Continuous sampling device and continuous sampling method thereof

Abstract

The present invention discloses a continuous sampling device and a continuous sampling method thereof, comprising a sampling cylinder, wherein a movable piston is provided in the sampling cylinder, the piston dividing the interior of the sampling cylinder into a storage chamber and a return chamber; the storage chamber is provided with a sampling port and a sample outlet tube, both of which are unidirectional; the movement of the piston allows the sample to be drawn into the storage chamber through the sampling port and then extruded from the storage chamber through the sample outlet tube; the sample outlet tube is connected to a return tube, which communicates with the interior of the sampling cylinder; the movement of the piston causes the return chamber to expand and generate negative pressure, which, after expansion, communicates with the return tube, allowing the sample in the sample outlet tube to be drawn into the return chamber under the action of the negative pressure. The present invention facilitates continuous multiple sampling.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling devices, and in particular to a continuous sampling device and a continuous sampling method thereof. Background Art

[0002] Coal coking, also known as high-temperature coal distillation, is a coal conversion process that uses coal as raw material. It is heated to approximately 950°C in an airless environment, where it undergoes high-temperature distillation to produce coke, while also producing coal gas, coal tar, and other chemical products. The coke produced by coal coking is primarily used in ironmaking, with a small amount used as a chemical raw material in the manufacture of calcium carbide and electrodes.

[0003] During the coal coking process, it is necessary to sample and test the substances and gases produced. This requires the use of a coal coking explosion-proof sampling device, which is inserted into the coal coking equipment to sample the substances and gases produced by the coal coking process.

[0004] After the existing coal coking sampling device is completed, when testing the sampled materials and gases, it is necessary to remove the device from the coal coking equipment, and then operate the piston to press the materials and gases out of the inner tank before testing can be carried out. Continuous sampling cannot be carried out. Usually, in order to ensure the accuracy of sampling and testing, multiple sampling is required. The existing coal coking sampling device is very inconvenient when performing multiple sampling. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a continuous sampling device and a continuous sampling method thereof, which facilitate continuous multiple sampling.

[0006] Technical solution: To achieve the above-mentioned purpose, the present invention provides a continuous sampling device and a continuous sampling method thereof, comprising a sampling cylinder, wherein a movable piston is provided in the sampling cylinder, and the piston divides the interior of the sampling cylinder into a storage chamber and a return chamber; a sampling port and a sample outlet tube are provided on the storage chamber, and the sampling port and the sample outlet tube are both unidirectional; the movement of the piston can make the sample be sucked into the storage chamber through the sampling port, and then squeezed out of the storage chamber from the sample outlet tube; a return tube is connected to the sample outlet tube, and the return tube is connected to the interior of the sampling cylinder; the movement of the piston can make the return chamber expand and generate negative pressure, and the return chamber is connected to the return tube after expansion, so that the sample in the sample outlet tube is sucked into the return chamber under the action of negative pressure.

[0007] Furthermore, the piston is driven to move by a movable rod; a sealing pipe part is provided on the movable rod, and the movable rod and the piston can move relative to each other along the moving direction of the piston, so that the sealing pipe part and the piston are fitted together or relatively separated; in the process of the movable rod moving toward the storage chamber, the sealing pipe part and the piston are fitted together, and the piston and the sealing pipe part are connected to seal the return pipe; in the process of the movable rod moving toward the return chamber, the sealing pipe part and the piston are relatively separated and a connecting gap is formed, so that the return pipe can be connected with the return chamber through the connecting gap.

[0008] Furthermore, the sealing member is a sealing ring; the outer ring surface of the sealing ring fits against the inner wall of the sampling tube, so that the sealing ring can seal the return pipe; the sealing ring is fixed on the movable rod through a hollow bracket structure, so that the formed connecting gap can be connected to the return cavity.

[0009] Furthermore, a sliding cavity is provided in the piston, and a blocking block is provided at the end of the movable rod. The blocking block is slidably provided in the sliding cavity, and a limiting structure is provided in the sliding cavity to prevent the blocking block from detaching; the sliding of the blocking block in the sliding cavity enables the movable rod and the piston to move relative to each other along the moving direction of the piston.

[0010] Furthermore, a discharge port is provided on the return cavity, which is unidirectional and can squeeze out the sample from the discharge port when the return cavity contracts.

[0011] Furthermore, when the movable rod moves toward the return chamber to the stroke limit, the end of the return tube communicating with the sampling cylinder is still blocked by the piston.

[0012] Furthermore, a blocking block is provided on the piston; when the movable rod moves toward the storage chamber to the stroke limit, the pipe sealing member blocks the return pipe, and the blocking block blocks the sampling port.

[0013] Furthermore, the return tube is connected to one end of the sample outlet tube close to the sampling cylinder.

[0014] Furthermore, a continuous sampling method for a continuous sampling device includes the following steps: S1: the movable rod drives the piston to move toward the return chamber, so that the sample is sucked into the storage chamber through the sampling port; S2: the movable rod drives the piston to move toward the storage chamber, so that the sample in the storage chamber is squeezed out from the sample outlet tube, and the return chamber expands and generates negative pressure; S3: the movable rod moves toward the storage chamber to the stroke limit, at this time the blocking block corresponds to blocking the sampling port, the sealing piece corresponds to blocking the return tube, and there is residual sample in the sample outlet tube; S4: the movable rod quickly moves toward the return chamber for a distance and then pauses, so that the sealing piece is separated from the piston, the return tube is connected to the return chamber, and the residual sample in the sample outlet tube is sucked into the return chamber under the action of negative pressure; S5: the movable rod continues to move toward the return chamber, driving the piston to compress the return chamber, so that the sample sucked into the return chamber is squeezed out from the discharge port, and the storage chamber expands, so that the new sample is sucked into the storage chamber through the sampling port, and then steps S2 to S5 are cycled.

[0015] Furthermore, in step S4, the speed at which the movable rod moves toward the return chamber is greater than the speed at which the piston moves toward the return chamber under the action of the negative pressure in the return chamber; and the moving distance of the movable rod is less than the depth of the blocking block inserted into the sampling port, so that after the movable rod stops moving, the sampling port is still in a blocked state.

[0016] Beneficial effects: The continuous sampling device and continuous sampling method of the present invention have the following beneficial effects:

[0017] 1) The sampling tube is equipped with a one-way sampling port and a sample outlet tube. When sampling, the sample can be directly discharged through the sample outlet tube without removing the entire sampling device, which is convenient for continuous sampling.

[0018] 2) It is easy for samples to remain in the sample outlet tube. By setting up a return tube and a return chamber, the residual sample in the sample outlet tube can be sucked into the return chamber, so that the sample outlet of the sample outlet tube will not be mixed with a large amount of residual sample from the previous sampling, so that each sample is relatively independent during continuous sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attachment Figure 1 Schematic diagram of the overall structure of the continuous sampling device of the present invention;

[0020] Attachment Figure 2 Schematic diagram of the internal structure of the sampling tube;

[0021] Attachment Figure 3 It is a structural diagram when the movable rod moves toward the storage chamber to the limit of its stroke;

[0022] Attachment Figure 4 It is a structural diagram when the sealing ring and the piston are relatively separated;

[0023] Attachment Figure 5 It is a structural diagram when the stirring rod moves toward the return chamber to the limit of its stroke;

[0024] Attachment Figure 6 This is a step diagram of the continuous sampling method of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] As attached Figures 1 to 6 The continuous sampling device and continuous sampling method include a sampling cylinder 1, in which a movable piston 2 is provided. The piston 2 can slide along the length direction of the sampling cylinder 1, and the surface of the piston 2 is in sliding and sealing cooperation with the inner wall of the sampling cylinder 1.

[0027] The piston 2 divides the interior of the sampling tube 1 into a storage chamber 3 and a return chamber 4. The storage chamber 3 is provided with a sampling port 5 and a sample outlet tube 6. Both the sampling port 5 and the sample outlet tube 6 are provided with a one-way valve 15, so that the sampling port 5 and the sample outlet tube 6 are both unidirectional. The movement of the piston 2 allows the sample to be sucked into the storage chamber 3 through the sampling port 5, and then squeezed out of the storage chamber 3 from the sample outlet tube 6, thereby achieving continuous sampling. For example, when the present device is applied in the field of coal coking sampling, the sampling tube 1 is extended into the coal coking equipment, and then the outlet end of the sample outlet tube 6 is led out of the coal coking equipment. After the sampling tube 1 sucks the sample in the coal coking equipment, the sample is directly squeezed out of the coal coking equipment through the sample outlet tube 6, without the need to remove the entire sampling device from the coal coking equipment, which is convenient for continuous multiple sampling.

[0028] During the process of the sample being guided out of the storage chamber 3 through the sample guide tube 6, some sample will remain in the sample guide tube 6. Therefore, when multiple consecutive samplings are performed, the sample guided out of the sample guide tube 6 will be mixed with residual sample from previously taken samples. Therefore, a return tube 7 is connected to the sample guide tube 6, which communicates with the interior of the sampling cylinder 1. The movable displacement of the piston 2 toward the storage chamber 3 causes the return chamber 4 to expand and generate negative pressure. After the return chamber 4 expands, it communicates with the return tube 7, causing the sample in the sample guide tube 6 to be drawn into the return chamber 4 under the action of the negative pressure, thereby clearing out any residual sample in the sample guide tube 6 and preventing the individual samples from mixing with each other during multiple samplings.

[0029] As attached Figure 2 As shown in the figure, the piston 2 is driven to move by the movable rod 8, and the movable rod 8 is driven to extend and retract by the electric cylinder 16. A sealing plate 17 is provided at the end of the sampling tube 1 opposite to the sampling port 5, and the return chamber 4 is formed between the sealing plate 17 and the piston 2. The sealing plate 17 is provided with a sliding hole, and the movable rod 8 slides and seals with the sliding hole. The movable rod 8 is provided with a sealing member, which is arranged on the end of the movable rod 8 near the piston 2. The movable rod 8 and the piston 2 can move relative to each other along the moving direction of the piston 2, so that the sealing member and the piston 2 can fit together or be relatively separated.

[0030] During the movement of the movable rod 8 toward the material storage chamber 3, the sealing member and the piston 2 are in contact with each other, and the piston 2 and the sealing member are connected to block the return pipe 7. Therefore, during the movement of the movable rod 8 toward the material storage chamber 3, the return pipe 7 and the return chamber 4 are always disconnected. Therefore, during the process of leading the sample from the sample lead pipe 6 to the collection container, the sample lead pipe 6 will not be sucked back. After the sample is led out, the sample lead pipe 6 is separated from the collection container, and the movable rod 8 moves back. During the movement of the movable rod 8 toward the return chamber 4, the sealing member and the piston 2 are relatively separated and a connecting gap 9 is formed, so that the return pipe 7 can be connected to the return chamber 4 through the connecting gap 9. At this time, the return chamber 4 sucks in the residual sample in the sample lead pipe 6 through the return pipe 7. Therefore, the existence of the sealing tube makes the communication between the return tube 7 and the return chamber 4 triggered by the movement of the movable rod 8 toward the return chamber 4, rather than by the movement of the movable rod 8 toward the storage chamber 3, which can effectively prevent the back suction phenomenon during the sample derivation process. Moreover, due to the existence of the sealing tube, when the movable rod 8 moves toward the storage chamber 3 to the limit of the stroke, as shown in the attached figure, the return tube 7 and the return chamber 4 are connected. Figure 5 As shown in , the storage cavity 3 can be correspondingly contracted to the limit, thereby squeezing out all the samples in the storage cavity 3 to avoid residual samples in the storage cavity 3 .

[0031] As attached Figure 3 and 4 As shown in , a sliding cavity 10 is provided in the piston 2, and a block 11 is provided at the end of the movable rod 8. The block 11 is slidably provided in the sliding cavity 10, and a limiting structure is provided in the sliding cavity 10 to prevent the block 11 from escaping. The cavity opening of the sliding cavity 10 is narrow, which can prevent the block 11 from escaping from the sliding cavity 10, and the cavity opening of the sliding cavity 10 and the movable rod 8 are in sliding and sealing cooperation. The length of the block 11 is less than the length of the sliding cavity 10. The sliding of the block 11 in the sliding cavity 10 can enable the movable rod 8 and the piston 2 to move relative to each other along the moving direction of the piston 2.

[0032] The sealing member is a sealing ring 12. Its outer surface fits against the inner wall of the sampling tube 1, sealing the return tube 7. Movement of the movable rod 8 causes the sealing ring 12 to slide along the inner wall of the sampling tube 1. The sealing ring 12 is secured to the movable rod 8 via a hollow support structure, allowing the formed communication gap 9 to communicate with the return chamber 4 through the hollow support structure.

[0033] The return chamber 4 is provided with a discharge port 13, which is arranged at one end of the return chamber 4 near the sealing plate 17. The discharge port 13 is unidirectional and a one-way valve 15 is provided in the discharge port 13. When the piston 2 squeezes the return chamber 4 to shrink the return chamber 4, the sample in the return chamber 4 can be squeezed out from the discharge port 13. When the movable rod 8 moves toward the return chamber 4 to the limit of its stroke, a certain distance is still left between the piston 2 and the sealing plate 17, so that the return chamber 4 retains a certain space, so that the negative pressure generated when the return chamber 4 expands will not be too large, thereby preventing the movable rod 8 from being unable to move toward the storage chamber 3 due to excessive negative pressure. In addition, when the movable rod 8 moves toward the return chamber 4 to the limit of its stroke, the end of the return tube 7 connected to the sampling cylinder 1 is still blocked by the piston 2, preventing the return tube 7 and the storage chamber 3 from communicating with each other.

[0034] The piston 2 is provided with a plugging block 14. When the movable rod 8 moves toward the storage chamber 3 to the limit of its travel, the pipe sealing member correspondingly blocks the return pipe 7, and the plugging block 14 is correspondingly inserted into the sampling port 5, thereby correspondingly blocking the sampling port 5. The sample outlet pipe 6 is connected to the end of the storage chamber 3 away from the return chamber 4. When the movable rod 8 moves toward the storage chamber 3 to the limit of its travel, the piston 2 presses against the inner wall of the storage chamber 3, compressing the storage chamber 3 to its limit, and the sample in the storage chamber 3 is completely squeezed out of the sample outlet pipe 6.

[0035] The return tube 7 is connected to the end of the sample outlet tube 6 close to the sampling cylinder 1, so that the return chamber 4 can absorb the residual sample in the sample outlet tube 6 as much as possible through the return tube 7. If the return tube 7 is connected to the end of the sample outlet tube 6 away from the sampling cylinder 1, the effect of absorbing the residual sample is not good.

[0036] The continuous sampling method of the continuous sampling device of the present invention comprises the following steps:

[0037] S1: The movable rod 8 drives the piston 2 to move toward the return chamber 4, so that the sample is sucked into the storage chamber 3 through the sampling port 5;

[0038] S2: The movable rod 8 drives the piston 2 to move toward the storage chamber 3. During the movement, the piston 2 squeezes the sample in the storage chamber 3, causing the sample in the storage chamber 3 to be squeezed out from the sample outlet tube 6. The operator collects the sample squeezed out from the sample outlet tube 6 through a collection container. Due to the presence of the sample outlet tube 6, it is convenient to obtain the sample without having to remove the entire sampling device, which is convenient to operate. At the same time, the return chamber 4 expands and generates negative pressure.

[0039] S3: The movable rod 8 moves toward the storage chamber 3 to the limit of its stroke. At this time, the piston 2 contacts the inner wall of the storage chamber 3. The storage chamber 3 contracts to its limit. The sample in the storage chamber 3 is squeezed out from the sample outlet tube 6. The blocking block 14 blocks the sampling port 5. The sealing member blocks the return tube 7. There is residual sample in the sample outlet tube 6.

[0040] S4: The movable rod 8 quickly moves toward the return chamber 4 for a distance and then pauses. The block 11 slides in the sliding chamber 10, and the block 11 does not collide with the piston 2 during the sliding process, so that the sealing tube is separated from the piston 2. Since a communication gap 9 is generated after the sealing tube is separated from the piston 2, the return pipe 7 can be connected to the return chamber 4 through the communication gap 9, so that the residual sample in the sample outlet tube 6 is sucked into the return chamber 4 under the action of negative pressure, thereby cleaning the sample outlet tube 6; when the movable rod 8 is paused, the return pipe 7 remains connected to the return chamber 4, leaving enough time for the return chamber 4 to completely absorb the sample in the sample outlet tube 6;

[0041] S5: The movable rod 8 pauses for a period of time to allow the sample in the sample outlet tube 6 to be completely sucked into the return chamber 4. The movable rod 8 continues to move toward the return chamber 4, driving the piston 2 to compress the return chamber 4, so that the sample sucked into the return chamber 4 is squeezed out from the discharge port 13. At the same time, the storage chamber 3 is also expanding, so that the new sample can be sucked into the storage chamber 3 through the sampling port 5, and then steps S2 to S5 are circulated to perform multiple samplings continuously.

[0042] In step S4, the speed at which the movable rod 8 moves toward the return chamber 4 is greater than the speed at which the piston 2 moves toward the return chamber 4 under the action of the negative pressure in the return chamber 4, so that the rapid movement of the movable rod 8 toward the return chamber 4 will inevitably separate the sealing ring 12 from the piston 2, so that the return chamber 4 and the return pipe 7 are connected to each other; and the moving distance of the movable rod 8 is less than the depth of the plugging block 14 inserted into the sampling port 5, so that after the movable rod 8 stops moving, the sampling port 5 is still in a blocked state, so that the negative pressure in the return chamber 4 acts on the discharge port of the sample outlet tube 6 instead of the sampling port 5, so as to better absorb the residual sample in the sample outlet tube 6.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A continuous sampling device, characterized in that: The invention comprises a sampling cylinder (1), wherein a movable piston (2) is provided in the sampling cylinder (1), and the piston (2) divides the interior of the sampling cylinder (1) into a storage chamber (3) and a return chamber (4); a sampling port (5) and a sample outlet tube (6) are provided on the storage chamber (3), and the sampling port (5) and the sample outlet tube (6) are both unidirectional; the movement of the piston (2) enables the sample to be sucked into the storage chamber (3) through the sampling port (5), and then squeezed out of the storage chamber (3) from the sample outlet tube (6); a return tube (7) is connected to the sample outlet tube (6), and the return tube (7) is connected to the interior of the sampling cylinder (1); the movement of the piston (2) enables the return chamber (4) to expand and generate negative pressure, and the return chamber (4) is connected to the return tube (7) after expansion, so that the sample in the sample outlet tube (6) is sucked into the return chamber (4) under the action of the negative pressure; The piston (2) is driven to move by the movable rod (8); a pipe sealing member is provided on the movable rod (8), and the movable rod (8) and the piston (2) can move relative to each other along the moving direction of the piston (2), so that the pipe sealing member and the piston (2) are in contact with each other or relatively separated; in the process of the movable rod (8) moving toward the storage chamber (3), the pipe sealing member and the piston (2) are in contact with each other, and the piston (2) and the pipe sealing member are connected to block the return pipe (7); in the process of the movable rod (8) moving toward the return chamber (4), the pipe sealing member and the piston (2) are relatively separated and a communication gap (9) is formed, so that the return pipe (7) can be connected with the return chamber (4) through the communication gap (9); A sliding cavity (10) is provided in the piston (2), and a clamping block (11) is provided at the end of the movable rod (8). The clamping block (11) is slidably arranged in the sliding cavity (10); the sliding of the clamping block (11) in the sliding cavity (10) enables the movable rod (8) and the piston (2) to move relative to each other along the moving direction of the piston (2).

2. A continuous sampling device according to claim 1, characterized in that: The pipe sealing member is a sealing ring (12); the outer ring surface of the sealing ring (12) fits with the inner wall of the sampling tube (1), so that the sealing ring (12) can seal the return pipe (7); the sealing ring (12) is fixed to the movable rod (8) through a hollow bracket structure, so that the formed communication gap (9) can be connected to the return chamber (4).

3. A continuous sampling device according to claim 1, characterized in that: A limiting structure for preventing the clamping block (11) from detaching is provided in the sliding cavity (10).

4. A continuous sampling device according to claim 3, characterized in that: The return cavity (4) is provided with a discharge port (13), which is unidirectional and can squeeze out the sample from the discharge port (13) when the return cavity (4) contracts.

5. A continuous sampling device according to claim 4, characterized in that: When the movable rod (8) moves toward the return chamber (4) to the stroke limit, the end of the return pipe (7) connected to the sampling cylinder (1) is still blocked by the piston (2).

6. A continuous sampling device according to claim 5, characterized in that: The piston (2) is provided with a blocking block (14); when the movable rod (8) moves toward the storage chamber (3) to the stroke limit, the pipe sealing member blocks the return pipe (7) and the blocking block (14) blocks the sampling port (5).

7. A continuous sampling device according to claim 6, characterized in that: The return pipe (7) is connected to one end of the sample outlet pipe (6) close to the sampling cylinder (1).

8. The continuous sampling method of the continuous sampling device according to claim 7, characterized in that: The following steps are involved: S1: The movable rod (8) drives the piston (2) to move toward the return chamber (4), so that the sample is sucked into the storage chamber (3) through the sampling port (5); S2: The movable rod (8) drives the piston (2) to move toward the storage chamber (3), so that the sample in the storage chamber (3) is squeezed out from the sample outlet tube (6), and at the same time the return chamber (4) expands and generates negative pressure; S3: The movable rod (8) moves toward the storage chamber (3) to the limit of its travel. At this time, the blocking block (14) blocks the sampling port (5), the sealing member blocks the return pipe (7), and there is residual sample in the sample outlet pipe (6); S4: The movable rod (8) quickly moves toward the return chamber (4) for a distance and then pauses, so that the sealing member and the piston (2) are separated, the return pipe (7) is connected to the return chamber (4), and the residual sample in the sample outlet pipe (6) is sucked into the return chamber (4) under the action of negative pressure; S5: The movable rod (8) continues to move toward the return chamber (4), driving the piston (2) to compress the return chamber (4), so that the sample sucked into the return chamber (4) is squeezed out from the discharge port (13), and at the same time, the storage chamber (3) expands, so that the new sample is sucked into the storage chamber (3) through the sampling port (5), and then steps S2 to S5 are circulated.

9. A continuous sampling method according to claim 8, characterized in that: In step S4, the speed at which the movable rod (8) moves toward the return chamber (4) is greater than the speed at which the piston (2) moves toward the return chamber (4) under the negative pressure of the return chamber (4); and the moving distance of the movable rod (8) is less than the depth of the plugging block (14) inserted into the sampling port (5), so that after the movable rod (8) stops moving, the sampling port (5) is still in a blocked state.

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