A small length-diameter ratio thread rotary body mechanism assembling tool

Abstract

The application discloses a small-length-diameter-ratio threaded rotary body mechanism assembling tool, which comprises a fixed disc, a double-end stud, a positioning disc, a gland and a nut arranged in sequence from bottom to top above the fixed disc; one end of the double-end stud is in threaded connection with the fixed disc, and the other end is in threaded connection with the nut through a positioning disc and a gland and an outer threaded connecting piece at the bottom of a mechanism to be assembled; the bottom of the positioning disc is connected with the outer threaded connecting piece at the top of the mechanism to be assembled through a positioning pin. The positioning disc and the outer threaded connecting piece of the mechanism to be assembled are matched to guide and position, which can effectively solve the problems of low hole accuracy and low mechanism assembling efficiency, and the auxiliary tightening of the inner and outer threaded connecting pieces of the small-length-diameter-ratio threaded rotary body mechanism is realized through the fixation of the whole assembling tool and the mechanism to be assembled, so that the surface quality of the mechanism is avoided from being damaged in the whole assembling process; and the assembling tool is suitable for various styles of small-length-diameter-ratio threaded rotary body mechanisms.

Description

Technical Field

[0001] This invention belongs to the field of mechanical assembly technology, and more specifically, relates to an assembly tool for a small length-to-diameter ratio threaded rotary body mechanism. Background Technology

[0002] In mechanical products, there is a type of mechanism with a small length-to-diameter ratio and a threaded connection between rotating parts. Due to the limitations of the operating environment, the external threaded connector lacks a tightening drive position. Currently, the assembly of such mechanisms typically involves fixing the external threaded connector and driving the internal threaded connector to tighten, or manually tightening slowly with visual inspection. These assembly methods cannot achieve the assembly of mechanisms under certain extreme operating conditions. Even if they can be operated, they often result in difficulty in ensuring coaxiality, low assembly efficiency, and damage to the outer surface of the mechanism. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned shortcomings and provide an assembly tool for a small aspect ratio threaded rotary mechanism to achieve rapid and efficient assembly of rotary joints with threaded fittings. This tool effectively solves the problems of low hole accuracy and low assembly efficiency in mechanism assembly, enabling rapid assembly of small aspect ratio threaded rotary mechanisms, improving assembly accuracy, and reducing component damage.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: This invention provides an assembly tool for a small aspect ratio threaded rotary body mechanism, including a fixed plate, and a double-ended stud, a positioning plate, a pressure cap and a nut arranged sequentially from bottom to top on the fixed plate; One end of the double-ended stud is threaded to the fixed plate, and the other end passes through the internal threaded connector, positioning plate and pressure cap at the bottom of the mechanism to be assembled and is threaded to the nut. The bottom of the positioning plate is connected to the top of the assembly mechanism via a locating pin.

[0005] Furthermore, the upper surface of the fixed plate is a planar structure with threaded holes, and the lower surface is a boss structure.

[0006] Furthermore, the positioning plate includes a positioning plate and a tightening nut, with the positioning plate positioned below and the tightening nut positioned centrally above.

[0007] Furthermore, the bottom of the pressure cap is provided with a positioning groove that cooperates with the positioning plate, and a through hole is provided above the positioning groove.

[0008] Furthermore, the diameter c of the positioning groove and the diameter d of the positioning plate satisfy the relationship 0 < cd ≤ 2 mm; the height a of the positioning groove and the height b of the positioning plate satisfy the relationship 0 < ab ≤ 1 mm.

[0009] Furthermore, the inner diameter of the tightening nut is larger than the diameter of the guide rod above the internal component of the mechanism to be assembled, so that the guide rod can freely pass through the inner diameter of the tightening nut.

[0010] Furthermore, the positioning plate is a hollow inner boss structure, and the inner boss of the positioning plate cooperates with the outer boss on the top of the external threaded connector. The diameter e of the inner boss of the positioning plate and the diameter f of the outer boss of the external threaded connector satisfy the relationship that 2mm≤ef≤5mm.

[0011] Furthermore, the two ends of the positioning pin are respectively connected to the positioning pin holes on the positioning plate and the external threaded connector. The positioning pin and the positioning pin hole are in a transition fit relationship, and the hole diameter fit clearance is △φ (-0.015mm, +0.016mm).

[0012] Furthermore, four nuts are provided, evenly distributed above the pressure cap along the circumference of the pressure cap, and the double-ended studs are correspondingly provided with the nuts.

[0013] Furthermore, there are two positioning pins, which are evenly distributed along the circumference of the positioning disc and do not interfere with the double-ended studs.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The assembly tool for a small aspect ratio threaded rotary body mechanism provided by the present invention guides and positions the mechanism by cooperating with the external threaded connector of the mechanism to be assembled through a positioning plate. This can effectively solve the problems of low hole accuracy and low assembly efficiency in mechanism assembly. Furthermore, by fixing the assembly tool as a whole with the mechanism to be assembled, the internal and external threaded connectors of the small aspect ratio threaded rotary body mechanism are tightened, thus avoiding damage to the surface quality of the mechanism during the entire assembly process. Specifically, the outer boss on the upper part of the external threaded connector is used to cooperate with the inner boss of the positioning plate as a guide and limit, and the positioning pin hole on the external threaded connector is used to position the mechanism, so as to realize the precise centering and rapid assembly of the mechanism. Existing mechanical products contain various styles of small length-to-diameter ratio threaded rotary mechanisms, but they all include external threaded connectors and internal threaded connectors. Therefore, the assembly tool described in this invention is applicable to various styles of small length-to-diameter ratio threaded rotary mechanisms, and is especially suitable for various types of small-batch products. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the assembly mechanism described in this invention; Figure 2 A schematic diagram of the structure of an assembly tool for a small aspect ratio threaded rotary body mechanism provided in an embodiment of the present invention; Figure 3This is a partial cross-section of the assembly tool for the small aspect ratio threaded rotary body mechanism described in the embodiment. Figure 1 ; Figure 4 This is a partial cross-section of the assembly tool for the small aspect ratio threaded rotary body mechanism described in the embodiment. Figure 2 ; Figure 5 Cross-section of the positioning disk described in the embodiment Figure 1 ; Figure 6 The cross-section of the positioning disk described in the embodiment. Figure 2 ; Figure 7 This is a schematic diagram illustrating the assembly tool for the small aspect ratio threaded rotary body mechanism described in the embodiment. Figure 8 This is an isometric view of the assembly mechanism to be assembled in the assembly tool for the small length-to-diameter ratio threaded rotary body mechanism described in the embodiment.

[0016] In the diagram: 1. Fixed plate; 2. Double-ended stud; 3. Locating pin; 4. Locating plate; 41. Locating plate; 42. Tightening nut; 5. Pressure cap; 51. Locating groove; 52. Through hole; 6. Nut; 7. Mechanism to be assembled; 71. External threaded connector; 72. Internal component; 73. Internal threaded connector. Detailed Implementation

[0017] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings and specific examples.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not 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 the invention. Furthermore, the terms "first," "second," etc., 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 with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In mechanical products, there is a type of mechanism with a small length-to-diameter ratio rotary connector using a threaded connection (i.e., mechanism 7 to be assembled), such as... Figure 1 As shown, the mechanism includes an external threaded connector 71, an internal component 72, and an internal threaded connector 73. Due to the limitations of the operating environment, the external threaded connector 71 lacks a tightening drive position. Currently, the assembly of this type of mechanism is usually completed by fixing the external threaded connector 71 and driving the internal threaded connector 73 to tighten, or by manually tightening slowly with the aid of visual observation. These assembly methods cannot achieve the assembly of the mechanism under certain extreme operating conditions. Even if they can be operated, they often result in difficulty in ensuring coaxiality, low assembly efficiency, and damage to the outer surface of the mechanism.

[0021] Clearly, traditional assembly methods suffer from problems such as poor precision and low efficiency. They not only fail to achieve rapid assembly but also damage the structure of the mechanism.

[0022] To address the above problems, this application provides an assembly tool for a small aspect ratio threaded rotary mechanism, such as... Figure 2 As shown, it includes a fixed plate 1, a double-ended stud 2, a positioning pin 3, a positioning plate 4, a pressure cap 5, and a nut 6.

[0023] In specific embodiments, such as Figure 3 and Figure 4 As shown, when the assembly of the mechanism 7 begins, the fixed plate 1 is held in a vise and placed above the fixed worktable, with its upper surface horizontal; the shorter end of the double-ended stud 2 is placed above the fixed plate 1, and the two are threadedly connected; the positioning plate 4 is independently placed above the double-ended stud 2, as shown. Figure 5 and Figure 6 As shown, the positioning plate 4 includes a positioning plate 41 and a tightening nut 42. The positioning plate 41 is placed at the bottom, and the tightening nut 42 is placed in the center at the top. The positioning pin 3 is placed in the corresponding positioning pin hole of the positioning plate 41. The pressure cover 5 is placed independently above the positioning plate 4. The nut 6 is placed independently above the pressure cover 5. When the assembly tool of the small length-diameter ratio threaded rotary body mechanism is used, the double-ended stud 2 passes through the internal threaded connector 73 at the bottom of the mechanism to be assembled 7, the positioning plate 4 and the pressure cover 5, and the nut 6 and the double-ended stud 2 connect the positioning plate 4 and the pressure cover 5 into a whole.

[0024] In a specific embodiment, to facilitate the clamping of tools by the vise, such as Figure 1 , Figure 2 and Figure 8 As shown, the fixed plate 1 has a flat upper surface and a boss lower surface. The upper surface of the fixed plate 1 is provided with threaded holes for assembly with the double-ended stud 2.

[0025] In this embodiment, there are four nuts 6, which are evenly distributed above the pressure cover 5 along the circumference of the pressure cover 5. The double-ended studs 2 are correspondingly arranged with the nuts 6. There are two positioning pins 3, which are evenly distributed along the circumference of the positioning disc 4 and do not interfere with the double-ended studs 2.

[0026] For ease of assembly, such as Figure 7 and Figure 8 As shown, the positioning plate 41 has a hollow inner boss structure. The inner boss of the positioning plate 41 cooperates with the outer boss on the top of the external threaded connector 71. The diameter e of the inner boss of the positioning plate 41 should be slightly larger than the diameter f of the outer boss of the external threaded connector 71, and the optimal value is 2mm≤ef≤5mm.

[0027] To achieve precise positioning, the two ends of the positioning pin 3 are connected to the positioning pin holes on the positioning plate 41 and the external threaded connector 71, respectively. The positioning pin 3 and the positioning pin hole have a transition fit relationship, and the hole diameter fit clearance △φ (-0.015mm, +0.016mm) is most suitable.

[0028] In this embodiment, the bottom of the pressure cap 5 is provided with a positioning groove that mates with the positioning plate 41. A through hole is provided above the positioning groove, so that the tightening nut 42 on the positioning plate 4 is exposed above the pressure cap 5, making it convenient for a torque wrench to apply force. The positioning plate 4 and the pressure cap 5 have matching requirements. The diameter c of the positioning groove should be slightly larger than the diameter d of the positioning plate, and the height a of the positioning groove should be slightly larger than the height b of the positioning plate. The optimal values ​​are 0 < cd ≤ 2 mm and 0 < ab ≤ 1 mm.

[0029] Two locating pins 3 connect the locating disc 4 and the external threaded connector 71 into a whole. Rotating the tightening nut 42 can pre-tighten the external threaded connector 71, but this alone cannot achieve the specified torque tightening. The pressure cap 5 passes through the double-ended stud 2 and is fastened above the locating disc 4. After it is firmly fixed with the nut 6, the assembly tool and the assembly mechanism 7 are fixed together. Then, a torque wrench can be used to apply force to the tightening nut 42 on the locating disc 4, thereby achieving the specified torque tightening.

[0030] In this embodiment, the tightening nut 42 has an external hexagonal inner hole structure. To facilitate the free passage of the upper smooth rod of the inner component 72 through the inner hole of the tightening nut 42, the inner hole diameter should be slightly larger than the diameter of the upper smooth rod of the inner component 72.

[0031] The above method can effectively solve the problems of low hole accuracy and low assembly efficiency in the assembly of small length-to-diameter ratio threaded rotary body mechanisms, while the entire assembly process will not damage the surface quality of the mechanism.

[0032] Furthermore, this invention is applicable to the assembly of small length-to-diameter ratio threaded rotary body mechanisms in various types of mechanical products, and is particularly suitable for various types of small-batch products.

[0033] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and principles of the described embodiments, and these modifications and variations should also be considered within the scope of protection of the present invention.

Claims

1. An assembly tool for a small aspect ratio threaded rotary mechanism, characterized in that: Includes a fixed plate (1), and above the fixed plate, from bottom to top, a double-headed stud (2), a positioning plate (4), a pressure cap (5) and a nut (6); One end of the double-ended stud (2) is threaded to the fixed plate (1), and the other end passes through the internal threaded connector (73), positioning plate (4) and pressure cap (5) at the bottom of the assembly mechanism (7) and is threaded to the nut (6). The bottom of the positioning plate (4) is connected to the top of the assembly mechanism (7) by the external threaded connector (71) via the positioning pin (3); The positioning plate (4) includes a positioning plate (41) and a tightening nut (42), with the positioning plate (41) positioned below and the tightening nut (42) positioned above in the center; The bottom of the pressure cap (5) is provided with a positioning groove that cooperates with the positioning plate, and a through hole is provided above the positioning groove.

2. The assembly tool for a small aspect ratio threaded rotary mechanism according to claim 1, characterized in that, The upper surface of the fixed plate (1) is a planar structure with threaded holes, and the lower surface is a boss structure.

3. The assembly tool for a small aspect ratio threaded rotary mechanism according to claim 1, characterized in that, The diameter c of the positioning groove and the diameter d of the positioning plate satisfy the relationship 0 < cd ≤ 2 mm; the height a of the positioning groove and the height b of the positioning plate (41) satisfy the relationship 0 < ab ≤ 1 mm.

4. The assembly tool for a small aspect ratio threaded rotary mechanism according to claim 1, characterized in that, The inner diameter of the tightening nut (42) is larger than the diameter of the light rod above the internal part (72) of the assembly mechanism (7), so that the light rod can freely pass through the inner hole of the tightening nut (42).

5. The assembly tool for a small aspect ratio threaded rotary mechanism according to claim 1, characterized in that, The positioning plate (41) is a hollow inner boss structure. The inner boss of the positioning plate (41) cooperates with the outer boss on the top of the external threaded connector (71). The diameter e of the inner boss of the positioning plate (41) and the diameter f of the outer boss of the external threaded connector (71) satisfy the relationship that 2mm≤ef≤5mm.

6. The assembly tool for a small aspect ratio threaded rotary mechanism according to claim 1, characterized in that, The two ends of the positioning pin (3) are connected to the positioning pin holes on the positioning plate (41) and the external threaded connector (71) respectively. The positioning pin (3) and the positioning pin hole are in a transition fit relationship, and the hole diameter fit clearance is △φ (-0.015mm, +0.016mm).

7. The assembly tool for a small aspect ratio threaded rotary mechanism according to claim 1, characterized in that, There are four nuts (6), which are evenly distributed on the top of the cover (5) along the circumference of the cover (5), and the double-headed studs (2) are correspondingly set with the nuts (6).

8. The assembly tool for a small aspect ratio threaded rotary mechanism according to claim 1, characterized in that, The positioning pin (3) is provided in two parts, which are evenly distributed along the circumference of the positioning disk (4) and do not interfere with the double-headed stud (2).

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