SU757654A1 - Limiter of traction effort of tractor with mounted soil-working equipment - Google Patents

Description

The device relates to machines for earthmoving and reclamation works on the basis of agricultural and industrial tractors in the mounted 5 version.

Known limiter traction force tractor, with mounted earthmoving equipment, in which the power cylinder of the mechanism 10 of the hinge with an increase in tractive effort provides automatic recessing of the working body, and with a decrease - depth [1].

A tractor 15 force limiter with mounted earthmoving equipment is known, which includes a clutch release lever, a safety valve, the pressure chamber of which is connected to the reactive pressure cavity of the fluid in the hydraulic cylinder of the hitch mechanism and installed parallel to it a check valve [2] .

However, when ¹ 'bypass ¹ ' of these devices is an insurmountable obstacle, conditions are created for blunting and breaking the working tool.

The purpose of the invention is the protection of the tractor and attachments 30

overload by stopping workflow.

This goal is achieved due to the fact that the tractor force limiter with mounted earthmoving equipment is equipped with a plunger hydraulic cylinder, and the clutch release lever is provided with an additional arm that interacts with the plunger hydraulic rod, the cavity of which is connected to the drain cavity of the safety valve.

A diagram of the tractor pullback limiter applied to a mounted digging machine based on a tractor with an active working body is shown in the drawing.

Earthmoving equipment 1 is mounted on the rear linkage mechanism 2 of the tractor 3.

The hitch mechanism includes a hydraulic cylinder 4, which is controlled by a spool, a hydraulic distributor 5. A safety valve 6 is included in the limiter, the pressure cavity of which is connected to the piston cavity of the hydraulic cylinder 4, and the return valve

3

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four

valve 7 connected in parallel with the safety valve.

The drain line of the safety valve 6 is connected to the cavity of the plunger hydraulic cylinder 8, the sleeve of which is hinged to the inner wall of the spar of the tractor. Lever 9 is a part of the mechanism for disengaging the clutch from the tractor cab. For connection with the plunger hydraulic cylinder, it is made with an additional arm 10, which is connected to the cylinder stem 8. The cylinder rod can rotate the double-arm lever, disabling the coupling only when it is extended, which is provided by an oval hole 11, made at the end of the rod, in which the finger 12 slides freely additional arm 10 two shoulders arm 9. Thus, when the stem is retracted, the installation of the hydraulic cylinder 8 does not impede the control of the clutch from the tractor cab through the thrust 13, since the length of the oval hole I'm at the end of the stem is slightly higher than the course of a finger 12 additional shoulder 10 double-arm lever 9, with on-off clutch.

The device works as follows. In the working position (when digging), both cavities of the hydraulic cylinder'4 are locked with the valve of the distributor 5. In the transport position and at low tractive forces of the tractor, the fluid is compressed in the rod end. For large traction forces close to the maximum permissible value, the reactive compression cavity is a piston one. If the tractor force does not exceed the permissible value, the rod of the hydraulic cylinder 8 is in the retracted position and the limiter does not affect the operation of the tractor systems. With increasing pressure to the maximum allowable pressure-at the inlet of the safety valve b reaches the value of its setting, it passes liquid from the piston cavity of the jet compression of cylinder 4 to the hydraulic cylinder 8 disabling the tractor engine clutch ₁ volume of liquid permeable equal to the working volume of the cylinder 8 is small compared to the working volume of the cylinder 4. a retractable cylinder rod ra 8 produces rotation of a two-armed * Rych n 9 via a pin 12 and disconnecting the tractor clutch. Simultaneously, via the pushrod 13 driven off the tractor clutch mechanism and clutch pedal in the cab moves to the lowermost position. Tractor stopped, all the shafts'

his transmissions and drives for active implements are unloaded from torque. Tractor and attachments are unloaded from

5 overloads - on the load and on the torque moment in the drive of the active working body.

The thrust limiter is returned to its original position from

.θ tractor cab transfer zolotnik distributor 5 in the floating position. Under the action of the clutch clutch springs, the fluid is displaced from the cylinder 8 through a check valve 7

valve spool 5 to drain

• 5 and partially back to piston

cylinder cavity 4. The clutch engages the tractor engine to the transmission and excavation resumes. If the insurmountable obstacle is not removed from the channel channel, the limiter will work again and turn off the rotation and stroke drives. The adjustment of the limiter to a specific tractive effort is ensured by the installation of a safety valve b for a pressure corresponding to this force.

The use of thrust limiting allows you to increase the reliability of the machine’s operation by eliminating emergency loads on the tractor and attachments.

Claims (1)

Claim Traction limiter of the tractor with mounted earthmoving equipment, including a clutch release lever, 40 safety valve, the pressure cavity of which is connected with the cavity of the reactive compression of the fluid in the power cylinder of the attachment mechanism, and installed parallel to it 45 non-return valve, from the fact that, in order to protect the tractor and attachments from overloading by stopping the working process, it is equipped 5θ is a plunger hydraulic cylinder, and the clutch release lever is made with an additional arm that interacts with the plunger hydraulic cylinder rod, the cavity of which is connected to the drain cavity of the safety valve ^{33 of the} valve.