Intermittent rotating structure for expansion tool and expansion tool

Abstract

The present invention discloses an intermittent rotating structure for an expansion tool, comprising: a rotating cam, a roller and a thimble, the roller being rotatably arranged at the tail of the thimble, the roller being in contact with the circumferential side wall of the rotating cam, the front end portion of the thimble being sleeved with a rotating sleeve, the tail portion of the thimble being sleeved with a guide sleeve, the outer side wall of the thimble located within the rotating sleeve and the guide sleeve being sleeved with a spring, the thimble moving along the direction of a guide groove provided on the guide sleeve, the outer side wall of the rotating sleeve being driven by a rotating gear, and a plurality of extensions being provided on the end surface of the rotating sleeve near the front end portion of the thimble; an incomplete gear being provided on the end surface of the rotating cam, a first driven gear being driven by one side of the incomplete gear, an extension rod being provided on the first driven gear, the extension rod extending to the rotating gear, and being transmission-connected to the rotating gear through a second driven gear; the present scheme has the characteristics of simple structure, easy operation, and intermittent rotation of a conical expansion head.

Description

Technical Field

[0001] The present invention relates to the field of expansion tools, and in particular to an intermittent rotating structure for an expansion tool and the expansion tool. Background Art

[0002] Due to the rising cost of copper pipes, polymer fittings are becoming increasingly popular in residential and commercial structures. One of the more common types of polymer fittings is made from cross-linked polyethylene, commonly known as PEX. Polymer fittings offer excellent toughness. They utilize the slow contraction of the pipe opening after expansion, allowing them to be connected to the fitting before the opening fully contracts. Once fully contracted, the pipe opening tightly wraps around the fitting. The closer the expanded pipe opening becomes to a circle, the better the airtightness between it and the fitting. A typical building will have numerous joints, so installing these fittings involves expanding the openings of many pipes. At present, there is an expansion tool on the market. During use, it was found that after the end of the expansion tool was inserted into the pipe fitting, since the expansion tool is hand-held and operated by the worker, it is not convenient to rotate, resulting in the expanded end of the pipe fitting being non-circular. This is due to the shape of the conical expansion head installed at the end of the expansion tool. Therefore, when expanding the pipe fitting, the conical expansion head needs to be rotated so that the pipe fitting is circular after expansion, which is convenient for adaptation and installation with the joint, so that the expanded pipe mouth and the joint fit tightly together. However, the conical expansion head cannot be rotated continuously during the expansion process, otherwise the pipe fitting cannot be expanded. Therefore, it is urgently needed to provide an intermittent rotation structure and expansion tool for an expansion tool to solve the above problems. Summary of the Invention

[0003] Therefore, it is necessary to provide an intermittent rotating structure for an expansion tool and an expansion tool that are simple in structure, easy to operate, and can effectively rotate a conical expansion head.

[0004] To achieve the above-mentioned object, the inventors provide an intermittent rotating structure for an expansion tool, comprising: a rotating cam, a roller, and an ejector pin, wherein the roller is rotatably mounted on the tail of the ejector pin, the roller being in contact with and connected to the circumferential side wall of the rotating cam, the front end of the ejector pin being sheathed with a rotating sleeve, the tail of the ejector pin being sheathed with a guide sleeve, the outer side wall of the ejector pin located within the rotating sleeve and the guide sleeve being sheathed with a spring, the ejector pin moving along the direction of a guide groove provided on the guide sleeve, the outer side wall of the rotating sleeve being driven by a rotating gear, and a plurality of extensions being provided on the end surface of the rotating sleeve near the front end of the ejector pin;

[0005] An incomplete gear is provided on the end surface of the rotating cam, and a first driven gear is provided on one side of the incomplete gear. An extension rod is provided on the first driven gear, and the extension rod extends to the rotating gear and is connected to the rotating gear through the second driven gear.

[0006] As a preferred embodiment of the present invention, the incomplete gear is provided with a meshing tooth, and the first driven gear includes a first tooth seat and a first driven tooth provided on the first tooth seat and transmission-connected to the meshing tooth on the incomplete gear.

[0007] As a preferred embodiment of the present invention, the incomplete gear includes a tooth seat and an engaging tooth provided on the tooth seat, the engaging tooth is a conical tooth, a notch is provided on the tooth seat where the engaging tooth is provided, the side of the first tooth seat is a regular polygon, the first driven tooth is a conical tooth, and the first driven tooth is connected to the engaging tooth in a transmission manner.

[0008] As a preferred embodiment of the present invention, the side of the first tooth seat is in contact with the side surface of the tooth seat of the incomplete gear close to the engaging tooth, and the corners of the two connected sides of the first tooth seat transitionally rotate through the notch set on the tooth seat of the incomplete gear.

[0009] As a preferred embodiment of the present invention, the regular polygon includes a regular triangle, a regular quadrilateral, a regular pentagon, a regular hexagon, a regular heptagon and a regular octagon.

[0010] As a preferred embodiment of the present invention, the rotating sleeve is provided with a first step near the rotating gear, the first step is provided with a plurality of protrusions, the inner wall of the rotating gear is provided with a plurality of slots, and the slots are engaged with the protrusions.

[0011] As a preferred embodiment of the present invention, a gap is provided between the side wall of the first step and the rotating gear, and inclined surfaces are provided on both side walls of the plurality of extensions provided on the end surface of the rotating sleeve.

[0012] As a preferred embodiment of the present invention, one end of the rotating sleeve close to the guide sleeve is sleeved in the guide sleeve.

[0013] As a preferred embodiment of the present invention, a second step is provided on the inner side wall of one end of the rotating sleeve close to the guide sleeve, a third step extending outward is provided on the rear end of the ejector pin, and both ends of the spring are respectively abutted against the second step and the third step.

[0014] To achieve the above-mentioned objectives, the inventors also provide an expansion tool, comprising the intermittent rotating structure for an expansion tool described in any one of the above-mentioned inventions, and also comprising a housing, a fixed sleeve and a conical expansion head, wherein the intermittent rotating structure for the expansion tool is arranged in the housing, the front ends of the ejector pin and the rotating sleeve extend from the housing, the fixed sleeve is arranged on the rotating sleeve and fixedly connected to the housing, the conical expansion head is movably and detachably arranged on the fixed sleeve, and the ejector pin is used to expand the conical expansion head.

[0015] Different from the prior art, the beneficial effects achieved by the above technical solution are: the setting of the incomplete gear in this structure and the cooperation with the first driven gear effectively realize intermittent transmission. When the meshing teeth of the incomplete gear engage with the first driven gear, the first driven gear is driven to rotate a certain angle, thereby driving the extension rod and the second driven gear to rotate intermittently, and further driving the rotating gear to rotate intermittently, the rotating gear drives the rotating sleeve to rotate intermittently, and the rotating sleeve drives the conical expansion head to rotate intermittently, thereby effectively realizing the intermittent rotation of the conical expansion head, making the expanded part of the pipe fitting circular, easier to match with the joint, and avoiding problems such as loose matching and penetration in non-circular shapes; in addition, this intermittent rotation structure is not only simple in structure, but also easy to operate, and does not require an additional power source. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the intermittent rotation structure of the expansion tool according to the specific embodiment;

[0017] Figure 2 A cross-sectional view of an intermittent rotating structure for an expansion tool according to a specific embodiment;

[0018] Figure 3 This is a schematic diagram of the incomplete gear structure described in the specific implementation method;

[0019] Figure 4 This is a schematic diagram of the installation structure of the incomplete gear and the first driven gear according to the specific implementation method;

[0020] Figure 5 This is a schematic diagram of the installation structure of the rotating sleeve described in the specific implementation method;

[0021] Figure 6 This is a schematic diagram of the installation structure of the rotating sleeve and the rotating gear according to the specific embodiment;

[0022] Figure 7 This is a schematic diagram of the installation structure of the tapered expansion head described in the specific embodiment;

[0023] Figure 8 This is a cross-sectional view of the expansion tool according to the specific embodiment.

[0024] Description of reference numerals:

[0025] 101. Rotating cam; 102. Rotating shaft; 103. Bearing; 104. Housing; 105. Fixed sleeve; 106. Conical expansion head; 107. Engaging part; 201. Roller; 202. Spring; 301. Ejector pin; 302. Third step; 401. Rotating sleeve; 402. Extension part; 403. Inclined surface; 404. First step; 405. Raised part; 406. Second step; 501. Guide sleeve; 502. Guide groove; 601. Rotating gear; 602. Engaging groove; 7. Incomplete gear; 701. Tooth seat; 702. Engaging tooth; 703. Notch; 801. First driven gear; 8011. First tooth seat; 8012. First driven tooth; 802. Extension rod; 803. Second driven gear; 901. Gap. DETAILED DESCRIPTION

[0026] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0027] like Figure 1 and Figure 2 As shown, this embodiment provides an intermittent rotating structure for an expansion tool, comprising: a rotating cam 101, a roller 201 and a thimble 301. The roller is rotatably arranged at the tail of the thimble, and the roller is in contact with the circumferential side wall of the rotating cam 101. The front end of the thimble is sleeved with a rotating sleeve 401, and the tail of the thimble is sleeved with a guide sleeve 501. The outer wall of the thimble located in the rotating sleeve and the guide sleeve is sleeved with a spring 202. The thimble moves in the direction of the guide groove 502 provided on the guide sleeve. The outer wall of the rotating sleeve is driven by a rotating gear 601, and a plurality of extensions 402 are provided on the end surface of the rotating sleeve near the front end of the thimble; an incomplete gear 7 is provided on the end surface of the rotating cam, and a first driven gear 801 is driven on one side of the incomplete gear 7. The first driven gear is provided with an extension rod 802, which extends to the rotating gear and is driven and connected to the rotating gear 601 through the second driven gear 803.

[0028] In this embodiment, when the rotating cam 101 rotates, the roller 201 rolls along the circumferential side wall of the rotating cam, thereby driving the ejector pin to reciprocate in the rotating sleeve and the guide sleeve. When the roller rolls to the convex portion of the rotating cam, the ejector pin extends from the rotating sleeve. At this time, the front end of the ejector pin 301 drives the conical expansion head to expand, thereby expanding the pipe fitting. In this embodiment, the conical expansion head 106 adopts the existing conical expansion head 106, such as Figure 7 and Figure 8As shown, as the rotating cam rotates, the roller gradually rolls to the recess of the rotating cam. At this time, the ejector pin 301 is retracted from the conical expansion head, and the conical expansion head contracts. After changing its position, as the ejector pin continues to reciprocate, the end of the pipe is expanded. In this embodiment, in order to make the pipe as circular as possible after expansion, so that it fits better with the joint when mating, and avoids leakage during later use, an intermittent rotation structure is provided in this embodiment. The first driven gear 801 is driven by the incomplete gear 7, and then the extension rod 802 and the second driven gear 803 are driven. The second driven gear drives the rotating gear to rotate intermittently, thereby driving the rotating sleeve to rotate, realizing intermittent rotation between the rotating sleeve and the conical expansion head. When each expansion is completed, the rotating sleeve drives the conical expansion head to rotate a certain angle, and expands the pipe again after changing its position, so that the pipe is as circular as possible after expansion, so that the pipe and the joint are better mated.

[0029] In the above embodiment, if Figure 7 and Figure 8 As shown, the rotating cam is connected to the motor (not shown) in the expansion tool through the rotating shaft 102, and both ends of the rotating shaft 102 are fixed in the housing 104 through bearings 103; when the motor starts to work and drives the rotating shaft 102 to rotate, the rotating cam rotates accordingly and starts to work.

[0030] In the above embodiment, if Figure 2 As shown, the end of the rotating sleeve 401 near the guide sleeve 501 is sleeved within the guide sleeve. A second step 406 is provided on the inner sidewall of the end of the rotating sleeve 401 near the guide sleeve. The rear end of the ejector pin is provided with a third step 302 extending outward. The two ends of the spring 202 are respectively abutted against the second step and the third step 302.

[0031] like Figure 3 and Figure 4As shown, in this embodiment, the incomplete gear 7 is provided with an engaging tooth 702, and the first driven gear 801 includes a first tooth seat 8011 and a first driven tooth 8012 provided on the first tooth seat and drivingly connected to the engaging tooth on the incomplete gear. In this embodiment, the incomplete gear 7 includes a tooth seat 701 and an engaging tooth 702 provided on the tooth seat. The engaging tooth is a conical tooth, and a notch 703 is provided on the tooth seat 701 where the engaging tooth is provided. The side of the first tooth seat is a regular polygon, and the first driven tooth is a conical tooth, and the first driven tooth is drivingly connected to the engaging tooth. In this embodiment, the engaging teeth 702 and the first driven teeth 8012 are set as conical teeth, which can effectively improve the engaging force and make the transmission more stable; the side of the first gear is set as a regular polygon, so that when the engaging teeth and the first driven teeth are not engaged, the side can be in contact and connected with the side of the tooth seat. At this time, the tooth seat can position the first driven gear so that it cannot rotate, further improving the stability of this structure, and avoiding the deviation in the fit between the engaging teeth and the first driven gear after the first driven gear rotates, so that the expansion frequency and expansion time interval of the rotating sleeve on the conical expansion head are uneven, resulting in poor expansion effect, and in severe cases, damage to the expansion tool.

[0032] In different embodiments, the meshing teeth of the incomplete gear can also be set at several locations as needed. In this case, the tooth seat at each meshing tooth is provided with a notch 703 .

[0033] In the above embodiment, the side of the first tooth seat is in contact and connected with the side surface of the tooth seat of the incomplete gear close to the engaging tooth, and the corners of the two sides connected by the first tooth seat are transitionally rotated through the notch set on the tooth seat of the incomplete gear; in this embodiment, the notch on the tooth seat is set to enable the corners of the two sides connected by the regular polygonal first tooth seat to rotate just through the notch, rotating from the previous side to the next side, to achieve an intermittent rotation; when the engaging tooth and the first driven tooth complete an engagement, the engaging tooth disengages from the first driven tooth, and at this time the tooth seat of the incomplete gear contacts the side of the first tooth seat of the first driven gear to achieve the positioning of the first driven gear, and when the engaging tooth engages with the first driven gear again, the first driven gear completes a rotation of a certain angle.

[0034] In the above embodiment, regular polygons include regular triangles, regular quadrilaterals, regular pentagons, regular hexagons, regular heptagons and regular octagons. Of course, in different embodiments, other regular polygons can also be used; in this embodiment, Figure 4 As shown, the regular polygon is a regular pentagon.

[0035] like Figure 5 and Figure 6As shown, in this embodiment, the rotating sleeve is provided with a first step 404 near the rotating gear, and a plurality of protrusions 405 are provided on the first step. A plurality of slots are provided on the inner wall of the rotating gear, and the slots 602 are engaged with the protrusions 405. In this embodiment, the rotating sleeve 401 and the rotating gear 601 are connected through the slots and the protrusions.

[0036] In certain embodiments, as Figure 6 and Figure 7 As shown, in order to achieve two-way tube removal, that is, during the use of the expansion tool, the reciprocating motion of the ejector pin will cause the rotating sleeve to move forward. When the rotating sleeve is always in the top position, the rotating sleeve and the conical expansion head will be always engaged, and the conical expansion head cannot be separated from the pipe. In this embodiment, a two-way tube removal structure is provided, that is, a gap 901 is provided between the side wall of the first step and the rotating gear, and the side walls of the two sides of the several extensions provided on the end face of the rotating sleeve are provided with inclined surfaces; in this embodiment, when the rotating sleeve and the conical expansion head are always engaged and the conical expansion head cannot be separated from the pipe, the body of the expansion tool can be twisted in both directions. At this time, the inclined surface 403 provided on the end face of the rotating sleeve will be separated from the engaging portion 107 of the conical expansion head 106 (as shown in FIG. Figure 7 As shown), the rotating sleeve moves backward, and the gap provided between the side wall of the first step and the rotating gear provides space for the rotating sleeve to move backward, thereby effectively achieving the effect of bidirectional tube removal.

[0037] like Figure 7 and Figure 8 As shown, this embodiment further provides an expansion tool, including the intermittent rotating structure for the expansion tool described in any of the above embodiments, and also includes a housing 104, a fixed sleeve 105 and a conical expansion head 106. The intermittent rotating structure for the expansion tool is arranged in the housing, and the front end portions of the ejector pin and the rotating sleeve extend from the housing. The fixed sleeve is arranged on the rotating sleeve and fixedly connected to the housing. The conical expansion head is movably and detachably arranged on the fixed sleeve, and the ejector pin is used to expand the conical expansion head.

[0038] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present invention. Therefore, based on the innovative concept of the present invention, changes and modifications to the embodiments described herein, or equivalent structural or equivalent process transformations made using the contents of the present invention's specification and drawings, and direct or indirect application of the above technical solutions to other related technical fields, are all included in the scope of patent protection of the present invention.

Claims

1. An intermittent rotating structure for an expansion tool, characterized in that: include: A rotating cam, a roller and an ejector pin, wherein the roller is rotatably arranged at the tail of the ejector pin, the roller is in contact with the circumferential side wall of the rotating cam, the front end of the ejector pin is sleeved with a rotating sleeve, the tail of the ejector pin is sleeved with a guide sleeve, the outer wall of the ejector pin located within the rotating sleeve and the guide sleeve is sleeved with a spring, the ejector pin moves along the guide groove provided on the guide sleeve, the outer wall of the rotating sleeve is driven by a rotating gear, and a plurality of extensions are provided on the end surface of the rotating sleeve near the front end of the ejector pin; An incomplete gear is provided on the end surface of the rotating cam, and a first driven gear is provided on one side of the incomplete gear. An extension rod is provided on the first driven gear, and the extension rod extends to the rotating gear and is connected to the rotating gear through the second driven gear. The incomplete gear is provided with a meshing tooth, and the first driven gear includes a first tooth seat and a first driven tooth provided on the first tooth seat and transmission-connected to the meshing tooth on the incomplete gear; The incomplete gear includes a tooth seat and an engaging tooth provided on the tooth seat, the engaging tooth is a conical tooth, and a notch is provided on the tooth seat where the engaging tooth is provided. The side of the first tooth seat is a regular polygon, the first driven tooth is a conical tooth, and the first driven tooth is transmission-connected to the engaging tooth.

2. The intermittent rotation structure for an expansion tool according to claim 1, characterized in that: The side of the first tooth seat is in contact with the side surface of the tooth seat of the incomplete gear close to the engaging tooth, and the corners of the two connected sides of the first tooth seat transitionally rotate through the notch set on the tooth seat of the incomplete gear.

3. The intermittent rotation structure for an expansion tool according to claim 1, characterized in that: The regular polygons include regular triangles, regular quadrilaterals, regular pentagons, regular hexagons, regular heptagons and regular octagons.

4. The intermittent rotation structure for an expansion tool according to claim 1, characterized in that: The rotating sleeve is provided with a first step near the rotating gear, and a plurality of protrusions are provided on the first step. A plurality of slots are opened on the inner wall of the rotating gear, and the slots are engaged with the protrusions.

5. The intermittent rotation structure for an expansion tool according to claim 4, characterized in that: A gap is provided between the side wall of the first step and the rotating gear, and inclined surfaces are provided on the side walls of the plurality of extensions provided on the end surface of the rotating sleeve.

6. The intermittent rotation structure for an expansion tool according to claim 1, characterized in that: One end of the rotating sleeve close to the guide sleeve is sleeved in the guide sleeve.

7. The intermittent rotation structure for an expansion tool according to claim 1, characterized in that: A second step is provided on the inner side wall of one end of the rotating sleeve close to the guide sleeve, a third step extending outward is provided on the rear end of the ejector pin, and both ends of the spring are respectively abutted against the second step and the third step.

8. An expansion tool, characterized in that: The intermittent rotating structure for an expansion tool comprises the intermittent rotating structure for an expansion tool as described in any one of claims 1 to 7 above, and further comprises a casing, a fixed sleeve and a conical expansion head, wherein the intermittent rotating structure for an expansion tool is arranged in the casing, the front ends of the ejector pin and the rotating sleeve extend from the casing, the fixed sleeve is arranged on the rotating sleeve and fixedly connected to the casing, the conical expansion head is movably and detachably arranged on the fixed sleeve, and the ejector pin is used to expand the conical expansion head.

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