CN108506271B - Hydraulic cylinder with automatic cooling effect - Google Patents
Hydraulic cylinder with automatic cooling effect Download PDFInfo
- Publication number
- CN108506271B CN108506271B CN201810273917.7A CN201810273917A CN108506271B CN 108506271 B CN108506271 B CN 108506271B CN 201810273917 A CN201810273917 A CN 201810273917A CN 108506271 B CN108506271 B CN 108506271B
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- Prior art keywords
- cylinder body
- cylinder
- piston
- buffer board
- chamber
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Classifications
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- 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
-
- 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
- F15B15/1428—Cylinders
-
- 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
- F15B15/1452—Piston sealings
-
- 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
- F15B15/1485—Special measures for cooling or heating
-
- 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
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/226—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having elastic elements, e.g. springs, rubber pads
-
- 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
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/227—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having an auxiliary cushioning piston within the main piston or the cylinder end face
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention belongs to the executive components in hydraulic system, specifically disclose a kind of hydraulic cylinder with automatic cooling effect, including cylinder body, piston and piston rod are equipped in cylinder body, cylinder body is equipped with upper oil inlet passage and lower oil inlet passage；The outside of cylinder body is equipped with outer cylinder, and heat dissipation channel is equipped between cylinder body and outer cylinder；Cavity is provided on piston and piston rod；Buffer board is slidably connected in cylinder body, oil pocket is provided in buffer board, and the first spring is connected between buffer board and cylinder body；The lower part of cylinder body is equipped with breather cheek valve and one-way exhaust valve；The bottom of cylinder body is equipped with fixed link, and fixed link is equipped with partition, is connected with water inlet pipe and drainpipe on partition；It is provided with chamber in the lower part of fixed link, through-hole is provided in fixed link, the first magnet is equipped in chamber, is equipped with the second magnet in oil pocket；The branch pipe with chamber is connected on lower oil inlet passage.Using the hydraulic cylinder of the technical program, the heat of piston rod, piston and cylinder body can be taken away in the process of work, reduce the temperature of hydraulic cylinder.
Description
Technical field
The invention belongs to the executive components more particularly to a kind of hydraulic cylinder with automatic cooling effect in hydraulic system.
Background technique
Hydraulic cylinder is that hydraulic energy is changed into mechanical energy, the hydraulic of straight reciprocating motion (or pendulum motion) is done and executes member
Part, its structure is simple, reliable operation, when realizing reciprocating motion, can remove deceleration device from it, and do not have drive gap,
Movement is steady, therefore is used widely in the hydraulic system of various machinery.Hydraulic cylinder power output and piston effective area and
The pressure difference on its both sides is directly proportional；Hydraulic cylinder substantially by cylinder barrel and cylinder cap, piston and piston rod, sealing device, buffer unit with
Exhaust apparatus composition.
In some hot environments, and the hydraulic system of frequent operation is needed, if being let out in the pump housing or valve generation, generated
High temperature can pass through hydraulic cylinder, and hydraulic cylinder is in hot environment for a long time, be easy to cause the piston seal failure of hydraulic cylinder, simultaneously
Piston rod is also easily deformed in the high temperature environment, these all substantially reduce the service life of hydraulic cylinder, and is easy to occur
The accidents such as hydraulic fluid leak.By studying the prior art, it is found by the applicant that: at present for be in hot environment hydraulic cylinder,
The device for wrapping up a logical cooling water outside hydraulic cylinder is generally taken, and wraps up piston rod with heat-insulating material, it is hydraulic to reduce
The temperature of cylinder and piston rod.These measures all only act on outside hydraulic cylinder, and cooling rate is slow, and cooling effect is unobvious, no
It is able to satisfy industrial requirement.
Summary of the invention
The purpose of the present invention is to provide a kind of hydraulic cylinders with automatic cooling effect, during hydraulic cylinder works
The heat for taking away piston rod, piston and cylinder body reduces the temperature of hydraulic cylinder.
In order to achieve the above object, base case of the invention are as follows: the hydraulic cylinder with automatic cooling effect, including cylinder
Body, the both ends of cylinder body are respectively cylinder bottom and cylinder head；Piston and piston rod are equipped in cylinder body, one end and the piston of piston rod are fixed,
The other end of piston rod stretches out cylinder head；The cylinder body is divided into rod chamber and rodless cavity by piston, and cylinder body is equipped with to be connected with rod chamber
Logical upper oil inlet passage and the lower oil inlet passage being connected to rodless cavity；The outside of cylinder body is equipped with outer cylinder, sets between cylinder body and outer cylinder
There is heat dissipation channel；Interconnected cavity is provided on piston and piston rod；It is slidably connected below piston in cylinder body
Buffer board is provided with oil pocket in buffer board, the first spring is connected between buffer board and the bottom of cylinder body；The lower part of cylinder body is equipped with single
To intake valve and the one-way exhaust valve that heat dissipation channel can be connected to；The bottom of cylinder body is equipped with the fixed link across buffer board, fixed link
Be equipped with the partition that is slidably connected in piston rod, be connected with water inlet pipe and drainpipe on partition, water inlet pipe be equipped with unidirectionally into
Water valve, drainpipe are equipped with single slope drainage valve；It is provided with chamber in the lower part of fixed link, the through-hole with chamber is provided in fixed link,
Through-hole tilts upward setting；The first magnet for blocking through-hole is equipped in chamber, being equipped in chamber can connect with the first magnet
Second spring, the second magnet to repel each other with the first magnet is equipped in oil pocket；It is connected with and chamber on lower oil inlet passage
Branch pipe.
The working principle of this base case is: when hydraulic cylinder works, external cold water source being connected to water inlet pipe.It is past
When upper oil inlet passage is passed through hydraulic oil, piston and piston rod are along cylinder body slide downward, since partition is fixed, in cavity
Pressure reduces, and one-way water inlet valve is opened, and external cooling water is entered in cavity by water inlet pipe, can reduce piston and piston rod
Temperature.When piston continues traveling downwardly, piston can collide with buffer board, and under the effect of piston, buffer board moves downward, and delay
Punching squeezes the gas in inferior part of the cylinder block, and when the pressure in inferior part of the cylinder block increases, one-way exhaust valve is opened, the gas in inferior part of the cylinder block
Body enters heat dissipation channel by one-way exhaust valve, and the gas of discharge takes away the heat on cylinder side wall, drops the temperature of hydraulic cylinder
It is low.When oil inlet passage is passed through hydraulic oil down, a part of hydraulic oil is entered in cylinder body by lower oil inlet passage, in the hydraulic oil
Under effect, piston and piston rod are along cylinder body upward sliding, while the hydraulic oil can also apply downward active force to buffer board,
Buffer board is set to have the tendency that moving downward.A part of hydraulic oil can be entered in the chamber of fixed link by branch pipe, then be passed through
Through-hole enters in oil pocket, can apply upward active force to buffer board into the hydraulic oil in oil pocket, avoid buffer board because of cylinder body
The effect of interior hydraulic oil and slide downward.
The beneficial effect of this base case is:
1, during hydraulic cylinder works, external cooling water is able to enter in the cavity of piston and piston rod, effectively
The temperature for reducing piston and piston rod, avoids causing piston seal failure and piston rod in hot environment since temperature is excessively high
In deform；Simultaneously during hydraulic cylinder works, buffer board is moved back and forth, and buffer board squeezes the gas in inferior part of the cylinder block, is made
It obtains gas and enters heat dissipation channel, the gas of discharge takes away the heat on cylinder side wall, reduces the temperature of cylinder body.
2, it may collide with the bottom of cylinder body during reciprocating motion of the pistons, be easy to make if impact force is excessive
Piston and cylinder body are destroyed, in the present solution, piston goes downwards to the contact of certain position Shi Huiyu buffer board, buffer board and first
Spring can absorb the portion of energy of piston application, and the movement of damper piston avoids the impact force between piston and cylinder base
It is excessive and cylinder body is caused to damage.
3, when pouring hydraulic oil toward cylinder body, the intracorporal hydraulic oil of cylinder can apply downward active force to buffer board, make to buffer
Plate has the movement tendency of compressed spring, by technical characteristics such as setting branch pipe, second spring, the first magnet and the second magnet, makes
The hydraulic oil for flowing through lower oil inlet passage can be entered in oil pocket by branch pipe, and the hydraulic oil of the part can apply buffer board upward
Active force can offset the downward active force that hydraulic oil applies buffer board in cylinder body, buffer board is avoided to be forced into the bottom of cylinder body
Portion and lead to buffer invalidation.
Further, the lower part of inboard wall of cylinder block is provided with limiting slot, and buffer board is equipped with the protrusion engaged with limiting slot.Limiting slot
Setting limit the movement of buffer board so that buffer board can only avoid buffer board interference piston in fixed position activity
Movement.
Further, there are two limiting slot is set, two limiting slots are evenly distributed in the circumferential direction of cylinder body.Two limiting slots are set
The movement of buffer board can be made more steady.
Further, the upper surface of buffer board is pasted with rubber pad.When piston and buffer board collide, rubber pad can buffer work
Stress between plug and buffer board avoids piston impaired.
Further, the sealing ring being bonded with inboard wall of cylinder block is equipped on piston and buffer board.The setting of sealing ring can
Increase leakproofness, avoids hydraulic fluid leak.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the hydraulic cylinder embodiment that the present invention has automatic cooling effect；
Fig. 2 is the enlarged drawing of part A in Fig. 1.
Specific embodiment
Below by specific embodiment, the present invention is described in further detail:
Appended drawing reference in Figure of description 1 to 2 includes: cylinder body 10, one-way exhaust valve 11, breather cheek valve 12, limit
Slot 13, fixed link 20, partition 21, chamber 22, second spring 23, the first magnet 24, through-hole 25, water inlet pipe 30, one-way water inlet valve
31, drainpipe 40, single slope drainage valve 41, piston 50, piston rod 51, buffer board 60, the first spring 61, oil pocket 62, the second magnet
63, lower oil inlet passage 70, branch pipe 71, outer cylinder 80, heat dissipation channel 81, upper oil inlet passage 90.
As shown in Figure 1, the hydraulic cylinder with automatic cooling effect, including cylinder body 10, the both ends of cylinder body 10 are respectively cylinder bottom
And cylinder head, piston 50 is slidingly and sealingly connected in cylinder body 10, and piston rod 51, the other end of piston rod 51 are fixed on piston 50
Stretch out cylinder head.It is provided with interconnected cavity on piston 50 and piston rod 51, cavity is provided with cooling water；Piston 50 is by cylinder body
10 points are rod chamber and rodless cavity, are provided with oil inlet passage 90 and lower oil inlet passage 70 on cylinder body 10, upper oil inlet passage 90 with have
Rod cavity connection, lower oil inlet passage 70 are connected to rodless cavity.The outside of cylinder body 10 is equipped with outer cylinder 80, sets between cylinder body 10 and outer cylinder 80
There is heat dissipation channel 81.Slidably connect the buffer board 60 positioned at the lower section of piston 50 in cylinder body 10, on piston 50 and buffer board 60
Equipped with the sealing ring of 10 inner wall of cylinder body being bonded, the upper surface of buffer board 60 is pasted with rubber pad.The lower part of 10 inner wall of cylinder body
It opens there are two the limiting slot 13 for limiting 60 motion range of buffer board, two limiting slots 13 are evenly distributed on the circumferential direction of cylinder body 10
On, the protrusion engaged with limiting slot 13 is welded on buffer board 60.Oil pocket 62, buffer board 60 and cylinder body 10 are provided in buffer board 60
Bottom between be connected with the first spring 61, the first spring 61 has upward support force to buffer board 60.The lower part of cylinder body 10 is set
There are breather cheek valve 12 and one-way exhaust valve 11, when the pressure in 10 lower part of cylinder body reduces, breather cheek valve 12 is automatically opened, outside
The gas on boundary can be entered in the lower part of cylinder body 10 by breather cheek valve 12；When pressure in 10 lower part of cylinder body increases, unidirectionally
Exhaust valve 11 automatically opens, and the gas in 10 lower part of cylinder body enters heat dissipation channel 81 by one-way exhaust valve 11, and gas being capable of band
Walk the heat on 10 side wall of cylinder body.The bottom of cylinder body 10 is welded with the fixed link 20 across buffer board 60, fixes in fixed link 20
There is the partition 21 being slidably connected in piston rod 51, water inlet pipe 30 and drainpipe 40 are connected on partition 21, is set on water inlet pipe 30
There is one-way water inlet valve 31, drainpipe 40 is equipped with single slope drainage valve 41.When pressure in cavity increases, single slope drainage valve 41 is beaten
It opens, the water energy in cavity enough passes through drainpipe 40 and is discharged；When pressure in cavity reduces, one-way water inlet valve 31 is opened, and outside connects
The water source connect can be entered in cavity by water inlet pipe 30.As shown in Fig. 2, chamber 22 is provided in the lower part of fixed link 20, it is fixed
The through-hole 25 with the connection of chamber 22 is provided on bar 20, through-hole 25 tilts upward setting.The first magnet 24, chamber are equipped in chamber 22
The second spring 23 connecting with the first magnet 24 is fixed in room 22, under the action of second spring 23, the first magnet 24 is enough will
Through-hole 25 blocks.The second magnet 63 to repel each other with the first magnet 24 is fixed in oil pocket 62, only by self gravity and the first bullet
In the case where 61 active force of spring, the extreme position disposed thereon of buffer board 60, the second magnet 63 and the lucky phase of the first magnet 24 at this time
Right, due to the repulsive force of the first magnet 24 and the second magnet 63, the first magnet 24 overcomes the effect of second spring 23 and makes through-hole
25 open, so that the chamber 22 in fixed link 20 is connected to the oil pocket 62 of buffer board 60, hydraulic oil can be entered by through-hole 25
In oil pocket 62.Branch pipe 71 is connected on lower oil inlet passage 70, branch pipe 71 is connected to chamber 22, and oil inlet passage 70 is filled with hydraulic down
When oily, section hydraulic oil can be entered in chamber 22 by branch pipe 71.
When hydraulic cylinder works, external cold water source is connected to water inlet pipe 30.Up oil inlet passage 90 is passed through hydraulic oil
When, piston 50 and piston rod 51 are along 10 slide downward of cylinder body, and since partition 21 is fixed, the pressure in cavity reduces, single
It is opened to inlet valve 31, external cooling water is entered in cavity by water inlet pipe 30, can reduce piston 50 and piston rod 51
Temperature.When piston 50 continues traveling downwardly, piston 50 can collide with buffer board 60, and under the action of piston 50, buffer board is downward
Movement, buffer board squeeze the gas in 10 lower part of cylinder body, and when the pressure in 10 lower part of cylinder body increases, one-way exhaust valve 11 is opened,
Gas in 10 lower part of cylinder body enters heat dissipation channel 81 by one-way exhaust valve 11, and the gas of discharge is taken away on 10 side wall of cylinder body
Heat reduces the temperature of hydraulic cylinder.When oil inlet passage 70 is passed through hydraulic oil down, a part of hydraulic oil passes through lower oil inlet passage
70 enter in cylinder bodies 10, and under the action of the hydraulic oil, piston 50 and piston rod 51 are along 10 upward sliding of cylinder body, while the liquid
Pressure oil can also apply downward active force to buffer board 60, and buffer board 60 is made to have the tendency that moving downward.A part of hydraulic oil energy
Enough entered by branch pipe 71 in the chamber 22 of fixed link 20, is then entered in oil pocket 62 by through-hole 25, into oil pocket 62
Hydraulic oil can apply upward active force to buffer board 60, avoid buffer board 60 due to the effect of hydraulic oil in cylinder body 10 to downslide
It is dynamic.
What has been described above is only an embodiment of the present invention, and the common sense such as well known specific structure and characteristic are not made herein in scheme
Excessive description.It, without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these also should be considered as protection scope of the present invention, these all will not influence what the present invention was implemented
Effect and patent practicability.The scope of protection required by this application should be based on the content of the claims, in specification
The records such as specific embodiment can be used for explaining the content of claim.
Claims (5)
1. the hydraulic cylinder with automatic cooling effect, including cylinder body, the both ends of cylinder body are respectively cylinder bottom and cylinder head；It is equipped in cylinder body
Piston and piston rod, one end and the piston of piston rod are fixed, and the other end of piston rod stretches out cylinder head；The cylinder body is divided by piston
Rod chamber and rodless cavity, cylinder body are equipped with the upper oil inlet passage being connected to rod chamber and the lower oil inlet passage being connected to rodless cavity；
It is characterized by: the outside of cylinder body is equipped with outer cylinder, heat dissipation channel is equipped between cylinder body and outer cylinder；It is provided on piston and piston rod
Interconnected cavity；Slidably connect the buffer board below piston in cylinder body, be provided with oil pocket in buffer board, buffer board with
The first spring is connected between the bottom of cylinder body；The lower part of cylinder body is equipped with breather cheek valve and the unidirectional row that can be connected to heat dissipation channel
Air valve；The bottom of cylinder body is equipped with the fixed link across buffer board, and fixed link is equipped with the partition being slidably connected in piston rod, every
Water inlet pipe and drainpipe are connected on plate, water inlet pipe is equipped with one-way water inlet valve, and drainpipe is equipped with single slope drainage valve；Fixed link
Lower part in be provided with chamber, the through-hole with chamber is provided in fixed link, through-hole tilts upward setting；It is equipped in chamber for blocking
First magnet of through-hole, chamber is interior to be equipped with the second spring connecting with the first magnet, and being equipped in oil pocket can repel each other with the first magnet
The second magnet；The branch pipe with chamber is connected on lower oil inlet passage.
2. the hydraulic cylinder according to claim 1 with automatic cooling effect, it is characterised in that: open the lower part of inboard wall of cylinder block
There is limiting slot, buffer board is equipped with the protrusion engaged with limiting slot.
3. the hydraulic cylinder according to claim 2 with automatic cooling effect, it is characterised in that: there are two limiting slot is set,
Two limiting slots are evenly distributed in the circumferential direction of cylinder body.
4. the hydraulic cylinder according to claim 1 with automatic cooling effect, it is characterised in that: the upper surface of buffer board is viscous
Post rubber pad.
5. the hydraulic cylinder according to claim 1 with automatic cooling effect, it is characterised in that: on piston and buffer board
Equipped with the sealing ring of inboard wall of cylinder block being bonded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810273917.7A CN108506271B (en) | 2018-03-29 | 2018-03-29 | Hydraulic cylinder with automatic cooling effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810273917.7A CN108506271B (en) | 2018-03-29 | 2018-03-29 | Hydraulic cylinder with automatic cooling effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108506271A CN108506271A (en) | 2018-09-07 |
| CN108506271B true CN108506271B (en) | 2019-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810273917.7A Active CN108506271B (en) | 2018-03-29 | 2018-03-29 | Hydraulic cylinder with automatic cooling effect |
Country Status (1)
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| CN (1) | CN108506271B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109253350B (en) * | 2018-11-08 | 2020-09-15 | 中建二局安装工程有限公司 | Damping mechanism for electromechanical device |
| CN110497183B (en) * | 2019-09-25 | 2021-03-30 | 杭州毅洁轴承制造有限公司 | Bearing press-mounting machine |
| CN112610557B (en) * | 2020-11-25 | 2023-05-09 | 沂南县天力液压机械有限公司 | Tunneling hydraulic cylinder |
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| CN102128186A (en) * | 2011-03-24 | 2011-07-20 | 莱芜钢铁股份有限公司 | Water and air double-cooled hydraulic cylinder |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108506271A (en) | 2018-09-07 |
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Denomination of invention: Hydraulic cylinder with automatic cooling function Effective date of registration: 20220112 Granted publication date: 20191203 Pledgee: Chongqing Rural Commercial Bank Co.,Ltd. Yongchuan sub branch Pledgor: CHONGQING WAYCH HYDRAULIC MACHINERY Co.,Ltd. Registration number: Y2022500000001 |
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