CN213275210U

CN213275210U - Shearing compaction instrument

Info

Publication number: CN213275210U
Application number: CN202022059024.8U
Authority: CN
Inventors: 董文春; 石亮; 张伦
Original assignee: Beijing Aerospace Xintong Technology Co ltd
Current assignee: Beijing Aerospace Aerospace Experimental Equipment Technology Co.,Ltd.
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-05-25
Anticipated expiration: 2030-09-18

Abstract

The utility model discloses a cut compaction appearance, cut compaction appearance includes: mould, frame shear mechanism and compacting mechanism: the die is used for being placed on the rack to contain materials to be compacted, wherein the side plates on two opposite sides of the die are arranged to be capable of swinging back and forth; the shearing mechanism is arranged to drive the side plates on the two sides of the mold to swing back and forth so as to apply shearing force to the material in the mold; the compaction mechanism is arranged to apply pressure to the material within the mould from above or below the mould. The utility model provides a shear compaction appearance can simulate the real process of rolling in road surface better for the later stage by the testing result of compaction test piece comparatively good.

Description

Shearing compaction instrument

Technical Field

The utility model relates to a check out test set technical field specifically, relates to a cut compaction appearance.

Background

In the construction of the highway, the asphalt pavement has the characteristics of short construction period, no joint, low noise, easy maintenance and the like, so that the utilization rate of the constructed and newly-built highway reaches over 90 percent. Although the asphalt pavement is designed and constructed according to the specifications, the early-stage pavement damage phenomenon happens occasionally. The Marshall design method is the most commonly used asphalt mixture design method in China, various indexes of the asphalt mixture obtained by the traditional Marshall compaction method cannot truly simulate various performances of a real pavement in a use state, and the Marshall design method has the following problems:

(1) the traditional indoor forming mode is not in accordance with the working condition of on-site rolling

As is known, the indoor test can simulate the actual construction conditions on site to the maximum extent, so that the test result can effectively represent the road performance. However, the traditional indoor forming method adopts a Marshall compaction method to form a test piece, and determines the optimal oilstone ratio through the volume index and the mechanical index of the test piece by a static pressure method, which is completely inconsistent with the working condition of a large-tonnage compacting machine adopted in the actual pavement compacting process.

(2) The actual compaction effect is different from the compaction standard

Compaction is a key link in the construction and production construction of the asphalt pavement, and poor compaction results in large pavement void ratio and low strength, which causes the asphalt pavement to have water damage, rutting and other damage phenomena, and is related to the pavement performance of the asphalt pavement. Therefore, the research on the compaction characteristics of the mixture is one of the most important tasks for improving the quality of the asphalt pavement.

(3) Quality control indicators not matching road performance requirements

The Marshall design method calculates the volume index and the mechanical index of the test piece by the static pressure method through the Marshall test, thereby searching the best state in each index and determining the best oilstone ratio. Only static mechanical indexes are emphasized in the design process, so that the stability and flow value indexes meet the requirements, but the asphalt pavement is damaged early or the service life of the design is difficult to guarantee.

In conclusion, the prior research on the asphalt pavement is concentrated on macroscopic research, and the research on the asphalt mixture from a single aspect is not enough to explain a series of problems of the current asphalt pavement. In addition, the forming control standard of the indoor test is still the previous compaction standard, and the performance verification is to test the conventional mechanical index according to the original traditional method, which is obviously not in accordance with the performance requirement on the current highway.

Therefore, a new device is needed to be provided to simulate the rolling condition of the asphalt mixture construction site more truly and well solve the consistency between the indoor forming mode and the rolling under the site working condition.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a cut compaction appearance can simulate the real process of rolling in road surface better, and moreover, the material inner structure after the compaction shaping is more even, and the material performance testing result in later stage is also better, more is close actual road.

In order to achieve the above object, the utility model provides a shearing compaction instrument, shearing compaction instrument includes: mould, frame shear mechanism and compacting mechanism:

the die is used for being placed on the rack to contain materials to be compacted, wherein the side plates on two opposite sides of the die are arranged to be capable of swinging back and forth;

the shearing mechanism is arranged to drive the side plates on the two sides of the mold to swing back and forth so as to apply shearing force to the material in the mold;

the compaction mechanism is arranged to apply pressure to the material within the mould from above or below the mould.

Preferably, the shearing mechanism comprises a driving mechanism, a driving shaft driven to rotate by the driving mechanism and an eccentric shaft eccentrically connected to the driving shaft;

the connecting frame is connected to the two side plates of the mould, one end of the connecting frame is rotatably connected to the eccentric shaft, and the other end of the connecting frame is rotatably connected to the connecting rod;

when the driving shaft drives the eccentric shaft to rotate, the eccentric shaft drives the connecting rod to swing, so that the connecting rod drives the two side plates connected with the connecting frame to swing.

Preferably, the eccentric shaft is provided with an adjustable eccentricity.

Preferably, a slide rail for guiding the movement of the connecting frame is arranged between the connecting frame and the rack.

Preferably, the bottom of the mold is provided with a bottom plate for supporting the material and a top plate positioned above the material, and the bottom plate can move up and down relative to the side plates;

the compaction mechanism is configured to apply an upward pushing force to the floor to compact the material.

Preferably, the compacting mechanism comprises a connecting plate and at least one air cylinder, and the connecting plate is mounted on a telescopic rod of the air cylinder so as to push the bottom plate through the connecting plate.

Preferably, the top plate of the mold is arranged to be movable up and down relative to the side plates;

the shearing and compacting instrument further comprises a pushing mechanism, wherein the pushing mechanism is arranged to push the top plate downwards to push the materials in the die to the bottom.

Preferably, a bearing frame is arranged on the machine frame, the bearing frame is provided with a first position and a second position for bearing the molds, and the molds can move back and forth between the first position and the second position;

wherein the mold is loaded to the carrier in the first position and the shear mechanism and the compaction mechanism exert forces on the material within the mold after moving from the first position to the second position;

wherein the shear compactor further comprises a positioning mechanism for positioning the mold in the second position.

Preferably, the shear compactor further comprises a discharge mechanism;

the material of the mould is compacted and then moved from the second position to the first position, the discharge mechanism being arranged to apply an upward pushing force to the upwardly and downwardly movable floor of the mould in the first position to push the compacted material within the mould upwardly out of the mould.

Preferably, the shear compactor further comprises a pressure sensor for detecting the force applied by the shear mechanism to the side plates; and/or the presence of a gas in the gas,

the shear compactor further comprising a height sensor for detecting the height at which material within the mould is advanced; and/or the presence of a gas in the gas,

the shear compactor further includes a counter for counting a number of oscillations of the side plates of the mold.

The utility model provides a technical scheme makes two lateral wall swing back and forth of mould through applying horizontal direction's thrust and pulling force in material (bituminous mixture) forming process to material in the mould is out of shape under the effect of shearing force, applies the load to the material in the vertical direction simultaneously, and the power of vertical direction keeps unchangeable always in the compaction process to the material. Under the combined action of the shearing force and the vertical force, the materials in the die can be regularly arranged, and the internal stress is uniform, so that the density distribution is uniform. This compaction forming process can simulate the real process of rolling in road surface betterly for the test result of the test piece that is compacted in later stage is comparatively good, more is close actual road.

Drawings

FIG. 1 is a schematic view of a shear compactor according to an embodiment of the present invention (with the mold in a first position in the carrier);

FIG. 2 is a schematic view of the shear compactor shown in FIG. 1 from another perspective;

FIG. 3 is a schematic view of the shear compactor in operation (with the mold in the second position on the carriage)

FIG. 4 is a schematic structural view of the shear compactor after being taken out of the frame;

FIG. 5 is a schematic structural view of a mold;

FIG. 6 is a schematic view of the connection of the connecting rod and the connecting frame;

fig. 7 is a schematic view of a compactor mechanism.

Description of the reference numerals

1-a frame; 2-a bearing frame; 3-molding; 301-side panels; 302-an end plate; 303-a connecting portion; 304-a support bar; 4-a positioning mechanism; 5, a motor; 6-a speed reducer; 7-mounting a block; 8-eccentric shaft; 9-a connecting rod; 10-a pressure sensor; 11-a connecting frame; 111-a receiving tank; 12-a slide rail; 13-a cylinder; 14-a material pushing cylinder; 15-a discharge cylinder; 16-limit switches; 17-a counter; 18-connecting plate.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may also be otherwise oriented, such as by rotation through 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

The utility model provides a shear compaction appearance, as shown in fig. 1-3, shear compaction appearance includes: mould, frame, shearing mechanism and compacting mechanism: wherein,

The utility model provides a shear compaction appearance is fit for being used for carrying out the compaction to bituminous mixture, the situation that rolls of simulation bituminous mixture job site.

The shear compactor enables two side walls of a mold to swing (generally, swing in the horizontal direction) by applying horizontal thrust and tension in the material (asphalt mixture) forming process, so that the material in the mold deforms under the action of shear force, meanwhile, load is applied to the material in the vertical direction, and the vertical force is kept unchanged all the time in the material compacting process. Under the combined action of the shearing force and the vertical force, the materials in the die can be regularly arranged, and the internal stress is uniform, so that the density distribution is uniform. This compaction forming process can simulate the real process of rolling in road surface betterly for the test result of the test piece that is compacted in later stage is comparatively good, more is close actual road.

The following describes the technical solution provided by the present invention in detail according to a specific embodiment with reference to the accompanying drawings.

As shown in fig. 1-3, the shear compactor comprises a frame 1, wherein a bearing frame 2 for bearing a mould 3 is arranged on the frame 1, the bearing frame 2 has a first position for bearing the mould 3 and a second position, and the mould 3 can move back and forth between the first position and the second position;

wherein the mould 3 is loaded to the carrier 2 in the first position and after moving from the first position to the second position the shearing mechanism and the compacting mechanism apply a force to the material in the mould 3 for compacting.

Fig. 1 and 2 show the mould 3 in said first position, and fig. 3 shows the mould 3 in the second position.

In order to keep the mold 3 in the second position when the shearing mechanism and the compacting mechanism exert force on the material in the mold 3, the shearing compactor further comprises a positioning mechanism 4 for positioning the mold 3 in the second position, so that the material compaction molding is facilitated and the noise can be reduced by positioning the mold 3. The positioning mechanism 4 may be any one of various components capable of limiting the movement direction of the mold 3, as long as the mold 3 is moved to the second position and then limits the two ends of the mold 3, which is not described in detail herein.

In this embodiment, a specific structure of the mold 3 is shown in fig. 5, the mold 3 includes side plates 301 located at two opposite sides and end plates 302 located at two opposite ends, wherein the two end plates 302 are supported and fixed by a support rod 304, the two side plates 301 are configured to be capable of swinging back and forth, a connecting portion 303 is disposed at the top of the side plates 301, and the connecting portion 303 is connected to a connecting frame 11 (described in further detail below) that drives the side plates 301 to swing.

In the present embodiment, the shearing mechanism includes a driving mechanism, a driving shaft driven to rotate by the driving mechanism, and an eccentric shaft 8 eccentrically connected to the driving shaft;

the connecting frame 11 is connected with the two side plates 301 of the mould 3, and the connecting rod 9 is rotatably connected with the eccentric shaft 8 at one end and rotatably connected with the connecting frame 11 at the other end, wherein the axis of the connecting rod 9 rotating relative to the connecting frame 11 is vertical to the eccentric shaft 8;

when the driving shaft drives the eccentric shaft 8 to rotate, the eccentric shaft 8 drives the connecting rod 9 to swing, so that the connecting rod 9 drives the two side plates 301 connected with the connecting frame 11 to swing.

More specifically, as shown in fig. 4, the driving mechanism includes a motor 5 and a speed reducer 6 connected to the motor 5, a mounting block 7 is connected to a driving shaft of the speed reducer 6, the eccentric shaft 8 is fixed to the mounting block 7, and an axis of the eccentric shaft 8 is offset from the driving shaft. When the speed reducer 6 drives the driving shaft to rotate, the eccentric shaft 8 on the mounting block 7 is driven to rotate, and the connecting rod 9 connected with the eccentric shaft 8 performs push-pull action, so that the connecting frame 11 connected with the connecting rod 9 is pushed and pulled. As shown in fig. 5 and 6, the connecting frame 11 is provided with two receiving slots 111, each receiving slot 111 receives a connecting portion 303 of the top end of a side plate 301 of the mold 3, and the connecting portion 303 of the top end of the side plate 301 can move into the receiving slot 111 during the process of moving the mold 3 from the first position to the second position of the carrier 2, so that the two side plates 301 swing back and forth when the connecting rod 9 pushes and pulls the connecting frame 11 in a direction perpendicular to the length direction of the receiving slot 111.

Preferably, a slide rail 12 for guiding the movement of the link frame 11 is provided between the link frame 11 and the housing 1. The slide rail 12 may be fixed on the frame 1, and the connecting frame 11 may move along the slide rail 12.

Preferably, the eccentric shaft 8 is set to be adjustable in eccentricity, and by adjusting the eccentricity of the eccentric shaft 8, the degree of the connecting frame 11 driving the side plate 301 of the mold 3 to swing back and forth can be adjusted, so as to adjust the shearing force for shearing the material in the mold 3.

The shear compactor further comprises a pressure sensor 10 for detecting the force applied by the shearing mechanism to the side plates 301, thereby detecting the magnitude of the shearing force applied by the shearing mechanism to the material in the mould 3. Preferably, as shown in fig. 4 and 6, the pressure sensor 10 is disposed on the connecting rod 9, and the pressure sensor 10 can detect the push-pull force transmitted by the connecting rod 9. Of course, it will be understood that the pressure sensor 10 may be disposed at other locations where shear forces are felt, such as between the mounting bracket 11 and the side plate 301.

In addition, in order to realize shearing and compaction of the material, a shearing period of the material can be set, for example, 20 periods of back and forth swing of the side plate of the mold 3 are set, and after the 20 periods are completed, the compaction of the material is completed. To this end, in the present embodiment, the shear compactor further includes a counter 17 for counting the number of times the side plate 301 of the mold 3 swings. As shown in fig. 2, a limit switch 16 is disposed on the frame 1, the swing of the side plate 301 will trigger the limit switch 16, and the counter 17 counts once every time the limit switch is triggered.

In this embodiment, a bottom plate for supporting the material and a top plate located above the material are disposed at the bottom of the mold 3, and the bottom plate can move up and down relative to the side plate 301; the compaction mechanism is configured to apply an upward pushing force to the floor to compact the material.

Preferably, the compacting mechanism comprises a connecting plate 18 and at least one cylinder 13, the connecting plate 18 being mounted on the telescopic rod of the cylinder 13 to push the bottom plate through the connecting plate 18.

As shown in fig. 4 and 7, the compacting mechanism of the present embodiment is provided with two air cylinders 13, and a connecting plate 18 is connected to the telescopic rods of the two air cylinders 13. Preferably, the connecting plate 18 is provided with a roller contacting with the bottom plate of the mold 3, and the connecting plate 18 and the bottom plate of the mold 3 can move flexibly in the horizontal direction by the roller, so that only upward thrust is applied to the bottom plate.

Preferably, the shearing and compacting instrument further comprises a height sensor for detecting the advanced height of the material in the mold and/or a vertical force sensor for detecting the vertical force applied to the material by the compacting mechanism, wherein the height sensor can be arranged on a telescopic rod of the air cylinder 13 or on a bottom plate of the mold 3, and the changed height of the material is detected by detecting the telescopic height of the telescopic rod or the moving height of the bottom plate; the vertical force sensor can be arranged at any position where it can detect the pushing force of said cylinder 13 against the base plate, for example on the telescopic rod or connecting plate 18 of the cylinder 13.

In this embodiment, the top plate of the mold 3 is provided so as to be movable up and down with respect to the side plate 301;

the shearing and compacting instrument further comprises a pushing mechanism, wherein the pushing mechanism is arranged to push the top plate downwards to push the material in the die 3 to the bottom.

As shown in fig. 1-4, the push-pull mechanism includes a pushing cylinder 14, and the telescopic rod of the pushing cylinder 14 pushes the top plate of the mold 3 downwards to push the compacted material to the bottom.

The shearing and compacting instrument further comprises a discharging mechanism; the material of the mould 3 is compacted and then moved from the second position to the first position, the discharge mechanism being arranged to apply an upward pushing force to the upwardly and downwardly movable floor of the mould 3 in the first position to push the compacted material in the mould 3 upwardly out of the mould 3.

Specifically, the discharging mechanism comprises a discharging air cylinder 15, and the discharging air cylinder 15 is arranged below the first position of the bearing frame 2. The material in the mould 3 is compacted by the shearing mechanism and the compacting mechanism at the second position, and after being pushed down to the bottom by the discharging mechanism, the mould 3 is moved from the second position to the first position, as shown in fig. 1, and the bottom plate of the mould 3 can be pushed up from below by the discharging cylinder 15 when the mould 3 is at the first position. Wherein the bottom of the carriage 2 may be provided with an opening so that the telescopic rod of the discharge cylinder 15 passes through the opening to contact the bottom plate of the mould 3.

In this embodiment, the shearing and compacting apparatus further includes a control unit, where the control unit records the shearing force applied by the shearing mechanism to the material, the vertical force applied by the compacting mechanism to the material, and the height change of the material, so as to calculate parameters such as the bulk density, the porosity, and the number of times of shearing and compacting (i.e., the number of times of swinging of the side plate of the mold) at that time, and when the bulk density, the porosity, and the number of times of shearing and compacting (i.e., the number of times of swinging of the side plate of the mold) reach preset values, the control unit may control the shearing mechanism and the compacting mechanism to automatically stop, the material pushing mechanism pushes the material in the mold from top to bottom, and then the mold 3 may be moved out from the second position to the first position, and the mold 3 may be unloaded by the unloading mechanism.

By adopting the shearing and compacting instrument provided by the embodiment, the operation of warming up can be firstly carried out before the shearing and compacting instrument is used, a preset amount of waste asphalt mixture is preheated and put into the mold 3, a preset period is set for compacting, and after the compacting is finished, the waste asphalt mixture is taken out and then a formal test is carried out.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical idea of the utility model within the scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, makes up with any suitable mode including each concrete technical feature. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. A shear compactor, comprising: mould, frame shear mechanism and compacting mechanism:

2. The shear compactor of claim 1, wherein the shear mechanism includes a drive mechanism, a drive shaft driven for rotation by the drive mechanism, and an eccentric shaft eccentrically connected to the drive shaft;

3. The shear compactor according to claim 2, wherein the eccentric shaft is arranged with an adjustable degree of eccentricity.

4. The shear compactor of claim 2, wherein a slide rail is provided between the carriage and the frame to guide movement of the carriage.

5. The shear compactor of claim 1, wherein the bottom of the mold is provided with a bottom plate for holding the material and a top plate above the material, the bottom plate being movable up and down relative to the side plates;

6. The shear compactor of claim 5, wherein the compaction mechanism includes a connecting plate and at least one cylinder, the connecting plate being mounted on a telescoping rod of the cylinder to push the base plate through the connecting plate.

7. The shear compactor of claim 5, wherein the top plate of the mold is arranged to be movable up and down relative to the side plates;

8. A shear compactor according to any one of claims 1-7 wherein a carriage is provided on the frame, the carriage having a first position for carrying the mould and a second position between which the mould can be moved back and forth;

9. The shear compactor of claim 8, further comprising a discharge mechanism;

10. The shear compactor of any one of claims 1-7, further comprising a pressure sensor for detecting the force applied by the shear mechanism to the side plates; and/or the presence of a gas in the gas,