CN110125865B - Device with range finding, fixed force and install and remove accurate taper sleeve - Google Patents
Device with range finding, fixed force and install and remove accurate taper sleeve Download PDFInfo
- Publication number
- CN110125865B CN110125865B CN201910400444.7A CN201910400444A CN110125865B CN 110125865 B CN110125865 B CN 110125865B CN 201910400444 A CN201910400444 A CN 201910400444A CN 110125865 B CN110125865 B CN 110125865B
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- 210000004907 gland Anatomy 0.000 claims abstract description 89
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 2
- 230000003116 impacting effect Effects 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electric Cable Installation (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention discloses a device with a distance measuring, force fixing and precise taper sleeve assembling and disassembling functions, which comprises a taper sleeve, wherein the upper surface and the lower surface of the taper sleeve are provided with a gland, the gland comprises an upper gland and a lower gland, lightening holes are uniformly distributed on the gland, the edge of the upper gland is provided with radial symmetrical notches, the gland is provided with corresponding positioning rabbets, a central rod is connected between the glands and is in a stepped shape, and weights are arranged on the central rod of the upper gland in a sliding manner. The invention combines the upper gland, the lower gland, the center rod, the weight, the fixing nut and the taper sleeve into a whole, thereby solving the problem of installing and taking out the taper sleeve and facilitating the assembly of the taper sleeve. Through the designed weight and the length of the center rod, the limiting gravity requirement for installing the taper sleeve is guaranteed, and the taper sleeve is easily separated from the matched taper hole by the weight impacting the top of the center rod upwards. The purpose of not damaging the taper sleeve and the taper hole of the part is achieved. The design of the upper gland notch meets the distance measurement between the top of the taper sleeve and the taper hole surface.
Description
Technical Field
The invention relates to the technologies of mechanical assembly, measurement and the like, in particular to a device for fixing force, measuring distance and assembling and disassembling a precise taper sleeve.
Background
A large taper hole is formed in a part, and the taper is 1:50, the taper hole depth is 160mm, a thin-wall taper sleeve with an average thickness of 5mm is required to be assembled, and the contact condition between the thin-wall taper sleeve and the taper sleeve is detected through the taper sleeve. Part technical requirements; the taper sleeve coated with a certain ink pad is pressed into the taper hole of the part with a constant force of 25+/-5 kg, and the distance between the large end of the taper sleeve and the large hole surface of the taper hole isAnd then the taper sleeve is taken out, and the contact surface of the conical surfaces of the two parts is detected to be more than 80%. To meet the above requirements, not only a hydraulic press is needed, but also a closed-loop control system with force measuring and distance measuring sensors is needed, the whole system is complex, and the investment is large. And after the taper sleeve is pressed in, the corresponding dismounting tool is lacking, so that the taper sleeve is extremely easy to damage and the taper holes of the matched parts are damaged.
Disclosure of Invention
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides a device with range finding, constant force and install and remove accurate taper sleeve, includes the taper sleeve, the taper sleeve cross section is the reverse T, and the taper sleeve is inside to be the unthreaded hole, the taper sleeve upper and lower surface is provided with the gland, and the gland includes upper gland and lower gland, be equipped with on the upper gland with taper sleeve unthreaded hole complex first location tang, first location tang runs through the upper gland setting, still evenly distributed has first lightening hole on the upper gland, first lightening hole is circumference evenly distributed; the lower gland is provided with a second positioning spigot corresponding to the first positioning spigot, the second positioning spigot penetrates through the lower gland, a first screw rod penetrates through the lower gland, and the first screw rod is fixedly connected with the upper gland and the lower gland through bolts; second lightening holes are uniformly distributed on the lower pressing cover, and the second lightening holes are uniformly distributed on the circumference; the lower gland center is penetrated and is equipped with the internal thread, goes up the gland center and runs through and be equipped with first through-hole, it is equipped with radial symmetrical's opening to go up the gland edge, run through between first through-hole and the internal thread and be equipped with the center pole, the center pole is the ladder step shape, the center pole includes knurl handle, first body of rod, well screw rod, second body of rod, lower screw rod, knurl handle, well screw rod and lower screw rod are located upper portion, middle part and the lower part of the body of rod respectively, and first body of rod is located the gland top, and the second body of rod is located the taper sleeve inside, lower screw rod and the internal thread threaded connection of gland down, well screw rod passes through the nut with first through-hole and is connected, the activity is provided with the weight on the body of rod between knurl handle and the well screw rod, weight upper and lower surface center is run through and is equipped with the second through-hole, weight and center pole pass through second through-hole sliding connection, the lower surface is provided with the macropore towards well screw rod, the macropore is located weight center department.
Preferably, the large hole size is larger than the size of the middle screw.
Preferably, the weights are arranged in a cylindrical shape and/or a rectangular shape,
preferably, the number of the lightening holes is 4-8, and the diameter of the lightening holes is 40mm.
Preferably, the central rod is arranged in a cylindrical shape and/or a square shape; the length of the center rod from top to bottom is set to 500mm, the knurled handle is set to 25mm, the first rod body is set to 310mm, and the second rod body is set to 165mm.
Preferably, the diameter of the upper gland is 220mm, and the diameter of the lower gland is 216mm.
Preferably, the device employs the following force method, impulse equation ft=mv and free-fall motion of forceObtain->Where t is the time for the weight to fall to the upper gland surface, g is the weight mass, g=9.8m/s 2,h is the weight falling to the upper gland surface height, and m is the weight mass.
Preferably, the taper of the taper sleeve is 1:50, the depth of the unthreaded hole is set to 160mm, the thickness of the taper sleeve is set to 5mm, and the first lightening hole corresponds to the second lightening hole in a vertical horizontal plane.
Preferably, the positioning spigot is set to 10mm.
Preferably, the first rod body is provided with threads at the position close to the knurled handle, and the knurled handle, the middle screw rod and the lower screw rod are fixedly connected with the central rod.
The invention has the beneficial effects that
(1) The invention combines the upper gland, the lower gland, the center rod, the weight, the fixing nut and the taper sleeve into a whole, thereby solving the problem of installing and taking out the taper sleeve and facilitating the assembly of the taper sleeve.
(2) Through the designed weight and the length of the center rod, the limiting gravity requirement for installing the taper sleeve is guaranteed, and the taper sleeve is easily separated from the matched taper hole by the weight impacting the top of the center rod upwards. The purpose of not damaging the taper sleeve and the taper hole of the part is achieved.
(3) The design of the notch of the upper gland meets the measurement of the distance between the top of the taper sleeve and the taper hole surface.
Drawings
Fig. 1 is a schematic cross-sectional structure of the present invention.
Fig. 2 is a schematic diagram of the upper gland structure of the cone sleeve of the present invention.
Fig. 3 is a schematic diagram of the lower gland structure of the cone sleeve of the present invention.
FIG. 4 is a schematic view of a weight structure according to the present invention.
Fig. 5 is a schematic view of the taper sleeve according to the present invention.
Reference numerals illustrate: 1-taper sleeve, 101-unthreaded hole, 2-upper gland, 201-first lightening hole, 202-first through hole, 203-opening, 204-first locating spigot, 3-lower gland, 301-second lightening hole, 302-internal threaded hole, 303-second locating spigot, 5-center rod, 501-knurled handle, 502-first rod body, 503-middle screw rod, 504-second rod body, 505-lower screw rod, 6-weight, 601-second through hole, 602-big hole.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The utility model provides a device with range finding, deciding power and installing and removing accurate taper sleeve, includes taper sleeve 1, taper sleeve 1 cross section is down T, and taper sleeve 1 is inside to be unthreaded hole 101, the tapering of taper sleeve 1 is 1:50, the depth of the unthreaded hole 101 is set to 160mm, the thickness of the taper sleeve 1 is set to 5mm, the upper surface and the lower surface of the taper sleeve 1 are provided with a gland, the gland comprises an upper gland 2 and a lower gland 3, the diameter of the upper gland 2 is set to 220mm, the diameter of the lower gland 3 is set to 216mm, a first positioning spigot 204 matched with the unthreaded hole 101 of the taper sleeve 1 is arranged on the upper gland 2, the first positioning spigot 204 penetrates through the upper gland 2, first lightening holes 201 are uniformly distributed on the upper gland 2, and the first lightening holes 201 are uniformly distributed in circumference; the lower gland 3 is provided with a second positioning spigot 204 corresponding to the first positioning spigotA spigot 303, wherein the second positioning spigot 303 penetrates through the lower gland 3, the diameter of the positioning spigot is 10mm, a screw rod is penetrated between the first positioning spigot 204 and the second positioning spigot 303, and the screw rod is fixedly connected with the upper gland 2 and the lower gland 3 through bolts; second lightening holes 301 are uniformly distributed on the lower gland 3, the second lightening holes 301 are uniformly distributed on the circumference, the first lightening holes 201 and the second lightening holes 301 are positioned on the vertical horizontal plane and correspond to each other, and the number of the lightening holes is 4; the center of the lower gland 3 is provided with an internal threaded hole 302 in a penetrating way, the center of the upper gland 2 is provided with a first through hole 202 in a penetrating way, the edge of the upper gland 2 is provided with a notch 203 which is symmetrical along the radial direction, a center rod 5 is arranged between the first through hole 202 and the internal threaded hole 302 in a penetrating way, a positioning spigot is arranged, and the upper gland 2 and the lower gland 3 are fixed by a screw rod, so that the gland can be prevented from shaking in the using process of the device, and the center rod 5 and the notch 203 of the upper gland 2 are positioned on the same axis, thereby being convenient for improving the measuring precision; the center rod 5 is in a stepped shape, the center rod 5 is arranged to be square, the center rod 5 comprises a knurled handle 501, a first rod body 502, a middle screw rod 503, a second rod body 504 and a lower screw rod 505, the knurled handle 501, the middle screw rod 503 and the lower screw rod 505 are respectively arranged at the upper part, the middle part and the lower part of the center rod 5, the first rod body 502 is arranged above the upper gland 2, the second rod body 504 is arranged in the taper sleeve 1, the lower screw rod 505 is in threaded connection with the internal threaded hole 302 of the lower gland 3, the middle screw rod 503 is connected with the first through hole 202 through a nut, the length of the center rod 5 is 500mm, the height of the knurled handle 501 is 25mm, the height of the first rod body 502 is 310mm, and the height of the second rod body 504 is 165mm; the weight 6 is movably arranged on the rod body between the knurled handle 501 and the middle screw 503, the center of the upper surface and the lower surface of the weight 6 is penetrated with a second through hole 601, the weight 6 and the center rod 5 are in sliding connection through the second through hole 601, the lower surface of the weight 6 faces the middle screw 503 and is provided with a large hole 602, the large hole 602 is positioned at the center of the weight 6, the size of the large hole 602 is larger than that of the middle screw 503, and the large hole 602 is beneficial to avoiding nuts on the middle screw 503; the device adopts the following fixed force method, wherein the impulse formula FT=MV and the free forceFalling body movementObtain->Wherein t is 0.1s when the weight 6 falls onto the surface of the upper gland 2, g is gravity acceleration, g=9.8 m/s 2,h is that the weight 6 falls onto the surface of the upper gland 2, the height value is 178 mm, m is that the weight 6 mass value is 12.5kg, and the device is matched with various values according to the formula so as to detect that the conical surface contact surface of two parts is more than 80%, thereby meeting the part requirements and not damaging the taper sleeve.
Example 2
This example is a further optimization made on the basis of example 1, in particular, the lightening holes are set to 6.
The embodiment is convenient for lightening the whole weight of the taper sleeve 1 device by arranging the lightening holes, thereby saving labor and being beneficial to the operation of operators.
Example 3
This embodiment is a further optimization made on the basis of embodiment 1, embodiment 2, specifically, the center rod 5 is set to be a cylinder type, and the weight 6 is set to be a cylinder type.
This implementation reduces the frictional force between weight 6 and center rod 5 through setting center rod 5 and weight 6 to the cylinder, is convenient for increase measurement accuracy.
Example 4
This example is a further optimization made on the basis of example 3, in particular, the lightening holes are set to 8.
The weight of the taper sleeve 1 device is further reduced by further increasing the lightening holes, so that the labor is further saved and the operation of operators is facilitated.
Example 5
This embodiment is a further optimization made on the basis of embodiment 4, in particular, the first rod body 502 is provided with threads by knurling the handle 501.
According to the embodiment, the taper sleeve 1 is convenient to take by arranging the threads, an anti-slip effect is achieved, and the situation that the device is damaged by sliding and operators are injured by smashing caused by too smooth central rod 5 in the process of taking the taper sleeve 1 is prevented.
Principle of operation
The invention relates to a device with a distance measuring function, a fixed force function and a precise taper sleeve assembling and disassembling function, when the device is used, a weight 6, an upper gland 2, a nut and the taper sleeve 1 are sequentially placed into a central rod 5, then a lower gland 3 is pressed, the central rod 5 is screwed into an internal threaded hole 302 of the lower gland 3 through the end of a lower screw 505, a first positioning spigot 204 and a second positioning spigot 302 are fixedly pressed through screws, and the upper gland 2 is pressed at a middle screw 503 of the central rod 5 through the nut, so that the device shown in fig. 1 is completed. Smearing stamp-pad ink with certain thickness on the outer surface of the taper sleeve 1 according to technical requirements, placing the device into a part taper hole, lifting the weight 6 to the knurled handle 501, putting the weight 6 on hand, enabling the weight 6 to fall down according to free falling bodies to strike the upper gland 2, measuring the axial distance between the large end of the taper sleeve 1 and the large end of the part taper hole at the notch of the upper gland 2 by using a height gauge until the axial distance meets the technical requirements, then holding the weight 6 to strike the knurled handle 501 upwards, and taking out the device after loosening. And detecting whether the contact rate meets the technical requirements or not by a inspector according to the contact condition.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (9)
1. The device with the distance measurement, force fixing and precise taper sleeve assembly and disassembly is characterized by comprising a taper sleeve (1), wherein the cross section of the taper sleeve (1) is of an inverted T shape, a unthreaded hole (101) is formed in the taper sleeve, a gland is arranged on the upper surface and the lower surface of the taper sleeve (1), the gland comprises an upper gland (2) and a lower gland (3), a first positioning spigot (204) matched with the unthreaded hole (101) of the taper sleeve (1) is arranged on the upper gland (2), the first positioning spigot (204) penetrates through the upper gland (2) and is uniformly distributed with first lightening holes (201), and the first lightening holes (201) are uniformly distributed in circumference; the lower gland (3) is provided with a second positioning spigot (303) corresponding to the first positioning spigot (204), the second positioning spigot (303) penetrates through the lower gland (3), a screw rod is penetrated between the first positioning spigot (204) and the second positioning spigot (303), and the screw rod is fixedly connected with the upper gland (2) and the lower gland (3) through bolts; second lightening holes (301) are uniformly distributed on the lower gland (3), and the second lightening holes (301) are uniformly distributed on the circumference; the center of the lower gland (3) is penetrated and provided with an internal threaded hole (302), the center of the upper gland (2) is penetrated and provided with a first through hole (202), the edge of the upper gland (2) is provided with an opening (203) which is symmetrical along the axial direction, a central rod (5) is penetrated and provided between the first through hole (202) and the internal threaded hole (302), the central rod (5) is in a stepped shape, the central rod (5) comprises a knurled handle (501), a first rod body (502), a middle screw rod (503), a second rod body (504) and a lower screw rod (505), the knurled handle (501), the middle screw rod (503) and the lower screw rod (505) are respectively positioned at the upper part, the middle part and the lower part of the central rod (5), the first rod body (502) is positioned above the upper gland (2), the second rod body (504) is positioned inside the taper sleeve (1), the middle screw rod (505) is in threaded connection with the first through hole (302) of the lower gland (3), the middle screw rod (202) is connected with the first through a nut, the first through hole (501) is positioned between the knurled handle (501) and the middle screw rod (503), the upper movable weight (6) is provided with a second through hole (601) and a weight (6) which is movably arranged on the upper surface of the upper weight (601), a large hole (602) is formed in the lower surface of the weight (6) towards the middle screw rod (503), and the large hole (602) is positioned at the center of the weight (6);
the device adopts the following fixed force method, and the impulse formula Ft=mV and free falling body movement of the forceObtainingWhich is provided withWherein t is the time for the weight (6) to fall onto the surface of the upper gland (2), the weight is taken as 0.1s, g is the gravity acceleration, g=9.8m/s 2,h is the height for the weight (6) to fall onto the surface of the upper gland (2), the value is 178 mm, m is the mass of the weight (6), and the value is 12.5kg.
2. The device with distance measurement, force setting and precise taper sleeve assembling and disassembling according to claim 1, characterized in that the large hole (602) is larger in size than the middle screw (503).
3. Device with distance measurement, force setting and precise taper sleeve mounting and dismounting according to claim 2, characterized in that the weight (6) is arranged in cylindrical and/or rectangular shape.
4. A device with distance measuring, force setting and precise taper sleeve assembling and disassembling according to claim 3, characterized in that the first lightening holes (201) and the second lightening holes (301) are set to 4-8, and the lightening holes are set to 40mm in diameter.
5. Device with distance measurement, force setting and precise taper sleeve mounting and dismounting according to claim 4, characterized in that the central rod (5) is arranged in a cylindrical and/or square shape; the length of the center rod (5) is set to 500mm, the height of the knurled handle (501) is set to 25mm, the height of the first rod body (502) is set to 310mm, and the height of the second rod body (504) is set to 165mm.
6. The device with the distance measurement, force setting and precise taper sleeve assembling and disassembling functions according to claim 5, wherein the diameter of the upper gland (2) is 220mm, and the diameter of the lower gland (3) is 216mm.
7. The device with distance measurement, force setting and precise taper sleeve assembling and disassembling according to claim 6, characterized in that the taper of the taper sleeve (1) is 1:50, the depth of the light hole (101) is set to 160mm, the thickness of the taper sleeve (1) is set to 5mm, and the first lightening hole (201) and the second lightening hole (301) are located on the vertical horizontal plane.
8. The device with distance measurement, force setting and precise taper sleeve assembling and disassembling according to claim 7, wherein the diameters of the first positioning spigot (204) and the second positioning spigot (303) are set to be 10mm.
9. The device with distance measurement, force setting and precise taper sleeve assembling and disassembling according to claim 8, characterized in that the first rod body (502) is provided with threads by knurling the handle (501).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910400444.7A CN110125865B (en) | 2019-05-15 | 2019-05-15 | Device with range finding, fixed force and install and remove accurate taper sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910400444.7A CN110125865B (en) | 2019-05-15 | 2019-05-15 | Device with range finding, fixed force and install and remove accurate taper sleeve |
Publications (2)
| Publication Number | Publication Date |
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| CN110125865A CN110125865A (en) | 2019-08-16 |
| CN110125865B true CN110125865B (en) | 2024-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910400444.7A Active CN110125865B (en) | 2019-05-15 | 2019-05-15 | Device with range finding, fixed force and install and remove accurate taper sleeve |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110307980A (en) * | 2019-08-21 | 2019-10-08 | 中车株洲电机有限公司 | A kind of traction electric machine is axial to quantify loading device and its operating method |
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|---|---|---|---|---|
| FR2648070A1 (en) * | 1989-06-12 | 1990-12-14 | Stolz Sequipag | Device for unblocking and mounting devices using a tapered sleeve |
| DE19902744A1 (en) * | 1999-01-25 | 2000-07-27 | Bayerische Motoren Werke Ag | Covering cap removal process, involving using pressing-off device through breakthrough in cap to remove cap |
| CN2572092Y (en) * | 2002-09-17 | 2003-09-10 | 雷永志 | Connection taper-sleeve quick assembling/disassembling by screw |
| CN201082532Y (en) * | 2007-07-20 | 2008-07-09 | 宝山钢铁股份有限公司 | Shaft sleeve detaching device |
| CN204135985U (en) * | 2014-07-31 | 2015-02-04 | 成都易态科技有限公司 | Fume recovery system cartridge removal specific purpose tool |
| CN206663107U (en) * | 2017-03-28 | 2017-11-24 | 宝钢集团新疆八一钢铁有限公司 | A kind of draw-off gear for removing inserted valve valve pocket |
| CN108453495A (en) * | 2017-02-22 | 2018-08-28 | 波音公司 | Method and kit for for removing conical sleeve bolt from component |
| CN208196664U (en) * | 2018-05-16 | 2018-12-07 | 王好兵 | For taking the tooling of diesel injector copper sheathing |
| CN210476805U (en) * | 2019-05-15 | 2020-05-08 | 江西洪都精工机械有限公司 | Device with distance measurement, decide power and install and remove accurate taper sleeve |
-
2019
- 2019-05-15 CN CN201910400444.7A patent/CN110125865B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2648070A1 (en) * | 1989-06-12 | 1990-12-14 | Stolz Sequipag | Device for unblocking and mounting devices using a tapered sleeve |
| DE19902744A1 (en) * | 1999-01-25 | 2000-07-27 | Bayerische Motoren Werke Ag | Covering cap removal process, involving using pressing-off device through breakthrough in cap to remove cap |
| CN2572092Y (en) * | 2002-09-17 | 2003-09-10 | 雷永志 | Connection taper-sleeve quick assembling/disassembling by screw |
| CN201082532Y (en) * | 2007-07-20 | 2008-07-09 | 宝山钢铁股份有限公司 | Shaft sleeve detaching device |
| CN204135985U (en) * | 2014-07-31 | 2015-02-04 | 成都易态科技有限公司 | Fume recovery system cartridge removal specific purpose tool |
| CN108453495A (en) * | 2017-02-22 | 2018-08-28 | 波音公司 | Method and kit for for removing conical sleeve bolt from component |
| CN206663107U (en) * | 2017-03-28 | 2017-11-24 | 宝钢集团新疆八一钢铁有限公司 | A kind of draw-off gear for removing inserted valve valve pocket |
| CN208196664U (en) * | 2018-05-16 | 2018-12-07 | 王好兵 | For taking the tooling of diesel injector copper sheathing |
| CN210476805U (en) * | 2019-05-15 | 2020-05-08 | 江西洪都精工机械有限公司 | Device with distance measurement, decide power and install and remove accurate taper sleeve |
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| CN110125865A (en) | 2019-08-16 |
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