional structure of the utility model when tightening and fixing the composite material;

[0022] Figure 7 for Figure 6 Enlarged structural diagram at point B in the middle.

[0023] In the figure: 1. fixing sleeve; 101. hexagonal prism portion; 102. annular groove; 103. slide groove; 2. expansion sleeve; 201. strip groove; 202. raised platform; 203. slide tube portion; 204. cylinder portion; 3. bolt; 4. screw; 5. material A; 6. material B. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indications or implications.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances. Obviously, the embodiments described are only some of the embodiments of this utility model, and not all of them.

[0026] See also Figures 1 to 6 The present invention provides a technical solution: The precise positioning pins shown in this technical solution are used to fasten composite materials, strengthen the coupling properties of the composite materials, and ensure that the composite materials adhere closely to each other. Composite materials refer to multi-layer material structures composed of at least two layers of materials. In this solution, the composite material is taken as an example of two layers of materials, wherein material A5 and material B6 constitute the composite material, and both materials A5 and B6 are provided with prefabricated holes, and the prefabricated holes in materials A5 and B6 correspond to each other.

[0027] The precise positioning pin includes a fixed sleeve 1, an expansion sleeve 2, a bolt 3, and a screw rod 4. A sliding groove 103 is provided inside the fixed sleeve 1 along the central axis, and an annular groove 102 is provided on the side wall of one end of the fixed sleeve 1. The expansion sleeve 2 is inserted into the sliding groove 103 of the fixed sleeve 1, and the expansion sleeve 2 is slidably connected to the fixed sleeve 1. The expansion sleeve 2 is moved out of or into the fixed sleeve 1 by sliding. The expansion sleeve 2 is cylindrical in shape as a whole, and the screw rod 4 passes through the expansion sleeve 2, and the outer wall of the screw rod 4 is threadedly connected to the inner wall of the expansion sleeve 2. One end of the bolt 3 is inserted into the annular groove 102 of the fixed sleeve 1, and the bolt 3 is rotatably connected to the fixed sleeve 1, and one end of the screw rod 4 is fixedly installed to the bolt 3. When the bolt 3 rotates, it drives the screw rod 4 to rotate. When the screw 4 rotates, it pushes the expansion sleeve 2 threadedly connected to it to slide on the fixed sleeve 1. The expansion sleeve 2 consists of a cylindrical portion 204 and a sliding portion 203. One end of the cylindrical portion 204 is fixedly connected to the sliding portion 203. A plurality of strip grooves 201 are axially opened on the other end wall of the cylindrical portion 204, and a raised platform 202 is fixedly connected to the outer side wall of the end of the cylindrical portion 204.

[0028] The exposed end of the expansion sleeve 2 (where the strip grooves 201 are located) is provided with a plurality of strip grooves 201, so that the exposed end of the expansion sleeve 2 is in the shape of a plurality of claws. Pressing the exposed end of the expansion sleeve 2 causes the claws of the exposed end of the expansion sleeve 2 to contract, and the claws are close to the central axis, so that the raised platforms 202 are close to the central axis (see the attached diagram). Figure 6 In step a), at this time, the outermost edge diameter of the raised platform 202 is less than or equal to the diameter of the prefabricated hole on the composite material. Thereafter, the contracted exposed end of the expansion sleeve 2 is inserted into the prefabricated hole opened in the composite material (material A5, material B6), and the bolt 3 is screwed. The bolt 3 drives the screw 4 to rotate, and the screw 4 pushes the expansion sleeve 2 threadedly connected thereto to slide on the fixed sleeve 1. The expansion sleeve 2 moves toward the inside of the fixed sleeve 1 and the expansion sleeve 2 retracts toward the side where the fixed sleeve 1 is located. The screw 4 pushes the exposed end of the expansion sleeve 2 to reset, that is, each flap claw is no longer in a contracted state (refer to the attached Figure 6 Step b), the raised platform 202 on the exposed end of the expansion sleeve 2 expands outward. The expansion sleeve 2 continues to retract into the fixed sleeve 1. When the expansion sleeve 2 slides into the fixed sleeve 1, the inner edge of the raised platform 202 creates a limit block for the material B6. The raised platform 202 on the exposed end of the expansion sleeve 2 pulls the composite material, thereby pulling the composite material closer and tightly (see attached Figure 6 In step c), material A5 and material B6 are in close contact, which prevents the composite material from stretching or tearing in subsequent operations, thereby achieving effective riveting of the composite material.

[0029] Please refer to Figure 7, the claw end of the expansion sleeve 2 (the end where the raised platform 202 is located) is oval (including but not limited to curved surface), making the claw end fuller. The claw end and edges are polished and other treatments to make them smoother, without burrs or sharp corners, so that the claw end can slide more smoothly when entering and exiting the prefabricated hole without damage; the expansion is more firm and there is no damage to the exit edge of the prefabricated hole. The prior art has a pointed-edge structure for the expansion head for plane tightening, which will cause damage to the hole wall when entering and exiting the hole, reducing the product yield. Therefore, compared with the prior art, this technical solution can effectively avoid damage to the hole wall of the composite material.

[0030] Specifically, the outer wall of one end of the fixing sleeve 1 is in the shape of a hexagonal column.

[0031] Among them, reference Figure 3 The fixing sleeve 1 includes a hexagonal column portion 101, and the outer wall of the hexagonal column portion 101 is in the shape of a hexagonal column or a hexagonal nut, which is convenient for clamping and fixing with pliers.

[0032] Specifically, the sliding groove 103 inside the fixing sleeve 1 is a hexagonal cavity, and the sliding cylinder portion 203 of the expansion sleeve 2 is in the shape of a hexagonal nut. The sliding cylinder portion 203 is located in the sliding groove 103 of the fixing sleeve 1, and the sliding cylinder portion 203 is slidably connected to the fixing sleeve 1.

[0033] Among them, the sliding groove 103 inside the fixed sleeve 1 is a hexagonal cavity, and the sliding cylinder portion 203 is slidably arranged in the sliding groove 103 of the fixed sleeve 1. The sliding cylinder portion 203 can slide axially in the sliding groove 103 of the fixed sleeve 1, that is, the expansion sleeve 2 slides axially in the sliding groove 103 of the fixed sleeve 1.

[0034] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Precision positioning pin, characterized by: It comprises a fixing sleeve (1), an expansion sleeve (2), a bolt (3), and a screw rod (4); a sliding groove (103) is provided inside the fixing sleeve (1) along the central axis; and an annular groove (102) is provided on a side wall at one end of the fixing sleeve (1); The expansion sleeve (2) is inserted into the sliding groove (103) of the fixed sleeve (1), and the expansion sleeve (2) is slidably connected to the fixed sleeve (1), and the expansion sleeve (2) is moved out of or into the interior of the fixed sleeve (1) by sliding; The expansion sleeve (2) is cylindrical in shape as a whole, the screw rod (4) passes through the expansion sleeve (2), and the outer wall of the screw rod (4) is threadedly connected to the inner wall of the expansion sleeve (2); One end of the bolt (3) is inserted into the annular groove (102) of the fixing sleeve (1), and the bolt (3) is rotatably connected to the fixing sleeve (1), and one end of the screw rod (4) is fixedly installed with the bolt (3); When the bolt (3) rotates, the screw rod (4) is driven to rotate, and when the screw rod (4) rotates, the expansion sleeve (2) threadedly connected thereto is pushed to slide on the fixing sleeve (1).

2. The precise positioning pin according to claim 1, characterized in that: The outer side wall of one end of the fixing sleeve (1) is in the shape of a hexagonal prism.

3. The precise positioning pin according to claim 1, characterized in that: The expansion sleeve (2) is composed of a cylindrical portion (204) and a sliding portion (203), one end of the cylindrical portion (204) is fixedly connected to the sliding portion (203), a plurality of strip grooves (201) are axially provided on the other end wall of the cylindrical portion (204), and a protruding platform (202) is fixedly connected to the outer side wall of the end of the cylindrical portion (204).

4. The precise positioning pin according to claim 3, characterized in that: The sliding groove (103) inside the fixed sleeve (1) is a hexagonal prism-shaped cavity, the sliding tube portion (203) of the expansion sleeve (2) is in the shape of a hexagonal nut, the sliding tube portion (203) is located in the sliding groove (103) of the fixed sleeve (1), and the sliding tube portion (203) is slidably connected to the fixed sleeve (1).

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