A dynamic weighing device for coal quality detection

Abstract

The utility model discloses a kind of dynamic weighing devices for coal quality detection, comprising: rack, carousel mechanism, balance weighing mechanism, wind shield mechanism and feeding mechanism and control mechanism;Carousel mechanism is liftable and is set on rack, the periphery of carousel mechanism is evenly provided with multiple sample grooves, balance weighing mechanism is set below carousel mechanism and can weigh sample on carousel mechanism, wind shield mechanism is set to one side of carousel mechanism and wind shield mechanism can form the cavity with upper end opening around the discharge port of feeding mechanism and sample to avoid the interference of airflow in sample weighing and sample adding process, carousel mechanism, balance weighing mechanism, wind shield mechanism and feeding mechanism are electrically connected with control mechanism.The dynamic weighing device solves the problem that traditional weighing device cannot operate carousel during weighing process by the cooperation of balance weighing mechanism and carousel mechanism, realizes the parallel operation of weighing and feeding, and greatly improves the efficiency of coal quality detection.

Description

Technical Field

[0001] This utility model belongs to the field of coal quality analysis technology, and specifically discloses a dynamic weighing device for coal quality testing. Background Technology

[0002] In intelligent coal quality testing systems, automatic weighing devices are one of the key pieces of equipment, used to weigh crucibles for testing items such as calorific value, total sulfur, carbon, hydrogen and nitrogen, moisture, ash content, and volatile matter. Traditional automatic weighing devices typically use a single turntable structure with a balance underneath. During operation, the turntable needs to be rotated to a designated position and then fixed. The weighing is then completed by the rotation and lifting of the turntable in conjunction with the balance below.

[0003] However, this traditional weighing device has the following drawbacks:

[0004] 1. The turntable cannot rotate during the weighing process, which prevents the robot from simultaneously adding clean crucibles or removing weighed crucibles. It must wait until all crucibles have been weighed before it can be processed in a centralized manner, which seriously affects the efficiency of the operation.

[0005] 2. The robot needs to transfer all weighed crucibles (e.g., 12) and reposition an equal number of new crucibles at once, requiring up to 24 operations. Assuming each operation takes 15 seconds, the loading and unloading process alone takes nearly 6 minutes and occupies all of the robot's working time.

[0006] 3. The rotation of the turntable can easily cause airflow interference, affecting weighing accuracy; the feeding control accuracy is insufficient, making it difficult to reliably meet the national standard quality requirements for different testing items.

[0007] Therefore, there is an urgent need for a device that can achieve dynamic weighing, improve work efficiency, and ensure weighing accuracy. Utility Model Content

[0008] (a) Technical problems to be solved

[0009] Based on this, the present invention provides a dynamic weighing device for coal quality testing, so as to realize dynamic weighing, improve weighing efficiency and ensure weighing accuracy.

[0010] (II) Technical Solution

[0011] To solve the above-mentioned technical problems, this utility model proposes a dynamic weighing device for coal quality testing, which includes: a frame, a turntable mechanism, a balance weighing mechanism, a windbreak mechanism, a feeding mechanism, and a control mechanism.

[0012] The turntable mechanism is vertically and flexibly mounted on the frame. Multiple sample slots are evenly arranged around the outer periphery of the turntable mechanism. The balance weighing mechanism is located below the turntable mechanism and can weigh the sample on the turntable mechanism. The windbreak mechanism is located on one side of the turntable mechanism and can form an open cavity at the top around the discharge port of the feeding mechanism and the sample to avoid airflow interference during sample weighing and feeding. The turntable mechanism, balance weighing mechanism, windbreak mechanism and feeding mechanism are all electrically connected to the control mechanism.

[0013] Preferably, the turntable mechanism includes a turntable, a turntable rotation motor, and a turntable lifting assembly;

[0014] The turntable lifting assembly is mounted on the frame, and the turntable rotation motor is located at the output end of the turntable lifting assembly. The output end of the turntable rotation motor is connected to the turntable to drive the turntable to rotate. A plurality of sample slots are evenly arranged on the outer periphery of the turntable.

[0015] Preferably, the balance weighing mechanism includes a T-shaped strut assembly or a C-shaped strut assembly; one end of the T-shaped strut assembly or the C-shaped strut assembly is located below the sample slot of the turntable, and the sample weighing is completed when both ends of the T-shaped strut assembly or the C-shaped strut assembly are horizontal.

[0016] Preferably, the T-shaped strut assembly includes a T-shaped strut and a strut counterweight. One end of the T-shaped strut is located below the sample slot of the turntable, and the other end of the T-shaped strut is provided with the strut counterweight.

[0017] Preferably, the C-shaped strut assembly includes a C-shaped strut and a strut counterweight. The C-shaped strut includes a weighing section located below the sample slot of the turntable, a counterweight section located below the weighing section, and a connecting section connecting the weighing section and the counterweight section. One end of the counterweight section is connected to the weighing section through the connecting section, and the other end of the counterweight section is provided with the strut counterweight. One end of the weighing section is connected to the counterweight section through the connecting section, and the other end of the weighing section is provided with a weighing position for contacting the weighed sample.

[0018] Preferably, the windbreak mechanism includes a windproof motor and a pair of windproof covers;

[0019] The windproof cover motor is mounted on the frame, and both ends of the windproof cover motor are connected to the windproof cover respectively. The paired windproof covers can be matched and connected to form a cavity with an opening at the top.

[0020] Preferably, the feeding mechanism includes a feeding scoop, an electric telescopic rod, and a rotary motor;

[0021] The rotary motor is mounted on the frame, one end of the electric telescopic rod is connected to the rotary motor, and the other end of the electric telescopic rod is provided with the material scoop so that the material scoop can move above the sample tank.

[0022] This utility model also provides a weighing method for a dynamic weighing device, characterized in that the weighing method of the dynamic weighing device is implemented according to the above-mentioned dynamic weighing device for coal quality testing, and the weighing method includes:

[0023] S1. Place multiple clean crucibles into the corresponding sample slots on the turntable, and calibrate the feeding mechanism using the control mechanism.

[0024] S2, Dynamic Weighing:

[0025] a. The turntable rotates, moving the target sample cell to the balance weighing mechanism;

[0026] b. When the windproof mechanism is working, the pairs of windproof covers are connected to form a windproof cavity. The turntable descends, and the support rod of the balance weighing mechanism lifts the target crucible through the sample slot, causing the crucible to detach from the turntable. A counterweight of preset weight is placed at the other end of the support rod.

[0027] c. The feeding mechanism feeds material into the crucible and adjusts the feeding amount in real time until the support rod is horizontal;

[0028] d. After feeding is completed, the turntable rises, the target crucible falls back to the turntable, the windbreak mechanism closes, and the paired windproof covers open;

[0029] e. The turntable rotates to the next target station, and steps bd are repeated. At the same time, the crucible in the sample cell that has been weighed is removed and the unweighed crucible is placed back in the sample cell.

[0030] S3. Repeat the process until all crucibles have been weighed.

[0031] (III) Beneficial Effects

[0032] Compared with existing technologies, the dynamic weighing device and testing method for coal quality testing of this invention have the following advantages:

[0033] This dynamic weighing device, through the coordinated design of the balance weighing mechanism and the turntable mechanism, solves the problem that traditional weighing devices can only weigh and transfer all crucibles at once during the weighing process, and cannot operate the turntable to load and unload materials during the weighing process. This dynamic weighing device enables parallel operation of weighing and loading / unloading materials, greatly improving the efficiency of coal quality testing. Compared with traditional weighing devices, this dynamic weighing device is more flexible and convenient in the coal quality weighing process.

[0034] Furthermore, the arrangement of the windbreak mechanism around the balance weighing mechanism and the feeding mechanism ensures that when the turntable of the dynamic weighing device rotates, the windbreak mechanism can effectively prevent the airflow generated by the rotation of the turntable from affecting the weighing accuracy. At the same time, it can also prevent the external airflow from affecting the feeding process. This not only ensures the weighing accuracy of the dynamic weighing device, but also further prevents the sample from splashing during the feeding process, thus improving the environmental friendliness of the dynamic weighing device.

[0035] The balance weighing mechanism uses a T-shaped or C-shaped strut assembly in conjunction with the turntable sample compartment, allowing the crucible to be separated from the turntable and weighed by a single action of raising and lowering the turntable. This simplifies the mechanical structure and reduces the failure rate. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the overall structure of the dynamic weighing device for coal quality testing according to this utility model.

[0038] Figure 2 This is a schematic diagram of the rotary table mechanism of the dynamic weighing device for coal quality testing according to this utility model.

[0039] Figure 3 This is a schematic diagram of the balance weighing mechanism of the dynamic weighing device for coal quality testing according to this utility model.

[0040] Figure 4 This is a schematic diagram of the T-shaped strut assembly structure of the dynamic weighing device for coal quality testing according to this utility model;

[0041] Figure 5 This is a schematic diagram of the C-type strut assembly structure of the dynamic weighing device for coal quality testing according to this utility model.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Balance weighing mechanism; 2. Windproof cover; 3. Feeding scoop; 4. Windproof cover motor; 5. Rotary motor; 6. Turntable; 7. Crucible; 8. Turntable lifting assembly; 9. Turntable rotation motor; 10. T-shaped support rod; 11. Support rod counterweight; 12. C-shaped support rod. Detailed Implementation

[0044] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0045] The following is in conjunction with the appendix Figure 1-5 The present invention provides a further description of the dynamic weighing device for coal quality testing and its testing method.

[0046] Please refer to this carefully. Figure 1-2 This utility model discloses a dynamic weighing device for coal quality testing. The dynamic weighing device for coal quality testing includes: a frame, a turntable mechanism, a balance weighing mechanism 1, a windbreak mechanism, a feeding mechanism, and a control mechanism. The turntable mechanism is vertically mounted on the frame, and multiple sample slots are evenly arranged around the outer periphery of the turntable mechanism. The balance weighing mechanism 1 is located below the turntable mechanism and can weigh the sample on the turntable mechanism. The windbreak mechanism is located on one side of the turntable mechanism and can form an open cavity at the top around the discharge port of the feeding mechanism and the sample to avoid airflow interference during sample weighing and feeding. The turntable mechanism, the balance weighing mechanism 1, the windbreak mechanism, and the feeding mechanism are all electrically connected to the control mechanism.

[0047] In this embodiment, the dynamic weighing device, through the coordinated arrangement of the balance weighing mechanism 1 and the turntable mechanism, solves the problem of traditional weighing devices that can only weigh and transfer all crucibles 7 at once during the weighing process, and cannot operate the turntable 6 for loading and unloading during the weighing process. This allows the dynamic weighing device to achieve parallel operation of weighing and loading / unloading, significantly improving the efficiency of coal quality testing. Compared to traditional weighing devices, the dynamic weighing device is more flexible and convenient in the coal quality weighing process. Furthermore, the arrangement of the windbreak mechanism around the balance weighing mechanism 1 and the feeding mechanism ensures that when the turntable 6 rotates, the windbreak mechanism effectively avoids the impact of airflow generated by the rotation of the turntable 6 on the weighing accuracy. It also avoids the influence of external airflow on the feeding process, ensuring the weighing accuracy of the dynamic weighing device and further preventing sample splashing during the feeding process, thus improving the environmental friendliness of the dynamic weighing device. Preferably, the control mechanism uses a controller employing a PID control algorithm.

[0048] In a preferred embodiment, the turntable mechanism includes a turntable 6, a turntable rotation motor 9, and a turntable lifting assembly 8. The turntable lifting assembly 8 is mounted on the frame, and the turntable rotation motor 9 is located at the output end of the turntable lifting assembly 8. The output end of the turntable rotation motor 9 is connected to the turntable 6 to drive the turntable 6 to rotate. Multiple sample slots are evenly distributed around the outer periphery of the turntable 6. In this embodiment, the turntable lifting assembly 8 includes a lifting motor and a lifting rod. The lifting rod is electrically connected to the lifting motor. One end of the lifting rod is fixedly mounted on the frame, and the other end is connected to the turntable 6. The length of the lifting rod is greater than the height of the crucible 7 in the sample slot and not less than 20 mm.

[0049] like Figure 3-5 As shown, the balance weighing mechanism 1 includes a T-shaped support rod 10 assembly or a C-shaped support rod 12 assembly. One end of the T-shaped support rod 10 assembly or the C-shaped support rod 12 assembly is positioned below the sample slot of the turntable 6. When both ends of the T-shaped support rod 10 assembly or the C-shaped support rod 12 assembly are horizontal, the sample weighing is completed. The T-shaped support rod 10 assembly includes a T-shaped support rod 10 and a support rod counterweight 11. One end of the T-shaped support rod 10 is positioned below the sample slot of the turntable 6, and the other end of the T-shaped support rod 10 is equipped with the support rod counterweight 11. The C-shaped strut assembly 12 includes a C-shaped strut 12 and a strut counterweight 11. The C-shaped strut 12 includes a weighing section located below the sample compartment of the turntable 6, a counterweight section located below the weighing section, and a connecting section connecting the weighing section and the counterweight section. One end of the counterweight section is connected to the weighing section via the connecting section, and the other end of the counterweight section is equipped with the strut counterweight 11. One end of the weighing section is connected to the counterweight section via the connecting section, and the other end of the weighing section is provided with a weighing position for contacting the sample to be weighed. In this embodiment, by adopting a T-shaped or C-shaped balance structure and the matching design of the sample compartment of the turntable 6, the crucible 7 can be separated from the turntable 6 and the weighing state can be achieved by only one action of raising and lowering the turntable 6, simplifying the mechanical structure and reducing the failure rate.

[0050] In a preferred embodiment, see Figure 2 The windproof mechanism includes a windproof cover motor 4 and a pair of windproof covers 2. The windproof cover motor 4 is mounted on the frame, and both ends of the windproof cover motor 4 are connected to the windproof covers 2 respectively. The pair of windproof covers 2 can be matched and connected to each other to form a cavity with an opening at the top.

[0051] In this embodiment, a control mechanism links the windbreak mechanism with the turntable 6. When the turntable 6 rotates, it rotates the target sample tank to the balance weighing mechanism 1, where the windbreak mechanism operates, and the paired wind shields 2 are connected to form a windproof cavity. When the turntable 6 rises, the target crucible 7 falls back to the turntable 6, the windbreak mechanism closes, and the paired wind shields 2 open. The arrangement of the windbreak mechanism around the balance weighing mechanism 1 and the feeding mechanism ensures that when the turntable 6 of the dynamic weighing device rotates, the wind shields 2 can effectively prevent the airflow generated by the rotation of the turntable 6 from affecting the weighing accuracy, and also prevent the external airflow from affecting the feeding process. This ensures the weighing accuracy of the dynamic weighing device and further prevents sample splashing during the feeding process, improving the environmental friendliness of the dynamic weighing device.

[0052] Furthermore, the feeding mechanism includes a feeding scoop 3, an electric telescopic rod, and a rotary motor 5. The rotary motor 5 is mounted on the frame, one end of the electric telescopic rod is connected to the rotary motor 5, and the other end of the electric telescopic rod is equipped with the feeding scoop 3 so that the feeding scoop 3 can move above the sample tank. For details of the feeding mechanism, please refer to CN202411798885.4 - An Automatic Sample Weighing Instrument. The PID control algorithm in the control mechanism has a control cycle of 100ms, thereby achieving a feeding accuracy of 0.9-1.1g (calorific value) and 45-55mg (total sulfur).

[0053] This utility model also provides a weighing method for a dynamic weighing device, which is based on the aforementioned dynamic weighing device for coal quality testing. The weighing method includes:

[0054] S1. Place multiple clean crucibles 7 into the corresponding sample slots of the turntable 6, and calibrate the feeding mechanism using the control mechanism.

[0055] S2, Dynamic Weighing:

[0056] a. Rotate turntable 6 to move the target sample cell to the balance weighing mechanism 1;

[0057] b. When the windproof mechanism is working, the pairs of windproof covers 2 are connected to form a windproof cavity, the turntable 6 descends, and the support rod of the balance weighing mechanism 1 lifts the target crucible 7 through the sample slot, causing the crucible 7 to detach from the turntable 6. A counterweight of preset weight is placed at the other end of the support rod.

[0058] c. The feeding mechanism feeds material into the crucible 7 and adjusts the feeding amount in real time until the support rod is horizontal;

[0059] d. After feeding is completed, turntable 6 rises, target crucible 7 falls back to turntable 6, windbreak mechanism closes, and paired wind shields 2 open;

[0060] e. Rotate turntable 6 to the next target station and repeat steps bd. At the same time, remove crucible 7 from the sample cell that has been weighed and place the unweighed crucible 7 back in.

[0061] S3. Repeat the process until all crucibles 7 have been weighed.

[0062] Based on the above-described dynamic weighing device, the first embodiment of this utility model is as follows:

[0063] Turntable mechanism: A circular turntable 6 with a diameter of 600mm is used, with 12 crucible 7 stations evenly distributed. The preferred material is 304 stainless steel. A sample slot with a width of 30mm is provided on the edge of the turntable 6 corresponding to the balance position for the balance support rod to be inserted and for robot operation. The turntable 6 is driven by a servo motor, and the speed is adjustable (0-10r / min).

[0064] Weighing mechanism 1: It adopts a C-shaped balance support rod, preferably made of titanium alloy (lightweight design), and the top of the support rod is equipped with a positioning groove for crucible 7; the balance accuracy is 0.1mg, and the maximum weighing range is 220g; the lifting stroke of the turntable 6 is 50mm (15mm more than the traditional one), ensuring that the crucible 7 is completely detached from the turntable 6.

[0065] Windshield mechanism: includes an annular windshield (100mm high) fixed to the frame and a movable windshield (2mm thick acrylic plate) linked to the turntable 6. The movable windshield is electromagnetically driven and has a response time of <0.5s.

[0066] Precision feeding mechanism: linear motor with a stroke of 10mm and a speed adjustment range of 0-10mm / s; feeding adjustment accuracy of 0.1mm; PID controller parameters: proportional coefficient Kp = 8, integral time Ti = 0.5s, derivative time Td = 0.1s, control cycle 100ms.

[0067] Furthermore, a robot collaboration system is set up, which adopts a 6-axis industrial robot with a repeatability of ±0.02mm and a working radius of 1400mm. It communicates with the turntable 6 control system via Modbus / TCP bus to achieve real-time linkage.

[0068] Based on the dynamic weighing device of Embodiment 1 above, the steps of the dynamic weighing method provided by this utility model are as follows: S1. The robot places 4 calorific value crucibles 7, 2 total sulfur crucibles 7, 2 hydrocarbon nitrogen crucibles 7, 2 moisture crucibles 7, 1 ash crucible 7, and 1 volatile matter crucible 7 on turntables 61-12 respectively; the control mechanism calibrates the balance, and the feeding mechanism performs a no-load test.

[0069] S2. Dynamic weighing:

[0070] a. Rotate turntable 6 at a speed of 5 r / min to move the No. 1 calorific crucible 7 to the weighing area of ​​the balance, and then stop rotating turntable 6;

[0071] b. The movable wind deflector opens, the turntable 6 descends 50mm, the C-shaped balance support lifts crucible 7 (No. 1) so that it is detached from the turntable 6, and the balance is zeroed (stabilization time <1s);

[0072] c. The precision feeding system is started. After the coal sample is taken by a quantitative spoon, the linear motor drives the feeding mechanism. The PID algorithm adjusts the parameters according to the real-time feedback from the balance, and finally controls the feeding amount at 1.00±0.1g.

[0073] d. After feeding is completed, turntable 6 rises 50mm, crucible 7 falls back to turntable 6, and the movable baffle closes;

[0074] e. Turntable 6 continues to rotate to station 7 of full sulfur crucible 2, and repeats steps bd, with the feed rate controlled at 50±5mg; at the same time, the robot takes away the weighed crucible 7 at station 1 through the notch of turntable 6 and places a new clean calorific value crucible 7.

[0075] S3. Cyclic operation: After completing the weighing of 3 stations, the robot simultaneously completes 3 pick-up and put-down operations. During the entire weighing process of 12 stations, the robot has no idle waiting time, and the total operation time is reduced by about 65% compared with the traditional method.

[0076] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; and they can also refer to a "transmission connection," that is, a power connection through various suitable methods such as belt drive, gear drive, or sprocket drive. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A dynamic weighing device for coal quality testing, characterized in that, The dynamic weighing device for coal quality testing includes: a frame, a turntable mechanism, a balance weighing mechanism, a windbreak mechanism, a feeding mechanism, and a control mechanism; The turntable mechanism is vertically and flexibly mounted on the frame. Multiple sample slots are evenly arranged around the outer periphery of the turntable mechanism. The balance weighing mechanism is located below the turntable mechanism and can weigh the sample on the turntable mechanism. The windbreak mechanism is located on one side of the turntable mechanism and can form an open cavity at the top around the discharge port of the feeding mechanism and the sample to avoid airflow interference during sample weighing and feeding. The turntable mechanism, balance weighing mechanism, windbreak mechanism and feeding mechanism are all electrically connected to the control mechanism.

2. The dynamic weighing device for coal quality testing according to claim 1, characterized in that, The turntable mechanism includes a turntable, a turntable rotation motor, and a turntable lifting assembly; The turntable lifting assembly is mounted on the frame, and the turntable rotation motor is located at the output end of the turntable lifting assembly. The output end of the turntable rotation motor is connected to the turntable to drive the turntable to rotate. A plurality of sample slots are evenly arranged on the outer periphery of the turntable.

3. The dynamic weighing device for coal quality testing according to claim 2, characterized in that, The balance weighing mechanism includes a T-shaped strut assembly or a C-shaped strut assembly; one end of the T-shaped strut assembly or the C-shaped strut assembly is located below the sample slot of the turntable, and the sample weighing is completed when both ends of the T-shaped strut assembly or the C-shaped strut assembly are horizontal.

4. The dynamic weighing device for coal quality testing according to claim 3, characterized in that, The T-shaped strut assembly includes a T-shaped strut and a strut counterweight. One end of the T-shaped strut is located below the sample slot of the turntable, and the other end of the T-shaped strut is provided with the strut counterweight.

5. The dynamic weighing device for coal quality testing according to claim 3, characterized in that, The C-shaped strut assembly includes a C-shaped strut and a strut counterweight. The C-shaped strut includes a weighing section located below the sample slot of the turntable, a counterweight section located below the weighing section, and a connecting section connecting the weighing section and the counterweight section. One end of the counterweight section is connected to the weighing section through the connecting section, and the other end of the counterweight section is provided with the strut counterweight. One end of the weighing section is connected to the counterweight section through the connecting section, and the other end of the weighing section is provided with a weighing position for contacting the weighed sample.

6. The dynamic weighing device for coal quality testing according to claim 1, characterized in that, The windbreak mechanism includes a windproof motor and a pair of windproof covers; The windproof cover motor is mounted on the frame, and both ends of the windproof cover motor are connected to the windproof cover respectively. The paired windproof covers can be matched and connected to form a cavity with an opening at the top.

7. The dynamic weighing device for coal quality testing according to claim 1, characterized in that, The feeding mechanism includes a feeding spoon, an electric telescopic rod, and a rotary motor; The rotary motor is mounted on the frame, one end of the electric telescopic rod is connected to the rotary motor, and the other end of the electric telescopic rod is provided with the material scoop so that the material scoop can move above the sample tank.

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