Automatic closed sampling device for caustic soda flakes

Abstract

The invention relates to the technical field of pipeline sampling, in particular to an automatic closed caustic soda flake sampler which comprises a sampling pipe, one end of the sampling pipe is used for being fixed to the side wall of a caustic soda flake hopper, the other end of the sampling pipe is fixedly provided with a closed bottom plate, and a sampling rod is arranged in the sampling pipe. One end of the sampling rod slidably penetrates through and extends out of the closed bottom plate and then is coaxially connected with the output end of the first air cylinder; a sampling groove is formed in the side wall of one end, away from the first cylinder, of the sampling rod; the first cylinder is in transmission connection with an output shaft of the servo motor; a sampling opening is formed in the side face of the bottom of the sampling pipe, a sampling cavity is connected to the sampling opening, the bottom of the sampling cavity is detachably communicated with a sampling bottle, and the side wall of the sampling cavity is communicated with a negative pressure suction mechanism; a scraping mechanism is arranged at one end of the sampling pipe connected with the caustic soda flake hopper. The residual caustic soda flakes can be prevented from influencing the sampling representativeness; the problem of personnel injury caused by moisture absorption and unsafe factors in the manual sampling process of the caustic soda flakes is solved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline sampling, in particular to an automatic closed sampler for caustic soda flakes. Background Art

[0002] At present, the production of caustic soda flakes is a continuous production with high temperature and strong corrosiveness. The quality inspection and analysis of powder materials generally adopts manual sampling at the on-site discharge port or packaging bag at regular intervals. During the sampling process, due to the manual sampling operation, the powder will stay in the air for a long time and will absorb moisture, agglomerate and absorb carbon dioxide in the air, resulting in unqualified main content of caustic soda flakes, unrepresentative sampling or caustic soda flakes absorbing moisture, which not only increases the unsafe factors during sampling but also is likely to cause the sample to lose its representativeness. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an automatic closed sampler for caustic soda flakes, so as to solve the problem of moisture absorption and unsafe factors causing injuries to personnel during the manual sampling process of caustic soda flakes.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: an automatic closed sampler for caustic soda flakes, comprising a sampling tube, one end of the sampling tube is used to be fixed on the side wall of the caustic soda flake hopper, and the other end is fixedly provided with a closed bottom plate, a sampling rod is provided in the sampling tube, one end of the sampling rod is slid through and extended from the closed bottom plate and then coaxially connected with the output end of the first cylinder, the first cylinder is used to drive the sampling rod to insert into the caustic soda flake hopper; a sampling groove is provided on the side wall of the sampling rod away from the end of the first cylinder, the first cylinder is drivingly connected to the output shaft of the servo motor and is used to rotate axially under the drive of the servo motor; a sampling port is provided on the bottom side of the sampling tube, a sampling cavity is connected at the sampling port, a sampling bottle is detachably connected to the bottom of the sampling cavity, and a negative pressure suction mechanism is connected to the side wall of the sampling cavity; a scraping mechanism for scraping the caustic soda flakes in the sampling groove is provided at the end of the sampling tube connected to the caustic soda flake hopper.

[0005] The beneficial effects of the present invention are as follows: before sampling, the present invention scrapes off the residual caustic soda in the sampling groove, and then sucks and recovers the residual caustic soda through a negative pressure suction mechanism, thereby preventing the residual caustic soda from affecting the representativeness of the sampling; the present invention performs automatic sampling in a completely closed state, thereby solving the problem of personal injury caused by moisture absorption and unsafe factors of caustic soda during manual sampling.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, a sampling valve is provided at the sampling port, one end of the sampling valve is connected to the sampling port, and the other end of the sampling valve is connected to the sampling cavity.

[0008] The beneficial effect of adopting the above further solution is that the setting of the sampling valve can seal and isolate the space in the sampling tube after the sampling is completed, thereby ensuring the sealing of the sampling tube and preventing the external environment from affecting the sampling.

[0009] Furthermore, a quick-release buckle is fixedly connected to the bottom opening of the sampling cavity, and the sampling bottle is detachably fixedly connected to the quick-release buckle.

[0010] The beneficial effect of adopting the above further solution is that the quick-release buckle can facilitate the disassembly and assembly of the sampling bottle.

[0011] Furthermore, a connecting hole for the sampling rod to pass through is provided on the side wall of the flake caustic soda hopper, and blocking mechanisms for blocking the connecting hole are provided on both ends of the sampling rod.

[0012] The beneficial effect of adopting the above-mentioned further scheme is that the sealing mechanism at both ends of the sampling rod can prevent the flake caustic soda in the caustic soda hopper from being sucked out when the negative pressure suction mechanism sucks out the residual flake caustic soda in the sampling tube. At the same time, after the sampling is completed, the sealing mechanism close to the flake caustic soda hopper can isolate the flake caustic soda hopper and the sampling tube to prevent the flake caustic soda in the flake caustic soda hopper from entering the sampling tube when no sampling is done.

[0013] Furthermore, the blocking mechanism comprises a blocking plate, two of the blocking plates are fixedly arranged on the sampling rod at an interval, and the sampling slot is arranged between the two blocking plates.

[0014] The beneficial effect of adopting the above further solution is that the blocking mechanism adopts a blocking plate, and the blocking plate is used to block the connecting hole, and the structure is simple.

[0015] Furthermore, the communicating hole is a circular hole, and at least two ends of the sampling rod are cylindrical structures with a diameter the same as the inner diameter of the communicating hole, and the cylindrical structure and the circular hole are slidably sealed to form the blocking mechanism.

[0016] The beneficial effect of adopting the above further solution is that: both ends of the sampling rod adopt a cylindrical structure with the same diameter as the inner diameter of the connecting hole, and the connecting hole is sealed by a sliding seal, and the sampling rod structure is simpler.

[0017] Furthermore, the scraper mechanism includes a second cylinder and a first scraper. The second cylinder is arranged vertically below one end of the sampling tube connected to the flake caustic soda hopper. The output end of the second cylinder is fixedly connected to the first scraper for driving the first scraper to extend into the sampling trough. The upper part of the first scraper matches the cross-sectional shape of the sampling trough.

[0018] The beneficial effect of adopting the above further scheme is: the first scraper is pushed by the second cylinder so that the upper part of the first scraper is inserted into the sampling groove, and the residual caustic soda on the inner wall of the sampling groove is scraped off when the sampling rod moves linearly, and then the second cylinder drives the first scraper to retract and exit the sampling groove without affecting the continued linear movement and rotation of the sampling rod.

[0019] Furthermore, the scraping mechanism comprises a flexible scraping brush, and the bottom end of the flexible scraping brush is fixed on the bottom inner wall of the sampling tube.

[0020] The beneficial effect of adopting the above further solution is that the scraping mechanism adopts a flexible scraping brush, which has a simple structure, and the flexible scraping brush will not affect the linear motion and rotation of the sampling rod.

[0021] Furthermore, the scraper mechanism includes a second scraper and an elastic telescopic part, the bottom of the elastic telescopic part is fixed on the bottom inner wall of the sampling tube, the top of the elastic telescopic part is fixedly connected to the second scraper, the upper part of the second scraper matches the cross-sectional shape of the sampling groove, and the two ends of the sampling groove are arc-shaped transitions.

[0022] The beneficial effect of adopting the above further scheme is: the scraping mechanism adopts a second scraper driven by an elastic telescopic member. Since the two ends of the sampling groove adopt an arc-shaped transition, when the sampling rod rotates to the sampling groove facing downward, the second scraper extends into the sampling groove under the action of the elastic telescopic member. When the sampling rod moves linearly and the second scraper moves to the two ends of the sampling groove, under the action of the arc-shaped transition, the second scraper separates from the sampling groove along the arc-shaped transition and presses against the outer wall of the sampling rod. Since the two ends of the sampling rod are cylindrical structures, the second scraper abutting against the two ends of the sampling rod will not affect the rotation of the sampling rod.

[0023] Furthermore, the negative pressure suction mechanism includes a negative pressure cavity and a negative pressure fan installed in the negative pressure cavity, one end of the negative pressure cavity is connected to the side wall of the sampling cavity, and the other end of the negative pressure cavity is connected to a recovery container.

[0024] The beneficial effect of adopting the above further solution is that the negative pressure suction mechanism adopts a negative pressure cavity provided with a negative pressure fan, and has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0028] Figure 4This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1. Sampling tube; 2. Caustic soda ash hopper; 3. Closed bottom plate; 4. Sampling rod; 5. First cylinder; 6. Sampling slot; 7. Servo motor; 8. Sampling port; 9. Sampling cavity; 10. Sampling bottle; 11. Sampling valve; 12. Quick release buckle; 13. Connecting hole; 14. Blocking plate; 15. Second cylinder; 16. First scraper; 17. Flexible scraper brush; 18. Second scraper; 19. Elastic telescopic part; 20. Negative pressure cavity; 21. Negative pressure fan. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] Embodiment 1

[0033] like Figure 1 As shown, this embodiment includes a sampling tube 1, one end of which is used to be fixed on the side wall of the caustic soda hopper 2, and the other end is fixedly provided with a closed bottom plate 3. A sampling rod 4 is provided in the sampling tube 1, and one end of the sampling rod 4 slides through and extends out of the closed bottom plate 3 and is coaxially connected to the output end of the first cylinder 5. The first cylinder 5 is used to drive the sampling rod 4 to insert into the caustic soda hopper 2; a sampling groove 6 is provided on the side wall of the end of the sampling rod 4 away from the first cylinder 5, and the first cylinder 5 is connected to the servo motor 5. The output shaft of the machine 7 is connected in transmission connection, and the servo motor 7 is fixed to the periphery of the flake caustic soda hopper 2 through a mounting bracket, and is used for axial rotation under the drive of the servo motor 7; a sampling port 8 is provided on the bottom side of the sampling tube 1, and a sampling cavity 9 is connected to the sampling port 8, and the bottom of the sampling cavity 9 is detachably connected to a sampling bottle 10, and the side wall of the sampling cavity 9 is connected to a negative pressure suction mechanism; a scraping mechanism for scraping the flake caustic soda in the sampling groove 6 is provided at one end of the sampling tube 1 connected to the flake caustic soda hopper 2.

[0034] In order to facilitate the flake caustic soda collected by the sampling groove 6 to fall into the sampling bottle 10, the sampling port 8 preferably adopts a funnel-shaped structure.

[0035] In this embodiment, a sampling valve 11 is provided at the sampling port 8, one end of the sampling valve 11 is connected to the sampling port 8, and the other end is connected to the sampling cavity 9. The setting of the sampling valve 11 can seal and isolate the space in the sampling tube 1 after the sampling is completed, thereby ensuring the sealing of the sampling tube 1 and preventing the external environment from affecting the sampling.

[0036] A quick-release buckle 12 is fixedly connected to the bottom opening of the sampling cavity 9 , and the sampling bottle 10 is detachably fixedly connected to the quick-release buckle 12 . The quick-release buckle 12 can facilitate the disassembly and assembly of the sampling bottle 10 .

[0037] In this embodiment, the negative pressure suction mechanism includes a negative pressure cavity 20 and a negative pressure fan 21 installed in the negative pressure cavity 20. One end of the negative pressure cavity 20 is connected to the side wall of the sampling cavity 9, and the other end of the negative pressure cavity 20 is connected to the recovery container. The negative pressure suction mechanism adopts a negative pressure cavity 20 equipped with a negative pressure fan 21, and has a simple structure.

[0038] In this embodiment, a connecting hole 13 for the sampling rod 4 to pass through is provided on the side wall of the caustic soda hopper 2, and a blocking mechanism for blocking the connecting hole 13 is provided on both ends of the sampling rod 4. The blocking mechanisms at both ends of the sampling rod 4 can prevent the caustic soda in the caustic soda hopper 2 from being sucked out when the negative pressure suction mechanism sucks out the residual caustic soda in the sampling tube 1. At the same time, after the sampling is completed, the blocking mechanism close to the caustic soda hopper 2 can isolate the caustic soda hopper 2 and the sampling tube 1 to prevent the caustic soda in the caustic soda hopper 2 from entering the sampling tube 1 when no sampling is performed. Specifically, the connecting hole 13 is a circular hole, and at least both ends of the sampling rod 4 are cylindrical structures with a diameter the same as the inner diameter of the connecting hole 13, and the cylindrical structure and the circular hole are slidably sealed to form the blocking mechanism, and the two ends of the sampling rod 4 adopt cylindrical structures with a diameter the same as the inner diameter of the connecting hole 13, and the connecting hole 13 is blocked by a sliding seal, and the structure of the sampling rod 4 is simpler.

[0039] In this embodiment, the scraping mechanism includes a second cylinder 15 and a first scraper 16. The second cylinder 15 is arranged vertically below one end of the sampling tube 1 connected to the flake caustic soda hopper 2. The output end of the second cylinder 15 is fixedly connected with the first scraper 16 for driving the first scraper 16 to extend into the sampling groove 6. The first scraper 16 is slidingly and sealingly connected to the side wall of the sampling tube 1. The upper part of the first scraper 16 matches the cross-sectional shape of the sampling groove 6. The first scraper 16 is pushed by the second cylinder 15 so that the upper part of the first scraper 16 is inserted into the sampling groove 6. When the sampling rod 4 moves linearly, the flake caustic soda remaining on the inner wall of the sampling groove 6 is scraped off, and then the second cylinder 15 drives the first scraper 16 to retract and exit the sampling groove 6 without affecting the continued linear motion and rotation of the sampling rod 4.

[0040] Working principle: The present invention is a timed sampling method, and the sampling cycle is customized according to the number of bags discharged by the packaging machine PLC. After the sampler of the present invention receives the sampling signal, before the sampling rod 4 is inserted into the caustic soda ash hopper 2, the second cylinder 15 inserts the first scraper 16 into the sampling slot 6, and the first cylinder 5 starts to insert the sampling rod 4 into the caustic soda ash hopper 2. In the process of the sampling rod 4 entering the caustic soda ash hopper 2, the first scraper 16 scrapes off the residual caustic soda ash in the sampling slot 6, and then the second cylinder 15 retracts the first scraper 16. The cylindrical mechanism at one end of the sampling rod 4 close to the first cylinder 5 seals the connecting hole 13, opens the sampling valve 11, and starts the negative pressure fan 21 to remove the residual caustic soda ash in the sampling tube 1 and the residual caustic soda ash in the sampling bottle 10. The residual flake caustic soda is extracted and recovered into the recovery container; the sampling valve 11 is closed, and the servo motor 7 drives the first cylinder 5 and the sampling rod 4 to rotate 180 degrees, so that the sampling slot 6 extending into the flake caustic soda hopper 2 is set upward. After standing for a period of time, the first cylinder 5 retracts the sampling rod 4, so that the cylindrical mechanism at one end of the sampling rod 4 away from the first cylinder 5 seals the connecting hole 13, and the sampling valve 11 is opened. The servo motor 7 drives the first cylinder 5 and the sampling rod 4 to rotate 180 degrees, so that the opening of the sampling slot 6 is set downward, and the flake caustic soda in it is poured into the sampling bottle 10 to complete the sampling.

[0041] Embodiment 2

[0042] like Figure 2 As shown, this embodiment includes a sampling tube 1, one end of which is used to be fixed on the side wall of the caustic soda hopper 2, and the other end is fixedly provided with a closed bottom plate 3. A sampling rod 4 is provided in the sampling tube 1, and one end of the sampling rod 4 slides through and extends out of the closed bottom plate 3 and is coaxially connected to the output end of the first cylinder 5. The first cylinder 5 is used to drive the sampling rod 4 to insert into the caustic soda hopper 2; a sampling groove 6 is provided on the side wall of the end of the sampling rod 4 away from the first cylinder 5, and the first cylinder 5 is connected to the servo motor 5. The output shaft of the machine 7 is connected in transmission connection, and the servo motor 7 is fixed to the periphery of the flake caustic soda hopper 2 through a mounting bracket, and is used for axial rotation under the drive of the servo motor 7; a sampling port 8 is provided on the bottom side of the sampling tube 1, and a sampling cavity 9 is connected to the sampling port 8, and the bottom of the sampling cavity 9 is detachably connected to a sampling bottle 10, and the side wall of the sampling cavity 9 is connected to a negative pressure suction mechanism; a scraping mechanism for scraping the flake caustic soda in the sampling groove 6 is provided at one end of the sampling tube 1 connected to the flake caustic soda hopper 2.

[0043] In order to facilitate the flake caustic soda collected by the sampling groove 6 to fall into the sampling bottle 10, the sampling port 8 preferably adopts a funnel-shaped structure.

[0044] In this embodiment, a sampling valve 11 is provided at the sampling port 8, one end of the sampling valve 11 is connected to the sampling port 8, and the other end is connected to the sampling cavity 9. The setting of the sampling valve 11 can seal and isolate the space in the sampling tube 1 after the sampling is completed, thereby ensuring the sealing of the sampling tube 1 and preventing the external environment from affecting the sampling.

[0045] A quick-release buckle 12 is fixedly connected to the bottom opening of the sampling cavity 9 , and the sampling bottle 10 is detachably fixedly connected to the quick-release buckle 12 . The quick-release buckle 12 can facilitate the disassembly and assembly of the sampling bottle 10 .

[0046] In this embodiment, the negative pressure suction mechanism includes a negative pressure cavity 20 and a negative pressure fan 21 installed in the negative pressure cavity 20. One end of the negative pressure cavity 20 is connected to the side wall of the sampling cavity 9, and the other end of the negative pressure cavity 20 is connected to the recovery container. The negative pressure suction mechanism adopts a negative pressure cavity 20 equipped with a negative pressure fan 21, and has a simple structure.

[0047] In this embodiment, a connecting hole 13 for the sampling rod 4 to pass through is provided on the side wall of the flake caustic soda hopper 2, and sealing mechanisms for sealing the connecting hole 13 are provided on both ends of the sampling rod 4. The sealing mechanisms at both ends of the sampling rod 4 can prevent the flake caustic soda in the flake caustic soda hopper 2 from being sucked out when the negative pressure suction mechanism sucks out the residual flake caustic soda in the sampling tube 1. At the same time, after the sampling is completed, the sealing mechanism close to the flake caustic soda hopper 2 can isolate the flake caustic soda hopper 2 and the sampling tube 1 to prevent the flake caustic soda in the flake caustic soda hopper 2 from entering the sampling tube 1 when no sampling is performed.

[0048] Specifically, the blocking mechanism includes a blocking plate 14, two of the blocking plates 14 are fixedly arranged on the sampling rod 4 at intervals, and the sampling slot 6 is arranged between the two blocking plates 14. The blocking mechanism adopts the blocking plate 14, and the blocking plate 14 is used to block the connecting hole 13, and the structure is simple.

[0049] In this embodiment, the scraping mechanism includes a second cylinder 15 and a first scraper 16. The second cylinder 15 is arranged vertically below one end of the sampling tube 1 connected to the flake caustic soda hopper 2. The output end of the second cylinder 15 is fixedly connected to the first scraper 16 for driving the first scraper 16 to extend into the sampling groove 6. The upper part of the first scraper 16 matches the cross-sectional shape of the sampling groove 6. The first scraper 16 is pushed by the second cylinder 15 so that the upper part of the first scraper 16 is inserted into the sampling groove 6. When the sampling rod 4 moves linearly, the flake caustic soda remaining on the inner wall of the sampling groove 6 is scraped off, and then the second cylinder 15 drives the first scraper 16 to retract and exit the sampling groove 6 without affecting the continued linear motion and rotation of the sampling rod 4.

[0050] Working principle: The present invention is a timed sampling method, and the sampling cycle is customized according to the number of bags discharged by the packaging machine PLC. After the sampler of the present invention receives the sampling signal, before the sampling rod 4 is inserted into the caustic soda ash hopper 2, the second cylinder 15 extends the first scraper 16 into the sampling slot 6, and the first cylinder 5 is started to extend the sampling rod 4 into the caustic soda ash hopper 2. In the process of the sampling rod 4 entering the caustic soda ash hopper 2, the first scraper 16 scrapes off the residual caustic soda ash in the sampling slot 6, and then the second cylinder 15 retracts the first scraper 16, and the sealing plate 14 on the end of the sampling rod 4 close to the first cylinder 5 seals the connecting hole 13, the sampling valve 11 is opened, and the negative pressure fan 21 is started to remove the residual caustic soda ash in the sampling tube 1 and the residual caustic soda ash in the sampling bottle 10. The residual flake caustic soda is extracted and recovered into the recovery container; the sampling valve 11 is closed, and the servo motor 7 drives the first cylinder 5 and the sampling rod 4 to rotate 180 degrees, so that the sampling slot 6 extending into the flake caustic soda hopper 2 is set upward. After standing for a period of time, the first cylinder 5 retracts the sampling rod 4, so that the blocking plate 14 on the end of the sampling rod 4 away from the first cylinder 5 seals the connecting hole 13, and the sampling valve 11 is opened. The servo motor 7 drives the first cylinder 5 and the sampling rod 4 to rotate 180 degrees, so that the opening of the sampling slot 6 is set downward, and the flake caustic soda in it is poured into the sampling bottle 10 to complete the sampling.

[0051] Embodiment 3

[0052] like Figure 3 As shown, this embodiment includes a sampling tube 1, one end of which is used to be fixed on the side wall of the caustic soda hopper 2, and the other end is fixedly provided with a closed bottom plate 3. A sampling rod 4 is provided in the sampling tube 1, and one end of the sampling rod 4 slides through and extends out of the closed bottom plate 3 and is coaxially connected to the output end of the first cylinder 5. The first cylinder 5 is used to drive the sampling rod 4 to insert into the caustic soda hopper 2; a sampling groove 6 is provided on the side wall of the end of the sampling rod 4 away from the first cylinder 5, and the first cylinder 5 is connected to the servo motor 5. The output shaft of the machine 7 is connected in a transmission manner and is used for axial rotation driven by the servo motor 7. The servo motor 7 is fixed to the periphery of the flake caustic soda hopper 2 through a mounting bracket. A sampling port 8 is provided on the bottom side of the sampling tube 1. A sampling cavity 9 is connected to the sampling port 8. The bottom of the sampling cavity 9 is detachably connected to a sampling bottle 10. A negative pressure suction mechanism is connected to the side wall of the sampling cavity 9. A scraping mechanism for scraping the flake caustic soda in the sampling groove 6 is provided at one end of the sampling tube 1 connected to the flake caustic soda hopper 2.

[0053] In order to facilitate the flake caustic soda collected by the sampling groove 6 to fall into the sampling bottle 10, the sampling port 8 preferably adopts a funnel-shaped structure.

[0054] In this embodiment, a sampling valve 11 is provided at the sampling port 8, one end of the sampling valve 11 is connected to the sampling port 8, and the other end is connected to the sampling cavity 9. The setting of the sampling valve 11 can seal and isolate the space in the sampling tube 1 after the sampling is completed, thereby ensuring the sealing of the sampling tube 1 and preventing the external environment from affecting the sampling.

[0055] A quick-release buckle 12 is fixedly connected to the bottom opening of the sampling cavity 9 , and the sampling bottle 10 is detachably fixedly connected to the quick-release buckle 12 . The quick-release buckle 12 can facilitate the disassembly and assembly of the sampling bottle 10 .

[0056] In this embodiment, the negative pressure suction mechanism includes a negative pressure cavity 20 and a negative pressure fan 21 installed in the negative pressure cavity 20. One end of the negative pressure cavity 20 is connected to the side wall of the sampling cavity 9, and the other end of the negative pressure cavity 20 is connected to the recovery container. The negative pressure suction mechanism adopts a negative pressure cavity 20 equipped with a negative pressure fan 21, and has a simple structure.

[0057] In this embodiment, a connecting hole 13 for the sampling rod 4 to pass through is provided on the side wall of the caustic soda hopper 2, and a blocking mechanism for blocking the connecting hole 13 is provided on both ends of the sampling rod 4. The blocking mechanisms at both ends of the sampling rod 4 can prevent the caustic soda in the caustic soda hopper 2 from being sucked out when the negative pressure suction mechanism sucks out the residual caustic soda in the sampling tube 1. At the same time, after the sampling is completed, the blocking mechanism close to the caustic soda hopper 2 can isolate the caustic soda hopper 2 and the sampling tube 1 to prevent the caustic soda in the caustic soda hopper 2 from entering the sampling tube 1 when no sampling is performed. Specifically, the connecting hole 13 is a circular hole, and at least both ends of the sampling rod 4 are cylindrical structures with a diameter the same as the inner diameter of the connecting hole 13, and the cylindrical structure and the circular hole are slidably sealed to form the blocking mechanism, and the two ends of the sampling rod 4 adopt cylindrical structures with a diameter the same as the inner diameter of the connecting hole 13, and the connecting hole 13 is blocked by a sliding seal, and the structure of the sampling rod 4 is simpler.

[0058] The scraping mechanism includes a flexible scraping brush 17 , the bottom end of which is fixed to the bottom inner wall of the sampling tube 1 . The scraping mechanism uses the flexible scraping brush 17 , which has a simple structure. Meanwhile, the flexible scraping brush 17 will not affect the linear motion and rotation of the sampling rod 4 .

[0059] Working principle: The present invention is a timed sampling method, and the sampling cycle is customized according to the number of bags discharged by the packaging machine PLC. After the sampler of the present invention receives the sampling signal, before the sampling rod 4 is inserted into the caustic soda ash hopper 2, the flexible scraper 17 is inserted into the sampling slot 6, and the first cylinder 5 is started to insert the sampling rod 4 into the caustic soda ash hopper 2. In the process of the sampling rod 4 entering the caustic soda ash hopper 2, the flexible scraper 17 scrapes off the residual caustic soda ash in the sampling slot 6, and the cylindrical mechanism at one end of the sampling rod 4 close to the first cylinder 5 seals the connecting hole 13, the sampling valve 11 is opened, and the negative pressure fan 21 is started to extract the residual caustic soda ash in the sampling tube 1 and the residual caustic soda ash in the sampling bottle 10 and recover them to the recovery container. device; close the sampling valve 11, the servo motor 7 drives the first cylinder 5 and the sampling rod 4 to rotate 180 degrees, so that the sampling slot 6 extending into the flake caustic soda hopper 2 is set upward, after standing for a period of time, the first cylinder 5 retracts the sampling rod 4, so that the cylindrical mechanism at one end of the sampling rod 4 away from the first cylinder 5 seals the connecting hole 13, and the sampling valve 11 is opened. The servo motor 7 drives the first cylinder 5 and the sampling rod 4 to rotate 180 degrees, so that the opening of the sampling slot 6 is set downward, and the flake caustic soda in it is poured into the sampling bottle 10 to complete the sampling.

[0060] Embodiment 4

[0061] like Figure 4 As shown, this embodiment includes a sampling tube 1, one end of which is used to be fixed on the side wall of the caustic soda hopper 2, and the other end is fixedly provided with a closed bottom plate 3. A sampling rod 4 is provided in the sampling tube 1, and one end of the sampling rod 4 slides through and extends out of the closed bottom plate 3 and is coaxially connected to the output end of the first cylinder 5. The first cylinder 5 is used to drive the sampling rod 4 to insert into the caustic soda hopper 2; a sampling groove 6 is provided on the side wall of the end of the sampling rod 4 away from the first cylinder 5, and the first cylinder 5 is connected to the servo motor 5. The output shaft of the machine 7 is connected in a transmission manner and is used for axial rotation driven by the servo motor 7. The servo motor 7 is fixed to the periphery of the flake caustic soda hopper 2 through a mounting bracket. A sampling port 8 is provided on the bottom side of the sampling tube 1. A sampling cavity 9 is connected to the sampling port 8. The bottom of the sampling cavity 9 is detachably connected to a sampling bottle 10. A negative pressure suction mechanism is connected to the side wall of the sampling cavity 9. A scraping mechanism for scraping the flake caustic soda in the sampling groove 6 is provided at one end of the sampling tube 1 connected to the flake caustic soda hopper 2.

[0062] In order to facilitate the flake caustic soda collected by the sampling groove 6 to fall into the sampling bottle 10, the sampling port 8 preferably adopts a funnel-shaped structure.

[0063] In this embodiment, a sampling valve 11 is provided at the sampling port 8, one end of the sampling valve 11 is connected to the sampling port 8, and the other end is connected to the sampling cavity 9. The setting of the sampling valve 11 can seal and isolate the space in the sampling tube 1 after the sampling is completed, thereby ensuring the sealing of the sampling tube 1 and preventing the external environment from affecting the sampling.

[0064] A quick-release buckle 12 is fixedly connected to the bottom opening of the sampling cavity 9 , and the sampling bottle 10 is detachably fixedly connected to the quick-release buckle 12 . The quick-release buckle 12 can facilitate the disassembly and assembly of the sampling bottle 10 .

[0065] In this embodiment, the negative pressure suction mechanism includes a negative pressure cavity 20 and a negative pressure fan 21 installed in the negative pressure cavity 20. One end of the negative pressure cavity 20 is connected to the side wall of the sampling cavity 9, and the other end of the negative pressure cavity 20 is connected to the recovery container. The negative pressure suction mechanism adopts a negative pressure cavity 20 equipped with a negative pressure fan 21, and has a simple structure.

[0066] In this embodiment, a connecting hole 13 for the sampling rod 4 to pass through is provided on the side wall of the caustic soda hopper 2, and a blocking mechanism for blocking the connecting hole 13 is provided on both ends of the sampling rod 4. The blocking mechanisms at both ends of the sampling rod 4 can prevent the caustic soda in the caustic soda hopper 2 from being sucked out when the negative pressure suction mechanism sucks out the residual caustic soda in the sampling tube 1. At the same time, after the sampling is completed, the blocking mechanism close to the caustic soda hopper 2 can isolate the caustic soda hopper 2 and the sampling tube 1 to prevent the caustic soda in the caustic soda hopper 2 from entering the sampling tube 1 when no sampling is performed. Specifically, the connecting hole 13 is a circular hole, and at least both ends of the sampling rod 4 are cylindrical structures with a diameter the same as the inner diameter of the connecting hole 13, and the cylindrical structure and the circular hole are slidably sealed to form the blocking mechanism, and the two ends of the sampling rod 4 adopt cylindrical structures with a diameter the same as the inner diameter of the connecting hole 13, and the connecting hole 13 is blocked by a sliding seal, and the structure of the sampling rod 4 is simpler.

[0067] The scraping mechanism includes a second scraper 18 and an elastic telescopic member 19. The bottom of the elastic telescopic member 19 is fixed to the bottom inner wall of the sampling tube 1. The top of the elastic telescopic member 19 is fixedly connected to the second scraper 18. The upper part of the second scraper 18 matches the cross-sectional shape of the sampling slot 6. The two ends of the sampling slot 6 are arc-shaped transitions. The scraping mechanism adopts the second scraper 18 driven by the elastic telescopic member 19. Since the two ends of the sampling slot 6 are arc-shaped transitions, the When the sampling rod 4 rotates to the sampling groove 6 facing downward, the second scraper 18 extends into the sampling groove 6 under the action of the elastic telescopic member 19. When the sampling rod 4 moves linearly and the second scraper 18 moves to the two ends of the sampling groove 6, under the action of the arc-shaped transition, the second scraper 18 separates from the sampling groove 6 along the arc-shaped transition and presses against the outer wall of the sampling rod 4. Since the two ends of the sampling rod 4 are cylindrical structures, the second scraper 18 abutting against the two ends of the sampling rod 4 will not affect the rotation of the sampling rod 4.

[0068] In this embodiment, the elastic telescopic member 19 includes an elastic seat fixed on the bottom inner wall of the sampling tube 1, a receiving groove is provided on the top of the elastic seat, the second scraper 18 is arranged in the receiving groove, and a compression spring is provided between the bottom of the second scraper 18 and the bottom of the receiving groove, and the compression spring applies an upward force to the second scraper 18. In order to prevent the second scraper 18 from escaping from the receiving groove, a guide groove is provided on the side wall of the receiving groove, and a limiting block is provided on the top of the guide groove. A protrusion is fixed on the bottom side wall of the second scraper 18, and the protrusion is slidably arranged in the guide groove.

[0069] Working principle: The present invention is a timed sampling method, and the sampling cycle is customized according to the number of bags discharged by the packaging machine PLC. After the sampler of the present invention receives the sampling signal, before the sampling rod 4 is inserted into the caustic soda ash hopper 2, the elastic telescopic part 19 drives the second scraper 18 to extend into the sampling slot 6, and the first cylinder 5 is started to insert the sampling rod 4 into the caustic soda ash hopper 2. In the process of the sampling rod 4 entering the caustic soda ash hopper 2, the second scraper 18 scrapes off the residual caustic soda ash in the sampling slot 6, and then under the action of the arc-shaped transition, the second scraper 18 separates from the sampling slot 6 along the arc-shaped transition and presses against the outer wall of the sampling rod 4. The cylindrical mechanism at one end of the sampling rod 4 close to the first cylinder 5 seals the connecting hole 13, opens the sampling valve 11, and starts the negative pressure fan 21 to fill the sampling tube 1 with the gas. The residual flake caustic soda and the residual flake caustic soda in the sampling bottle 10 are extracted and recovered into the recovery container; the sampling valve 11 is closed, and the servo motor 7 drives the first cylinder 5 and the sampling rod 4 to rotate 180 degrees, so that the sampling slot 6 extending into the flake caustic soda hopper 2 is set upward. After standing for a period of time, the first cylinder 5 retracts the sampling rod 4, so that the cylindrical mechanism at one end of the sampling rod 4 away from the first cylinder 5 seals the connecting hole 13, and the sampling valve 11 is opened. The servo motor 7 drives the first cylinder 5 and the sampling rod 4 to rotate 180 degrees, so that the opening of the sampling slot 6 is set downward, and the flake caustic soda in it is poured into the sampling bottle 10 to complete the sampling.

[0070] The present invention scrapes off the residual caustic soda in the sampling groove 6 before sampling, and then sucks and recovers the residual caustic soda through a negative pressure suction mechanism to prevent the residual caustic soda from affecting the representativeness of the sampling; the present invention performs automatic sampling in a completely closed state, and solves the problem of moisture absorption and unsafe factors of caustic soda in the manual sampling process causing injuries to personnel.

[0071] In the description of the present invention, it is necessary to understand that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0072] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic closed sampler for caustic soda flakes, characterized in that: The invention comprises a sampling tube (1), one end of which is used to be fixed on the side wall of a caustic soda ash hopper (2), and the other end of which is fixedly provided with a closed bottom plate (3). A sampling rod (4) is provided in the sampling tube (1), and one end of the sampling rod (4) slides through and extends out of the closed bottom plate (3) and is coaxially connected to the output end of a first cylinder (5). The first cylinder (5) is used to drive the sampling rod (4) to be inserted into the caustic soda ash hopper (2); a sampling groove (6) is provided on the side wall of the end of the sampling rod (4) away from the first cylinder (5). The first cylinder (5) is drivingly connected to the output shaft of the servo motor (7) and is used for axial rotation under the drive of the servo motor (7); a sampling port (8) is provided on the bottom side of the sampling tube (1), and a sampling cavity (9) is connected to the sampling port (8); the bottom of the sampling cavity (9) is detachably connected to a sampling bottle (10), and the side wall of the sampling cavity (9) is connected to a negative pressure suction mechanism; and a scraping mechanism for scraping off the flake caustic soda in the sampling trough (6) is provided at one end of the sampling tube (1) connected to the flake caustic soda hopper (2).

2. The automatic closed sampler for caustic soda flakes according to claim 1, characterized in that: A sampling valve (11) is provided at the sampling port (8); one end of the sampling valve (11) is connected to the sampling port (8), and the other end is connected to the sampling cavity (9).

3. The automatic closed sampler for caustic soda flakes according to claim 1, characterized in that: A quick-release buckle (12) is fixedly connected to the bottom opening of the sampling cavity (9), and the sampling bottle (10) is detachably fixedly connected to the quick-release buckle (12).

4. The automatic closed sampler for caustic soda flakes according to claim 1, characterized in that: A connecting hole (13) for the sampling rod (4) to pass through is provided on the side wall of the flake caustic soda hopper (2), and blocking mechanisms for blocking the connecting hole (13) are provided on both ends of the sampling rod (4).

5. The automatic closed sampler for caustic soda flakes according to claim 4, characterized in that: The blocking mechanism comprises a blocking plate (14), two blocking plates (14) are fixedly arranged on the sampling rod (4) at an interval, and the sampling groove (6) is arranged between the two blocking plates (14).

6. The automatic closed sampler for caustic soda flakes according to claim 4, characterized in that: The connecting hole (13) is a circular hole, and at least two ends of the sampling rod (4) are cylindrical structures with a diameter the same as the inner diameter of the connecting hole (13). The cylindrical structure and the circular hole are slidably sealed to form the blocking mechanism.

7. The automatic closed sampler for caustic soda flakes according to any one of claims 1 to 6, characterized in that: The scraping mechanism comprises a second cylinder (15) and a first scraper (16); the second cylinder (15) is arranged vertically below one end of the sampling tube (1) connected to the caustic soda ash hopper (2); the output end of the second cylinder (15) is fixedly connected to the first scraper (16) for driving the first scraper (16) to extend into the sampling trough (6); the upper part of the first scraper (16) matches the cross-sectional shape of the sampling trough (6).

8. The automatic closed sampler for caustic soda flakes according to any one of claims 1 to 6, characterized in that: The scraping mechanism comprises a flexible scraping brush (17), the bottom end of which is fixed on the bottom inner wall of the sampling tube (1).

9. The automatic closed sampler for caustic soda flakes according to claim 6, characterized in that: The scraping mechanism comprises a second scraper (18) and an elastic telescopic member (19), the bottom of the elastic telescopic member (19) is fixed to the bottom inner wall of the sampling tube (1), the top of the elastic telescopic member (19) is fixedly connected to the second scraper (18), the upper part of the second scraper (18) matches the cross-sectional shape of the sampling groove (6), and the two ends of the sampling groove (6) are arc-shaped transitions.

10. The automatic closed sampler for caustic soda flakes according to any one of claims 1 to 6, characterized in that: The negative pressure suction mechanism comprises a negative pressure cavity (20) and a negative pressure fan (21) installed in the negative pressure cavity (20); one end of the negative pressure cavity (20) is connected to the side wall of the sampling cavity (9), and the other end of the negative pressure cavity (20) is connected to a recovery container.

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