Sample introduction mechanism, sample adding device and sample adding method of automatic element analyzer

Abstract

The invention discloses a sample injection mechanism, a sample injection device and a sample injection method of an automatic element analyzer. The sample injection mechanism comprises a clamping assembly, an oxygen supply pipe and a sample falling head, a sample feeding hole for feeding a sample is formed in the top of the sample falling head, a sample falling hole for falling the sample is formed in the bottom of the sample falling head, the clamping assembly is arranged in the sample falling head in a sealing manner and can open or close the sample feeding hole and the sample falling hole, and the sample falling head is communicated with the oxygen supply pipe. According to the sample introduction mechanism, a traditional sample introduction structure is changed into a sample introduction structure in which the clamping assembly is matched with the sample falling head, so that the problem of sample clamping caused by a gap when the existing sample introduction mechanism is sealed is avoided, the traditional sample introduction structure is further simplified, a cavity above the combustion tube is further reduced, and the purging difficulty is reduced. And in the sample adding device, a sample injection mechanism, a combustion device and a crucible are integrated into an integrated structure, so that the occupied space of the sample adding device is effectively reduced, the integration degree of the sample adding device is improved, and convenience is provided for the robot to automatically replace the crucible.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of elemental analysis instrument, more particularly, to an automatic elemental analysis instrument sample feeding mechanism, a sample feeding device and a sample feeding method thereof. BACKGROUND

[0002] The elemental analysis instrument refers to an instrument for simultaneously or individually analyzing several elements in a sample. The sample feeding structure in the present application includes but is not limited to elemental analysis instruments for C, H, N, etc. Taking the C, H, N elemental analysis instrument as an example, the sample (referring to the sample wrapped by a tin capsule, tin cup, etc. after being crushed) cannot be directly dropped into the combustion furnace for combustion from the sample drop port, otherwise air will enter the furnace with the sample, and CO2, H2O and N2 in the air will affect the test results of C, H and N elements in the sample, respectively. In order to avoid the influence of air on the test results, the sample is usually caught by a furnace door plug before it falls into the combustion furnace, then the sample feeding port is closed to isolate the outside air, and high-purity oxygen is used to purge the sample and the furnace, etc. to clean the air. In recent years, more and more elemental analysis instruments are applied in robot analysis, and the existing elemental analysis instrument sample feeding often has the following problems: 1. The sample feeding opening and closing assembly or the sliding block assembly has a flat sealing structure, there is relative movement and a large gap between the two sealing planes, and when the sample is packaged by a robot, the sample is easy to be stuck; 2. The existing sample feeding mechanism uses a furnace door plug (or a furnace door baffle) to catch the sample, and when the sample is blocked after falling, it cannot fall when the furnace door plug (or the furnace door baffle) is opened, and there is no other structure to contact the sample to make the sample fall, which needs manual intervention; 3. The existing sample feeding mechanism has a complex structure, there is a large air hiding space above the combustion pipe, and it is difficult to clean the oxygen, which takes a long time; 4. The existing sample feeding mechanism has a complex structure, and it is difficult to realize automatic replacement of the crucible by the robot.

[0003] Therefore, there is an urgent need for an automatic sample feeding mechanism of an elemental analysis instrument that is more suitable for robot analysis. SUMMARY

[0004] The present application provides an automatic elemental analysis instrument sample feeding mechanism, a sample feeding device and a sample feeding method thereof, which changes the sample feeding structure to avoid the problem of sample sticking caused by the gap when the sample feeding opening and closing assembly or the sliding block assembly of the existing sample feeding mechanism is sealed, and replaces the furnace door plug (or the furnace door baffle) structure by simulating the way of clamping the sample by the mechanical hand with the left clamping sliding block and the right clamping sliding block, which not only improves the problem of sample sticking, but also further simplifies the traditional sample feeding structure, reduces the cavity above the combustion pipe, reduces the difficulty of purging, and integrates the combustion oxygen supply assembly into the sample feeding mechanism. There is only one integrated structure above the combustion pipe, which provides convenience for the robot to automatically replace the crucible.

[0005] The technical scheme adopted by the present application to solve its technical problems is an automatic element analyzer sample inlet mechanism, a sample adding device and a sample adding method thereof, the sample inlet mechanism of the automatic element analyzer is used for automatic sample adding of the element analyzer, and the automatic element analyzer sample inlet mechanism comprises a clamping assembly, an oxygen supply pipe and a sample dropping head.

[0006] A sample inlet hole for sample adding is formed in the top of the sample dropping head, a sample dropping hole for sample dropping is formed in the bottom of the sample dropping head, the sample inlet hole and the sample dropping hole are arranged in a staggered manner, the clamping assembly is sealingly arranged in the sample dropping head and can open or close the sample inlet hole and the sample dropping hole, and the sample dropping head is in communication with the oxygen supply pipe.

[0007] Preferably, the clamping assembly comprises a left clamping driving member, a left clamping sliding block, a right clamping driving member, a right clamping sliding block and a sealing ring.

[0008] The left clamping sliding block and the right clamping sliding block are slidingly arranged in the sample dropping head, the left clamping driving member and the right clamping driving member are respectively arranged on the two ends outside the sample dropping head, the sealing ring is sealingly arranged in the sample dropping head, one end of the left clamping sliding block penetrates through the sealing ring to connect the left clamping driving member, and the output end of the right clamping driving member penetrates through the sample dropping head to connect the right clamping sliding block, the left clamping sliding block can open or close the sample inlet hole, and the right clamping sliding block can open or close the sample dropping hole.

[0009] Preferably, the left clamping sliding block comprises a left sliding block and a connecting rod, the left sliding block is slidingly arranged in the sample dropping head and has a width greater than the diameter of the sample inlet hole, one end of the connecting rod penetrates through the sealing ring to be connected with the output end of the left clamping driving member, and the connecting rod is integrally formed with the left sliding block.

[0010] Preferably, the right clamping driving member comprises a spring, a right driving cylinder and a push rod, the right driving cylinder is arranged on the end outside the sample dropping head, the output end of the right driving cylinder is connected with the push rod, one end of the spring is connected with the right driving cylinder, the other end of the spring is connected with the push rod, and the push rod is connected with the right clamping sliding block to push the right clamping sliding block to close the sample dropping hole.

[0011] Preferably, the sample dropping head is provided with a plurality of gas blowing port pipe joints, the gas blowing port pipe joints can all introduce oxygen to supply and blow oxygen in the cavity, and the sample dropping head is further provided with an oxygen supply pipe joint in communication with the oxygen supply pipe.

[0012] The application also provides an automatic element analyzer sample adding device, which comprises a sample adding mechanism, a mechanical hand, an oxygen source, a combustion tube and a crucible of the automatic element analyzer.

[0013] The sample adding mechanism is arranged on the combustion tube, the crucible is arranged in the combustion tube and below the sample dropping hole of the sample adding mechanism to receive the sample dropped by the sample adding mechanism, the mechanical hand is above the sample adding mechanism and can clamp the sample above the sample adding hole of the sample adding mechanism, and the oxygen source is connected with the blowing port connector and the oxygen supply connector of the sample adding mechanism.

[0014] Further, the application also provides an automatic element analyzer sample adding method, which is implemented according to the automatic element analyzer sample adding device of claim 6 and comprises the following steps.

[0015] S1, initial state: the left clamping driving part of the sample adding mechanism works to drive the left clamping sliding block of the sample adding mechanism to move below the sample adding hole, the left clamping sliding block abuts against the inner wall of the sample dropping head to close the sample adding hole, and the right clamping sliding block abuts against the left clamping sliding block under the action of the spring;

[0016] S2, sample adding: after receiving the sample adding request, the mechanical hand moves to the sample adding hole, the left clamping driving part is retracted to drive the left clamping sliding block to move toward the end of the sample dropping head, at this time, the right clamping sliding block is separated from the left clamping sliding block and moves to the sample dropping hole under the action of the spring to close the sample dropping hole, the mechanical hand is released, and the sample falls into the sample dropping head;

[0017] S3, sample moving: after the sample falls into the sample dropping head, the left clamping driving part works to drive the left clamping sliding block of the sample adding mechanism to move toward the other end of the sample dropping head, drive the sample to abut against the right clamping block, and drive the right clamping block to move to the position where the sample is located at the sample dropping hole, at this time, the left clamping sliding block closes the sample adding hole;

[0018] S4, sample purging: when the left clamping sliding block and the right clamping sliding block clamp the sample above the sample dropping hole, oxygen is introduced into the blowing port connector of the sample dropping head to purge the cavity in the sample dropping head to discharge the air entering during the sample dropping;

[0019] S5, sample dropping: after the oxygen purging is completed, the right clamping driving part intermittently drives the right clamping sliding block, and the right clamping sliding block linearly reciprocates to make the sample fall from the sample dropping hole of the sample dropping head;

[0020] S6, after the sample falls into the crucible, oxygen is introduced into the oxygen supply pipe through the oxygen supply pipe joint, so that oxygen reaches the crucible through the oxygen supply pipe, and oxygen is provided for sample combustion.

[0021] Preferably, the left clamping drive and the right clamping drive each comprise a gas cylinder and a nitrogen source; the gas cylinder is in communication with the nitrogen source to drive the reciprocating movement of the output end of the gas cylinder.

[0022] Preferably, the maximum stroke of the left clamping drive is not less than the distance between the left side of the sample dropping hole and the left end of the sample dropping head.

[0023] The beneficial effects of the present application are:

[0024] The automatic elemental analyzer sample inlet mechanism and the sample adding device of the present application change the traditional furnace door plug structure into a sample inlet structure matched with the sample dropping head through the clamping assembly, so that the sample is clamped to the clamping assembly, and the sample dropping is realized through the clamping and loosening of the clamping assembly, thereby avoiding the sample jamming problem caused by the gap of the face seal of the existing sample inlet mechanism opening and closing assembly or slider assembly, and the sample is taken in the way of simulating the mechanical hand clamping sample through the left clamping slider and the right clamping slider, replacing the furnace door plug (or furnace door baffle) structure, which not only improves the sample jamming problem, but also further simplifies the traditional sample inlet structure, and the left clamping slider and the right clamping slider in the sample dropping head further reduce the cavity above the combustion tube and reduce the purging difficulty.

[0025] Moreover, the sample adding device integrates the sample inlet mechanism, combustion and crucible into an integrated structure, the oxygen supply pipe is arranged in the sample dropping head, which effectively reduces the occupied space of the traditional sample adding device, further improves the integration degree of the sample inlet structure, and facilitates the installation, maintenance, replacement of the staff during use. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the overall structure schematic diagram of the sample adding device of the present application;

[0027] Figure 2 is the cross-sectional structure schematic diagram of the sample adding device of the present application;

[0028] Figure 3 is the cross-sectional structure schematic diagram of the sample dropping head of the sample inlet mechanism of the present application;

[0029] Figure 4 is the overall structure schematic diagram of the sample inlet mechanism of the present application;

[0030] Figure 5 is the structure schematic diagram of the oxygen supply pipe of the sample inlet mechanism of the present application;

[0031] Figure 6is a structural schematic view of a sealing ring of a sample feeding mechanism of the present application;

[0032] Figure 7 is a schematic view of a sample feeding device in S1 step of the sample feeding method of the present application;

[0033] Figure 8 is a schematic view of a sample feeding device in S2 step of the sample feeding method of the present application;

[0034] Figure 9 is a schematic view of a sample feeding device in S3 step of the sample feeding method of the present application;

[0035] Figure 10 is a schematic view of a sample feeding device in S4 step of the sample feeding method of the present application;

[0036] Figure 11 is a schematic view of a sample feeding device in S5 step of the sample feeding method of the present application;

[0037] Figure 12 is a schematic view of a sample feeding device in S6 step of the sample feeding method of the present application;

[0038] Figure 13 is a schematic view of a sample feeding mechanism of the present application;

[0039] Figure 14 is a schematic view of a sample feeding mechanism of the present application.

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] 1, sample feeding mechanism; 1.1, left clamping driving part; 1.2, sample falling head; 1.3, right clamping driving part; 1.4, oxygen supply pipe; 1.5, pipe joint; 1.6, left clamping sliding block; 1.7, sealing ring; 1.8, right clamping sliding block;

[0042] 2, sample; 3, mechanical hand; 4, nitrogen source; 5, combustion pipe; 6, oxygen source; 7, crucible. DETAILED DESCRIPTION

[0043] The present application is further described below in conjunction with the accompanying drawings and examples.

[0044] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods have not been described in detail in order to avoid obscuring the present application. Therefore, the specific embodiments discussed herein are illustrative, and not restrictive, of the scope, spirit, or character of the present application.

[0045] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0047] As shown in Figure 1 , Figure 2 and Figure 5 , an automatic sample feeding mechanism 1 of an automatic element analyzer, the automatic sample feeding mechanism 1 of the automatic element analyzer is used for automatic sample feeding of an element analyzer, and the automatic sample feeding mechanism 1 of the automatic element analyzer comprises a clamping assembly, an oxygen supply pipe 1.4 and a sample dropping head 1.2; the top of the sample dropping head 1.2 is provided with a sample feeding hole for sample feeding, the bottom of the sample dropping head 1.2 is provided with a sample dropping hole for sample dropping, the sample feeding hole and the sample dropping hole are arranged in a staggered manner, the clamping assembly is sealingly arranged in the sample dropping head 1.2 and can open or close the sample feeding hole and the sample dropping hole, and the sample dropping head 1.2 is in communication with the oxygen supply pipe 1.4.

[0048] In this embodiment, the sample feeding mechanism 1 changes the traditional furnace door plug structure into a sample feeding structure matched with the sample dropping head 1.2 through the clamping assembly, so that the sample 2 is clamped to the clamping assembly, and the sample 2 is dropped through clamping and loosening of the clamping assembly, thereby avoiding the sample sticking problem caused by the gap of the face seal of the existing sample feeding mechanism 1 dropping opening and closing assembly or slider assembly, and replacing the furnace door plug (or furnace door baffle) structure by simulating the way of clamping the sample 2 by the mechanical hand 3 through the left clamping slider 1.6 and the right clamping slider 1.8, which not only improves the sample sticking problem, but also further simplifies the traditional sample feeding structure, and the left clamping slider 1.6 and the right clamping slider 1.8 arranged in the sample dropping head 1.2 further reduce the cavity above the combustion pipe 5, and reduce the difficulty of purging.

[0049] Referring to Figure 2 , Figure 3The clamping assembly includes a left clamping drive 1.1, a left clamping slider 1.6, a right clamping drive 1.3, a right clamping slider 1.8, and a sealing ring 1.7. The left clamping slider 1.6 and the right clamping slider 1.8 are slidably disposed within the sample drop head 1.2. The left clamping drive 1.1 and the right clamping drive 1.3 are respectively disposed at both ends outside the sample drop head 1.2. The sealing ring 1.7 is sealed within the sample drop head 1.2, and one end of the left clamping slider 1.6 passes through the sealing ring 1.7 and connects to the left clamping drive 1.1. The output end of the right clamping drive 1.3 passes through the sample drop head 1.2 and connects to the right clamping slider 1.8. The left clamping slider 1.6 can open or close the sample inlet, and the right clamping slider 1.8 can open or close the sample drop hole.

[0050] The left clamping slider 1.6 includes a left slider and a connecting rod. The left slider is slidably disposed inside the sample drop head 1.2 and the width of the left slider is greater than the diameter of the sample inlet. One end of the connecting rod passes through the sealing ring 1.7 and is connected to the output end of the left clamping drive 1.1. The connecting rod and the left slider are integrally formed.

[0051] The right clamping drive 1.3 includes a spring, a right drive component, and a push rod. The right drive component is located on the outer end of the sample dropping head 1.2. The output end of the right drive component is connected to the push rod, and one end of the spring is connected to the right drive cylinder, while the other end of the spring is connected to the push rod. The push rod is connected to the right clamping slider 1.8 to push the right clamping slider 1.8 to close the sample dropping hole. Both the left clamping drive 1.1 and the right drive component are preferably cylinders. These cylinders are fixedly located at both ends of the sample dropping head 1.2, and each cylinder is equipped with a pipe joint 1.5 to drive the output end of the cylinder to reciprocate. The output ends of the two cylinders are respectively connected to a connecting rod and a push rod. Furthermore, under the action of the spring, the push rod is normally pressed out of the right clamping slider 1.8.

[0052] Furthermore, its sealing ring 1.7 is as follows Figure 6 As shown, it is installed in the left circular hole of the sample drop head 1.2 for sealing the left side of the sample drop head 1.2. The left clamping block and the center circular hole of the sealing ring 1.7 achieve the first seal through an O-ring, and the sample drop head 1.2 and the outer circle of the sealing ring 1.7 achieve the second seal through an O-ring, thereby effectively achieving the seal between the sample drop head 1.2 and the left clamping drive 1.1.

[0053] like Figure 10 , 13As shown in FIGS. 14, the sample dropping head 1.2 is provided with a plurality of gas blowing pipe joints, each of which can be connected to an oxygen source to supply oxygen to the cavity, and the sample dropping head 1.2 is further provided with an oxygen supply pipe 1.4 joint connected to the oxygen supply pipe 1.4. In a preferred embodiment, the sample dropping head 1.2 is provided with two gas blowing pipe joints, which are respectively arranged on the left and right sides of the oxygen supply pipe 1.4 joint to respectively blow into the left and right cavities of the sample dropping head 1.2.

[0054] Referring to Figure 1 , the automatic elemental analyzer sample adding device comprises a sample adding mechanism 1, a mechanical hand 3, an oxygen source 6, a combustion pipe 5 and a crucible 7 of the automatic elemental analyzer, the sample adding mechanism 1 is arranged on the combustion pipe 5, the crucible 7 is arranged in the combustion pipe 5 and below the sample dropping hole of the sample adding mechanism 1 to receive the sample 2 dropped by the sample adding mechanism 1, the mechanical hand 3 is above the sample adding mechanism 1 and can clamp the sample 2 above the sample dropping hole of the sample adding mechanism 1, and the oxygen source 6 is connected to the gas blowing pipe joint and the oxygen supply pipe 1.4 joint of the sample adding mechanism 1.

[0055] In this embodiment, the sample adding device integrates the sample adding mechanism 1, the combustion pipe 5 and the crucible 7 into an integrated structure, and the oxygen supply pipe 1.4 is arranged in the sample dropping head 1.2, which effectively reduces the occupied space of the conventional sample adding device and facilitates the automatic replacement of the crucible 7 by the robot.

[0056] The application further provides a sample adding method of an automatic elemental analyzer, which is implemented according to the automatic elemental analyzer sample adding device described above and comprises the following steps:

[0057] S1, initial state: as shown in FIG. 1, the left clamping driving part 1.1 of the sample adding mechanism 1 works to drive the left clamping sliding block 1.6 of the sample adding mechanism 1 to move below the sample dropping hole, the left clamping sliding block 1.6 abuts against the inner wall of the sample dropping head 1.2 to close the sample dropping hole, and the right clamping sliding block 1.8 abuts against the left clamping sliding block 1.6 under the action of the spring; Figure 7

[0058] S2, sample adding: as shown in FIG. 2, after receiving a sample adding request, the mechanical hand 3 moves to the sample dropping hole, the left clamping driving part 1.1 is retracted to drive the left clamping sliding block 1.6 to move towards the end of the sample dropping head 1.2, at this time, the right clamping sliding block 1.8 is separated from the left clamping sliding block 1.6 and moves to the sample dropping hole under the action of the spring to close the sample dropping hole, the mechanical hand 3 is released, and the sample 2 falls into the sample dropping head 1.2; Figure 8

[0059] S3, sample 2 moving: as shown in FIG. 3, the sample 2 is moved to the combustion pipe 5 by the mechanical hand 3, and the sample 2 is clamped by the sample adding mechanism 1. Figure 9 ​​After sample 2 falls into the sample drop head 1.2, the left clamping drive 1.1 performs work, driving the left clamping slider 1.6 of the sample feeding mechanism 1 to move toward the other end of the sample drop head 1.2, causing sample 2 to abut against the right clamping block, and pushing the right clamping block to move until sample 2 is located at the sample drop hole. At this time, the left clamping slider 1.6 closes the sample feeding hole.

[0060] S4, Sample 2 purge: (e.g.) Figure 10 As shown, when the left clamping slider 1.6 and the right clamping slider 1.8 clamp the sample 2 above the sample dropping hole, oxygen is introduced into the air blowing port connector of the sample dropping head 1.2 to purge the cavity inside the sample dropping head 1.2 and remove the air that entered during sample dropping.

[0061] S5. Sample placement: such as Figure 11 As shown, after the oxygen purging is completed, the right clamping drive 1.3 intermittently drives the right clamping slider 1.8, and the right clamping slider 1.8 moves linearly back and forth so that the sample 2 falls from the sample dropping hole of the sample dropping head 1.2.

[0062] S6, see also Figure 12 After sample 2 falls into crucible 7, oxygen is introduced into oxygen supply pipe 1.4 through oxygen supply pipe 1.4 connector so that oxygen can reach crucible 7 through oxygen supply pipe 1.4 to provide oxygen for sample 2 combustion.

[0063] In this embodiment, the clamping assembly allows the sample 2 component to move and be held in place after entering the sample head 1.2 via the cooperation of the left clamping slider 1.6 and the right clamping slider 1.8. This avoids the sample jamming situation that occurs in traditional sample introduction mechanisms 1. Furthermore, the sliders that slide in contact with the inner wall of the sample head 1.2 effectively reduce the cavity within the sample head 1.2, lowering the difficulty of purging. The integrated structure of the oxygen supply tube 1.4 and the sample head 1.2 further enhances the integration of the sample introduction structure, facilitating installation, disassembly, maintenance, and replacement during use.

[0064] In a preferred embodiment, both the left clamping drive 1.1 and the right clamping drive 1.3 include a cylinder and a nitrogen source 4; the cylinder is connected to the nitrogen source 4 to drive the output end of the cylinder to reciprocate. Furthermore, the maximum stroke of the left clamping drive 1.1 is not less than the distance between the left side of the sample dropping hole and the left end of the sample dropping head 1.2.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An automatic sample introduction mechanism for an elemental analyzer, the automatic sample introduction mechanism for automatic sample introduction of an elemental analyzer, characterized by, The automatic elemental analyzer sample feeding mechanism comprises a clamping assembly, an oxygen supply pipe and a sample dropping head; The top of the sample dropping head is provided with a sample feeding hole, and the bottom of the sample dropping head is provided with a sample dropping hole, the sample feeding hole and the sample dropping hole are arranged in a staggered manner, the clamping assembly is sealingly arranged in the sample dropping head and can open or close the sample feeding hole and the sample dropping hole, and the sample dropping head is connected with the oxygen supply pipe.

2. The automated elemental analyzer sample introduction mechanism of claim 1, wherein, The clamping assembly comprises a left clamping driving member, a left clamping sliding block, a right clamping driving member, a right clamping sliding block and a sealing ring. The left clamping sliding block and the right clamping sliding block are slidingly arranged in the sample dropping head, the left clamping driving member and the right clamping driving member are respectively arranged on the two ends outside the sample dropping head, the sealing ring is sealingly arranged in the sample dropping head, one end of the left clamping sliding block penetrates through the sealing ring to connect the left clamping driving member, the output end of the right clamping driving member penetrates through the sample dropping head to connect the right clamping sliding block, and the left clamping sliding block can open or close the sample feeding hole, and the right clamping sliding block can open or close the sample dropping hole.

3. The automated elemental analyzer sample introduction mechanism of claim 2, wherein, The left clamping sliding block comprises a left sliding block and a connecting rod, the left sliding block is slidingly arranged in the sample dropping head and has a width greater than the diameter of the sample feeding hole, one end of the connecting rod penetrates through the sealing ring to be connected with the output end of the left clamping driving member, and the connecting rod is integrally formed with the left sliding block.

4. The automated elemental analyzer sample introduction mechanism of claim 2, wherein, The right clamping driving member comprises a spring, a right driving cylinder and a push rod, the right driving cylinder is arranged on the end outside the sample dropping head, the output end of the right driving cylinder is connected with the push rod, one end of the spring is connected with the right driving cylinder, the other end of the spring is connected with the push rod, and the push rod is connected with the right clamping sliding block to push the right clamping sliding block to close the sample dropping hole.

5. The automated elemental analyzer sample introduction mechanism of claim 2, wherein, The sample dropping head is provided with a plurality of gas blowing pipe joints, the gas blowing pipe joints can be connected with oxygen pipes to supply oxygen to the cavity, and the sample dropping head is further provided with an oxygen supply pipe joint connected with the oxygen supply pipe.

6. An automated elemental analyzer sample addition device, characterized by, The automatic elemental analyzer sample feeding mechanism comprises a clamping assembly, an oxygen supply pipe and a sample dropping head; The sample dropping head is provided with a plurality of gas blowing pipe joints, the gas blowing pipe joints can be connected with oxygen pipes to supply oxygen to the cavity, and the sample dropping head is further provided with an oxygen supply pipe joint connected with the oxygen supply pipe.

7. A method of sample application for an automated elemental analyzer, characterized by, The automatic elemental analyzer sample feeding mechanism comprises a clamping assembly, an oxygen supply pipe and a sample dropping head; The automatic elemental analyzer sample feeding mechanism comprises a clamping assembly, an oxygen supply pipe and a sample dropping head; S1, initial state: the left clamping drive of the sample injection mechanism works to drive the left clamping sliding block of the sample injection mechanism to move below the sample injection hole, the left clamping sliding block abuts against the inner wall of the sample dropping head to close the sample injection hole, and the right clamping sliding block abuts against the left clamping sliding block under the action of the spring; S2, sample injection: after receiving the sample injection request, the mechanical arm moves to the sample injection hole, the left clamping drive is retracted to drive the left clamping sliding block to move towards the end of the sample dropping head, at this time, the right clamping sliding block is separated from the left clamping sliding block and the right clamping sliding block moves to the sample dropping hole under the action of the spring to close the sample dropping hole, the mechanical arm is released, and the sample falls into the sample dropping head; S3, sample movement: after the sample falls into the sample dropping head, the left clamping drive works to drive the left clamping sliding block of the sample injection mechanism to move towards the other end of the sample dropping head, drive the sample to abut against the right clamping block, and drive the right clamping block to move to the position where the sample is located at the sample dropping hole, at this time, the left clamping sliding block closes the sample injection hole; S4, sample purging: when the left clamping sliding block and the right clamping sliding block clamp the sample above the sample dropping hole, oxygen is introduced into the gas blowing port connector of the sample dropping head to purge the cavity in the sample dropping head to discharge the air entering during sample dropping; S5, sample dropping: after the oxygen purging is completed, the right clamping drive intermittently drives the right clamping sliding block, and the right clamping sliding block linearly reciprocates to make the sample fall from the sample dropping hole of the sample dropping head; S6, after the sample falls into the crucible, oxygen is introduced into the oxygen supply pipe through the oxygen supply pipe connector to make the oxygen reach the crucible through the oxygen supply pipe to provide oxygen for sample combustion.

8. The method of claim 7, wherein, The left clamping drive and the right clamping drive each include a gas cylinder and a nitrogen source; the gas cylinder is in communication with the nitrogen source to drive the output end of the gas cylinder to reciprocate.

9. The method of claim 7, wherein, The maximum stroke of the left clamping drive is not less than the distance between the left side of the sample dropping hole and the left end of the sample dropping head.

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