CN111856055A - Feeding mechanism - Google Patents

Abstract

The invention discloses a feeding mechanism, which comprises a sample conveying disc which rotates under the drive of a motor, wherein a plurality of sample holes are formed in the circumference of the sample conveying disc, a purging device is arranged on the lower side of the circumference of the sample conveying disc, the purging device comprises a valve body and a valve rod which can move in the valve body, a sample containing groove is formed in the valve rod, and the valve body is sequentially provided with a first groove position, a sixth groove position and a fourth groove position, wherein the first groove position is used for enabling the valve rod to realize sample injection at a sample injection position, the sixth groove position is used for enabling the valve rod to realize sample purging at a purging position, and the fourth groove position is used for enabling the valve rod to realize sample falling at a sample falling position. The blowing device of the feeding mechanism realizes the movement of the sample among the sampling position, the blowing position and the sample dropping position, realizes automatic sampling, zero blank blowing and automatic sample dropping, solves the problems of high noise, large fluctuation and easy sample clamping of the sample feeding disc, and also solves the problem that air interference particles enter the combustion chamber to pollute the reflecting environment.

Description

a feeding mechanism

technical field

The invention relates to the technical field of conveying operations, in particular to a feeding mechanism.

Background technique

The sample feeding mechanism is commonly used in the automatic sample feeding of laboratory elemental analysis instruments. It mainly realizes the automatic sequential sampling of the sample, the purging of the sample into the air, and the automatic falling of the sample into the combustion chamber.

The existing sample feeding mechanism is a slider type structure, the sample feeding plate pushes the slider through the cylinder, and the ratchet mechanism on the slider pushes the stop pin connected to the sample plate to realize the indexing feeding of the sample plate; Load the sample into the furnace door plug, then restore the sealing position, purge the sample with purging gas, and evacuate the exhaust gas through the combustion chamber, and finally the furnace door plug cylinder acts to release the sample into the combustion chamber for decomposition. It has the following defects: first, the sample feeding tray is driven by a cylinder, and the rigid collision noise is large, and the pressure fluctuation of the power gas is large, and the sample is easy to jam; second, there is no sealed purge volume, and when the sample falls after being purged, air interference The particles easily enter the combustion chamber and pollute the reaction environment.

Therefore, how to provide a feeding mechanism that can solve the problems of high noise, large fluctuation and easy jamming of the sample feeding tray and air interference particles entering the combustion chamber to pollute the reaction environment is a technical problem that those skilled in the art need to solve urgently.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a feeding mechanism, the purging device can realize the movement of the sample between the three positions of the sampling position, the purging position and the sampling position, so as to realize automatic sampling, zero blank purging and automatic sampling, It solves the problems of high noise, large fluctuation and easy jamming of the sample feeding tray, and also solves the problem of air interference particles entering the combustion chamber and polluting the environment.

In order to achieve the above purpose, the present invention provides a feeding mechanism, which includes a sample feeding disc that rotates under the driving of a motor, a plurality of sample holes are arranged along the circumference of the sample feeding disc, and the circumference of the sample feeding disc is on the lower side. A purging device is provided. The purging device includes a valve body and a valve stem that can move in the valve body. The valve stem is provided with a sample holding groove. The first slot for sample injection at the sample injection position, the sixth slot for the valve stem to realize sample purging in the purge position, and the sixth slot for the valve stem to realize the sample in the drop position. The fourth slot of the drop.

Preferably, the purging device includes a sample drop cone disposed below the sample feeding tray, and the sample drop cone communicates with the first groove.

Preferably, the drop cone is wide at the top and narrow at the bottom, and the inner wall of the drop cone is tapered from top to bottom.

Preferably, the valve body is provided with a second slot between the first slot and the sixth slot and/or between the sixth slot and the fourth slot The third slot and/or the fifth slot on the side of the fourth slot away from the first slot, the second slot, the third slot and the fifth slot The position is used to install the sealing ring.

Preferably, a linear slide rail connected with the valve stem and used to drive the valve stem to move linearly in the valve body is included.

Preferably, the valve body is provided with a first vent hole, a second vent hole, and an air inlet slot which is communicated with the sixth slot and is used for introducing the purge gas or the combustion gas.

Preferably, the sample holes include a plurality of first sample holes and a plurality of second sample holes arranged in a staggered manner, and the first sample holes and the second sample holes are respectively located on two concentric circles.

Compared with the above-mentioned background technology, the feeding mechanism provided by the present invention includes a motor, a sample feeding tray and a purging device. The purging device is arranged on the lower side of the circumference of the sample feeding tray, and the sample feeding tray is driven by the motor to rotate. There are several sample holes on the circumference of the sample feeding tray. The purging device includes a valve body and a valve stem. The valve stem can move in the valve body. The valve stem is provided with a volume slot. And the fourth slot, the first slot is used for the valve stem to realize sample injection at the injection position, the sixth slot is used for the valve stem to realize the purging of the sample at the purge position, and the fourth slot is used to The valve rod is placed at the sample-dropping position to realize the drop of the sample; the feeding mechanism is driven by the motor to realize the rotation of the sample-feeding plate, through the sample hole to send the sample from the sample-feeding plate to the purging device, and through the volume slot to realize the sample feeding Into the purging device, through the valve stem moving in the valve body to realize the movement of the valve stem to the processing position of the three samples, and then realize the movement of the volume tank and the samples in the volume tank to the processing position of the three samples, through the movement of the valve stem To the first slot to realize the sample injection in the volume slot, move the valve stem to the sixth slot to realize the sample in the volume slot to purge the sample here, move the valve stem to the fourth slot The slot position is to realize the sample in the volume slot where the sample is dropped; the feeding mechanism is driven by the motor to drive the sample feeding tray, and the purging device realizes that the sample can be placed in one of the three positions of the sampling position, the purging position and the sampling position. It can realize automatic sample injection, zero blank purging and automatic sample drop, which solves the problem of large noise, large fluctuation and easy sample jam of the sample feeding tray, and also solves the problem of air interference particles entering the combustion chamber and polluting the environment.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic structural diagram of a feeding mechanism provided by an embodiment of the present invention;

Fig. 2 is the structural representation of the sample feeding tray in Fig. 1;

FIG. 3 is a schematic structural diagram of the purging device in FIG. 1 .

in:

1-Sampling tray, 2-Purge device, 1101-First sample hole, 1102-Second sample hole, 2101-First vent hole, 2102-Second vent hole, 22-Sampling cone, 23-Valve Body, 24-valve stem, 241-sample tank, 25-linear slide rail, 2601-first slot, 2602-second slot, 2603-third slot, 2604-fourth slot, 2605-first slot Five slots, 2606-sixth slot, 27-intake slot.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to make those skilled in the art better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to FIGS. 1 to 3 , wherein FIG. 1 is a schematic structural diagram of a feeding mechanism provided by an embodiment of the present invention, FIG. 2 is a structural schematic diagram of a sample feeding tray in FIG. 1 , and FIG. 3 is a structural schematic diagram of the purging device in FIG. 1 . .

In a first specific embodiment, the feeding mechanism provided by the present invention includes a sample feeding tray 1 and a purging device 2. The purging device 2 is arranged below the sample feeding tray 1, and the sample feeding tray 1 drops the sample into the blowing device. In the purging device 2; more specifically, several sample holes are provided along the circumference of the sample feeding tray 1, the purging device 2 is correspondingly arranged on the lower side of the circumference of the sample feeding tray 1, and the sample falls into the subsequent purging device 2 through the sample holes middle. In addition, the sample feeding tray 1 is driven by a motor, and the sample feeding tray 1 rotates under the driving of the motor; the purging device 2 is a spool valve structure, and the purging device 2 includes a valve body 23 and a sleeved valve stem 24. The valve stem 24 can move in the valve body 23. The valve stem 24 is provided with a sample holding groove 241. The valve body 23 is sequentially provided with a first groove position 2601, a sixth groove position 2606 and a fourth groove position 2604, three groove positions. Corresponding to the sample injection position of sample injection, the purging position of sample purging and the sample drop position of sample drop respectively, when the valve stem 24 moves in the valve body 23, the sample holding tank 241 moves to the first slot 2601 respectively. , three positions corresponding to the sixth slot 2606 and the fourth slot 2604 for sample injection, sample purging and sample drop.

In this embodiment, the motor drives the sample feeding tray 1 to rotate, and the sample falls into the lower purging device 2 through the sample hole. At this time, the valve stem 24 moves to the sample feeding position of the valve body 23, and the sample holding groove 241 is located in the first groove. At position 2601, the first slot 2601 penetrates upward and faces the sample hole, and the sample directly falls into the sample holding tank 241 through the sample hole to realize sample injection; in the next step, the valve stem 24 moves to the purge position of the valve body 23 , the sample holding tank 241 is located at the sixth slot 2606, the sixth slot 2606 is connected to the outside world and can be fed with purge gas and circulated, and the sample in the sample holding tank 241 is purged by the action of the purge gas; the next step At this time, the valve stem 24 moves to the sample-dropping position of the valve body 23, and the sample container 241 is located at the fourth slot 2604. The fourth slot 2604 penetrates downward and faces the equipment in the subsequent steps. The sample falls under the action of gravity.

The feeding mechanism is driven by the motor to send the sample tray 1, and the purging device 2 realizes the movement of the sample between the three positions of the sample injection position, the purge position and the sample drop position, and realizes automatic sample injection, zero blank purging and automatic sample drop. , solves the problem of high noise, large fluctuation and easy jamming of sample feeding tray 1, and also solves the problem of air interference particles entering the combustion chamber and polluting the environment.

For better technical effect, the purging device 2 includes a sample drop cone 22 arranged under the sample feeding tray 1, the top of the sample drop cone 22 is open, and the end of the sample drop cone 22 communicates with the first slot 2601. The function of 22 is to better collect the sample, so that the sample can fall into the purging device 2 completely.

Exemplarily, the drop cone 22 is in the shape of a cone; more specifically, it is a cone; the drop cone 22 is wide at the top and narrow at the bottom, the inner wall of the drop cone 22 is tapered from top to bottom, and has the largest cross-section at the top, so as to facilitate the The sample collection inflow at the top has a minimum cross-section at the end to facilitate the collection inflow of the sample at the end.

For better technical effect, the three positions in the valve body 23 are isolated from each other into three independent areas, and sealing isolation can be achieved between any two areas by a sealing ring, thereby improving the sealing performance between different areas. In other words, sealing isolation can be achieved between the sampling position, the purging position and the sampling position through the form of a sealing ring, and the sealing ring can be assembled in the annular groove opened in the valve body 23; more specifically, the valve body 23 is provided with The second slot 2602 between the first slot 2601 and the sixth slot 2606 and/or the third slot 2603 between the sixth slot 2606 and the fourth slot 2604 and/or the third slot 2603 between the sixth slot 2606 and the fourth slot 2604 The fourth slot 2604 is away from the fifth slot 2605 on the side of the first slot 2601 . The second slot 2602 , the third slot 2603 and the fifth slot 2605 are used for installing the sealing ring.

In a specific embodiment, the valve stem 24 can be driven to move in the valve body 23 in the form of a linear slide rail 25; wherein, the linear slide rail 25 is connected with the valve stem 24, and the two ends of the linear slide rail 25 are respectively It is fixedly connected with both ends of the valve rod 24, so that the valve rod 24 and the linear slide rail 25 keep synchronous movement. It is converted into the linear motion power of the linear slide rail 25 , and then drives the valve stem 24 to perform linear motion in the valve body 23 .

Exemplarily, the valve body 23 is provided with a first vent hole 2101, a second vent hole 2102, and is communicated with the air inlet groove 27 and the sixth slot 2606 of the air inlet groove 27, and the function of the air inlet groove 27 is to introduce the purge gas. or combustion gas.

In a specific embodiment, the sample holes are arranged in two groups in a staggered manner; The second sample holes 1102 are respectively located on two concentric circles, and the radius of the concentric circles where the first sample holes 1101 are located is larger than the radius of the concentric circles where the second sample holes 1102 are located. There are two rows of staggered sample position holes, the first sample hole 1101 is located outside the second sample hole 1102, for example, there are 72 in total.

In this embodiment, staggered means that the second sample holes 1102 are located between two adjacent first sample holes 1101. The staggered arrangement is beneficial to reduce the distance between the sample injection holes in a small space. This facilitates the next injection of the sample, and makes the conical injection of the sample drop cone 22 more reliable.

When the sample is sent, the sample alternately falls into the subsequent purging device 2 through the sample hole, so that more samples can be put in the limited space; the sample plate 1 is driven by the motor to rotate the inner gear to achieve a reduction ratio of 11:1, In addition to increasing the rotational torque, the step angle of the stepper motor is also subdivided to achieve precise sampling.

It should be noted that, in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such existence between these entities. The actual relationship or sequence.

The feeding mechanism provided by the present invention has been introduced in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (7)

1. A feeding mechanism is characterized in that, comprising a sample feeding plate (1) that performs a rotary motion under the driving of a motor, and is provided with several sample holes along the circumference of the sample feeding plate (1), and the sample feeding plate The lower side of the circumference of (1) is provided with a purging device (2), the purging device (2) includes a valve body (23) and a valve stem (24) that can move in the valve body (23), the The valve stem (24) is provided with a sample holding groove (241), and the valve body (23) is sequentially provided with a first groove position (2601) for the valve stem (24) to realize sample injection at the injection position , a sixth slot (2606) for the valve stem (24) to realize the purging of the sample at the purging position, and a sixth slot (2606) for the valve stem (24) to realize the drop of the sample at the drop position Four slots (2604). 2 . The feeding mechanism according to claim 1 , wherein the purging device ( 2 ) comprises a sample dropping cone ( 22 ) arranged below the sample feeding tray ( 1 ), and the sample dropping cone ( 22) communicate with the first slot (2601). 3 . The feeding mechanism according to claim 2 , wherein the drop cone ( 22 ) is wide at the top and narrow at the bottom, and the inner wall of the drop cone ( 22 ) is tapered from top to bottom. 4 . 4. The feeding mechanism according to any one of claims 1 to 3, characterized in that, the valve body (23) is provided with the first slot (2601) and the sixth slot (2606) The second slot (2602) between and/or the third slot (2603) between the sixth slot (2606) and the fourth slot (2604) and/or the third slot (2603) between the sixth slot (2606) and the fourth slot (2604) The fourth slot (2604) is away from the fifth slot (2605) on the side of the first slot (2601), the second slot (2602), the third slot (2603) and all The fifth groove (2605) is used for installing the sealing ring. 5. The feeding mechanism according to any one of claims 1 to 3, characterized in that it comprises a valve rod (24) connected to the valve rod (24) for driving the valve rod (24) on the valve body (23) Linear slide rail (25) for linear motion in the middle. 6. The feeding mechanism according to any one of claims 1 to 3, wherein the valve body (23) is provided with a first vent hole (2101), a second vent hole (2102) and a The six slots (2606) are connected to the inlet slots (27) for introducing the purging gas or combustion gas. 7. The feeding mechanism according to any one of claims 1 to 3, wherein the sample holes comprise a plurality of first sample holes (1101) and a plurality of second sample holes (1102) arranged in a staggered manner, the The first sample hole (1101) and the second sample hole (1102) are respectively located on two concentric circles.

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