CN115683729A - Sampling system of coal as fired - Google Patents

Abstract

The utility model relates to a sampling system of coal as fired, which comprises a sampling machine, a sample preparation mechanism and a residual coal recovery mechanism; the feed inlet of system appearance mechanism with the discharge gate of sampling machine is connected, surplus coal recovery mechanism includes that first material receiving part, second connect material part and screw conveyer, first material receiving part connect in screw conveyer, first material receiving part keeps away from screw conveyer's one end is used for connecing the surplus coal that system appearance mechanism produced and the surplus coal that will connect the sample are leading-in to screw conveyer, the second connect material part connect in first material receiving part, the second connects material part to keep away from the one end of first material receiving part is used for connecing the surplus coal that the artifical system appearance produced. This sampling system can directly connect the surplus coal that system appearance mechanism produced and the surplus coal that artifical system appearance produced to avoid the surplus coal extravagant, also can improve the recovery efficiency of surplus coal.

Description

Sampling system of coal as fired

Technical Field

The disclosure relates to the technical field of coal as fired sampling, in particular to a coal as fired sampling system.

Background

The coal as fired in the power plant needs to be sampled, and samples obtained through the sampling process are used for carrying out relevant detection.

Can produce more surplus coal at present sampling in-process, surplus coal majority can directly drop subaerial, leads to the waste of coal charge, mainly retrieves this part surplus coal through artifical shovel fortune at present, but recovery efficiency is low and need consume more manpower resources, leads to artifical working strength higher.

Disclosure of Invention

The utility model aims at providing a sampling system of coal as fired to solve the waste and the low problem of recovery efficiency of the surplus coal that produce in the aforesaid sampling process.

In order to achieve the purpose, the present disclosure provides a sampling system for as-fired coal, comprising a sampling machine, a sample preparation mechanism and a residual coal recovery mechanism;

the feed inlet of system appearance mechanism with the discharge gate of sampling machine is connected, surplus coal recovery mechanism includes that first material receiving part, second connect material part and screw conveyer, first material receiving part connect in screw conveyer, first material receiving part keeps away from screw conveyer's one end is used for connecing get the surplus coal that system appearance mechanism produced and the surplus coal that will connect get leading-in extremely screw conveyer, the second connect material part connect in first material receiving part, the second connects material receiving part to keep away from the one end of first material receiving part is used for connecing the surplus coal that artifical system appearance produced.

Optionally, system appearance mechanism includes collection appearance ware and scrapes the formula splitter of sweeping, collection appearance ware has sample export and surplus coal export, it has first discharge gate and second discharge gate to scrape the formula splitter, scrape the first discharge gate of sweeping the formula splitter with the feed inlet of collection appearance ware is connected, first material receiving component is used for connecing and gets scrape the discharged coal charge of the second discharge gate of sweeping the formula splitter and the surplus coal export discharged coal charge of collection appearance ware.

Optionally, first material receiving component includes first material receiving hopper, second material receiving hopper and passage, first material receiving hopper connect in screw conveyer's feed inlet, screw conveyer is located the below of system appearance mechanism, first material receiving hopper is located the below of the surplus coal export of collection appearance ware, so that the surplus coal export exhaust coal charge of collection appearance ware drops extremely first material receiving hopper, the passage is vertical setting, the second material receiving hopper connect in the top of passage, the bottom of passage with screw conveyer connects, the second material receiving hopper is located scrape the below of sweeping type division ware's second discharge gate, so that scrape the second discharge gate exhaust coal charge of sweeping type division ware and drop extremely the second material receiving hopper.

Optionally, the sample preparation mechanism further comprises a crusher and a blanking pipe, the blanking pipe is vertically arranged, the top of the blanking pipe is connected with the discharge port of the sample collector, the feed port of the crusher is connected with the bottom of the blanking pipe, and the discharge port of the crusher is connected with the feed port of the scraping and sweeping type divider.

Optionally, the second connects the material part to include third material hopper and connecting pipe, the connecting pipe is vertical setting, the third connect the material hopper connect in the top of connecting pipe, the third connects the material hopper to be used for connecing the surplus coal that produces of getting artifical system appearance, the bottom of connecting pipe with first material part that connects is connected.

Optionally, surplus coal recycling mechanism still includes the fill and carries the machine and connect the conveyer pipe, connect conveyer pipe connect in the feed end that the fill carried the machine, connect the conveyer pipe and keep away from the one end that the fill carried the machine with screw conveyer's discharge gate is connected, the fill is carried the machine and is used for carrying the coal charge to the conveyer belt of coal as fired.

Optionally, the horizontal height of the feed end of the bucket elevator is lower than the horizontal height of the discharge port of the screw conveyor, and the connecting conveying pipe extends obliquely downwards.

Optionally, the bucket elevator includes a housing, a chain link, a driving mechanism, and a plurality of conveying hoppers with closed bottoms, an inlet is opened on one side of the bottom of the housing, an outlet is opened on the other side of the top of the housing, the chain link is rotatably connected in the housing and in transmission connection with a driving end of the driving mechanism, the driving mechanism is configured to drive the chain link to rotate, and each conveying hopper is connected to the chain link.

Optionally, the number of the conveying hoppers is 90-110, and the width of the hopper opening of each conveying hopper is 10cm-11cm.

Optionally, the remaining coal recycling mechanism further comprises a controller, a first overload protection sensor and a second overload protection sensor, the first overload protection sensor is connected to the spiral conveyer, the second overload protection sensor is connected to the bucket elevator, the first overload protection sensor and the second overload protection sensor are electrically connected to the controller, the sampling machine, the sampling mechanism, the spiral conveyer and the bucket elevator are electrically connected to the controller, and the controller can control the sampling machine, the sampling mechanism, the spiral conveyer and the bucket elevator to stop according to a detection result of the first overload protection sensor and/or the second overload protection sensor.

Above-mentioned technical scheme can connect the surplus coal that system appearance mechanism produced at system appearance in-process through first material receiving part, can avoid the surplus coal directly to drop subaerially, does not need the manual work to carry out the scraper to the artifical working strength who retrieves the surplus coal of greatly reduced improves surplus coal recovery efficiency simultaneously. The second material receiving component can receive residual coal generated by manual sample preparation, and manual excessive cleaning is not needed, so that manual sample preparation is more convenient. Can retrieve the unified transport of the surplus coal of connecing of the screw conveyer through setting up, need not carry out the scraper to avoid producing the raise dust problem, make the surplus coal retrieve the convenience alright reuse. In addition, automatic sample preparation can be realized through the arranged sample preparation mechanism.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic block diagram of a sampling system according to one embodiment of the present disclosure;

fig. 2 is a partial internal structural schematic view of a bucket elevator according to an embodiment of the present disclosure.

Description of the reference numerals

1. Sampling a sample machine;

2. the device comprises a sample preparation mechanism 21, a blanking pipe 22, a crusher 23, a scraping and sweeping type divider 231, a dividing and conveying belt 232, a scraping and sweeping mechanism 24 and a sample collector;

3. a screw conveyor;

4. the device comprises a first material receiving part 41, a material guide pipe 42, a first material receiving hopper 43 and a second material receiving hopper;

5. a second material receiving part 51, a connecting pipe 52 and a third material receiving hopper;

6. the device comprises a bucket elevator 61, a shell 62, chain links 63, a conveying hopper 64, a driving mechanism 65, an inlet port 66 and an outlet port;

7. connecting a conveying pipe;

8. a coal as fired conveyer belt.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the use of directional terms such as "upper, lower, left, and right" are generally defined in the direction of the drawing plane of the drawings, and "inner and outer" refer to the inner and outer of the relevant component parts. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present disclosure, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

The coal as fired in the power plant needs to be sampled, and a sample obtained through the sampling procedure is used for carrying out related detection.

Can produce more surplus coal at present sampling process, surplus coal majority can directly drop subaerial, leads to the waste of coal charge, mainly retrieves this part surplus coal through artifical shovel fortune at present, but recovery efficiency is low and need consume more manpower resources, leads to artifical working intensity higher, is unfavorable for the playback of surplus coal and recycles.

In addition, the sampling process can carry out artifical system appearance division to total appearance, also can produce the surplus coal during artifical system appearance, also adopts artifical shovel to transport to retrieve at present, probably produces the raise dust condition during artifical shovel transport surplus coal, influences the air circumstance.

In addition, the process and the manual sample preparation process are generally carried out on 2 layers, when the residual coal is recovered by manual shoveling, the residual coal needs to be transferred to 1 layer and then transported back to a coal yard by a forklift, and the time is very long.

To this end, as shown in fig. 1 and 2, the present disclosure provides a sampling system for coal as fired, which includes a sampling machine 1, a sample preparation mechanism 2, and a residual coal recovery mechanism.

The feed inlet of system appearance mechanism 2 is connected with the discharge gate of sampler 1, surplus coal recovery mechanism includes first material receiving component 4, second material receiving component 5 and screw conveyer 3, first material receiving component 4 connects in screw conveyer 3, the one end that screw conveyer 3 was kept away from to first material receiving component 4 is used for connecing the surplus coal that system appearance mechanism 2 produced and leading-in to screw conveyer 3 with the surplus coal of connecing, second material receiving component 5 connects in first material receiving component 4, the one end that first material receiving component 4 was kept away from to second material receiving component 5 is used for connecing the surplus coal that artifical system appearance produced.

Wherein, the coal charge that the sampler 1 was used for gathering and is carrying on the coal conveyer belt 8 of firing, the coal charge that the sampler 1 gathered can enter into system appearance mechanism 2 from the discharge gate, can realize automatic system appearance through system appearance mechanism 2. And part of the coal material can be prepared into samples manually.

Wherein, first material receiving component 4 can connect the surplus coal that system appearance mechanism 2 produced, can collect the surplus coal that system appearance mechanism 2 produced, avoids the surplus coal that system appearance mechanism 2 produced to drop subaerially, and the surplus coal that connects the getting leading-in screw conveyer 3, carries in unison through screw conveyer 3 and retrieves to do not need the manual work to carry the surplus coal.

Wherein, the second connects material part 5 can connect and get artifical system appearance and produce surplus coal, and the remaining coal charge of artifical system appearance can be poured into second and connect material part 5 in the system appearance in-process, leads into first material part 4 that connects through second material part 5 to enter into screw conveyer 3, carry the recovery.

Among the above-mentioned technical scheme, can connect the surplus coal that system appearance mechanism 2 produced in the system appearance in-process through first material receiving part 4, can avoid the surplus coal directly to drop subaerially, do not need the manual work to carry out the scraper to the artifical working strength who retrieves the surplus coal of greatly reduced improves surplus coal recovery efficiency simultaneously. The second material receiving component 5 can receive the residual coal generated by manual sample preparation, and manual excessive cleaning is not needed, so that manual sample preparation is more convenient. Can retrieve the unified transport of the surplus coal of connecing through screw conveyer 3 that sets up, need not carry out the scraper to avoid producing the raise dust problem, make surplus coal retrieve the convenience alright reuse. In addition, automatic sample preparation can be realized through the arranged sample preparation mechanism 2.

Alternatively, in an embodiment of the present disclosure, the sample preparation mechanism 2 includes a sample collector 24 and a scraper-type splitter 23, the sample collector 24 has a sample outlet and a residual coal outlet, the scraper-type splitter 23 has a first discharge port and a second discharge port, the first discharge port of the scraper-type splitter 23 is connected to the feed port of the sample collector 24, and the first material receiving member 4 is configured to receive the coal discharged from the second discharge port of the scraper-type splitter 23 and the coal discharged from the residual coal outlet of the sample collector 24.

In the present embodiment, the scraping type splitter 23 is used for splitting the coal collected by the sampler 1, the unnecessary coal is discharged from the second discharge port of the scraping type splitter 23 during the splitting process, the necessary coal enters the sample collector 24 from the first discharge port of the scraping type splitter 23, and the secondary splitting is performed by the sample collector 24. The coal discharged from the second discharge port of the scraping and sweeping type divider 23 can fall into the first receiving part 4, so that the residual coal is recovered.

In which the required coal in the collector 24 is discharged from the sample outlet and can be used for analysis, while the unnecessary coal can be discharged from the residual coal outlet of the collector 24. The coal discharged from the residual coal outlet of the sample collector 24 can fall into the first receiving part 4, so that the residual coal can be recovered.

Can retrieve simultaneously through the first material receiving part 4 that sets up and sweep formula division ware 23 and the remaining coal of collection appearance ware 24 exhaust to can directly collect the remaining coal at the system appearance in-process, do not need the remaining coal to drop subaerial manual work again and carry out the scraper, make the remaining coal retrieve very conveniently.

Alternatively, in some examples, the collector 24 may be a rotary collector 24 or a decimator 24.

Alternatively, in some examples, the scraping and sweeping type splitter 23 includes a splitting conveyer belt 231 and a scraping and sweeping mechanism 232, the scraping and sweeping mechanism 232 is connected to the splitting conveyer belt 231, the splitting conveyer belt 231 is used for conveying coal, during the coal is conveyed by the splitting conveyer belt 231, the scraping and sweeping mechanism 232 can continuously scrape the coal on the splitting conveyer belt 231, so that part of the coal falls off the splitting conveyer belt 231, the fallen coal is unnecessary coal, and another part of the coal falls off the collector 24 under the conveying action of the splitting conveyer belt 231.

Optionally, in an embodiment of the present disclosure, the first material receiving component 4 includes a first material receiving hopper 42, a second material receiving hopper 43, and a material guiding pipe 41, the first material receiving hopper 42 is connected to a feeding port of the screw conveyor 3, the screw conveyor 3 is located below the sample making mechanism 2, the first material receiving hopper 42 is located below the residual coal outlet of the sample collector 24, so that the coal material discharged from the residual coal outlet of the sample collector 24 drops to the first material receiving hopper 42, the material guiding pipe 41 is vertically disposed, the second material receiving hopper 43 is connected to the top of the material guiding pipe 41, the bottom of the material guiding pipe 41 is connected to the screw conveyor 3, and the second material receiving hopper 43 is located below the second discharging port of the scraping and sweeping type divider 23, so that the coal material discharged from the second discharging port of the scraping and sweeping type divider 23 drops to the second material receiving hopper 43.

In the embodiment, the cross sections of the first receiving hopper 42 and the second receiving hopper 43 are both trapezoidal, the top and the bottom of the first receiving hopper 42 and the bottom of the second receiving hopper 43 are both open, the length and the width of the top of the first receiving hopper 42 are greater than the length and the width of the bottom of the first receiving hopper 42, and the length and the width of the top of the second receiving hopper 43 are greater than the length and the width of the bottom of the second receiving hopper 43, so that the first receiving hopper 42 and the second receiving hopper 43 can collect coal.

Wherein, the bottom of the first material receiving hopper 42 is connected with the feed inlet of the screw conveyor 3, so that the coal material entering the first material receiving hopper 42 can enter the screw conveyor 3 through the feed inlet of the screw conveyor 3 and be conveyed away. The coal discharged from the remaining coal outlet of the sample collector 24 can be collected by the first receiving hopper 42. The coal can be divided by the sample collector 24, and the unnecessary coal is discharged from the residual coal outlet of the sample collector 24 and then directly falls into the first material receiving hopper 42, and then enters the screw conveyor 3.

It should be noted that the length and width of the top of the first receiving hopper 42 is greater than the length and width of the residual coal outlet of the sample collector 24, so as to ensure the receiving of the coal.

The bottom of the second receiving hopper 43 is connected to the top of the guiding tube 41, the second receiving hopper 43 is used for receiving and collecting the coal dropped from the second discharge port of the scraping and sweeping type splitter 23, and the guiding tube 41 is used for guiding the coal to the screw conveyor 3.

In some examples, a connection port is provided at the top of the screw conveyor 3, and the bottom of the guide tube 41 is connected to the connection port. It should be noted that the length and width of the top of the second receiving hopper 43 is greater than the length and width of the second discharge port of the scraping and sweeping type splitter 23, so as to ensure the receiving and fetching of the coal.

Optionally, in an embodiment of the present disclosure, the sample preparation mechanism 2 further includes a crusher 22 and a blanking pipe 21, the blanking pipe 21 is vertically disposed, a top of the blanking pipe 21 is connected to a discharge port of the sampler 1, a feed port of the crusher 22 is connected to a bottom of the blanking pipe 21, and a discharge port of the crusher 22 is connected to a feed port of the scraping and sweeping type divider 23.

In the embodiment, the blanking pipe 21 is used for guiding the coal collected by the sampling machine 1 into the crusher 22, and the crusher 22 is used for crushing the coal, so that the coal is favorably divided and sampled.

Optionally, in an embodiment of the present disclosure, the second receiving component 5 includes a third receiving hopper 52 and a connecting pipe 51, the connecting pipe 51 is vertically disposed, the third receiving hopper 52 is connected to the top of the connecting pipe 51, the third receiving hopper 52 is used for receiving the residual coal generated by artificial sampling, and the bottom of the connecting pipe 51 is connected to the first receiving component 4.

In the embodiment, the third receiving hopper 52 can directly pour the residual coal generated during the manual sample preparation into the third receiving hopper 52, the coal is guided into the first receiving part 4 through the third receiving hopper 52 and the connecting pipe 51, and then the coal enters the screw conveyor 3, and the coal is conveyed by the screw conveyor 3.

Alternatively, in some examples, a connection hole is formed at the middle portion of the guide tube 41, and the bottom of the connection tube 51 is connected to the connection hole.

It is understood that the sampling machine 1 and the hand sample preparation are arranged in 2 layers, and the screw conveyor 3 is arranged in one layer, so that the coal material is introduced into the material guiding pipe 41 under the gravity after the residual coal generated by the hand sample preparation is poured into the third receiving hopper 52.

Optionally, in an embodiment of the present disclosure, the remaining coal recycling mechanism further includes a bucket elevator 6 and a connecting conveying pipe 7, the connecting conveying pipe 7 is connected to a feed end of the bucket elevator 6, one end of the connecting conveying pipe 7 far away from the bucket elevator 6 is connected to a discharge port of the screw conveyor 3, and the bucket elevator 6 is configured to convey the coal material to a coal as fired conveying belt 8.

In the present embodiment, the connecting duct 7 is used to guide the coal material output from the discharge port of the screw conveyor 3 into the bucket elevator 6, and the coal material recovered by the bucket elevator 6 is conveyed upward, so that the coal material returns to the coal-as-fired conveyor belt 8 and is conveyed back to the furnace by the coal-as-fired conveyor belt 8.

Alternatively, in an embodiment of the present disclosure, the feed end of the bucket elevator 6 is located at a lower level than the discharge port of the screw conveyor 3, and the connecting duct 7 is provided to extend obliquely downward.

The discharge gate that is less than screw conveyer 3 is set up through the feed end with bucket elevator 6 for the coal charge of screw conveyer 3 output can enter into bucket elevator 6 fast at the auxiliary action of gravity, avoids appearing the problem of chute blockage.

Optionally, in an embodiment of the present disclosure, the bucket elevator 6 includes a housing 61, a chain link 62, a driving mechanism 64, and a plurality of conveying hoppers 63 with closed bottoms, an inlet 65 is opened on one side of the bottom of the housing 61, an outlet 66 is opened on the other side of the top of the housing 61, the chain link 62 is rotatably connected in the housing 61 and is in transmission connection with a driving end of the driving mechanism 64, the driving mechanism 64 is configured to drive the chain link 62 to rotate, and each conveying hopper 63 is connected to the chain link 62.

In the present embodiment, the chain link 62 and the conveying hoppers 63 are both located in the housing 61, the driving mechanism 64 is connected to the housing 61, the chain link 62 forms an annular shape, the plurality of conveying hoppers 63 are connected to the chain link 62 at intervals to form an annular shape, the driving mechanism 64 includes a motor and a gear, the gear is engaged with the chain link 62, the driving mechanism 64 drives the chain link 62 to rotate, and the conveying hoppers 63 connected to the chain link 62 also rotate along with the chain link, so that the coal is conveyed from the inlet 65 to the outlet 66 to be discharged.

Wherein the inlet opening 65 and the outlet opening 66 are located on opposite sides of the housing 61 such that, with the rotation of the chain link 62, the feed hopper 63 receives the coal at the inlet opening 65 and discharges the coal at the outlet opening 66.

Alternatively, in one embodiment of the present disclosure, the number of the conveying hoppers 63 is 90 to 110, and the width of the mouths of the conveying hoppers 63 is 10cm to 11cm.

Through so setting up the conveying capacity that can increase the coal charge, also can avoid simultaneously because the problem of coal blockage appears under the moisture of coal charge and the great condition of glutinous branch to improve bucket and carried quick-witted 6 life, reduced bucket and carried quick-witted 6 trouble incidence and the maintenance work volume.

In some examples, the number of the conveying hoppers 63 is 100, and the width of the mouth of the conveying hopper 63 is 10cm.

Optionally, in an embodiment of the present disclosure, the remaining coal recycling mechanism further includes a controller, a first overload protection sensor and a second overload protection sensor, the first overload protection sensor is connected to the screw conveyor 3, the second overload protection sensor is connected to the bucket elevator 6, the first overload protection sensor and the second overload protection sensor are both electrically connected to the controller, the sampling machine 1, the sampling mechanism 2, the screw conveyor 3, and the bucket elevator 6 are all electrically connected to the controller, and the controller can control the sampling machine 1, the sampling mechanism 2, the screw conveyor 3, and the bucket elevator 6 to stop according to a detection result of the first overload protection sensor and/or the second overload protection sensor.

Wherein, in this embodiment, first overload protection sensor can detect screw conveyer 3 and whether overload operation, and second overload protection sensor can detect bucket and carry 6 and whether overload operation, if screw conveyer 3 or bucket carry 6 and appear overload operation, then the controller can be shut down sampling machine 1, system appearance mechanism 2, screw conveyer 3 and bucket carry 6 to avoid appearing the problem of chute blockage and equipment damage.

In some examples, the controller may be a PLC controller, through which automatic protection may be implemented, or a manual program operation may be performed.

The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A sampling system of coal as fired is characterized by comprising a sampling machine, a sample preparation mechanism and a residual coal recovery mechanism;

the feed inlet of system appearance mechanism with the discharge gate of sampling machine is connected, surplus coal recovery mechanism includes that first material receiving part, second connect material part and screw conveyer, first material receiving part connect in screw conveyer, first material receiving part keeps away from screw conveyer's one end is used for connecing get the surplus coal that system appearance mechanism produced and the surplus coal that will connect get leading-in extremely screw conveyer, the second connect material part connect in first material receiving part, the second connects material receiving part to keep away from the one end of first material receiving part is used for connecing the surplus coal that artifical system appearance produced.

2. The sampling system of coal as fired according to claim 1, wherein the sample preparation mechanism comprises a sample collector and a scraping splitter, the sample collector has a sample outlet and a residual coal outlet, the scraping splitter has a first discharge port and a second discharge port, the first discharge port of the scraping splitter is connected to the feed inlet of the sample collector, and the first material receiving component is used for receiving coal discharged from the second discharge port of the scraping splitter and coal discharged from the residual coal outlet of the sample collector.

3. The sampling system of as-fired coal as defined in claim 2, wherein the first receiving component includes a first receiving hopper, a second receiving hopper and a guide tube, the first receiving hopper is connected to a feed port of the screw conveyor, the screw conveyor is located below the sample preparation mechanism, the first receiving hopper is located below the residual coal outlet of the sample collector, so that the coal discharged from the residual coal outlet of the sample collector falls to the first receiving hopper, the guide tube is vertically arranged, the second receiving hopper is connected to the top of the guide tube, the bottom of the guide tube is connected to the screw conveyor, and the second receiving hopper is located below a second discharge port of the scraping and sweeping type divider, so that the coal discharged from the second discharge port of the scraping and sweeping type divider falls to the second receiving hopper.

4. The sampling system of coal as fired according to claim 2, wherein the sample preparation mechanism further comprises a crusher and a blanking pipe, the blanking pipe is vertically arranged, the top of the blanking pipe is connected with the discharge hole of the sampling machine, the feed inlet of the crusher is connected with the bottom of the blanking pipe, and the discharge hole of the crusher is connected with the feed inlet of the scraping type divider.

5. The sampling system of coal as fired according to claim 1, wherein the second receiving part comprises a third receiving hopper and a connecting pipe, the connecting pipe is vertically arranged, the third receiving hopper is connected to the top of the connecting pipe, the third receiving hopper is used for receiving residual coal produced by artificial sampling, and the bottom of the connecting pipe is connected with the first receiving part.

6. The sampling system of coal as fired according to any one of claims 1 to 5, characterized in that the residual coal recovery mechanism further comprises a bucket elevator and a connecting conveying pipe, the connecting conveying pipe is connected to a feeding end of the bucket elevator, one end of the connecting conveying pipe, which is far away from the bucket elevator, is connected with a discharge port of the screw conveyor, and the bucket elevator is used for conveying coal to the coal as fired conveying belt.

7. The coal as fired sampling system of claim 6, wherein the feed end of the hopper lift is at a lower level than the discharge port of the screw conveyor, and the connecting duct is provided to extend obliquely downward.

8. The coal as fired sampling system of claim 6, wherein the bucket elevator comprises a housing, a chain link, a driving mechanism and a plurality of closed-bottom conveying hoppers, wherein an inlet is formed in one side of the bottom of the housing, an outlet is formed in the other side of the top of the housing, the chain link is rotatably connected in the housing and is in transmission connection with the driving end of the driving mechanism, the driving mechanism is used for driving the chain link to rotate, and each conveying hopper is connected to the chain link.

9. The coal as fired sampling system of claim 8, characterized in that the number of the conveying hoppers is 90-110, and the width of the mouth of the conveying hopper is 10-11 cm.

10. The sampling system of as-fired coal as defined in claim 6, wherein the residual coal recovery mechanism further comprises a controller, a first overload protection sensor and a second overload protection sensor, the first overload protection sensor is connected to the screw conveyor, the second overload protection sensor is connected to the bucket elevator, the first overload protection sensor and the second overload protection sensor are electrically connected to the controller, the sampling machine, the sample preparation mechanism, the screw conveyor and the bucket elevator are electrically connected to the controller, and the controller is capable of controlling the sampling machine, the sample preparation mechanism, the screw conveyor and the bucket elevator to stop according to a detection result of the first overload protection sensor and/or the second overload protection sensor.

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