CN206035916U - High level oil tank of hot press and applied high level oil tank's hot press - Google Patents
High level oil tank of hot press and applied high level oil tank's hot press Download PDFInfo
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- CN206035916U CN206035916U CN201620895666.2U CN201620895666U CN206035916U CN 206035916 U CN206035916 U CN 206035916U CN 201620895666 U CN201620895666 U CN 201620895666U CN 206035916 U CN206035916 U CN 206035916U
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- oil
- oil tank
- cylinder
- hot press
- tank body
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Abstract
The utility model belongs to the technical field of wood -based plate production line equipment and specifically relates to a hot press of high level oil tank and applied high level oil tank is related to. High level oil tank includes the oil tank body, the oil tank body is the tube -shape, the maximum breadth who highly is greater than the cross section of oil tank body of oil tank body. The hot press includes frame, hydro -cylinder cylinder, hydro -cylinder plunger and high level oil tank, the hydro -cylinder cylinder is fixed to be set up in the frame, the hydro -cylinder plunger sets up in the hydro -cylinder cylinder to form airtight appearance chamber in the hydro -cylinder cylinder, high level oil tank sets up the one end at the hydro -cylinder cylinder, and through prefill valve and airtight appearance chamber intercommunication. The utility model discloses set up the oil tank into higher tube -shape, establish immediately on the hydro -cylinder, reduced with the area of contact of hot press, avoided the hydraulic oil in the oil tank directly to be heated, reduced oily temperature, high level oil tank can prefabricate processing, and the immediate shipment is used promptly, need not if the trying on clothes of traditional oil tank, disassemble, clean, technology such as installation, reduced manufacturing cost.
Description
Technical field
This utility model is related to artificial board product line apparatus field, more particularly, to a kind of top petrol tank of hot press and should
With the hot press of top petrol tank.
Background technology
The full name of hot press should be heating hydraulic press, be one kind of hydraulic press.Hot press is mainly used to suppress large format
Plate product.
In the short cycle veneering production line of wood-based plate, hot press is nucleus equipment, the stability of hot press operation and operation
The speed of speed directly determines the production efficiency of production line.For making the operation of hot press fast and stable, above hot press usually
One top petrol tank of design, coordinates replenishing valve, carries out rapid oil charging-discharging in oil cylinder for presses action, subtract while regime flow
The discharge capacity of little oil pump, so that reach energy-saving purpose.
Traditional hot press top petrol tank is standing to count into cuboid-type, the lower section of cuboid by oil-filled arm with it is each
Individual replenishing valve and oil cylinder connection, i.e. connected mode of the fuel tank to multi-cylinder, so that meet the quick oil-filled functional requirement of oil cylinder.
Traditional cuboid top petrol tank is suffered from the drawback that：
1st, fuel tank is located above hot press, and heating surface area is big, and the substantial amounts of heat of hot press is conducted to the fuel tank, causes oil temperature
Superelevation and it is difficult to cool down.According to on-the-spot record, hydraulic oil oil temperature is up to more than 65 DEG C, and the best effort scope of hydraulic oil is 40
Between -55 degree of degree.High oil temperature reduces can the viscosity of oil, easily cause leakage, efficiency to decline；Tenacity of lubricating film is reduced,
Acceleration mechanical weares and teares；Produce carbide and sludge；Fluid oxidation accelerates oil to deteriorate；Oil sealing, high-pressure rubber pipe premature aging etc..It is comprehensive
On, the performance of high oil temperature meeting strong influence equipment.
2nd, all there is micro displacement in hot press compression motion in each oil-filled arm, so as to pull fuel tank entirety；
Simultaneously there is the overall vibrations of press and oil cylinder rapid oil charging-discharging to influence factor of both the Repiration of fuel tank.
3rd, cleaning cleaning is difficult to, and welding slag pollution is the first arch-criminal of hydraulic system fault.
4th, when traditional cuboid top petrol tank and hot press coordinate assembling, because of the requirement of positional precision, it is necessary to take with weldering
The technique of oil-filled arm.Technical process is as follows：Trial assembly in factory → with the oil-filled arm of weldering → disassemble → oil-filled arm of pickling, cleaning oil
Installation → the In-Plant Test of case → again；Such technical process is relatively costly.
5th, limited by the design of traditional cuboid top petrol tank shape, user need to be equipped with substantial amounts of hydraulic oil, but to oil cylinder
For about only need to 40%-50% volume capacities, so as to the substantial amounts of consumptive material of cause the user is wasted.
Utility model content
The purpose of this utility model is the top petrol tank and the hot press using top petrol tank for providing hot press, to solve
Technical problem present in prior art.
The top petrol tank of the hot press that this utility model is provided, including oil tank body；
The oil tank body is tubular；
Breadth Maximum of the height of the oil tank body more than the cross section of the oil tank body.
Further, oil ga(u)ge is provided with the side wall of the oil tank body, for observing the hydraulic pressure in the oil tank body
The liquid level of oil.
Further, one end of the oil tank body is provided with replenishing valve.
Further, the other end of the oil tank body is provided with air filter.
Further, pressure cooling system is additionally provided with the oil tank body, for cooling down in the oil tank body
Hydraulic oil.
Further, the pressure cooling system includes oil inlet pipe and flowline；
The oil inlet pipe and the flowline are connected with the oil tank body；
The oil inlet pipe and the flowline be not in same level.
Further, level height of the level height of the oil inlet pipe less than the flowline.
This utility model additionally provides a kind of hot press of application top petrol tank, and which includes frame, cylinder tube, oil cylinder post
Plug and the top petrol tank described in any of the above-described；
The cylinder tube is fixedly installed in the frame；
The Cylinder Plunger is arranged in the cylinder tube, and in the cylinder tube forms closed containing cavity；
The top petrol tank is arranged on one end of the cylinder tube, and is connected with the closed containing cavity by replenishing valve.
Further, the top petrol tank is multiple.
Further, connected by cross over pipe between multiple top petrol tanks.
Further, the distance between the oil inlet pipe of the top petrol tank and described cylinder tube are less than the top petrol tank
The distance between flowline and the cylinder tube.
The top petrol tank of the hot press that this utility model is provided, as fuel tank is set to higher tubular, which erects
On oil cylinder, the contact area with hot press is reduced, and then increased the area of dissipation of hot press, it is to avoid the hydraulic pressure in fuel tank
Oil is directly heated, and reduces oil temperature；Top petrol tank can carry out prefabricated processing, plug and play；Without the need for the trial assembly such as traditional fuel tank, tear open
Solution, cleaning, the process installed, reduce manufacturing cost.
Description of the drawings
In order to be illustrated more clearly that this utility model specific embodiment or technical scheme of the prior art, below will be right
Needed for specific embodiment or description of the prior art, accompanying drawing to be used is briefly described, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
The structural representation of the hot press of the application top petrol tank that Fig. 1 is provided for this utility model；
Side views of the Fig. 2 for Fig. 1.
Reference：
1：Air filter 2：Oil tank body 3：Oil ga(u)ge
4：Flowline 5：Cylinder tube 6：Cylinder Plunger
7：Closed containing cavity 8：Oil inlet pipe 9：Replenishing valve
10：Frame
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is a part of embodiment of this utility model, rather than the embodiment of whole.Based on the embodiment in this utility model, this
The every other embodiment obtained under the premise of creative work is not made by field those of ordinary skill, belongs to practical
Novel protected scope.
As depicted in figs. 1 and 2, this utility model provides a kind of press top petrol tank, including oil tank body 2；
The oil tank body 2 is tubular；
Breadth Maximum of the height of the oil tank body 2 more than the cross section of the oil tank body 2.
In this utility model, oil tank body 2 is set to cylindrical shape, and which is highly more than its diameter, that is to say, that from outward appearance
See, oil tank body 2 is a longer cylinder.
When in use, oil tank body 2 is erected on oil cylinder, the contact area of such oil tank body 2 and hot press
Will become less, and then the heat dissipation channel of hot press is discharged, enable hot press to carry out direct large area radiating,
Avoid hydraulic oil in fuel tank to be directly heated, and then reduce oil temperature, extend the service life of hydraulic oil.
In this utility model, the standard sections making of the material selection of oil tank body 2, weld seam quantity it is few and for shape compared with
Rule, meets automatic welding equipment welding requirement, adapts to mass production, so as to weldquality is effectively ensured.
Top petrol tank is independently mounted on oil cylinder, is not existed because of the micro displacement that hot press pressurization is caused and in causing
Stress, it is to avoid the seepage that weld seam, sealing member cause because of internal stress.
Top petrol tank can overall cleaning treatment, facilitate practical operation, so as to being prevented effectively from hydraulic system that pollution causes therefore
Barrier.
Top petrol tank can carry out prefabricated processing, plug and play；Without the need for as tradition fuel tank carry out trial assembly, disassemble, clean,
The techniques such as installation, reduce manufacturing cost.
Top petrol tank press oil cylinder reality oil mass design, hydraulic oil effective dose account for fuel tank total capacity than up to 90% with
On, it is the 35%-50% of traditional cuboid top petrol tank, really reduces the use cost of user.
It is preferred embodiment to be provided with oil ga(u)ge 3 on the side wall of the oil tank body 2, for observing the fuel tank sheet
The liquid level of the hydraulic oil in body 2.
The oil measurement epi-position that the oil ga(u)ge of indication is mounted on oil storage position (fuel tank etc.) in machinery industry put for
Observation oil level.National Specification has four kinds of oil ga(u)ge patterns：Press-fit circular oil scale, screw-in circular oil scale, long oil leveller
With tubulose oil ga(u)ge.Suitable structural shape and installation site must be selected for ease of observing oil mass.
In the present embodiment, the oil ga(u)ge 3 for using be tubulose oil ga(u)ge, which is be arranged in parallel with oil tank body 2, and two ends with oil
The inside connection of case body 2, the liquid level in oil ga(u)ge 3 follows the liquid level in oil tank body 2 to rise or fall, and then is easy to fuel tank
The liquid level of the hydraulic oil in body 2 is directly observed.
It is pointed out that the oil ga(u)ge 3 for using in the present embodiment is tubulose oil ga(u)ge, but which is not limited solely to tubulose oil
Mark, which can also be other kinds of oil ga(u)ge, that is to say, that as long as which can observe the liquid in oil tank body 2 by oil ga(u)ge 3
The liquid level of force feed.
It is preferred embodiment that one end of the oil tank body 2 is provided with replenishing valve 9.
Replenishing valve 9 is a kind of hydraulic control one-way valve, a direction fluid stopping, another direction free flow, guide's action be by
What the control valve element hydraulic pressure of hydraulic fluid port voltage supply was realized, main valve is directly opened therefrom.
In the present embodiment, one end of oil tank body 2 is provided with replenishing valve 9, can be by the opening and closing of replenishing valve 9
To realize the connection and isolation of oil tank body 2 and the oil cylinder of hot press, and then realize the fuel feeding to hot press.
It is pointed out that one end of oil tank body 2 in the present embodiment is provided that replenishing valve 9, but which is not only
Be confined to replenishing valve 9, which can also be such as flow-limiting valve, check valve etc., that is to say, that if its can control oil tank body 2 with
Connected state between oil cylinder.
It is preferred embodiment that the other end of the oil tank body 2 is provided with air filter 1.
Remove the device of the granulometric impurity in air.Be mainly used in the fields such as pneumatic machinery, diesel machine, effect be for
These plant equipment provide the air of cleaning, in case these plant equipment are sucked with the air of impurity particle at work and increased
Plus abrasion and the probability damaged.The key component of air filter 1 is filter element and casing, and wherein filter element is main filtration
Part, carries the filtration work of gas, and casing is that provide for filter element must external structure to be protected.Which is in hydraulic machinery
Also there is different degrees of application in hydraulic system, the external and internal pressure for being mainly used to adjust hydraulic reservoir is poor.
In the present embodiment, the other end of oil tank body 2 is provided with air filter 1, when replenishing valve 9 is opened,
The content of the hydraulic oil in oil tank body 2 can produce change, now, need air inlet to ensure fuel tank sheet in oil tank body 2
Air suction and discharge that in pressure in body 2, i.e. oil tank body 2, the full and discharge of hydraulic oil can cause.When air is entered
After in oil tank body 2, the impurity which is contained within can be mixed with hydraulic oil, and then may produce chemical reaction, produce hydraulic oil
Raw impurity or other harmful effects, and then the service life of hydraulic oil may be influenced whether.
When in the into or out oil tank body of air 2, filtered by air filter 1, by the impurity in air
After being filtered, clean air is entered in oil tank body 2, and then ensure that the service life of one in oil tank body 2.
It is preferred embodiment to be additionally provided with pressure cooling system on the oil tank body 2, for cooling down the fuel tank
Hydraulic oil in body 2.
Due to hot press operationally, substantial amounts of heat can be produced, and hydraulic oil from oil tank body 2 to oil cylinder repeatedly
In flow process, heat can be also produced, if these heats can not be discharged in time, the service life of hot press may be caused
Detrimental effect.
For solving the above problems, in the present embodiment, pressure cooling system is provided with oil tank body 2, by oil tank body 2
Interior hydraulic oil carries out pressure cooling, declines oil temperature, when hydraulic oil entrance is re-introduced in oil cylinder, at a temperature below oil
Cylinder temperature, can cool down to oil cylinder, and then improve the whole service life of hot press.
It is preferred embodiment that the pressure cooling system includes oil inlet pipe 8 and flowline 4；
The oil inlet pipe 8 and the flowline 4 are connected with the oil tank body 2；
The oil inlet pipe 8 and the flowline 4 be not in same level.
In the present embodiment, pressure cooling system includes the oil inlet pipe 8 being arranged on oil tank body 2 and flowline 4, oil-feed
Pipe 8 and flowline 4 are connected with oil tank body 2, and oil inlet pipe 8 and flowline 4 be not in same level.
When in use, in oil tank body 2 be high temperature oil, low-temperature oil is input in oil inlet pipe 8, enters into low-temperature oil
After in oil tank body 2, mixed with high temperature oil, and then reduced the oil temperature of high temperature oil, discharged from flowline 4 again afterwards, after
And can have low-temperature oil to be endlessly neutralized cooling with high temperature oil in oil tank body 2 so as to force cooling.
Oil inlet pipe 8 and flowline 4 can make currency of the low-temperature oil in oil tank body 2 not in same level
Relative increase, it is ensured that high temperature oil is sufficiently mixed with low-temperature oil.
It is preferred embodiment that the level height of the oil inlet pipe is less than the level height of the flowline.
Deep fat is flowed from bottom to top, its speed for rising can be affected, and then can increase the time of heat exchange, also
High temperature oil can be sufficiently cooled.
This utility model additionally provides a kind of hot press of application top petrol tank, and which includes frame 10, cylinder tube 5, oil
Top petrol tank described in cylinder plug 6 and any of the above-described；
The cylinder tube 5 is fixedly installed in the frame 10；
The Cylinder Plunger 6 is arranged in the cylinder tube 5, and in the cylinder tube 5 forms closed containing cavity 7；
The top petrol tank is arranged on one end of the cylinder tube 5, and is connected with the closed containing cavity 7 by replenishing valve 9
It is logical.
In this utility model, a kind of hot press is additionally provided, that includes frame 10, cylinder tube 5, Cylinder Plunger 6
And the top petrol tank in previous embodiment.
Wherein, frame 10 is the main portion for installing heating platen, cylinder tube 5, Cylinder Plunger 6 and top petrol tank
Part, meanwhile, it is the main bearing member of hot press；Cylinder Plunger 6 is the moving parts in cylinder part, its driving in oil pressure
Under, pressure can be applied to heating platen；Cylinder tube 5 is set in outside Cylinder Plunger 6, and which forms close between Cylinder Plunger 6
Cavity volume 7 is closed, closed containing cavity 7 is connected with the oil tank body 2 of top petrol tank by replenishing valve 9, and is connected with hydraulic oil pump, by liquid
Force feed is pumped into by oil pump and formed in closed containing cavity 7 high pressure, so as to realize the pressurization to Cylinder Plunger 6.
Its course of work is：
When hot press rises, Cylinder Plunger 6 rises, while replenishing valve 9 is opened, the hydraulic oil in cylinder tube 5 is by oil cylinder
Plunger 6 is pushed in the oil tank body 2 of top petrol tank, until the liquid level of hydraulic oil reaches upper limit.
When hot press declines, Cylinder Plunger 6 declines, while replenishing valve 9 is opened, the hydraulic oil in top petrol tank is filled with oil again
In cylinder cylinder barrel 5, the quick topping up of cylinder tube 5 is completed；Until hot press is closed completely, replenishing valve 9 cuts out, and oil pump is to oil cylinder
The hydraulic oil of high pressure is pumped in cylinder 5, until the pressure of setting；After pressurize certain hour, hot press rises, and completes hot press one week
The action of phase.
It is preferred embodiment that the top petrol tank is multiple.
In the present embodiment, top petrol tank be set to it is multiple, multiple top petrol tanks it is parallel and into array arrange.
Such set-up mode, can make top petrol tank relatively large to the hydraulic power that hot press is provided, and due to flat
Go and arrange into array, ensure that top petrol tank is relatively balanced to the power that hot press is provided.
It is pointed out that the mode that array is arranged has many kinds, can such as be rectangular array, or circle
Row, can also be other kinds of array, as long as which can be arranged by array, the hydraulic pressure for making top petrol tank provide to hot press
Power is more balanced.
It is preferred embodiment to be connected by cross over pipe between multiple top petrol tanks.
In the present embodiment, multiple top petrol tanks were connected by communicating pipe, can make all of top petrol tank it
Between hydraulic oil liquid level it is identical, and then top petrol tank is more balanced to the hydraulic power that hot press is provided.
It is pointed out that in the present embodiment, communicating pipe is the flowline 4 on oil tank body 2, i.e., by oil tank body
All of oil tank body 2 is connected together by the flowline 4 on 2.
It is pointed out that as replenishing valve 9 is arranged, the single oil cylinder of certain in this utility model hot press is tieed up
During shield, only hydraulic oil in the top petrol tank of top need to be discharged by replenishing valve 9, without the need for all fluid of release, when reducing customer care
Consume.
It is preferred embodiment that the distance between the oil inlet pipe 8 of the top petrol tank and described cylinder tube 5 are less than institute
State the distance between the flowline 4 of top petrol tank and described cylinder tube 5.
In the present embodiment, on oil tank body 2 oil inlet pipe 8 it is relative with flowline 4 apart from cylinder tube 5 distance more
Closely.
Such setting, when being entered in oil tank body 2 from closed containing cavity 7 due to hydraulic oil, its oil temperature is of a relatively high, this
When, when in oil inlet pipe 8, the relatively low hydraulic oil of temperature is entered in oil tank body 2, hydraulic oil one that can be higher with temperature is ibid
Rise, during to flowline 4, hydraulic oil being sufficiently mixed through a period of time of two kinds of different temperatures, its temperature are forced cooling, it
Discharge from flowline 4 afterwards.
It is pointed out that oil inlet pipe 8 connects away from one end of oil tank body 2 away from one end and the flowline 4 of oil tank body 2
It is logical, i.e., whole pressure cooling system can be made to form a circulation, constantly can be lowered the temperature for whole hot press.
The press top petrol tank that this utility model is provided, as fuel tank is set to higher tubular, which is erected in oil cylinder
On, the contact area with hot press is reduced, and then increased the area of dissipation of hot press, it is to avoid the hydraulic oil in fuel tank is straight
Receive heat, reduce oil temperature；Top petrol tank can carry out prefabricated processing, plug and play；Without the need for the trial assembly such as traditional fuel tank, disassemble,
Cleaning, the process installed, reduce manufacturing cost.
Finally it should be noted that：Various embodiments above is only illustrating the technical solution of the utility model, rather than which is limited
System；Although being described in detail to this utility model with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：Which still can be modified to the technical scheme described in foregoing embodiments, or to which part or whole
Technical characteristic carries out equivalent；And these modifications or replacement, do not make the essence of appropriate technical solution depart from this practicality new
The scope of each embodiment technical scheme of type.
Claims (10)
1. a kind of top petrol tank of hot press, it is characterised in that including oil tank body；
The oil tank body is tubular；
Breadth Maximum of the height of the oil tank body more than the cross section of the oil tank body.
2. the top petrol tank of hot press according to claim 1, it is characterised in that arrange on the side wall of the oil tank body
There is oil ga(u)ge, for observing the liquid level of the hydraulic oil in the oil tank body.
3. the top petrol tank of hot press according to claim 1, it is characterised in that one end of the oil tank body is provided with
Replenishing valve.
4. the top petrol tank of hot press according to claim 1, it is characterised in that the other end of the oil tank body is arranged
There is air filter.
5. the top petrol tank of the hot press according to any one of claim 1-4, it is characterised in that on the oil tank body also
Pressure cooling system is provided with, for cooling down the hydraulic oil in the oil tank body.
6. the top petrol tank of hot press according to claim 5, it is characterised in that the pressure cooling system includes oil-feed
Pipe and flowline；
The oil inlet pipe and the flowline are connected with the oil tank body；
The oil inlet pipe and the flowline be not in same level.
7. a kind of hot press of application top petrol tank, it is characterised in that will including frame, cylinder tube, Cylinder Plunger and right
Seek the top petrol tank described in any one of 1-6；
The cylinder tube is fixedly installed in the frame；
The Cylinder Plunger is arranged in the cylinder tube, and in the cylinder tube forms closed containing cavity；
The top petrol tank is arranged on one end of the cylinder tube, and is connected with the closed containing cavity by replenishing valve.
8. hot press according to claim 7, it is characterised in that the top petrol tank is multiple.
9. hot press according to claim 8, it is characterised in that connected by cross over pipe between multiple top petrol tanks
It is logical.
10. hot press according to claim 7, it is characterised in that the oil inlet pipe of the top petrol tank and the oil cylinder
Flowline and the cylinder tube the distance between of the distance between the cylinder less than the top petrol tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620895666.2U CN206035916U (en) | 2016-08-18 | 2016-08-18 | High level oil tank of hot press and applied high level oil tank's hot press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620895666.2U CN206035916U (en) | 2016-08-18 | 2016-08-18 | High level oil tank of hot press and applied high level oil tank's hot press |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206035916U true CN206035916U (en) | 2017-03-22 |
Family
ID=58306648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620895666.2U Expired - Fee Related CN206035916U (en) | 2016-08-18 | 2016-08-18 | High level oil tank of hot press and applied high level oil tank's hot press |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206035916U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089822A (en) * | 2016-08-18 | 2016-11-09 | 苏州新协力机器制造有限公司 | The top petrol tank of hot press and the hot press of application top petrol tank |
-
2016
- 2016-08-18 CN CN201620895666.2U patent/CN206035916U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089822A (en) * | 2016-08-18 | 2016-11-09 | 苏州新协力机器制造有限公司 | The top petrol tank of hot press and the hot press of application top petrol tank |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170322 Termination date: 20180818 |
|
| IP01 | Partial invalidation of patent right | ||
| IP01 | Partial invalidation of patent right |
Commission number: 5W115054 Conclusion of examination: Claims 1-5 and 7-9 of utility model 201620895666.2, which directly or indirectly refer to the technical solution of claims 1-5, are declared invalid, and the patent right continues to be valid on the basis that claims 6, 10 and 7-9 directly or indirectly refer to the technical solution of claim 6. Decision date of declaring invalidation: 20181229 Decision number of declaring invalidation: 38448 Denomination of utility model: High-level oil tank of hot press and hot press applying high-level oil tank Granted publication date: 20170322 Patentee: Ma Chuan Hui |