CN108544422B - Hydraulic power-assisted pin pulling device and pin pulling method - Google Patents
Hydraulic power-assisted pin pulling device and pin pulling method Download PDFInfo
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- CN108544422B CN108544422B CN201810414034.3A CN201810414034A CN108544422B CN 108544422 B CN108544422 B CN 108544422B CN 201810414034 A CN201810414034 A CN 201810414034A CN 108544422 B CN108544422 B CN 108544422B
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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
- B25B27/026—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 fluid driven
Abstract
A novel hydraulic power assisting pin pulling device relates to a novel shaft end limiting split pin pulling device based on hydraulic power transmission assistance. The device is used for solving the defect that the existing pin puller cannot efficiently and continuously pull out the limiting opening pin at the shaft end. The technical scheme adopted by the invention is that a hydraulic transmission system is combined with a pin pulling clamp, and a set of hydraulic transmission power assisting system is added on a mechanical shearing clamp, wherein the hydraulic transmission power assisting system comprises a power cylinder, a pin bundling stroke cylinder and a pin pulling power cylinder. The mechanical shearing pliers are propped against the end part of the split pin shaft, and the handle is pulled to amplify and transmit the force to the piston of the power cylinder; the piston moves to push hydraulic oil to be injected into the pin bundling stroke cylinder with smaller load, and the pin bundling and angle splitting component is driven to reduce the opening angle of the cotter pin; when the pin bundling stroke cylinder reaches a limiting position, the oil is injected into the pin pulling boosting cylinder with larger steering load, so as to drive the pin pulling sharp mouth component to move linearly, and the cotter pin is pulled out along the pin pulling direction. The pin pulling device can effectively improve pin pulling operation efficiency, and does not increase extra energy consumption.
Description
Technical Field
The invention relates to a device and a method for pulling out a mechanical shaft end limiting cotter pin, in particular to a shaft end limiting cotter pin pulling device based on hydraulic transmission assistance.
Background
Cotter pins are commonly used for limiting installed parts in the assembly of running machinery, so that accidents caused by falling of the parts are prevented. When the machine is maintained, the cotter pin needs to be removed first and then the part can be removed. However, when the general operating machine works outdoors, the cotter pin is difficult to pull out from the pin hole due to the influence of rust and dirt. At present, the daily pin withdrawing method of the cotter pin generally comprises the steps of firstly reducing the split angle of the cotter pin as much as possible by using a pin bundling device, then inserting a hook into a hole of the cotter pin, hammering the hook by a hammer to completely withdraw the cotter pin. In the whole process, the operation steps are numerous, the used tools are more, more manpower and material resources are consumed, and the efficiency of mechanical maintenance is reduced. Therefore, a labor-saving and efficient pin pulling device is urgently needed in field maintenance in the mechanical industry.
At present, some students are researching and extracting cotter pin devices at home. For example, a screw pair-based pin pulling device is proposed in the patent number CN107398860A, and the efficiency is lower although the pin pulling can be enhanced; patent number CN107351021a proposes a pin puller based on a ram sleeve rod, which pulls out pins by using the impact force of a ram, but it is difficult to control the pulling force, which is inconvenient to operate. The hydraulic pin puller is connected with a high-pressure oil pump trolley according to the hydraulic jack principle, and the high-pressure oil is utilized to drive a pin puller hook head to pull out the cotter, so that the cotter split angle is extruded and converged by a pin opening. The device needs to be connected with a high-pressure oil pump, is inconvenient to use, and can increase the energy consumption of pulling out the pin by extruding the pin tail through the pin hole, and meanwhile, the cotter pin can be broken. In view of the defects of the existing pin pulling device, the design of the labor-saving pin pulling device has very important practical engineering significance.
Disclosure of Invention
The invention aims to provide a hydraulic power-assisted pin pulling device and a pin pulling method, which solve the defect that the existing pin puller cannot effectively and continuously pull out a shaft end limiting opening pin. The device reasonable in design, low cost, convenient to use can effectively improve the round pin operating efficiency of pulling out, does not increase extra energy consumption simultaneously.
The technical scheme adopted by the invention is that a hydraulic transmission system is combined with pin pulling pliers, and a set of hydraulic transmission power assisting system is added on a mechanical shear pliers 1, wherein the hydraulic transmission power assisting system comprises a power cylinder 2, a pin pulling stroke cylinder 3 and a pin pulling power cylinder 4.
The mechanical shearing pliers are composed of a main rod 1-1, a handle 1-2, a two-rod mechanism 1-3, an oil way 1-4 and a shaft hole positioning groove 1-5; the two-rod mechanism 1-3 is arranged on the handle 1-2, one end of the two-rod mechanism is connected with the handle, and the other end of the two-rod mechanism is connected with the power cylinder piston 2-1, so that the power cylinder piston 2-1 is driven to move to realize hydraulic transmission; the oil paths 1-4 are fixed through grooves on the main rod, so that hydraulic oil is conveyed; the shaft hole positioning groove 1-5 is fixed at the head of the main rod 1-1 and used for fixing the pin pulling device at the shaft end of the cotter pin installation shaft, so that the pin pulling is facilitated.
The power cylinder is fixed on the main rod 1-1 and mainly comprises a power cylinder piston 2-1 and a power cylinder oil cylinder 2-2; one end of a power cylinder piston 2-1 is linked with a two-rod mechanism 1-3; the power cylinder oil cylinder 2-2 is fixedly connected with the main rod 1-1.
The pin-bundling stroke cylinder is fixed at one side of the head end of the main rod 1-1 and mainly comprises a stroke cylinder piston 3-1, a stroke cylinder oil cylinder 3-2, a stroke cylinder piston cover 3-3, a beam-converging and angle-splitting component 3-4 and a limiting device 3-5; the stroke cylinder oil cylinder 3-2 is fixedly connected with the main rod 1-1, and an opening is arranged on the oil cylinder and is connected with the oil way 1-4, so that hydraulic oil can flow into the stroke cylinder oil cylinder 3-2; the stroke cylinder piston 3-1 is matched with the stroke cylinder oil cylinder 3-2 and can move relatively under the action of hydraulic oil; meanwhile, the connecting rod of the stroke cylinder piston 3-1 is improved, and a limiting device 3-5 is added to limit the stroke; the stroke cylinder piston cover 3-3 is fixed on the stroke cylinder piston 3-1 by pins and is used for realizing the transmission of the movement of the stroke cylinder piston 3-1; the opening angle of the lower end of the convergent split cotter pin is reasonably split through the convergent split angle component 3-4 fixed on the stroke cylinder piston cover 3-3, so that the cotter pin is pulled out.
The pin pulling boosting cylinder is fixed on the other side of the head end of the main rod 1-1 and mainly comprises a boosting cylinder piston 4-1, a boosting cylinder oil cylinder 4-2, a boosting cylinder piston cover 4-3 and a pin pulling sharp-nose hook piece 4-4; the booster cylinder oil cylinder 4-2 is fixedly connected with the main rod 1-1, and an opening is formed in the oil cylinder and connected with the oil way 1-4, so that hydraulic oil can flow into the booster cylinder oil cylinder 4-2; the booster cylinder piston 4-1 is matched with the booster cylinder oil cylinder 4-2, and can relatively move under the action of hydraulic oil; the reinforcement cylinder piston cover 4-3 is fixed on the reinforcement cylinder piston 4-1 by pins and is used for realizing the transmission of the movement of the reinforcement cylinder piston 4-1; the pin pulling sharp-mouth hook 4-4 is fixed on the booster cylinder piston cover 4-3, and the vertical movement of the pin pulling sharp-mouth hook 4-4 is driven by the movement of the booster cylinder piston 4-1 to pull out the cotter pin.
Compared with the prior art, the invention has the beneficial effects that:
(1) The shaft end limiting pin can be pulled out by a single person in a single step, so that the traditional multi-person step operation mode is improved;
(2) Compared with the prior art, the invention has the greatest difference that the pin pulling speed and the pin pulling efficiency are greatly improved, and the pin pulling tool is efficient and labor-saving;
(3) The hydraulic cylinder is reasonably designed correspondingly, so that the split angle convergence of the cotter pin and the pulling of the cotter pin are stably connected, the direction of the force applied by the cotter pin is ensured to be coaxial with the pulling direction of the cotter pin, and the loss of the force of the cotter pin is reduced;
(4) In the using process of the device, the force transmitted by the hydraulic system is controllable and stable, and the cotter pin can be prevented from being damaged by excessive pin pulling force.
Drawings
Fig. 1 is a hydraulic power assisted pin pulling device of the present invention.
Fig. 2 is a mechanical shear clamp of the hydraulic power assisted pin pulling device of the invention.
Fig. 3 is a cylinder of the hydraulic power assisted pin pulling device of the present invention.
Fig. 4 is a pin bushing travel cylinder of the hydraulic power assisted pin pulling device of the present invention.
Fig. 5 shows a pin pulling reinforcement cylinder of the hydraulic power-assisted pin pulling device.
Reference numerals: 1 is a mechanical shear clamp; 1-1 is a main rod; 1-2 is a handle; 1-3 is a two-bar mechanism; 1-4 is an oil way; 1-5 shaft hole positioning grooves; 2 is a power cylinder; 2-1 is a power cylinder piston, and 2-2 is a power cylinder oil cylinder; 3 is a pin bundling stroke cylinder; 3-1 is a stroke cylinder piston; 3-2 is a stroke cylinder; 3-3 is a stroke cylinder piston cover; 3-4 is a beam-converging and angle-splitting component; 3-5 is a limiting device; 4 is a pin pulling boosting cylinder; 4-1 is a booster cylinder piston; 4-2 is a booster cylinder; 4-3 is a reinforcement cylinder piston cover; 4-4 is a pin pulling sharp-nose hook.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and detailed description:
as shown in figure 1, the hydraulic power-assisted pin pulling device comprises a mechanical shear clamp 1, a power cylinder 2, a pin bundling stroke cylinder 3 and a pin pulling boosting cylinder 4; the power cylinder 2, the pin bundling travel cylinder 3 and the pin pulling reinforcement cylinder 4 are all arranged and fixed on the mechanical shear pliers 1; the power cylinder 2 outputs hydraulic oil with pressure under the action of the mechanical shear pliers 1 and transmits the hydraulic oil to the pin bundling stroke cylinder 3 and the pin pulling boosting cylinder 4 through oil ways, so that the acting force of pin bundling and pin pulling is generated, and the pin pulling function is realized.
As shown in figure 2, the mechanical shear clamp 1 of the invention consists of a main rod 1-1, a handle 1-2, a two-rod mechanism 1-3, an oil way 1-4 and a shaft hole positioning groove 1-5; the two-rod mechanism 1-3 is arranged on the handle 1-2, one end of the two-rod mechanism is connected with the handle, and the other end of the two-rod mechanism is connected with the power cylinder piston 2-1, so that the power cylinder piston 2-1 is driven to move to realize hydraulic transmission; the oil paths 1-4 are fixed through grooves on the main rod, so that hydraulic oil is conveyed; the shaft hole positioning groove 1-5 is fixed at the head of the main rod 1-1 and used for fixing the pin pulling device at the shaft end of the cotter pin installation shaft, so that the pin pulling is facilitated.
As shown in figure 3, the power cylinder 2 of the invention is fixed on a main rod 1-1 and mainly comprises a power cylinder piston 2-1 and a power cylinder 2-2; one end of the power cylinder piston 2-1 is linked with the two-rod mechanism 1-3.
As shown in figure 4, the pin-binding travel cylinder 3 is fixed on one side of the head end of a main rod 1-1 and mainly comprises a travel cylinder piston 3-1, a travel cylinder 3-2, a travel cylinder piston cover 3-3, a beam-shrinking and angle-splitting component 3-4 and a limiting device 3-5; the stroke cylinder oil cylinder 3-2 is fixedly connected with the main rod 1-1, and an opening is arranged on the oil cylinder and is connected with the oil way 1-4, so that hydraulic oil can flow into the stroke cylinder oil cylinder 3-2; the stroke cylinder piston 3-1 is matched with the stroke cylinder oil cylinder 3-2 and can move relatively under the action of hydraulic oil; meanwhile, the connecting rod of the stroke cylinder piston 3-1 is improved, and a limiting device 3-5 is added to limit the stroke; the stroke cylinder piston cover 3-3 is fixed on the stroke cylinder piston 3-1 by pins and is used for realizing the transmission of the movement of the stroke cylinder piston 3-1; the opening angle of the lower end of the convergent split cotter pin is reasonably split through the convergent split angle component 3-4 fixed on the stroke cylinder piston cover 3-3, so that the cotter pin is pulled out.
As shown in figure 5, the pin pulling force-increasing cylinder 4 is fixed on the other side of the head end of the main rod 1-1 and mainly comprises a force-increasing cylinder piston 4-1, a force-increasing cylinder oil cylinder 4-2, a force-increasing cylinder piston cover 4-3 and a pin pulling sharp-nose hook 4-4; the booster cylinder oil cylinder 4-2 is fixedly connected with the main rod 1-1, and an opening is formed in the oil cylinder and connected with the oil way 1-4, so that hydraulic oil can flow into the booster cylinder oil cylinder 4-2; the booster cylinder piston 4-1 is matched with the booster cylinder oil cylinder 4-2, and can relatively move under the action of hydraulic oil; the reinforcement cylinder piston cover 4-3 is fixed on the reinforcement cylinder piston 4-1 by pins and is used for realizing the transmission of the movement of the reinforcement cylinder piston 4-1; the pin pulling sharp-mouth hook 4-4 is fixed on the booster cylinder piston cover 4-3, and the vertical movement of the pin pulling sharp-mouth hook 4-4 is driven by the movement of the booster cylinder piston 4-1 to pull out the cotter pin.
The working principle of the hydraulic power-assisted pin pulling device of the invention is described in detail below with reference to figures 1 to 5.
Before the cotter pin at the shaft end of the mechanical structure is pulled out, the shaft hole positioning groove 1-5 of the mechanical shear clamp 1 of the device is aligned and propped on the shaft end, the pin pulling sharp mouth hook piece 4-4 is hooked into the hole of the cotter pin, the converging and angle splitting component 3-4 is arranged at the opening of the cotter pin, and an operator checks and measures whether the hydraulic oil way 1-4 is normal or not. When the pin is pulled out, the main rod 1-1 and the handle 1-2 of the mechanical shear clamp 1 are held, the handle 1-2 is pressed towards the main rod 1-1, and the two-rod mechanism 1-3 and the power cylinder piston 2-1 are driven to move in the pressing process, so that pressure is generated by hydraulic oil. The hydraulic oil firstly injects oil into the pin bundling stroke cylinder 3 with smaller load pressure through the oil way 1-4, the stroke cylinder piston 3-1 and the stroke cylinder piston cover 3-3 are pushed to move downwards, and then the beam-converging angle-splitting component 3-4 is driven to move downwards so as to reduce the angle of splitting until reaching a limiting position, and the angle of splitting is reduced to a proper value. Because the limiting device 3-5 limits the stroke, the oil way 1-4 cannot continuously inject oil to the pin-binding stroke cylinder 3, the steering pin-pulling reinforcement cylinder 4 injects oil, the reinforcement cylinder piston 4-1 drives the pin-pulling sharp-mouth component 4-4 to linearly move, and a large pulling force is generated in the pin pulling direction to pull out the cotter pin.
The hydraulic power-assisted pin pulling device and the pin pulling method have the advantages of reliable oil path tightness, proper boosting ratio and stroke, lighter weight of the whole machine, simple and convenient operation and use, quick and convenient pin pulling process and safe and reliable work.
The present invention has been described in detail with the purpose of enabling those skilled in the art to understand and practice the present invention, but not to limit the scope of the present invention, and the present invention is not limited to the above-described embodiments, and all equivalent changes or modifications according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (1)
1. A method for pulling a pin by using a hydraulic power-assisted pin pulling device, which is characterized in that: the hydraulic power-assisted pin pulling device consists of four parts, namely a mechanical shear clamp (1), a power cylinder (2), a pin bundling stroke cylinder (3) and a pin pulling reinforcement cylinder (4);
the mechanical shearing pliers are composed of a main rod (1-1), a handle (1-2), a two-rod mechanism (1-3), an oil way (1-4) and a shaft hole positioning groove (1-5); wherein the two-rod mechanism (1-3) is arranged on the handle (1-2), one end of the two-rod mechanism is connected with the handle, and the other end of the two-rod mechanism is connected with the power cylinder piston (2-1), so that the power cylinder piston (2-1) is driven to move to realize hydraulic transmission; the oil way (1-4) is fixed through a slot on the main rod, so that the hydraulic oil is conveyed; the shaft hole positioning groove (1-5) is fixed at the head of the main rod (1-1) and is used for fixing the pin pulling device at the shaft end of the cotter pin installation shaft so as to facilitate pin pulling;
the power cylinder is fixed on the main rod (1-1) and mainly comprises a power cylinder piston (2-1) and a power cylinder oil cylinder (2-2); one end of a power cylinder piston (2-1) is linked with the two-rod mechanism (1-3); the power cylinder oil cylinder (2-2) is fixedly connected with the main rod (1-1);
the pin-bundling stroke cylinder is fixed at one side of the head end of the main rod (1-1) and mainly comprises a stroke cylinder piston (3-1), a stroke cylinder oil cylinder (3-2), a stroke cylinder piston cover (3-3), a beam-converging and angle-splitting component (3-4) and a limiting device (3-5); the stroke cylinder oil cylinder (3-2) is fixedly connected with the main rod (1-1), and an opening is arranged on the oil cylinder and is connected with the oil way (1-4) so that hydraulic oil can flow into the stroke cylinder oil cylinder (3-2); the stroke cylinder piston (3-1) is matched with the stroke cylinder oil cylinder (3-2) and can move relatively under the action of hydraulic oil; meanwhile, a connecting rod of a stroke cylinder piston (3-1) is improved, and a limiting device (3-5) is added to limit the stroke; the stroke cylinder piston cover (3-3) is fixed on the stroke cylinder piston (3-1) by a pin and is used for realizing the transmission of the movement of the stroke cylinder piston (3-1); the opening angle of the lower end of the cotter pin is reasonably converged through the converging angle splitting component (3-4) fixed on the stroke cylinder piston cover (3-3), so that the cotter pin is pulled out;
the pin pulling boosting cylinder is fixed on the other side of the head end of the main rod (1-1) and mainly comprises a boosting cylinder piston (4-1), a boosting cylinder oil cylinder (4-2), a boosting cylinder piston cover (4-3) and a pin pulling tip hook piece (4-4); the boosting cylinder oil cylinder (4-2) is fixedly connected with the main rod (1-1), and an opening is arranged on the oil cylinder and is connected with the oil way (1-4) so that hydraulic oil can flow into the boosting cylinder oil cylinder (4-2); the booster cylinder piston (4-1) is matched with the booster cylinder oil cylinder (4-2) and can move relatively under the action of hydraulic oil; the booster cylinder piston cover (4-3) is fixed on the booster cylinder piston (4-1) by pins and is used for realizing the transmission of the movement of the booster cylinder piston (4-1); the pin pulling sharp-mouth hook piece (4-4) is fixed on the booster cylinder piston cover (4-3), and the vertical movement of the pin pulling sharp-mouth hook piece (4-4) is driven by the movement of the booster cylinder piston (4-1) to pull out the cotter pin;
the cylinder diameter of the pin bundling stroke cylinder (3) is smaller than that of the pin pulling reinforcement cylinder (4), and the pin bundling resistance is smaller, so that hydraulic oil of the power cylinder (2) is injected into the pin pulling reinforcement cylinder (4) firstly, and the pin bundling and angle splitting component (3-4) is driven to move so as to reduce the split angle of the split pin, thereby pulling the pin;
the mechanical shear pliers (1) can realize a primary reinforcement effect due to the lever design of the handle (1-2), and the cylinder diameter of the pin pulling reinforcement cylinder (4) is larger than that of the power cylinder (2), so that a secondary reinforcement effect is realized through hydraulic transmission, the portability of pin pulling operation can be effectively improved through two-stage reinforcement, and the efficiency is improved; before the cotter pin at the shaft end of the mechanical structure is pulled out, a shaft hole positioning groove (1-5) of the mechanical shear clamp (1) is aligned and propped against the shaft end, a pin pulling sharp-nose hook piece (4-4) is hooked into a hole of the cotter pin, a beam-converging angle-splitting component (3-4) is arranged at the opening of the cotter pin, and an operator checks and measures whether a hydraulic oil way (1-4) is normal; when the pin is pulled out, the main rod (1-1) and the handle (1-2) of the mechanical shear clamp (1) are held, the handle (1-2) is pressed towards the main rod (1-1), and the two-rod mechanism (1-3) and the power cylinder piston (2-1) are driven to move in the pressing process, so that the hydraulic oil generates pressure; the hydraulic oil firstly injects oil into the pin-binding travel cylinder (3) with smaller load pressure through the oil way (1-4), pushes the travel cylinder piston (3-1) and the travel cylinder piston cover (3-3) to move downwards, and further drives the beam-shrinking angle-cleaving component (3-4) to move downwards so as to reduce the angle of cleaving until reaching a limiting position, and the angle of cleaving is reduced to a proper value; because the limiting device (3-5) limits the stroke, the oil way (1-4) cannot continuously inject oil to the pin-binding stroke cylinder (3), the steering pin-pulling boosting cylinder (4) injects oil, the pin-pulling sharp mouth component (4-4) is driven to linearly move by the boosting cylinder piston (4-1), and a large pulling force is generated in the pin pulling direction to pull out the cotter pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810414034.3A CN108544422B (en) | 2018-05-03 | 2018-05-03 | Hydraulic power-assisted pin pulling device and pin pulling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810414034.3A CN108544422B (en) | 2018-05-03 | 2018-05-03 | Hydraulic power-assisted pin pulling device and pin pulling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108544422A CN108544422A (en) | 2018-09-18 |
| CN108544422B true CN108544422B (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810414034.3A Active CN108544422B (en) | 2018-05-03 | 2018-05-03 | Hydraulic power-assisted pin pulling device and pin pulling method |
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| US1336938A (en) * | 1919-10-22 | 1920-04-13 | William E Aylor | Cotter-extractor |
| GB149140A (en) * | 1919-09-03 | 1920-08-12 | Thomas Speers | A device for withdrawing split pins |
| CN201267979Y (en) * | 2008-09-11 | 2009-07-08 | 宝山钢铁股份有限公司 | Retainer pin detaching device |
| CN201856224U (en) * | 2010-10-31 | 2011-06-08 | 河南省电力公司洛阳供电公司 | Device for taking out cotter pin |
| CN104290074A (en) * | 2014-09-02 | 2015-01-21 | 国网安徽省电力公司阜阳供电公司 | Cotter pulling tool |
| CN205057466U (en) * | 2015-10-20 | 2016-03-02 | 眉山恒升机械装备有限公司 | Split pin extrusion extracting tool |
| CN107351021A (en) * | 2017-06-26 | 2017-11-17 | 中船动力有限公司 | Pin removal and method of pulling pin |
| CN206662669U (en) * | 2017-03-14 | 2017-11-24 | 上海铁路局南京东车辆段 | Goods train vehicle bogie split pin demountor |
| CN208358688U (en) * | 2018-05-03 | 2019-01-11 | 华东交通大学 | A kind of pin pulling out device based on hydraulic drive power-assisted |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN216830691U (en) * | 2021-12-30 | 2022-06-28 | 郑州铁总智能科技有限公司 | Electric flat pin clamp |
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB149140A (en) * | 1919-09-03 | 1920-08-12 | Thomas Speers | A device for withdrawing split pins |
| US1336938A (en) * | 1919-10-22 | 1920-04-13 | William E Aylor | Cotter-extractor |
| CN201267979Y (en) * | 2008-09-11 | 2009-07-08 | 宝山钢铁股份有限公司 | Retainer pin detaching device |
| CN201856224U (en) * | 2010-10-31 | 2011-06-08 | 河南省电力公司洛阳供电公司 | Device for taking out cotter pin |
| CN104290074A (en) * | 2014-09-02 | 2015-01-21 | 国网安徽省电力公司阜阳供电公司 | Cotter pulling tool |
| CN205057466U (en) * | 2015-10-20 | 2016-03-02 | 眉山恒升机械装备有限公司 | Split pin extrusion extracting tool |
| CN206662669U (en) * | 2017-03-14 | 2017-11-24 | 上海铁路局南京东车辆段 | Goods train vehicle bogie split pin demountor |
| CN107351021A (en) * | 2017-06-26 | 2017-11-17 | 中船动力有限公司 | Pin removal and method of pulling pin |
| CN208358688U (en) * | 2018-05-03 | 2019-01-11 | 华东交通大学 | A kind of pin pulling out device based on hydraulic drive power-assisted |
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| Publication number | Publication date |
|---|---|
| CN108544422A (en) | 2018-09-18 |
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