Online moisture detection device and its application, tobacco leaf moisture detection device

Abstract

The present invention discloses an on-line moisture detection device and its application, as well as a tobacco leaf moisture detection device. The on-line moisture detection device includes a floating bracket, a moisture detector, and a balancing mechanism. The moisture detector is installed on the floating bracket, and the floating bracket is installed directly above the raw material conveying device in the field of application. Its installation height can be set according to the lowest stacking height of the materials piled on the conveying device, so that the moisture detector can be in direct contact with the raw materials to detect the moisture content of the raw materials passing through the moisture detector. The balancing mechanism can balance the weights of the moisture detector and the floating bracket, so that the floating bracket can automatically float up and down with the stacking height of the raw materials on the conveying device, reducing the extrusion force of the floating bracket on the raw materials, making the raw materials on the conveying device in a natural and fluffy state, avoiding inaccurate measurement caused by the extrusion of the raw materials, achieving the purpose of eliminating the influence on the detection accuracy caused by inconsistent raw material stacking heights, and improving the moisture detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of on-line tobacco leaf moisture detection, and particularly relates to an on-line moisture detection device and its application, and a tobacco leaf moisture detection device. Background Art

[0002] In the tobacco preparation process flow, the control of the tobacco water content is extremely strict. Especially in processes such as raw material preparation and cut tobacco drying, the control of parameters such as the moisture content determines the grade of the cut tobacco. Therefore, it is necessary to detect the moisture content of the tobacco leaves fed into the flue-curing machine on the conveyor chain plate. The existing detection methods are mostly non-contact detection, and the detection accuracy is poor. Although the detection accuracy of the contact detection method is higher than that of the non-contact detection method, due to the inconsistent height of the tobacco leaves stacked everywhere on the conveyor chain plate, too high or too low stack height of the tobacco leaves will have a certain impact on the detection accuracy. Therefore, there is an urgent need for a technology that can improve the detection accuracy of tobacco leaf moisture. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the present invention provides an on-line moisture detection device and its application, and a tobacco leaf moisture detection device, which can eliminate the influence caused by inconsistent tobacco leaf height and improve the detection accuracy of tobacco leaf moisture.

[0004] In the first aspect, an on-line moisture detection device is provided, including:

[0005] A floating bracket;

[0006] A moisture detector, arranged on the floating bracket, and the detection direction is vertically downward;

[0007] A balance mechanism, connected to the moisture detector, and the balance mechanism is used to balance the weights of the moisture detector and the floating bracket.

[0008] Combined with the first aspect, in the first first realizable manner of the first aspect, the floating bracket includes:

[0009] A base;

[0010] A floating plate, arranged below the base, and provided with an installation hole, the moisture detector is embedded in the installation hole and fixedly connected to the floating plate;

[0011] Two groups of connecting rod groups, respectively arranged oppositely on both sides of the floating plate, and each group includes two connecting rods. The two ends of each connecting rod are respectively hinged or connected by bearings to the base and the floating plate, and the connection points of the two connecting rods with the floating plate and the base are distributed in a parallelogram.

[0012] Combined with the first first realizable manner of the first aspect, in the second realizable manner of the first aspect, the front end of the floating plate is upturned to form an inclined surface.

[0013] In combination with the first aspect, in the third realizable manner of the first aspect, the balance mechanism includes:

[0014] A pulley, disposed above the moisture detector;

[0015] A connecting rope, one end of which is connected with a counterweight having a weight equal to the combined weight of the moisture detector and the floating bracket, and the other end passes through the pulley and is vertically downwardly connected to the moisture detector.

[0016] In combination with the first aspect, in the fourth realizable manner of the first aspect, a height limiting mechanism is further included, and the height limiting mechanism is connected to the floating bracket for limiting the floating height of the floating bracket.

[0017] In combination with the first aspect, in the fifth realizable manner of the first aspect, a displacement detector is further included, and the displacement detector is used for detecting the displacement data of the floating bracket in the vertical direction.

[0018] In the second aspect, a tobacco leaf moisture detection device is provided, including any one of the moisture on-line detection devices in the first aspect and the first to fifth realizable manners of the first aspect, and the moisture on-line detection device is disposed above the conveying path of the conveying chain plate.

[0019] In the third aspect, an application of any one of the moisture on-line detection devices in the first aspect and the first to fifth realizable manners of the first aspect in PVC resin is provided, and the moisture on-line detection device is disposed on the feeding path of PVC raw materials.

[0020] In the fourth aspect, an application of any one of the moisture on-line detection devices in the first aspect and the first to fifth realizable manners of the first aspect in metallurgy is provided, and the moisture on-line detection device is disposed on the feeding path of metallurgical raw materials.

[0021] Advantageous effects: By using the moisture on-line detection device and its application and the tobacco leaf moisture detection device of the present invention, the balance mechanism provided can offset the extrusion force of the moisture detector and the floating bracket on the tobacco leaves, so that the floating bracket can float up and down with the stacking height of the tobacco leaves, so that the moisture detector always adheres to the surface of the tobacco leaves stacked on the conveying chain plate, so as to eliminate the influence on the detection accuracy caused by the inconsistent stacking height of the tobacco leaves and improve the detection accuracy of the tobacco leaf moisture. Description of the Drawings

[0022] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the specific embodiments will be briefly introduced below. In all the drawings, the components or parts do not necessarily draw according to the actual ratio.

[0023] Figure 1Structural schematic diagram of the on-line moisture detection device provided by an embodiment of the present invention;

[0024] Figure 2 is Figure 1 side view of the on-line moisture detection device shown;

[0025] Figure 3 Structural schematic diagram of the tobacco curing machine provided by an embodiment of the present invention;

[0026] Reference numerals:

[0027] 1 - floating bracket, 2 - moisture detector, 3 - balancing mechanism, 4 - base, 4a - base plate, 4b - cross beam, 5 - floating plate, 6 - connecting rod group, 7 - connecting rod, 8 - pulley, 9 - connecting rope, 10 - counterweight, 11 - retaining piece, 12 - displacement detector, 13 - sleeve, 14 - floating rod, 15 - conveyor chain plate, 16 - tobacco curing equipment. Detailed implementation manners

[0028] Hereinafter, embodiments of the technical solutions of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and thus are only examples and cannot be used to limit the protection scope of the present invention.

[0029] As Figure 1 structural schematic diagram of the on-line moisture detection device shown, the detection device includes:

[0030] Floating bracket 1;

[0031] Moisture detector 2, arranged on the floating bracket 1 and with the detection direction vertically downward;

[0032] Balancing mechanism 3, connecting the moisture detector 2, and the balancing mechanism 3 is used to balance the weights of the moisture detector 2 and the floating bracket 1.

[0033] Specifically, as Figure 1 , Figure 2 shown, the detection device is composed of a floating bracket 1, a moisture detector 2 and a balancing mechanism 3. Among them, the moisture detector 2 is installed on the floating bracket 1, and the floating bracket 1 is installed directly above the conveyor chain plate 15 of the tobacco curing machine, and its installation height can be set according to the lowest stacking height on the conveyor chain plate 15, so that the moisture detector 2 can be in direct contact with the tobacco leaves to detect the moisture content of the tobacco leaves passing through the moisture detector 2.

[0034] Moreover, the balancing mechanism 3 can balance the weights of the moisture detector 2 and the floating bracket 1, so that the floating bracket 1 can automatically float up and down with the stacking height of the tobacco leaves on the conveyor chain plate 15, reducing the extrusion force of the floating bracket 1 on the tobacco leaves, making the tobacco leaves on the conveyor chain plate 15 in a natural fluffy state, avoiding inaccurate measurement caused by the extrusion of the tobacco leaves, achieving the purpose of eliminating the influence of inconsistent stacking height of the tobacco leaves on the detection accuracy, and improving the moisture detection accuracy of the tobacco leaves.

[0035] In this embodiment, optionally, the floating bracket 1 includes:

[0036] A base 4;

[0037] A floating plate 5, disposed below the base 4 and provided with mounting holes, the moisture detector 2 is embedded in the mounting holes and fixedly connected to the floating plate 5;

[0038] Two sets of connecting rod groups 6, respectively oppositely disposed on both sides of the floating plate 5, and each includes two connecting rods 7. The two ends of the connecting rod 7 are respectively hinged or connected by bearings to the base 4 and the floating plate 5, and the connection points of the two connecting rods 7 with the floating plate 5 and the base 4 are distributed in a parallelogram.

[0039] Specifically, in this embodiment, the moisture detector 2 can adopt a microwave moisture detector 2, which can determine the moisture content of the tobacco leaves by the reflected signal of the tobacco leaves. However, while the moisture detector 2 receives the reflected signal of the tobacco leaves, it will also be interfered by the reflected signal of the conveyor chain plate 15 below.

[0040] For this reason, the floating bracket 1 can be composed of a base 4, a floating plate 5 and two sets of connecting rod groups 6. Among them, the base 4 includes a vertically arranged base 4a and a horizontally arranged cross beam 4b. The base 4a can be fixedly installed directly above the conveyor chain plate 15 inside the tobacco curing machine, and the cross beam 4b can be horizontally fixed on the base 4a along the feeding direction of the conveyor chain plate 15. The floating plate 5 can be horizontally arranged between the conveyor chain plate 15 and the base 4, and both sides are respectively connected to the cross beam 4b through two sets of connecting rod groups 6.

[0041] The connecting rod group 6 is composed of two connecting rods 7. The two connecting rods 7 are arranged in parallel, and the two ends of each connecting rod 7 are respectively hinged or connected by bearings to the cross beam 4b and the floating plate 5. The connection points of the two connecting rods 7 in the same group with the cross beam 4b and the floating plate 5 can enclose a parallelogram, so that a stable parallelogram structure is formed between the cross beam 4b, the floating plate 5 and the connecting rod 7, so that the entire floating plate 5 can always move up and down parallelly with the change of the tobacco leaf height, so that the moisture detector always maintains the detection direction perpendicular to the conveyor chain plate 15, so as to reduce the interference of the reflected signal of the conveyor chain plate 15 and further improve the detection accuracy.

[0042] In this embodiment, optionally, the front end of the floating plate 5 is tilted upward to form an inclined surface. Specifically, the front end of the floating plate 5 refers to the end facing the incoming material direction of the conveyor chain plate 15. The front end of the floating plate 5 being tilted into an inclined surface can make it easier for the tobacco leaf material to pass through without clogging. To protect the moisture detector 2, protective wing plates can also be provided on both sides of the floating plate 5 to protect the moisture detector 2, and the connecting rod 7 can be hinged to the protective wing plates.

[0043] Moreover, due to the high temperature, high humidity, and large dust content inside the tobacco curing machine, the floating plate 5, the connecting rod 7, etc. can all be made of stainless steel. The connecting rod 7 can also be connected to the base 4 and the protective wing plates through heat-resistant and dust-proof bearings.

[0044] In this embodiment, optionally, the balance mechanism 3 includes:

[0045] A pulley 8, arranged above the moisture detector 2;

[0046] A connecting rope 9, one end of which is connected to a counterweight 10 with a weight equal to the combined weight of the moisture detector 2 and the floating bracket 1, and the other end passes through the pulley 8 and is vertically downwardly connected to the moisture detector 2.

[0047] Specifically, the balance mechanism 3 is composed of a pulley 8, a connecting rope 9, and a counterweight 10. The pulley 8 is a fixed pulley and can be installed above the moisture detector 2. One end of the connecting rope 9 can pass through the chute of the pulley 8 and then extend vertically downward to the moisture detector 2 and be fixedly connected to the moisture detector 2, and the other end can be connected to the counterweight 10. The weight of the counterweight 10 is equal to the combined weight of the floating bracket 1 and the moisture detector 2. In this way, the counterweight 10 can lift the moisture detector 2 and the floating bracket 1, enabling the floating bracket 1 to automatically float up and down with the stacking height of the tobacco leaves on the conveyor chain plate 15.

[0048] In this embodiment, optionally, a height limiting mechanism is further included. This height limiting mechanism is connected to the floating bracket 1 and is used to limit the floating height of the floating bracket 1. Specifically, the inclined surface of the floating plate 5 can extend obliquely upward to the base 4a near the lower side of the cross beam 4b. The height limiting mechanism can be a stop piece 11, and this stop piece 11 can be horizontally arranged at the end face of the inclined surface. When the floating plate 5 moves upward a certain distance, the stop piece 11 will abut against the cross beam 4b, and the cross beam 4b can block the entire floating plate 5 from continuing to float upward, preventing the floating plate 5 from floating upward too far and preventing the floating plate 5 from rubbing against the inner wall of the tobacco curing machine.

[0049] In this embodiment, optionally, a displacement detector 12 is further included, and the displacement detector 12 is used to detect the displacement data of the floating bracket 1 in the vertical direction. The displacement detector 12 can detect the moving distance of the floating bracket 1 in the vertical direction. Based on the initial height and the moving distance of the floating bracket 1, the real-time height change data of the floating bracket 1 can be determined. According to the height change data, the reflected signal of the conveyor chain plate 15 can be compensated and eliminated, further improving the detection accuracy of the tobacco leaf moisture.

[0050] In this embodiment, the displacement detector 12 is composed of a sleeve 13, a floating rod 14 and a displacement sensor. The sleeve 13 is vertically fixed on the base 4a, the displacement sensor is arranged on the floating rod 14, the floating rod 14 is inserted into the sleeve 13 and its lower end passes through the cross beam 4b and abuts against the top surface of the baffle 11. In this way, the floating rod 14 is in sliding contact with the baffle 11. When the floating bracket 1 floats upward, the floating rod 14 can move upward synchronously with the floating bracket 1. The real-time moving distance of the floating rod 14 can be detected by the displacement sensor, which is the real-time moving distance of the floating bracket 1 in the vertical direction.

[0051] As Figure 3 shown, a tobacco leaf moisture detection device includes an on-line moisture detection device, which is arranged above the conveying path of the conveyor chain plate 15 and includes:

[0052] A floating bracket 1, which is arranged above the conveying path of the conveyor chain plate 15;

[0053] A moisture detector 2, which is fixedly arranged on the floating bracket 1 and the detection direction is perpendicular to the conveyor chain plate 15;

[0054] A balancing mechanism 3, which is connected to the moisture detector 2 and is used to balance the weights of the floating plate 5 and the moisture detector 2.

[0055] Specifically, as Figures 1-3 shown, the tobacco curing machine is composed of a tobacco curing device 16, a conveyor chain plate 15 and a detection device. The conveyor chain plate 15 passes through the tobacco curing device 16 to send the tobacco leaves into the interior of the tobacco curing device 16. The detection device is composed of a floating bracket 1, a moisture detector 2 and a balancing mechanism 3. Among them, the moisture detector 2 is installed on the floating bracket 1, and the floating bracket 1 is installed inside the tobacco curing device 16 and is located directly above the conveyor chain plate 15. Its installation height can be set according to the lowest stacking height on the conveyor chain plate 15, so that the moisture detector 2 can be in direct contact with the tobacco leaves to detect the moisture content of the tobacco leaves passing through the moisture detector 2.

[0056] Moreover, the balance mechanism 3 can balance the weights of the moisture detector 2 and the floating bracket 1, enabling the floating bracket 1 to automatically float up and down with the stacking height of the tobacco leaves on the conveyor chain plate 15, reducing the extrusion force of the floating bracket 1 on the tobacco leaves, keeping the tobacco leaves on the conveyor chain plate 15 in a natural fluffy state, avoiding inaccurate measurement caused by the extrusion of the tobacco leaves, achieving the purpose of eliminating the influence of inconsistent stacking heights of the tobacco leaves on the detection accuracy, and improving the moisture detection accuracy of the tobacco leaves.

[0057] In this embodiment, optionally, the floating bracket 1 includes:

[0058] A base 4, fixedly arranged above the conveying path of the conveyor chain plate 15;

[0059] A floating plate 5, arranged below the base 4 and provided with mounting holes. The moisture detector 2 is embedded in the mounting holes and fixedly connected to the floating plate 5;

[0060] Two groups of connecting rod groups 6, respectively arranged oppositely on both sides of the floating plate 5, and each group includes two connecting rods 7. The two ends of the connecting rod 7 are respectively hinged or connected by bearings to the base 4 and the floating plate 5, and the connection points of the two connecting rods 7 with the floating plate 5 and the base 4 are distributed in a parallelogram.

[0061] Specifically, in this embodiment, the moisture detector 2 can adopt a microwave moisture detector 2, which can determine the moisture content of the tobacco leaves by reflecting signals from the tobacco leaves. However, while the moisture detector 2 receives the reflected signals from the tobacco leaves, it will also be interfered by the reflected signals from the conveyor chain plate 15 below.

[0062] For this reason, the floating bracket 1 can be composed of a base 4, a floating plate 5, and two groups of connecting rod groups 6. Among them, the base 4 includes a vertically arranged base 4a and a horizontally arranged cross beam 4b. The base 4a can be fixedly installed directly above the conveyor chain plate 15 inside the tobacco curing machine, and the cross beam 4b can be horizontally fixed on the base 4a along the feeding direction of the conveyor chain plate 15. The floating plate 5 can be horizontally arranged between the conveyor chain plate 15 and the base 4, and both sides are respectively connected to the cross beam 4b through two groups of connecting rod groups 6.

[0063] The connecting rod group 6 is composed of two connecting rods 7. The two connecting rods 7 are arranged in parallel, and the two ends of each connecting rod 7 are respectively hinged or connected by bearings to the cross beam 4b and the floating plate 5. The connection points of the two connecting rods 7 in the same group with the cross beam 4b and the floating plate 5 can enclose a parallelogram, enabling a stable parallelogram structure to be formed among the cross beam 4b, the floating plate 5, and the connecting rod 7, so that the entire floating plate 5 can always move up and down parallelly with the change of the tobacco leaf height, ensuring that the moisture detector always maintains a detection direction perpendicular to the conveyor chain plate 15, reducing the interference of the reflected signals from the conveyor chain plate 15, and further improving the detection accuracy.

[0064] In this embodiment, optionally, one end of the floating plate 5 is tilted upward to form an inclined surface, and this inclined surface faces the incoming material direction of the conveyor chain plate 15. Specifically, the front end of the floating plate 5 refers to the end facing the incoming material direction of the conveyor chain plate 15. The front end of the floating plate 5 being tilted into an inclined surface can make the tobacco leaf material pass through more easily without jamming. In order to protect the moisture detector 2, protective wing plates can also be provided on both sides of the floating plate 5 to protect the moisture detector 2, and the connecting rod 7 can be hinged to the protective wing plates.

[0065] In this embodiment, optionally, the balance mechanism 3 includes:

[0066] A pulley 8, arranged above the moisture detector 2;

[0067] A connecting rope 9, one end of which is connected to a counterweight 10 with a weight equal to the combined weight of the floating plate 5 and the moisture detector 2, and the other end passes through the pulley 8 and is vertically downwardly connected to the moisture detector 2.

[0068] Specifically, the balance mechanism 3 is composed of a pulley 8, a connecting rope 9, and a counterweight 10. The pulley 8 can be installed above the moisture detector 2. One end of the connecting rope 9 can pass through the chute of the pulley 8 and then vertically downward extend to the moisture detector 2 and be fixedly connected to the moisture detector 2, and the other end can be connected to the counterweight 10. The weight of the counterweight 10 is equal to the combined weight of the floating bracket 1 and the moisture detector 2. In this way, the counterweight 10 can pull up the moisture detector 2 and the floating bracket 1, enabling the floating bracket 1 to automatically float up and down with the stacking height of the tobacco leaves on the conveyor chain plate 15.

[0069] In this embodiment, optionally, a height limiting mechanism is further included, and this height limiting mechanism is connected to the floating bracket 1 and is used to limit the floating height of the floating bracket 1. Specifically, the inclined surface of the floating plate 5 can be inclined upward and extend to the base 4a near the lower part of the cross beam 4b. The height limiting mechanism can be a stop piece 11, and this stop piece 11 can be horizontally arranged at the end face of the inclined surface. When the floating plate 5 moves upward a certain distance, the stop piece 11 will abut against the cross beam 4b, and the cross beam 4b can block the entire floating plate 5 from continuing to float upward.

[0070] In this embodiment, optionally, a displacement detector 12 is further included, and this displacement detector 12 is used to detect the displacement data of the floating bracket 1 in the vertical direction. The displacement detector 12 can detect the moving distance of the floating bracket 1 in the vertical direction. According to the initial height and the moving distance of the floating bracket 1, the real-time height change data of the floating bracket 1 can be determined. Based on the height change data, the reflected signal of the conveyor chain plate 15 can be compensated and eliminated, further improving the detection accuracy of the tobacco leaf moisture.

[0071] It should be understood that the on-line moisture detection device in this embodiment can not only be used for moisture detection of tobacco leaves, but also for feeding using a conveyor belt and in the production fields where moisture detection of materials is required.

[0072] For example, the on-line moisture detection device can be used for moisture detection of PVC resin raw materials. The on-line moisture detection device can be fixedly arranged directly above the feeding conveyor belt of PVC resin raw materials through a bracket to detect the moisture content of the PVC resin raw materials stacked on the feeding conveyor belt. It should be understood that the PVC resin raw materials can be PVC resin powder, PVC resin particles, etc.

[0073] For another example, the on-line moisture detection device can also be used for moisture detection of metallurgical raw materials. The on-line moisture detection device can be fixedly arranged directly above the feeding conveyor belt of metallurgical raw materials through a bracket, and then the moisture content of the metallurgical materials stacked on the feeding conveyor belt can be detected. It should be understood that the metallurgical raw materials can be metallurgical powder.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the specification of the present invention.

Claims

1. An on-line moisture detection device, characterized in that, Comprising: Floating bracket; Moisture detector, arranged on the floating bracket with the detection direction vertically downward; Balancing mechanism, connected to the moisture detector, and the balancing mechanism is used to balance the weights of the moisture detector and the floating bracket; It further includes a displacement detector, which is used to detect the displacement data of the floating bracket in the vertical direction, determine the real-time height change data of the floating bracket according to the initial height and displacement data of the floating bracket, and perform compensation elimination processing on the reflection signal of the conveyor chain plate according to the height change data; The floating bracket includes: Base, including a vertically arranged base and a horizontally arranged cross beam; Floating plate, arranged below the base and provided with an installation hole, the moisture detector is embedded in the installation hole and fixedly connected to the floating plate; Two groups of connecting rod groups, respectively arranged oppositely on both sides of the floating plate, and each group includes two connecting rods. The two ends of each connecting rod are respectively hinged or connected by bearings to the base and the floating plate, and the connection points of the two connecting rods in the same group with the cross beam and the floating plate can form a parallelogram, so that a stable parallelogram structure is formed among the cross beam, the floating plate and the connecting rods, so that the moisture detector always maintains a detection direction perpendicular to the conveyor chain plate.

2. The online moisture detection device according to claim 1, characterized in that The front end of the floating plate is upturned to form an inclined surface.

3. The online moisture detection device according to claim 1, wherein, The balancing mechanism includes: Pulley, arranged above the moisture detector; Connecting rope, one end of which is connected with a counterweight whose weight is equal to the combined weight of the moisture detector and the floating bracket, and the other end passes through the pulley and is vertically downward connected to the moisture detector.

4. The online moisture detection device according to claim 1, characterized in that, It further includes a height limiting mechanism, which is connected to the floating bracket and is used to limit the floating height of the floating bracket.

5. A tobacco leaf moisture detection device, characterized in that, It further includes the on-line moisture detection device according to any one of claims 1-4, and the on-line moisture detection device is arranged above the conveying path of the tobacco leaf raw material.

6. Use of an on-line moisture detection device as described in any one of claims 1-4 in PVC resin, characterized in that, The on-line moisture detection device is arranged on the feeding path of the PVC raw material.

7. Use of an on-line moisture detection device as described in any one of claims 1-4 in metallurgy, characterized in that, The on-line moisture detection device is arranged on the feeding path of the metallurgical raw material.

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