A vacuum suction sampling device and method for a centrifuge

Abstract

The application discloses a vacuum material suction sampling device and method for a centrifugal machine, and belongs to the technical field of centrifugal machines. The vacuum material suction sampling device for the centrifugal machine comprises a centrifugal machine body, the top end of a machine cover of the centrifugal machine body is fixed with a mounting shell, and the inside of the mounting shell is rotationally installed with a cutting rotating shaft penetrating through both ends and extending to the outside thereof. The top end of the cutting rotating shaft is provided with a sampling port. The top end of a sample collection tank is fixed with a vacuum pump through an adjusting pipeline, and the outside of the adjusting pipeline is fixed with a vacuum adjusting valve. The centrifugal machine does not need to be stopped during sampling, and sampling can be carried out before the centrifugal machine is unloaded, so that process analysis is realized, the production efficiency and the intelligent level are improved, the sampling pipe can move in multiple degrees of freedom, material samples at different positions in a rotating drum can be accurately obtained, the analysis result can better reflect the overall material condition, the sampling device can be installed on a standard or an increased interface of an existing centrifugal machine as a module, the transformation is convenient, and the sampling device is suitable for centrifugal machines of various types.

Description

Technical Field

[0001] This invention belongs to the field of centrifuge technology, specifically relating to a vacuum suction sampling device and method for centrifuges. Background Technology

[0002] Centrifuges are machines that use centrifugal force to separate components in a mixture of liquids and solid particles or liquids and liquids. Centrifuges are mainly used to separate solid particles from liquids in suspensions, or to separate two immiscible liquids with different densities in emulsions. They can also be used to remove liquids from wet solids, such as in a washing machine to spin-dry wet clothes. Special high-speed tubular centrifuges can also separate gas mixtures of different densities. Taking advantage of the different settling velocities of solid particles of different densities or sizes in liquids, some sedimentation centrifuges can also classify solid particles according to density or size. Centrifuges play an irreplaceable role as key equipment for solid-liquid separation in industries such as chemical and pharmaceutical manufacturing. Among them, vertical bottom discharge centrifuges have been widely used in industrial production due to their high separation efficiency.

[0003] In existing centrifuge production processes, quality control of materials inside the drum is a crucial step in ensuring product quality. To accurately grasp key parameters such as moisture content, purity, crystal morphology, and microbial indicators, timely and effective sampling and analysis of the materials inside the drum are necessary. However, current sampling methods require stopping the centrifuge, opening the cover, and manually sampling. This operation directly interrupts the production process, leading to a significant reduction in production efficiency and severely impacting the company's capacity and economic benefits. In centrifuge production scenarios involving toxic, harmful, or sterile materials, manual sampling not only exposes operators to hazardous environments but also easily causes material leaks due to improper operation, polluting the surrounding environment and seriously threatening personnel health and ecological safety. Furthermore, manual sampling makes it difficult to reach materials deep within the drum or in specific locations, resulting in samples that cannot accurately reflect the overall quality of the materials and severely affecting the accuracy and reliability of the analysis results. In addition, the method of sampling after unloading lacks flexibility; once material quality problems are discovered, the sampling strategy cannot be adjusted in time, missing opportunities to optimize production.

[0004] Therefore, there is an urgent need to provide a vacuum suction sampling device and method for centrifuges to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a vacuum suction sampling device and method for centrifuges.

[0006] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide a centrifuge core feeder, including a centrifuge body, wherein a mounting housing is fixed to the top of the cover of the centrifuge body, and a cutting shaft with both ends penetrating and extending to the outside is rotatably mounted inside the mounting housing; The top of the cutting shaft is provided with a sampling port, and a sample collection container is fixed to the sampling port through a connecting pipe. The connection end between the connecting pipe and the sampling port is a flexible tube. A vacuum pump is fixed to the top of the sample collection container via an adjustment pipe, and a vacuum regulating valve is fixed to the outside of the adjustment pipe.

[0007] With the above technical solution, when sampling the centrifuge body, the vacuum pump adjusts the pipeline to make the sample collection tank a negative pressure state. The vacuum regulating valve is used to control the magnitude of the sampling negative pressure, thereby controlling the sampling speed and sampling amount. The sample collection tank is used to collect the extracted material. The sample collection tank is designed as a quick-disassembly, sealed container with a sight glass and equipped with an exhaust filter. A discharge valve is provided at the bottom of the sample collection tank.

[0008] The present invention is further configured such that: a first air intake control valve is provided outside the connecting pipe, a gas purge pipe is fixed at one end of the connecting pipe, and a second air intake control valve is fixed outside the gas purge pipe.

[0009] Through the above technical solution, the first air intake control valve controls the opening and closing of the connecting pipe to start and stop the sampling process. After the sampling is completed, the second air intake control valve can be opened to introduce high-pressure gas into the connecting pipe through the gas purge pipe to achieve rapid cleaning of the pipe and ensure that the sampling is not contaminated.

[0010] The present invention is further configured such that: the cutting shaft is a hollow cylinder, one end of the cutting shaft is fixed with a sampling channel, the sampling port is connected to the sampling channel, one end of the sampling channel is fixed with a shaft scraper, and one end of the sampling channel is provided with a sampling nozzle.

[0011] With the above technical solution, when the cutting shaft rotates, the shaft scraper can simultaneously cut the material adhering to the inside of the centrifuge. At the same time, the sampling nozzle is connected to the sample collection tank through the sampling channel and sampling port. Under the action of the vacuum pump, the material sample after cutting can be accurately sucked up.

[0012] The present invention is further configured such that: a first hydraulic cylinder is fixed on one side of the mounting housing, and a hydraulic cylinder connecting rod is fixed to the outside of the piston rod of the first hydraulic cylinder by bolts.

[0013] With the above technical solution, when the first oil cylinder is working, its piston rod drives the oil cylinder connecting rod to extend and retract.

[0014] The present invention is further configured such that: one end of the cutting shaft is fixed with a clamping flange by bolts, and the interior of the clamping flange is fitted and connected to one end of the hydraulic cylinder connecting rod.

[0015] Through the above technical solution, the clamping flange and the hydraulic cylinder connecting rod are fitted together, and the hydraulic cylinder connecting rod can drive the cutting shaft to move up and down through the clamping flange.

[0016] The present invention is further configured such that: a fixing plate is fixed to the top of the mounting housing, and five proximity switches are fixed inside the fixing plate by bolts.

[0017] Through the above technical solution, five proximity switches can monitor the position of the cutting shaft in real time, ensuring the accuracy of sampling and cutting processes.

[0018] The present invention is further configured such that: a second hydraulic cylinder is fixed to the inner wall of the mounting housing, and a mounting rack is fixed to one end of the piston rod of the second hydraulic cylinder.

[0019] With the above technical solution, when the second oil cylinder is working, its piston rod drives the rack to move back and forth.

[0020] The present invention is further configured such that: a mounting gear is fixed to the outside of the cutting shaft, and the outside of the mounting gear meshes with one side of the mounting rack.

[0021] Through the above technical solution, the rack and pinion mesh with the gear, thereby driving the cutting shaft to rotate.

[0022] The sampling method of the vacuum suction sampling device of the centrifuge includes the following specific steps: Step 1: Preparation stage: The centrifuge body is running normally, and the material forms a material layer in the drum. Start the first and second oil cylinders, adjust the rotating shaft scraper to the filter cake position, adjust the sampling nozzle to the target sampling position, turn on the vacuum pump, and adjust the negative pressure in the sample collection tank to the preset value through the vacuum regulating valve. Step 2: Sampling stage: Open the first air intake control valve to connect the connecting pipe to the sample collection tank. Under the action of pressure difference, the material in the drum enters the sample collection tank through the sampling nozzle, sampling channel, cutting shaft, sampling port and connecting pipe. The negative pressure and sampling time are controlled by the vacuum regulating valve to control the sampling amount. After the preset sampling amount is reached, the first air intake control valve is closed to stop sampling. Step 3: Cleaning and Reset Stage: Turn off the vacuum pump, open the second air intake control valve, and introduce high-pressure gas into the connecting pipe to purge residual materials from the inner wall of the pipe. After purging, close the second air intake control valve, open the discharge valve of the sample collection tank to discharge the sample, disassemble the sample collection tank for cleaning, and simultaneously start the first and second oil cylinders to lift and rotate the sampling channel to a non-working position or completely remove it from the centrifuge body.

[0023] The beneficial effects of this invention are as follows: (1) The present invention does not require stopping the machine during sampling. It can take samples before the centrifuge unloads, realize process analysis, improve production efficiency and intelligence level. The sampling tube can move with multiple degrees of freedom, accurately obtain material samples at different positions in the drum, and the analysis results can better reflect the overall material condition. It can be installed as a module on the standard or additional interface of the existing centrifuge, which is convenient for modification and applicable to various models of centrifuges. (2) The present invention operates in a closed system during sampling, isolating the sample from the external environment. Operators do not need to directly contact the inside of the centrifuge and the materials. It is particularly suitable for the production of sterile, toxic or high-purity products. The pipeline purging function prevents material residue and blockage, reduces safety risks and labor intensity, and is easy to automate and remotely control. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a partially enlarged structural diagram of the present invention; Figure 3 for Figure 2 A sectional view along the AA direction.

[0025] In the diagram: 1. Centrifuge body; 2. Mounting housing; 3. Cutting shaft; 4. Sampling channel; 5. Shaft scraper; 6. Sampling port; 7. Sample collection container; 8. First intake control valve; 9. Vacuum pump; 10. Vacuum regulating valve; 11. Second intake control valve; 12. First hydraulic cylinder; 13. Hydraulic cylinder connecting rod; 14. Clamping flange; 15. Fixing plate; 16. Proximity switch; 17. Second hydraulic cylinder; 18. Mounting rack; 19. Mounting gear. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] Please see Figures 1-3A centrifuge core feeder includes a centrifuge body 1. A mounting housing 2 is fixed to the top of the centrifuge body 1's cover. A cutting shaft 3, with both ends extending through and to the outside, is rotatably mounted inside the mounting housing 2. A sampling port 6 is located at the top of the cutting shaft 3. A sample collection container 7 is fixed to the sampling port 6 via a connecting pipe. The connection between the connecting pipe and the sampling port 6 is a flexible hose. A vacuum pump 9 is fixed to the top of the sample collection container 7 via an adjusting pipe. A vacuum regulating valve 10 is fixed to the outside of the adjusting pipe. A first air intake control valve 8 is located outside the connecting pipe. A gas purging pipe is fixed to one end of the connecting pipe, and a second air intake control valve 11 is fixed to the outside of the gas purging pipe. When sampling the centrifuge body 1, the vacuum pump 9 adjusts the pipeline to make the sample collection tank 7 under negative pressure. The vacuum regulating valve 10 is used to control the magnitude of the sampling negative pressure, thereby controlling the sampling speed and sample volume. The sample collection tank 7 is used to collect the extracted material. The sample collection tank 7 is designed as a quick-disassembly, sealed container with a sight glass and equipped with an exhaust filter. A discharge valve is provided below the sample collection tank 7. The first air inlet control valve 8 controls the opening and closing of the connecting pipeline to realize the start and stop of the sampling process. After the sampling is completed, the second air inlet control valve 11 can be opened to introduce high-pressure gas into the connecting pipeline through the gas purge pipe to realize the rapid cleaning of the pipeline and ensure that the sampling is not contaminated.

[0028] like Figure 2 and Figure 3As shown, the cutting shaft 3 is a hollow cylinder. A sampling channel 4 is fixed to one end of the cutting shaft 3, and a sampling port 6 is connected to the sampling channel 4. A shaft scraper 5 is fixed to one end of the sampling channel 4, and a sampling nozzle is provided at one end of the sampling channel 4. A first hydraulic cylinder 12 is fixed to one side of the mounting housing 2. A hydraulic cylinder connecting rod 13 is bolted to the outside of the piston rod of the first hydraulic cylinder 12. A clamping flange 14 is bolted to one end of the cutting shaft 3, and the inside of the clamping flange 14 is fitted into one end of the hydraulic cylinder connecting rod 13. A fixing plate 15 is fixed to the top of the mounting housing 2, and five proximity switches 16 are bolted to the inside of the fixing plate 15. A second hydraulic cylinder 17 is fixed to the inner wall of the mounting housing 2. A mounting rack 18 is fixed to one end of the piston rod of the second hydraulic cylinder 17. A mounting gear 19 is fixed to the outside of the cutting shaft 3. The gear 19 meshes with one side of the rack 18. When the first cylinder 12 is working, its piston rod drives the cylinder connecting rod 13 to extend and retract. The clamping flange 14 is engaged with the cylinder connecting rod 13. The cylinder connecting rod 13 can drive the cutting shaft 3 to move up and down through the clamping flange 14. Five proximity switches 16 can monitor the position of the cutting shaft 3 in real time to ensure the accuracy of sampling and cutting. When the second cylinder 17 is working, its piston rod drives the rack 18 to move back and forth. The rack 18 meshes with the gear 19, thereby driving the cutting shaft 3 to rotate. The cutting shaft 3 drives the shaft scraper 5 to cut the material adhering inside the centrifuge. At the same time, the sampling nozzle is connected to the sample collection tank 7 through the sampling channel 4 and the sampling port 6. Under the action of the vacuum pump 9, the material sample after cutting can be accurately sucked up.

[0029] The sampling method of the vacuum suction sampling device of the centrifuge includes the following specific steps: Step 1: Preparation stage: The centrifuge body 1 is running normally, and the material forms a material layer in the drum. Start the first oil cylinder 12 and the second oil cylinder 17, adjust the rotating shaft scraper 5 to the filter cake position, adjust the sampling nozzle to the target sampling position, turn on the vacuum pump 9, and adjust the negative pressure in the sample collection tank 7 to the preset value through the vacuum regulating valve 10. Step 2: Sampling stage: Open the first air intake control valve 8 to connect the connecting pipe to the sample collection tank 7. Under the action of pressure difference, the material in the drum enters the sample collection tank 7 through the sampling nozzle, sampling channel 4, cutting shaft 3, sampling port 6 and connecting pipe. The vacuum regulating valve 10 controls the negative pressure and the sampling time to control the sampling amount. After the preset sampling amount is reached, close the first air intake control valve 8 to stop sampling. Step 3: Cleaning and Reset Stage: Turn off vacuum pump 9, open the second air intake control valve 11, and introduce high-pressure gas into the connecting pipe to purge residual materials from the inner wall of the pipe. After purging, close the second air intake control valve 11, open the discharge valve of the sample collection tank 7 to discharge the sample, disassemble the sample collection tank 7 for cleaning, and simultaneously start the first oil cylinder 12 and the second oil cylinder 17 to lift and rotate the sampling channel 4 to a non-working position or completely remove it from the centrifuge body 1.

[0030] When using this invention, the vacuum pump 9 is turned on, the negative pressure in the sample collection tank 7 is adjusted to a preset value by the vacuum regulating valve 10, the first air intake control valve 8 is turned on, the connecting pipe is connected to the sample collection tank 7, and the system enters the sampling standby state.

[0031] The first hydraulic cylinder 12 is activated, and its piston rod drives the hydraulic cylinder connecting rod 13 to extend and retract. Through the clamping flange 14, the cutting shaft 3 and the shaft scraper 5 move up and down along the inner wall of the centrifuge. Five proximity switches 16 can monitor the position of the cutting shaft 3 in real time to ensure the accuracy of the sampling and cutting process.

[0032] Simultaneously, the second oil cylinder 17 is activated, and its piston rod drives the mounting rack 18 to move back and forth. The mounting rack 18 drives the mounting gear 19 to rotate, which in turn drives the cutting shaft 3 and the shaft scraper 5 to rotate, cutting and peeling off the material adhering to the inner wall of the centrifuge.

[0033] The cut material is drawn into the sample collection tank 7 through the sampling nozzle, sampling channel 4 and sampling port 6 under the negative pressure of the vacuum pump 9. The sample collection is observed through the sight glass. After the preset sampling amount is reached, the first air inlet control valve 8 is closed to stop sampling.

[0034] After sampling is completed, turn off the vacuum pump 9 and open the second air intake control valve 11. High-pressure gas enters the connecting pipeline through the gas purging pipe to purge the material remaining on the inner wall of the pipeline. After purging is completed, close the second air intake control valve 11.

[0035] Open the discharge valve at the bottom of sample collection tank 7 to discharge the collected sample, disassemble sample collection tank 7 for cleaning, and complete one sampling process.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A vacuum suction sampling device for a centrifuge, comprising a centrifuge body (1), characterized in that: The centrifuge body (1) has a mounting housing (2) fixed at the top of the cover, and a cutting shaft (3) with both ends passing through and extending to the outside is rotatably mounted inside the mounting housing (2). The top of the cutting shaft (3) is provided with a sampling port (6), and a sample collection container (7) is fixed to the sampling port (6) through a connecting pipe. The connecting pipe and the sampling port (6) are connected by a flexible hose. A vacuum pump (9) is fixed to the top of the sample collection container (7) via an adjustment pipe, and a vacuum regulating valve (10) is fixed to the outside of the adjustment pipe.

2. The vacuum suction sampling device for a centrifuge according to claim 1, characterized in that, The connecting pipe is provided with a first air intake control valve (8) on its outside, and a gas purge pipe is fixed at one end of the connecting pipe. A second air intake control valve (11) is fixed on the outside of the gas purge pipe.

3. The vacuum suction sampling device for a centrifuge according to claim 2, characterized in that, The cutting shaft (3) is a hollow cylinder. A sampling channel (4) is fixed at one end of the cutting shaft (3). The sampling port (6) is connected to the sampling channel (4). A shaft scraper (5) is fixed at one end of the sampling channel (4). A sampling nozzle is provided at one end of the sampling channel (4).

4. The vacuum suction sampling device for a centrifuge according to claim 3, characterized in that, A first oil cylinder (12) is fixed on one side of the mounting housing (2), and an oil cylinder connecting rod (13) is fixed to the outside of the piston rod of the first oil cylinder (12) by bolts.

5. The vacuum suction sampling device for a centrifuge according to claim 4, characterized in that, One end of the cutting shaft (3) is fixed with a clamping flange (14) by bolts, and the interior of the clamping flange (14) is fitted and connected to one end of the cylinder connecting rod (13).

6. The vacuum suction sampling device for a centrifuge according to claim 5, characterized in that, The top of the mounting housing (2) is fixed with a fixing plate (15), and five proximity switches (16) are fixed inside the fixing plate (15) by bolts.

7. The vacuum suction sampling device for a centrifuge according to claim 6, characterized in that, The inner wall of the mounting housing (2) is fixed with a second oil cylinder (17), and one end of the piston rod of the second oil cylinder (17) is fixed with a mounting rack (18).

8. The vacuum suction sampling device for a centrifuge according to claim 7, characterized in that, The cutting shaft (3) is fixed with a mounting gear (19) on the outside, and the outside of the mounting gear (19) meshes with one side of the mounting rack (18).

9. The sampling method of the vacuum suction sampling device for a centrifuge according to any one of claims 1-8, characterized in that, The specific steps include the following: Step 1: Preparation stage: The centrifuge body (1) is running normally, and the material forms a material layer in the drum. Start the first oil cylinder (12) and the second oil cylinder (17), adjust the rotating shaft scraper (5) to the filter cake position, adjust the sampling nozzle to the target sampling position, turn on the vacuum pump (9), and adjust the negative pressure in the sample collection tank (7) to the preset value through the vacuum regulating valve (10). Step 2: Sampling stage: Open the first air intake control valve (8) to connect the connecting pipe to the sample collection tank (7). Under the action of pressure difference, the material in the drum enters the sample collection tank (7) through the sampling nozzle, sampling channel (4), cutting shaft (3), sampling port (6) and connecting pipe. The negative pressure and sampling time are controlled by the vacuum regulating valve (10) to control the sampling amount. After the preset sampling amount is reached, close the first air intake control valve (8) to stop sampling. Step 3: Cleaning and Reset Stage: Turn off the vacuum pump (9), open the second air intake control valve (11), introduce high-pressure gas into the connecting pipe to purge the residual material on the inner wall of the pipe, close the second air intake control valve (11) after purging, open the discharge valve of the sample collection tank (7) to discharge the sample, disassemble the sample collection tank (7) for cleaning, and at the same time start the first oil cylinder (12) and the second oil cylinder (17) to lift and rotate the sampling channel (4) to a non-working position or completely exit the centrifuge body (1).

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