CN107806456A - One kind die sinking positional cylinder - Google Patents
One kind die sinking positional cylinder Download PDFInfo
- Publication number
- CN107806456A CN107806456A CN201711276093.0A CN201711276093A CN107806456A CN 107806456 A CN107806456 A CN 107806456A CN 201711276093 A CN201711276093 A CN 201711276093A CN 107806456 A CN107806456 A CN 107806456A
- Authority
- CN
- China
- Prior art keywords
- oil cylinder
- axle
- locating shaft
- adjusting bolt
- die sinking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004512 die casting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/67—Mould opening, closing or clamping devices hydraulic
- B29C45/6778—Stroke adjusting or limiting means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1433—End caps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1438—Cylinder to end cap assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Actuator (AREA)
Abstract
The invention discloses one kind to mold positional cylinder, include oil cylinder, the front end of oil cylinder is provided with protecgulum, B mouths are provided with the protecgulum, the rear end of oil cylinder is provided with bonnet, covered after this and be provided with A mouths, oil cylinder axle is provided with oil cylinder, the front end of the oil cylinder axle is stretched out outside the protecgulum, and the front end of oil cylinder axle is provided with cross car wall, and the rear end of oil cylinder axle is fixed with piston, locating shaft is provided with oil cylinder axle, the rear end of the locating shaft is stretched out outside the bonnet, adjusting bolt is provided between locating shaft and the oil cylinder axle, the rear end of adjusting bolt is provided with projection；Adjusting bolt and the piston bolt, adjusting bolt can rotate with the locating shaft, and it can be axially slidably assembled together along locating shaft with the locating shaft, keyway axially is offered on the front end outer wall of the inwall of described adjusting bolt and the locating shaft, retainingf key is provided between adjusting bolt and locating shaft.It the advantage is that：It is rational in infrastructure, it is high by the stroke of regulating piston, repeatable accuracy.
Description
Technical field
The present invention relates to injection machine to cause technical field, especially a kind of die sinking positional cylinder, and it is noted applied to In A Diecasting Equipment
The hydraulic-driven of the switch mold mechanism of molding machine.
Background technology
Positional cylinder is molded, it is used for the hydraulic-driven of the switch mold mechanism of crank type injection machine, is mainly used at a high speed
Under switching molding operation, there is the operating mode of rigorous split cavity position, as manipulator positions pickup.It is to realize that precise automatic produces
Component part a kind of mode, for the uniformity acted every time, it needs good repeatable accuracy.
Existing cylinder structure, the total kilometres of its piston are invariable, position (the i.e. fortune of piston of the die sinking to setting
Row centre position) controlled mainly by valve, but common valve control accuracy is poor, and especially under speed-sensitive switch mould running status, nothing
Method ensures repeatable accuracy；Present solution is the high-precision proportional direction valve of collocation (the ratio side as used BOSCH-REXROTH board
To valve), using high-precision proportional direction valve, not only cost is high, and has very high requirement in oil circuit design and programme-control.
The content of the invention
The technical problem to be solved by the invention for the present situation of prior art is to provide rational in infrastructure, work can be adjusted
Fill in stroke, a kind of high die sinking positional cylinder of repeatable accuracy.
Technical scheme is used by the present invention solves above-mentioned technical problem：
One kind die sinking positional cylinder, includes oil cylinder, the front end of oil cylinder is provided with protecgulum, and B mouths are provided with the protecgulum, oil cylinder
Rear end is provided with bonnet, covers after this and is provided with A mouths, oil cylinder axle is provided with oil cylinder, the front end of the oil cylinder axle stretch out it is described before
Lid is outer, and the front end of oil cylinder axle is provided with cross car wall, and the rear end of oil cylinder axle is fixed with piston, locating shaft is provided with oil cylinder axle,
The rear end of the locating shaft is stretched out outside the bonnet, and adjusting bolt is provided between locating shaft and the oil cylinder axle, adjusting bolt
Rear end is provided with projection；Adjusting bolt and the piston bolt, adjusting bolt can rotate with the locating shaft, and can be along calmly
Position axle is axially slidably assembled together with the locating shaft, outside the front end of the inwall of described adjusting bolt and the locating shaft
Keyway axially is offered on wall, retainingf key is provided between adjusting bolt and locating shaft.
The technical measures of optimization also include：
The inwall of the front end outer wall of above-mentioned adjusting bolt and the oil cylinder axle is provided with axle retainer ring.
Above-mentioned piston bush is located at the rear end of the oil cylinder axle, and the set screw by being radially arranged and the oil cylinder axle
Rear end mutually fix.
The rear of cross car wall is provided with axle sleeve circle on above-mentioned oil cylinder axle.
Above-mentioned protecgulum is sheathed on the front end of the oil cylinder, and bonnet is sheathed on the rear end of the oil cylinder, and connection is double on protecgulum
One end of head screw, the other end of double-threaded screw run through bonnet, and the other end of double-threaded screw is bolted with locking nut.
Elastic washer is provided between above-mentioned locking nut and the bonnet.
The rear end of above-mentioned locating shaft is provided with handwheel.
Above-mentioned B mouths stagger 90 ° on the circumferential surface with A mouths to be set.
Protecgulum liner is provided with above-mentioned protecgulum.
Bonnet liner is provided with above-mentioned bonnet.
A kind of die sinking positional cylinder of the present invention, its oil cylinder is interior to set oil cylinder axle, and the rear end of oil cylinder axle is fixed with piston, and
Locating shaft is set in oil cylinder axle, and setting and locating shaft bolt bolt adjusting bolt, pass through between locating shaft and oil cylinder axle
The distance between rotational positioning axle regulating piston and adjusting bolt upper protruding block, so as to realize the regulation to piston stroke, structure is closed
Reason, it is easy to adjust；In addition, this die sinking positional cylinder uses machinery positioning, the design of oil circuit can be simplified, moreover it is possible to improve die sinking position
The repeatable accuracy put, its repeatable accuracy is up to positive and negative 0.1mm.
Brief description of the drawings
Fig. 1 is the sectional structure chart of the present invention；
Fig. 2 is the sectional structure chart of another section of the present invention；
Fig. 3 is I portions enlarged drawing in Fig. 2；
Fig. 4 is the structural representation that the present invention is connected with clamp die mechanism；
Fig. 5 is the sectional structure chart after regulating piston stroke of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
It is as shown in Figures 1 to 5 the structural representation of the present invention,
Reference therein is：A mouths, B mouths, oil cylinder 1, protecgulum 11, protecgulum liner 11a, bonnet 12, bonnet liner 12a, oil cylinder
Axle 2, cross car wall 21, piston 22, axle sleeve circle 23, locating shaft 3, handwheel 31, adjusting bolt 4, retainingf key 4a, projection 41, axle are solid
Determine ring 42, set screw 5, double-threaded screw 6, locking nut 61, elastic washer 62, clamp die mechanism 7.
As shown in Figures 1 to 5,
One kind die sinking positional cylinder, includes oil cylinder 1, and the front end of oil cylinder 1 is provided with protecgulum 11, and B mouths are provided with the protecgulum 11,
The rear end of oil cylinder 1 is provided with bonnet 12, and A mouths are provided with the bonnet 12, oil cylinder axle 2 is provided with oil cylinder 1, the oil cylinder axle 2
Front end is stretched out outside the protecgulum 11, and the front end of oil cylinder axle 2 is provided with cross car wall 21, and the rear end of oil cylinder axle 2 is fixed with piston 22,
Locating shaft 3 is provided with oil cylinder axle 2, the rear end of the locating shaft 3 is stretched out outside the bonnet 12, locating shaft 3 and the oil cylinder axle 2 it
Between be provided with adjusting bolt 4, the rear end of adjusting bolt 4 is provided with projection 41；Adjusting bolt 4 and the bolt of piston 22, are adjusted
Whole screw rod 4 can rotate with the locating shaft 3, and can be axially slidably assembled together along locating shaft 3 with the locating shaft 3,
Keyway is axially offered on the inwall of described adjusting bolt 4 and the front end outer wall of the locating shaft 3, adjusting bolt 4 is with determining
Retainingf key 4a is provided between the axle 3 of position.
In embodiment, the inwall of the front end outer wall of adjusting bolt 4 and the oil cylinder axle 2 is provided with axle retainer ring 42.
In embodiment, piston 22 is sheathed on the rear end of the oil cylinder axle 2, and the set screw 5 by being radially arranged and institute
The rear end for stating oil cylinder axle 2 is mutually fixed.
In embodiment, the rear of cross car wall 21 is provided with axle sleeve circle 23 on oil cylinder axle 2.
In embodiment, protecgulum 11 is sheathed on the front end of the oil cylinder 1, and bonnet 12 is sheathed on the rear end of the oil cylinder 1, protecgulum
One end of double-threaded screw 6 is connected on 11, the other end of double-threaded screw 6 runs through bonnet 12, and the other end of double-threaded screw 6 is bolted with lock
Tight nut 61.
In embodiment, elastic washer 62 is provided between locking nut 61 and the bonnet 12.
The other end of double-threaded screw 6 is bolted with 2 locking nuts 61, and coordinates elastic washer 62, to prevent locking nut
61 loosening.
In embodiment, the rear end of locating shaft 3 is provided with handwheel 31.The setting of handwheel 31 facilitates the rotation of locating shaft 3, makes
Regulation is more laborsaving, conveniently.
In embodiment, B mouths stagger 90 ° on the circumferential surface with A mouths to be set.Stagger setting, the design of oil circuit can be facilitated, subtracted
Small difficulty of processing.
In embodiment, protecgulum liner 11a is provided with protecgulum 11.
In embodiment, bonnet liner 12a is provided with bonnet 12.
Operation principle：
This die sinking positional cylinder, oil cylinder axle 2 is provided with its oil cylinder 1, locating shaft 3, locating shaft 3 and oil are provided with oil cylinder axle 2
Adjusting bolt 4 is provided between cylinder shaft 2, the rear end of adjusting bolt 4 is provided with projection 41, the bonnet in projection 41 and bonnet 12
It is the terminal of the stroke of piston 22 when liner 12a offsets；By the rotational positioning axle 3 of handwheel 31, pass through adjusting bolt 4 and positioning
Retainingf key 4a between axle 3 transmits moment of torsion, adjusting bolt 4 is together rotated with locating shaft 3；And adjusting bolt 4 and piston 22
Between threaded, with the rotation of adjusting bolt 4, piston 22 moves axially along adjusting bolt 4, so as to regulating piston 22 with adjust
The distance between the whole upper protruding block 41 of screw rod 4 (as shown in Figure 5), between the two away from bigger, the stroke of piston 22 is shorter, so just realizes
Regulation to the stroke of piston 22.
As shown in Figure 4, the cross car wall 21 of the front end of oil cylinder axle 2 coordinates with clamp die mechanism 7 (molds positional cylinder in Fig. 4
Structure, the position of adjusting bolt 4 it is identical with Fig. 1), during die sinking, B mouth oil-feeds, A mouths are fuel-displaced, and oil pressure promotes piston 22 to A mouths
Direction is moved, and due to threaded between adjusting bolt 4 and piston 22, the motion of piston 22 drives adjusting bolt 4 together simultaneously
It is mobile；Because piston 22, cross car wall 21 and the phase of oil cylinder axle 2 are fixed, the motion of piston 22 will drive oil cylinder axle 2 and cross car
Wall 21 together moves, so as to drive the clamp die mechanism 7 being connected on cross car wall 21 to complete die sinking action.When closing mould, A mouths enter
Oil, B mouths are fuel-displaced, and oil pressure promotes piston 22, oil cylinder axle 2 and cross car wall 21 1 side of projection 41 away from adjusting bolt 4 in the same direction
To motion, mould action is closed so as to drive clamp die mechanism 7 to complete.During switching molding, the adjusting bolt 4 with the bolt of piston 22 is with piston
22 together move, and both screw threads bear larger power, it is therefore desirable to screw thread are inspected periodically, to ensure the reliable of equipment
Operation.
This die sinking positional cylinder between locating shaft 3 and oil cylinder axle 2 by setting adjusting bolt 4, so as to realize piston 22
The regulation of stroke, it is rational in infrastructure, it is easy to adjust；In addition, this die sinking positional cylinder uses machinery positioning, setting for oil circuit can be simplified
Meter, moreover it is possible to improve the repeatable accuracy of die sinking position, its repeatable accuracy is up to positive and negative 0.1mm.
Highly preferred embodiment of the present invention has illustrated, and the various change or remodeling made by those of ordinary skill in the art are not
It can depart from the scope of the present invention.
Claims (10)
1. one kind die sinking positional cylinder, includes oil cylinder (1), the front end of described oil cylinder (1) is provided with protecgulum (11), the protecgulum
(11) B mouths are provided with, the rear end of described oil cylinder (1) is provided with bonnet (12), and A mouths are provided with the bonnet (12), and it is special
Sign is：Oil cylinder axle (2) is provided with described oil cylinder (1), the protecgulum (11) is stretched out outside in the front end of the oil cylinder axle (2), oil cylinder
The front end of axle (2) is provided with cross car wall (21), and the rear end of oil cylinder axle (2) is fixed with piston (22), and described oil cylinder axle (2) is interior
Locating shaft (3) is provided with, the bonnet (12) is stretched out outside in the rear end of the locating shaft (3), described locating shaft (3) and the oil cylinder
Adjusting bolt (4) is provided between axle (2), the rear end of described adjusting bolt (4) is provided with projection (41)；Described adjustment spiral shell
Bar (4) and the piston (22) bolt, described adjusting bolt (4) can rotate with the locating shaft (3), and can be along positioning
Axle (3) is axially slidably assembled together with the locating shaft (3), the inwall and the locating shaft of described adjusting bolt (4)
(3) keyway axially is offered on front end outer wall, retainingf key is provided between described adjusting bolt (4) and locating shaft (3)
(4a)。
2. a kind of die sinking positional cylinder according to claim 1, it is characterized in that：Outside the front end of described adjusting bolt (4)
Wall and the inwall of the oil cylinder axle (2) are provided with axle retainer ring (42).
3. a kind of die sinking positional cylinder according to claim 2, it is characterized in that：Described piston (22) is sheathed on the oil
The rear end of cylinder shaft (2), and the set screw by being radially arranged (5) and the rear end of the oil cylinder axle (2) are mutually fixed.
4. a kind of die sinking positional cylinder according to claim 3, it is characterized in that：In cross car on described oil cylinder axle (2)
The rear of wall (21) is provided with axle sleeve circle (23).
5. a kind of die sinking positional cylinder according to claim 4, it is characterized in that：Described protecgulum (11) is sheathed on the oil
The front end of cylinder (1), described bonnet (12) are sheathed on the rear end of the oil cylinder (1), double end spiral shell are connected on described protecgulum (11)
One end of silk (6), the other end of double-threaded screw (6) run through bonnet (12), and the other end of double-threaded screw (6) is bolted with locking nut
(61)。
6. a kind of die sinking positional cylinder according to claim 5, it is characterized in that：Described locking nut (61) with it is described after
Elastic washer (62) is provided between lid (12).
7. a kind of die sinking positional cylinder according to claim 6, it is characterized in that：The rear end of described locating shaft (3) is set
There is handwheel (31).
8. a kind of die sinking positional cylinder according to claim 7, it is characterized in that：Described B mouths and A mouths are wrong on the circumferential surface
Open 90 ° of settings.
9. a kind of die sinking positional cylinder according to claim 8, it is characterized in that：Protecgulum is provided with described protecgulum (11)
Liner (11a).
10. a kind of die sinking positional cylinder according to claim 9, it is characterized in that：After being provided with described bonnet (12)
Lid liner (12a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711276093.0A CN107806456A (en) | 2017-12-06 | 2017-12-06 | One kind die sinking positional cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711276093.0A CN107806456A (en) | 2017-12-06 | 2017-12-06 | One kind die sinking positional cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107806456A true CN107806456A (en) | 2018-03-16 |
Family
ID=61579501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711276093.0A Pending CN107806456A (en) | 2017-12-06 | 2017-12-06 | One kind die sinking positional cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107806456A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108679038A (en) * | 2018-07-13 | 2018-10-19 | 武汉科技大学 | A kind of novel mechanical self-locking hydraulic actuator |
| CN111412192A (en) * | 2020-03-29 | 2020-07-14 | 邵玉强 | Oil cylinder |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1092686A (en) * | 1965-03-15 | 1967-11-29 | Heinz Teves | Improvements in or relating to hydraulic brakes |
| BE729369A (en) * | 1968-04-18 | 1969-09-05 | ||
| CN202174720U (en) * | 2011-07-14 | 2012-03-28 | 东莞富强鑫塑胶机械制造有限公司 | Mold clamping air cylinder group with adjustable mold opening stroke for injecting and molding machine |
| CN103742480A (en) * | 2014-01-24 | 2014-04-23 | 震雄机械（深圳）有限公司 | Injection molding machine and die locking cylinder thereof |
| CN207673643U (en) * | 2017-12-06 | 2018-07-31 | 富强鑫（宁波）机器制造有限公司 | A kind of die sinking positional cylinder |
-
2017
- 2017-12-06 CN CN201711276093.0A patent/CN107806456A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1092686A (en) * | 1965-03-15 | 1967-11-29 | Heinz Teves | Improvements in or relating to hydraulic brakes |
| BE729369A (en) * | 1968-04-18 | 1969-09-05 | ||
| CN202174720U (en) * | 2011-07-14 | 2012-03-28 | 东莞富强鑫塑胶机械制造有限公司 | Mold clamping air cylinder group with adjustable mold opening stroke for injecting and molding machine |
| CN103742480A (en) * | 2014-01-24 | 2014-04-23 | 震雄机械（深圳）有限公司 | Injection molding machine and die locking cylinder thereof |
| CN207673643U (en) * | 2017-12-06 | 2018-07-31 | 富强鑫（宁波）机器制造有限公司 | A kind of die sinking positional cylinder |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108679038A (en) * | 2018-07-13 | 2018-10-19 | 武汉科技大学 | A kind of novel mechanical self-locking hydraulic actuator |
| CN111412192A (en) * | 2020-03-29 | 2020-07-14 | 邵玉强 | Oil cylinder |
| CN111412192B (en) * | 2020-03-29 | 2022-09-23 | 扬州苏油油成商贸实业有限公司 | Oil cylinder |
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