CN102454658A - Jib system and telescopic oil cylinder thereof - Google Patents
Jib system and telescopic oil cylinder thereof Download PDFInfo
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- CN102454658A CN102454658A CN201010529278XA CN201010529278A CN102454658A CN 102454658 A CN102454658 A CN 102454658A CN 201010529278X A CN201010529278X A CN 201010529278XA CN 201010529278 A CN201010529278 A CN 201010529278A CN 102454658 A CN102454658 A CN 102454658A
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Abstract
The invention discloses a jib system and a telescopic oil cylinder thereof. The disclosed jib system comprises a cylinder jacket (21), a first piston rod (22), a second piston rod (23) and a core pipe (24) for conveying hydraulic oil into the telescopic oil cylinder. The cylinder jacket (21) comprises a first chamber which is sleeved on the first piston rod (22); the first piston rod (22) comprises a second chamber which is sleeved on the second piston rod (23); the second piston rod (23) comprises a third chamber which is sleeved on the core pipe (24); the first piston rod (22) further comprises a first channel (221) which is communicated with the first chamber and the third chamber; and the second piston rod (23) further comprises a second channel (231) which is communicated with the second chamber and the third chamber. The telescopic oil cylinder is simple in structure, and is easy to process; the assembling difficulty and the production cost of the oil cylinder are lowered effectively; convenience of the engineering design is provided; and the economical applicability of engineering vehicles with the jib system is improved.
Description
Technical field
The present invention relates to the engineering vehicle field, particularly relate to a kind of telescopic oil cylinder that is used for the engineering vehicle arm rest system.In addition, the invention still further relates to a kind of boom system that comprises above-mentioned telescopic oil cylinder.
Background technique
The Telescopic of engineering vehicle arm rests such as telescopic box arm class fire-fighting truck and high-altitude operation vehicle need just can be realized through the impetus of hydraulic jack.
Please refer to Fig. 1, Fig. 1 is the generalized section of a kind of typical jib telescopic oil cylinder in the existing technology.
In the present boom system, mostly used telescopic oil cylinder is two-way cylinder, and its working procedure is described below:
When the oil cylinder needs are overhanging; Through hydraulic fluid port B, hydraulic fluid port C oil-feed; Wherein hydraulic fluid port B oil-feed is led to rodless cavity 13 through the first core pipe 18, and it is overhanging to promote first stage piston 11 and first stage piston bar 14, and hydraulic fluid port C oil-feed is led to rodless cavity 16 through the second core pipe 10; It is overhanging to promote second piston 12 and two piston rods 15, A mouth oil return simultaneously; When oil cylinder need bounce back, through hydraulic fluid port A oil-feed, oil got into rod chamber 19, again through D mouth, oil duct 20, got into rod chamber 17 behind the hydraulic fluid port E, can make two rod chambers be full of high pressure oil simultaneously like this, through hydraulic fluid port B, hydraulic fluid port C oil return simultaneously, realized the oil cylinder retraction.
This kind cylinder structure complicacy has processing technology is required high at 2.Wherein, owing in the first stage piston bar 14 oil duct 20 is arranged, oil duct 20 can use deep hole drill processing; But shortcoming is very high to the requirement of boring straightness accuracy, and general cylinder bar wall thickness is all smaller, therefore is difficult to guarantee straightness accuracy; In addition, the drill bit limited length is difficult to processing long oil cylinder; Oil duct 20 also can use the welding of two-stage sleeve, and certain interval is stayed in the centre, though this kind method can be processed the long oil cylinder, can influence the intensity and the stability of cylinder bar, and middle cavity cleans relatively difficulty simultaneously.And; In order to guarantee that hydraulic oil can be transported to rodless cavity 13; The second core pipe 18 needs to adopt the two-level nested form, and this is just very high to straightness accuracy and coaxality requirement, and the nested centre of two-stage core pipe has also required the Sealing sealing simultaneously; This is just very strict to the processing and the welding requirements of this core pipe, and problems such as core canal curvature leakage of oil very easily appear in the later stage.And high lifting kind vehicle telescopic oil cylinder is generally all very long, reach the stroke about 10 meters, and therefore above-mentioned 2 are difficult to reach usage requirement, even reach reluctantly, also can be difficult to because of complex process quantize to produce.
Simultaneously,,, and,, judge concrete failure cause, have a strong impact on the manufacturing schedule and the mass stability of main computer boxes being difficult in case go wrong because the fault point is many so the later stage rate of fault can be very high because this cylinder structure is too complicated; And, satisfying performance simultaneously in order to guarantee that its complex inner structure can realize, oil cylinder boundary dimension will increase relatively, causes the corresponding structure size to increase; Weight increases, in case but the flexible load of jib is excessive, in order to guarantee hydraulic system pressure maximum can be provided; Hydraulic jack can be exported enough thrust, just must strengthen the size of hydraulic jack, and cylinder sizes increases then can bring jib structure inner space difficult arrangement; Thereby just needing increases the jib size, and then has just increased jib weight, and the telescopic oil cylinder own wt also can increase simultaneously; Flexible load is further strengthened, so will form vicious circle, cause product can't satisfy design standard.
And; Because existing jib telescopic oil cylinder is two-way cylinder, need rod chamber have high pressure oil to get into during retraction and just can bounce back, but because of its rodless cavity all very bigger with the rod chamber area than generally; The overpressure of hydraulic system can't satisfy the use of existing product when just causing the oil cylinder retraction.
Therefore, how to simplify the structure of boom system, make the jib telescopic oil cylinder satisfy the demand while that jib maximizes, its reliability is higher, is the present technical issues that need to address of those skilled in the art.
Summary of the invention
The purpose of this invention is to provide a kind of telescopic oil cylinder that is used for the engineering vehicle arm rest system, it is simple in structure, and better maintainable, reliability is higher.Another object of the present invention provides a kind of boom system that comprises above-mentioned telescopic oil cylinder, and this boom system can adapt to the market demand that engineering machinery maximizes.
For realizing the foregoing invention purpose; The present invention provides a kind of telescopic oil cylinder that is used for boom system; Comprise that cylinder barrel, first piston bar, second piston rod and delivery hydraulic pressure oil get into the core pipe of said telescopic oil cylinder; Said cylinder barrel has first chamber of the said first piston bar of suit, and said first piston bar has second chamber of said second piston rod of suit, and said second piston rod has the 3rd chamber of the said core pipe of suit; Said first piston bar has the first passage that is communicated with said first chamber and said the 3rd chamber, and said second piston rod has the second channel that is communicated with said second chamber and said the 3rd chamber.
Preferably, said core pipe has integral structure.
Preferably, be provided with first guide sleeve between the underpart of the underpart of said cylinder barrel and said first piston bar; The outer wall of this first guide sleeve and said first piston bar closely cooperates, and its underpart is fixedly connected through first flange with the underpart of said cylinder barrel.
Preferably, be provided with first Sealing between said first guide sleeve and the said first piston bar, said first guide sleeve has first seal groove that holds said first Sealing.
Preferably, said first piston bar and first piston have split-type structural, are provided with first support seal between the inwall of said first piston and said cylinder barrel, and said first piston has first mounting groove that holds said first support seal.
Preferably, be provided with second guide sleeve between the underpart of the underpart of said first piston bar and said second piston rod; The outer wall of this second guide sleeve and said second piston rod closely cooperates, and its underpart is positioned at the outer underpart of said first piston bar with said second piston rod and is fixedly connected through second flange.
Preferably, be provided with second Sealing between said second guide sleeve and said second piston rod, said second guide sleeve has second seal groove that holds said second Sealing.
Preferably, said second piston rod and second piston have split-type structural, are provided with second support seal between the inwall of said second piston and said first piston bar, and said second piston has second mounting groove that holds said second support seal.
Preferably, also comprise the limit position part around the upper end portion of said core pipe, the inwall of this limit position part and said second piston rod offsets, and the center is provided with the hydraulic oil channel that extends vertically.
The present invention also provides a kind of boom system, comprises above-mentioned each described telescopic oil cylinder.
The present invention provides a kind of telescopic oil cylinder; The boom system that is used for engineering vehicles such as elevating fire truck, high-altitude operation vehicle; This telescopic oil cylinder comprises that cylinder barrel, first piston bar, second piston rod and delivery hydraulic pressure oil get into the core pipe of said telescopic oil cylinder; Said cylinder barrel has first chamber of the said first piston bar of suit, and said first piston bar has second chamber of said second piston rod of suit, and said second piston rod has the 3rd chamber of the said core pipe of suit; Said first piston bar has the first passage that is communicated with said first chamber and said the 3rd chamber, and said second piston rod has the second channel that is communicated with said second chamber and said the 3rd chamber.Like this, first chamber, second chamber and the 3rd chamber are interconnected, and hydraulic oil is after the core pipe gets into the 3rd chamber; Get into second chamber through second channel, get into first chamber through first passage again, after first chamber, second chamber and the 3rd chamber all are full of; Continuation is injected hydraulic oil through the core pipe in oil cylinder; Make in-oil cylinder pressure increasing, and then it is protruding from first chamber to promote the first piston bar, second piston rod is protruding from second chamber; Realize the flexible of oil cylinder through such principle, reach the flexible purpose of drive jib.
Be not difficult to find out that from above-mentioned working procedure description telescopic oil cylinder provided by the present invention is simple in structure, be easy to processing; Simultaneously, lower because the rod chamber and the rodless cavity of oil cylinder is intercommunication to the sealing requirements between rod chamber and the rodless cavity, effectively reduce the difficulty of processing and the assembling difficulty of oil cylinder; Thereby can effectively reduce the cost of production of telescopic oil cylinder, improve the economic serviceability of engineering vehicle with this boom system.And, because the internal structure of telescopic oil cylinder is simple, telescopic oil cylinder boundary dimension can be reduced greatly; The weight of telescopic oil cylinder also significantly reduces; And can effectively reduce the inner installing space of boom system, and make the jib reduced cross-sectional, alleviate structure weight; Both improved the product performance of engineering vehicle, offered convenience for engineering design again with boom system.
A kind of preferred embodiment in; Be provided with first guide sleeve between the underpart of the underpart of said cylinder barrel and said first piston bar; The outer wall of this first guide sleeve and said first piston bar closely cooperates, and its underpart is fixedly connected through first flange with the underpart of said cylinder barrel.When the first piston bar need upwards stretch out, it is static that the cylinder barrel and first guide sleeve keep, and the first piston bar is along the interior move of first guide sleeve.First guide sleeve can strengthen the cooperate degree of first piston bar and cylinder barrel, improves the tightness and the service behaviour of telescopic oil cylinder.Simultaneously, first guide sleeve is fixedly connected through first flange with the underpart of cylinder barrel, and both fastness are protected; Simultaneously, when damaging appears in the sealed member on first guide sleeve and top thereof, can unclamp first flange; Take out first guide sleeve; Change sealed member, thereby improve the maintainability of telescopic oil cylinder, reduce the user cost of telescopic oil cylinder.
In another preferred embodiment; Said first piston bar and first piston have split-type structural; Be provided with first support seal between the inwall of said first piston and said cylinder barrel, said first upper end portion has first mounting groove that holds said first support seal.First support seal can effectively improve the sealing between the inwall of upper end portion and cylinder barrel of first piston bar, and the efficient when the first piston bar is stretched out is higher.Simultaneously, the split-type structural between first piston bar and the first piston can reduce the difficulty of processing of first piston bar, improves the Economy of telescopic oil cylinder.
Providing on the basis of above-mentioned telescopic oil cylinder, the present invention also provides a kind of boom system that comprises above-mentioned telescopic oil cylinder; Because telescopic oil cylinder has above-mentioned technique effect, the boom system with this telescopic oil cylinder also has the corresponding techniques effect.
Description of drawings
Fig. 1 is the generalized section of a kind of typical jib telescopic oil cylinder in the existing technology;
Fig. 2 is the generalized section of a kind of practical implementation mode of execution of telescopic oil cylinder provided by the present invention;
Fig. 3 is the stereoscopic structural representation of telescopic oil cylinder shown in Figure 2;
Fig. 4 is the section schematic perspective view of telescopic oil cylinder shown in Figure 2;
Fig. 5 is the three-dimensional explosive view of telescopic oil cylinder shown in Figure 2;
Fig. 6 is the three-dimensional explosive view of the section of telescopic oil cylinder shown in Figure 2.
Embodiment
Core of the present invention provides a kind of telescopic oil cylinder that is used for the engineering vehicle arm rest system, and it is simple in structure, and better maintainable, reliability is higher.Another core of the present invention provides a kind of boom system that comprises above-mentioned telescopic oil cylinder, and this boom system can adapt to the market demand that engineering machinery maximizes.
The upper and lower noun of locality that waits that this paper is related is with boom system when in running order, and the residing position of telescopic oil cylinder is that benchmark defines; Simultaneously, the inside and outside noun of locality that waits as herein described is that central shaft with telescopic oil cylinder is the benchmark definition, near the position of central shaft be in, away from the position of central shaft be outside.The noun of locality that should be appreciated that among this paper to be adopted should not limit the protection domain of this patent.
In order to make those skilled in the art person understand the present invention program better, the present invention is done further detailed description below in conjunction with accompanying drawing and embodiment.
Please refer to Fig. 2 to Fig. 6, Fig. 2 is the generalized section of a kind of practical implementation mode of execution of telescopic oil cylinder provided by the present invention; Fig. 3 is the stereoscopic structural representation of telescopic oil cylinder shown in Figure 2; Fig. 4 is the section schematic perspective view of telescopic oil cylinder shown in Figure 2; Fig. 5 is the three-dimensional explosive view of telescopic oil cylinder shown in Figure 2; Fig. 6 is the three-dimensional explosive view of the section of telescopic oil cylinder shown in Figure 2.
Telescopic oil cylinder provided by the present invention; The boom system that is used for engineering vehicles such as elevating fire truck, high-altitude operation vehicle; This telescopic oil cylinder comprises that cylinder barrel 21, first piston bar 22, second piston rod 23 and delivery hydraulic pressure oil get into the core pipe 24 of telescopic oil cylinder; Cylinder barrel 21 has the first chamber I of suit first piston bar 22, and first piston bar 22 has the second chamber II of suit second piston rod 23, and second piston rod 23 has the 3rd chamber III of cover cored pipe 24; First piston bar 22 has first passage 221, the second piston rods 23 that are communicated with the first chamber I and the 3rd chamber III and has the second channel 231 that is communicated with the second chamber II and the 3rd chamber III.Like this, the first chamber I, the second chamber II and the 3rd chamber III are interconnected, and hydraulic oil is after core pipe 24 gets into the 3rd chamber III; Get into the second chamber II through second channel 231, get into the first chamber I through first passage 221 again, after the first chamber I, the second chamber II and the 3rd chamber III are full of; Continuation is injected hydraulic oil through core pipe 24 in oil cylinder; Make in-oil cylinder pressure increasing, and then it is protruding from the first chamber I to promote first piston bar 22, second piston rod 23 is protruding from the second chamber II; Realize the flexible of oil cylinder through such principle, reach the flexible purpose of drive jib.
Be not difficult to find out that from above-mentioned working procedure description with respect to the telescopic oil cylinder of boom system in the existing technology, the core pipe 24 of telescopic oil cylinder provided by the present invention can have integral structure, need not consider the problem of coaxality, to the processing request reduction of core pipe 24; Simultaneously, in the cylinder barrel 21 in the first chamber I, first piston bar 22 in the second chamber II, second piston rod 23 except that the 3rd chamber III, do not have other axially extended hydraulic oil channel, its difficulty of processing also reduces.Therefore, telescopic oil cylinder provided by the present invention is simple in structure, is easy to processing; Simultaneously, lower because the rod chamber and the rodless cavity of telescopic oil cylinder is intercommunication to the sealing requirements between rod chamber and the rodless cavity, effectively reduce the difficulty of processing and the assembling difficulty of oil cylinder; Thereby can effectively reduce the cost of production of telescopic oil cylinder, improve the economic serviceability of engineering vehicle with this boom system.
And, because the internal structure of telescopic oil cylinder is simple, telescopic oil cylinder boundary dimension can be reduced greatly; The weight of telescopic oil cylinder also significantly reduces; And can effectively reduce the inner installing space of boom system, and make the jib reduced cross-sectional, alleviate structure weight; Both improved the product performance of engineering vehicle, offered convenience for engineering design again with boom system.
Therefore, telescopic oil cylinder provided by the present invention, its working procedure is described below:
1, the overhanging process of oil cylinder: hydraulic fluid port A oil-feed; Owing to all communicate between each chamber in the telescopic oil cylinder, therefore being equivalent to telescopic oil cylinder inside has only a chamber, gets into if therefore after hydraulic oil is being full of each chamber, also continue; In order to hold more hydraulic oil; Just require the volume of chamber to increase, and realize that the necessary process that chamber increases is exactly that the first piston bar 22 and second piston rod 23 are overhanging, therefore; When the pressure of the hydraulic oil that gets into when the A mouth was enough to overcome the suffered external force of telescopic oil cylinder, the first piston bar 22 and second piston rod 23 will be overhanging.
2, oil cylinder retraction process: the gravity compression first piston bar 22 of arm rest frame and second piston rod 23 make the hydraulic oil in the telescopic oil cylinder pass through the oil return of A mouth, first piston bar 22 and second piston rod, 23 retractions, the retraction of realization telescopic oil cylinder.
In a kind of concrete mode of execution; Be provided with first guide sleeve 31 between the underpart of the underpart of cylinder barrel 21 and first piston bar 22; This first guide sleeve 31 closely cooperates with the outer wall of first piston bar 22, and its underpart is fixedly connected through first flange with the underpart of cylinder barrel 21.When first piston bar 22 need upwards stretch out, the cylinder barrel 21 and first guide sleeve 31 kept static, and first piston bar 22 is along the interior move of first guide sleeve 31.First guide sleeve 31 can strengthen the cooperate degree of first piston bar 22 and cylinder barrel 21, improves the tightness and the service behaviour of telescopic oil cylinder.
Simultaneously, first guide sleeve 31 is fixedly connected through first flange with the underpart of cylinder barrel 21, and both fastness are protected; Simultaneously, when damaging appears in the sealed member on first guide sleeve 31 and top thereof, can unclamp first flange; Take out first guide sleeve 31; Change sealed member, thereby improve the maintainability of telescopic oil cylinder, reduce the user cost of telescopic oil cylinder.
Particularly, be provided with first Sealing between first above-mentioned guide sleeve 31 and the first piston bar 22, and first guide sleeve 31 has first seal groove 311 that holds first Sealing.Obviously, first seal groove 311 is located on first guide sleeve 31 and the first piston bar 22 on any one all passable, has both improved the maintainability of first piston bar 22, improves the sealability between first piston bar 22 and the cylinder barrel 21 again.
Further, first piston bar 22 can have split-type structural with first piston 25,, be provided with first support seal between the inwall of first piston 25 and cylinder barrel 21, first piston 25 has first mounting groove 251 that holds first support seal.First support seal can effectively improve the sealing between the inwall of upper end portion and cylinder barrel 21 of first piston bar 22, and the efficient when first piston bar 22 is stretched out is higher.Simultaneously, the split-type structural between first piston bar 22 and the first piston 25 can reduce the difficulty of processing and the processing cost of first piston bar 22, improves the Economy of telescopic oil cylinder.
Similar with first guide sleeve 31, be provided with second guide sleeve 32 between the first piston bar 22 and second piston rod 23; The outer wall of second guide sleeve 32 and second piston rod 23 closely cooperates, and its underpart is fixedly connected through second flange with the underpart of second piston rod 23.Simultaneously, be provided with second Sealing between second guide sleeve 32 and second piston rod 23, second guide sleeve 32 has second seal groove 321 that holds the 3rd sealed member.Like this, the tightness between second piston rod 23 and the first piston bar 22 is improved, and the maintainability and the economic serviceability of second piston rod 23 also are improved.
Further, second piston rod 23 and second piston 26 also can have split-type structural, are provided with second support seal between the inwall of second piston 26 and first piston bar 22, and second piston 26 has second mounting groove 261 that holds second support seal.Thereby further improve the sealability between second piston rod 23 and the first piston bar 22, reduce the difficulty of processing of second piston rod 23 simultaneously, reduce the processing cost of second piston rod 23, improve the economic serviceability of telescopic oil cylinder.
In a kind of concrete mode of execution, telescopic oil cylinder provided by the present invention can also comprise the limit position part 27 around the upper end portion of core pipe 24, and the inwall of this limit position part 27 and second piston rod 23 offsets, and the center is provided with the hydraulic oil channel that extends vertically.Because core pipe 24 is longer, the end is provided with the stability that limit position part 27 can effectively improve core pipe 24 above that, avoids the upper end portion of core pipe 24 distortion in use to occur, becomes situation such as curved, improves the reliability of core pipe 24, reduces the rate of fault of telescopic oil cylinder.Obviously, above-mentioned direction of axially stretching out along its first piston bar 22 and second piston rod 23 for telescopic oil cylinder.
In addition, telescopic oil cylinder provided by the present invention can also comprise in the 3rd piston rod and the 3rd piston rod and be provided with the 4th chamber, and the core pipe is located in the 4th chamber, and the 3rd piston rod has the third channel that is communicated with the 4th chamber and first chamber.Like this, it is longer that the structure of boom system can design ground, further satisfies the demand that engineering vehicle maximizes.
Except above-mentioned telescopic oil cylinder, the present invention also provides a kind of boom system that comprises above-mentioned telescopic oil cylinder, and the structure of these other each several parts of boom system please refer to existing technology, and this paper repeats no more.
More than boom system provided by the present invention and telescopic oil cylinder thereof have been carried out detailed introduction.Used concrete example among this paper principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. telescopic oil cylinder that is used for boom system; Comprise that cylinder barrel (21), first piston bar (22), second piston rod (23) and delivery hydraulic pressure oil get into the core pipe (24) of said telescopic oil cylinder; Said cylinder barrel (21) has first chamber of the said first piston bar of suit (22); Said first piston bar (22) has second chamber of said second piston rod of suit (23); Said second piston rod (23) has the 3rd chamber of the said core pipe of suit (24); It is characterized in that said first piston bar (22) has the first passage (221) that is communicated with said first chamber and said the 3rd chamber, said second piston rod (23) has the second channel (231) that is communicated with said second chamber and said the 3rd chamber.
2. the telescopic oil cylinder that is used for boom system according to claim 1 is characterized in that, said core pipe (24) has integral structure.
3. the telescopic oil cylinder that is used for boom system according to claim 2 is characterized in that, is provided with first guide sleeve (31) between the underpart of the underpart of said cylinder barrel (21) and said first piston bar (22); This first guide sleeve (31) closely cooperates with the outer wall of said first piston bar (22), and its underpart is fixedly connected through first flange with the underpart of said cylinder barrel (21).
4. the telescopic oil cylinder that is used for boom system according to claim 3; It is characterized in that; Be provided with first Sealing between said first guide sleeve (31) and the said first piston bar (22), said first guide sleeve (31) has first seal groove (311) that holds said first Sealing.
5. the telescopic oil cylinder that is used for boom system according to claim 4; It is characterized in that; Said first piston bar (22) has split-type structural with first piston (25); Be provided with first support seal between the inwall of said first piston (25) and said cylinder barrel (21), said first piston (25) has first mounting groove (251) that holds said first support seal.
6. according to each described telescopic oil cylinder that is used for boom system of claim 1 to 5, it is characterized in that, be provided with second guide sleeve (32) between the underpart of the underpart of said first piston bar (22) and said second piston rod (23); This second guide sleeve (32) closely cooperates with the outer wall of said second piston rod (23), and its underpart is positioned at the outer underpart of said first piston bar (22) with said second piston rod (23) and is fixedly connected through second flange.
7. the telescopic oil cylinder that is used for boom system according to claim 6; It is characterized in that; Be provided with second Sealing between said second guide sleeve (32) and said second piston rod (23), said second guide sleeve (32) has second seal groove (321) that holds said second Sealing.
8. the telescopic oil cylinder that is used for boom system according to claim 7; It is characterized in that; Said second piston rod (23) has split-type structural with second piston (26); Be provided with second support seal between the inwall of said second piston (26) and said first piston bar (23), said second piston (26) has second mounting groove (261) that holds said second support seal.
9. the telescopic oil cylinder that is used for boom system according to claim 8; It is characterized in that; Also comprise the limit position part (27) around the upper end portion of said core pipe (24), this limit position part (27) offsets with the inwall of said second piston rod (23), and the center is provided with the hydraulic oil channel that extends vertically.
10. a boom system is characterized in that, comprises like each described telescopic oil cylinder of claim 1 to 9.
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|---|---|---|---|
| CN201010529278.XA CN102454658B (en) | 2010-10-25 | 2010-10-25 | Jib system and telescopic oil cylinder thereof |
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| CN201010529278.XA CN102454658B (en) | 2010-10-25 | 2010-10-25 | Jib system and telescopic oil cylinder thereof |
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| CN102454658B CN102454658B (en) | 2014-12-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113797472A (en) * | 2021-06-28 | 2021-12-17 | 福建侨龙应急装备股份有限公司 | Boom structure of fluid conveying device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113797472A (en) * | 2021-06-28 | 2021-12-17 | 福建侨龙应急装备股份有限公司 | Boom structure of fluid conveying device |
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| Publication number | Publication date |
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| CN102454658B (en) | 2014-12-10 |
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Effective date of registration: 20170210 Address after: 221004 Jiangsu Province, Xuzhou City Yunlong District No. 165 Patentee after: Xugong fire safety equipment Co. Ltd. Address before: 221004 Xuzhou, Zhejiang Province, Jiangsu Road No. 165 Patentee before: Xuzhou Heavy Machinery Co., Ltd. |