Pipe expander

Abstract

The utility model provides a pipe expander, and belongs to the technical field of pipe expanding. The pipe expander solves the problem that the reaming effect is affected due to the fact that reaming force generated by an existing pipe expander is not uniform. The pipe expander comprises a pipe expander body composed of an outer shell and a top cover which are connected, a ratchet assembly which penetrates out of the outer shell and is used for installing a pipe expanding head mold is arranged in the pipe expander body, a conical head which is used for being sleeved with the ratchet assembly in a matched mode and can stretch out and draw back is arranged in the outer shell, and a cam assembly used for driving the conical head to push forwards is arranged in the outer shell and located behind the conical head. An adjusting assembly used for driving the ratchet assembly to deflect is further arranged in the shell, and the middle of the cam assembly is connected with a center shaft passing through the adjusting assembly. The utility model has the advantages that the expansion effect is improved, and the expansion force is uniform.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe expansion and relates to a pipe expander. Background Art

[0002] The pipe expander is used to expand the diameter of the pipe fittings to meet the pipe requirements in different working conditions.

[0003] In actual use, we found that when expanding the pipe, since the pipe fittings have plasticity, there will usually be a certain sticky feeling between the expanding head mold installed on the pipe expander and the pipe fittings. The expanding work cannot act on the expanded hole wall in an all-round way, and the expansion force generated by the expansion is uneven, which affects the expansion effect. Summary of the invention

[0004] The utility model aims to provide a pipe expander with improved hole expanding effect in view of the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a pipe expander, characterized in that it includes a pipe expander body composed of a connected outer shell and a top cover, the pipe expander body is provided with a ratchet assembly that passes through the outer shell and is provided for the installation of a pipe expander head mold, the outer shell is provided with a cone head that is fitted with the ratchet assembly and can be extended forward and backward, the outer shell is provided with a cam assembly that is located behind the cone head and is used to drive the cone head to push forward, the outer shell is also provided with an adjustment assembly that is used to drive the ratchet assembly to deflect, and the middle of the cam assembly is connected to a central axis that passes through the adjustment assembly.

[0006] In the above-mentioned pipe expander, the adjustment assembly includes a dividing wheel for the central axis to pass through and a dividing deflection wheel arranged on the side of the dividing wheel, a dividing shaft is connected inside the dividing deflection wheel, and a planetary gear meshing with the ratchet assembly is provided at the end of the dividing shaft;

[0007] The indexing wheel comprises an upper wheel arranged at the top and a lower wheel arranged at the bottom, a indexing wheel axle is provided between the upper wheel and the lower wheel, a plurality of deflection parts are distributed circumferentially on the peripheral wall of the indexing deflection wheel, a track groove is provided on the outer ring of the indexing wheel axle for the corresponding deflection part to enter, a transition part along the track groove is provided between the upper wheel and the lower wheel, the transition part is inclined and contacts the deflection part under the rotation of the indexing wheel, an upper passing groove is provided at the peripheral wall of the upper wheel and at a position corresponding to the transition part, a lower passing groove is provided at the peripheral wall of the lower wheel and at a position corresponding to the transition part, and an inclined surface A in contact with the deflection part is provided on the transition part.

[0008] In the above-mentioned pipe expander, the cam assembly is a cam plate, which contacts and pushes the cone head forward when the cam plate rotates.

[0009] In the above-mentioned pipe expander, a spring is sleeved on the cone head.

[0010] In the above-mentioned pipe expander, the outer end of the ratchet assembly has a ratchet portion that is matched with the planetary gear, and the inner end of the ratchet assembly has a gear portion that meshes with the planetary gear.

[0011] In the above-mentioned pipe expander, a driving motor for controlling the rotation of the central axis is provided at the bottom of the shell.

[0012] In the above-mentioned pipe expander, bearings are installed between the outer shell and the central axis and between the top cover and the central axis.

[0013] Compared with the prior art, the present pipe expander has the advantages of improving the expansion effect and making the expansion force uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional diagram of this pipe expander.

[0015] Figure 2 It is a partial stereoscopic view of the pipe expander.

[0016] Figure 3 It is a partial stereoscopic view of the pipe expander.

[0017] Figure 4 It is a partial stereoscopic view of the pipe expander.

[0018] Figure 5 It is a schematic diagram of the expansion head mold.

[0019] In the figure, 1, outer shell; 2, top cover; 3, ratchet assembly; 4, cone head; 5, center axis; 6, indexing deflection wheel; 7, indexing shaft; 8, planetary gear; 9, upper wheel; 10, lower wheel; 11, indexing wheel shaft; 12, deflection part; 13, track groove; 14, transition part; 15, upper through groove; 16, lower through groove; 17, cam plate; 18, spring; 19, ratchet part; 20, drive motor; 21, gear part; 22, bearing. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the tube expander comprises a tube expander body consisting of an outer shell 1 and a top cover 2 connected to each other, a ratchet assembly 3 passing through the outer shell 1 and for installing a tube expanding head mold is provided in the tube expander body, a cone head 4 which is fitted with the ratchet assembly 3 and can be extended forward and backward is provided in the outer shell 1, a cam assembly for driving the cone head 4 to push forward is provided in the outer shell 1 and behind the cone head 4, an adjusting assembly for driving the ratchet assembly 3 to deflect is also provided in the outer shell 1, a central axis 5 passing through the adjusting assembly is connected to the middle of the cam assembly, the ratchet assembly 3 is driven to deflect by the adjusting assembly, and then the deflection of the tube expanding head mold is controlled, so that the tube expanding head mold is deflected a certain degree in the pipe hole, the pipe hole is expanded more evenly, and the expanding force can act in all directions.

[0022] In further detail, the adjustment assembly includes a dividing wheel for the central axis 5 to pass through and a dividing deflection wheel 6 arranged on the side of the dividing wheel, a dividing shaft 7 is connected inside the dividing deflection wheel 6, and a planetary gear 8 is provided at the end of the dividing shaft 7 to mesh with the ratchet assembly 3. The dividing wheel includes an upper wheel 9 arranged at the top and a lower wheel 10 arranged at the bottom, and a dividing wheel shaft 11 is provided between the upper wheel 9 and the lower wheel 10. A plurality of deflection parts 12 are distributed on the circumference of the dividing deflection wheel 6, and a corresponding deflection part 12 is provided on the outer ring of the dividing wheel shaft 11. The track groove 13 for the deflection part 12 to enter is provided between the upper wheel 9 and the lower wheel 10, and a transition part 14 is provided along the track groove 13. The transition part 14 is inclined and contacts the deflection part 12 under the rotation of the indexing wheel. An upper through groove 15 is provided at the peripheral wall of the upper wheel 9 and at a position corresponding to the transition part. A lower through groove 16 is provided at the peripheral wall of the lower wheel 10 and at a position corresponding to the transition part 14. The transition part 14 has an inclined surface A in contact with the deflection part 12. The specific principle is as follows: Assuming that the deflection part 12 on the indexing deflection wheel 6 There are five deflection parts 12, which are deflection parts 12-1 / 2 / 3 / 4 / 5. In the initial state, the deflection part 12-1 is already located in the track groove 13. When the indexing wheel rotates and rotates to the inclined surface A of the transition part 14 to contact the deflection part 12-1, the deflection part 12-1 moves upward through the groove 15 along the inclined surface A. At the same time, the entire indexing deflection wheel 6 rotates, and the deflection part 12-2 adjacent to the deflection part 12-1 and located below the deflection part 12-1 passes through the lower through groove 16 and enters the track groove 1 3, the indexing deflection wheel 6 is deflected according to this rule. Each time a deflection portion 12 is passed, it is considered that the indexing deflection wheel 6 is deflected by one unit, so the indexing shaft 7 is also deflected by one unit, and the planetary gear 8 is also deflected by one unit, which drives the ratchet assembly 3 to deflect, and finally drives the expansion head mold to deflect. Therefore, during the hole expansion work, the expansion head mold is deflected in sequence, so that the expansion force of the expansion head mold acts on all directions of the pipe expansion hole, the expansion force is more uniform, and the expansion effect is better.

[0023] To further elaborate, the cam assembly is a cam plate 17, which contacts and pushes the cone head 4 forward under the rotation of the cam plate 17, thereby expanding the expansion head mold.

[0024] To be more specific, a spring 18 is sleeved on the cone head 4 to achieve a buffering and retracting effect on the cone head 4 .

[0025] To be more specific, the outer end of the ratchet assembly 3 has a ratchet portion 19 that is matched with the expansion head mold, and the inner end of the ratchet assembly 3 has a gear portion 21 that meshes with the planetary gear 8. The ratchet portion 19 deflects one unit and drives the expansion head mold to deflect.

[0026] Preferably, a driving motor 20 for controlling the rotation of the central shaft 5 is provided at the bottom of the housing 1 .

[0027] Preferably, bearings 22 are installed between the housing 1 and the central axis 5 and between the top cover 2 and the central axis 5 .

[0028] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0029] Although the present invention uses more terms such as housing 1, top cover 2, ratchet assembly 3, cone head 4, central shaft 5, indexing deflection wheel 6, indexing shaft 7, planetary gear 8, upper wheel 9, lower wheel 10, indexing wheel shaft 11, deflection part 12, track groove 13, transition part 14, upper through groove 15, lower through groove 16, cam plate 17, spring 18, ratchet part 19, drive motor 20, gear part 21, bearing 22, etc., it does not exclude the possibility of using other terms. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A pipe expander, characterized in that: The invention comprises a tube expander body composed of a connected outer shell (1) and a top cover (2); the tube expander body is provided with a ratchet assembly (3) extending out of the outer shell (1) and for mounting a tube expander head mold; the outer shell (1) is provided with a cone head (4) for fitting with the ratchet assembly (3) and being able to extend forward and backward; the outer shell (1) is provided with a cam assembly located behind the cone head (4) for driving the cone head (4) to move forward; the outer shell (1) is also provided with an adjustment assembly for driving the ratchet assembly (3) to deflect; the middle of the cam assembly is connected with a central shaft (5) passing through the adjustment assembly.

2. A pipe expander according to claim 1, characterized in that: The adjustment assembly comprises a dividing wheel through which the central axis (5) passes and a dividing deflection wheel (6) arranged on the side of the dividing wheel, a dividing shaft (7) is connected inside the dividing deflection wheel (6), and a planetary gear (8) meshingly connected with the ratchet assembly (3) is provided at the end of the dividing shaft (7); The indexing wheel comprises an upper wheel (9) arranged at the top and a lower wheel (10) arranged at the bottom, a indexing wheel shaft (11) is provided between the upper wheel (9) and the lower wheel (10), a plurality of deflection parts (12) are distributed on the circumference of the circumference wall of the indexing deflection wheel (6), a track groove (13) is provided on the outer ring of the indexing wheel shaft (11) for the corresponding deflection parts (12) to enter, a transition part (14) is provided along the track groove (13) between the upper wheel (9) and the lower wheel (10), the transition part (14) is arranged obliquely and contacts the deflection part (12) under the rotation of the indexing wheel, an upper through groove (15) is provided on the circumference wall of the upper wheel (9) and at a position corresponding to the transition part, a lower through groove (16) is provided on the circumference wall of the lower wheel (10) and at a position corresponding to the transition part (14), and an inclined surface A is provided on the transition part (14) for contacting the deflection part (12).

3. A pipe expander according to claim 1, characterized in that: The cam assembly is a cam plate (17), which contacts and pushes the cone head (4) forward when the cam plate (17) rotates.

4. A pipe expander according to claim 1, characterized in that: The cone head (4) is sleeved with a spring (18).

5. A pipe expander according to claim 1, characterized in that: The outer end of the ratchet assembly (3) has a ratchet portion (19) that is matched with the planetary gear (8), and the inner end of the ratchet assembly (3) has a gear portion (21) that meshes with the planetary gear (8).

6. A pipe expander according to claim 1, characterized in that: A driving motor (20) for controlling the rotation of the central shaft (5) is provided at the bottom of the housing (1).

7. A pipe expander according to claim 1, characterized in that: Bearings (22) are installed between the housing (1) and the central shaft (5) and between the top cover (2) and the central shaft (5).

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