Special installation tool for elastic cylindrical pin

Abstract

The utility model relates to elastic cylindrical pin installation technical field, and disclose elastic cylindrical pin special mounting tool, including fixed base and detachable connection on the clamping seat of fixed base, clamping seat is used for clamping work piece, and the locating piece that installs on fixed base is used for positioning work piece, the locating piece is used for placing elastic cylindrical pin body, still includes the thimble assembly of sliding connection in guide hole, is used for along the elastic cylindrical pin body of axial push and inserts work piece's pin hole, clamping seat is equipped with a plurality of adjusting stud, is used for fine adjustment elastic cylindrical pin body's position to adjust elastic cylindrical pin body's centering position, the utility model discloses through the multiple positioning of locating pin and thimble assembly, the fine adjustment function of combination adjusting stud, realize elastic cylindrical pin's quick, high accuracy centering, effectively prevent deflection and jam, in addition, cylindrical pin thimble and locating pin can be replaced, support a plurality of specifications elastic cylindrical pin assembly, and the versatility is strong.

Description

Technical Field

[0001] This utility model relates to the field of flexible cylindrical pin installation technology, specifically to a special installation tool for flexible cylindrical pins. Background Technology

[0002] A spring pin (also known as a coiled elastic pin or spring pin) is a fastening connector that relies on its own elastic deformation to achieve an interference fit with a mounting hole. It is widely used in machinery, automobiles, rail transportation, power tools, and automation equipment. Its structure typically consists of a thin-walled cylinder with a longitudinal opening. The material's elasticity generates radial tension after being pressed into the hole, thus achieving reliable positioning and anti-loosening functions.

[0003] In actual assembly, the installation quality of the elastic cylindrical pin directly affects the connection strength, component life and overall machine reliability. In conventional assembly methods, manual hammering or general-purpose clamps are typically used for installation, which presents the following significant problems: 1) Difficulty in clamping and positioning: The elastic cylindrical pins are small in size and have smooth surfaces, making it difficult to hold them stably with ordinary bench vises or hand tools, and they are prone to slippage or displacement; 2) Poor equipment compatibility: Ordinary bench vises have low stroke accuracy, a large clamping range, and insufficient parallelism of the clamping surfaces, making it difficult to meet the assembly requirements of micro-sized elastic cylindrical pins, and centering and positioning accuracy are difficult to guarantee; 3) Prone to assembly misalignment: During the pressing process, due to insufficient guidance and uneven force, the elastic cylindrical pins are prone to skewing, jamming, or even bending deformation, leading to an increase in scrap rate; 4) Pin body is easily damaged and deformed: Traditional installation methods often subject the elastic cylindrical pins to non-axial or uneven loads, causing local plastic deformation or surface damage, affecting connection reliability and fatigue life; 5) Low assembly efficiency: Due to the difficulty in clamping, poor centering accuracy, and frequent failures, manual assembly is time-consuming, labor-intensive, and it is difficult to guarantee the consistency of assembly quality.

[0004] To address the aforementioned issues, there is an urgent need to develop a specialized installation fixture for small-sized elastic cylindrical pins that can achieve stable clamping, precise positioning, axial force application, and efficient assembly, thereby significantly improving assembly quality, protecting the integrity of the pin, and reducing operational difficulty. Utility Model Content

[0005] This utility model provides a special installation fixture for flexible cylindrical pins, featuring adjustable clamping and positioning, axial pushing and guiding, and overtravel protection structures. It effectively solves problems mentioned in the background art, such as difficulty in clamping and positioning, poor equipment compatibility, and assembly misalignment. This fixture not only significantly improves the assembly accuracy and efficiency of small-sized flexible cylindrical pins but also achieves non-destructive, standardized, and universal assembly processes.

[0006] This utility model provides the following technical solution: A special installation fixture for flexible cylindrical pins includes a fixed base and further includes: a clamping base detachably connected to the fixed base, forming a clamping space between the clamping base and the fixed base for clamping a workpiece; the fixed base is equipped with a positioning element for positioning the workpiece; and a pin assembly, wherein the clamping base has a guide hole for accommodating the body of the flexible cylindrical pin, the pin assembly is slidably connected to the guide hole for axially pushing the body of the flexible cylindrical pin into the pin hole of the workpiece, and the clamping base is internally threaded with multiple adjusting studs, one end of which extends into the guide hole and abuts against the side wall of the body of the flexible cylindrical pin for adjusting the position of the flexible cylindrical pin in the guide hole.

[0007] As a preferred technical solution of this utility model, the positioning component includes a positioning pin, one end of which is provided with a threaded section, and the fixed base is provided with a second threaded hole that mates with the threaded section. The positioning pin is installed in the second threaded hole through the threaded section. The other end of the positioning pin is used to extend into the pin hole of the workpiece during assembly to achieve positioning of the workpiece.

[0008] As a preferred technical solution of this utility model, a V-shaped clamping surface with a V-shaped structure is fixedly connected inside the fixed base, and a clamping plane is provided inside the clamping base. The V-shaped clamping surface and the clamping plane are arranged opposite to each other to form the clamping space for clamping the workpiece.

[0009] As a preferred embodiment of this utility model, the fixing seat is provided with a first clearance groove on both sides of the V-shaped clamping surface, and the clamping seat is provided with a second clearance groove at both ends of the clamping plane.

[0010] As a preferred embodiment of this utility model, the fixed base is provided with a plurality of evenly distributed first threaded holes, and the clamping base is provided with through holes corresponding to the first threaded holes. The clamping base is detachably connected to the fixed base by bolts that pass through the through holes and are screwed into the first threaded holes.

[0011] As a preferred embodiment of this utility model, the ejector assembly includes a pressure-bearing guide post and a cylindrical pin ejector, the cylindrical pin ejector being threadedly connected to the pressure-bearing guide post; the end of the cylindrical pin ejector away from the pressure-bearing guide post is used to abut against the elastic cylindrical pin body, and the side wall of the pressure-bearing guide post is slidably engaged with the inner wall of the guide hole.

[0012] As a preferred technical solution of this utility model, a guide head is fixedly connected to one end of the cylindrical pin away from the pressure-bearing guide post. The guide head is used to partially extend into the interior of the elastic cylindrical pin body during assembly.

[0013] As a preferred embodiment of this utility model, the clamping seat is provided with a plurality of third threaded holes, the axis of the third threaded holes being perpendicular to the axis of the guide hole.

[0014] Compared with the prior art, this utility model provides a special installation tool for flexible cylindrical pins, which has the following beneficial effects: 1. In this special installation fixture for elastic cylindrical pins, the multiple positioning of the locating pin and the ejector pin assembly, as well as the fine-tuning structure of the adjusting stud, enables the rapid and high-precision alignment of the elastic cylindrical pin, effectively preventing skewing and jamming. In addition, both the ejector pin and the locating pin are replaceable, supporting the assembly of various specifications of elastic cylindrical pins, and has strong versatility.

[0015] 2. In this special installation tool for elastic cylindrical pins, by installing a positioning pin on the fixed seat, not only can the workpiece be mechanically limited, but the assembly depth of the elastic cylindrical pin can also be adjusted. It has mechanical limiting and clearance design, safe and reliable operation, no damage during assembly, and greatly reduces the scrap rate.

[0016] 3. This special installation tool for flexible cylindrical pins has a compact structure and can be installed in a regular bench vise without the need for special equipment, which significantly improves assembly efficiency and consistency, making it particularly suitable for small-batch precision assembly scenarios.

[0017] The parts not mentioned in this device are the same as or can be implemented using existing technologies. The multi-positioning of the positioning pin and ejector pin assembly and the fine-tuning structure of the adjusting stud of this utility model enable the rapid and high-precision centering of the elastic cylindrical pin, effectively preventing skewing and jamming. In addition, both the cylindrical pin ejector pin and the positioning pin are replaceable, supporting the assembly of various specifications of elastic cylindrical pins, and have strong versatility. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0019] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a three-dimensional schematic diagram of the fixing base of this utility model; Figure 4 This is a three-dimensional schematic diagram of the clamping base of this utility model; Figure 5 This is a schematic diagram of the ejector pin assembly for this utility model; Figure 6 This is a cross-sectional view of the ejector pin assembly of this utility model.

[0020] In the diagram: 1. Fixed base; 101. First threaded hole; 102. Second threaded hole; 103. V-shaped clamping surface; 104. First clearance groove; 105. Locating pin; 2. Clamping base; 201. Clamping plane; 202. Guide hole; 203. Through hole; 204. Second clearance groove; 205. Third threaded hole; 3. Ejector pin assembly; 301. Pressure-bearing guide post; 302. Cylindrical pin ejector pin; 4. Elastic cylindrical pin body; 5. Bolt; 6. Workpiece; 7. Adjusting stud. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example: Reference Figures 1-6The special installation fixture for elastic cylindrical pins includes a fixed base 1, and further includes: a clamping base 2 detachably connected to the fixed base 1, forming a clamping space between the clamping base 2 and the fixed base 1 for clamping the workpiece 6, and a positioning element for positioning the workpiece 6 is installed on the fixed base 1; and a pin assembly 3. The clamping base 2 has a guide hole 202 for placing the elastic cylindrical pin body 4. The guide hole 202 is a stepped hole, and the inner diameter of the small end is preferably 6mm, which is suitable for assembling elastic cylindrical pin bodies 4 with a diameter less than 6mm. The pin assembly 3 is slidably connected in the guide hole 202 for axially pushing the elastic cylindrical pin body 4 into the pin hole of the workpiece 6. The positioning element is located at the end of the pin hole away from the elastic cylindrical pin body 4. Moreover, the clamping base 2 is provided with a plurality of adjusting studs 7 connected by threads. There are two to four adjusting studs 7, preferably four. One end of the adjusting stud 7 extends into the guide hole 202 and abuts against the side wall of the elastic cylindrical pin body 4 for fine adjustment of the position of the elastic cylindrical pin body 4. Here, the clamping seat 2 has multiple third threaded holes 205, four in total. Adjusting studs 7 are threaded into the corresponding third threaded holes 205, and the extended axis of each third threaded hole 205 coincides with and is perpendicular to the axis of the guide hole 202. On the cross-sectional projection of the guide hole 202, the four third threaded holes 205 are evenly distributed around the circumference of the guide hole 202, commonly referred to as the front, back, left, and right sides. By rotating the corresponding adjusting studs 7 to abut against the side wall of the elastic cylindrical pin body 4, the holes can be moved from four directions. The position of the elastic cylindrical pin body 4 is finely adjusted, that is, the coordinates and angles of the elastic cylindrical pin body 4 are finely adjusted to ensure that the elastic cylindrical pin body 4 is smoothly inserted into the pin hole on the workpiece 6. In addition, on the projection of the axial section of the guide hole 202, the front and rear two third threaded holes 205 are coaxial, and the left and right two third threaded holes 205 are coaxial. Moreover, the axes of the front and rear two and the axes of the left and right two are distributed vertically along the axis of the guide hole 202, with a spacing of 1-4mm, preferably 2mm, which can avoid interference with the adjusting stud 7 and affect normal use.

[0023] The positioning component includes a positioning pin 105 with a screw at one end. A second threaded hole 102 is provided in the fixed base 1. One end of the positioning pin 105 is threaded into the second threaded hole 102, and the other end of the positioning pin 105 extends into the pin hole of the workpiece 6. It is used to position the pin hole of the workpiece 6 during assembly. In use, after the workpiece 6 is placed in the clamping space, a suitable positioning pin 105 is selected according to the inner diameter of the pin hole on the workpiece 6, and it is installed in the fixed base 1, extending into the pin hole of the workpiece 6. Then, the clamping base 2 is used to fix the workpiece 6 between the fixed base 1 and the clamping base 2. In addition, by rotating the positioning pin 105, the depth of insertion into the pin hole of the workpiece 6 can be adjusted, which can control the depth of insertion of the elastic cylindrical pin body 4 into the pin hole, avoid overtravel, and improve assembly accuracy.

[0024] A V-shaped clamping surface 103 with a V-shape is fixedly connected inside the fixed base 1, and a clamping plane 201 is fixedly connected inside the clamping base 2. The two V-shaped clamping surfaces 103 and the clamping plane 201 form a clamping space for clamping the workpiece 6. A first clearance groove 104 is provided on the fixed base 1, and the first clearance groove 104 is located on both sides of the V-shaped clamping surface 103. A second clearance groove 204 is provided inside the clamping base 2, and the second clearance groove 204 is located at both ends of the clamping plane 201. When the workpiece 6 is placed in the clamping space, interference between the fixed base 1 and the clamping base 2 and the workpiece can be reduced, which would prevent the workpiece 6 from being clamped correctly.

[0025] Multiple evenly distributed first threaded holes 101 are provided on the fixed base 1. There are two to six first threaded holes 101, preferably four, and they are located at the four corners of the fixed base 1. Through holes 203 corresponding to the first threaded holes 101 are provided on the clamping base 2. The clamping base 2 is detachably connected to the fixed base 1 by bolts 5. That is, after the workpiece is placed in the clamping space, the bolts 5 are inserted into the through holes 203 and threadedly connected to the corresponding first threaded holes 101. This not only fixes the clamping base 2 on the fixed base 1, but also clamps the workpiece 6.

[0026] The ejector assembly 3 includes a pressure-bearing guide post 301, with a cylindrical pin ejector 302 internally threaded onto the pressure-bearing guide post 301. The end of the cylindrical pin ejector 302 away from the pressure-bearing guide post 301 abuts against the elastic cylindrical pin body 4, and the side wall of the pressure-bearing guide post 301 abuts against the inner wall of the guide hole 202. A guide head is fixedly connected to the end of the cylindrical pin ejector 302 away from the pressure-bearing guide post 301. The guide head extends into the elastic cylindrical pin body 4, limiting the radial displacement of the elastic cylindrical pin body 4 and ensuring that the thrust is always applied axially. By threading the cylindrical pin ejector 302 to the pressure-bearing guide post 301, the elastic cylindrical pin body 4 can be flexibly adjusted according to different specifications, significantly improving the versatility and applicability of the tooling.

[0027] In this invention, during assembly, the workpiece 6 is first placed on the fixed base 1, and the position and direction of the pin hole of the workpiece 6 are initially positioned by the positioning pin 105. Then, the bolt 5 is tightened evenly to push the clamping base 2 to press the workpiece 6. Next, the elastic cylindrical pin body 4 is placed into the guide hole 202, and then the ejector pin assembly 3 is installed into the guide hole 202 so that the cylindrical pin ejector pin 302 abuts against the top of the elastic cylindrical pin body 4. In addition, the guide head is inserted into the elastic cylindrical pin body 4. Then, the adjusting stud 7 is adjusted to finely adjust the pressing coordinates and angle of the elastic cylindrical pin body 4. Finally, the ejector pin assembly 3 is pushed by the bench vise, and the cylindrical pin ejector pin 302, guided by the guide hole 202, smoothly presses the elastic cylindrical pin body 4 into the pin hole of the workpiece 6 along the axial direction. The guide head can limit the sway of the elastic cylindrical pin body 4, and the high-position design of the positioning pin 105 provides overtravel mechanical protection, ultimately realizing the fast, accurate, and non-destructive pressing of the small-sized elastic cylindrical pin body 4.

[0028] This utility model provides an innovative installation fixture for flexible cylindrical pins. Its core lies in the integration of multiple positioning, clamping, and guiding modules, enabling the precision assembly of small-sized pins. Its main functions and advantages are reflected in the following aspects: This tooling, through the combination of replaceable positioning pin 105 and multi-directional fine-tuning stud 7, achieves micron-level alignment between workpiece 6 and elastic cylindrical pin body 4, effectively preventing assembly misalignment and pin bending, and improving the assembly qualification rate by more than 95%.

[0029] The ejector pin assembly 3 adopts a replaceable design and an axial guide mechanism to ensure that the thrust is strictly applied along the axial direction. Combined with the guide head limiting structure, it completely avoids damage and irregular deformation of the elastic cylindrical pin body 4.

[0030] The clamping base 2 and the fixed base 1 adopt the design of inclined clamping and clearance groove, which can be used for various sizes of small workpieces 6 and has strong versatility; the overall structure is compact and can be installed in ordinary bench vises, which greatly reduces the cost of special equipment.

[0031] The high-position design of the positioning pin 105 has a mechanical limiting function. The ejector pin assembly 3 and the positioning pin 105 do not interfere with each other, making the operation safe and reliable, significantly improving assembly efficiency and consistency, and making it particularly suitable for small-batch precision assembly scenarios.

[0032] In summary, this invention, through its adjustable clamping and positioning, axial pushing and guiding, and overtravel protection design, not only significantly improves the assembly accuracy and efficiency of small-sized elastic cylindrical pins, but also achieves non-destructive, standardized, and universal assembly. Using this tooling, precision assembly of small parts can be completed using a standard bench vise, effectively solving problems such as clamping difficulties, easy misalignment, deformation, and damage in traditional manual assembly. This significantly improves assembly efficiency and quality, simplifies the process, reduces operational difficulty, and demonstrates significant overall performance advantages.

[0033] Components not described in detail in this article are existing technologies.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A special installation fixture for elastic cylindrical pins, including a fixing seat (1), characterized in that, Also includes: A clamping seat (2) is detachably connected to the fixed seat (1), and a clamping space for clamping the workpiece (6) is formed between the clamping seat (2) and the fixed seat (1). A positioning element for positioning the workpiece (6) is installed on the fixed seat (1). The ejector assembly (3) has a guide hole (202) on the clamping seat (2) for accommodating the elastic cylindrical pin body (4). The ejector assembly (3) is slidably connected in the guide hole (202) for pushing the elastic cylindrical pin body (4) into the pin hole of the workpiece (6) along the axial direction. The clamping seat (2) is internally threaded with a plurality of adjusting studs (7). One end of the adjusting stud (7) extends into the guide hole (202) and abuts against the side wall of the elastic cylindrical pin body (4) to adjust the position of the elastic cylindrical pin body (4) in the guide hole (202).

2. The special installation tool for the elastic cylindrical pin according to claim 1, characterized in that, The positioning component includes a positioning pin (105), one end of which is provided with a threaded section. The fixed base (1) is provided with a second threaded hole (102) that mates with the threaded section. The positioning pin (105) is installed in the second threaded hole (102) through the threaded section. The other end of the positioning pin (105) is used to extend into the pin hole of the workpiece (6) during assembly to achieve positioning of the workpiece.

3. The special installation tool for the elastic cylindrical pin according to claim 1, characterized in that, The fixed base (1) has a V-shaped clamping surface (103) with a V-shaped structure, and the clamping base (2) has a clamping plane (201). The V-shaped clamping surface (103) and the clamping plane (201) are arranged opposite to each other, together forming the clamping space for clamping the workpiece (6).

4. The special installation tool for the elastic cylindrical pin according to claim 3, characterized in that, The fixing seat (1) has a first clearance groove (104) on both sides of the V-shaped clamping surface (103), and the clamping seat (2) has a second clearance groove (204) at both ends of the clamping plane (201).

5. The special installation tool for the elastic cylindrical pin according to claim 4, characterized in that, The fixed seat (1) has a plurality of evenly distributed first threaded holes (101), and the clamping seat (2) has a through hole (203) corresponding to the first threaded holes (101). The clamping seat (2) is detachably connected to the fixed seat (1) by a bolt (5) that passes through the through hole (203) and is screwed into the first threaded hole (101).

6. The special installation tool for the elastic cylindrical pin according to claim 1, characterized in that, The ejector pin assembly (3) includes a pressure-bearing guide post (301) and a cylindrical pin ejector pin (302). The cylindrical pin ejector pin (302) is threadedly connected to the pressure-bearing guide post (301). The end of the cylindrical pin ejector pin (302) away from the pressure-bearing guide post (301) is used to abut against the elastic cylindrical pin body (4). The side wall of the pressure-bearing guide post (301) is slidably engaged with the inner wall of the guide hole (202).

7. The special installation tool for the elastic cylindrical pin according to claim 6, characterized in that, The cylindrical pin (302) is fixedly connected to a guide head at one end away from the pressure-bearing guide post (301). The guide head is used to partially extend into the interior of the elastic cylindrical pin body (4) during assembly.

8. The special installation tool for the elastic cylindrical pin according to claim 1, characterized in that, The clamping seat (2) is provided with a plurality of third threaded holes (205), and the axis of the third threaded hole (205) intersects perpendicularly with the axis of the guide hole (202).

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