SU1659763A1 - Method for testing portable power module - Google Patents

Abstract

The invention relates to agricultural machinery, in particular, to methods for testing mobile power facilities. The purpose of the invention is to improve the quality of tests by bringing their conditions closer to actual operating conditions. This is achieved in the carrier structure of the mobile power tool by additional torque and bending moments, respectively, relative to its longitudinal and transverse axes by driving the inertial masses of the engine and taking power from the latter with at least one electric brake imitating the attachment tool. These additional moments enhance, due to the realized closed power circuit, the complex stress state in the supporting structure of the mobile power means, excited by vibration action from the cross-drums of the stand and the operation of the engine. The change in the additional torque during the tests according to a given law in the automatic mode makes it possible to simulate the complex stress state and estimate the parameters characterizing the reliability and durability of individual components and parts under the conditions of their functional interconnection. 1 hp f-ly, 2 ill. Yo

Description

The invention relates to agricultural machinery, in particular, to methods for testing mobile power tools working with mounted tools, and can find wide application in the fields of technology involved in the development and research of wheeled vehicles of various functional purposes.

The aim of the invention is to improve the quality of the tests by bringing their conditions closer to the actual operating conditions.

Figure 1 shows the test circuit; Fig. 2 shows the loading scheme of the load bearing structure.

The structural-mobile energy device (Fig. 1) is a combination of such structural elements as a supporting structure 1, on which two axles with wheels 2, 3 are rigidly mounted, an engine 4. At the front and rear hinges of the mobile energy means at least one frame 5, 6 with electric brakes 7, 8, respectively. Transmission 9 for driving video

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The attachment of the implement contains at least one output shaft 10, 11, which is connected to the output shaft of the electric brake 12, 13.

The mobile power tool is mounted on a stand made in the form of a set of running drums mounted on platforms 14, 15 and interacting with servohydraulic pulsators 16, 17. Running drums 18, 19 are driven to bring the controlled wheels 2 to rotate. the drums 20, 21 are braking, which is ensured by the installation of the braking devices 22, 23, and are driven in rotation from the driving wheels of the mobile power means. A method for testing a mobile power tool is automatically implemented. The test is controlled from the computer 24, which is the sensor of the power take-up program by brake 7 (8) from the output shaft 10 (11) to activate the attachment tool, the engine 4 program of the mobile power tool, and the braking program of the running drums 20 , 21 and their linear movement using hydropulsators 16, 17 to simulate soil irregularities (topography of the field).

The computer 24 through the communication device 25, which is a power amplifier, is connected to the engine 4, the electric brake 7 (8), as well as devices such as the hydraulic brake loadr 26 and the hydraulic station 27, and the latter, respectively, to the brake devices mi 22, 23 and servohydraulic pulsators 16, 17 through proportional solenoid valves 28, 29,

During the tests, the pulsators 16, 17, through the chassis, act on the supporting structure 1 of the mobile power means, imitating the unevenness of the soil, and excite in it a complex-stressed state due to the bending and twisting moments relative to the longitudinal axis of the supporting structure, which periodically vary along sign (in accordance with a given program). In this case, the supporting structure 1 also suffers from vibration from a running engine 4. It is rigidly associated with the supporting structure 1 of the base 5 (6) with the electric brake 7, (8) simulates the impact of the weight of the mounted implement on it, causing a bending moment in it relative to the longitudinal axis.

Thanks to the test as the inertial mass simulating the mass of the mounted guns of the electric brake 7 (8), when the latter is in operation, power is taken from the output shaft 10 (11). Simultaneous operation of the engine 4 and

The electric brake 7 (8) makes the stress state of the supporting structure 1 even more difficult, since this creates an additional torque relative to its longitudinal axis.

0 is as follows.

As a result of operation of the engine 4 at idle, mainly due to the rotation of its inertial masses, torque is transmitted to the supporting structure 1

5 Mr.d. (figure 2). When a moment of resistance from the brake 7 (8) imitating the operation of the mounted gun is applied to the shaft 10 (11), an additional torque is transmitted to the supporting structure 1 (M kr.z and / or

0 M cu.), Amplifying the torque of M cu. from the engine running 4 to the value of M kr. M cr.d. + M krZ. (+ Mkr.p).

At the same time, the supporting structure 1 is affected by at least one

5 with a mass of P1 (P2), causing in it the bending moment of the Mizg relative to the transverse axis. The mass P1 (P2) is equal to the total mass of the Electric brake 7 (8) and the frame 5 (6). It creates a moment Mizg (figure 2).

0 The presence of this total moment and the cantilever loading of the supporting structure 1 maximally approximate the testing conditions of the MES to the real conditions of its operation, since the value of the total

5 moments are changed according to a given law by varying the mode of operation of the electric brake 7 (8) and / or engine 4 (automatically, using a computer 24), thereby simulating the operation of a mobile energy

0 means with mounted (mounted) tool (s), taking into account the functional features of the latter.

An electric brake 7 (8) with a bed 5 (6) is mounted on a mobile power means before testing.

The process of accelerated testing of a mobile energy facility installed on a stand is as follows.

0 The engine 4 of the mobile power tool starts, and the gear lever is set to a predetermined position. On command from the control panel (computer 24), the control lever of the hydrotransmission gate valve is set to a position that provides the speed of rotation of the driving wheels 3 of the mobile power means specified by the test program. At the same time, the brakes 22, 23 of the running drums 20, 21 are fed

the command to set the required braking mode for the wheels 3. As brake devices 22, 23, hydraulic pumps can be used connected by mechanical connection to the drums 20, 21. The load level of the brake devices 22, 23 is set using the hydraulic brake loader 26, whose composition includes a proportional safety valve and hydraulic pump, the proportional safety valve being located in the pressure line of the latter. At the command of the computer 24, the setting pressure of the proportional hydraulic hydraulic valve and, consequently, the load level changes. Pulsators 16, 17, the mode of operation of which allows to reproduce the road background, have a hydraulic power of up to 200 kW and are controlled from a computer 24 by electrical signals with a power of up to 5 watts. The control signals have a different shape, defining the nature of the movement of the pulsator rods 16,17. The mode of operation of pulsators 16, 17 is most often a random process with a spectral composition from 0 to 20 Hz.

As an electric brake 7 (8), an electric balance machine is generally used.

The computer 24 changes the resistance of the rheostat included in the circuit of the rotor windings, and thereby establishes the required loading mode of the shaft 10 (11). The rheostat is part of the communication device 25. Monitoring of the preservation of the loading level of the shaft 10 (11) is provided automatically by the software of the computer 24 by comparing the magnitude of the torques on the shaft 10 (11) with the values recorded in the memory of the computer 24.

FORUMAWLAH AND ISLANDS

Claims (2)

1. A method of testing a mobile power tool, which includes vibrating the carrier structure by starting the motor of the mobile power tool and transmission to activate the attachment gun, simultaneously exciting the flexural and torsional alternating moment in the carrier structure relative to its longitudinal axis by applying loads that imitate periodically varying effects through the undercarriage of the relief of the floor, and the registration of parameters, as measured by The value of which is judged on the durability and reliability of the mobile power facility, which is different, in order to improve the quality of testing by approximating their conditions carrying out to real conditions of operation, additional torsional and bending moments, respectively, are generated in the supporting structure relative to its longitudinal and transverse axes by taking power from the shaft, which actuates the attachment simulator, and cantilever loading the supporting structure relative to its transverse axis with an inertial mass, at the same time additional torque is changed during the test. 2. A method according to claim 1, characterized in that an electric brake is used as the inertial mass. //////////////////////////////, M kr. And M kr.e. 77 / Fig M kr.p /