An electric pipe expander

Abstract

The utility model provides an electric pipe expander, including upper casing and lower casing, install drive motor, transmission shaft, cam disc, cylindrical fixed base in lower casing, the inside top surface and bottom of cylindrical fixed base are provided with long strip guide hole along the axial direction, be provided with cam lever, one way bearing and rotating head in the hole of cylindrical fixed base, the rear end of cam lever is inserted in the upper and lower two long strip guide hole through the pin shaft, the tail end of cam lever is contacted with cam disc, sets up compression spring between cam lever and cylindrical fixed base, the long strip slide groove that goes through left and right side wall is set up to cam lever along the length direction, the left and right sides of long strip slide groove front end respectively set up the upper notched groove and the lower notched groove of opposite direction, one way bearing is provided with cam lever pin shaft along the radial direction, cam lever pin shaft passes long strip slide groove, one way bearing makes one way intermittent rotation through driving rotating head. The utility model can ensure that the pipe is expanded evenly.

Description

Technical Field

[0001] This utility model relates to the field of pipe expander technology, and in particular to an electric pipe expander. Background Technology

[0002] Pipe expanders are used to enlarge the diameter of pipe fittings to meet the pipe requirements of different working conditions.

[0003] In practical use, we have found that during pipe expansion, because pipe fittings are resilient, there is usually a certain stickiness between the expansion head mold installed on the pipe expander and the pipe fitting. As a result, the expansion work cannot be fully applied to the expansion wall, and the expansion force generated by the expansion is uneven, which affects the expansion effect. Utility Model Content

[0004] To address the aforementioned problems, this utility model aims to provide an electric tube expander that can keep the front tube expander plate rotating while expanding the tube, ensuring uniform tube expansion.

[0005] The present invention relates to an electric pipe expander, comprising an upper housing and a lower housing connected by screws. The lower housing includes a vertical portion and a horizontal portion. A drive motor, a transmission shaft, and a cam disc are installed in the vertical portion. A cylindrical fixing seat is fitted and limited in the horizontal portion. The inner top and bottom surfaces of the cylindrical fixing seat have elongated guide holes along the axial direction. A cam rod, a one-way bearing, and a rotating head are disposed within the inner hole of the cylindrical fixing seat. The rear end of the cam rod is inserted into the upper and lower elongated guide holes via a pin. The tail end of the cam rod contacts the cam disc. A compression spring is disposed between the cam rod and the cylindrical fixing seat. The cam rod has an elongated groove extending through both sides. The front end of the elongated groove has an upper notch and a lower notch in opposite directions on its left and right sides, respectively. A cam arranged radially is disposed within the elongated groove. The cam rod pin has long, narrow grooves extending from both ends and fixed to the inner ring of the one-way bearing. When the cam rod pin slides along the long, narrow grooves to its foremost point, it enters the upper and lower notch grooves, forcing the cam rod pin to rotate the inner ring of the one-way bearing by a certain angle. When the cam rod pin slides out of the upper and lower notch grooves, it forces the cam rod pin to rotate the inner ring of the one-way bearing in the opposite direction by a certain angle. The rotating head is connected to the outer ring of the one-way bearing by a key, and the rotating head follows the outer ring of the one-way bearing to maintain unidirectional intermittent rotation. Several expansion plates are connected to the front end of the rotating head. Each expansion plate is circumferentially positioned in a slot at the front end of the rotating head, and all expansion plates form a rotating body shape. A tapered expanding head is provided inside each expansion plate. The rear end of the tapered expanding head is connected to the front end of the cam rod by a pin. A locking cap is provided between the expansion plate and the cylindrical fixed seat.

[0006] Preferably, the number of expansion plates is 6, and the front end of the rotating head has 6 slots at equal angles along the circumferential direction. Each expansion plate is installed in a corresponding slot to achieve synchronous rotation of the two in the circumferential direction.

[0007] This invention allows the front-end expanding plate to remain in a rotating state while expanding the tube, ensuring uniform expansion. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model after the upper shell has been removed; Figure 3 for Figure 2 A structural diagram showing the removal of the cylindrical fixing base and locking cap; Figure 4 for Figure 3 Another viewpoint and a schematic diagram of the structure after removing the two expansion plates; Figure 5 This is a schematic diagram of the structure of some parts in this utility model; Figure 6 for Figure 5 A schematic diagram of the decomposed structure; Wherein: 1—Upper housing; 2—Lower housing; 3—Drive shaft; 4—Cam disc; 5—Cylindrical fixed seat; 51—Elongated guide hole; 6—Cam rod; 61—Elongated slide groove; 7—One-way bearing; 71—One-way bearing inner ring; 72—One-way bearing outer ring; 8—Rotating head; 9—Pin; 9a—Compression spring; 10—Cam rod pin; 11—Expansion plate; 12—Conical expansion head; 13—Locking cap. Detailed Implementation

[0009] The present invention will now be described in further detail with reference to the accompanying drawings.

[0010] like Figures 1 to 6As shown, this utility model provides an electric pipe expander, including an upper housing 1 and a lower housing 2 connected by screws. The lower housing 2 includes a vertical part and a horizontal part. A drive motor, a transmission shaft 3, and a cam disk 4 are installed in the vertical part. A cylindrical fixing seat 5 is engaged and limited in the horizontal part. The top and bottom surfaces of the inner side of the cylindrical fixing seat 5 are provided with elongated guide holes 51 along the axial direction. A cam rod 6, a one-way bearing 7, and a rotating head 8 are arranged in the inner hole of the cylindrical fixing seat 5. The rear end of the cam rod 6 is inserted into the upper and lower elongated guide holes 51 by a pin 9. The tail end of the cam rod 6 contacts the cam disk 4. A compression spring 9a is arranged between the cam rod 6 and the cylindrical fixing seat 5. The cam rod 6 is provided with an elongated groove 61 that runs through both sides. The front left and right sides of the elongated groove 61 are respectively provided with an upper notch and a lower notch in opposite directions. A cam rod pin 10 arranged radially is provided in the elongated groove 61. The pin 10 extends from both ends into the elongated groove 61 and is fixedly connected to the inner ring 71 of the one-way bearing. When the cam rod pin 10 slides along the elongated groove 61 to the front end, it enters the upper and lower notch grooves, forcing the cam rod pin 10 to rotate the inner ring 71 of the one-way bearing by a certain angle. When the cam rod pin 10 slides out of the upper and lower notch grooves, it forces the cam rod pin 10 to rotate the inner ring 71 of the one-way bearing in the opposite direction by a certain angle. The rotating head 8 is connected to the outer ring 72 of the one-way bearing by a key. The rotating head 8 follows the outer ring 72 of the one-way bearing and maintains unidirectional intermittent rotation. The front end of the rotating head 8 is connected to several expansion plates 11. Each expansion plate 11 is circumferentially positioned in the slot at the front end of the rotating head 8. All expansion plates 11 form a rotating body shape. The interior of each expansion plate 11 is provided with a tapered expansion head 12. The rear end of the tapered expansion head 12 is connected to the front end of the cam rod 6 by a pin. A locking cap 13 is provided between the expansion plate 11 and the cylindrical fixed seat 5.

[0011] Specifically, there are 6 expansion pieces 11, and the front end of the rotating head 8 has 6 slots at equal angles along the circumferential direction. Each expansion piece 11 is installed in one slot to achieve synchronous rotation of the two in the circumferential direction.

[0012] The drive motor rotates, causing the transmission shaft 3 to rotate, which in turn drives the cam disk 4 to rotate. During one rotation of the cam disk 4, the distance between its front surface and the center of the transmission shaft 3 gradually increases, pushing the cam rod 6 forward. As the cam rod 6 moves forward, it continuously compresses the compression spring 9a. When the cam disk 4 has rotated one full turn, the tail end of the cam rod 6 is suspended in the air and returns to its original position under the restoring force of the compression spring 9a. This rotation repeats continuously. During this cycle, the cam rod pin 10 switches back and forth between the elongated groove 61 and the upper and lower notch slots, driving the inner ring 71 of the one-way bearing to rotate. The inner ring 71 of the one-way bearing drives the outer ring 72 of the one-way bearing to rotate in one direction, which in turn drives the rotating head 8 to rotate in one direction, and then drives the expansion plate 11 to rotate in one direction. Throughout the transmission process, the drive motor is the power source, and the final output mechanism consists of two parts: the expansion plate 11 and the tapered expansion head 12. The tapered expansion head 12 only performs forward and backward extension movements, and its tail end connects to the cam rod 6, allowing it to extend and retract synchronously with the cam rod 6. The expansion piece 11 performs two movements: one is a unidirectional rotation following the rotating head 8, and the other is a radial outward expansion movement caused by the conical expanding head 12 pressing against the inner wall of the expansion piece 11 as it moves forward. This radial outward expansion movement is guided and limited by the slot at the front end of the rotating head 8 and the annular groove in the locking cap 13. Furthermore, return springs are fitted onto the outer surfaces of the tail ends of all six expansion pieces 11. When the conical expanding head 12 retracts, the restoring force of the return springs returns all six expansion pieces 11 to their initial state. This ensures that all six expansion pieces 11 contact the same position in the hole during the rotary expansion process, guaranteeing uniform hole expansion.

[0013] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the utility model. Any simple modifications, equivalent changes, or alterations made to the above embodiments based on the technical principles of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. An electric expander, comprising an upper housing (1) and a lower housing (2) connected by screws, characterized in that: The lower housing (2) includes a vertical part and a horizontal part. The vertical part is equipped with a drive motor, a transmission shaft (3) and a cam disc (4). The horizontal part is equipped with a cylindrical fixing seat (5) for locking and limiting. The top and bottom surfaces of the cylindrical fixing seat (5) are provided with elongated guide holes (51) along the axial direction. The inner hole of the cylindrical fixing seat (5) is provided with a cam rod (6), a one-way bearing (7) and a rotating head (8). The rear end of the cam rod (6) is inserted into the upper and lower elongated guides by a pin (9). Inside the hole (51), the tail end of the cam rod (6) contacts the cam disk (4). A compression spring (9a) is provided between the cam rod (6) and the cylindrical fixed seat (5). The cam rod (6) is provided with a long strip groove (61) that runs through both sides. The front end of the long strip groove (61) is provided with an upper notch and a lower notch in opposite directions on the left and right sides, respectively. A cam rod pin (10) is provided in the long strip groove (61) arranged radially. The two ends of the cam rod pin (10) extend out of the long strip groove (61) and are connected to the single... The cam rod pin (10) is fixed to the inner ring (71) of the bearing. When the cam rod pin (10) slides along the elongated groove (61) to the front end, it enters the upper and lower notch grooves, forcing the cam rod pin (10) to rotate the inner ring (71) of the one-way bearing by a certain angle. When the cam rod pin (10) slides out of the upper and lower notch grooves, it forces the cam rod pin (10) to rotate the inner ring (71) of the one-way bearing in the opposite direction by a certain angle. The rotating head (8) is connected to the outer ring (72) of the one-way bearing by a key. The rotating head (8) follows the one-way shaft. The outer ring (72) maintains unidirectional intermittent rotation; the front end of the rotating head (8) is connected to several expansion plates (11), each expansion plate (11) is circumferentially positioned in the slot at the front end of the rotating head (8), all expansion plates (11) form a rotating body shape, the inside of the expansion plate (11) is provided with a conical expansion head (12), the rear end of the conical expansion head (12) is connected to the front end of the cam rod (6) by a pin, and a locking cap (13) is provided between the expansion plate (11) and the cylindrical fixed seat (5).

2. The electric pipe expander according to claim 1, characterized in that: The number of expansion pieces (11) is 6. The front end of the rotating head (8) has 6 slots at equal angles along the circumferential direction. Each expansion piece (11) is installed in a slot to achieve synchronous rotation of the two in the circumferential direction.

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