Diameter-variable limiting device

Abstract

The utility model provides a diameter-variable limiting device. The diameter-variable limiting device comprises a fixed disc, a rotary disc, a pushing mechanism, a locking mechanism and a plurality of fins, one end of the pushing mechanism is connected with the turntable, and the other end of the pushing mechanism is connected with the fins; the fins are located on the inner side of the fixing disc, are connected in a surrounding mode to form a circular shape and serve as a limiting disc abutting against the inner wall of the pipe fitting. The locking mechanism is located on the outer side of the rotary disc to lock the rotary disc. In the working process, the rotating disc rotates and pushes all the fins to move at the same time through the pushing mechanism, so that the radius of the limiting disc formed by the fins in a surrounding mode is adjustable. The diameter-variable limiting device disclosed by the utility model can be used as a gas shielded welding plugging device, is suitable for welding processing of pipe fittings with various pipe diameters, not only can greatly improve the universality and the practicability, but also can reduce the processing cost of butt welding of the pipe fittings.

Description

TECHNICAL FIELD

[0001] The utility model relates to a limiting device technical field, more specifically, relate to a variable diameter limiting device. BACKGROUND

[0002] When pipe fittings and pipe fittings butt welding, the joint is easy to be oxidized under the high temperature of welding, thereby affecting its mechanical properties and corrosion resistance. In order to avoid the oxidation of the joint between the two pipe fittings during welding, the pipe fittings after butt joint are usually closed from both ends by blocking plates, the blocking plates are connected together through the pipeline, then argon and other welding shielding gas are filled into the entire closed pipe cavity to exhaust the original air in the pipe, so that the argon and other welding shielding gas are filled in the cavity of the pipe after the air is exhausted, thereby preventing the oxidation of the joint.

[0003] In the entire plugging mechanism, the blocking plate plays an important role, which not only supports the air pipeline or fitting, but also forms an air chamber between the two blocking plates. However, the existing blocking plate has fixed size, which can only be used for single pipe diameter, that is, it can only be used as the blocking plate for two pipe fittings of one pipe diameter, and the blocking plate needs to be replaced for different pipe diameters, which not only leads to low universality and low practicability, but also greatly increases the cost of pipe fitting and pipe fitting butt welding processing. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the shortcomings and deficiencies in the prior art, and provides a variable diameter limiting device, which can be used as a gas shielded welding plugging device and is suitable for pipe fitting welding processing of various pipe diameters, can greatly improve the universality and practicability, and can reduce the processing cost of pipe fitting and pipe fitting butt welding.

[0005] In order to achieve the above purpose, the utility model realizes the technical scheme as follows: a variable diameter limiting device, characterized by comprising a fixed disc, a rotating disc, a pushing mechanism, a locking mechanism and a plurality of fins; one end of the pushing mechanism is connected with the rotating disc, and the other end is connected with the plurality of fins respectively; the plurality of fins are located on the inner side of the fixed disc, and the plurality of fins surround to form a circular shape and serve as a limiting disc abutting against the inner wall of the pipe fitting; the locking mechanism is located on the outer side of the rotating disc and realizes the locking of the rotating disc; when working, the rotating disc rotates and pushes each fin to move simultaneously through the pushing mechanism, so that the radius of the limiting disc surrounded by the fins can be adjusted.

[0006] In the above scheme, the radius-adjustable structure of the limiting disc makes the limiting device applicable to gas shield welding plugging devices in pipe welding processing of various pipe diameters, and the space between the two limiting devices can be used as a gas chamber for welding pipes. The limiting device does not need to be replaced according to the size of the pipe diameter of the welded pipe, and the radius of the limiting disc can be adjusted by directly rotating the turntable of the two limiting devices, so that the limiting disc abuts against the inner wall of the pipe with different pipe diameters, thereby achieving the plugging effect. In addition, when the limiting disc abuts against the inner wall of the pipe, the rotating disc can be locked by the locking mechanism, and the moving position of the fin is also locked. The operation is simple, which can greatly improve the versatility and practicality, and reduce the processing cost of pipe and pipe butt welding.

[0007] The fixed disc is provided with a support hole one, and the rotating disc is provided with a support hole two.

[0008] When the fixed disc and the rotating disc are respectively arranged on the pipeline or the accessory through the support hole one and the support hole two, the locking mechanism is located on the outer side of the rotating disc to lock the rotating disc. The support hole one and the support hole two of the utility model can support the installation of the pipeline, and the pipeline can be a gas inlet pipeline. The gas inlet pipeline can be filled with argon and other welding protection gases in the gas chamber between the two limiting devices to perform pipe welding.

[0009] The limiting device is also provided with a key; the support hole one is provided with a key groove, and the key is arranged in the key groove. The fixed disc is tightly connected with the pipeline through the key.

[0010] The pushing mechanism is a plurality of push rods; the number of the push rods is equal to the number of the fins; one end of the plurality of push rods is connected with the rotating disc, and the other end is respectively connected with the plurality of fins.

[0011] The inner side of the fixed disc is provided with a guide for the movement of each fin.

[0012] The guide is provided with a plurality of guide grooves, and the number of the guide grooves is equal to the number of the fins. Each fin is located in the corresponding guide groove. When working, the fin moves along the edge of the guide groove. The guide groove can realize the stability of the fin movement track.

[0013] Each fin includes a body and an abutting portion; the abutting portion is connected with the body; the plurality of fins form a circular shape by surrounding.

[0014] One end of the abutting portion of each fin is provided with a notch position, and the other end is provided with a protruding position. The protruding position is matched and connected with the notch position.

[0015] The butt joint of the adjacent fins refers to that each fin is butted with the notch position of one side adjacent fin through the protruding position and butted with the protruding position of the other side adjacent fin through the notch position, so that the butt joint of the adjacent fins is realized.

[0016] Compared with the prior art, the variable-diameter limiting device can be used as a gas shielded welding plugging device, is suitable for pipe joint welding processing of various pipe diameters, can greatly improve the universality and practicality, and can reduce the processing cost of pipe joint butt welding. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the variable-diameter limiting device of the utility model Figure 1 ;

[0018] Figure 2 is a schematic diagram of the variable-diameter limiting device of the utility model Figure 2 ;

[0019] Figure 3 is a schematic diagram of the variable-diameter limiting device of the utility model

[0020] Figure 4 is a schematic diagram of the variable-diameter limiting device of the utility model Figure 1 ;

[0021] Figure 2 is a schematic diagram of the variable-diameter limiting device of the utility model Figure 6 ;

[0022] Figures 1 to 6 is a schematic diagram of the variable-diameter limiting device of the utility model in pipe joint welding

[0023] Wherein, 1 is a fixed disc, 1.1 is a support hole one, 1.2 is a flat key groove, 2 is a rotating disc, 2.1 is a support hole two, 3 is a fin, 3.1 is a body, 3.2 is a notch position, 3.3 is a protruding position, 4 is a push rod, 5 is a pipe joint, 6 is a pipeline, 6.1 is an air outlet, 7 is a locking mechanism, 8 is a flat key, 9 is a guide piece, 9.1 is a guide groove. DETAILED DESCRIPTION

[0024] The utility model will be described in further detail in combination with the drawings and specific embodiments. EMBODIMENT

[0025] For example ​As shown, the variable-diameter limiting device comprises a fixed disc 1, a rotating disc 2, a pushing mechanism, a locking mechanism 7 and a plurality of fins 3, wherein the pushing mechanism is a plurality of push rods 4, the number of the push rods 4 is equal to the number of the fins 3, one end of the plurality of push rods 4 is connected with the rotating disc 2, and the other end is connected with the plurality of fins 3 respectively. The plurality of fins 3 is located at the inner side of the fixed disc 1, the plurality of fins 3 is surrounded to form a circular shape and serves as a limiting disc abutting against the inner wall of the pipe 5. The locking mechanism 7 is located at the outer side of the rotating disc 2 to lock the rotating disc 2; during operation, the rotating disc 2 rotates and pushes each fin 3 to move simultaneously through the push rod 4, so that the radius of the limiting disc surrounded by the fins 3 is adjustable.

[0026] Specifically, the fixed disc 1 is provided with a support hole one 1.1, and the rotating disc 2 is provided with a support hole two 2.1. The support hole one 1.1 and the support hole two 2.1 can support and install the pipeline 6 or the accessory, the pipeline 6 can be an air inlet pipeline provided with an air outlet hole 6.1, and the external argon or other protective gas can enter the air chamber between the two limiting devices through the air outlet hole 6.1 of the pipeline 6, so that the pipe 5 and the butt joint welding opening of the pipe 5 in the air chamber have the argon or other welding protective gas, thereby realizing welding. In addition, the locking mechanism 7 can adopt a nut, a fastener or the like, when the fixed disc 1 and the rotating disc 2 are respectively arranged on the pipeline 6 or the accessory through the support hole one 1.1 and the support hole two 2.1, the locking mechanism 7 is located at the outer side of the rotating disc 2 to lock the rotating disc 2.

[0027] In order to make the fixed disc 1 and the pipeline 6 closely connected, the limiting device further comprises a flat key 8, wherein the support hole one 1.1 is provided with a flat key groove 1.2, and the flat key 8 is arranged in the flat key groove 1.2.

[0028] The inner side of the fixed disc 1 is provided with a guide 9 facilitating the movement of each fin 3, the guide 9 is provided with a plurality of guide grooves 9.1, the number of the guide grooves 9.1 is equal to the number of the fins 3, and each fin 3 is located in a corresponding guide groove 9.1; during operation, the fin 3 moves along the edge of the guide groove 9.1. The guide groove 9.1 can realize the stability of the moving track of the fin 3.

[0029] Each fin 3 comprises a body 3.1 and a butt joint part, wherein the plurality of fins 3 is surrounded to form a circular shape, that is, one end of the butt joint part of each fin 3 is provided with a notch position 3.2, the other end is provided with a protruding position 3.3, the protruding position 3.3 is matched and butt jointed with the notch position 3.2; in the plurality of fins 3, each fin 3 is butt jointed with the notch position 3.2 of the adjacent fin 3 on one side through the protruding position 3.3, and is butt jointed with the protruding position 3.3 of the adjacent fin 3 on the other side through the notch position 3.2, so as to realize the butt joint of the butt joint parts of the adjacent fins 3, and the plurality of fins 3 is surrounded to form a circular shape.

[0030] The radius-adjustable structure of the limiting disc makes the limiting device applicable to the gas protection welding plugging device in the welding processing of pipe fittings 5 of various pipe diameters, and the space between the two limiting devices can be used as the air chamber of the welded pipe fitting 5. The limiting device does not need to be replaced according to the pipe diameter of the welded pipe fitting 5, and the radius of the limiting disc can be adjusted by directly rotating the turntable 2 of the two limiting devices, so that the limiting disc abuts against the inner wall of the pipe fitting 5 of different pipe diameters, and the plugging effect is achieved. In addition, when the limiting disc abuts against the inner wall of the pipe fitting 5, the turntable 2 can be locked by the locking mechanism 7, and the moving position of the fin 3 is also locked. The operation is simple, which can greatly improve the universality and practicality, and can reduce the processing cost of the pipe fitting 5 and the butt welding of the pipe fitting 5.

[0031] The above embodiment is a preferred embodiment of the utility model, but the embodiment of the utility model is not limited by the above embodiment, and any change, modification, replacement, combination, simplification, which does not deviate from the spirit and principle of the utility model, should be an equivalent replacement method, and all are included in the protection scope of the utility model.

Claims

1. A variable diameter stop comprising: The application relates to a limiting device for a pipe or a fitting, which comprises a fixed disc, a rotating disc, a pushing mechanism, a locking mechanism and a plurality of fins, wherein one end of the pushing mechanism is connected with the rotating disc, the other end is connected with the plurality of fins respectively, the plurality of fins are located at the inner side of the fixed disc, the plurality of fins are arranged in a circular shape and serve as a limiting disc abutting against the inner wall of the pipe, the locking mechanism is located at the outer side of the rotating disc and is used for locking the rotating disc, and the radius of the limiting disc formed by the fins can be adjusted when the rotating disc rotates and pushes each fin to move simultaneously.

2. The variable-gauge stop of claim 1, wherein: The fixed disc is provided with a supporting hole one, and the rotating disc is provided with a supporting hole two.

3. The variable-gage spacer of claim 2, wherein: When the fixed disc and the rotating disc are arranged on the pipe or the fitting through the supporting hole one and the supporting hole two respectively, the locking mechanism is located at the outer side of the rotating disc and is used for locking the rotating disc.

4. The variable diameter stop of claim 2, wherein: The limiting device is also provided with a flat key, the supporting hole one is provided with a flat key groove, and the flat key is arranged in the flat key groove.

5. The variable-gage spacer of claim 1, wherein: The pushing mechanism is a plurality of pushing rods, the number of the pushing rods is equal to the number of the fins, one end of each pushing rod is connected with the rotating disc, and the other end is connected with each fin respectively.

6. The variable-gage spacer of claim 1, wherein: The inner side of the fixed disc is provided with a guide part for facilitating the movement of each fin.

7. The variable-gage spacer of claim 6, wherein: The guide part is provided with a plurality of guide grooves, the number of the guide grooves is equal to the number of the fins, and each fin is located in a corresponding guide groove; and when working, the fins move along the edges of the guide grooves.

8. The variable-gage spacer of claim 1, wherein: Each fin comprises a body and a butt joint part, the butt joint part is connected with the body, and the plurality of fins are arranged in a circular shape by means of butt joint of the butt joint parts of adjacent fins.

9. The variable-gage spacer of claim 8, wherein: One end of the butt joint part of each fin is provided with a notch position, and the other end is provided with a convex position, the convex position is matched with the notch position and is butted.

10. The variable-gauge stop of claim 9, wherein: The butt joint of the butt joint parts of the adjacent fins means that each fin is butted with the notch position of one side adjacent fin through the convex position and is butted with the convex position of the other side adjacent fin through the notch position, so that the butt joint parts of the adjacent fins are butted.

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