RU173579U1 - DEVICE FOR TESTING FOR RUTGING OF ROAD COMPOSITE MIXTURES - Google Patents

Abstract

The utility model relates to a technique for testing new composite mixtures. The device comprises a thermostatically controlled chamber, a force generating unit for the test specimen with a rubberized wheel fixed in the holder, a temperature regulator and a gauge of depth of the formed gauge that can be moved along horizontal guide rods by means of an electric carriage drive to the control panel. A device for imitating an inclined section of the roadbed from the test composite mixture is introduced into the inventive device, which is made in the form of a longitudinal plate placed on the carriage, directly under the test specimen, elongated along the front wall of the thermostated chamber and fixed on one end side parallel to the side walls of the thermostated chamber, articulated pair. On the other opposite loose working side of the longitudinal plate is a rack. On top of the latter, an inclined section is formed, which is located under the edge of the working side of the plate and is made gradually decreasing towards the central part of the plate. The opposite end of the gear rack is made protruding from under the working side of the longitudinal plate and is in contact with the gear wheel, which is mounted on the shaft of the stepper motor. The latter is displayed on the control panel and placed on the carriage. The gear rack and the inclined section are oriented along the front wall of the thermostatic chamber and the longitudinal plate. Effect: improving the accuracy of measurements. 2 ill.

Description

The utility model relates to techniques for testing new composite mixtures, in particular to devices for testing the rutting of road composite mixtures, and can be used in the field of road construction based on them.

There are various designs of domestic devices that allow you to simulate, mainly in laboratory conditions, the process of rutting to study the various compositions of composite mixtures for the purpose of their evaluation, described in the following patent documents:

- copyright certificate SU No. 220604 "Stand for testing pavements, earthworks or artificial structures",

- RU patent for the invention No. 2134738 "Device for dynamic testing of pavement",

- RU patent for the invention No. 2167974 "Installation for testing airfield and road surfaces",

- RU patent for utility model No. 96657 "Test complex for the study of the physico-mechanical characteristics of road surfaces (options)."

Also known is a device for determining the rutting of coatings by rolling a loaded wheel, described in the patent of the Russian Federation for the invention RU No. 2554289. It contains a test heat chamber with a sample table placed on it, on which the mold with the test sample is mounted, a test wheel reciprocating, a wheel drive, a wheel loading system, and a control system. The drive and the wheel loading system are a pendulum-lever mechanism, in which an additional movable link is inserted, providing a straight-line horizontal movement of the wheel.

Also known is a device for testing test samples for rutting [US patent for the invention of US No. 5659140]. It contains a heat chamber with a tray for placing and securing the test sample, a force generating unit containing a wheel fixed in the holder and a load bearing element in the form of plates. The tray is placed on rails with the possibility of reciprocating motion. The heat chamber is equipped with temperature controls. On its front panel there is a window for viewing the internal space.

The closest analogue to the claimed utility model is the technical solution described in the patent of the Russian Federation for utility model RU No. 154142. The device comprises a movable carriage located in a sealed housing, mounted on horizontal guide rods, a sample impact unit with a rubber wheel mounted on a lever having a pivot joint at one end and a load acting on the wheel on the other side, as well as a carriage drive mechanism, heating element and measuring equipment. The heating element includes not only an electric heating unit, but also a fan located inside a sealed thermostatic housing. The lever of the impact unit on the test sample is rigidly fixed to the chamber wall from the side of the swivel joint. The inner surface of the housing is covered with thermally insulating material. The sample impact unit is located above the movable carriage with the test sample.

The disadvantage of all known analogues, including the closest, is the lack of reliability and accuracy of measurements with a variety of obstacles and heterogeneities in the road surface - lifts, ledges, inclines, etc.

The objective of the claimed utility model is to increase the accuracy of measurements when modeling the process of rutting on inclined sections of the roadway.

The essence of the proposed solution lies in the fact that in the device for testing for rutting of road composite mixtures, comprising a thermostatic chamber having two side, rear and front walls, one of which is made with the possibility of visual control of the test; inside the thermostatically controlled chamber there is an assembly for creating a force on the test specimen having a rubberized wheel fixed in the holder; displayed on the control panel temperature controller and depth gauge formed gauge; made with the possibility of movement along horizontal guide rods by means of a drive with an electric motor, a carriage with a structurally designated place for fixing the test sample, a knot for simulating an inclined section of the roadway from the test composite mixture was introduced in the form of a longitudinal plate placed on the carriage under the test sample elongated along the front wall of the thermostated chamber and fixed on one end side parallel to the side walls of the thermostated chamber, articulated a swarm, and on the other opposite loose working side of the longitudinal plate there is a toothed rack, over which an inclined section is formed, located under the edge of the working side of the plate, made smoothly decreasing towards the central part of the plate; the opposite end of the gear rack is made protruding from under the working side of the longitudinal plate and is in contact with the gear wheel mounted on the shaft of the stepper motor displayed on the control panel and placed on the carriage outside the place for fixing the test sample, while the gear rack and the inclined section are oriented along the front wall of the thermostatic chamber and the longitudinal plate.

The technical result of the claimed utility model is to improve the accuracy of measurements achieved by structural changes of the claimed device for the study of the roadway from composite mixtures with the resulting inhomogeneities in the form of sections with protrusions, inclinations and rises.

It is thanks to the totality of the necessary details and their thoughtful interaction that the site for simulating an inclined section of the roadway is made in an original way, with the optimally proposed amount of funds. The inventive device increases the reliability of the results and, thereby, improves the accuracy of measuring the depth of rutting.

The constructive novelty of the proposed solution is not limited to the list of newly introduced structural elements: a longitudinal plate, a gear rack with an inclined section, a gear wheel, a stepper motor, etc., but is also characterized by their relative position, structural relationship with each other (see patent description and formula )

The claimed technical solution is illustrated using FIG. 12.

In FIG. 1 schematically shows the inventive device for testing rutting road composite mixtures, FIG. 2 - in the process of simulating the lifting section of the roadway, in which positions 1-17 indicate:

1 - thermostatic chamber,

2 - guide rods,

3 - carriage

4 - drive

5 - electric motor

6 - test sample,

7 - node create effort

8 - rubberized wheel,

9 - holder

10 is a longitudinal plate

11 - articulated pair,

12 - gear rack

13 - gear

14 - stepper motor,

15 - remote control

16 - temperature controller,

17 - gauge depth gauge.

A device for testing rutting of road composite mixtures includes a thermostatically controlled chamber 1 having two lateral, rear and front walls with a deposited layer of heat-insulating material. At least one of the walls, for example the front, is made with a transparent window for the possibility of visual control of the test. Inside the thermostatically controlled chamber 1, a carriage 3 is mounted on horizontal guide rods 2, which is driven by a drive 4 with an electric motor 5 located outside the thermostatically controlled chamber 1. The carriage 3 has a structurally designated place on top for fixing the test sample 6, for example, in the form of a bathtub, collars or other clamps, depending on the shape and condition of the test sample 6. The inventive device has a node creating a force 7 on the test sample 6, which includes a rubberized wheel 8, mounted in a metal holder 9.

A new element in the claimed device for the possibility of studying the pavement with the simulation of ascent and descent is the site of imitation of the inclined section of the roadway and the details and elements of its components highlighted in bold below, as well as their relationships. The inclined section simulation unit is placed on the carriage 3 and contains a metal longitudinal plate 10 extended along the front wall of the thermostated chamber 1 and placed directly under the test sample 6. The longitudinal plate 10 is fixed on one of its end faces parallel to the side walls of the thermostated chamber 1, by a hinged pair 11 . On the other opposite working side of the longitudinal plate 10, the edge is not fixed. A gear rack 12 is placed from this edge, under the longitudinal plate 10. An inclined section is formed over one end of the gear rack 12 located below the edge of the working side of the longitudinal plate 10, which is made smoothly decreasing toward its central part. The gear rack 12 and the inclined section are oriented along the front wall of the thermostatic chamber 1 and the longitudinal plate 10. The opposite end of the gear rack 12, which is free from the inclined section, is made protruding from the working side of the longitudinal plate 10 with the possibility of contact with the gear 13 mounted on the shaft of the stepper motor 14. The latter is placed on the carriage 3 outside the place for fixing the test sample 6 and is connected to the control panel 15 located outside the thermostatically controlled chamber 1.

The inventive device is equipped with a temperature controller 16 and a gauge 17 of the gauge located inside the thermostatically controlled chamber 1 and displayed on the control panel 15, which is located outside the thermostated chamber 1.

The device operates as follows.

In a thermostatically controlled chamber 1, a pre-prepared sample from the road composite mixture is placed directly on the carriage 3. According to the signals received from the control panel 15 to the drive 4 with the electric motor 5, the latter provides reciprocating movement of the carriage 3 with the test sample 6 fixed to it. In this case, the rubberized wheel 8, rotating around its axis and being in constant contact with the surface of the test sample 6, causes it to deform in the form of a track, the depth of which is proportional to the vertical force created by the force generating unit 7, and is measured by a gauge of track depth 17. Simulation of an inclined section of the roadway It is achieved by lifting from the loose side of the working longitudinal plate 10, carried out by moving the gear rack 15 and its inclined section towards the central part of the longitudinal plate 13. In turn, the movement of the gear rack 12 is provided by counterclockwise rotation of the gear wheel mounted on the shaft of the stepper motor 14. 13, which is meshed with the gear rack 12. The lowering of the loose edge of the working side of the longitudinal plate 10 is provided by moving the gear rack 12 in the direction distance from the center of the longitudinal plate 10 and clockwise rotation of the gear wheel 13 mounted on the shaft of the stepper motor 14. Before starting the test, the following characteristics are set by the operator using the control panel 4: the number of reciprocating movements of the carriage 3, the amount of lifting in the vertical direction of the loose edge of the working the sides of the longitudinal plate 13, the temperature inside the thermostatic chamber 1. The value of the vertical force is carried out by manually adjusting the force generating unit 10. After Using the control panel 15, the operator initiates the “Start” command using the control panel 15, during which the control panel 15 generates the necessary control signals to the device’s actuators: to the temperature controller 16, to drive 4 with electric motor 5 and step motor 14, and also receives signals from the gauge of the depth of gauge 17. The termination of the tests is carried out either automatically after practicing a given cycle, or manually by the operator at any time, if the need arose. By adjusting the angle of inclination of the longitudinal plate 10, conditions are created that are close to the actual operating conditions of the road composite mixture and the pavement based on it, having lifting sections and lowering sections in the direction of vehicle movement.

The inventive device is implemented in the form of a prototype and is being tested in the departments of enterprises of the city of Saratov for the production and testing of road composite mixtures.

Claims (1)

A device for testing rutting of road composite mixtures, including a thermostatic chamber having two side, rear and front walls, one of which is made with the possibility of visual control of the test; inside the thermostatically controlled chamber there is an assembly for creating a force on the test specimen having a rubberized wheel fixed in the holder; displayed on the control panel temperature controller and depth gauge formed gauge; made with the possibility of movement along horizontal guide rods by means of a drive with an electric motor, a carriage with a structurally designated place for fixing the test specimen, characterized in that a knot for simulating the inclined section of the roadway from the test composite mixture is introduced in the form of a longitudinal plate placed on the carriage under the test specimen, elongated along the front wall of the thermostatic chamber and fixed on one end side parallel to the side walls of the thermostat a gear box, a hinged pair, and on the other opposite loose working side of the longitudinal plate there is a gear rack, over which an inclined section is formed, located under the edge of the working side of the plate, made smoothly decreasing towards the central part of the plate; the opposite end of the gear rack is made protruding from under the working side of the longitudinal plate and is in contact with the gear wheel mounted on the shaft of the stepper motor displayed on the control panel and placed on the carriage outside the place for fixing the test sample, while the gear rack and the inclined section are oriented along the front wall of the thermostatic chamber and the longitudinal plate.

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