阅读说明：本技术 一种汽车起重机双级伸缩臂油缸 (A kind of autocrane two-stage stretching arm oil cylinder ) 是由 杨邦祝 邱智 代联书 罗均 滕建全 于 2019-08-23 设计创作，主要内容包括：本发明涉及汽车起重机领域,具体涉及一种汽车起重机双级伸缩臂油缸,包括二级缸筒、一级缸筒、一级活塞杆、一级伸缩臂油缸液压锁、二级伸缩臂油缸液压锁、一级缸筒内芯管和二级缸进油通道；所述一级活塞杆中设有一级无杆腔进油通道和有杆腔进油通道,所述一级无杆腔进油通道与一级无杆腔连通,所述有杆腔进油通道与一级有杆腔连通；所述一级缸筒内芯管一端置于有杆腔进油通道内,另一端先后贯穿一级活塞杆、一级无杆腔和一级缸筒后与二级缸筒的二级有杆腔连通；所述二级缸进油通道通过二级伸缩臂油缸液压锁与二级无杆腔连通。这种油缸可以降低油缸生产制造难度,降低成本,减轻油缸和相关零部件重量和机构布置难度,具有经济适用的优点。(The present invention relates to autocrane fields, more particularly to a kind of autocrane two-stage stretching arm oil cylinder, including second level cylinder barrel, level-one cylinder barrel, first stage piston bar, level-one telescopic boom cylinder hydraulic lock, second level telescopic boom cylinder hydraulic lock, level-one cylinder barrel inner core tube and secondary cylinder oil inlet passage；Level-one rodless cavity oil inlet passage and rod chamber oil inlet passage are equipped in the first stage piston bar, the level-one rodless cavity oil inlet passage is connected to level-one rodless cavity, and the rod chamber oil inlet passage is connected to level-one rod chamber；Described level-one cylinder barrel inner core tube one end is placed in rod chamber oil inlet passage, and the other end is connected to after successively running through first stage piston bar, level-one rodless cavity and level-one cylinder barrel with the second level rod chamber of second level cylinder barrel；The secondary cylinder oil inlet passage is connected to by second level telescopic boom cylinder hydraulic lock with second level rodless cavity.This oil cylinder can reduce oil cylinder and manufacture difficulty, reduce cost, mitigate oil cylinder and related components weight and arrangement of mechanism difficulty, have the advantages that economic and practical.)

1. a kind of autocrane two-stage stretching arm oil cylinder, including second level cylinder barrel (2), the level-one cylinder barrel being connected in second level cylinder barrel (1), the first stage piston bar (3) being connected in level-one cylinder barrel, and the level-one telescopic boom cylinder liquid of first stage piston bar tail portion is set Pressure lock (4)；It is logical that the level-one rodless cavity oil inlet being connected with level-one telescopic boom cylinder hydraulic lock is equipped in the first stage piston bar (3) Road (31) and rod chamber oil inlet passage (32), the level-one rodless cavity oil inlet passage (31) also with the level-one of level-one cylinder barrel (1) without Rod cavity (12) connection, the rod chamber oil inlet passage (32) are also connected to the level-one rod chamber (11) of level-one cylinder barrel；Its feature exists In further including second level telescopic boom cylinder hydraulic lock (5), level-one cylinder barrel inner core tube (6) and secondary cylinder oil inlet passage (7)；Described one Grade cylinder barrel inner core tube (6) one end is placed in rod chamber oil inlet passage (32), and the other end successively runs through first stage piston bar (3), level-one Rodless cavity (12) and level-one cylinder barrel (1) are connected to the second level rod chamber (21) of second level cylinder barrel (2) afterwards；The secondary cylinder oil inlet passage (7) it is connected to by second level telescopic boom cylinder hydraulic lock (5) with the second level rodless cavity (22) of second level cylinder barrel.

2. a kind of autocrane two-stage stretching arm oil cylinder according to claim 1, which is characterized in that the second level is flexible Arm oil cylinder hydraulic lock (5) is fixed on second level cylinder barrel (2) outside.

3. a kind of autocrane two-stage stretching arm oil cylinder according to claim 1, which is characterized in that the second level is without bar It is provided with second level rodless cavity oil inlet (23) on corresponding second level cylinder barrel (2) wall of chamber (22), second level rodless cavity oil inlet passes through hard tube It is connect with second level telescopic boom cylinder hydraulic lock (5).

4. a kind of autocrane two-stage stretching arm oil cylinder according to claim 1, which is characterized in that the second level is without bar Chamber oil inlet (23) is located remotely from second level cylinder barrel (2) wall of first stage piston bar (3).

5. a kind of autocrane two-stage stretching arm oil cylinder according to claim 1, which is characterized in that the second level has bar Oilhole (24) are offered on corresponding second level cylinder barrel (2) wall of chamber (21), for the rod chamber oil circuit connection with adjacent oil cylinder.

6. a kind of autocrane two-stage stretching arm oil cylinder according to claim 1, which is characterized in that the rod chamber into Oily channel (32) tail end is connected with first stage piston bar (3) head, front end closing；The rod chamber oil inlet passage (32) closes end side The first stage piston bar (3) in face is equipped with the wing passage (33) of connection rod chamber oil inlet passage and level-one rod chamber (11).

7. a kind of autocrane two-stage stretching arm oil cylinder described in any one according to claim 1~6, which is characterized in that The level-one cylinder barrel inner core tube (6) includes straight pipe and bending segment, and the endpiece of the straight pipe is located at rod chamber oil inlet passage (32) in, and the leading portion of straight pipe enters level-one rodless cavity (12) behind rod chamber oil inlet passage (32) closed end；It is described curved Trisection is in U-shape and is located in the front end face of level-one cylinder barrel, and one end is connected to second level rod chamber (21), and the other end and level-one are without bar Straight pipe leading portion connection in chamber (12).

8. a kind of autocrane two-stage stretching arm oil cylinder according to claim 7, which is characterized in that the level-one is flexible Arm oil cylinder hydraulic locks (4) and second level telescopic boom cylinder hydraulic lock (5) is balanced valve.

Technical field

The present invention relates to autocranes, and in particular to a kind of autocrane two-stage stretching arm oil cylinder.

Background technique

Currently, the bottleneck of five section telescopic arm cranes can only be produced to break through two oil cylinders of conventional hoist+rope structure, External some Crane Manufacturing Corp. develop two-stage stretching arm oil cylinder in more early period, by two-stage stretching arm oil cylinder and it is single, Two-stage stretching arm oil cylinder+rope various combination, develops novel four section, five sections and six joint arm autocranes.

The structure type of external two-stage stretching arm oil cylinder at this stage is substantially as follows: two-stage stretching arm oil cylinder hydraulic being locked and is arranged In first stage piston bar tail portion, first-stage cylinder rodless cavity oil circuit enters from first stage piston bar, and secondary cylinder rodless cavity oil circuit is from first stage piston Bar enters into and through the entrance of level-one cylinder barrel inner core tube, and cylinder rod chamber oil circuit, which enters first-stage cylinder from first stage piston bar tail portion, bar Chamber, and secondary cylinder rod chamber is entered by the dual-layer welding pipe gap of level-one cylinder barrel, and its hydraulic lock is fixed on first stage piston bar Tail portion.This kind of oil cylinder seems simply, and oil circuit trend is succinct, however, difficulty of processing is big since level-one cylinder barrel had oily gap, Required precision is high, and manufacturing cost is high；Also, due to needing to be arranged oily gap, the level-one cylinder barrel of this structure is relatively large in diameter, into And secondary cylinder cylinder size is caused to increase, whole oil cylinder heavier mass, influencing crane hangs load performance, and pole is not suitable for medium and small tonnage Product uses.

Also have for the improvement of the structure at present, for example, by external hydraulic fluid port on level-one cylinder barrel and second level cylinder barrel and External tracking hose mechanism enters secondary cylinder rod chamber, however, this mode need to increase tracking hose between two, three joint arms, makes Crane arm section increases, and crane arm quality increases, and the same crane that influences hangs load performance.

Summary of the invention

The purpose of the invention is to provide a kind of autocrane two-stage stretching arm oil cylinder.This oil cylinder can reduce oil Cylinder manufactures difficulty, reduces cost, mitigates oil cylinder and related components weight and arrangement of mechanism difficulty, has economic and practical Advantage.

To achieve the above object, The technical solution adopted by the invention is as follows:

A kind of autocrane two-stage stretching arm oil cylinder, including second level cylinder barrel, the level-one cylinder barrel being connected in second level cylinder barrel, The first stage piston bar being connected in level-one cylinder barrel, and the level-one telescopic boom cylinder hydraulic lock of first stage piston bar tail portion is set；Institute It states and is equipped with the level-one rodless cavity oil inlet passage being connected with level-one telescopic boom cylinder hydraulic lock and rod chamber oil inlet in first stage piston bar Channel, the level-one rodless cavity oil inlet passage are also connected to the level-one rodless cavity of level-one cylinder barrel, and the rod chamber oil inlet passage is also It is connected to the level-one rod chamber of level-one cylinder barrel；It further include second level telescopic boom cylinder hydraulic lock, level-one cylinder barrel inner core tube and secondary cylinder Oil inlet passage；Described level-one cylinder barrel inner core tube one end is placed in rod chamber oil inlet passage, the other end successively run through first stage piston bar, It is connected to after level-one rodless cavity and level-one cylinder barrel with the second level rod chamber of second level cylinder barrel；The secondary cylinder oil inlet passage is stretched by second level Contracting arm oil cylinder hydraulic lock is connected to the second level rodless cavity of second level cylinder barrel.

As a preferred embodiment, the second level telescopic boom cylinder hydraulic lock is fixed on outside second level cylinder barrel.

As a preferred embodiment, second level rodless cavity oil inlet is provided on the corresponding secondary cylinder barrel of the second level rodless cavity Mouthful, second level rodless cavity oil inlet is connect by hard tube with second level telescopic boom cylinder hydraulic lock.

As a preferred embodiment, the second level rodless cavity oil inlet is located remotely from the secondary cylinder barrel of first stage piston bar On.

As a preferred embodiment, oilhole is offered on the corresponding secondary cylinder barrel of the second level rod chamber, be used for and phase The rod chamber oil circuit connection of adjacent oil cylinder.

Specifically, the rod chamber oil inlet passage tail end is connected with first stage piston club head, front end closing；It is described to have bar The first stage piston bar that chamber oil inlet passage closes end side surface is equipped with the wing passage of connection rod chamber oil inlet passage and level-one rod chamber.

More specifically, the level-one cylinder barrel inner core tube includes straight pipe and bending segment, the endpiece of the straight pipe is located at In rod chamber oil inlet passage, and the leading portion of straight pipe enters level-one rodless cavity behind rod chamber oil inlet passage closed end；It is described Bending segment is in U-shape and is located in the front end face of level-one cylinder barrel, and one end is connected to second level rod chamber, the other end and level-one rodless cavity Interior straight pipe leading portion connection.

As a preferred embodiment, the level-one telescopic boom cylinder hydraulic lock and second level telescopic boom cylinder hydraulic lock are flat Weigh valve.

Compared with prior art, the invention has the following advantages:

Two-stage stretching arm oil cylinder first-stage cylinder hydraulic lock is arranged in first stage piston bar tail portion, first-stage cylinder rodless cavity oil by the present invention Road enters from first stage piston bar, and secondary cylinder rodless cavity oil circuit is with tracking hose by two-level oil cylinder's hydraulic lock and between second level cylinder barrel Hard tube enters, and rod chamber oil circuit enters first-stage cylinder rod chamber from first stage piston bar tail portion, at the same by level-one cylinder barrel inner core tube into Enter secondary cylinder rod chamber, using as two-level oil cylinder's rod chamber oil passage.In this way, level-one cylinder piston rod internal channel can be made to reduce, The sandwich of level-one cylinder barrel is also eliminated simultaneously, under the premise of not changing cylinder diameter and bar diameter, greatly reduces two-stage stretching The processing and manufacturing difficulty of arm oil cylinder mitigates oil cylinder or other mechanism weight, makes to be simple to manufacture, light weight and cost is low.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of two-stage stretching arm oil cylinder conventional in the prior art；

Fig. 2 is schematic structural view of the invention.

Wherein, the corresponding title of appended drawing reference are as follows:

1- level-one cylinder barrel, 11- level-one rod chamber, 12- level-one rodless cavity, 2- second level cylinder barrel, 21- second level rod chamber, 22- bis- Grade rodless cavity, 23- second level rodless cavity oil inlet, 24- oilhole, 3- first stage piston bar, 31- level-one rodless cavity oil inlet passage, 32- have Rod cavity oil inlet passage, 33- wing passage, 4- level-one telescopic boom cylinder hydraulic lock, 5- second level telescopic boom cylinder hydraulic lock, 6- first-stage cylinder Cylinder inner core tube, 7- secondary cylinder oil inlet passage.

Specific embodiment

The invention will be further described with embodiment for explanation with reference to the accompanying drawing, and mode of the invention includes but not only limits In following embodiment.

The purpose of the present embodiment is to provide for that a kind of manufacture difficulty is low, more economical and practical automobile with long service life Crane two-stage stretching arm oil cylinder.Referring to Fig. 1 and Fig. 2 it can be found that the main structure of the present embodiment and prior art part phase Together, such as: including second level cylinder barrel 2, the level-one cylinder barrel 1 being connected in second level cylinder barrel, the first stage piston being connected in level-one cylinder barrel Bar 3, and the level-one telescopic boom cylinder hydraulic lock 4 of first stage piston bar tail portion is set；It is equipped in the first stage piston bar 3 with one Grade telescopic boom cylinder hydraulic lock connected level-one rodless cavity oil inlet passage 31 and rod chamber oil inlet passage 32, the level-one rodless cavity Oil inlet passage 31 is also connected to the level-one rodless cavity 12 of level-one cylinder barrel 1, the rod chamber oil inlet passage 32 also with level-one cylinder barrel Level-one rod chamber 11 is connected to.However, in the prior art this kind of two-stage stretching arm oil cylinder (oil cylinder as shown in Figure 1) cylinder barrel diameter compared with Greatly, overall processing difficulty is big (especially level-one cylinder barrel and first stage piston bar, structure is complicated for the two, required precision is high), at high cost, And whole oil cylinder heavier mass, it influences crane and hangs load performance, be unfavorable for medium and small volume production and use, also there is no good at present Mode makes improvements.

The present embodiment furthers investigate autocrane two-shipper telescopic boom cylinder in view of the above status, creative Propose two-level oil cylinder's hydraulic lock that first stage piston bar tail portion is arranged in originally is independent, and by level-one telescopic boom cylinder Wick pipe is crossed in cylinder barrel as the public contracting chamber of two-stage stretching arm oil cylinder, two-level oil cylinder's rod chamber is connected to, to ensure in cylinder diameter and bar Under the premise of diameter is equivalent, processing and manufacturing difficulty (especially the level-one cylinder barrel and first stage piston bar of two-stage stretching arm oil cylinder are reduced Difficulty of processing), mitigate oil cylinder or other mechanism weight, and then reduce cost.

Specifically, referring to fig. 2, the present embodiment oil cylinder thes improvement is that the oil cylinder further comprises in level-one cylinder barrel Core pipe 6 and secondary cylinder oil inlet passage 7, and level-one telescopic boom cylinder hydraulic lock 4 is set in first stage piston bar tail portion respectively, in second level Second level telescopic boom cylinder hydraulic lock 5 is set outside cylinder barrel.Specifically, 32 tail end of rod chamber oil inlet passage and first stage piston 3 head of bar be connected (in attached drawing 2, B and rod chamber oil inlet passage 32 are communicated, and B is only a connecting hole of first stage piston club head, This specific connection type and structure design with it is identical in the prior art, this will not be repeated here), front end close；The rod chamber into The first stage piston bar 3 that end side surface is closed in oily channel 32 is equipped with the wing passage of connection rod chamber oil inlet passage and level-one rod chamber 11 33, in this way, first-stage cylinder can be realized by 3 head oil inlet B of first stage piston bar, rod chamber oil inlet passage 32, wing passage 33 The oil inlet of cylinder rod chamber.The level-one cylinder barrel inner core tube 6 includes straight pipe and bending segment, and the endpiece of the straight pipe, which is located at, bar In chamber oil inlet passage 32, and the leading portion of straight pipe enters level-one rodless cavity 12 behind 32 closed end of rod chamber oil inlet passage；Institute Bending segment is stated to be in U-shape and be located in the front end face of level-one cylinder barrel, one end is connected to second level rod chamber 21, the other end and level-one without Straight pipe leading portion connection in rod cavity 12, in this way, 3 head oil inlet B of first stage piston bar, rod chamber oil inlet passage can be passed through 32, the straight pipe of level-one cylinder barrel inner core tube, level-one cylinder barrel inner core tube bending segment realize the oil inlet of second level cylinder barrel rod chamber.It should Level-one cylinder barrel inner core tube is easy to process, can reliably guarantee the sealing requirements of oil cylinder, compared to the prior art in pass through first-stage cylinder The Sandwich pipeline or piston Oil Guide of cylinder enter for second level cylinder barrel rod chamber, and the inner hole and outer wall precision for eliminating interlayer pipe add The process (since oil passage size is smaller, difficulty of processing is not general big) of work, greatly reduces difficulty of processing.And And this channel to level-one cylinder barrel rod chamber oil inlet is arranged, and also avoids increasing tracking hose mechanism between two, three joint arms, And then the size for avoiding three joint arms short transverse increases, and mitigates crane arm weight, practicability is stronger.

Wherein, the oil inlet mode of level-one cylinder barrel rodless cavity and oil inlet passage do not improve.And the oil inlet mode of second level cylinder barrel But changed, be that second level telescopic boom cylinder hydraulic lock 5 is fixed on outside second level cylinder barrel first, it so can be living convenient for level-one Stopper rod inner oil tube arrangement, is then arranged the oil inlet of second level rodless cavity on the second level cylinder barrel 2 of second level cylinder barrel rodless cavity forefront side Mouth 23, second level rodless cavity oil inlet are connect by hard tube with second level telescopic boom cylinder hydraulic lock 5.Then, made using tracking hose For secondary cylinder oil inlet passage 7, second level cylinder barrel rodless cavity is connected with hard tube by second level telescopic boom cylinder hydraulic lock 5.

The level-one telescopic boom cylinder hydraulic lock 4 and second level telescopic boom cylinder hydraulic lock 5 are balanced valve, be one at Ripe existing apparatus, also, the use after its connection type and connection with each pipeline is extremely mature, and the application is not to it It improves, therefore this will not be repeated here.Further, since on crane products twin-stage cylinder usually also with an other twin-stage cylinder or list Grade cylinder is used cooperatively, therefore, to realize that twin-stage is connect with the combination of other oil cylinders, the corresponding secondary cylinder of the second level rod chamber 21 The oilhole 24 for the public contracting chamber connection connecting with other oil cylinders is offered on 2 walls of cylinder, also, the setting position of the oilhole 24 is by oil The influence of cylinder structure and working condition can only be arranged on the side wall of second level cylinder barrel tail portion.

Using this novel two stage telescopic boom cylinder of the present embodiment, oil cylinder can be reduced and manufacture difficulty, it is easy to process, Cost can be also reduced, mitigates oil cylinder and related components weight and arrangement of mechanism difficulty, has the advantages that economic and practical.