SU1504300A1 - Hydraulic drive of rotary-milling snow-removing machine - Google Patents

Abstract

The invention relates to machines for winter maintenance of roads, urban areas and airfields, mainly of the type of milling rotary snowplows. The purpose of the invention is to increase efficiency by automatically synchronizing the rotational speed of the cutter with the frequency of rotation of the motors of the drive wheels of the right and left sides of the machine. The hydraulic drive of the milling rotary snowplow contains the motors of the driving wheels 2 with a steer and a milling cutter 6 consisting of two independent branches. The drive pump for the motors of the wheels 2 is adjustable and kinematically connected to the controls associated with the motors for the drive cutter 6. Turning the pull 1 changes the rotation frequency of the hydromotors of one of the sides and automatically changes the rotation frequency of the corresponding branch of the cutter 6. This reduces the turning moment per tonne 1 and increases maneuverability. 2 hp f-ly. 3 il.

Description

one

(21) 4358028 / 27-11

(22) 04.01,88

(46) 08/30/89. Bksh. Number 32

(71) Moscow Automobile and Road Institute

(72) A. B. Ermilov, G. S. Mirzo and I. A. Bardachidze

(53) 625.768.5 (088.8-)

(56) Ivanov A.N., Mishin V.A. Snow plows with swinging action. M .: Mashinostroenie, 1981, p. 24

(54) MOTOR-ROTARY HYDROCLEANER GYRO-DRIVE

(57) The invention relates to machines for winter maintenance of motor roads, urban areas and airfields, mainly of the type of milling rotary snow plows. The purpose of the invention is to increase efficiency by automatically synchronizing the frequency of rotation of the cutter with the frequency of rotation of the motors of the drive wheels of the right and left sides of the machine. The hydraulic drive of the milling rotary snowplow contains the motors of the driving wheels 2 with a steer and a milling cutter 6 consisting of two independent branches. The drive pump for wheel motors 2 Bypoln1 {is adjustable and kinematically connected to control elements associated with the drive motors of the milling cutter 6. When the cog rotates, the rotation frequency of the hydraulic motors of one of the sides changes and the rotation frequency of the corresponding milling branch 6 automatically changes. the unfolding moment on t hash 1 and Govovsch maneuverability. 2 3.p. f-ly, 3 pp.

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The invention relates to machines for the maintenance of a {a) accessible roads, urban areas and airfields, and of the type of milling rotary snow plow.

The aim of the invention is to increase efficiency by automatically synchronizing the frequency of the mill cutter with the rotational speed of the drive wheels of the right and left sides.

Figure 1 shows a schematic of a fraser-rotor O 1H snow plow based on a small-sized gacha with a steer, side view; figure 2 is the same, view a in figure 1; on fig.Z - schematic diagram of the hydraulic drive cutter and drive wheels.

Hydraulic frezerpo-rotor

special cleaning equipment on the basis of the wheel t - 20 control cavities to each other

Gacha 1 contains a hydrovolume drive of the driving wheels 2 with a skid. Pt tackle 1 by means of hydraulic cylinders 3 and parallelogram levers 4 mounted working body 5 with a milling cutter 6 and discharge nozzle 7. The milling cutter is made in the form of two BeTBeii: right 8 and left 9, - which are connected to hydraulic motors 10 and 11.

The hydraulic system contains a pump 12, connected by pressure pipes 13 to hydraulic motors 10 and 11 for driving the cutter branches, and a controlled pump 14 that is connected via side distributors I5 to reversing hydraulic motors 16 and 17 for driving wheels 2 from the right and left sides of the snow plow As well as with hydrocype. During forward movement I of the machine, the p-motor 16 and 17 of the leading 30 wheels 2 rotate at the same angular speed, as well as the hydraulic motors 1.0 and 11, which provide the same frequency of rotation for the right 8 and left 9 branches of the milling cutter 6. Cutting Solid -jr snow cutter 6 is discharged through the guide pipe 7 in the direction of arrow B (Figure 2). With increasing snow strength or increasing snow thickness, the molindra 3 rises and lowers the working body and the hydraulic cylinder 18 increases resistance to rotation of the branches of the company of the exhaust pipe 7 in horizon-8 and 9 of the milling cutter 6, respectively, on the outer plane. The drain pipes 19 connect the hydraulic units to the tank 20. With the control pump 14, the rod of the main spring hydraulic cylinder 21 is kinematically connected, the piston cavity of which is connected to the drain pipe 19 of the hydraulic motors 10 and 11 through the safety valve 22.

Follower} with r idromotors

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fluid pressure in pressure pipelines 13 and fluid pressure in drain pipes -19 of hydraulic motors 10 and 11 decrease, which causes the spring hydraulic cylinder 21 to retract and reduce the flow of the controllable pump 14. This reduces the rotational speed of the hydraulic motors 16 and 17 and decreases supplying the machine in a portable movement one revolution of the milling cutter 6 to a level determined by the optimal value of the moment of resistance to the rotation of the milling cutter 6 and set by the presetting safety valve 22. Um The failure of the moment of resistance to rotation of the milling cutter 6 causes the pushing of the spring hydroshishpd10 and 11 stem in the pressure pipelines 13 installed adjustable throttles 23 and 24 connected by kinematic connections 25 to flow sensors, which are made in B1 more than additional: spring hydraulic connectors 26 and 27 connected by their own reciprocating and flow cavities; pairs;

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jiHciN-biM throttle m 28 and 29. The latter are installed in series with the hydraulic motors 16 and 17 of the snowplow driving wheels, and parallel to the controlled throttle m 28 and 29 are connected check valves 30, mounted closed in the direction of rotation of the hydraulic motors 16 and 17 of the driving wheels, corresponding to the working stroke Snow plow Fig. 1, arrow B. The piston cavity of the main spring hydro-cylinder 2I is connected to the drain piping of 19 g of hydraulic motors 10 and I1 through the middle section channel of the three-section three-position hydraulically controlled distribution ate 31, side sections which vypolnepy with trapped channels and between protivopolozhpodklyucheny controllable choke 28 and 29 and padromotorami 16 and 17 of the drive wheels 2. In parallel pressure relief valve 22 usta- Credited return valve 32.

Milling rotor snow plow works as follows.

During the forward movement of the machine I, the p-shchromotors 16 and 17 of the driving wheels 2 rotate at the same angular speed, as do the hydraulic motors 1.0 and 11, which provide the same rotation frequency of the right 8 and left 9 branches of the cutter 6. Cut out of solid wood is thrown by the mill 6 through guide tube 7 in the direction of arrow B (Fig. 2). With increasing snow strength or increasing snow cover thickness, the resistance to rotation of branches 8 and 9 of cutter 6 increases, respectively, increasing

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fluid pressure in pressure pipelines 13 and fluid pressure in drain pipes -19 of hydraulic motors 10 and 11 decrease, which causes the spring hydraulic cylinder 21 to retract and reduce the flow of the controllable pump 14. This reduces the rotational speed of the hydraulic motors 16 and 17 and decreases supplying the machine in a portable movement one revolution of the milling cutter 6 to a level determined by the optimal value of the moment of resistance to the rotation of the milling cutter 6 and set by the presetting safety valve 22. Um nshenie torque resistance to the rotation cutters 6 causes the ejection rod 21 and the spring gidroshishpdpa upelichenie gkzdachi machine in one revolution of the cutter.

When the machine moves along curvilinear trajectories characteristic of working in urban conditions when clearing snow from sidewalks, inner yard roads and territories, a different frequency of rotation of the hydraulic motors 16 and 17 of the leading wheels of the right and left sides of the snow plow is provided. At the same time, the branch of the milling cutter 6, corresponding to the driving wheels 2 of the driving side 2 of the machine, processes a larger volume of cHei a per unit of time than the other branch of the milling cutter corresponding to the lagging side of the machine. Since the frontal resistance of the joint modeys of the 6 cutters with the snow face is approximately proportional to reprocessing snow per unit of time, then a larger frontal resistance acts on the branch 8 of the forward runner 6, which creates a turning moment of forces. At the same time, the moment of resistance to the rotation of the branch 8 of the bead milling cutter 6 increases, which leads to an increase in pressure in the pressure line 13 of the hydraulic motor of this branch of the mill 8, for example the hydraulic motor 10, and a decrease in pressure in its drain pipe 19. At the same time The hydromotor of the driving wheels 2 of the running side, in this case the hydromotor 16, increases, which leads to a pressure differential on the throttle 28 and to extend the stem of the spring hydraulic cylinder 26, which by means of a kinematic connection 25 opens adjustable throttle 23 and thereby increases the rotational speed of the hydraulic motor 10. At the same time, the snow thrower feeds one revolution of the milling cutter 8 corresponding to the pedomotor 10 and reduces frontal resistance of the snow blower to this milling cutter 8, which reduces to a minimum unwrapping moment acting on the cutters 6 in the curvature of the movement. The differential frequency of rotation of the driving motor motors 16 and 17 in the course of curvilinear motion leads to an automatic switching of the hydraulic distributor 31 to one of the extreme positions, thereby blocking the connection of the spring hydraulic cylinder 21 with the drain lines 19

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hydraulic motors 10 and II in order to avoid unstable control mode. Equalizing the rotational speed of the hydraulic motors 16 and 17 again leads to automatic switching of the distributor 31 to the middle position, and the spring hydraulic cylinder 21 again begins to control the flow of the pump 14 depending on the rotation resistance of the UE and pressure in the drain pipes of the hydraulic motors 10 and II drive cutters. In addition, during curvilinear motion, the operator, via the hydraulic cylinder 18, controls the position of the exhaust nozzle 7 and changes the direction of snow emission.

Claims (3)

1. The hydraulic drive of the milling rotary snowplow containing the drive motors of the right and left cutter branches, the drive motors of the drive wheels of the right and left sides, connected by pressure pipelines with pumps and drain - with a tank, the main hydraulic cylinder with a spring 5 of the piston cavity of which is connected to the drain pipes of the cutter drive motors, kighematically connected by its rod to the feed pump of drive wheel drive motors, which is adjustable, that, in order to increase efficiency by automatically siping up the frequency of the motors of the cutter drive with the frequency of rotation of the motors of the driving wheels of the right and left sides, it is equipped with adjustable throttle settings sequentially with drive motors of the right and left cutter branches, kinematically connected with flow sensors, which are mounted in series with drive motors for driving 1x wheels, respectively, of the right and left sides, and check valves; 3aKpbrrbihni in the direction of the drive wheel motors and paraplelno flow sensors . 2. Hydro water in accordance with claim 1, characterized in that, in order to increase reliability, it is equipped with controllable throttles connected in parallel with the flow sensors, which are filled in the form of additional hydraulic cylinders with springs and the piston cavities of which are connected in parallel to the check valves, and the rods are kinematically connected to adjustable throttles. 3. The hydraulic actuator for PP. 1 and 2 оt - which is characterized by the fact that, in order to increase the reliability, it is equipped three-position hydraulically driven drive wheels; Vida The predptelem, the side sections of which are made with separated channels, dripped the middle section connected to the piston cavity of the main hydrocylinder and to the SLNV11 pipelines of the cutter drive motors, and the control cavities are connected between controlled droplets and hydraulic motors ,five 1 20