Chute sampling device

Abstract

The invention relates to the field of chute sampling, in particular to a chute sampling device which comprises a driver, a four-bar mechanism and a chute body, and the driver drives the chute body to perform reciprocating turnover motion between a vertical avoiding position and a horizontal sampling position through the four-bar mechanism; the four-bar mechanism comprises a fixed hinged support, a coupling support, a front driving swing arm and a rear follow-up swing arm. The fixed hinged support is fixed on the side part of a rack at the conveying tail end of the belt conveyor; the coupling bracket is fixed on the chute body; the output end of the driver is connected with the front driving swing arm and used for driving the front driving swing arm to swing. According to the invention, the chute body is driven by the driver and the four-bar mechanism to perform reciprocating turnover motion between the vertical avoiding position and the horizontal sampling position, and the sampling time length and the sampling quantity depend on the speed and the time length of the chute body executing action instead of the volume of a sampling bin; therefore, the sampling quantity can be dynamically adjusted according to the dynamic fluctuation of the material flow on the belt.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chute sampling, in particular to a chute sampling device. BACKGROUND

[0002] In the industrial production and conveying process of ores, coal and bulk materials, timely and accurate sampling of the materials on the belt conveyor is the core link for product quality control, process parameter adjustment and trade settlement.

[0003] However, the conventional chute sampling method has the technical defect of large sampling error: the existing chute sampling device all includes a horizontally moving sampling bin, and the sampling quantity depends on the volume of the sampling bin itself, which leads to unadjustable sampling quantity and inability to match the dynamic fluctuation of the material flow on the belt in real time, so that the sampled sample cannot truly reflect the average characteristics of the whole batch of materials.

[0004] Therefore, how to design a chute sampling device capable of changing the sampling quantity according to the real-time flow of materials is a technical problem to be solved in the field. SUMMARY

[0005] The present application aims to provide a chute sampling device to solve the technical problem that the existing chute sampling device has unadjustable sampling quantity and cannot be dynamically adjusted in real time according to the dynamic fluctuation of the material flow on the belt, so that the sampled sample cannot truly reflect the average characteristics of the whole batch of materials.

[0006] To solve the above technical problems, the present application specifically provides the following technical scheme: A chute sampling device, comprising a driver, a four-bar linkage mechanism and a chute body, the driver drives the chute body to reciprocatingly flip between a vertical avoiding position and a horizontal sampling position through the four-bar linkage mechanism; Wherein, the four-bar linkage mechanism comprises a fixed hinge base, a coupling bracket, a front driving swing arm and a rear 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 point away from the belt conveyor and a second hinge point close to the belt conveyor; The coupling bracket is fixed on the chute body, and the coupling bracket is provided with a third hinge point away from the belt conveyor and a fourth hinge point close to the belt conveyor; The two ends of the front driving swing arm are respectively hinged to the first hinge point and the third hinge point, and the output end of the driver is connected with the front driving swing arm for driving the front driving swing arm to swing; The two ends of the rear following swing arm are respectively hinged to the second hinge point and the fourth hinge point.

[0007] Further, the geometric dimensions of the four-bar linkage are configured as: When the front driving swing arm drives the chute body to swing towards the direction away from the belt conveyor to the vertical avoidance position, the chute body is vertically stored beside the belt conveyor; When the front driving swing arm drives the chute body to swing towards the direction close to the belt conveyor to the horizontal sampling position, the chute body is in an attitude with an included angle of 2°-5° with the horizontal plane, unfolded below the end of the belt conveyor, and the vertical height of the middle part of the chute body is lower than the vertical height of the tail part of the chute body.

[0008] Further, the distance between the first and second hinge points is equal to the distance between the third and fourth hinge points; the length of the rear follow-up swing arm is greater than the length of the front driving swing arm.

[0009] Further, the rear follow-up swing arm is a curved rod, and the middle part of the rear follow-up swing arm has a convex part curved towards the direction away from the belt conveyor; when the chute body is in the horizontal sampling position, the convex part bypasses the edge of the rack of the belt conveyor.

[0010] Further, the driver includes a motor and a speed reducer, and the output shaft of the motor is rigidly connected to one end of the front driving swing arm through the speed reducer.

[0011] Further, an online weight detection module is further included, and the online weight detection module includes a floating roller set and a pressure sensor assembly; the floating roller set replaces a part of the roller set of the belt conveyor; The floating roller set is separated from the rack of the belt conveyor and supported on the pressure sensor assembly, the pressure sensor assembly is fixedly connected to the rack of the belt conveyor, and the pressure sensor assembly is used to detect the total weight of the floating roller set, the belt above the floating roller set and the material; A control unit is further included, and the control unit is configured to receive the signal output by the pressure sensor assembly and calculate the real-time distribution density of the material according to the real-time weight of the material passing through the floating roller set.

[0012] Further, an online humidity detection module is further included, and the online humidity detection module is arranged on the chute body; the online humidity detection module includes a wear-resistant window and a near-infrared spectrometer; The wear-resistant window replaces part of the bottom wall of the chute body, the probe of the near-infrared spectrometer is fixedly connected to the outer side of the chute body, and the detection end of the probe faces the wear-resistant window; The control unit is configured to receive the signal output by the near-infrared spectrometer and correct the real-time distribution density according to the real-time humidity of the material passing through the wear-resistant window.

[0013] Further, the chute sampling device further comprises a gas supply assembly, a slit nozzle is arranged at the tail of the chute body and flush with the bottom wall of the chute body, and the gas supply assembly is used to output compressed air to the slit nozzle to form an air knife for blowing the inner wall of the chute body.

[0014] Further, the chute sampling device further comprises a docking assembly, which is used to connect the gas supply assembly and the slit nozzle when the chute body is in the vertical avoiding position and separate the gas supply assembly and the slit nozzle when the chute body is in the horizontal sampling position. The docking assembly comprises: an air inlet cover, which is installed outside the chute body and covers the slit nozzle; a first sealing ring, which is installed at the air inlet of the air inlet cover; a valve, which is installed on the rack, and the air inlet of the valve is connected to the gas supply assembly; a second sealing ring, which is installed at the air outlet of the valve; When the chute body is in the vertical avoiding 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 slit nozzle.

[0015] Further, the gas supply assembly comprises an air cylinder and an air compressor, and the air compressor, the air cylinder and the valve are sequentially connected.

[0016] Compared with the prior art, the present application has the following beneficial effects: The chute sampling device drives the chute body to perform reciprocating flipping motion between the vertical avoiding position and the horizontal sampling position through the driver and the four-bar linkage mechanism, and the sampling time and the sampling quantity depend on the speed and the time of the chute body performing the action, rather than the volume of the sampling bin, so that the sampling quantity of the present application can be dynamically adjusted according to the dynamic fluctuation of the material flow on the belt. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order 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 the 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 without creative labor on the basis of the provided drawings.

[0018] Figure 1 Front view of vertical avoiding position in working condition for the embodiment of the present application; Figure 2 Front view of horizontal sampling position in working condition for the embodiment of the present application; Figure 3 Perspective view of horizontal sampling position in working condition for the embodiment of the present application; Figure 4 Perspective view of vertical avoiding position for the embodiment of the present application; Figure 5 Perspective view of horizontal sampling position for the embodiment of the present application; Figure 6 Side view of vertical avoiding position for the embodiment of the present application; Figure 7 A-A direction sectional view of Figure 6 The reference numerals in the drawings represent the following respectively: 1-belt conveyor; 2-driver; 21-motor; 22-reducer; 3-four-bar linkage; 31-fixed hinge bracket; 32-coupling support; 33-front driving swing arm; 34-rear following swing arm; 341-protruding part; 35-first hinge point; 36-second hinge point; 37-third hinge point; 38-fourth hinge point; 4-chute body; 41-slit nozzle; 5-on-line weight detection module; 51-floating roller group; 52-pressure sensor assembly; 6-on-line humidity detection module; 61-wear-resistant window; 62-probe; 7-docking assembly; 71-air inlet cover; 72-first sealing ring; 73-valve; 74-second sealing ring; 8-gas supply assembly. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely 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 of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0020] In the industrial production and conveying process of ores, coal and bulk materials, timely and accurate sampling of the materials on the belt conveyor 1 is a core link for product quality control, process parameter adjustment and trade settlement. However, the traditional chute sampling method has the following technical defects.

[0021] ​Large sampling error: the existing chute sampling device includes a horizontally moving sampling bin, and the sampling amount depends on the volume of the sampling bin itself, which leads to an unadjustable sampling amount and cannot match the dynamic fluctuation of the material flow on the belt in real time, so that the sampled sample cannot truly reflect the average characteristics of the whole batch of materials.

[0022] Sample cross-contamination: after sampling, the chute is prone to material residue and adhesion inside, causing cross-contamination during the next sampling.

[0023] The purpose of the present application is to provide a chute sampling device based on real-time density feedback, which aims to intelligently determine the sampling time according to the real-time flow of the material, and automatically and thoroughly clean itself after each sampling is completed.

[0024] Reference Figure 1 and Figure 2 , the material is conveyed by the belt conveyor 1, and after the material reaches the conveying end of the belt conveyor 1, it naturally falls and reaches the downstream conveying equipment or collection equipment. The present application provides a chute sampling device, which includes a chute body 4 arranged at the conveying end of the belt conveyor 1, which is used to flip out during sampling, intercept the material during falling, and move the material to the sample collection bucket.

[0025] Reference Figure 4 and Figure 5 , the device includes a driver 2, a four-bar linkage mechanism 3 and a chute body 4. The driver 2 drives the chute body 4 to make reciprocating flipping motion between the vertical avoiding position (as shown in Figure 1 and the horizontal sampling position (as shown in Figure 2 ).

[0026] The driver 2 includes a motor 21 and a 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 reducer 22, providing a large torque driving force.

[0027] The four-bar linkage mechanism 3 includes a fixed hinge base 31, a coupling bracket 32, a front driving swing arm 33 and a rear following 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.

[0028] The fixed hinge base 31 is fixed to the rack side of the conveying end of the belt conveyor 1 and is arranged horizontally. The first hinge point 35 away from the belt conveyor 1 and the second hinge point 36 close to the belt conveyor 1 are arranged on it.

[0029] The coupling bracket 32 is fixed on the chute body 4. The third hinge point 37 away from the belt conveyor 1 and the fourth hinge point 38 close to the belt conveyor 1 are arranged on it.

[0030] The front driving swing arm 33 connects the first hinge point 35 and the third hinge point 37. The output shaft of the reducer 22 of the driver 2 is rigidly connected to one end of the front driving swing arm 33 (at the first hinge point 35) to provide power for turning the chute body 4.

[0031] The rear following swing arm 34 connects the second hinge point 36 and the fourth hinge point 38 to follow the action of the front driving swing arm 33 and constrain the posture of the chute body 4.

[0032] The geometric dimensions of the four-bar linkage 3 in this embodiment are configured as follows: The length of the rear following swing arm 34 is greater than that of the front driving 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 causes the middle part of the chute body 4 to rotate relative to the tail part during movement, so that the chute body 4 can achieve a specific turning trajectory.

[0033] Reference Figure 1 The vertical avoidance position shown: when the front driving swing arm 33 drives the chute body 4 to swing towards the direction away from the belt conveyor 1, the middle part of the chute body 4 is inverted upwards relative to the tail part, and finally the chute body 4 is stored in a vertical posture beside the belt conveyor 1. In this state, the chute does not occupy the space below, which is convenient for maintenance and avoidance.

[0034] Reference Figure 2 The horizontal sampling position shown: when the front driving swing arm 33 drives the chute body 4 to swing towards the direction close to the belt conveyor 1, the middle part of the chute body 4 is inverted downwards relative to the tail part, and finally the chute body 4 is unfolded almost horizontally below the end of the belt conveyor 1. At this position, the chute body 4 is in a posture with an included angle of 2°~5° with the horizontal plane, and the vertical height of the middle part of the chute body 4 is lower than that of the tail part of the chute body 4, so that the material can smoothly flow along the chute body 4 to the sample collection bucket.

[0035] Further, since the frame of the belt conveyor 1 is very close to the movement path of the chute, the straight rod-shaped rear following swing arm 34 is very easy to collide with the frame of the belt conveyor 1 when it is inverted downwards.

[0036] To solve this problem, referring to Figure 2 and Figure 5 , the rear following swing arm 34 of this embodiment is designed as a specially designed curved rod, which has a convex part 341 (C-shaped) in the middle part that bends towards the direction away from the belt conveyor 1 (i.e. towards the side of the front driving swing arm 33). When the chute body 4 is in the horizontal sampling position, the convex part 341 can cleverly bypass the edge of the frame of the belt conveyor 1.

[0037] This design greatly enhances the insertion depth of the chute body 4, making it suitable for wider belt conveyors 1.

[0038] Further reference Figure 3 To address the issue of large errors in random or timed sampling, this device also includes an online weight detection module 5.

[0039] The online weight detection module 5 includes a floating idler group 51 and a pressure sensor assembly 52. ​​The floating idler group 51 replaces a portion of the idler group upstream of the belt conveyor 1. The floating idler group 51 is mechanically separated from the frame of the belt conveyor 1 and is supported as a whole on the pressure sensor assembly 52. ​​The pressure sensor assembly 52 is fixedly connected to the frame and is used to detect the total weight of the floating idler group 51, the belt above it, and the material. The control unit calculates the real-time distribution density of the material based on this.

[0040] The working principle of the online weight detection module 5: The pressure sensor component 52 transmits the signal to the control unit. The control unit receives the signal and calculates the real-time distribution density of the material based on the real-time weight (minus the tare weight). The control unit calculates the optimal timing and duration of the next sampling based on the density data, thereby realizing intelligent sampling based on flow fluctuations.

[0041] Furthermore, since material moisture content significantly affects weight data, and consequently the accuracy of density calculations, refer to... Figure 6 and Figure 7 The device also includes an online humidity detection module 6 integrated on the chute body 4, which includes a wear-resistant viewing window 61 (such as sapphire glass) and a near-infrared spectrometer.

[0042] The wear-resistant viewing window 61 replaces part of the bottom wall of the chute body 4 and is flush with the inner wall to prevent material blockage; the probe 62 of the near-infrared spectrometer is fixedly connected to the outside of the chute body 4, and the detection end of the probe 62 faces the wear-resistant viewing window 61.

[0043] The working principle of the online humidity detection module 6 is as follows: When the chute body 4 intercepts the material, the material slides through the wear-resistant window 61, and the probe 62 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.

[0044] Furthermore, when handling high-humidity, high-viscosity materials, the materials are very likely to adhere to the inner wall of the chute body 4 and the surface of the wear-resistant viewing window 61, 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 chute body 4.

[0045] The tail end of the chute body 4 is provided with a slit nozzle 41, which is flush with the bottom wall of the chute body 4. An air inlet hood 71 is installed on the outside of the chute body 4, and the air outlet of the air inlet hood 71 covers the slit nozzle 41. A first sealing ring 72 is installed at the air inlet of the air inlet hood 71.

[0046] 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 valve 73 is positioned so that it faces the air inlet of the air inlet hood 71 when the chute body 4 is in the vertical clearance position.

[0047] Purging process: Step 1, Mechanical docking: After each sampling is completed, the driver 2 drives the chute body 4 to flip back to the vertical clearance position (e.g., Figure 7 When the first sealing ring 72 and the second sealing ring 74 are automatically coaxially connected and pressed together, an airflow channel is formed connecting the air supply assembly 8 and the slit nozzle 41.

[0048] 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 slit nozzle 41 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 chute body 4 and the surface of the wear-resistant viewing window 61, blowing the residual material into the waste collection hopper below.

[0049] 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.

[0050] The purging action is completed automatically between two sampling intervals, effectively solving the problems of cross-contamination and window obstruction, and realizing maintenance-free operation of the device.

[0051] The beneficial effects of this invention are as follows: Intelligent sampling: Through the cooperation of online weight detection module 5 and online humidity detection module 6, the corrected material density is obtained in real time, and the sampling action is precisely controlled, so that the sampling is accurately synchronized with the fluctuation of material flow rate, thus solving the problem of large sampling error.

[0052] Self-cleaning: When the chute is in a vertical clearance position, the docking component 7 automatically connects to the air supply component 8, and forms an air knife through the slit nozzle 41 to automatically clean the chute body 4 and the wear-resistant window 61, thus solving the problems of sample cross-contamination and the wear-resistant window 61 being blocked.

[0053] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. A chute sampling device, characterized in that, It includes a driver (2), a four-bar linkage (3) and a chute body (4). The driver (2) drives the chute body (4) 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 front drive swing arm (33), and a rear follower swing arm (34). The fixed hinge (31) is fixed to the side of the frame at the conveying end of the belt conveyor (1). The fixed hinge (31) is provided with a first hinge point (35) away from the belt conveyor (1) and a second hinge point (36) close to the belt conveyor (1). The coupling bracket (32) is fixed on the chute body (4). The coupling bracket (32) is provided with a third hinge point (37) away from the belt conveyor (1) and a fourth hinge point (38) close to the belt conveyor (1). The two ends of the front drive swing arm (33) are respectively hinged to the first hinge point (35) and the third hinge point (37). The output end of the driver (2) is connected to the front drive swing arm (33) to drive the front drive swing arm (33) to swing. The two ends of the rear follower swing arm (34) are respectively hinged to the second hinge point (36) and the fourth hinge point (38).

2. The chute sampling device according to claim 1, characterized in that, The geometry of the four-bar linkage (3) is configured as follows: When the front drive swing arm (33) drives the chute body (4) to swing away from the belt conveyor (1) to the vertical clearance position, the chute body (4) is stored in a vertical position on the side of the belt conveyor (1). When the front drive swing arm (33) drives the chute body (4) to swing toward the direction close to the belt conveyor (1) to the horizontal sampling position, the chute body (4) is in an angle of 2°~5° with the horizontal plane, unfolds to the lower end of the belt conveyor (1), and the vertical height of the middle part of the chute body (4) is lower than the vertical height of the tail of the chute body (4).

3. The chute sampling device according to claim 2, characterized in that, 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); the length of the rear follower swing arm (34) is greater than the length of the front drive swing arm (33).

4. The chute sampling device according to claim 2, characterized in that, The rear follower swing arm (34) is a curved rod, and the middle part of the rear follower swing arm has a protrusion (341) that bends away from the belt conveyor (1); when the chute body (4) is in the horizontal sampling position, the protrusion (341) goes around the frame edge of the belt conveyor (1).

5. A chute sampling device according to claim 1, characterized in that, The driver (2) includes a motor (21) and a reducer (22), and the output shaft of the motor (21) is rigidly connected to one end of the front drive swing arm (33) through the reducer (22).

6. The chute sampling device according to claim 1, characterized in that, It also includes an online weight detection module (5), which includes a floating idler group (51) and a pressure sensor assembly (52), wherein the floating idler group (51) replaces a portion of the idler group of the belt conveyor (1); The floating idler group (51) is separated from the frame of the belt conveyor (1) and supported on the pressure sensor assembly (52). The pressure sensor assembly (52) is fixedly connected to the frame of the belt conveyor (1). The pressure sensor assembly (52) is used to detect the total weight of the floating idler group (51) and the belt and material above it. It also includes a control unit configured to receive a signal output by the pressure sensor assembly (52) and calculate the real-time distribution density of the material based on the real-time weight of the material passing through the floating roller group (51).

7. A chute sampling device according to claim 6, characterized in that, It also includes an online humidity detection module (6), which is disposed on the chute body (4). The online humidity detection module (6) includes: a wear-resistant window (61) and a near-infrared spectrometer; The wear-resistant window (61) replaces part of the bottom wall of the chute body (4), and the probe (62) of the near-infrared spectrometer is fixedly connected to the outside of the chute body (4), with the detection end of the probe (62) facing the wear-resistant window (61). The control unit is configured to receive the signal output by the near-infrared spectrometer and correct the real-time distribution density based on the real-time humidity of the material passing through the wear-resistant window (61).

8. A chute sampling device according to claim 1, characterized in that, It also includes an air supply assembly (8), and a slit nozzle (41) is provided at the tail of the chute body (4). The slit nozzle (41) is flush with the bottom wall of the chute body (4). The air supply assembly (8) is used to output compressed air to the slit nozzle (41) to form an air knife that blows the inner wall of the chute body (4).

9. A chute sampling device according to claim 8, characterized in that, It also includes a docking assembly (7), which is used to connect the air supply assembly (8) and the slit nozzle (41) when the chute body (4) is in the vertical clearance position, and to separate the air supply assembly (8) and the slit nozzle (41) when the chute body (4) is in the horizontal sampling position. The docking component (7) includes: An air intake shroud (71) is installed on the outside of the chute body (4) and covers the slit nozzle (41). The first sealing ring (72) is installed at the air inlet of the air inlet shroud (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 chute body (4) 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 slit nozzle (41).

10. A chute sampling device according to claim 9, characterized in that, The gas supply assembly (8) includes a gas storage cylinder and an air compressor, and the air compressor, the gas storage cylinder and the valve (73) are connected in sequence.

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