Shrinkage and expansion adjustable mold structure of pipe expander

Abstract

The utility model discloses a contraction and expansion adjustable mold structure of a pipe expander, relates to the technical field of pipe expanders, and aims to solve the technical problem that a step type pipe orifice is inconvenient to manufacture due to the fact that the size of a pipe expander is fixed. The contraction and expansion adjustable mold structure comprises a pipe expander main body, and a shell above the pipe expander main body is connected with a control rod through a fixing plate; and one end of the control rod is fixedly connected with a front pipe expander. The control rod is controlled to drive the front pipe expander and the expansion pipe expander to advance so as to expand a pipeline, firstly, the front pipe expander carries out preliminary pipe expansion on the pipeline, then when the control rod drives the expansion pipe expander to continuously move after the connecting ring is in contact with the fixing plate, the sliding block drives the pull rod to pull one end of the top plate, and then the pipeline is expanded. And the supporting plate is forced to be lifted up, so that the size of the expansion pipe expander is expanded, then when the expansion pipe expander is continuously driven by the control rod to push and rotate, secondary pipe expansion treatment is carried out on a pipeline preliminarily machined by the front pipe expander to form a step pipe opening, and the trouble of replacing the pipe expander is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of tube expanders, and more specifically to a mold structure of a tube expander with adjustable shrinkage and expansion. Background Art

[0002] The tube expander is a special hydraulic expansion device used for the expansion connection of heat exchange tubes and tube sheets in the manufacturing of equipment such as heat exchangers, condensers, high-pressure heaters, steam turbines, boilers, etc. The use of hydraulic expansion technology has the advantages of low manufacturing cost, light labor intensity, short manufacturing cycle, uniform and reliable expansion quality, etc. During the tube expansion process, the tube expander is generally controlled to move forward and rotate to achieve the expansion of the pipeline orifice.

[0003] When expanding a pipe that requires a stepped pipe opening, it is necessary to replace expanders of different diameters, with the small diameter expander first and the large diameter expander later, to achieve a stepped pipe opening of the pipe. The replacement of the expander requires interrupting the expansion operation, which prolongs the time required for the expander to expand the pipe. In view of this, we propose a mold structure of the expander with adjustable shrinkage and expansion. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art, meet practical needs, and provide a mold structure of a tube expander with adjustable shrinkage and expansion to solve the technical problem that the current tube expander size is not convenient for manufacturing stepped tube openings.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a mold structure of a tube expander with adjustable shrinkage and expansion, comprising a tube expander body, a shell above the tube expander body is connected to a control rod through a fixing plate, one end of the control rod is fixedly connected to a front tube expander, one side of the front tube expander is provided with an expansion tube expander, the outer surface of the control rod is provided with a connecting ring, and the lower surface of the expansion tube expander is connected to the connecting rod through a connecting plate;

[0006] The connecting plate includes a top plate, a support plate and a positioning plate which are movably connected to each other through a movable shaft. The positioning plate is movably connected to a fixed shaft and a connecting rod. The top plate is movably connected to a connecting block through a connecting shaft. A pull rod is fixedly connected to the front surface of the connecting block. Both sides of the outer surface of the connecting block are movably connected to sliding rods through shafts. A number of sliding blocks are evenly arranged inside the connecting ring, and a return spring is connected to one side of the sliding block.

[0007] The utility model controls the control rod to drive the front tube expander and the expansion tube expander forward to expand the tube of the pipeline. First, the front tube expander performs preliminary tube expansion on the pipeline. Then, after the connecting ring contacts the fixed plate, the control rod drives the expansion tube expander to continue to move. The slider drives the pull rod to pull one end of the top plate and forces the support plate to rise so that the size of the expansion tube expander is enlarged. Then, while the control rod continues to drive the expansion tube expander to advance and rotate, the pipeline preliminarily processed by the front tube expander is subjected to secondary tube expansion. This makes the size of the tube expander adjustable and avoids the trouble of replacing the tube expander.

[0008] Preferably, a connecting block and movable grooves for the sliding rod and the pulling rod are respectively opened inside the connecting rod, and one end of the pulling rod is fixedly connected to the sliding block; through the connection between the sliding block and the pulling rod, the lifting of the middle support plate of the connecting plate is further controlled.

[0009] Preferably, a side edge of the expansion tube expander is provided with a bevel protrusion; and burrs generated by the contact between the edge of the pipeline and the tube expander are processed.

[0010] Preferably, a protrusion is fixedly connected to the outer surface of the pull rod, a groove matching the protrusion is provided on the lower surface of the support plate, and a slide groove matching the protrusion is provided on the outer surface of the connecting rod; when the pull rod is pulled, the protrusion is driven to move in the groove on the lower surface of the support plate, slightly lifting the support plate so that it has a tendency to move upward, thereby facilitating the unfolding of the expansion tube expander.

[0011] Preferably, a moving groove for a slider is provided on the outer surface of the control rod, and one end of a return spring is connected to the inner wall of the moving groove; through the connection between the pull rod and the slider, after the movement of the connecting ring is restricted, the connecting plate is pulled to lift its middle part.

[0012] Preferably, one end of the pull rod passes through the control rod and is located in the moving groove of the slider, thereby maintaining the connection between the expansion tube expander and the connecting ring.

[0013] Preferably, the expansion tube expander is fixedly connected to the support plate; the lifting of the expansion tube expander is controlled by the support plate, so as to facilitate the adjustment of the use size of the expansion tube expander.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model controls the control rod to drive the front tube expander and the expansion tube expander forward to expand the pipeline. First, the front tube expander performs preliminary tube expansion on the pipeline. Then, after the connecting ring contacts the fixed plate, the control rod drives the expansion tube expander to move continuously. The slider drives the pull rod to pull one end of the top plate, and forces the support plate to lift so that the size of the expansion tube expander is expanded. Then, the control rod continues to drive the expansion tube expander to advance and rotate, and the pipeline preliminarily processed by the front tube expander is subjected to secondary tube expansion. The size of the tube expander is adjustable, avoiding the trouble of replacing the tube expander.

[0016] 2. The utility model also achieves the effect of processing the burrs generated by the contact between the edge of the pipeline and the expander by designing a convex structure of the inclined surface on one side of the expansion tube expander, further solving the problem of burrs generated on the edge of the pipeline after the tube is expanded. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the support plate structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the connecting plate structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the side cross-sectional structure of the connecting rod of the utility model;

[0021] Figure 5 For the utility model Figure 4 -Schematic diagram of the structure at A;

[0022] Figure 6 The utility model is a schematic diagram of a use state.

[0023] Description of the numbers in the figure:

[0024] 1. Expander body; 2. Control rod; 201. Connecting rod; 3. Front expander; 4. Expansion expander; 5. Fixing plate;

[0025] 6. Connecting ring; 601. Sliding block; 602. Return spring; 7. Connecting plate; 701. Top plate; 702. Support plate; 703. Positioning plate; 8. Pull rod; 801. Bump; 802. Slide groove; 9. Movable shaft; 10. Fixed shaft; 11. Connecting block; 12. Sliding rod; 13. Connecting shaft. DETAILED DESCRIPTION

[0026] like Figures 1 to 6As shown, the utility model relates to a mold structure with adjustable shrinkage and expansion of a tube expander, comprising a tube expander body 1, a shell body above the tube expander body 1 is connected to a control rod 2 through a fixed plate 5, one end of the control rod 2 is fixedly connected to a front tube expander 3, one side of the front tube expander 3 is provided with an expansion tube expander 4, a connecting ring 6 is provided on the outer surface of the control rod 2, and the lower surface of the expansion tube expander 4 is connected to a connecting rod 201 through a connecting plate 7; the connecting plate 7 comprises a top plate 701, a support plate 702 and a positioning plate 703 adjacently connected to each other through a movable shaft 9, the positioning plate 703 is movably connected to the connecting rod 201 through a fixed shaft 10, the top plate 701 is movably connected to a connecting block 11 through a connecting shaft 13, a pull rod 8 is fixedly connected to the front surface of the connecting block 11, both sides of the outer surface of the connecting block 11 are movably connected to slide rods 12 through shafts, a plurality of sliders 601 are evenly arranged inside the connecting ring 6, and a reset spring 602 is connected to one side of the slider 601.

[0027] In an embodiment of the utility model, a connecting block 11 and movable grooves of the sliding rod 12 and the pull rod 8 are respectively provided inside the connecting rod 201, one end of the pull rod 8 is fixedly connected to the slider 601, a movable groove of the slider 601 is provided on the outer surface of the control rod 2, and one end of the return spring 602 is connected to the inner wall of the movable groove, one end of the pull rod 8 passes through the control rod 2 and is located in the movable groove of the slider 601, and the expander 4 is fixedly connected to the support plate 702.

[0028] In the embodiment of the present utility model, a side edge of the expansion tube expander 4 is provided with an inclined protrusion.

[0029] As another embodiment of the utility model, a protrusion 801 is fixedly connected to the outer surface of the pull rod 8, a groove matching the protrusion 801 is formed on the lower surface of the support plate 702, and a sliding groove 802 matching the protrusion 801 is formed on the outer surface of the connecting rod 201.

[0030] Working principle: This embodiment provides a mold structure with adjustable shrinkage and expansion of a tube expander. When expanding a pipeline that requires a stepped tube mouth, first rotate the forward push control rod 2 to control the front tube expander 3 to contact the tube mouth, and perform preliminary tube expansion on the tube mouth under the action of the front tube expander 3. When the control rod 2 is continuously pushed forward and the front tube expander 3 is expanding the tube mouth, the fixed plate 5 prevents the movement of the connecting ring 6, and causes the connecting ring 6 to apply a pulling force on the connecting block 11 through the slider 601 and the pull rod 8. Under the action of the protrusion 801, the support plate 702 has a tendency to move upward, and the top plate 701 is further controlled to lift the support plate 702, so that the expansion expander 4 on the outside of the connecting rod 201 is opened to expand the expansion size, and then the tube mouth is subjected to secondary tube expansion by the expansion expander 4 with the enlarged size during the continued advancement of the control rod 2, so as to realize the expansion of the stepped tube mouth and avoid the trouble of replacing the tube expander.

[0031] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A mold structure with adjustable shrinkage and expansion of a tube expander, comprising a tube expander body (1), characterized in that: The upper shell of the tube expander body (1) is connected to a control rod (2) via a fixing plate (5); one end of the control rod (2) is fixedly connected to a front tube expander (3); one side of the front tube expander (3) is provided with an expansion tube expander (4); the outer surface of the control rod (2) is provided with a connecting ring (6); the lower surface of the expansion tube expander (4) is connected to a connecting rod (201) via a connecting plate (7); The connecting plate (7) comprises a top plate (701), a support plate (702) and a positioning plate (703) which are adjacently movably connected via a movable shaft (9); the positioning plate (703) is movably connected via a fixed shaft (10) and a connecting rod (201); the top plate (701) is movably connected to a connecting block (11) via a connecting shaft (13); a pull rod (8) is fixedly connected to the front surface of the connecting block (11); both sides of the outer surface of the connecting block (11) are movably connected to sliding rods (12) via shafts; a plurality of sliding blocks (601) are evenly arranged inside the connecting ring (6); a return spring (602) is connected to one side of the sliding block (601).

2. The mold structure with adjustable shrinkage and expansion of the tube expander according to claim 1 is characterized in that: The connecting rod (201) is provided with a connecting block (11) and movable grooves for the sliding rod (12) and the pulling rod (8) respectively, and one end of the pulling rod (8) is fixedly connected to the sliding block (601).

3. The shrinkage and expansion adjustable mold structure of the tube expander according to claim 1 is characterized in that: A sloped protrusion is provided on one side edge of the expansion tube expander (4).

4. The shrinkage and expansion adjustable mold structure of the tube expander according to claim 1 is characterized in that: The outer surface of the pull rod (8) is fixedly connected with a protrusion (801), the lower surface of the support plate (702) is provided with a slot matching the protrusion (801), and the outer surface of the connecting rod (201) is provided with a sliding groove (802) matching the protrusion (801).

5. The shrinkage and expansion adjustable mold structure of the tube expander according to claim 1 is characterized in that: The outer surface of the control rod (2) is provided with a moving groove for the slider (601), and one end of the return spring (602) is connected to the inner wall of the moving groove.

6. The shrinkage and expansion adjustable mold structure of the tube expander according to claim 1, characterized in that: One end of the pull rod (8) passes through the control rod (2) and is located in the moving groove of the slider (601).

7. The shrinkage and expansion adjustable mold structure of the tube expander according to claim 1 is characterized in that: The expansion tube expander (4) is fixedly connected to the support plate (702).

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