Steel pipe end expanding mechanism
By designing a steel pipe end expansion mechanism including a rod body, impact block and multiple arc-shaped expansion sheets, the problems of high manufacturing cost and inconvenient operation of the steel pipe end expansion mechanism in the prior art are solved, and the steel pipe end expansion and repair effect with simple structure, low cost and easy operation are achieved.
Patent Information
- Application Number
- CN202420269664.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-04
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-02-04
AI Technical Summary
The existing steel pipe end expansion mechanism has high manufacturing cost and is inconvenient to operate. Especially when the head and the steel pipe end are too tight, it cannot be pulled out smoothly. It needs to be inserted into the strip from the other end and exited with the hydraulic press, which is complicated to operate.
A steel pipe end expansion mechanism including a rod body, a slidingly connected impact block and an expander disposed at the front end of the rod body is designed. The dilator is composed of a multi-arced expansion piece, which is maintained by an elastic ring. The front end of the rod body has a conical guide part, and the dilator sleeve is placed on the guide part, and the impact block hits the convex ring, so that the guide part is pushed into the steel pipe, and the dilator expands or repairs the end of the steel pipe.
The steel pipe end expansion mechanism with simple structure, low manufacturing cost and easy operation is realized. It is suitable for both the expansion of the steel pipe end and the repair of the deformed steel pipe end.
Smart Images
Figure CN222569041U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a steel pipe end expansion mechanism. Background Art
[0002] The end of the steel pipe needs to be expanded or repaired due to installation and connection requirements or deformation. In the prior art, a hydraulic expansion method is generally used. Specifically, a ram is installed at the end of the piston rod of the hydraulic press, and the piston rod drives the ram to push into the end of the steel pipe, so that the end of the steel pipe is expanded or pushed back to its original shape by the ram. The expansion mechanism of this structure has a relatively high manufacturing cost, and once the ram is too tightly combined with the end of the steel pipe, the ram cannot be pulled out smoothly when the piston rod of the hydraulic press retracts. It is necessary to insert a cleaning rod from the other end of the steel pipe to cooperate with the hydraulic press to withdraw the ram, and the operation is not convenient enough. Utility Model Content
[0003] The utility model aims to overcome the above-mentioned deficiencies of the prior art and provide a steel pipe end expansion mechanism which has a simple structure, low manufacturing cost and convenient operation.
[0004] The technical solution of the utility model is: a steel pipe end expansion mechanism, comprising a rod body, a collision block slidably connected to the rod body, and an expander arranged at the front end of the rod body;
[0005] The expander is composed of a plurality of arc-shaped expansion pieces, each of which forms a cylinder with a frustum-shaped inner hole, and each of which has a slot on the outer side of the rear end, and an elastic ring is inserted into the concave ring formed by the slots, so that each of the expansion pieces remains connected in the shape of a cylinder;
[0006] The front end of the rod body is provided with a frustoconical guide portion, the expander sleeve is placed on the guide portion, and a convex ring is provided between the rod body and the guide portion.
[0007] Preferably, the expander consists of three expansion sheets.
[0008] Furthermore, the rear end of each expansion piece also has a fan-shaped protrusion protruding outward, the card slot is arranged on the outside of the fan-shaped protrusion, and the fan-shaped protrusions of each expansion piece are connected to form a limit platform.
[0009] Specifically, the length of the guide portion is greater than the length of the dilator.
[0010] Furthermore, a front limiting boss is provided at the front end of the guide portion.
[0011] Furthermore, the front end of the guide portion has a threaded section, a first nut is screwed onto the threaded section, and the first nut forms a front limit platform.
[0012] Specifically, the convex ring is welded between the rod body and the guide portion.
[0013] Furthermore, a second slot is provided in the middle of each expansion piece for receiving another elastic ring.
[0014] Furthermore, a second nut is screwed onto the rear end of the rod body, and the second nut forms a rear limiting boss.
[0015] Optionally, the impact block is a manual impact block or an automatic impact block.
[0016] The beneficial effects of the utility model are as follows: the utility model has a simple structure, low manufacturing cost, and convenient operation, and is suitable for both expanding the end of a steel pipe and repairing the deformed end of a steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the utility model;
[0018] Figure 2 It is a schematic diagram of the state of the utility model when it is working;
[0019] Figure 3 It is a structural schematic diagram of the expander in the utility model;
[0020] Figure 4 It is a structural schematic diagram of the expansion piece in the utility model.
[0021] In the figure: rod body 1, impact block 2, expander 3, expansion sheet 4, slot 5, elastic ring 6, guide part 7, convex ring 8, steel pipe 9, fan-shaped convex block 10, front limit boss 11, second slot 12, rear limit boss 13. DETAILED DESCRIPTION
[0022] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.
[0023] Combination Figure 1-4 As shown, a steel pipe end expansion mechanism comprises a rod body 1, an impact block 2 slidably connected to the rod body 1, and an expander 3 arranged at the front end of the rod body 1;
[0024] The expander 3 is composed of a plurality of arc-shaped expansion pieces 4, each of which forms a cylinder with a frustum-shaped inner hole. The rear end of each expansion piece 4 is also provided with a slot 5. An elastic ring 6 is inserted into the concave ring formed by the slots 5, so that each expansion piece 4 remains connected in the shape of a cylinder.
[0025] The front end of the rod body 1 has a frustoconical guide portion 7, and the expander 3 is placed on the guide portion 7. A convex ring 8 is provided between the rod body 1 and the guide portion 7. The convex ring 8, on the one hand, serves to limit the rear end of the expander 3, and on the other hand, is used to receive the impact of the impact block 2 so as to push the guide portion 7 into the end of the steel pipe 9 and open the expander 3.
[0026] The working principle of the above structure is: first fix the steel pipe 9 to be expanded (repaired), and then insert the guide part 7 together with the front end of the expander 3 into the end of the steel pipe 9. At this time, the expander 3 is located at the front end of the guide part 7 and is in an unopened state; the impact block 2 moves back and forth along the rod body 1 and hits the convex ring 8. Under the action of the impact block 2, the guide part 7 is pushed toward the inside of the steel pipe 9. Due to the cone-shaped structure of the guide part 7, each expansion piece 4 of the expander 3 is stuck between the guide part 7 and the inner wall of the end of the steel pipe 9. The entire expander 3 opens as the guide part 7 goes deeper, thereby expanding (repairing) the end of the steel pipe 9; after the expansion (repair) is completed, pull the rod body 1 backward, and as the guide part 7 retreats, the expander 3 is reset and withdrawn from the end of the steel pipe 9.
[0027] The beneficial effects of the above structure are: simple structure, low manufacturing cost, easy operation, and it is suitable for both expanding the end of the steel pipe 9 and repairing the deformed end of the steel pipe 9.
[0028] Preferably, the expander 3 is composed of three expansion sheets 4 .
[0029] In another embodiment, in combination Figure 1-4 As shown, the rear end of each expansion piece 4 also has a fan-shaped protrusion 10 protruding outward, and the slot 5 is arranged on the outside of the fan-shaped protrusion 10. The fan-shaped protrusions 10 of each expansion piece 4 are connected to form a limit platform, and the limit platform mainly serves to prevent the expander 3 from being pushed into the steel pipe 9 too deeply and unable to be pulled out.
[0030] In another embodiment, if Figure 1 and Figure 2 As shown, the length of the guide portion 7 is greater than the length of the dilator 3 .
[0031] In another embodiment, Figure 1 As shown, the front end of the guide part 7 is also provided with a front limit boss 11. After the end of the steel pipe 9 is expanded, the rod body 1 is pulled out backward. As the guide part 7 retreats, the expander 3 is reset under the action of the elastic ring 6, and its end abuts against the front limit platform and is pulled out of the end of the steel pipe 9 along with the front limit platform.
[0032] Specifically, the front end of the guide portion 7 has a threaded section, a first nut is screwed onto the threaded section, and the first nut forms a front limit platform.
[0033] Specifically, the convex ring 8 is welded between the rod body 1 and the guide portion 7 .
[0034] In another embodiment, if Figure 4 As shown, a second slot 12 is further provided in the middle of each expansion piece 4 for inserting another elastic ring, so that the expander 3 is less likely to fall off the guide portion 7 and the resetting of the expander 3 after expansion is more stable.
[0035] In another embodiment, if Figure 1 and Figure 2 As shown, a second nut is screwed to the rear end of the rod body 1 , and the second nut forms a rear limiting boss 13 to facilitate the disassembly and assembly of the impact block 2 .
[0036] In another embodiment, the impact block 2 is a manual impact block or an automatic impact block. When the impact block 2 is an electric impact block, a cylinder is also fixed to the rear end of the rod body 1, and the piston rod of the cylinder is connected to the impact block 2. When the impact block 2 is a manual impact block, the operator holds the rod body 1 with one hand and pushes the impact block 2 to impact the convex ring 8 with the other hand.
Claims
1. A steel pipe end expansion mechanism, characterized in that: It comprises a rod body (1), an impact block (2) slidably connected to the rod body (1), and an expander (3) arranged at the front end of the rod body (1); The expander (3) is composed of a plurality of arc-shaped expansion pieces (4), each of which forms a cylinder with a frustum-shaped inner hole. The rear end of each expansion piece (4) is also provided with a slot (5) on the outer side, and an elastic ring (6) is inserted into the concave ring formed by each slot (5), so that each expansion piece (4) remains connected in the shape of a cylinder. The front end of the rod body (1) has a frustoconical guide portion (7), the expander (3) is sleeved on the guide portion (7), and a convex ring (8) is provided between the rod body (1) and the guide portion (7).
2. A steel pipe end expansion mechanism as claimed in claim 1, characterized in that: The expander (3) is composed of three expansion sheets (4).
3. A steel pipe end expansion mechanism as claimed in claim 2, characterized in that: The rear end of each expansion piece (4) also has a fan-shaped protrusion (10) protruding outward, the clamping groove (5) is arranged outside the fan-shaped protrusion (10), and the fan-shaped protrusions (10) of each expansion piece (4) are connected to form a limit platform.
4. A steel pipe end expansion mechanism as claimed in claim 3, characterized in that: The length of the guide portion (7) is greater than the length of the dilator (3).
5. A steel pipe end expansion mechanism as claimed in claim 4, characterized in that: The front end of the guide portion (7) is also provided with a front limiting boss (11).
6. A steel pipe end expansion mechanism as claimed in claim 5, characterized in that: The front end of the guide portion (7) has a threaded section, a first nut is threadedly connected to the threaded section, and the first nut forms a front limit platform.
7. A steel pipe end expansion mechanism as claimed in claim 6, characterized in that: The convex ring (8) is welded between the rod body (1) and the guide portion (7).
8. A steel pipe end expansion mechanism as claimed in claim 7, characterized in that: A second slot (12) is also provided in the middle of each expansion piece (4) for snapping in another elastic ring.
9. A steel pipe end expansion mechanism as claimed in claim 8, characterized in that: A second nut is also threadedly connected to the rear end of the rod body (1), and the second nut forms a rear limiting boss (13).
10. A steel pipe end expansion mechanism as claimed in claim 9, characterized in that: The impact block (2) is a manual impact block or an automatic impact block.