CN117566630A - Auxiliary lifting tool for universal oil metal expander - Google Patents

Auxiliary lifting tool for universal oil metal expander Download PDF

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Publication number
CN117566630A
CN117566630A CN202311536622.1A CN202311536622A CN117566630A CN 117566630 A CN117566630 A CN 117566630A CN 202311536622 A CN202311536622 A CN 202311536622A CN 117566630 A CN117566630 A CN 117566630A
Authority
CN
China
Prior art keywords
auxiliary tool
metal expander
rod
auxiliary
tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311536622.1A
Other languages
Chinese (zh)
Inventor
曾俊龙
孙敏
程实
彭宇锋
何林芝
冯麒铭
魏川翔
曹江陵
胡炳林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Sichuan Electric Power Co Ltd
Original Assignee
State Grid Sichuan Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Sichuan Electric Power Co Ltd filed Critical State Grid Sichuan Electric Power Co Ltd
Priority to CN202311536622.1A priority Critical patent/CN117566630A/en
Publication of CN117566630A publication Critical patent/CN117566630A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/065Scissor linkages, i.e. X-configuration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/28Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

The invention relates to the technical field of transformer substation maintenance equipment, in particular to an auxiliary lifting tool of a general oil metal expander, which comprises the following components: when the auxiliary tool I and the auxiliary tool II are used, the auxiliary tool I and the auxiliary tool II are respectively arranged at two sides of the metal expander, the lower end of the auxiliary tool I and the lower end of the auxiliary tool II are attached to the mounting surface of the metal expander, and the upper end of the auxiliary tool is clamped at the upper end of the metal expander; the auxiliary tool moves up the upper end of the metal expander; according to the invention, the auxiliary tool I and the auxiliary tool II are arranged, and upward acting force is applied to the upper ends of the metal expanders through the auxiliary tool I and the auxiliary tool II, so that two workers can finish lifting of the metal expanders, and meanwhile, the lifting height of the metal expanders can be accurately controlled by adjusting the upward moving distance of the auxiliary tool, so that the frequency of transferring tools up and down in high-altitude operation is reduced.

Description

Auxiliary lifting tool for universal oil metal expander
Technical Field
The invention relates to the technical field of transformer substation maintenance equipment, in particular to an auxiliary lifting tool of a general oil metal expander.
Background
When the transformer substation operation maintenance personnel find that the oil level of the general oil immersed current transformer is low, the oil level defect treatment is required to be carried out in order not to influence the continuous and stable operation of equipment. In the treatment process, the working flows of reaching the station, manually lifting, oiling, manually reducing, exhausting and evacuating to the ground are sequentially unfolded.
In the oil supplementing process, the internal vacuum degree of the oil immersed type current transformer is higher, the oil immersed type current transformer is high-place operation, no better stress and force applying point exists, and the traditional current transformer oil supplementing work generally needs 3 workers to conduct simultaneously. For safety reasons, safety belts cannot be beaten on the porcelain insulator of the current transformer in high-altitude operation, workers can only be sent to an operation site by using the high-altitude operation vehicle, and only two workers can be carried in the arm, so that the challenge is brought to the processing of low-defect oil level processing of the current transformer. The staff often can't even application of force in operation (tensile, reduce metal expander) in-process, can not only lead to the oiling back exhaust not thoroughly to influence current transformer and show "false oil level", still probably causes serious threat to electric wire netting safe and stable operation.
Disclosure of Invention
The invention aims to provide an auxiliary lifting tool for a general oil metal expander, which has the advantages of high requirement on workers for manual lifting, low efficiency, poor quality and the like, so that the number of transposition times in the high-altitude operation process is small, and the controllability in the overhaul operation is high.
The invention is realized by the following technical scheme:
a universal oil metal expander auxiliary lifting tool comprising: the auxiliary tool I and the auxiliary tool II are respectively arranged at two sides of the metal expander when the metal expander is used, the lower end of the auxiliary tool I and the lower end of the auxiliary tool II are attached to the mounting surface of the metal expander, the upper end of the auxiliary tool I is clamped at the upper end of the metal expander, and the upper end of the auxiliary tool II is clamped at the upper end of the metal expander;
the upper end of the first auxiliary tool and the upper end of the second auxiliary tool apply upward acting force to the upper end of the metal expander and enable the upper end of the metal expander to move upwards.
Optionally, the upward moving direction of the upper end of the first auxiliary tool is parallel to the central axis of the metal expander;
the upward moving direction of the upper end of the second auxiliary tool is parallel to the central axis of the metal expander.
Optionally, a connection line between the upper end of the first auxiliary tool and the upper end of the second auxiliary tool intersects with the central axis of the metal expander.
Specifically, the first auxiliary tool/the second auxiliary tool include: the metal expander comprises a bottom supporting block, a lifting assembly, a top supporting block and a fixing piece, wherein two ends of the lifting assembly are respectively connected with the bottom supporting block and the top supporting block, the fixing piece is fixedly connected with the top supporting block, and the fixing piece is clamped to the upper end of the metal expander.
Specifically, the lifting assembly includes: the lower end of the first lower rod and the lower end of the second lower rod are hinged to two ends of the bottom supporting block respectively, the upper end of the first upper rod and the upper end of the second upper rod are hinged to two ends of the top supporting block respectively, the upper end of the first lower rod is connected with the lower end of the first upper rod in a rotating mode through the manual driving assembly, and the upper end of the second lower rod is connected with the lower end of the second upper rod in a rotating mode through the manual driving assembly.
Optionally, the first lower rod, the second lower rod, the first upper rod and the second upper rod are located the coplanar, be provided with first contained angle between the first lower rod and the first upper rod, the second lower rod with be provided with the second contained angle between the second upper rod, first contained angle with the second contained angle sets up relatively, and through manual drive assembly changes first contained angle with the size of second contained angle.
Optionally, the manual driving assembly includes: the novel hinge comprises a first hinge block, a second hinge block, a double-head screw and a rotating connecting rod, wherein the first hinge block is provided with a first threaded hole, the second hinge block is provided with a second threaded hole, the first threaded hole and the second threaded hole are respectively connected with two sections of external threads of the double-head screw, the rotating connecting rod is connected with one end of the double-head screw, the upper end of a first lower rod and the lower end of a first upper rod are hinged with the first hinge block, and the upper end of a second lower rod and the lower end of a second upper rod are hinged with the second hinge block.
Specifically, the double-end screw rod level sets up, first screw hole with the equal level of second screw hole sets up, the opposite direction of screwing of two sections external screw threads of double-end screw rod, the internal thread of first screw hole with the internal thread of second screw hole respectively with the both ends external screw thread adaptation of double-end screw rod.
Optionally, the fixed end of the rotating connecting rod is rotatably connected with one end of the double-end screw rod through a rotating shaft, and the central axis of the rotating shaft is perpendicular to the central axis of the double-end screw rod.
Specifically, the maximum upward movement distance of the first auxiliary tool and the second auxiliary tool is not smaller than the maximum upward movement height of the metal expander, and the maximum height of the first auxiliary tool and the second auxiliary tool is not smaller than the maximum height of the metal expander.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, the auxiliary tool I and the auxiliary tool II are arranged, and upward acting force is applied to the upper ends of the metal expanders through the auxiliary tool I and the auxiliary tool II, so that two workers can finish lifting of the metal expanders, and meanwhile, the lifting height of the metal expanders can be accurately controlled by adjusting the upward moving distance of the auxiliary tool, so that the frequency of transferring tools up and down in high-altitude operation is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a top view of a universal oil metal expander assist lifting tool in use according to the present invention.
Fig. 2 is a front view of a universal oil metal expander assist lifting tool according to the present invention.
Reference numerals: 100-a metal expander, 101-an auxiliary tool I and 102-an auxiliary tool II;
the device comprises a 1-bottom supporting block, a 2-top supporting block, a 3-fixing piece, a 4-first lower rod, a 5-second lower rod, a 6-first upper rod, a 7-second upper rod, an 8-first hinging block, a 9-second hinging block, a 10-double-head screw rod and an 11-rotating connecting rod.
Detailed Description
The present invention will be described in further detail with reference to the drawings and embodiments, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent. It is to be understood that the specific embodiments described herein are merely illustrative of the substances, and not restrictive of the invention.
It should be further noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Embodiments of the present invention and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
Under the general condition, three excessive maintenance personnel are needed in the oil level low defect treatment process of the oil immersed type current transformer, and as the aerial working vehicle cannot be used quickly, only two persons can be carried in the aerial working vehicle arm, the number of defect treatment personnel is reduced, and the working efficiency is improved. In the oil level low defect treatment of the oil immersed current transformer based on the transformer substation, the metal expander 100 in the current transformer needs to be lifted, compressed and the like. Because of the special environment with the electrified periphery in the transformer substation, the defect processing time is reduced as much as possible, and the working efficiency is improved.
As shown in fig. 1, there is provided a general-purpose oil metal expander 100 auxiliary lifting tool, comprising: when the auxiliary tool I101 and the auxiliary tool II 102 are used, the auxiliary tool I101 and the auxiliary tool II 102 are respectively arranged on two sides of the metal expander 100, the lower end of the auxiliary tool I101 and the lower end of the auxiliary tool II 102 are attached to the mounting surface of the metal expander 100, the upper end of the auxiliary tool I101 is clamped at the upper end of the metal expander 100, and the upper end of the auxiliary tool II 102 is clamped at the upper end of the metal expander 100;
the upper end of the first auxiliary tool 101 and the upper end of the second auxiliary tool 102 exert upward force on the upper end of the metal expander 100 and move the upper end of the metal expander 100 upward.
In order to avoid tilting of the metal expander 100 during the lifting process, the upward moving direction of the upper end of the first auxiliary tool 101 is set to be parallel to the central axis of the metal expander 100; the upward moving direction of the upper end of the second auxiliary tool 102 is parallel to the central axis of the metal expander 100.
The line between the upper end of the first auxiliary tool 101 and the upper end of the second auxiliary tool 102 intersects the central axis of the metal expander 100.
Through setting up appurtenance one 101 and appurtenance two 102, when using, an appurtenance is controlled to two staff alone to make appurtenance one 101 and appurtenance two 102 exert effort to metal expander 100 in step, pull-up for traditional manpower, can effectually shorten the oil-filled type current transformer's time of mending, shorten to within 20 minutes from original more than 30 minutes, single-phase current transformer saves about 10 minutes, and single interval power failure carries out the work of mending oil and can save about 30 minutes. The external power failure time is reduced, the power supply reliability is improved, and the method has important significance for maintaining good social and economic order and guaranteeing the power supply and distribution safety and has remarkable social benefit.
Example two
As shown in fig. 2, the specific structures of the first auxiliary tool 101 and the second auxiliary tool 102 are described in this embodiment, and the first auxiliary tool 101 and the second auxiliary tool 102 adopt the same structural features, and the difference is only that the mounting positions are different.
The first auxiliary tool 101/the second auxiliary tool 102 includes: the bottom support block 1, lifting assembly, top supporting shoe 2 and stationary blade 3, lifting assembly's both ends are connected in bottom support block 1 and top supporting shoe 2 respectively, stationary blade 3 and top supporting shoe 2 fixed connection, and the upper end of stationary blade 3 block to metal expander 100. The fixing piece 3 is an arc-shaped card matched with the gap of the metal expander 100, and the arc-shaped card is clamped in the gap of the metal expander 100, so that the contact area of the fixing piece 3 can be increased, and a more stable acting force is provided for the metal expander 100.
The relative position between the bottom support block 1 and the top support block 2 can be changed by a lifting assembly, thereby lifting the metal expander 100, the lifting assembly comprising: the lower end of the first lower rod 4 and the lower end of the second lower rod 5 are respectively hinged at two ends of the bottom supporting block 1, the upper end of the first upper rod 6 and the upper end of the second upper rod 7 are respectively hinged at two ends of the top supporting block 2, the upper end of the first lower rod 4 is rotationally connected with the lower end of the first upper rod 6 through the manual driving assembly, and the upper end of the second lower rod 5 is rotationally connected with the lower end of the second upper rod 7 through the manual driving assembly.
The first lower rod 4, the second lower rod 5, the first upper rod 6 and the second upper rod 7 are located on the same plane, a first included angle is formed between the first lower rod 4 and the first upper rod 6, a second included angle is formed between the second lower rod 5 and the second upper rod 7, the first included angle and the second included angle are oppositely arranged, and the size of the first included angle and the second included angle is changed through the manual driving assembly.
That is, the first and second angles are changed by the manual driving assembly, and when the first and second angles are smaller, the distance between the bottom supporting block 1 and the top supporting block 2 is smaller. When the first included angle and the second included angle are increased, the top supporting block 2 moves upwards relative to the bottom supporting block 1, so that the purpose of jacking is achieved.
Providing a structure of a manual drive assembly, the manual drive assembly comprising: the first hinge piece 8, the second hinge piece 9, double-end screw rod 10 and rotation connecting rod 11, first hinge piece 8 is provided with first screw hole, second hinge piece 9 is provided with the second screw hole, first screw hole and second screw hole are in the two sections external screw thread threaded connection of double-end screw rod 10 respectively, rotation connecting rod 11 is connected with the one end of double-end screw rod 10, the upper end of first lower extreme 4 and the lower extreme of first upper bar 6 all articulate with first hinge piece 8, the upper end of second lower bar 5 and the lower extreme of second upper bar 7 all articulate with second hinge piece 9.
The double-end screw rod 10 level sets up, and first screw hole and second screw hole all level set up, and the spiral direction of two sections external screw threads of double-end screw rod 10 is opposite, and the internal thread of first screw hole and the internal thread of second screw hole respectively with the both ends external screw thread adaptation of double-end screw rod 10. The fixed end of the rotary connecting rod 11 is rotatably connected with one end of the double-end screw 10 through a rotary shaft, and the central axis of the rotary shaft is perpendicular to the central axis of the double-end screw 10.
The double-ended screw rod 10 with opposite thread options is arranged, the double-ended screw rod 10 is rotated by rotating the connecting rod 11, so that the relative positions of the first hinging block 8/the second hinging block 9 and the double-ended screw rod 10 are changed, the first hinging block 8 and the second hinging block 9 synchronously move, and when the first hinging block 8 and the second hinging block 9 move towards the two ends of the double-ended screw rod 10, the top supporting block 2 moves downwards. The top support block 2 moves up as the first 8 and second 9 hinge blocks move towards the midpoint of the double-ended screw 10.
In actual work, two staff slowly rotate the rotary connecting rod 11, after the fixing piece 3 is clamped with the metal expander 100, unscrew the oil injection valve at the top of the metal expander 100, rotate the rotary connecting rod 11 again, lift the metal expander 100 to the target height, and finally inject oil.
In addition, the maximum upward movement distance of the first auxiliary tool 101 and the second auxiliary tool 102 is not less than the maximum upward movement height (16.5 cm) of the metal expander 100, and the maximum height of the first auxiliary tool 101 and the second auxiliary tool 102 is not less than the maximum height (30 cm) of the metal expander 100.
By setting the pitch of the screw thread, the time required for rotating the rotation link 111 for a turn is less than 5s, and the telescoping speed of the auxiliary tool is ensured to be greater than 0.0375cm/s.
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the present application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
It will be appreciated by persons skilled in the art that the above embodiments are provided for clarity of illustration only and are not intended to limit the scope of the invention. Other variations or modifications of the above-described invention will be apparent to those of skill in the art, and are still within the scope of the invention.

Claims (10)

1. A universal oil metal expander auxiliary lifting tool, comprising: the auxiliary tool I (101) and the auxiliary tool II (102) are respectively arranged at two sides of the metal expander (100) when the metal expander is used, the lower end of the auxiliary tool I (101) and the lower end of the auxiliary tool II (102) are attached to the mounting surface of the metal expander (100), the upper end of the auxiliary tool I (101) is clamped at the upper end of the metal expander (100), and the upper end of the auxiliary tool II (102) is clamped at the upper end of the metal expander (100);
the upper end of the first auxiliary tool (101) and the upper end of the second auxiliary tool (102) apply upward acting force to the upper end of the metal expander (100) and enable the upper end of the metal expander (100) to move upwards.
2. A universal oil metal expander auxiliary lifting tool as claimed in claim 1, wherein the upward direction of the upper end of the auxiliary tool one (101) is parallel to the central axis of the metal expander (100);
the upward moving direction of the upper end of the second auxiliary tool (102) is parallel to the central axis of the metal expander (100).
3. A universal oil metal expander auxiliary lifting tool as claimed in claim 2, wherein a line between an upper end of the first auxiliary tool (101) and an upper end of the second auxiliary tool (102) intersects a central axis of the metal expander (100).
4. A universal oil metal expander auxiliary lifting tool as claimed in claim 1, wherein said auxiliary tool one (101)/said auxiliary tool two (102) comprises: bottom sprag piece (1), lifting unit, top supporting shoe (2) and stationary blade (3), lifting unit's both ends respectively in bottom sprag piece (1) with top supporting shoe (2) are connected, stationary blade (3) with top supporting shoe (2) fixed connection, stationary blade (3) block to the upper end of metal expander (100).
5. The auxiliary lifting tool for a universal oil metal expander of claim 4, wherein said lifting assembly comprises: the lower end of the first lower rod (4) and the lower end of the second lower rod (5) are hinged to two ends of the bottom supporting block (1), the upper end of the first upper rod (6) and the upper end of the second upper rod (7) are hinged to two ends of the top supporting block (2), the upper end of the first lower rod (4) is connected with the lower end of the first upper rod (6) in a rotating mode through the manual driving assembly, and the upper end of the second lower rod (5) is connected with the lower end of the second upper rod (7) in a rotating mode through the manual driving assembly.
6. The auxiliary lifting tool for the universal oil metal expander according to claim 5, wherein the first lower rod (4), the second lower rod (5), the first upper rod (6) and the second upper rod (7) are located on the same plane, a first included angle is formed between the first lower rod (4) and the first upper rod (6), a second included angle is formed between the second lower rod (5) and the second upper rod (7), the first included angle and the second included angle are arranged oppositely, and the sizes of the first included angle and the second included angle are changed through the manual driving assembly.
7. The universal oil metal expander auxiliary lifting tool of claim 6, wherein said manual drive assembly comprises: first articulated piece (8), second articulated piece (9), double-end screw rod (10) and rotation connecting rod (11), first articulated piece (8) are provided with first screw hole, second articulated piece (9) are provided with the second screw hole, first screw hole with the second screw hole respectively in two sections external screw thread threaded connection of double-end screw rod (10), rotation connecting rod (11) with the one end of double-end screw rod (10) is connected, the upper end of first lower limb (4) with the lower extreme of first upper limb (6) all with first articulated piece (8) articulates, the upper end of second lower limb (5) with the lower extreme of second upper limb (7) all with second articulated piece (9) articulates.
8. The auxiliary lifting tool for the universal oil metal expander, as set forth in claim 7, wherein the double-ended screw (10) is horizontally disposed, the first threaded hole and the second threaded hole are horizontally disposed, the directions of rotation of the two external threads of the double-ended screw (10) are opposite, and the internal threads of the first threaded hole and the internal threads of the second threaded hole are respectively matched with the external threads of the two ends of the double-ended screw (10).
9. The auxiliary lifting tool for the universal oil metal expander according to claim 7, wherein the fixed end of the rotating connecting rod (11) is rotatably connected with one end of the double-ended screw (10) through a rotating shaft, and the central axis of the rotating shaft is perpendicular to the central axis of the double-ended screw (10).
10. A universal oil metal expander auxiliary lifting tool as claimed in claim 1, wherein the maximum upward displacement distance of said first auxiliary tool (101) and said second auxiliary tool (102) is not less than the maximum elevation height of said metal expander (100), and the maximum heights of said first auxiliary tool (101) and said second auxiliary tool (102) are not less than the maximum height of said metal expander (100).
CN202311536622.1A 2023-11-17 2023-11-17 Auxiliary lifting tool for universal oil metal expander Pending CN117566630A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311536622.1A CN117566630A (en) 2023-11-17 2023-11-17 Auxiliary lifting tool for universal oil metal expander

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311536622.1A CN117566630A (en) 2023-11-17 2023-11-17 Auxiliary lifting tool for universal oil metal expander

Publications (1)

Publication Number Publication Date
CN117566630A true CN117566630A (en) 2024-02-20

Family

ID=89892963

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311536622.1A Pending CN117566630A (en) 2023-11-17 2023-11-17 Auxiliary lifting tool for universal oil metal expander

Country Status (1)

Country Link
CN (1) CN117566630A (en)

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