Automatic sampling device suitable for air conveying chute

Abstract

The invention relates to an automatic sampling device suitable for an air conveying chute, which can realize scientific and efficient sampling work on the air conveying chute, is large in sampling amount, simple in structure and convenient to install, does not need manual participation, and can ensure the original leakproofness of the air conveying chute. The sampling frequency and the sampling time of the device can be controlled through the PLC system, and the blowing device is arranged, so that the inside of the sampling pipe can be blown and cleaned regularly, and the sampling representativeness is effectively ensured.

Description

Technical Field

[0001] The present invention relates to an on-line material sampling device, and particularly to an automatic sampling device for an air-slide conveyor. Background Art

[0002] Inside the air-slide conveyor, the trough body is divided into an upper trough body and a lower trough body by a breathable layer (5). Gas with a certain pressure flows through the lower trough body, and the gas passes through the micropores of the breathable layer (5) and enters the upper trough body, causing the powder in the upper trough body to flow in a suspended state in the inclined direction of the trough. If sampling work is to be carried out on the air-slide conveyor, the internal air pressure of the trough cannot be damaged, and the original airtightness of the trough body needs to be ensured. Common sampling devices such as spiral type, flap type, and telescopic type will all damage the airtightness of the trough body and affect the conveying efficiency of the powder, and none of them can achieve scientific and efficient sampling work on the air-slide conveyor. Summary of the Invention

[0003] The present invention is an automatic sampling device applicable to an air-slide conveyor. The device has a large sampling volume, a simple structure, is convenient to install, does not require manual participation, can ensure the original airtightness of the trough, can achieve scientific and efficient sampling work on the air-slide conveyor, can control the sampling frequency and sampling time of the device through a PLC control system, and its provided blowing device (7) can periodically blow and clean the inside of the sampling pipe (4), effectively ensuring the sampling representativeness.

[0004] The technical solution adopted by the present invention is as follows: An automatic sampling device applicable to an air slide, characterized in that it includes a PLC control system (1), a motor (2), a housing (3), a sampling tube (4), a feed pipe (6), a jetting device (7), and a gate valve (8); openings are made at the top, bottom, and the breathable layer (5) of the air slide and are on the same axis. The motor (2) is fixed to the top of the housing (3), and the sampling tube (4) is placed inside the housing (3) and connected to the motor (2); the housing (3) is inserted and fixed through the opening above the air slide, and the feed pipe (6) extends into and is fixed to the housing (3) after docking with the opening at the bottom of the air slide; thus, the installation of the entire sampling device is completed. The motor (2) can drive the sampling tube (4) to rotate inside the housing (3). The sampling tube (4) and the housing (3) have openings on the side walls. After the sampling tube (4) rotates, the openings of the two can be in a coincident state or a non-intersecting and non-overlapping state; when the openings of the two coincide, it is the sampling state, and when the openings of the two have no intersection and do not overlap, it is the non-sampling state. The opening height is greater than the thickness of the material layer to achieve full-section sampling; through the PLC control system (1), the amplitude, frequency, and time of the motor (2) driving the sampling tube (4) to rotate inside the housing (3) can be controlled; after the feed pipe (6) is docked with the housing (3) and clamps the breathable layer (5), it is fixed, ensuring the original airtightness of the breathable layer (5), so that the air pressure in the lower chute of the air slide does not change after the installation of the device; a gate valve (8) is provided on the feed pipe (6) to ensure the original airtightness of the air slide. A jetting device is provided above the gate valve (8), which can effectively clean the residual material sample in the sampling tube (4) and ensure the representativeness of the sampling.

[0005] Advantages of the present invention: The present invention has a simple structure, is easy to install, and operates stably. While sampling on the air slide, it ensures its original airtightness and does not affect the material conveying efficiency of the air slide.

[0006] The present invention can control the sampling frequency and sampling time of the device through the PLC control system, without the need for manual participation, and realizes fully automatic sampling work.

[0007] The present invention is provided with a jetting device (7), which can perform jetting and cleaning work on the inside of the sampling tube (4) regularly through the PLC control system, effectively ensuring the representativeness of the sampling.

[0008] The present invention has a large sampling volume, and the size of the feed inlet during sampling can be controlled by controlling the rotation angle of the motor (2) driving the sampling tube (4), realizing the controllability of the feeding efficiency and meeting the use requirements of various analytical instruments.

[0009] The opening height of the housing (3) and the sampling tube (4) of the present invention can cover the thickness of the material layer in the air slide, realizing full-section sampling work on the air slide, and the collected samples are more representative. Description of the Drawings

[0010] Figure 1 It is a structural sectional view of an automatic sampling device applicable to an air slide in the sampling state; Figure 2 It is Figure 1 sectional view of; Figure 3 It is a structural sectional view of an automatic sampling device applicable to an air slide in the closed state; Figure 4 It is Figure 3 sectional view of; In the figure: 1. PLC control system, 2. motor, 3. housing, 4. sampling pipe, 5. breathable layer, 6. blanking pipe, 7. jetting device, 8. gate valve; Detailed Implementation Manner

[0011] An automatic sampling device applicable to an air slide, its mechanism is as Figure 1 shown. It includes a PLC control system (1), a motor (2), a housing (3), a sampling pipe (4), a blanking pipe (6), a jetting device (7), a gate valve (8), and a PLC control system (1); openings are made at the top, bottom, and breathable layer (5) of the air slide and are on the same axis. The motor (2) is fixed to the top of the housing (3), and the sampling pipe (4) is placed inside the housing (3) and connected to the motor (2); the housing (3) is inserted and fixed through the opening above the air slide, and the blanking pipe (6) extends from the bottom of the air slide and is fixed after being docked with the housing (3); thus, the installation of the entire sampling device is completed.

[0012] During non-sampling time, the opening of the sampling pipe (4) does not overlap with the opening of the housing (3), and the gate valve (8) is closed, so the materials inside the air slide cannot enter the sampling pipe (4); when sampling work needs to be carried out, the PLC control system issues an instruction, and the motor (2) drives the sampling pipe (4) to rotate until its opening coincides with the opening of the housing (3), and the materials enter the sampling pipe (4) through the opening; after the sample collection is completed, the motor (2) drives the sampling pipe (4) to rotate to a position where its opening has no intersection and does not overlap with the opening of the housing (3), so that the inside of the sampling pipe (4) is isolated from the air slide; then the gate valve (8) is opened, the powder flows out through the blanking pipe (6), the jetting device (7) is started, and the inside of the device is cleaned. After the cleaning work is completed, the gate valve (8) is closed, thus completing the entire sampling process.

Claims

1. An automatic sampling device applicable to an air-slide conveyor, characterized in that: it includes a PLC control system (1), a motor (2), a housing (3), a sampling pipe (4), a feeding pipe (6), a jetting device (7), and a gate valve (8); openings are made at the top, bottom, and breathable layer (5) of the air-slide conveyor and are on the same axis. The motor (2) is fixed to the top of the housing (3), and the sampling pipe (4) is placed inside the housing (3) and connected to the motor (2); the housing (3) is inserted and fixed through the opening above the chute, and the feeding pipe (6) extends from the bottom of the chute and is fixed after being docked with the housing (3).

2. The automatic sampling device applicable to an air-slide conveyor according to claim 1, characterized in that: the motor (2) can drive the sampling pipe (4) to rotate inside the housing (3). The sampling pipe (4) and the housing (3) have openings on the side walls. After the sampling pipe (4) rotates, the openings of the two can be in a coincident state, and the opening height is greater than the thickness of the material layer to achieve full-section sampling.

3. The automatic sampling device applicable to an air-slide conveyor according to claim 1, characterized in that: the PLC control system (1) can control the amplitude, frequency, and time of the motor (2) driving the sampling pipe (4) to rotate inside the housing (3).

4. The automatic sampling device applicable to an air-slide conveyor according to claim 1, characterized in that: the feeding pipe (6) is fixed after being docked with the housing (3) to clamp the breathable layer (5), ensuring the original airtightness of the breathable layer (5).

5. The automatic sampling device applicable to an air-slide conveyor according to claim 1, characterized in that: the feeding pipe (6) is provided with a gate valve (8) to ensure the original airtightness of the air-slide conveyor. A jetting device (7) is provided above the gate valve (8), which can effectively clean the residual material sample in the sampling pipe (4) and ensure the representativeness of the sampling.

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