A belt sampler front breaking device and belt sampler

Abstract

The application discloses a belt sampler pre-crushing device and a belt sampler, the belt sampler pre-crushing device is installed between a sampling head and a material falling pipe of a belt sampler, and comprises a feeding hopper, a shell, a crushing assembly, a monitoring assembly and a discharging port, the feeding hopper is connected to a discharging end of the sampling head and used for receiving coal samples falling from the sampling head, a lower end of the feeding hopper is connected with the shell, the crushing assembly is arranged in the shell, the crushing assembly is used for crushing the coal samples falling into the shell from the feeding hopper, the monitoring assembly is arranged in the shell and below the crushing assembly, the monitoring assembly can monitor the blocking state of the coal samples falling after being crushed by the crushing assembly in real time, and the bottom end of the shell is the discharging port and used for being connected with a feeding end of the material falling pipe; the device provided by the application is installed in front of the material falling pipe, so that the coal samples can be crushed to below a preset particle size by the crushing assembly before entering the material falling pipe, and the continuity of the raw coal sampling process is ensured.

Description

Technical Field

[0001] This application relates to the field of thermal power generation technology, and more specifically, to a pre-crushing device for a belt sampler and a belt sampler. Background Technology

[0002] In actual thermal power generation, raw coal generally contains large particles, and the particle size of coal samples is uneven. However, the diameter of the feed pipe is limited, and the internal height of the primary feed belt is also limited. When large coal samples enter the feed pipe directly, they are very likely to get stuck on the inner wall of the feed pipe or at the connection between the pipe and the primary feed belt, causing pipe blockage. After the pipe is blocked, the machine needs to be stopped for manual cleaning, which not only affects the continuity of sampling but also delays the progress of coal quality testing and increases the cost of manual operation and maintenance. At the same time, forcibly conveying large coal samples can also damage the primary feed belt and the onboard crusher, creating safety hazards during operation.

[0003] In conclusion, ensuring the continuity of the raw coal sampling process and reducing safety hazards are problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a pre-crushing device for a belt sampler and a belt sampler to ensure the continuity of the raw coal sampling process and reduce safety hazards.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A pre-crushing device for a belt sampler, installed between the sampling head and the discharge pipe of the belt sampler, includes: a feed hopper connected to the discharge end of the sampling head and used to receive coal samples falling from the sampling head; a housing connected to the discharge end of the feed hopper, the housing containing a crushing component for crushing the coal sample; a monitoring component for monitoring the blockage status of the coal sample after crushing by the crushing component and providing an alert; and a discharge port located at the bottom of the housing, the discharge port being used to connect to the feed end of the discharge pipe; wherein the feed hopper, the crushing component, the monitoring component, and the discharge port are distributed sequentially along the discharge direction of the coal sample.

[0007] In some embodiments, the crushing assembly includes an active toothed roller and a driven toothed roller; both ends of the active toothed roller and the driven toothed roller are rotatably connected to the inside of the housing via bearings, and one end of the active toothed roller is connected to a drive motor, which is mounted on the outside of the housing.

[0008] In some embodiments, the axes of the driving toothed roller and the driven toothed roller are parallel, and a crushing zone is formed between the driving toothed roller and the driven toothed roller; one end of the driving toothed roller is coaxially connected to a driving gear, and one end of the driven toothed roller is coaxially connected to a driven gear that meshes with the driving gear, so that the driving toothed roller and the driven toothed roller rotate relative to each other to crush the coal sample.

[0009] In some embodiments, the surfaces of both the active toothed roller and the driven toothed roller are provided with wear-resistant crushing teeth; horizontal grooves are respectively opened on the opposite side plates of the housing, and the bearing seats at both ends of the driven toothed roller are slidably assembled in the corresponding horizontal grooves. The housing is also provided with an adjustment component for driving the bearing seats to move along the horizontal grooves to adjust the distance between the active toothed roller and the driven toothed roller so as to crush the coal sample to 20mm-30mm.

[0010] In some embodiments, the adjusting assembly includes an adjusting seat fixed to the side plate of the housing and an adjusting bolt threadedly engaged with the adjusting seat. The end of the adjusting bolt abuts against the bearing seat of the driven toothed roller to push the bearing seat to move within the horizontal groove.

[0011] In some embodiments, the monitoring component includes a level sensor, an audible and visual alarm, and a controller; the level sensor is disposed within the housing and located between the crushing component and the discharge port, for monitoring the accumulation height of the coal sample; the controller is electrically connected to the level sensor, the audible and visual alarm, and the drive motor of the crushing component, and is configured to, upon receiving an accumulation signal output by the level sensor, control the audible and visual alarm to issue an alarm and control the drive motor to stop operating.

[0012] In some embodiments, an arc-shaped screen plate is also installed inside the housing, and the arc-shaped screen plate is installed below the active toothed roller and the driven toothed roller; the arc-shaped screen plate has a plurality of screen holes with preset apertures so that coal samples with a particle size smaller than the preset aperture after crushing can pass through and fall to the discharge port, and coal samples with a particle size larger than the preset aperture are picked up again by the active toothed roller or the driven toothed roller and subjected to secondary crushing.

[0013] In some embodiments, the feed hopper has a conical structure that is wider at the top and narrower at the bottom; the larger diameter end of the feed hopper is used to connect to the sampling head, and the smaller diameter end of the feed hopper is connected to the housing.

[0014] In some embodiments, the discharge port is provided with a connecting flange, which is used for detachable and fixed connection with the discharge pipe.

[0015] A belt sampler includes a pre-crushing device as described above; the belt sampler has a built-in crusher so that the coal sample is crushed step by step by passing through the crushing components and the crusher.

[0016] The pre-crushing device for a belt conveyor sampler provided in this application is installed between the sampling head and the discharge pipe of the belt conveyor sampler. It is used to pre-crush the coal sample before it enters the discharge pipe to eliminate the risk of blockage by large pieces of material. Specifically, the device includes a feed hopper, a shell, a crushing assembly, a monitoring assembly, and a discharge port. The feed hopper is connected to the discharge end of the sampling head and is used to receive the coal sample intercepted and falling from the coal conveyor belt. The lower end of the feed hopper is connected to the shell, and the crushing assembly is installed inside the shell. The crushing assembly is used to crush the coal sample falling from the feed hopper into the shell, removing large pieces of coal. The coal sample is crushed to a preset particle size to allow it to pass smoothly through the subsequent feed pipe. A monitoring component is installed inside the housing and below the crushing component to monitor the blockage status of the coal sample falling after being crushed by the crushing component in real time. The bottom of the housing is the discharge port, which is used to connect with the feed end of the feed pipe. By installing the device provided in this application before the feed pipe, the coal sample can be pre-crushed to a preset particle size by the crushing component before entering the feed pipe, which can alleviate the problem of large coal samples blocking the pipe, and at the same time protect the primary feed belt and subsequent self-contained crusher and other equipment, reducing safety hazards. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the pre-crushing device for the belt sampler provided in the embodiments of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the crushing component provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the structure of the monitoring component provided in an embodiment of this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100 - Feed hopper;

[0023] 200 - Housing;

[0024] 300 - Crushing assembly, 310 - Driven toothed roller, 320 - Driven toothed roller, 330 - Drive motor;

[0025] 400 - Monitoring components; 410 - Level sensor; 420 - Audible and visual alarm.

[0026] 500 - Connection flange;

[0027] 600 - Feed pipe. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, "one or more" refers to one, two, or more; "and / or" describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0030] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0031] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0032] The terms "parallel" and "perpendicular" used in this application refer to "basically parallel" and "basically perpendicular" in practical operation. "Basically parallel" can be understood as parallelism with a certain degree of error, and similarly, "basically perpendicular" can be understood as perpendicularity with a certain degree of error.

[0033] like Figure 1 As shown in the embodiment of this application, the pre-crushing device for a belt conveyor sampler is installed between the sampling head and the discharge pipe 600 of the belt conveyor sampler. It is used to pre-crush the coal sample before it enters the discharge pipe 600 to eliminate the risk of blockage by large pieces of material. Specifically, the device includes a feed hopper 100, a shell 200, a crushing component 300, a monitoring component 400, and a discharge port. The feed hopper 100 is connected to the discharge end of the sampling head and is used to receive the coal sample intercepted and falling from the coal conveyor belt. The lower end of the feed hopper 100 is connected to the shell 200, and the crushing component 300 is disposed inside the shell 200. The crushing component 300 is used to crush the coal sample falling from the feed hopper 100 into the shell 200. The device crushes large coal samples to below a preset particle size, allowing them to pass smoothly through the subsequent feed pipe 600. A monitoring component 400 is installed inside the housing 200 and below the crushing component 300 to monitor the blockage status of the falling coal sample after crushing by the crushing component 300 in real time. The bottom of the housing 200 is the discharge port, used to connect with the feed end of the feed pipe 600. By installing the device provided in this application before the feed pipe 600, the coal sample can be pre-crushed to below a preset particle size by the crushing component 300 before entering the feed pipe 600, alleviating the problem of large coal samples blocking the pipe, while protecting the primary feed belt and subsequent self-contained crusher, reducing safety hazards.

[0034] like Figure 2 As shown, the crushing assembly 300 includes a driving toothed roller 310 and a driven toothed roller 320, both housed inside the housing 200. Both ends of the driving toothed roller 310 and the driven toothed roller 320 are rotatably connected to the inner wall of the housing 200 via bearings, allowing the driving toothed roller 310 and the driven toothed roller 320 to rotate freely around their respective axes. One end of the driving toothed roller 310 is connected to a drive motor 330, which is fixedly mounted on the outer wall of the housing 200. The drive motor 330 serves as a power source, driving the driving toothed roller 310 to rotate, thereby causing the driven toothed roller 320 to rotate synchronously.

[0035] When the coal sample falls from the feed hopper 100 into the shell 200 and enters the area between the active toothed roller 310 and the driven toothed roller 320, the active toothed roller 310 and the driven toothed roller 320 rotate relative to each other to squeeze, shear and crush the coal sample, breaking large pieces of coal sample to below the preset particle size.

[0036] By placing the drive motor 330 externally within the housing 200, coal dust, water vapor, and other contaminants can be effectively prevented from entering the drive motor 330, ensuring stable operation of the drive motor 330 in the harsh environment of the sampling site. This also facilitates routine inspection and maintenance of the motor. The driving toothed roller 310 and the driven toothed roller 320 are installed using a bearing-driven rotating connection, resulting in low rotational resistance and smooth operation, providing reliable mechanical support for the continuous crushing of coal samples.

[0037] Specifically, such as Figure 2 As shown, the axes of the driving toothed roller 310 and the driven toothed roller 320 are arranged parallel to each other, forming a crushing zone between them for accommodating and crushing coal samples. To achieve synchronous relative rotation between the driving toothed roller 310 and the driven toothed roller 320, a driving gear is coaxially connected to one end of the driving toothed roller 310, and a driven gear is coaxially connected to one end of the driven toothed roller 320. The driving gear and the driven gear mesh with each other.

[0038] When the drive motor 330 drives the active toothed roller 310 to rotate, the coaxially connected active gear rotates synchronously and drives the driven gear to rotate in the opposite direction through gear meshing, thereby causing the driven toothed roller 320 and the active toothed roller 310 to rotate relative to each other at the same speed and in opposite directions. After the coal sample falls into the crushing zone from the feed hopper 100, it is rolled into the space between the teeth of the two relatively rotating toothed rollers and subjected to compression, shearing and grinding actions, thereby crushing large pieces of coal.

[0039] Furthermore, both the driving toothed roller 310 and the driven toothed roller 320 are provided with wear-resistant crushing teeth on their surfaces. These teeth are spaced apart along the circumference of the rollers and are used to directly contact and crush the coal sample. The wear-resistant crushing teeth enhance the gripping and biting ability of the driving toothed roller 310 and the driven toothed roller 320 on the coal sample, improving crushing efficiency. At the same time, their high wear resistance can effectively extend the service life of the rollers in continuous crushing operations and reduce the frequency of replacement and maintenance.

[0040] To achieve flexible control over the particle size of the crushed coal sample, horizontal grooves are respectively provided on the opposite side plates of the housing 200, and the bearing seats at both ends of the driven toothed roller 320 are slidably assembled into the corresponding horizontal grooves. An adjustment assembly is also provided on the housing 200, which drives the bearing seats to move along the horizontal grooves, thereby changing the distance between the driven toothed roller 320 and the driving toothed roller 310. When a smaller coal sample size is required, the adjustment assembly pushes the bearing seats towards the driving toothed roller 310, reducing the distance between the two rollers, narrowing the crushing zone, and allowing the coal sample to undergo more thorough compression and crushing. When the coal sample has a larger hardness or larger size, requiring a greater throughput, the adjustment can be reversed to increase the distance.

[0041] By coordinating the horizontal chute with the adjusting components, the crushing spacing can be flexibly adjusted according to changes in coal quality and the diameter requirements of the subsequent discharge pipe 600, ensuring that the output particle size is always within a safe range for easy conveying and preventing large pieces of material from entering the discharge pipe 600 and causing blockages. At the same time, the adjustable spacing design allows the same equipment to adapt to particle size requirements under different working conditions, improving the versatility and adaptability of the device.

[0042] Specifically, the adjusting assembly includes an adjusting seat and an adjusting bolt. The adjusting seat is fixed to the side plate of the housing 200, and a threaded hole is provided on the adjusting seat, with the adjusting bolt threaded into the hole. The end of the adjusting bolt passes through the adjusting seat and abuts against the bearing seat of the driven toothed roller 320.

[0043] When the crushing distance needs to be adjusted, rotate the adjusting bolt. The adjusting bolt moves axially under the action of its threaded engagement, and its end pushes the bearing seat of the driven toothed roller 320 to slide within the horizontal groove, thereby changing the center distance between the driven toothed roller 320 and the driving toothed roller 310. After adjustment, the adjusting bolt is fixed in position by its threaded self-locking mechanism, ensuring that the crushing distance will not shift due to vibration during operation.

[0044] like Figure 3 As shown, the monitoring component 400 includes a level sensor 410, an audible and visual alarm 420, and a controller.

[0045] The material level sensor 410 is installed inside the housing 200 and located between the crushing component 300 and the discharge port. This installation position is on the necessary channel for the crushed coal sample to fall, and it can directly sense the accumulation of the coal sample above the discharge port. The material level sensor 410 is used to monitor the accumulation height of the coal sample. When the crushed coal sample is not discharged smoothly and gradually accumulates above the discharge port and triggers the material level sensor 410, it indicates that the discharge speed in the discharge pipe 600 is lagging behind the discharge speed of the crushing component 300, and there is a risk of blockage.

[0046] The controller is electrically connected to the level sensor 410, the audible and visual alarm 420, and the drive motor 330 of the crushing assembly 300. The controller is configured to immediately perform two protective actions upon receiving an accumulation signal from the level sensor 410: first, to control the audible and visual alarm 420 to issue an audible and visual alarm, alerting on-site operators to the abnormal material blockage; second, to control the drive motor 330 to stop operating, causing the crushing assembly 300 to suspend operation and cease feeding material to the discharge end where accumulation has occurred.

[0047] By installing the level sensor 410 between the crushing component 300 and the discharge port, the initial trend of coal sample accumulation can be accurately captured. An early warning is issued and the machine automatically shuts down before the blockage is fully formed, thus proactively preventing material blockage. The immediate warning function of the audible and visual alarm 420 allows operators to quickly locate the problem and clear it in time, avoiding serious blockages caused by delayed detection. The controller automatically stops the drive motor 330, fundamentally preventing the crushing component 300 from forcibly feeding material when the discharge is obstructed. This effectively protects the crushing component 300 and drive motor 330 from overload damage and also prevents excessive accumulation of coal sample in the shell 200, which would increase the difficulty of cleaning. The entire monitoring component 400 achieves closed-loop protection control of material blockage monitoring, alarm prompts, and automatic shutdown, significantly improving the safety and automation level of the equipment operation and reducing manual intervention and downtime caused by pipe blockage.

[0048] In some embodiments, to further ensure the coal sample crushing effect, an arc-shaped screen plate is also installed inside the housing 200, which is located below the active toothed roller 310 and the driven toothed roller 320. The arc-shaped screen plate is an arc shape adapted to the outer contour of the toothed roller, with its concave surface facing the crushing assembly 300, and is used to receive the coal sample falling after being crushed by the active toothed roller 310 and the driven toothed roller 320.

[0049] The arc-shaped screen plate has multiple pre-set apertures, the aperture size of which is set according to the diameter of the discharge pipe 600 and the throughput capacity of the subsequent conveying equipment. When the crushed coal sample falls onto the arc-shaped screen plate, coal samples with a particle size smaller than the pre-set aperture pass directly through the apertures to the discharge port below and enter the discharge pipe 600 for further conveying, while coal samples with a particle size larger than the pre-set aperture are intercepted on the upper surface of the arc-shaped screen plate. As the driving toothed roller 310 and the driven toothed roller 320 continue to rotate, the wear-resistant crushing teeth on the surface of the rollers, when passing through the arc-shaped screen plate area, pick up the intercepted large coal particles again and re-roll them into the crushing zone between the driving toothed roller 310 and the driven toothed roller 320 for secondary crushing. This cycle continues until the coal sample particle size is reduced to a size that can pass through the apertures.

[0050] By setting up an arc-shaped screen plate, forced screening of the crushed coal sample can be achieved, ensuring that only coal samples with qualified particle sizes can enter the feed pipe 600, fundamentally eliminating the risk of large pieces of material entering subsequent pipelines. The circulating crushing mechanism formed by the arc-shaped screen plate and toothed rollers allows large coal particles that do not meet the standards to automatically return to the crushing zone for further crushing without manual intervention, improving crushing efficiency and ensuring the uniformity and consistency of the output particle size. At the same time, the screen aperture of the arc-shaped screen plate can be selected according to actual needs, allowing the device to flexibly adapt to the different requirements of output particle size under different working conditions, further enhancing the versatility and anti-clogging reliability of the device.

[0051] In this application, such as Figure 1 As shown, the feed hopper 100 has a conical structure that is wider at the top and narrower at the bottom. The larger diameter end at the top is used to connect to the discharge end of the sampling head, and the smaller diameter end at the bottom is connected to the top feed inlet of the housing 200. When the sampling head intercepts and releases a coal sample from the coal conveyor belt, the coal sample first falls into the opening at the larger diameter end of the feed hopper 100.

[0052] Because the feed hopper 100 adopts a conical design that is wider at the top and narrower at the bottom, its larger upper opening can effectively receive the coal sample released by the sampling head. Even if there is a certain positional deviation of the sampling head at the moment of release or the coal sample scatters over a large area, the conical flaring structure can ensure that the coal sample is reliably collected and prevent the coal sample from overflowing and spilling outside the device. After the coal sample enters the feed hopper 100, it slides down the inner wall of the cone under the action of gravity, and gradually gathers towards the center during the falling process, and finally enters the crushing component 300 area inside the shell 200 through the small diameter end.

[0053] The conical feed hopper 100 serves two purposes. First, its material collection and guiding function accurately guides the coal sample collected by the sampling head into the crushing zone of the crushing component 300, preventing the coal sample from falling unevenly within the shell 200 and causing uneven crushing or leakage. Second, its simple and compact structure requires no additional power or moving parts; it relies solely on the gravity of the coal sample to complete material collection and guidance, ensuring reliable operation and zero maintenance costs. Furthermore, the smooth transition of the conical inner wall allows the coal sample to fall smoothly, preventing it from adhering to or accumulating on the inner wall of the feed hopper 100, thus ensuring continuous unobstructed flow in the feeding channel.

[0054] like Figure 1 As shown, the discharge port is located at the bottom of the housing 200, and is used to discharge the crushed coal sample with qualified particle size and guide it into the feed pipe 600. To facilitate a reliable connection between the discharge port and the feed pipe 600, a connecting flange 500 is provided at the discharge port.

[0055] The connecting flange 500 is fixed to the outer periphery of the discharge port, and a corresponding flange is provided at the feed end of the discharge pipe 600. During installation, the connecting flange 500 is mated with the flange of the discharge pipe 600, and the two are detachably fixedly connected by bolts or other fasteners. When the device needs to be inspected, cleaned, or replaced, only the fasteners on the connecting flange 500 need to be removed to detach the entire pre-crushing device from the discharge pipe 600, making the operation simple and quick.

[0056] The belt sampler pre-crushing device provided in this embodiment of the application, by pre-installing the crushing component 300 between the sampling head and the discharge pipe 600, allows the coal sample to be crushed before entering the discharge pipe 600 with a limited diameter, thus alleviating the phenomenon of large coal samples clogging the discharge pipe. Through the conical material collection guide of the feed hopper 100, the roller crushing of the active toothed roller 310 and the driven toothed roller 320, the material blockage warning and automatic shutdown protection of the monitoring component 400, and the detachable connection of the discharge port connecting flange 500, a complete closed-loop control from coal sample receiving, crushing, status monitoring to discharge and conveying is realized. Furthermore, through the adjustable toothed roller spacing and the circulating screening of the arc-shaped screen plate, the output particle size is accurately controllable, ensuring that the coal sample entering the discharge pipe has a uniform particle size and meets the conveying requirements. The entire device is compact in structure and reliable in operation. It can effectively avoid downtime for cleaning due to pipe blockage, ensure the continuity of sampling, reduce manual operation and maintenance costs, protect subsequent conveyor belts and crushers, reduce safety hazards, and significantly improve the stability and automation level of the raw coal sampling system in thermal power plants.

[0057] This application also provides a belt sampling machine, which includes the belt sampling machine pre-crushing device in the above embodiments.

[0058] Since the aforementioned pre-crushing device for the belt sampler has the above-mentioned technical effects, and the belt sampler includes the aforementioned pre-crushing device for the belt sampler, the belt sampler also has the corresponding technical effects, which will not be elaborated here.

[0059] Specifically, the belt sampler incorporates a crusher, allowing coal samples to be gradually crushed by passing through the crushing assembly 300 and the crusher sequentially. Through the coordinated primary and secondary crushing, the large single crushing ratio is broken down into two moderate crushing ratios, effectively reducing the workload and impact load of each crushing assembly. The pre-crushing device intercepts and processes large coal samples, preventing blockages caused by large materials directly entering the feed pipe 600 and ensuring the continuity of sampling operations. The built-in crusher operates under relatively stable feed particle size conditions, resulting in higher crushing efficiency and more uniform output particle size, while significantly reducing equipment wear and the risk of failure. The entire belt sampler, through the organic combination of pre-crushing and built-in crushing, achieves a smooth connection from sampling to analysis and sample preparation, significantly improving the operational reliability and automation of the raw coal sampling system, reducing downtime maintenance costs due to pipe blockages and equipment failures, and ensuring the timeliness and accuracy of coal quality analysis data.

[0060] The above description of the embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pre-crushing device for a belt sampler, installed between the sampling head and the discharge pipe (600) of the belt sampler, characterized in that, include: A feed hopper (100) is connected to the discharge end of the sampling head and is used to receive the coal sample falling from the sampling head; A housing (200) is connected to the discharge end of the feed hopper (100), and a crushing assembly (300) is disposed inside the housing (200) for crushing the coal sample; A monitoring component (400) is used to monitor the blockage status of the coal sample after it has been crushed by the crushing component (300) and to issue a warning. The discharge port is located at the bottom end of the housing (200) and is used to connect to the feed end of the discharge pipe (600); The feed hopper (100), the crushing component (300), the monitoring component (400), and the discharge port are distributed sequentially along the discharge direction of the coal sample.

2. The pre-crushing device for the belt sampler according to claim 1, characterized in that, The crushing assembly (300) includes a drive toothed roller (310) and a driven toothed roller (320). Both ends of the active toothed roller (310) and the driven toothed roller (320) are rotatably connected to the inside of the housing (200) via bearings. One end of the active toothed roller (310) is connected to a drive motor (330), which is installed on the outside of the housing (200).

3. The pre-crushing device for the belt sampler according to claim 2, characterized in that, The axes of the active toothed roller (310) and the driven toothed roller (320) are parallel, and a crushing zone is formed between the active toothed roller (310) and the driven toothed roller (320); One end of the active toothed roller (310) is coaxially connected to an active gear, and one end of the driven toothed roller (320) is coaxially connected to a driven gear that meshes with the active gear, so that the active toothed roller (310) and the driven toothed roller (320) rotate relative to each other to crush the coal sample.

4. The pre-crushing device for the belt sampler according to claim 2, characterized in that, The surfaces of both the driving toothed roller (310) and the driven toothed roller (320) are provided with wear-resistant breaking teeth; The housing (200) has horizontal grooves on its opposite side plates. The bearing seats at both ends of the driven toothed roller (320) are slidably assembled in the corresponding horizontal grooves. The housing (200) is also provided with an adjustment component for driving the bearing seats to move along the horizontal grooves to adjust the distance between the driving toothed roller (310) and the driven toothed roller (320) so as to crush the coal sample to 20mm-30mm.

5. The pre-crushing device for the belt sampler according to claim 4, characterized in that, The adjustment assembly includes an adjustment seat fixed to the side plate of the housing (200) and an adjustment bolt threadedly engaged with the adjustment seat. The end of the adjustment bolt abuts against the bearing seat of the driven toothed roller (320) to push the bearing seat to move within the horizontal groove.

6. The pre-crushing device for the belt sampler according to claim 1, characterized in that, The monitoring component (400) includes a level sensor (410), an audible and visual alarm (420), and a controller; The material level sensor (410) is disposed inside the housing (200) and is located between the crushing component (300) and the discharge port, for monitoring the accumulation height of the coal sample; The controller is electrically connected to the material level sensor (410), the audible and visual alarm (420), and the drive motor (330) of the crushing component (300). The controller is configured to control the audible and visual alarm (420) to issue an alarm and control the drive motor (330) to stop operating when it receives an accumulation signal output by the material level sensor (410).

7. The pre-crushing device for the belt sampler according to claim 2, characterized in that, An arc-shaped screen plate is also installed inside the housing (200), and the arc-shaped screen plate is installed below the driving toothed roller (310) and the driven toothed roller (320); The arc-shaped screen plate has multiple screen holes with preset apertures so that coal samples with a particle size smaller than the preset aperture after crushing can pass through and fall to the discharge port, while coal samples with a particle size larger than the preset aperture are picked up again by the active toothed roller (310) or the driven toothed roller (320) and subjected to secondary crushing.

8. The pre-crushing device for the belt sampler according to claim 1, characterized in that, The feed hopper (100) has a conical structure that is wider at the top and narrower at the bottom; The large-diameter end of the feed hopper (100) is used to connect the sampling head, and the small-diameter end of the feed hopper (100) is connected to the housing (200).

9. The pre-crushing device for the belt sampler according to claim 1, characterized in that, The discharge port is provided with a connecting flange (500), which is used to detachably and fixedly connect to the discharge pipe (600).

10. A belt sampling machine, characterized in that, Includes the pre-crushing device for the belt sampler as described in any one of claims 1-9; The belt sampler has a built-in crusher so that the coal sample is crushed step by step by passing through the crushing assembly (300) and the crusher.

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