CN209430683U - A kind of vapor liquid equilibrium counter weight construction - Google Patents
A kind of vapor liquid equilibrium counter weight construction Download PDFInfo
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- CN209430683U CN209430683U CN201920002361.8U CN201920002361U CN209430683U CN 209430683 U CN209430683 U CN 209430683U CN 201920002361 U CN201920002361 U CN 201920002361U CN 209430683 U CN209430683 U CN 209430683U
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Abstract
The utility model provides a kind of vapor liquid equilibrium counter weight construction, including storage cylinder and balance cylinder, storage cylinder is connected by tracheae with balance cylinder, balance cylinder includes cylinder barrel, drive end bearing bracket, piston guide, piston rod and sealing guide sleeve, piston is mounted on the front end of piston rod, piston rod is mounted in cylinder barrel, air inlet is offered on drive end bearing bracket, tracheae is connected with air inlet, axial direction along piston is provided with air passing hole, the inner wall of piston rod and cylinder barrel formed gas channel, air inlet is connected by air passing hole with gas channel is crossed, drive end bearing bracket is mounted on the front end of cylinder barrel, the rear end for being set on cylinder barrel is led in sealing, and the outer surface for sealing guide sleeve and piston rod mutually seals cooperation, piston rod is by stretching out cylinder barrel rear end after sealing guide sleeve.The utility model utilizes the nitrogen pressure principle of nitrogen accumulator, control the weight on the telescopic head of balance cylinder cooperation piston rod, to reach the high speed of service, high-accuracy processing and attenuating CNC numerically-controlled machine tool servo screw Z axis load, extend the purpose of machine service life.
Description
Technical field
The utility model relates to CNC numerical control machine tool technique field, in particular to a kind of vapor liquid equilibrium counter weight construction.
Background technique
CNC numerically-controlled machine tool in the process of running, CNC numerically-controlled machine tool Z axis and other component will affect because of the gravity of itself
The working effect of lathe, therefore, CNC numerically-controlled machine tool need balance weight structure to balance the weight of Z axis and other component because of itself
Power, currently, balancing device mostly uses hydraulic cylinder.
However, the hydraulic cylinder weight used in the prior art is big, the speed of service is slow, and then causes CNC numerically-controlled machine tool big
It is unstable in the fast feed processing of 36M/min, the inaccurate not mirror surface of workpiece cambered surface precision.
Balancing device in the prior art also uses pneumatic cylinder, but pneumatic cylinder in the prior art can generally be arranged one
The case where a air inlet and gas outlet, especially gas outlet often leaks air.
Utility model content
The purpose of the utility model is to provide a kind of vapor liquid equilibrium counter weight constructions, to solve balancing device in the prior art
Speed is slow, unstable the problem of being also easy to gas leakage.
To achieve the goals above, the utility model provides the following technical solutions:
A kind of vapor liquid equilibrium counter weight construction, storage cylinder and balance cylinder including being stored with nitrogen Yu hydraulic oil mixture,
The storage cylinder is connected by tracheae with balance cylinder, the balance cylinder include cylinder barrel, drive end bearing bracket, piston, piston rod and
Guide sleeve is sealed, the piston being mounted on the front end of piston rod, being oriented to when for moving in cylinder barrel to piston rod, the work
Stopper rod is mounted in cylinder barrel, and air inlet is offered on the drive end bearing bracket, and the tracheae is connected with air inlet, along the piston
Axial direction is provided with air passing hole, and the inner wall of the piston rod and cylinder barrel formed gas channel, and the air inlet passed through gas
Hole is connected with gas channel is crossed, and the drive end bearing bracket is mounted on the front end of cylinder barrel, for sealing the front end of cylinder barrel, the sealing guide sleeve
The rear end of cylinder barrel is set, and the outer surface of the sealing guide sleeve and piston rod mutually seals cooperation, for sealing the rear end of cylinder barrel
Guiding role is carried out with to piston rod, the piston rod is by stretching out cylinder barrel rear end after sealing guide sleeve.
Further, the periphery wall of the drive end bearing bracket is opened up there are two the first seal groove, and first seal groove is set respectively
It is equipped with the first sealing ring.
Further, the periphery wall of the piston is opened and is successively provided with the first wear-resistant trough from front to back, and described first is wear-resisting
The first wear-resistant strip is provided in slot.
Further, successively to be formed with the second seal groove, third close for fluting from front to back for the internal perisporium of the sealing guide sleeve
Sealing groove, the 4th seal groove, the 5th seal groove, the 6th seal groove and the first dustproof groove.
Further, it is provided with the second sealing ring in second seal groove, is provided with third in the third seal groove
Sealing ring is provided with the 4th sealing ring in the 4th seal groove, is equipped with the 5th sealing ring in the 5th seal groove, and described the
It is provided with the 6th sealing ring in six seal grooves, is provided with the first dustband in first dustproof groove.
Further, the second wear-resistant trough and oil groove are respectively arranged between the 4th seal groove and the 5th seal groove.
Further, be provided with the second wear-resistant strip in second wear-resistant trough, be provided in the oil groove to piston rod and
The lubricating oil that second wear-resistant strip is lubricated.
The utility model has the following beneficial effects:
The utility model compares with the prior art and has the advantage that
1, the utility model is not provided with venthole, but air passing hole is provided on piston, in this way when storage cylinder passes through
When tracheae is passed through mixed gas to the air inlet of balance cylinder, which just will push piston upwards, to drive
Piston rod moves upwards, and is supported to realize to the main shaft or other component of lathe, mitigates main shaft or other portions of lathe
The load of part；And it is transported downwards when the reset of the piston rod by promotion piston rod when moving downward of machine tool chief axis or other component
Dynamic, to drive, piston moves downward, to the gas crossed in gas channel be pushed away into storage cylinder, since the utility model passes through
Air passing hole is set on piston, so that gas is by backtracking, therefore does not need that other venthole is arranged, to greatly mention
The high sealing performance of balance cylinder, the piston of the utility model and the difference of the prior art, the piston of the prior art are usually
It seals, and the utility model is mainly the work of reflux gas when playing guiding and the piston rod reply to piston rod
With；
2, successively to be formed with the second seal groove, third close for fluting from front to back in the internal perisporium of sealing guide sleeve for the utility model
Sealing groove, the 4th seal groove, the 5th seal groove, the 6th seal groove, and the second sealing ring is provided in the second seal groove, third sealing
It is provided with third sealing ring in slot, the 4th sealing ring is provided in the 4th seal groove, is equipped with the 5th sealing ring in the 5th seal groove,
It is provided with the 6th sealing ring in 6th seal groove, is sealing cylinder respectively since the sealing guide sleeve needs to play two main functions
Internal gas does not leak and is oriented to piston rod, therefore the utility model is in order to guarantee that the sealing guide sleeve can be by cylinder body
Interior gas is fully sealed, and the utility model is provided with 5 sealing rings and is sealed to it, to greatly improve it
Sealing effect, and 2 sealing rings are typically just set in the prior art, it can not use for a long time, be very easy to lead to its gas leakage；
3, in addition the sealing guide sleeve of the utility model is also acted as to piston rod guiding role, is by the of sealing guide sleeve
It is respectively arranged with the second wear-resistant trough and oil groove between four seal grooves and the 5th seal groove, it is resistance to be provided with second in the second wear-resistant trough
Grinding belt is provided with the lubricating oil being lubricated to piston rod and wear-resistant strip in oil groove, and wherein wear-resistant strip is played to piston rod
Guiding role is carried out, can prevent piston rod from directly contacting with sealing guide sleeve inner wall, general sealing guide sleeve damage just needs replacing
Guide sleeve is sealed, and the application, when wear-resistant strip damage, directly replaces wear-resistant strip due to being provided with wear-resistant strip, to save
Maintenance cost.
4, the utility model is provided with oil groove in sealing guide sleeve, and the lubrication being lubricated to piston rod is provided in the oil groove
Oil will take the lubricating oil in oil groove on wear-resistant strip in this way when piston rod is in elevating movement, wear-resisting so as to prevent
Band is dry contact with piston rod, so as to prevent wear-resistant strip from damaging piston rod, plays the role of extending wear-resisting tape lifetime.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment one；
Fig. 2 is the enlarged structure schematic diagram at Fig. 1 K；
Fig. 3 is the frame principle figure of the utility model embodiment one；
Fig. 4 is the structural schematic diagram of the utility model balance cylinder；
Fig. 5 is the structural schematic diagram of the utility model drive end bearing bracket；
Fig. 6 is the structural schematic diagram of the utility model piston；
Fig. 7 is the structural schematic diagram of the utility model sealing guide sleeve；
Structural schematic diagram when Fig. 8 is the utility model sealing guide sleeve and piston rod assembly；
Structural schematic diagram when Fig. 9 to Figure 13 is the upward counterweight of the utility model balance cylinder and resets；
Figure 14 is the structural schematic diagram of the utility model embodiment two；
Figure 15 is the frame principle figure of three the utility model embodiments two.
Specific embodiment
The utility model is further described below in conjunction with attached drawing:
Such as a kind of Fig. 1 to shown in figure 15, vapor liquid equilibrium counter weight construction, including being stored with nitrogen and hydraulic oil mixture
Storage cylinder A and balance cylinder I, the storage cylinder A are connected by tracheae H with balance cylinder I, and the balance cylinder I includes cylinder
Cylinder 1, drive end bearing bracket 2, piston 3, piston rod 4 and sealing guide sleeve 5, the piston 3 are mounted on the front end of piston rod 4, for piston
Bar 4 is oriented to when moving in cylinder barrel 1, and the piston rod 4 is mounted in cylinder barrel 1, offers air inlet on the drive end bearing bracket 2
Mouthful, the tracheae H is connected with air inlet 21, and the axial direction of the piston 3 is provided with air passing hole 31, the piston rod 4
Gas channel 41 was formed with the inner wall of cylinder barrel 1, the air inlet 21 is connected by air passing hole 31 with gas channel 41 is crossed, institute
The front end that drive end bearing bracket 2 is mounted on cylinder barrel 1 is stated, for sealing the front end of cylinder barrel 1, after cylinder barrel 1 is arranged in the sealing guide sleeve 5
End, and the sealing guide sleeve 5 and the outer surface of piston rod 4 mutually seal cooperation, for sealing the rear end of cylinder barrel 1 and to piston rod 4
Guiding role is carried out, the piston rod 4 is by stretching out 1 rear end of cylinder barrel after sealing guide sleeve 5.
Balance cylinder in the application is used primarily in the active force for offsetting the balance of CNC numerically-controlled machine tool Z axis self weight, wherein should
The main points of balance cylinder are as follows: what 1. meaning weighing apparatus both ends were born is equal in weight, and does not tilt.2. two objects of meaning are flushed such as weighing apparatus.3. meaning is kept
Balance；On an equal basis.4. being equal in weight using the thrust of nitrogen pressure adjustment pusher cylinder with receiving.5. the various aspects of opposition are in quantity
It is upper equal.6. two or more power act on an object, each power offsets each other, and makes object at opposite static
State.Also refer to steadily, stablize.
The utility model is not provided with venthole, but air passing hole 31 is provided on piston 3, in this way when storage cylinder A is logical
When crossing tracheae H and being passed through mixed gas to the air inlet 21 of balance cylinder I, which just will push piston 3 and moves upwards, from
And piston rod 4 is driven to move upwards, it realizes and the Z axis or other component of CNC numerically-controlled machine tool is supported, mitigate CNC numerical control
The load of the Z axis or other component of lathe；And the piston rod 4 when resetting by the downward of CNC numerically-controlled machine tool Z axis or other component
Piston rod 4 is pushed to move downward while movement, to move downward with piston 3, so that the gas crossed in gas channel be pushed away
Into storage cylinder A, since the utility model on piston 3 by being arranged air passing hole 31, so that gas is by backtracking, therefore not
Need to be arranged other venthole, to greatly improve the sealing performance of balance cylinder I, the piston of the utility model and existing
There is the difference of technology, the piston 3 of the prior art is usually to seal, and the utility model is mainly played to piston rod
The effect of reflux gas when 4 guiding and piston rod 4 resets.
As shown in Figure 5 and Figure 6, the application only has air inlet 31 to realize the principle for pushing piston rod 4 are as follows: in drive end bearing bracket 2
It is provided with a groove 22, and the front end of the piston 3 is provided with a plush copper 32, which can be plugged into the groove 22, with this
The sealing cooperation of groove 22 can first push the plush copper of the piston 3 in this way when mixed gas enters from the air inlet 21 of drive end bearing bracket 2
32, because the plush copper 32 and the sealing of groove 22 cooperate, after the plush copper 32 of the piston 3 leaves groove 22, mixed gas then can
Piston 3 is continued to press on, due to being provided with venthole 31 on piston 3, mixed gas can be entered in venthole 31, and the work
The piston rod 4 of 3 rear side of plug is equipped with inclined rounded corner 42, which can just stop to come out from venthole 31 mixed
Gas is closed, can be made, the mixed gas come out from venthole 31 first acts on the inclined surface of the rounded corner 42 of the piston rod 4
On, to push piston rod 4 to move, and it is the spacing between 1 inner wall of outer wall and cylinder body by piston rod 4 that this, which crosses gas channel 41,
And formed, which is less than the aperture of venthole, is in this way than passing through ventilation by the flow velocity of the mixed gas of air passing hole 31
The flow velocity in channel 41 wants small, and according to the flow velocity principle of gas, the bigger position pressure of gas flow rate is smaller, the smaller ground of flow velocity
Square pressure is bigger, and such pressure for crossing gas channel 41 is less than the pressure of 3 front side of air passing hole 31 and piston, and mixed gas pushes piston
3 and piston rod 4 moved to the small direction of pressure, to realize the promotion of piston rod 4.
Further, the periphery wall of the drive end bearing bracket 2 is opened up there are two the first seal groove 22, and first seal groove 22 divides
It is not provided with the first sealing ring.
Further, the periphery wall of the piston 3 is opened successively is provided with the first wear-resistant trough 32 from front to back, and described first is resistance to
The first wear-resistant strip is provided in slot grinding 32.
If Fig. 7 is to shown in Fig. 8, successively fluting is formed with the second sealing to the internal perisporium of the sealing guide sleeve 5 from front to back
Slot 51, third seal groove 52, the 4th seal groove 53, the 5th seal groove 54, the 6th seal groove 55 and the first dustproof groove 56.
Further, it is provided with the second sealing ring 51a in second seal groove 51, is set in the third seal groove 52
It is equipped with third sealing ring 52a, the 4th sealing ring 53a is provided in the 4th seal groove 53, is set in the 5th seal groove 54
There is the 5th sealing ring 54a, the 6th sealing ring 55a, setting in first dustproof groove 56 are provided in the 6th seal groove 55
There is the first dustband 56a.
In the internal perisporium of sealing guide sleeve 5, successively fluting is formed with the second seal groove 51, third to the utility model from front to back
Seal groove 52, the 4th seal groove 53, the 5th seal groove 54, the 6th seal groove 55, and it is close to be provided with second in the second seal groove 51
Seal 51a is provided with third sealing ring 52a in third seal groove 52, is provided with the 4th sealing ring 53a in the 4th seal groove 53,
It is equipped with the 5th sealing ring 54a in 5th seal groove 54, the 6th sealing ring 55a is provided in the 6th seal groove 55, due to the sealing
Guide sleeve 5 needs to play two main functions, is that mixed gas does not leak and leads to piston rod 4 in sealing cylinder barrel 1 respectively
To, therefore the utility model is to guarantee that the sealing guide sleeve 5 mixed gas in cylinder barrel 1 can be fully sealed, this reality
It is sealed with novel 5 sealing rings that are provided with, so that its sealing effect is greatly improved, and it is general in the prior art
2 sealing rings are only set, can not be used for a long time, are very easy to lead to its gas leakage.
Further, the second wear-resistant trough 57 and oil are respectively arranged between the 4th seal groove 53 and the 5th seal groove 54
Slot 58.
Further, it is provided with the second wear-resistant strip 57a in second wear-resistant trough 57, is provided in the oil groove 58 to work
The lubricating oil 58a that stopper rod 4 and the second wear-resistant strip 57a are lubricated.
In addition the sealing guide sleeve 5 of the utility model is also acted as to 4 guiding role of piston rod, is by sealing guide sleeve 5
It is respectively arranged with the second wear-resistant trough 57 and oil groove 58 between 4th seal groove 53 and the 5th seal groove 54, in the second wear-resistant trough 57
It is inside provided with the second wear-resistant strip 57a, the profit being lubricated to piston rod 4 and the second wear-resistant strip 57 is provided in oil groove 58
Lubricating oil 58a, wherein the second wear-resisting 57a band play to piston rod 4 carry out guiding role, can prevent piston rod 4 directly with sealing
The contact of 5 inner wall of guide sleeve, general sealing guide sleeve 5 damage just needs replacing sealing guide sleeve 5, and the application is resistance to due to being provided with second
Grinding belt 57a directly replaces the second wear-resisting 57a band, to save maintenance cost when the second wear-resistant strip 57a damage.
The utility model is provided with oil groove 58 in sealing guide sleeve 5, is provided in the oil groove 58 and to be lubricated to piston rod 4
Lubricating oil 58a will take the lubricating oil 58a in oil groove 58 on wear-resistant strip in this way when piston rod 4 is in elevating movement, from
And can prevent the second wear-resistant strip 57a and piston rod 4 is dry contact, so as to prevent the second wear-resistant strip 57a from damaging piston
Bar 4 plays the role of extending wear-resisting tape lifetime.
As shown in Figure 2, storage cylinder A is high-pressure cylinder for storing hydraulic oil and nitrogen, and is provided for balance cylinder I
Nitrogen and hydraulic oil mixture and pressure, it is exactly when storage cylinder A memory that wherein the volume ratio of the nitrogen and hydraulic oil, which is 100:2,
When containing 100 liters of nitrogen, carry out being mixed into mixed gas with regard to the hydraulic oil for being added 2 liters, it can using hydraulic oil is added in nitrogen
So that when piston 3 and piston rod 4 move in cylinder body 1, due between the inner wall and lubricating oil of cylinder body 1 friction and lubricating oil
Fluid molecule between interior friction just form damping force so that mixed gas push piston 3 and piston rod 4 when
Time is easier.
The thrust for the pressure size of nitrogen pressure being adjusted cylinder carrys out the weight of complex equilibrium.
Nitrogen wherein can also be stored in the storage cylinder: copper nanoparticle: the volume ratio of the hydraulic oil of 32# is 99:0.5:
0.5, balance cylinder operation can be allowed more stable more wear resistant using this mixed gas.
Main valve B: this valve control mixed gas flows to the switch of balance cylinder I from storage cylinder A, and connects pressure gauge D, pressure
Switch C, needle-valve E.
Pressure switch C:, can output signal prompting inspection when being lower than " setting pressure " when " operating pressure in storage cylinder A ".
Pressure gauge D: the operating pressure in storage cylinder A can be clearly showed that.
Needle-valve E: for air inlet, compression relief cock.Switch to close clockwise, it at this time can not air inlet and pressure release；Switch to out counterclockwise,
It can tonifying Qi and pressure release.
Row, aerating mouth F: the connector of air inlet and pressure release.
Ball valve G: the switch of mixed gas counterclockwise switchs to out, and storage cylinder A and balance cylinder I, oil can intercommunication；It is suitable
Clockwise switchs to close, and storage cylinder A and balance cylinder I oil are unable to intercommunication.
Tracheae is high-pressure oil pipe H: one end connects ball valve G, and the other end connects balance cylinder I, acts on as storage cylinder A and flat
Mixed gas transmission is used in the cylinder I that weighs.
Balance cylinder I: this special piston rod outer surface and inboard wall of cylinder block it is all electroplated and mirror finish processing, do not have leakage
The situation of oil generates.
The utility model utilizes the principle of nitrogen accumulator, the weight on the telescopic head of control balance cylinder cooperation piston rod
Amount extends the purpose of machine service life to reach the high speed of service, high-accuracy processing and attenuating servo load.
The present embodiment one
If Fig. 1 is to shown in Fig. 3, it is connected using a storage cylinder A with a balance cylinder I, realizes counterweight.
Embodiment two
If Figure 14 is to shown in figure 15, it is connected using a storage cylinder A with two balance cylinder I, realizes counterweight.
The connection of the utility model storage cylinder A and balance cylinder I is not merely one or 2, can also be according to counterweight
It needs and is arranged multiple, the specification of storage cylinder A and balance cylinder I is also that can be arranged according to the needs of counterweight.
The above is not limit the technical scope of the present invention, all according to the utility model technical spirit
To any modification, equivalent variations and modification made by above embodiment, the model of the technical solution of the utility model is still fallen within
In enclosing.
Claims (7)
1. a kind of vapor liquid equilibrium counter weight construction, it is characterised in that: including be stored with nitrogen and hydraulic oil mixture storage cylinder and
Balance cylinder, the storage cylinder are connected by tracheae with balance cylinder, the balance cylinder include cylinder barrel, drive end bearing bracket, piston,
Piston rod and sealing guide sleeve, the piston being mounted on the front end of piston rod, leading when for moving in cylinder barrel to piston rod
To the piston rod is mounted in cylinder barrel, and air inlet is offered on the drive end bearing bracket, and the tracheae is connected with air inlet, edge
The axial direction of the piston is provided with air passing hole, and the inner wall of the piston rod and cylinder barrel formed gas channel, the air inlet
Mouth is connected by air passing hole with gas channel is crossed, and the drive end bearing bracket is mounted on the front end of cylinder barrel, for sealing the front end of cylinder barrel, institute
It states sealing and leads the rear end for being set on cylinder barrel, and the outer surface of the sealing guide sleeve and piston rod mutually seals cooperation, for sealing
The rear end of cylinder barrel and to piston rod carry out guiding role, the piston rod by sealing guide sleeve after stretch out cylinder barrel rear end.
2. a kind of vapor liquid equilibrium counter weight construction according to claim 1, it is characterised in that: the periphery wall of the drive end bearing bracket is opened
If there are two the first seal groove, first seal groove is respectively arranged with the first sealing ring.
3. a kind of vapor liquid equilibrium counter weight construction according to claim 1, it is characterised in that: the periphery wall of the piston open according to
It is secondary to be provided with the first wear-resistant trough from front to back, the first wear-resistant strip is provided in first wear-resistant trough.
4. a kind of vapor liquid equilibrium counter weight construction according to claim 1, it is characterised in that: the internal perisporium of the sealing guide sleeve
Successively fluting is formed with the second seal groove, third seal groove, the 4th seal groove, the 5th seal groove, the 6th seal groove from front to back
With the first dustproof groove.
5. a kind of vapor liquid equilibrium counter weight construction according to claim 4, it is characterised in that: setting in second seal groove
There is the second sealing ring, third sealing ring is provided in the third seal groove, the 4th sealing is provided in the 4th seal groove
Circle, the 5th seal groove is interior to be equipped with the 5th sealing ring, the 6th sealing ring is provided in the 6th seal groove, described first is anti-
The first dustband is provided in dirt slot.
6. a kind of vapor liquid equilibrium counter weight construction according to claim 4, it is characterised in that: the 4th seal groove and the 5th
The second wear-resistant trough and oil groove are respectively arranged between seal groove.
7. a kind of vapor liquid equilibrium counter weight construction according to claim 6, it is characterised in that: setting in second wear-resistant trough
There is the second wear-resistant strip, the lubricating oil being lubricated to piston rod and the second wear-resistant strip is provided in the oil groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920002361.8U CN209430683U (en) | 2019-01-02 | 2019-01-02 | A kind of vapor liquid equilibrium counter weight construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920002361.8U CN209430683U (en) | 2019-01-02 | 2019-01-02 | A kind of vapor liquid equilibrium counter weight construction |
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| Publication Number | Publication Date |
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| CN209430683U true CN209430683U (en) | 2019-09-24 |
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ID=67975187
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920002361.8U Active CN209430683U (en) | 2019-01-02 | 2019-01-02 | A kind of vapor liquid equilibrium counter weight construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412956A (en) * | 2022-01-14 | 2022-04-29 | 湖南九五精机有限责任公司 | Large-scale headstock nitrogen gas-hydraulic pressure balanced system of elimination pressure fluctuation |
-
2019
- 2019-01-02 CN CN201920002361.8U patent/CN209430683U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412956A (en) * | 2022-01-14 | 2022-04-29 | 湖南九五精机有限责任公司 | Large-scale headstock nitrogen gas-hydraulic pressure balanced system of elimination pressure fluctuation |
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