Marshall compactor fixing device

Abstract

The utility model relates to bituminous mixture test equipment technical field especially relates to a kind of marshall compaction apparatus fixing device, including two hydraulic telescopic links, wherein, two hydraulic telescopic links are fixed on the test bench of marshall compaction apparatus, and the output end of two hydraulic telescopic links is oppositely arranged;It further includes fixed test mould clamp and thermostat, wherein, one fixed test mould clamp is detachably arranged on the output end of each hydraulic telescopic link;Heating cavity is arranged in the inside of fixed test mould clamp, and silica gel heating sheet and temperature sensor are arranged in heating cavity;Silica gel heating sheet and temperature sensor are connected thermostat by wire.The utility model proposes a kind of marshall compaction apparatus fixing device, which controls silica gel heating sheet to heat test piece by thermostat, is conducive to promoting the forming quality and stability of test piece.

Description

Technical Field

[0001] This utility model relates to the technical field of asphalt mixture testing equipment, and in particular to a Marshall compactor fixing device. Background Technology

[0002] In the Marshall test, asphalt mixtures exhibit specimen displacement during the molding process, necessitating specimen fixation. Utility model publication CN219511970U discloses a device for automatic fixation of a Marshall compactor, which uses a hydraulic telescopic rod to drive a fixing sleeve to fix the test cylinder, thereby securing the specimen inside the cylinder.

[0003] Because asphalt mixtures are temperature-sensitive materials, temperature has a significant impact on the molding quality and stability of their specimens. Therefore, Marshall specimens need to be maintained within a specific temperature range during compaction to ensure their optimal performance. Currently, the preparation of Marshall specimens follows the requirements of the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering," which controls the mold temperature and the mixing temperature of the mixture.

[0004] As described above, the existing Marshall compactor fixing device cannot effectively control the temperature of the specimen during the fixing process, which has an adverse effect on the molding quality and stability of the specimen. Utility Model Content

[0005] In view of this, the present invention proposes a Marshall compactor fixing device, which uses a constant temperature controller to control the temperature of the silicone heating element to heat the specimen, which is beneficial to improving the molding quality and stability of the specimen. This solves the problem that the existing Marshall compactor fixing devices cannot effectively control the temperature of the specimen, which has an adverse effect on the molding quality and stability of the specimen.

[0006] The technical solution of this utility model is implemented as follows: This utility model provides a fixing device for a Marshall compactor, comprising two hydraulic telescopic rods, wherein... The two hydraulic telescopic rods are fixed on the test bench of the Marshall compactor, and the output ends of the two hydraulic telescopic rods are arranged opposite each other; It also includes a fixed mold fixture and a temperature controller, among which, Each of the hydraulic telescopic rods is detachably equipped with a fixed test mold fixture at its output end; The fixed mold fixture has a heating chamber inside, and a silicone heating element and a temperature sensor are installed in the heating chamber. The silicone heating element and the temperature sensor are connected to the thermostat via wires.

[0007] Based on the above technical solutions, preferably, the silicone heating pad is fixedly connected to one side of the heating cavity near the clamping surface of the fixed mold fixture, and the temperature sensor is fixedly connected to the other side.

[0008] Based on the above technical solutions, a preferred option also includes a heat insulation sheet, wherein... The heat insulation sheet is fixed to the inner wall of the heating cavity on the side away from the silicone heating sheet.

[0009] Based on the above technical solution, preferably, the side of the fixed mold fixture is provided with a wire hole, wherein, One end of the wire hole is connected to the heating cavity; One end of the wire passes through the wire hole.

[0010] Based on the above technical solutions, preferably, the clamping surface of the fixed mold fixture is arc-shaped or V-shaped.

[0011] Based on the above technical solution, preferably, the clamping surface of the fixed mold fixture has a plurality of through holes evenly distributed thereon, wherein, The through hole is connected to the heating cavity.

[0012] Based on the above technical solutions, preferably, it also includes copper sheets, wherein, The copper sheet is laid and fixed on the clamping surface of the fixed mold fixture; A mating hole is provided on the copper sheet at the position corresponding to the through hole.

[0013] Based on the above technical solutions, preferably, the side of the fixed mold fixture is provided with a protrusion, and the output end of the hydraulic telescopic rod is provided with an insertion hole, wherein, The protrusion is inserted into the socket.

[0014] Based on the above technical solutions, preferably, the side of the protrusion is provided with an external spline, and the side of the insertion hole is provided with an internal spline, wherein... The external spline engages with the internal spline.

[0015] Based on the above technical solutions, a preferred option also includes hand-tightening screws, wherein... The hand-tightening screw is screwed onto one side of the output end of the hydraulic telescopic rod; One end of the hand-tightening screw extends into the socket to abut against the side end of the protrusion.

[0016] The Marshall compactor fixing device of this utility model has the following advantages over the prior art: (1) By setting up a silicone heating pad and a temperature sensor and connecting them to a constant temperature controller via wires, it is convenient to control the silicone heating pad to heat and control the temperature of the specimen through the constant temperature controller, which is beneficial to improving the molding quality and stability of the specimen.

[0017] (2) By fixing a silicone heating pad to one side of the heating chamber near the clamping surface of the fixed mold fixture, the silicone heating pad is close to the clamping surface, which is conducive to heat transfer and improves the heating effect. At the same time, by setting a heat insulation sheet on the other side of the heating chamber, heat loss is reduced and temperature control is facilitated.

[0018] (3) By setting the clamping surface of the fixed mold fixture to be arc-shaped or V-shaped, and the fixed mold fixture is detachable, it is convenient to be compatible with round or square Marshall molds. At the same time, the V-shaped clamping surface can also be compatible with Marshall molds with different outer diameters, and has good versatility.

[0019] (4) By setting through holes on the clamping surface of the fixed mold fixture, the specimen can be heated.

[0020] (5) By setting copper sheets, the outer surface of the Marshall mold can be prevented from being damaged by the fixed mold fixture, which is beneficial to the protection of the mold. At the same time, the copper sheets are provided with mating holes at the positions corresponding to the through holes, which will not affect the heat transfer and is conducive to the normal heating of the specimen.

[0021] (6) By setting the external spline to mesh with the internal spline, it is beneficial to fix the installation and positioning of the test mold fixture, and it is not easy to deflect or misalign during clamping, which is beneficial to the protection of the Marshall test mold. At the same time, by setting the hand-tightening screw, the fixed test mold fixture is more secure and stable after installation, and there is less chance of deflection or misalignment. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of a Marshall compactor fixing device according to the present invention; Figure 2 A schematic diagram of the internal structure of the fixture for fixing the test mold; Figure 3 A diagram illustrating the significance of the detachable structure for fixing the test mold fixture; In the diagram: 1. Hydraulic telescopic rod; 2. Support rod; 3. Marshall mold; 4. Wire; 5. Heating chamber; 6. Mold fixing fixture; 7. Silicone heating plate; 8. Wire hole; 9. Touch screen control panel; 10. Nut; 11. Temperature sensor; 12. Compactor start switch; 13. Emergency stop switch; 14. Confirmation switch; 15. Display panel; 16. Fixture start switch; 17. Fixture release switch; 18. Heating start switch; 19. Heating pause switch; 20. Setting switch; 21. Touch screen control panel start switch; 22. Thermostat; 23. Copper sheet; 24. Tightening screw; 25. Heat insulation sheet; 26. Through hole; 27. Mating hole; 28. Protrusion; 29. ​​Insertion hole; 30. Column. Detailed Implementation

[0024] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] like Figure 1-3 As shown, the present invention provides a Marshall compaction apparatus fixing device, which includes two hydraulic telescopic rods 1, a fixed test mold clamp 6, and a constant temperature controller 22.

[0026] Two hydraulic telescopic rods 1 are fixed on the test bench of the Marshall compactor, and the output ends of the two hydraulic telescopic rods 1 are arranged opposite each other; a fixed mold fixture 6 is detachably installed on the output end of each hydraulic telescopic rod 1; a heating chamber 5 is provided inside the fixed mold fixture 6, and a silicone heating element 7 and a temperature sensor 11 are provided in the heating chamber 5; the silicone heating element 7 and the temperature sensor 11 are connected to a thermostat 22 through a wire 4.

[0027] During the test, the Marshall mold 3 is secured to the Marshall compactor test bench with nuts, and then the clamping surfaces of the fixed mold fixture 6 are driven by two hydraulic telescopic rods 1 to clamp the Marshall mold 3. After clamping, the silicone heating element 7 is heated by the thermostat 22 to heat the material inside the Marshall mold 3. During the process, the temperature sensor 11 detects the real-time temperature. When the temperature rises to a preset threshold, the silicone heating element 7 stops heating; when the temperature drops back to the preset threshold, the silicone heating element 7 reheats, thus maintaining the temperature of the Marshall mold 3 within a reasonable range, such as a fluctuation of ≤±1.2℃ when set at 150℃. This structure facilitates temperature control of the specimen, which is beneficial for improving the molding quality and stability of the specimen.

[0028] In the above structure, a column 30 is fixedly installed at the bottom of the Marshall compactor test bench by a nut 10 to support the test bench and improve its stability. Specifically, the upper end of the column 30 extends upward through the test bench and is screwed to the nut 10, while the lower end is supported on a base below the test bench. Two support rods 2 are fixed to the top of the test bench, and a hydraulic telescopic rod 1 is fixed to each support rod 2 to improve the stability of the connection between the hydraulic telescopic rod 1 and the test bench.

[0029] In addition, the temperature sensor 11 has a sampling frequency of 10Hz. The data collected by the sensor is converted into a visualized curve (temperature-time curve) by the data collection and processing module, and the real-time temperature is monitored through the time-temperature curve.

[0030] In addition, the Marshall compactor has a control console containing a microcontroller. The thermostat 22 can be any existing thermostat control device, such as the SV-201P-3 thermostat. The thermostat 22 is located on the control console and communicates with the microcontroller. Furthermore, the control console has switches for controlling the start / release of the hydraulic telescopic rod 1, the start / pause of the silicone heating element 7, and the start switch for the touchscreen control panel 9. Specifically, in addition to the clamp start switch 16 and clamp release switch 17, the silicone heating element 7 heating start switch 18 and heating pause switch 19, and the touchscreen control panel start switch 21, the control console also has: Touchscreen control panel 9: Used for human-computer interaction; Compactor start switch 12: Used to turn on the Marshall compactor; Emergency stop switch 13: Used for emergency braking in case of abnormal conditions in the Marshall compactor; Display panel 15: Used to display control parameters, such as the temperature-time curve of temperature sensor 11; Setting switch 20: Used to set the control parameters of the Marshall compactor; Confirmation switch 14; used to confirm the adjusted control parameters of the Marshall compactor.

[0031] In the Marshall compactor fixing device, such as Figure 2 As shown, a silicone heating element 7 is fixedly connected to one side of the heating chamber 5 near the clamping surface of the mold fixture 6, and a temperature sensor 11 is fixedly connected to the other side. This allows the silicone heating element 7 to be close to the clamping surface, which is beneficial for heat transfer and improves the heating effect. Furthermore, a heat insulation sheet 25 is fixed to the inner wall of the heating chamber 5 on the side away from the silicone heating element 7. The heat insulation sheet 25 is a nano-aerogel heat insulation layer with a thickness of 5mm. This heat insulation sheet 25 effectively reduces heat loss, which is beneficial for smooth temperature control.

[0032] like Figure 2As shown, a wire hole 8 is provided on the side of the fixed mold fixture 6, with one end of the wire hole 8 connected to the heating chamber 5; one end of the wire 4 passes through the wire hole 8. Specifically, the wire 4 includes two cables. One cable passes through the wire hole 8 and is connected to the wire of the silicone heating pad 7. The other cable is connected to the wire of the temperature sensor 11. The temperature sensor 11 is installed on the inner wall of the heating chamber 5 at a position 20mm from the bottom, mainly to avoid the impact of compaction vibration on the measurement and to monitor the surface temperature change of the Marshall mold 3 in real time. The collected surface temperature data is fed back through the touch screen control panel 9.

[0033] Combination Figure 3 The clamping surface of the fixed mold fixture 6 is arc-shaped or V-shaped. Figure 1 The clamping surface of the fixed mold fixture 6 shown in the image is arc-shaped, and this shape of the fixed mold fixture 6 is adapted to the cylindrical Marshall mold 3. Figure 3 The clamping surface of the fixed mold fixture 6 shown is V-shaped, which is suitable for cylindrical Marshall molds 3. The detachable design of the fixed mold fixture 6 allows the fixing device to be compatible with both round and square Marshall molds 3. The appropriate shape of the fixed mold fixture 6 can be replaced as needed, demonstrating good versatility.

[0034] In addition, the V-shaped clamping surface is also compatible with Marshall trial molds 3 of different outer diameters, making the fixing device more versatile.

[0035] In the above structure, the side of the fixed mold clamp 6 is provided with a protrusion 28, and the output end of the hydraulic telescopic rod 1 is provided with a socket 29, wherein the protrusion 28 is inserted into the socket 29. Specifically, the side of the protrusion 28 is provided with an external spline, and the side of the socket 29 is provided with an internal spline, wherein the external spline and the internal spline mesh to achieve the insertion and engagement of the protrusion 28 and the socket 29. This structure facilitates the installation and positioning of the fixed mold clamp 6, prevents deflection and misalignment during clamping, and protects the Marshall mold 3.

[0036] Furthermore, a hand-tightening screw 24 is screwed onto one side of the output end of the hydraulic telescopic rod 1; one end of the hand-tightening screw 24 extends into the insertion hole 29 to abut against the side end of the protrusion 28. This structure achieves the connection and fixation between the protrusion 28 and the insertion hole 29, making the installation and fixation of the mold clamp 6 more secure and stable, and preventing the problem of deflection and misalignment.

[0037] When replacing the fixed test mold fixture 6, loosen the hand screw 24, then remove the protrusion 28 from the insertion hole 29, insert the protrusion 28 on the side of the new fixed test mold fixture 6 into the insertion hole 29, and then tighten it with the hand screw 24 to complete the replacement of the fixed test mold fixture 6.

[0038] like Figure 2As shown, the clamping surface of the fixed mold fixture 6 has several through holes 26 evenly distributed, and the through holes 26 communicate with the heating chamber 5. This design allows heat to smoothly contact the Marshall mold 3, which is beneficial for the heating of the specimen.

[0039] Furthermore, a copper sheet 23 is laid and fixed on the clamping surface of the fixed mold fixture 6. The copper sheet 23 has a thickness of 1-3 mm and a thermal conductivity ≥380 W / (m·K). The copper sheet 23 prevents the fixed mold fixture 6 from damaging the outer surface of the Marshall mold 3, thus protecting the mold. In this structure, a mating hole 27 is provided on the copper sheet 23 at the position corresponding to the through hole 26, so that the copper sheet 23 does not affect the heat transfer, which is conducive to the normal heating of the specimen.

[0040] The method of using the Marshall compactor fixing device of this utility model is as follows: Before the test begins, turn on the heating start switch 18 to power on the silicone heating element 7. Adjust the temperature using the touchscreen control panel 9 to ensure the Marshall compactor remains within the optimal temperature range during compaction. Once the required temperature is reached, turn on the compactor start switch 12, place the mixed asphalt mixture into the Marshall mold 3, and secure the mold 3 in the center of the test bench with bolts. Activate the clamp start switch 16, and the hydraulic telescopic rod 1 drives the mold clamp 6 to hold and fix the Marshall mold 3 on both sides. Adjust the number of compactions and the compaction time, and begin compacting the specimen. After compaction, press the clamp release switch 17 to move the mold clamp 6 back to its original position, thus completing the preparation of the Marshall specimen.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A Marshall compactor fixing device, comprising two hydraulic telescopic rods (1), wherein, The two hydraulic telescopic rods (1) are fixed on the test bench of the Marshall compactor, and the output ends of the two hydraulic telescopic rods (1) are arranged opposite each other; Its features include: a fixed mold clamp (6) and a constant temperature controller (22), wherein, Each of the hydraulic telescopic rods (1) is detachably provided with a fixed test mold fixture (6) at its output end; The fixed mold fixture (6) is provided with a heating chamber (5), and a silicone heating pad (7) and a temperature sensor (11) are provided in the heating chamber (5). The silicone heating element (7) and the temperature sensor (11) are connected to the thermostat (22) via wires (4).

2. The Marshall compactor fixing device as described in claim 1, characterized in that: The heating chamber (5) is fixedly connected to the silicone heating pad (7) on one side near the clamping surface of the fixed mold fixture (6), and the temperature sensor (11) is fixedly connected to the other side.

3. The Marshall compactor fixing device as described in claim 2, characterized in that: It also includes heat insulation sheet (25), in which, The heat insulation sheet (25) is fixed on the inner wall of the heating chamber (5) on the side away from the silicone heating sheet (7).

4. The Marshall compactor fixing device as described in claim 1, characterized in that: The side of the fixed mold fixture (6) is provided with a wire hole (8), wherein, One end of the wire hole (8) is connected to the heating cavity (5); One end of the wire (4) passes through the wire hole (8).

5. The Marshall compactor fixing device as described in claim 1, characterized in that: The clamping surface of the fixed mold fixture (6) is arc-shaped or V-shaped.

6. The Marshall compactor fixing device as described in claim 1, characterized in that: The clamping surface of the fixed mold fixture (6) has several through holes (26) evenly distributed, wherein, The through hole (26) is connected to the heating cavity (5).

7. The Marshall compactor fixing device as described in claim 6, characterized in that: It also includes copper sheets (23), among which, The copper sheet (23) is laid and fixed on the clamping surface of the fixed mold fixture (6); A mating hole (27) is provided on the copper sheet (23) at the position corresponding to the through hole (26).

8. The Marshall compactor fixing device as described in claim 1, characterized in that: The fixed mold fixture (6) has a protrusion (28) on its side, and the hydraulic telescopic rod (1) has a socket (29) on its output end. The protrusion (28) is inserted into the socket (29).

9. The Marshall compactor fixing device as described in claim 8, characterized in that: The side of the protrusion (28) is provided with an external spline, and the side of the socket (29) is provided with an internal spline, wherein, The external spline engages with the internal spline.

10. The Marshall compactor fixing device as described in claim 9, characterized in that: It also includes hand-tightened screws (24), among which, The hand-tightening screw (24) is screwed onto one side of the output end of the hydraulic telescopic rod (1); One end of the hand-tightening screw (24) extends into the socket (29) to abut against the side of the protrusion (28).

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