Multi-channel coal sample sampling device

Abstract

The invention discloses a multi-channel coal sample sampling device which comprises a mounting plate and a plurality of sampling pipes rotationally arranged on the mounting plate, spiral blades are arranged on the outer sides of the sampling pipes, and a power assembly used for driving the sampling pipes to rotate is arranged on the mounting plate. The sampling pipe extends into a coal pile in a spiral ascending and spiral descending manner; the bottom of each sampling pipe is sharp, sampling ports for coal samples to enter are formed in the two sides of the sharp shape, and blocking assemblies capable of opening and closing the sampling ports are arranged on the two sides of the sharp shape. According to the invention, by arranging the plurality of sampling pipes, the sampling time can be greatly shortened, and the sampling efficiency is improved, so that the parking time of a vehicle can be shortened, and the in-out efficiency of the vehicle is improved; and meanwhile, the sampling pipe is inserted into the coal pile in a spiral downward drilling manner, so that the loss of the sampling head is relatively small, and the service lives of the sampling head and the sampling mechanical arm can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of coal sample collection equipment, and particularly relates to a multi-channel coal sample sampling device. Background Art

[0002] Before the coal of a vehicle enters a power plant, it is necessary to collect coal samples. The current automated sampling method is that the vehicle moves to a designated position and stops, and then the sampling robotic arm moves the sampling head above the vehicle, and then inserts the sampling head into the vehicle. After reaching the designated depth, sampling starts, and then the sampled coal sample is transported to the coal sample transmission equipment by the robotic arm and transmitted to the subsequent coal sample processing equipment through the coal sample transmission equipment.

[0003] The above-mentioned automated sampling device has the following deficiencies: 1. Generally, when sampling, multiple sampling points are selected for sampling at different positions and different depths. However, the traditional sampling device has only one sampling head, with slow efficiency and long vehicle parking time, which affects the vehicle entry and exit efficiency.

[0004] 2. When the traditional sampling head is inserted into the coal pile, there is a large resistance. The traditional method is to vibrate to make the sampling head smoothly inserted, but this method causes greater wear and tear on the sampling head and the sampling head is not durable enough. There is room for improvement, so a multi-channel coal sample sampling device is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-channel coal sample sampling device aiming at the above deficiencies currently.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions: A multi-channel coal sample sampling device includes a mounting plate and a plurality of sampling tubes rotatably arranged on the mounting plate. A spiral blade is arranged on the outer side of the sampling tube. A power assembly for driving the sampling tube to rotate is arranged on the mounting plate, and the sampling tube extends into the coal pile in a spiral ascending and spiral descending manner.

[0007] The bottom of each sampling tube is pointed, and sampling ports for coal samples to enter are provided on both sides of the pointed part, and a blocking assembly capable of opening and closing the sampling ports is arranged.

[0008] Further, a screw conveyor is arranged inside the sampling tube. The top of the screw conveyor is rotatably arranged on the mounting plate, and the bottom end of the screw conveyor extends to the sampling port. A transmission assembly is also included for driving the screw conveyor to rotate to drive the coal sample inside the sampling tube to rise and fall.

[0009] Further, the power assembly includes a driving wheel, a power component for driving the driving wheel to rotate, a transmission wheel arranged outside the sampling tube, and a transmission belt that bypasses the driving wheel and each transmission wheel and drives each transmission wheel to rotate synchronously.

[0010] Further, the transmission assembly includes an internal gear ring provided at the inner top end of the sampling tube. A gear is provided at the top of the auger corresponding to the position of the internal gear ring. An idler gear is meshed between the gear and the internal gear ring, and the idler gear is rotationally meshed with the gear and the internal gear ring respectively.

[0011] Further, the overall shape of the sampling tube is a cone with a larger upper part and a smaller lower part, and the overall shape of the auger is also a cone with a larger upper part and a smaller lower part;

[0012] A lifting device is further provided on the mounting plate for moving the entire auger up and down in the sampling tube.

[0013] Further, the mounting plate includes two spaced plate bodies, the upper and lower plate bodies are connected together by connecting columns. The lifting device includes a lifting plate located between the upper and lower plate bodies. The end of the auger is rotatably mounted on the lifting plate. A telescopic unit is provided at the bottom of the mounting plate, and the telescopic end of the telescopic unit passes through one of the plate bodies and is connected to the lifting plate to drive the lifting plate to move up and down.

[0014] Further, discharge ports for discharging coal samples are respectively provided on one side of the top of each sampling tube. A rotating ring is rotatably provided at the position corresponding to the discharge port on the outside of the sampling tube. An opening for communicating with the discharge port is provided on the rotating ring. The opening is obliquely downwardly communicated with a sample discharge channel. The output ends of each channel are commonly communicated with a temporary storage bin, and the bottom of the temporary storage bin can be automatically opened and closed.

[0015] Further, the spiral direction of the spiral blade on the auger is opposite to that on the sampling tube, and the rotation direction of the auger is also opposite to that of the sampling tube.

[0016] Further, the blocking assembly includes a sealing plate for blocking the sampling port. The sealing plate is slidably provided in the sampling tube. A rotating block is rotatably provided at the inner bottom of the sampling tube. The bottom of the sealing plate is connected to the rotating block and rotates together with the rotating block;

[0017] A through hole is provided in the middle of the rotating block. A guide rod fixedly connected to the sampling tube is vertically provided in the through hole. A spiral guide groove is provided on the guide rod. A sleeve is sleeved outside the guide rod. A guide block slidably matched with the spiral guide groove is provided on the sleeve. A spring is further provided between the sleeve and the guide rod. The spring is used to push the sleeve to move away from the guide rod. The sleeve can only move up and down relative to the rotating block and can drive the rotating block to rotate. A rotating plate is rotatably provided on the side of the sleeve away from the guide rod. The rotating plate is used to abut against the bottom of the auger;

[0018] When the auger is in the working state, the bottom of the auger contacts the rotating plate and pushes the sleeve downward to make the sleeve rotate. The rotating sleeve drives the rotating block to rotate, causing the sealing plate to displace and releasing the sealing of the sampling port.

[0019] The beneficial effects of the present invention are reflected in:

[0020] In the present invention, the setting of multiple sampling tubes can greatly shorten the sampling time, improve the sampling efficiency, and further shorten the parking time of the vehicle and improve the entry and exit efficiency of the vehicle; at the same time, the sampling tubes are inserted into the coal pile in the form of spiral drilling. In this way, the loss of the sampling head is relatively small, and the service life of the sampling head and the sampling robotic arm can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional view of the present invention;

[0022] Figure 2 is a sectional view of the present invention;

[0023] Figure 3 is Figure 2 an enlarged view of part A in

[0024] Figure 4 is a schematic structural view of the sealing component described in the present invention.

[0025] In the figure:

[0026] 1. mounting plate;

[0027] 2. sampling tube; 21. spiral blade; 22. sampling port; 23. discharge port; 24. rotating ring; 25. sample discharge channel; 26. temporary storage bin;

[0028] 3. power component; 31. driving wheel; 32. power member; 33. driven wheel; 34. transmission belt;

[0029] 4. sealing component; 41. sealing plate; 42. rotating block; 43. guide rod; 44. sleeve; 45. spring; 46. rotating plate;

[0030] 5. auger; 51. gear;

[0031] 6. transmission component; 61. internal gear ring; 62. idler gear;

[0032] 7. lifting device; 71. lifting plate; 72. telescopic unit. DETAILED DESCRIPTION OF THE INVENTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0034] Please refer to Figures 1-4 , the present invention discloses a multi-channel coal sample sampling device, which includes a mounting plate 1 and a plurality of sampling tubes 2 rotatably arranged on the mounting plate 1. A spiral blade 21 is arranged on the outer side of the sampling tube 2. A power assembly 3 for driving the sampling tube 2 to rotate is arranged on the mounting plate 1, and the sampling tube 2 extends into the coal pile in a spiral ascending and spiral descending manner;

[0035] The bottom of each sampling tube 2 is pointed, and sampling ports 22 for coal samples to enter are provided on both sides of the pointed shape, and a blocking assembly 4 capable of opening and closing the sampling ports 22 is provided.

[0036] In specific implementation, the mounting plate 1 is connected to the sampling robotic arm, and each sampling tube 2 is driven by the sampling robotic arm to move for sampling. During sampling, the power assembly 3 drives the sampling tube 2 to rotate while the sampling robotic arm drives the sampling tube 2 to move downward. Since the bottom of the sampling tube 2 is pointed, the sampling tube 2 extends into the coal pile on the vehicle in a spiral drilling form. Due to the use of the spiral blade 21, when it rotates, it helps the sampling tube 2 move downward better by simultaneously having the functions of "displacing coal" and "generating a downward force". In this way, the downward pushing load design of the sampling robotic arm does not need to be designed so large, and the setting of the vibration motor is also eliminated (the use of the vibration motor easily makes the sampling robotic arm in a long-term vibration state, affecting the service life); after reaching the specified depth downward, the blocking assembly 4 is opened, and then the sampling tube 2 continues to rotate, and the coal sample will enter the sampling tube 2 through the sampling port 22. After sampling is completed, the blocking assembly 4 can be closed, and then the sampling tube 2 is reversed (this is convenient for pulling out the sampling tube 2). After the sampling tube 2 is pulled out, the sampling robotic arm drives the sampling tube 2 to move to the entrance of the coal sample transmission device, the blocking assembly 4 is opened again, the sampling port 22 is opened, and the coal sample falls from the sampling port 22 to complete the collection of the coal sample.

[0037] In the present invention, the setting of a plurality of sampling tubes 2 can greatly shorten the sampling time, improve the sampling efficiency, and further shorten the parking time of the vehicle and improve the entry and exit efficiency of the vehicle; at the same time, the sampling tube 2 is inserted into the coal pile in a spiral drilling form, and the loss of the sampling head is relatively small in this way, which can improve the service life of the sampling head and the sampling robotic arm.

[0038] Preferably, since this application does not involve improvements to the sampling robotic arm, and the specific structure of the sampling robotic arm also belongs to the common knowledge of those skilled in the art (a structure similar to a cross slide), the specific structure of the sampling robotic arm will not be elaborated here.

[0039] In one embodiment, a screw conveyor 5 is arranged inside the sampling tube 2. The top of the screw conveyor 5 is rotatably arranged on the mounting plate 1, and the bottom end of the screw conveyor 5 extends to the sampling port 22. A transmission assembly 6 is further included, which is used to drive the screw conveyor 5 to rotate, driving the coal sample inside the sampling tube 2 to rise and fall. With this design, the addition of the screw conveyor 5 can increase the sampling volume that a single sampling tube 2 can accommodate, vertically stacking the coal sample in the sampling tube 2. When discharging, reversing the screw conveyor 5 can push the coal sample out from the sampling port 22, accelerating the discharge of the coal sample.

[0040] In one embodiment, the power assembly 3 includes a driving wheel 31, a power member 32 for driving the driving wheel 31 to rotate, a transmission wheel 33 arranged outside the sampling tube 2, and a transmission belt 34 that bypasses the driving wheel 31 and each transmission wheel 33 and drives each transmission wheel 33 to rotate synchronously.

[0041] In specific implementation, the power member 32 can be a motor. The driving wheel 31 is installed on the output shaft of the motor. The driving wheel 31 and the transmission wheel 33 can be sprockets, synchronous belt pulleys, belt pulleys, etc., and the transmission belt 34 can be a transmission chain, synchronous belt, belt, etc. By driving the power member 32, each transmission wheel 33 rotates, and each transmission wheel 33 drives each sampling tube 2 to rotate synchronously.

[0042] Preferably, the bottom heights of each sampling tube 2 can be set to be the same or different. When the bottom heights are the same, multiple samplings at the same height can be achieved in one operation; when the bottom heights are different, one sampling can be taken at different heights respectively in one operation.

[0043] In one embodiment, the transmission assembly 6 includes an internal gear ring 61 arranged at the inner top of the sampling tube 2. A gear 51 is arranged at the top of the screw conveyor 5 corresponding to the position of the internal gear ring 61. An idler gear 62 is meshed between the gear 51 and the internal gear ring 61. The idler gear 62 is rotatably installed on the mounting plate 1, and the idler gear 62 is rotatably meshed with the gear 51 and the internal gear ring 61 respectively. With this design, when the sampling tube 2 rotates, through the transmission of the internal gear ring 61 and the idler gear 62, the screw conveyor 5 is driven to rotate synchronously, without the need to set another power source.

[0044] In one embodiment, the overall shape of the sampling tube 2 is a cone with a larger upper part and a smaller lower part, and the overall shape of the screw conveyor 5 is also a cone with a larger upper part and a smaller lower part;

[0045] A lifting device 7 is further arranged on the mounting plate 1, which is used to move the whole screw conveyor 5 up and down inside the sampling tube 2.

[0046] In specific implementation, on the one hand, the conical sampling tube 2 is easier to insert into the coal pile. On the other hand, since the coal stacked in the truck is not tightly packed, by designing the sampling tube 2 in a conical shape, when the sampling tube 2 moves downward, the spiral blades 21 on the sampling tube 2 can more easily receive force, so that when the sampling tube 2 rotates, the downward force generated is greater and it is easier to extend to a sufficient depth. By making the auger 5 also in a conical shape with a larger upper part and a smaller lower part and capable of moving up and down in the sampling tube 2 under the drive of the lifting device 7, when the auger 5 is stuck, the auger 5 can be moved upward to increase the gap between the auger 5 and the inner wall of the sampling tube 2, thus solving the problem of the auger 5 being stuck, achieving multiple benefits at once.

[0047] In one embodiment, the mounting plate 1 includes two plate bodies arranged at intervals up and down, and the two plate bodies up and down are connected together by connecting columns. The lifting device 7 includes a lifting plate 71 located between the two plate bodies up and down. The end of the auger 5 is rotatably mounted on the lifting plate 71. A telescopic unit 72 is arranged at the bottom of the mounting plate 1, and the telescopic end of the telescopic unit 72 passes through one of the plate bodies and is connected to the lifting plate 71 to drive the lifting plate 71 to move up and down.

[0048] In specific implementation, the telescopic unit 72 can be an electric telescopic rod or a pneumatic telescopic rod or a hydraulic telescopic rod in the prior art. Arranging the telescopic unit 72 at the bottom of the mounting plate 1 can make the structure more compact. At the same time, among the two plate bodies up and down, the upper plate body is used to connect with the sampling robotic arm.

[0049] In one embodiment, since the increase in the number of sampling tubes 2 will affect the efficiency of coal sample discharge, in order to further improve the working efficiency, the following technical solutions are provided:

[0050] On one side of the top of each sampling tube 2, a discharge port 23 for discharging coal samples is respectively opened. At the position corresponding to the discharge port 23 on the outside of the sampling tube 2, a rotating ring 24 is rotatably arranged. An opening for communicating with the discharge port 23 is opened on the rotating ring 24. An inclined downward discharge channel 25 is communicated at the opening. The output ends of each channel are commonly communicated with a temporary storage bin 26, and the bottom of the temporary storage bin 26 can be automatically opened and closed.

[0051] In specific implementation, the discharge port 23 is located at the top of the blades of the auger 5. The auger 5 conveys the coal samples from bottom to top to the discharge port 23 and accumulates at the discharge port 23. When the discharge port 23 is communicated with the opening on the rotating ring 24, the coal samples are output from the discharge port 23 to the discharge channel 25 and finally conveyed into the temporary storage bin 26 through the discharge channel 25. After sampling is completed, the auger 5 is flipped to discharge the excess coal samples in place. After the sampling tube is pulled out, the temporary storage bin 26 is moved to the inlet of the coal sample transmission device, and then the bottom of the temporary storage bin 26 is opened to discharge the coal samples.

[0052] It should be pointed out that the structure of the automatic opening and closing of the bottom of the temporary storage bin 26 is a common structure and is common knowledge to those skilled in the art. For example, a discharge port can be opened at the bottom of the temporary storage bin 26, and a baffle can be slidably set at the discharge port. This can be achieved by driving the baffle to slide by an electric telescopic rod, a pneumatic telescopic rod, or a hydraulic telescopic rod.

[0053] Preferably, several connecting rods may be added between the mounting plate 1 and the temporary storage bin 26 to enhance the supporting strength of the temporary storage bin 26 .

[0054] In one embodiment, the auger 5 rotates in the opposite direction to the spiral blade 21 on the sampling tube 2, and the auger 5 rotates in the opposite direction to the sampling tube 2. This design can accelerate the movement of the coal sample in the sampling tube 2 and accelerate the discharge of the coal sample.

[0055] In one embodiment, the sealing assembly 4 includes a sealing plate 41 for sealing the sampling port 22. The sealing plate 41 is slidably disposed in the sampling tube 2. A rotating block 42 is rotatably disposed at the bottom of the inner side of the sampling tube 2. The bottom of the sealing plate 41 is connected to the rotating block 42 and rotates together with the rotating block 42.

[0056] A through hole is provided in the middle of the rotating block 42, and a guide rod 43 fixedly connected to the sampling tube 2 is vertically provided in the through hole. A spiral guide groove (not shown in the figure) is provided on the guide rod 43, and a sleeve 44 is sleeved on the outer side of the guide rod 43. A guide block (not shown in the figure) that slides with the spiral guide groove is provided on the sleeve 44. A spring 45 is also provided between the sleeve 44 and the guide rod 43. The spring 45 is used to push the sleeve 44 to move away from the guide rod 43. The sleeve 44 can only move up and down relative to the rotating block 42 and can drive the rotating block 42 to rotate. A rotating plate 46 is rotatably provided on the side of the sleeve 44 away from the guide rod 43, and the rotating plate 46 is used to abut against the bottom of the auger 5;

[0057] When the auger 5 is in working state, the bottom of the auger 5 contacts the rotating plate 46 and pushes the sleeve 44 to move downward, causing the sleeve 44 to rotate. The rotating sleeve 44 drives the rotating block 42 to rotate, causing the sealing plate 41 to move, thereby releasing the blocking of the sampling port 22 .

[0058] In specific implementation, when the sampling tube 2 has not reached the specified depth, the lifting device 7 drives the auger 5 to move upward. At this time, the auger 5 does not rotate. After the sampling tube 2 reaches the specified depth, the lifting device 7 drives the auger 5 to move downward. The gear 51 on the auger 5 meshes with the idle gear 62, and the auger 5 starts to rotate. At the same time, the bottom of the auger 5 contacts the rotating plate 46 and pushes the sleeve 44 downward, causing the sleeve 44 to rotate. The rotating sleeve 44 drives the rotating block 42 to rotate, causing the sealing plate 41 to displace and release the blocking of the sampling port 22. After sampling is completed, the lifting device 7 drives the auger 5 to move upward. Then, under the push of the spring 45, the sleeve 44 drives the rotating block 42 to rotate, causing the sealing plate 41 to displace and re-block the sampling port 22.

[0059] It should be noted that there are many specific structures for the "sleeve 44 that can only move up and down relative to the rotating block 42 and can drive the rotating block 42 to rotate". For example, the sleeve 44 can be designed as a polygonal structure; or a vertical guide groove can be opened on the rotating block 42, and a vertical guide block can be provided on the sleeve 44 to achieve the same effect.

[0060] Preferably, a circular guide rail is provided at the top of the sampling tube 2 corresponding to the sealing plate 41. A limiting rod extending into the circular guide rail is provided at the top of the sealing plate 41. The limiting rod can slide relative to the circular guide rail to limit the movement track of the sealing plate 41. A spring 45 can be provided in the circular guide rail to assist in pushing the sealing plate 41 to reset.

[0061] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0062] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0063] In addition, "a plurality" means more than two.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-channel coal sampling device, characterized in that: The invention comprises a mounting plate (1) and a plurality of sampling tubes (2) rotatably mounted on the mounting plate (1), wherein the outer sides of the sampling tubes (2) are provided with spiral blades (21), and a power assembly (3) for driving the sampling tubes (2) to rotate is provided on the mounting plate (1), wherein the sampling tubes (2) extend into the coal pile in a spiral ascending and descending manner; The bottom of each sampling tube (2) is pointed, and both sides of the pointed end are provided with sampling ports (22) for coal samples to enter, and a blocking assembly (4) capable of opening and closing the sampling ports (22) is provided.

2. The multi-channel coal sampling device according to claim 1, characterized in that: An auger (5) is arranged inside the sampling tube (2). The top of the auger (5) is rotatably arranged on the mounting plate (1). The bottom end of the auger (5) extends to the sampling port (22). The auger (5) also includes a transmission component (6) for driving the auger (5) to rotate, thereby driving the coal sample inside the sampling tube (2) to rise and fall.

3. The multi-channel coal sampling device according to claim 2, characterized in that: A discharge port (23) for discharging coal samples is provided on one side of the top of each sampling tube (2). A rotating ring (24) is rotatably provided at the position of the discharge port (23) on the outer side of the sampling tube (2). An opening for communicating with the discharge port (23) is provided on the rotating ring (24). A sample discharge channel (25) is connected obliquely downward at the opening. The output ends of each channel are commonly connected to a temporary storage bin (26). The bottom of the temporary storage bin (26) can be automatically opened and closed.

4. The multi-channel coal sampling device according to claim 3, characterized in that: The spiral blades (21) on the auger (5) and the sampling tube (2) rotate in opposite directions, and the rotation directions of the auger (5) and the sampling tube (2) are also opposite.

5. The multi-channel coal sampling device according to claim 2, characterized in that: The transmission assembly (6) comprises an inner gear ring (61) arranged at the top end of the sampling tube (2); a gear (51) is arranged at the top of the auger (5) at a position corresponding to the inner gear ring (61); an idler wheel (62) is meshed between the gear (51) and the inner gear ring (61); and the idler wheel (62) is rotatably meshed with the gear (51) and the inner gear ring (61), respectively.

6. The multi-channel coal sampling device according to claim 2, characterized in that: The sampling tube (2) is in the shape of a cone with a larger top and a smaller bottom as a whole, and the auger (5) is also in the shape of a cone with a larger top and a smaller bottom as a whole; The mounting plate (1) is also provided with a lifting device (7) for enabling the auger (5) to move up and down as a whole in the sampling tube (2).

7. The multi-channel coal sampling device according to claim 6, characterized in that: The mounting plate (1) comprises two upper and lower plate bodies spaced apart from each other, the upper and lower plate bodies being connected together via a connecting column, the lifting device (7) comprises a lifting plate (71) located between the upper and lower plate bodies, the end of the auger (5) being rotatably mounted on the lifting plate (71), a telescopic unit (72) being arranged at the bottom of the mounting plate (1), the telescopic end of the telescopic unit (72) passing through one of the plate bodies and connected to the lifting plate (71), driving the lifting plate (71) to move up and down.

8. The multi-channel coal sampling device according to claim 6, characterized in that: The blocking assembly (4) comprises a sealing plate (41) for blocking the sampling port (22); the sealing plate (41) is slidably arranged in the sampling tube (2); a rotating block (42) is rotatably arranged at the bottom of the inner side of the sampling tube (2); the bottom of the sealing plate (41) is connected to the rotating block (42) and rotates together with the rotating block (42); A through hole is provided in the middle of the rotating block (42), a guide rod (43) fixedly connected to the sampling tube (2) is vertically provided in the through hole, a spiral guide groove is provided on the guide rod (43), a sleeve (44) is sleeved on the outer side of the guide rod (43), a guide block slidably matched with the spiral guide groove is provided on the sleeve (44), a spring (45) is further provided between the sleeve (44) and the guide rod (43), the spring (45) is used to push the sleeve (44) to move in a direction away from the guide rod (43), the sleeve (44) can only move up and down relative to the rotating block (42) and can drive the rotating block (42) to rotate, a rotating plate (46) is rotatably provided on the side of the sleeve (44) away from the guide rod (43), and the rotating plate (46) is used to abut against the bottom of the auger (5); When the auger (5) is in working state, the bottom of the auger (5) contacts the rotating plate (46) and pushes the sleeve (44) to move downward, causing the sleeve (44) to rotate. The rotating sleeve (44) drives the rotating block (42) to rotate, causing the sealing plate (41) to move, thereby releasing the blocking of the sampling port (22).

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