CN106441974B - An automatic sampler for agricultural products - Google Patents

Abstract

The invention relates to an automatic sampler for agricultural products, which includes a cup dividing mechanism, a sampling mechanism, a liquid-taking mechanism and a test tube feeding mechanism arranged on a workbench; the workbench is provided with a four-station turntable, which can be completed by rotating it once. The four steps of dropping the cup, sampling, taking liquid and recycling the old cup, combined with the design of the sampling mechanism, can be compatible with sampling of different agricultural products, simplifying the sampling process and difficulty; the liquid taking process also uses four stations to complete the liquid taking separately , releasing, withdrawing the suction nozzle, and installing a new suction nozzle are all completed in an arc-shaped space, forming an organic connection with the four-station turntable, making the structure more compact, with a high degree of automation, and the detection process does not require professional operation. It is widely used in all aspects of agricultural product production, sales and processing, replacing manual inspection with machinery, and automatically completing the processes of sampling, liquid extraction and inspection.

Description

An automatic sampler for agricultural products

Technical field:

The utility model belongs to the field of testing and sampling equipment, in particular to an automatic sampling instrument for agricultural products.

Background technique:

As food safety issues become prominent, more and more people begin to pay attention to food safety. In daily life, the first thing people pay attention to is whether the fruits, vegetables and meat on the table have pesticide residues. However, due to the cumbersome detection methods, complex inspection procedures and high operational requirements for pesticide residue detection in fruits, vegetables and meat on the market, most of them require professionals with a certain level of operation to carry out the detection. The timeliness of detection is not strong, the detection effect is not ideal, or even human negligence. How to provide a detection device with a high degree of automation, no need for professional detection personnel, and adaptable to various use environments has become the research object of the present invention.

Invention content:

The purpose of the utility model is to invent an automatic sampler for agricultural products that can automatically complete the sampling process before the detection of fruit, vegetable and meat products by machinery.

The technical scheme of the utility model is realized in the following way: an automatic sampler for agricultural products, including a workbench, a cup dividing mechanism, a sampling mechanism, a liquid taking mechanism and a test tube feeding mechanism; it is characterized in that:

Workbench: It has three layers of upper, middle and lower tables. The middle table is positioned with a ring-shaped turntable through bearings. There are a number of gaps evenly distributed on the circumference of the turntable. Each gap is provided with a supporting plate and a weighing sensor; An inner ring gear is fixed under the turntable; a station motor and a sampling motor are installed on the lower table, the station motor shaft drives a first gear, and the first gear meshes with the inner ring gear to drive the turntable to rotate to the design station; The cup dividing mechanism, sampling mechanism, liquid taking mechanism and test tube feeding mechanism are distributed on the upper table and the middle table, and the upper table is correspondingly provided with cup drop holes, sampling holes, liquid taking holes and drop tube holes leading to the middle table. ;

Cup-distributing mechanism: including cup-dividing seat, cup-dividing cover, outer ring gear, cup-dividing gear and stepping motor; On the cup-dividing seat, the plurality of cup-dividing gears are evenly distributed on the periphery of the outer ring gear, meshed with the outer ring gear, and constrained between the cup-dividing seat and the cup-dividing cover; the cup-dividing gear is fixed with a cup-dividing helical wheel, The nested sampling cups are supported by a plurality of cup-dividing helical wheels, and the support of a sampling cup can be removed by one rotation of the cup-dividing helical wheels. The supporting plate corresponding to the turntable; the output of the stepping motor is connected to the transmission of the outer ring gear;

Sampling mechanism: including the feed assembly installed on the upper table and the sampling tool assembly installed on the middle table; the feed assembly includes feed seat, feed motor, screw rod, slider and cup holder; feed motor and The screw rods are respectively positioned on both sides of the feed seat, and are connected by gear pair transmission; the slider is slidably positioned on the guide rail of the cup holder, and cooperates with the screw rod through the screw nut, and the screw rod drives the slider to move up and down, and drives the The cup holder fixed on the lower part of the slider is lifted, and the cup holder can descend through the sampling hole; the cup holder has a cup cavity, which can accommodate and position the collection cup; the sampling tool assembly includes a sampling motor, The gearbox and the cutter, the sampling motor shaft drives the cutter to rotate through the gearbox; the cutter is a conical structure made of several triangular blades, the top of the cutter faces the collection cup, and the bottom faces the sampling cup on the pallet;

Liquid-taking mechanism: including the liquid-taking seat and the suction pipe assembly, the suction pipe assembly is movably positioned on the liquid-taking seat by means of the lifting seat, one side of the lifting seat is positioned on the guide column of the liquid-taking seat through a linear bearing, and the other is There is a rack on the side; a liquid-taking gear driven by the lifting steering gear is set on the liquid-taking device seat, and the liquid-taking gear meshes with the rack to drive the lifting seat with the suction pipe assembly to reciprocate and lift; the liquid-taking gear The device base is positioned on the upper table through a rotating shaft, and the rotating shaft is fixed with a swing gear, which meshes with the gear on the output shaft of the liquid-taking motor fixed on the bottom of the upper table, and the suction pipe assembly is driven by the liquid-taking motor in different working stages. Complete suction, release and replacement of suction nozzles at one position; a suction nozzle material seat is set on the middle platform of the swing track of the suction pipe assembly;

Test tube feeding mechanism: including the bin assembly installed on the upper table and the test tube rotating seat movably positioned on the middle table. The discharged upright test tubes fall into the test tube rotating seat directly below one by one, waiting to receive the sampling liquid released by the straw assembly.

The gearbox of the sampling cutter assembly drives a pair of cutters, which are symmetrically distributed on both sides of the sampling motor shaft, and the cutters and the gearbox can rotate around the sampling motor shaft.

The gearbox in the sampling tool assembly is positioned on the sampling motor shaft through bearings, and the fixed gear on the sampling motor shaft meshes with a pair of symmetrically distributed cutter gears in the gearbox, and the cutter gears are positioned on the gear shifting shaft through the hollow shaft. On the box, the bottom of the tool is locked on the upper surface of the hollow shaft; a sleeve is set on the shaft of the sampling motor, the upper end of the sleeve is locked on the gearbox, and a large gear is fixed on the lower end. The second driving gear arranged on the bit motor shaft meshes, and when the turntable is driven by the bit motor to change positions, a pair of cutters are synchronously changed positions.

The suction pipe assembly includes a suction pipe, a pipe sleeve, a lifting seat and a liquid suction steering gear; the pipe sleeve is set outside the suction pipe, and the two are respectively positioned on the lifting seat. Can be touched by the liquid extractor seat, and force the sleeve to move downward relative to the suction pipe, and can push out the suction nozzle sleeved at the lower end of the suction pipe to realize the action of replacing the suction nozzle; the liquid suction steering gear drives a cam, and the cam Contrasted with the piston end of the straw, the cam rotates to drive the suction or release action of the straw.

The silo assembly has a feed hopper, a circular chamber, a rotating test tube fork and a pipe outlet; the thickness of the circular chamber can accommodate a test tube, and the pipe outlet is in a vertical downward direction tangent to the circular chamber, and the feed hopper Cut into the circular cavity at the bottom; the rotating test tube fork is installed on the center of the circular cavity. The rotating test tube fork has a plurality of radial radial fork handles, and a tangential fork rod is arranged at the front end of the fork handle, and the plurality of fork rods rotate toward the same direction. When rotating, hook up the inverted test tubes from the bottom of the feeding hopper, and send them into the outlet port after half a circle of rotation, and discharge them one by one into the test tube rotating seat directly below; the test tube rotating seat is evenly distributed on the same circumference. The test tube jacks are driven by the tube base motor, and the test tube jacks on the test tube rotating seat are located directly below the tube outlet one by one to accommodate the falling test tubes.

There are four notches on the turntable, which correspond to the cup dropping, sampling, liquid taking and recovery stations respectively.

The turntable is provided with a baffle on the rear edge of the notch; the recovery station is correspondingly provided with a sampling cup guide plate, which is fixed at the bottom of the upper table and extends to the outer edge of the turntable.

The utility model replaces the manual detection with machinery, and automatically completes the processes of sampling, liquid extraction, and detection. In particular, the four-station turntable is used to complete the four steps of cup dropping, sampling, liquid extraction, and recycling of old cups after one rotation. With the design of the sampling mechanism, it is compatible with the sampling of different agricultural products, simplifying the sampling process and difficulty; the liquid extraction process also adopts four stations, which respectively complete the liquid extraction, release, suction nozzle retraction, and new suction nozzle, and in an arc It is completed within the space and forms an organic connection with the four-station turntable, making the structure more compact, with a high degree of automation, and the detection process does not require professional operation. It can be widely used in various links of agricultural product production, sales and processing.

Description of drawings:

Below in conjunction with specific legend the utility model is further described:

Figure 1 Stereoscopic schematic diagram of sampler

Figure 2 Schematic diagram of three-layer workbench decomposition of the sampler workbench

Schematic diagram of tabletop decomposition in Figure 3

Fig. 4 exploded schematic diagram of the cup distributing mechanism

Figure 5 Schematic diagram of the positional relationship between the feed assembly and the sampling tool assembly

Figure 6 Schematic diagram of the cross-section of the sampling tool assembly

Figure 7 Stereoscopic schematic diagram of the liquid taking mechanism

Figure 8 Schematic diagram of test tube feeding mechanism

in

11—Top table 111—Cup drop hole 112—Sampling hole 113—Liquid extraction hole

114—drop pipe hole 12—middle table 13—lower table 2—turntable

21—notch 22—supporting plate 23—load cell 24—inner ring gear

25—station motor 26—first gear 27—second gear 28—baffle plate

29—guiding plate 31—cup holder 310—through hole 32—cup cover

33—outer ring gear 34—cup gear 341—cup helical wheel 35—stepping motor

4—feed assembly 41—feed base 42—feed motor 43—screw

44—slider 45—cup holder 46—gear pair 47—cup holder guide rail

5—sampling tool assembly 51—sampling motor 511—sampling motor shaft 52—gearbox

521—gear 522—cutter gear 523—hollow shaft 524—shaft sleeve

525—big gear 53—knife 6—suction tube assembly 61—liquid collector seat

611—Guide column 612—Filling gear 613—Swing gear 62—Elevating seat

621—Linear bearing 622—Rack 63—Liquid extraction motor 64—Suction nozzle seat

65—suction tube 66—sleeve 67—cam 68—storage bucket

69—Universal wheel 7—Storage assembly 71—Feed hopper 72—Circular cavity

73—Rotating test tube fork 731—Fork handle 732—Fork rod 74—Tube outlet

8—Test tube rotating seat 81—Test tube socket 82—Tube base motor 9—Sampling cup

91—collection cup 92—suction nozzle 93—test tube

Detailed ways:

Referring to Figure 1, Figure 2 and Figure 3, the automatic sampler for agricultural products includes a workbench, a cup dividing mechanism, a sampling mechanism, a liquid taking mechanism and a test tube feeding mechanism; wherein:

Worktable: It has a three-layer structure of upper table 11, middle table 12 and lower table 13. The middle table 12 is positioned with a ring-shaped turntable 2 through bearings. There are several gaps 21 evenly distributed on the circumference of the turntable 2. Each gap 21 A supporting plate 22 and a load cell 23 are provided; an internal ring gear 24 is fixed below the turntable 2; a station motor 25 and a sampling motor are installed on the lower table 13, and the station motor shaft drives a first gear 26, which is connected to the The ring gear 24 is engaged, and the turntable 2 is driven to rotate to the design station.

Specifically, the turntable 2 is provided with four notches 21, which correspond to the stations of cup dropping, sampling, liquid extraction and recovery respectively, that is, the turntable 2 rotates once, and the sampling cups 9 on each pallet 22 can complete the entire process. . In order to recover the sampling cup 9 smoothly, the turntable 2 is provided with a baffle plate 28 after the notch rotates; Push the used sampling cup out to the outside of the turntable and fall into the receiving collection bucket.

On the upper table 11 and the middle table 12, there are also a cup dividing mechanism, a sampling mechanism, a liquid taking mechanism and a test tube feeding mechanism, and the upper table 11 is correspondingly provided with a cup drop hole 111 leading to the middle table 12, a sampling hole 112, Liquid intake hole 113 and drop tube hole 114.

With reference to Fig. 4, the cup dividing mechanism: includes a cup dividing seat 31, a dividing cup cover 32, an outer ring gear 33, a dividing cup gear 34 and a stepping motor 35; the dividing cup seat 31 and the dividing cup cover 32 have a cup drop through hole 310, The outer ring gear 33 and the through hole 310 are concentrically rotated and positioned on the cup holder 31. A plurality of cup gears 34 are evenly distributed on the periphery of the outer ring gear 33, meshed with the outer ring gear 33, and are constrained between the cup holder 31 and the cup holder. Between the covers 32; the cup-dividing screw wheel 34 is fixed on the cup-dividing screw wheel 341, and the sampling cups 9 nested together are supported by a plurality of cup-dividing spiral wheels 341, and the cup-dividing spiral wheel 341 can be removed for one rotation. The support of the sampling cup 9, the sampling cup falls from the through hole 310, the cup drop hole 111 on the middle table surface to the supporting plate 22 corresponding to the turntable 2; The driver realizes the cup splitting action.

5 and 6, the sampling mechanism: includes the feed assembly 4 installed on the upper table 11 and the sampling tool assembly 5 installed on the middle table 12; the feed assembly 4 includes a feed seat 41, a feed motor 42 , screw mandrel 43, slide block 44 and cup holder 45; feed motor 42 and screw mandrel 43 are respectively positioned on the two sides of feed seat 41, and are connected by transmission of gear pair 46, drive screw mandrel 43 front and back by feed motor 42 Rotation; slide block 44 is slidably positioned on the cup holder guide rail 47, and cooperates with the screw mandrel 43 through the screw nut, the slide block 44 is driven by the screw mandrel 43 to move up and down, and drives the cup holder 45 fixed on the bottom of the slide block 44 to lift. The cup holder 45 can gradually descend through the sampling hole 112 to complete the sampling action; the cup holder 45 has a cup cavity, which can accommodate and position the collection cup 91, which is used to hold the lump samples taken from the agricultural products.

The sampling tool assembly 5 includes a sampling motor 51, a gearbox 52 and a cutter 53. The sampling motor shaft 511 drives the cutter 53 to rotate through the gearbox 52, and cuts the agricultural product block sample in the collection cup 91, cutting it into powder or lake shape; Cutter 53 is a conical structure built by several triangular blades 531. The top of cutter 53 is facing the collection cup 91, and the bottom is facing the sampling cup 9 on the supporting plate. The cutting powder directly falls into the sampling cup 9; further Said, the gearbox 52 of the sampling cutter assembly 5 drives a pair of cutters 53, and the pair of cutters 53 are symmetrically distributed on both sides of the sampling motor shaft, and the cutter 53 and the gearbox 52 can rotate around the sampling motor shaft 511 to switch the cutters 53, So that one is in the cutting operation, and the other is in the cleaning state, alternately, which not only ensures the sampling efficiency, but also does not cause cross-contamination.

Specifically, the gearbox 52 in the sampling tool assembly 5 is positioned on the sampling motor shaft 511 through a bearing, and the fixed gear 521 on the sampling motor shaft 511 meshes with a pair of symmetrically distributed cutter gears 522 in the gearbox. 522 is positioned on the gearbox 52 through the hollow shaft 523, and the bottom of the tool 53 is locked on the upper end surface of the hollow shaft 523; the sampling motor shaft 511 is provided with a bushing 524, and the upper end of the bushing 524 is locked on the gearbox 52 , lower end is fixed with a large gear 525, and this large gear 525 meshes with the second drive gear 27 that is provided with on the station motor 25 shafts, and when the station motor drives the rotating disk 2 transposition, a pair of cutters 53 are synchronously transposed. The cutter gear 522 and the hollow shaft 523 can be a connected structure as in this example, or can be a split structure.

Referring to Fig. 7, the liquid-taking mechanism: includes the suction pipe assembly 6 and the liquid-taking device seat 61, the suction pipe assembly 6 is movably positioned on the liquid-taking device seat 61 by means of the elevating seat 62, and one side of the elevating seat 62 is positioned on the On the guide post 611 of the liquid extractor seat 61, a rack 622 is arranged on the other side; on the liquid extractor seat 61, a liquid extractor gear 612 driven by the lifting steering gear is arranged, and the liquid extractor gear 612 meshes with the rack gear 622 to drive Lifting seat 62 with suction pipe assembly 6 moves up and down reciprocally; said liquid collector seat 61 is positioned on the upper table 11 through a rotating shaft, and a swinging gear 613 is fixed on the rotating shaft, and the swinging gear 613 is fixed on the bottom surface of the upper table 11. The gears on the output shaft of the liquid-taking motor 63 are engaged, and the suction pipe assembly 6 is driven by the liquid-taking motor 63 to complete suction, release and replacement of suction nozzles at different stations; Suction nozzle material seat 64, clean suction nozzle 92 is prepared in the suction nozzle material seat 64, so that after each extraction and release are completed, new suction nozzles 92 are replaced to avoid cross-contamination. In order to keep the liquid-taking seat 61 running smoothly, a universal wheel 69 is provided at the hanging end, and the universal wheel 69 can roll on the upper table 11 to support the swinging operation of the liquid-taking seat 61 .

More specifically, the suction pipe assembly 6 includes a suction pipe 65, a pipe sleeve 66, a lifting seat 62 and a liquid suction steering gear; When the lifting seat 62 is raised to a high position, it can be touched by the liquid extractor seat 61 and force the sleeve 66 to move downward relative to the suction pipe 65, so that the suction nozzle sleeved at the lower end of the suction pipe 65 can be pushed out. 92, to realize the action of replacing the suction nozzle; the suction steering gear drives a cam 67, which is in contact with the piston end of the suction pipe 65, and the rotation of the cam 67 drives the suction pipe 65 to suck liquid or release the sampling liquid.

As shown in Figure 2, the trajectory of the suction pipe assembly 6 is an arc, so the liquid-taking hole 113 provided on the upper table 11 is also arc-shaped. A test tube socket 81 and the turntable 2-supporting plate 22 are directly above, to complete the action of taking liquid and releasing the sampling liquid; on the middle table 12 between the test tube rotating seat 8 and the turntable 2, a nozzle material seat 64 and a storage bucket are arranged 68. The storage bucket 68 is used to collect the replaced suction nozzles 92 or introduce them into the storage bucket below. When the suction pipe assembly 6 moves to these two stations, finish moving back the used suction nozzle 92, put a new suction nozzle from the suction nozzle material seat 64, then move to the rotating disk 2 places, and then inhale the sampling liquid.

With reference to Fig. 8, the test tube feeding mechanism: including the feed bin assembly 7 installed on the upper table 11 and the test tube rotating seat 8 movably positioned on the middle table 12, the feed bin assembly 7 is embedded in the drop tube hole of the upper table 11 114 in.

The feed bin assembly 7 has a feed hopper 71, a circular chamber 72, a rotating test tube fork 73 and a pipe outlet 74; In the downward direction, the circular cavity 72 is cut below the feeding hopper 71; the rotating test tube fork 73 is installed on the center of the circular cavity 72, and the rotating test tube fork 73 has a plurality of radial radial fork handles 731, and the front end of the fork handle 731 is provided with Tangential to the fork bar 732, a plurality of fork bar 732 faces the same rotation direction, hooks the inverted test tube 93 from the bottom of the feed hopper 71 during rotation, sends it into the outlet port 74 after half a circle of rotation, and discharges it from the outlet port 74 The test tubes 93 fall into the test tube rotating seat 8 directly below one by one, waiting to receive the sampling liquid released by the straw assembly 6;

3, a plurality of test tube sockets 81 are evenly distributed on the same circumference of the test tube rotating seat 8. Driven by the tube seat motor 82, the test tube sockets 81 on the test tube rotating seat are located directly below the outlet port 74 one by one. Dropped into the test tube 93. After the test tube 93 is injected with the sampling liquid, it is manually taken away and placed in the detection box for detection.

Claims (7)

1. An automatic sampling instrument for agricultural products comprises a workbench, a cup separating mechanism, a sampling mechanism, a liquid taking mechanism and a test tube feeding mechanism; the method is characterized in that:

a working table: the turntable is provided with an upper layer of table top, a middle layer of table top and a lower layer of table top, the middle layer of table top is positioned with a turntable with an annular structure through a bearing, a plurality of notches are uniformly distributed on the circumference of the turntable, and a supporting plate and a weighing sensor are arranged on each notch; an annular gear is fixed below the turntable; the lower table top is provided with a station motor and a sampling motor, a station motor shaft drives a first gear, the first gear is meshed with the annular gear, and the turntable is driven to rotate to a design station; the cup separating mechanism, the sampling mechanism, the liquid taking mechanism and the test tube feeding mechanism are distributed on the upper table top and the middle table top, and the upper table top is correspondingly provided with a cup falling hole, a sampling hole, a liquid taking hole and a tube falling hole which lead to the middle table top;

cup separating mechanism: comprises a cup separating seat, a cup separating cover, an outer gear ring, a cup separating gear and a stepping motor; the outer tooth wheel and the through hole are concentrically and rotatably positioned on the cup separating seat, and a plurality of cup separating gears are uniformly distributed on the periphery of the outer tooth wheel, meshed with the outer tooth wheel and restrained between the cup separating seat and the cup separating cover; a cup separating spiral wheel is fixed on the cup separating gear, a plurality of cup separating spiral wheels jointly support the sample cups which are nested together, the cup separating spiral wheel rotates for a circle to remove the support of one sample cup, and the sample cup falls from the through hole, the cup falling hole on the middle table surface and falls onto the supporting plate corresponding to the turntable; the output of the stepping motor is in transmission connection with the outer teeth;

sampling mechanism: comprises a feeding assembly arranged on the upper table top and a sampling cutter assembly arranged on the middle table top; the feeding assembly comprises a feeding seat, a feeding motor, a screw rod, a sliding block and a cup seat; the feeding motor and the screw rod are respectively positioned at two sides of the feeding seat and are in transmission connection through the gear pair; the sliding block is positioned on the cup seat guide rail in a sliding way, is matched with the screw rod through the screw nut, drives the sliding block to move up and down by the screw rod, and drives the cup seat fixed at the lower part of the sliding block to move up and down, and the cup seat can descend to pass through the sampling hole; the cup seat is provided with a cup cavity which can accommodate and position the collecting cup; the sampling cutter assembly comprises a sampling motor, a gearbox and a cutter, wherein a sampling motor shaft drives the cutter to rotate through the gearbox; the cutter is of a conical structure built by a plurality of triangular blades, the upper part of the cutter faces the collecting cup, and the lower part of the cutter faces the sampling cup on the supporting plate;

liquid taking mechanism: the liquid taking device comprises a liquid taking device seat and a suction pipe assembly, wherein the suction pipe assembly is movably positioned on the liquid taking device seat by virtue of a lifting seat, one side of the lifting seat is positioned on a guide post of the liquid taking device seat by virtue of a linear bearing, and the other side of the lifting seat is provided with a rack; the liquid taking device seat is provided with a liquid taking gear driven by a lifting steering engine, and the liquid taking gear is meshed with the rack to drive the lifting seat to reciprocate with the suction pipe assembly; the liquid taking device seat is positioned on the upper table top through a rotating shaft, a swing gear is fixed on the rotating shaft and meshed with a gear on an output shaft of a liquid taking motor fixed on the bottom surface of the upper table top, and the liquid taking motor drives a suction pipe assembly to finish the actions of sucking liquid, releasing and replacing a suction nozzle at different stations; a suction nozzle material seat is arranged on the middle table surface of the swing track of the suction pipe assembly;

test tube feed mechanism: the automatic sampling device comprises a bin assembly arranged on an upper table top and a test tube rotating seat movably positioned on a middle table top, wherein the bin assembly is embedded in a pipe falling hole of the upper table top, and directly-arranged test tubes discharged from the pipe outlet of the bin assembly fall into the test tube rotating seats right below one by one to wait for receiving sampling liquid released by the suction tube assembly.

2. The automatic agricultural product sampling instrument according to claim 1, characterized in that: the gearbox of sampling cutter assembly drives has a pair of cutter, and a pair of cutter symmetry distributes in sampling motor shaft both sides, and cutter and gearbox can rotate around the sampling motor shaft.

3. An automatic sampler for agricultural products according to claim 1 or 2, characterized in that: the gearbox in the sampling cutter assembly is positioned on a sampling motor shaft through a bearing, a gear fixed on the sampling motor shaft is meshed with a pair of symmetrically distributed cutter gears in the gearbox, the cutter gears are positioned on the gearbox through a hollow shaft, and the bottom of a cutter is locked on the upper end face of the hollow shaft; the sampling motor shaft is sleeved with a shaft sleeve, the upper end part of the shaft sleeve is locked on the upper end part and the lower end part of the gearbox, a large gear is fixed on the upper end part and the lower end part of the shaft sleeve, the large gear is meshed with a second driving gear arranged on the station motor shaft, and the station motor drives the turntable to shift and synchronously shift a pair of cutters.

4. The automatic agricultural product sampling instrument according to claim 1, characterized in that: the straw assembly comprises a straw, a pipe sleeve, a lifting seat and a liquid suction steering engine; the pipe sleeve is sleeved outside the suction pipe, the pipe sleeve and the suction pipe are respectively positioned on the lifting seat, the abduction part at the top end of the pipe sleeve can be contacted by the liquid extractor seat when the lifting seat is lifted to be close to the high position, the pipe sleeve is forced to downwards shift relative to the suction pipe, and the suction nozzle sleeved at the lower end part of the suction pipe can be ejected out to realize the action of replacing the suction nozzle; the liquid suction steering engine drives a cam which is abutted against the piston end of the suction pipe, and the cam rotates to drive the suction pipe to suck or release.

5. The automatic agricultural product sampling instrument according to claim 1, characterized in that: the feed bin assembly is provided with a feed hopper, a circular cavity, a rotary test tube fork and a discharge port; the thickness of the circular cavity can accommodate a test tube, the outlet pipe opening is positioned in the vertical downward direction tangential to the circular cavity, and the lower part of the feed hopper cuts into the circular cavity; the rotary test tube fork is arranged on the center of the circular cavity, the rotary test tube fork is provided with a plurality of radial fork handles, the front ends of the fork handles are provided with tangential fork rods, the plurality of fork rods face the same rotation direction, the inverted test tubes are hooked from the lower part of the feed hopper during rotation, and the test tubes are sent into the pipe opening after half a period of rotation and are discharged one by one into the test tube rotating seat which falls under the feed hopper; the test tube rotating seat is characterized in that a plurality of test tube jacks are uniformly distributed on the same circumference of the test tube rotating seat, and under the drive of a tube seat motor, the test tube jacks on the test tube rotating seat are located under the tube outlet one by one to accept the dropped test tubes.

6. The automatic agricultural product sampling instrument according to claim 1, characterized in that: four notches are arranged on the rotary table and correspond to the cup falling, sampling, liquid taking and recycling stations respectively.

7. An automatic sampler for agricultural products according to claim 1 or 6, characterized in that: the rotating disk is provided with a baffle plate at the rotating rear edge of the notch; the recovery station is correspondingly provided with a sampling cup guide plate which is fixed at the bottom of the upper table top and extends to the outer edge of the turntable.

Images