Automatic sampling device

Abstract

The utility model discloses an automatic sampling device which is characterized in that the wall of a stock bin is fixedly connected with one end of a sampling barrel, the other end of the sampling barrel is fixedly connected with a sliding sleeve, a sampler is arranged in the sampling barrel, the sampler is connected with a support through a bearing seat, and the support is fixedly connected with a moving trolley; the bottom of the sampling barrel is fixedly connected with a sample storage hopper, the bottom of the sample storage hopper is connected with a discharging three-way valve through a rotary discharging device, and the discharging three-way valve is connected with the sampling barrel through a third pneumatic gate valve. The stock bin is fixedly connected with the sampling barrel, so that the stock bin is kept closed during sampling, dust pollution is avoided, meanwhile, the PLC control system is used for controlling the motor and the pneumatic gate valve, automatic sampling is achieved, automatic shutdown is achieved after the sampling weight reaches a preset value, and accuracy is high; and redundant materials can be purged and returned to the bin, so that repeated sampling and material waste are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of biomaaterial production, and particularly relates to an automatic sampling device Background Art

[0002] In the production field of biomaaterials such as polyhydroxyalkanoates (PHA for short), it is necessary to sample raw materials, finished products and other materials regularly to detect whether the composition, particle size and other indicators of the materials meet the standards. However, the production process of biomaaterials has high cleanliness requirements. Once positive pressure or material collapse occurs in the silo or hopper due to technological reasons, the traditional sampling port will emit dust and cause dust pollution, which is not conducive to the safety and occupational health of operators. In addition, due to the requirements for the sampling weight during sampling, if the amount of a single sampling is insufficient, multiple samplings are required in the silo. If the amount of a single sampling is excessive, it is easy to cause waste of materials and low efficiency

[0003] CN109827800A discloses an automatic sampling device and an automatic sampling method, which includes a sampling gun, a sampling mechanism and a motion mechanism. The sampling gun includes a sampling bin; the motion mechanism is detachably connected to the sampling mechanism and is used to drive the sampling mechanism to travel along a preset path; the sampling mechanism is detachably connected to the sampling gun and is used to drive the sampling gun to move in a direction close to the sampling object under the drive of the motion mechanism, open the sampling bin and perform a sampling operation when the sampling gun is inserted into the sampling object to a preset depth, and close the sampling bin after the sampling operation is completed, realizing automatic sampling

[0004] CN110736647A discloses an automatic quantitative sampling device and a sampling method, which includes an XYZ three-axis motion platform, a precision balance, a sample bottle and a sampling pump body frame; before quantitative sampling, multiple sampling screw pumps are placed in the sampling pump body frame, the sample bottle is placed at the sampling station, and the test tube is placed on the precision balance; during sampling, the sampling gripper takes a sampling screw pump from the sampling pump body frame, moves to the sampling station, the Z-axis mechanism drives the sampling gripper and the sampling screw pump to take a certain amount of sample from the sample bottle, and then moves to the sample releasing position at the precision balance to release the sample into the test tube, and the precision balance can weigh the weight of the sample in the test tube, thus completing the process of automatic quantitative sampling and improving the sampling accuracy and sampling efficiency of the sample

[0005] However, at present, all automatic sampling devices need to open the sample bin for sampling, which is easy to cause dust pollution. And in order to sample accurately, multiple samplings and weighings are required. Since the taken samples have been exposed to the external environment, they cannot be returned to the sample bin for reuse, and the problem of material waste during sampling cannot be overcome Summary of the Utility Model

[0006] In view of the above technical problems, the utility model provides an automatic sampling device, which fixedly connects the silo with the sampling cylinder to keep the silo sealed during sampling, avoiding dust pollution. At the same time, the PLC control system is used to control the motor and the pneumatic gate valve to realize automatic sampling. When the sampling weight reaches the preset value, the device will automatically stop, with high precision. The excess materials can be purged back into the silo, avoiding repeated sampling and waste of materials.

[0007] To achieve the above object, the utility model provides an automatic sampling device. The sampling cylinder is fixedly connected to the wall of the silo. One end of the sampling cylinder is provided with a first pneumatic gate valve, and the other end is fixedly connected to a sliding sleeve. A sampler is arranged inside the sampling cylinder. The sampler is connected to a support through a bearing seat, and the support is fixedly connected to a moving trolley. The bottom of the sampling cylinder is fixedly connected to a sample storage hopper. The bottom of the sample storage hopper is connected to a rotary feeder and then to a three-way valve. The three-way valve is connected to a sampling bucket through a third pneumatic gate valve.

[0008] Preferably, the sampler is composed of a sampling spoon and a sliding rod, and the sampling spoon is fixedly connected to the sliding rod.

[0009] More preferably, the sliding rod passes through the sliding sleeve and is connected to a large sprocket. The end of the large sprocket is fixed on the support through a bearing seat.

[0010] Preferably, a copper sleeve is arranged inside the sliding sleeve, a grease nipple is arranged at the top, an oil spill port is arranged at the bottom, and a dust-proof sealing ring is arranged at the position where the sliding sleeve is connected to the sampling cylinder.

[0011] Preferably, the support is fixedly connected to a displacement control bracket. A first metal induction sheet and a third metal induction sheet are arranged at the top of the displacement control bracket. The third metal induction sheet is connected to a rigid pipe through a second proximity switch, and the rigid pipe is fixedly connected to the silo.

[0012] More preferably, a first proximity switch is arranged at the lower part of the displacement control bracket. The first proximity switch is connected to the large sprocket through a second metal induction sheet.

[0013] Preferably, rollers are arranged at the bottom of the moving trolley, and a motor and a control system are arranged at the top.

[0014] More preferably, the motor is connected to a small sprocket through a coupling, and the small sprocket is connected to the large sprocket.

[0015] Preferably, a cylinder is arranged on one side of the sample storage hopper, and the cylinder is connected to the moving trolley.

[0016] Preferably, the three-way valve includes two channels. A third pneumatic gate valve is arranged on one channel and is connected to the sampling bucket. The sampling cylinder is located on an electronic scale. A second pneumatic gate valve is arranged on the other channel of the three-way valve and is connected to a small silo. The bottom of the small silo is connected to the silo through a Roots blower and a return pipe.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. The silo is fixedly connected to the sampling cylinder. The sampling spoon and the sliding rod for sampling pass through the sampling cylinder and enter the silo. The tail of the sampling cylinder is sealed through structures such as a sliding sleeve, a copper sleeve, and a dust-proof sealing ring, avoiding dust emission at the sampling port due to positive pressure or material collapse, preventing dust pollution, and reducing potential safety hazards. In addition, when sampling is not in progress, the first pneumatic gate valve is used to seal the sampling cylinder to prevent the material in the silo from entering the sampling cylinder.

[0019] 2. The sliding rod connected to the sampling spoon is connected to the mobile trolley through a support. At the same time, the mobile trolley is also connected to the sample storage hopper through a cylinder. The forward and backward movement of the mobile trolley and all devices on the mobile trolley is driven by the telescopic movement of the piston rod in the cylinder, thereby controlling the forward and backward movement of the sliding rod to make the sampling spoon enter the silo for sampling or withdraw from the silo to unload the material.

[0020] 3. A large sprocket is installed at the rear of the sliding rod. The large sprocket interacts with the small sprocket. The motor and coupling on the mobile trolley drive the small sprocket, thereby driving the large sprocket to control the free rotation of the sliding rod, and thus realizing the free rotation of the sampling spoon in the silo and the sampling cylinder to complete sampling and unloading.

[0021] 4. The taken-out material controls the sampling rate through a rotary feeder. At the same time, after the taken-out material is weighed by an electronic scale, when the preset weight is reached, the remaining material is conveyed to the small silo through a pneumatic gate valve, and then conveyed back to the silo through a Roots blower and a return pipe, avoiding waste of materials and improving the accuracy of sampling.

[0022] 5. The PLC control system is used to control components such as the start gate valve, the large sprocket, and the small sprocket, realizing automatic sampling, material weighing, and return of the remaining material, improving the sampling efficiency, solving the dust pollution and occupational health hazards easily caused by manual sampling, and reducing the dependence on labor. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the present utility model.

[0024] Figure 2 It is a schematic structural diagram of the sampler.

[0025] Figure 3 It is a schematic structural diagram of the sliding sleeve.

[0026] In the figure, 1 is a silo, 2 is a first pneumatic gate valve, 3 is a sampling cylinder, 4 is a sample storage hopper, 5 is a rigid pipe, 6 is a first metal induction sheet, 7 is a first proximity switch, 8 is a second metal induction sheet, 9 is a second proximity switch, 10 is a third metal induction sheet, 11 is a displacement control bracket, 12 is a bearing seat, 13 is a reduction motor, 14 is a control system, 15 is a sampling spoon, 16 is a sliding rod, 17 is a Roots blower, 18 is a small silo, 19 is a second pneumatic gate valve, 20 is a blanking three-way valve, 21 is a rotary blanking device, 22 is a third pneumatic gate valve, 23 is a sampling bucket, 24 is a sliding sleeve, 25 is an electronic scale, 26 is a cylinder, 27 is a small sprocket, 28 is a large sprocket, 29 is a coupling, 30 is a support, 31 is a moving trolley, 32 is a roller, 33 is a return pipe, 34 is a copper sleeve, 35 is a grease nipple, 36 is a waste oil overflow port, 37 is a dust-proof sealing ring. Detailed implementation mode

[0027] The technical solution of the present invention will be further explained below in conjunction with the drawings and specific embodiments. It should be noted that the following embodiments are only the preferred embodiments of the present invention and should not be construed as a limitation of the present invention. The protection scope of the present invention shall be subject to the content recorded in the claims. Any modifications and substitutions made by those skilled in the art to the technical solution of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment 1

[0029] An automatic sampling device, a sampling cylinder 3 is welded to the opening on the wall of the silo 1. One end of the sampling cylinder 3 is provided with a first pneumatic gate valve 2, and a sliding sleeve 24 is welded to the opening at the other end; a sampler is arranged inside the sampling cylinder 3. The sampler is connected to the support 30 through the bearing seat 12. The support 30 is integrally welded on the moving trolley 31. The forward and backward movement of the sampler is controlled by the forward and backward movement of the moving trolley 31 to realize sampling and discharging; the bottom of the sampling cylinder 3 is fixedly connected to the sample storage hopper 4. The bottom of the sample storage hopper 4 is connected to the blanking three-way valve 20 through the rotary blanking device 21. The blanking three-way valve 20 is connected to the sampling bucket 23 through the third pneumatic gate valve 22, and the material taken out by the sampler is discharged in a controlled manner so that the material enters the sampling cylinder 23.

[0030] Preferably, the sampler is composed of a sampling spoon 15 and a sliding rod 16. The sampling spoon 15 is fixedly connected to the sliding rod 16. The sliding rod 16 and the sampling spoon 15 can freely move forward and backward and rotate in the sampling cylinder 3 and the silo 1.

[0031] Further preferably, the sliding rod 16 passes through the sliding sleeve 24 and is connected to the large sprocket 28. The end of the large sprocket 28 is fixed to the support 30 through the bearing seat 12. The rotation of the sliding rod 16 is controlled by the large sprocket 28. At the same time, the sliding rod 16 is fixed in a horizontal position by the bearing seat 12 and the support 30 to facilitate sampling.

[0032] Preferably, a copper sleeve 34 is provided inside the sliding sleeve 24, a grease nipple 35 is provided at the top, a waste oil overflow port 36 is provided at the bottom, and a dust-proof sealing ring 37 is provided at the position where the sliding sleeve 24 is connected to the sampling cylinder 3 to prevent material dust from entering between the sliding rod 16 and the sliding sleeve 24 during sampling. At the same time, grease is replenished between the copper sleeve 34 and the sliding rod 16 through the grease nipple 35 for lubrication, and the excess grease is discharged through the waste oil overflow port 36.

[0033] Preferably, the support 30 is fixedly connected to the displacement control bracket 11. A first metal induction sheet 6 and a third metal induction sheet 10 are provided at the top of the displacement control bracket 11. The third metal induction sheet 10 is connected to the rigid pipe 5 through the second proximity switch 9, and the rigid pipe 5 is fixedly connected to the silo 1. The second proximity switch 9, the first metal induction sheet 6 and the third metal induction sheet 10 are used to control the limit when the sliding rod 16 moves, so as to prevent the sampling spoon 15 from advancing too much and damaging the inner wall of the silo 1 or retreating too much and damaging the sampling cylinder 3.

[0034] More preferably, a first proximity switch 7 is provided at the lower part of the displacement control bracket 11. The first proximity switch 7 is connected to the large sprocket 28 through the second metal induction sheet 8, and the first proximity switch 7 and the second metal induction sheet 8 are used to control the direction of the sampling spoon 15 during sampling.

[0035] Preferably, rollers 32 are provided at the bottom of the moving trolley 31, so that the moving trolley can move freely back and forth, thereby driving the related components to move back and forth. A motor 13 and a control system 14 are provided at the top. The control system 14 is a PLC control system, which can drive the movement of multiple pneumatic gate valves to realize automatic sampling.

[0036] More preferably, the motor 13 is connected to the small sprocket 27 through a coupling 29. The small sprocket 27 and the large sprocket 28 interact to control the automatic rotation of the sliding rod 16, so that the sampling spoon 15 can be changed between the sampling position and the discharging position.

[0037] Preferably, a cylinder 26 is provided on one side of the sample storage hopper 4. The cylinder 26 is connected to the moving trolley 31. The telescopic movement of the piston rod in the cylinder 26 drives the moving trolley and all the devices on the trolley to move forward and backward, so as to realize the functions of the sampler entering the silo for sampling and retreating from the silo for discharging.

[0038] Preferably, the blanking three-way valve 20 includes two channels. A third pneumatic gate valve 22 is provided on one channel and is connected to the sampling bucket 23. The sampling cylinder 23 is located on the electronic scale 25 and is used to accurately weigh the taken-out materials. A second pneumatic gate valve 19 is provided on the other channel of the blanking three-way valve 20 and is connected to the small bin 18. The bottom of the small bin 18 is connected to the bin 1 through the roots blower 17 and the return pipe 33. The excess materials are temporarily stored in the small bin 18 and finally blown back into the bin 1 through the roots blower 17 for recycling.

[0039] Embodiment 2

[0040] During sampling, the motor 13 is started, the small sprocket 27 drives the large sprocket 28 to rotate, the first proximity switch 7 senses and gets powered, and the motor 13 stops. At this time, the sampling spoon 15 is at the sampling position.

[0041] The control system 14 drives the first pneumatic gate valve 2 to open. The piston rod in the cylinder 26 contracts, pulling the moving trolley 31 to drive the sliding rod 16 and the sampling spoon 15 to move into the bin 1 together through the sampling cylinder 3 and the sliding sleeve 24. The second proximity switch 9 senses and gets powered, and the cylinder 26 stops operating. At this time, the sampling spoon 15 enters the bin 1 to complete sampling.

[0042] During discharging, the control system 14 drives the piston rod in the cylinder 26 to extend, driving the moving trolley 31 to move backward, driving the sampling spoon 15 and the sliding rod 16 to retreat and enter the sampling cylinder 3. When the second proximity switch 9 senses and gets powered, the cylinder 26 stops operating. At the same time, the first pneumatic gate valve 2 closes to prevent material leakage. The motor 13 is started, the small sprocket 27 drives the large sprocket 28 to rotate to make the sampling spoon 15 rotate to the discharging position, and the materials in the sampling spoon 15 are discharged into the sample storage hopper 4. The materials in the sample storage hopper 4 enter the sampling bucket 23 through the opened rotary blanking device 21 and the third pneumatic gate valve 22 and are weighed by the electronic scale 25. At this time, the second pneumatic gate valve 19 is in the closed state. When the materials in the sampling bucket 23 reach the preset weight value, the third pneumatic gate valve 22 closes to complete sampling.

[0043] After sampling is completed, the second pneumatic gate valve 19 is opened, and the remaining materials in the sample storage hopper 4 all enter the small bin 18. Then the rotary blanking device 21 and the second pneumatic gate valve 19 are closed, and the roots blower 17 is started to blow the remaining materials back into the bin 1 through the return pipe 33.

Claims

1. An automatic sampling device, characterized in that: The bin wall of the silo (1) is fixedly connected to the sampling cylinder (3). One end of the sampling cylinder (3) is provided with a first pneumatic gate valve (2), and the other end is fixedly connected to the sliding sleeve (24). A sampler is arranged inside the sampling cylinder (3). The sampler is connected to the support (30) through the bearing seat (12), and the support (30) is fixedly connected to the moving trolley (31); the bottom of the sampling cylinder (3) is fixedly connected to the sample storage hopper (4). The bottom of the sample storage hopper (4) is connected to the three-way valve (20) through the rotary feeder (21), and the three-way valve (20) is connected to the sampling bucket (23) through the third pneumatic gate valve (22).

2. The automatic sampling device according to claim 1, characterized in that: The sampler consists of a sampling spoon (15) and a sliding rod (16), and the sampling spoon (15) is fixedly connected to the sliding rod (16).

3. The automatic sampling device according to claim 2, characterized in that: The sliding rod (16) passes through the sliding sleeve (24) and is connected to the large sprocket (28), and the end of the large sprocket (28) is fixed on the support (30) through the bearing seat (12).

4. An automatic sampling device according to claim 1, characterized in that: A copper sleeve (34) is arranged inside the sliding sleeve (24), a grease nipple (35) is arranged at the top, and a waste oil overflow port (36) is arranged at the bottom. A dust-proof sealing ring (37) is arranged at the connection position between the sliding sleeve (24) and the sampling cylinder (3).

5. An automatic sampling device according to any one of claims 1 or 3, characterized in that: The support (30) is fixedly connected to the displacement control bracket (11). A first metal induction sheet (6) and a third metal induction sheet (10) are arranged at the top of the displacement control bracket (11). The third metal induction sheet (10) is connected to the rigid pipe (5) through the second proximity switch (9), and the rigid pipe (5) is fixedly connected to the silo (1).

6. The automatic sampling device according to claim 5, characterized in that: A first proximity switch (7) is arranged at the lower part of the displacement control bracket (11), and the first proximity switch (7) is connected to the large sprocket (28) through the second metal induction sheet (8).

7. An automatic sampling device according to claim 1, characterized in that: Rollers (32) are arranged at the bottom of the moving trolley (31), and a motor (13) and a control system (14) are arranged at the top.

8. An automatic sampling device according to claim 7, characterized in that: The motor (13) is connected to the small sprocket (27) through a coupling (29), and the small sprocket (27) is connected to the large sprocket (28).

9. The automatic sampling device according to claim 1, wherein: A cylinder (26) is arranged on one side of the sample storage hopper (4), and the cylinder (26) is connected to the moving trolley (31).

10. The automatic sampling device according to claim 1, characterized in that: The three-way valve (20) includes two channels. A third pneumatic gate valve (22) is arranged on one channel and is connected to the sampling bucket (23), and the sampling bucket (23) is located on the electronic scale (25); a second pneumatic gate valve (19) is arranged on the other channel of the three-way valve (20) and is connected to the small silo (18). The bottom of the small silo (18) is connected to the silo (1) through the roots blower (17) and the return pipe (33).

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