Sampling system

Abstract

The invention discloses a sampling system, and relates to the technical field of grain detection, the sampling system comprises a mounting platform, a sampling machine and a plurality of pressing assemblies, the mounting platform comprises a platform part and a plurality of supporting parts, the platform part is provided with a negative pressure cabin, and each supporting part is provided with a plurality of connecting rods; the sampler is used for sampling unprocessed grains, a plurality of stand columns are arranged on the sampler, the number of the stand columns is consistent with that of the supporting parts, the stand columns and the supporting parts are arranged in a one-to-one correspondence mode, the bottoms of the stand columns abut against the supporting parts, and the negative pressure cabin is used for providing negative pressure for the sampler; each pressing assembly comprises a pressing rod and a pressing piece, and the two ends of each pressing rod are provided with inserting holes allowing the connecting rods to penetrate through. Through cooperation of the connecting rod on the mounting platform, the stand column of the sampler and the pressing assembly, the sampler can be quickly disassembled and assembled, the mounting process is shortened, the sampler can be quickly mounted and put into use in emergency, and due to the fact that the processes of concrete pouring, frame mounting and the like are not needed, the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of grain detection, and in particular to a sampling system. Background Art

[0002] The sampling machine is a kind of equipment in the grain industry. It is widely used because it can reduce manpower input, improve work efficiency, and avoid cheating. However, due to the characteristics of grain procurement in two seasons a year, grain depots and other places only use the sampling machine in the grain procurement season after installing it, and it is idle after the procurement business is completed, and it cannot play its maximum value; at the same time, the installation process of the sampling machine is complicated, and usually requires complex processes such as pouring concrete and installing frames to achieve installation, resulting in a long installation process, which cannot be used in time when facing emergencies, and consumes a lot of funds, especially in some small local grain depots, which have no financial support or cannot provide a large area to install the sampling machine, and still use manual sampling. Summary of the invention

[0003] The main purpose of the present invention is to provide a sampling system, aiming to solve the problems in the prior art that the sampling machine has a long installation process, cannot be used in time, and consumes a lot of funds.

[0004] To achieve the above object, the present invention provides a sampling system, comprising:

[0005] An installation platform, the installation platform comprising a platform portion and a plurality of support portions, the platform portion being provided with a negative pressure cabin, and each of the support portions being provided with a plurality of connecting rods;

[0006] A sampling machine, the sampling machine is used to poke raw grains, the sampling machine is provided with a plurality of columns, the number of the columns is consistent with the number of the support parts and is arranged one by one, the bottom of the column is used to abut against the support part, when the column abuts against the support part, a plurality of connecting rods are arranged around the outer circumference of the column, and the negative pressure cabin is used to provide negative pressure for the sampling machine;

[0007] Multiple clamping assemblies, each of which includes a clamping rod and a clamping piece. Both ends of each clamping rod are provided with a socket for the connecting rod to pass through. When the clamping rod is plugged into the socket, it abuts against the column. The clamping piece is used to clamp the clamping rod against the column.

[0008] In one embodiment, the column includes a vertical pole and a base, the bottom of the base abuts against the support portion, the top of the base is connected to the vertical pole, the bottom of the base forms a step, the top surface of the step forms an abutment surface, and the pressure rod abuts against the abutment surface when it is plugged into the socket.

[0009] In one embodiment, the support portion and the base are both in the shape of a rectangular parallelepiped, and four connecting rods are disposed on each of the support portions, and the four connecting rods are respectively disposed at four corners of the base.

[0010] In one embodiment, the connecting rod is a screw rod, the pressing piece is a nut, and the pressing piece is threadedly matched with the connecting rod to press the pressing rod against the abutment surface.

[0011] In one embodiment, the sampling machine also includes a guide rail, a traveling frame, a driving module and a sampling device, a plurality of the columns are spaced apart and connected to the bottom of the guide rail, the sampling device is slidably connected to the guide rail through the traveling frame, the driving device is used to drive the traveling frame to slide along the guide rail, the sampling device is used to sample raw grains, and the negative pressure cabin provides negative pressure to the sampling device through a sampling pipeline.

[0012] In one embodiment, the sampling device includes a rotating seat, a cantilever, a first connecting rod, a second connecting rod and a sampling rod. The rotating seat is rotatably mounted on the walking frame, the cantilever is mounted on the rotating seat and extends in a direction away from the rotating seat, the first connecting rod is rotatably connected to the rotating seat and is arranged parallel to the cantilever, the end of the first connecting rod away from the rotating seat is connected to the second connecting rod, the second connecting rod is rotatably connected to the end of the cantilever away from the rotating seat, the end of the second connecting rod away from the first connecting rod is connected to the sampling rod, and the sampling rod is hollow and connected to the sampling pipeline.

[0013] In one embodiment, a buffer is also provided on the rotating seat, and the buffer includes a sleeve, a telescopic shaft and an elastic member. The telescopic shaft is arranged in the sleeve, and the elastic member is sleeved on the outside of the telescopic shaft and is located between the telescopic shaft and the sleeve. The elastic member connects the sleeve and the telescopic shaft, and the telescopic shaft is connected to the first connecting rod.

[0014] In one embodiment, the negative pressure cabin includes an outer shell, a negative pressure machine, a sample bin and a temporary storage cabinet. An installation cavity is formed in the outer shell. The negative pressure machine, the sample bin and the temporary storage cabinet are all arranged in the installation cavity. The temporary storage cabinet is connected with the sampling pipeline. The temporary storage cabinet is used to screen grains and is provided with a storage cavity for temporarily storing grains. The negative pressure machine is connected with the storage cavity and is used to generate negative pressure. The storage cavity is provided with an output pipeline connecting the storage cavity and the sample bin. The sample bin is used to store grains and transport the grains to external inspection equipment through the sample grain pipeline.

[0015] In one embodiment, the sampling system also includes a residual grain return device, which includes a bracket, a cross arm, a rotating drive member and a funnel. The cross arm is installed on the guide rail through the bracket, and the funnel is located at an end of the cross arm away from the bracket. The rotating drive member is used to drive the cross arm to rotate to drive the funnel to rotate. The funnel is connected to the storage chamber through a residual grain pipeline and is used to transport the residual grain after screening.

[0016] In one embodiment, the guide rail comprises:

[0017] A base plate, the bottom of which is provided with the upright column;

[0018] Two walking parts are protruded from the bottom plate and spaced apart on both sides of the bottom plate in the width direction. A pulley is provided at the bottom of the walking frame, and the walking frame is in sliding contact with the two walking parts through the pulley.

[0019] The technical solution of the present invention is to set a column at the bottom of the sampler, set a support part on the installation platform, and after the column and the support part are abutted, pass the pressure rod through the connecting rod on the support part, and press the pressure rod against the column through a clamping member, so that the pressure rod is set at the periphery of the column, and while limiting the horizontal movement of the column, the clamped pressure rod gives the column a force in the vertical direction to prevent the column from moving in the vertical direction, thereby realizing rapid installation of the sampler and the installation platform, without the need for complicated processes such as concrete pouring and installation of the frame. The present invention realizes the rapid disassembly and assembly of the sampler through the cooperation of the connecting rod on the installation platform with the column of the sampler and the clamping assembly, shortens the installation process, can be quickly installed and put into use in an emergency, and because there is no need to perform processes such as concrete pouring and installation of the frame, the cost and the money spent are reduced, and the easy disassembly and assembly and recyclable use further reduce the rental cost, so that local small grain depots can also use the sampler for sampling, and improve the sampling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 A schematic structural diagram of the sampling system provided by the present invention at one viewing angle;

[0022] Figure 2 A schematic structural diagram of the sampling system provided by the present invention from another perspective;

[0023] Figure 3 A schematic diagram of the structure of the columns and guide rails of the sampling system provided by the present invention;

[0024] Figure 4 A schematic diagram of the structure of the column and the support part of the sampling system provided by the present invention;

[0025] Figure 5 A schematic diagram of the structure of a sampling device of the sampling system provided by the present invention;

[0026] Figure 6 A schematic diagram of the structure of a negative pressure cabin of the sampling system provided by the present invention;

[0027] Figure 7 A schematic cross-sectional structural diagram of a buffer of the sampling system provided by the present invention;

[0028] Figure 8 This is a schematic structural diagram of the surplus grain returning device of the sampling system provided by the present invention.

[0029] Description of Figure Numbers:

[0030] 100. Sampling system; 1. Installation platform; 11. Platform; 12. Support; 13. Connecting rod; 14. Support leg; 2. Negative pressure chamber; 21. Shell; 22. Negative pressure machine; 23. Sample chamber; 24. Temporary storage cabinet; 3. Sampling machine; 31. Column; 311. Pole; 312. Base; 313. Abutment surface; 314. Step; 32. Guide rail; 321. Bottom plate; 322. Walking part; 33. Walking frame; 331. Pulley ; 34. Drive module; 35. Sampling device; 351. Rotating seat; 352. Cantilever; 353. First connecting rod; 354. Second connecting rod; 355. Sampling rod; 36. Buffer; 361. Sleeve; 362. Telescopic shaft; 363. Elastic member; 4. Clamping assembly; 41. Pressing rod; 42. Clamping member; 50. Residual grain returning device; 51. Bracket; 52. Cross arm; 53. Rotating driving member; 54. Funnel; 60. Sampling pipeline.

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] Due to the fact that grain is purchased twice a year, grain depots and other places only use sampling machines during the grain purchasing season after installation. After the purchasing business is completed, they are idle and cannot play their maximum value. At the same time, the installation process of the sampling machine is complicated, and usually requires complex processes such as pouring concrete and installing frames to achieve installation, resulting in a long installation process, which cannot be used in time when facing emergencies and consumes a lot of funds. In particular, some small grain depots in some places have no financial support or cannot provide a large area to install sampling machines, and still use manual sampling.

[0036] To solve the above problems, the present invention provides a sampling system 100 .

[0037] Please combine Figures 1 to 4 The sampling system 100 of this embodiment includes an installation platform 1, a sampling machine 3 and a plurality of pressing components 4. The installation platform 1 includes a platform portion 11 and a plurality of supporting portions 12. A negative pressure cabin 2 is provided on the platform portion 11, and a plurality of connecting rods 13 are provided on each supporting portion 12. The sampling machine 3 is used to pick raw grains. A plurality of columns 31 are provided on the sampling machine 3. The number of the columns 31 is consistent with the number of the supporting portions 12 and is arranged one by one. The bottom is used to abut against the support part 12. When the column 31 abuts against the support part 12, multiple connecting rods 13 are arranged around the outer periphery of the column 31, and the negative pressure chamber 2 is used to provide negative pressure for the sampling machine 3; each clamping assembly 4 includes a pressure rod 41 and a clamping piece 42. Both ends of each pressure rod 41 are provided with a socket for the connecting rod 13 to pass through. When the pressure rod 41 is plugged into the socket, it abuts against the column 31. The clamping piece 42 is used to clamp the pressure rod 41 against the column 31.

[0038] It can be understood that the mounting platform 1 has a large load mass, and can bear the negative pressure cabin 2 while meeting the strength requirements for the operation of the sampling machine 3. The present application integrates all negative pressure-related components into the negative pressure cabin 2, which is convenient for lifting and installation, further improving the assembly efficiency and speed.

[0039] The technical solution of the present invention is to set a column 31 at the bottom of the sampling machine 3, set a support part 12 on the installation platform 1, and after the column 31 and the support part 12 are abutted, the pressure rod 41 is passed through the connecting rod 13 on the support part 12, and the pressure rod 41 and the column 31 are pressed tightly by the clamping piece 42, so that the pressure rod 41 is set at the outer periphery of the column 31, and while limiting the horizontal movement of the column 31, the pressed pressure rod 41 applies a vertical force to the column 31 to prevent the column 31 from moving in the vertical direction, thereby realizing the rapid installation of the sampling machine 3 and the installation platform 1, without the need for complicated processes such as concrete pouring and frame installation. The present invention realizes the rapid disassembly and assembly of the sampling machine 3 through the cooperation of the connecting rod 13 on the installation platform 1 with the column 31 of the sampling machine 3 and the clamping assembly 4, shortens the installation process, can be quickly installed and put into use in an emergency, and because there is no need to perform processes such as concrete pouring and frame installation, the cost and capital expenditure are reduced, and the easy disassembly and assembly and recycling further reduce the rental cost, so that local small grain depots can also use the sampling machine 3 for sampling, thereby improving the sampling efficiency.

[0040] In one embodiment, the column 31 includes a vertical rod 311 and a base 312, the bottom of the base 312 abuts against the support portion 12, the top of the base 312 is connected to the vertical rod 311, and a step is formed at the bottom of the base 312 so that the top surface of the step forms an abutment surface 313, and the pressure rod 41 abuts against the abutment surface 313 when plugged into the jack. By forming a step at the bottom of the base 312 and forming the abutment surface 313 on the top surface of the step, the contact area between the pressure rod 41 and the base 312 is increased, thereby increasing the fixing effect of the pressure rod 41 on the base 312, and making the entire sampling machine 3 more stable.

[0041] Specifically, the support part 12 and the base 312 are both arranged in a rectangular parallelepiped, and four connecting rods 13 are arranged on each support part 12, and the four connecting rods 13 are respectively arranged at the four corners of the base 312. By arranging the connecting rods 13 at the four corners corresponding to the base 312 on the support part 12, the connecting rods 13 at the four corners serve as force transmission and distribution points, which can more evenly bear the pressure of the sampling machine 3 and reduce the shaking or tilting of the sampling machine 3. It can effectively increase the stability of the entire sampling system 100; it can also avoid the force from being concentrated on a certain point, reduce local stress, and extend the service life of the sampling system 100.

[0042] Furthermore, the bottom of the support portion 12 is provided with supporting feet 14, which are arranged at intervals on the outer periphery of the support portion 12, so as to support the support portion 12 and evenly disperse the force of the support portion 12 on the plane to avoid damage to the support portion 12 due to stress concentration.

[0043] In one embodiment, the connecting rod 13 is a screw rod, and the pressing member 42 is a nut. The pressing member 42 and the connecting rod 13 are threadedly matched to press the pressing rod 41 against the abutment surface 313. The threaded matching of the nut and the screw rod makes the contact between the pressing rod 41 and the abutment surface 313 tighter, preventing the connecting rod 13 and the pressing rod 41 from loosening or falling off, and making the entire structure more stable, ensuring the reliability of the connection, reducing the loosening caused by vibration or other external forces during the sampling process, and improving the stability and safety of the sampling system 100.

[0044] Please combine Figure 3 and Figure 5 Furthermore, the sampling machine 3 also includes a guide rail 32, a traveling frame 33, a driving module 34 and a sampling device 35. A plurality of columns 31 are connected at intervals to the bottom of the guide rail 32. The sampling device 35 is slidably connected to the guide rail 32 through the traveling frame 33. The driving device is used to drive the traveling frame 33 to slide along the guide rail 32. The sampling device 35 is used to sample raw grains. The negative pressure cabin 2 provides negative pressure to the sampling device 35 through the sampling pipeline 60. The guide rail 32 can be used in conjunction with the traveling frame 33 to reduce the friction resistance during the movement of the sampling device 35, so that the sampling device 35 can be driven to move along the guide rail 32 by the driving module 34 with lower power, which reduces the cost and the overall weight. At the same time, driving the sampling device 35 to move along the guide rail 32 by the driving module 34 can make the sampling range of the sampling device 35 larger, thereby improving the applicable scenarios,

[0045] Specifically, the sampling device 35 includes a rotating seat 351, a cantilever 352, a first connecting rod 353, a second connecting rod 354 and a sampling rod 355. The rotating seat 351 is rotatably mounted on the walking frame 33, the cantilever 352 is mounted on the rotating seat 351 and extends in a direction away from the rotating seat 351, the first connecting rod 353 is rotatably connected to the rotating seat 351 and is arranged parallel to the cantilever 352, the end of the first connecting rod 353 away from the rotating seat 351 is connected to the second connecting rod 354, the second connecting rod 354 is rotatably connected to the end of the cantilever 352 away from the rotating seat 351, the end of the second connecting rod 354 away from the first connecting rod 353 is connected to the sampling rod 355, and the sampling rod 355 is hollow and communicated with the sampling pipeline 60. Through the cooperation of the rotating seat 351, the walking frame 33, the guide rail 32 and the driving module 34, the insertion rod 355 can perform sampling operations in any direction of the extension path of the guide rail 32, thereby improving the sampling flexibility and the sampling range of the insertion rod 355. The first connecting rod 353 and the rotating seat 351 are rotatable, and the second connecting rod 354 and the cantilever 352 are rotatable to form a planar connecting rod mechanism, which further improves the rotation flexibility of the insertion rod 355. At the same time, the insertion rod 355 always remains in a vertical state during the downward insertion movement. First, it can ensure the accuracy of the downward insertion, and second, it can maintain a vertical path when inserting into the grain pile to avoid bending.

[0046] Please combine Figure 5 and Figure 7 In one embodiment, a buffer 36 is further provided on the rotating seat 351. The buffer 36 includes a sleeve 361, a telescopic shaft 362 and an elastic member 363. The telescopic shaft 362 is provided in the sleeve 361. The elastic member 363 is sleeved on the outside of the telescopic shaft 362 and is located between the telescopic shaft 362 and the sleeve 361. The elastic member 363 connects the sleeve 361 and the telescopic shaft 362. The telescopic shaft 362 is connected to the first connecting rod 353. In the actual sampling process, there may be a lateral displacement during the downward sampling process of the skewer 355. The buffer 36 buffers the lateral displacement of the skewer 355 during the downward sampling process through the connection between the telescopic shaft 362 and the first connecting rod 353, thereby preventing the skewer 355 from bending and being damaged, and extending the service life of the skewer 355.

[0047] Please combine Figure 1 and Figure 6In one embodiment, the negative pressure cabin 2 includes a shell 21, a negative pressure machine 22, a sample bin 23 and a temporary storage cabinet 24. An installation cavity is formed in the shell 21. The negative pressure machine 22, the sample bin 23 and the temporary storage cabinet 24 are all arranged in the installation cavity. The temporary storage cabinet 24 is connected to the sampling pipeline 60. The temporary storage cabinet 24 is used to screen grains and is provided with a storage cavity for temporarily storing grains. The negative pressure machine 22 is connected to the storage cavity and is used to generate negative pressure. The storage cavity is provided with an output pipeline connecting the storage cavity and the sample bin 23. The sample bin 23 is used to store grains and transport the grains to external inspection equipment through the sample grain pipeline. The shell 21 is used to protect the negative pressure machine 22, the sample bin 23 and the temporary storage cabinet 24 from the external environment to avoid damage, thereby extending the service life of the above-mentioned equipment. At the same time, the temporary storage cabinet 24, the negative pressure machine 22 and the sample bin 23 are all integrated in the negative pressure cabin 2, which is convenient for hoisting and installation, further improving the assembly efficiency and speed.

[0048] Please combine Figure 1 and Figure 8 In one embodiment, the sampling system 100 further includes a surplus grain return device 50, which includes a bracket 51, a cross arm 52, a rotary drive member 53 and a funnel 54. The cross arm 52 is installed on the guide rail 32 through the bracket 51, and the funnel 54 is located at the end of the cross arm 52 away from the bracket 51. The rotary drive member 53 is used to drive the cross arm 52 to rotate to drive the funnel 54 to rotate. The funnel 54 is connected to the storage chamber through the surplus grain pipeline and is used to transport the screened surplus grain. The rotary drive member 53 drives the cross arm 52 to drive the funnel 54 to return the surplus surplus grain in the storage chamber, which reduces the waste of grain and the sampling loss. The surplus grain can also be returned to the driver's vehicle, reducing the participation of personnel and reducing labor costs.

[0049] See also Figure 3 In one embodiment, the guide rail 32 includes a bottom plate 321 and two running parts 322. The bottom of the bottom plate 321 is provided with a column 31; the two running parts 322 are convexly arranged on the bottom plate 321 and are spaced apart on both sides of the bottom plate 321 in the width direction. The bottom of the traveling frame 33 is provided with a pulley 331, and the traveling frame 33 is in sliding contact with the two running parts 322 through the pulley 331. The sliding contact between the pulley 331 and the running part 322 can be limited by the pulley 331, thereby improving the stability of the traveling frame 33 and preventing the traveling frame 33 from deflecting. At the same time, the pulley 331 can run smoothly during the sliding process, so that the rod 355 is more stable during the movement process, and the vibration and the like are prevented from damaging the connecting structure of the rod 355, thereby improving the safety of the rod 355.

[0050] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sampling system, characterized in that: include: An installation platform, the installation platform comprising a platform portion and a plurality of support portions, the platform portion being provided with a negative pressure cabin, and each of the support portions being provided with a plurality of connecting rods; A sampling machine, the sampling machine is used to poke raw grains, the sampling machine is provided with a plurality of columns, the number of the columns is consistent with the number of the support parts and is arranged one by one, the bottom of the column is used to abut against the support part, when the column abuts against the support part, a plurality of connecting rods are arranged around the outer circumference of the column, and the negative pressure cabin is used to provide negative pressure for the sampling machine; Multiple clamping assemblies, each of which includes a clamping rod and a clamping piece. Both ends of each clamping rod are provided with a socket for the connecting rod to pass through. When the clamping rod is plugged into the socket, it abuts against the column. The clamping piece is used to clamp the clamping rod against the column.

2. The sampling system according to claim 1, characterized in that: The column includes a vertical rod and a base, the bottom of the base abuts against the support portion, the top of the base is connected to the vertical rod, the bottom of the base forms a step, the top surface of the step forms an abutment surface, and the pressure rod abuts against the abutment surface when plugged into the socket.

3. The sampling system according to claim 2, characterized in that: The support part and the base are both arranged in a rectangular parallelepiped, and four connecting rods are arranged on each of the support parts, and the four connecting rods are respectively arranged at four corners of the base.

4. The sampling system according to claim 2, characterized in that: The connecting rod is a screw rod, the pressing piece is a nut, and the pressing piece is threadedly matched with the connecting rod to press the pressing rod against the abutment surface.

5. The sampling system according to any one of claims 1 to 4, characterized in that: The sampling machine also includes a guide rail, a traveling frame, a driving module and a sampling device. A plurality of the columns are connected to the bottom of the guide rail at intervals. The sampling device is slidably connected to the guide rail through the traveling frame. The driving device is used to drive the traveling frame to slide along the guide rail. The sampling device is used to sample raw grains. The negative pressure cabin provides negative pressure to the sampling device through a sampling pipeline.

6. The sampling system according to claim 5, characterized in that: The sampling device includes a rotating seat, a cantilever, a first connecting rod, a second connecting rod and a sampling rod. The rotating seat is rotatably mounted on the walking frame, the cantilever is mounted on the rotating seat and extends in a direction away from the rotating seat, the first connecting rod is rotatably connected to the rotating seat and is arranged parallel to the cantilever, one end of the first connecting rod away from the rotating seat is connected to the second connecting rod, the second connecting rod is rotatably connected to one end of the cantilever away from the rotating seat, one end of the second connecting rod away from the first connecting rod is connected to the sampling rod, and the sampling rod is hollow and communicated with the sampling pipeline.

7. The sampling system according to claim 6, characterized in that: A buffer is also provided on the rotating seat, and the buffer includes a sleeve, a telescopic shaft and an elastic member. The telescopic shaft is arranged in the sleeve, and the elastic member is sleeved on the outside of the telescopic shaft and located between the telescopic shaft and the sleeve. The elastic member connects the sleeve and the telescopic shaft, and the telescopic shaft is connected to the first connecting rod.

8. The sampling system according to claim 6, characterized in that: The negative pressure cabin includes an outer shell, a negative pressure machine, a sample bin and a temporary storage cabinet. An installation cavity is formed in the outer shell. The negative pressure machine, the sample bin and the temporary storage cabinet are all arranged in the installation cavity. The temporary storage cabinet is connected with the sampling pipeline. The temporary storage cabinet is used to screen grains and is provided with a storage cavity for temporarily storing grains. The negative pressure machine is connected with the storage cavity and is used to generate negative pressure. The storage cavity is provided with an output pipeline connecting the storage cavity and the sample bin. The sample bin is used to store grains and transport the grains to external inspection equipment through the sample grain pipeline.

9. The sampling system according to claim 8, characterized in that: The sampling system also includes a residual grain return device, which includes a bracket, a cross arm, a rotating drive member and a funnel. The cross arm is installed on the guide rail through the bracket, and the funnel is located at an end of the cross arm away from the bracket. The rotating drive member is used to drive the cross arm to rotate to drive the funnel to rotate. The funnel is connected to the storage chamber through a residual grain pipeline and is used to transport the residual grain after screening.

10. The sampling system according to claim 5, characterized in that: The guide rail comprises: A base plate, the bottom of which is provided with the upright column; Two walking parts are protruded from the bottom plate and spaced apart on both sides of the bottom plate in the width direction. A pulley is provided at the bottom of the walking frame, and the walking frame is in sliding contact with the two walking parts through the pulley.

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