Multi-point sampling system of belt conveyor

Abstract

The invention relates to the field of sampling equipment of belt conveyors, in particular to a multi-point sampling system of a belt conveyor, which comprises a gantry frame, a traveling mechanism, a chute sampling device, a rotary scraper sampling device and an integrated collecting assembly, the gantry rack stretches across the belt conveyor, and the walking mechanism is arranged at the bottom of the gantry rack and used for driving the gantry rack to move in the length direction of the belt conveyor. The chute sampling device is arranged on a side stand column of the gantry rack and is used for sampling the end part of the belt conveyor; and the rotary scraper sampling device is arranged on a cross beam of the gantry rack and is used for sampling the middle part of the belt conveyor. The chute sampling device, the rotary scraper blade sampling device and the walking mechanism are integrated on the gantry rack, so that sampling operation can be carried out at any position of the end part and the middle part of the belt conveyor, and material information can be obtained in all directions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of belt conveyor sampling equipment, in particular to a multi-point sampling system of a belt conveyor. BACKGROUND

[0002] In the bulk material conveying process in the coal, mining, power and other industries, timely and accurate sampling of the material on the belt conveyor is a key link for coal quality testing, grade analysis and trade settlement.

[0003] The existing belt sampling device is usually fixedly installed at a specific position of the belt conveyor, such as the middle part or the end part of the belt, however, the fixed sampling device has the following technical defects.

[0004] Single sampling point: the sampling at the middle part of the belt (such as a rotating scraper) can usually only obtain the material on the surface of the belt, while the sampling at the end part of the belt (such as a chute) can obtain the material on the full cross section, but cannot reflect the segregation of the material in the conveying process.

[0005] Small coverage: for a long-distance conveying system, multiple sampling points are often needed. If a set of fixed sampling device is installed for each sampling point, not only the equipment investment is huge, but also the maintenance workload is heavy, and the site space is occupied.

[0006] Therefore, people need a sampling device capable of multi-point sampling and having large coverage to solve the above problems. SUMMARY

[0007] The purpose of the present application is to provide a multi-point sampling system of a belt conveyor, which aims to solve the problems of single sampling point and small coverage of the existing fixed sampling device.

[0008] To solve the above technical problems, the present application specifically provides the following technical solutions: A multi-point sampling system of a belt conveyor, comprising a portal frame, a traveling mechanism, a chute sampling device, a rotating scraper sampling device and an integrated collection assembly; The portal frame is horizontally arranged above the belt conveyor; The traveling mechanism is arranged at the bottom of the portal frame and is used to drive the portal frame to move along the length direction of the belt conveyor; The chute sampling device is arranged on the side upright column of the portal frame and is used to sample the end part of the belt conveyor; The rotating scraper sampling device is arranged on the cross beam of the portal frame and is used to sample the middle part of the belt conveyor; The integrated collection assembly has a first feeding port, a second feeding port and a converging discharge port which are fixedly arranged on the portal frame. The first feeding port is located corresponding to the discharge port of the chute sampling device for receiving the sample collected by the chute sampling device, and the second feeding port is located corresponding to the discharge port of the rotary scraper sampling device for receiving the sample collected by the rotary scraper sampling device; and the converging discharge port is used for connecting a downstream detection device.

[0009] Further, the integrated collection assembly comprises two sampling hoppers connected in series in the height direction, and the feeding ports of the two sampling hoppers are the first feeding port and the second feeding port respectively, wherein the discharge port of one sampling hopper corresponds to the second feeding port, and the discharge port of the other sampling hopper is the converging discharge port.

[0010] Further, the walking mechanism comprises a driving wheel set and a driven wheel set arranged at the bottom of the gantry frame, and a walking motor driving the driving wheel set to rotate. Parallel guide rails are laid on the ground on both sides of the belt conveyor, and the driving wheel set and the driven wheel set are in rolling fit with the parallel guide rails.

[0011] In one embodiment, the chute sampling device comprises a first driver, a four-bar linkage mechanism and a single-stage chute, the first driver driving the single-stage chute to perform reciprocating flipping motion between a vertical avoiding position and a horizontal sampling position through the four-bar linkage mechanism. The four-bar linkage mechanism comprises a fixed hinge base, a coupling bracket, a primary driving swing arm and a following swing arm. The fixed hinge base is fixed to the side of the frame at the conveying end of the belt conveyor, and the fixed hinge base is provided with a first hinge joint away from the belt conveyor and a second hinge joint close to the belt conveyor. The coupling bracket is fixed to the single-stage chute, and the coupling bracket is provided with a third hinge joint away from the belt conveyor and a fourth hinge joint close to the belt conveyor. The two ends of the primary driving swing arm are respectively hinged to the first hinge joint and the third hinge joint, and the output end of the first driver is connected with the primary driving swing arm for driving the primary driving swing arm to swing. The two ends of the following swing arm are respectively hinged to the second hinge joint and the fourth hinge joint.

[0012] Further, the geometric dimensions of the four-bar linkage mechanism are configured as: When the primary driving swing arm drives the single-stage chute to swing away from the belt conveyor to the vertical avoiding position, the single-stage chute is vertically stored beside the belt conveyor. When the primary drive swing arm drives the single-stage chute to swing towards the horizontal sampling position, the single-stage chute is in a posture with an included angle of 2°-5° with the horizontal plane, and is unfolded below the end of the belt conveyor, and the vertical height of the middle part of the single-stage chute is lower than the vertical height of the tail part of the single-stage chute.

[0013] In another embodiment, the chute sampling device comprises a first drive, a four-bar linkage mechanism, a crank linkage mechanism, and a telescopic chute assembly comprising at least a first-stage chute and a second-stage chute; the first-stage chute is slidably connected with the second-stage chute, the first drive is drivingly connected with the first-stage chute through the four-bar linkage mechanism, the first drive is drivingly connected with the second-stage chute through the crank linkage mechanism, and the first drive is used to drive the telescopic chute assembly to reciprocatingly turn between a vertical folding avoiding position and a horizontal unfolding sampling position; The four-bar linkage mechanism comprises a fixed hinge base, a coupling bracket, a primary drive swing arm, and a following swing arm. The fixed hinge base is fixed on the rack side of the conveying end of the belt conveyor, and the fixed hinge base is provided with a first hinge joint away from the belt conveyor and a second hinge joint close to the belt conveyor. The coupling bracket is fixed on the first-stage chute, and the coupling bracket is provided with a third hinge joint away from the belt conveyor and a fourth hinge joint close to the belt conveyor. The two ends of the primary drive swing arm are respectively hinged to the first hinge joint and the third hinge joint, and the output end of the first drive is connected with the primary drive swing arm for driving the primary drive swing arm to swing. The two ends of the following swing arm are respectively hinged to the second hinge joint and the fourth hinge joint. The crank linkage mechanism comprises a secondary drive swing arm and a transmission linkage. The output end of the first drive is connected with one end of the secondary drive swing arm for driving the secondary drive swing arm to swing, and the other end of the secondary drive swing arm is provided with a fifth hinge joint. One end of the transmission linkage is connected with the fifth hinge joint, and the other end of the transmission linkage is provided with a sixth hinge joint and is connected with the tail part of the second-stage chute.

[0014] Further, the primary drive swing arm and the secondary drive swing arm are an integral piece, one end of the secondary drive swing arm is rigidly fixed on the primary drive swing arm and located at the third hinge joint, and the secondary drive swing arm extends radially relative to the axis of the third hinge joint. The geometric dimensions of the four-bar linkage mechanism and the crank linkage mechanism are configured as follows: When the primary drive swing arm drives the first stage chute to swing towards the direction away from the belt conveyor to the vertical folding avoidance position, the primary drive swing arm rotates relative to the first stage chute, driving the secondary drive swing arm to pull the second stage chute in through the transmission connecting rod, so that the telescopic chute assembly is stored in the vertical folding posture beside the belt conveyor; When the primary drive swing arm drives the first stage chute to swing towards the direction away from the belt conveyor to the vertical folding avoidance position, the primary drive swing arm rotates relative to the first stage chute, driving the secondary drive swing arm to pull the second stage chute in through the transmission connecting rod, so that the telescopic chute assembly is stored in the vertical folding posture beside the belt conveyor;

[0015] Further, the rotating scraper sampling device comprises a scraper arm and a second drive for driving the rotation of the scraper arm; The scraper arm is configured to rotate across the belt surface of the belt conveyor to intercept materials and throw the materials into the second feeding port of the integrated collection assembly when the portal frame moves to the middle position of the belt conveyor.

[0016] In one embodiment, further comprising a gas supply assembly and a docking assembly; The tail of the single-stage chute is provided with a first slit nozzle flush with the bottom wall of the single-stage chute, and the gas supply assembly is used to output compressed air to the first slit nozzle to form an air knife for blowing the inner wall of the single-stage chute; The docking assembly is used to connect the gas supply assembly and the first slit nozzle when the single-stage chute is in the vertical avoidance position, and separate the gas supply assembly and the first slit nozzle when the single-stage chute is in the horizontal sampling position; The docking assembly comprises: An air inlet cover is installed on the outside of the single-stage chute and covers the first slit nozzle; A first sealing ring is installed on the air inlet of the air inlet cover; A valve is installed on the frame, and the air inlet of the valve is connected to the gas supply assembly; A second sealing ring is installed on the air outlet of the valve; When the single-stage chute is in the vertical avoidance position, the first sealing ring and the second sealing ring are coaxially docked and pressed tightly to form an air flow channel connecting the gas supply assembly and the first slit nozzle.

[0017] In another embodiment, a gas supply assembly and a docking assembly are further included; The tail of the first-stage chute is provided with a second slit nozzle flush with the bottom wall of the first-stage chute; The telescopic chute assembly is configured such that, when in the vertically folded avoidance position, the second-stage chute is retracted to the first-stage chute, and a third slit nozzle is formed between the tail outer wall of the first-stage chute and the tail inner wall of the second-stage chute; The gas supply assembly is configured to simultaneously output compressed air to the second slit nozzle and the third slit nozzle to form air knives for purging the inner walls of the first-stage chute and the second-stage chute, respectively; The docking assembly is configured to connect the gas supply assembly with the second slit nozzle and the third slit nozzle when the telescopic chute assembly is in the vertically folded avoidance position, and to disconnect when the telescopic chute assembly is in the horizontally unfolded sampling position; The docking assembly includes: An air inlet cover is installed on the outside of the first-stage chute and covers the second slit nozzle and the third slit nozzle; A first sealing ring is installed on the air inlet of the air inlet cover; A valve is installed on the rack, and the air inlet of the valve is connected to the gas supply assembly; A second sealing ring is installed on the air outlet of the valve; When the telescopic chute assembly is in the vertically folded avoidance position, the first sealing ring and the second sealing ring are coaxially docked and compressed to form an air flow channel connecting the gas supply assembly and the air inlet cover.

[0018] Compared with the prior art, the present application has the following beneficial effects: A multi-point sampling system for a belt conveyor is provided, which integrates a chute sampling device, a rotary scraper sampling device, and a walking mechanism on a portal frame, thereby enabling sampling operations at any position of the end and middle of the belt conveyor and enabling comprehensive acquisition of material information. BRIEF DESCRIPTION OF DRAWINGS

[0019] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0020] Figure 1 A perspective view of a middle sampling working condition of the first embodiment of the present application; Figure 2 Figure 2 is a cross-sectional view of the cross-section of the middle sampling working condition for the first embodiment of the present application; Figure 3 Figure 3 is a perspective view of the end sampling working condition for the first embodiment of the present application; Figure 4 Figure 4 is a cross-sectional view of the cross-section of the end sampling working condition for the first embodiment of the present application; Figure 5 Figure 5 is a front view of the vertical avoidance position for the first embodiment of the present application; Figure 6 Figure 6 is a front view of the horizontal sampling position for the first embodiment of the present application; Figure 7 Figure 7 is a perspective view of the vertical avoidance position for the first embodiment of the present application; Figure 8 Figure 8 is a perspective view of the horizontal sampling position for the first embodiment of the present application; Figure 9 Figure 9 is a side view of the vertical avoidance position for the first embodiment of the present application; Figure 10 Figure 10 is a cross-sectional view of the A-A direction of Figure 9 Figure 11 is a cross-sectional view of the B-B direction of Figure 11 Figure 12 is a front view of the vertical folding avoidance position for the second embodiment of the present application; Figure 12 Figure 13 is a front view of the horizontal unfolding sampling position for the second embodiment of the present application; Figure 13 Figure 14 is a perspective view of the vertical folding avoidance position for the second embodiment of the present application; Figure 14 Figure 15 is a perspective view of the horizontal unfolding sampling position for the second embodiment of the present application; Figure 15 Figure 16 is a side view of the vertical folding avoidance position for the second embodiment of the present application; Figure 16 Figure 17 is a cross-sectional view of the B-B direction of Figure 15 Figure 18 is a cross-sectional view of the A-A direction of The reference numerals in the figures respectively represent the following: 11 - belt conveyor; 12 - gantry frame; 121 - side upright column; 122 - cross beam; 13 - traveling mechanism; 131 - parallel guide rail; 14 - integrated collection assembly; 141 - first feeding port; 142 - second feeding port; 143 - converging discharging port; 144 - sampling hopper; 15 - waste hopper; 2 - driver; 21 - motor; 22 - speed reducer; 3 - four-bar linkage mechanism; 31 - fixed hinge base; 32 - coupling bracket; 33 - first-stage driving swing arm; 34 - following swing arm; 341 - protruding portion; 35 - first hinge point; 36 - second hinge point; 37 - third hinge point; 38 - fourth hinge point; 4- chute sampling device; 41- single-stage chute; 42- first slit jet; 43- first stage chute; 44- second stage chute; 45- second slit jet; 46- third slit jet; 5- crank linkage; 51- second stage drive swing arm; 52- drive link; 53- fifth articulation point; 54- sixth articulation point; 61- floating idler assembly; 62- pressure sensor assembly; 63- wear window; 64- probe; 7- docking assembly; 71- air intake shroud; 72- first seal; 73- valve; 74- second seal; 8- air supply assembly; 9- rotary flight sampling device; 91- flight arm; 92- second drive. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0022] In the material conveying and production process of the belt conveyor 11, in order to conduct overall quality monitoring on the material, the material at different positions on the belt conveyor 11 needs to be collected, for example, full-section samples are obtained at the belt end, or surface layer samples are obtained at the middle of the belt.

[0023] However, the existing sampling technology usually relies on fixedly installed single-function devices. If multi-position sampling is to be achieved, independent chute sampling machines and flight sampling machines need to be installed at the belt end and the middle of the belt respectively.

[0024] Such a decentralized device layout has many disadvantages: first, there is a large investment in repeated equipment, and a large amount of site space is occupied; second, the equipment position is fixed, and the sampling point cannot be flexibly adjusted along the length direction of the belt according to the working condition demand; third, the sample outlets of different sampling devices are scattered, leading to extremely complex pipeline design of the sample collection and subsequent conveying system, and it is difficult to realize unified gathering and detection of the samples.

[0025] Therefore, how to design a comprehensive sampling device capable of integrating the functions of mobility, multi-position sampling and sample centralized collection is the core technical problem to be solved by the present application.

[0026] (First embodiment) Reference Figure 1 , Figure 2 , Figure 3 ,Figure 4 The embodiment provides a multi-point sampling system of a belt conveyor 11, which comprises a portal frame 12, a walking mechanism 13, a chute sampling device 4, a rotary scraper sampling device 9 and an integrated collection assembly 14. The portal frame 12 is horizontally arranged above the belt conveyor 11. The walking mechanism 13 is arranged at the bottom of the portal frame 12 and is used for driving the portal frame 12 to move along the length direction of the belt conveyor 11. The chute sampling device 4 is arranged on the side column 121 of the portal frame 12 and is used for sampling the end part of the belt conveyor 11. The rotary scraper sampling device 9 is arranged on the cross beam 122 of the portal frame 12 and is used for sampling the middle part of the belt conveyor 11, and the rotary scraper sampling device 9 comprises a scraper arm 91 and a second driver 92 used for driving the scraper arm 91 to rotate. The integrated collection assembly 14 has a first feeding port 141, a second feeding port 142 and a converging discharging port 143 which are fixedly arranged on the portal frame 12. The first feeding port 141 is located at the position corresponding to the discharging port of the chute sampling device 4 and is used for receiving the sample collected by the chute sampling device 4, the second feeding port 142 is located at the position corresponding to the discharging port of the rotary scraper sampling device 9 and is used for receiving the sample collected by the rotary scraper sampling device 9, and the converging discharging port 143 is used for connecting downstream detection equipment (such as a crushing and classifying machine or an online analyzer).

[0027] The multi-point sampling system integrates components with multiple functions on a movable portal frame 12, realizes flexible sampling and centralized collection of different positions of the belt conveyor 11, and the specific working process is as follows: Moving positioning: the walking mechanism 13 drives the portal frame 12 to move along the length direction of the belt conveyor 11, and according to the sampling requirement, the control system can accurately position the portal frame 12 to the middle part or the conveying end of the belt conveyor 11.

[0028] Reference Figure 1 , Figure 2 Middle part sampling: when the portal frame 12 moves to the middle part of the belt conveyor 11, the rotary scraper sampling device 9 located on the cross beam 122 starts to work, the scraper arm 91 thereof rotates and sweeps the surface of the belt, scrapes the surface layer material, and the collected sample is thrown to the second feeding port 142 of the integrated collection assembly 14.

[0029] Reference Figure 3 , Figure 4End sampling: when the gantry 12 moves to the end of the belt conveyor 11, the chute sampling device 4 on the side upright column 121 starts to work (for example, flips out), directly intercepts the material flow falling from the end of the belt, and the collected sample is directly guided and falls into the first feeding port 141 of the integrated collection assembly 14 by gravity.

[0030] Converging output: the end sample from the chute sampling device 4 and the middle sample from the rotary scraper sampling device 9 enter the inside of the integrated collection assembly 14 through the first feeding port 141 and the second feeding port 142 respectively, and the integrated collection assembly 14 uses gravity or structural guidance to converge the samples from different sources to the converging discharge port 143 at the bottom, so as to realize the coordinated operation of multi-point sampling and single-point output through a single physical interface to connect downstream crushing and dividing machines or online detection equipment.

[0031] Specifically, the integrated collection assembly 14 includes two sampling hoppers 144 connected in series in the height direction, and the feeding ports of the two sampling hoppers 144 are the first feeding port 141 and the second feeding port 142 respectively, wherein the discharge port of one sampling hopper 144 is connected to the second feeding port 142, and the discharge port of the other sampling hopper 144 is the converging discharge port 143.

[0032] The traveling mechanism 13 includes a power wheel set and a driven wheel set arranged at the bottom of the gantry 12, and a traveling motor (not shown in the figure) driving the power wheel set to rotate; parallel guide rails 131 are laid on the ground on both sides of the belt conveyor 11, and the power wheel set and the driven wheel set are in rolling fit with the parallel guide rails 131.

[0033] Reference Figure 5 , Figure 6 , Figure 7 and Figure 8 The chute sampling device 4 of the embodiment includes a first driver 2, a four-bar linkage mechanism 3 and a single-stage chute 41, the first driver 2 drives the single-stage chute 41 to perform reciprocating flipping motion between a vertical avoidance position (as shown in Figure 5 , Figure 7 ) and a horizontal sampling position (as shown in Figure 6 , Figure 8 ) through the four-bar linkage mechanism 3.

[0034] The first driver 2 includes a motor 21 and a speed reducer 22, and the output shaft of the motor 21 is rigidly connected to the power input end of the four-bar linkage mechanism 3 through the speed reducer 22, providing large torque driving force.

[0035] The four-bar linkage mechanism 3 includes a fixed hinge base 31, a coupling bracket 32, a primary driving swing arm 33 and a follow-up swing arm 34 as four connecting rods, and a first hinge point 35, a second hinge point 36, a third hinge point 37 and a fourth hinge point 38 as four connecting rod pivots.

[0036] The fixed hinge seat 31 is fixed to the side of the frame at the end of the conveyor belt 11 and is set horizontally. It has a first hinge point 35 away from the conveyor belt 11 and a second hinge point 36 close to the conveyor belt 11.

[0037] The coupling bracket 32 ​​is fixed on the single-stage chute 41, and has a third hinge point 37 away from the belt conveyor 11 and a fourth hinge point 38 close to the belt conveyor 11.

[0038] The first-stage drive arm 33 connects the first hinge point 35 and the third hinge point 37. The output shaft of the reducer 22 of the first driver 2 is rigidly connected to one end of the first-stage drive arm 33 (at the first hinge point 35) to provide power for the single-stage chute 41 to flip.

[0039] The follower arm 34 connects the second hinge point 36 and the fourth hinge point 38, and is used to follow the movement of the first-stage drive arm 33 to constrain the posture of the single-stage chute 41.

[0040] In this embodiment, the geometric dimensions of the four-bar linkage 3 are configured as follows: The length of the follower swing arm 34 is greater than the length of the first-stage drive swing arm 33; the distance between the first hinge point 35 and the second hinge point 36 is equal to the distance between the third hinge point 37 and the fourth hinge point 38. This specific geometric relationship allows the middle part of the single-stage chute 41 to rotate relative to its tail during the movement, thereby enabling the single-stage chute 41 to achieve a specific flipping trajectory.

[0041] refer to Figure 5 and Figure 7 The vertical clearance position shown: When the first-stage drive arm 33 drives the single-stage chute 41 to swing away from the belt conveyor 11, the middle part of the single-stage chute 41 reverses upward relative to the tail, so that the single-stage chute 41 is stored in a vertical position next to the belt conveyor 11. In this state, the chute does not occupy the space below, which is convenient for maintenance and clearance.

[0042] refer to Figure 6 and Figure 8 The horizontal sampling position shown is as follows: when the first-stage drive arm 33 drives the single-stage chute 41 to swing toward the direction close to the belt conveyor 11, the middle part of the single-stage chute 41 reverses downward relative to the tail, so that the single-stage chute 41 eventually unfolds almost horizontally below the end of the belt conveyor 11.

[0043] At this position, the single-stage chute 41 is positioned at an angle of 2° to 5° with the horizontal plane, and the vertical height of the middle part of the single-stage chute 41 is lower than the vertical height of the tail part of the single-stage chute 41, so that the material can flow smoothly along the single-stage chute 41 to the sample collection hopper.

[0044] Further, since the frame of the belt conveyor 11 is extremely close to the movement path of the single-stage chute 41, the straight rod-shaped follow-up swing arm 34 is extremely prone to collision with the frame of the belt conveyor 11 when it is turned down.

[0045] To solve this problem, with reference to Figure 6 and Figure 8 , the follow-up swing arm 34 of the present embodiment is designed as a special curved rod, which has a convex portion 341 (C-shaped) in the middle part that is curved away from the belt conveyor 11 (i.e. toward the side of the primary drive swing arm 33), which can bypass the edge of the frame of the belt conveyor 11 when the single-stage chute 41 is in the horizontal sampling position.

[0046] This design greatly enhances the reach of the single-stage chute 41, making it applicable to wider belt conveyors 11.

[0047] Further, with reference to Figure 3 , to solve the problem of large random sampling or timed sampling errors, the device further comprises an online weight detection module.

[0048] The online weight detection module comprises a floating roller set 61 and a pressure sensor assembly 62, the floating roller set 61 replaces a part of the roller set upstream of the belt conveyor 11, the floating roller set 61 is mechanically separated from the frame of the belt conveyor 11 and is supported as a whole on the pressure sensor assembly 62, the pressure sensor assembly 62 is fixedly connected to the frame, for detecting the total weight of the floating roller set 61, the belt and the material above it, and the control unit calculates the real-time distribution density of the material accordingly.

[0049] The working principle of the online weight detection module: the pressure sensor assembly 62 transmits signals to the control unit, the control unit receives the signals, calculates the real-time distribution density of the material according to the real-time weight (minus the tare weight), and the control unit calculates the optimal timing and duration of the next sampling according to the density data, thereby realizing intelligent sampling based on flow fluctuations.

[0050] Further, since the moisture of the material will significantly affect the weight data and in turn affect the accuracy of the density calculation, with reference to Figure 9 and Figure 10 , the device further comprises an online moisture detection module integrated on the single-stage chute 41, which comprises: a wear-resistant window 63 (such as sapphire glass) and a near-infrared spectrometer.

[0051] The wear-resistant window 63 replaces a part of the bottom wall of the single-stage chute 41 and is flush with the inner wall to prevent material blocking; the probe 64 of the near-infrared spectrometer is fixedly connected to the outside of the single-stage chute 41, and the detection end of the probe 64 faces the wear-resistant window 63.

[0052] The working principle of the online humidity detection module is as follows: When the single-stage chute 41 intercepts the material, the material slides through the wear-resistant window 63, and the probe 64 performs spectral scanning on the material through the window to detect the real-time humidity of the material. The control unit receives the signal and uses the humidity data to correct the real-time distribution density calculated above, thereby eliminating moisture interference and further optimizing the sampling strategy.

[0053] Furthermore, when handling high-humidity, high-viscosity materials, the materials are very likely to adhere to the inner wall of the single-stage chute 41 and the surface of the wear-resistant window 63, leading to cross-contamination and sensor failure. To address this, the device also integrates an air supply component 8 and a docking component 7, which utilize vertical clearance to automatically purge the single-stage chute 41.

[0054] The tail end of the single-stage chute 41 is provided with a first slit nozzle 42, which is flush with the bottom wall of the single-stage chute 41. An air inlet shroud 71 is installed on the outside of the single-stage chute 41, and the air outlet of the air inlet shroud 71 covers the first slit nozzle 42. A first sealing ring 72 is installed at the air inlet of the air inlet shroud 71.

[0055] An air supply assembly 8 and a docking assembly 7 are installed on the frame. The air supply assembly 8 includes an air compressor and an air storage cylinder connected in sequence. The docking assembly 7 includes a valve 73 and a second sealing ring 74. The second sealing ring 74 is installed at the air outlet of the valve 73. The air compressor, the air storage cylinder and the valve 73 are connected in sequence. The position of the valve 73 is set at the position directly opposite the air inlet of the air inlet hood 71 when the single-stage chute 41 is in the vertical clearance position.

[0056] like Figure 9 , Figure 10 As shown, the purging process is as follows: Step 1, Mechanical docking: After each sampling is completed, when the first driver 2 drives the single-stage chute 41 to flip back to the vertical clearance position, the first sealing ring 72 and the second sealing ring 74 automatically dock coaxially and press together, thereby forming an airflow channel connecting the air supply assembly 8 and the first slit nozzle 42.

[0057] Step 2, air knife purging: The control unit controls the valve 73 to open, and the compressed air inside the gas storage cylinder is ejected at high speed from the first slit nozzle 42 through the airflow channel, forming an air knife that flows along the bottom wall of the chute. The air knife quickly sweeps across the inner wall of the single-stage chute 41 and the surface of the wear-resistant viewing window 63, blowing the residual material into the waste hopper 15 below.

[0058] Step 3, Reset and Refill: After purging, valve 73 is closed, and the air compressor replenishes compressed air to the storage cylinder, waiting for the next cycle.

[0059] (Second Embodiment) The chute sampling device 4 of the embodiment comprises a telescopic chute assembly arranged at the conveying end of the belt conveyor 11, which is used to overturn and extend during sampling, intercept the material in the falling process, and move the material to the sample collection bucket.

[0060] With reference to Figure 11 , Figure 12 , Figure 13 and Figure 14 , the device comprises a first driver 2, a four-bar linkage mechanism 3, a crank linkage mechanism 5, and a telescopic chute assembly.

[0061] The telescopic chute assembly comprises a first-stage chute 43 as a main body and a second-stage chute 44 sleeved outside (or inside) the first-stage chute 43 and capable of sliding along the slide rail relative to the first-stage chute 43, so as to change the total length of the telescopic chute assembly.

[0062] The first driver 2 comprises a motor 21 and a reducer 22, and the output shaft of the motor 21 provides precise rotary power through the reducer 22.

[0063] The device simultaneously drives two sets of mechanisms through the first driver 2, realizing the linkage of overturning and telescoping: the first driver 2 is drivingly connected to the first-stage chute 43 through the four-bar linkage mechanism 3, driving it to perform reciprocating overturning motion between the vertical folding avoidance position Figure 11 and the horizontal unfolding sampling position Figure 12 ; at the same time, the first driver 2 is drivingly connected to the second-stage chute 44 through the crank linkage mechanism 5, driving it to perform telescoping motion relative to the first-stage chute 43.

[0064] Specifically, with reference to Figure 11 , Figure 12 , Figure 13 and Figure 14 , the four-bar linkage mechanism 3 comprises a fixed hinge base 31, a coupling bracket 32, a primary driving swing arm 33, and a following swing arm 34.

[0065] The fixed hinge base 31 is fixed to the side of the rack at the end of the belt conveyor 11, and is provided with a first hinge point 35 away from the belt conveyor 11 and a second hinge point 36 close to the belt conveyor 11.

[0066] The coupling bracket 32 is fixed to the first-stage chute 43, and is provided with a third hinge point 37 away from the belt conveyor 11 and a fourth hinge point 38 close to the belt conveyor 11.

[0067] The primary driving swing arm 33 connects the first hinge point 35 and the third hinge point 37, and the output end of the first driver 2 is rigidly connected to one end (at the first hinge point 35) of the primary driving swing arm 33, driving it to swing.

[0068] The follower arm 34 connects the second hinge point 36 and the fourth hinge point 38, and its length is greater than the length of the first-stage drive arm 33.

[0069] The crank-connecting rod mechanism 5 includes a two-stage drive swing arm 51 and a transmission connecting rod 52.

[0070] One end of the secondary drive swing arm 51 is connected to the output end of the first driver 2 (or is integrally connected to the primary drive swing arm 33), and the other end is provided with a fifth hinge point 53.

[0071] In this embodiment, one end of the secondary drive swing arm 51 is rigidly fixed to the primary drive swing arm 33 and located at the third hinge point 37, extending radially relative to the axis of the third hinge point 37. That is, the primary drive swing arm 33 and the secondary drive swing arm 51 constitute a rigid composite swing arm.

[0072] One end of the transmission link 52 is connected to the fifth hinge point 53, and the other end is provided with a sixth hinge point 54 and connected to the tail of the second-stage chute 44.

[0073] This device utilizes the relative rotation angle of the primary drive swing arm 33 with respect to the first-stage chute 43 (coupled bracket 32) to drive extension and retraction via the secondary drive swing arm 51, thereby achieving the following two states.

[0074] State 1, Vertical Folding Avoidance Position: When the primary drive swing arm 33 swings upward, driving the first-stage chute 43 to flip in a vertical position away from the belt conveyor 11, the primary drive swing arm 33 rotates relative to the first-stage chute 43. This rotation causes the secondary drive swing arm 51, which is integrated with it, to swing. Through the transmission link 52, the second-stage chute 44 is pulled inward, so that the telescopic chute assembly is stored in a vertically folded position next to the belt conveyor 11, and the second-stage chute 44 is completely retracted, with the shortest total length, effectively avoiding interference with the ground or equipment below.

[0075] State 2, Horizontal Deployment Sampling Position: When the primary drive arm 33 swings downward, driving the first-stage chute 43 to flip towards the belt conveyor 11 to a horizontal position, the primary drive arm 33 rotates in the opposite direction relative to the first-stage chute 43. This rotation causes the secondary drive arm 51 to swing in the opposite direction, forcibly pushing the second-stage chute 44 outward through the transmission link 52. As a result, the telescopic chute assembly is deployed in a nearly horizontal position (angle 2°~5°, middle section lower than tail section) below the end of the belt conveyor 11, and the second-stage chute 44 extends to its maximum length, completely covering the material flow of the wide belt.

[0076] To solve the problem of space limitation, the follow-up swing arm 34 of the embodiment is designed as a special curved rod, the middle part of which has a convex part 341 (C-shaped) bent towards the direction away from the belt conveyor 11, which can bypass the edge of the frame of the belt conveyor 11 when the telescopic chute assembly is in the horizontal unfolded sampling position, so that the telescopic chute assembly can be more deeply explored under the belt.

[0077] On the other hand, to solve the problem of large random sampling or timing sampling error, in addition to integrating the same online weight detection module as the first embodiment, the embodiment also integrates an online humidity detection module.

[0078] The online humidity detection module is integrated on the second-stage chute 44, which includes a wear-resistant window 63 replacing the bottom wall of the second-stage chute 44, and a near-infrared spectrometer fixed outside the second-stage chute 44, which works in the same way as the first embodiment.

[0079] Further, when processing high-humidity and high-viscosity materials, the materials are extremely easy to adhere to the inner wall of the telescopic chute assembly and the surface of the wear-resistant window 63, causing cross-contamination and sensor failure. For this reason, referring to Figure 15 and Figure 16 , the device also integrates a gas supply assembly 8 and a docking assembly 7, which automatically blows the telescopic chute assembly using a vertical folding avoidance position.

[0080] The tail of the first-stage chute 43 is provided with a second slit nozzle 45, and the outer side of the first-stage chute 43 is provided with an air inlet cover 71, the air outlet of which covers the second slit nozzle 45, and the air inlet of the air inlet cover 71 is provided with a first sealing ring 72.

[0081] When the telescopic chute assembly is in the vertical folding avoidance position and the second-stage chute 44 is retracted to the first-stage chute 43, a gap is naturally formed between the tail outer wall of the first-stage chute 43 and the tail inner wall of the second-stage chute 44, which constitutes a third slit nozzle 46 that communicates with the inside of the air inlet cover 71, and the air outlet of the air inlet cover 71 also covers the third slit nozzle 46.

[0082] The gas supply assembly 8 includes an air compressor and an air tank connected in sequence, and the docking assembly 7 includes a valve 73 and a second sealing ring 74, the second sealing ring 74 being installed at the air outlet of the valve 73, the air compressor, the air tank and the valve 73 being connected in sequence, and the valve 73 being positioned at a position opposite to the air inlet of the air inlet cover 71 when the telescopic chute assembly is in the vertical folding avoidance position.

[0083] Referring to Figure 15 and Figure 16 , the blowing work flow is as follows: Step 1: Mechanical docking: After each sampling, the first driver 2 drives the retractable chute assembly to flip back to the vertical folding avoidance position. At this time, the first sealing ring 72 of the air inlet cover 71 is automatically coaxially docked with the second sealing ring 74 of the valve 73 and is pressed tightly.

[0084] Step 2: Air knife blowing: The control unit opens the valve 73, and the compressed air in the air cylinder enters the air inlet cover 71 and is automatically divided: through the second narrow slit nozzle 45, a wind knife is formed to blow the inner wall of the first-stage chute 43; through the third narrow slit nozzle 46, a wind knife is formed to blow the inner wall of the second-stage chute 44 (and the wear-resistant window 63), and the waste is blown to the waste hopper 15 below the retractable chute assembly.

[0085] Step 3: Resetting and inflating: After blowing, the valve 73 is closed, the air compressor replenishes compressed air to the air cylinder, and the next cycle is waited.

[0086] The above examples are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also considered to fall within the protection scope of the embodiments of the present application.

Claims

1. A multi-point sampling system for a belt conveyor, characterized in that, It includes a gantry frame (12), a traveling mechanism (13), a chute sampling device (4), a rotating scraper sampling device (9), and an integrated collection assembly (14). The gantry frame (12) spans across the belt conveyor (11); The walking mechanism (13) is located at the bottom of the gantry frame (12) and is used to drive the gantry frame (12) to move along the length direction of the belt conveyor (11); The chute sampling device (4) is installed on the side column (121) of the gantry frame (12) and is used to sample the end of the belt conveyor (11). The rotating scraper sampling device (9) is installed on the crossbeam (122) of the gantry frame (12) and is used to sample the middle part of the belt conveyor (11). The integrated collection component (14) has a first feed inlet (141), a second feed inlet (142) and a converging discharge outlet (143) fixedly mounted on the gantry frame (12). The first feed inlet (141) is located at the outlet of the chute sampling device (4) and is used to receive the sample collected by the chute sampling device (4). The second feed inlet (142) is located at the outlet of the rotating scraper sampling device (9) and is used to receive the sample collected by the rotating scraper sampling device (9). The converging outlet (143) is used to connect to the downstream testing equipment.

2. The multi-point sampling system for a belt conveyor according to claim 1, characterized in that, The integrated collection component (14) includes two sampling hoppers (144) connected in series in the height direction. The inlets of the two sampling hoppers (144) are a first inlet (141) and a second inlet (142), respectively. The outlet of one sampling hopper (144) corresponds to the second inlet (142), and the outlet of the other sampling hopper (144) is a converging outlet (143).

3. The multi-point sampling system for a belt conveyor according to claim 1, characterized in that, The walking mechanism (13) includes a power wheel set and a driven wheel set disposed at the bottom of the gantry frame (12), and a walking motor that drives the power wheel set to rotate; The belt conveyor (11) has parallel guide rails (131) laid on both sides of the ground, and the power wheel set and the driven wheel set are in rolling cooperation with the parallel guide rails (131).

4. The multi-point sampling system for a belt conveyor according to claim 1, characterized in that, The chute sampling device (4) includes a first driver (2), a four-bar linkage (3) and a single-stage chute (41). The first driver (2) drives the single-stage chute (41) to reciprocate between the vertical avoidance position and the horizontal sampling position through the four-bar linkage (3). The four-bar linkage (3) includes a fixed hinge (31), a coupling bracket (32), a primary drive swing arm (33), and a follower swing arm (34). The fixed hinge (31) is fixed to the side of the frame at the conveying end of the belt conveyor (11). The fixed hinge (31) is provided with a first hinge point (35) away from the belt conveyor (11) and a second hinge point (36) close to the belt conveyor (11). The coupling bracket (32) is fixed on the single-stage chute (41), and the coupling bracket (32) is provided with a third hinge point (37) away from the belt conveyor (11) and a fourth hinge point (38) close to the belt conveyor (11). The two ends of the first-stage drive arm (33) are respectively hinged to the first hinge point (35) and the third hinge point (37). The output end of the first driver (2) is connected to the first-stage drive arm (33) to drive the first-stage drive arm (33) to swing. The two ends of the follower arm (34) are respectively hinged to the second hinge point (36) and the fourth hinge point (38).

5. A multi-point sampling system for a belt conveyor according to claim 4, characterized in that, The geometry of the four-bar linkage (3) is configured as follows: When the first-stage drive arm (33) drives the single-stage chute (41) to swing away from the belt conveyor (11) to the vertical clearance position, the single-stage chute (41) is stored in a vertical position on the side of the belt conveyor (11). When the first-stage drive arm (33) drives the single-stage chute (41) to swing toward the horizontal sampling position in a direction close to the belt conveyor (11), the single-stage chute (41) is in an angle of 2°~5° with the horizontal plane, and extends to below the end of the belt conveyor (11), and the vertical height of the middle part of the single-stage chute (41) is lower than the vertical height of the tail of the single-stage chute (41).

6. The multi-point sampling system for a belt conveyor according to claim 1, characterized in that, The chute sampling device (4) includes a first driver (2), a four-bar linkage (3), a crank-connecting rod mechanism (5), and a telescopic chute assembly having at least a first-stage chute (43) and a second-stage chute (44); the first-stage chute (43) and the second-stage chute (44) are slidably connected; the first driver (2) is driven to the first-stage chute (43) through the four-bar linkage (3); the first driver (2) is driven to the second-stage chute (44) through the crank-connecting rod mechanism (5); the first driver (2) is used to drive the telescopic chute assembly to reciprocate between the vertical folding avoidance position and the horizontal unfolding sampling position. The four-bar linkage (3) includes a fixed hinge (31), a coupling bracket (32), a primary drive swing arm (33), and a follower swing arm (34). The fixed hinge (31) is fixed to the side of the frame at the conveying end of the belt conveyor (11). The fixed hinge (31) is provided with a first hinge point (35) away from the belt conveyor (11) and a second hinge point (36) close to the belt conveyor (11). The coupling bracket (32) is fixed on the first-stage chute (43). The coupling bracket (32) is provided with a third hinge point (37) away from the belt conveyor (11) and a fourth hinge point (38) close to the belt conveyor (11). The two ends of the first-stage drive arm (33) are respectively hinged to the first hinge point (35) and the third hinge point (37). The output end of the first driver (2) is connected to the first-stage drive arm (33) to drive the first-stage drive arm (33) to swing. The two ends of the follower arm (34) are respectively hinged to the second hinge point (36) and the fourth hinge point (38). The crank-connecting rod mechanism (5) includes a two-stage drive swing arm (51) and a transmission connecting rod (52). The output end of the first driver (2) is connected to one end of the secondary drive arm (51) to drive the secondary drive arm (51) to swing. The other end of the secondary drive arm (51) is provided with a fifth hinge point (53). One end of the transmission link (52) is connected to the fifth hinge point (53), and the other end of the transmission link (52) is provided with a sixth hinge point (54) and connected to the tail of the second-stage chute (44).

7. A multi-point sampling system for a belt conveyor according to claim 6, characterized in that, The first-stage drive arm (33) and the second-stage drive arm (51) are an integral part. One end of the second-stage drive arm (51) is rigidly fixed to the first-stage drive arm (33) and located at the third hinge point (37). The second-stage drive arm (51) extends radially relative to the axis of the third hinge point (37). The geometry of the four-bar linkage (3) and the crank-connecting rod mechanism (5) is configured as follows: When the first-stage drive swing arm (33) drives the first-stage chute (43) to swing away from the belt conveyor (11) to the vertical folding clearance position, the first-stage drive swing arm (33) rotates relative to the first-stage chute (43), causing the second-stage drive swing arm (51) to pull the second-stage chute (44) back through the transmission link (52), so that the telescopic chute assembly is stored in a vertical folding posture on the side of the belt conveyor (11); When the first-stage drive arm (33) drives the first-stage chute (43) to swing toward the direction close to the belt conveyor (11) to the horizontal expansion sampling position, the first-stage drive arm (33) rotates in the opposite direction relative to the first-stage chute (43), causing the second-stage drive arm (51) to push the second-stage chute (44) out through the transmission link (52), so that the telescopic chute assembly is in an angle of 2°~5° with the horizontal plane, and expands to below the end of the belt conveyor (11), and the vertical height of the middle part of the telescopic chute assembly is lower than the vertical height of the tail part of the telescopic chute assembly.

8. A multi-point sampling system for a belt conveyor according to claim 1, characterized in that, The rotating scraper sampling device (9) includes a scraper arm (91) and a second driver (92) that drives the scraper arm (91) to rotate. The scraper arm (91) is configured such that when the gantry frame (12) moves to the middle position of the belt conveyor (11), the scraper arm (91) can rotate and sweep across the belt surface of the belt conveyor (11) to intercept the material and throw the material into the second feed port (142) of the integrated collection assembly (14).

9. A multi-point sampling system for a belt conveyor according to claim 4 or 5, characterized in that, It also includes a gas supply component (8) and a docking component (7); The tail end of the single-stage chute (41) is provided with a first slit nozzle (42), which is flush with the bottom wall of the single-stage chute (41). The air supply assembly (8) is used to output compressed air to the first slit nozzle (42) to form an air knife that blows the inner wall of the single-stage chute (41). The docking assembly (7) is used to connect the air supply assembly (8) and the first slit nozzle (42) when the single-stage chute (41) is in the vertical clearance position, and to separate the air supply assembly (8) and the first slit nozzle (42) when the single-stage chute (41) is in the horizontal sampling position. The docking component (7) includes: An air intake shroud (71) is installed on the outside of the single-stage chute (41) and covers the first slit nozzle (42). The first sealing ring (72) is installed at the air inlet of the air inlet cover (71); A valve (73) is mounted on the frame, and the air inlet of the valve (73) is connected to the air supply assembly (8). The second sealing ring (74) is installed at the outlet of the valve (73); When the single-stage chute (41) is in the vertical clearance position, the first sealing ring (72) and the second sealing ring (74) are coaxially connected and pressed together to form an airflow channel connecting the air supply assembly (8) and the first slit nozzle (42).

10. A multi-point sampling system for a belt conveyor according to claim 6 or 7, characterized in that, It also includes a gas supply component (8) and a docking component (7); The tail end of the first-stage chute (43) is provided with a second slit nozzle (45), which is flush with the bottom wall of the first-stage chute (43). The telescopic chute assembly is configured such that when in the vertical folding clearance position, the second-stage chute (44) retracts to the first-stage chute (43), and a third slit nozzle (46) is formed between the outer wall of the tail of the first-stage chute (43) and the inner wall of the tail of the second-stage chute (44). The air supply assembly (8) is used to simultaneously output compressed air to the second slit nozzle (45) and the third slit nozzle (46) to form air knives that respectively blow the inner wall of the first-stage chute (43) and the inner wall of the second-stage chute (44). The docking assembly (7) is used to connect the air supply assembly (8) with the second slit nozzle (45) and the third slit nozzle (46) when the telescopic chute assembly is in the vertical folding clearance position, and to separate when the telescopic chute assembly is in the horizontal unfolding sampling position. The docking component (7) includes: An air intake shroud (71) is installed on the outside of the first-stage chute (43) and covers the second slit nozzle (45) and the third slit nozzle (46). The first sealing ring (72) is installed at the air inlet of the air inlet cover (71); A valve (73) is mounted on the frame, and the air inlet of the valve (73) is connected to the air supply assembly (8). The second sealing ring (74) is installed at the outlet of the valve (73); When the telescopic chute assembly is in the vertical folding clearance position, the first sealing ring (72) and the second sealing ring (74) are coaxially connected and pressed together to form an airflow channel connecting the air supply assembly (8) and the air intake hood (71).

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