SU1605950A1 - Device for determining draught resistance of mounted agricultural machine - Google Patents

Abstract

Field of the Invention The invention relates to technical devices intended for laboratory field research and testing of agricultural machines and tools. The aim of the invention is to improve the accuracy of the measurement of the lateral and vertical components of the traction resistance of mounted agricultural machines. The device contains two parallel base plates for mounting on a tractor and a suspension of an aggregated agricultural machine. Both plates are connected by tensometric fingers 7, 8, 9, 10. On one of the plates in the longitudinal-vertical plane there are fixed cantilever fingers 11, 12 with radial ball bearings 13 at the ends. On the other plate, two mutually perpendicular grooves 14, 15 are made, in which the outer cages of ball bearings are placed. During operation, the finger 11 registers only the vertical component of the pull resistance and the finger 12 - the lateral component of the drag resistance. The load is taken up accordingly by load cells 16, 17. 2 Il.

Description

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measurements of lateral and vertical components of traction resistance of mounted agricultural machines. The device contains two parallel base plates for mounting on a tractor and suspension of an aggre gated agricultural machine. Both plates are connected by strain gauges 7-10. On one ich plates in the longitudinal-vertical plane are fixed cantilevered tensile fingers 11, 12 s

radial ball bearings 13 at the ends. On the other plate, there are two mutually perpendicular grooves 14, 15, in which the outer cages of ball bearings are placed. During operation, the finger 11 registers only the vertical component of the pull resistance, and the finger 12 - the lateral component of the drag resistance. The load is sensed by load cells 16, 17, 2, or 10, respectively.

The invention relates to technical means intended for laboratory field research and testing of agricultural machines and implements, and it is expedient to use it for acceptance tests of agricultural machinery.

The purpose of the invention is to improve the accuracy of the measurement of the lateral and vertical components of the traction resistance in the longitudinal-vertical plane of mounted agricultural machines.

FIG. 1 shows a side view of the device; in fig. 2 is a section A-A in FIG. one.

The device for determining the traction resistance of mounted agricultural machines is made in the form of a block and contains two parallel base plates 1 and 2, the hanger 3 automatic hitch coupling hanger, brackets 4-6 for mounting the device according to the three-point scheme on the aggregated tractor and tensometric pins 7-12 . On the base plate 1 welded by the seams, the brackets 4-6 and the ends of the strain gauge fingers 7-12 are connected. With the base plate 2 are similarly connected bracket 3 of the automatic coupling and the second ends of the strain gauge fingers 7-K). Plates 1 and 2 with rods of strain gauge fingers 7-10 form a spatial parallelepiped. When the strain gauge fingers 7-10 are deformed in any direction, the base plates 1 and 2 remain parallel. On the plate 1 in the longitudinal-vertical plane there are two cantilever tensile pins 11 and 12, which end with radial ball bearings 13 with a spherical outer ring above the threaded part of the pins. The plate 2 is provided with two mutually perpendicular grooves 14 and 15. The bearing 13 of the strain gauge finger 11 is located in the horizontal groove 14. The spherical holder of the bearing 13 of the strain gauge finger 11 touches the vertical walls of the groove 15.

On the finger rods 7-10 and 11, 12, in the corresponding order, strain gauge resistance sensors 16 and 17 are glued with a longitudinal base of 20 mm with a nominal

200 ohm resistance. The strain gauge sensors 16 on the rod of the finger II are glued in the upper and lower horizontal planes and only vertical deformations are recorded, i.e.

0 /, of the total traction resistance / mounted machine. On the rod of the finger 12, the strain gauge sensors 17 are glued along its sides along the axis and in the vertical plane, which fix only the lateral component of the drag resistance R of the gun. On the rods of the strain gauge fingers 7, 8, 9 and 10, the strain gauge sensors 18 are glued in two mutually perpendicular planes and connected in a corresponding way to the pavement

0 scheme, which completely excludes the influence of lateral R, i and vertical R, which make up the total traction resistance /, as well as from the moments of MG, A f ,,, M ,. Four parallel strainers 7, 8, 9, and 10 are recorded in the pure form of horizontal5 on the component R of the total resistance of the machine. This is the uniqueness of the proposed device, which possesses noise immunity and synthesis of the components of the .v, R, traction resistance R of the gun.

The device works in the following way. When the mounted machine or gun is working through the bracket 3, the automatic hitch of the machine frame hangs out the total resistance of the working bodies, as a rule, directed

5 in space at an angle to the longitudinal-vertical plane, through plate 2 is transmitted to the strain gauge fingers 7-W, and then through plate 1 and the brackets 4-6 to the base tractor through drawbars of the hinged system. Strain gauge sensors 18 on

0 strain gauge fingers 7-10 fix the drag resistance of the gun R in the direction of movement of the agricultural or transport unit. If there is a vertical component. resistance machine R tensometric fingers 7-10

5 and 11 are bent in a longitudinal vertical plane. The force / component, causing additional deformations of the fingers 7, 8 and 9, 10, mutually compensates

In sensors 18 of the measuring bridge, whereas in the strain gauge finger 11, the component sn / leads to deformation of the compression and tension of the fibers and grating of the strain gauge sensors 16, causing imbalance in the bridge circuit of the measuring circuit. The strain gauge sensors 16 fix the vertical component / in its pure form without distortion. If there is a lateral component / ,, (for unbalanced tools, for example, plows with a dumped-bed-surface), a similar pattern occurs in strain gauges 7–10, as in the case of loading by a component of forces, but in this case

wheels of guns or machines. The experimental data obtained allow the correct selection of energy sources. The sticker of the resistance strain gages on the fingers of the proposed device does not require additional devices for balancing bridges. This ensures high availability of the device for operation and multiple repetition of test results.

Claims (1)

Apparatus of the Invention through the bearing 13 of roll 15, the hinged agricultural carrier shifts the cantilever part of the rod of the strain gauge finger 12 to the side, causing deformation of the pasted strain gauge sensors 17. The actual response value of the sensors 17 is transmitted to the measuring circuit of the recording equipment. signals appear that are proportional to the horizontal, vertical, and lateral components of the co20 force containing a support plate with a bracket for a tractor tractor hitch system and an operative plate for an automatic coupling device connected by tensor fingers to the shock gear, characterized in that, in order to improve the accuracy of measuring lateral and vertical components of the drag resistance in the longitudinal direction vertical plane, in the support plate with a bracket grooves arranged mutually first machines, containing a support plate with a bracket for the tractor tractor hitch system and an operatic plate for the automatic coupler, connected tensors They are characterized by the fact that, in order to increase the accuracy of measuring the lateral and vertical components of the drag in the longitudinal-vertical plane, grooves are located in the base plate with a bracket, which are located in reciprocal perresistance of the machine. Calibration with strain gauges - 25 pendicularly in horizontal and vertical fingers 7-12 is carried out on lime-plane planes, and another plate is equipped with methods. An additional console cantilever is attached. The proposed device allows certain tensor fingers, the free ends of the co-channel real drag are equipped with radial ball-bearing pods. machines /, the size of unbalanced bearings. placed in the grooves of the first lateral forces RU, as well as the load on the support-30plity. /four wheels of guns or machines. The experimental data obtained allow the correct selection of energy sources. The sticker of the resistance strain gages on the fingers of the proposed device does not require additional devices for balancing bridges. This ensures high availability of the device for operation and multiple repetition of test results. Apparatus of the Invention containing a support plate with a bracket for a tractor tractor hitch system and an operative plate for an automatic coupling device connected by tensor fingers to the shock gear, characterized in that, in order to improve the accuracy of measuring lateral and vertical components of the drag resistance in the longitudinal direction vertical plane, in the base plate with a bracket grooves arranged mutually perpendicular to the horizontal and vertical 16 one}