CN106041827A - Demounting and mounting device of valve lock clamp - Google Patents
Demounting and mounting device of valve lock clamp Download PDFInfo
- Publication number
- CN106041827A CN106041827A CN201610502332.9A CN201610502332A CN106041827A CN 106041827 A CN106041827 A CN 106041827A CN 201610502332 A CN201610502332 A CN 201610502332A CN 106041827 A CN106041827 A CN 106041827A
- Authority
- CN
- China
- Prior art keywords
- base
- valve
- pressure plate
- fixation clip
- detaching apparatus
- 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.)
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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
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
- B25B27/24—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same mounting or demounting valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Clamps And Clips (AREA)
Abstract
The invention provides a demounting and mounting device of a valve lock clamp. The demounting and mounting device comprises a base, a first locating stud, a fixed press plate, a compression bolt, a rotary press plate and a second locating stud. The two ends of the fixed press plate are fixed to the base through the first locating stud and the compression bolt correspondingly. The rotary press plate comprises a threaded rod structure on the upper portion, a bearing structure on the middle portion and a bottom plate structure on the lower portion from top to bottom, wherein the threaded rod structure, the bearing structure and the bottom plate structure are connected in sequence. The threaded rod structure is in threaded connection with the fixed press plate. A rotary mechanism is arranged in the middle of the bearing structure. A concave hole structure with the number corresponding to that of a valve with a demounting air cylinder cover is arranged on the bottom plate structure. The second locating stud penetrates the fixed press plate to be inserted in the bottom plate structure for locating. The demounting and mounting device has the following beneficial effects that large-scale, high-strength and high-efficiency demounting and assembling work of the valve lock clamp in the multi-valve air cylinder cover of an internal combustion engine can be met, and one-person operation can be achieved; and structural design is reasonable, implementation is easy, and demounting and mounting efficiency is high.
Description
Technical field
The invention belongs to dismounting engine frock technical field, especially relate to a kind of valve collet attaching/detaching apparatus.
Background technology
Valve is one of strength member of engine valve actuating mechanism, and working condition is extremely severe, the work temperature of head portion that
Spend the highest, optimizing profile and reducing on the premise of moving-mass, also to ensure enough intensity, rigidity, heat-resisting and wear-resisting energy
Power.The up and down motion that valve guide bushing is valve stem provides guide effect, is an important heat dissipation channel of valve.Worked at it
Cheng Zhong, the expansion brought by suction and the temperature rising of valve, machine oil can play lubrication automatically into rubbing surface;
When the engine is not operating, because of capillarity, machine oil is inhaled into again in hole, fabulous the protecting of this self-lubricating property
Engine valve stem.
If the gap between valve stem and valve guide bushing is overproof, machine oil can enter combustor or exhaust duct from gap location, draws
Play aerofluxus and emit blue smoke;If through working long hours, causing its excesssive gap, vacillating now to the left, now to the right when valve reciprocation, cause
Valve oil seal oil sealing was lost efficacy, and this type of fault is often accompanied by the phenomenons such as starting difficulty, cylinder head noise is big, be short of power;Even more serious
Situation, when inlet valve conduit loosen, air intake duct inner engine oil can be caused to infiltrate, burn oil phenomenon is obvious;When exhaust valve guide pine
Time dynamic, high-temperature fuel gas can be scurried in crankcase ventilation system, causes valve spring inefficacy, oil temperature drastically to raise and electromotor
The phenomenon such as overheated, jeopardizes the operation safety of complete machine.Therefore, regularly, targetedly inlet and exhaust valve and corresponding valve are led
Pipe carries out status checkout and dimensional measurement, be ensure engine stabilizer run important detection project, to promote electromotor work
Make the stability of state and have very important meaning service life.
(such as accompanying drawing 7) in air distribution structure, it is necessary to first remove valve collet 10, valve spring 11, spring could be removed
Seat and inlet and exhaust valve 12, carry out corresponding status checkout and dimensional measurement afterwards.In prior art, remove and cylinder is installed
During the valve collet covered, need three people to operate just simultaneously and can complete following operating procedure: 1 people fixes cylinder head, 1 people uses single gas
Grille clip 10 is removed frock and valve spring 11 is compressed, 1 people use bar magnet or other instruments carry out valve collet 10 dismounting and
Installing, the frock that attaching/detaching apparatus Position location accuracy is poor, person works's efficiency is low, there is also operational error causes gets loose or locker flies
Spatter the personal security risk caused.
Therefore, existing valve collet dismounting method and apparatus can not meet high-volume, high intensity, high efficiency dismounting
Demand, needs to develop a kind of new-type valve collet attaching/detaching apparatus to meet real work demand.
Summary of the invention
In view of this, it is contemplated that propose a kind of valve collet attaching/detaching apparatus, with satisfied high-volume, high intensity, efficiently
The valve collet of rate is removed and assembly work.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
A kind of valve collet attaching/detaching apparatus, including base, the first positioning stud, fixation clip, hold-down bolt, rotary pressure plate
With the second positioning stud,
Described base is provided with the location structure of positioning belt dismounting cylinder head, and the two ends of described fixation clip are respectively by the
One positioning stud and hold-down bolt are fixed on base;
The threaded rod structure on top that described rotary pressure plate includes being sequentially connected with from top to bottom, the carrying structure at middle part and under
The base arrangement in portion, described threaded rod structure threadeds with fixation clip, and the centre of described carrying structure is provided with and realizes screw thread
The rotating mechanism that bar structure and base arrangement split rotate, described base arrangement is provided with dismantles cylinder head valve quantity pair with band
The shrinkage pool structure answered;Described second positioning stud inserts base arrangement through fixation clip and positions.
Further, the middle part of described fixation clip is provided with the hollow structure of bottom opening, the top of hollow structure and rotation
The threaded rod structure turning pressing plate is threaded, and the inner chamber of described hollow structure is that gap is joined with the carrying structure external diameter of rotary pressure plate
Close.
Further, described fixation clip is rhombus flange arrangement, and the side of described rhombus flange arrangement is provided with two and determines
Hole, position, the diameter in hole, two location forms gap with the diameter dimension on the first positioning stud and the top of the second positioning stud respectively
Coordinating, the opposite side of rhombus flange arrangement is provided with the spacious pore structure coordinating hold-down bolt top.
Further, described carrying structure can use the bearing arrangement that self-lubricating material structure maybe can carry.
Further, described location structure includes that the cylindrical positioning table being provided with in the middle part of base upper surface and edge are provided with
Some fixing holes, alignment pin is installed in fixing hole.
Further, the top surface edge of described base is provided with two about the centrosymmetric screwed hole of base, two institutes
State screwed hole to be respectively intended to spin one end of the first positioning stud and hold-down bolt.
Further, the bottom of described first positioning stud is provided with the screw thread that the screwed hole with base coordinates, and top is provided with
With the screw thread of nut screw connection, middle part is platform structure.
Further, the top of the threaded rod structure on described rotary pressure plate top is provided with general-purpose interface.
Relative to prior art, present invention have the advantage that
(1) valve lock during apparatus of the present invention can meet high-volume, high intensity, the many valve cylinder covers of high efficiency internal combustion engine
The dismounting of folder and assembly work, can realize one man operation, reasonable in design, easily realize, and dismounting efficiency is high.
(2) positioning table and the alignment pin that utilize base realize cylinder head and the location of valve collet dismounting device coordinate system;
The cooperation utilizing the hole, location on fixation clip and the first positioning stud Upper cylindrical position realizes fixation clip and valve collet
Remove the location of device coordinate system, it is ensured that cylinder head and valve collet remove the central alignment of frock;Utilize the first positioning stud,
Nut and hold-down bolt ensure when turning moment is applied on rotary pressure plate, the horizontal level of positioning pressuring plate;Second is utilized to determine
Position stud rotary pressure plate central alignment, and limit rotary pressure plate lower raft structure in the horizontal direction rotate from by
Degree.
(3) quantity and the version of the shrinkage pool in rotary pressure plate lower raft structure can be according to the knot of cylinder head to be dismounted
Structure determines;This device is possible not only to meet the dismounting of single-body type cylinder head valve collet, also can carry out array to meet monoblock type
The dismounting work of cylinder head valve collet.
Accompanying drawing explanation
The accompanying drawing of the part constituting the present invention is used for providing a further understanding of the present invention, and the present invention's is schematic real
Execute example and illustrate for explaining the present invention, being not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the overall structure schematic diagram of valve collet attaching/detaching apparatus of the present invention;
In Fig. 2, a, b, c are respectively the axonometric chart of fixation clip of the present invention, sectional view and top view;
In Fig. 3, a, b, c are respectively the axonometric chart of rotary pressure plate of the present invention, front view and top view;
Fig. 4-6 is the process schematic utilizing valve collet attaching/detaching apparatus of the present invention dismounting valve collet;
Fig. 7 is the structural representation that the present invention dismounts object.
Description of reference numerals:
1-base, 2-alignment pin, 3-the first positioning stud, 4-fixation clip, 5-nut, 6-hold-down bolt, 7-rotates pressure
Plate, 8-the second positioning stud, 9-spring holder, 10-valve collet, 11-valve spring, 12-valve.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Combination mutually.
Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
A kind of valve collet attaching/detaching apparatus, as shown in Figures 1 to 3, including base the 1, first positioning stud 3, fixation clip 4,
Hold-down bolt 6, rotary pressure plate 7 and the second positioning stud 8,
Described base 1 is provided with the location structure of positioning belt dismounting cylinder head;The two ends of described fixation clip 4 are passed through respectively
First positioning stud 3 and hold-down bolt 6 are fixed on base 1;
The threaded rod structure on top that described rotary pressure plate 7 includes being sequentially connected with from top to bottom, the carrying structure at middle part and
The base arrangement of bottom;
Described threaded rod structure is threadeded with fixation clip 4, it is achieved it moves up and down;
The acting as of described carrying structure connects, carrying and anti-attrition, its upper and lower both sides respectively with the threaded rod structure on top
Fixing with the base arrangement of bottom, the centre of carrying structure is provided with rotating mechanism, can realize carrying the screw thread of the upper and lower both sides of structure
The split of bar structure and base arrangement rotates;
Described base arrangement is provided with the shrinkage pool structure corresponding with band dismounting cylinder head valve quantity, it is simple to rotary pressure plate 7
After valve spring is compressed, the dismounting of valve collet and installation;
Described second positioning stud 8 inserts base arrangement through fixation clip 4 and positions.
Described fixation clip 4 is rhombus flange arrangement, and the middle part of rhombus flange arrangement is provided with the hollow structure of bottom opening,
Threaded with the threaded rod structure of rotary pressure plate 7 in the top of hollow structure, the inner chamber of described hollow structure and rotary pressure plate 7
Carrying structure external diameter is matched in clearance;
The side of described rhombus flange arrangement positions hole, hole, two location according to the dimensioned two away from center X1, X2
Diameter form matched in clearance, rhombus flange with the diameter dimension on the first positioning stud 3 and the top of the second positioning stud 8 respectively
The opposite side of structure is provided with the spacious pore structure coordinating hold-down bolt 6 top, by the first positioning stud 3, nut 5 and hold-down bolt
The 6 pairs of fixation clips 4 position on base 1 positions, and the height of fixation clip 4 is by the first positioning stud 3 and compresses spiral shell
The screw thread that bolt 6 is connected with base 1 is adjusted.
Described carrying structure can use the bearing arrangement that self-lubricating material structure maybe can carry, and effect is when rotary pressure plate 7
During the threaded rod structure downward operation on top, reduce the friction of carrying structure and base arrangement contact surface, prevent because friction is produced
Life is adhered, and ultimately results in operation clamping stagnation.
The edge of described base arrangement is with the screwed hole away from center X2 dimensioned Yu the second positioning stud 8 threaded engagement.
If it is solid that described location structure includes that cylindrical positioning table that base 1 upper surface middle part is provided with and edge are provided with
Determine hole, alignment pin 2 is installed in fixing hole, if the baseplane of cylinder head to be dismounted is without shrinkage pool, then can arrange in base 1 that two are determined
Position pin 2, removes the fixing of front air cylinder lid for valve collet, and base 1 will be waited to dismount by cylindrical positioning table and alignment pin 2
Cylinder head is fixed.
The top surface edge of described base 1 is provided with two about the centrosymmetric screwed hole of base, two described screwed holes
Being respectively intended to spin the first positioning stud 3 and one end of hold-down bolt 6, scalable fixation clip 4 is relative to the distance of base 1.
The bottom of described first positioning stud 3 is provided with the screw thread that the screwed hole with base 1 coordinates, and top is provided with and nut 5
The screw thread coordinated, middle part is platform structure.
One end of described second positioning stud 8 is passed through to be threaded into rotation pressure behind the hole, a location of fixation clip 4
In screwed hole on the base arrangement of plate 7 bottom, limit the horizontal rotation degree of freedom of rotary pressure plate 7.
The top of the threaded rod structure on described rotary pressure plate 7 top is provided with general-purpose interface, can be four directions, six sides or other
Common interfaces, for the applying of turning moment.
As shown in Figs. 4-6, the operating process for application apparatus of the present invention dismounting valve collet is:
1) positioning table and the structure of alignment pin 2, quantity and the installation position of base 1 is determined according to air cylinder head structure form to be torn open
Put;Profile according to cylinder head determines size X1 in fixation clip 4 and rotary pressure plate 7 and X2;Layout according to inlet and exhaust valve
Form determines quantity and the version of shrinkage pool in rotary pressure plate 7 lower raft;
2) alignment pin 2 is arranged on base 1;
3) rotary pressure plate 7 is installed the correspondence position in the middle part of fixation clip 4 by the helicitic texture on its top;
4) by the second positioning stud 8 through the hole, location of fixation clip 3 a size of X2 away from center, fixed by helicitic texture
On the base arrangement of rotary pressure plate 7 bottom, limit its horizontal rotation degree of freedom;
5) by helicitic texture, positioning stud 3 being arranged on base 1 correspondence position, height is true according to cylinder head to be dismounted
Fixed;
6) entity of fixation clip 4 and rotary pressure plate 7 is installed on positioning stud 3, the hole, location in fixation clip 4
With the cylindrical section matched in clearance of positioning stud 3, nut 5 is utilized slightly to be tightened by fixation clip 4 afterwards;
7) hold-down bolt 6 is arranged on by helicitic texture the correspondence position of base 1, rotates fixation clip 4, pass through one
The spacious pore structure of side is fitted with hold-down bolt 6 side, slightly tightens hold-down bolt so that it is contact with fixation clip 4, it is ensured that fixing
Pressing plate 4 is in holding level together with rotary pressure plate 7.So far valve collet attaching/detaching apparatus preparation completes;
8) by the entity of fixation clip 4 and rotary pressure plate 7 to external rotation, as shown in Figure 4;
9) cylinder head to be dismounted is arranged on base 1 by positioning table and alignment pin, as shown in Figure 5;
10) rotary pressure plate entity is fitted with hold-down bolt 6, and adjusting nut 5 and hold-down bolt 6 are to ensure pressing plate entity
It is horizontal;
11) utilizing the universal joint on rotary pressure plate 7 top, the threaded rod structure by rotary pressure plate 7 top is downward clockwise
Tighten, till compression valve spring 11 makes valve collet 10 installation site be completely exposed, as shown in Figure 6;
12) instruments such as bar magnet are utilized to carry out installation and the dismounting of valve collet 10;
13) counterclockwise rotary pressure plate 7 is upwards unclamped, depart from valve spring 11 to base arrangement, to the fixing pressure of external rotation
Plate 4, takes out cylinder head from frock, completes the installation of corresponding valve collet and removes work.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (8)
1. a valve collet attaching/detaching apparatus, it is characterised in that: include base (1), the first positioning stud (3), fixation clip
(4), hold-down bolt (6), rotary pressure plate (7) and the second positioning stud (8),
Described base (1) is provided with the location structure of positioning belt dismounting cylinder head, and the two ends of described fixation clip 4 are respectively by the
One positioning stud (3) and hold-down bolt (6) are fixed on base (1);
The threaded rod structure on top that described rotary pressure plate (7) includes being sequentially connected with from top to bottom, the carrying structure at middle part and under
The base arrangement in portion, described threaded rod structure threadeds with fixation clip (4), and the centre of described carrying structure is provided with and realizes spiral shell
The rotating mechanism that rasp bar structure and base arrangement split rotate, described base arrangement is provided with dismantles cylinder head valve quantity with band
Corresponding shrinkage pool structure;Described second positioning stud (8) is inserted base arrangement through fixation clip (4) and is positioned.
Valve collet attaching/detaching apparatus the most according to claim 1, it is characterised in that: the middle part of described fixation clip (4) sets
Having the hollow structure of bottom opening, threaded with the threaded rod structure of rotary pressure plate (7) in the top of hollow structure, described hollow
The inner chamber of structure is matched in clearance with the carrying structure external diameter of rotary pressure plate (7).
Valve collet attaching/detaching apparatus the most according to claim 1 and 2, it is characterised in that: described fixation clip (4) is rhombus
Flange arrangement, the side of described rhombus flange arrangement is provided with hole, two location, and the diameter in hole, two location positions with first respectively
The diameter dimension on the top of stud (3) and the second positioning stud (8) forms matched in clearance, and the opposite side of rhombus flange arrangement is provided with
Coordinate the spacious pore structure on hold-down bolt (6) top.
Valve collet attaching/detaching apparatus the most according to claim 1, it is characterised in that: described carrying structure can use self-lubricating
The bearing arrangement that material structure maybe can carry.
Valve collet attaching/detaching apparatus the most according to claim 1, it is characterised in that: described location structure includes base (1)
Some fixing holes that the positioning table of the cylinder that upper surface middle part is provided with and edge are provided with, install alignment pin (2) in fixing hole.
Valve collet attaching/detaching apparatus the most according to claim 1, it is characterised in that: the top surface edge of described base (1)
Be provided with two about the centrosymmetric screwed hole of base, two described screwed holes be respectively intended to spin the first positioning stud (3) and
One end of hold-down bolt (6).
Valve collet attaching/detaching apparatus the most according to claim 6, it is characterised in that: under described first positioning stud (3)
Portion is provided with the screw thread that the screwed hole with base (1) coordinates, and top is provided with the screw thread coordinated with nut (5), and middle part is platform structure.
Valve collet attaching/detaching apparatus the most according to claim 1, it is characterised in that: the spiral shell on described rotary pressure plate (7) top
The top of rasp bar structure is provided with general-purpose interface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201610502332.9A CN106041827B (en) | 2016-06-29 | 2016-06-29 | A kind of valve collet attaching/detaching apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201610502332.9A CN106041827B (en) | 2016-06-29 | 2016-06-29 | A kind of valve collet attaching/detaching apparatus |
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Publication Number | Publication Date |
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CN106041827A true CN106041827A (en) | 2016-10-26 |
CN106041827B CN106041827B (en) | 2018-05-15 |
Family
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CN201610502332.9A Active CN106041827B (en) | 2016-06-29 | 2016-06-29 | A kind of valve collet attaching/detaching apparatus |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106493551A (en) * | 2016-12-28 | 2017-03-15 | 沪东重机有限公司 | A kind of electrodynamic type valve collet tool for fastening/disengaging |
CN107717843A (en) * | 2017-11-13 | 2018-02-23 | 利欧集团浙江泵业有限公司 | Semi-automatic oil sealing oiling pressing machine |
CN108465969A (en) * | 2018-06-05 | 2018-08-31 | 法兰泰克重工股份有限公司 | A kind of device of the adjustable welding of the hoist roller holder support plate assembly total space |
CN109702691A (en) * | 2019-03-01 | 2019-05-03 | 广西玉柴机器股份有限公司 | A kind of valve spring indenter device |
CN109835610A (en) * | 2019-03-29 | 2019-06-04 | 江苏核电有限公司 | A kind of fixed device of gen-set diesel engine crankshaft transport |
CN110125663A (en) * | 2019-05-08 | 2019-08-16 | 河南瑞创通用机械制造有限公司 | A kind of cropper stepless change wheel spring assembly device and method |
CN114770424A (en) * | 2022-06-21 | 2022-07-22 | 莱州亚通重型装备有限公司 | Diesel engine cylinder cap valve spring collet installation device |
CN114851125A (en) * | 2022-05-18 | 2022-08-05 | 北京中海沃邦能源投资有限公司 | Internal combustion engine valve dismantles frock |
CN115070673A (en) * | 2021-03-11 | 2022-09-20 | 中国航发上海商用航空发动机制造有限责任公司 | Dismounting tool for parts in shaft tube |
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CN105437143A (en) * | 2016-01-06 | 2016-03-30 | 安徽江淮汽车股份有限公司 | Auxiliary mounting tool for valve collet |
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CN201350619Y (en) * | 2009-01-06 | 2009-11-25 | 中国海洋石油总公司 | Device for installing and removing cartridge valve |
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106493551A (en) * | 2016-12-28 | 2017-03-15 | 沪东重机有限公司 | A kind of electrodynamic type valve collet tool for fastening/disengaging |
CN107717843A (en) * | 2017-11-13 | 2018-02-23 | 利欧集团浙江泵业有限公司 | Semi-automatic oil sealing oiling pressing machine |
CN108465969B (en) * | 2018-06-05 | 2024-01-26 | 法兰泰克重工股份有限公司 | Full-space adjustable welding device for assembling support plate of crane drum support |
CN108465969A (en) * | 2018-06-05 | 2018-08-31 | 法兰泰克重工股份有限公司 | A kind of device of the adjustable welding of the hoist roller holder support plate assembly total space |
CN109702691A (en) * | 2019-03-01 | 2019-05-03 | 广西玉柴机器股份有限公司 | A kind of valve spring indenter device |
CN109835610A (en) * | 2019-03-29 | 2019-06-04 | 江苏核电有限公司 | A kind of fixed device of gen-set diesel engine crankshaft transport |
CN110125663A (en) * | 2019-05-08 | 2019-08-16 | 河南瑞创通用机械制造有限公司 | A kind of cropper stepless change wheel spring assembly device and method |
CN115070673A (en) * | 2021-03-11 | 2022-09-20 | 中国航发上海商用航空发动机制造有限责任公司 | Dismounting tool for parts in shaft tube |
CN115070673B (en) * | 2021-03-11 | 2023-10-31 | 中国航发上海商用航空发动机制造有限责任公司 | Disassembling tool for parts in shaft tube |
CN114851125A (en) * | 2022-05-18 | 2022-08-05 | 北京中海沃邦能源投资有限公司 | Internal combustion engine valve dismantles frock |
CN114851125B (en) * | 2022-05-18 | 2024-04-16 | 北京中海沃邦能源投资有限公司 | Frock is dismantled to internal-combustion engine valve |
CN114770424A (en) * | 2022-06-21 | 2022-07-22 | 莱州亚通重型装备有限公司 | Diesel engine cylinder cap valve spring collet installation device |
CN114770424B (en) * | 2022-06-21 | 2022-09-30 | 莱州亚通重型装备有限公司 | Diesel engine cylinder cap valve spring collet installation device |
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