CN108518367A - A kind of piston accumulator - Google Patents
A kind of piston accumulator Download PDFInfo
- Publication number
- CN108518367A CN108518367A CN201810361739.3A CN201810361739A CN108518367A CN 108518367 A CN108518367 A CN 108518367A CN 201810361739 A CN201810361739 A CN 201810361739A CN 108518367 A CN108518367 A CN 108518367A
- Authority
- CN
- China
- Prior art keywords
- piston
- end cap
- side end
- center sleeve
- cylinder body
- 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
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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
The invention discloses a kind of piston accumulators, including cylinder body, oily side end cap, gas side end cap, piston, center sleeve and displacement sensor；The oil side end cap is set to the gas side end cap on the cylinder body, the piston is located at the inside of the cylinder body, the center sleeve be sequentially connected to the center of the oily side end cap, the piston center and the center of the gas side end cap between, institute's displacement sensors are located at the inside of the center sleeve.It on the one hand ensure that the concentricity requirement during the pistons work using the center sleeve, on the other hand institute's displacement sensors can be protected, also allow for that institute's displacement sensors can be replaced.Accumulator of the present invention can retain the structure and function of traditional piston accumulators and realize the monitoring to the piston displacement, and simple and stable structure, service life is long, can meet the field working conditions requirement for needing to monitor the piston displacement.
Description
Technical field
The present invention relates to technical field of hydraulic equipment more particularly to a kind of piston accumulators.
Background technology
Accumulator is a kind of energy savings device in hydropneumatic system.It is in due course the energy in system
It is changed into compression energy or potential energy stores, is changed into the energy such as hydraulic pressure or air pressure when system needs, and by compression energy or potential energy
And release, feed system is mended again.When system instantaneous pressure increases, it can absorb the energy of this part, to ensure
Whole system pressure is normal.
Piston accumulator product does not have the function that piston position measures and shows displacement generally at present, in engineering
Real-time Feedback piston position is unable in, it is certain for that cannot meet to be unable to the working condition of accurate judgement accumulator
The requirement of control.Especially in offshore engineering equipment, accumulator needs to monitor piston position, but existing inspection equipment in real time
Cumbersome, inefficiency can not meet the requirement of field working conditions.
Invention content
In order to overcome the shortcomings of the prior art, the present invention, which provides, a kind of having monitoring piston displacement and to meet piston same
The piston accumulator that heart degree requires.
In order to solve the above technical problem, the present invention provides a kind of piston accumulator, including cylinder body, oily side end cap,
Gas side end cap, piston, center sleeve and displacement sensor；
The cylindrical shape of shape of the cylinder body, the oil side end cap are set on a side opening of the cylinder body, the gas
Side end cap is set on another side opening of the cylinder body, and the piston is located at the inside of the cylinder body, the piston and the oil
The oil-in chamber for accommodating hydraulic oil is formed between side end cap, is formed between the piston and the gas side end cap for accommodating gas
The gas chamber of body, the center sleeve are sequentially connected to the center of the oily side end cap, the center of the piston and the gas side
Between the center of end cap so that the piston have relative to the center sleeve and relative to the cylinder body axial movement from
By spending, institute's displacement sensors are located at the inside of the center sleeve.
Preferably, the center sleeve is to be fixedly connected with the oily side end cap, the center sleeve with it is described
The first sealing ring is equipped between piston and/or between the center sleeve and the gas side end cap.
Preferably, one end of the center sleeve is blind end, and the other end of the center sleeve is open end,
The blind end is connected with the oily side end cap, and the open end is connected with the gas side end cap.
Preferably, institute's displacement sensors are arranged in by the open end in the center sleeve, institute's rheme
Detachable structure is equipped between displacement sensor and the gas side end cap.
Preferably, the detachable structure is to be threadedly coupled.
Preferably, institute's displacement sensors further include permanent-magnetic clamp, and the permanent-magnetic clamp is sheathed on the center sleeve
On, the permanent-magnetic clamp is located at the gas chamber and the permanent-magnetic clamp is connected with the piston.
Preferably, the piston is located at the side of the gas chamber and is equipped with round recessed, and the permanent-magnetic clamp passes through spiral shell
It tethers and is arranged in the round recessed.
Preferably, screwed ring and/or the second sealing ring are equipped between the gas side end cap and the cylinder body；It is described
Screwed ring and/or the second sealing ring are equipped between oily side end cap and the cylinder body；Between the piston and the inner wall of the cylinder body
Equipped with multigroup sealing ring.
Preferably, the piston is located at the side of the gas chamber equipped with first group of sealing ring, the piston position
It is equipped with second group of sealing ring in the other side of the oil-in chamber.
Preferably, it is recessed to be equipped with ring between first group of sealing ring and second group of sealing ring for the piston
Slot.
Piston accumulator provided by the present invention, compared with prior art, advantage is：The present invention's passes through institute
Displacement sensors can realize the basic function of monitoring piston displacement, and the oily side end cap is assemblied in using the center sleeve
Center, the piston center and the center of the gas side end cap between design, on the one hand ensure that the pistons work mistake
On the other hand concentricity requirement in journey can protect institute's displacement sensors, also allowing for can be to institute's displacement sensors
It is replaced, extends the service life of the accumulator, accumulator of the present invention can retain traditional piston accumulators
Structure and function, and can realize that simple and stable structure, service life is long to the monitoring of the piston displacement, can meet
The field working conditions for monitoring the piston displacement are needed to require.
Description of the drawings
In order to illustrate more clearly of technical scheme of the present invention, attached drawing needed in embodiment will be made below
Simply introduce, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, general for this field
For logical technical staff, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is the internal structure schematic diagram of the piston accumulator of the embodiment of the present invention.
Fig. 2 is the side structure schematic view of the piston accumulator of the embodiment of the present invention.
Fig. 3 is the enlarged drawing at A in Fig. 1.
In figure：1. cylinder body；2. oily side end cap；3. gas side end cap；4. piston；5. center sleeve；6. displacement sensor；7. forever
Magnet ring；8. oil inlet；9. air inlet；10. screwed ring；11. the first sealing ring；12. the second sealing ring；13. third sealing ring；
14. the 4th sealing ring；15. the 5th sealing ring；16. the 6th sealing ring；17. ring groove.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
In addition, in the description of the present invention, it should be noted that term " first ", " second " etc. are used for description purposes only,
It is not understood to indicate or imply relative importance.
As shown in Figure 1 to Figure 3, the preferred embodiment of the invention provides a kind of piston type accumulation of energy monitoring piston displacement
Device, including cylinder body 1, oily side end cap 2, gas side end cap 3, piston 4, center sleeve 5 and displacement sensor 6；Outside the cylinder body 1
The cylindrical shape of shape, the oil side end cap 2 are set on a side opening of the cylinder body 1, and the gas side end cap 3 is set to the cylinder body
On 1 another side opening, the piston 4 is located at the inside of the cylinder body 1, is formed between the piston 4 and the oily side end cap 2
Oil-in chamber for accommodating hydraulic oil forms the gas chamber for accommodating gas between the piston 4 and the gas side end cap 3,
The center sleeve 5 be sequentially connected to the center of the oily side end cap 2, the piston 4 center and the gas side end cap 3 in
Between the heart so that the piston 4 has the freedom moved axially relative to the center sleeve 5 and/or relative to the cylinder body 1
Degree, institute's displacement sensors 6 are located at the inside of the center sleeve 5.
Based on the piston accumulator of above-mentioned technical characteristic, institute's displacement sensors 6 can realize the base of monitoring 4 displacement of piston
This function has the shortcomings that yielding, profit because the measuring staff material of general magnetostrictive displacement sensor is aluminium section bar at present
The center at the center of the oily side end cap 2, the center and the gas side end cap 3 of the piston 4 is assemblied in the center sleeve 5
Between design, on the one hand ensure that the concentricity requirement in 4 course of work of the piston, on the other hand the displacement can be passed
Sensor 6 is protected, and is also allowed for that institute's displacement sensors 6 can be replaced, is extended the service life of the accumulator, this hair
The bright accumulator can retain traditional piston accumulators structure and function and realization to 4 displacement of the piston
Monitoring, simple and stable structure, service life is long, can meet need to monitor 4 displacement of the piston field working conditions requirement.
Further, the center sleeve 5 is to be fixedly connected with the oily side end cap 2 so that the one of the center sleeve 5
End is fixed on drives the center sleeve 5 to move with when the piston 4 on the accumulator, being avoided to move, the center sleeve 5
The first sealing ring 11 is equipped between the piston 4 and/or between the center sleeve 5 and the gas side end cap 3, described in guarantee
It also allows for whole assemble while good sealing performance in 4 moving process of piston.
Further, one end of the center sleeve 5 is blind end, and the other end of the center sleeve 5 is open end, institute
It states blind end with the oily side end cap 2 to be connected, it is to be understood that the blind end can be integrally formed, can also be
Equipped with capping, sealed-for-life is formed by suitable technique, the hydraulic oil in the oil pocket is avoided to flow into the center sleeve 5
Interior, the open end is connected with the gas side end cap 3, convenient for interting institute's displacement sensors 6 into the center sleeve 5
It is internal.
Further, institute's displacement sensors 6 are arranged in by the open end in the center sleeve 5, the displacement
It is equipped with detachable structure and sealing ring between sensor 6 and the gas side end cap 3, ensures the sealing in the center sleeve 5
Simultaneously, convenient for being replaced to institute's displacement sensors 6, the detachable structure is preferentially easily achieved using simple in structure performance
Threaded connection, certainly, the detachable structure can be buckle etc. other removablies.
Because institute's displacement sensors 6 are excellent to use magnetostrictive displacement sensor 6, institute's displacement sensors 6 further include forever
Magnet ring 7, the permanent-magnetic clamp 7 are sheathed on the center sleeve 5, and the permanent-magnetic clamp 7 is located at the gas chamber and the permanent-magnetic clamp 7
It is connected with the piston 4, realization measures the displacement of the piston 4, achievees the purpose that monitoring.
Further, the piston 4 is located at the side of the gas chamber and is equipped with round recessed, convenient for the air in the air cavity
The mobile piston 4 of energy, the permanent-magnetic clamp 7 are bolted in the round recessed, protect the permanent-magnetic clamp 7 not by liquid
The influence of pressure oil.
Further, screwed ring 10 and/or the second sealing ring 12 are equipped between the gas side end cap 3 and the cylinder body 1；Institute
It states and is equipped with screwed ring 10 and/or the second sealing ring 12 between oily side end cap 2 and the cylinder body 1；The piston 4 and the cylinder body 1
Inner wall between be equipped with multigroup sealing ring, ensure the oil-in chamber and the leakproofness of the gas chamber, multigroup sealing ring
It can guarantee the leakproofness in 4 moving process of the piston.
In the present embodiment, the oily side end cap 2 is equipped with oil inlet 8, and the gas side end cap 3 is equipped with air inlet 9, convenient for pair
The oil-in chamber oil inlet and convenient for gas chamber's aerating body.
As shown in figure 3, the side that the piston 4 is located at the gas chamber is equipped with first group of sealing ring, the piston 4 is located at
The other side of the oil-in chamber is equipped with second group of sealing ring, and first group of sealing ring includes that third sealing ring the 13, the 4th seals
Circle 14 and the 5th sealing ring 15, second group of sealing ring include that third sealing ring 13, the 4th sealing ring 14 and the 6th are close
Seal 16.
The first sealing ring 11, the second sealing ring 12 and the 4th sealing ring 14 described in the present embodiment are preferentially adopted as O
Type circle, the third sealing ring 13 is preferably guide ring, and the 5th sealing ring 15 and the 6th sealing ring 16 are square ring；
But it is not specifically limited to this by the present invention.
Further, the piston 4 is equipped with ring groove between first group of sealing ring and second group of sealing ring
17, the ring groove 17 can reduce the friction area between the piston 4 and the cylinder body 1, be more conducive to the piston 4 into
Row movement.
In conclusion the displacement sensor 6 described in the embodiment of the present invention is inserted into the center sleeve 5 from the open end
In, the total travel demand that length meets the piston 4 is measured, 5 one side of the center sleeve ensure that the piston 4 is worked
On the other hand concentricity requirement in journey can protect institute's displacement sensors 6, also allowing for can be to institute's displacement sensors
6 are replaced, and extend the service life of the accumulator, and accumulator of the present invention can retain traditional piston accumulators
Structure and function, and can realize that simple and stable structure, service life is long to the monitoring of 4 displacement of the piston, can meet
The field working conditions for monitoring 4 displacement of the piston are needed to require.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of piston accumulator, which is characterized in that including cylinder body, oily side end cap, gas side end cap, piston, center sleeve with
And displacement sensor；
The cylindrical shape of shape of the cylinder body, the oil side end cap are set on a side opening of the cylinder body, the gas side end
It is covered on another side opening of the cylinder body, the piston is located at the inside of the cylinder body, the piston and the oily side
The oil-in chamber for accommodating hydraulic oil is formed between lid, is formed between the piston and the gas side end cap for accommodating gas
Gas chamber, the center sleeve are sequentially connected to the center of the oily side end cap, the center of the piston and the gas side end cap
Center between so that the piston have relative to the center sleeve and relative to the cylinder body axial movement freedom
Degree, institute's displacement sensors are located at the inside of the center sleeve.
2. piston accumulator according to claim 1, which is characterized in that the center sleeve is with the oily side end cap
It is fixedly connected, the is equipped between the center sleeve and the piston and/or between the center sleeve and the gas side end cap
One sealing ring.
3. piston accumulator according to claim 1, which is characterized in that one end of the center sleeve is blind end,
The other end of the center sleeve be open end, the blind end with it is described oil side end cap be connected, the open end with it is described
Gas side end cap is connected.
4. piston accumulator according to claim 3, which is characterized in that institute's displacement sensors pass through the open end
It is arranged in the center sleeve, detachable structure is equipped between institute's displacement sensors and the gas side end cap.
5. piston accumulator according to claim 4, which is characterized in that the detachable structure is to be threadedly coupled.
6. piston accumulator according to any one of claims 1-5, which is characterized in that institute's displacement sensors also wrap
Permanent-magnetic clamp is included, the permanent-magnetic clamp is sheathed on the center sleeve, and the permanent-magnetic clamp is located at the gas chamber and the permanent-magnetic clamp
It is connected with the piston.
7. piston accumulator according to claim 6, which is characterized in that the piston is located at the side of the gas chamber
Equipped with round recessed, the permanent-magnetic clamp is bolted in the round recessed.
8. piston accumulator according to any one of claims 1-5, which is characterized in that the gas side end cap with it is described
Screwed ring and/or the second sealing ring are equipped between cylinder body；Screwed ring and/or the are equipped between the oil side end cap and the cylinder body
Two sealing rings；Multigroup sealing ring is equipped between the piston and the inner wall of the cylinder body.
9. piston accumulator according to claim 8, which is characterized in that the piston is located at the side of the gas chamber
Equipped with first group of sealing ring, the other side that the piston is located at the oil-in chamber is equipped with second group of sealing ring.
10. piston accumulator according to claim 9, which is characterized in that the piston is in first group of sealing ring
Ring groove is equipped between second group of sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810361739.3A CN108518367A (en) | 2018-04-20 | 2018-04-20 | A kind of piston accumulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810361739.3A CN108518367A (en) | 2018-04-20 | 2018-04-20 | A kind of piston accumulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108518367A true CN108518367A (en) | 2018-09-11 |
Family
ID=63428941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810361739.3A Pending CN108518367A (en) | 2018-04-20 | 2018-04-20 | A kind of piston accumulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108518367A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803446A (en) * | 2021-09-23 | 2021-12-17 | 江苏恒立液压股份有限公司 | Hydraulic or pneumatic detection oil cylinder structure |
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|---|---|---|---|---|
| US20100326063A1 (en) * | 2009-06-29 | 2010-12-30 | Leblanc William Kenneth | Methods and apparatus to charge accumulator apparatus |
| CN101956732A (en) * | 2010-11-04 | 2011-01-26 | 何学才 | Gas and oil canister combined non-isolated multiple piston accumulator |
| CN203835821U (en) * | 2014-04-25 | 2014-09-17 | 宁波市巴克蓄能器技术有限公司 | Piston-type energy accumulator |
| CN104295540A (en) * | 2014-05-28 | 2015-01-21 | 国家电网公司 | Energy accumulator with air leakage alarm apparatus and hydraulic operating mechanism |
| CN204357798U (en) * | 2014-11-17 | 2015-05-27 | 布柯玛蓄能器（天津）有限公司 | Be provided with the piston power accumulator of displacement transducer |
| CN204357792U (en) * | 2014-11-17 | 2015-05-27 | 布柯玛蓄能器（天津）有限公司 | Be provided with the piston power accumulator of hydraulic buffering mechanism |
| CN105545834A (en) * | 2016-02-14 | 2016-05-04 | 秦皇岛燕大一华机电工程技术研究院有限公司 | Energy accumulator for online monitoring of piston displacement |
| CN206280312U (en) * | 2016-11-01 | 2017-06-27 | 奉化市朝日液压有限公司 | A kind of piston accumulator of utilization magnetic induction measurement piston displacement |
| DE102016007798A1 (en) * | 2016-06-25 | 2017-12-28 | Hydac Technology Gmbh | Hydropneumatic piston accumulator |
| CN107747571A (en) * | 2017-11-01 | 2018-03-02 | 宁波双马机械工业有限公司 | A kind of cylinder structure |
| CN208236788U (en) * | 2018-04-20 | 2018-12-14 | 广州文冲船厂有限责任公司 | A kind of accumulator monitoring piston displacement |
-
2018
- 2018-04-20 CN CN201810361739.3A patent/CN108518367A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100326063A1 (en) * | 2009-06-29 | 2010-12-30 | Leblanc William Kenneth | Methods and apparatus to charge accumulator apparatus |
| CN101956732A (en) * | 2010-11-04 | 2011-01-26 | 何学才 | Gas and oil canister combined non-isolated multiple piston accumulator |
| CN203835821U (en) * | 2014-04-25 | 2014-09-17 | 宁波市巴克蓄能器技术有限公司 | Piston-type energy accumulator |
| CN104295540A (en) * | 2014-05-28 | 2015-01-21 | 国家电网公司 | Energy accumulator with air leakage alarm apparatus and hydraulic operating mechanism |
| CN204357798U (en) * | 2014-11-17 | 2015-05-27 | 布柯玛蓄能器（天津）有限公司 | Be provided with the piston power accumulator of displacement transducer |
| CN204357792U (en) * | 2014-11-17 | 2015-05-27 | 布柯玛蓄能器（天津）有限公司 | Be provided with the piston power accumulator of hydraulic buffering mechanism |
| CN105545834A (en) * | 2016-02-14 | 2016-05-04 | 秦皇岛燕大一华机电工程技术研究院有限公司 | Energy accumulator for online monitoring of piston displacement |
| DE102016007798A1 (en) * | 2016-06-25 | 2017-12-28 | Hydac Technology Gmbh | Hydropneumatic piston accumulator |
| CN206280312U (en) * | 2016-11-01 | 2017-06-27 | 奉化市朝日液压有限公司 | A kind of piston accumulator of utilization magnetic induction measurement piston displacement |
| CN107747571A (en) * | 2017-11-01 | 2018-03-02 | 宁波双马机械工业有限公司 | A kind of cylinder structure |
| CN208236788U (en) * | 2018-04-20 | 2018-12-14 | 广州文冲船厂有限责任公司 | A kind of accumulator monitoring piston displacement |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803446A (en) * | 2021-09-23 | 2021-12-17 | 江苏恒立液压股份有限公司 | Hydraulic or pneumatic detection oil cylinder structure |
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Application publication date: 20180911 |