CN111360751A - Method for pulling out inner embedded bushing - Google Patents
Method for pulling out inner embedded bushing Download PDFInfo
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- CN111360751A CN111360751A CN202010171176.9A CN202010171176A CN111360751A CN 111360751 A CN111360751 A CN 111360751A CN 202010171176 A CN202010171176 A CN 202010171176A CN 111360751 A CN111360751 A CN 111360751A
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- bushing
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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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Abstract
The invention discloses a method for pulling an embedded bushing, aiming at solving the defect that the bushing is difficult to remove in the process of pulling out the bushing, and the method is realized by the following technical scheme: preparing a pulling rod inserted into the upper-sleeve power cabin, a cap edge opening pressure-bearing seat capable of being fixed on the working face of a workpiece bushing, an elastic expansion sleeve capable of being inserted into the bottom end face of a workpiece hole along the inner wall of the workpiece bushing and provided with a symmetrical open slot and an end bottom shackle, and a cam rotating shaft transversely penetrating through the cavity of the upper-sleeve power cabin for assembly; the elastic expansion sleeve is radially contracted and then inserted into the inner channel of the workpiece bushing, the pulling rod is connected with the cone guide expansion rod, the cone guide expansion rod expansion head with large upper part and small lower part of conicity is dropped into the elastic expansion sleeve inserted into the hole wall of the workpiece bushing through the supporting sleeve by virtue of the inner cavity of the cap edge opening pressure bearing seat, and the pulling rod is driven by the cam rotating shaft to drive the elastic expansion sleeve to withdraw the workpiece bushing inserted into the workpiece hole along with the elastic shackle through the annular elastic shackle with the end clamped.
Description
Technical Field
The invention relates to a method for containing a workpiece by an electric pull-out hole in the mechanical manufacturing industry, in particular to a method for quickly pulling out various interference fit bushings and drill bushings by an auxiliary tool and a method for pulling out an embedded bushing.
Background
The bush is a thin-wall revolving body workpiece which has the advantages of simple structure, good centering performance with a hub hole, high bearing capacity and reliable work under vibration, is a thin-wall revolving body workpiece which needs to be continuously replaced due to abrasion and is easy to damage, occupies a large proportion in disassembly and assembly, and can not damage the matching property of the parts and damage the working surface of the parts in the process of disassembling and assembling the parts. At present, the worn lining sleeve is clamped on a lathe for turning in a common method when being replaced after being worn. This is possible for bushings embedded in rotating bodies, but is cumbersome, requires a long machining cycle, is expensive, is inefficient, and loses its value after turning. If the turning of the non-rotating body embedded bushing workpiece is limited by a complicated field space or a working condition angle, the turning is difficult to implement, and a special clamping tool needs to be prepared according to the shape of the workpiece. The common additional fastener concentricity and fit tightness hole containing piece bushing is provided with a guide port, is generally pressed and assembled on the top surface in a flush mode, is pressed in by interference fit with large radial pressure generated between the fit surfaces, is difficult to pull out by pressing a deep blind hole of the bushing in a workpiece hole, and is more difficult to pull out by only dismounting the blind hole embedded with the interference fit thin-wall bushing from one direction. For example, a hydraulic bushing on a diesel engine bearing hole or a journal using a dry thin-wall cylinder liner, the pressure during disassembly is greater than the pressure during assembly. When the cylinder liner is excessively worn or pulled, the cylinder liner needs to be replaced. The oil sprayer bearing seat hole bush is a hole containing workpiece which is made of a red copper sleeve and has a certain interference fit, and when the workpiece is in interference fit, the swelling deformation of a shell and the compression deformation of the bush are factors which simultaneously have influence on deformation, so that the thin-wall component is quite complex, and the deformation degree of the thin-wall component is obviously increased along with the increase of the interference fit. Rust or frayed perforations can occur over long periods of use. Therefore, after the bush is rusted, the old bush should be pulled out and pressed into the new bush, but the bush needs to be removed by a special removing tool. The prior art cylinder liner extractor is used for extracting a used cylinder liner or a bush from a cylinder block hole. The extractor is usually connected to the expansion rod by means of a joint before removing the old bush, the expandable extractor being first inserted into the bush hole and to the end. Then, the nut on the shifting head is screwed to expand the shifting head so as to tightly pull the inner hole of the bushing. Finally, the puller ram and the puller are coupled by an M12 mm nipple. Fixing the shifting block by a vice, detaching a tensioning nut on the shifting block, downwards punching a middle piece rod of the shifting block by a hammer or a punching hammer, and detaching the old lining from the shifting block. But damage to the fitting during withdrawal. For the bushing pressed into the blind hole workpiece, the upper edge of the bushing is manually knocked in the opposite direction to extrude the bushing to rotate, the bushing is abraded and is matched with an inner hole of the workpiece, and the bushing is taken out. Knock-down is the simplest and most common method of disassembly. The method is a disassembling method which can realize the disassembling purpose by displacing the parts matched with each other by the hammering force. The common tools for striking and dismantling are hand hammers, i.e. common fitter hand hammers, punches and cushion blocks. The hammering method has the disadvantages of low efficiency, multiple potential safety hazards, high manual control difficulty, uneven force application, easy workpiece aperture deformation, workpiece aperture tolerance change due to abrasion, even workpiece deformation or over-tolerance, influence on mechanical performance of the workpiece, and high labor intensity. If the spot welding mode is adopted, the blind hole workpiece press-fitting bushing is pulled out in a mode of manually pulling out the pin rod through the bushing subjected to spot welding by the pin rod, the labor intensity is still very high, the working efficiency is not improved, the operation mode can cause the phenomena of breakage, breakage and the like of the bushing or the drill bushing, the mechanical performance of parts can be affected seriously, the deformation of the bushing and the workpiece is large, the deformation of the whole set of tool is easy to cause, and the press-fitting workpiece is out of tolerance and scrapped. When the hole bottom of the bushing assembly is a stepped hole or a blind hole, a common bushing dismounting tool utilizes a plurality of clamping jaws to pull out the bushing, the clamping jaws are difficult to keep synchronous stress during operation, and the clamping jaws are easy to break and damage the hole bottom. Therefore, the traditional bushing pulling-out mode has the advantages that the operation procedures are complex, the deformation is large, the damage to the workpiece and the bushing is strong, and the working performance of the workpiece is seriously influenced; the operation mode has the disadvantages of high labor intensity, time and labor waste and low efficiency, and the field production requirement is difficult to meet. In order to solve the problems existing in the existing part bushing removal, a set of convenient removal device is urgently needed to be designed for preventing the parts from being damaged or generating overlarge plastic deformation under the assembling stress and the working stress, the removal universality is enhanced, the production efficiency is improved, and the labor intensity is reduced.
Chinese patent application No. CN201820624895, application publication No. CN208246701U discloses a large-diameter thin-wall bushing extracting device, which is designed with a movable gripping arm and a fixed gripping arm, wherein the movable gripping arm and the fixed gripping arm are respectively and rigidly connected with a movable half ring and a fixed half ring, the two half rings are separately connected, and can form a tightly and completely associated pull ring, the movable gripping arm is used for radially adjusting the position of the movable half ring relative to the fixed half ring, and can be rapidly assembled at the position of the bushing to be disassembled, the pull ring and the bushing are in a surface contact structure, and the bushing is pulled out under stress to extract the large-diameter thin-wall bushing. But the bushing pressed into the blind hole of the workpiece in an interference fit cannot be taken out.
Disclosure of Invention
The invention aims to solve the existing defects, and aims to solve the problems that the bushing in interference fit is difficult to remove and the use performance is influenced by deformation after the bushing is removed, and the bushing extractor is simple in structure, low in manufacturing cost, high in extracting efficiency, high in working efficiency, strong in universality and capable of being quickly and accurately extracted. The problem that the bushing and a workpiece deform in the process of pulling out the bushing, particularly the blind hole workpiece bushing, is solved, and the bushing pulling-out efficiency and the stability and reliability in the pulling-out process are improved.
The technical scheme adopted by the invention for solving the technical problem is that the method for pulling the inner embedded bushing has the following technical characteristics: preparing a pulling-up rod 10 inserted into a cylinder body of a step at the lower end of an upper power compartment 2, a cap edge opening pressure-bearing seat 3 capable of being fixed on the working surface of a workpiece bushing 7, an elastic expansion sleeve 6 which can be inserted into the bottom end surface of a workpiece hole along the inner wall of the workpiece bushing 7 and is provided with a symmetrical open slot and an end bottom shackle, and a cam rotating shaft 8 transversely penetrating through a cavity of the upper power compartment 2 for assembly, wherein one end of the pulling-up rod 10 is provided with an open groove connected with a short shaft of an elliptical ring 11, and the other end of the pulling-up rod is provided with a step buckle connected with a notch groove; the elastic expansion sleeve 6 is inserted into the inner channel of the workpiece bushing 7 after being radially contracted, the pulling rod 10 is connected with the conical guide expansion rod 4, the cone with big top and small bottom conicity is guided to the expanding rod 4 to expand the pulling head through the inner cavity of the cap edge opening pressure bearing seat 3, the supporting sleeve falls into the elastic expansion sleeve 6 inserted into the inner hole wall of the workpiece bushing 7, the inner hole of the elastic expansion sleeve 6 contracts to generate interference between the matching surfaces of the containing parts, the pulling rod 10 is driven by the cam rotating shaft 8, the cam pulls out the conical guide expansion rod 4 which is in a self-locking state with the inner wall of the elastic expansion sleeve 6 upwards through the elliptical ring 11 to fasten the elastic expansion sleeve 6 expanded from the inner hole wall of the workpiece bushing 7, the workpiece bush 7 inserted into the workpiece hole is withdrawn together with the elastic shackle by the axial component force generated by the taper of the annular elastic shackle clamped in the end direction and the expansion head tightly pressing against the inner wall of the bush.
Compared with the prior art, the invention has the following beneficial effects.
Simple structure and low manufacturing cost. The invention is provided with the conical guide opening rod 4 with a big top and a small bottom at the free end of the pulling rod 10 and the elastic expansion sleeve 6 which can be inserted into the inner hole of the workpiece bushing 7 in the blind hole, and has the advantages of simple and compact structure, small size, light weight, convenient carrying, high pulling efficiency and good effect. The collision damage deformation can not be generated, the interference fit part can be prevented from being deformed or damaged, the original fit relation can not be damaged, the working surface of the part is not damaged, and the clean and intact damage to the fit surface can be ensured. Compared with the prior art, the expensive hydraulic bushing extractor has the advantages of low manufacturing cost, portability for a plurality of times, small control difficulty, simple operation, time and labor saving, and convenient and quick use.
The invention has high extraction efficiency, adopts an elastic expansion sleeve 6 which is provided with a big top and a small bottom and can be inserted into a workpiece bushing 7, the fixed end of the elastic expansion sleeve 6 is in bolt connection with a conical guide opening rod 4, a rotating shaft 8 provided with a cam on a rod body is provided with an elliptical hole on which the cam is assembled into a cam ring, and a pin hole at one end of the cam and a pin hole on a fork lug of the conical guide opening rod 4. The elastic expansion sleeve expands to extrude the bushing, a mechanical device is additionally arranged at the front end of the electric drill to convert the rotary motion into linear motion, and the bushing and the drill sleeve are accurately and quickly pulled out of a workpiece hole, so that the technical requirement of taking out the workpiece bushing is met. The field resource is fully utilized for the electric drill, a mechanical transmission device is arranged at the front end of the electric drill, the rotary motion of the electric drill is converted into the linear reciprocating motion of the elastic expansion sleeve 6, and the workpiece bushing 7 is automatically pulled out; the working time is greatly shortened, and the extraction efficiency is improved.
The drawing quality is high and the effect is good. According to the invention, the bush is expanded and extruded through the elastic expansion sleeve, a mechanical device is additionally arranged at the front end of the electric drill to convert the rotary motion into linear motion, the bush and the drill sleeve are accurately and quickly pulled out of a workpiece hole, the expansion degree of the elastic expansion sleeve 6 is controlled by adjusting the conical surface of the conical guide expansion rod adjusting rod 4, the elastic expansion sleeve 6 is used for tensioning the workpiece bush 7, the electric tool is used for driving the electric rotating shaft 8 provided with the elliptical groove to do rotary motion, the limiting pin 9 is used for converting the rotary motion into continuous periodic linear motion, and upward pulling lifting force is provided in the vertical direction, so that the workpiece bush 7 is pulled out. And (4) taking out the blind hole bush required by the workpiece bush technology. The pulling-out device provides a lifting force for pulling out vertically and upwards through the transmission of the cam oval groove, can effectively control the deformation of the matching surface of the lining and the workpiece, has small deformation amount for pulling out the lining, can be repeatedly used, and cannot damage accessories in the pulling-out process.
High precision and high efficiency. The invention adopts an electric drill to push an electric rotating shaft 8 at a high speed to connect an adjusting support rod 10 in an elliptical groove, and the end of the electric rotating shaft is connected with a conical adjusting rod 4 to drive an elastic expansion sleeve 6 to vertically pull a workpiece bush 7 out of an inner hole of a bush workpiece. The forward extraction of the bushing can be realized with high efficiency and high quality, a manual knocking or spot welding mode is not needed, the labor intensity is effectively reduced, the production efficiency is improved, and the working efficiency is improved by 80 percent compared with the traditional manual sleeve pressing mode.
The application range is wide. The elastic expansion sleeve 6 can select corresponding specifications according to the workpiece bushings 7 with different specifications, has wide application range and can pull out the workpiece bushings 7 with the specifications of 15mm-45 mm.
Drawings
FIG. 1 is a cross-sectional view of the present invention in-liner extraction device.
Fig. 2 is a side view of fig. 1.
Fig. 3 is a schematic drawing of one extraction principle of the workpiece bushing of fig. 1.
Fig. 4 is a schematic view showing the construction of the elastic expansion sleeve 6 of fig. 1.
Fig. 5 is a schematic view of the construction of the electric rotary shaft 8 of fig. 1.
In the figure: the device comprises a cover plate 1, a power cabin 2, a cap edge opening pressure bearing seat 3, a conical guide opening rod 4, an adjusting bolt 5, an elastic expansion sleeve 6, a workpiece bushing 7, an electric rotating shaft 8, a limiting pin 9 and a pull-up rod 10.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
Detailed Description
See fig. 1-5. According to the invention, a pulling rod 10 inserted into a cylinder body of a step at the lower end of an upper power compartment 2, a cap edge opening pressure-bearing seat 3 capable of being fixed on the working surface of a workpiece bushing 7, an elastic expansion sleeve 6 capable of being inserted into the bottom end surface of a workpiece hole along the inner wall of the workpiece bushing 7 and provided with symmetrical open slots and end bottom shackles, and a cam rotating shaft 8 transversely penetrating through a cavity of the upper power compartment 2 for assembly are prepared, one end of the pulling rod 10 is provided with an opening groove connected with a short shaft of an elliptical ring 11, and the other end is provided with a step buckle connected with a gap groove of a conical guide opening rod 4; the elastic expansion sleeve 6 is inserted into the inner channel of the workpiece bushing 7 after being radially contracted, the pulling rod 10 is connected with the conical guide expansion rod 4, the cone with big top and small bottom conicity is guided to the expanding rod 4 to expand the pulling head through the inner cavity of the cap edge opening pressure bearing seat 3, the supporting sleeve falls into an elastic expansion sleeve 6 inserted into the inner hole wall of a workpiece bushing 7, the inner hole of the elastic expansion sleeve 6 shrinks to generate interference between the matching surfaces of the containing parts, a pulling rod 10 is driven by a cam rotating shaft 8, a cam pulls a conical guide expansion rod 4 which is in a self-locking state with the inner wall of the elastic expansion sleeve 6 upwards and outwards through an elliptical ring 11 to fasten the elastic expansion sleeve 6 expanded from the inner hole wall of the workpiece bushing 7, the workpiece bush 7 inserted into the workpiece hole is withdrawn together with the elastic shackle by the axial component force generated by the taper of the annular elastic shackle clamped in the end direction and the expansion head tightly pressing against the inner wall of the bush. Before the bush is pulled out, an elastic expansion sleeve 6 with a big top and a small bottom is inserted into a workpiece bush 7, the elastic expansion sleeve 6 is in threaded connection with the fixed end of a conical guide expansion rod 4, a rotating shaft 8 with a cam on a rod body is provided with an elliptical ring 11 on which the cam is assembled, and a pin hole at one end of the cam and a pin hole on a fork lug of the conical guide expansion rod 4. The pulling rod 10 is connected through the limit pin 9. When the workpiece bushing 7 is pulled out, the annular elastic shackle grabbing arms on the two sides of the bottom of the brim opening pressure bearing seat 3 are fixed at the two ends of the workpiece bushing 7 through the adjusting bolts 5 or are buckled on the bottom end face of the workpiece bushing 7 in a reverse direction; the electric drill bit is connected with an electric cam rotating shaft 8, the electric rotation drives the cam rotating shaft 8 and a cam thereof to rotate, and the rotating motion of the cam is converted into periodical reciprocating linear motion of the pulling rod 10; meanwhile, the conical guide opening rod 4 drives the elastic expansion sleeve 6 to do periodic linear motion, and the generated radial expansion extrusion friction force pushes the workpiece bush 7 to be pulled to move upwards until the workpiece bush 7 is pulled out.
In alternative embodiments, for ease of use. The upper power compartment 2 is a hollow body which is not covered by the cover plate 1. The upper end of the elastic expansion sleeve 6 is provided with an internal thread step counter bore, and the upper end of the opening is provided with a crack-stopping circular arc. The lower end of the elastic expansion sleeve 6 is provided with a step which can be used for hanging a blind hole. The workpiece bushing 7 can be inserted into the bottom end of the blind hole of the workpiece, and the elastic expansion sleeve 6 is in a straight cylinder shape. Before the bush is pulled out, an elastic expansion sleeve 6 with a big top and a small bottom is inserted into a workpiece bush 7, the elastic expansion sleeve 6 is in threaded connection with the fixed end of a conical guide expansion rod 4, a rotating shaft 8 of a cam is arranged on a rod body, the cam is assembled in an elliptical hole of an elliptical ring 11, and a pin hole at one end of the cam and a pin hole on a fork lug of the conical guide expansion rod 4 are connected with a pull-up rod 10 through a limiting pin 9.
The foregoing is directed to the preferred embodiment of the present invention and it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (7)
1. The method for pulling the inner embedded bushing has the following technical characteristics: preparing a pulling-up rod (10) inserted into a cylinder body at the lower end of an upper sleeve power cabin (2), a cap edge opening pressure-bearing seat (3) capable of being fixed on the working surface of a workpiece bushing (7), an elastic expanding sleeve (6) capable of being inserted into the bottom end surface of a workpiece hole along the inner wall of the workpiece bushing (7) and provided with symmetrical open slots and end bottom shackles, and a cam rotating shaft (8) transversely penetrating through a cavity of the upper sleeve power cabin (2) for assembly, wherein one end of the pulling-up rod (10) is provided with an open groove connected with a short shaft of an elliptical ring (11), and the other end of the pulling-up rod is provided with a step buckle connected with a notch groove of a conical guide; the elastic expansion sleeve (6) is radially contracted and then inserted into the inner channel of a workpiece bushing (7), a pulling rod (10) is connected with a cone guide expansion rod (4), the cone guide expansion rod (4) with large upper part and small lower part of conicity is expanded and pulled through the inner cavity of a cap edge opening pressure bearing seat (3), the elastic expansion sleeve (6) falls into the elastic expansion sleeve (6) inserted into the inner hole wall of the workpiece bushing (7) through a supporting sleeve, the inner hole of the elastic expansion sleeve (6) is contracted to generate interference between the matching surfaces of a containing part, the pulling rod (10) is driven by a cam rotating shaft (8), a cam is upwards and outwards pulled through an elliptical ring (11) to pull the pulling head of the cone guide expansion rod (4) which is in a self-locking state with the inner wall of the elastic expansion sleeve (6), the elastic expansion sleeve (6) expanded on the inner hole wall of the workpiece bushing (7) is fastened, and the axial component force generated by the conical expansion head which tightly presses the inner wall of the bushing through an annular elastic, the workpiece bush (7) inserted into the workpiece hole is withdrawn together with the elastic shackle.
2. The method of claim 1, wherein: the conical guide opening rod (4) drives the elastic expansion sleeve (6) to do periodic linear motion, and the generated radial expansion extrusion friction force pushes the workpiece bushing ()7 to be pulled to move upwards until the workpiece bushing (7) is pulled out.
3. The method of claim 1, wherein: the upper end of the elastic expansion sleeve (6) is provided with an internal thread step counter bore, and the upper end of the opening is provided with a crack-stopping circular arc.
4. The method of claim 1, wherein: the lower end of the elastic expansion sleeve (6) is provided with a step shackle for hanging the blind hole.
5. The method of claim 1, wherein: for the workpiece bushing (7) inserted into the bottom end of the blind hole of the workpiece, the elastic expansion sleeve (6) is in the shape of a straight cylinder.
6. The method of claim 1, wherein: the upper power cabin (2) is a hollow body covered by the cover plate (1).
7. The method of claim 1, wherein: the elastic expansion sleeve (6) is in threaded connection with the fixed end of the conical guide expansion rod (4), a rotating shaft (8) of the cam is arranged on the rod body, the cam is assembled in an elliptical hole of an elliptical ring (11), and a pin hole at one end of the cam is connected with a pin hole on a fork lug of the conical guide expansion rod (4) through a limiting pin (9) to form a pulling rod (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010171176.9A CN111360751A (en) | 2020-03-12 | 2020-03-12 | Method for pulling out inner embedded bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010171176.9A CN111360751A (en) | 2020-03-12 | 2020-03-12 | Method for pulling out inner embedded bushing |
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| CN111360751A true CN111360751A (en) | 2020-07-03 |
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| CN202010171176.9A Pending CN111360751A (en) | 2020-03-12 | 2020-03-12 | Method for pulling out inner embedded bushing |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112706120A (en) * | 2020-12-30 | 2021-04-27 | 江苏省无锡探矿机械总厂有限公司 | Tool assembly for dismounting and mounting small-diameter cylinder sleeve in blind hole |
| CN113183082A (en) * | 2021-04-29 | 2021-07-30 | 眉山中车制动科技股份有限公司 | Brake valve sleeve withdrawing device and sleeve withdrawing method thereof |
| CN113459035A (en) * | 2021-08-02 | 2021-10-01 | 济南隆超石油机械锻造有限公司 | Inner cylinder sleeve pulling tool for bimetal cylinder sleeve |
| CN114274093A (en) * | 2021-12-30 | 2022-04-05 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Mechanism and method for pulling out output gear assembly of ram air turbine system |
| TWI789152B (en) * | 2021-12-09 | 2023-01-01 | 立晏企業有限公司 | Removal and installation tool |
| TWI811065B (en) * | 2022-08-17 | 2023-08-01 | 國立高雄科技大學 | Puller |
| CN116783044A (en) * | 2021-12-29 | 2023-09-19 | 温州美葆科技技术有限公司 | Shaver handle structure |
| CN119703697A (en) * | 2023-09-27 | 2025-03-28 | 上海飞机制造有限公司 | Bushing dismounting device and bushing dismounting method |
| CN120267384A (en) * | 2025-06-06 | 2025-07-08 | 安忻(成都)医疗科技发展有限责任公司 | Supporting device for uterine cavity drainage and using method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112706120A (en) * | 2020-12-30 | 2021-04-27 | 江苏省无锡探矿机械总厂有限公司 | Tool assembly for dismounting and mounting small-diameter cylinder sleeve in blind hole |
| CN113183082A (en) * | 2021-04-29 | 2021-07-30 | 眉山中车制动科技股份有限公司 | Brake valve sleeve withdrawing device and sleeve withdrawing method thereof |
| CN113459035A (en) * | 2021-08-02 | 2021-10-01 | 济南隆超石油机械锻造有限公司 | Inner cylinder sleeve pulling tool for bimetal cylinder sleeve |
| CN113459035B (en) * | 2021-08-02 | 2022-08-05 | 济南隆超石油机械锻造有限公司 | Inner cylinder sleeve pulling tool for bimetal cylinder sleeve |
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| CN114274093A (en) * | 2021-12-30 | 2022-04-05 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Mechanism and method for pulling out output gear assembly of ram air turbine system |
| TWI811065B (en) * | 2022-08-17 | 2023-08-01 | 國立高雄科技大學 | Puller |
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