SU1259117A1 - Device for monitoring tyre pressure - Google Patents

Abstract

The invention relates to an instrumentation technique for diagnosing the technical condition of vehicles on a wheeled vehicle. To improve measurement accuracy and labor productivity by reducing the duration of control, a displacement sensor was introduced into the device, executed as a slider 33 with a spring-loaded bar and a contact flag that interacts with a contactless limit switch, which ensures precise cut-off of a given distance at S (L s .

Description

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any number of measurements. An additional limit switch 27 includes a measurement system for the force-measuring sensor and an electromagnet 41 power supply circuit. On the side surface of the collar 15 is a lever 38 pivotally attached, having a tooth with a bevel at one end for fixing the slide 33 relative to the collar 15 as the fluid flows through the discharge piping. Two shoulders drawstring, state I

The present invention relates to an instrumentation technique for diagnosing the technical condition of vehicles on a pneumatic wheel drive and can be used to determine the pressure value in tires of any type of transport without opening the pneumatic valves.

The aim of the invention is to improve measurement accuracy and labor productivity by reducing the duration of the control.

FIG. 1 shows a device, a general view, (since the left part of the device along the axis of the machine repeats the right without a control panel, it is not shown); in fig. 2 - the right part of the device, top view; in fig. 3 - measuring platform with the cover removed, side view; figure 4 - the same; view from above; in fig. 5 is a section A-A in FIG. 3; in fig. 6 - section BB on the fit. 3; FIG. 7 is a section B-B in FIG. four; in fig. 8 - section GG in FIG. 4i figure 9 - kinematic gheme measuring platform

The device contains measuring platforms 1 and 2 of identical design for controlling pressure in the front and exterior dual and internal tires of vehicle wheels, a rack 3 of the control panel with hydraulic equipment, a head 4 of the control panel with electric devices and signal devices, power cylinders 5 for internal tires and 6 for front and outer tires, pressure pipe 7, electrical wires 8. Measuring platform 17

The shaft of the shaft with brackets 21 and 22, in one of which (22), the stop 24 with the spring 25 is inserted into the stepped hole, contacts the end face of the cylinder under the action of the reactive force of the cylinder with pressure switch 27 and transfers the measured force to the force measuring device. body sensors. The fastening of the power cylinder to the base is made in the form of a swinging suspension. 9 il.

Ma 1 consists of a base 9, to which the front channel 10 with a window 11 and the rear channel 12 are welded, a cap 13 is installed above, the sides are

Kryshiki 14 are fixed. The power cylinder 6 is clamped in clamps 15 and 16, hingedly connected to the pendants 17, which are also hingedly mounted to the uprights 18, rigidly fixed on

basis 9.

From the end surface of the power cylinder 6, two supports 19 with sliding bearings are attached to the base 9, in which a double arm is installed, consisting of a shaft 20 with brackets 21 and 22 welded to it. The bracket 21 has a spherical pin 23, and in the bracket 22 there is a stepped hole in which an emphasis 24 with a spring 25 is inserted, and a pole 26 with a limit switch 27 is fastened to it. On the base 9- under the anvil 24 a force-measuring sensor 28 of any type (strain gauge, magnetic, pneumatic, etc.) is fixed . The power cylinder 6 has a rod 29 with a tip 30 that secures to the rod 29 a bar 31 with a fixed guide 32,

having a cross section of a complex geometric shape and entering a hole in clamps 15. A guide slide 32 is fitted with a slide 33, into which the pressure bar 34 is inserted, pressed by a calibrated spring 35 using a pressure screw 36, and its contact flag is screwed to the bottom 37. On the side surface of the yoke 15 is pivotally fixed a lever 38 having

3

from one end, a tooth with an external bevel and pressed to the slider 33 by means of a flat spring 39, and from the other end - a groove in which a string 40 is inserted, connected to the core of the electromagnet 41, fixed on the plate 42, which is bolted to the clamps 15 and 16. On the plate 42, in front of the collar 15, under the guide 32, there is a threaded protrusion 43, which includes a screw regulator 44 of the stroke with a pad 45 on which a contactless switch 46 is fixed. On the opposite side of the threaded protrusion 43 on the plate 42 is mounted limit switch 47 stroke, contact uyuschy the strip 31 in position when the stem 29 is fully volts. chickpeas in cylinder 6.

The device works as follows.

The machine is mounted by the wheels to be monitored in the space bounded by the front channels 10 of the measuring platforms 1 and 2. The pressure of the front and outer twin wheels is measured by measuring platform 1, and the internal wheels are measured by measuring platform 2, which is structurally identical to measuring platform 1.

The measurement process is as follows.

Depending on the tire size, a regulated distance L is set between the contact flag 37 and the proximity switch 46, with the help of a screw course regulator 44 which, rotating relative to the threaded lug 43, moves the pad 45 with the contactless end switch 46 attached to it From the head 4 of the control panel a command is issued to turn on the electric circuits of control, measurement and operation of the hydraulic equipment mounted in the rack 3 of the console. management The fluid through the pressure pipelines 7 begins to flow into the cavity of the cylinders 6 and under pressure the rod 29 begins to move forward together with the tip 30, the bar 31 and the guide 32, while the slider 33 remains stationary relative to the collar 15, holding it with a tooth of the lever 38, pressed flat spring 39.

1174.

At the moment of contact of the tip 30 of the machine under test, the cylinder 6 under the action of reactive force moves backward and due to its hinged suspension; On the bottom 17 of the cylinder 9, the end of the cylinder 6 rests on the spherical point 23 of the two shoulders backstage, which rotates in the supports 19, overcomes the force of the spring 25 and stops 24 on one side against the limit switch 27, and on the other on the load cell 28. Limit switch 27 includes a measurement system for the force-measuring sensor 28 and the power supply circuit of the electromagnet 41, which by its own power is not 40, and it turns the lever 38 and releases the slider 33, which due to the friction created by the planed 34 preloaded calibrated spring 35 to the flat surface of the guide 32, moves together with the rod 29. Together with the slider 33, the contact 37 is rigidly connected to it. As the rod 29 moves forward, its tip 30 is pressed into the test tire and transmits to the cylinder body 6, and it is, accordingly, on the force sensor 28, the resistance force generated by the air pressure inside the tire. A force sensor 28, through a measurement system, registers this force on a signal device mounted on the head 4 of the control panel.

The movement of the rod 29 forwards and, accordingly, the measurement of the tire resistance force, proportional to the air pressure inside it, occurs until the contact flag enters the gap of the contactless limit switch 45, after which its control circuit is activated and the movement of the rod 29 is reversed , along with it, in the opposite direction, the guide 32 moves with the slider 33. When tip 30, moving back, comes out of contact with the test tire, the spring 25 removes the stop 24 from the force interaction with the force measuring m sensor 28 and the limit switch 27, which disables the electromagnet 41 and the measurement system.

On the signal device installed in the head 4 of the control panel, and the measurement system of the force-measuring sensor 28, which has a memory

The indicators CBOBTBaNfH, provide indications corresponding to the measurement of the maximum resistance of the tire for pressing the tip 30 into it at the moment the contact flag 37 enters the slot of the contactless switch 46 and activates its control circuit. The movement of the slider 33 in the opposite direction is set until it rests on the collar 15, while the lever 38, having missed the slider when moving back, fixes it in this position, the guide 32 moving back to the moment encounters of the strap 32 with the limit switch 47, which, under its influence, turns off the bench's hydraulic equipment.

From the signal device of the control panel head 4, NIN displays are shown, which characterize the air pressure in the test tire. The validity of these measurements is due to the fact that when the device is calibrated, the ratio of air pressure inside the tire is determined by the resistance force of the tire side surface to force the tip 30 into it to a predetermined depth L, determined by the distance between the contact flag 37 and the proximity switch 46, the pre-regulation for each tire size, and the criterion for estimating the value of this distance is the minimum value of the influence of the stiffness of rubber on generated by the air pressure inside. By sending a command to the head 4 of the control panel, the readings from the signal device and the memory of the measuring system are reset, and the device is ready for the following measurements.

The hinge suspension of the power cylinder 6 on the tambourine 17 relative to the base 9 with the transfer of the measured force to the force-measuring sensor 28 through the swinging arm mounted in the bearing support 19, allows to obtain the measurement accuracy corresponding to the sensor used. The higher the accuracy of the sensor, the higher the accuracy of the measurements, while measuring directly the reaction of the tire to pressing the tip 30 into it, completely -. makes it necessary to measure and sub 17. 6

keep strictly constant pressure inside the power cylinder 6.

Using the slider 33 as a reading device, mounted on the guide 32 and pressed to it through the bar 34 by the spring 35, which interacts with its contact flag 37 with a contactless limit switch 46, allows to increase the measurement accuracy due to a very accurate cut-off of a given distance L at any the number of measurements due to the high speed of operation of the limit switch 27, the electromagnet 41 and the contactless switch 46, which determine the beginning and end of the movement of the tip 30 into the measured bus, to In addition, it increases operational safety, since it eliminates the presence of moving electrical conductors during motion control, and operational reliability, since the use of standard electrical devices commercially produced by industry, such as force-measuring sensors, limit switches and an electromagnet, guarantees regulated durability and high operational reliability.

The use of the screw 4 stroke regulator for operative and high-precision installation of the regulated distance L makes the device universal, allowing it to be used in virtually every type of pneumatic tire control and makes it completely safe, since the regulated movement L of the tip 30 inside the tire is established knowingly excluding the possibility of a puncture of the tire and causing an emergency o6cTaHOBKyj and reversing the movement completely eliminates the possibility of device failure if accidentally exiting or entering his vehicle, since rod 29 is always in a retracted inside the cylinder 6 state.

Ф орм ул and and з is found and

A device for monitoring air pressure in tires, containing measurement platforms with a base on which a power cylinder mounted in hrmutah is installed with a rod interacting with the measured tire

712591

a reference electromagnet of reference, two limit switches and a force sensor, which interacts with one of the limit switches, characterized in that, in order to improve measurement accuracy and productivity by reducing the duration of control, a plate rigidly connected to the clamps is inserted into the clamp displacements, tO full in the form of an additional limit switch mounted on a slide rail with a spring-loaded bar and a pin flag, an optional limit switch installed (5

178

NIN on the plate, latches in the form of a lever, hinged on the side surface of one of the collars, and a two-arm rocker, hinged on the base, in one of the arms of which a hole is made with a spring-loaded seal installed in it simultaneously in contact with an additional limit switch and sensor forces located on the base, while the mount of the power cylinder with clamps to the base of the measuring platform is retracted in the form of a swinging suspension.

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Editor I. Shulla

Compiled by V. Kazakov

Tehred And Popovich Proofreader L. Patay

Order 5112/39 Circulation 778 Subscription

VNIshta State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., A

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Claims (1)

Claim A device for monitoring air pressure in tires, containing measuring platforms with a base on which a power cylinder is mounted in the clamps with a rod interacting with the measured tire. reference start electromagnet, two limit switches and a force sensor interacting with one of the limit switches, characterized in that, in order to improve measurement accuracy and labor productivity by reducing the monitoring time, a plate is inserted into it, rigidly connected to clamps, a displacement sensor made in the form of a slider mounted on the guide with a spring-loaded bar and a contact flag, an additional limit switch mounted with the possibility of moving-> 5 on the plate, loki in the form of a lever pivotally mounted on the side surface of one of the clamps, and a two-arm link, pivotally mounted on the base, in one of the shoulders of which a hole is made with a spring-loaded stop installed in it, simultaneously contacting with an additional limit switch Yu and a force sensor, located on the base, while fixing the power cylinder with clamps to the base of the measuring platform is made in the form of a swinging suspension. TTGPTGP Figure 1 Ph. 5 in-in FIG. 6 Fig.9