CN101587037B - Ejection mechanism of asphalt mixture rotary compactors - Google Patents

Abstract

The invention relates to a ejection mechanism of asphalt mixture rotary compactors, which is characterized in that, the ejection mechanism includes a mold comprising longitudinal central axes and cylindrical through hole; a mold top located and clamped on top of the base frame, an upper section stretching into inner holes of the mold, base of the mold is disposed on lower section of inner holes ofthe mold, the materials to be compressed are sealed in the inner holes of the mold by mold top and mold base. Compressing heas locates lower of the inner holes of the mold, and is connected with the compactors in axial direction.

Description

A demoulding mechanism of asphalt mixture rotary compactor

technical field

The invention relates to a demoulding mechanism of a rotary compactor for pressing hot asphalt mixture (HMA) into a standard test piece sample for analysis.

Background technique

Using Superpave technology to replace Marshall asphalt mixture design method is an inevitable trend in the development of highway traffic construction. my country has applied Superpave technology to build a large number of test sections and physical projects on expressways in many areas, and has formed a rapid development situation. In the application of Superpave technology to asphalt mixture pavement design, the compaction equipment used to prepare asphalt mixture analysis samples is completely different from the Marshall method. This compaction equipment produces axial compaction of asphalt mixture samples. At the same time, it also produces rotational shear compaction in the circumferential direction of the sample, forming a kneading effect, which is closer to the force of the actual road surface, and is also a core technology of Superpave technology. Such compaction equipment is known as a gyratory compactor.

It can be seen from the above that the gyratory compactor is a high-tech key test and detection equipment, which is used to prepare the analysis specimens of hot mix asphalt mixture and is an important part of Superpave technology. The promotion and application of Superpave technology cannot be discussed without a rotary compactor. The current rotary compactor does not have an automatic demoulding mechanism. All test pieces must be removed after compaction and then manually or mechanically assisted. very inconvenient

Contents of the invention

The technical problem to be solved by the present invention is to provide another demoulding mechanism of a rotary compactor capable of automatic demoulding.

The technical solution adopted by the present invention to solve the technical problem is: a demoulding mechanism for an asphalt mixture rotary compactor, characterized in that: the demoulding mechanism includes a mold with a longitudinal central axis and a cylindrical through hole ;Position and clamp the top of the mold on the top of the base frame and extend into the upper part of the inner hole of the mold. The mold chassis is placed at the lower part of the inner hole of the mold and is positioned and clamped on the bottom plate of the swing frame. The compacted material is pressed by the mold top and the mold chassis It is closed in the inner hole of the mold; the pressure head is located at the lower part of the inner hole of the mold, the pressure head is located at the lower part of the mold chassis, and the pressure head is connected with the axial compaction mechanism.

By adopting the technical scheme, automatic demoulding can be realized. When the rotary compaction test reaches the specified number of rotations or the specified height of the material sample, the driving motor of the axial compaction and demoulding system stops, the positioning fixture of the mold top is loosened, the mold top is removed, and the axial compaction and stripping are started. The drive motor of the mold system makes the compression shaft continue to move axially, pushes the material sample test piece out of the top surface of the base frame 5, the drive motor stops, the material sample test piece is demolded, and the material sample test piece is taken away from the compactor, so that The drive motor of the axial compaction and demoulding system reverses, the pressure head of the axial compaction and demoulding system returns to the initial position, the drive motor stops, and the test ends.

Further, the axial compaction mechanism is limited, and it is characterized in that: the connection relationship of the axial compaction mechanism is: the drive motor is connected to the gear transmission device, the gear transmission device is connected to the belt transmission device, and the belt transmission device is connected to the ball screw , The ball screw is connected to the compression shaft, and the end of the compression shaft is provided with a pressure head, which pushes the mold chassis to apply axial compression force to the compacted material.

Furthermore, the sensor system is limited, and it is characterized in that: the axial compaction device includes a pressure sensor for measuring the compaction force, and the control system uses the measurement signal of the pressure sensor to control the rotation of the drive motor to keep the compaction force stable .

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Accompanying drawing is the structural representation of the present invention.

Detailed ways

As shown in Figure 1, the mold top 9 is inserted into the mold 1 through the hole at the top of the base frame 5, and the mold top 9 is positioned and clamped by the positioning fixture 10 mounted on the top of the base frame. Consists of mold top 9, mold 1, mold chassis 2, pressure head 18, compression shaft 17, ball screw 19 and nut 20, rolling bearing 21, reaction force plate 22, pressure sensor 23, lower guide column installation pulley 24, gear transmission Installation pulley 25, rolling bearing 26, belt transmission 27, gear transmission 28, driving motor 29, slide plate assembly 30, guide column 31, upper guide column installation pulley 32, guide sleeve 33 and base frame 5 etc. parts are formed. The material sample is sealed in the inner hole of the mold 1 by the mold top 9 and the mold chassis 2 . The positioning fixture (4) positions and clamps the mold (1) on the swing frame bottom plate (3-2). The upper and lower guide column mounting plates are connected to the base frame through bolts. Guide sleeve 33 is packed in the endoporus of upper guide column installation pulley 32, and is connected with upper guide column installation pulley 32 with bolt. The upper end of the compression shaft 17 is connected with the pressure head 18, and the lower end is connected with the ball screw nut and the slide plate assembly 30 with a connecting bolt, and can slide in the inner hole of the guide sleeve 33. The pressure sensor 23 is connected with the lower guide post installation pulley 24 by bolts. The connecting screw rod 34 passes through the through holes of the reaction force plate 22, the lower guide column installation pulley 24, and the gear transmission installation pulley 25, and utilizes the nut 35 to hang the gear transmission installation pulley 25 on the reaction force plate 22. Utilize connecting bolt that gear transmission 28 is installed on the gear transmission installation pulley 25. Between the gear transmission 28 and the ball screw is a belt transmission 27 .

The rotation of the driving motor 29 makes the ball screw 19 rotate through the transmission of the gear transmission 28 and the belt transmission 27, and the nut 20 on the ball screw pushes the slide assembly 30 and the compression shaft 17 to move axially, and the compression shaft pushes the pressure head 18. The indenter pushes the mold chassis 2 to axially compact the material sample enclosed between the mold chassis 2 and the mold top 9 . The magnitude of the axial compaction force is measured by the pressure sensor 23, and the control circuit uses the measurement signal of the pressure sensor 23 to control the driving motor 29, so as to maintain a stable axial compaction force for the material sample during the compaction process. The guide column 31 and the guide sleeve 33 have a guiding effect on the axial movement of the compression shaft 17, and the axial movement of the compression shaft 17 can also be driven by hydraulic or pneumatic means. As shown in the figure, there is a ball hinge spring structure inside the pressure head 18, so that the upper end surface of the pressure head can adapt to the circular yaw movement of the mould. The axial compaction system of a rotary compactor rotates while producing axial compaction of a material sample. The yaw system of the compactor is in a deflected state, which produces a circular deflection motion. This combination of axial compaction motion and circular deflection motion truly simulates the rolling action of vehicle tires and other compaction equipment on road materials, effectively simulating The actual stress of the pavement material is known, and the test data is true and reliable, which provides a reliable experimental basis for the research, design and engineering construction of the pavement subject.

When the rotary compaction test reaches the specified number of revolutions or the specified height of the material sample, the deflection system is changed from the deflection state to the zero state through the microcomputer automatic control system, and the rotary compactor performs end surface leveling on the material sample specimen. Then the driving motor of the axial compaction and demoulding system stops, the positioning fixture of the mold top is loosened, the mold top is taken away, the driving motor of the axial compaction and demoulding system is started, the compression shaft continues to move axially, and the material sample The test piece is pushed out of the top surface of the base frame 5, the driving motor is stopped, the material sample sample is demoulded, the material sample test piece is taken from the compactor, the driving motor of the axial compaction and demoulding system is reversed, and the axial compression The pressure head 18 of the solid and demoulding system gets back to the initial position, the driving motor 29 stops, and the test ends.

The above embodiments only illustrate the specific application of the present invention, and cannot be interpreted as limiting the protection scope of the present invention. As long as the technical scheme of the present invention is adopted, or only conventional changes or deformations that can be made by those of ordinary skill in the art, all Fall into the protection scope of the present invention.

Claims (2)

1. the mould emptier of an asphalt mixture rotary compactors, it is characterized in that: described mould emptier comprises a mould (1) with longitudinal center's axis and cylindrical hole; The mould that the location is clamped in pedestal (5) top pushes up the top that the mould endoporus is stretched in (9); Mould chassis (2) places the bottom of mould endoporus and is positioned and is clamped on the pendulum frame bottom plate (3-2), is compacted material and is enclosed in the mould endoporus by mould top (9) and mould chassis (2); Pressure head (18) is positioned at mould endoporus bottom; Pressure head (18) coupling shaft is to system for compacting; The annexation of described axial compaction mechanism is: drive motor (29) connection gear gearing (28), cogwheel gearing (28) connect belt transmission (27); Belt transmission (27) connects ball-screw (19), and ball-screw (19) connects compressional axis (17), compressional axis (17) end is provided with pressure head (18), and pressure head (18) promotes mould chassis (2) and is applied to axial compaction power on the material that is compacted.

2. the mould emptier of mixture rotary compactors as claimed in claim 1 is characterized in that: described pressure head (18) also available hydraulic or pneumatic mode drives.

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