High-efficiency pipe expander

Abstract

The utility model discloses a high-efficiency pipe expander, which belongs to the technical field of electric hot melting installation of composite plastic pipelines and comprises an expansion ring. The outer diameter of the expansion ring is the same as the inner diameter of the pipeline; a supporting plate is fixedly mounted on the inner wall of the expansion ring; the lower end of the expansion ring is provided with a notch; connecting lug plates are symmetrically and fixedly installed at the two ends of the expansion ring, and connecting shafts are arranged at the ends of the connecting lug plates in a penetrating mode. The connecting shafts on the two sides are hinged to bolts at the two ends of the turn buckle; by means of the mode, at the beginning, the turn buckle is rotated to enable the expansion ring to deform, the two ends of the gap of the expansion ring make contact, the expansion ring can be fed into the pipeline, after the expansion ring is moved to the set position, the turn buckle is rotated to enable the expansion ring to be opened till the outer edge of the expansion ring supports the inner wall of the pipeline, operation is convenient, and pipe expansion efficiency is high; when a pipeline connector is installed, contact gaps of the inner wall are even in the hot melting process, the percent of pass of installation and electric fusion welding of a welded junction is effectively improved, and therefore waste of materials is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrofusion installation of composite plastic pipes, and particularly relates to a high-efficiency pipe expander. Background Art

[0002] During the stacking and transportation of composite plastic pipes, the pipe orifices are deformed, and the ovality fails to meet the specification requirements, resulting in uneven inner wall contact gaps and excessive local gaps during the hot melt process of the pipe installation interface. It is impossible to ensure the installation on site, the qualified rate of the electrofusion welding joints cannot be guaranteed, the pipe hydraulic test cannot be ensured, rework is extremely easy, and only the whole pipe can be replaced when the weld leaks, resulting in serious waste of materials.

[0003] Chinese Patent CN208074391U discloses a hydraulic pipe expander, which includes a support rod, eight groups of hydraulic link mechanisms and four support sleeves. An intermediate sleeve is arranged in the middle of the support rod, fixing rings are arranged at both ends of the support rod, each fixing ring is connected with four groups of hydraulic connection mechanisms, and the positions of the hydraulic link mechanisms on the two fixing rings correspond to each other. A support sleeve is sleeved outside the two output ends of each group of two relatively positioned hydraulic link mechanisms. The inner support effect on the pipe can be realized by putting the pipe expander into the pipe; however, this pipe expander supports multiple points on the inner wall of the pipe through arc supports. For composite plastic corrugated pipes, the inner wall of the pipe may be damaged due to the large inner support force at local points.

[0004] Based on this, the utility model provides a high-efficiency pipe expander to solve the above problems. Content of the Utility Model

[0005] Aiming at the above-mentioned defects of the prior art, the utility model provides a high-efficiency pipe expander.

[0006] To achieve the above purposes, the utility model is realized through the following technical solutions:

[0007] A high-efficiency pipe expander includes an expansion ring;

[0008] A support plate is fixedly installed on the inner wall of the expansion ring;

[0009] A notch is provided at the lower end of the expansion ring;

[0010] Connection components are symmetrically and fixedly installed at both ends of the expansion ring, and an expansion component for controlling the expansion or contraction of the expansion ring is arranged between the connection components on both sides.

[0011] Furthermore, the connection component includes a connection ear plate and a connection shaft. The connection ear plate is fixedly connected with the expansion ring, and a connection shaft is fixedly installed at the end of the connection ear plate.

[0012] Furthermore, the expansion component adopts a turnbuckle, and the connecting shafts on both sides are hinged to the bolts at both ends of the turnbuckle.

[0013] Furthermore, the outer diameter of the expansion ring is the same as the inner diameter of the pipeline.

[0014] Furthermore, the expansion ring is formed by rolling flat steel with a rolling machine.

[0015] Furthermore, the expansion ring is composed of two semi-circular arc plates with the same diameter. One end of the two semi-circular arc plates is fixed by welding with a fixing plate, and the other ends of the two semi-circular arc plates are not connected to form a notch.

[0016] Furthermore, the expansion ring, the support plate, the connecting ear plate and the fixing plate are all made of Q235B steel.

[0017] Furthermore, the support plate, the connecting ear plate and the fixing plate are all made of mm steel.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] In the present utility model, initially, the turnbuckle is rotated to cause the expansion ring to deform, and the two ends at the notch of the expansion ring come into contact, so that the expansion ring can be fed into the pipeline. When the expansion ring is moved to the set position, the turnbuckle is rotated to open the expansion ring until the outer edge of the expansion ring supports against the inner wall of the pipeline. This not only has convenient operation and high pipe expansion efficiency, but also the inner wall of the pipeline is evenly stressed and not easily damaged. Therefore, when installing the pipeline interface, the contact gap between the inner walls is uniform during the hot melting process, effectively improving the qualification rate of the installation and the electrofusion welding joint, and thus reducing the waste of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0021] Figure 1 It is the front view of a high-efficiency pipe expander of the present utility model;

[0022] Figure 2 For along Figure 1 Sectional view in the A-A direction Figure 1 ;

[0023] Figure 3 For along Figure 1 Sectional view in the A-A direction Figure 2 .

[0024] The reference numerals in the figures respectively represent:

[0025] 1. Expansion ring; 2. Support plate; 3. Turnbuckle; 4. Connecting ear plate; 5. Connecting shaft; 6. Notch; 7. Fixed plate. Specific implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] The "left", "right", "front", "rear", "upper" and "lower" mentioned in the following description are oriented in the perspective direction of the front view.

[0028] Embodiment 1

[0029] In some embodiments, please refer to the accompanying drawings of the specification Figures 1-3 , a high-efficiency tube expander, including an expansion ring 1;

[0030] The expansion ring 1 is formed by rolling flat steel with a rolling machine. The outer diameter of the expansion ring 1 is the same as the inner diameter of the pipeline, so that the outer wall of the expansion ring 1 fits the inner wall of the pipeline;

[0031] A support plate 2 is fixedly installed on the inner wall of the expansion ring 1 to increase the strength of the expansion ring 1 and reduce the deformation of the expansion ring 1;

[0032] A notch 6 is provided at the lower end of the expansion ring 1. When the expansion ring 1 deforms so that the two ends of the notch 6 come into contact, the expansion ring 1 is smaller than the inner diameter of the pipeline, so that the expansion ring 1 can be easily inserted into the pipeline;

[0033] Connecting ear plates 4 are symmetrically and fixedly installed at both ends of the expansion ring 1, and a connecting shaft 5 is passed through the end of the connecting ear plate 4; the connecting shaft 5 is fixed on the connecting ear plate 4 by the cooperation of the thread and the nut at its end;

[0034] The connecting shafts 5 on both sides are hinged to the bolts at both ends of the turnbuckle 3;

[0035] Preferably, the expansion ring 1 is composed of two semi-circular arc plates with the same diameter. One end of the two semi-circular arc plates is fixedly welded by a fixed plate 7, and the other ends of the two semi-circular arc plates are not connected to form a notch 6;

[0036] The expansion ring 1, the support plate 2, the connecting ear plate 4 and the fixed plate 7 are all made of Q235B steel.

[0037] In the present utility model, initially, the turnbuckle 3 is rotated to cause the expansion ring 1 to deform. The two ends at the notch of the expansion ring 1 come into contact, enabling the expansion ring 1 to be inserted into the interior of the pipeline. After the expansion ring 1 is moved to the set position, the turnbuckle 3 is rotated to open the expansion ring 1 until the outer edge of the expansion ring 1 supports against the inner wall of the pipeline. This not only facilitates the operation and has a high pipe expansion efficiency, but also ensures that the inner wall of the pipeline is evenly stressed and not easily damaged. Therefore, when installing the pipeline joint, during the hot melt process, the contact gap between the inner walls is uniform, effectively improving the qualification rate of the installation and the electrofusion welding joint, and thus reducing the waste of materials.

[0038] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the present utility model in each embodiment.

Claims

1. A high-efficiency tube expander, comprising an expansion ring (1), characterized in that: A support plate (2) is fixedly installed on the inner wall of the expansion ring (1); A notch (6) is provided at the lower end of the expansion ring (1); Connecting components are symmetrically and fixedly installed at both ends of the expansion ring (1), and an expansion component for controlling the expansion or contraction of the expansion ring (1) is arranged between the connecting components on both sides.

2. The high-efficiency tube expander according to claim 1, wherein The connecting component includes a connecting ear plate (4) and a connecting shaft (5). The connecting ear plate (4) is fixedly connected to the expansion ring (1), and a connecting shaft (5) is fixedly installed at the end of the connecting ear plate (4).

3. The high-efficiency tube expander according to claim 2, wherein The expansion component uses a turnbuckle (3), and the connecting shafts (5) on both sides are hinged to the bolts at both ends of the turnbuckle (3).

4. The high-efficiency tube expander according to claim 3, wherein, The outer diameter of the expansion ring (1) is the same as the inner diameter of the pipe.

5. The high-efficiency tube expander according to claim 4, characterized in that, The expansion ring (1) is formed by rolling a flat steel plate with a rolling machine.

6. The high-efficiency tube expander according to claim 5, characterized in that, The expansion ring (1) is composed of two semi-circular arc plates with the same diameter. One end of the two semi-circular arc plates is fixedly welded through a fixing plate (7), and the other ends of the two semi-circular arc plates are not connected to form a notch (6).

7. The high-efficiency tube expander according to claim 6, characterized in that, The expansion ring (1), the support plate (2), the connecting ear plate (4) and the fixing plate (7) are all made of Q235B steel.

8. The high-efficiency tube expander according to claim 7, wherein, The support plate (2), the connecting ear plate (4) and the fixing plate (7) are all made of 12mm steel.

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