A device and method for detecting the coarse slurry rate of a papermaking process reconstituted tobacco slurry

Abstract

The application discloses a papermaking method reconstituted tobacco slurry coarse slurry rate detection device and method, including defibration tank, screening chamber, first centrifugal drying weighing equipment, second centrifugal drying weighing equipment and PLC control system, the discharge port of defibration tank and the feed port of screening chamber are connected, the stirring zone and screening zone are arranged in the screening chamber, the stirring zone and screening zone are separated by the partition, the stirrer is arranged in the stirring zone, the bottom of the stirring zone is provided with the pulp outlet, the upper portion of the side wall of the screening zone is provided with the overflow port, the overflow port is connected with the inlet of the first centrifugal drying weighing equipment through the pipeline, and the pulp outlet is connected with the inlet of the second centrifugal drying weighing equipment through the pipeline; the application realizes automatic and accurate detection of the papermaking method reconstituted tobacco slurry coarse slurry rate full process, shortens the detection time, directly reads the detection result after detection of a single sample is finished, is convenient to operate, greatly reduces the labor intensity of detection personnel, and can be used for rapid monitoring of slurry performance in the papermaking method reconstituted tobacco production process.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of reconstituted tobacco production, and particularly relates to a device and method for detecting the coarse pulp rate of papermaking reconstituted tobacco pulp. TECHNICAL BACKGROUND

[0002] The pulping technology is a process of realizing a series of changes in longitudinal and transverse forms such as defibration, cutting, and filament splitting of insoluble substances under the action of mechanical force by means of a pulping device, and finally forming pulp that can be used for paper machine papermaking. Due to the characteristics of tobacco raw materials, the pulping process of papermaking reconstituted tobacco is mainly defibration, cutting, and crushing, and the degree of "coarse" and "fine" of the pulp is usually controlled by controlling the work of the pulping device. When the coarse pulp rate of the papermaking reconstituted tobacco pulp is relatively high, the product thickness, bulkiness, and filling value are relatively high, and the absorbency is good.

[0003] In actual production and research of papermaking reconstituted tobacco, the traditional papermaking industry wet weight index is often used to determine the degree of "coarse" and "fine" of the pulp. However, there are great differences between the components and fiber forms of tobacco raw materials and traditional wood pulp. When the wet weight is measured, the crushed tobacco is not easy to hang on the metal frame, and the tobacco stem fibers are short, hard, and irregular in shape. Compared with soft and plastic wood pulp fibers, they are easy to flow out of the metal frame with water, resulting in low accuracy of the detection results. Compared with the traditional papermaking industry wet weight index, the square hole screen design of the Bauer screen instrument is more suitable for the detection and performance determination of the papermaking reconstituted tobacco pulp with coexistence of sheet-shaped, block-shaped, and fibrous components. However, the screening grade of the device is 5, which is not suitable for single-stage detection of the coarse pulp rate of the papermaking reconstituted tobacco pulp. In addition, the pulp after each screen needs to be collected after being dehydrated by vacuum suction. The vacuum suction force cannot be too large, otherwise the filter paper on the suction disc will be sucked and broken, resulting in a vacuum suction time of about 40 minutes. The collected pulp after each screen needs to be transferred to a weighing box and dried to a constant weight, and finally weighed and calculated. The whole process is complicated, the detection time of a single sample is at least about 6 hours, and the detection personnel need to operate manually, which is not suitable for rapid detection and evaluation of the performance of the papermaking reconstituted tobacco pulp. SUMMARY

[0004] The application discloses a device and method for detecting the coarse pulp rate of papermaking reconstituted tobacco pulp, realizes automatic and accurate detection of the coarse pulp rate of papermaking reconstituted tobacco pulp in the whole process, shortens the detection time, greatly reduces the labor intensity of the detection personnel, and can be used for rapid monitoring of the performance of the pulp in the production process of papermaking reconstituted tobacco.

[0005] To achieve the above object, the application adopts the following technical solutions:

[0006] The application discloses a device for detecting the coarse pulp rate of a papermaking-process reconstituted tobacco pulp, which comprises a defibration tank, a screening chamber, a first centrifugal drying and weighing device, a second centrifugal drying and weighing device and a control cabinet, the defibration tank and the screening chamber are each provided with a feeding inlet and a water inlet, the water inlets of the defibration tank and the screening chamber are respectively provided with first and second water inlets, automatic adjusting valves and electromagnetic flowmeters are respectively arranged on the first and second water inlets, a first stirrer is arranged in the defibration tank, a discharge outlet of the defibration tank is connected with the feeding inlet of the screening chamber through a pipeline and a first discharge valve arranged on the pipeline, a stirring area and a screening area are arranged in the screening chamber, the stirring area and the screening area are separated by a partition plate, a second stirrer is arranged in the stirring area, a pulp outlet is arranged at the bottom of the stirring area, a screen plate and a screen plate groove are arranged in the screening area, the screen plate is fixed in the screen plate groove, the four corners of the partition plate are fixed on the screen plate groove through studs, an overflow outlet is arranged at the upper part of the side wall of the screening area, the overflow outlet is connected with the inlet of the first centrifugal drying and weighing device through a pipeline, the pulp outlet is connected with the inlet of the second centrifugal drying and weighing device through a pipeline and a second discharge valve arranged on the pipeline, and the automatic adjusting valves, the electromagnetic flowmeters, the first and second discharge valves and the control cabinet are connected with a PLC control system.

[0007] Further, the first centrifugal drying and weighing device and the second centrifugal drying and weighing device have the same structure and are sequentially provided with a screen chamber, a centrifugal dewatering chamber and an outer shell from inside to outside, the screen chamber has a top-open structure formed by a screen, the screen of the screen chamber is connected with the centrifugal dewatering chamber through buckles, a heat preservation layer is arranged on the inner wall of the outer shell, a heating and drying mechanism is arranged between the heat preservation layer and the centrifugal dewatering chamber, a liquid discharge outlet is arranged at the bottom of the outer shell, and the four supporting legs of the outer shell are respectively provided with weighing modules.

[0008] Further, the heating and drying mechanism is a heating wire, an infrared instrument or a microwave dryer, and the screen is made of stainless steel and has a mesh number of 200-300.

[0009] Further, the centrifugal dewatering chamber comprises a cylindrical dewatering barrel, the dewatering barrel is provided with filter holes, a rotating disc at the bottom of the dewatering barrel is connected with a motor shaft, the motor shaft is connected with a motor, a protective shell is arranged outside the motor shaft, and the liquid discharge outlet is arranged at the bottom of the outer shell between the protective shell and the heat preservation layer.

[0010] Further, the feeding inlet of the defibration tank is in a funnel shape, and a concentration meter and a liquid level meter are arranged in the defibration tank.

[0011] Further, a spraying mechanism is arranged at the top of the stirring area of the screening chamber, the spraying mechanism is connected with a third water inlet pipeline, a water inlet valve is arranged on the third water inlet pipeline, and the water inlet valve is connected with the PLC control system.

[0012] Further, the control cabinet is provided with a liquid crystal display screen, switch buttons, an emergency stop button and parameter setting buttons.

[0013] Further, the valve opening degree of the automatic regulating valve on the first and second water inlet pipes adopts single loop control with the flow size of the electromagnetic flowmeter as the input signal.

[0014] Further, the screen plate is one of 10 mesh, 12 mesh, 14 mesh, 16 mesh and 20 mesh standard screens.

[0015] The method for detecting the coarse pulp rate of the papermaking reconstituted tobacco slurry by using the detection device is as follows:

[0016] (1) Before the papermaking reconstituted tobacco slurry to be detected enters the defibration tank, water is added to the defibration tank until the target liquid level is reached, the automatic regulating valve on the first water inlet pipe is closed, water addition is stopped, the papermaking reconstituted tobacco slurry to be detected is added into the defibration tank through the feeding port, the first agitator is started, and after the stirring time is reached, the first discharge valve is opened, and the slurry suspension in the defibration tank enters the screening chamber;

[0017] (2) After the slurry suspension enters the screening chamber, the second agitator of the screening chamber is started, the screening timing is started, after the slurry suspension enters the screening chamber completely, the first agitator stops running, the automatic regulating valve on the second water inlet pipe is opened, the second electromagnetic flowmeter supplies water to the screening chamber at the set flow, and the first centrifugal drying and weighing device is cleared to zero in weight; during the screening process, the slurry passing through the screen plate flows into the screen chamber of the first centrifugal drying and weighing device through the overflow port on the right side wall of the screening chamber, and then the screen chamber and the centrifugal dewatering chamber are operated at a low speed of 1000 r / min to prevent the slurry from overflowing;

[0018] (3) After the screening timing is completed, the automatic regulating valve on the second water inlet pipe is closed, the second agitator stops running, the second centrifugal drying and weighing device is cleared to zero in weight, the second discharge valve is opened, the slurry in the screening chamber enters the screen chamber of the second centrifugal drying and weighing device, 15 seconds later, the spraying mechanism of the screening chamber is opened to flush the residual slurry in the screening chamber, after the flushing is completed, the first and second centrifugal drying and weighing devices are operated at a high speed of 4500 r / min to start the centrifugal timing, after the centrifugal timing is completed, the heating and drying mechanism is started, the real-time weight is continuously detected during the drying process, after the weight of the first and second centrifugal drying and weighing devices is constant, the sensor of the weighing module transmits the weight after the constant weight to the control system, the coarse pulp rate of the measured slurry sample is calculated, and the calculation result of the coarse pulp rate is displayed on the liquid crystal display screen of the control cabinet.

[0019] Further, the calculation formula of the target liquid level is as follows:

[0020]

[0021] In the formula, L is the target liquid level of the defibration tank, %.

[0022] L 目标 — the target liquid level of the defibration tank, %

[0023] M 绝干 --- the absolute dry weight of the sample to be tested, g

[0024] M 风干 --- the air-dry weight of the sample to be tested, g

[0025] C 目标 --- the target concentration of the sample to be tested after defibration and concentration, wt%

[0026] ρ 水 --- the density of water, g / cm 3

[0027] V 疏解罐 --- the volume of the defibration tank after calibration, L

[0028] Further, the calculation formula of the coarse pulp rate is as follows:

[0029]

[0030] In the formula:

[0031] coarse pulp rate - the coarse pulp rate of the sample to be tested

[0032] m 第一 --- the weight of the first centrifugal drying and weighing device after drying and constant weight, g

[0033] m 第二 --- the weight of the second centrifugal drying and weighing device after drying and constant weight, g

[0034] The present application realizes automatic and accurate detection of the coarse pulp rate of the pulp of the paper-making method reconstituted tobacco throughout the whole process, shortens the detection time, directly reads the detection result after the detection of a single sample is completed, is convenient to operate, greatly reduces the labor intensity of the detection personnel, and can be used for rapid monitoring of the pulp performance in the production process of the paper-making method reconstituted tobacco. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural schematic diagram of the present application;

[0036] Figure 2 is a top view of the screening chamber in A-A direction;

[0037] Figure 3 is a structural schematic diagram of the control cabinet;

[0038] In the diagram: 1. Feed inlet of the sludge tank; 2. Sludge tank; 21. First agitator; 22. Concentration meter; 23. Level gauge; 31. First automatic regulating valve; 32. Second automatic regulating valve; 41. First electromagnetic flow meter; 42. Second electromagnetic flow meter; 5. First discharge valve; 6. Water inlet valve; 7. Screening chamber; 71. Second agitator; 72. Spraying mechanism; 73. Baffle plate; 74. Screen plate; 75. Pneumatic clamping mechanism; 76. Overflow port; 7 7. Slurry outlet; 78. Screen plate groove; 8. First centrifugal drying and weighing device; 81. Screen chamber; 811. Screen; 82. Centrifugal dewatering chamber; 83. Outer shell; 84. Heating and drying mechanism; 85. Insulation layer; 86. Weighing module; 9. Second centrifugal drying and weighing device; 10. Second discharge valve; 11. Drain outlet; 12. Control cabinet; 121. LCD display screen; 122. Parameter setting button; 123. Switch button; 124. Emergency stop button. Detailed Implementation

[0039] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] Example 1

[0041] A device for detecting the rough pulp ratio of reconstituted tobacco pulp in papermaking, such as Figures 1 to 3 As shown, the system includes a shunting tank 2, a screening chamber 7, a first centrifugal drying and weighing device 8, a second centrifugal drying and weighing device 9, and a control cabinet 12. Both the shunting tank 1 and the screening chamber 2 are equipped with a feed inlet and a water inlet. The water inlets of the shunting tank 2 and the screening chamber 7 are respectively equipped with a first water inlet pipe and a second water inlet pipe. The first water inlet pipe is equipped with a first automatic regulating valve 31 and a first electromagnetic flowmeter 41, and the second water inlet pipe is equipped with a second automatic regulating valve 32 and a second electromagnetic flowmeter 42. The shunting tank 2 is equipped with a first agitator 21, a concentration meter 22, and a level gauge 23. The discharge port of the shunting tank 2 is connected to the feed inlet of the screening chamber 7 through a pipe and a first discharge valve 5 installed on the pipe. The screening chamber 7 is equipped with a stirring zone and a screening zone, which are separated by a partition 73. The mixing zone is equipped with a second agitator 71, and the bottom of the mixing zone is equipped with a slurry outlet 77. The screening zone is equipped with a screen plate 74 and a screen plate groove 78. The screen plate 74 is fixed in the screen plate groove 78 by a pneumatic clamping mechanism 75. The four corners of the partition plate 73 are fixed to the screen plate groove 78 by studs. The upper part of the side wall of the screening zone is equipped with an overflow outlet 76. The overflow outlet 76 is connected to the inlet of the first centrifugal drying and weighing device 8 through a pipe. The slurry outlet 77 is connected to the second discharge valve 10 and the inlet of the second centrifugal drying and weighing device 9 through a pipe. The first automatic regulating valve 31, the first electromagnetic flowmeter 41, the second automatic regulating valve 32, the second electromagnetic flowmeter 42, the first discharge valve 5, the second discharge valve 10 and the control cabinet 12 are all connected to the PLC control system.

[0042] The first centrifugal drying and weighing device 8 and the second centrifugal drying and weighing device 9 have the same structure, and are sequentially provided from inside to outside with a screen chamber 81, a centrifugal dewatering chamber 82 and an outer shell 83. The screen chamber 81 has a top opening structure formed by a screen 811. The screen 811 of the screen chamber 81 is connected to the centrifugal dewatering chamber 82 by buckling. The inner wall of the outer shell is provided with a heat preservation layer 85. The heat preservation layer 85 and the centrifugal dewatering chamber 82 are provided with a heating and drying mechanism 84. The bottom of the outer shell 83 is provided with a liquid discharge port. The four supporting legs of the outer shell 83 are respectively provided with a weighing module 86. The heating and drying mechanism 84 is a heating wire, an infrared instrument or a microwave dryer. The screen 811 is made of stainless steel and has a mesh number of 200.

[0043] The centrifugal dewatering chamber 82 comprises a cylindrical dewatering barrel. The dewatering barrel is provided with filter holes. A rotating disc at the bottom of the dewatering barrel is connected to a motor shaft. The motor shaft is connected to a motor. The motor shaft is provided with a protective shell. The liquid discharge port is located at the bottom of the outer shell between the protective shell and the heat preservation layer 85.

[0044] The feed inlet 1 of the defibration tank 2 is in the shape of a funnel.

[0045] The top of the stirring area of the screening chamber 7 is provided with a spraying mechanism 72. The spraying mechanism 72 is connected to a third water inlet pipeline. The third water inlet pipeline is provided with a water inlet valve 6. The water inlet valve 6 is connected to a PLC control system.

[0046] The control cabinet 12 is provided with a liquid crystal display screen 121, parameter setting buttons 122, on-off buttons 123 and an emergency stop button 124.

[0047] The valve opening degree of the first automatic regulating valve 31 adopts single loop control with the flow size of the first electromagnetic flowmeter 41 as an input signal. The valve opening degree of the second automatic regulating valve 32 adopts single loop control with the flow size of the second electromagnetic flowmeter 42 as an input signal.

[0048] The defibration tank 2 is a closed stainless steel tank body with a volume of 3-3.5L. The upper end cover of the tank body is sequentially provided from left to right with a funnel-shaped feed inlet 1, a first vertical stirrer 21 and a water inlet. The side of the tank body is provided with a liquid level meter 23 and a concentration meter 22. The bottom of the tank body is provided with a first discharge valve 5. If the equipment investment cost is saved, the concentration meter can not be installed, but the pulp concentration (0.5wt%-1.0wt%) in the tank body can be controlled by controlling the liquid level of the tank body. Before the pulp to be measured enters the defibration tank, the defibration tank is watered to the target liquid level (see Formula One for the calculation of the target liquid level). When the liquid level in the tank body reaches the target liquid level (see Formula One for the calculation of the target liquid level), the first automatic regulating valve 31 is closed, and watering is stopped. The pulp to be measured is added into the defibration tank through the funnel-shaped feed inlet 1. The first vertical stirrer 21 is started. After the stirring time is reached, the first discharge valve 5 is opened. The pulp suspension in the defibration tank 2 enters the screening chamber 7.

[0049] The second agitator 71 in the screening chamber 7 is started, the screening timing is started, and after the pulp suspension is completely introduced into the screening chamber 7, the first agitator 21 stops running, the second automatic regulating valve 32 is opened, and the second electromagnetic flowmeter 42 supplies water to the screening chamber 7 at a set flow rate. The right side of the second agitator 71 is sequentially provided with a spraying mechanism 72 and a baffle 73. The spraying mechanism 72 is used for rapid flushing of the screening chamber 7 when collecting the pulp after screening. The baffle 73 is used to prevent the fibrous, sheet-shaped, block-shaped and other component materials of the pulp from passing through the screen plate 74 under the centrifugal force of the second agitator 71 during the screening process, so as to affect the accuracy of the detection result. A screen plate 74 with a certain mesh number is arranged on the right side of the baffle 73. The screen plate 74 is installed in a screen plate groove 78 and is fixed by a pneumatic jacking mechanism 75 (existing equipment, including jacking bolts, rubber pipes and inflation devices. When the screen plate 74 is installed in the screen plate groove 78, the jacking bolts are used to jacking the screen plate 74. The rubber pipes are located in the screen plate groove, and the rubber pipes are inflated to jacking the screen plate. The screen plate 74 is designed in a detachable manner, which is convenient for cleaning or replacement. An overflow port 76 is arranged on the side wall of the screening chamber on the right side of the screen plate 74. A second discharge valve 10 is arranged at the bottom of the screening chamber 7.

[0050] The baffle 73 is fixed by four solid bars with a length of 30 mm arranged symmetrically up and down and left and right. The solid bars are welded on the side of the vertical section of the screen plate groove 78 close to the second agitator 71. The upper surface of the baffle 73 is 15-20 mm higher than the highest point of the stirring paddle of the second agitator 71. The lower surface of the baffle 73 is 10 mm away from the bottom plate of the screening chamber 7. The baffle 73 is 30 mm away from the inner wall of the screening chamber 7 at the front and rear ends in the horizontal direction.

[0051] The mesh number of the screen plate 73 can be selected from one of 10 mesh, 12 mesh, 14 mesh, 16 mesh and 20 mesh standard screens according to the thickness of the pulp of the papermaking reconstituted tobacco.

[0052] The first centrifugal drying and weighing device 8 and the second centrifugal drying and weighing device 9 are the same in structure, and the first centrifugal drying and weighing device 8 is taken as an example. From inside to outside, the first centrifugal drying and weighing device 8 is sequentially provided with a screen chamber 81, a centrifugal dehydration chamber 82 and an outer shell 83. The screen chamber 81 is detachable, the screen 811 is made of stainless steel and has a mesh number of 200 meshes. The screen chamber 81 and the centrifugal dehydration chamber 82 are connected through buckles. The inner wall of the outer shell 83 is provided with a heat preservation layer 85. The outer shell 83 and the centrifugal dehydration chamber 82 are provided with a heating and drying mechanism. The bottom of the outer shell 83 is provided with a liquid discharge port. The four supporting legs of the outer shell 83 are respectively provided with a weighing module 86. When the screening timing starts, the first centrifugal drying and weighing device 8 is cleared to zero. During the screening process, the slurry passing through the screen plate 74 flows into the screen chamber 81 of the first centrifugal drying and weighing device 8 through the overflow port 76 on the right side wall of the screening chamber 7. Then the screen chamber 81 and the centrifugal dehydration chamber 82 rotate at a low speed of 1000 r / min to prevent the slurry from overflowing. After the screening timing is completed, the second automatic adjusting valve 32 is closed, the second stirrer 71 stops running, the second centrifugal drying and weighing device 9 is cleared to zero, and the second discharge valve 10 is opened. The slurry in the screening chamber 7 enters the screen chamber of the second centrifugal drying and weighing device 9. After 15 seconds, the spraying mechanism 72 of the screening chamber 7 is opened to flush the residual slurry in the screening chamber 7. After the flushing is completed, the first and second centrifugal drying and weighing devices start to rotate at a high speed of 4500 r / min to start the centrifugal timing. After the centrifugal timing is completed, the heating and drying mechanism 84 is started. During the drying process, the real-time weight is continuously detected. When the weight of the first and second centrifugal drying and weighing devices is constant, the sensor of the weighing module transmits the constant weight to the control system. The coarse pulp rate of the measured slurry sample is calculated (see formula two for coarse pulp rate calculation). The coarse pulp rate calculation result is displayed on the liquid crystal display screen 121 of the control cabinet 12. The control cabinet 12 is also provided with a switch button 123, an emergency stop button 124 and a parameter setting button 122. The parameter setting button 122 can input the absolute dry weight, the air-dried weight, the target concentration and the defibration time, the screening time, the centrifugal time and other parameters of the sample to be measured according to the actual demand. The specific values during parameter setting are displayed on the liquid crystal display screen 121 of the control cabinet.

[0053] When the coarse pulp rate of the papermaking process reconstituted tobacco slurry is detected, the defibration dispersion, dilution concentration, screening, post-screening collection, centrifugal drying and weighing calculation are automatically performed. After the detection of a single sample is completed, the detection result is directly read, and the operation is convenient.

[0054] Formula one:

[0055]

[0056] In the formula:

[0057] L 目标 Target liquid level of the defibration tank, %

[0058] M 绝干Absolute dry weight of the sample to be tested, g

[0059] M 风干 Air-dry weight of the sample to be tested, g

[0060] C 目标 Target concentration of the sample to be tested after defibration and concentration, wt%

[0061] p 水 Density of water, g / cm 3

[0062] V 疏解罐 Volume of the defibration tank after calibration, L

[0063] Formula two:

[0064]

[0065] In the formula:

[0066] Rough pulp rate - rough pulp rate of the sample to be tested

[0067] m 第一 Weight of the first centrifugal drying and weighing device after drying to a constant weight, g

[0068] m 第二 Weight of the second centrifugal drying and weighing device after drying to a constant weight, g

[0069] Application example 1:

[0070] Six groups of beaten pulp samples under different beating powers of papermaking process reconstituted tobacco were selected, the rough pulp rate of the beaten pulp sample was determined by using the rough pulp rate detection device of the papermaking process reconstituted tobacco pulp, the screen mesh number was 12 meshes, and the wet weight was detected as a comparison, and the results are shown in Table 1.

[0071] Table 1 Comparison of rough pulp rate and wet weight of papermaking process reconstituted tobacco beaten pulp under different beating powers

[0072] Number Mill power (kW) Pulp consistency (%) Wet weight (g) 1# 130 12.72 2.71 2# 125 14.45 3.10 3# 120 17.10 3.36 4# 115 22.52 3.32 5# 110 28.31 3.67 6# 105 32.14 3.92

[0073] From Table 1, under different beating powers, the rough pulp rate index of the papermaking process reconstituted tobacco pulp has obvious differences, at the same time, compared with the wet weight index, the rough pulp rate index has obviously increased the base, which solves the problem that the wet weight test value base is too small and the difference is not obvious enough, and can be used as an evaluation index of pulp performance in the pulping process.

[0074] Application example 2:

[0075] The papermaking process reconstituted tobacco leaf beaten pulp is selected, the coarse pulp rate of the same pulp sample is determined by using the papermaking process reconstituted tobacco leaf pulp coarse pulp rate detection device, the screen mesh number is 10 mesh, 12 mesh, 14 mesh, 16 mesh and 20 mesh, and the wet weight of the pulp sample is detected as a comparison, and the results are shown in Table 2.

[0076] Table 2 Comparison of coarse pulp rate and wet weight of papermaking process reconstituted tobacco leaf beaten pulp under different screen mesh numbers

[0077]

[0078]

[0079] As shown in Table 2, under different screen mesh numbers, the coarse pulp rate index of the papermaking process reconstituted tobacco leaf pulp is obviously larger than the wet weight index base, and can be used as an evaluation index of the pulp performance in the pulping process.

[0080] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the embodiments of the present application, but not to limit them, and the ordinary skilled in the art should understand that any equivalent replacement or obvious modification of the embodiments of the present application without changing the performance or purpose, which does not deviate from the purpose of the present application, should be covered within the scope of the present application.

Claims

1. A papermaking process reconstituted tobacco slurry consistency detection device, characterized by, The application relates to a papermaking process reconstituted tobacco pulp preparation device which comprises a defiberizing tank, a screening chamber, a first centrifugal drying and weighing device, a second centrifugal drying and weighing device and a control cabinet, the defiberizing tank and the screening chamber are each provided with a feeding port and a water inlet, the water inlets of the defiberizing tank and the screening chamber are respectively provided with first and second water inlets, automatic adjusting valves and electromagnetic flowmeters are arranged on the first and second water inlets, a first stirrer is arranged in the defiberizing tank, a discharge port of the defiberizing tank is connected with the feeding port of the screening chamber through a pipeline and a first discharge valve arranged on the pipeline, a stirring area and a screening area are arranged in the screening chamber, the stirring area and the screening area are separated by a partition plate, a second stirrer is arranged in the stirring area, a pulp outlet is arranged at the bottom of the stirring area, a screen plate and a screen plate groove are arranged in the screening area, the screen plate is fixed in the screen plate groove, four corners of the partition plate are fixed on the screen plate groove through studs, an overflow port is arranged at the upper portion of the side wall of the screening area, the overflow port is connected with the inlet of the first centrifugal drying and weighing device through a pipeline, the pulp outlet is connected with the inlet of the second centrifugal drying and weighing device through a pipeline and a second discharge valve arranged on the pipeline, the automatic adjusting valves, the electromagnetic flowmeters, the first and second discharge valves and the control cabinet are connected with a PLC control system; the first and second centrifugal drying and weighing devices have the same structure and are sequentially composed of a screen mesh chamber, a centrifugal dewatering chamber and an outer shell from inside to outside, the screen mesh chamber has a top opening structure formed by a screen mesh, the screen mesh of the screen mesh chamber is connected with the centrifugal dewatering chamber through buckles, a heat preservation layer is arranged on the inner wall of the outer shell, a heating and drying mechanism is arranged between the heat preservation layer and the centrifugal dewatering chamber, a liquid discharge port is arranged at the bottom of the outer shell, and weighing modules are arranged on the four supporting legs of the outer shell; a spraying mechanism is arranged at the top of the stirring area of the screening chamber, the spraying mechanism is connected with a third water inlet pipeline, a water inlet valve is arranged on the third water inlet pipeline, and the water inlet valve is connected with the PLC control system.

2. The apparatus for detecting the consistency of a papermaking process reconstituted tobacco slurry according to claim 1, wherein The heating and drying mechanism is a heating wire, an infrared instrument or a microwave dryer, and the screen mesh has a mesh number of 200-300.

3. The apparatus according to claim 1, wherein The centrifugal dewatering chamber comprises a cylindrical dewatering barrel, the dewatering barrel is provided with filtering holes, a rotating disc at the bottom of the dewatering barrel is connected with a motor shaft, the motor shaft is connected with a motor, a protective shell is arranged outside the motor shaft, and the liquid discharge port is arranged at the bottom of the outer shell between the protective shell and the heat preservation layer.

4. The apparatus according to claim 1, wherein The feeding port of the defiberizing tank is in the shape of a funnel, and a concentration meter and a liquid level meter are arranged in the defiberizing tank.

5. The apparatus according to claim 1, wherein the apparatus is characterized by: The control cabinet is provided with a liquid crystal display screen, switch buttons, an emergency stop button and parameter setting buttons.

6. The apparatus according to claim 1, wherein The valve opening degree of the automatic adjusting valves on the first and second water inlets adopts single-loop control taking the flow size of the electromagnetic flowmeter as an input signal.

7. The apparatus according to claim 1, wherein The screen plate is one of 10-mesh, 12-mesh, 14-mesh, 16-mesh and 20-mesh standard screen meshes.

8. A method for detecting the coarse pulp rate of a paper process reconstituted tobacco pulp using the detection device according to any one of claims 1 to 7, characterized in that, The process is as follows: (1) before the papermaking process reconstituted tobacco pulp to be measured enters the defiberizing tank, water is added to the defiberizing tank until the target liquid level is reached, the automatic adjusting valve on the first water inlet is closed, water feeding is stopped, the papermaking process reconstituted tobacco pulp to be measured is added into the defiberizing tank through the feeding port, the first stirrer is started, the first discharge valve is opened after a stirring time is reached, and the pulp suspension in the defiberizing tank enters the screening chamber; (2) After the slurry suspension enters the screening chamber, the second agitator in the screening chamber starts, and the screening timing begins. After the slurry suspension enters the screening chamber completely, the first agitator stops running, the automatic regulating valve on the second water inlet pipe opens, the second electromagnetic flowmeter supplies water to the screening chamber at a set flow rate, and the first centrifugal drying and weighing device is reset to zero. During the screening process, the slurry passing through the screen plate flows into the screen chamber of the first centrifugal drying and weighing device through the overflow port on the right side wall of the screening chamber. Then, the screen chamber and the centrifugal dewatering chamber operate at a low speed of 1000 r / min to prevent the slurry from overflowing. (3) After the screening timing is completed, the automatic regulating valve on the second water inlet pipe is closed, the second agitator stops running, the second centrifugal drying and weighing device is reset to zero, the second discharge valve opens, the slurry in the screening chamber enters the screen chamber of the second centrifugal drying and weighing device, and 15 seconds later, the spraying mechanism in the screening chamber opens to flush the residual slurry in the screening chamber. After the flushing is completed, the first and second centrifugal drying and weighing devices operate at a high speed of 4500 r / min to start the centrifugal timing. After the centrifugal timing is completed, the heating and drying mechanism is started. During the drying process, the real-time weight is continuously detected. After the weight of the first and second centrifugal drying and weighing devices is constant, the sensor of the weighing module transmits the constant weight to the control system, calculates the crude pulp rate of the measured slurry sample, and displays the calculation result of the crude pulp rate on the liquid crystal display screen of the control cabinet.

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