阅读说明：本技术 双作用单出杆对称液压缸 (Double acting list rod symmetrical hydraulic cylinder ) 是由 李宝仁 吴斌 杨钢 于 2019-05-30 设计创作，主要内容包括：本发明涉及液压伺服执行元件技术领域,尤其涉及一种双作用单出杆对称液压缸,有效解决了对称缸双出杆占用空间大的问题；而单出杆缸伸出缩回的对称性解决了单出杆双作用液压缸对称控制必须采用特种伺服阀,从而增加成本的问题；同时,由于运动对称,测量和指令数据不需要进行转化计算,可有效减小控制误差。(The present invention relates to hydraulic servo executive component technical field more particularly to a kind of double acting list rod symmetrical hydraulic cylinder, efficiently solve the problems, such as that the double rod occupied spaces of asymmetric cylinder are big；And single rod cylinder stretch out the symmetry retracted solve that single rod double acting hydraulic cylinder symmetrically control must be using special type servo valve, thus the problem of increasing cost；Simultaneously as movement is symmetrical, measurement and director data do not need to carry out conversion calculating, can effectively reduce control error.)

1. a kind of double acting list rod symmetrical hydraulic cylinder, it is characterised in that: the hydraulic cylinder is symmetrical acting cylinder, including top Portion's end cap (1), cylinder barrel (2), hollow piston rod (3), cylinder inner oil tube (4), piston (5) and bottom head covers (6),

Top end cover (1) and bottom head covers (6) are respectively fixedly disposed at cylinder barrel (2) front-end and back-end,

The bottom head covers (6) are cylindrical-shaped structure, open up a blind hole (61) along axis position on bottom head covers (6) inner face, The periphery of bottom head covers (6) offers fuel feed hole B (62), and fuel feed hole B (62) and blind hole (61) are interconnected,

Cylinder inner oil tube (4) is located in cylinder barrel (2), and the bottom of cylinder inner oil tube (4) is fixedly connected with bottom head covers (6), cylinder inner oil tube (4) bottom is located at blind hole (61) periphery, and is connected inside cylinder inner oil tube (4) with blind hole (61),

Hollow piston rod (3) and piston (5) are sleeved on cylinder inner oil tube (4), and the forward end seal of hollow piston rod (3) and are worn Top end cover (1) out, piston (5) are fixedly connected with the rear end of hollow piston rod (3), are between piston (5) and bottom head covers (6) Discharge chamber (7) offers the gas vent (21) being connected with discharge chamber (7) close to bottom position on cylinder barrel (2),

It is left working chamber (8) between piston (5) and top end cover (1), is offered on the periphery of top end cover (1) and left working chamber (8) the fuel feed hole A (11) being connected,

It is connected inside the inside of hollow piston rod (3) and cylinder inner oil tube (4), the inside of hollow piston rod (3) and cylinder inner oil tube (4) right working chamber (9) is formed inside internal and blind hole (61).

2. double acting list rod symmetrical hydraulic cylinder as described in claim 1, it is characterised in that: the cylinder inner oil tube (4) is transversal Face outer circle area is equal to annulus area folded by the cylinder barrel (2) inner circle and the piston rod (3) inner circle.

3. double acting list rod symmetrical hydraulic cylinder as described in claim 1, it is characterised in that: cylinder inner oil tube (4) length Equal to the cylinder barrel (2) length.

Technical field

The present invention relates to hydraulic servo executive component technical field more particularly to a kind of double acting list rod are symmetrically hydraulic Cylinder.

Background technique

Existing double acting symmetrical hydraulic cylinder is double rods, i.e. there is piston rod stretching at hydraulic cylinder both ends, required by Working space be at least 2 times of hydraulic cylinder length or so, when only there is load in unilateral side, the space of the hydraulic cylinder other end is unrestrained Take, when load is vertical direction, or even needs to punch in ground end, greatly waste space resources and human resources, and outstanding Empty piston rod has certain risk during the motion, however is requiring to load the occasion for doing reciprocal symmetric motion, by In symmetrical hydraulic cylinder convenient for control, control algolithm is simple and easy；The measurement and instruction of control system do not need to be calculated, thus It is higher to control precision；Servo valve does not need the asymmetric customized valve of adapted, the more low characteristic of cost, the demand of symmetrical hydraulic cylinder Greatly.

Therefore, for the demand, a kind of small spatial volume, safety, low cost, high-precision, pair convenient for control are designed Claim hydraulic cylinder, for the reduction of hydraulic system volume, the reduction of cost, the accurate control and control algolithm of load movement optimization It is of great significance and engineering application value.

Summary of the invention

The technical problem to be solved by the present invention is for big, the asymmetrical cylinder that solves asymmetric cylinder occupied space in the prior art Symmetric motion controls technical problems, the present invention such as difficult, at high cost and provides a kind of double acting list rod symmetrical hydraulic cylinder.

The technical solution adopted by the present invention to solve the technical problems is: a kind of double acting list rod symmetrical hydraulic cylinder, institute Stating hydraulic cylinder is symmetrical acting cylinder, including top end cover, cylinder barrel, hollow piston rod, cylinder inner oil tube, piston and bottom end Lid, top end cover and bottom head covers are separately positioned on cylinder barrel front-end and back-end, and the bottom head covers are cylindrical-shaped structure, bottom end A blind hole is opened up along axis position on lid inner face, the periphery of bottom head covers offers fuel feed hole B, and fuel feed hole B and blind hole are mutual Connection, cylinder inner oil tube are located in cylinder barrel, and the bottom of cylinder inner oil tube is fixedly connected with bottom head covers, and the bottom of cylinder inner oil tube is located at blind Hole periphery, and cylinder inner oil tube is connected with blind hole, hollow piston rod and piston are sleeved on cylinder inner oil tube, and hollow piston rod Forward end seal and be pierced by top end cover, piston is fixedly connected with the rear end of hollow piston rod, is between piston and bottom head covers Discharge chamber offers the gas vent being connected with discharge chamber close to bottom position on cylinder barrel, is left between piston and top end cover Working chamber, offers the fuel feed hole A being connected with left working chamber on the periphery of top end cover, in the inside and cylinder of hollow piston rod It is connected inside oil pipe, forms right working chamber inside the inside of hollow piston rod and cylinder inner oil tube and inside blind hole.

In order to guarantee the symmetry and stability of movement, measurement and director data do not need to carry out conversion calculating, reduce and miss Difference, cylinder inner oil tube cross section outer circle area are equal to annulus area folded by the cylinder barrel inner circle and the piston rod inner circle.

Further, in order to guarantee the symmetry and stability that move, the cylinder inner oil tube length is equal to the cylinder barrel length.

The invention has the advantages that double acting list rod symmetrical hydraulic cylinder of the invention, it is double to efficiently solve asymmetric cylinder The big problem of rod occupied space；And the symmetry that single rod cylinder stretches out retraction solves single rod double acting hydraulic cylinder and symmetrically controls System must be using extraordinary servo valve, thus the problem of increasing cost；Simultaneously as movement is symmetrical, measurement and director data are not required to Conversion calculating is carried out, control error can be effectively reduced.

Detailed description of the invention

Present invention will be further explained below with reference to the attached drawings and examples.

Fig. 1 is the structural schematic diagram of double acting list rod symmetrical hydraulic cylinder of the present invention.

Fig. 2 is the structural schematic diagram of double acting list rod symmetrical hydraulic cylinder bottom head covers of the present invention.

Fig. 3 is the structural schematic diagram of double acting list rod symmetrical hydraulic cylinder top end cover of the present invention.

Fig. 4 is the structural schematic diagram of double acting list rod symmetrical hydraulic cylinder piston rod of the present invention.

In figure: 1, top end cover, 11, fuel feed hole A, 2, cylinder barrel, 21, gas vent, 3, hollow piston rod, 4, cylinder inner oil tube, 5, piston, 6, bottom head covers, 61, blind hole, 62, fuel feed hole B, 7, discharge chamber, 8, left working chamber, 9, right working chamber.

Specific embodiment

In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.

It as shown in Figs 1-4, is optimum embodiment of the present invention, a kind of double acting list rod symmetrical hydraulic cylinder, the hydraulic cylinder For symmetrical acting cylinder, including top end cover 1, cylinder barrel 2, hollow piston rod 3, cylinder inner oil tube 4, piston 5 and bottom head covers 6, Top end cover 1 and bottom head covers 6 are separately positioned on 2 front-end and back-end of cylinder barrel, and bottom head covers 6 are cylindrical-shaped structure, bottom head covers 6 A blind hole 61 is opened up along axis position on inner face, the periphery of bottom head covers 6 offers fuel feed hole B62, fuel feed hole B62 and blind hole 61 are interconnected, and cylinder inner oil tube 4 is located in cylinder barrel 2, and the bottom of cylinder inner oil tube 4 is fixedly connected with bottom head covers 6, cylinder inner oil tube 4 Bottom be located at 61 periphery of blind hole, and cylinder inner oil tube 4 is connected with blind hole 61, and hollow piston rod 3 and piston 5 are sleeved in cylinder On oil pipe 4, and the forward end seal of hollow piston rod 3 and it is pierced by top end cover 1, the rear end of piston 5 and hollow piston rod 3 is fixed to be connected It connects, is discharge chamber 7 between piston 5 and bottom head covers 6, close bottom position offers the row being connected with discharge chamber 7 on cylinder barrel 2 Stomata 21 is left working chamber 8 between piston 5 and top end cover 1, offers on the periphery of top end cover 1 and be connected with left working chamber 8 Logical fuel feed hole A11 is connected inside the inside of hollow piston rod 3 and cylinder inner oil tube 4, in the inside and cylinder of hollow piston rod 3 Right working chamber 9 is formed inside 4 inside of oil pipe and blind hole 61.Cylinder barrel 2, cylinder inner oil tube 4, piston 5, top end cover 6 are cylinder Shape structure；Cylinder barrel 2, hollow piston rod 3 and cylinder inner oil tube 4 are coaxially disposed.

4 cross section outer circle area of cylinder inner oil tube is equal to annulus area folded by 3 inner circle of 2 inner circle of cylinder barrel and piston rod.It is oily in cylinder 4 length of pipe is equal to 2 length of cylinder barrel.

The working principle of the invention is: fuel feed hole A11, fuel feed hole B62 are respectively turned on the outlet of servo valve two, fuel feed hole B62 When fuel feeding, fuel feed hole A11 connects fuel tank, is passed through oil liquid in right working chamber 9, hollow piston rod 3 is under the action of high pressure liquid pressure oil It stretches out to the left (left and right is drawing visual angle, the front end Zuo Yewei), the oil liquid being extruded in left working chamber 8 enters oil from fuel feed hole A11 Case；Conversely, B62 mouthfuls of connection fuel tanks of fuel feed hole, left working chamber 8 is passed through oil liquid, and hollow piston rod 3 is in liquid when fuel feed hole A11 fuel feeding It is retracted to the right under the action of pressure oil, the oil liquid that right working chamber 9 is extruded enters fuel tank from fuel feed hole B62；

Since the annulus area that 3 inner circle of hollow piston rod and 2 inner circle difference in areas of cylinder barrel are formed is equal to 4 cross section of cylinder inner oil tube Outer circle area, when fuel feed hole A11, fuel feed hole B62 input the oil liquid of uniform pressure and flow respectively, the thrust that is generated on piston 5 Also equal with shuttle speed, movement has strong symmetry.In Fig. 1 in order to illustrate to understand cylinder inner oil tube 4 and hollow piston rod 3 it Between be have certain gap, but in design 4 outer circle of cylinder inner oil tube cross-sectional area and 2 inner circle of cylinder barrel and hollow piston rod 3 Annulus area is set as equal between inner circle.

Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.