Loading and unloading device for pipe expander

Abstract

The utility model provides a loading and unloading device for a tube expander, the loading and unloading device is used for conveying a cylindrical tube expanding core composed of at least two expansion sheets, and each expansion sheet is provided with a threaded hole for loading and unloading. The assembling and disassembling device comprises a step screw, a bottom plate and a holding tool. The step screw comprises a screw rod and a step part and can be screwed into the threaded holes of the expansion pieces in a one-to-one correspondence mode. The base plate is configured to allow all of the step screws to be removably attached to the base plate at the same time. The holding tool is designed to be connected with the bottom plate and is used for driving the bottom plate to move under the driving of external force. By means of the loading and unloading device with the structure, a plurality of expansion pieces can be hoisted at a time, model changing time is saved, and safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pipe expanding equipment, especially a loading and unloading device for the pipe expander. BACKGROUND

[0002] This part provides background information related to the utility model, which does not necessarily constitute the prior art.

[0003] The pipe expander is a device for expanding the pipe diameter, which usually includes an expander core and a traction device. The pipe to be processed can be sleeved on the outer periphery of the expander core. The expander core is composed of multiple expansion pieces, and the traction device is used to apply a radial outward force to each expansion piece to move each expansion piece radially outward, thereby achieving the purpose of expanding the pipe diameter. The expander core can realize the pipe expanding function with at least two expansion pieces.

[0004] In the actual use of the pipe expander, the expander core needs to be repeatedly loaded and unloaded from the traction device. However, each expansion piece that constitutes the expander core is heavy, and the current method for loading and unloading the expander core is to directly extract each expansion piece by hand or to use a crane to lift the expansion piece. When using the method of extracting by hand, the efficiency is low and the operator may be injured. When using the method of lifting by crane, the crane can only lift one expansion piece at a time, which takes a long time and costs a lot. The above problems need to be solved. UTILITY MODEL CONTENTS

[0005] The utility model aims to solve the technical problem of realizing quick change of the expander core, improving production efficiency, and reducing the risk of injury.

[0006] The utility model provides a loading and unloading device for a pipe expander, which is used to transport a cylindrical expander core composed of at least two expansion pieces. A threaded hole for loading and unloading is provided at the upper axial end surface of each expansion piece. The loading and unloading device includes at least two stepped screws, a bottom plate, and a holding tool. The stepped screw includes a screw rod and a stepped portion protruding radially from the outer surface of the screw rod. The stepped screw can be screwed into the threaded hole of the expansion piece one by one. The bottom plate is configured to allow all the stepped screws to be detachably attached to the bottom plate simultaneously. The holding tool is designed to be coupled to the bottom plate and used to drive the bottom plate to move under the action of an external force.

[0007] The loading and unloading device with the above configuration realizes simultaneous lifting of multiple expansion pieces at a time, greatly saves the change time, realizes quick change, and does not require manual handling of the operator compared with the existing operation method, completely eliminates the safety risk of manual handling, and improves the safety.

[0008] Preferably, at least two gourd-shaped holes are formed on the bottom plate in an axial through manner and are arranged in a circumferential interval, the gourd-shaped holes are the same in number as the expansion pieces and correspond to the threaded hole positions on each expansion piece, the gourd-shaped hole comprises a large hole and a small hole which are communicated, the gourd-shaped hole is designed to allow the step part of the step screw to pass through the large hole of the corresponding gourd-shaped hole from the axial direction below when the step screw is screwed into the threaded hole of the corresponding expansion piece, and further, when the bottom plate is rotated around the axis of the tube expander core in a first direction, the screw rod of the step screw is allowed to enter the small hole from the large hole of the corresponding gourd-shaped hole, wherein the small hole of the gourd-shaped hole does not allow the step part of the corresponding step screw to pass through in the axial direction.

[0009] By means of the dismounting device with the above configuration, only a small angle of rotation is required during use to complete the dismounting, and the operation is simple and fast.

[0010] Preferably, the dismounting device further comprises a top plate, the top plate is fixedly connected to the bottom plate from the axial upper side by means of a first spacer which is the same in number as the gourd-shaped holes and corresponds in position.

[0011] Preferably, the first spacer is positioned near the transition region between the large hole and the small hole of the corresponding gourd-shaped hole, a limiting recess which is open towards the corresponding gourd-shaped hole is formed on the first spacer, wherein after the dismounting device is assembled with the tube expander, there is a first axial gap between the top surface of the step screw and the upper surface of the limiting recess.

[0012] By means of the limiting recess provided on the first spacer, it can be forewarned whether the connection between the step screw and the expansion piece is loose, when there is a loose step screw, the loose step screw will block the first spacer and thereby prevent the rotation of the bottom plate, so that the bottom plate cannot be connected with each expansion piece together, and the hoisting cannot be completed, thereby avoiding the falling accident of the expansion piece caused by the loosening of the screw during hoisting.

[0013] Preferably, the dismounting device comprises a first rotation stopping assembly, the first rotation stopping assembly comprises a first shaft rod part and a first locking part located at the axial lower end of the first shaft rod part, the first shaft rod part is attached to the top plate in a manner that can move in the axial direction relative to the top plate, at least two gourd-shaped holes comprise a first gourd-shaped hole and a second gourd-shaped hole, the first locking part is positioned axially above the large hole of the first gourd-shaped hole and can fall into and completely occupy the large hole of the first gourd-shaped hole under the action of gravity.

[0014] Preferably, the loading and unloading device comprises a second rotation-stopping assembly, the second rotation-stopping assembly comprising a second shaft rod part and a second locking part located at an axial lower end of the second shaft rod part, the second shaft rod part being attached to the top plate in a manner that it can move axially relative to the top plate, the second locking part being positioned axially above the large hole of the second gourd-shaped hole and being able to fall into and completely occupy the large hole of the second gourd-shaped hole under the action of gravity.

[0015] Preferably, first and second through holes are formed in the top plate, respectively above the large hole of the first gourd-shaped hole and the large hole of the second gourd-shaped hole, the first and second shaft rod parts passing through the first and second through holes, wherein the first through hole does not allow the first locking part to pass through, and the second through hole does not allow the second locking part to pass through.

[0016] Preferably, the first rotation-stopping assembly further comprises a first holding element, and the second rotation-stopping assembly further comprises a second holding element, the first and second holding elements being threadedly connected to the top ends of the first and second shaft rod parts, respectively, from above the top plate, wherein the first through hole does not allow the first holding element to pass through, and the second through hole does not allow the second holding element to pass through.

[0017] Preferably, the first and second gourd-shaped holes are arranged substantially 180 degrees apart in the circumferential direction of the bottom plate.

[0018] The first and second rotation-stopping assemblies described above can prevent the bottom plate from performing an undesired reverse rotation relative to the pipe-expanding core during hoisting, thereby effectively preventing the bottom plate from being disconnected from the expansion sheet due to reverse rotation of the bottom plate during hoisting.

[0019] Preferably, the loading and unloading device further comprises at least three second spacers fixedly connected to the bottom plate from the axial lower side and arranged at intervals in the circumferential direction of the bottom plate, wherein, after the loading and unloading device is assembled with the pipe expander, the second spacers can abut against the top end surface of the pipe-expanding core to define a second axial gap between the bottom plate and the pipe-expanding core.

[0020] Preferably, in the case where the expansion sheet comprises an axial flange at the upper axial end surface of the expansion sheet, the axial dimension of the second axial gap is greater than the axial dimension of the axial flange of the expansion sheet.

[0021] By providing the second spacers, the axial flange of the expansion sheet is prevented from exerting friction on the bottom surface of the bottom plate, thereby interfering with the arrangement and positioning of the bottom plate.

[0022] Preferably, the handling device further comprises a retaining ring fixedly connected to the bottom plate from below in the axial direction, which is designed to be conformably sleeved on the upper shaft end of the tube expanding mandrel after the handling device is assembled to the tube expanding mandrel, so as to limit the radial displacement of each expansion sheet.

[0023] By arranging the retaining ring, each step screw can be quickly inserted into the corresponding gourd-shaped hole during the connection of the bottom plate and the expansion sheet, and the radial displacement of each expansion sheet can be prevented during hoisting, so that the tube expanding mandrel is more easily and stably landed in the base.

[0024] Preferably, the retaining tool is a rotating lifting ring, which is directly mounted to the top plate.

[0025] Preferably, the first direction is counterclockwise.

[0026] Preferably, the handling device further comprises a base. BRIEF DESCRIPTION OF DRAWINGS

[0027] The foregoing and other features and characteristics of the present application will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate by way of example only. The same reference numbers in different drawings designate the same elements. In the drawings:

[0028] Figure 1 A perspective view of a tube expanding mandrel is shown.

[0029] Figure 2 An axial exploded view of a handling device according to the present application is shown.

[0030] Figure 3 A schematic view of the arrangement relationship between a first spacer and a first step screw is shown.

[0031] Figure 4 A top view of a bottom plate is shown.

[0032] Figure 5 A perspective view of a bottom plate viewed from below is shown.

[0033] Figure 6 A schematic view of a first assembly state of a handling device according to the present application after being assembled to a tube expanding mandrel is shown.

[0034] Figure 7 A schematic view of a second assembly state of a handling device according to the present application after being assembled to a tube expanding mandrel is shown.

[0035] REFERENCE LIST

[0036] 1. expansion core; 11. first expansion sheet; 12. second expansion sheet; 13. axial flange; 14. threaded hole; 2. first stepped screw; 21. shank of first stepped screw; 22. stepped portion of first stepped screw; 3. bottom plate; 31. first gourd-shaped hole; 311. large hole of first gourd-shaped hole; 312. small hole of first gourd-shaped hole; 32. second gourd-shaped hole; 321. large hole of second gourd-shaped hole; 322. small hole of second gourd-shaped hole; 4. top plate; 41. first through hole; 42. second through hole; 5. first spacer; 51.

[0037] limiting recess; 6. first anti-rotation assembly; 61. first shaft rod portion; 62. first locking portion; 63. first holding element; 7. second anti-rotation assembly; 71. second shaft rod portion; 72. second locking portion; 73. second holding element; 8. second spacer; 9. retaining ring; 10. rotating lifting ring; 101. base; L. axial; R. radial; D1. first axial gap; A. first direction. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present application will now be described in detail in connection with the accompanying drawings. The following description is merely exemplary in nature and is not intended to limit the present application and its applications or uses.

[0039] Figure 1 A perspective view of an expansion core 1 of an expansion machine in the prior art is shown. The expansion core 1 is configured to include eight expansion sheets that collectively enclose a cylindrical expansion core 1, and a pipe to be processed can be sleeved on the outer periphery of the eight expansion sheets. The eight expansion sheets include, for example, a first expansion sheet 11 and a second expansion sheet 12.

[0040] In the prior art, a threaded hole 14 is formed at the upper axial end face of each expansion sheet. When hoisted using external hoisting equipment (such as a crane), the hoisting mechanism of the crane can be screwed into the threaded hole of the expansion sheet to achieve connection with the expansion sheet. In addition, an axial flange 13 extending upward in the axial direction is also provided at the upper axial end face of each expansion sheet, which can be used for attachment with a traction device (not shown in the drawings).

[0041] Figure 2The axial exploded schematic view of the loading and unloading device according to the present application is shown in the figure. The loading and unloading device is assembled to the tube expanding mandrel 1 from the axial upper side to subsequently transport the tube expanding mandrel 1. The loading and unloading device is configured to mainly include eight stepped screws, a base plate 3 and a holding tool. When the loading and unloading device is assembled to the tube expanding mandrel 1, the eight stepped screws 2 are screwed into the threaded holes 14 of the eight expansion pieces one by one, thereby being fixedly connected to each of the expansion pieces by means of the threaded connection. The base plate 3 is designed to be detachably connected to the eight stepped screws simultaneously. The holding tool is directly or indirectly coupled to the base plate 3. The holding tool can be hooked or held by an external hoisting device or a human hand to drive the holding tool to move. The holding tool drives the base plate 3 to displace and indirectly drives the eight expansion pieces to displace simultaneously. In this context, the holding tool can adopt various commercially available holding tools, and preferably adopts a rotating lifting ring 10. The loading and unloading device can include a base 101 designed for the tube expanding mandrel 1 to be placed thereon to facilitate the installation and removal of the base plate and the expansion pieces.

[0042] In this context, the stepped screw screwed into the threaded hole 14 of the first expansion piece 11 is referred to as the first stepped screw 2. In combination with the above-mentioned Figure 3 , the first stepped screw 2 includes a screw rod 21 and a stepped portion 22 protruding radially from the outer circumferential surface of the screw rod 21, so that the stepped portion 22 has a larger diameter than the screw rod 21. The first stepped screw 2 is connected to the corresponding expansion piece by the screw rod 21. The configurations of the other stepped screws are completely identical to that of the first stepped screw 2.

[0043] The configuration of the base plate 3 will be introduced below in combination with Figure 2 , Figure 4 and Figure 5 , wherein Figure 4 a top view of the base plate 3 is shown, Figure 5 a perspective view of the base plate 3 is shown from the lower side. The base plate 3 is generally designed to be circular or annular. Corresponding to the number of expansion pieces and the number of stepped screws, eight gourd-shaped holes axially extending through the base plate 3 are provided on the base plate 3. The eight gourd-shaped holes are arranged at intervals along the circumference of the base plate 3, and during the assembly of the loading and unloading device to the tube expanding mandrel 1, the base plate 3 is rotated so that the eight gourd-shaped holes can be located one by one above the eight stepped screws to subsequently allow the eight stepped screws to pass through the eight gourd-shaped holes correspondingly. The eight gourd-shaped holes, for example, include a first gourd-shaped hole 31 and a second gourd-shaped hole 32 arranged at an interval of 180° along the circumference, wherein the first gourd-shaped hole 32 is for the first stepped screw 2 to pass through, and the second gourd-shaped hole 32 is for the second stepped screw to pass through which is threadedly connected to the second expansion piece 12, and so on. The eight gourd-shaped holes are respectively used for the eight stepped screws to pass through.

[0044] The configuration of the first calabash-shaped hole 31 will be described below. The first calabash-shaped hole 31 comprises a large hole 311 and a small hole 312 which are in communication with each other. The size of the large hole 311 is designed to allow the step portion 22 of the first step screw 2 to pass therethrough, specifically, in the case where the large hole 311 is a circular hole, the diameter of the large hole 311 is designed to be larger than the diameter of the step portion 22 of the first step screw 2. The size of the small hole 312 is designed to allow the shank 21 of the first step screw 2 to pass therethrough, but not to allow the step portion 22 of the first step screw 2 to pass therethrough in the axial direction L. Thus, when the first step screw 2 is inserted into the small hole 312 of the first calabash-shaped hole 31, the area on the base plate 3 beside the small hole 312 of the first calabash-shaped hole 31 will prevent the step portion 22 of the first step screw 2 from being displaced downward in the axial direction L. Further, the relative positional relationship between the large hole 311 and the small hole 312 of the first calabash-shaped hole 31 is designed to allow the shank 21 of the first step screw 2 to smoothly enter the small hole 312 from the large hole 311 of the first calabash-shaped hole 31 when the base plate 3 is rotated relative to the expansion tube core 1 about the axis of the expansion tube core 1. Note here that, during the rotation of the base plate 3, the first step screw 2 should move in an arcuate trajectory relative to the first calabash-shaped hole 31, with the base plate 3 as the reference.

[0045] After the first step screw 2 enters the small hole 312 from the large hole 311 of the first calabash-shaped hole 31, when an axial upward force is applied to the base plate 3, the lower end surface of the step portion 22 of the first step screw 2 will abut against the base plate 3, which will drive the axial movement of the first step screw 2 and further drive the movement of the first expansion sheet 11 in the axial direction L.

[0046] The configurations of the other calabash-shaped holes are identical to that of the first calabash-shaped hole 31. After the base plate 3 is rotated so that the eight step screws all enter the small holes from the large holes of the corresponding calabash-shaped holes, the connection between the base plate 3 and the expansion sheets is completed, at which time driving the movement of the base plate 3 can simultaneously drive the movement of the eight expansion sheets, and the hoisting operation can be performed next.

[0047] Although not shown herein, it should be understood by those skilled in the art that the base plate 3 can also have other configurations. For example, circular through holes corresponding to the threaded holes 14 of the expansion sheets can be formed on the base plate, the through holes only allowing the shanks of the step screws to pass therethrough, and the eight step screws can be threadedly connected to the corresponding expansion sheets after passing through the through holes on the base plate. Although this arrangement requires each step screw to be screwed one by one during coupling and disassembly, which is not as convenient as rotating the base plate for the calabash-shaped holes, it can still achieve the purpose of the present application.

[0048] Continuing to refer to Figure 2The loading and unloading device can further comprise a top plate 4 and a first spacer 5. The top plate 4 is arranged axially above the bottom plate 3, and the rotating hanger 10 described above can be directly connected to the top plate 4 from the axial direction. The first spacer 5 is clamped between the bottom plate 3 and the top plate 4, and the axial upper end and the axial lower end of the first spacer 5 are fixedly connected to the top plate 4 and the bottom plate 3 respectively, so that the top plate 4 is fixedly connected to the bottom plate 3 by means of the first spacer 5. The first spacer 5 forms an axial spacing between the top plate 4 and the bottom plate 3, and the step screw can be accommodated between the bottom plate and the top plate 4 after passing through the corresponding gourd-shaped hole from the axial direction below.

[0049] Further, the first spacer 5 is also designed to warn whether the threaded connection between each step screw and the corresponding expansion sheet is loose. Specifically, in the case of eight gourd-shaped holes being opened on the bottom plate, the loading and unloading device is also designed to include eight first spacers 5. The eight first spacers 5 are arranged one by one axially above the eight gourd-shaped holes, and are specifically positioned near the transition area between the large hole and the small hole of the corresponding gourd-shaped hole.

[0050] Figure 3 It is also shown in FIG. 1 that the corresponding first spacer 5 is positioned above the first gourd-shaped hole 31, and the first spacer 5 is designed in the shape of a h, and a limiting recess 51 is opened on it towards the first gourd-shaped hole 31. When the bottom plate 3 rotates relative to the tube expanding core 1, the first step screw 2 must pass through the limiting recess 51 of the corresponding first spacer 5 before it can enter the small hole 312 from the large hole 311 of the first gourd-shaped hole 31 or vice versa.

[0051] Further, there is a first axial gap D1 between the top surface of the first step screw 2 and the upper surface of the limiting recess 51 of the corresponding first spacer 5. D1 is preferably located in the range of 1 to 3 mm, and is particularly preferably located in the range of 2 to 3 mm. Through this design, when the threaded connection between the first step screw 2 and the first expansion sheet 11 is loose, the first step screw 2 will be displaced axially L upwards, and after being displaced by, for example, 1 to 3 mm, the first step screw 2 cannot pass through the limiting recess 51 in the corresponding first spacer 5. In this case, when the bottom plate 3 is driven to rotate relative to the tube expanding core 1, for example, in the first direction A as shown in FIG. 2 around the axis of the tube expanding core, the loose first step screw 2 will prevent the corresponding first spacer 5 from rotating, at which time the bottom plate 3 cannot be smoothly rotated, i.e., cannot be assembled with the tube expanding core, and the operator will realize that there is a problem of loose connection of the first step screw 2. The structural arrangement relationship of the other step screws and the corresponding first spacers 5 is the same as that of the first step screw 2.

[0052] With the above design, when one or more of the stepped screws have a loose connection, the stepped screw will block the base plate 3 and prevent it from rotating smoothly. As a result, all the stepped screws cannot enter the corresponding small hole from the corresponding large hole, that is, the connection between the base plate and the expansion plate cannot be completed, and the expansion tube core 1 cannot be hoisted. This also avoids the risk of hoisting and falling due to loose screws from the very beginning.

[0053] See also Figure 2 The loading and unloading device is configured to further include a first anti-rotation assembly 6. The first anti-rotation assembly 6 includes a first gripping element 63, a first shaft portion 61, and a first locking portion 62. A first through hole 41 is provided in the top plate 4 for the first shaft portion 61 to pass through. The first through hole 41 is sized to be slightly larger than the maximum radial dimension of the first shaft portion 61, but smaller than the maximum radial dimension of the first gripping element 63 and the first locking portion 62, thereby allowing the first shaft portion 61 to move freely axially about the top plate 4 within the first through hole 41, but preventing the first gripping element 63 and the first locking portion 62 from entering the first through hole 41, thus preventing the first anti-rotation assembly 6 from disengaging from the top plate 4.

[0054] In this document, the first anti-rotation component 6 is arranged axially above the first gourd-shaped hole 31. Specifically, the first locking part 62 is positioned at least axially above the large hole 311 of the first gourd-shaped hole 31. Preferably, the first through hole 41 is arranged axially above the large hole 311 of the first gourd-shaped hole 31, so that the entire first anti-rotation component 6 is located axially above the large hole 311 of the first gourd-shaped hole 31. The axial length of the first shaft part 61 and / or the first locking part 62 is designed such that the first locking part 62 can fall into the large hole 311 of the first gourd-shaped hole 31 during the axial downward movement of the first shaft part 61 and the first locking part 62 about the top plate 4 under their own weight, wherein, after the first locking part 62 falls into the large hole 311 of the first gourd-shaped hole 31, the first locking part 62 can completely occupy the large hole 311 of the first gourd-shaped hole 31.

[0055] The first gripping element 63 is fixedly connected from the axially upper side of the top plate 4 to the axially upper end of the first shaft portion 61, preferably by a threaded connection. When the operator grips the first gripping element 63 and pulls it further in the axially upward direction, the first locking part 62 can move axially upward and thus disengage from the large hole 311 of the first gourd-shaped hole 31.

[0056] As can be seen from the above description, when the first step screw 2 enters the small hole 312 of the first calabash-shaped hole 31 from the large hole 311, the first locking portion 62 can quickly fall into the large hole 311 of the first calabash-shaped hole 31 under the action of gravity and occupy the large hole 311, which can effectively prevent the bottom plate 3 from rotating relative to the tube expanding mandrel 1 in the direction opposite to the first direction A during hoisting, and the first locking portion 62 prevents the first step screw 2 from returning from the small hole 312 to the large hole 311 of the first calabash-shaped hole 31, thereby preventing the bottom plate 3 from being disconnected from the first expansion sheet 11 and other expansion sheets.

[0057] In this embodiment, in order to further enhance the anti-reverse rotation function, the loading and unloading device is configured to further include a second anti-rotation assembly 7. For reference, see Figure 2 and Figure 6 Similar to the configuration of the first anti-rotation assembly 6, the second anti-rotation assembly 7 includes a second holding element 73, a second shaft portion 71, and a second locking portion 72. A second through hole 42 is formed in the top plate 4 to allow the second shaft portion 71 to pass therethrough. The second through hole 42 allows the second shaft portion 71 to move axially freely within the second through hole 42 relative to the top plate 4, but does not allow the second holding element 73 and the second locking portion 72 to enter the second through hole 42, thereby preventing the second anti-rotation assembly 7 from being disconnected from the top plate 4.

[0058] Unlike the first anti-rotation assembly 6, in this embodiment, the second locking portion 72 is positioned axially above the large hole 321 of the second calabash-shaped hole 32. In particular, the second through hole 42 is positioned axially above the large hole 321 of the second calabash-shaped hole 32. The axial length of the second shaft portion 71 and / or the second locking portion 72 is also designed similarly to allow the second locking portion 72 to fall into the large hole 321 of the second calabash-shaped hole 32 and fully occupy the large hole 321 during the axial downward movement of the second shaft portion 71 and the second locking portion 72 relative to the top plate 4 under their own gravity. The second holding element 73 is threadedly connected to the axially upper end of the second shaft portion 71.

[0059] By adding the above-mentioned second anti-rotation assembly 7, the anti-reverse rotation of the bottom plate 3 relative to the tube expanding mandrel 1 can be further prevented by preventing the corresponding step screw passing through the second calabash-shaped hole 32 from entering the large hole 321 from the small hole 322 of the second calabash-shaped hole 32 during hoisting. In addition, the operator can drive the rotation of the bottom plate 3 relative to the tube expanding mandrel 1 by simultaneously holding the above-mentioned first holding element 63 and the second holding element 73. The two holding elements 63, 73 arranged at an interval of 180° facilitate hand gripping and force exertion.

[0060] As shown in Figure 2 The loading and unloading device can further include a retaining ring 9. The retaining ring 9 is connected to the bottom plate 3 from the axial lower side, and is attached to the outer peripheral section of the bottom plate 3 in particular. After the loading and unloading device is fitted to the tube expanding mandrel 1, the retaining ring 9 can be fitted around the outer periphery of the entire tube expanding mandrel 1 (as shown inFigure 6 and 7 the case shown in Figure 1 ). By setting the retaining ring, it can help the individual step screws to quickly enter the corresponding calabash-shaped holes during the process of connecting the bottom plate with the expansion pieces, and in addition, it can prevent the individual expansion pieces from being undesirably displaced along the radial direction R during hoisting, and it is easier to make the entire expander core 1 stably land into the base 101 as shown in

[0061] Referring again to Figure 5 , the handling device can further include a second spacer 8 fixedly connected to the lower axial end face of the bottom plate 3. The second spacers 8 are arranged along the circumference of the bottom plate 3 at intervals, preferably at equal intervals. After the handling device is assembled to the expander core 1, the bottom plate 3 will be supported at the top ends of the three expansion pieces by means of the above-mentioned second spacers 8. Although four second spacers 8 are shown in Figure 5 , it should be understood by those skilled in the art that stable support of the bottom plate 3 can be ensured as long as at least three second spacers 8 are provided.

[0062] In the case where the expansion pieces have axial flanges 13 as shown in Figure 1 , the axial dimension of the second spacers 8 is designed to be greater than the axial dimension of the axial flanges 13, so as to prevent the axial flanges 13 of the individual expansion pieces from exerting friction on the bottom surface of the bottom plate, thereby interfering with the movement or arrangement of the bottom plate 3.

[0063] The following describes the operation steps of using the handling device according to the present application to handle the expander core 1 as shown in Figure 2 , Figure 6 and Figure 7 . Figure 1

[0064] Step 1, screw the eight step screws one by one into the threaded holes 14 of the eight expansion pieces.

[0065] Step 2, the operator places the bottom plate 3 on the top end of the expander core 1 by holding the rotating lifting ring 10 or directly carrying, etc., and in this process, the position of the bottom plate 3 is adjusted so that the individual calabash-shaped holes opened thereon are located above the axial direction of the corresponding step screws, so that when the bottom plate 3 is arranged in place with respect to the expander core 1, the step portions of the individual step screws can pass through the large holes of the corresponding calabash-shaped holes from the axial direction below.

[0066] Figure 6 shows the state that the individual step screws have passed through the large holes of the corresponding calabash-shaped holes, which is referred to herein as the first assembly state. From Figure 6 ​In the first assembly state, the first step screw 2 will lift the first anti-rotation assembly 6 from the axial direction after passing through the large hole 311 of the first gourd-shaped hole, at this time the first locking part 62 will not fall into the large hole 311 of the first gourd-shaped hole 31, and the first locking part 62 has no effect on the rotation of the bottom plate 3. Similarly, although not shown, the second anti-rotation assembly 7 is also lifted by the corresponding step screw passing through the second gourd-shaped hole 32, so it also does not fall into the large hole 321 of the second gourd-shaped hole 32. It should be noted here that in the first assembly state, the bottom plate 3 can still be separated from the expansion tube core 1 by axially pulling the rotating lifting ring 10.

[0067] Step 3, the operator holds the first holding element 63 and the second holding element 73 with both hands, rotates the top plate 4 along the direction of the first direction A, and thereby drives the bottom plate 3 to rotate along the direction of the first direction A. Taking the first step screw 2 as an example, during the rotation of the bottom plate 3 along the arrow A, the first step screw 2 will enter the small hole 312 from the large hole 311 of the first gourd-shaped hole 31, that is, it has come to Figure 7 The second assembly state is shown. In this second assembly state, since the step part of each step screw cannot pass through the small hole of the gourd-shaped hole, when the bottom plate 3 is subsequently pulled in the axial upward direction, the bottom plate 3 will drive the step screw and thereby drive each expansion piece to shift.

[0068] After the operator converts from the first assembly state to the second assembly state, the operator can release the first holding element 63 and the second holding element 73, and the first locking part 62 will fall under the action of gravity after losing the support of the first step screw 2 and enter the large hole 311 of the first gourd-shaped hole 31 to occupy the large hole 311. The movement of the second anti-rotation assembly 7 is the same as that of the first anti-rotation assembly 6. In this case, even if an external force is applied to the bottom plate 3 in the direction opposite to the first direction A, the bottom plate 3 cannot rotate relative to the expansion tube core 1 in the direction opposite to the first direction A, which makes it impossible for each step screw to return from the small hole of the corresponding gourd-shaped hole to the large hole. This ensures that during hoisting, the step screw will not be disconnected from the bottom plate 3 due to the undesired reverse rotation of the bottom plate.

[0069] Step 4, use manpower or equipment such as a crane to lift the dismounting device and the expansion tube core 1 together by pulling / hooking the rotating lifting ring 10, and move them to the desired position.

[0070] Step 5, dismount the dismounting device from the expansion tube core 1. Specifically, refer to Figure 7, the operator holds the first holding element 63 and the second holding element 73 again and pulls them axially until the first locking portion 62 and the second locking portion 72 are out of the first gourd-shaped hole 31 and the second gourd-shaped hole 32. Next, the operator still holds the first holding element 63 and the second holding element 73 and rotates the top plate 4 in the orientation opposite to the first direction A until the step screw is back into the large hole from the small hole of the corresponding gourd-shaped hole, i.e. back to Figure 6 The first assembly state is shown. In this case, the first holding element 63 and the second holding element 73 are continuously pulled upward to disconnect the other components of the dismounting device from the tube expanding mandrel 1 except for the eight step screws. After the above steps are completed, the eight step screws can be optionally retained on the corresponding expansion blades to facilitate the next use.

[0071] By using the dismounting device with the above configuration, the technical purpose of hoisting multiple expansion blades at one time is achieved, the changeover time is saved, the production efficiency is improved, and the risk of the operator taking with hands is reduced. Further, the dismounting device is simple to operate, and in the process of assembling the dismounting device to the tube expanding mandrel, only a small angle (an angle allowing the step screw to enter the small hole from the large hole) of the bottom plate needs to be rotated, and the dismounting process is similar, and the operation steps are simple.

[0072] In this article, although the step screw, the gourd-shaped hole, the first spacer and other related components are all exemplified by providing eight, but those skilled in the art should understand that the number of the above components corresponds to the number of the expansion blades of the tube expanding mandrel, and the position of the gourd-shaped hole also corresponds to the position of the threaded hole on each expansion blade. Assuming that the tube expanding mandrel only includes two expansion blades, then only two step screws can be provided and correspondingly only two gourd-shaped holes are provided on the bottom plate. In addition, the included angle between the first gourd-shaped hole and the second gourd-shaped hole is not necessarily 180°, which can be set according to the number of gourd-shaped holes and the operation habit of the operator.

[0073] In addition, although the first direction A is counterclockwise, but those skilled in the art should understand that the first direction A can also adopt clockwise, at this time only the positions of the large hole and the small hole of each gourd-shaped hole are correspondingly interchanged.

[0074] The preferred embodiments according to the present application are described above in combination with specific embodiments. It can be understood that the above description is only exemplary and not limiting, and those skilled in the art can think of various modifications and changes with reference to the above description without departing from the scope of the present application. These modifications and changes are also included in the protection scope of the present application.

Claims

1. A loading and unloading device for a tube expander, the loading and unloading device being used to transport a cylindrical tube expander core (1) composed of at least two expander plates, wherein each expander plate has a threaded hole for loading and unloading at its upper shaft end face, characterized in that, The loading and unloading device includes: At least two stepped screws, each stepped screw including a screw and a stepped portion that protrudes radially from the outer peripheral surface of the screw, the stepped screws being able to be screwed into the threaded holes of the expansion plate in a one-to-one correspondence; Base plate (3), said base plate (3) being configured to allow all said stepped screws to be simultaneously and detachably attached to said base plate (3); and A retaining tool is designed to be connected to the base plate and to move the base plate (3) under the drive of an external force.

2. The loading and unloading device according to claim 1, characterized in that, At least two gourd-shaped holes are provided on the base plate (3) that are axially through and circumferentially spaced. The number of gourd-shaped holes is the same as that of the expansion plates and corresponds to the position of the threaded holes on each expansion plate. The gourd-shaped holes include a large hole and a small hole that are connected. The gourd-shaped holes are designed such that when the stepped screw is screwed into the threaded hole of the corresponding expansion plate, the stepped part of the stepped screw can pass through the large hole of the corresponding gourd-shaped hole from the axial direction. Furthermore, when the base plate (3) is rotated about the axis of the expansion tube core in a first direction, the screw of the stepped screw can enter the small hole from the large hole of the corresponding gourd-shaped hole. The small hole of the gourd-shaped hole does not allow the stepped part of the corresponding stepped screw to pass through axially.

3. The loading and unloading device according to claim 2, characterized in that, The loading and unloading device also includes a top plate (4), which is fixedly connected axially upward to the bottom plate (3) by means of a first spacer (5) that has the same number and position as the gourd-shaped holes.

4. The loading and unloading device according to claim 3, characterized in that, The first spacer (5) is positioned near the transition area between the large hole and the small hole of the corresponding gourd-shaped hole. A limiting recess (51) is provided on the first spacer (5) that opens toward the corresponding gourd-shaped hole. After the loading and unloading device is assembled with the expansion tube core (1), there is a first axial gap (D1) between the top surface of the stepped screw and the upper surface of the limiting recess (51).

5. The loading and unloading device according to claim 3, characterized in that, The loading and unloading device includes a first anti-rotation component (6), which includes a first shaft portion (61) and a first locking portion (62) located at the axially lower end of the first shaft portion (61). The first shaft portion (61) is attached to the top plate (4) in a manner that allows it to move axially relative to the top plate (4). At least two gourd-shaped holes include a first gourd-shaped hole (31) and a second gourd-shaped hole (32). The first locking portion (62) is positioned axially above the large hole (311) of the first gourd-shaped hole and is able to fall into and completely occupy the large hole (311) of the first gourd-shaped hole under the action of gravity.

6. The loading and unloading device according to claim 5, characterized in that, The loading and unloading device includes a second anti-rotation assembly (7), which includes a second shaft portion (71) and a second locking portion (72) located at the axially lower end of the second shaft portion (71). The second shaft portion (71) is attached to the top plate (4) in a manner that allows it to move axially relative to the top plate (4). The second locking portion (72) is positioned axially above the large hole (321) of the second gourd-shaped hole and is able to fall into and completely occupy the large hole (321) of the second gourd-shaped hole under the action of gravity.

7. The loading and unloading device according to claim 6, characterized in that, The top plate (4) is provided with a first through hole (41) and a second through hole (42) located axially above the large hole (311) of the first gourd-shaped hole and the large hole (321) of the second gourd-shaped hole, respectively. The first shaft part (61) and the second shaft part (71) pass through the first through hole (41) and the second through hole (42). The first through hole (41) does not allow the first locking part (62) to pass through, and the second through hole (42) does not allow the second locking part (72) to pass through.

8. The loading and unloading device according to claim 7, characterized in that, The first anti-rotation assembly (6) further includes a first gripping element (63), and the second anti-rotation assembly (7) further includes a second gripping element (73). The first gripping element (63) and the second gripping element (73) are threadedly connected from above the top plate (4) to the top end of the first shaft portion (61) and the top end of the second shaft portion (71), respectively. The first through hole (41) does not allow the first gripping element (63) to pass through, and the second through hole (42) does not allow the second gripping element (73) to pass through.

9. The loading and unloading device according to any one of claims 5 to 8, characterized in that, The first gourd-shaped hole (31) and the second gourd-shaped hole (32) are arranged on the base plate (3) at approximately 180-degree intervals along the circumference.

10. The loading and unloading device according to any one of claims 1 to 8, characterized in that, The loading and unloading device further includes at least three second spacers (8) that are fixedly connected to the base plate (3) from the axial direction downward and are arranged circumferentially at intervals along the base plate (3), wherein, after the loading and unloading device is assembled with the expansion core (1), the second spacers (8) can abut against the top surface of the expansion core (1) to define a second axial gap between the base plate (3) and the expansion core (1).

11. The loading and unloading device according to claim 10, characterized in that, When the expansion plate includes an axial flange (13) located at the upper axial end face of the expansion plate, the axial dimension of the second axial gap is greater than the axial dimension of the axial flange (13) of the expansion plate.

12. The loading and unloading device according to any one of claims 1 to 8, characterized in that, The loading and unloading device also includes a retaining ring (9) fixedly connected to the base plate (3) from the axial direction downward. The retaining ring (9) is designed to be conformally fitted onto the upper shaft end of the expansion core (1) after the loading and unloading device is assembled with the expansion core (1) to limit the radial displacement of each of the expansion plates.

13. The loading and unloading device according to any one of claims 3 to 8, characterized in that, The retaining tool is a rotating lifting ring (10), which is directly installed on the top plate (4).

14. The loading and unloading device according to any one of claims 2 to 8, characterized in that, The first direction (A) is counterclockwise.

15. The loading and unloading device according to claim 1, characterized in that, The loading and unloading device also includes a base (101).

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