Limiting tool of corrugated expander

Abstract

The utility model relates to a limiting tool of a corrugated expander. The limiting tool comprises a main body part, a first supporting part and a first connecting part. The oil injection tool has the advantages that the expander is finally filled with oil along with gradual increase of the oil injection amount, and the expander is always subjected to uniform downward tension due to limitation of the tool, so that the expander cannot continuously expand to generate irreversible deformation damage in the continuous oil injection process; in addition, the limiting tool has the advantages of being high in working efficiency, high in stability, convenient to maintain and high in flexibility, and can be widely applied to oil injection of the mutual inductor with the corrugated expander and maintenance work under specific conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of mutual inductor oil filling and maintenance, in particular to a position limiting tool for a corrugated expander. Background Art

[0002] As one of the key components of the transformer, the expander is actually an elastic element. When the volume of the transformer oil in the transformer changes due to temperature changes, the volume of the expander body changes accordingly, playing a role in volume compensation. It ensures that the oil in the transformer does not come into contact with the air and reduces transformer oil aging. As long as the expander is selected correctly, the internal pressure of the transformer can be kept basically unchanged within the specified measurement change range, reducing the occurrence of transformer accidents.

[0003] In order to ensure that the transformer body insulation paper fully absorbs the continuous immersion of transformer oil, the expander height needs to be kept in a natural state and continue to be replenished during the transformer oil filling and subsequent static storage process (generally lasting several days to dozens of days); in addition, when repairing or replacing the secondary sealing components at the bottom of the transformer, the equipment needs to be inverted. At this time, the expander will be stretched too much or even damaged due to the internal pressure. In order to ensure that the equipment is in a safe state during the maintenance process, it is necessary to limit the height of the expander to an appropriate position when the equipment is inverted.

[0004] At present, during the oil filling and subsequent static storage of the transformer, as well as the maintenance or replacement of the secondary sealing components at the bottom of the transformer, it is necessary to manually lift and operate the metal corrugated sheet expander current transformer. This process is not only complicated to operate and has low work efficiency, but also requires a lot of manpower and material resources, which increases the labor intensity of the staff. In addition, the metal corrugated sheet expander current transformer is heavy. If there is a slight slackness during the lifting process, the equipment will fall, which is very dangerous.

[0005] At present, no effective solution has been proposed for the problems existing in the relevant technologies, such as complex operation, low work efficiency, and the need to spend a lot of manpower and material resources, which increases the labor intensity of the staff. Utility Model Content

[0006] The purpose of the utility model is to provide a limit fixture for a corrugated expander in view of the deficiencies in the prior art, so as to solve the problems existing in the related technology, such as complex operation, low working efficiency, large amount of manpower and material resources, and increased labor intensity of the staff.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] The utility model provides a position limiting tool for a corrugated expander, comprising:

[0009] A main body component, wherein the main body component is used to install components;

[0010] a first supporting member, which is disposed at any end of the main body member and is telescopically connected to the main body member and is used to support the corrugated expander;

[0011] A first connecting component is provided on the first supporting component and is used for detachably connecting the first supporting component to the corrugated expander.

[0012] In some of the embodiments, the main body component includes:

[0013] A main body, the main body being used for mounting the first supporting member;

[0014] An internal thread is formed on the inner wall of the main body and is used for threaded connection with the first supporting component.

[0015] In some embodiments, the first supporting member comprises:

[0016] a first connecting rod, wherein a first end of the first connecting rod is threadedly connected to the main body component;

[0017] A first supporting plate is disposed at the second end of the first connecting rod and is used to support the corrugated expander.

[0018] In some embodiments, the first support plate further comprises:

[0019] a first anti-slip structure, wherein the first anti-slip structure is formed on a surface of the first support plate and is used to increase friction between the first support plate and the corrugated expander;

[0020] A plurality of first connection holes are provided in the first supporting plate and are used for the first connection components to pass through.

[0021] In some embodiments, the first connecting member includes:

[0022] A plurality of first positioning members, which are arranged on the first supporting member and are embedded and connected with the through holes at the edge of the corrugated expander to position the first supporting member;

[0023] A plurality of first connecting members are respectively and sequentially passed through corresponding through holes on the edge of the corrugated expander and the corresponding first positioning members, and are threadedly connected with the first supporting member.

[0024] In some of the embodiments, it also includes:

[0025] a second supporting member, which is disposed at the other end of the main body member and is telescopically connected to the main body member and is used to support the corrugated expander;

[0026] A second connecting component is provided on the second supporting component and is used for detachably connecting the second supporting component to the corrugated expander.

[0027] In some embodiments, the second supporting member comprises:

[0028] a second connecting rod, a first end of which is threadedly connected to the main body component;

[0029] A second supporting plate member is disposed at the second end of the second connecting rod member and is used to support the corrugated expander.

[0030] In some embodiments, the second support plate further comprises:

[0031] a second anti-slip structure, wherein the second anti-slip structure is formed on a surface of the second support plate and is used to increase friction between the second support plate and the corrugated expander;

[0032] A plurality of second connection holes are provided in the second supporting plate for allowing the second connection components to pass through.

[0033] In some embodiments, the second connecting member includes:

[0034] A plurality of second positioning members, which are arranged on the second supporting member and embedded in and connected with the through holes at the edge of the corrugated expander, and are used to position the second supporting member;

[0035] A plurality of second connecting members are respectively and sequentially passed through corresponding through holes on the edge of the corrugated expander and corresponding second positioning members, and are threadedly connected with the second supporting member.

[0036] The utility model adopts the above technical solution, and compared with the prior art, has the following technical effects:

[0037] The utility model provides a limit fixture for a corrugated expander. As the oil injection amount gradually increases, the expander is finally filled with oil. Due to the limitation of the fixture, the expander is always subjected to a uniform downward pulling force. Therefore, during the continuous oil injection process, the expander will not continue to expand and be irreversibly deformed and damaged. In addition, the limit fixture in the utility model has the advantages of high working efficiency, high stability, convenient maintenance and strong flexibility, and can be widely used in the oil injection of mutual inductors with corrugated expanders and maintenance work under specific conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 1 is a schematic diagram of a position limiting tool according to an embodiment of the utility model;

[0039] Figure 2 is a schematic diagram of a first supporting component according to an embodiment of the utility model (I);

[0040] Figure 3 is a schematic diagram of a first supporting component according to an embodiment of the utility model (II);

[0041] Figure 4 is a schematic diagram of a first connecting component according to an embodiment of the utility model;

[0042] Figure 5 2 is a schematic diagram of a position limiting tool according to an embodiment of the utility model;

[0043] Figure 6 is a schematic diagram of a second supporting member according to an embodiment of the utility model (I);

[0044] Figure 7 is a schematic diagram of a second supporting component according to an embodiment of the utility model (II);

[0045] Figure 8 It is a schematic diagram of a second connecting component according to an embodiment of the utility model.

[0046] The reference numerals are: 100, main body component;

[0047] 200, first supporting member; 210, first connecting rod; 220, first supporting plate; 221, first connecting hole;

[0048] 300, first connecting member; 310, first positioning member; 320, first connecting member;

[0049] 400, second supporting member; 410, second connecting rod; 420, second supporting plate; 421, second connecting hole;

[0050] 500, second connecting member; 510, second positioning member; 520, second connecting member. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0052] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0053] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0054] Example 1

[0055] An illustrative embodiment of the present utility model is as follows: Figure 1 As shown, a position limiting fixture for a corrugated expander includes a main body component 100, a first supporting component 200 and a first connecting component 300. The main body component 100 is used to install components; the first supporting component 200 is arranged at any end of the main body component 100 and is telescopically connected to the main body component 100 to support the corrugated expander; the first connecting component 300 is arranged on the first supporting component 200 to detachably connect the first supporting component 200 to the corrugated expander.

[0056] like Figure 1 As shown, the main body 100 includes a main body and a threaded hole. The main body is used to install the first support component 200; the internal thread is formed inside the main body for threaded connection with the first support component 200.

[0057] Specifically, the main body is arranged in a hollow rod structure, and the first end of the main body can abut against the edge of the lower edge of the corrugated expander, and the second end of the main body can be telescopically connected to the first support component 200; it should be noted that the first end and the second end of the main body are respectively the two ends in its length direction.

[0058] In some of these embodiments, the body member includes, but is not limited to, a metal conduit.

[0059] Specifically, the internal thread is formed on the inner wall of the main body, and the internal thread is arranged along the length direction of the main body, that is, the length of the internal thread on the inner wall of the main body is the same as the length of the main body.

[0060] like Figure 2 and Figure 3 As shown, the first support component 200 includes a first connecting rod 210 and a first supporting plate 220. The first end of the first connecting rod 210 is threadedly connected to the main component 100; the first supporting plate 220 is disposed at the second end of the first connecting rod 210 for supporting the corrugated expander.

[0061] Specifically, the first connecting rod 210 is arranged in a round rod structure, the first end of the first connecting rod 210 extends into the interior of the main body, and the outer wall of the first connecting rod 210 has an external thread, so that the first connecting rod 210 can be threadedly connected to the main body, and the second end of the first connecting rod 210 is connected to the first support plate 220; it should be noted that the first end and the second end of the first connecting rod 210 are respectively the two ends in its length direction.

[0062] In some embodiments, the first connecting rod 210 includes but is not limited to a metal rod.

[0063] Specifically, the first support plate 220 is arranged in an arc-shaped plate structure, and the first support plate 220 is connected to the second end of the first connecting rod 210 by welding, riveting or bolting, and the end face of the first support plate 220 can abut against the edge position of the upper edge of the corrugated expander, thereby supporting the corrugated expander.

[0064] In some embodiments, the first support plate 220 includes but is not limited to a metal plate.

[0065] Furthermore, the first support plate 220 further includes a first anti-slip structure and a plurality of first connection holes 221. The first anti-slip structure is formed on the surface of the first support plate 220 to increase the friction between the first support plate 220 and the corrugated expander; and the plurality of first connection holes 221 are provided in the first support plate 220 to allow the first connection member 300 to pass through.

[0066] Specifically, the first anti-slip structure is formed on the surface where the first support plate 220 abuts against the upper edge of the corrugated expander and completely covers the surface, so as to increase the friction between the first support plate 220 and the upper edge of the corrugated expander and improve the abutment stability.

[0067] In some embodiments, the first anti-slip structure includes but is not limited to anti-slip grooves.

[0068] Specifically, the first connection hole 221 is arranged in a circular hole structure, the axial direction of the first connection hole 221 is arranged vertically, and a plurality of first connection holes 221 are arranged at intervals along the arc direction of the first support plate 220; it should be noted that the first connection hole 221 allows the first connection component 300 to pass through.

[0069] More specifically, the number of the first connection holes 221 is two, and the two first connection holes 221 are spaced apart along the arc direction of the first support plate 220 .

[0070] In some of the embodiments, the number of the first connection holes 221 may be 1, 3, etc., that is, the number of the first connection holes 221 may be set according to actual needs, and no excessive restrictions are made herein.

[0071] like Figure 4 As shown, the first connecting member 300 includes a plurality of first positioning members 310 and a plurality of first connecting members 320. Among them, the plurality of first positioning members 310 are arranged on the first supporting member 200, and are embedded and connected with the through holes at the edge of the corrugated expander, so as to position the first supporting member 200; the plurality of first connecting members 320 respectively pass through the corresponding through holes at the edge of the corrugated expander and the corresponding first positioning members 310 in sequence, and are threadedly connected with the first supporting member 200.

[0072] Specifically, the first positioning member 310 is arranged in a hollow cylindrical structure, and the first positioning member 310 is fixedly installed on the first support plate 220 by welding, riveting or bolts, and the first positioning member 310 is coaxially arranged with the first connecting hole 221; it should be noted that the first positioning member 310 can be embedded in the corresponding through hole on the edge position of the corrugated expander, so as to realize the positioning of the first support plate 220.

[0073] In some of the embodiments, the first positioning member 310 includes but is not limited to a metal cylinder.

[0074] More specifically, the number of the first positioning members 310 is two, and the two first positioning members 310 are respectively located at positions of the corresponding first connecting holes 221 on the first supporting plate 220 .

[0075] In some of the embodiments, the number of the first positioning members 310 matches the number of the first connecting holes 221 ; it should be understood that the number of the first positioning members 310 is the same as the number of the first connecting holes 221 .

[0076] Specifically, the first connecting member 320 passes through the corresponding through holes on the edge of the corrugated expander and the corresponding first positioning member 310 in sequence, and is threadedly connected to the first supporting plate 220, thereby fixing the first supporting plate 220 and the corrugated expander.

[0077] In some embodiments, the first connecting member 320 includes but is not limited to a bolt.

[0078] More specifically, the number of the first connecting members 320 is two, and the two first connecting members 320 respectively pass through the corresponding first positioning members 310 and are threadedly connected to the first supporting plate 220 .

[0079] In some of the embodiments, the number of the first connecting members 320 matches the number of the first connecting holes 221 ; it should be understood that the number of the first connecting members 320 is the same as the number of the first connecting holes 221 .

[0080] The method of using this embodiment is as follows:

[0081] (I) Oil injection operation

[0082] In actual work, first confirm the natural height of the expander;

[0083] Then, the length of the first connecting rod 210 extending out of the main body is adjusted by rotating the main body, thereby adjusting the height of the overall limiting fixture so that the height of the limiting fixture is consistent with the height of the expander;

[0084] Then, the bolts are passed through the through holes on the lower edge of the expander and connected with the first end bolts of the main body, and the first connecting member 320 is sequentially corrugated to the corresponding through holes on the edge of the expander and the corresponding first positioning member 310, and is threadedly connected with the first supporting plate 220;

[0085] Finally, in the same manner, four limit fixtures are installed around the expander.

[0086] (ii) Replacement or repair work

[0087] After completing the oil filling operation, turn the transformer upside down, at which time the expander is at the bottom. After removing and replacing the secondary sealing components of the transformer, place it upright, and the expander is at the highest position again. Finally, remove the four limit fixtures used to fix the expander.

[0088] The advantage of this embodiment is that as the oil injection amount gradually increases, the expander is eventually filled with oil. Due to the limitation of the tooling, the expander is always subjected to a uniform downward pulling force. Therefore, during the continuous oil injection process, the expander will not continue to expand and suffer irreversible deformation and damage. In addition, the limiting tooling in the utility model has the advantages of high work efficiency, high stability, convenient maintenance and strong flexibility, and can be widely used in the oil injection of mutual inductors with corrugated expanders and maintenance work under specific conditions.

[0089] Example 2

[0090] This embodiment is a variation of the first embodiment, and further includes a second supporting component 400 and a second connecting component 500 .

[0091] like Figure 5 As shown, a position limiting tool for a corrugated expander also includes a second supporting component 400 and a second connecting component 500. The second supporting component 400 is arranged at the other end of the main component 100 and is telescopically connected to the main component 100 to support the corrugated expander; the second connecting component 500 is arranged on the second supporting component 400 to detachably connect the second supporting component 400 to the corrugated expander.

[0092] like Figure 6 and Figure 7 As shown, the second support component 400 includes a second connecting rod 410 and a second supporting plate 420. The first end of the second connecting rod 410 is threadedly connected to the main component 100; the second supporting plate 420 is disposed at the second end of the second connecting rod 410 for supporting the corrugated expander.

[0093] Specifically, the second connecting rod 410 is arranged in a round rod structure, the first end of the second connecting rod 410 extends into the interior of the main body, and the outer wall of the second connecting rod 410 has an external thread, so that the second connecting rod 410 can be threadedly connected to the main body, and the second end of the second connecting rod 410 is connected to the second support plate 420; it should be noted that the first end and the second end of the second connecting rod 410 are respectively the two ends in its length direction.

[0094] In some embodiments, the second connecting rod 410 includes but is not limited to a metal rod.

[0095] Specifically, the second support plate 420 is arranged in an arc-shaped plate structure, and the second support plate 420 is connected to the second end of the second connecting rod 410 by welding, riveting or bolting, and the end face of the second support plate 420 can abut against the edge position of the upper edge of the corrugated expander, thereby supporting the corrugated expander.

[0096] In some embodiments, the second support plate 420 includes but is not limited to a metal plate.

[0097] Furthermore, the second support plate 420 further includes a second anti-slip structure and a plurality of second connection holes 421. The second anti-slip structure is formed on the surface of the second support plate 420 to increase the friction between the second support plate 420 and the corrugated expander; and the plurality of second connection holes 421 are provided in the second support plate 420 to allow the second connection member 500 to pass through.

[0098] Specifically, the second anti-slip structure is formed on the surface where the second support plate 420 abuts against the upper edge of the corrugated expander and completely covers the surface, so as to increase the friction between the second support plate 420 and the upper edge of the corrugated expander and improve the abutment stability.

[0099] In some embodiments, the second anti-slip structure includes but is not limited to anti-slip grooves.

[0100] Specifically, the second connection hole 421 is arranged in a circular hole structure, the axial direction of the second connection hole 421 is arranged vertically, and a plurality of second connection holes 421 are arranged at intervals along the arc direction of the second support plate 420; it should be noted that the second connection hole 421 allows the second connection component 500 to pass through.

[0101] More specifically, the number of the second connection holes 421 is two, and the two second connection holes 421 are spaced apart along the arc direction of the second support plate 420 .

[0102] In some of the embodiments, the number of the second connection holes 421 may be 1, 3, etc., that is, the number of the second connection holes 421 may be set according to actual needs, and no excessive restrictions are made herein.

[0103] like Figure 8 As shown, the second connecting member 500 includes a plurality of second positioning members 510 and a plurality of second connecting members 520. Among them, the plurality of second positioning members 510 are arranged on the second supporting member 400, and are embedded and connected with the through holes at the edge of the corrugated expander, so as to position the second supporting member 400; the plurality of second connecting members 520 respectively pass through the corresponding through holes at the edge of the corrugated expander and the corresponding second positioning members 510 in sequence, and are threadedly connected with the second supporting member 400.

[0104] Specifically, the second positioning member 510 is arranged in a hollow cylindrical structure, and the second positioning member 510 is fixedly installed on the second support plate 420 by welding, riveting or bolts, and the second positioning member 510 and the second connecting hole 421 are arranged coaxially; it should be noted that the second positioning member 510 can be embedded in the corresponding through hole on the edge position of the corrugated expander, so as to realize the positioning of the second support plate 420.

[0105] In some of the embodiments, the second positioning member 510 includes but is not limited to a metal cylinder.

[0106] More specifically, the number of the second positioning members 510 is two, and the two second positioning members 510 are respectively located at positions of the corresponding second connecting holes 421 on the second supporting plate 420 .

[0107] In some of the embodiments, the number of the second positioning members 510 matches the number of the second connection holes 421 ; it should be understood that the number of the second positioning members 510 is the same as the number of the second connection holes 421 .

[0108] Specifically, the second connecting member 520 passes through the corresponding through holes on the edge of the corrugated expander and the corresponding second positioning member 510 in sequence, and is threadedly connected to the second supporting plate 420, thereby fixing the second supporting plate 420 and the corrugated expander.

[0109] In some embodiments, the second connecting member 520 includes but is not limited to a bolt.

[0110] More specifically, the number of the second connecting members 520 is two, and the two second connecting members 520 respectively pass through the corresponding second positioning members 510 and are threadedly connected to the second supporting plate 420 .

[0111] In some of the embodiments, the number of the second connecting members 520 matches the number of the second connecting holes 421 ; it should be understood that the number of the second connecting members 520 is the same as the number of the second connecting holes 421 .

[0112] The method of using this embodiment is as follows:

[0113] (I) Oil injection operation

[0114] In actual work, first confirm the natural height of the expander;

[0115] Subsequently, the length of the first connecting rod 210 and the second connecting rod 410 extending out of the main body is adjusted by rotating the main body, thereby adjusting the height of the overall limiting fixture so that the height of the limiting fixture is consistent with the height of the expander;

[0116] Then, the second connecting member 520 is passed through the through hole on the lower edge of the expander and the corresponding second positioning member 510 in sequence, and is bolted to the second support plate 420. The first connecting member 320 is passed through the corresponding through hole on the edge of the corrugated expander and the corresponding first positioning member 310 in sequence, and is threaded to the first support plate 220.

[0117] Finally, in the same manner, four limit fixtures are installed around the expander.

[0118] (ii) Replacement or repair work

[0119] After completing the oil filling operation, turn the transformer upside down, at which time the expander is at the bottom. After removing and replacing the secondary sealing components of the transformer, place it upright, and the expander is at the highest position again. Finally, remove the four limit fixtures used to fix the expander.

[0120] The advantages of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0121] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0122] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A position limiting device for a corrugated expander, characterized in that: include: A main body component, wherein the main body component is used to install components; a first supporting member, which is disposed at any end of the main body member and is telescopically connected to the main body member and is used to support the corrugated expander; A first connecting component is provided on the first supporting component and is used for detachably connecting the first supporting component to the corrugated expander.

2. The position limiting tooling according to claim 1, characterized in that: The main body component comprises: A main body, the main body being used for mounting the first supporting member; An internal thread is formed on the inner wall of the main body and is used for threaded connection with the first supporting component.

3. The position limiting tool according to claim 1, characterized in that: The first supporting member comprises: a first connecting rod, wherein a first end of the first connecting rod is threadedly connected to the main body component; A first supporting plate is disposed at the second end of the first connecting rod and is used to support the corrugated expander.

4. The position limiting tooling according to claim 3, characterized in that: The first supporting plate also includes: a first anti-slip structure, wherein the first anti-slip structure is formed on a surface of the first support plate and is used to increase friction between the first support plate and the corrugated expander; A plurality of first connection holes are provided in the first supporting plate and are used for the first connection components to pass through.

5. The position limiting tooling according to claim 1, characterized in that: The first connecting component comprises: A plurality of first positioning members, which are arranged on the first supporting member and are embedded and connected with the through holes at the edge of the corrugated expander to position the first supporting member; A plurality of first connecting members are respectively and sequentially passed through corresponding through holes on the edge of the corrugated expander and the corresponding first positioning members, and are threadedly connected with the first supporting member.

6. The position limiting tool according to claim 1, characterized in that: Also includes: a second supporting member, which is disposed at the other end of the main body member and is telescopically connected to the main body member and is used to support the corrugated expander; A second connecting component is provided on the second supporting component and is used for detachably connecting the second supporting component to the corrugated expander.

7. The position limiting tool according to claim 6, characterized in that: The second supporting member comprises: a second connecting rod, a first end of which is threadedly connected to the main body component; A second supporting plate member is disposed at the second end of the second connecting rod member and is used to support the corrugated expander.

8. The position limiting tool according to claim 7, characterized in that: The second supporting plate also includes: a second anti-slip structure, wherein the second anti-slip structure is formed on a surface of the second support plate and is used to increase friction between the second support plate and the corrugated expander; A plurality of second connection holes are provided in the second supporting plate for allowing the second connection components to pass through.

9. The position limiting tool according to claim 6, characterized in that: The second connecting component comprises: A plurality of second positioning members, which are arranged on the second supporting member and embedded in and connected with the through holes at the edge of the corrugated expander, and are used to position the second supporting member; A plurality of second connecting members are respectively and sequentially passed through corresponding through holes on the edge of the corrugated expander and corresponding second positioning members, and are threadedly connected with the second supporting member.

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