CN209894570U

CN209894570U - Highway construction is dry soil for geotechnical experiments and is smashed screening plant

Info

Publication number: CN209894570U
Application number: CN201920359885.2U
Authority: CN
Inventors: 李鸿升; 孙晓林; 吴少强; 焦扬; 韩陆; 杨海永; 赵海平
Original assignee: He'nan Lujia Road & Bridge Co Ltd
Current assignee: He'nan Lujia Road & Bridge Co Ltd
Priority date: 2019-03-21
Filing date: 2019-03-21
Publication date: 2020-01-03
Anticipated expiration: 2029-03-21

Abstract

The utility model discloses a dry soil crushing and screening device for highway construction geotechnical experiments, which comprises a shell, a through groove, an auger roller, a bottom plate and a fixed plate, wherein the periphery of the lower end of the shell is provided with a buffer base which is favorable for buffering the whole device, thereby avoiding the influence on the service life of the device caused by vibration in the use process of the device; the auger roller and the inner shell are arranged, so that soil blocks which do not pass through the sieve mesh can be circularly chopped, and the influence on the screening efficiency due to accumulation at the upper end of the sieve plate is avoided; the arrangement of the first chopping blade, the second chopping blade and the scraping plate is beneficial to multiple chopping of the soil blocks, and meanwhile, the soil blocks are prevented from being attached to the inner wall of the shell, so that the inner wall of the shell can be automatically cleaned; the fixed rotating mechanism is arranged, so that the rotating disc can be stably rotated, and the phenomenon that the efficiency of crushing soil blocks is influenced due to shaking is avoided; set up and pulverize mechanism and through-hole, be favorable to pulverizing the clod after the primary screening, be favorable to sieving more meticulous.

Description

Highway construction is dry soil for geotechnical experiments and is smashed screening plant

Technical Field

The utility model relates to an experimental facilities field specifically is a highway construction is dry soil pulverizes screening plant for geotechnical experiments.

Background

In the construction process of the highway, civil experiments are required, wherein before boundary water content tests, sandy soil relative density tests, compaction tests, bearing ratio (CBR) tests and the like are carried out, air-dried soil bodies meeting certain particle size needs to be prepared in advance for later use. The method for making the spare soil body generally comprises the following steps: spreading disturbed soil body for air drying → manually grinding or hammering the air-dried soil → sieving the ground or hammered air-dried soil by a sieve with a certain mesh number → obtaining the air-dried soil with a certain particle size.

In general, clay soil is easily present in the form of a block because of its high water content before air drying, and is also present in the form of a dry soil block after air drying. The grain size of the dry soil blocks is much larger than that of soil bodies required to be prepared in tests, and the dry soil blocks can meet the test requirements after being manually ground or hammered. The existing manual crushing can not thoroughly crush the soil blocks, and needs to crush or hammer for multiple times, which wastes time and labor; meanwhile, some soil blocks are not crushed thoroughly and cannot pass through the sieve easily, so that the sieve is accumulated easily, and the sieving efficiency is influenced.

Therefore, the technical personnel in the field provide a dry soil crushing and screening device for highway construction geotechnical experiments to solve the problems in the background art.

Disclosure of Invention

An object of the utility model is to provide a highway construction is soil for geotechnical experiment pulverizes screening plant to solve the problem that provides in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a dry soil crushing and screening device for highway construction geotechnical experiments comprises a shell, a through groove, an auger roller, a bottom plate and a fixed plate, wherein a buffer base is arranged on the periphery of the lower end of the shell, the bottom plate is arranged at the lower end of the buffer base, support sleeves are symmetrically arranged on the upper portions of the left side and the right side of the shell, hydraulic cylinders are arranged in the support sleeves, telescopic rods of the hydraulic cylinders are connected with the lower end of the fixed plate, a butt plate is arranged in the middle of the lower end of the fixed plate, support rods are symmetrically arranged on the left side and the right side of the lower end of the butt plate, end covers are arranged at the lower ends of the support rods, a motor mounting seat is arranged in the middle of the upper end of each end cover, a first motor cover is arranged at the upper end of each motor cover, a motor shaft of each first, the lower end of the groove is communicated with the through groove, the fixed rotating mechanism penetrates through the through groove and is in rolling connection with the inner wall of the groove, the left side and the right side of the lower end of the rotary table are respectively and symmetrically provided with an upright post, a second chopping blade and a first chopping blade from outside to inside, the outer side wall of the upright post is vertically and symmetrically provided with a fixed block, the outer end part of the fixed block is provided with a scraping plate, the scraping plate is in sliding connection with the inner wall of the shell, the lower end of a motor shaft of the first motor is provided with a circular plate;

the lower part of the inner wall of the outer shell is provided with a sieve plate, the middle part of the edge around the sieve plate is provided with a plurality of sieve holes, the middle part of the upper end of the sieve plate is provided with an inner shell, the lower part of the side wall of the inner shell is bilaterally symmetrically provided with a feed inlet, the upper part of the side wall of the inner shell is bilaterally symmetrically provided with a discharge outlet, the upper end of the inner shell is provided with a fixed disk, the middle part of the upper end of the fixed disk is provided with a convex block, the convex block is matched with a clamping groove, the convex block is rotatably connected with the clamping groove, the middle part between the lower end inside the outer shell and the lower end of the sieve plate is provided with a fixed frame, the lower end; all be equipped with between the inner wall and pulverize the mechanism about lateral wall and the shell about fixed frame, shell lower extreme edge middle part all around is equipped with a plurality of through-holes, shell lower extreme edge is equipped with the connection bag, bottom plate upper end middle part is equipped with the case, lateral wall middle part is equipped with the lid before the case, case upper end middle part is equipped with the connector, the connector is mutually connected with the other end of connection bag.

As a further aspect of the present invention: the aperture of the sieve pore is larger than that of the through hole.

As a further aspect of the present invention: the buffer base comprises a bottom column, a sliding block, a connecting rod, a buffer shell and a sleeve, wherein the bottom column is arranged around the lower end of the shell, a sliding plate is arranged at the lower end of the bottom column, the buffer shell is sleeved on the outer side wall of the lower part of the bottom column, the inner wall of the buffer shell is in sliding connection with the side wall of the sliding plate, the sleeves are symmetrically arranged at the left and right sides of the lower end in the buffer shell, a telescopic rod is sleeved in each sleeve, the upper end of each telescopic rod is connected with the sliding plate, the lower end of each telescopic rod is provided with a limiting plate, the side wall of each limiting plate is in sliding connection with the inner wall of the corresponding sleeve, a spring is arranged between each limiting plate and the lower end in the sleeve, the middle part of the lower end of the sliding plate is provided with the connecting rod, and the lower supporting block and the upper supporting block at the corresponding positions are connected with each other through a connecting rod.

As a further aspect of the present invention: the fixed rotating mechanism comprises a fixed rod, balls and a connecting block, the fixed rod is symmetrically arranged on the left side and the right side of the upper end of the rotary table, the upper end of the fixed rod penetrates through the through groove and is provided with the connecting block, the balls are arranged on the peripheral side wall of the connecting block, and the balls are connected with the inner wall of the groove in a rolling mode.

As a further aspect of the present invention: the grinding mechanism comprises a driving grinding roller, cover bodies, third motor covers, driven grinding rollers and a conveyor belt, the cover bodies are symmetrically arranged on the left side and the right side of the lower portion of the side wall of the shell, the third motor covers are arranged on the outer side walls of the cover bodies, and third motors are arranged in the third motor covers; the utility model discloses a crushing roller, including the cover body, the cover body is equipped with the cover body, the drive crushing roller symmetry sets up the front side between shell inner wall and the fixed frame lateral wall, driven crushing roller symmetry sets up the rear side between shell inner wall and the fixed frame lateral wall, the outer tip of drive crushing roller and driven crushing roller all passes the shell and connects cover body inner wall through the bearing, is located the cover body inside drive crushing roller lateral wall cover is equipped with the initiative rim plate, be located cover body inside driven crushing roller lateral wall cover is equipped with the driven rim plate, pass through conveyer belt interconnect between initiative rim plate and the driven rim plate, the motor shaft of third motor passes the cover body and passes through the one end.

As a further aspect of the present invention: the models of the first motor, the second motor and the third motor are YD160L-4/2, and the model of the hydraulic cylinder is XBYG.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model has reasonable structural design, and is provided with the buffer base, thereby being beneficial to buffering the whole device and avoiding the vibration in the use process of the device from influencing the service life of the device; the auger roller and the inner shell are arranged, so that soil blocks which do not pass through the sieve mesh can be circularly chopped, and the influence on the screening efficiency due to accumulation at the upper end of the sieve plate is avoided; the arrangement of the first chopping blade, the second chopping blade and the scraping plate is beneficial to multiple chopping of the soil blocks, and meanwhile, the soil blocks are prevented from being attached to the inner wall of the shell, so that the inner wall of the shell can be automatically cleaned; the fixed rotating mechanism is arranged, so that the rotating disc can be stably rotated, and the phenomenon that the efficiency of crushing soil blocks is influenced due to shaking is avoided; set up and pulverize mechanism and through-hole, be favorable to pulverizing the clod after the primary screening, be favorable to sieving more meticulous.

Drawings

Fig. 1 is a schematic structural diagram of a dry soil crushing and screening device for highway construction geotechnical experiments.

Fig. 2 is a schematic structural diagram of a dry soil crushing and screening device A for highway construction geotechnical experiments.

Fig. 3 is a schematic structural diagram of a buffer base in the dry soil crushing and screening device for highway construction geotechnical experiments.

Fig. 4 is a schematic structural diagram of a dry soil crushing and screening device B for highway construction geotechnical experiments.

Fig. 5 is a schematic top view of a crushing mechanism in the dry soil crushing and screening device for highway construction geotechnical experiments.

In the figure: the device comprises an outer shell 1, a sieve plate 2, a feed inlet 3, an inner shell 4, a support sleeve 5, an auger roller 6, a discharge port 7, a first chopping blade 8, a fixed disc 9, a hydraulic cylinder 10, a circular plate 11, a fixed plate 12, a butt plate 13, a motor mounting seat 14, a first motor cover 15, a first motor 16, a support rod 17, an end cover 18, a rotary disc 19, a bump 20, a scraper 21, a second chopping blade 22, a stand column 23, a fixed block 24, a sieve pore 25, a fixed frame 26, a through hole 27, a fixed seat 28, a buffer base 29, a bottom column 2901, a buffer shell 2902, a sliding plate 2903, a limit plate 2904, a sleeve 2905, a spring 2906, a connecting rod 2907, a lower support block 2908, a sliding block 2909, a sliding chute 2910, an upper support block 2911, an upper support 2912, a connecting rod 2913, a bottom plate 30, a storage box 31, a cover body 32, a connecting bag 33, a connecting bag, The grinding device comprises balls 3802, a connecting block 3803, a grinding mechanism 39, a driving grinding roller 3901, a cover body 3902, a third motor cover 3903, a third motor 3904, a driving wheel disc 3905, a conveying belt 3906, a driven wheel disc 3907 and a driven grinding roller 3908.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 5, in an embodiment of the present invention, a dry soil crushing and screening device for highway construction geotechnical experiments includes a housing 1, a through groove 37, an auger roller 6, a bottom plate 30 and a fixing plate 12, wherein a buffer base 29 is disposed around the lower end of the housing 1, the bottom plate 30 is disposed at the lower end of the buffer base 29, support sleeves 5 are symmetrically disposed at the upper portions of the left and right sides of the housing 1, hydraulic cylinders 10 are disposed inside the support sleeves 5, telescopic rods of the hydraulic cylinders 10 are connected to the lower end of the fixing plate 12, a supporting plate 13 is disposed in the middle of the lower end of the fixing plate 12, support rods 17 are symmetrically disposed at the left and right sides of the lower end of the supporting plate 13, an end cover 18 is disposed at the lower end of the support rods 17, a motor mounting seat 14 is disposed at the middle of the upper end of the end cover 18, a motor shaft of the first motor 16 penetrates through an end cover 18 and is sleeved with a rotary disc 19, the left side and the right side of the upper end of the rotary disc 19 are symmetrically provided with fixed rotating mechanisms 38, the inner side of the end cover 18 is provided with a groove 36, the lower end of the groove 36 is communicated with a through groove 37, the fixed rotating mechanisms 38 penetrate through the through groove 37 and are in rolling connection with the inner wall of the groove 36, the left side and the right side of the lower end of the rotary disc 19 are respectively and symmetrically provided with an upright post 23, a second chopping blade 22 and a first chopping blade 8 from outside to inside, the outer side wall of the upright post 23 is vertically and symmetrically provided with fixed blocks 24, the outer end part of each fixed block 24 is provided with a scraping plate 21, the scraping plates 21 are in sliding connection with the inner wall;

the lower part of the inner wall of the shell 1 is provided with a sieve plate 2, the middle part of the peripheral edge of the sieve plate 2 is provided with a plurality of sieve holes 25, an inner shell 4 is arranged in the middle of the upper end of the sieve plate 2, feed inlets 3 are symmetrically arranged on the left and right of the lower part of the side wall of the inner shell 4, the upper part of the side wall of the inner shell 4 is symmetrically provided with discharge ports 7, the upper end of the inner shell 4 is provided with a fixed disc 9, the middle part of the upper end of the fixed disc 9 is provided with a convex block 20, the convex block 20 is matched with the clamping groove, the lug 20 is rotatably connected with the clamping groove, a fixed frame 26 is arranged in the middle between the lower end of the inside of the shell 1 and the lower end of the sieve plate 2, a fixed seat 28 is arranged at the lower end of the inner side of the shell 1 in the fixed frame 26, the upper end of the fixed seat 28 is provided with a second motor 35, a motor shaft of the second motor 35 penetrates through the sieve plate 2 and is connected with one end of the auger roller 6 through a coupler, and the other end of the auger roller 6 is connected with the middle part of the lower end of the fixed disk 9 through a bearing; all be equipped with between lateral wall and the shell 1 about fixed frame 26 and pulverize the mechanism 39, the edge middle part all around of shell 1 lower extreme is equipped with a plurality of through-

holes

27, 1 lower extreme edge of shell is equipped with connection bag 34, bottom plate 30 upper end middle part is equipped with case 31, lateral wall middle part is equipped with lid 32 before case 31, case 31 upper end middle part is equipped with connector 33, connector 33 and the other end interconnect of connection bag 34.

The holes of the sieve 25 are larger than the holes of the through holes 27.

The buffer base 29 comprises a bottom column 2901, a sliding block 2909, a connecting rod 2907, a buffer shell 2902 and a sleeve 2905, wherein the bottom column 2901 is arranged around the lower end of the outer shell 1, a sliding plate 2903 is arranged at the lower end of the bottom column 2901, the buffer shell 2902 is sleeved on the outer side wall of the lower part of the bottom column 2901, the inner wall of the buffer shell 2902 is in sliding connection with the side wall of the sliding plate 2903, the sleeve 2905 is symmetrically arranged at the left side and the right side of the lower end in the buffer shell 2902, an expansion rod 2912 is sleeved in the sleeve 2905, the upper end of the expansion rod 2912 is connected with the sliding plate 2903, the lower ends of the expansion rods 2912 are respectively provided with a limiting plate 2904, the side wall of the limiting plate 2904 is in sliding connection with the inner wall of the sleeve 2905, a spring 2906 is arranged between the limiting plate 2904 and the lower end in the sleeve 2905, a connecting rod 2913 is arranged in, the sliding groove 2910 is slidably connected to the slider 2909, the upper end of the slider 2909 is provided with a lower support block 2908, and the lower support block 2908 and the upper support block 2911 are connected to each other through a connecting rod 2907 at corresponding positions.

The fixed rotating mechanism 38 comprises a fixed rod 3801, balls 3802 and connecting blocks 3803, the fixed rod 3801 is symmetrically arranged on the left side and the right side of the upper end of the turntable 19, the upper end of the fixed rod 3801 penetrates through the through groove 37 and is provided with the connecting blocks 3803, the balls 3802 are arranged on the peripheral side walls of the connecting blocks 3803, and the balls 3802 are in rolling connection with the inner walls of the grooves 36.

The grinding mechanism 39 comprises a driving grinding roller 3901, a cover body 3902, a third motor cover 3903, a driven grinding roller 3908 and a conveyor belt 3906, wherein the cover body 3902 is symmetrically arranged on the left side and the right side of the lower portion of the side wall of the shell 1, the third motor cover 3903 is arranged on the outer side wall of the cover body 3902, and a third motor 3904 is arranged inside the third motor cover 3903; the symmetrical front side that sets up between 1 inner wall of shell and fixed frame 26 lateral wall of initiative crushing roller 3901, driven crushing roller 3908 symmetry sets up the rear side between 1 inner wall of shell and fixed frame 26 lateral wall, the outer tip of initiative crushing roller 3901 and driven crushing roller 3908 all passes shell 1 and connects the cover body 3902 inner wall through the bearing, is located the inside initiative crushing roller 3901 lateral wall cover of the cover body 3902 is equipped with driving wheel disc 3905, is located the inside driven crushing roller 3908 lateral wall cover of the cover body 3902 is equipped with from driving wheel disc 3907, through conveyer belt 3906 interconnect between driving wheel disc 3905 and the driven wheel disc 3907, the motor shaft of third motor 3904 passes the cover body 3902 and connects the one end of initiative crushing roller 3901 through the shaft coupling.

The models of the first motor 16, the second motor 35 and the third motor 3904 are YD160L-4/2, and the model of the hydraulic cylinder 10 is XBYG.

The utility model discloses a theory of operation is:

the utility model relates to a highway construction geotechnical experiment is with dry soil crushing screening plant, start hydraulic cylinder 10 through external controller, hydraulic cylinder 10 rises and drives fixed plate 12 to rise, thereby drive and take place the separation between end cover 18 and the shell 1, pour the soil block after the air-drying into the shell 1 inside, later controller control pneumatic cylinder 10 withdraws, close end cover 18, start first motor 16, the motor shaft lateral wall cover of first motor 16 is equipped with carousel 19, the bilateral symmetry in carousel 19 upper end is equipped with fixed slewing mechanism 38, roll connection between ball 3802 of fixed slewing mechanism 38 and the recess 36 of end cover 18 inboard, guarantee that carousel 19 steadily rotates, the bilateral symmetry is equipped with stand 23 respectively in carousel 19 lower extreme left and right sides, first shredding blade 8 and second shredding blade 22, the soil block of shell 1 inside is shredded and is smashed, avoid the shell 1 inner wall to be stained with the soil block simultaneously, the chopped soil blocks slide down along the sieve plate 2 to pass through the sieve holes 25, the soil blocks which do not pass through the sieve holes 25 enter the feeding hole 3 of the inner shell 4, the second motor 35 is started, the auger roller 6 is driven by the second motor 35 to rotate, and the uncut soil blocks are lifted to be discharged through the discharging hole 7 until the soil blocks pass through the sieve holes 25; the soil blocks passing through the sieve holes 25 are rolled by the grinding mechanism 39, pass through the through holes 27, enter the storage box 31 along the connecting bag 34 for storage, complete grinding and multiple screening processes, and are beneficial to more careful screening; all be equipped with buffer base 29 around the shell 1 lower extreme, through buffer base 29, be favorable to wholly buffering the device, avoid the device to take place to vibrate in the use, influence the life of device.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a highway construction geotechnical experiment pulverizes screening plant with dry soil, includes shell (1), leads to groove (37), auger roller (6), bottom plate (30) and fixed plate (12), its characterized in that: the lower end of the shell (1) is provided with buffer bases (29) all around, the lower end of each buffer base (29) is provided with a bottom plate (30), the upper portions of the left side and the right side of the shell (1) are symmetrically provided with support sleeves (5), hydraulic cylinders (10) are arranged inside the support sleeves (5), telescopic rods of the hydraulic cylinders (10) are connected with the lower end of a fixing plate (12), the middle portion of the lower end of the fixing plate (12) is provided with a butt plate (13), support rods (17) are symmetrically arranged on the left side and the right side of the lower end of the butt plate (13), the lower end of each support rod (17) is provided with an end cover (18), the middle portion of the upper end of each end cover (18) is provided with a motor mounting seat (14), the upper end of each motor mounting seat (14) is provided with a first motor cover (15), a first motor (16) is arranged inside the, the left side and the right side of the upper end of the rotary table (19) are symmetrically provided with fixed rotating mechanisms (38), the inner side of the end cover (18) is provided with a groove (36), the lower end of the groove (36) is communicated with a through groove (37), the fixed rotating mechanisms (38) penetrate through the through groove (37) and are in rolling connection with the inner wall of the groove (36), the left side and the right side of the lower end of the rotary table (19) are respectively and symmetrically provided with an upright post (23), a second chopping blade (22) and a first chopping blade (8) from outside to inside, the outer side wall of the upright post (23) is vertically and symmetrically provided with fixed blocks (24), the outer end part of each fixed block (24) is provided with a scraping plate (21), the scraping plates (21) are in sliding connection with the inner wall of the shell (1), the lower end of a motor;

the sieve plate structure is characterized in that a sieve plate (2) is arranged on the lower portion of the inner wall of the shell (1), a plurality of sieve holes (25) are formed in the middle of the edge of the periphery of the sieve plate (2), an inner shell (4) is arranged in the middle of the upper end of the sieve plate (2), feed inlets (3) are formed in the bilateral symmetry of the lower portion of the side wall of the inner shell (4), discharge outlets (7) are formed in the bilateral symmetry of the upper portion of the side wall of the inner shell (4), a fixed disk (9) is arranged on the upper end of the inner shell (4), a convex block (20) is arranged in the middle of the upper end of the fixed disk (9), the convex block (20) is matched with a clamping groove, the convex block (20) is rotatably connected with the clamping groove, a fixed frame (26) is arranged in the middle of the lower end of the inner, a motor shaft of the second motor (35) penetrates through the sieve plate (2) and is connected with one end of the auger roller (6) through a coupler, and the other end of the auger roller (6) is connected with the middle part of the lower end of the fixed plate (9) through a bearing; all be equipped with grinding mechanism (39) between lateral wall and shell (1) about fixed frame (26) about between the inner wall, shell (1) lower extreme edge middle part all around is equipped with a plurality of through-holes (27), shell (1) lower extreme edge is equipped with connection bag (34), bottom plate (30) upper end middle part is equipped with case (31), lateral wall middle part is equipped with lid (32) before case (31), case (31) upper end middle part is equipped with connector (33), connector (33) and the other end interconnect of connecting bag (34).

2. The dry soil crushing and screening device for the highway construction geotechnical experiments as claimed in claim 1, wherein: the aperture of the sieve pore (25) is larger than that of the through hole (27).

3. The dry soil crushing and screening device for the highway construction geotechnical experiments as claimed in claim 1, wherein: the buffer base (29) comprises a bottom column (2901), a sliding block (2909), a connecting rod (2907), a buffer shell (2902) and a sleeve (2905), the bottom column (2901) is arranged on the periphery of the lower end of the outer shell (1), a sliding plate (2903) is arranged at the lower end of the bottom column (2901), a buffer shell (2902) is sleeved on the outer side wall of the lower portion of the bottom column (2901), the inner wall of the buffer shell (2902) is in sliding connection with the side wall of the sliding plate (2903), the sleeves (2905) are symmetrically arranged on the left side and the right side of the lower end in the buffer shell (2902), a telescopic rod (2912) is sleeved in the sleeve (2905), the upper end of the telescopic rod (2912) is connected with the sliding plate (2903), limiting plates (2904) are arranged at the lower ends of the telescopic rod (2912), the side walls of the limiting plates (2904) are in sliding connection with the inner wall of the sleeve (2905), and, the middle part of the lower end of the sliding plate (2903) is provided with a connecting rod (2913), the lower end of the connecting rod (2913) is provided with an upper supporting block (2911), the left side and the right side of the lower end in the buffer shell (2902) are symmetrically provided with sliding grooves (2910), the sliding grooves (2910) are in sliding connection with the sliding block (2909), the upper end of the sliding block (2909) is provided with a lower supporting block (2908), and the lower supporting block (2908) and the upper supporting block (2911) at corresponding positions are connected with each other through a connecting rod (2907).

4. The dry soil crushing and screening device for the highway construction geotechnical experiments as claimed in claim 1, wherein: the fixed rotating mechanism (38) comprises a fixed rod (3801), balls (3802) and connecting blocks (3803), the fixed rod (3801) is symmetrically arranged on the left side and the right side of the upper end of the rotary disc (19), the upper end of the fixed rod (3801) penetrates through the through groove (37) and is provided with the connecting blocks (3803), the balls (3802) are arranged on the peripheral side walls of the connecting blocks (3803), and the balls (3802) are in rolling connection with the inner walls of the grooves (36).

5. The dry soil crushing and screening device for the highway construction geotechnical experiments as claimed in claim 1, wherein: the grinding mechanism (39) comprises a driving grinding roller (3901), a cover body (3902), a third motor cover (3903), driven grinding rollers (3908) and a conveyor belt (3906), wherein the cover body (3902) is symmetrically arranged on the left side and the right side of the lower portion of the side wall of the shell (1), the third motor cover (3903) is arranged on the outer side wall of the cover body (3902), and a third motor (3904) is arranged in the third motor cover (3903); initiative crushing roller (3901) symmetry sets up the front side between shell (1) inner wall and fixed frame (26) lateral wall, driven crushing roller (3908) symmetry sets up the rear side between shell (1) inner wall and fixed frame (26) lateral wall, initiative crushing roller (3901) and driven crushing roller (3908) outer tip all pass shell (1) and connect cover body (3902) inner wall through the bearing, are located the inside initiative crushing roller (3901) lateral wall cover of the cover body (3902) is equipped with initiative rim plate (3905), is located driven crushing roller (3908) lateral wall cover inside the cover body (3902) is equipped with from driving rim plate (3907), pass through conveyer belt (3906) interconnect between initiative rim plate (3905) and the driven rim plate (3907), the motor shaft of third motor (3904) passes the cover body (3902) and connects the one end of initiative crushing roller (3901) through the shaft coupling.

6. The dry soil crushing and screening device for the highway construction geotechnical experiments as claimed in claim 1, wherein: the models of the first motor (16), the second motor (35) and the third motor (3904) are YD160L-4/2, and the model of the hydraulic cylinder (10) is XBYG.