Flangeless tube shell precise positioning device

Abstract

The utility model relates to mechanical manufacturing technical field discloses a kind of flangeless tube shell accurate positioning device, including upper substrate and ground base, the outside of upper substrate is provided with fixed plate, positioning assembly is installed in the outside of ground base, the outside of upper substrate is installed with clamping device, the positioning assembly includes bottom tray, the bottom tray is fixedly connected at the top of ground base, the top of bottom tray is fixedly connected with locating expansion pin, the inside of locating expansion pin is provided with lower workpiece.In the utility model, six groups of pressing devices are symmetrically distributed in the thick circular ring, spherical surface cooperation and elastic force are used, the outer circle shape of tube shell is automatically adapted, eccentric error is eliminated, positioning accuracy is improved, multi-layer thread hole layout is combined with conical opening limiting, uniform distribution of clamping force is ensured, and tube shell is prevented from deviating due to gravity or vibration.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing technology, and in particular to a flangeless tube shell precision positioning device. Background Technology

[0002] In the field of mechanical manufacturing and assembly, flangeless tube shells are commonly used components, and their accurate positioning during processing and assembly is crucial to product quality and production efficiency. Because flangeless tube shells lack the positioning reference provided by traditional flange structures, it is difficult to achieve high-precision operation during fixing and positioning using conventional methods.

[0003] Traditional clamping devices rely on the tube flange or a single clamping point, making flangeless tubes prone to shifting or tilting, thus compromising alignment accuracy. Ordinary spring clamping devices apply uneven force and cannot adapt to the outer shape of the tube, easily causing the workpiece to slip due to gravity or vibration. Existing technologies employ multi-stage adjustment mechanisms or pneumatic devices, which are costly and cumbersome to operate, making them unsuitable for rapid assembly requirements. Most existing technologies rely on tube flange positioning, and the clamping force is applied only at a single point, failing to meet the high-precision requirements of flangeless tubes. Therefore, a precision positioning device for flangeless tubes is proposed to address these issues. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a flangeless tube shell precision positioning device, which aims to improve the problems of uneven force application, inability to adapt to the outer circle shape of the tube shell, and easy slippage of the workpiece due to gravity or vibration in the existing ordinary spring clamping device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A flangeless tube shell precision positioning device includes an upper base plate and a ground base. A fixing plate is provided on the outside of the upper base plate, a positioning component is installed on the outside of the ground base, and a clamping device is installed on the outside of the upper base plate. The positioning component includes a bottom tray, which is fixedly connected to the top of the ground base. A positioning pin is fixedly connected to the top of the bottom tray, and a lower workpiece is disposed inside the positioning pin. As a further description of the above technical solution: A screw is provided in the middle of the bottom tray, and the screw is threaded to the middle of the ground base; As a further description of the above technical solution: The clamping device includes a thick circular ring, which is fixedly connected to the top of the upper substrate. A pressure ball is slidably connected to the middle of the thick circular ring. A pressure cap is provided on one side of the pressure ball. A pressure spring is fixedly connected to the outside of the pressure cap. A pressure screw is fixedly connected to the outside of the pressure spring. The pressure screw is threadedly connected to the middle of the thick circular ring. As a further description of the above technical solution: The clamping device is fixedly connected to the outside of the upper base plate, and an upper workpiece is provided in the middle of the clamping device. The front end of the clamping ball is in contact with the surface of the upper workpiece. As a further description of the above technical solution: A limiting cone opening is provided in the middle of the thick circular ring, and the clamping ball is placed in the middle of the limiting cone opening; As a further description of the above technical solution: The upper substrate and the upper workpiece are fixed by the fixing plate; As a further description of the above technical solution: A cylindrical pin is fixedly connected to the middle of the bottom tray; As a further description of the above technical solution: The thick circular ring has a specially designed threaded hole in the middle, and the clamping screw is threaded into the middle of the specially designed threaded hole.

[0006] This utility model has the following beneficial effects: 1. In this utility model, by setting six sets of clamping devices symmetrically distributed in the thick circular ring, the spherical fit and elastic force are used to automatically adapt to the outer circle shape of the tube shell, eliminate eccentric error, and improve positioning accuracy. The multi-layer threaded hole layout combined with the conical opening limit ensures that the clamping force is evenly distributed and avoids the tube shell from shifting due to gravity or vibration.

[0007] 2. In this utility model, a mechanical spring clamping method is adopted, which eliminates the need for complex pneumatic or electric systems, reducing manufacturing costs and maintenance difficulty. By adjusting the preload with screws, it can quickly adapt to tube shells of different sizes, thereby improving production efficiency. Attached Figure Description

[0008] Figure 1 This is a three-dimensional schematic diagram of a flangeless tube shell precision positioning device proposed in this utility model; Figure 2 This is a schematic diagram of the positioning pin of a flangeless tube shell precision positioning device proposed in this utility model; Figure 3 This is a schematic diagram of the structure of the fixing plate of a flangeless tube shell precision positioning device proposed in this utility model. Figure 4This is a schematic diagram of the upper workpiece of a flangeless tube shell precision positioning device proposed in this utility model; Figure 5 This is a schematic diagram of the pressure ball structure of a flangeless tube shell precision positioning device proposed in this utility model; Figure 6 This is a schematic diagram of the limiting cone opening of a flangeless tube shell precision positioning device proposed in this utility model; Figure 7 This is a schematic diagram of the structure of the thick circular ring of the flangeless tube shell precision positioning device proposed in this utility model; Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0009] Legend: 1. Upper base plate; 2. Lower workpiece; 3. Bottom tray; 4. Ground base; 5. Positioning pin; 6. Fixing plate; 7. Clamping device; 8. Thick ring; 9. Upper workpiece; 10. Special threaded hole; 11. Clamping screw; 12. Clamping cap; 13. Clamping ball; 14. Limiting cone; 15. Clamping spring; 16. Cylindrical pin; 17. Screw. Detailed Implementation

[0010] 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.

[0011] Reference Figures 1-8 This utility model provides an embodiment of a flangeless tube shell precision positioning device, comprising an upper base plate 1 and a ground base 4. A fixing plate 6 is disposed on the outside of the upper base plate 1, and a positioning assembly is mounted on the outside of the ground base 4. A clamping device 7 is also mounted on the outside of the upper base plate 1. The positioning assembly includes a bottom tray 3, which is fixedly connected to the top of the ground base 4. A positioning expansion pin 5 is fixedly connected to the top of the bottom tray 3, and a lower workpiece 2 is disposed inside the positioning expansion pin 5. The positioning expansion pin 5 connects to the lower workpiece 2 to ensure the reference positioning accuracy. A screw 17 is disposed in the middle of the bottom tray 3, and the screw 17 is threadedly connected to the middle of the ground base 4, fixing the bottom tray 3 to the ground base 4. A cylindrical pin 16 is fixedly connected to the middle of the bottom tray 3. Two diagonally distributed cylindrical pins 16 achieve initial coarse positioning. This step utilizes the cylindrical pins 16 to achieve preliminary positioning of the tube shell on the horizontal plane, determining its approximate position.

[0012] Reference Figures 1-8The clamping device 7 includes a thick circular ring 8, which is fixedly connected to the top of the upper base plate 1. A pressure ball 13 is slidably connected to the middle of the thick circular ring 8. A pressure cap 12 is provided on the pressure ball 13. A pressure spring 15 is fixedly connected to the outside of the pressure cap 12. A pressure screw 11 is fixedly connected to the outside of the pressure spring 15. The pressure screw 11 is threadedly connected to the middle of the thick circular ring 8. The clamping device 7 is fixedly connected to the outside of the upper base plate 1. An upper workpiece 9 is provided in the middle of the clamping device 7. The front end of the pressure ball 13 contacts the surface of the upper workpiece 9. A limiting cone 14 is opened in the middle of the thick circular ring 8, and the pressure ball 13 is placed in the middle of the limiting cone 14. The upper base plate 1 and the upper workpiece 9 are fixed by a fixing plate 6. A special threaded hole 10 is opened in the middle of the thick circular ring 8, and the pressure screw 11 is threadedly connected to the middle of the special threaded hole 10. A limiting cone 14 is opened in the middle of the thick circular ring 8, and the clamping ball 13 is placed inside the cone, with its front end contacting the outer surface of the upper workpiece 9. The clamping screw 11 is screwed into the thick circular ring 8 through the special threaded hole 10. The clamping spring 15 is compressed by adjusting the thread. The spring force is transmitted to the clamping ball 13 through the clamping cap 12, causing the clamping ball 13 to move towards the center of the cone and generate radial clamping force. Tightening the clamping screw 11, the clamping spring 15 pushes the clamping ball 13 to apply pressure to the outer edge of the tube shell along the limiting cone 14. The six sets of clamping devices work synchronously, and the upper end of the tube shell is evenly clamped by the spherical contact. The axial positioning of the bottom expansion pin and the multi-directional clamping force at the top combine to ensure that the flangeless tube shell is precisely constrained in the axial, radial and circumferential directions, meeting the requirements of high-precision assembly or processing.

[0013] Working principle: The clamping ball 13 and the clamping cap 12 adopt a spherical mating structure, allowing the clamping ball 13 to adaptively adjust according to the shape and angle of the outer circle of the tube shell. Six sets of such clamping devices are arranged in the upper and lower layers of threaded holes symmetrically distributed in the thick circular ring 8. When all the clamping screws 11 are tightened simultaneously, the six sets of clamping devices apply pressure to the outer circle of the tube shell from different directions, forming a uniform ring force. Regardless of whether the outer circle of the tube shell is regular, it can fit tightly and clamp evenly, eliminating eccentric errors. The lower workpiece 2 is fixed to the bottom tray 3 by a positioning expansion pin, and the upper base plate 1 drives the flangeless tube shell to descend. Once the flangeless tube shell and the lower workpiece 2 are precisely aligned and pressed together, the assembly is completed. The spherical mating structure of the clamping ball 13 and the clamping cap 12 achieves adaptive angle adjustment.

[0014] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flangeless tube shell precision positioning device, comprising an upper base plate (1) and a ground base (4), characterized in that: A fixing plate (6) is provided on the outside of the upper base plate (1), a positioning component is installed on the outside of the ground base (4), and a clamping device (7) is installed on the outside of the upper base plate (1). The positioning component includes a bottom tray (3), which is fixedly connected to the top of the ground base (4). A positioning pin (5) is fixedly connected to the top of the bottom tray (3), and a lower workpiece (2) is provided inside the positioning pin (5). The clamping device (7) includes a thick ring (8), which is fixedly connected to the top of the upper base plate (1). A pressure ball (13) is slidably connected to the middle of the thick ring (8). A pressure cap (12) is provided on one side of the pressure ball (13). A pressure spring (15) is fixedly connected to the outside of the pressure cap (12). A pressure screw (11) is fixedly connected to the outside of the pressure spring (15). The pressure screw (11) is threadedly connected to the middle of the thick ring (8).

2. The flangeless tube shell precision positioning device according to claim 1, characterized in that: A screw (17) is provided in the middle of the bottom tray (3), and the screw (17) is threaded to the middle of the ground base (4).

3. The flangeless tube shell precision positioning device according to claim 1, characterized in that: The clamping device (7) is fixedly connected to the outside of the upper base plate (1). The upper workpiece (9) is provided in the middle of the clamping device (7), and the front end of the clamping ball (13) is in contact with the surface of the upper workpiece (9).

4. The flangeless tube shell precision positioning device according to claim 1, characterized in that: A limiting cone (14) is provided in the middle of the thick ring (8), and the pressing ball (13) is placed in the middle of the limiting cone (14).

5. The flangeless tube shell precision positioning device according to claim 3, characterized in that: The upper substrate (1) and the upper workpiece (9) are fixed by the fixing plate (6).

6. The flangeless tube shell precision positioning device according to claim 1, characterized in that: A cylindrical pin (16) is fixedly connected to the middle of the bottom tray (3).

7. The flangeless tube shell precision positioning device according to claim 1, characterized in that: The thick ring (8) has a special threaded hole (10) in the middle, and the clamping screw (11) is threaded into the middle of the special threaded hole (10).

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