Coal sample pre-crushing device for rapidly detecting coal quality and operation method

Abstract

The invention relates to a coal sample pre-crushing device suitable for rapid coal quality detection and an operation method. The coal sample pre-crushing device comprises a rack; a box body; the at least two crushing roller sets are sequentially arranged in the gravity direction, and each crushing roller set comprises a positioning roller and a sliding roller which are oppositely arranged; the positioning roller is mounted at a preset position of the box body, and the sliding roller is mounted in a sliding manner relative to the box body; the adjusting mechanism is connected with the sliding roller so as to adjust the distance between the sliding roller and the positioning roller which is arranged opposite to the sliding roller; the driving assembly is connected with at least one of the positioning rollers and is also connected with at least one of the sliding rollers; the driven assembly is used for driving the positioning roller and the sliding roller to rotate synchronously, and the device has the advantages that the crushing efficiency is improved, and the situation that the detection precision is affected due to the fact that the characteristics of a coal sample are damaged (such as moisture loss) is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of coal sample crushing in the process of rapid coal quality detection, and in particular to a coal sample pre-crushing device and method for rapid coal quality detection. Background Art

[0002] Coal is an inhomogeneous substance (particle size, quality characteristics distribution, etc.). Before analyzing the coal quality, it is usually necessary to sample and prepare the coal. Sampling is usually to extract a representative sample that can represent the quality and characteristics of the entire parent material from the sampled parent material as much as possible. Sample preparation is to prepare the sample obtained by sampling to ensure that the sample particle size is gradually reduced without destroying the representativeness of the sample, and the quality is gradually reduced until it meets the particle size and quality (weight) requirements of the laboratory test. Sample preparation usually includes air drying, crushing, reduction, grinding and other processes. Among them, crushing is the process of reducing the sample particle size, which is usually achieved with the help of crushing machinery.

[0003] The existing coal sample preparation link crushers can be divided into crushers for general coal sample crushing to a nominal maximum particle size of 13mm, crushers such as hammer crushers for crushing a nominal maximum particle size of 13mm to a nominal maximum particle size of 6mm, crushers such as double-roll crushers for crushing a nominal maximum particle size of 6mm to a nominal maximum particle size of 3mm, and crushers such as grinders for crushing a nominal maximum particle size of 3mm to a nominal maximum particle size of 1mm or 0.2mm. Due to the different crushing particle size ranges applicable to different equipment, if the crushing particle size range is expanded, for example, directly crushing a 13mm sample to a 3mm coal sample, it is easy to cause large particles of material to float between the rollers, resulting in blockage or bridging. Therefore, in the actual crushing process, the sample needs to be transported in different crushing equipment, which will lead to low sample crushing efficiency, long retention time in the crushing process, and damage to the characteristics of the sample itself (such as water loss), which affects the detection accuracy. In addition, the equipment is also prone to blockage and other problems in the process of crushing coal, which further reduces the crushing efficiency.

[0004] A Chinese invention patent with publication number CN105413794B discloses a medium coal wet crusher with integrated coarse and fine crushing, which utilizes two sets of knife-ring type crushing rollers in the first crushing chamber and two sets of groove type crushing rollers in the second crushing chamber for crushing. However, the shape of the crushing rollers is prone to residual coal and is difficult to clean, which will affect the coal crushing efficiency to a certain extent. In addition, the crushing rollers use flushing water through flushing pipes to flush the residual coal in the crushing rollers, which has a special application scenario and is not suitable for coal quality detection scenarios. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a coal sample pre-crushing device and method for rapid coal quality detection.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A coal sample pre-crushing device suitable for rapid coal quality detection, comprising:

[0008] frame;

[0009] A box body is installed on the frame;

[0010] A crushing roller group, at least two groups arranged in sequence along the gravity direction, each group of the crushing roller group comprises a positioning roller and a sliding roller arranged oppositely; the positioning roller is installed at a preset position of the box body, and the sliding roller is installed to slide relative to the box body;

[0011] An adjusting mechanism connected to the sliding roller to adjust the distance between the sliding roller and the positioning roller arranged opposite thereto;

[0012] A driving assembly connected to at least one of the positioning rollers and also connected to at least one of the sliding rollers;

[0013] The driven assembly is provided with at least two groups, one of which is used to connect the positioning rollers of all the crushing roller groups so that all the positioning rollers rotate synchronously, and the other group is connected with the sliding rollers so that all the sliding rollers rotate synchronously.

[0014] Preferably, the sliding roller is slidingly mounted on the box body;

[0015] The adjustment mechanism comprises a connecting rod, a connecting plate, an adjustment shaft and an adjustment seat;

[0016] One end of the connecting rod is connected to the sliding roller, and the other end is connected to the connecting plate;

[0017] One end of the adjusting shaft is rotatably connected to the connecting plate, and the other end is threadedly connected to the adjusting seat;

[0018] The adjustment seat is installed on the frame and / or the box.

[0019] Preferably, only one adjusting mechanism is provided, or a plurality of adjusting mechanisms are provided, and the plurality of adjusting mechanisms are provided in one-to-one correspondence with the sliding rollers.

[0020] Preferably, the adjustment mechanism further comprises a scale plate;

[0021] One end of the scale plate is fixed on the box body, and the other end is against the end surface of the connecting plate. The scale on the scale plate is arranged along the sliding direction of the sliding roller.

[0022] Preferably, the drive assembly comprises a drive motor;

[0023] The coal sample pre-crushing device also includes a feeding belt conveyor for feeding the box body;

[0024] The feeding belt conveyor includes a controller and a conveyor belt. The controller is used to monitor the real-time current and rated current of the driving motor and to regulate the feeding speed of the conveyor belt.

[0025] Preferably, the crushing drum group comprises a lower crushing drum group;

[0026] The lower crushing roller group includes a first positioning roller and a first sliding roller;

[0027] The first positioning roller and the first sliding roller are both connected to the driving assembly.

[0028] Preferably, the driving assembly comprises a driving motor, a coupling, a first sprocket, a second sprocket, a tensioning wheel, a tensioning wheel seat, an auxiliary wheel and a first chain;

[0029] The power output shaft of the driving motor is connected to the rotating shaft of the first positioning roller through a coupling, and the first sprocket is fixedly mounted on the rotating shaft of the first positioning roller;

[0030] The second sprocket is fixedly mounted on the rotating shaft of the first sliding roller;

[0031] The tensioning wheel is installed on the frame through the tensioning wheel seat, and is used to adjust the tightness of the first chain;

[0032] The first chain connects the first sprocket, the second sprocket, the tensioning wheel and the auxiliary wheel.

[0033] Preferably, the crushing drum group comprises an upper crushing drum group;

[0034] The upper crushing roller group includes a second positioning roller and a second sliding roller;

[0035] The second positioning roller is connected to the first positioning roller through a set of driven components;

[0036] The second sliding roller is connected to the first sliding roller through another set of the driven components.

[0037] Preferably, the box body comprises an upper box body, a middle box body and a lower box body;

[0038] The upper box body, the middle box body and the lower box body enclose a crushing chamber, and a scraping plate is installed in the crushing chamber;

[0039] The scraping plates are arranged one by one with the positioning rollers, and a preset distance is formed between the corresponding positioning rollers;

[0040] The scraping plates are arranged in one-to-one correspondence with the sliding rollers, and a preset distance is formed between the corresponding sliding rollers.

[0041] An operating method of the above-mentioned coal sample pre-crushing device suitable for rapid coal quality detection comprises the following steps:

[0042] Put the coal sample with the preset maximum nominal particle size into the feeding belt conveyor, and start the coal sample pre-crushing device and the feeding belt conveyor;

[0043] The positioning drum of the crushing drum group and the sliding drum of the crushing drum group are driven to rotate relative to each other through the driving assembly and the driven assembly, so as to perform multi-stage crushing on the coal sample and form a coal sample of preset specifications;

[0044] The distance between the sliding roller and the positioning roller arranged opposite to it is adjusted by using the adjusting mechanism;

[0045] The controller of the feeding belt machine monitors the real-time current and rated current of the driving motor of the driving component, and adjusts the feeding speed of the conveyor belt of the feeding belt machine.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The above technical solution provides a coal sample pre-crushing device suitable for rapid coal quality detection. Through multiple groups of crushing rollers arranged along the gravity direction, on the one hand, it can realize continuous step-by-step crushing of coal materials, so that the interval time between at least two crushings is the shortest, reducing the coal flow distance between the two crushings, avoiding the loss of materials during the transfer process and the damage to the characteristics of the coal sample itself, such as reducing the moisture loss of the coal sample during the crushing process, and ensuring the consistency of the moisture of the coal sample during the detection process to the greatest extent, fully reflecting the true moisture value of the coal sample. On the other hand, multiple groups of crushing roller groups are arranged along the gravity direction, so that the coal material can be transferred between multiple groups of crushing roller groups without the help of external transfer equipment. While meeting the coal material crushing, it reduces the power of the coal sample pre-crushing device, reduces the volume of the coal sample pre-crushing device, and reduces the space occupied by the coal sample pre-crushing device, which is more suitable for the compact and efficient volume requirements of the coal quality rapid detection system. In addition, through the mutual cooperation of the driving component and the driven component, the synchronous operation of multiple groups of crushing roller groups can be realized, the stability of the operation of the coal sample pre-crushing device is increased, and the crushing efficiency and crushing effect are guaranteed. At the same time, the crushing roller group, the driving assembly, the driven assembly and the adjusting mechanism cooperate with each other, so that the adjusting mechanism can adjust the distance between the sliding roller and the positioning roller arranged opposite to it. On the one hand, the coal sample pre-crushing device can meet the crushing of coal samples with different particle sizes; on the other hand, by increasing the distance between the sliding roller and the positioning roller, the coal material can be prevented from being blocked after crushing, and the problem of wet coal and sticky coal blocking the screen plate holes of the traditional hammer crusher, causing the equipment to be blocked, and the subsequent process cannot be carried out. The coal sample pre-crushing device of this embodiment has a stronger adaptability to coal samples with different moisture content, avoids the problem of poor crushing efficiency and shutdown for maintenance caused by blockage during the crushing process, and further increases the crushing efficiency. Correspondingly, based on an operating method of a coal sample pre-crushing device suitable for rapid coal quality detection, it has the advantages of increasing crushing efficiency and avoiding damage to the characteristics of the coal sample itself (such as moisture loss) and affecting the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 It is a structural schematic diagram of an embodiment provided by the present invention.

[0050] Figure 2 yes Figure 1 Schematic diagram of the structure from another perspective.

[0051] Figure 3 yes Figure 2 Enlarged schematic diagram of position D in the middle.

[0052] Figure 4 yes Figure 1 Schematic diagram of the structure from another perspective.

[0053] Figure 5 yes Figure 4 Middle AA cross-sectional structure diagram (cross-sectional structure diagram of upper crushing drum)

[0054] Figure 6 yes Figure 4 Schematic diagram of the cross-sectional structure of the middle BB (cross-sectional structure diagram of the lower crushing drum).

[0055] Figure 7 It is a cross-sectional structural diagram of the present invention at the position of the box body and the scraper plate (excluding the feeding belt conveyor).

[0056] Description of reference numerals:

[0057] 1. Frame; 2. Box; 21. Upper box; 22. Middle box; 23. Lower box; 3. Crushing drum group; 31. Lower crushing drum group; 311. First positioning drum; 312. First sliding drum; 32. Upper crushing drum group; 321. Second positioning drum; 322. Second sliding drum; 4. Adjustment mechanism; 41. Connecting rod; 42. Connecting plate; 43. Adjustment shaft; 44. Adjustment seat; 45. Scale plate; 5. Drive Assembly; 51, driving motor; 52, coupling; 53, first sprocket; 54, second sprocket; 55, tensioning wheel; 56, tensioning wheel seat; 57, auxiliary wheel; 58, first chain; 6, driven assembly; 61, first driven assembly; 611, third sprocket; 612, fourth sprocket; 613, second chain; 62, second driven assembly; 7, feeding belt conveyor; 8, scraper plate; 81, first scraper plate; 82, second scraper plate. DETAILED DESCRIPTION

[0058] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] See also Figures 1 to 7 The embodiment of the present invention provides a coal sample pre-crushing device suitable for rapid coal quality detection, which includes a frame 1, a box 2, a crushing roller group 3, an adjustment mechanism 4, a driving assembly 5 and a driven assembly 6. Among them, the box 2 is installed on the frame 1; the crushing roller group 3 is at least two groups arranged in sequence along the gravity direction, and each group of crushing roller groups 3 includes a positioning roller and a sliding roller arranged oppositely; the positioning roller is installed at a preset position of the box 2, and the sliding roller is slidingly installed relative to the box 2; the adjustment mechanism 4 is connected to the sliding roller to adjust the distance between the sliding roller and the positioning roller arranged oppositely; the driving assembly 5 is connected to at least one of the positioning rollers and is also connected to at least one of the sliding rollers; the driven assembly 6 is provided with at least two groups, one of which is used to connect the positioning rollers of all the crushing roller groups 3 so that all the positioning rollers rotate synchronously, and the other group is connected to the sliding roller so that all the sliding rollers rotate synchronously.

[0062] In the above scheme, by sequentially setting at least two groups of crushing roller groups 3 along the direction of gravity, continuous step-by-step crushing of coal can be achieved, so that the interval time between at least two crushings is the shortest, the coal flow distance between the two crushings is reduced, and the loss in the material transfer process and the damage to the characteristics of the coal sample itself are avoided, such as reducing the moisture loss of the coal sample during the crushing process, and ensuring the consistency of the moisture of the coal sample during the detection process to the greatest extent, fully reflecting the true moisture value of the coal sample. At the same time, multiple groups of crushing roller groups 3 are arranged along the direction of gravity, so that the coal material can be transferred between multiple groups of crushing roller groups 3 without the aid of external transfer equipment. While meeting the coal material crushing, the power of the coal sample pre-crushing device is reduced, the volume of the coal sample pre-crushing device is reduced, and the space occupied by the coal sample pre-crushing device is reduced, which is more suitable for the compact and efficient volume requirements of the coal quality rapid detection system. Through the mutual cooperation of the driving component 5 and the driven component 6, the synchronous operation of multiple groups of crushing roller groups 3 can be achieved, the stability of the operation of the coal sample pre-crushing device is increased, and the crushing efficiency and crushing effect are guaranteed. At the same time, the crushing roller group 3, the driving assembly 5, the driven assembly 6 and the adjusting mechanism 4 cooperate with each other, so that the adjusting mechanism 4 can adjust the distance between the sliding roller and the positioning roller arranged opposite to it. On the one hand, the coal sample pre-crushing device can meet the crushing needs of coal samples with different particle sizes; on the other hand, by increasing the distance between the sliding roller and the positioning roller, blockage of the coal material after crushing can be avoided, which solves the problem of wet coal and sticky coal clogging the screen plate holes of the traditional hammer crusher, causing equipment blockage, and making it impossible to proceed with subsequent processes. The coal sample pre-crushing device of this embodiment has a stronger adaptability to coal samples with different moisture contents, avoids the problem of poor crushing efficiency and shutdown for maintenance caused by blockage during the crushing process, and further increases the crushing efficiency.

[0063] Specifically, in this embodiment, the housing 2 has a crushing cavity, the positioning roller is rotatably installed at a preset position of the housing 2, and the area of ​​the positioning roller used for coal crushing is located in the crushing cavity, and the rotating shaft of the positioning roller passes through the housing 2 and is connected to the driving assembly 5 and the driven assembly 6. Similarly, the area of ​​the sliding roller used for coal crushing is also located in the crushing cavity, and a crushing area is formed between the sliding roller and its corresponding positioning roller, and the rotating shaft of the sliding roller also passes through the housing 2 and is connected to the driving assembly 5 and the driven assembly 6. The difference is that the sliding roller is integrally slidably installed on the housing 2, and can then slide along the housing 2 under the adjustment of the adjustment mechanism 4 to adjust the distance between the sliding roller and its corresponding positioning roller.

[0064] It is worth noting that, in this embodiment, the rotating shaft of the positioning roller is mounted on the fixed bearing seat through a bearing, and the fixed bearing seat is fixedly mounted on the box body 2, thereby realizing a fixed connection between the positioning roller and the box body 2. Correspondingly, the sliding roller is mounted on the sliding bearing seat through another bearing, and the sliding bearing seat is slidably mounted on the box body 2, thereby realizing a sliding connection between the sliding roller and the box body 2.

[0065] Furthermore, the adjustment mechanism 4 includes a connecting rod 41, a connecting plate 42, an adjustment shaft 43 and an adjustment seat 44; one end of the connecting rod 41 is connected to the sliding roller, and the other end is connected to the connecting plate 42; one end of the adjustment shaft 43 is rotatably connected to the connecting plate 42, and the other end is threadedly connected to the adjustment seat 44; the adjustment seat 44 is installed on the frame 1 or the box body 2, and then the connecting plate 42, the connecting rod 41, and the sliding roller can be moved as a whole by rotating the adjustment shaft 43, thereby realizing the adjustment of the distance between the sliding roller and the corresponding positioning roller.

[0066] Furthermore, in order to achieve stable adjustment of the sliding roller, the connecting plate 42 can be connected to both ends of the sliding roller through two symmetrically arranged connecting rods 41.

[0067] Furthermore, the adjusting mechanism 4 is arranged in a one-to-one correspondence with the sliding roller. Of course, in other embodiments, only one adjusting mechanism 4 is arranged, which can adjust the distance between the sliding roller and its corresponding positioning roller.

[0068] In order to improve the accuracy of adjustment, in the present embodiment, the adjustment mechanism 4 also includes a scale plate 45; one end of the scale plate 45 is fixed on the box body 2, and the other end is against the end surface of the connecting plate 42. The scale on the scale plate 45 is arranged along the sliding direction of the sliding roller, so that the operator can know the size of the distance between the sliding roller and its corresponding positioning roller in real time, and then control the particle size after the sample is crushed.

[0069] In this embodiment, the crushing roller group 3 is provided with two groups, including a lower crushing roller group 31 and an upper crushing roller group 32, so that the multi-stage crushing of the coal sample can be realized in the coal sample pre-crushing device. Among them, the upper crushing roller group 32 is the primary crushing, and the coal after the primary crushing enters the lower crushing roller group 31 for secondary crushing, and then outputs the coal of preset specifications. It can be known that in other embodiments, the crushing roller group 3 can also be provided with three, four or more groups along the gravity direction.

[0070] Specifically, the lower crushing drum group 31 includes a first positioning drum 311 and a first sliding drum 312; the first positioning drum 311 and the first sliding drum 312 are both connected to the driving assembly 5. The upper crushing drum group 32 includes a second positioning drum 321 and a second sliding drum 322. The driven assembly 6 includes a first driven assembly 61 and a second driven assembly 62, wherein the second sliding drum 322 is connected to the first sliding drum 312 via the first driven assembly 61; the second positioning drum 321 is connected to the first positioning drum 311 via the second driven assembly 62.

[0071] Furthermore, the adjustment mechanism 4 is also provided with two groups, one group is used to drive the first sliding roller 312 to slide, and the other group is used to drive the second sliding roller 322 to slide.

[0072] Furthermore, in this embodiment, the adjustment mechanism 4 that drives the first sliding roller 312 to slide, and the corresponding adjustment seat 44 are fixedly installed on the frame 1. The adjustment mechanism 4 that drives the second sliding roller 322, and the corresponding adjustment seat 44 are fixedly installed on the box body 2. Of course, in other embodiments, the adjustment mechanism 4 that drives the second sliding roller 322, and the corresponding adjustment seat 44 can also be slidably installed on the box body 2, so that the second sliding roller 322 can be adjusted along the gravity direction, and then the distance between two adjacent sliding rollers can be adjusted, which is not shown in the figure.

[0073] The example of crushing a coal sample with a nominal maximum particle size of 13 mm to a coal sample with a nominal maximum particle size of no more than 3 mm is used for explanation. In this embodiment, when in use, the sliding roller (i.e., the second sliding roller 322) of the upper crushing roller group 32 is adjusted by the adjusting mechanism 4 so that the spacing between the positioning roller (i.e., the second positioning roller 321) of the upper crushing roller group 32 and the sliding roller (i.e., the second sliding roller 322) of the upper crushing roller group 32 is within the range of 4 to 6 mm, and at the same time, the sliding roller (i.e., the first sliding roller 312) of the lower crushing roller group 31 is adjusted by the adjusting mechanism 4 so that the spacing between the positioning roller (i.e., the first positioning roller 311) of the lower crushing roller group 31 and the sliding roller (i.e., the first sliding roller 312) of the lower crushing roller group 31 is within the range of 1 to 3 mm. After the coal is transported to the coal sample pre-crushing device, the coal sample with a nominal maximum particle size of 13 mm is first crushed to a coal sample with a particle size of 6 mm by the upper crushing roller group 32, and then the coal sample with a nominal maximum particle size of 6 mm is crushed to a coal sample with a particle size of 3 mm or less by the lower crushing roller group 31. The coal sample can be directly crushed from 13 mm to 3 mm or less by a coal sample pre-crushing device.

[0074] It is worth noting that the two sets of adjustment mechanisms 4 can be driven synchronously, and since the second sliding roller 322 is connected to the first sliding roller 312 through the first driven component 61, the first sliding roller 312 and the second sliding roller 322 can move synchronously, thereby facilitating the adjustment of the coal sample pre-crushing device.

[0075] Specifically, taking the driven component 6 (i.e., the first driven component 61) connecting the first sliding roller 312 and the second sliding roller 322 as an example, in this embodiment, the driven component 6 (the first driven component 61) includes a third sprocket 611, a fourth sprocket 612 and a second chain 613; the third sprocket 611 is connected to the upper crushing roller group 32, the fourth sprocket 612 is connected to the lower crushing roller group 31, and the second chain 613 connects the third sprocket 611 and the fourth sprocket 612, thereby enabling the synchronous operation of the first sliding roller 312 and the second sliding roller 322 to be achieved.

[0076] Furthermore, in order to satisfy the force coordination between the lower crushing drum group 31 and the upper crushing drum group 32 , the number of teeth of the third sprocket 611 is greater than the number of teeth of the fourth sprocket 612 .

[0077] Of course, in another embodiment, in order to achieve the adjustment of the first sliding roller 312 and the second sliding roller 322 respectively, and thus improve the crushing accuracy of the upper crushing roller group 32 and the lower crushing roller group 31, the two groups of adjustment mechanisms 4 can also be operated separately. At this time, the first sliding roller 312 and the second sliding roller 322 driven components 6 can be removed to achieve separate adjustment, and then the adapted driven components 6 are replaced (such as replacing the second chain 613 of different lengths); the driven component 6 can also be set as an adjustable mechanism itself, for example, the second chain 613 is connected to the third sprocket 611 and the fourth sprocket 612 in addition to connecting the second chain 613, and is also connected to an adjustment wheel, and the second chain 613 is adjusted by the adjustment wheel (so that the second chain 613 is tightened to meet the transmission) so that the central axis of the third sprocket 611 and the fourth sprocket 612 meets the actual needs, which is not shown in the figure. Of course, in another embodiment, a conveyor belt with a specific certain telescopic performance can also be used instead of the second chain 613 for transmission, which is not shown in the figure.

[0078] In this embodiment, the driving assembly 5 includes a driving motor 51, a coupling 52, a first sprocket 53, a second sprocket 54, a tensioning wheel 55, a tensioning wheel seat 56, an auxiliary wheel 57 and a first chain 58. The power output shaft of the driving motor 51 is connected to the rotating shaft of the first positioning roller 311 through the coupling 52, the first sprocket 53 is fixedly mounted on the rotating shaft of the first positioning roller 311; the second sprocket 54 is fixedly mounted on the rotating shaft of the first sliding roller 312; the tensioning wheel 55 is mounted on the frame 1 through the tensioning wheel seat 56, and is used to adjust the tightness of the first chain 58, which can be achieved by adjusting the position of the tensioning wheel 55; the first chain 58 connects the first sprocket 53, the second sprocket 54, the tensioning wheel 55 and the auxiliary wheel 57, which can not only realize transmission, but also prevent the first chain 58 from affecting the second sprocket 54 to slide with the first sliding roller 312.

[0079] In order to achieve feeding adjustment to prevent blockage and thereby increase crushing efficiency and crushing effect, in this embodiment, the coal sample pre-crushing device also includes a feeding belt machine 7 for feeding the box body 2; the feeding belt machine 7 includes a controller and a conveyor belt, and the controller is used to monitor the real-time current and rated current of the driving motor 51, and is used to adjust the feeding speed of the conveyor belt.

[0080] In this embodiment, the box body 2 includes an upper box body 21, a middle box body 22 and a lower box body 23; the upper box body 21, the middle box body 22 and the lower box body 23 enclose a crushing chamber, and a scraper plate 8 is installed in the crushing chamber. The scraper plate 8 is used to scrape the coal samples adhered to the lower crushing roller group 31 and the upper crushing roller group 32 to prevent residue and thus prevent contamination of the next coal sample.

[0081] Specifically, in this embodiment, the scraping plate 8 includes a first scraping plate 81 and a second scraping plate 82. The first scraping plate 81 is arranged in a one-to-one correspondence with the positioning roller, and a preset distance is formed between the first scraping plate 81 and the corresponding positioning roller. The second scraping plate 82 is arranged in a one-to-one correspondence with the sliding roller, and a preset distance is formed between the second scraping plate 82 and the corresponding sliding roller.

[0082] It can be known that the second scraping plate 82 can slide synchronously with the sliding roller. Of course, the position of the second scraping plate 82 can also be adjusted along with the sliding of the sliding roller, such as the second scraping plate 82 is provided with an elastic structure or a position adjustment component (such as installed at different positions of the box body 2 through fixing parts, connected and adjusted by bolts, etc.).

[0083] The embodiment of the present invention further provides an operation method of a coal sample pre-crushing device suitable for rapid coal quality detection based on the above, which specifically includes the following steps:

[0084] Put the coal sample with a preset maximum nominal particle size into the feeding belt conveyor 7, and start the coal sample pre-crushing device and the feeding belt conveyor 7;

[0085] The positioning drum of the crushing drum group 3 and the sliding drum of the crushing drum group 3 are driven to rotate relative to each other through the driving assembly 5 and the driven assembly 6, so as to perform multi-stage crushing on the coal sample and form a coal sample of preset specifications;

[0086] The adjustment mechanism 4 is used to adjust the distance between the sliding roller and the positioning roller arranged opposite to it;

[0087] The controller of the feeding belt conveyor 7 monitors the real-time current and the rated current of the driving motor 51 of the driving assembly 5 , and adjusts the feeding speed of the conveyor belt of the feeding belt conveyor 7 .

[0088] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A coal sample pre-crushing device suitable for rapid coal quality detection, characterized in that: include: frame; A box body is installed on the frame; A crushing roller group, at least two groups arranged in sequence along the gravity direction, each group of the crushing roller group comprises a positioning roller and a sliding roller arranged oppositely; the positioning roller is installed at a preset position of the box body, and the sliding roller is installed to slide relative to the box body; An adjusting mechanism connected to the sliding roller to adjust the distance between the sliding roller and the positioning roller arranged opposite thereto; A driving assembly connected to at least one of the positioning rollers and also connected to at least one of the sliding rollers; The driven assembly is provided with at least two groups, one of which is used to connect the positioning rollers of all the crushing roller groups so that all the positioning rollers rotate synchronously, and the other group is connected with the sliding rollers so that all the sliding rollers rotate synchronously.

2. A coal sample pre-crushing device suitable for rapid coal quality detection according to claim 1, characterized in that: The sliding roller is slidingly mounted on the box body; The adjustment mechanism comprises a connecting rod, a connecting plate, an adjustment shaft and an adjustment seat; One end of the connecting rod is connected to the sliding roller, and the other end is connected to the connecting plate; One end of the adjusting shaft is rotatably connected to the connecting plate, and the other end is threadedly connected to the adjusting seat; The adjustment seat is installed on the frame and / or the box.

3. A coal sample pre-crushing device suitable for rapid coal quality detection according to claim 2, characterized in that: Only one adjusting mechanism is provided, or a plurality of adjusting mechanisms are provided, and the plurality of adjusting mechanisms are provided in a one-to-one correspondence with the sliding rollers.

4. A coal sample pre-crushing device suitable for rapid coal quality detection according to claim 2, characterized in that: The adjustment mechanism also includes a scale plate; One end of the scale plate is fixed on the box body, and the other end is against the end surface of the connecting plate. The scale on the scale plate is arranged along the sliding direction of the sliding roller.

5. The coal sample pre-crushing device suitable for rapid coal quality detection according to claim 1 is characterized in that: The driving assembly includes a driving motor; The coal sample pre-crushing device also includes a feeding belt conveyor for feeding the box body; The feeding belt conveyor includes a controller and a conveyor belt. The controller is used to monitor the real-time current and rated current of the driving motor and to regulate the feeding speed of the conveyor belt.

6. The coal sample pre-crushing device suitable for rapid coal quality detection according to claim 1 is characterized in that: The crushing drum group includes a lower crushing drum group; The lower crushing roller group includes a first positioning roller and a first sliding roller; The first positioning roller and the first sliding roller are both connected to the driving assembly.

7. A coal sample pre-crushing device suitable for rapid coal quality detection according to claim 6, characterized in that: The driving assembly includes a driving motor, a coupling, a first sprocket, a second sprocket, a tensioning wheel, a tensioning wheel seat, an auxiliary wheel and a first chain; The power output shaft of the driving motor is connected to the rotating shaft of the first positioning roller through a coupling, and the first sprocket is fixedly mounted on the rotating shaft of the first positioning roller; The second sprocket is fixedly mounted on the rotating shaft of the first sliding roller; The tensioning wheel is installed on the frame through the tensioning wheel seat, and is used to adjust the tightness of the first chain; The first chain connects the first sprocket, the second sprocket, the tensioning wheel and the auxiliary wheel.

8. The coal sample pre-crushing device suitable for rapid coal quality detection according to claim 6 is characterized in that: The crushing drum group comprises an upper crushing drum group; The upper crushing roller group includes a second positioning roller and a second sliding roller; The second positioning roller is connected to the first positioning roller through a set of driven components; The second sliding roller is connected to the first sliding roller through another set of the driven components.

9. The coal sample pre-crushing device suitable for rapid coal quality detection according to claim 1, characterized in that: The box body comprises an upper box body, a middle box body and a lower box body; The upper box body, the middle box body and the lower box body enclose a crushing chamber, and a scraping plate is installed in the crushing chamber; The scraping plates are arranged one by one with the positioning rollers, and a preset distance is formed between the corresponding positioning rollers; The scraping plates are arranged in one-to-one correspondence with the sliding rollers, and a preset distance is formed between the corresponding sliding rollers.

10. An operating method of a coal sample pre-crushing device suitable for rapid coal quality detection based on any one of claims 1 to 9, characterized in that: The following steps are involved: Put the coal sample with the preset maximum nominal particle size into the feeding belt conveyor, and start the coal sample pre-crushing device and the feeding belt conveyor; The positioning drum of the crushing drum group and the sliding drum of the crushing drum group are driven to rotate relative to each other through the driving assembly and the driven assembly, so as to perform multi-stage crushing on the coal sample and form a coal sample of preset specifications; The distance between the sliding roller and the positioning roller arranged opposite to it is adjusted by using the adjusting mechanism; The controller of the feeding belt machine monitors the real-time current and rated current of the driving motor of the driving component, and adjusts the feeding speed of the conveyor belt of the feeding belt machine.

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