Marshall compaction apparatus

Abstract

A Marshall compaction apparatus, comprising a base (100), a cabinet (200), a mounting assembly (300), a plurality of test mold assemblies (600), and a plurality of compaction assemblies (400), wherein the cabinet (200) is connected to the base (100); the mounting assembly (300) is connected to the top of the cabinet (200); the test mold assemblies (600) are placed on the base (100) and are configured to accommodate a material to be molded; each compaction assembly (400) comprises a guide rod (410) and a compaction head (430), wherein the guide rods (410) are arranged in a vertical direction, a connecting structure (420) is provided at the top of each guide rod (410), and the connecting structures (420) are detachably connected to the mounting assembly (300); and the compaction heads (430) are connected to the bottom of the guide rods (410), and the compaction heads (430) are configured to compact said material. When the type of a test piece needs to be replaced, the compaction assembly (400) can be replaced as a whole, such that the test efficiency is significantly improved, and the situation whereby the apparatus is damaged as a result of the frequent replacement of the compaction head (430) can be avoided.

Description

Marshall compaction apparatus Technical Field

[0001] This invention belongs to the technical field of engineering testing and inspection equipment, specifically relating to a Marshall compaction apparatus. Background Technology

[0002] The Marshall test is a widely used method in asphalt mixture mix design. The test involves standard compaction of specimens under specified temperature and humidity conditions, measuring the volume, stability, and flow value of the asphalt mixture. After a series of calculations, curves showing the relationship between the asphalt-aggregate ratio and stability, flow value, density, porosity, and saturation are plotted. Finally, the optimal asphalt-aggregate ratio of the asphalt mixture is determined. The Marshall compactor is a specialized instrument for specimen preparation in the Marshall stability test of asphalt mixtures. It is suitable for preparing asphalt mixture specimens for laboratory testing of the physical and mechanical properties of asphalt mixtures. During the test, the size of the Marshall specimen needs to be determined based on the maximum nominal particle size of the aggregates in the mixture. The appropriate compaction head is then used according to the size of the Marshall specimen, and the specimen is prepared according to the specifications.

[0003] In existing technologies, to ensure the compaction of the components is robust and the compaction process is stable, the connection between the compaction head and the guide rod is cumbersome. When both standard and large Marshall specimens are required, the compaction head is difficult to replace, leading to low testing efficiency. Furthermore, frequent compaction head replacements can easily damage the equipment. In practical applications, to avoid replacing the compaction head, some projects have to purchase two Marshall compactors—one for standard Marshall specimen molding and the other for large Marshall specimen molding—significantly increasing testing costs.

[0004] Therefore, there is an urgent need to develop a Marshall compactor with a convenient interchangeable compaction head to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a Marshall compactor capable of simultaneously molding both standard and large Marshall specimens, and the compaction head in this Marshall compactor is easily replaceable, thus improving testing efficiency. This objective is achieved through the following technical solution:

[0006] A first aspect of the present invention provides a Marshall compaction apparatus, comprising:

[0007] Base;

[0008] A chassis, which is connected to the base;

[0009] Mounting components are attached to the top of the chassis;

[0010] Multiple sets of trial molding components are placed on the base to accommodate the material to be molded;

[0011] Multiple sets of compaction components, each compaction component including a guide rod and a compaction head, the guide rod being arranged vertically, the top of the guide rod being provided with a connecting structure, the connecting structure being detachably connected to the mounting component; the compaction head being connected to the bottom of the guide rod, the compaction head being used to compact the material to be formed.

[0012] The Marshall compactor in this technical solution uses different models of compaction components and mold components for different types of specimens, thus simultaneously satisfying the molding of standard Marshall specimens and large Marshall specimens. The material to be molded in the mold component is hammered by the compaction head to complete the compaction process. The top of the chassis is equipped with a mounting component for connecting the compaction components, and correspondingly, a connecting structure is provided at the top of the guide rod. Since the compaction components are detachably connected to the mounting component through the connecting structure, the entire compaction component can be replaced when the specimen type needs to be changed. Compared to the existing technology of removing the compaction head from the guide rod, this method is more convenient and faster, greatly improving testing efficiency and avoiding equipment damage caused by frequent compaction head replacements.

[0013] In addition, the Marshall compactor of the present invention may also have the following additional technical features:

[0014] In some embodiments of the present invention, the mounting assembly includes a mounting plate and two support plates. The mounting plate has a clearance notch that allows the guide rod to pass through. The support plates are arranged vertically and connected to the mounting plate. The two support plates are located on both sides of the clearance notch. The support plates have slots extending vertically. The connection structure includes two connecting shafts located on both sides of the guide rod. The two connecting shafts are respectively used to insert into the slots on the two support plates.

[0015] In some embodiments of the present invention, the Marshall compactor further includes a hammer-lifting assembly, which includes a mounting base, a hammer-lifting rod, a rotating shaft, and a support rod. The mounting base is connected to the top of the mounting plate, the rotating shaft is rotatably inserted through the mounting base, the hammer-lifting rod and the support rod are respectively connected to the two ends of the rotating shaft, and the end of the support rod away from the rotating shaft is used to support the connecting shaft. Rotating the hammer-lifting rod in the forward direction can drive the support rod to rotate in the forward direction, and rotating the support rod in the forward direction can cause the connecting shaft to move upward along the slot.

[0016] In some embodiments of the present invention, the trial mold assembly includes a sleeve, a trial mold body, and a trial mold base stacked sequentially. A positioning protrusion is provided on the end face of the base, and a positioning groove is provided on the bottom of the trial mold base. The positioning protrusion is used to insert and cooperate with the positioning groove. The trial mold body and the trial mold base form a receiving cavity for placing the material to be molded. The trial mold assembly is pressed onto the base by the sleeve.

[0017] In some embodiments of the present invention, the outer periphery of the sleeve is provided with a rib, and the Marshall compactor further includes two sets of locking assemblies. The two sets of locking assemblies are respectively disposed on both sides of the mold assembly. The locking assembly includes a guide rod, a first spring, and a pressure block. The top of the guide rod is connected to an abutment. The first spring and the pressure block are sleeved on the guide rod. The top of the first spring abuts against the abutment, and the bottom of the first spring abuts against the pressure block. The pressure block can reciprocate along the axial direction of the guide rod and is used to press the rib.

[0018] In some embodiments of the present invention, the guide rod is rotatably connected to a rotating block, the rotating block is located at the bottom of the pressure block and abuts against the pressure block, and the distance from the edge of the rotating block to the rotation center of the rotating block gradually changes along the circumference of the rotating block. Rotating the rotating block can cause the pressure block to move downward under the action of the first spring's own restoring force and press the protruding rib.

[0019] In some embodiments of the present invention, the compaction assembly further includes a compaction hammer slidably connected to the guide rod, the compaction hammer being movable downward along the guide rod to hammer the compaction head.

[0020] In some embodiments of the present invention, the Marshall compactor further includes a drive assembly and a transmission assembly. The transmission assembly includes a transmission chain with a drive block disposed on the transmission chain. The compaction hammer has a working block disposed on it. The working block includes a support portion, which includes two plate-like structures spaced apart in a vertical direction. The drive assembly is used to drive the transmission chain to rotate. The rotation of the transmission chain can drive the drive block to rise. When the drive block rises, it can abut against the plate-like structures to move the compaction hammer upward.

[0021] In some embodiments of the present invention, the tamping hammer is provided with a guide hole extending in a vertical direction, and the inner wall of the guide hole is provided with a plurality of grooves extending in a vertical direction. The plurality of grooves are spaced apart circumferentially along the guide hole. The guide rod passes through the guide hole, and the tamping hammer is slidably connected to the guide hole and the guide rod.

[0022] In some embodiments of the present invention, the compaction head includes a first compaction part and a second compaction part. The first compaction part has a cavity extending vertically. The guide rod passes through the cavity. The first compaction part is capable of reciprocating along the guide rod. A second spring is disposed inside the cavity. The second spring is sleeved on the guide rod. A fastener is connected to the bottom of the guide rod. The top of the second spring abuts against the top of the first compaction part, and the bottom of the second spring abuts against the fastener. The second compaction part is connected to the bottom of the first compaction part. When the compaction hammer moves downward along the guide rod to strike the first compaction part, the second spring contracts, and the second compaction part strikes the material to be formed. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0024] Figure 1 schematically shows a structural diagram of a Marshall compactor according to an embodiment of the present invention;

[0025] Figure 2 schematically shows a magnified view of a portion of point A in Figure 1;

[0026] Figure 3 schematically shows a partial structural diagram of a Marshall compactor according to an embodiment of the present invention;

[0027] Figure 4 schematically shows a structural diagram of the compaction assembly according to an embodiment of the present invention;

[0028] Figure 5 schematically shows a structural diagram of a compaction hammer according to an embodiment of the present invention from a certain perspective;

[0029] Figure 6 schematically shows a structural diagram of the compaction hammer according to an embodiment of the present invention from another perspective;

[0030] Figure 7 schematically shows a structural diagram of a working block according to an embodiment of the present invention;

[0031] Figure 8 schematically shows a partial cross-sectional view of the compaction assembly according to an embodiment of the present invention;

[0032] Figure 9 schematically shows a magnified view of a portion of point A in Figure 1;

[0033] Figure 10 schematically shows a structural diagram of a locking assembly according to an embodiment of the present invention.

[0034] The reference numerals in the attached drawings represent the following: 100, base; 200, chassis; 300, mounting assembly; 310, mounting plate; 320, support plate; 321, slot; 330, limiting plate; 340, stop block; 400, compaction assembly; 410, guide rod; 420, connecting structure; 421, connecting shaft; 422, bushing; 423, retaining ring; 430, compaction head; 431, first compaction part; 432, second compaction part; 433, second spring; 434, fastener; 435, shaft end stop plate; 436, gasket; 437, cotter pin; 440, compaction hammer; 441, working block; 4410, working block body; 4411, support part; 4411a, plate structure; 442, guide hole; 443, limiting hole; 450, wedge block; 500. Hammer lifting assembly; 510. Mounting base; 520. Hammer lifting rod; 530. Rotating shaft; 540. Support rod; 550. Limiting component; 600. Trial mold assembly; 610. Sleeve; 611. Protruding rib; 620. Trial mold body; 630. Trial mold base; 700. Locking assembly; 710. Guide rod; 720. Abutment component; 730. First spring; 740. Pressure block; 750. Rotating block; 760. Locking handle; 770. Connecting pin; 800. Drive assembly; 900. Transmission assembly; 910. Drive sprocket; 920. Driven sprocket; 930. Transmission chain; 931. Drive block. Detailed Implementation

[0035] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0036] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0037] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0038] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0039] Figure 1 schematically shows a structural diagram of a Marshall compactor according to an embodiment of the present invention. Figure 2 schematically shows a partial enlarged view of the structure at point A in Figure 1. As shown in Figures 1 and 2, the present invention proposes a Marshall compactor, including a base 100, a housing 200, a mounting assembly 300, multiple sets of trial mold assemblies 600, and multiple sets of compaction assemblies 400; the base 100 is used to place the material to be formed; the housing 200 is connected to the base 100; the mounting assembly 300 is connected to the top of the housing 200; the trial mold assembly 600 is placed on the base 100 and is used to accommodate the material to be formed; the compaction assembly 400 includes a guide rod 410 and a compaction head 430, the guide rod 410 is arranged vertically, and a connecting structure 420 is provided at the top of the guide rod 410, the connecting structure 420 and the mounting assembly 300 are detachably connected; the compaction head 430 is connected to the bottom of the guide rod 410, and the compaction head 430 is used to compact the material to be formed.

[0040] The Marshall compactor in this technical solution uses different models of compaction components 400 and mold components 600 for different types of specimens, thus simultaneously satisfying the molding of standard Marshall specimens and large Marshall specimens. The material to be molded in the mold component 600 is hammered by the compaction head 430 to complete the material compaction process. The top of the chassis 200 is equipped with a mounting component 300 for connecting the compaction component 400. Correspondingly, a connecting structure 420 is provided on the top of the guide rod 410. Since the compaction component 400 is detachably connected to the mounting component 300 through the connecting structure 420, the entire compaction component 400 can be replaced when the specimen type needs to be changed. Compared to the existing technology of removing the compaction head 430 from the guide rod 410, this method is more convenient and faster, greatly improving testing efficiency and avoiding equipment damage caused by frequent replacement of the compaction head 430.

[0041] Referring again to Figures 1 and 2, the base 100 is roughly rectangular in shape, serving as a load-bearing structure for the chassis 200 and other components such as the compaction assembly 400, and capable of withstanding the hammering force generated by the compaction assembly 400 during use. The chassis 200 includes two opposing side panels, whose rear ends are stably connected by a back panel, and whose front ends are connected by a front panel. The chassis 200 supports the mounting assembly 300 and protects its internal components.

[0042] Furthermore, in this embodiment, a Marshall compactor is equipped with two sets of compaction components 400, one set for standard Marshall specimen molding and the other set for large Marshall specimen molding. During use, the appropriate compaction component 400 can be selected according to the type of specimen. Understandably, the compaction heads 430 in the two sets of compaction components 400 are respectively set according to the diameter of the molded specimen, while the guide rods 410 and connecting structures 420 in the two sets of compaction components 400 can adopt the same structural form.

[0043] Further, Figure 3 schematically shows a partial structural diagram of a Marshall compactor according to an embodiment of the present invention. Figure 4 schematically shows a structural diagram of a compaction assembly 400 according to an embodiment of the present invention. Referring to Figures 2 to 4, the mounting assembly 300 includes a mounting plate 310 and two support plates 320. The mounting plate 310 is provided with a clearance notch that allows the guide rod 410 to pass through. The support plates 320 are arranged vertically and connected to the mounting plate 310. The two support plates 320 are respectively located on both sides of the clearance notch. The support plates 320 have slots 321 extending vertically. The connecting structure 420 includes two connecting shafts 421, which are respectively located on both sides of the guide rod 410. The two connecting shafts 421 are respectively used to insert into the slots 321 on the two support plates 320.

[0044] Optionally, the clearance notch is located on the side of the mounting plate 310 closer to the operator, and the opening of the slot 321 faces upward. When installing the compaction assembly 400, the operator needs to hold the guide rod 410, ensuring the height of the connecting structure 420 exceeds the support plate 320, and move the guide rod 410 laterally into the clearance notch. Then, align the connecting shaft 421 with the slot 321, and move the guide rod 410 vertically downward to insert the connecting shaft 421 into the slot 321. The installation of the compaction assembly 400 can be completed simply by moving it, making the operation very convenient and greatly improving testing efficiency when multiple specimens need to be molded. Furthermore, during the loading and unloading of the compaction assembly 400, it is not necessary to disassemble or assemble the individual components within the compaction assembly 400, thus preserving the integrity of the compaction assembly 400 and effectively avoiding wear problems caused by the loading and unloading of other components such as the compaction head 430 and the guide rod 410.

[0045] Optionally, the mounting plate 310 is bolted to the top of the chassis 200. To reduce wobbling of the guide rod 410 during operation, a stop 340 is provided at the front end of the clearance notch. Specifically, the clearance notch includes a large notch and a small notch that communicate with each other. The large notch is located at the front end of the mounting plate 310. During assembly, after the guide rod 410 enters the small notch, it indicates that the connecting shaft 421 is aligned with the slot 321, and the guide rod 410 can be moved downward. After the connecting shaft 421 is inserted into the slot 321, the stop 340 is installed in the large notch, thereby confining the guide rod 410 within the small notch. Optionally, the stop 340 is fixed to the mounting plate 310 by bolts.

[0046] Furthermore, the Marshall compactor also includes a hammer-lifting assembly 500, which includes a mounting base 510, a hammer-lifting rod 520, a rotating shaft 530, and a support rod 540. The mounting base 510 is connected to the top of the mounting plate 310, and the rotating shaft 530 is rotatably inserted through the mounting base 510. The hammer-lifting rod 520 and the support rod 540 are respectively connected to the two ends of the rotating shaft 530. The end of the support rod 540 away from the rotating shaft 530 is used to support the connecting shaft 421. Rotating the hammer-lifting rod 520 in the forward direction can drive the support rod 540 to rotate in the forward direction, and rotating the support rod 540 in the forward direction can cause the connecting shaft 421 to move upward along the slot 321.

[0047] After the compaction assembly 400 is installed, the compaction head 430 extends into the interior of the mold assembly 600. Therefore, when it is necessary to remove the specimen or replace the mold assembly 600, the compaction head 430 needs to be lifted upwards. The compaction assembly 400 can be easily lifted by providing the lifting hammer assembly 500. Optionally, the mounting base 510 includes a base plate and two vertically arranged upright plates. The bottoms of both upright plates are connected to the base plate, and the two upright plates are spaced apart. The base plate is fixedly connected to the mounting plate 310 by bolts. Mounting holes are provided on the upright plates, through which the rotating shaft 530 rotatably passes sequentially. Optionally, rolling bearings are provided in the mounting holes, with the outer ring of the bearing fixedly connected to the upright plate and the inner ring of the bearing fixedly connected to the rotating shaft 530. By providing rolling bearings, the rotation of the rotating shaft 530 can be made smooth and reliable, reducing wear on the upright plates and the rotating shaft 530.

[0048] Optionally, the hammer lifting rod 520 is located on the right side of the housing 200. The length and extension direction of the hammer lifting rod 520 are set according to the usage requirements to facilitate the operation of the operator. The top of the hammer lifting rod 520 is provided with an external thread, and the end of the rotating shaft 530 that is used to connect with the hammer lifting rod 520 is provided with a through hole. The hammer lifting rod 520 passes through the through hole and is locked with a nut.

[0049] Optionally, the support rod 540 is provided with a socket for connecting the rotating shaft 530. The end of the rotating shaft 530 used to connect with the support rod 540 has a rounded rectangular cross-section, and correspondingly, the socket is a rounded rectangular hole, preventing relative rotation after insertion. Alternatively, the socket can be oblong, square, or other non-circular holes that prevent relative rotation between the support rod 540 and the rotating shaft 530. Optionally, the rear end of the support rod 540 has a notch that communicates with the socket, allowing the socket to be inserted into the rotating shaft 530. After the support rod 540 and the rotating shaft 530 are inserted, bolts are used to lock the notch portion of the support rod 540 to prevent it from falling out. Optionally, long bolts are used to secure the support rod 540 and the rotating shaft 530 at the top of the support rod 540 opposite the socket. Optionally, the end of the support rod 540 used to support the connecting shaft 421 is bent upwards into a hook shape.

[0050] When it is necessary to lift the compaction head 430, the operator can hold the end of the lifting hammer rod 520 and rotate it clockwise to lift the end of the lifting hammer rod 520 upwards. This allows the support rod 540 to be lifted upwards, which in turn lifts the compaction assembly 400, moving the compaction head 430 away from the test mold assembly 600. The operator can then remove the test mold assembly 600. The support rod 540 and the lifting hammer rod 520 form a lever with the axis of the connecting shaft 421 as the center of rotation, utilizing the lever principle to easily lift the compaction assembly 400.

[0051] Further, referring to Figures 2 and 3, the opening of the slot 321 is located at the top of the support plate 320. A limiting piece 330 is detachably connected to the top of the support plate 320. The limiting piece 330 is used to seal the opening of the slot 321 to prevent the support rod 540 from lifting the connecting shaft 421 away from the support plate 320. Optionally, the limiting piece 330 is connected to the top of the support plate 320 by bolts. After assembling the compaction assembly 400, the limiting piece 330 seals the opening of the slot 321, thereby preventing the support rod 540 from lifting the connecting shaft 421 out of the slot 321 when the trial mold assembly 600 needs to be removed, thus preventing the compaction assembly 400 from injuring the operator.

[0052] Further, referring to Figures 3 and 4, the connecting shaft 421 is fitted with a bushing 422, which is used to contact the support rod 540. Understandably, the bushing 422 effectively prevents wear on the connecting shaft 421, thereby increasing the service life of the compaction assembly 400. Optionally, a retaining ring 423 is provided at the end of the connecting shaft 421 away from the bushing 422. The retaining ring 423 and the bushing 422 are spaced apart, and the connecting shaft 421 between the retaining ring 423 and the bushing 422 is used for insertion into the slot 321.

[0053] Further, referring to Figure 3, a limiting member 550 is connected to one side of the mounting plate 310. The lifting hammer rod 520 abuts against the limiting member 550, which prevents the lifting hammer rod 520 from rotating in the opposite direction. By setting the limiting member 550 to support the lifting hammer rod 520, the support rod 540 can stably support the connecting shaft 421.

[0054] Further, Figure 5 schematically shows a structural schematic diagram of the compaction hammer 440 according to an embodiment of the present invention from one viewpoint. Figure 6 schematically shows a structural schematic diagram of the compaction hammer 440 according to an embodiment of the present invention from another viewpoint. Figure 7 schematically shows a structural schematic diagram of the working block according to an embodiment of the present invention. Referring to Figures 4 to 7, the compaction assembly 400 also includes a compaction hammer 440, which is slidably connected to a guide rod 410 and is capable of moving downward along the guide rod 410 to hammer the compaction head 430. Referring to Figures 1 and 2, the Marshall compactor also includes a drive assembly 800 and a transmission assembly 900. The transmission assembly 900 includes a transmission chain 930, on which a drive block 931 is mounted. A working block 441 is mounted on the compaction hammer 440. The drive assembly 800 drives the transmission chain 930 to rotate. The rotation of the transmission chain 930 causes the drive block 931 to rise. During the rising process, the drive block 931 can abut against the working block 441, causing the compaction hammer 440 to move upwards. Optionally, the drive assembly 800 includes a motor, and the transmission assembly 900 also includes a drive sprocket 910 and a driven sprocket 920, which are connected via the transmission chain 930. The motor is connected to a drive gear, and the transmission assembly 900 also includes a driven gear coaxially driven with the drive sprocket 910. The drive gear and the driven gear are connected via a transmission link. During operation, the motor drives the drive gear to rotate, which in turn drives the driven gear to rotate. The drive sprocket 910 and the driven gear rotate synchronously, which in turn drives the transmission chain 930 and the driven gear to rotate. When the drive block 931 rotates to the bottom of the working block 441 and comes into contact with it, the drive block 931 continues to move upward and drives the compaction hammer 440 to move upward. When the drive block 931 continues to rotate until it disengages from the working block 441, the compaction hammer 440 falls freely along the guide rod 410, thereby hammering the compaction head 430.

[0055] Optionally, two drive blocks 931 are provided, with the two drive blocks 931 located on opposite sides of the moving direction of the transmission chain 930. Each drive block 931 is equipped with a sensing component. A proximity switch is provided in the housing 200 at the point where the drive block 931 and the working block 441 are separated. The proximity switch detects the sensing component and counts the number of hammer blows. After a preset number of blows are completed, the trial mold assembly 600 is removed.

[0056] Further referring to Figure 7, the working block 441 includes a support portion 4411. The support portion 4411 includes two sheet-like structures 4411a spaced apart along the vertical direction (the falling direction of the hammer 440). When the drive block 931 rises, it can abut against the sheet-like structures 4411a to move the hammer 440 upward. Because there is a certain gap between the two sheet-like structures 4411a, they can provide shock absorption when the drive block 931 and the working block 441 come into contact. Exemplarily, the working block 441 also includes a working block 441 body. The support portion 4411 and the working block 441 body are integrally formed. Two support portions 4411 are provided, spaced apart and corresponding one-to-one with the two drive blocks 931. The working block 441 body passes through the hammer 440, and the two support portions 4411 are connected to the working block 441 body and oriented towards the drive block 931. In some embodiments, the support portion 4411 may also be block-shaped.

[0057] During the specimen molding process, the compaction hammer 440 should fall freely from a set height. Hammer dropping refers to the compaction hammer 440 failing to fall normally or exhibiting abnormalities during its descent, which can easily lead to inaccurate test results. In this embodiment, the motor is positioned at the top of the entire device, so that during use, the drive chain 930 near the compaction hammer 440 is stressed, thus avoiding the drawback of the distal drive chain 930 being stressed and causing hammer dropping when the motor is at the bottom.

[0058] Further, referring to Figures 5 and 6, the compaction hammer 440 is provided with a guide hole 442 extending vertically. The inner wall of the guide hole 442 is provided with multiple grooves extending vertically, spaced circumferentially around the guide hole 442. The guide rod 410 passes through the guide hole 442, and the compaction hammer 440 and the guide rod 410 are slidably connected through the guide hole 442 and the guide rod 410. By providing multiple grooves extending vertically on the inner wall of the guide hole 442, the contact area between the guide hole 442 and the guide rod 410 can be reduced, thereby reducing friction between the compaction hammer 440 and the guide rod 410, avoiding energy loss, and ensuring the accuracy of the hammering force.

[0059] Optionally, the hammer 440 is also provided with a limiting hole 443 extending vertically, and the limiting hole 443 is connected to the guide hole 442. A wedge block 450 is connected to the guide rod 410, with the thinner end of the wedge block 450 facing the bottom of the guide rod 410. The limiting hole 443 on the hammer 440 is directly opposite the wedge block 450. When the hammer 440 moves upward, the wedge block 450 can engage with the limiting hole 443, thereby limiting the falling height of the hammer 440.

[0060] Further, Figure 8 schematically shows a partial cross-sectional view of the compaction assembly 400 according to an embodiment of the present invention. Referring to Figure 8, the compaction head 430 includes a first compaction part 431 and a second compaction part 432. The first compaction part 431 has a cavity extending vertically, and a guide rod 410 passes through the cavity. The first compaction part 431 is capable of reciprocating along the guide rod 410. A second spring 433 is disposed inside the cavity and is sleeved on the guide rod 410. A fastener 434 is connected to the bottom of the guide rod 410. The top of the second spring 433 abuts against the top of the first compaction part 431, and the bottom of the second spring 433 abuts against the fastener 434. The second compaction part 432 is connected to the bottom of the first compaction part 431. When the compaction hammer 440 moves downward along the guide rod 410 to hammer the first compaction part 431, the second spring 433 contracts, and the second compaction part 432 hammers the material to be formed. Understandably, when the compaction hammer 440 moves away from the first compaction section 431, the first compaction section 431 moves upward under the restoring force of the second spring 433. This structural design can buffer the impact of the compaction hammer 440 on the compaction head 430, reducing vibration.

[0061] Optionally, the bottom of the guide rod 410 is provided with an external thread, and the fastener 434 is a nut. The bottom of the second spring 433 is provided with a shaft end plate 435, and a washer 436 is provided between the shaft end plate 435 and the nut. A cotter pin 437 is provided at the bottom of the nut. By fitting the cotter pin 437 onto the guide rod 410 and making the cotter pin 437 abut against the nut, the rotation of the nut can be effectively prevented.

[0062] Furthermore, Figure 9 schematically shows a partial enlarged view of point A in Figure 1. The trial mold assembly 600 includes a sleeve 610, a trial mold body 620, and a trial mold base 630 stacked sequentially. A positioning protrusion is provided on the end face of the base 100, and a positioning groove is provided on the bottom of the trial mold base 630. The positioning protrusion is used to insert and cooperate with the positioning groove. The trial mold body 620 and the trial mold base 630 form a receiving cavity for placing the material to be molded. The trial mold assembly 600 is pressed onto the base 100 by the sleeve 610.

[0063] In existing technologies, the mold base 630 and the base 100 are typically connected by screws. As the test progresses, vibrations can easily cause these screws to loosen. After multiple specimens have been molded, the mold assembly 600 may shift in position, causing the impact hammer 440 to rub against the inner wall of the mold body 620, resulting in non-standard Marshall specimens. Furthermore, the connection positions of the mold base 630 and the base 100 differ for large and standard Marshall specimens. When simultaneously molding both, frequent screw repositioning is required, reducing work efficiency. In this technical solution, the mold base 630 and the base 100 are positioned using a positioning groove and a positioning protrusion, effectively preventing the mold assembly 600 from shifting due to vibration during operation. Moreover, during use, the mold base 630 can simply be placed on the base 100, making operation convenient and improving testing efficiency. Optionally, the positioning groove is circular and concentrically positioned with the mold base 630. Accordingly, the positioning protrusion is a circular protrusion.

[0064] Furthermore, the outer periphery of the sleeve 610 is provided with a protruding rib 611. The Marshall compactor also includes two sets of locking components 700, which are respectively disposed on both sides of the mold assembly 600. Each locking component 700 includes a guide rod 710, a first spring 730, and a pressure block 740. The top of the guide rod 710 is connected to an abutment 720. The first spring 730 and the pressure block 740 are sleeved on the guide rod 710. The top of the first spring 730 abuts against the abutment 720, and the bottom of the first spring 730 abuts against the pressure block 740. The pressure block 740 can reciprocate along the axial direction of the guide rod 710. The pressure block 740 is used to press the protruding rib 611. In this embodiment, the rib 611 and the sleeve 610 are integrally formed, combining the rib 611 and the sleeve 610 into a single unit. This changes the mold assembly 600 from four parts in the prior art to three parts: the sleeve 610, the mold body 620, and the mold base 630, thus simplifying the process of replacing the mold assembly 600. Optionally, the rib 611 can be located at the top of the sleeve 610 or at the middle of the sleeve 610.

[0065] Further, Figure 10 schematically shows a structural diagram of the locking assembly 700 according to an embodiment of the present invention. The guide rod 710 is rotatably connected to a rotating block 750, which is located at the bottom of the pressure block 740 and abuts against the pressure block 740. Along the circumference of the rotating block 750, the distance from the edge of the rotating block 750 to the rotation center of the rotating block 750 gradually changes. Rotating the rotating block 750 can cause the pressure block 740 to move downward under the action of the self-restoring force of the first spring 730 and press against the protruding rib 611.

[0066] In this embodiment, the rotating block 750 is a cylindrical block structure. The rotation center of the rotating block 750 does not coincide with the circle of the rotating block 750, so the distance from the edge of the rotating block 750 to the rotation center gradually changes. Optionally, a connecting pin 770 is connected to the guide rod 710, and the rotating block 750 is rotatably sleeved on the connecting pin 770. Optionally, a locking handle 760 is connected to the rotating block 750. By rotating the locking handle 760, the rotating block 750 can be rotated. The rotation of the rotating block 750 can cause the pressure block 740 to move downward or upward, thereby pressing or releasing the trial mold assembly 600.

[0067] The usage process of the Marshall compactor provided in this technical solution is as follows:

[0068] When the compaction assembly 400 needs to be replaced, remove the limiting piece 330 on the support plate 320 and the stop block 340 on the mounting plate 310. Holding the guide rod 410, move the compaction assembly 400 upwards so that the connecting shaft 421 is removed from the slot 321. Insert the guide rod 410 of the compaction assembly 400 to be replaced into the clearance notch and insert the connecting shaft 421 into the slot 321 to complete the replacement of the compaction assembly 400.

[0069] When it is necessary to replace the test mold assembly 600, first turn the locking handle 760 to move the pressure block 740 away from the protruding rib 611 on the sleeve 610. Then, lift the end of the lifting hammer rod 520 upward, so that the support rod 540 drives the connecting shaft 421 to move upward, thereby moving the compaction head 430 away from the test mold assembly 600. At this time, the test mold assembly 600 can be removed. When placing the test mold assembly 600, lift the lifting hammer rod 520 to move the compaction head 430 upward, so that the positioning groove at the bottom of the test mold base 630 is aligned with the positioning protrusion on the base 100 to place the test mold base 630 on the base 100. Then, stack the test mold body 620 and the sleeve 610 in sequence, release the lifting hammer rod 520 to let the compaction head 430 fall. Finally, rotate the rotating block 750 by the locking handle 760 to move the pressure block 740 downward to press the protruding rib 611 on the sleeve 610. When it is necessary to add the material to be molded into the interior of the mold body 620, the compaction head 430 can also be moved away from the mold assembly 600 by lifting the lifting hammer rod 520.

[0070] When material needs to be compacted, the motor is started, driving the drive gear to rotate. The drive gear drives the driven gear to rotate, and the drive sprocket 910 and the driven gear rotate synchronously, driving the transmission chain 930 and the driven gear to rotate. When the drive block 931 rotates to the bottom of the working block 441 and abuts against it, the drive block 931 continues to move upward, driving the compaction hammer 440 upward. When the drive block 931 continues to rotate until it disengages from the working block 441, the compaction hammer 440 falls freely along the guide rod 410, thereby hammering the compaction head 430. After the proximity switch senses the sensing element, it counts the number of hammer blows. After completing the preset number of blows, the test mold assembly 600 is removed.

[0071] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A Marshall compactor, characterized in that, include: Base (100); A chassis (200) is connected to the base (100); Mounting assembly (300) is attached to the top of the chassis (200); Multiple sets of trial molding components (600) are placed on the base (100) to accommodate the material to be molded; Multiple sets of compaction components (400) are provided. Each compaction component (400) includes a guide rod (410) and a compaction head (430). The guide rod (410) is arranged vertically, and a connecting structure (420) is provided at the top of the guide rod (410). The connecting structure (420) and the mounting component (300) are detachably connected. The compaction head (430) is connected to the bottom of the guide rod (410) and is used to compact the material to be formed.

2. The Marshall compactor according to claim 1, characterized in that, The mounting assembly (300) includes a mounting plate (310) and two support plates (320). The mounting plate (310) has a clearance notch that allows the guide rod (410) to pass through. The support plates (320) are arranged vertically and connected to the mounting plate (310). The two support plates (320) are located on both sides of the clearance notch. The support plates (320) have slots (321) extending vertically. The connecting structure (420) includes two connecting shafts (421). The two connecting shafts (421) are located on both sides of the guide rod (410). The two connecting shafts (421) are respectively used to insert into the slots (321) on the two support plates (320).

3. The Marshall compactor according to claim 2, characterized in that, The Marshall compactor also includes a hammer-lifting assembly (500), which includes a mounting base (510), a hammer-lifting rod (520), a rotating shaft (530), and a support rod (540). The mounting base (510) is connected to the top of the mounting plate (310). The rotating shaft (530) is rotatably inserted through the mounting base (510). The hammer-lifting rod (520) and the support rod (540) are respectively connected to the two ends of the rotating shaft (530). The end of the support rod (540) away from the rotating shaft (530) is used to support the connecting shaft (421). Rotating the hammer-lifting rod (520) in the forward direction can drive the support rod (540) to rotate in the forward direction. Rotating the support rod (540) in the forward direction can cause the connecting shaft (421) to move upward along the slot (321).

4. The Marshall compactor according to any one of claims 1-3, characterized in that, The trial mold assembly (600) includes a sleeve (610), a trial mold body (620), and a trial mold base (630) stacked in sequence. A positioning protrusion is provided on the end face of the base (100), and a positioning groove is provided on the bottom of the trial mold base (630). The positioning protrusion is used to insert and cooperate with the positioning groove. The trial mold body (620) and the trial mold base (630) form a cavity for placing the material to be molded. The trial mold assembly (600) is pressed onto the base (100) by the sleeve (610).

5. The Marshall compactor according to claim 4, characterized in that, The sleeve (610) is provided with a rib (611) on its outer periphery. The Marshall compactor also includes two sets of locking components (700). The two sets of locking components (700) are respectively arranged on both sides of the mold assembly (600). The locking component (700) includes a guide rod (710), a first spring (730) and a pressure block (740). The top of the guide rod (710) is connected to an abutment (720). The first spring (730) and the pressure block (740) are sleeved on the guide rod (710). The top of the first spring (730) abuts against the abutment (720), and the bottom of the first spring (730) abuts against the pressure block (740). The pressure block (740) can reciprocate along the axial direction of the guide rod (710). The pressure block (740) is used to press the rib (611).

6. The Marshall compactor according to claim 5, characterized in that, The guide rod (710) is rotatably connected to a rotating block (750). The rotating block (750) is located at the bottom of the pressure block (740) and abuts against the pressure block (740). Along the circumference of the rotating block (750), the distance from the edge of the rotating block (750) to the rotation center of the rotating block (750) gradually changes. Rotating the rotating block (750) can cause the pressure block (740) to move downward under the action of the self-restoring force of the first spring (730) and press against the protruding rib (611).

7. The Marshall compactor according to any one of claims 1-3, characterized in that, The compaction assembly (400) further includes a compaction hammer (440) slidably connected to the guide rod (410), and the compaction hammer (440) is capable of moving downward along the guide rod (410) to hammer the compaction head (430).

8. The Marshall compactor according to claim 7, characterized in that, The Marshall compactor also includes a drive assembly (800) and a transmission assembly (900). The transmission assembly (900) includes a transmission chain (930), on which a drive block (931) is provided. The compaction hammer (440) is provided with a working block (441). The working block (441) includes a support portion (4411). The support portion (4411) includes two sheet-like structures (4411a) spaced apart in the vertical direction. The drive assembly (800) is used to drive the transmission chain (930) to rotate. The rotation of the transmission chain (930) can drive the drive block (931) to rise. When the drive block (931) rises, it can abut against the sheet-like structures (4411a) to move the compaction hammer (440) upward.

9. The Marshall compactor according to claim 7, characterized in that, The hammer (440) is provided with a guide hole (442) extending in the vertical direction. The inner wall of the guide hole (442) is provided with a plurality of grooves extending in the vertical direction. The plurality of grooves are spaced apart circumferentially along the guide hole (442). The guide rod (410) passes through the guide hole (442). The hammer (440) and the guide rod (410) are slidably connected through the guide hole (442) and the guide rod (410).

10. The Marshall compactor according to claim 9, characterized in that, The compaction head (430) includes a first compaction part (431) and a second compaction part (432). The first compaction part (431) has a cavity extending vertically. The guide rod (410) passes through the cavity. The first compaction part (431) can reciprocate along the guide rod (410). A second spring (433) is provided inside the cavity. The second spring (433) is sleeved on the guide rod (410). A fastener (432) is connected to the bottom of the guide rod (410). 34), the top of the second spring (433) abuts against the top of the first compaction part (431), the bottom of the second spring (433) abuts against the fastener (434), the second compaction part (432) is connected to the bottom of the first compaction part (431), when the compaction hammer (440) moves downward along the guide rod (410) to hammer the first compaction part (431), the second spring (433) contracts, and the second compaction part (432) hammers the material to be formed.

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