Internal expansion positioning mechanism

Abstract

The utility model discloses an internal expansion positioning mechanism, belongs to the technical field of welding processing equipment, and aims to solve the technical problems that in the prior art, an external clamping mode is usually adopted when a hollow pipe fitting is positioned, the occupied working space is large, the pipe fitting is difficult to play a role under the condition that the working space is narrow and the pipe fitting cannot move, and the working efficiency is low. And pipe fittings are inconvenient to replace. The device comprises a base, a connecting plate is arranged at the top of the base, a positioning shaft is arranged at the top of the connecting plate, a steel ball frame is arranged at the top of the positioning shaft, a cavity is formed in the steel ball frame, an extrusion rod in sliding connection is arranged in the cavity, a plurality of through holes are formed in the outer wall of the steel ball frame, and steel balls in sliding connection are arranged in the through holes; the workpiece is positioned from the interior of the workpiece, the occupied space is small, the workpiece can be conveniently used under the condition that the working space is narrow, meanwhile, when the workpiece needs to be replaced, only the extrusion rod needs to be driven to move downwards, the workpiece can be taken out to be replaced, and the replacing efficiency of the workpiece is guaranteed.

Description

Technical Field

[0001] This utility model relates to an internal expansion positioning mechanism, belonging to the technical field of welding processing equipment. Background Technology

[0002] Welding, also known as fusion welding, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature, or high pressure. When welding hollow pipe fittings, it is usually necessary to first position and lock the fittings to ensure their stability, thereby ensuring the stable progress of the welding process. Currently, external clamping is generally used for positioning and locking existing hollow pipe fittings.

[0003] Existing technologies typically employ external clamping for positioning hollow pipe fittings, which occupies a large working space. This method is ineffective in narrow working spaces or when the pipe fitting is immobile, and it also hinders pipe fitting replacement and reduces welding efficiency. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an internal expansion positioning mechanism to solve the problems that the prior art usually adopts external clamping when positioning hollow pipes, which occupies a large working space, is difficult to function in narrow working spaces and when the pipes are immobile, and is inconvenient for pipe replacement.

[0005] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution:

[0006] This utility model provides an internal expansion positioning mechanism, including a base, a connecting plate on the top of the base, a positioning shaft on the top of the connecting plate, a steel ball frame on the top of the positioning shaft, a cavity inside the steel ball frame, a slidably connected extrusion rod inside the cavity, and multiple through holes communicating with the cavity on the outer wall of the steel ball frame, with slidably connected steel balls inside the through holes;

[0007] A through groove is provided inside the positioning shaft, and a driving mechanism is provided on the connecting plate. The output end of the driving mechanism passes through the through groove and is fixedly connected to the extrusion rod. When the extrusion rod moves upward, it is used to push multiple steel balls away from the center of the steel ball frame. A fixing shaft for fixing the workpiece is provided on the top of the connecting plate outside the positioning shaft.

[0008] Furthermore, the minimum diameter of the through hole is smaller than the diameter of the steel ball.

[0009] Furthermore, a slidingly connected push rod is provided in the through groove, one end of which is fixedly connected to the extrusion rod, and the other end of which is fixedly connected to the output end of the drive mechanism.

[0010] Furthermore, the driving mechanism includes a cylinder disposed at the bottom of the outer wall of the connecting plate, and the output end of the cylinder is fixedly connected to the push rod through a connecting block.

[0011] Furthermore, a fixing ring is provided on the top of the connecting plate outside the positioning shaft, and the fixing shaft is located on the top of the fixing ring.

[0012] Furthermore, a plurality of positioning blocks are evenly arranged on the top of the fixed shaft, and the positioning blocks are detachably connected to the fixed shaft.

[0013] Furthermore, the connecting plate is fixedly connected to the base via multiple connecting rods, and the base is provided with a handle on its top.

[0014] Furthermore, the base is provided with multiple positioning holes.

[0015] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0016] This internal expansion positioning mechanism uses a fixed shaft, a pressing rod, and steel balls to position the upper end of the workpiece and the fixed shaft to position the lower end of the workpiece. It positions the workpiece from the inside, occupies little space, and is convenient for use in narrow working spaces. When it is necessary to change the workpiece, simply move the pressing rod downward to remove the workpiece for replacement, ensuring workpiece replacement efficiency and thus ensuring welding processing efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of an internal expansion positioning mechanism according to an embodiment of the present utility model;

[0018] Figure 2 This is a three-dimensional structural diagram of an internal expansion positioning mechanism for fixing a workpiece according to an embodiment of the present utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the base provided according to an embodiment of the present utility model;

[0020] Figure 4 This is a three-dimensional structural schematic diagram of the steel ball frame provided according to an embodiment of the present utility model;

[0021] Figure 5 This is a front sectional view of the steel ball frame provided according to an embodiment of the present utility model;

[0022] Figure 6 This is a three-dimensional structural schematic diagram of a cylinder provided according to an embodiment of the present utility model;

[0023] Figure 7 This is a front cross-sectional view of the steel ball frame after removing the extrusion rod according to an embodiment of the present utility model;

[0024] Figure 8 This is a three-dimensional structural diagram of the fixing ring provided according to an embodiment of the present utility model.

[0025] In the diagram: 1. Base; 2. Connecting plate; 3. Positioning shaft; 4. Steel ball frame; 5. Cavity; 6. Extrusion rod; 7. Through hole; 8. Steel ball; 9. Top rod; 10. Fixed shaft; 11. Cylinder; 12. Connecting block; 13. Fixing ring; 14. Positioning block; 15. Connecting rod; 16. Handle; 17. Positioning hole. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0027] In the description of this utility model, 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 orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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 this utility model. 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, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figures 1-7As shown, this utility model provides an internal expansion positioning mechanism, including a base 1, a connecting plate 2 on the top of the base 1, a positioning shaft 3 on the top of the connecting plate 2, a steel ball frame 4 on the top of the positioning shaft 3, a cavity 5 inside the steel ball frame 4, a slidingly connected extrusion rod 6 inside the cavity 5, and multiple through holes 7 communicating with the cavity 5 on the outer wall of the steel ball frame 4, with steel balls 8 slidably connected inside the through holes 7; a through groove inside the positioning shaft 3, and a driving mechanism on the connecting plate 2, the output end of the driving mechanism passing through the through groove and fixedly connected to the extrusion rod 6; when the extrusion rod 6 moves upward, the extrusion rod 6 pushes the multiple steel balls 8 away from the center of the steel ball frame 4; and a fixing shaft 10 for fixing the workpiece is provided on the top of the connecting plate 2 outside the positioning shaft 3.

[0030] Specifically, the maximum diameter of the positioning shaft 3 and the steel ball holder 4 are the same, and the diameter of the workpiece is larger than the diameters of the positioning shaft 3 and the steel ball holder 4. When positioning a hollow tube workpiece is required, the workpiece is first simultaneously placed on the outside of the positioning shaft 3 and the steel ball holder 4, and the bottom end of the workpiece is placed on the outside of the fixed shaft 10. The minimum diameter of the workpiece is the same as the maximum diameter of the fixed shaft 10, thereby positioning one end of the workpiece through the fixed shaft 10. Then, the drive mechanism starts working, driving the extrusion rod 6 to move upward. The cavity 5 guides the extrusion rod 6, and the inclined surface at the top of the extrusion rod 6 contacts the steel balls 8. As the extrusion rod 6 moves upward, the inclined surface of the extrusion rod 6 pushes multiple steel balls 8 along the through hole 7. The steel ball 8 moves along the outside of the steel ball frame 4, causing it to extend slightly beyond the frame and contact the inner wall of the workpiece. Multiple steel balls 8 press against the inner wall of the workpiece, positioning it and ensuring coaxial alignment with the frame 4. At this point, the steel balls 8 position the upper end of the workpiece, while the fixed shaft 10 positions the lower end, thus completing the workpiece positioning within the frame. When a workpiece needs to be replaced, the drive mechanism moves the pressing rod 6 downwards. The pressing rod 6 no longer obstructs the steel balls 8, allowing them to move back into the frame 4. The workpiece can then be directly pulled out from above the positioning shaft 3 and the frame 4 for replacement, ensuring efficient workpiece replacement.

[0031] This utility model uses a fixed shaft 10, a pressing rod 6, and steel balls 8 in combination. Multiple steel balls 8 position the upper end of the workpiece, while the fixed shaft 10 positions the lower end of the workpiece. The workpiece is positioned from the inside, which takes up little space and is convenient for use in narrow working spaces. At the same time, when it is necessary to replace the workpiece, it is only necessary to move the pressing rod 6 downward to remove the workpiece for replacement, which ensures the efficiency of workpiece replacement and thus ensures the efficiency of welding processing.

[0032] In one embodiment, the minimum diameter of the through hole 7 is smaller than the diameter of the steel ball 8, ensuring that the steel ball 8 can partially extend out of the steel ball frame 4 while preventing the steel ball 8 from falling off the steel ball frame 4, thus ensuring the stability of the device structure.

[0033] like Figure 5 and Figure 6 As shown in one embodiment, a slidingly connected push rod 9 is provided in the through groove. One end of the push rod 9 is fixedly connected to the extrusion rod 6, and the other end of the push rod 9 is fixedly connected to the output end of the drive mechanism. The drive mechanism includes a cylinder 11 disposed at the bottom of the outer wall of the connecting plate 2. The output end of the cylinder 11 is fixedly connected to the push rod 9 through a connecting block 12.

[0034] Specifically, when it is necessary to raise or lower the extrusion rod 6, the cylinder 11 starts to work, and drives the push rod 9 to rise or fall through the connecting block 12. The push rod 9 drives the extrusion rod 6 to rise or fall, and the through groove plays a guiding role for the extrusion rod 6.

[0035] like Figure 8 As shown in one embodiment, the top of the connecting plate 2 is provided with a fixing ring 13 on the outside of the positioning shaft 3, and the fixing shaft 10 is disposed on the top of the fixing ring 13. A plurality of positioning blocks 14 are evenly arranged on the top of the fixing shaft 10, and the positioning blocks 14 are detachably connected to the fixing shaft 10.

[0036] Specifically, the fixing ring 13 supports the fixing shaft 10 and can be used to adjust the height of the fixing shaft 10 to accommodate workpieces of different heights. Multiple positioning blocks 14 cooperate to support and fix the bottom of the workpiece. At the same time, the support height of the positioning blocks 14 on the workpiece can be adjusted by replacing the positioning blocks 14, thus ensuring the applicability of this device.

[0037] like Figure 2 As shown in one embodiment, the connecting plate 2 is fixedly connected to the base 1 by a plurality of connecting rods 15, the base 1 is provided with a handle 16 on the top, and a plurality of positioning holes 17 are provided on the base 1.

[0038] In use, the base 1 of this device can be installed on the plate and the plate can be fixed to one side of the customer's on-site equipment. Optionally, washers are provided on both the upper and lower sides of the positioning hole 17 to protect the positioning hole 17. The handle 16 can be used to adjust the position of the base 1. Multiple connecting rods 15 are set between the base 1 and the connecting plate 2 to form a space for placing the cylinder 11. The base 1 is provided with a positioning sleeve for positioning with the plate.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An internal expansion positioning mechanism, characterized in that, Includes a base (1), the base (1) is provided with a connecting plate (2) on the top, the connecting plate (2) is provided with a positioning shaft (3) on the top, the positioning shaft (3) is provided with a steel ball frame (4) on the top, the steel ball frame (4) is provided with a cavity (5) inside, the cavity (5) is provided with a slidingly connected extrusion rod (6), the outer wall of the steel ball frame (4) is provided with a plurality of through holes (7) communicating with the cavity (5), and the through holes (7) are provided with slidingly connected steel balls (8); The positioning shaft (3) has a through groove, and the connecting plate (2) has a driving mechanism. The output end of the driving mechanism passes through the through groove and is fixedly connected to the extrusion rod (6). When the extrusion rod (6) moves upward, it pushes multiple steel balls (8) away from the center of the steel ball frame (4). The top of the connecting plate (2) is provided with a fixing shaft (10) for fixing the workpiece outside the positioning shaft (3).

2. The internal expansion positioning mechanism according to claim 1, characterized in that, The minimum diameter of the through hole (7) is smaller than the diameter of the steel ball (8).

3. The internal expansion positioning mechanism according to claim 1, characterized in that, The through groove is provided with a slidingly connected top rod (9), one end of which is fixedly connected to the extrusion rod (6), and the other end of which is fixedly connected to the output end of the drive mechanism.

4. The internal expansion positioning mechanism according to claim 3, characterized in that, The driving mechanism includes a cylinder (11) disposed at the bottom of the outer wall of the connecting plate (2), and the output end of the cylinder (11) is fixedly connected to the push rod (9) through the connecting block (12).

5. The internal expansion positioning mechanism according to claim 1, characterized in that, The top of the connecting plate (2) is provided with a fixing ring (13) on the outside of the positioning shaft (3), and the fixing shaft (10) is located on the top of the fixing ring (13).

6. The internal expansion positioning mechanism according to claim 5, characterized in that, The top of the fixed shaft (10) is provided with a plurality of positioning blocks (14), and the positioning blocks (14) are detachably connected to the fixed shaft (10).

7. The internal expansion positioning mechanism according to claim 1, characterized in that, The connecting plate (2) is fixedly connected to the base (1) by multiple connecting rods (15), and the base (1) is provided with a handle (16) on the top.

8. The internal expansion positioning mechanism according to claim 1, characterized in that, The base (1) has multiple positioning holes (17).

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