CN203568725U

CN203568725U - Hydraulic driving system for railway crane

Info

Publication number: CN203568725U
Application number: CN201320507595.0U
Authority: CN
Inventors: 王红兵; 张靖; 王晓东
Original assignee: CRRC Lanzhou Co Ltd
Current assignee: CRRC Lanzhou Co Ltd
Priority date: 2013-08-19
Filing date: 2013-08-19
Publication date: 2014-04-30
Anticipated expiration: 2023-08-19

Abstract

The utility model provides a hydraulic driving system for a railway crane. The hydraulic driving system comprises a hydraulic pump unit and a control loop, wherein the control loop is provided with a first pressure output end and a second pressure output end, which are used for providing working pressure. The hydraulic driving system also comprises a variable-displacement hydraulic motor, wherein the variable-displacement hydraulic motor is provided with a first input end, a second input end and a torque output end for driving an axle of the railway crane to rotate; the first and second input ends are connected with the first and second pressure output ends respectively, and are used for adjusting rotating speed output by the torque output end according to the working pressure. According to the hydraulic driving system for the railway crane, the variable-displacement hydraulic motor is used for automatically regulating the running speed of the crane according to a current load condition to switch between a high-speed traveling working condition and a hoisting self-propelled traveling working condition of the railway crane, so that the manufacturing cost of the railway crane is lowered; the hydraulic driving system is convenient to maintain, so that the maintenance cost is lowered.

Description

Locomotive crane fluid power system

Technical field

The utility model relates to weight-lifting equipment manufacturing technology, relates in particular to a kind of locomotive crane driving control system.

Background technology

Locomotive crane is according to being divided into high speed walking states and the lift heavy walking states of relying on oneself in operation process, and wherein high speed walking states is to park the transfer requirement of place to the longer distance of operating location in order to meet locomotive crane, and moving velocity is very fast; The lift heavy walking states of relying on oneself needs its arm to hang prudent thing slowly to move; Be that locomotive crane is walked at a high speed need to realize light condition time, low speed walking during heavy duty.

In the prior art, the fluid power system of locomotive crane can be arm provides operation pressure, for walking, provides power; But, the power providing for walking is invariable, need to realize by the multistage speed ratio transmission of retarder the switching that high speed walking states and lift heavy are relied on oneself between walking states, and this class retarder cost is higher, oad is larger, also be not easy to safeguard, thereby, caused existing locomotive crane manufacturing cost and maintenance cost higher.

Utility model content

For above-mentioned defect of the prior art, the utility model provides a kind of locomotive crane fluid power system, by fluid control, realizes the rely on oneself switching of walking states of locomotive crane high speed walking states and lift heavy, to reduce, manufactures and maintenance cost.

The utility model provides a kind of locomotive crane fluid power system, comprise: Hydraulic Pump group and control loop, described control loop has for the first pressure output end and second pressure output end of operation pressure are provided, also comprise variable hydraulic motor, described variable hydraulic motor has first input end, the second input end and drives the moment of torsion mouth of the axletree rotation of locomotive crane; Described first input end is connected with the second pressure output end with described the first pressure output end respectively with the second input end, for regulate the rotating speed of described moment of torsion mouth output according to described operation pressure.

Locomotive crane fluid power system as above, preferably, described variable hydraulic motor comprises:

An axial piston motor, the mouth of described axial piston motor is described moment of torsion mouth, and described first input end and the second input end are connected to two input ports of described axial piston motor;

A two-bit triplet servovalve, is connected with described first input end, the second input end respectively, for reaching predetermined threshold value at described operation pressure, switches;

One double acting hydraulic cylinder, two hydraulic fluid ports of described double acting hydraulic cylinder are connected with described two-bit triplet servovalve, and the piston rod of described double acting hydraulic cylinder is connected with the swash plate of described axial piston motor, for driving described swash plate to swing by the mobile of piston rod under the described operation pressure effect through the transmission of described two-bit triplet servovalve.

Locomotive crane fluid power system as above, preferably, described the first pressure output end output oil pressure is greater than or less than described the second pressure output end, and the oil pressure between described the first pressure output end and the second pressure output end poor be described operation pressure.

The locomotive crane fluid power system that the utility model provides, by adopting variable hydraulic motor, can automatically adjust hoisting crane running velocity according to present load situation, only need to adopt the multi-change speed ratio speed reducer that there is common retarder and can automatically switch without employing, can realize the switching that locomotive crane is walked at a high speed and lift heavy is relied on oneself between two kinds of operating modes of walking, reduced the manufacturing cost of railway machine, and hydraulic system maintenance is more convenient, also reduced maintenance cost.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model locomotive crane fluid power system embodiment;

Fig. 2 is the fundamental diagram of variable hydraulic motor in Fig. 1.

The specific embodiment

Fig. 1 is the structural representation of the utility model locomotive crane fluid power system embodiment; As shown in Figure 1, the present embodiment provides a kind of locomotive crane fluid power system, comprising: Hydraulic Pump group 1 and control loop 2, and control loop 2 has for operation pressure the first pressure output end 21 and the second pressure output end 22 are provided; Also comprise variable hydraulic motor 3, variable hydraulic motor has first input end 31, the second input end 32 and drives the moment of torsion mouth 33 of the axletree rotation of locomotive crane; First input end 31 is connected with the second pressure output end 22 with the first pressure output end 21 respectively with the second input end 32, for regulate the rotating speed of moment of torsion mouth 33 outputs according to above-mentioned operation pressure.

Particularly, Hydraulic Pump group 21 can be pressurizeed oil in fuel tank and flow to control loop 2, controls the hydraulic pressure running mechanism work of locomotive crane for control loop; Control loop 2 has the first pressure output end 21 and the second pressure output end 22, so that the operation pressure of the current loaded state of reflection is exported.Wherein, operation pressure is oil pressure poor of the first pressure output end 21 and the output of the second pressure output end 22, and, can also realize by controlling the relative size of the first pressure output end 21 and the second pressure output end 22 output oil pressures the forward or reverse of axle shaft, and then realize and advance or retreat; For example, when the first pressure output end 21 is greater than the second pressure output end 22, drive variable hydraulic motor forward, and then drive locomotive crane to advance, when the first pressure output end 21 is less than the oil pressure of the second pressure output end 22, the reversion of driving variable hydraulic motor, and then drive locomotive crane to retreat.It should be noted that, the pressure of the pressure of the first mouth and the second mouth is generally realized with each valve of controlling in control loop 2 by the joystick of moving in locomotive crane driver's cab, comprise that controlling railway lifting advances or retreat, and advance or fallback state under with carrying, change and adjust the operation pressure of exporting.

The first input end 31 of variable hydraulic motor 3 and the second input end 31 can be respectively by oil circuit or be directly connected to the first pressure output end 21 and the second pressure output end 22 on, so that the operation pressure of control loop 2 outputs is converted to output torque by variable hydraulic motor 3, and drive axletree to rotate, and, when the load of locomotive crane changes and makes to export to the change of pressure of variable

hydraulic motor

3, 3 of variable hydraulic motors can be adjusted according to change of pressure amount moment of torsion and the rotating speed of output thereupon, and then axletree rotating speed and present load situation are matched, that is, if locomotive crane present load is larger, the operation pressure of exporting to variable hydraulic motor 3 is larger, and variable hydraulic motor 3 can be according to the less rotating speed of this larger operation pressure output, to realize low speed walking, meets the rely on oneself demand of walking operating mode of lift heavy, and if present load is less, operation pressure is also less, and variable hydraulic motor 3 can be according to the larger rotating speed of this less operation pressure output, to realize axletree High Rotation Speed, the satisfied high speed operating mode demand of walking that drives.Certainly, above-mentionedly according to load variations, adjust arbitrary situation that the process of motor output torque and rotational speed is advanced applicable to locomotive crane or retreated.

The locomotive crane fluid power system that the present embodiment provides, by adopting variable hydraulic motor, can automatically adjust lifting running velocity according to present load situation, only need to adopt the multi-change speed ratio speed reducer that there is common retarder and can automatically switch without employing, can realize the switching that locomotive crane is walked at a high speed and lift heavy is relied on oneself between two kinds of operating modes of walking, reduced the manufacturing cost of railway machine, and hydraulic system maintenance is more convenient, also reduced maintenance cost.

Fig. 2 is the fundamental diagram of variable hydraulic motor in Fig. 1.Below in conjunction with Fig. 2, describe variable hydraulic motor 3 in detail according to the detailed process of operation pressure output rotating speed regulation.

As shown in Figure 2, variable hydraulic motor 3 can comprise:

An axial piston motor 301, the mouth of axial piston motor 301 is moment of torsion mouth 33, and first input end 31 and the second input end 32 are connected to two input ports of axial piston motor 301; A two-bit triplet servovalve 34, is connected with first input end 31, the second input end 32 respectively, for reaching predetermined threshold value at above-mentioned operation pressure, switches; One double acting hydraulic cylinder 35, two hydraulic fluid ports of double acting hydraulic cylinder 35 are connected with two-bit triplet servovalve 34, and the piston rod of double acting hydraulic cylinder 35 is connected with the swash plate 302 of axial piston motor 301, for the mobile swash plate 302 that drives by piston rod under the above-mentioned operation pressure effect transmitting through two-bit triplet servovalve 34, swing.

Wherein, the swash plate of axial piston motor 301 reciprocally swings, and the deflection angle (be swash plate and plunger axis between angle) of swash plate is constantly changed, thereby the rotating speed of its output is constantly changed thereupon; And the corresponding corresponding output speed of each specific deflection angle of swash plate.

Particularly, axial piston motor 301, double acting hydraulic cylinder 35 and two-bit triplet servovalve 34 can be connected to form according to form as shown in Figure 2 a hydraulic circuit; Wherein, first input end 31 and the second input end 32 can be connected to respectively an interface of two-bit triplet servovalve 34 after the first check valve 311 and the second check valve 322, and are also connected with a hydraulic fluid port of double acting hydraulic cylinder 35 simultaneously; Another hydraulic fluid port of double acting hydraulic cylinder 35 is connected with another interface of two-bit triplet servovalve 34; First input end 31 is also connected with the control end of two-bit triplet servovalve 34 with the second input end 32; The piston rod of double acting hydraulic cylinder 35 can be hinged with top or the bottom of swash plate, with the mobile swash plate that drives by piston rod, swings.The present embodiment be take and entered into first input end 31 oil pressure and working process is described as example higher than the second input end 32 oil pressure:

When locomotive crane heavy duty, the operation pressure of control loop output is higher, the oil pressure higher (predetermined threshold value that surpasses two-bit triplet servovalve 34) that enters into the first mouth 31, this high pressure oil acts on the control end of two-bit triplet servovalve 34 after the first check valve 11, two-bit triplet servovalve 34 is surpassed and overcome the one side switching of spring place, the first working position 341 is linked in loop, make the high pressure oil being entered by first input end 31 after the first working position 341 of the first check valve 311 and two-bit triplet servovalve 34, enter into the left side oil pocket of double acting hydraulic cylinder 35, drive the piston rod of double acting hydraulic cylinder 35 to move along F direction, thereby drive swash plate to swing towards the less direction of rotating speed by piston rod, axial piston motor 301 output slow speed of revolutions.When locomotive crane load reduces gradually, the operation pressure of being exported by control loop decreases, the oil pressure that enters into first input end 31 reduces, when this oil pressure is during lower than the predetermined threshold value of two-bit triplet servovalve 34, two-bit triplet servovalve 34 returns back to the second working position 342 under the effect of spring, the oil being entered by first input end 31 cannot flow to double acting hydraulic cylinder 35 through two-bit triplet servovalve 34 again, but be fed directly in the right side oil pocket of double acting hydraulic cylinder 35, at the oily pressure-acting lower piston rod constantly flowing into, along the direction contrary with F, move, thereby the swash plate that drives axial piston motor 301 swings the larger side of revolution speed, the high rotating speed of axial piston motor 301 output.

Certainly, when the oil pressure of first input end 31, also can realize above-mentioned adjustment of rotational speed during lower than the second input end 32, its specific implementation principle is similar, repeats no more herein.That is to say, the fluid power system of the present embodiment all can be realized according to carrying situation and adjust the speed of travel in the situation of moving forward and backward, and has conveniently met locomotive crane in the switching of walking at a high speed and lift heavy is relied on oneself between traveling operating mode.

Finally it should be noted that: each embodiment, only in order to the technical solution of the utility model to be described, is not intended to limit above; Although the utility model is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.

Claims

1. a locomotive crane fluid power system, comprise: Hydraulic Pump group and control loop, described control loop has for the first pressure output end and second pressure output end of operation pressure are provided, it is characterized in that, also comprise variable hydraulic motor, described variable hydraulic motor has first input end, the second input end and drives the moment of torsion mouth of the axletree rotation of locomotive crane; Described first input end is connected with the second pressure output end with described the first pressure output end respectively with the second input end, for regulate the rotating speed of described moment of torsion mouth output according to described operation pressure.

2. locomotive crane fluid power system according to claim 1, is characterized in that, described variable hydraulic motor comprises:

3. locomotive crane fluid power system according to claim 1 and 2, it is characterized in that, described the first pressure output end output oil pressure is greater than or less than described the second pressure output end, and the oil pressure between described the first pressure output end and the second pressure output end poor be described operation pressure.