End head pipe expander capable of protecting splicing pipeline
By adding a flange ring to the tube expander to form a protective groove, the problems of deformation and cracking of the tube end during the expansion process are solved, achieving high-quality expansion effect and simple operation.
Patent Information
- Application Number
- CN202423037494.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-10
AI Technical Summary
Existing tube expanders are prone to causing deformation or cracking of the joint end when expanding the steel pipe end, affecting the sealing effect and making it difficult to guarantee the expansion quality.
Design a pipe end expander that can protect the spliced pipe. Add a flange ring to form a protective groove to prevent the expansion shell from directly contacting the splice pipe end. The flange ring and the carrier bear the friction force to protect the splice pipe end from deformation.
It effectively protects the ends of the connecting pipe, preventing deformation and cracking, ensuring the quality of the expansion joint, improving the sealing effect, simplifying the operation process, and improving work efficiency.
Smart Images
Figure CN223571851U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tube expander technology, and in particular to a tube expander that can protect the end of a connecting pipe. Background Technology
[0002] The main components of an existing tube expander include expansion balls, expansion shell, and expansion rod. Tube expanders are used in the manufacture, installation, and maintenance of boilers and various heat exchange equipment to enlarge the inner and outer diameters of the steel tube ends, ensuring a tight seal between the steel tube ends and the equipment carrier, preventing water and air leakage.
[0003] During normal operation, the extension pipe needs to be expanded and closed with the matching round hole opened on the equipment carrier itself, so that the two form a fixed connection through the expansion of the pipe and achieve a sealing effect.
[0004] During pipe expansion, the expansion rod rotates, causing the expansion balls to rotate and roll circumferentially along the inner wall of the connector. Simultaneously, the expansion rod moves towards the workpiece under external force, forcing the expansion balls to gradually expand outwards and continuously roll against the inner wall of the connector, gradually increasing its diameter until it tightly seals against the orifice of the carrier. The circumferentially rolling expansion balls drive the expansion shell to rotate and gradually move towards the carrier until the front end of the expansion shell contacts the end of the connector, continuously squeezing and rubbing against it. This causes deformation of the connector end, and in severe cases, cracking and poor sealing may occur, making it difficult to guarantee the quality of the expansion joint.
[0005] Based on this, the present invention designs an end expander that can protect the continuation pipe to solve the above problems. Utility Model Content
[0006] The purpose of this invention is to provide an end expander that can protect the joint pipe. This device adds a flange ring to protect the joint pipe during the expansion process, preventing the pipe end from being squeezed or deformed by expansion, and preventing the pipe end from cracking, thereby ensuring the expansion accuracy and keeping the joint pipe and the carrier in a sealed installation.
[0007] This utility model is implemented as follows: a pipe end expander that can protect the connection of pipes, comprising:
[0008] Expansion shell, connecting pipe, carrier and expansion tube;
[0009] The expansion shell is a cylindrical expansion head of a tube expander. An expansion tube is fixedly installed at the front end of the expansion shell. A flange ring is provided around the edge of the front end face of the expansion shell, and the flange ring protrudes forward on the front end face of the expansion shell.
[0010] The expansion pipe and the expansion shell are overall circular pipe structures with open front and back ends, and an expansion rod is movably inserted in the expansion pipe and the expansion shell; expansion beads are embedded on the outer wall of the expansion pipe and penetrate the inner and outer walls of the expansion pipe; the expansion beads protrude on the outer wall of the expansion pipe and extend into the inner wall of the expansion pipe; the expansion rod and the expansion beads abut against each other;
[0011] The expansion rod is a conical long rod with a small front end and a large back end; the expansion rod is slidably arranged in the expansion pipe and the expansion shell in the front-back direction;
[0012] The flange ring is a circular ring structure, is arranged around the outside of the expansion pipe, and has a front end not in contact with the expansion pipe and a back end connected to the back end of the expansion shell as an integral structure;
[0013] The gap between the flange ring and the expansion shell forms a protection groove; the protection groove is an annular groove with an open front end;
[0014] The continuation pipe is a circular pipe, and a circular hole is formed in the carrier; the continuation pipe is inserted into the circular hole of the carrier;
[0015] The back end of the continuation pipe extends to the back side of the carrier, the continuation pipe extends into the protection groove, and the continuation pipe does not contact the flange ring and the expansion shell;
[0016] The axes of the expansion shell, the flange ring, the expansion pipe and the expansion rod coincide.
[0017] Further, the length d of the continuation pipe extending backward is less than the depth s of the protection groove, the inner diameter of the protection groove is greater than the outer diameter of the continuation pipe, and the difference is not less than 2 mm.
[0018] Further, the back end of the expansion shell is further provided with a driving square head; the expansion shell is driven by the driving device through the driving square head;
[0019] The driving square head coincides with the axis of the expansion shell.
[0020] Further, the front end face of the flange ring is a flat circular mirror face, and the front end face of the flange ring is perpendicular to the axis of the expansion shell;
[0021] The front end opening inner diameter of the flange ring is greater than the outer diameter of the continuation pipe, and the difference is not less than 2 mm.
[0022] The beneficial effects of the utility model are: 1. The device increases the flange ring to form a protection groove, the protection groove makes the end of the continuation pipe completely separate from the expansion shell, the axial pressure and the circumferential friction generated by the expansion joint are all borne by the flange ring and the carrier, thereby effectively protecting the continuation pipe port, avoiding deformation, cracking and other conditions of the end of the continuation pipe, and effectively ensuring the expansion joint quality.
[0023] 2. During the whole expanding process, the operator does not need to worry about the position of the flange ring expanded shell, only needs to ensure that the end of the connecting pipe protruding out of the surface of the carrier is less than the depth of the protection groove, and the end of the connecting pipe can be effectively protected, and the expanding operation becomes simple, the product is effectively stored, and the efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS
[0024] The utility model will be further explained below in combination with the embodiments with reference to the drawings.
[0025] Fig. 1 It is a whole structure schematic view of the utility model;
[0026] Fig. 2 It is a whole cross section structure schematic view of the utility model;
[0027] Fig. 3 It is an enlarged schematic view of A part structure of the utility model.
[0028] In the drawings, the component list represented by each sign is as follows:
[0029] 1-expanded shell, 11-flange ring, 12-protection groove, 13-driving square head, 2-connecting pipe, 3-carrier, 4-expanding pipe, 41-expanding bead, 42-expanding rod. DETAILED DESCRIPTION
[0030] Please refer to Figs. 1 to 3 The utility model provides a kind of end expanding pipe protector, to better understand the above technical solution, the above technical solution will be explained in detail below in combination with the drawings and specific embodiments of the specification.
[0031] In one specific embodiment of the technical scheme of the utility model:
[0032] Including expanded shell 1, connecting pipe 2 and carrier 3;
[0033] Expanded shell 1 is the cylindrical expansion head of expander, expanding bead 42 is fixedly arranged at the front end of expanded shell 1,
[0034] Drive square head 13 is also arranged at the rear end of expanded shell 1, and expanded shell 1 is driven by drive device through drive square head 13; Drive square head 13 coincides with the axis of expanded shell 1. Drive square head 13 is installed and locked with drilling tool or driving motor, and then expanded shell 1 is driven and rotated by drive square head 13 of square head. Drive square head 13 is the common drilling rod locking structure, which can be clamped and driven with drilling tool.
[0035] Expanding pipe 4 is fixedly arranged at the front end of expanded shell 1, and flange ring 11 is arranged around the front end surface edge of expanded shell 1, and flange ring 11 is protruded on the front end surface of expanded shell 1;
[0036] The inflation tube 4 and the inflation shell 1 are overall circular tube structures with open front and rear ends, and an inflation rod 42 is movably inserted in the inflation tube 4 and the inflation shell 1; the inflation tube 4 is embedded with an inflation bead 41 on the outer wall, and the inflation bead 41 penetrates the inner and outer walls of the inflation tube 4; the inflation bead 41 protrudes on the outer wall of the inflation tube 4 and extends into the inner wall of the inflation tube 4; the inflation rod 42 abuts against the inflation bead 41;
[0037] The inflation rod 42 is a conical long rod with a thin front end and a thick rear end; the inflation rod 42 is slidably arranged in the inflation tube 4 and the inflation shell 1 in the front-rear direction;
[0038] The flange ring 11 is a circular ring structure, and the flange ring 11 is annularly arranged outside the inflation rod 42; the front end of the flange ring 11 is not in contact with the inflation rod 42, and the rear end of the flange ring 11 is connected with the rear end of the inflation shell 1 as an integral structure;
[0039] The gap between the flange ring 11 and the inflation shell 1 forms a protection groove 12; the protection groove 12 is an annular groove, and the protection groove 12 is a gap spaced between the flange ring 11 and the inflation shell 1, and the front end of the protection groove 12 is open;
[0040] The device to be installed includes a connecting pipe 2 and a carrier 3; the connecting pipe 2 is a circular pipe, and the carrier 3 is provided with a circular hole; the connecting pipe 2 is inserted into the circular hole of the carrier 3; before rotation and expansion, the connecting pipe 2 and the carrier hole are gap-fitted, and after expansion, the connecting pipe 2 and the carrier hole are interference-fitted; and the small molecule expansion connecting pipe is integrated.
[0041] The rear end of the connecting pipe 2 extends out of the rear side of the carrier 3, the connecting pipe 2 extends into the protection groove 12, and the connecting pipe 2 does not contact the flange ring 11 and the inflation shell 1;
[0042] The length d of the rear end of the connecting pipe 2 extending out is less than the depth s of the protection groove 12, the inner diameter of the protection groove 12 is greater than the outer diameter of the connecting pipe, and the difference is not less than 2 mm; the rear end of the connecting pipe 2 is protected by the flange ring 11, so that the pipe port is prevented from collapsing or expanding due to stress.
[0043] The axes of the inflation shell 1, the flange ring 11, the inflation tube 4 and the inflation rod 42 coincide.
[0044] The front end surface of the flange ring 11 is a flat circular surface, and the front end surface of the flange ring 11 needs to be a mirror surface; the front end mirror surface of the flange ring 11 needs to continuously abut against the rear side wall of the carrier 3; reducing the roughness is conducive to reducing the friction force, reducing the power loss, and reducing the friction; and the front end surface of the flange ring 11 is perpendicular to the axis of the inflation shell 1, so that the direction of the thrust force is more accurate when abutting, and the force is more convenient to apply;
[0045] The front end opening inner diameter of the flange ring 11 is greater than the outer diameter of the connecting pipe 2, and the difference is not less than 2 mm.
[0046] It should be noted that:
[0047] The existing expander is used, the driving device drives the expander 1 to rotate in the expander shell 3 through the transmission square head 13, drives the expander bead 41 to rotate and continue to roll on the inner wall of the connecting pipe 2, the expander bead 41 drives the expander shell 3 to rotate and move to the carrier direction, because there is no protection of the flange ring 11 and the protection groove 12, the expander shell 1 and the expander pipe 4 are actually an integral structure, only the expander shell 1 is at the rear end, the expander pipe 4 is at the front end, and the front end face of the expander shell 1 finally contacts the rear extension end of the connecting pipe 2, and the front end face of the expander pipe 4 continuously extrudes and rubs the port of the connecting pipe 2 and the carrier 3 to be sealed, so that the pipe opening of the connecting pipe 2 is deformed, cracked and the like, and the connecting pipe 2 and the carrier 3 are not tightly expanded, and the sealing effect cannot be achieved. The device is improved to increase the flange ring 11 to form the protection groove 12, protect the extension part of the connecting pipe 2, avoid the deformation and cracking of the pipe opening, and ensure the expansion quality.
[0048] The utility model discloses in using, driving device drives expander 1 to rotate in expander shell 3 through transmission square head 13, drives expander bead 41 to rotate and continue to roll on the inner wall of connecting pipe 2, expander bead 41 drives expander shell 3 to rotate and move to carrier direction, when the front end face of flange ring 11 contacts carrier 3, and moves to stop, when flange ring 11 and the outer portion of the round hole of carrier 3 bear extrusion and friction force that the expansion process produces together, and the end of connecting pipe 2 that extends outside carrier is in protection groove 12, and does not contact other parts, and is not extruded and rubbed and is protected well. At this time, expander 1 will further move to the inside of expander shell 3 under the action of external force in the rotating process, force expander bead 41 to expand outward, and continuously roll and press the inner wall of connecting pipe 2, make the pipe wall of connecting pipe 2 expand outward gradually, until the expansion operation ends after the outer wall of connecting pipe 2 and the orifice of carrier 3 are closely engaged. The end of connecting pipe 2 is in protection groove 12 in the whole process, will not be extruded and rubbed, will not appear deformation, cracking and the like, effectively improve the expansion quality, and operation is simpler, improve the work efficiency.
[0049] Although the specific embodiments of the utility model are described above, those skilled in the technical field should understand that the specific examples we described are only illustrative, and are not used to limit the scope of the utility model, and equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the utility model should be covered in the scope of protection of the claims of the utility model.
Claims
1. A pipe end expander capable of protecting a connecting pipe, the device to be installed comprising: The continuation pipe (2) and the carrier (3) are provided. The continuation pipe (2) is a round pipe. The carrier (3) has a round hole. The continuation pipe (2) is inserted into the round hole of the carrier (3). The expander is characterized by comprising: an expansion shell (1) and an expansion tube (4); The expansion shell (1) is a cylindrical expansion head of a tube expander. An expansion tube (4) is fixedly provided at the front end of the expansion shell (1). A flange ring (11) is provided around the edge of the front end face of the expansion shell (1). The flange ring (11) protrudes forward on the front end face of the expansion shell (1). The expansion tube (4) and expansion shell (1) are integral cylindrical tube structures with openings at both ends. An expansion rod (42) is also movably inserted inside the expansion tube (4) and expansion shell (1). An expansion bead (41) is embedded in the outer wall of the expansion tube (4), and the expansion bead (41) penetrates the inner and outer side walls of the expansion tube (4). The expansion bead (41) protrudes from the outer wall of the expansion tube (4), and the expansion bead (41) extends into the inner wall of the expansion tube (4). The expansion rod (42) and the expansion bead (41) abut against each other. The expansion rod (42) is a long conical rod that is thinner at the front and thicker at the back; the expansion rod (42) is slidably disposed inside the expansion tube (4) and the expansion shell (1) in the front-back direction; The flange ring (11) is a circular ring structure. The flange ring (11) is arranged around the outside of the expansion tube (4). The front end of the flange ring (11) does not contact the expansion tube (4). The rear end of the flange ring (11) is connected to the rear end of the expansion shell (1) as an integral structure. The gap between the flange ring (11) and the expansion shell (1) forms a protective groove (12); the protective groove (12) is an annular groove with an opening at the front end; The rear end of the extension pipe (2) extends out of the rear side of the carrier (3), the extension pipe (2) extends into the protective groove (12), and the extension pipe (2) does not contact the flange ring (11) and the expansion shell (1); The axes of the expansion shell (1), flange ring (11), expansion tube (4) and expansion rod (42) coincide.
2. The end expander for protecting the connecting pipe as described in claim 1, characterized in that: The length d of the extension pipe (2) extending backward is less than the depth s of the protective groove (12), and the inner diameter of the protective groove (12) is greater than the outer diameter of the extension pipe, with a difference of not less than 2 mm.
3. The pipe expander for protecting the end of a connecting pipe according to claim 1, characterized in that: The rear end of the expansion shell (1) is also provided with a transmission square head (13), and the expansion shell (1) is transmitted to the driving device through the transmission square head (13); The transmission square head (13) coincides with the axis of the expansion shell (1).
4. The end expander for protecting the connecting pipe as described in claim 1, characterized in that: The front end face of the flange ring (11) is a flat circular mirror surface, and the front end face of the flange ring (11) is perpendicular to the axis of the expansion shell (1). The inner diameter of the front opening of the flange ring (11) is greater than the outer diameter of the connecting pipe (2), and the difference is not less than 2 mm.