A method for forming an actively adjustable colored water-permeable integral road test piece

Abstract

The present invention discloses an actively adjustable colored permeable integral road test piece forming method, the purpose of which is to solve the problems that when preparing the existing colored permeable integral road test pieces, the vibration forming method is easy to separate the slurry and the stone in the mixture, the mixture is uneven, resulting in the lower layer being compact and permeable, and the upper layer being loose and the strength being reduced; the static pressure forming method has the defects that the pressure is difficult to control and the equipment is difficult to move; and the ramming forming method has the problem that the ramming manual operation force is difficult to control, resulting in the mixture being difficult to be uniformly stressed, the compressive strength being reduced, and it is difficult to meet the quality requirements for inspection. The method comprises the following steps: (1) according to the preparation requirements of the colored permeable integral road test piece, the overflow height of the mixture in the filling unit, the hammer's striking force value, and the hammer's striking times are determined; (2) the test piece mold is set on the holder, and the calibration mold sleeve is set on the test piece mold; and then, the mixture is filled into the calibration mold sleeve.

Description

Technical Field

[0001] The present application relates to the field of building concrete construction, especially the field of urban pavement engineering, and specifically to a method for forming an actively adjustable colored permeable integral road test piece. More specifically, the present application provides an actively adjustable compaction method automatic colored permeable integral road test piece forming device for construction and a method for making the same, which can be used for the preparation of colored permeable integral road test pieces to ensure the accuracy and reliability of the measurement results. Background Art

[0002] Compared with traditional concrete hardened pavement, using colored permeable integral pavement as pavement material is conducive to rainwater infiltration to replenish groundwater, alleviate urban waterlogging, inhibit urban heat island effect, reduce urban air pollution, and promote the improvement of urban ecological environment. Therefore, the application of colored permeable integral pavement is becoming more and more extensive. According to the mandatory provisions of relevant construction technical specifications, each batch of colored permeable integral pavement accompanying materials must be randomly selected at the pouring site of the colored permeable integral pavement, and colored permeable integral pavement test pieces must be made on site, retained and sent to the local testing department for physical property measurement.

[0003] Since the colored permeable integral pavement is a material with continuous porosity made by a special process, there are significant differences in its physical properties from traditional concrete hardened pavement.

[0004] At present, the commonly used molding methods for colored permeable integral pavement test specimens are mainly divided into three methods: vibration molding, static pressure molding and ramming molding. Among them, when the vibration molding method is used to prepare colored permeable integral pavement test specimens, "the slurry that wraps the stones in the upper half of the mixture may separate from the stones, resulting in uneven mixture, dense lower layer, reduced permeability, loose upper layer particles, and reduced strength." (Reference: Song Zhongnan, Shi Yunxing, etc., Permeable Concrete and Its Application Technology [M], China Building Industry Press, 2011.08). When the static pressure molding method is used to prepare colored permeable integral pavement test specimens, "the pressure applied during operation is difficult to control. Excessive pressure will cause damage to the coarse aggregate during the molding process, and too little pressure will not achieve a dense result." (Reference: Song Zhongnan, Shi Yunxing, etc., Permeable Concrete and Its Application Technology [M], China Building Industry Press, 2011.08). In addition, the equipment used for static pressure molding to make colored permeable integral pavement test specimens is heavy and not suitable for moving to the site for use. When preparing colored permeable integral pavement test pieces by the tamping molding method, manual operation is very random, which can easily cause uneven tamping and lead to problems such as low compressive strength. Therefore, the existing colored permeable integral pavement test piece molding methods are difficult to ensure the quality requirements of the molded test pieces for inspection, and this problem has always plagued permeable pavement construction companies.

[0005] Therefore, a new method and / or device is urgently needed to solve the above problems. Summary of the invention

[0006] The invention purpose of this application is to provide an active adjustment type colored permeable integral road test specimen forming method and its device. This application firstly uses the compaction method in the preparation process of colored permeable integral road test specimens, and adopts an active adjustment method to realize the output of the set value of the compaction force, which overcomes the defects of the vibration molding method, the static pressure molding method and the ramming molding method, and can form the mixture used to prepare the colored permeable integral road surface in the test specimen mold at one time, and the prepared test specimen can meet the measurement requirements of the colored permeable integral road surface, and can accurately reflect the actual quality of the colored permeable integral road surface, which has important significance and significant market application value for the promotion of related technologies. Furthermore, the equipment of the present application is compact in size, has good adaptability, has controllable output impact force, has good molding effect, and can effectively make the porosity, water permeability and compressive strength meet the design requirements.

[0007] In order to achieve the above purpose, this application adopts the following technical solutions:

[0008] A method for forming an actively adjustable colored water-permeable integral road test piece comprises the following steps:

[0009] (1) According to the preparation requirements of the colored permeable monolithic pavement test specimen, determine the overflow height of the mixture in the filling unit, the impact strength value of the hammer head, and the number of compaction times of the hammer head;

[0010] (2) The specimen mold is placed on the holder, and then the calibration mold sleeve is placed on the specimen mold; then, the mixture is filled into the calibration mold sleeve, and the height of the mixture is read through the scale mark on the inner wall of the calibration mold sleeve. When the height of the mixture reaches the set overflow height, the filling is completed;

[0011] (3) The control system drives the servo motor through the driver, and the servo motor drives the lead screw nut and the nut support connected to the lead screw nut to accelerate synchronously; when the lead screw nut reaches the set position of the ball screw, the lead screw nut and the nut support connected to the lead screw nut reach the set acceleration; at this time, the control system controls the electromagnetic switch to work, and the electromagnetic switch generates magnetic force, driving the positioning slider and the clamping wheel on the positioning slider to move synchronously along the outer side of the second guide groove, and separates the clamping wheel from the first clamping groove on the nut support, so that the nut support is separated from the support box; then, the lead screw nut continues to move downward under the drive of the ball screw, and the support box drives the hammer head connected to it to compact downward and gradually turn to a stationary state, and realizes the hammer head hitting the mixed material in the specimen mold and the hammer head's striking force reaches the set value;

[0012] (4) After the striking process of step (3) is completed, the servo motor drives the ball screw to move, the electromagnetic switch is turned off, and the clamping wheel moves back along the second guide groove toward the nut support. Under the action of the reset spring, the clamping wheel is clamped in the first clamping groove, so that the nut support and the support box are connected as a whole; then, the servo motor drives the ball screw to rotate in the opposite direction, and the screw nut, the nut support connected to the screw nut, and the support box that remains relatively stationary with the nut support return to the set position; at this time, the servo motor stops working, and a compaction process is completed;

[0013] (5) Repeat the above steps (3) and (4) until the set number of hammer compaction times is reached, completing the forming operation of the specimen.

[0014] In the step 1, for different colored permeable integral pavement test specimens, orthogonal experiments and comparative experimental methods are used to determine the preparation parameters of the specimens, and the preparation parameters include the overflow height of the mixture in the filling unit, the impact strength value of the hammer head, and the number of compaction times of the hammer head.

[0015] In step 3, the height of the mixture in the calibration mold sleeve is measured by a laser rangefinder, and the rotational angular velocity and angular acceleration of the servo motor are adjusted according to the measured height of the mixture to ensure that the striking force of the hammer head reaches the set value each time.

[0016] The impact force of the hammer can be adjusted by adjusting the angular velocity and angular acceleration of the servo motor.

[0017] A colored permeable integral road test piece forming device comprises a supporting unit, an accelerating unit, a compacting unit, a filling unit, and a control system;

[0018] The support unit includes a base plate, a back plate, a fixed support plate, and a support column. The upper and lower ends of the back plate are respectively connected to the fixed support plate and the base plate. The upper and lower ends of the support column are respectively connected to the fixed support plate and the base plate. The fixed support plate, the back plate, the base plate and the support column together constitute a support unit.

[0019] The acceleration unit includes a servo motor connected to the support unit, a driver connected to the servo motor, a ball screw, a guide rail, and a floating lifting block, wherein the output shaft of the servo motor is connected to the ball screw and the servo motor can drive the ball screw to rotate, the guide rail is arranged on the back plate, the floating lifting block is arranged on the guide rail, and the floating lifting block can move relative to the guide rail;

[0020] The compaction unit includes a screw nut, a nut support, and a flexible switch assembly that match the ball screw. The flexible switch assembly includes a support box, a positioning slider, a reset spring, an electromagnetic switch that matches the positioning slider, a clamping wheel, a hammer handle, and a hammer head. The screw nut is arranged on the ball screw and the screw nut can move axially relative to the ball screw. The nut support is respectively connected to the floating lifting block and the screw nut; a first guide groove and a second guide groove that match the nut support are arranged in the support box, and the nut support passes through the first guide groove and the nut support can move relative to the first guide groove; the second guide groove, the positioning slider, the clamping wheel, the reset spring, and the electromagnetic switch are respectively N, N is a natural number and N≥2; the second guide groove is evenly arranged along the axial direction of the nut support;

[0021] The positioning slider, the return spring, and the electromagnetic switch are sequentially arranged in the second guide groove along the center of the support box to the outer side of the support box, and the electromagnetic switch can drive the positioning slider to move in the direction close to the electromagnetic switch after being energized. The return spring is located between the electromagnetic switch and the positioning slider, and the return spring can provide a return force for the positioning slider to move toward the center direction of the support box; the clamping wheel is arranged at one end of the positioning slider close to the center of the support box, and the clamping wheel can rotate relative to the positioning slider; the nut pillar is provided with a first clamping groove matched with the clamping wheel, and the clamping wheel on the positioning slider can be clamped in the first clamping groove so that the nut pillar and the support box remain relatively stationary, and when the clamping wheel is disengaged from the first clamping groove, the support box can maintain relative movement in the vertical direction;

[0022] The two ends of the hammer handle are respectively connected to the supporting box and the hammer head. The hammer head is arranged on the side of the hammer handle facing the filling unit and the hammer head can compact the mixture in the filling unit.

[0023] The loading unit comprises a holder, a specimen mold for preparing the specimen, and a calibration mold sleeve with openings at both ends, wherein the holder is fixedly arranged on the base plate, the specimen mold is arranged on the holder, the calibration mold sleeve is sleeved on the opening of the specimen mold, and the mixture for preparing the specimen can be filled into the specimen mold through the calibration mold sleeve, and the inner wall of the calibration mold sleeve is provided with scale marks, and the overall height of the mixture in the calibration mold sleeve can be read through the scale marks in the calibration mold sleeve;

[0024] The driver and the electromagnetic switch are respectively connected to the control system.

[0025] There are at least two supporting columns, and the supporting columns are evenly distributed on the substrate.

[0026] There are two support columns, and the axial directions of the support columns are parallel to the horizontal plane where the back plate is located. Preferably, there are two support columns and they are arranged parallel to each other.

[0027] The support column and the fixed support plate, the support column and the base plate, the back plate and the fixed support plate, and the back plate and the base plate are connected respectively by bolts or screws.

[0028] The guide rails form a group and are arranged on the back plate in parallel with each other.

[0029] The axial direction of the guide rail is arranged along the vertical direction.

[0030] The guide rod is arranged parallel to the axial direction of the guide rail.

[0031] The guide rod is connected to the fixed support plate.

[0032] The servo motor and the driver are respectively connected to the fixed support plate.

[0033] It also includes a motor protection seat matched with the servo motor, and the motor protection seat is connected to the supporting unit.

[0034] The motor protection seat is connected to the fixed support plate.

[0035] The test piece mold and the holder are detachably connected, and the holder is fixedly arranged on the base plate.

[0036] The lower end of the back plate is connected to the base plate, the upper end of the back plate is connected to the fixed support plate, the upper end of the support column is connected to the fixed support plate, the lower end of the support column is connected to the base plate, and the fixed support plate, back plate, base plate and support column together constitute a support unit.

[0037] The inner cavity of the test piece mold is a rectangular body with one end open;

[0038] The calibration mold sleeve comprises a lower end connection part and an upper end calibration part, the inner cavities of the upper end calibration part and the lower end connection part are respectively rectangular bodies with openings at both ends, the upper end calibration part and the lower end connection part are integrally formed, the inner diameter of the lower end connection part is larger than the inner diameter of the upper end calibration part, and the connection between the upper end calibration part and the lower end connection part forms an annular protrusion matched with the specimen mold, and the calibration mold sleeve can cover the lower end connection part on the outer wall of the specimen mold through the annular protrusion;

[0039] The inner diameter of the upper end marking portion is the same as the inner diameter of the specimen mold, and the scale mark is located on the inner wall of the upper end marking portion.

[0040] The inner wall of the calibration mold sleeve is provided with scale marks with an accuracy of 1 mm.

[0041] The test piece mold is also provided with a plurality of through holes.

[0042] The support unit further comprises a front panel, and the front panel can be mounted on the support unit.

[0043] The nut support includes a horizontal connecting piece and a vertical connecting rod matched with the first guide groove. The vertical connecting rod is perpendicular to the horizontal connecting piece. The horizontal connecting piece is respectively connected to the floating lifting block and the screw nut. The vertical connecting rod is arranged in the first guide groove and the vertical connecting rod can move relative to the first guide groove. The vertical connecting rod and the horizontal connecting piece are integrally formed and the nut support is T-shaped as a whole. The first slot is located on the vertical connecting rod.

[0044] There are two second guide grooves, and the second guide grooves are symmetrically arranged relative to the nut support.

[0045] The two ends of the return spring are respectively connected to the electromagnetic switch and the positioning slide block.

[0046] The return spring is a compression spring.

[0047] The positioning slide block is made of magnetic conductive material.

[0048] The support box and the hammer handle, as well as the hammer handle and the hammer head are connected by threads respectively.

[0049] It also includes an industrial display screen connected to the control system, and the control system is a PLC controller.

[0050] It also includes a support frame connected to the support unit, the control system is arranged on the support frame and the support frame can provide support for the control system.

[0051] Also included is a heat dissipation cover arranged on the control system.

[0052] The utility model also comprises a laser distance meter connected with the control system. The laser distance meter is arranged on the supporting unit and can measure the height of the mixture in the filling unit.

[0053] The laser rangefinder is arranged on a fixed supporting plate.

[0054] At present, most of the existing compaction equipment is based on the principle of free fall to achieve accurate compaction force, that is, when the equipment is working, the compaction hammer realizes the compaction process through free fall. According to Newton's second law: F=G=mg; where F is the compaction force, G is gravity, m is the mass of the compaction hammer, and g is the acceleration of gravity. In this process, the acceleration of gravity remains fixed, and by changing the mass of the compaction hammer, it is relatively easy to obtain accurate compaction force.

[0055] However, this method of achieving strike force has certain shortcomings in actual use, which are mainly reflected in the following three aspects:

[0056] 1) The compaction force output by the existing compaction equipment is discrete and cannot be adjusted continuously;

[0057] 2) The measuring range of existing compaction equipment is limited by the mass of the compaction hammer itself, making it difficult to achieve a smaller compaction force;

[0058] 3) The existing compaction equipment uses manual methods to add weights or gauge blocks, which is not easy to achieve automatic adjustment; the entire specimen preparation process is relatively passive, which brings inconvenience to field construction site operations;

[0059] 4) During specimen preparation, the height of the mixed material will gradually decrease as the compaction process proceeds, which causes the compaction height of the compaction hammer to change. The present application can accurately measure the distance of the repeated process through laser ranging, thereby adjusting the screw speed and the acceleration of the hammer head according to the system calculation.

[0060] To this end, the present application provides an actively adjustable colored permeable integral pavement test piece forming method and device, which adopts an active adjustment method with variable acceleration, and the device includes a support unit, an acceleration unit, a compaction unit, a filling unit, and a control system.

[0061] The assembly process of the device is as follows:

[0062] 1) First place the back panel horizontally on the workbench, then fix the guide rail to the back panel with screws, and then connect the fixed support plate to the back panel with screws;

[0063] 2) Then assemble the servo motor and driver on the fixed support plate, and connect the ball screw to the output shaft of the servo motor; at the same time, assemble the motor guard on the servo motor to protect the servo motor; then, install the floating lifting block on the guide rail;

[0064] 3) Install the flexible switch assembly onto the floating lifting block; the hammer head and the hammer handle are pre-connected and then connected to the supporting box body; then install the base plate, and connect and fix the supporting column and the base plate with screws; then, install and fix the card holder on the base plate; then, fix and assemble the base plate, the supporting column and the back plate with screws;

[0065] 4) Install the power socket and support frame behind the back panel, and fix the PLC controller to the support frame with screws, then cover the PLC controller with a heat sink, and fix the heat sink to the support frame; arrange several I / O interfaces (for controlling the industrial display and PLC controller), and arrange the lines (connecting the servo motor, PLC controller, industrial display, etc.); install the laser rangefinder at the bottom of the top of the support unit; install the front panel, and fix the industrial display in the middle of the front panel; install the hood baffles on both sides to complete the installation of the equipment.

[0066] In this application, a flexible switch component design is adopted. Its working process is as follows: after the electromagnetic switch is powered on, the positioning slider moves outward under the attraction of the electromagnetic switch; after the electromagnetic switch is powered off, the positioning slider moves inward under the action of the reset spring. In this structure, the relative separation and connection of the movement of the nut support and the supporting box are achieved through the separation and connection of the first card slot and the card wheel, thereby achieving the acceleration adjustment and equal acceleration compaction of the hammer head.

[0067] In view of the differences in aggregates, binders and mix ratios used by enterprises that mix colored permeable integral pavement, before formally producing colored permeable integral pavement test specimens, orthogonal experiments or comparative experimental methods must be used to explore the unique characteristics of the colored permeable integral pavement mixture that is suitable for the enterprise and can make the produced colored permeable integral pavement test specimens meet the design physical performance requirements. It includes three parameters: A. The overflow height of the colored permeable integral pavement mixture filled in the filling unit; B. The number of compaction forces in kg; C. The number of compaction times. Under the premise of a certain mixture, the three parameters determined by the above method can be used to prepare test specimens that meet the performance requirements of colored permeable integral pavement.

[0068] Using the above equipment, the steps for specimen preparation are as follows:

[0069] 1) Place the device of this application on a flat workbench and connect it to the power supply;

[0070] 2) According to the model and specifications of the specimen mold for the colored permeable integral pavement to be tested, replace the matching hammer head on the hammer handle of the equipment;

[0071] 3) Vertically fit the calibration mold sleeve on the specimen mold to form a filling assembly; then, load the prepared colored permeable integral pavement mixture into the filling assembly; under the action of the impact force, the height of the mixture in the filling assembly will inevitably settle. In order to ensure the legal size of the specimen, the accurate mixture settlement amount is found out in advance through experiments, and the mixture is filled into the filling assembly according to the measured mixture settlement amount to the corresponding scale value on the inner side of the calibration mold sleeve (i.e., overflow height), and the surface of the mixture in the calibration mold sleeve is kept flat;

[0072] 4) Place the filling assembly with the mixture in step 3) smoothly onto the base plate of the equipment, and fix the filling assembly with the holder on the base plate;

[0073] 5) Input the compaction force in kg and the preferred compaction times into the control system, and then start the equipment;

[0074] 6) The compaction distance of the test block is tested by a laser rangefinder, and the rotational angular velocity and angular acceleration of the servo motor are repeatedly calculated by the control system;

[0075] 7) The servo motor rotates to drive the ball screw, and drives the screw nut on it to move in a straight line. The screw nut is fixedly connected to the nut support. The nut support is connected to the support box through the cooperation of the positioning slider and the clamping wheel. The support box is fixedly connected to the hammer head, so that the hammer head can be driven to move at the same speed and acceleration;

[0076] 8) The hammer head is stably transported to a given position (i.e., the surface of the concrete test block) at a set acceleration. The control system issues a command, the electromagnetic switch is energized, and the flexible switch assembly is opened. The positioning slider drives the clamping wheel to move outward at the same time under the suction force of the electromagnetic switch. At this time, the nut support is separated from the support box, and the nut support no longer acts on the movement of the support box. The nut support continues to move downward, and the hammer head impacts the concrete test block at a set acceleration to complete the compaction process.

[0077] 9) After the impact is over, the electromagnetic switch loses power, and the positioning slider and the clamping wheel thereon move inwards under the action of the reset spring and are clamped in the first clamping groove of the nut support. The nut support moves upward and returns to the initial position quickly under the drive of the ball screw.

[0078] 10) The laser rangefinder calibrates the current compaction distance of the test block, and the control system calculates the next rotational angular velocity and angular acceleration of the servo motor to carry out the next compaction process until the specimen preparation is completed.

[0079] By adopting this application, the automatic adjustment and control of the striking force and the number of compaction times can be realized; at the same time, this application adopts the control of the rotational angular velocity and angular acceleration of the servo motor to realize the change and adjustment of the striking force, which is essentially different from the simple change of the gravity of the hammer head in the prior art. The experimental test results show that the test piece obtained by adopting this application can meet the design requirements of the connected porosity and water permeability coefficient, and the compressive strength can be greatly improved. By adopting this application, the technical defects of the vibration molding method, the static pressure molding method and the ramming molding method are effectively overcome, and the colored permeable integral pavement mixture is molded once, and its equipment is exquisite, portable and easy to carry, which is conducive to the regular relocation of the construction team, and is suitable for the characteristics of the construction enterprise's mobility, easy to move, and on-site use. In summary, this application is simple to use and has a good molding effect. It can make the porosity, water permeability and compressive strength of the colored permeable integral pavement test piece meet the design requirements, meet the measurement requirements of the test piece, and has a high application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Figure 1 This is a schematic diagram of the overall structure of the molding device in Example 1.

[0081] Figure 2 for Figure 1 Side view with front panel installed.

[0082] Figure 3 It is a side view structural schematic diagram of the molding device.

[0083] Figure 4 This is a schematic diagram of the structure of the flexible switch assembly in Example 1.

[0084] Figure 5 This is a schematic diagram of the assembly of the filling components in Example 1.

[0085] Figure 6 A partially enlarged schematic diagram of the inner wall of the calibration mold sleeve.

[0086] Markings in the figure: 1. Motor guard, 2. Back plate, 3. Support column, 4. Guide rail, 5. Test piece mold, 6. Base plate, 7. Card seat, 8. Calibration mold sleeve, 9. Hammer head, 10. Hammer handle, 11. Flexible switch assembly, 12. Screw nut, 13. Ball screw, 14. Servo motor, 15. Driver, 17. Front panel, 20. Heat dissipation cover, 21. Support frame, 22. Control system, 51. Electromagnetic switch, 52. Card wheel, 53. Nut support, 54. Card slider, 55. Support box, 56. Reset spring. DETAILED DESCRIPTION

[0087] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0088] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0089] Example 1

[0090] As shown in the figure, the colored permeable integral road test specimen forming device of this embodiment includes a support unit, an acceleration unit, a compaction unit, a filling unit, and a control system. Among them, the support unit includes a base plate, a back plate, a fixed support plate, and a support column; the lower ends of the back plate and the support column are respectively connected to the base plate, and the upper ends of the back plate and the support column are respectively connected to the fixed support plate, and the fixed support plate, the back plate, the base plate and the support column together constitute a support unit. In this embodiment, there are two support columns, and the axial directions of the support columns are respectively parallel to the horizontal plane where the back plate is located; the support column and the fixed support plate, the support column and the base plate, the back plate and the fixed support plate, and the back plate and the base plate are respectively connected by bolts or screws.

[0091] Among them, the loading unit includes a holder, a specimen mold for preparing the specimen, and a calibration mold sleeve. In this embodiment, the calibration mold sleeve is open at both ends, and the inner cavity of the specimen mold is a rectangular body with one end open. More specifically, the calibration mold sleeve includes a lower end connecting part and an upper end calibration part. The inner cavity of the upper end calibration part and the inner cavity of the lower end connecting part are respectively rectangular bodies with both ends open. The upper end calibration part and the lower end connecting part are integrally formed. The inner diameter of the lower end connecting part is larger than the inner diameter of the upper end calibration part. The connection between the upper end calibration part and the lower end connecting part forms an annular protrusion that matches the specimen mold, and the calibration mold sleeve can cover the lower end connecting part on the outer wall of the specimen mold through the annular protrusion. The inner diameter of the upper end calibration part is the same as the inner diameter of the specimen mold, and the inner wall of the upper end calibration part is provided with a scale mark with an accuracy of 1mm. In this embodiment, the holder is fixedly arranged on the base plate, the specimen mold and the holder are detachably connected, the calibration mold sleeve is sleeved on the opening of the specimen mold, and the specimen mold and the calibration mold sleeve together constitute the specimen mold. In this structure, the mixture used to prepare the specimen can be filled into the specimen mold through the calibration mold sleeve, and the overall height of the mixture in the calibration mold sleeve can be read through the scale mark in the calibration mold sleeve. Preferably, a plurality of through holes are provided on the specimen mold.

[0092] The acceleration unit includes a servo motor, a driver, a ball screw, a guide rail, and a floating lifting block connected to the support unit. Among them, the guide rail is arranged on the back plate, the floating lifting block is arranged on the guide rail, and the floating lifting block can move relative to the guide rail. In this embodiment, there are two guide rails and two floating lifting blocks, and the guide rails are arranged parallel to each other on the back plate. Preferably, the axial direction of the guide rail is arranged along the vertical direction. The servo motor and the driver are respectively arranged on the fixed support plate, and the control system is connected to the servo motor through the driver. The output shaft of the servo motor is connected to the ball screw and the servo motor can drive the ball screw to rotate. Preferably, it also includes a motor guard seat, the motor guard seat is connected to the fixed support plate, and the servo motor is arranged in the motor guard seat. In this structure, the servo motor can drive the ball screw to rotate synchronously, and the servo motor can be adjusted by the driver. The rotational angular velocity and angular acceleration of the servo motor can be adjusted.

[0093] The compaction unit includes a screw nut, a nut support, and a flexible switch assembly that cooperate with the ball screw. Among them, the flexible switch assembly includes a support box, a positioning slider, a reset spring, an electromagnetic switch that cooperates with the positioning slider, a clamping wheel, a hammer handle, and a hammer head. The screw nut is set on the ball screw, and the screw nut can move axially relative to the ball screw. At the same time, the nut support is respectively connected to the floating lifting block and the screw nut; in this structure, the screw nut can provide power for the movement of the nut support in the vertical direction and ensure the axial movement of the nut support along the ball screw.

[0094] The support box is provided with a first guide groove and a second guide groove which match with the nut support. The nut support passes through the first guide groove, and the nut support can move relative to the first guide groove. In this embodiment, the nut support includes a horizontal connecting member and a vertical connecting rod which matches with the first guide groove. The vertical connecting rod is perpendicular to the horizontal connecting member. The horizontal connecting member is respectively connected with the floating lifting block and the lead screw nut. The vertical connecting rod is arranged in the first guide groove, and the vertical connecting rod can move relative to the first guide groove. The vertical connecting rod and the horizontal connecting member are integrally formed, and the nut support is T-shaped as a whole. At the same time, the vertical connecting rod is provided with a first clamping groove which matches with the clamping wheel, and the clamping wheel on the clamping slider can be clamped in the first clamping groove, so that the nut support and the support box remain relatively stationary. When the clamping wheel is disengaged from the first clamping groove, the uniform acceleration compaction motion of the support box along the vertical direction can be gradually converted into a stationary state.

[0095] In this embodiment, there are two second guide grooves, two positioning sliders, two clamping wheels, two return springs, and two electromagnetic switches, and the second guide grooves are symmetrically arranged relative to the axis of the vertical connecting rod. Along the direction from the center of the supporting box to the outside of the supporting box, the positioning slider, the return spring, and the electromagnetic switch are arranged in the second guide groove in sequence, and the two ends of the return spring are respectively connected to the electromagnetic switch and the positioning slider, and the clamping wheel is arranged at one end of the positioning slider close to the center of the supporting box, and the clamping wheel can rotate relative to the positioning slider. Further, the positioning slider is made of magnetic conductive material, and the return spring is a compression spring. In this structure, after the electromagnetic switch is powered on, the electromagnetic switch can provide magnetic force to move the positioning slider in the direction close to the electromagnetic switch, thereby driving the clamping wheel on the positioning slider to separate from the first clamping groove, thereby realizing the separation of the nut support and the flexible switch assembly; the return spring is located between the electromagnetic switch and the positioning slider. When the electromagnetic switch is powered off, the return spring can provide a return force for the positioning slider to move toward the center of the supporting box, thereby causing the positioning slider to drive the clamping wheel thereon to clamp in the first clamping groove, thereby maintaining the relative stillness of the nut support and the flexible switch assembly. In this embodiment, the electromagnetic switch is connected to the control system.

[0096] The two ends of the hammer handle are connected to the support box and the hammer head respectively. The hammer head is arranged on the side of the hammer handle facing the filling unit, and the hammer head can compact the mixture in the filling unit. Furthermore, the support box and the hammer handle, and the hammer handle and the hammer head are respectively connected by threads. Preferably, the support unit also includes a front panel, and the front panel can be mounted on the support unit.

[0097] Furthermore, it also includes an industrial display screen connected to the control system, a support frame connected to the support unit, and a heat dissipation cover arranged on the control system. The control system adopts a PLC controller, the control system is arranged on the support frame, and the heat dissipation cover is arranged on the support frame. Preferably, it also includes a laser rangefinder, which is arranged on the support unit, the laser rangefinder is connected to the control system, and the laser rangefinder can measure the height of the mixture in the filling unit. Furthermore, the laser rangefinder is arranged on the fixed support plate.

[0098] In view of the differences in aggregates, binders and mix ratios used by enterprises that mix colored permeable integral pavement, before formally producing colored permeable integral pavement test specimens, it is necessary to use orthogonal experiments or comparative experimental methods to explore parameters that are suitable for the unique characteristics of the corresponding colored permeable integral pavement mixture and can make the produced colored permeable integral pavement test specimens meet the design physical performance requirements. The parameters mainly include: A. The overflow height of the colored permeable integral pavement filled in the calibration mold sleeve; B. The number of compaction forces in kg; C. The number of compaction times. Under the determined parameters, a standard colored permeable integral pavement test specimen can be prepared at low cost.

[0099] The equipment of this embodiment is used to prepare a colored water-permeable integral road test piece, and the operation is as follows.

[0100] (1) According to the preparation requirements of the colored permeable monolithic pavement test specimen, determine the overflow height of the mixture in the filling unit, the impact strength value of the hammer head, and the number of compaction times of the hammer head.

[0101] (2) Place the specimen mold on the holder, and then place the calibration mold sleeve on the specimen mold. Then, fill the calibration mold sleeve with the mixture, and read the height of the mixture through the scale mark on the inner wall of the calibration mold sleeve. When the height of the mixture reaches the set overflow height, the filling is completed.

[0102] (3) The control system drives the servo motor through the driver, and the servo motor drives the screw nut and the nut support connected to the screw nut to accelerate synchronously. When the screw nut reaches the set position of the ball screw, the screw nut and the nut support connected to the screw nut reach the set acceleration; at this time, the control system controls the electromagnetic switch to work, and the electromagnetic switch generates magnetic force, driving the positioning slider and the clamping wheel on the positioning slider to move synchronously along the outer side of the second guide groove, and separates the clamping wheel from the first clamping groove on the nut support, so that the nut support is separated from the support box. Then, the screw nut continues to move downward under the drive of the ball screw, and the support box drives the hammer head connected to it to gradually turn from the compaction movement to the static state, so that the hammer head hits the mixed material in the specimen mold and the hammer head's impact force reaches the set value.

[0103] (4) After the striking process of step (3) is completed, the servo motor drives the ball screw to move, the electromagnetic switch is turned off, and the clamping wheel moves back along the second guide groove toward the nut support. Under the action of the reset spring, the clamping wheel is clamped in the first clamping groove, so that the nut support and the support box are connected as a whole. Then, the servo motor drives the ball screw to rotate in the opposite direction, and the screw nut, the nut support connected to the screw nut, and the support box that remains relatively still with the nut support return to the set position. At this time, the servo motor stops working, and a compaction process is completed.

[0104] (5) Repeat the above steps (3) and (4) until the set number of hammer compaction times is reached, completing the forming operation of the specimen.

[0105] Preferably, in step 3, the height of the mixture in the calibration mold sleeve is calibrated by a laser rangefinder, and the rotational angular velocity and angular acceleration of the servo motor are adjusted according to the measured height of the mixture to ensure that the striking force of the hammer head reaches the set value each time.

[0106] When preparing the test piece, when the lead screw nut reaches the set position of the ball screw, adjust the rotational angular velocity of the servo motor and the number of strikes of the hammer head to prepare a colored water-permeable integral road test piece that meets the requirements. Preferably, when the equipment is working, the laser rangefinder measures the height of the mixture, and adjusts the rotational angular velocity and angular acceleration of the servo motor through the control system; when the hammer head reaches the surface of the mixture, the electromagnetic switch works to separate the hammer head from the nut support to complete the compaction operation. In this way, it can be ensured that the impact force on the surface of the mixture is the same each time; at the same time, by controlling the number of compactions, the successful preparation of the colored water-permeable integral road test piece is guaranteed. Preferably, the present application realizes the adjustment of the vertical motion acceleration of the hammer head (compacting unit) by adjusting the rotational angular velocity and angular acceleration of the servo motor, thereby obtaining the required impact force.

[0107] Based on the active adjustment principle of variable acceleration, this application can successfully prepare colored permeable integral pavement test specimens. The connected porosity and water permeability coefficient of the prepared specimens meet the design requirements, and the compressive strength can be greatly improved. This application has important application value for the determination of the performance of colored permeable integral pavement, can meet the application needs of the majority of colored permeable integral pavement construction companies, and is worthy of large-scale promotion and application.

[0108] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A method for forming an actively adjustable colored water-permeable integral road test piece, characterized in that: The molding device used in the molding method includes a supporting unit, an accelerating unit, a compacting unit, a filling unit, and a control system; The support unit includes a base plate, a back plate, a fixed support plate, and a support column. The upper and lower ends of the back plate are respectively connected to the fixed support plate and the base plate. The upper and lower ends of the support column are respectively connected to the fixed support plate and the base plate. The fixed support plate, the back plate, the base plate and the support column together constitute a support unit. The acceleration unit includes a servo motor connected to the support unit, a driver connected to the servo motor, a ball screw, a guide rail, and a floating lifting block, wherein the output shaft of the servo motor is connected to the ball screw and the servo motor can drive the ball screw to rotate, the guide rail is arranged on the back plate, the floating lifting block is arranged on the guide rail, and the floating lifting block can move relative to the guide rail; The compaction unit includes a screw nut, a nut support, and a flexible switch assembly that match the ball screw. The flexible switch assembly includes a support box, a positioning slider, a reset spring, an electromagnetic switch that matches the positioning slider, a clamping wheel, a hammer handle, and a hammer head. The screw nut is arranged on the ball screw and the screw nut can move axially relative to the ball screw. The nut support is respectively connected to the floating lifting block and the screw nut; a first guide groove and a second guide groove that match the nut support are arranged in the support box, and the nut support passes through the first guide groove and the nut support can move relative to the first guide groove; the second guide groove, the positioning slider, the clamping wheel, the reset spring, and the electromagnetic switch are respectively N, N is a natural number and N≥2; the second guide groove is evenly arranged along the axial direction of the nut support; The positioning slider, the return spring, and the electromagnetic switch are sequentially arranged in the second guide groove along the center of the support box to the outer side of the support box, and the electromagnetic switch can drive the positioning slider to move in the direction close to the electromagnetic switch after being energized. The return spring is located between the electromagnetic switch and the positioning slider, and the return spring can provide a return force for the positioning slider to move toward the center direction of the support box; the clamping wheel is arranged at one end of the positioning slider close to the center of the support box, and the clamping wheel can rotate relative to the positioning slider; the nut pillar is provided with a first clamping groove matched with the clamping wheel, and the clamping wheel on the positioning slider can be clamped in the first clamping groove so that the nut pillar and the support box remain relatively stationary, and when the clamping wheel is disengaged from the first clamping groove, the support box can make relative movement in the vertical direction; The two ends of the hammer handle are respectively connected to the supporting box and the hammer head. The hammer head is arranged on the side of the hammer handle facing the filling unit and can compact the mixture in the filling unit. The loading unit comprises a holder, a specimen mold for preparing the specimen, and a calibration mold sleeve with openings at both ends, wherein the holder is fixedly arranged on the base plate, the specimen mold is arranged on the holder, the calibration mold sleeve is sleeved on the opening of the specimen mold, and the mixture for preparing the specimen can be filled into the specimen mold through the calibration mold sleeve, and the inner wall of the calibration mold sleeve is provided with scale marks, and the overall height of the mixture in the calibration mold sleeve can be read through the scale marks in the calibration mold sleeve; The driver and electromagnetic switch are respectively connected to the control system; It also includes a laser distance meter connected to the control system, wherein the laser distance meter is arranged on the support unit and can measure the height of the mixture in the filling unit; The molding method comprises the following steps: (1) According to the preparation requirements of the colored permeable monolithic pavement test specimen, determine the overflow height of the mixture in the filling unit, the impact strength value of the hammer head, and the number of compaction times of the hammer head; (2) The specimen mold is placed on the holder, and then the calibration mold sleeve is placed on the specimen mold; then, the mixture is filled into the calibration mold sleeve, and the height of the mixture is read through the scale mark on the inner wall of the calibration mold sleeve. When the height of the mixture reaches the set overflow height, the filling is completed; (3) The control system drives the servo motor through the driver, and the servo motor drives the lead screw nut and the nut support connected to the lead screw nut to accelerate synchronously; when the lead screw nut reaches the set position of the ball screw, the lead screw nut and the nut support connected to the lead screw nut reach the set acceleration; at this time, the control system controls the electromagnetic switch to work, and the electromagnetic switch generates magnetic force, driving the positioning slider and the clamping wheel on the positioning slider to move synchronously along the outer side of the second guide groove, and separates the clamping wheel from the first clamping groove on the nut support, so that the nut support is separated from the support box; then, the lead screw nut continues to move downward under the drive of the ball screw, and the support box drives the hammer head connected to it to compact downward and gradually turn to a stationary state, and realizes the hammer head hitting the mixed material in the specimen mold and the hammer head's striking force reaches the set value; (4) After the striking process of step (3) is completed, the servo motor drives the ball screw to move, the electromagnetic switch is turned off, and the clamping wheel moves back along the second guide groove toward the nut support. Under the action of the reset spring, the clamping wheel is clamped in the first clamping groove, so that the nut support and the support box are connected as a whole; then, the servo motor drives the ball screw to rotate in the opposite direction, and the screw nut, the nut support connected to the screw nut, and the support box that remains relatively stationary with the nut support return to the set position; at this time, the servo motor stops working, and a compaction process is completed; (5) Repeat the above steps (3) and (4) until the set number of hammer compaction times is reached, completing the forming operation of the specimen.

2. The method according to claim 1, characterized in that In the step 1, for different colored permeable integral pavement test specimens, orthogonal experiments and comparative experimental methods are used to determine the preparation parameters of the specimens, and the preparation parameters include the overflow height of the mixture in the filling unit, the impact strength value of the hammer head, and the number of compaction times of the hammer head.

3. The method according to claim 1, characterized in that In step 3, the height of the mixture in the calibration mold sleeve is measured by a laser rangefinder, and the rotational angular velocity and angular acceleration of the servo motor are adjusted according to the measured height of the mixture to ensure that the striking force of the hammer head reaches the set value each time.

4. The method according to any one of claims 1 to 3, characterized in that The impact force of the hammer can be adjusted by adjusting the angular velocity and angular acceleration of the servo motor.

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