A PE pipe expansion device

Abstract

The utility model discloses a PE pipe expansion device, which relates to the field of PE pipe processing, including an expansion arc plate for expanding the PE pipe, the expansion arc plate is movably connected in a circular tubular outer shell with an opening at the front end, the expansion arc plate is provided with four groups, the four groups of expansion arc plates are arranged at equal angles with the same center of a circle, and each group of expansion arc plates is provided with a plurality of pieces stacked sequentially from the inside to the outside, and by setting a plurality of expansion arc plates that are stacked and slidably connected sequentially, PE pipes of various thicknesses can be adapted. When expanding, it is only necessary to insert the PE pipe into the outer shell, and the expansion arc plate that exceeds the inner diameter of the PE pipe will automatically be pressed back, that is, the most suitable expansion arc plate is automatically selected for the expansion operation, and the operation is simple, convenient and fast.

Description

Technical Field

[0001] The utility model relates to the field of PE pipe processing, in particular to a PE pipe expanding device. Background Art

[0002] Before installing the joint on the PE pipe, the PE pipe needs to be expanded first because the outer diameter of the joint is generally larger than the inner diameter of the PE pipe. There are generally two ways to expand the PE pipe, hot and cold. The hot method is to heat the PE pipe to soften it, and then it can be directly put on the joint and fixed. The cold method is to use a expander to forcibly expand the PE pipe mouth without heating.

[0003] At present, the common expanders that use cold expansion methods often have a multi-level stepped nozzle at the front end to adapt to PE pipes of different diameters. However, the number of stepped nozzles is generally no more than three. The reason is that the more the number of stepped nozzles, the longer the nozzle will be. An overly long nozzle is not only difficult to operate, but also has a forward center of gravity that affects stability. In addition, since the commonly used expanders are manual and require human power to expand, the farther the nozzle is from the front end, the greater the force the worker must use. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a PE pipe expanding device to solve the technical problems in the prior art that the same expanding device is adapted to a variety of PE pipes of different thicknesses, and the cold-expanding operation is cumbersome.

[0005] Based on the above purpose, the utility model provides a PE pipe expansion device, including an outer shell, and the device also includes:

[0006] A flaring assembly is arranged in the outer shell, wherein a gap is provided between the flaring assembly and the inner wall of the outer shell so that the PE pipe can enter the inner part of the outer shell, and the flaring assembly comprises a plurality of plate members which are detachably sleeved with each other, and the plate members comprise a plurality of flaring arc plates, and the plurality of flaring arc plates are distributed around the same central axis;

[0007] The outer surface is provided with a flaring driving member of a slide plate, which is located in the innermost plate member, and the inner surface of the flaring arc plate is provided with a sliding groove, and the slide plate is slidably connected with the sliding groove;

[0008] A movable plate connected to the outer shell, wherein the bottom of the outermost expanded arc plate is slidably connected to the end surface of the movable plate;

[0009] The driving part is used to drive the expansion drive member to move along the central axis, and the end of the expansion drive member is an expansion part. The expansion part is used to drive each expansion arc plate to move away from each other when entering between the innermost expansion arc plates.

[0010] Furthermore, the driving part includes a driving motor fixed in the outer shell and a screw rod with one end fixedly connected to the output shaft of the driving motor, the expansion drive member also includes a connecting part connected to the bottom of the expansion part, the screw rod is threadedly connected to the screw hole provided at the bottom of the connecting part, and the movable plate is slidably connected to the inner wall of the outer shell.

[0011] Furthermore, the connecting portion is a cylindrical rod body, and the expansion portion is a spherical-bottomed frustum.

[0012] Furthermore, between adjacent plate components, the flared arc plate located on the inner side is slidably connected to the inner surface of the flared arc plate located on the outer side.

[0013] Furthermore, the radius of the thickest part of the expansion portion is equal to the sum of the radius of the connection portion and the thickness of the single-piece expanded arc plate.

[0014] Furthermore, a fixed plate is provided on the inner side of the movable plate, and a return spring is connected between the movable plate and the fixed plate.

[0015] Furthermore, the rear end of the outer shell is fixedly connected to a disc-shaped mounting seat with fixing bolts.

[0016] The advantages of the utility model are: 1. A plurality of flared arc plates are arranged which are superimposed and slidably connected in sequence, and can be adapted to PE pipes of various thicknesses without lengthening the outer shell and the length of the flared arc.

[0017] 2. When expanding, you only need to insert the PE pipe into the outer shell. The expanding arc plate that exceeds the inner diameter of the PE pipe will automatically retreat under pressure, that is, the most suitable expanding arc plate is automatically selected for the expanding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the external structure of the utility model.

[0020] Figure 2 It is a front view of the utility model.

[0021] Figure 3 It is a side view of the utility model.

[0022] Figure 4 It is a schematic diagram of the internal structure of the utility model.

[0023] Marked in the figure: 101, mounting seat, 102, outer shell, 103, flared arc plate, 104, flared driving member, 105, screw, 106, partition, 107, movable plate, 108, fixed plate, 109, return spring, 110, button, 111, driving part. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0025] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] The device of the present invention needs to be fixed before use. The device can be fixed on a wall or other workbench through bolts and a mounting base 101. Preferably, the outer shell 102 is kept horizontally placed.

[0027] like Figure 3 As shown, the key point of the utility model is that the outer shell 102 is provided with four groups of flared arc plates 103, and the four groups of flared arc plates 103 are four groups of fan-shaped arc plates arranged at the same angle with the same center. Preferably, the flared arc plates 103 are made of metal, especially stainless steel. The four groups of flared arc plates 103 move synchronously outward or inward. There is a gap between two adjacent groups of flared arc plates 103 in the four groups of flared arc plates 103, so there are 4 gaps in total, and the partitions 106 fixedly connected to the outer shell 102 are provided in the 4 gaps to improve the stability of the entire device and limit the four groups of flared arc plates 103.

[0028] The four groups of flared arc plates 103 are completely identical in size and structure, and are all composed of a plurality of flared arc plates 103 stacked together. Among them, the flared arc plates 103 on the relatively inner side of each group of flared arc plates 103 are slidably connected to the inner surface of the flared arc plates 103 on the relatively outer side. The sliding method can be to set a horizontal linear slide groove on the outer surface of the flared arc plates 103 on the relatively inner side, and to fix a raised slider on the inner side of the front end of the flared arc plates 103 on the relatively outer side, and the slider is stuck in and slidably connected in the slide groove.

[0029] Therefore, when expanding, it is only necessary to insert the PE tube into the outer shell 102. The part of the expanding arc plate 103 that exceeds the inner diameter of the PE tube will be forced to slide inwards during the insertion of the PE tube because it will contact the front end surface of the PE tube. The inner part of the expanding arc plate 103 extends into the interior of the PE tube. This part of the expanding arc plate 103 will play a role in squeezing the PE tube and forcing it to expand in the subsequent process, that is, the most suitable expanding arc plate is automatically selected for the expanding operation.

[0030] On the other hand, the inner ends of the four groups of flared arc plates 103 are also provided with movable plates 107, and the movable plates 107 are slidably connected in the outer shell 102. Among the four groups of flared arc plates 103, only the outermost flared arc plates 103 are in contact with and slidably connected to the movable plates 107, while the other flared arc plates 103 are in contact with the movable plates 107 in the initial position, but are also separable.

[0031] The above-mentioned initial position refers to the position of the internal components of the device in the normal state, wherein a fixed plate 108 is also provided on the inner side of the movable plate 107, and a reset spring 109 is connected between the movable plate 107 and the fixed plate 108. The function of the reset spring 109 is to reset, so that the movable plate 107 and the flared arc plate 103 are reset to the initial position when the device is not in use.

[0032] Preferably, a button 110 for starting the drive motor 111 is also provided on the side wall of the fixed plate 108 relative to the movable plate 107. Therefore, when the PE tube is inserted into the outer shell 102, the flared arc plate 103 that exceeds the inner diameter of the PE tube will automatically be pressed backward, and the flared arc plate 103 will retreat with the movable plate 107 until it retreats to the point where the movable plate 107 touches the button 110. The button 110 is squeezed and pressed by the movable plate 107, which will start the drive motor 111.

[0033] The operation of the driving motor 111 can be set in advance, and it will automatically reverse and reset after working for a fixed time after starting or the output shaft rotates a fixed number of times.

[0034] On the other hand, the button 110 may also be disposed outside the outer shell 102 to control the drive motor 111 by means of a manual switch.

[0035] After the driving motor 111 is working, the output shaft rotates to drive the screw 105 to rotate. Since the inner half of the expansion drive 104 is a cylindrical connection part, and the connection part is threadedly connected to the screw 105, and since the expansion drive 104 is slidably connected to the inner surface of the innermost expansion arc plate 103, the screw 105 will drive the expansion drive 104 to slide inward, and the outer half of the expansion drive 104 is a spherical bottom truncated cone-shaped expansion part. Therefore, during the expansion drive 104 sliding inward, the expansion arc plate 103 will be pushed outward, so as to expand the PE pipe sleeved on the outer side of the expansion arc plate 103.

[0036] The radius of the thickest part of the expansion portion is equal to the sum of the radius of the connection portion and the thickness of the single-piece expanded arc plate 103 .

[0037] This means that the diameter of the expanded PE tube is increased by the thickness of two single expanded arc plates 103 compared to the original diameter. If further expansion is required, the expanded PE tube can be just put on the next relatively outer expanded arc plate 103, and then expanded again.

[0038] Preferably, the thickness of the single-piece flared arc plate 103 in the present invention can be set according to conventional joint models or customized according to customer needs.

[0039] Preferably, the sliding connection between the expansion drive member 104 and the innermost expansion arc plate 103 can be achieved in the following manner: a slide groove is provided on the outer surface of the expansion drive member 104, and a raised slider is fixedly connected to the inner side of the front end of the innermost expansion arc plate 103, and the slider is stuck in and slidably connected in the slide groove.

[0040] In addition, a switch for controlling the start and stop of the driving motor 111 may be provided outside the device. Example

[0041] When using the device of the utility model for expanding, it is only necessary to insert the front end of the PE tube into the outer shell 102, wherein the portion of the expanding arc plate 103 smaller than the diameter of the PE tube will automatically penetrate into the PE tube, while the portion of the expanding arc plate 103 exceeding the diameter of the PE tube will abut against the front end surface of the PE tube and be forced to slide inward during the insertion of the PE tube.

[0042] The expanded arc plate 103 that slides inwards will slide inwards with the movable plate 107 at its inner end, and the inner end of the movable plate 107 is the fixed plate 108, and a return spring 109 is connected between the movable plate 107 and the fixed plate 108, and the fixed plate 108 is also provided with a button 110 for starting the driving motor 111. Therefore, the movable plate 107 will eventually touch the button 110 when sliding inwards, and press it to start the driving motor 111.

[0043] After the driving motor 111 starts working, the output shaft rotates and drives the screw 105 to rotate, and the screw 105 drives the expansion drive 104 to slide inward. The outer half of the expansion drive 104 is a spherical cone-shaped expansion part. Therefore, the expansion arc plate 103 will be pushed outward during the inward sliding process of the expansion drive 104, thereby achieving the effect of expanding the PE pipe sleeved on the outside of the expansion arc plate 103.

[0044] When the expansion part also completely enters the flaring arc plate 103, the maximum flaring is reached, that is, the flaring is completed, and the PE pipe can be pulled out. According to the pre-set, the drive motor 111 reverses and drives the flaring drive member 104 to reset through the screw 105, and the reset spring 109 also forces the movable plate 107 and the flaring arc plate 103 sliding inward to reset.

[0045] The diameter of the expanded PE tube is increased by the thickness of two single expanded arc plates 103 compared to the original one. If further expansion is required, the expanded PE tube can be just put on the next relatively outer expanded arc plate 103, and then the second expansion can be performed.

[0046] Based on the above, the utility model can adapt to PE pipes of various thicknesses by setting a plurality of expansion arc plates 103 that are superimposed and slidably connected in sequence. When expanding, it is only necessary to insert the PE pipe into the outer shell 102, and the expansion arc plate 103 that exceeds the inner diameter of the PE pipe will automatically be pressed back, that is, the most suitable expansion arc plate 103 is automatically selected for the expansion operation. When the expansion arc plate 103 retreats into place, the movable plate 107 touches the button 110, and then the drive motor 111 is started to work, and the expansion operation is automatically performed, achieving the technical effect that the PE pipe can be automatically expanded after being inserted into the outer shell into place, and the operation is simple, convenient and fast.

[0047] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention, including the claims, is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0048] The utility model is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A PE pipe expansion device, comprising an outer shell (102), characterized in that: The device also includes: A flaring component is arranged in the outer shell (102), a gap is provided between the flaring component and the inner wall of the outer shell (102) to allow the PE pipe to enter the inner part of the outer shell (102), and the flaring component comprises a plurality of plate components which are detachably sleeved with each other, the plate components comprise a plurality of flaring arc plates (103), and the plurality of flaring arc plates (103) are distributed around the same central axis; An expansion drive member (104) of a slide plate is provided on the outer surface and is located in the innermost plate member; a slide groove is provided on the inner surface of the expansion arc plate (103); the slide plate is slidably connected to the slide groove; A movable plate connected to the outer shell (102), the bottom of the outermost flared arc plate (103) being slidably connected to the end surface of the movable plate (107); A driving part for driving the expansion drive member (104) to move along the central axis, wherein the end of the expansion drive member (104) is an expansion part, and the expansion part is used to drive the expansion arc plates (103) to move away from each other when entering between the innermost expansion arc plates (103).

2. A PE pipe expansion device according to claim 1, characterized in that: The driving portion comprises a driving motor (111) fixed in the outer shell (102) and a screw rod (105) having one end fixedly connected to an output shaft of the driving motor (111); the expansion drive member (104) further comprises a connecting portion connected to the bottom of the expansion portion; the screw rod (105) is threadedly connected to a screw hole provided at the bottom of the connecting portion; and the movable plate (107) is slidably connected to the inner wall of the outer shell (102).

3. A PE pipe expansion device according to claim 2, characterized in that: The connecting part is a cylindrical rod body, and the expansion part is a spherical bottom frustum.

4. A PE pipe expansion device according to claim 1 or 3, characterized in that: Between adjacent plate components, the flared arc plate (103) located on the inner side is slidably connected to the inner surface of the flared arc plate (103) located on the outer side.

5. A PE pipe expansion device according to claim 2, characterized in that: The radius of the thickest part of the expansion portion is equal to the sum of the radius of the connection portion and the thickness of the single-piece expanded arc plate (103).

6. A PE pipe expansion device according to claim 2, characterized in that: A fixed plate (108) is also provided on the inner side of the movable plate (107), and a return spring (109) is connected between the movable plate (107) and the fixed plate (108).

7. A PE pipe expansion device according to claim 4, characterized in that: The rear end of the outer shell (102) is fixedly connected to a disc-shaped mounting seat (101) with fixing bolts.

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