A dual-knife asphalt concrete test specimen cutter

Abstract

The application discloses a double-knife asphalt concrete test piece cutting machine, which comprises a supporting system, a cutting system and a control system; the height-adjustable cutting system is arranged on the supporting system and is used for cutting the asphalt concrete test piece; the horizontally movable sample feeding system is further arranged on the supporting system and is located below the cutting system and is used for pushing the asphalt concrete sample to be cut to the cutting system; and the control system is used for controlling the start or stop of the cutting work of the cutting system and is used for controlling the movement or stop of the sample feeding system position. The application has the advantages of simple structure, novel and reasonable design, convenient operation, high automation degree of the whole cutting process, uniform sample feeding process speed, reduced error, improved asphalt concrete test piece quality, fast distance adjustment speed between the knives, improved work efficiency, clamping of various styles of asphalt concrete samples, wide application range and universal promotion.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cutting, and particularly relates to a double-knife asphalt concrete test piece cutting machine. BACKGROUND

[0002] In building engineering, when the performance and index of asphalt concrete are tested, small beam bending, four-point bending fatigue life, bending creep and linear shrinkage coefficient tests of asphalt mixture need to be completed. Before the related tests are carried out, fixed standard specification asphalt concrete test pieces need to be provided, and the test pieces are required to have smooth surfaces and flat end faces, and the size deviation is not greater than ±1mm. In order to ensure the accuracy and repeatability of the related tests, the cutting process of the test pieces is particularly important.

[0003] At present, the cutting machines for cutting asphalt concrete test pieces mainly adopt single-knife cutting machines and double-knife cutting machines, and the two kinds of cutting machines have the following problems:

[0004] 1. The single-knife cutting machine needs to be manually measured by a steel ruler and the like before cutting, and then the cutting size is marked on the test piece. Since there is an error in the measurement and marking of the size, the precision requirement of the size of the test piece cannot be met, and the work efficiency is low. Moreover, when cutting, the single-knife cutting machine will vibrate to a large extent, so that the cutting surface is not flat, and the parallelism of the cutting surface cannot be guaranteed.

[0005] 2. The existing double-knife cutting machines are mainly of the fixed size type of cutter head. The size range of the asphalt concrete samples that can be cut by this kind of cutting machine is small. The fixture of this cutting machine is relatively single, and cannot clamp some test pieces with special size and shape requirements, and the adaptability is insufficient.

[0006] 3. The distance between the two knives of part of the double-knife cutting machines can be adjusted by replacing the limiting snap rings with different thicknesses between the knives, but the replacement process is complex, and the safety factor is low. When the sample is fed into the cutting machine, the operator needs to manually push the sample to be cut into the lathe and press the cutting saw blade, and the feeding speed is uneven, so that the surface of the cut test piece has uneven fractures, and the requirement of the flat end face of the asphalt concrete test piece cannot be met.

[0007] In order to improve the precision of the cutting machine and make the asphalt concrete test piece meet the experimental specifications, it is necessary to design a multifunctional asphalt concrete test piece cutting machine which can quickly adjust the distance between the knives, automatically and uniformly feed the sample, has high cutting size precision, and is safe and reliable. SUMMARY

[0008] The purpose of the present application is to provide a double-knife asphalt concrete test piece cutting machine, which is simple in structure, novel and reasonable in design, easy to operate, high in automation degree in the whole cutting process, uniform in sample feeding process speed, low in error, and high in asphalt concrete test piece quality; the distance between the knives can be adjusted at a high speed, thereby improving the work efficiency; and the machine can clamp asphalt concrete samples of various styles, is wide in application range, and is suitable for popularization.

[0009] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0010] A double-knife asphalt concrete test piece cutting machine comprises a support system, a cutting system, and a control system.

[0011] The cutting system is arranged on the support system and is used for cutting asphalt concrete test pieces; the sample feeding system is horizontally movable and is arranged below the cutting system and used for feeding the asphalt concrete samples to be cut to the cutting system.

[0012] The control system is used for controlling the start or stop of the cutting work of the cutting system and the movement or stop of the position of the sample feeding system.

[0013] The double-knife asphalt concrete test piece cutting machine has the following characteristics: the cutting system comprises a cutting mechanism and a first power mechanism, and the first power mechanism is used for driving the cutting mechanism.

[0014] The first power mechanism comprises a cutting motor, a first transmission wheel, and a second transmission wheel, the output shaft of the cutting motor is connected with the first transmission wheel, and the first transmission wheel and the second transmission wheel are driven through a transmission belt.

[0015] The cutting mechanism comprises a composite transmission shaft, a limiting ring, a first knife disc, and a second knife disc; one end of the composite transmission shaft is connected with the second transmission wheel, the other end of the composite transmission shaft is provided with a thread, the first knife disc and the second knife disc are arranged on the thread, and the limiting ring is arranged between the first knife disc and the second knife disc.

[0016] The outer part of the composite transmission shaft is provided with a shaft sheath, the shaft sheath is fixedly connected with the support system, and a bearing is arranged between the shaft sheath and the composite transmission shaft.

[0017] The double-knife asphalt concrete test piece cutting machine has the following characteristics: a lubricating device is arranged on the support system and used for lubricating the bearing, the lubricating device comprises an oil cup and an oil pipe, an oil pipe interface is arranged on the shaft sheath, the oil cup is connected in sequence through the oil pipe, the oil pipe interface, and the bearing, and the oil cup is arranged on the support system.

[0018] The above-mentioned double-blade asphalt concrete specimen cutting machine is characterized in that the support system includes: a frame and a vertically arranged head support, and the frame and the head support are connected as a whole;

[0019] A vertical sliding device is provided on the head support, and the sliding device includes: a vertical track, a fixed block, a connecting plate, a cutter head fixing frame, a height adjusting screw and a track locking bolt; the fixed block is fixedly arranged on the head support, the fixed block is slidably arranged in the vertical track, and the vertical track is fixedly arranged on the cutter head fixing frame; the connecting plate is arranged at the top end of the vertical track, the height adjusting screw passes through the connecting plate and the fixed block, and the fixed block is fixedly connected to the vertical track through the track locking bolt; the height adjusting screw is used to adjust the height of the cutter head fixing frame, and the track locking bolt is used to fix the position of the adjusted cutter head fixing frame;

[0020] A cutting motor and a composite transmission shaft are arranged on the cutter head fixing frame, and the composite transmission shaft is located below the cutting motor; a cutter head cover is arranged on the side of the cutter head fixing frame, and the cutter head cover is arranged above the first cutter head and the second cutter head.

[0021] The above-mentioned double-blade asphalt concrete specimen cutting machine is characterized in that a sample feeding system is arranged on the frame, and the sample feeding system includes: a horizontal track, a connecting mechanism, a sample feeding mechanism and a second power mechanism;

[0022] The horizontal track is arranged on the upper surface of the frame and below the cutting mechanism; four track wheels are slidably arranged on the horizontal track;

[0023] The sample feeding mechanism includes: a loading platform; a backing strip and a pressing strip are arranged on the loading platform;

[0024] The connecting mechanism includes: four connecting brackets, and the four connecting brackets are correspondingly arranged below the four corners of the bottom of the loading platform; the connecting bracket includes: a vertical plate and a bracket plate, the bracket plate is a structure with a "channel" cross-section, the bottom of the "L" side in the "channel" structure is connected to the bottom of the vertical plate, and the vertical plate is fixedly connected to the side of the loading platform; a track wheel is correspondingly arranged below each connecting bracket; a track protection cover is arranged on the top of the bracket plate;

[0025] The second power mechanism includes: a sample feeding motor and a planetary reducer; the output shaft of the sample feeding motor is connected to the connecting end of the planetary reducer, and the power output shaft of the planetary reducer is传动连接 to a track wheel.

[0026] It should be noted that there is an error in the original text where "传动连接" is used in Chinese in line 21. It should be "drivably connected" in English. The corrected translation is as follows: The above-mentioned double-blade asphalt concrete specimen cutting machine is characterized in that the support system includes: a frame and a vertically arranged head support, and the frame and the head support are connected as a whole;

[0019] A vertical sliding device is provided on the head support, and the sliding device includes: a vertical track, a fixed block, a connecting plate, a cutter head fixing frame, a height adjusting screw and a track locking bolt; the fixed block is fixedly arranged on the head support, the fixed block is slidably arranged in the vertical track, and the vertical track is fixedly arranged on the cutter head fixing frame; the connecting plate is arranged at the top end of the vertical track, the height adjusting screw passes through the connecting plate and the fixed block, and the fixed block is fixedly connected to the vertical track through the track locking bolt; the height adjusting screw is used to adjust the height of the cutter head fixing frame, and the track locking bolt is used to fix the position of the adjusted cutter head fixing frame;

[0020] A cutting motor and a composite transmission shaft are arranged on the cutter head fixing frame, and the composite transmission shaft is located below the cutting motor; a cutter head cover is arranged on the side of the cutter head fixing frame, and the cutter head cover is arranged above the first cutter head and the second cutter head.

[0021] The above-mentioned double-blade asphalt concrete specimen cutting machine is characterized in that a sample feeding system is arranged on the frame, and the sample feeding system includes: a horizontal track, a connecting mechanism, a sample feeding mechanism and a second power mechanism; <The double-knife asphalt concrete test piece cutting machine has the characteristics that a plurality of clamps are arranged in the sample feeding system, the clamps are used for clamping the cylindrical asphalt concrete sample, and the clamp comprises a handle, a screw rod, a top head and a clamp support.

[0027] The upper part of the clamp support is horizontally provided with the screw rod, one end of the screw rod is provided with the handle, and the other end is provided with the arc-shaped top head used for abutting against the asphalt concrete sample to prevent the asphalt concrete sample from moving.

[0028] The double-knife asphalt concrete test piece cutting machine has the characteristics that the circuit of the control system is divided into a high-voltage circuit part and a low-voltage circuit part.

[0029] The high-voltage circuit part comprises a cutting motor contactor, a thermal protection relay and a frequency converter, the cutting motor contactor and the thermal protection relay are used for controlling the normal operation of the cutting motor, and the frequency converter is used for controlling the rotating speed and direction of the sample feeding motor.

[0030] The low-voltage circuit part comprises a power switch, an advance button, a retreat button, a first intermediate relay, a second intermediate relay, a time relay, a start point proximity switch and an end point proximity switch, the frequency converter controls the sample feeding motor to realize forward rotation through the advance button, the time relay and the first intermediate relay, and controls the sample feeding motor to realize reverse rotation through the retreat button, the second intermediate relay, the start point proximity switch and the end point proximity switch are used for sensing the position of the loading table and realizing the disconnection or connection of the circuit, the start point proximity switch is arranged at the start point end of the horizontal track, and the end point proximity switch is arranged at the end point end of the horizontal track.

[0031] The double-knife asphalt concrete test piece cutting machine has the characteristics that a movable limit switch is arranged between the start point proximity switch and the end point proximity switch, and the movable limit switch is arranged on the side edge of the rack.

[0032] The structure of the movable limit switch comprises a movable proximity switch, a locking screw rod, a top plate and a U-shaped fixed clamping groove, the fixed clamping groove is clamped on the side edge of the rack, the inner side surface of the fixed clamping groove is provided with the top plate, the locking screw rod penetrates from one side of the fixed clamping groove and is connected with the top plate, a fixed baffle is vertically arranged on the surface of the other side of the fixed clamping groove, the movable proximity switch is arranged on the fixed baffle, a limiting column is arranged beside the sensing head of the movable proximity switch, and the limiting column is used for protecting the movable proximity switch from being damaged.

[0033] The double-blade asphalt concrete test piece cutting machine has a cooling system, which comprises a water pump and a water pipe, the water inlet end of the water pump is communicated with a water supply pipe, and the water outlet end of the water pump is communicated with the water pipe; the water flow sprayed by the water pipe is used for cooling the first cutter head and the second cutter head.

[0034] The double-blade asphalt concrete test piece cutting machine has a composite transmission shaft, which comprises an inner transmission shaft and an outer transmission shaft, both of which are hollow shafts, the inner transmission shaft is inserted into the outer transmission shaft, both ends of the inner transmission shaft extend out of the outer transmission shaft, one end of the inner transmission shaft is provided with the first cutter head and the second cutter head, and the end of the outer transmission shaft away from the first cutter head and the second cutter head is in transmission connection with the second transmission wheel.

[0035] The middle section of the outer surface of the inner transmission shaft is provided with a spline, the middle section of the inner surface of the outer transmission shaft is provided with a spline groove, the spline and the spline groove are in rotational cooperation, both ends of the spline and the spline groove are respectively provided with a limiting steel ring, and both ends of the inner transmission shaft and the outer transmission shaft are fixedly connected.

[0036] The double-blade asphalt concrete test piece cutting machine has two limiting rings, which are a first limiting ring and a second limiting ring, the outer side of one end of the inner transmission shaft close to the second transmission wheel is sleeved with the first limiting ring, and the second limiting ring is arranged between the first cutter head and the second cutter head.

[0037] The hollow shaft of the inner transmission shaft is a main oil path, one end of the main oil path is provided with an adjusting switch, the other end of the main oil path is provided with an oil filling port, the oil filling port is provided with a one-way valve, a first lower branch oil path is arranged on the upper part of one end of the inner transmission shaft close to the adjusting switch, and a second lower branch oil path is arranged on the upper part of one end of the inner transmission shaft close to the oil filling port.

[0038] The adjusting switch comprises a hollow bolt, a long rod bolt and a sealing plug, the long rod bolt passes out from the inside of the hollow bolt, the inner surface of the hollow bolt is provided with a thread, the long rod bolt is in threaded connection with the hollow bolt, the sealing plug is arranged in the main oil path at the lower end of the first lower branch oil path, a communication hole for connecting both ends of the main oil path is arranged on the sealing plug, and the long rod bolt is hingedly connected with the sealing plug.

[0039] The first limiting ring and the second limiting ring are essentially micro annular hydraulic cylinders, which comprise a fixed ring and a moving ring, and the fixed ring and the moving ring are both sleeved on the outside of the inner transmission shaft.

[0040] The fixed ring is internally provided with an annular chamber and an upper oil passage; the annular chamber and the upper oil passage are arranged inside the fixed ring body; the annular chamber and the upper oil passage are communicated, the upper oil passage and a corresponding lower oil passage on the inner transmission shaft are communicated; the opening of the upper oil passage is provided with a sealing bolt;

[0041] The moving ring is provided with an annular piston, which cooperates with the annular chamber to perform piston movement; the contact position of the annular chamber and the annular piston is provided with a sealing rubber ring;

[0042] The connecting position of the fixed ring and the moving ring is provided with a sealing steel ring;

[0043] The moving ring of the first limiting ring is connected to the outer side of the outer transmission shaft, and the moving ring of the second limiting ring is connected to the first cutter head.

[0044] Compared with the prior art, the present application has the following advantages:

[0045] 1. The structure of the present application is simple and novel and reasonable.

[0046] 2. The cutting system is set to a height-adjustable structure, which is convenient for adjusting the height of the cutting system according to the thickness of the asphalt concrete sample, so that the cutting system is located at the most suitable cutting position and cutting angle; the starting or stopping of the cutting work of the cutting system, the movement or stopping of the position of the sample feeding system are controlled by the control system, so that the movement speed and cutting rate of the asphalt concrete sample can be accurately controlled, the edge line of the cut asphalt concrete sample is smooth, the end face is flat, the size accuracy is high, and the quality of the asphalt concrete sample is effectively improved; and the cutting process has high automation degree, reduces the degree of manual participation, and can greatly improve the work efficiency.

[0047] 3. The sliding device of the vertical rail, the fixed block, the connecting plate, the cutter head fixing frame, the height adjusting screw and the rail locking bolt is arranged on the machine head support, so that the vertical rail slides relative to the fixed block with the up and down movement of the threads on the height adjusting screw, and the position is fixed by the rail locking bolt after the height is adjusted, so that the position of the cutter head cannot slide again. This structure can adapt to asphalt concrete samples of different thicknesses, and the structure design is novel and the adjustment effect is good.

[0048] 4、The sample feeding system composed of a carrier table, a pressing strip, a ruler, a horizontal track, a support plate, a track wheel, a sample feeding motor, a planetary reducer and the like ensures that the asphalt concrete sample moves at a constant speed along the horizontal track on the carrier table, and deviation does not occur during the movement, so that the cutting size error is reduced and the quality of the asphalt concrete test piece is improved.

[0049] 5、The sample feeding system further comprises clamps for clamping the cylindrical asphalt concrete sample, which are arranged on opposite sides or multiple positions of the carrier table, so that the cylindrical asphalt concrete sample is clamped firmly and movement of the sample is prevented, facilitating the subsequent cutting work.

[0050] 6、The control system composed of a frequency converter, a forward button, a backward button, a first intermediate relay, a second intermediate relay, a time relay, a start proximity switch and an end proximity switch, wherein the frequency converter is used to control the forward and reverse movement directions of the sample feeding motor, so as to control the moving speed and direction of the carrier table; during the movement, the carrier table moves at a constant speed along the horizontal track, ensuring the cutting quality of the asphalt concrete test piece, and the cutting process is highly automated, improving the cutting efficiency and reducing the safety risk during use.

[0051] 7、The main oil path, the lower oil path, the annular chamber and the annular piston are designed in the inner transmission shaft and the limiting ring, respectively, and pressure or tension is applied to the port of the composite transmission shaft, so that the oil enters the main oil path or the upper oil path, the annular chamber and the annular piston are caused to move, the distance between the fixed ring and the moving ring in the limiting ring is changed, the first cutter head and the second cutter head are infinitely telescopic and adjustable in distance, the design is novel, the operation is simple, time and labor are saved, and the work efficiency is greatly improved.

[0052] 8、The present application has low implementation cost, good use effect and is convenient to popularize and use.

[0053] In summary, the present application has simple structure, novel and reasonable design, is convenient to operate, has high automation degree in the whole cutting process, uniform speed in the sample feeding process, reduced error and improved quality of the asphalt concrete test piece; the distance between the cutter heads is adjusted at a high speed, improving the work efficiency; the present application can clamp asphalt concrete samples of various styles, has wide application range and is suitable for universal promotion.

[0054] The technical solutions of the present application will be further described in detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0056] Figure 1 It is a structural schematic diagram of a double-knife asphalt concrete test piece cutting machine of the present application.

[0057] Figure 2 It is a structural schematic diagram of a cutting system of the present application. Figure 1

[0058] Figure 3 It is a structural schematic diagram of a cutting mechanism and a composite transmission shaft in Example 1.

[0059] Figure 4 It is a structural schematic diagram of a composite transmission shaft of the present application. Figure 3

[0060] It is a structural schematic diagram of a sample feeding system in the present application. Figure 5 Figure 1 It is a structural schematic diagram of a cylindrical asphalt concrete sample clamp.

[0061] Figure 6 It is a circuit diagram of the control system of the present application.

[0062] Figure 7 It is a structural schematic diagram of a mobile limiter.

[0063] Figure 8 It is a structural schematic diagram of a cutting mechanism and a composite transmission shaft in Example 2.

[0064] Figure 9 It is a structural schematic diagram of a cutting cutter head and a composite transmission shaft in the present application.

[0065] Figure 10 Figure 9 It is a structural schematic diagram of an inner transmission shaft in the present application.

[0066] Figure 11 It is a structural schematic diagram of an outer transmission shaft in the present application. Figure 10

[0067] It is a sectional view of the outer transmission shaft in the present application. Figure 12 Figure 10 It is a sectional view and a partial enlarged view of the present application.

[0068] Figure 13 Figure 11 It is a sectional view and a partial enlarged view of the present application.

[0069] Figure 14 It is a sectional view and a partial enlarged view of the present application.​​​​​Figure 10 Cross-sectional view of the middle limiting ring.

[0070] Legend:

[0071] 1 - first power mechanism, 1a - cutting motor, 1b - first transmission wheel,

[0072] 1c - second transmission wheel, 1d - transmission belt; 2 - water pipe;

[0073] 3 - cutting mechanism, 3a - cutter cover, 3b - first cutter,

[0074] 3c - second cutter; 4 - horizontal rail, 4a - rail wheel,

[0075] 4b - rail guard cover; 5 - support system, 5a - head support

[0076] 5b - frame, 5c - vertical rail, 5d - fixed block,

[0077] 5e - connecting plate, 5f - cutter head fixing frame, 5g - height adjusting screw,

[0078] 5h - rail locking bolt; 6 - object carrier, 6a - ruler,

[0079] 6b - pressing strip, 6c - clamp, 6ca - handle,

[0080] 6cb - lead screw, 6cc - top head, 6cd - clamp support;

[0081] 7 - connecting support, 7a - vertical plate; 7b - support plate;

[0082] 8 - composite transmission shaft, 8a - shaft sheath, 8b - one-way valve;

[0083] 8c - adjusting switch, 8ca - hollow bolt, 8cb - long rod bolt,

[0084] 8cc - sealing plug, 8cd - communication hole, 8d - key,

[0085] 8cc - sealing plug, 8d - key, 8e - inner transmission shaft,

[0086] 8e - inner transmission shaft, 8ed - second lower oil passage, 8f - outer transmission shaft,

[0087] 8fa - spline groove, 8fb - limiting steel ring, 8g - oil filling port,

[0088] 9 - limiting ring, 9a - fixed ring, 9aa - annular chamber,

[0089] 9ab - upper oil passage, 9ac - hollow sealing bolt, 9ad - sealing bolt,

[0090] 9ae - sealing rubber ring, 9b - moving ring, 9ba - annular piston,

[0091] 9bb - sealing steel ring; 10 - start proximity switch; 11 - end proximity switch;

[0092] 12 - movable stopper, 12a - movable proximity switch, 12b - locking screw rod,

[0093] 12c - fixed clamping groove, 12d - top plate, 12e - limiting column;

[0094] 13 - oil pipe; 14 - oil cup; 15 - sample feeding motor;

[0095] 16 - planetary reducer; 17 - frequency converter; KM1 - cutting motor contactor;

[0096] FR1 - thermal protection relay; KA1 - first intermediate relay; KA2 - second intermediate relay;

[0097] KT - time relay. DETAILED DESCRIPTION

[0098] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the present application.

[0099] Embodiment 1:

[0100] As shown in the figure, the structure of a double-knife asphalt concrete test piece cutting machine of the present application comprises a support system 5, a cutting system and a control system; Figure 1 The cutting system is arranged on the support system 5 and is used for cutting asphalt concrete test pieces. The sample feeding system is horizontally movable and is arranged below the cutting system and is used for pushing the asphalt concrete sample to be cut to the cutting system.

[0101] The control system is used for controlling the start or stop of the cutting work of the cutting system and is used for controlling the movement or stop of the position of the sample feeding system.

[0102]

[0103] ​In the embodiment, the cutting system is arranged in a height-adjustable structure, so that the height of the cutting system can be adjusted according to the thickness of the asphalt concrete sample, the cutting system is located at the most suitable cutting position and cutting angle, the starting or stopping of the cutting work of the cutting system and the movement or stopping of the sample feeding system position are controlled by the control system, the movement speed and cutting frequency of the asphalt concrete sample can be accurately controlled, the cutting line of the cut asphalt concrete sample is smooth, the end surface is flat, the size accuracy is high, and the quality of the asphalt concrete sample is effectively improved; and the cutting process has high automation degree, reduces the participation of manual work, and can greatly improve the work efficiency.

[0104] The cutting system comprises a cutting mechanism 3 and a first power mechanism 1, and the first power mechanism 1 is used for driving the cutting mechanism 3.

[0105] As shown in Figure 2 , Figure 3 and Figure 4 , the first power mechanism 1 comprises a cutting motor 1a, a first transmission wheel 1b and a second transmission wheel 1c, the output shaft of the cutting motor 1a is connected with the first transmission wheel 1b, and the first transmission wheel 1b and the second transmission wheel 1c are driven through a transmission belt 1d.

[0106] The cutting mechanism 3 comprises a composite transmission shaft 8, a limiting ring 9, a first cutter head 3b and a second cutter head 3c; one end of the composite transmission shaft 8 is clamped with the second transmission wheel 1c, the other end of the composite transmission shaft 8 is provided with threads, the first cutter head 3b and the second cutter head 3c are arranged on the threads, and the limiting ring 9 is arranged between the first cutter head 3b and the second cutter head 3c.

[0107] The outer part of the composite transmission shaft 8 is provided with a shaft sheath 8a, the shaft sheath 8a is fixedly connected with the support system 5, and the shaft sheath 8a is connected with the composite transmission shaft 8 through a bearing.

[0108] In the embodiment, the end of the composite transmission shaft 8 clamped with the second transmission wheel 1c is provided with a key 8d( Figure 4The second transmission wheel 1c is provided with an inner recessed key groove, and the protruding key 8d is connected with the key groove in an interference fit. In operation, the cutting motor 1a drives the first transmission wheel 1b to rotate, and the first transmission wheel 1b drives the second transmission wheel 1c to rotate through the transmission belt 1d, and the composite transmission shaft 8 rotates with the second transmission wheel 1c, thereby driving the first cutter head 3b and the second cutter head 3c to rotate, so that the first cutter head 3b and the second cutter head 3c start to cut the sample pushed by the sample pushing system. In this embodiment, the limiting ring 9 is replaceable, and different thicknesses of the limiting ring 9 can be selected according to the required width of the asphalt concrete test piece, so as to adjust the distance between the first cutter head 3b and the second cutter head 3c. This design can be used for cutting in a small size and large quantity, and can also be used for cutting in a very small thickness. The design is simple in structure, high in automation, and improves the cutting efficiency of the asphalt concrete test piece.

[0109] The support system 5 is provided with a lubricating device for lubricating the bearing, which comprises an oil cup 14 and an oil pipe 13. The shaft sheath 8a is provided with an oil pipe interface, and the oil cup 14 is connected in sequence through the oil pipe 13, the oil pipe interface and the bearing. The oil cup 14 is fixed on the support system 5.

[0110] In this embodiment, the shaft sheath 8a is arranged outside the composite transmission shaft 8, which can prevent the asphalt concrete residues and the ash layer generated during cutting from falling on the composite transmission shaft 8, and ensure the normal operation of the cutting work. Through the design of the oil cup 14 and the oil pipe 13, the bearing in the shaft sheath 8a is lubricated and cooled, thereby prolonging the service life of the composite transmission shaft 8.

[0111] The support system 5 comprises a machine frame 5b and a machine head support 5a arranged vertically, and the machine frame 5b and the machine head support 5a are connected as a whole.

[0112] The machine head support 5a is provided with a vertical sliding device, which comprises a vertical rail 5c, a fixed block 5d, a connecting plate 5e, a cutter head fixing frame 5f, a height adjusting screw 5g and a rail locking bolt 5h. The fixed block 5d is fixedly arranged on the machine head support 5a and is slidably arranged in the vertical rail 5c, and the vertical rail 5c is fixedly arranged on the cutter head fixing frame 5f. The top end of the vertical rail 5c is provided with the connecting plate 5e, and the height adjusting screw 5g is arranged through the connecting plate 5e and the fixed block 5d. The fixed block 5d is fixedly connected with the vertical rail 5c through the rail locking bolt 5h. The height adjusting screw 5g is used to adjust the height of the cutter head fixing frame 5f, and the rail locking bolt 5h is used to fix the position of the adjusted cutter head fixing frame 5f.

[0113] The cutting motor 1a and the composite transmission shaft 8 are provided on the cutter head fixing bracket 5f, and the composite transmission shaft 8 is located below the cutting motor 1a; the cutter head fixing bracket 5f is fixedly connected to the shaft sheath 8a, and a cutter head cover 3a is provided on the side of the cutter head fixing bracket 5f, and the cutter head cover 3a is arranged above the first cutter head 3b and the second cutter head 3c.

[0114] In this embodiment, when the height of the cutter head needs to be adjusted, first loosen the track locking bolt 5h, and then rotate the height adjustment screw 5g so that the vertical track 5c slides relative to the fixed block 5d as the thread on the height adjustment screw 5g moves up and down. After the height of the cutter head is adjusted, tighten the track locking bolt 5h, and then rotate the height adjustment screw 5g to lock it to ensure that the position of the cutter head will no longer slide. This adjustment process can adapt to asphalt concrete samples of different thicknesses, and this design has a novel structure and good adjustment effect.

[0115] As Figure 1 and Figure 5 shown, a sample feeding system is provided on the frame 5b, and the sample feeding system includes: a horizontal track 4, a connecting mechanism, a sample feeding mechanism and a second power mechanism;

[0116] The horizontal track 4 is arranged on the upper surface of the frame 5b, and the horizontal track 4 is arranged below the cutting mechanism 3; four track wheels 4a are slidably arranged on the horizontal track 4;

[0117] The sample feeding mechanism includes: a loading platform 6; a measuring ruler 6a and a pressing strip 6b are provided on the loading platform 6, the pressing strip 6b is arranged along the direction of the horizontal track 4, and the measuring ruler 6a is perpendicular to the direction of the horizontal track 4;

[0118] The connecting mechanism includes: four connecting brackets 7, and the four connecting brackets 7 are correspondingly arranged at the four corners of the bottom of the loading platform 6; the connecting bracket 7 includes: a vertical plate 7a and a support plate 7b, the support plate 7b is a structure with a "U" - shaped cross - section, the bottom of the "L" - shaped side of the "U" - shaped structure is connected to the bottom of the vertical plate 7a, and the vertical plate 7a is fixedly connected to the side of the loading platform 6; a track wheel 4a is correspondingly arranged below each connecting bracket 7; a track protection cover 4b is arranged on the top of the support plate 7b;

[0119] The second power mechanism includes: a sample feeding motor 15 and a planetary reducer 16; the output shaft of the sample feeding motor 15 is connected to the connecting end of the planetary reducer 16, and the power output shaft of the planetary reducer 16 is connected to a track wheel 4a for driving the loading platform 6 to move along the direction of the horizontal track 4.

[0120] In this embodiment, during operation, the asphalt concrete sample to be cut is placed on the sample stage 6, the edge of the asphalt concrete sample is aligned with the ruler 6a, and the pressing strip 6b is pressed on the upper surface of the asphalt concrete sample to fix the asphalt concrete sample on the sample stage 6. The sample feeding motor 15 is started, and after speed reduction through the planetary reducer 16, the track wheel 4a is driven to rotate, so that the sample stage 6 moves at a constant speed along the direction of the horizontal track 4. When the sample stage 6 moves to the lower side of the cutter head, the cutter head starts to cut the asphalt concrete sample, and the cutting is completed. During this process, the pressing strip 6b and the ruler 6a fix the asphalt concrete sample on the sample stage 6, and the sample feeding motor 15 controls the sample stage 6 to move at a constant speed along the direction of the horizontal track 4, so that the asphalt concrete sample does not deviate during cutting, the cutting size error is reduced, and the quality of the asphalt concrete sample is improved. In addition, the top of the support plate 7b is provided with the track protection cover 4b, which can effectively block the residues and debris generated during cutting outside the track wheel 4a, so that the track wheel 4a carrying the sample stage 6 can normally operate along the direction of the horizontal track 4. The structure is simple, novel and effective.

[0121] As shown in Figure 6 , the sample feeding system is also provided with a plurality of clamps 6c for clamping cylindrical asphalt concrete samples, which include a handle 6ca, a lead screw 6cb, a top head 6cc, and a clamp support 6cd.

[0122] The upper part of the clamp support 6cd is horizontally provided with the lead screw 6cb, one end of the lead screw 6cb is provided with the handle 6ca, and the other end is provided with the arc-shaped top head 6cc, which is used to press against the asphalt concrete sample to prevent it from moving. The clamp support 6cd is provided below with an interface for clamping the sample stage 6.

[0123] In this embodiment, when the asphalt concrete sample to be cut is a cylinder, the concrete sample is placed on the sample stage 6, the clamps 6c are clamped on the opposite sides or multiple positions of the sample stage 6, and then the handle 6ca is held and rotated until the top head 6cc at the other end of the lead screw 6cb abuts against the asphalt concrete sample, so that the asphalt concrete sample can be fixed on the sample stage 6 for subsequent cutting work. This design can firmly clamp the cylindrical asphalt concrete sample to prevent it from moving, which is convenient for subsequent cutting work and has a simple structure and good clamping effect.

[0124] As shown in Figure 7 , the circuit of the control system is divided into a high-voltage circuit part and a low-voltage circuit part.

[0125] The high-voltage circuit part comprises a cutting motor contactor KM1, a thermal protection relay FR1 and a frequency converter 17; the cutting motor contactor KM1 and the thermal protection relay FR1 are used to control the normal operation of the cutting motor 1a; the frequency converter 17 is used to control the running speed and the rotating direction of the sample feeding motor 15; the frequency converter 17 adopts a Delta VFD022M+43B frequency converter;

[0126] The low-voltage circuit part comprises a power switch, a forward button, a backward button, a first intermediate relay KA1, a second intermediate relay KA2, a time relay KT, a start point proximity switch 10 and an end point proximity switch; the frequency converter 17 controls the sample feeding motor 15 to realize the forward rotation through the forward button, the time relay KT and the first intermediate relay KA1, and to realize the reverse rotation through the backward button, the second intermediate relay KA2; the start point proximity switch 10 and the end point proximity switch are used to sense the position of the sample table 6 and realize the disconnection or connection of the circuit; the start point proximity switch 10 is arranged at the start point of the horizontal track 4, and the end point proximity switch 11 is arranged at the end point of the horizontal track 4.

[0127] In the above embodiment, the high-voltage part adopts a three-phase four-wire 380-volt alternating current power supply, and the cutting motor 1a and the sample feeding motor 15 adopt alternating current cage motors. When working, the bituminous concrete sample to be cut is placed on the sample table 6, the power switch is turned on, the forward button is pressed, the cutting motor contactor KM1 is powered and self-locked, the cutting motor 1a starts to rotate and drives the cutter head to rotate. At the same time, the time relay KT is powered and starts to count, when the set time is reached, the time relay KT delay contact is closed, the first intermediate relay KA1 is powered, the frequency converter 17 starts to run forward, and drives the sample table 6 to move forward, when the sample table 6 reaches the position of the end point proximity switch, the proximity switch senses the sample table 6 and changes from being connected to being disconnected, the cutting motor contactor KM1 loses power and is unlocked, the cutting motor 1a stops rotating; at the same time, the time relay KT and the first intermediate relay KA1 lose power, the frequency converter 17 stops running forward, and the sample table 6 stops moving forward.

[0128] When the back button is pressed, the second intermediate relay KA2 is powered and self-locked, the frequency converter 17 controls the sample feeding motor 1 to rotate reversely, driving the carrier platform 6 to move back, when the carrier platform 6 returns to the position of the start point proximity switch 10, the start point proximity switch 10 changes from on to off, the second intermediate relay KA2 is powered off and unlocked, the frequency converter 17 and the sample feeding motor 15 stop running, and the carrier platform 6 stops retreating. The control system realizes the running of the cutting motor 1a, the sample feeding motor and the frequency converter 17 through the high-voltage circuit part, and realizes the control of the forward and reverse running directions of the sample feeding motor 15 through the frequency converter 17 through the low-voltage circuit part. During the running, the frequency converter 17 controls the carrier platform 6 to move at a constant speed along the horizontal track, ensuring the cutting quality of the asphalt concrete test piece, and the cutting process is highly automated, improving the cutting efficiency and reducing the safety risk during use.

[0129] As shown in Figure 1 and Figure 8 , the mobile limit switch 12 is arranged on the side of the rack 5b; the structure of the mobile limit switch 12 comprises a mobile proximity switch 12a, a locking screw 12b, a top plate 12d and a U-shaped fixed clamping groove 12c;

[0130] The fixed clamping groove 12c is clamped on the side of the rack 5b; the inner side of the fixed clamping groove 12c is provided with the top plate 12d, and the locking screw 12b penetrates from one side of the fixed clamping groove 12c and is connected with the top plate 12d; a fixed baffle 12f is vertically arranged on the surface of the other side of the fixed clamping groove 12c, and the mobile proximity switch 12a is arranged on the fixed baffle 12f; a limiting column 12e is arranged beside the sensing head of the mobile proximity switch 12a, and the limiting column 12e is used for protecting the mobile proximity switch 12a from being damaged;

[0131] In the above embodiment, the mobile limit switch 12 is mainly arranged for cutting work without full track, and the position of the mobile proximity switch 12a can be flexibly changed as needed, so that the travel of the carrier platform 6 is ended in advance. When installing, the fixed clamping groove 12c is clamped on the side of the rack 5b, the locking screw 12b is rotated, the top plate 12d is pushed up, so that the mobile limit switch 12 is clamped with the rack 5b; when the position needs to be moved, the locking screw 12b is reversely rotated, the top plate 12d is pulled down, and the position of the mobile limit switch 12 can be easily moved. The mobile limit switch 12 has simple structure and novel design, and has strong applicability.

[0132] As shown in Figure 1As shown, the double-blade asphalt concrete test piece cutting machine is also provided with a cooling system, which comprises a water pump and a water pipe 2, the water inlet end of the water pump is in communication with a water pipe, and the water outlet end of the water pump is in communication with the water pipe 2; the water flow sprayed by the water outlet of the water pipe 2 is used to cool the first cutter head 3b and the second cutter head 3c.

[0133] In the above embodiment, through the design of the water pump and the water pipe 2, on the one hand, the high temperature generated during the high-speed rotation cutting of the first cutter head 3b and the second cutter head 3c can be cooled, and on the other hand, the ash layer and residue generated during cutting can be timely flushed away, thereby ensuring the smooth progress of the cutting work.

[0134] Embodiment 2:

[0135] The difference between embodiment 2 and embodiment 1 is that:

[0136] As shown in Figure 9 , Figure 10 , Figure 11 and Figure 12 , the composite transmission shaft 8 comprises an inner transmission shaft 8e and an outer transmission shaft 8f, both of which are hollow shafts, and the inner transmission shaft 8e is inserted into the outer transmission shaft 8f; both ends of the inner transmission shaft 8e extend out of the outer transmission shaft 8f; both ends of the inner transmission shaft 8e are provided with threads, and one end of the inner transmission shaft 8e is provided with the first cutter head 3b and the second cutter head 3c; the end of the outer transmission shaft 8f away from the first cutter head 3b and the second cutter head 3c is in transmission connection with the second transmission wheel 1c.

[0137] A spline 8eb is arranged on the middle section of the outer surface of the inner transmission shaft 8e, a spline groove 8fa is arranged on the middle section of the inner surface of the outer transmission shaft 8f, the length of the spline 8eb is less than the length of the spline groove 8fa, and the spline 8eb and the spline groove 8fa are in rotational cooperation; both ends of the spline 8eb and the spline groove 8fa are respectively provided with a limiting steel ring 8fb, and both ends of the inner transmission shaft 8e and the outer transmission shaft 8f are fixedly connected through nuts; the inner transmission shaft 8e and the outer transmission shaft 8f can slide relative to each other.

[0138] The limiting ring 9 is an endless telescopic limiting ring, and there are two, which are a first limiting ring and a second limiting ring; the first limiting ring is arranged on the outer side of the end of the inner transmission shaft 8e close to the second transmission wheel 1c, and the second limiting ring is arranged between the first cutter head 3b and the second cutter head 3c.

[0139] Referring to Figure 13The hollow shaft of the inner transmission shaft 8e is a main oil passage, one end of the main oil passage is provided with an adjusting switch 8c, the other end is provided with an oil filling port 8g, and the oil filling port 8g is provided with a one-way valve 8b; the inner transmission shaft 8e is provided with a first lower branch oil passage 8ec on the upper part of one end close to the adjusting switch 8c, and a second lower branch oil passage 8ed on the upper part of one end close to the oil filling port 8g;

[0140] The adjusting switch 8c comprises a hollow bolt 8ca, a long rod bolt 8cb and a sealing plug 8cc; the long rod bolt 8cb passes out from the inside of the hollow bolt 8ca, the inner surface of the hollow bolt 8ca is provided with threads, and the long rod bolt 8cb is threadedly connected with the hollow bolt 8ca; the sealing plug 8cc is arranged in the main oil passage at the lower end of the first lower branch oil passage 8ec, the sealing plug 8cc is provided with a communication hole 8cd for connecting both ends of the main oil passage, and the long rod bolt 8cb is hingedly connected with the sealing plug 8cc.

[0141] As shown in Figure 14 The first limiting ring and the second limiting ring are essentially micro annular hydraulic oil cylinders, which comprise a fixed ring 9a and a moving ring 9b, and the fixed ring 9a and the moving ring 9b are both sleeved on the outside of the inner transmission shaft 8e.

[0142] The fixed ring 9a is provided with an annular chamber 9aa and an upper branch oil passage 9ab; the annular chamber 9aa and the upper branch oil passage 9ab are communicated, and the upper branch oil passage 9ab and the corresponding lower branch oil passage of the inner transmission shaft 8e are communicated through a hollow sealing bolt 9ac; the opening of the upper branch oil passage 9ab is provided with a sealing bolt 9ad to block the upper branch oil passage 9ab;

[0143] The moving ring 9b is provided with an annular piston 9ba, and the annular piston 9ba moves in cooperation with the annular chamber 9aa; the contact part of the annular chamber 9aa and the annular piston 9ba is provided with a sealing rubber ring 9ae;

[0144] The connecting part of the fixed ring 9a and the moving ring 9b is provided with a sealing steel ring 9bb;

[0145] The moving ring 9b of the first limiting ring is connected with the outside of the outer transmission shaft 8f, and the moving ring 9b of the second limiting ring is connected with the first cutter head 3b.

[0146] In this embodiment, when working for the first time, the long rod bolt 8cb is loosened outward, the long rod bolt 8cb pulls the sealing plug 8cc to move outward, so that the upper branch oil way 9ab and the main oil way 8ea are communicated; the sealing bolt 9ad on the upper branch oil way 9ab is removed, oil is filled into the main oil way 8ea through the one-way valve, until the oil fills the entire main oil way 8ea, the lower branch oil way and the upper branch oil way 9ab, then the sealing bolt 9ad on the upper branch oil way 9ab is tightened. Then pressure is applied to the port of the inner transmission shaft 8e close to the second transmission wheel 1c, the first limiting ring is extruded, so that the oil enters the oil cylinder of the second limiting ring from the upper branch oil way of the first limiting ring, the first lower branch oil way 8ec, the main oil way 8ea, the second lower branch oil way 8ed, the upper branch oil way of the second limiting ring in turn, the pressure of the oil cylinder of the second limiting ring increases, the annular piston 9ba moves outward, the distance between the fixed ring 9a and the moving ring 9b of the second limiting ring increases, the second cutter head 3c is pushed away from the first cutter head, and at the same time the inner transmission shaft 8e moves to the side of the cutter head, so that the stepless distance adjustment between the first cutter head 3b and the second cutter head 3c is realized; conversely, tension is applied to the port of the inner transmission shaft 8e close to the second transmission wheel 1c, so that the oil enters the oil cylinder of the first limiting ring from the upper branch oil way of the second limiting ring, the second lower branch oil way 8ed, the main oil way 8ea, the first lower branch oil way 8ec, the upper branch oil way of the first limiting ring in turn, the pressure of the oil cylinder of the first limiting ring increases, the annular piston 9ba moves outward, the distance between the fixed ring 9a and the moving ring 9b of the first limiting ring increases, the inner transmission shaft 8e moves to the side of the second transmission wheel 1c, and the inner transmission shaft 8e drives the second cutter head 3c to move to the first cutter head 3b, so that the distance between the first cutter head 3b and the second cutter head 3c is reduced. During the adjustment of the distance between the two cutter heads, the adjustment switch 8c can open and block the oil way, so as to realize the locking and adjustment mode conversion of the distance between the cutter heads. By designing the main oil way, the lower branch oil way in the inner transmission shaft 8e, the annular chamber 9aa and the annular piston 9ba structure in the limiting ring 9, by applying pressure or tension to the port of the composite transmission shaft 8, the annular chamber 9aa and the annular piston 9ba are caused to move, the distance between the fixed ring 9a and the moving ring 9b in the limiting ring is changed, the oil is pressed in and pressed out between the first limiting ring and the second limiting ring, the stepless telescopic distance adjustment between the first cutter head 3b and the second cutter head 3c is realized, the design is novel, the operation is simple, time and labor are saved, and the work efficiency is greatly improved.

[0147] The above is only a preferred embodiment of the present application, not any limitation on the present application, any simple modification, change and equivalent structure change made according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical solution of the present application.

Claims

1. A dual-knife asphalt concrete test specimen cutter characterized by, The utility model relates to a cutting system for asphalt concrete test piece, which comprises a support system (5), a cutting system and a control system. The support system (5) is provided with a height-adjustable cutting system for cutting asphalt concrete test piece, and is also provided with a horizontally movable sample feeding system below the cutting system for pushing the asphalt concrete sample to be cut to the cutting system. The control system is used for controlling the start or stop of the cutting work of the cutting system and the movement or stop of the position of the sample feeding system. The first power mechanism (1) comprises a cutting motor (1a), a first transmission wheel (1b) and a second transmission wheel (1c), the output shaft of the cutting motor (1a) is connected with the first transmission wheel (1b), and the first transmission wheel (1b) and the second transmission wheel (1c) are driven by a transmission belt (1d). The cutting mechanism (3) comprises a composite transmission shaft (8), a limiting ring (9), a first cutter head (3b) and a second cutter head (3c). The outer part of the composite transmission shaft (8) is provided with a shaft sheath (8a), the shaft sheath (8a) is fixedly connected with the support system (5), and a bearing is arranged between the shaft sheath (8a) and the composite transmission shaft (8). The support system (5) comprises a rack (5b) and a vertically arranged machine head support (5a). The machine head support (5a) is provided with a vertical sliding device, and the sliding device comprises a vertical rail (5c), a fixed block (5d), a connecting plate (5e), a cutter head fixing frame (5f), a height adjusting screw (5g) and a rail locking bolt (5h). The vertical rail (5c) is fixedly arranged on the cutter head fixing frame (5f). The connecting plate (5e) and the fixed block (5d) are provided with the height adjusting screw (5g), and the fixed block (5d) is fixedly connected with the vertical rail (5c) through the rail locking bolt (5h). The height adjusting screw (5g) is used for adjusting the height of the cutter head fixing frame (5f), and the rail locking bolt (5h) is used for fixing the position of the adjusted cutter head fixing frame (5f). The cutter head fixing frame (5f) is provided with the cutting motor (1a) and the composite transmission shaft (8), and the composite transmission shaft (8) is located below the cutting motor (1a); the side surface of the cutter head fixing frame (5f) is provided with a cutter disc cover (3a), and the cutter disc cover (3a) is arranged above the first cutter disc (3b) and the second cutter disc (3c); The composite transmission shaft (8) comprises an inner transmission shaft (8e) and an outer transmission shaft (8f), both of which are hollow shafts, the inner transmission shaft (8e) is penetrated into the outer transmission shaft (8f), both ends of the inner transmission shaft (8e) extend out of the outer transmission shaft (8f), one end of the inner transmission shaft (8e) is provided with the first cutter disc (3b) and the second cutter disc (3c), and the other end of the outer transmission shaft (8f) away from the first cutter disc (3b) and the second cutter disc (3c) is in transmission connection with the second transmission wheel (1c); A spline (8eb) is arranged on the middle section of the outer surface of the inner transmission shaft (8e), a spline groove (8fa) is arranged on the middle section of the inner surface of the outer transmission shaft (8f), the spline (8eb) and the spline groove (8fa) are in rotary connection, and limit steel rings (8fb) are arranged at both ends of the spline (8eb) and the spline groove (8fa); The limit rings (9) are stepless telescopic limit rings, and there are two limit rings, namely a first limit ring and a second limit ring, the first limit ring is arranged on the outer side of one end of the inner transmission shaft (8e) close to the second transmission wheel (1c), and the second limit ring is arranged between the first cutter disc (3b) and the second cutter disc (3c); The hollow shaft of the inner transmission shaft (8e) is a main oil path, one end of the main oil path is provided with an adjusting switch (8c), the other end is provided with an oil filling port (8g), the oil filling port (8g) is provided with a one-way valve (8b), a first lower branch oil path (8ec) is arranged on the upper portion of one end of the inner transmission shaft (8e) close to the adjusting switch (8c), and a second lower branch oil path (8ed) is arranged on the upper portion of one end of the inner transmission shaft (8e) close to the oil filling port (8g); The adjusting switch (8c) comprises a hollow bolt (8ca), a long rod bolt (8cb) and a sealing plug (8cc), the long rod bolt (8cb) penetrates out of the inside of the hollow bolt (8ca), the inner surface of the hollow bolt (8ca) is provided with a thread, the long rod bolt (8cb) is in threaded connection with the hollow bolt (8ca), and the sealing plug (8cc) is arranged in the main oil path at the lower end of the first lower branch oil path (8ec), A communication hole (8cd) for connecting both ends of the main oil path is arranged on the sealing plug (8cc), and the long rod bolt (8cb) is hinged to the sealing plug (8cc). The first limiting ring and the second limiting ring are a kind of micro annular hydraulic cylinder, including: a fixed ring (9a) and a moving ring (9b), both the fixed ring (9a) and the moving ring (9b) are sleeved outside the inner transmission shaft (8e); An annular chamber (9aa) and an upper branch oil passage (9ab) are provided inside the fixed ring (9a); the annular chamber (9aa) and the upper branch oil passage (9ab) are arranged inside the fixed ring; the annular chamber (9aa) and the upper branch oil passage (9ab) are connected, and the upper branch oil passage (9ab) is connected to a corresponding lower branch oil passage on the inner transmission shaft (8e); a sealing bolt (9ad) is provided at the opening of the upper branch oil passage (9ab); An annular piston (9ba) is provided on the moving ring (9b), and the annular piston (9ba) cooperates with the annular chamber (9aa) to perform a piston movement; a sealing rubber ring (9ae) is provided at the contact place between the annular chamber (9aa) and the annular piston (9ba); Sealing steel rings (9bb) are provided at the connection places between the fixed ring (9a) and the moving ring (9b); The moving ring (9b) of the first limiting ring is connected to the outer side of the outer transmission shaft (8f), and the moving ring (9b) of the second limiting ring is connected to the first cutter head (3b); The sample feeding system is arranged on the frame (5b), and the sample feeding system includes: a horizontal track (4), a connecting mechanism, a sample feeding mechanism and a second power mechanism; The horizontal track (4) is arranged on the upper surface of the frame (5b), and the horizontal track (4) is arranged below the cutting mechanism (3); four track wheels (4a) are slidably arranged on the horizontal track (4); The sample feeding mechanism includes: a loading platform (6), and a measuring ruler (6a) and a pressing strip (6b) are provided on the loading platform (6); The connecting mechanism includes: four connecting brackets (7), and the four connecting brackets (7) are correspondingly arranged below the four corners at the bottom of the loading platform (6); the connecting bracket (7) includes: a vertical plate (7a) and a bracket plate (�), the bracket plate (�) is a structure with a "ji” shaped cross section, the bottom of the "L” side of the "ji” shaped structure is connected to the bottom of the vertical plate (7a), and the vertical plate (7a) is fixedly connected to the side surface of the loading platform (6); a track wheel (4a) is correspondingly arranged below each connecting bracket (7); a track protective cover (4b) is arranged at the top of the bracket plate (�); The second power mechanism includes: a sample feeding motor (15) and a planetary reducer (16); the output shaft of the sample feeding motor (15) is connected to the connection end of the planetary reducer (16), and the power output shaft of the planetary reducer (16) is drivingly connected to a track wheel (4a); The sample feeding system further includes: a plurality of clamps (6c); the clamps (6c) are used for clamping cylindrical asphalt concrete samples, and include: a handle (6ca), a lead screw (6cb), a top head (6cc) and a clamp bracket (6cd); The upper horizontal of the clamp support (6cd) is provided with a lead screw (6cb), one end of the lead screw (6cb) is provided with a handle (6ca), and the other end is provided with an arc-shaped top head (6cc) for pressing the asphalt concrete sample to prevent it from moving; the clamp support (6cd) is provided below the interface clamped with the object table (6).

2. The dual-knife asphaltic concrete test specimen cutter according to Claim 1, wherein, The support system (5) is provided with a lubricating device for lubricating the bearing, the lubricating device comprises an oil cup (14) and an oil pipe (13); the shaft sheath (8a) is provided with an oil pipe interface, the oil cup (14) is communicated in sequence through the oil pipe (13), the oil pipe interface and the bearing; the oil cup (14) is arranged on the support system (5).

3. The dual knife asphaltic concrete test specimen cutter of claim 1 wherein, The circuit of the control system is divided into a high-voltage circuit part and a low-voltage circuit part; The high-voltage circuit part comprises a cutting motor contactor (KM1), a thermal protection relay (FR1) and a frequency converter (17); the cutting motor contactor (KM1) and the thermal protection relay (FR1) are used to control the normal operation of the cutting motor (1a); the frequency converter (17) is used to control the running speed and the rotating direction of the sample feeding motor (15); The low-voltage circuit part comprises a power switch, a forward button, a backward button, a first intermediate relay (KA1), a second intermediate relay (KA2), a time relay (KT), a start point proximity switch (10) and an end point proximity switch (11); the frequency converter (17) controls the sample feeding motor (15) to realize forward rotation through the forward button, the time relay (KT) and the first intermediate relay (KA1), and to realize reverse rotation through the backward button, the second intermediate relay (KA2); the start point proximity switch (10) and the end point proximity switch (11) are used to sense the position of the object table (6) and realize the disconnection or connection of the circuit; the start point proximity switch (10) is arranged at the start point end of the horizontal track (4), and the end point proximity switch (11) is arranged at the end point end of the horizontal track (4).

4. The dual knife asphaltic concrete test specimen cutter of claim 3 wherein, A movable limit switch (12) is further arranged between the start point proximity switch (10) and the end point proximity switch (11), and the movable limit switch (12) is arranged on the side edge of the rack (5b); the structure of the movable limit switch (12) comprises a movable proximity switch (12a), a locking screw (12b), a top plate (12d) and a U-shaped fixed clamping groove (12c). The fixed clamping groove (12c) is clamped on the side of the rack (5b); the inner side of the fixed clamping groove (12c) is provided with the top plate (12d), the locking screw (12b) penetrates from one side of the fixed clamping groove (12c) and is connected with the top plate (12d); the surface of the other side of the fixed clamping groove (12c) is vertically provided with the fixed baffle (12f), the fixed baffle (12f) is provided with the movable proximity switch (12a), the sensing head of the movable proximity switch (12a) is provided with the limiting column (12e), and the limiting column (12e) is used for protecting the movable proximity switch (12a) from being damaged.

5. The dual knife asphaltic concrete test specimen cutter according to Claim 1 wherein, The double-blade asphalt concrete test piece cutting machine is further provided with a cooling system, the cooling system comprises a water pump and a water pipe (2), the water inlet of the water pump is communicated with a water pipe, and the water outlet of the water pump is communicated with the water pipe (2); the water flow sprayed by the water pipe (2) is used for cooling the first cutter head (3b) and the second cutter head (3c).

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