Compression vibration molding and demolding integrated device for road mixture test piece

Abstract

The utility model discloses a compression vibration forming and demolding integrated device for a road mixture test piece. Comprising a rack, a module mechanism arranged in the middle of the rack and used for containing a test piece, a pressing vibration mechanism arranged on the upper portion of the rack and used for pressing vibration forming of the test piece, and an oil cylinder arranged on the lower portion of the rack and used for pressing and demolding of the test piece. According to the utility model, under the vertical pressure, the excitation action is applied, so that the mixture is compactly arranged, the process of on-site vibration compaction is better simulated, the problems that the pressure head is easy to bounce back and bounce up and the instrument is easy to damage in the vibration compaction process are solved, and when the oil cylinder drives the lower pressure head to move upwards after the compression vibration test of the test piece is finished, the steel mold lantern ring can abut against the steel mold, so that the vibration compaction is more compact. And the lower pressing head pushes out the test piece to realize demolding, and is suitable for vibrating compaction and demolding of asphalt mixture and cement stabilized macadam mixture.

Description

Technical Field

[0001] The utility model belongs to the technical field of compression and vibration molding of mixed material specimens, and in particular relates to an integrated device for compression and vibration molding and demoulding of road mixed material specimens. Background Art

[0002] Asphalt mixtures and cement-stabilized crushed stone mixtures commonly used in pavement need to be produced through indoor tests and undergo a series of physical and mechanical tests. According to the "Testing Procedures for Stabilized Materials with Inorganic Binders for Highway Engineering" (JTG 3441-2024), cement-stabilized crushed stone specimens can be formed by compaction or vibration compaction; while the "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011) stipulates that asphalt mixture specimens can be formed by compaction, wheel rolling or static pressing.

[0003] The existing asphalt pavement construction process includes both the vibration compaction of the vibrating steel wheel roller and the kneading compaction of the tire roller. Therefore, the vibration and kneading effects should be comprehensively considered, the on-site asphalt pavement compaction process should be fitted as much as possible, and the indoor test equipment should be determined. The experimental results can better guide the on-site construction. The existing specimen compression and vibration forming device is prone to rebound during the vibration compaction process under pressure, which can easily cause damage to the instrument, and subsequent work such as demolding is not considered. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an integrated device for compression-vibration molding and demoulding of road mixture specimens in view of the deficiencies in the above-mentioned prior art. The device has a novel and reasonable design. Under vertical pressure, an exciting effect is applied to make the mixture arranged more densely, better simulating the process of on-site vibration compaction, and solving the problems that the pressure head is easy to rebound and the instrument is easy to be damaged during the vibration compaction process. After the specimen compression-vibration test is completed, when the oil cylinder drives the lower pressure head to move upward, the steel mold ring can resist the steel mold, and the lower pressure head pushes the specimen out to realize demoulding. The device is suitable for vibration compaction and demoulding of asphalt mixtures and cement-stabilized gravel mixtures, and is easy to promote and use.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a road mixture test piece pressure vibration molding and demoulding integrated device, characterized by: comprising a frame, a module mechanism arranged in the middle of the frame and used to hold the test piece, a pressure vibration mechanism arranged in the upper part of the frame and used to pressure and vibrate the test piece, and an oil cylinder arranged in the lower part of the frame and used to press and demould the test piece;

[0006] The module assembly mechanism comprises a steel mold base fixed on the frame and having a hollow structure, a steel mold for holding the test piece and a plurality of bolts located on the outside of the steel mold are arranged on the steel mold base, a steel mold collar is coaxially arranged on the top of the steel mold, the steel mold collar is connected to the steel mold base through a plurality of bolts, a lower pad in the cylinder is arranged at the bottom of the steel mold base, an upper pad in the cylinder is arranged at the top of the steel mold base, a lower pressure head is arranged at the top of the oil cylinder, and the upper surface of the lower pressure head contacts the lower surface of the lower pad in the cylinder;

[0007] The pressure-vibration mechanism includes a lifting platform and a cylinder arranged at the bottom of the lifting platform, a pressure rod is arranged at the output end of the cylinder, and the end of the pressure rod away from the cylinder is connected to the vibration platform, two vibration motors are symmetrically arranged on the vibration platform, the vibration platform and the lifting platform are connected by multiple springs, an upper pressure head is arranged at the bottom of the vibration platform, and the lower surface of the upper pressure head contacts the upper surface of the upper pad in the cylinder.

[0008] The above-mentioned road mixture specimen compression vibration molding and demolding integrated device is characterized in that the inner diameter of the steel mold collar and the inner diameter of the steel mold base are equal to the inner diameter of the steel mold, and the outer diameter of the steel mold collar and the outer diameter of the steel mold base are larger than the outer diameter of the steel mold.

[0009] The above-mentioned integrated device for compression-vibration molding and demoulding of road mixture specimens is characterized in that: the top of the bolt is provided with an external thread, and the top of the bolt passes through the steel mold ring and cooperates with the nut.

[0010] The above-mentioned road mixture specimen compression-vibration molding and demoulding integrated device is characterized in that a laser displacement sensor is installed on the lower surface of the vibration platform, and a pressure sensor is installed on the upper surface of the vibration platform.

[0011] The above-mentioned road mixture specimen compression vibration molding and demolding integrated device is characterized in that: a plurality of slide rails are arranged on the inner side wall of the frame, a fixed locking block cooperating with the slide rails is arranged on the slide rails, the outer side surfaces of the plurality of fixed locking blocks are fixedly connected to the lifting platform, a motor is arranged on the top of the frame, and a lifting rod cooperating with the motor transmission is arranged on the top of the lifting platform.

[0012] The beneficial effects of the utility model are that the design is novel and reasonable. Under vertical pressure, the excitation effect is applied to make the mixture arranged more densely, better simulate the on-site vibration compaction process, and solve the problems that the pressure head is easy to rebound and the instrument is easy to be damaged during the vibration compaction process. After the specimen pressure vibration test is completed, when the cylinder drives the lower pressure head to move upward, the steel mold ring can resist the steel mold, and the lower pressure head pushes the specimen out to realize demoulding. It is suitable for vibration compaction and demoulding of asphalt mixtures and cement-stabilized gravel mixtures, and is easy to promote and use.

[0013] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural view of the present utility model.

[0015] Figure 2 This is a schematic view showing the mating relationship between the steel mold, the upper pressing head and the lower pressing head of the present utility model.

[0016] Explanation of reference numerals in the drawings:

[0017] 1 - Frame; 2 - Steel mold base; 3 - Steel mold;

[0018] 4 - Bolt; 5 - Steel mold collar; 6 - Oil cylinder;

[0019] 7 - Slide rail; 8 - Fixed locking block; 9 - Lifting platform;

[0020] 10 - Cylinder; 11 - Pressing rod; 12 - Vibration platform;

[0021] 13 - Spring; 14 - Vibration motor; 15 - Laser displacement sensor;

[0022] 16 - Pressure sensor; 17 - Upper pressing head; 18 - Motor;

[0023] 19 - Lifting rod; 20 - Specimen; 21 - Nut;

[0024] 22 - Upper cushion block inside the cylinder; 23 - Lower cushion block inside the cylinder; 24 - Lower pressing head. Detailed implementation manners

[0025] As Figure 1 and Figure 2 shown, the present utility model includes a frame 1, a module mechanism disposed in the middle of the frame 1 and used for holding the specimen 20, a vibration pressing mechanism disposed at the upper part of the frame 1 and used for vibration pressing and forming the specimen 20, and an oil cylinder 6 disposed at the lower part of the frame 1 and used for pressing and demolding the specimen 20;

[0026] The module mechanism includes a steel mold base 2 fixed on the frame 1 and having a hollow structure. A steel mold 3 for holding the specimen 20 and a plurality of bolts 4 located outside the steel mold 3 are provided on the steel mold base 2. A steel mold collar 5 is coaxially disposed at the top of the steel mold 3. The steel mold collar 5 is connected to the steel mold base 2 through a plurality of bolts 4. A lower cushion block 23 inside the cylinder is provided at the bottom of the steel mold base 2, and an upper cushion block 22 inside the cylinder is provided at the top of the steel mold base 2. A lower pressing head 24 is provided at the top of the oil cylinder 6, and the upper surface of the lower pressing head 24 contacts the lower surface of the lower cushion block 23 inside the cylinder;

[0027] The pressure-vibration mechanism includes a lifting platform 9 and a cylinder 10 arranged at the bottom of the lifting platform 9. A pressure rod 11 is arranged at the output end of the cylinder 10. The end of the pressure rod 11 away from the cylinder 10 is connected to a vibration platform 12. Two vibration motors 14 are symmetrically arranged on the vibration platform 12. The vibration platform 12 and the lifting platform 9 are connected by multiple springs 13. An upper pressure head 17 is arranged at the bottom of the vibration platform 12, and the lower surface of the upper pressure head 17 is in contact with the upper surface of the upper pad 22 in the cylinder.

[0028] It should be noted that under vertical pressure, the excitation effect is applied to make the mixture arranged more densely, better simulate the on-site vibration compaction process, and solve the problem that the pressure head is easy to rebound and the instrument is easy to be damaged during the vibration compaction process. After the specimen compression and vibration test is completed, when the cylinder drives the lower pressure head to move upward, the steel mold ring can resist the steel mold, and the lower pressure head pushes the specimen out to achieve demolding, which is suitable for vibration compaction and demolding of asphalt mixtures and cement-stabilized gravel mixtures.

[0029] In this embodiment, the inner diameter of the steel mold collar 5 and the inner diameter of the steel mold base 2 are equal to the inner diameter of the steel mold 3 , and the outer diameter of the steel mold collar 5 and the outer diameter of the steel mold base 2 are greater than the outer diameter of the steel mold 3 .

[0030] In this embodiment, an external thread is provided on the top of the bolt 4 , and the top of the bolt 4 passes through the steel mold ring 5 and cooperates with the nut 21 .

[0031] In this embodiment, a laser displacement sensor 15 is installed on the lower surface of the vibration platform 12 , and a pressure sensor 16 is installed on the upper surface of the vibration platform 12 .

[0032] In this embodiment, a plurality of slide rails 7 are arranged on the inner wall of the frame 1, and a fixed locking block 8 cooperating with the slide rail 7 is arranged on the slide rail 7. The outer side surfaces of the plurality of fixed locking blocks 8 are fixedly connected to the lifting platform 9. A motor 18 is arranged on the top of the frame 1, and a lifting rod 19 cooperating with the motor 18 is arranged on the top of the lifting platform 9.

[0033] When the utility model is used, the process is as follows:

[0034] ①Install the steel mold containing the mixture.

[0035] The steel mold can be fixed on the frame through the steel mold base, steel mold collar, bolts and nuts. Place the steel mold (including the pad in the cylinder) containing the mixture on the steel mold base. At this time, the steel mold is located in the middle of the two bolts. Then put the steel mold collar (with two holes) through the bolts on the steel mold (the inner diameter of the steel mold collar is the same as the inner diameter of the steel mold, and the outer diameter is larger than the outer diameter of the steel mold). Tighten the nuts and the steel mold is placed.

[0036] ② Adjust the upper pressure head to its initial position.

[0037] The upper pressing head can be adjusted by a motor, a lifting rod, and a slide rail so that the upper pressing head just touches the steel mold (initial position).

[0038] Loosen the fixed locking blocks on both sides of the lifting platform so that the lifting platform can move up and down along the slide rail. Start the motor, and use the lifting rod to slowly lower the lifting platform along the slide rail. Observe the lower pressing head. When the lower pressing head just touches the steel mold (initial position), turn off the motor and tighten the fixed locking blocks. At this time, the upper pressing head is at the initial position.

[0039] Among them, the initial position of the lower pressing head does not need to be adjusted because the lower pressing head passes through the holes in the steel mold base and the frame and is connected to the oil cylinder, and the pressing head itself already touches the cushion block in the steel mold.

[0040] ③ By starting the oil cylinder, the air cylinder, and the vibration motor, the upper and lower pressing heads simultaneously press the test piece, and the vibration motor applies a vibration force to achieve vibration compaction under pressure.

[0041] The air cylinder is fixed above the lifting platform. The vibration platform is fixedly connected to the pressure rod. The air cylinder can drive the pressure rod and the vibration platform to move the upper pressing head downward to compact the test piece.

[0042] Two vibration motors are symmetrically placed on the vibration platform. The vibration motors can generate exciting forces and transmit them to the upper pressing head through the pressure rod for vibration compaction. A spring is provided between the vibration platform and the lifting platform for buffering, which can reduce instrument damage. Since the upper and lower pressing heads apply forces simultaneously, together with the buffer device, the phenomenon of rebound and jumping in traditional vibration compaction is avoided.

[0043] The above can achieve vibration compaction and molding of the test piece under pressure.

[0044] ④ When the test piece reaches the molding height h, stop applying force and end the compaction.

[0045] There is a laser displacement sensor below the vibration platform. The laser displacement sensor can use the plane of the frame below as a reference plane to measure the distance, so as to obtain the displacement of the upper pressing head; a pressure sensor is installed on the vibration platform, which can measure the static pressure and vibration force of the upper pressing head.

[0046] The oil cylinder itself is equipped with pressure and displacement sensors, which can obtain the displacement and pressure of the lower pressing head.

[0047] The specific calculation is as follows:

[0048] The initial height h0 of the test piece;

[0049] The data h1 obtained by the laser displacement sensor at the initial position;

[0050] The real-time data h2 of the laser displacement sensor during the compaction process;

[0051] The real-time data h3 of the oil cylinder during the compaction process;

[0052] During the compaction process, the real-time height h of the test piece is h = h0 - (h1 - h2 + h3);

[0053] When it reaches the required forming height, control to stop applying force.

[0054] ⑤ Lift the lifting platform: Loosen the fixed locking block of the lifting platform, start the motor, and lift the lifting platform.

[0055] ⑥ Demoulding: The steel mold is fixed on the frame. When the oil cylinder drives the lower pressing head to move upward, the steel mold collar can resist the steel mold, and the lower pressing head pushes out the test piece to achieve demoulding.

[0056] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. Road mixture specimen compaction, vibration forming and demoulding integrated device, characterized in that: It includes a frame (1), a module mechanism arranged in the middle of the frame (1) and used for holding a test piece (20), a pressure and vibration mechanism arranged at the upper part of the frame (1) and used for press-vibrating and forming the test piece (20), and an oil cylinder (6) arranged at the lower part of the frame (1) and used for applying pressure to and demolding the test piece (20); The module mechanism includes a steel mold base (2) fixed on the frame (1) and having a hollow structure. A steel mold (3) for holding the test piece (20) and a plurality of bolts (4) located outside the steel mold (3) are arranged on the steel mold base (2). A steel mold collar (5) is coaxially arranged at the top of the steel mold (3). The steel mold collar (5) is connected to the steel mold base (2) through a plurality of bolts (4). A lower cushion block (23) inside the cylinder is arranged at the bottom of the steel mold base (2), and an upper cushion block (22) inside the cylinder is arranged at the top of the steel mold base (2). A lower pressure head (24) is arranged at the top of the oil cylinder (6), and the upper surface of the lower pressure head (24) contacts the lower surface of the lower cushion block (23) inside the cylinder; The pressure and vibration mechanism includes a lifting platform (9) and a cylinder (10) arranged at the bottom of the lifting platform (9). A pressure rod (11) is arranged at the output end of the cylinder (10). One end of the pressure rod (11) far from the cylinder (10) is connected to a vibration platform (12). Two vibration motors (14) are symmetrically arranged on the vibration platform (12). The vibration platform (12) and the lifting platform (9) are connected through a plurality of springs (13). An upper pressure head (17) is arranged at the bottom of the vibration platform (12), and the lower surface of the upper pressure head (17) contacts the upper surface of the upper cushion block (22) inside the cylinder.

2. The integrated device for vibrating and molding and demolding road mixture specimens according to claim 1, wherein: The inner diameter of the steel mold collar (5) and the inner diameter of the steel mold base (2) are both equal to the inner diameter of the steel mold (3), and the outer diameter of the steel mold collar (5) and the outer diameter of the steel mold base (2) are both larger than the outer diameter of the steel mold (3).

3. The integrated device for vibrating and molding and demolding road mixture specimens according to claim 1, characterized in that: External threads are arranged at the top of the bolt (4), and the top of the bolt (4) passes through the steel mold collar (5) and is matched with a nut (21).

4. The road mixture specimen compaction, vibration forming and demoulding integrated device according to claim 1, characterized in that: A laser displacement sensor (15) is installed on the lower surface of the vibration platform (12), and a pressure sensor (16) is installed on the upper surface of the vibration platform (12).

5. The integrated device for vibrating and molding and demolding road mixture specimens according to claim 1, characterized in that: A plurality of slide rails (7) are arranged on the inner side wall of the frame (1). Fixed locking blocks (8) matched with the slide rails (7) are arranged on the slide rails (7). The outer sides of the plurality of fixed locking blocks (8) are fixedly connected to the lifting platform (9). A motor (18) is arranged at the top of the frame (1), and a lifting rod (19) in transmission cooperation with the motor (18) is arranged at the top of the lifting platform (9).

Images