Marshall compaction apparatus

Abstract

The invention belongs to the technical field of engineering test detection equipment, and particularly relates to a Marshall compaction test apparatus. The Marshall compaction apparatus comprises a base, a case, a mounting assembly, a plurality of groups of test mold assemblies and a plurality of groups of compaction assemblies, the case is connected to the base; the mounting assembly is connected to the top of the case; the test mold assembly is placed on the base and used for containing materials to be formed. The compaction assembly comprises a guide rod and a compaction head, the guide rod is arranged in the vertical direction, a connecting structure is arranged at the top of the guide rod, and the connecting structure is detachably connected with the mounting assembly; the compacting head is connected to the bottom of the guide rod and used for compacting materials to be formed. By using the Marshall compaction apparatus in the technical scheme, when the type of the test piece needs to be replaced, the compaction assembly can be integrally replaced, so that the test efficiency is greatly improved, and the condition of equipment damage caused by frequent replacement of the compaction head can be avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering test and detection equipment, and in particular relates to a Marshall compaction instrument. Background Art

[0002] The Marshall test is one of the widely used methods for asphalt mixture mix design. The test process is to compact the specimens in a standard manner under specified conditions such as temperature and humidity, and measure the volume, stability, flow value and other indicators of the asphalt mixture. After a series of calculations, the relationship curves between the oil-stone ratio and stability, flow value, density, void ratio and saturation are drawn. Finally, the optimal oil-stone ratio of the asphalt mixture is determined. The Marshall compactor is a special instrument for molding specimens in the Marshall stability test of asphalt mixtures. It is suitable for making asphalt mixture specimens for use in the laboratory to test the physical and mechanical properties of asphalt mixtures. During the test, the size of the Marshall specimen needs to be determined according to the maximum nominal particle size of the aggregate in the mixture, and the corresponding compactor head needs to be replaced according to the size of the Marshall specimen to complete the molding of the Marshall specimen according to the specification requirements.

[0003] In the prior art, in order to ensure that the compacted components are firm and the compaction process is stable, the connection between the compaction head and the guide rod is complicated. When both the standard Marshall specimen and the large Marshall specimen need to be used at the same time, the compaction head is not easy to replace, resulting in low test efficiency. In addition, frequent replacement of the compaction head causes the equipment to be easily damaged. In actual application, in order to avoid replacing the compaction head, some projects have to purchase two Marshall compactors at the same time, one for standard Marshall specimen molding and the other for large Marshall specimen molding, which seriously increases the test cost.

[0004] Therefore, it is urgent to propose a Marshall compactor that is convenient for replacing the compaction head to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a Marshall compactor that can be used for both standard Marshall specimen molding and large Marshall specimen molding, and the compaction head in the Marshall compactor is easy to replace, which helps to improve the test efficiency. This object is achieved through the following technical solutions:

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

[0007] Pedestal;

[0008] A chassis connected to the base;

[0009] A mounting assembly connected to the top of the chassis;

[0010] A plurality of trial mold assemblies, the trial mold assemblies are placed on the base and are used to accommodate materials to be molded;

[0011] Multiple groups of compaction components, the compaction components include guide rods and compaction heads, the guide rods are arranged in a vertical direction, a connecting structure is arranged on the top of the guide rods, and the connecting structure and the mounting assembly are detachably connected; the compaction head is connected to the bottom of the guide rod, and the compaction head is used to compact the material to be formed.

[0012] The Marshall compaction instrument in this technical solution uses different types of compaction assemblies and test mold assemblies for different types of specimens during use, so it can meet the molding requirements of both standard Marshall specimens and large Marshall specimens. The compaction process of the material is completed by hammering the material to be molded in the test mold assembly through the compaction head. A mounting assembly for connecting the compaction assembly is provided on the top of the chassis, and correspondingly, a connecting structure is provided on the top of the guide rod. Since the compaction assembly is detachably connected to the mounting assembly through the connecting structure, the compaction assembly can be replaced as a whole when the specimen type needs to be changed. Compared with the method of removing the compaction head from the guide rod in the prior art, it is more convenient and quick, greatly improves the test efficiency, and can avoid equipment damage caused by frequent replacement of the compaction head.

[0013] In addition, the Marshall compaction apparatus 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 is provided with an avoidance gap allowing the guide rod to pass through, the support plate is arranged in a vertical direction and connected to the mounting plate, the two support plates are respectively located on both sides of the avoidance gap, the support plate is provided with a slot extending in the vertical direction, the connecting structure includes two connecting shafts, the two connecting shafts are respectively located on both sides of the guide rod, and the two connecting shafts are respectively used to be plugged into the slots on the two support plates.

[0015] In some embodiments of the present invention, the Marshall compaction instrument also includes a lifting hammer assembly, which includes a mounting seat, a lifting hammer rod, a rotating shaft and a support rod. The mounting seat is connected to the top of the mounting plate, and the rotating shaft is rotatably penetrated through the mounting seat. The lifting hammer 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. Forward rotation of the lifting hammer rod can drive the support rod to rotate forward, and the forward rotation of the support rod 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 in sequence, a positioning protrusion is provided on the end face of the base, a positioning groove is provided at the bottom of the trial mold base, the positioning protrusion is used to plug and cooperate with the positioning groove, the trial mold body and the trial mold base form a accommodating cavity for placing the material to be formed, and the trial mold assembly is pressed onto the base through the sleeve.

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

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

[0019] In some embodiments of the present invention, the compacting assembly further comprises a compacting hammer, which is slidably connected to the guide rod and can move downward along the guide rod to hammer the compacting head.

[0020] In some embodiments of the present invention, the Marshall compactor also includes a driving assembly and a transmission assembly, the transmission assembly includes a transmission chain, a driving block is provided on the transmission chain, a working block is provided on the compacting hammer, the working block includes a supporting portion, the supporting portion includes two sheet structures spaced apart in a vertical direction, the driving assembly is used to drive the transmission chain to rotate, the rotation of the transmission chain can drive the driving block to rise, and when the driving block rises, it can resist the sheet structure to move the compacting hammer upward.

[0021] In some embodiments of the present invention, the hammer is provided with a guide hole extending in a vertical direction, the inner wall of the guide hole is provided with a plurality of grooves extending in the vertical direction, the plurality of grooves are arranged at intervals along the circumference of the guide hole, the guide rod is passed through the guide hole, and the hammer is slidably connected to the guide rod through the guide hole.

[0022] In some embodiments of the present invention, the compacting head includes a first compacting part and a second compacting part, the first compacting part has a cavity running through in a vertical direction, the guide rod is inserted into the cavity, the first compacting part can reciprocate along the guide rod, a second spring is provided 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 compacting part, the bottom of the second spring abuts against the fastener, the second compacting part is connected to the bottom of the first compacting part, and when the compacting hammer moves downward along the guide rod to hammer the first compacting part, the second spring contracts, and the second compacting part hammers the material to be formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 The structure diagram of the Marshall compaction apparatus according to the embodiment of the present invention is schematically shown;

[0025] Figure 2 Schematically shows Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 A partial structural diagram of a Marshall compaction apparatus according to an embodiment of the present invention is schematically shown;

[0027] Figure 4 The structural diagram of the compaction assembly according to the embodiment of the present invention is schematically shown;

[0028] Figure 5 The structure diagram of the compacting hammer according to the embodiment of the present invention is schematically shown at a certain viewing angle;

[0029] Figure 6 The structure diagram of the compacting hammer according to the embodiment of the present invention is schematically shown in another viewing angle;

[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 structural cross-sectional view of a compaction assembly according to an embodiment of the present invention;

[0032] Fig. 9 Schematically shows Figure 1 A partial enlarged view of point B in the middle;

[0033] Fig.10 A schematic structural diagram of a locking assembly according to an embodiment of the present invention is shown schematically.

[0034] The reference numerals in the accompanying drawings represent the following:

[0035] 100. Base;

[0036] 200, chassis;

[0037] 300, mounting assembly; 310, mounting plate; 320, support plate; 321, slot; 330, limit plate; 340, stopper;

[0038] 400, compacting assembly; 410, guide rod; 420, connecting structure; 421, connecting shaft; 422, bushing; 423, retaining ring; 430, compacting head; 431, first compacting part; 432, second compacting part; 433, second spring; 434, fastener; 435, shaft end stopper; 436, gasket; 437, split pin; 440, compacting hammer; 441, working block; 4410, working block body; 4411, supporting part; 4411a, sheet structure; 442, guide hole; 443, limit hole; 450, wedge block;

[0039] 500, hammer lifting assembly; 510, mounting seat; 520, hammer lifting rod; 530, rotating shaft; 540, supporting rod; 550, limiting member;

[0040] 600, test mold assembly; 610, sleeve; 611, convex rib; 620, test mold body; 630, test mold base;

[0041] 700, locking assembly; 710, guide rod; 720, abutment member; 730, first spring; 740, pressure block; 750, rotating block; 760, locking handle; 770, connecting pin;

[0042] 800, drive assembly;

[0043] 900, transmission assembly; 910, driving sprocket; 920, driven sprocket; 930, transmission chain; 931, driving block. DETAILED DESCRIPTION

[0044] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0045] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0046] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0047] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0048] Figure 1 The structural diagram of a Marshall compaction instrument according to an embodiment of the present invention is schematically shown. Figure 2 Schematically shows Figure 1 A magnified view of the local structure at point A. Figure 1 and Figure 2As shown, the present invention proposes a Marshall compactor, including a base 100, a chassis 200, an installation assembly 300, a plurality of trial mold assemblies 600 and a plurality of compaction assemblies 400; the base 100 is used to place the material to be formed; the chassis 200 is connected to the base 100; the installation assembly 300 is connected to the top of the chassis 200; the trial mold assembly 600 is placed on the base 100, for accommodating 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 in a vertical direction, and a connecting structure 420 is arranged on the top of the guide rod 410, and the connecting structure 420 and the installation 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.

[0049] The Marshall compaction instrument in the present technical solution uses different types of compaction assemblies 400 and test mold assemblies 600 for different types of specimens during use, so that it can simultaneously meet the molding requirements of standard Marshall specimens and large Marshall specimens. The material to be molded in the test mold assembly 600 is hammered by the compaction head 430 to complete the compaction process of the material. The top of the chassis 200 is provided with an installation assembly 300 for connecting the compaction assembly 400. Correspondingly, a connection structure 420 is provided on the top of the guide rod 410. Since the compaction assembly 400 is detachably connected to the installation assembly 300 through the connection structure 420, the compaction assembly 400 can be replaced as a whole when the specimen type needs to be changed. Compared with the method of removing the compaction head 430 from the guide rod 410 in the prior art, it is more convenient and quick, greatly improves the test efficiency, and can avoid equipment damage caused by frequent replacement of the compaction head 430.

[0050] Continue to see Figure 1 and Figure 2 The base 100 is roughly a rectangular parallelepiped structure, which plays a bearing role for the chassis 200 and other components such as the compaction assembly 400, and can withstand the hammer force generated by the compaction assembly 400 during use. The chassis 200 includes two oppositely arranged side panels, the rear ends of the two side panels are stably connected by a back panel, and the front ends are connected by a front panel. The chassis 200 supports the installation assembly 300 and can protect the components inside it.

[0051] Furthermore, in this embodiment, a Marshall compaction instrument is equipped with two sets of compaction assemblies 400, one set is used for molding standard Marshall specimens, and the other set is used for molding large Marshall specimens. During use, a suitable compaction assembly 400 can be selected according to the type of specimen. It can be understood that the compaction heads 430 in the two sets of compaction assemblies 400 are respectively set according to the diameter of the molded specimen, and the guide rods 410 and the connecting structures 420 in the two sets of compaction assemblies 400 can adopt the same structural form.

[0052] Further, Figure 3 A partial structural diagram of a Marshall compactor according to an embodiment of the present invention is schematically shown. Figure 4 The structural diagram of the compaction assembly 400 according to an embodiment of the present invention is schematically shown. 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 an avoidance gap allowing the guide rod 410 to pass through. The support plate 320 is arranged in a vertical direction and connected to the mounting plate 310. The two support plates 320 are respectively located on both sides of the avoidance gap. The support plate 320 is provided with a slot 321 extending in the vertical direction. The connecting structure 420 includes two connecting shafts 421. The two connecting shafts 421 are respectively located on both sides of the guide rod 410. The two connecting shafts 421 are respectively used to be plugged into the slots 321 on the two support plates 320.

[0053] Optionally, the avoidance gap is located on the side of the mounting plate 310 close to the operator, and the opening of the slot 321 is upward. When installing the compaction assembly 400, the operator needs to hold the guide rod 410 so that the height of the connecting structure 420 exceeds the support plate 320, and move the guide rod 410 horizontally so that the guide rod 410 enters the avoidance gap, and then aligns the connecting shaft 421 with the slot 321, and moves the guide rod 410 vertically downward so that the connecting shaft 421 is inserted into the inside of the slot 321. The installation of the compaction assembly 400 can be completed by simply moving the compaction assembly 400, which is very convenient to operate. When multiple specimens need to be formed, the test efficiency can be greatly improved. In addition, during the loading and unloading process of the compaction assembly 400, it is not necessary to load and unload the various components in the compaction assembly 400, so that the integrity of the compaction assembly 400 will not be damaged, and the wear problem caused by the loading and unloading of other components such as the compaction head 430 and the guide rod 410 can be effectively avoided.

[0054] Optionally, the mounting plate 310 is connected to the top of the chassis 200 by bolts. In order to reduce the shaking of the guide rod 410 during operation, a stopper 340 is provided at the front end of the avoidance gap. Specifically, the avoidance gap includes a large gap and a small gap that are interconnected. The large gap is located at the front end of the mounting plate 310. When assembling, after the guide rod 410 enters the small gap, it means 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 stopper 340 is installed in the large gap, so that the guide rod 410 is confined in the small gap. Optionally, the stopper 340 is fixed to the mounting plate 310 by bolts.

[0055] Furthermore, the Marshall compaction instrument also includes a lifting hammer assembly 500, which includes a mounting seat 510, a lifting hammer rod 520, a rotating shaft 530 and a support rod 540. The mounting seat 510 is connected to the top of the mounting plate 310, and the rotating shaft 530 is rotatably arranged on the mounting seat 510. The lifting hammer 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. The forward rotation of the lifting hammer rod 520 can drive the support rod 540 to rotate forward, and the forward rotation of the support rod 540 can make the connecting shaft 421 move upward along the slot 321.

[0056] After the compaction assembly 400 is installed, the compaction head 430 extends into the interior of the test mold assembly 600. Therefore, when it is necessary to remove the test piece or replace the test mold assembly 600, the compaction head 430 needs to be lifted upward. By setting the lifting hammer assembly 500, the compaction assembly 400 can be easily lifted. Optionally, the mounting seat 510 includes a base plate and two vertically arranged vertical plates. The bottoms of the two vertical plates are connected to the base plate, and the two vertical plates are arranged at intervals. The base plate is fixedly connected to the mounting plate 310 by bolts. A mounting hole is provided on the vertical plate, and the rotating shaft 530 can rotatably pass through the mounting holes on the two vertical plates in turn. Optionally, a rolling bearing is provided in the mounting hole, the outer ring of the bearing is fixedly connected to the vertical plate, and the inner ring of the bearing is fixedly connected to the rotating shaft 530. By providing a rolling bearing, the rotation of the rotating shaft 530 can be made smooth and reliable, and the wear of the vertical plate and the rotating shaft 530 can be reduced.

[0057] Optionally, the lifting hammer rod 520 is located on the right side of the chassis 200. The length and extension direction of the lifting hammer rod 520 are set according to the use requirements to facilitate the operation of the operator. The top of the lifting hammer rod 520 is provided with an external thread, and one end of the rotating shaft 530 for connecting with the lifting hammer rod 520 is provided with a through hole, and the lifting hammer rod 520 is passed through the through hole and locked by a nut.

[0058] Optionally, a socket for connecting the rotating shaft 530 is provided on the support rod 540, and the cross section of one end of the rotating shaft 530 used to connect with the support rod 540 is a rounded rectangular hole. Correspondingly, the socket is a rounded rectangular hole, and the two cannot rotate relative to each other after being plugged in. Of course, the socket can also be a waist-shaped, square or other non-circular hole that can prevent the support rod 540 and the rotating shaft 530 from rotating relative to each other. Optionally, a notch is provided at the rear end of the support rod 540, and the notch is connected to the socket, so that the socket is inserted into the rotating shaft 530. After the support rod 540 and the rotating shaft 530 are plugged in, the part of the support rod 540 where the notch is provided is locked by a bolt to prevent the support rod 540 from falling. Optionally, at the top of the support rod 540 facing the socket, the support rod 540 and the rotating shaft 530 are fastened by a long bolt. Optionally, the support rod 540 is used to support one end of the connecting shaft 421 and is bent upward in a hook shape.

[0059] When the compaction head 430 needs to be lifted, the operator can hold the end of the hammer lever 520 and rotate the hammer lever 520 forward, that is, lift the end of the hammer lever 520 upward, so that the support rod 540 can be lifted upward and drive the compaction assembly 400 to be lifted, so that the compaction head 430 is away from the test mold assembly 600, and then the operator can remove the test mold assembly 600. The support rod 540 and the hammer lever 520 form a lever with the axis of the connecting shaft 421 as the rotation center, and the effect of easily lifting the compaction assembly 400 is achieved by using the lever principle.

[0060] Further, see Figure 2 and Figure 3 , the opening of the slot 321 is located at the top of the support plate 320, and the top of the support plate 320 is detachably connected with a limit plate 330, and the limit plate 330 is used to block the opening of the slot 321 to prevent the support rod 540 from lifting the connecting shaft 421 off the support plate 320. Optionally, the limit plate 330 is connected to the top of the support plate 320 by bolts. After assembling the compaction assembly 400, the limit plate 330 is used to block the opening of the slot 321, so that when the trial mold assembly 600 needs to be removed, it can be prevented that the support rod 540 lifts the connecting shaft 421 out of the slot 321, causing the compaction assembly 400 to injure the operator.

[0061] Further, see Figure 3 and Figure 4 , the connecting shaft 421 is sleeved with a sleeve 422, and the sleeve 422 is used to contact the support rod 540. It can be understood that the setting of the sleeve 422 can effectively prevent the connecting shaft 421 from being worn, thereby increasing the service life of the compaction assembly 400. Optionally, a retaining ring 423 is provided at one end of the connecting shaft 421 away from the sleeve 422, and the retaining ring 423 and the sleeve 422 are spaced apart, and the connecting shaft 421 between the retaining ring 423 and the sleeve 422 is used to be plugged into the slot 321.

[0062] Further, see Figure 3 A limiting member 550 is connected to one side of the mounting plate 310, and the hammer rod 520 abuts against the limiting member 550, and the limiting member 550 is used to prevent the hammer rod 520 from rotating in the reverse direction. By setting the limiting member 550 to support the hammer rod 520, the support rod 540 can stably support the connecting shaft 421.

[0063] Further, Figure 5 The structure diagram of the compacting hammer 440 according to the embodiment of the present invention at a certain viewing angle is schematically shown. Figure 6 The structural diagram of the compacting hammer 440 according to the embodiment of the present invention is schematically shown from another perspective. Figure 7 Schematically shows a structural diagram of a working block according to an embodiment of the present invention. Figures 4 to 7The compacting assembly 400 further includes a compacting hammer 440, which is slidably connected to the guide rod 410. The compacting hammer 440 can move downward along the guide rod 410 to hammer the compacting head 430. Figure 1 and Figure 2 The Marshall compaction instrument further includes a drive assembly 800 and a transmission assembly 900. The transmission assembly 900 includes a transmission chain 930. The transmission chain 930 is provided with a drive block 931. The compaction hammer 440 is provided with a working block 441. 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. During the rising process, the drive block 931 can resist the working block 441 to move the compaction hammer 440 upward. Optionally, the drive assembly 800 includes a motor, and the transmission assembly 900 also includes a driving sprocket 910 and a driven sprocket 920. The driving sprocket 910 and the driven sprocket 920 are connected in transmission through the transmission chain 930. The motor is connected to a driving gear, and the transmission assembly 900 also includes a driven gear that is coaxially driven with the driving sprocket 910. The driving gear and the driven gear are connected in transmission. During the working process, the motor drives the driving gear to rotate, and the driving gear drives the driven gear to rotate. The driving sprocket 910 and the driven gear rotate synchronously, and drive the transmission chain 930 and the driven gear to rotate. When the driving block 931 rotates to the bottom of the working block 441 and abuts against the working block 441, the driving block 931 continues to move upward and drives the compacting hammer 440 to move upward. When the driving block 931 continues to rotate until it is separated from the working block 441, the compacting hammer 440 performs free fall motion along the guide rod 410, thereby hammering the compacting head 430.

[0064] Optionally, two driving blocks 931 are provided, and the two driving blocks 931 are respectively located on both sides of the moving direction of the transmission chain 930. A sensing component is provided on the driving block 931, and a proximity switch is provided on the chassis 200 at the position where the driving block 931 and the working block 441 are separated. The proximity switch counts after sensing the sensing component, and after completing a preset number of hammer strikes, the test mold assembly 600 is removed.

[0065] Further, see Figure 7, the working block 441 includes a support portion 4411, and the support portion 4411 includes two sheet structures 4411a arranged at intervals along the vertical direction (the falling direction of the hammer 440). When the driving block 931 rises, it can resist the sheet structure 4411a to move the hammer 440 upward. Since there is a certain interval between the two sheet structures 4411a, when the driving block 931 and the working block 441 are in contact, it can play a role in shock absorption. Exemplarily, the working block 441 also includes a working block 441 body, and the support portion 4411 and the working block 441 body are integrally formed. There are two support portions 4411, and the two support portions 4411 are arranged at intervals and correspond to the two driving blocks 931 one by one. The working block 441 body is penetrated by the hammer 440, and the two support portions 4411 are connected to the working block 441 body and are arranged in the direction of the driving block 931. In some embodiments, the support portion 4411 can also be block-shaped.

[0066] During the specimen forming process, the hammer 440 should fall freely from the set height. Dropping the hammer means that the hammer 440 fails to fall normally or an abnormality occurs during the falling process, which can easily cause inaccurate test results. In this embodiment, the motor is arranged at the top of the entire device, so that during use, the transmission chain 930 close to the hammer 440 is stressed, thereby avoiding the disadvantage of the far-end transmission chain 930 being stressed when the motor is at the bottom, resulting in the hammer dropping.

[0067] Further, see Figure 5 and Figure 6 The hammer 440 is provided with a guide hole 442 extending in the vertical direction, and the inner wall of the guide hole 442 is provided with a plurality of grooves extending in the vertical direction, and the plurality of grooves are arranged at intervals along the circumference of the guide hole 442. The guide rod 410 is passed through the guide hole 442, and the hammer 440 is slidably connected to the guide rod 410 through the guide hole 442. By providing a plurality of grooves extending in the vertical direction 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 the friction between the hammer 440 and the guide rod 410, avoiding energy loss, and ensuring the accuracy of the hammering force.

[0068] Optionally, the hammer 440 is further provided with a limiting hole 443 extending in the vertical direction, and the limiting hole 443 is connected to the guide hole 442. A wedge block 450 is connected to the guide rod 410, and the thinner end of the wedge block 450 faces the bottom of the guide rod 410. The limiting hole 443 on the hammer 440 faces the wedge block 450. When the hammer 440 moves upward, the wedge block 450 can be plugged into the limiting hole 443, thereby limiting the falling height of the hammer 440.

[0069] Further, Figure 8Schematically shows a partial structural cross-sectional view of a compaction assembly 400 according to an embodiment of the present invention. Figure 8 The compacting head 430 includes a first compacting part 431 and a second compacting part 432. The first compacting part 431 has a cavity that passes through in the vertical direction. The guide rod 410 is inserted into the cavity. The first compacting part 431 can reciprocate along the guide rod 410. A second spring 433 is arranged inside the cavity. The second spring 433 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 compacting part 431, and the bottom of the second spring 433 abuts against the fastener 434. The second compacting part 432 is connected to the bottom of the first compacting part 431. When the compacting hammer 440 moves downward along the guide rod 410 to hammer the first compacting part 431, the second spring 433 contracts, and the second compacting part 432 hammers the material to be formed. It is understandable that when the hammer 440 moves away from the first compacting part 431, the first compacting part 431 moves upward under the action of the restoring force of the second spring 433. This structure can play a buffering role and reduce vibration during the hammering process of the compacting hammer 440 on the compacting head 430.

[0070] 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 an axial end stopper 435, a gasket 436 is provided between the axial end stopper 435 and the nut, and a cotter pin 437 is provided at the bottom of the nut. By sleeve-arranging the cotter pin 437 on the guide rod 410 and making the cotter pin 437 abut against the nut, the nut can be effectively prevented from rotating.

[0071] Further, Fig. 9 Schematically shows Figure 1 The partial enlarged view of the B in the figure. The test mold assembly 600 includes a sleeve 610, a test mold body 620 and a test mold base 630 which are stacked in sequence. A positioning protrusion is provided on the end surface of the base 100, and a positioning groove is provided at the bottom of the test mold base 630. The positioning protrusion is used to be plugged into the positioning groove. The test mold body 620 and the test mold base 630 form a receiving cavity for placing the material to be molded. The test mold assembly 600 is pressed against the base 100 through the sleeve 610.

[0072] In the prior art, the test mold base 630 and the base 100 are usually connected by screws. As the test proceeds, the vibration generated easily causes the screws to loosen. After multiple test pieces are formed, the placement position of the test mold assembly 600 is easily offset. After the hammer 440 falls, it rubs against the inner wall of the test mold body 620, resulting in a non-standard Marshall test piece. In addition, the connection positions of the test mold base 630 and the base 100 for the large Marshall test piece and the standard Marshall test piece are different. When the large Marshall test piece and the standard Marshall test piece need to be formed at the same time, the screw position needs to be frequently changed, resulting in reduced work efficiency. In the present technical solution, the positioning of the test mold base 630 and the base 100 is achieved by positioning the positioning groove and the positioning protrusion, which can effectively prevent the test mold assembly 600 from being offset due to vibration during the working process. In addition, during use, the test mold base 630 can be placed on the base 100, which is easy to operate and helps to improve the test efficiency. Optionally, the positioning groove is circular and is concentrically arranged with the test mold base 630. Correspondingly, the positioning protrusion is a circular protrusion.

[0073] Furthermore, a convex rib 611 is provided on the outer periphery of the sleeve 610, and the Marshall compactor also includes two groups of locking assemblies 700, which are respectively arranged on both sides of the test mold assembly 600, and the locking assembly 700 includes a guide rod 710, a first spring 730 and a pressure block 740. The top of the guide rod 710 is connected with an abutment 720, and 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 move back and forth along the axial direction of the guide rod 710, and the pressure block 740 is used to press the convex rib 611. In this embodiment, the rib 611 and the sleeve 610 are integrally formed, and the rib 611 and the sleeve 610 are combined into a whole, so that the test mold assembly 600 is changed from four parts in the prior art to three parts, namely, the sleeve 610, the test mold body 620 and the test mold base 630, so that the process of replacing the test mold assembly 600 is simpler. Optionally, the rib 611 can be located at the top of the sleeve 610, or at the middle of the sleeve 610.

[0074] Further, Fig.10 The schematic diagram of the structure of the locking assembly 700 according to the embodiment of the present invention is schematically shown. The guide rod 710 is rotatably connected with a rotating block 750, which is located at the bottom of the pressing block 740 and abuts against the pressing 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 make the pressing block 740 move downward under the action of the restoring force of the first spring 730 and press the convex rib 611.

[0075] In this embodiment, the rotating block 750 is a cylindrical block structure, and the rotation center of the rotating block 750 does not coincide with the circle of the rotating block 750, so that the distance from the edge of the rotating block 750 to the rotation center of the rotating block 750 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, and the rotating block 750 can be rotated by rotating the locking handle 760. The rotation of the rotating block 750 can move the pressing block 740 downward or upward, thereby pressing or loosening the trial mold assembly 600.

[0076] The use process of the Marshall compaction instrument provided by this technical solution is as follows:

[0077] When the compaction assembly 400 needs to be replaced, the limiting piece 330 on the support plate 320 and the stopper 340 on the mounting plate 310 are removed, and the guide rod 410 is held to move the compaction assembly 400 upward so that the connecting shaft 421 is removed from the slot 321. The guide rod 410 of the compaction assembly 400 to be replaced is inserted into the avoidance gap and the connecting shaft 421 is inserted into the slot 321, and the replacement of the compaction assembly 400 is completed.

[0078] When the test mold assembly 600 needs to be replaced, the locking handle 760 is first rotated to move the pressing block 740 away from the rib 611 on the sleeve 610. Then, the end of the lifting hammer rod 520 is lifted upward, so that the support rod 540 drives the connecting shaft 421 to move upward, so that the compacting head 430 is away from the test mold assembly 600, and the test mold assembly 600 can be removed. When the test mold assembly 600 is placed, the lifting hammer rod 520 is lifted to move the compacting 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, and the test mold body 620 and the sleeve 610 are stacked in sequence, and the lifting hammer rod 520 is released to make the compacting head 430 fall down. Finally, the rotating block 750 is rotated by the locking handle 760 to move the pressing block 740 downward to press the rib 611 on the sleeve 610. When it is necessary to add the material to be formed into the interior of the trial mold body 620 , the compacting head 430 can also be moved away from the trial mold assembly 600 by lifting the hammer rod 520 .

[0079] When compacting materials is required, the motor is started, the motor drives the driving gear to rotate, the driving gear drives the driven gear to rotate, the driving sprocket 910 and the driven gear rotate synchronously, and drive the transmission chain 930 and the driven gear to rotate, when the driving block 931 rotates to the bottom of the working block 441 and abuts against the working block 441, the driving block 931 continues to move upward and drives the compacting hammer 440 to move upward, when the driving block 931 continues to rotate until it is separated from the working block 441, the compacting hammer 440 performs free fall along the guide rod 410, thereby hammering the compacting head 430. The proximity switch counts after sensing the sensing component, and after completing the preset number of hammering, the test mold assembly 600 is removed.

[0080] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A Marshall compaction instrument, characterized in that: include: Base (100); A chassis (200), the chassis (200) being connected to the base (100); A mounting assembly (300), the mounting assembly (300) being connected to the top of the chassis (200); A plurality of trial mold assemblies (600), wherein the trial mold assemblies (600) are placed on the base (100) and are used to accommodate materials to be molded; A plurality of compaction assemblies (400) are provided, wherein the compaction assemblies (400) include a guide rod (410) and a compaction head (430), wherein the guide rod (410) is arranged in a vertical direction, and a connection structure (420) is arranged at the top of the guide rod (410), and the connection structure (420) and the mounting assembly (300) are detachably connected; and 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.

2. The Marshall compaction apparatus according to claim 1, characterized in that: The mounting assembly (300) comprises a mounting plate (310) and two support plates (320), the mounting plate (310) being provided with an avoidance notch for allowing the guide rod (410) to pass through, the support plate (320) being arranged in a vertical direction and connected to the mounting plate (310), the two support plates (320) being respectively located on both sides of the avoidance notch, the support plate (320) being provided with a slot (321) extending in the vertical direction, the connection structure (420) comprising two connection shafts (421), the two connection shafts (421) being respectively located on both sides of the guide rod (410), and the two connection shafts (421) being respectively used for plugging into the slots (321) on the two support plates (320).

3. The Marshall compaction instrument according to claim 2, characterized in that: The Marshall compaction instrument also includes a lifting hammer assembly (500), and the lifting hammer assembly (500) includes a mounting seat (510), a lifting hammer rod (520), a rotating shaft (530) and a supporting rod (540). The mounting seat (510) is connected to the top of the mounting plate (310), and the rotating shaft (530) is rotatably arranged on the mounting seat (510). The lifting hammer rod (520) and the supporting rod (540) are respectively connected to the two ends of the rotating shaft (530), and one end of the supporting rod (540) away from the rotating shaft (530) is used to support the connecting shaft (421). The forward rotation of the lifting hammer rod (520) can drive the supporting rod (540) to rotate forward, and the forward rotation of the supporting rod (540) can make the connecting shaft (421) move upward along the slot (321).

4. The Marshall compaction instrument according to any one of claims 1 to 3, characterized in that: The trial mold assembly (600) comprises a sleeve (610), a trial mold body (620) and a trial mold base (630) which are stacked in sequence; a positioning protrusion is arranged on the end surface of the base (100); a positioning groove is arranged at the bottom of the trial mold base (630); the positioning protrusion is used to be plugged into and matched 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 against the base (100) through the sleeve (610).

5. The Marshall compaction instrument according to claim 4, characterized in that: The outer periphery of the sleeve (610) is provided with a convex rib (611). The Marshall compaction instrument also includes two groups of locking assemblies (700), which are respectively arranged on both sides of the test mold assembly (600). The locking assembly (700) includes a guide rod (710), a first spring (730) and a pressure block (740). The top of the guide rod (710) is connected with an abutment member (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 member (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), and the pressure block (740) is used to press the convex rib (611).

6. The Marshall compaction instrument according to claim 5, characterized in that: The guide rod (710) is rotatably connected to a rotating block (750), and the rotating block (750) is located at the bottom of the pressing block (740) and abuts against the pressing 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 enable the pressing block (740) to move downward and press the convex rib (611) under the action of the restoring force of the first spring (730) itself.

7. The Marshall compaction apparatus according to any one of claims 1 to 3, characterized in that: The compacting assembly (400) further comprises a compacting hammer (440), wherein the compacting hammer (440) is slidably connected to the guide rod (410), and the compacting hammer (440) can move downward along the guide rod (410) to hammer the compacting head (430).

8. The Marshall compaction apparatus according to claim 7, characterized in that: The Marshall compactor further comprises a driving assembly (800) and a transmission assembly (900), wherein the transmission assembly (900) comprises a transmission chain (930), wherein a driving block (931) is arranged on the transmission chain (930), wherein a working block (441) is arranged on the compacting hammer (440), wherein the working block (441) comprises a supporting portion (4411), wherein the supporting portion (4411) comprises two sheet structures (4411a) arranged at intervals in a vertical direction, wherein the driving assembly (800) is used for driving the transmission chain (930) to rotate, wherein the rotation of the transmission chain (930) can drive the driving block (931) to rise, and when the driving block (931) rises, it can resist the sheet structure (4411a) to move the compacting hammer (440) upward.

9. The Marshall compaction instrument according to claim 7, characterized in that: The hammer (440) is provided with a guide hole (442) extending in the vertical direction, and the inner wall of the guide hole (442) is provided with a plurality of grooves extending in the vertical direction, and the plurality of grooves are arranged at intervals along the circumference of the guide hole (442). The guide rod (410) passes through the guide hole (442), and the hammer (440) is slidably connected to the guide rod (410) through the guide hole (442).

10. The Marshall compactor according to claim 9, characterized in that: The compacting head (430) comprises a first compacting part (431) and a second compacting part (432), the first compacting part (431) having a cavity penetrating in a vertical direction, the guide rod (410) being arranged in the cavity, the first compacting part (431) being capable of reciprocating along the guide rod (410), a second spring (433) being arranged inside the cavity, the second spring (433) being sleeved on the guide rod (410), the bottom of the guide rod (410) being connected to a fastener (433). 34), the top of the second spring (433) abuts against the top of the first compacting part (431), the bottom of the second spring (433) abuts against the fastener (434), the second compacting part (432) is connected to the bottom of the first compacting part (431), and when the compacting hammer (440) moves downward along the guide rod (410) to hammer the first compacting part (431), the second spring (433) contracts, and the second compacting part (432) hammers the material to be formed.

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