Automatic sampler

Abstract

The utility model discloses an automatic sampler which comprises an outer cylinder, an inner cylinder and a driving part fixed at one end of the outer cylinder, and the other end of the outer cylinder is connected with a material container; a feed opening is formed in the bottom of the outer cylinder; the inner cylinder is located in the outer cylinder, and the driving piece drives the inner cylinder to reciprocate in the axial direction of the outer cylinder. The inner cylinder is provided with a sampling cavity, sliding grooves communicated with the sampling cavity and sliding covers in sliding fit with the sliding grooves are arranged above and below the inner cylinder, and the length of the sliding grooves is larger than the axial length of the sampling cavity, so that the sampling cavity is in an opened or closed state; when the sampling cavity is located in the material container, the sliding cover located above the inner cylinder opens the sampling cavity, and the sliding cover located below the inner cylinder closes the sampling cavity; and when the sampling cavity is opposite to the feed opening, the sliding cover positioned above the inner cylinder closes the sampling cavity, and the sliding cover positioned below the inner cylinder opens the sampling cavity. The automatic sampler disclosed by the utility model is simple in structure, convenient to control and capable of meeting the sampling requirements of a material production line.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling, in particular to an automatic sampler. Background Art

[0002] In industries such as cement, coal powder, food and chemicals, quality control tests need to be carried out on products at different stages during the continuous production process, and the production process needs to be adjusted according to the test results to ensure product quality. Therefore, technicians usually need to sample materials at each stage every few hours. The most primitive method is manual sampling, where workers receive a small portion of materials from the product delivery pipeline every few hours and take them back to the laboratory for inspection.

[0003] Manual sampling will inevitably lead to sample differences and may also cause contamination to the samples, which can no longer meet the needs of modern production. Automatic sampling structures have gradually replaced manual sampling work, but the samplers in the prior art have many problems, such as complex structure, easy adhesion of materials in the sampling cavity, and specific requirements for the flow direction of materials (for example, only applicable to horizontally placed conveying pipelines).

[0004] Therefore, it is necessary to design an automatic sampler which has a simple structure and is suitable for large-scale reaction equipment, material storage silos or vertically installed pipelines. Utility Model Content

[0005] In order to solve the technical problems of the sampler in the prior art, such as the complex structure, easy adhesion of materials in the sampling cavity and specific requirements on the flow direction of materials, the utility model provides an automatic sampler to solve the above problems.

[0006] The technical solution adopted by the utility model to solve its technical problems is: an automatic sampler, comprising an outer cylinder, an inner cylinder and a driving member fixed at one end of the outer cylinder, the other end of the outer cylinder is connected to a material holding container; a feeding port is provided at the bottom of the outer cylinder; the inner cylinder is located in the outer cylinder, and the driving member drives the inner cylinder to reciprocate along the axial direction of the outer cylinder; the inner cylinder has a sampling cavity, and the upper and lower parts of the inner cylinder are both provided with a slide groove connected to the sampling cavity and a slide cover slidably matched with the slide groove, and the length of the slide groove is greater than the axial length of the sampling cavity, so that the sampling cavity is in an open or closed state; when the sampling cavity is located in the material holding container, the slide cover located above the inner cylinder opens the sampling cavity, and the slide cover located below the inner cylinder closes the sampling cavity; when the sampling cavity is directly opposite to the feeding port, the slide cover located above the inner cylinder closes the sampling cavity, and the slide cover located below the inner cylinder opens the sampling cavity.

[0007] Furthermore, the inner cylinder comprises a front plunger, an intermediate tube and a rear plunger which are axially connected in sequence, the driving member is connected to the rear plunger, and the sampling cavity is located in the intermediate tube.

[0008] Furthermore, the length of the sliding cover is slightly greater than the length of the sampling cavity, and when the sampling cavity is in an open state, the sliding cover is located on the front plunger or the rear plunger.

[0009] Furthermore, the sliding cover located below the inner cylinder reciprocates between the middle tube and the front plunger; a first limiting groove is provided on the surface of the sliding cover located below the inner cylinder, and a second elastic pin is provided on the inner surface of the outer cylinder. When the sliding cover located below the inner cylinder is in a fully open state, the sampling cavity is opposite to the discharge port, and the second elastic pin is inserted into the first limiting groove.

[0010] Furthermore, the sliding cover located above the inner cylinder reciprocates between the intermediate tube and the rear plunger; a second limiting groove is provided on the surface of the sliding cover located above the inner cylinder, and a third elastic pin is provided on the inner surface of the outer cylinder. When the sliding cover located above the inner cylinder is in a fully open state, the sampling cavity extends out of the outer cylinder, and the third elastic pin is inserted into the second limiting groove.

[0011] Furthermore, a first elastic pin is provided on the inner bottom surface of the slide groove below the inner cylinder. When the sliding cover below the inner cylinder closes the sampling cavity, the first elastic pin extends and the sliding cover is located between the first elastic pin and the end surface of the slide groove.

[0012] Furthermore, the matching surface between the slide groove and the slide cover is a wedge-shaped surface.

[0013] Furthermore, the driving member is a pneumatic cylinder or an oil cylinder.

[0014] Furthermore, the material holding container has a sampling port connected to the end of the outer tube, and when the sampling cavity is directly opposite to the discharge port, the end surface of the inner tube facing the material holding container is aligned with the inner surface of the material holding container.

[0015] Furthermore, the second elastic pin includes a spring and a column pin, one end of the spring is connected to the outer tube, and the other end is connected to the column pin, the inner surface of the outer tube has a receiving groove, when the second elastic pin is in a contracted state, the pin is located in the receiving groove, when the second elastic pin is in a free state, the pin extends out of the receiving groove.

[0016] The beneficial effects of the utility model are:

[0017] (1) The automatic sampler described in the utility model has a simple structure, is easy to control, and can meet the sampling needs of material production lines.

[0018] (2) The utility model can realize fully automatic quantitative sampling while achieving good sealing without affecting the flow of materials in the material container. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1It is a schematic diagram of the automatic sampler of the utility model in a feeding state;

[0021] Figure 2 It is a schematic diagram of the automatic sampler of the utility model in a sampling state;

[0022] Figure 3 It is a schematic diagram of the axial section of the inner cylinder in the utility model;

[0023] Figure 4 It is the front view of the inner cylinder in the utility model;

[0024] Figure 5 yes Figure 4 AA section view;

[0025] Figure 6 It is a schematic diagram of the elastic pin in the utility model when it is in a free state;

[0026] Figure 7 It is a schematic diagram of the elastic pin in the utility model when it is in a contracted state.

[0027] In the figure, 1, outer cylinder, 101, feeding port, 2, inner cylinder, 201, front plunger, 202, middle tube, 203, rear plunger, 3, driving member, 4, material holding container, 401, sampling port, 5, sampling cavity, 6, upper sliding cover, 601, second limiting groove, 7, lower sliding cover, 701, first limiting groove, 8, upper sliding groove, 9, lower sliding groove, 10, third elastic pin, 11, second elastic pin, 12, first elastic pin, 13, spring, 14, column pin, 15, receiving groove. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] Embodiment 1

[0030] like Figure 1-Figure 3As shown, an automatic sampler comprises an outer cylinder 1, an inner cylinder 2 and a driving member 3. The axial ends of the outer cylinder 1 are connected, one end of the outer cylinder 1 is connected to the driving member 3, and the other end is connected to the material container 4; a discharge port 101 is provided at the bottom of the outer cylinder 1, and the discharge port 101 is connected to the lower equipment, and the sample material in the sampling cavity 5 falls into the lower equipment from the discharge port 101; the inner cylinder 2 is located in the outer cylinder 1, and the driving member 3 drives the inner cylinder 2 to reciprocate along the axial direction of the outer cylinder 1, thereby driving the inner cylinder 2 to extend out of the outer cylinder 1 or retract into the outer cylinder 1; the inner cylinder 2 has The sampling cavity 5 has a slide groove connected to the sampling cavity 5 and a slide cover slidably matched with the slide groove above and below the inner cylinder 2, and the length of the slide groove is greater than the axial length of the sampling cavity 5, so that the sampling cavity 5 is in an open or closed state; when the sampling cavity 5 is located in the material holding container 4, the slide cover located above the inner cylinder 2 opens the sampling cavity 5, and the slide cover located below the inner cylinder 2 closes the sampling cavity 5; when the sampling cavity 5 is directly opposite to the discharge port 101, the slide cover located above the inner cylinder 2 closes the sampling cavity 5, and the slide cover located below the inner cylinder 2 opens the sampling cavity 5.

[0031] The orientation term in the present invention refers to the orientation of each component when the automatic sampler is in working state. For the convenience of description, the present invention names the chute and the slide cover located above the inner tube 2 as the upper chute 8 and the upper slide cover 6, respectively, and names the chute and the slide cover located below the inner tube 2 as the lower chute 9 and the lower slide cover 7, respectively. The upper slide cover 6 reciprocates in the upper chute 8, so that the upper opening of the sampling chamber 5 is opened when it is in the material container 4 for receiving materials, and is closed when it is in the outer tube 1 to prevent the sample from floating upward; the lower slide cover 7 reciprocates in the lower chute 9, so that the lower opening of the sampling chamber 5 is closed when it is in the material container 4, and is opened when it is in the outer tube 1 for communicating with the discharge port 101.

[0032] The inner cylinder 2 has the same shape as the outer cylinder 1, and the walls of the two cylinders fit together. The outer cylinder 1 and the inner cylinder 2 may be prismatic structures. In this embodiment, the outer cylinder 1 and the inner cylinder 2 are cylindrical structures. The driving member 3 may be an air cylinder or an oil cylinder.

[0033] Assuming that the inner cylinder 2 extends in the forward direction, the inner cylinder 2 includes a front plunger 201, an intermediate tube 202 and a rear plunger 203 which are connected in sequence in the axial direction, the driving member 3 is connected to the rear plunger 203, and the sampling chamber 5 is located in the intermediate tube 202. The front plunger 201 and the rear plunger 203 are both solid structures, and the intermediate tube 202 is a hollow tubular structure (such as Figure 3 As shown), the hollow part in the center of the middle tube 202 forms the sampling cavity 5, so the axial length of the middle tube 202 is the axial length of the sampling cavity 5, and the length of the slide groove must be greater than the length of the middle tube 202.

[0034] Preferably, the length of the sliding cover is slightly greater than the length of the sampling chamber 5, which means that the length of the sliding cover is approximately equal to the length of the sampling chamber 5 and is not less than the length of the sampling chamber 5. When the sampling chamber 5 is in an open state, the sliding cover is located on the front plunger 201 or the rear plunger 203, that is, the slide groove extends from one end of the intermediate tube 202 to the other end and extends to the front plunger 201 or the rear plunger 203. When the sliding cover is located at one end of the slide groove, the sliding cover just blocks the opening of the sampling chamber 5, and when the sliding cover is located at the other end of the slide groove, the sliding cover just completely opens the opening of the sampling chamber 5.

[0035] The upper sliding cover 6 and the lower sliding cover 7 can be driven to reciprocate by electric means. In order to reduce the cost, the utility model adopts mechanical means to drive the upper sliding cover 6 and the lower sliding cover 7 to reciprocate. The specific structure is as follows:

[0036] The upper slide cover 6 reciprocates between the intermediate tube 202 and the rear plunger 203; a second limiting groove 601 is provided on the surface of the upper slide cover 6, and a third elastic pin 10 is provided on the inner surface of the outer tube 1. When the upper slide cover 6 is in a fully opened state, the sampling cavity 5 extends out of the outer tube 1, and the third elastic pin 10 is inserted into the second limiting groove 601. Figure 2 As shown, during sampling, the upper sliding cover 6 is located at the rightmost end of the upper sliding groove 8 and is on the rear plunger 203. The upper opening of the sampling chamber 5 is opened. At this time, the third elastic pin 10 is inserted into the second limiting groove 601. After the sampling is completed, the driving member 3 drives the inner cylinder 2 to move to the right. Under the restriction of the third elastic pin 10, the upper sliding cover 6 slides along the upper sliding groove 8 until the upper sliding cover 6 and the left end of the upper sliding groove 8 are abutted. At this time, the upper sliding cover 6 closes the upper opening of the sampling chamber 5 and cannot slide relative to the upper sliding groove 8. Under the action of the lateral thrust, the third elastic pin 10 contracts, thereby causing the third elastic pin 10 to disengage from the second limiting groove 601. At this time, the upper sliding cover 6 is driven by the inner cylinder 2 to move to the right until it reaches Figure 1 On the contrary, when sampling is required, the driving member 3 drives the inner cylinder 2 to extend, and when the second limiting groove 601 reaches the third elastic pin 10, the third elastic pin 10 is inserted into the second limiting groove 601, and the upper slide cover 6 stops moving and slides relative to the upper slide groove 8 until the sampling chamber 5 is fully extended and the upper slide cover 6 reaches the right end of the upper slide groove 8, as shown in FIG. Figure 2 shown.

[0037] As for the lower slide cover 7, the lower slide cover 7 reciprocates between the middle tube 202 and the front plunger 201; the surface of the lower slide cover 7 is provided with a first limiting groove 701, and the inner surface of the outer tube 1 is provided with a second elastic pin 11. When the lower slide cover 7 is in a fully opened state, the sampling cavity 5 is directly opposite to the feed port 101, and the second elastic pin 11 is inserted into the first limiting groove 701. Figure 2As shown, during sampling, the lower slide cover 7 is located at the rightmost end of the lower slide groove 9 and is on the front plunger 201, and the lower opening of the sampling chamber 5 is closed. At this time, the lower slide cover 7 is outside the outer cylinder 1. After sampling, the driving member 3 drives the inner cylinder 2 to move to the right. Under ideal circumstances, the lower slide cover 7 will not move relative to the inner cylinder 2 due to friction, and the lower slide cover 7 moves synchronously with the inner cylinder 2. When the first limiting groove 701 reaches the second elastic pin 11, the second elastic pin 11 is inserted into the first limiting groove 701, and the lower slide cover 7 no longer moves. The lower slide cover 7 slides along the lower slide groove 9, and the opening below the sampling chamber 5 gradually opens until the lower slide cover 7 abuts against the left end of the lower slide groove 9. At this time, the lower slide cover 7 completely opens the opening below the sampling chamber 5, and the opening below the sampling chamber 5 is directly opposite to the discharge port 101, as shown in FIG. Figure 1 On the contrary, when sampling is required, the driving member 3 drives the inner cylinder 2 to extend, and under the restriction of the second elastic pin 11, the lower cover 7 remains stationary, and the lower cover 7 gradually shifts to the right of the lower groove 9 to close the lower opening of the sampling chamber 5, until the lower cover 7 reaches the rightmost end of the lower groove 9, and the lower opening of the sampling chamber 5 is completely closed. Figure 2 Status shown.

[0038] The matching surface between the slide groove and the slide cover is preferably a wedge-shaped surface (such as Figure 5 to prevent the slide cover from falling out of the slide slot.

[0039] Embodiment 2

[0040] In the first embodiment, after sampling is completed, when the inner cylinder 2 moves inward, the lower slide cover 7 may move relative to the lower slide groove 9 in advance due to the friction of the inner wall of the outer cylinder 1, causing the lower opening of the sampling cavity 5 to open in advance before reaching the discharge port 101, causing material leakage. Therefore, the present embodiment is improved as follows:

[0041] The bottom surface of the lower slide groove 9 is provided with a first elastic pin 12. When the lower slide cover 7 closes the sampling chamber 5, the first elastic pin 12 extends out, and the lower slide cover 7 is located between the first elastic pin 12 and the end surface of the lower slide groove 9. Figure 2 As shown, the first elastic pin 12 abuts against the left end of the lower sliding cover 7, and the right end of the lower sliding cover 7 abuts against the right end surface of the lower sliding groove 9. When the inner cylinder 2 moves inward, under the action of the first elastic pin 12, the lower sliding cover 7 will not move relative to the inner cylinder 2 until the lower sliding cover 7 reaches the front of the discharge port 101. At this time, the second elastic pin 11 is inserted into the first limiting groove 701, and the lower sliding cover 7 overcomes the elastic force of the first elastic pin 12 and deviates to the left end of the downward sliding groove 9.

[0042] The first elastic column, the second elastic column and the third elastic column have the same structure. Taking the second elastic column as an example, the second elastic pin 11 includes a spring 13 and a column pin 14. One end of the spring 13 is connected to the outer cylinder 1, and the other end is connected to the column pin 14. The inner surface of the outer cylinder 1 has a receiving groove 15. When the second elastic pin 11 is in a contracted state, Figure 7As shown, the pin is located in the receiving groove 15. When the second elastic pin 11 is in a free state, as shown in FIG. Figure 6 As shown, the pin extends out of the receiving groove 15. To prevent the second elastic column from bending when extending, the pin 14 is still partially located in the receiving groove 15 in the free state.

[0043] In a further design, the material holding container 4 has a sampling port 401 connected to the end of the outer cylinder 1. When the sampling cavity 5 is facing the discharge port 101, the end surface of the inner cylinder 2 facing the material holding container 4 is aligned with the inner surface of the material holding container 4, thereby playing the role of a sealed container, which does not affect the normal discharge of the material holding container 4 and also ensures that the sampling process is completely sealed.

[0044] Working principle introduction:

[0045] During operation, the front flange of the outer cylinder 1 is mounted on the sampling port 401 of the material container 4. At this time, the front plunger 201 of the inner cylinder 2 seals the sampling port 401. The sampling cavity 5 is located above the material discharge port 101. The upper slider covers the upper part of the sampling cavity 5. The lower slide cover 7 is located on the left side of the lower slide groove 9. The second elastic pin 11 pops out and is embedded in the first limiting groove 701 of the lower slide cover 7 to position the lower slide cover 7. At this time, the sampling cavity 5 is in a material discharge state, as shown in FIG. Figure 1 shown.

[0046] During sampling, the driving member 3 pushes the inner cylinder 2 to move outward, and the lower slide cover 7 remains stationary due to the action of the second elastic pin 11. When the sampling chamber 5 moves to the top of the lower slide cover 7, the right side of the lower slide cover 7 contacts the right end of the lower slide groove 9, and then, under the push of the inner cylinder 2, it breaks away from the restriction of the second elastic pin 11 and moves with the inner cylinder 2. At this time, the first elastic pin 12 on the front plunger 201 pops out to restrict the lower slide cover 7 to the bottom of the sampling chamber 5. When the second limiting groove 601 of the upper slide cover 6 moves to the bottom of the third elastic pin 10, the third elastic pin 10 pops out to position the upper slide cover 6. As the inner cylinder 2 continues to move outward, the upper slide cover 6 gradually moves to the right side of the upper slide groove 8, the sampling port of the sampling chamber 5 opens, and the material enters the sampling chamber 5 to complete the sampling. Figure 2 shown.

[0047] Subsequently, the driving member 3 drives the inner cylinder 2 to retract, and the upper slide cover 6 remains motionless under the action of the third elastic pin 10. As the inner cylinder 2 moves into the outer cylinder 1, the upper slide cover 6 gradually slides to the top of the sampling chamber 5 and scrapes out the sample beyond the sampling chamber 5. When the left side of the upper slide cover 6 contacts the left end of the upper slide groove 8, the upper slide cover 6 just completely covers the sampling chamber 5. Subsequently, under the action of the inner cylinder 2, the upper slide cover 6 breaks away from the limit of the third elastic pin 10 and begins to move with the inner cylinder 2. When the right side of the sampling chamber 5 reaches the top of the discharge port 101, the first limit groove 701 of the lower slide cover 7 just reaches the position of the second elastic pin 11, and the second elastic pin 11 pops out and enters the first limit groove 701, preventing the lower slide cover 7 from continuing to move. As the inner cylinder 2 continues to move into the outer cylinder 1, the lower slide cover 7 gradually breaks away from the bottom of the sampling chamber 5, and the bottom of the sampling chamber 5 is opened. The sample enters the discharge port 101 and is collected, completing the entire sampling process. At this time, the front plunger 201 is located at the sampling port 401, sealing the sampling port 401 of the material holding cavity, and waiting for the next sampling command.

[0048] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "axial", etc., indicating orientations or positional relationships, are 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 device or element referred to 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.

[0049] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0050] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0051] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An automatic sampler, characterized in that: The invention comprises an outer cylinder (1), an inner cylinder (2) and a driving member (3) fixed to one end of the outer cylinder (1); the other end of the outer cylinder (1) is connected to a material container (4); a material discharge port (101) is provided at the bottom of the outer cylinder (1); The inner cylinder (2) is located in the outer cylinder (1), and the driving member (3) drives the inner cylinder (2) to reciprocate along the axial direction of the outer cylinder (1); the inner cylinder (2) has a sampling cavity (5), and the upper and lower parts of the inner cylinder (2) are both provided with a slide groove connected to the sampling cavity (5) and a slide cover slidably matched with the slide groove, and the length of the slide groove is greater than the axial length of the sampling cavity (5), so that the sampling cavity (5) is in an open or closed state; when the sampling cavity (5) is located in the material container (4), the slide cover located above the inner cylinder (2) opens the sampling cavity (5), and the slide cover located below the inner cylinder (2) closes the sampling cavity (5); when the sampling cavity (5) is directly opposite to the discharge port (101), the slide cover located above the inner cylinder (2) closes the sampling cavity (5), and the slide cover located below the inner cylinder (2) opens the sampling cavity (5).

2. The automatic sampler according to claim 1, characterized in that: The inner cylinder (2) comprises a front plunger (201), an intermediate tube (202) and a rear plunger (203) which are axially connected in sequence, the driving member (3) is connected to the rear plunger (203), and the sampling chamber (5) is located in the intermediate tube (202).

3. The automatic sampler according to claim 1, characterized in that: The length of the sliding cover is slightly greater than the length of the sampling cavity (5); when the sampling cavity (5) is in an open state, the sliding cover is located on the front plunger (201) or the rear plunger (203).

4. The automatic sampler according to claim 2, characterized in that: The sliding cover located below the inner cylinder (2) reciprocates between the intermediate tube (202) and the front plunger (201); A first limiting groove (701) is provided on the surface of the sliding cover below the inner cylinder (2), and a second elastic pin (11) is provided on the inner surface of the outer cylinder (1). When the sliding cover below the inner cylinder (2) is in a fully opened state, the sampling cavity (5) is directly opposite to the discharge port (101), and the second elastic pin (11) is inserted into the first limiting groove (701).

5. The automatic sampler according to claim 4, characterized in that: The sliding cover located above the inner cylinder (2) reciprocates between the intermediate tube (202) and the rear plunger (203); A second limiting groove (601) is provided on the surface of the sliding cover located above the inner cylinder (2), and a third elastic pin (10) is provided on the inner surface of the outer cylinder (1). When the sliding cover located above the inner cylinder (2) is in a fully opened state, the sampling cavity (5) extends out of the outer cylinder (1), and the third elastic pin (10) is inserted into the second limiting groove (601).

6. The automatic sampler according to claim 4, characterized in that: A first elastic pin (12) is provided on the inner bottom surface of the chute below the inner cylinder (2); when the sliding cover below the inner cylinder (2) closes the sampling cavity (5), the first elastic pin (12) extends and the sliding cover is located between the first elastic pin (12) and the end surface of the chute.

7. The automatic sampler according to claim 4, characterized in that: The second elastic pin (11) comprises a spring (13) and a pin (14); one end of the spring (13) is connected to the outer tube (1), and the other end is connected to the pin (14); the inner surface of the outer tube (1) has a receiving groove (15); when the second elastic pin (11) is in a contracted state, the pin is located in the receiving groove (15); when the second elastic pin (11) is in a free state, the pin extends out of the receiving groove (15).

8. The automatic sampler according to claim 1, characterized in that: The matching surface between the slide groove and the slide cover is a wedge-shaped surface.

9. The automatic sampler according to claim 1, characterized in that: The driving member (3) is a pneumatic cylinder or an oil cylinder.

10. The automatic sampler according to claim 1, characterized in that: The material container (4) has a sampling port (401) connected to the end of the outer cylinder (1), and when the sampling cavity (5) is facing the discharge port (101), the end surface of the inner cylinder (2) facing the material container (4) is aligned with the inner surface of the material container (4).

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