Automatic weighing and quantitative loading device for pre-vacuum conditioning of tobacco sheet

Abstract

The present application provides a kind of vacuum before moisture content front piece tobacco automatic weighing ration loading device, it is related to tobacco processing technical field.The device includes: belt conveyor and vacuum moisture content special turnover box, and the both ends of belt conveyor are connected with tobacco slicer and vacuum moisture content special turnover box, and piece tobacco is transported to vacuum moisture content special turnover box by belt conveyor, and the feeding end to the discharge end of belt conveyor is sequentially provided with material stirring shaping mechanism, negative pressure dust removal mechanism and ration loading assembly, and material stirring shaping mechanism includes material stirring roller, for the material stirring shaping of piece tobacco;Vacuum moisture content special turnover box bottom is provided with weighing base, and ration loading assembly includes weighing feedback cylinder, cylinder support, blanking flow guide plate and flow guide plate support, and blanking flow guide plate is connected with flow guide plate support by buffer spring.The device can automatically weigh piece tobacco in turnover box before vacuum moisture content, and according to the weighing result adjustment realizes ration loading, guarantees the weight stability and consistency of piece tobacco in turnover box.

Description

TECHNICAL FIELD

[0001] The present application relates to the tobacco processing technical field, and particularly relates to an automatic weighing and quantitative loading device for tobacco before vacuum conditioning. BACKGROUND

[0002] In the production process of a cigarette production enterprise, tobacco bales are cut into pieces by a piece cutting machine in a piece cutting process section, and the tobacco pieces are output in a certain width. The tobacco pieces are transported by a belt conveyor into a special turnover box for vacuum conditioning, and then enter a vacuum conditioning process. The vertical piece cutting machine is an important equipment in the piece tobacco conditioning process section of the tobacco primary processing production line. The function of the vertical piece cutting machine is to cut the tobacco bales into pieces, so that the tobacco pieces can be evenly fed into the conditioning machine, and the tobacco pieces are easy to be loose and conditioned. The vertical piece cutting technology cuts the tobacco leaves after unpacking into several pieces with equal thickness, which is a guarantee for the fine processing of the piece tobacco production of the primary processing line.

[0003] The main function of the vacuum conditioning process is to increase the temperature and moisture content of the tobacco pieces, so as to improve the processing resistance of the tobacco pieces, reduce the odor, and improve the sensory quality of the cigarette. It is a guarantee for the fine processing of the piece tobacco production of the primary processing line. The principle of the vacuum conditioning is as follows: the tobacco pieces after cutting are sent into a vacuum box by a conveying mechanism in a special turnover box for vacuum conditioning; after the vacuum box is closed, a vacuum system is used to draw a vacuum to reach a specified negative pressure value (vacuum drawing process); then the steam-water mixture is sprayed into the box, and under the action of the vacuum pressure difference, the steam-water mixture is rapidly atomized and rapidly enters the tobacco pieces and fully contacts the tobacco leaves. Through heat transfer and condensation, the mass transfer and heat transfer to the tobacco leaves are realized, the moisture content of the tobacco leaves is increased, and the temperature is increased (steam conditioning process). After a certain period of time, the water and heat absorbed on the surface of the tobacco leaves continuously penetrate into the tobacco leaves, the tobacco leaf tissue restores the elasticity and expands, the surface adhesion of the tobacco leaves is reduced, and the tobacco leaves are deformed and loose. At the same time, as the steam-water is continuously absorbed, the pressure difference between the steam-water mixture and the tobacco leaves gradually decreases, and the mass transfer and heat transfer effect gradually decreases (heat preservation process). Therefore, the vacuum, steam conditioning and heat preservation can be repeated according to the needs until the moisture content and temperature of the tobacco leaves reach the specified requirements, and the loose degree and flexibility of the tobacco leaves reach the requirements; then the reverse pumping is carried out to remove the gas in the box, the gas pressure in the box is increased (reverse pumping and air breaking), and finally the box is opened for discharging.

[0004] In the process section of tobacco leaf unloading and slicing, the tobacco bale is outputted by a predetermined width of tobacco slice through a slicing machine process, and the tobacco slice enters a special turnover box for vacuum conditioning through a belt conveyor. In actual production, when the tobacco slice enters the special turnover box for vacuum conditioning through the belt conveyor, the tobacco slice will be stacked on one side close to the special turnover box for vacuum conditioning, resulting in uneven loading of the tobacco slice in the special turnover box for vacuum conditioning. Artificial intervention is required, which increases the labor intensity of the workers. The flow of the tobacco slice on the belt conveyor is unstable, which can cause uneven loading weight between each special turnover box for vacuum conditioning. When the loading weight of the special turnover box for vacuum conditioning is uneven, the products outputted by the vacuum conditioning process are prone to clumping and wet mass. If the amount of tobacco leaf in the special turnover box for vacuum conditioning is too much, the vacuum conditioning process will not be complete, resulting in clumped tobacco cake. On the contrary, if the amount of tobacco leaf in the special turnover box for vacuum conditioning is too small, the moisture content of the tobacco leaf is uneven, and the temperature is too high. When the tobacco leaf is processed in the loose conditioning process, the inlet moisture content fluctuates greatly, which affects the processing qualified rate of the next process and the internal quality of the product.

[0005] In view of the above reasons, the present application provides a kind of automatic weighing and quantitative loading device for tobacco slice before vacuum conditioning to solve the above technical problems. SUMMARY

[0006] The purpose of the present application is to provide an automatic weighing and quantitative loading device for tobacco slice before vacuum conditioning, which can automatically weigh the tobacco slice in the special turnover box for vacuum conditioning before vacuum conditioning, and adjust the weight according to the weighing structure to achieve quantitative loading. The device can also shape the tobacco slice, ensure the stability and consistency of the weight of the tobacco slice in the special turnover box for vacuum conditioning, reduce the clumping and wet mass of the tobacco slice after vacuum conditioning, improve the sensory quality of the tobacco slice, and increase the utilization rate of the tobacco slice.

[0007] The present application provides a kind of vacuum before piece tobacco automatic weighing ration loading device, comprising: belt conveyor and vacuum special turnover box of moisture regain, the material inlet of the belt conveyor is connected with the outlet of slicer, the vacuum special turnover box of moisture regain is set in the material outlet below the belt conveyor, and the piece tobacco formed by the piece tobacco of the piece tobacco of the piece tobacco via the slicer is transported to the vacuum special turnover box of moisture regain by the material inlet of the belt conveyor to the material outlet, and it is sequentially provided with material poking shaping mechanism, negative pressure dust removal mechanism and ration loading assembly from the material inlet to the material outlet of the belt conveyor, the material poking shaping mechanism includes the rotatable poking roller of being erected above the belt conveyor, for the poking shaping of piece tobacco;The negative pressure dust removal mechanism is used for the dust removal of piece tobacco;The bottom of the vacuum special turnover box of moisture regain is provided with weighing base, and the ration loading assembly is set in the material outlet of the belt conveyor, and the ration loading assembly includes weighing feedback cylinder, cylinder support, blanking flow guide plate and flow guide plate support, the cylinder support is set in the material outlet of the belt conveyor, the weighing feedback cylinder is installed on the cylinder support, the flow guide plate support is fixedly connected with the piston end of the weighing feedback cylinder, the side surface of the blanking flow guide plate is connected with the flow guide plate support, and the bottom surface of the blanking flow guide plate is connected with the flow guide plate support by at least one buffer spring.

[0008] Preferably, the cylinder support is inverted U-shaped, is vertically installed on the both sides of the baffle of the material outlet of the belt conveyor, the piston end of the weighing feedback cylinder is installed on the side surface of the cylinder support downward, the flow guide plate support is L-shaped, the piston end of the weighing feedback cylinder is fixedly connected with the top of the side plate of the flow guide plate support, and the bottom plate of the flow guide plate support is erected in the inner side of the cylinder support.

[0009] Preferably, the blanking flow guide plate is connected by the relative bending of the first plate piece and the second plate piece, the first plate piece is fixedly connected with the side plate of the flow guide plate support through the upper connecting hinge, and the second plate piece is fixedly connected with the side plate of the flow guide plate support through the lower connecting hinge.

[0010] Preferably, the bottom of the first plate piece is connected with the bottom plate of the flow guide plate support by two buffer springs, and the elastic coefficients of the two buffer springs are different.

[0011] Preferably, the relative bending angle of the first plate piece and the second plate piece is 120 °-150 °.

[0012] Preferably, the material stirring shaping mechanism further comprises a mounting frame, a bearing seat, a speed reducer and an electric actuator, both ends of the stirring roller are mounted on the mounting frame through the bearing seat, the speed reducer is fixed on the mounting frame and connected with the stirring roller through a shaft coupling, the bottom end of the mounting frame is connected with the electric actuator, the electric actuators are arranged on both sides of the discharge end of the belt conveyor respectively, the stirring roller comprises a roller body and four stirring plates uniformly arranged on the outer circumferential surface thereof, and a plurality of stirring teeth are uniformly arranged on the stirring plates.

[0013] Preferably, the negative pressure dust removal mechanism is a negative pressure bin, and the top of the vacuum moisture recovery special turnover box is also provided with the negative pressure bin, and the top of the negative pressure bin is connected with the environment dust removal pipeline through a negative pressure pipeline.

[0014] Preferably, the weighing base comprises a supporting base, a transmission roller support, transmission rollers, a weighing sensor and a sensor mounting seat, the transmission roller support is arranged on the top of the supporting base, the transmission rollers are uniformly arranged and rotatably mounted on the transmission roller support, the bottom of the vacuum moisture recovery special turnover box is arranged on the transmission rollers, the sensor mounting seats are arranged at four corners of the supporting base respectively, the weighing sensor is mounted on the inner side of the sensor mounting seat, and the weight signal measured by the weighing sensor is transmitted to a PLC, and the PLC can analyze the weight signal and control the action of the weighing feedback cylinder after receiving the weight signal.

[0015] Preferably, the surface of the belt conveyor is further provided with a converging plate near the discharge end thereof, and the included angle between the converging plate and the baffle plate is 15°-30°.

[0016] Preferably, the bottom of the belt conveyor is provided with a rack, and the discharge end of the belt conveyor is upwardly inclined and located above the top opening of the vacuum moisture recovery special turnover box.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1.The device can weigh and quantitatively load the cut tobacco after the slicing machine, has the function of shaping the material on the belt conveyor, weighs the special turnover box for vacuum moisture recovery through the weighing base, adjusts the height and angle of the material falling guide plate according to the weight signal or information to adjust the weight of the material falling into the special turnover box for vacuum moisture recovery, realizes the automatic weighing and quantitative loading function in front of the special turnover box for vacuum moisture recovery, solves the problem of uneven loading of the special turnover box for vacuum moisture recovery, improves the uniformity of the tobacco entering the vacuum moisture recovery process, reduces the probability of tobacco clumping and wet mass in the vacuum moisture recovery process, improves the utilization rate of tobacco raw materials, and ensures the stability of the tobacco processing process and the comprehensive quality of the product;

[0019] 2.The device has the function of shaping the material on the belt conveyor, reduces the error of manual material shaping by the production personnel, and ensures the material conveying efficiency;

[0020] 3.The dust generated in the transportation of tobacco can be sucked into the negative pressure dust removal mechanism installed on the belt conveyor, reducing the cleaning work of the operator caused by dust, reducing the energy consumption of the negative pressure pipeline dust removal equipment and environmental dust removal equipment, and ensuring the occupational health and safety of the production personnel. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0022] Figure 1 It is the overall structure diagram of the device of the present application;

[0023] Figure 2 It is the structure enlargement drawing of the material shaping mechanism in the present application;

[0024] Figure 3 It is the structure enlargement drawing of the quantitative loading assembly in the present application;

[0025] Figure 4 It is the structure enlargement drawing of the weighing base in the present application;

[0026] Figure 5 It is the structure enlargement drawing of the negative pressure bin in the present application;

[0027] Figure 6 It is the structure enlargement drawing of the material falling guide plate in the present application;

[0028] Figure 7 is a structure of the stirring roller in the application;

[0029] Figure 8 is a working principle diagram of the weighing base and the quantitative feeding assembly in the application;

[0030] Figure 9 is a process flow diagram of the automatic weighing and quantitative feeding in the application.

[0031] Explanation of reference signs:

[0032] 1: belt conveyor; 2: rack; 3: baffle; 4: air cylinder support; 5: special turnover box for vacuum moisture recovery; 6: support base; 7: sensor mounting seat; 8: weighing sensor; 9: electric actuator; 10: mounting frame; 11: stirring roller; 111: roller body; 112: stirring plate; 113: stirring tooth; 12: speed reducer; 13: negative pressure bin; 14: converging plate; 15: guide plate support; 16: weighing feedback air cylinder; 17: blanking guide plate; 171: first plate; 172: second plate; 18: upper connecting hinge; 19: lower connecting hinge; 20: first buffer spring; 21: second buffer spring; 22: transmission roller. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be described below in conjunction with the embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0035] Furthermore, the terms "first", "second", "third", etc. are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or a quantity of indicated technical features. Thus, features with "first", "second", "third" designations can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise explicitly specifically defined. In addition, the terms "mounting", "connected", "connecting" should be interpreted broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be connected internally between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] As Figures 1-7As shown, the present application provides an automatic weighing and quantitative loading device for front sheet tobacco before vacuum conditioning, which comprises a belt conveyor 1 and a vacuum conditioning special turnover box 5. The feeding end of the belt conveyor 1 is connected with the outlet of a slicing machine, and the vacuum conditioning special turnover box 5 is arranged below the discharging end of the belt conveyor 1. The sheet tobacco formed after the tobacco pile is sliced by the slicing machine can be conveyed by the belt conveyor 1 to the vacuum conditioning special turnover box 5, so as to perform subsequent vacuum conditioning process. A material stirring and shaping mechanism, a negative pressure dust removal mechanism and a quantitative loading assembly are sequentially arranged from the feeding end to the discharging end of the belt conveyor 1. The material stirring and shaping mechanism comprises a rotatable material stirring roller 11 arranged above the feeding end of the belt conveyor 1, which is used for stirring and shaping the sheet tobacco so as to be conveyed along the surface of the belt conveyor 1 in a specific form. The negative pressure dust removal mechanism adopts a negative pressure bin 13 arranged on the surface of the belt conveyor 1 and the vacuum conditioning special turnover box 5, which is used for removing dust from the sheet tobacco by negative pressure suction. The bottom of the vacuum conditioning special turnover box 5 is provided with a weighing base, which can weigh the vacuum conditioning special turnover box 5 and the sheet tobacco inside. The quantitative loading assembly is arranged at the discharging end of the belt conveyor 1 and comprises a weighing feedback cylinder 16, a cylinder support 4, a material falling guide plate 17 and a guide plate support 15. The cylinder support 4 is arranged at the discharging end of the belt conveyor 1, the weighing feedback cylinder 16 is installed on the cylinder support 4, and the guide plate support 15 is fixedly connected with the piston end of the weighing feedback cylinder 16. According to the weight signal provided by the weighing base, the piston rod of the weighing feedback cylinder 16 can be controlled to extend and retract by a controller such as PLC according to the weight signal, so as to drive the guide plate support 15 to ascend and descend. The side surface of the material falling guide plate 17 is rotationally connected with the guide plate support 15, and the bottom surface of the material falling guide plate 17 is connected with the guide plate support 15 through at least one buffer spring. By ascending and descending of the guide plate support 15, the height and angle of the material falling guide plate 17 can be adjusted, so as to adjust the gap size between the material falling guide plate 17 and the discharging end of the belt conveyor 1. In combination with the start and stop of the belt conveyor 1, the quantitative adjustment and loading of the weight of the sheet tobacco falling into the vacuum conditioning special turnover box 5 can be realized, the automatic weighing and quantitative loading function before the vacuum conditioning special turnover box is realized, the problem of uneven loading of the sheet tobacco in the vacuum conditioning special turnover box is solved, the material uniformity of the sheet tobacco entering the vacuum conditioning process through the vacuum conditioning special turnover box is improved, the probability of sheet tobacco caking and wet mass in the vacuum conditioning process is reduced, the utilization rate of the sheet tobacco raw material is improved, and the stability of the sheet tobacco processing process and the comprehensive quality of the product are ensured.

[0037] Specifically, the bottom of the belt conveyor 1 is provided with a rack 2 for supporting the belt conveyor 1, and both sides of the belt conveyor 1 are provided with baffles 3 fixedly connected with the rack 2. The baffles 3 can prevent the tobacco strips from falling from both sides of the belt conveyor 1 during the conveying process. The height of both sides of the rack 2 is set so that the discharge end of the belt conveyor 1 is upwardly inclined and located above the top opening of the special turnover box for vacuum conditioning. The tobacco strips conveyed along the belt conveyor 1 can fall into the special turnover box for vacuum conditioning from the discharge end thereof. The special turnover box for vacuum conditioning is a turnover box body which can be conveniently moved up and down on the weighing base and transported to the vacuum conditioning process section by a trolley or the like for vacuum conditioning treatment.

[0038] The cylinder support 4 is in the shape of an inverted U, and the open end thereof is vertically installed on both sides of the discharge end of the belt conveyor 1. The piston end of the weighing feedback cylinder 16 is downwardly installed on the inner side of the cylinder support 4. The flow guide support 15 is in the shape of an L. The piston end of the weighing feedback cylinder 16 is fixedly connected with the top of the side plate of the flow guide support 15 by bolts. The bottom plate of the flow guide support 15 is arranged on the inner side of the cylinder support 4, and the bottom plate of the flow guide support 15 forms an angle of 150° with the cylinder support 4. The bottom plate of the flow guide support 15 is upwardly inclined at an angle of 45° with respect to the special turnover box for vacuum conditioning. The discharge guide plate 17 is connected with the flow guide support 15 by a connecting hinge. The discharge guide plate 17 is a V-shaped plate which is integrally connected by relative bending of a first plate member 171 and a second plate member 172. The side of the first plate member 171 is connected with the side plate of the flow guide support 15 by an upper connecting hinge 18. The second plate member 172 is connected with the side plate of the flow guide support 15 by a lower connecting hinge 19. The relative bending angle of the first plate member 171 and the second plate member 172 is 120°-150°. In this embodiment, the relative bending angle of the first plate member 171 and the second plate member 172 is 150°, forming a shape with low sides and a high middle. The discharge guide plate 17 and the flow guide support 15 leave a certain gap on both sides. The flow guide support 15 and the cylinder support 4 leave a certain gap on both sides. The tobacco strips uniformly slide into the special turnover box for vacuum conditioning through the discharge guide plate 17, reducing the impact force of the tobacco strips falling directly from the belt conveyor 1 onto the special turnover box for vacuum conditioning, making the distribution of the tobacco strips entering the special turnover box for vacuum conditioning from the belt conveyor 1 more uniform, thereby ensuring the stability of the tobacco flow in the vacuum conditioning process, solving the problem of the tobacco strips in the special turnover box for vacuum conditioning tilting to one side, eliminating the dust raising phenomenon of the tobacco strips falling directly from the belt conveyor into the special turnover box for vacuum conditioning, reducing the energy consumption for environmental dust removal, reducing the labor intensity of the workers for stirring the tobacco strips in the special turnover box for vacuum conditioning, and ensuring the occupational health and safety of the production personnel.

[0039] The bottom of the first plate member 171 is connected with the bottom plate of the flow guide bracket 15 through the first buffer spring 20 and the second buffer spring 21, and the elastic coefficients of the first buffer spring 20 and the second buffer spring 21 are different. The first buffer spring 20 and the second buffer spring 21 are used for supporting the material falling flow guide plate 17. When the weight of the strip tobacco is too large, the spring is compressed, and the deformation of the material falling flow guide plate 17 caused by the pressure is reduced.

[0040] Specifically, the material stirring and shaping mechanism further comprises a mounting frame 10, a bearing seat, a speed reducer 12 and an electric actuator 9, both ends of the stirring roller 11 are mounted on the mounting frame 10 through the bearing seat, the speed reducer 12 is fixed on the mounting frame 10 and connected with the stirring roller 11 through a shaft coupling to drive the stirring roller 11 to rotate, the bottom end of the mounting frame 10 is connected with the electric actuator 9, the electric actuator 9 is arranged on the baffle 3 on both sides of the inlet end of the belt conveyor 1 respectively, the stirring roller 11 comprises a roller body 111 and four stirring plates 112 uniformly arranged on the outer circumferential surface thereof, and a plurality of stirring teeth 113 are uniformly distributed on the stirring plates. In this embodiment, the length of the roller body 111 is 1000mm, the sawtooth-shaped stirring teeth 113 are arrayed on the stirring plate 112, the tooth width of the stirring teeth 113 is 20mm, the tooth height is 25mm, the tooth face angle is 40°, the adjacent tooth pitch is 40mm, and the tooth top circle diameter is 100mm. During the rotation of the stirring roller 11, the stirring roller 11 has the functions of combing and stirring. When the strip tobacco on the belt conveyor 1 below the stirring roller 11 flows forward, the stirring plate 112 can stir and rotate the protruding strip tobacco, so that the strip tobacco flow is uniform and the material shape is flat. The stirring plate 112 is made of flexible material and will not cause great damage to the strip tobacco, thereby reducing the blocking phenomenon caused by the stirring roller 11. The stirring roller 11 can uniformly stir and shape the strip tobacco, so that the strip tobacco is uniformly and stably conveyed on the belt conveyor 1, the strip tobacco flow becomes more stable, and the strip tobacco is more uniformly distributed on the belt conveyor 1. The problems of uneven distribution and hardening of the strip tobacco on the belt conveyor 1 are solved, and the phenomenon of uneven flow of the strip tobacco when the strip tobacco passes through the belt conveyor 1 and enters the vacuum moisture recovery special turnover box 4 is avoided. The rotation speed of the stirring roller 11 is controlled by the speed reducer, and the stirring roller 11 is driven to rise and fall in the direction perpendicular to the surface of the belt conveyor 1 by the electric actuator 9. During the production of the batch material, the stirring roller 11 rotates rapidly and the height of the material stirring and shaping mechanism is constant, so that the synchronous operation and the purpose of uniform material are achieved, the stability of the strip tobacco flow is realized, the consistency of the boxing weight is ensured, and the stability of the strip tobacco flow on the belt conveyor 1 and the comprehensive quality of the product are improved.

[0041] In this embodiment, the arc surface of the negative pressure bin 13 is provided with arrayed micro holes, and the dust generated by the strip tobacco thrown up by the stirring roller 11 can be sucked into the negative pressure bin 13 through negative pressure. The negative pressure pipeline at the top of the negative pressure bin 13 is connected with the environment dust removal pipeline, thereby reducing the labor intensity of the operators caused by the dust and ensuring the occupational health and safety of the production personnel.

[0042] Specifically, the surface of the belt conveyor 1 is further provided with two converging plates 14 near the discharge end thereof, the converging plates 14 are fixedly connected with the baffles 3 on both sides of the belt conveyor 1, and the included angle between the converging plates 14 and the baffles 3 is 15°-30°. In this embodiment, the included angle between the converging plates 14 and the baffles 3 is 15°, and the distance between the two converging plates 14 decreases to the discharge end, so that the tobacco strips are converged to the middle part of the belt conveyor 1.

[0043] The weighing base comprises a supporting base 6, a transmission roller support, transmission rollers 22, a weighing sensor 8 and a sensor mounting seat 7. The transmission roller support is arranged on the top of the supporting base 6, the transmission rollers 22 are uniformly arranged and rotatably mounted on the transmission roller support, the bottom of the special turnover box 4 for vacuum conditioning is arranged on the transmission rollers 22, the sensor mounting seat 7 is arranged at each corner of the supporting base 6, the weighing sensor 8 is mounted on the inner side of the sensor mounting seat 7, the weight signal measured by the weighing sensor 8 can be transmitted to the PLC through the transmitter, and the PLC can analyze the weight signal and control the action of the weighing feedback cylinder 16 and the start and stop of the belt conveyor 1 after receiving the weight signal.

[0044] The specific working process is as follows: after the strip tobacco is shaped by the poking roller 11 on the belt conveyor 1, it is preliminarily dedusted by the negative pressure bin 13, and is gathered to the middle of the belt conveyor 1 under the action of the material collecting plate 14. At this time, the piston rod of the weighing feedback cylinder 16 is fully extended, the strip tobacco falls into the vacuum moisture-proof special turnover box 4 through the blanking guide plate 17, at this time, the whole strip tobacco in the vacuum moisture-proof special turnover box 4 is accumulated on the side far away from the belt conveyor 1, when the weight of the vacuum moisture-proof special turnover box 4 measured by the weighing base reaches 50% of the preset weight, the belt conveyor 1 stops, the weighing feedback cylinder 16 receives the signal, the piston rod is fully retracted, the guide plate support 15 rises, the belt conveyor 1 starts again, and the strip tobacco is conveyed into the vacuum moisture-proof special turnover box 4, the loading weight is measured by the weighing base, when the loading weight is greater than the preset weight, the belt conveyor 1 stops running, and the vacuum moisture-proof special turnover box 4 is input into the next station through the transmission roller 22 and the conveying equipment connected therewith. The loading of the strip tobacco in the vacuum moisture-proof special turnover box 4 is divided into two processes through the rising and falling of the weighing feedback cylinder 16, in the first process, the whole strip tobacco is accumulated on the side far away from the belt conveyor 1, in the second process, the strip tobacco is free fall after passing through the belt conveyor 1, the whole strip tobacco of this part is close to the belt conveyor 1, and the internal material loading of the vacuum moisture-proof special turnover box 4 is uniform after being dispersed. The strip tobacco is dispersed and uniform in the vacuum moisture-proof special turnover box after passing through the quantitative loading unit, so that the uniformity and stability of the strip tobacco flow in the vacuum moisture-proof process are ensured; meanwhile, the problem of uneven loading of the strip tobacco in the vacuum moisture-proof special turnover box is solved, the material uniformity of the strip tobacco entering the vacuum moisture-proof process through the vacuum moisture-proof special turnover box is improved, the probability of strip tobacco caking and wet mass in the vacuum moisture-proof process is reduced, the utilization rate of the strip tobacco raw material is improved, and the stability of the strip tobacco processing process and the comprehensive quality of the product are ensured.

[0045] As shown in Figure 8 The weighing base collects the weight signal of the vacuum moisture-proof special turnover box 4 in real time through the weighing sensor 8, compares the weight signal with the set weight of the vacuum moisture-proof special turnover box 4 calculated according to the production brand after signal processing by the PLC, controls the start and stop of the belt conveyor 1, so that the loading amount of the strip tobacco between the vacuum moisture-proof special turnover boxes 4 is consistent, and the automatic quantitative loading function is realized. The device adopts the weighing method of the weighing roller conveyor, and the working principle is as follows: the weighing sensor 8 fixed at the four corners of the support base 6 generates a mv weight signal under the action of the excitation voltage, which enters the junction box. Usually, an amplification circuit board is arranged in the junction box, a v-level voltage after amplification is sent to the transmitter for processing and calculation, a signal is output in the RS232 mode to communicate with the operation screen, and a standard electric signal is output to the PLC analog input module. The PLC calculates the weight signal through an algorithm.

[0046] As shown in Figure 9As shown, the control flow of the weighing base is as follows: when the production order is issued to the slicing process section, the pretreatment section PLC calculates the preset weight m=M / a of the vacuum moisture recovery special turnover box 4 according to the current grade of the feeding amount M and the specified boxing amount a of the production process. After the vacuum moisture recovery special turnover box 4 reaches below the belt conveyor 1, the weighing base measures the weight of the vacuum moisture recovery special turnover box 4, and after the measurement is completed, the weight is taken as the tare weight and is cleared; the pretreatment section PLC controls the piston of the weighing feedback cylinder 16 to fully extend, and after the pretreatment section PLC detects the piston extension proximity switch signal, the pretreatment section PLC sends a feeding signal to the slicing machine through Ethernet communication, the belt conveyor 1 at the outlet of the slicing machine starts, and the sliced tobacco is sent into the vacuum moisture recovery special turnover box 4; when the preset weight m / 2 is reached, the pretreatment section PLC sends a stop feeding signal to the slicing machine, the belt conveyor 1 at the outlet of the slicing machine stops, the pretreatment section PLC controls the piston rod of the weighing feedback cylinder 16 to fully retract, and after the pretreatment section PLC detects the piston retraction proximity switch signal, the pretreatment section PLC sends a feeding signal to the slicing machine again, and the belt conveyor 1 at the outlet of the slicing machine restarts. The PLC compares the collected boxing weight with the preset amount, and when the boxing amount is greater than the preset amount m, the pretreatment section PLC sends a stop feeding signal to the slicing machine, the belt conveyor 1 at the outlet of the slicing machine stops running, and the boxing process is completed, and the vacuum moisture recovery special turnover box 4 is conveyed to the next station.

[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part 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 application.

Claims

1. An automatic weighing and quantitative filling device for pre-vacuum rehumidification tobacco sheets, characterized in that, include: The system includes a belt conveyor and a vacuum rehumidification turnover box. The inlet end of the belt conveyor is connected to the outlet end of the slicer. The vacuum rehumidification turnover box is located below the outlet end of the belt conveyor. The tobacco flakes, formed by slicing the tobacco stacks by the slicer, are conveyed to the vacuum rehumidification turnover box by the belt conveyor. From the inlet end to the outlet end of the belt conveyor, a material-feeding and shaping mechanism, a negative pressure dust removal mechanism, and a quantitative feeding assembly are sequentially arranged. The material-feeding and shaping mechanism includes a rotatable material-feeding roller mounted above the belt conveyor for shaping the tobacco flakes. The negative pressure dust removal mechanism is used to remove dust from the tobacco flakes. A weighing device is installed at the bottom of the vacuum rehumidification turnover box. A weighted base is provided. The quantitative feeding assembly is located at the discharge end of the belt conveyor. The quantitative feeding assembly includes a weighing feedback cylinder, a cylinder bracket, a material discharge guide plate, and a guide plate bracket. The cylinder bracket is inverted U-shaped and vertically installed on both side baffles of the discharge end of the belt conveyor. The weighing feedback cylinder is mounted on the cylinder bracket, with its piston end installed downwards along the side of the cylinder bracket. The guide plate bracket is L-shaped, with the piston end of the weighing feedback cylinder fixedly connected to the top of the side plate of the guide plate bracket. The bottom plate of the guide plate bracket is mounted inside the cylinder bracket. The side of the material discharge guide plate is connected to the guide plate bracket. The bottom surface of the material guide plate is connected to the guide plate bracket by at least one buffer spring. The weighing base includes a support base, a transmission roller bracket, transmission rollers, a weighing sensor, and a sensor mounting base. The transmission roller bracket is located on the top of the support base. The transmission rollers are evenly arranged and rotatably mounted on the transmission roller bracket. The bottom of the vacuum rehumidification special turnover box is placed on the transmission rollers. Sensor mounting bases are respectively provided at the four corners of the support base. The weighing sensor is installed inside the sensor mounting base. The weight signal measured by the weighing sensor is transmitted to the PLC. After receiving the weight signal, the PLC can analyze it and control the weighing feedback. When the cylinder actuates, the piston rod of the weighing feedback cylinder extends fully, and the tobacco flakes fall into the vacuum rehumidification special turnover box via the material guide plate. At this time, the tobacco flakes in the vacuum rehumidification special turnover box are piled up on the side away from the belt conveyor. When the weighing base measures that the weight of the vacuum rehumidification special turnover box reaches 50% of the preset weight, the belt conveyor stops. The weighing feedback cylinder receives a signal, the piston rod retracts fully, the guide plate support rises, and the belt conveyor restarts, conveying tobacco flakes into the vacuum rehumidification special turnover box. When the weighing base measures the loading weight, and the loading weight is greater than the preset weight, the belt conveyor stops running.

2. The automatic weighing and quantitative feeding device for pre-vacuum rehumidified tobacco according to claim 1, characterized in that, The material discharge guide plate is formed by bending and connecting a first plate and a second plate. The first plate is fixedly connected to the side plate of the guide plate bracket via an upper connecting hinge, and the second plate is fixedly connected to the side plate of the guide plate bracket via a lower connecting hinge.

3. The automatic weighing and quantitative feeding device for pre-vacuum rehumidified tobacco according to claim 2, characterized in that, The bottom of the first plate is connected to the base plate of the guide plate bracket by two buffer springs, and the elastic coefficients of the two buffer springs are different.

4. The automatic weighing and quantitative feeding device for pre-vacuum rehumidification tobacco according to claim 2, characterized in that, The relative bending angle between the first plate and the second plate is 120°~150°.

5. The automatic weighing and quantitative feeding device for pre-vacuum rehumidified tobacco according to claim 1, characterized in that, The material feeding and shaping mechanism further includes a mounting frame, bearing seats, a reducer, and an electric actuator. The two ends of the feeding roller are mounted on the mounting frame through the bearing seats. The reducer is fixed on the mounting frame and connected to the feeding roller through a coupling. The bottom end of the mounting frame is connected to the electric actuator. The electric actuator is respectively arranged on both sides of the feed end of the belt conveyor. The feeding roller includes a roller body and four feeding plates evenly arranged on its outer circumference. The feeding plates are evenly provided with a number of feeding teeth.

6. The automatic weighing and quantitative feeding device for pre-vacuum rehumidification tobacco according to claim 1, characterized in that, The negative pressure dust removal mechanism is a negative pressure chamber. The top of the vacuum rehumidification special turnover box is also equipped with the negative pressure chamber. The top of the negative pressure chamber is connected to the environmental dust removal pipe through a negative pressure pipe.

7. The automatic weighing and quantitative feeding device for pre-vacuum rehumidification tobacco according to claim 1, characterized in that, A gathering plate is also provided on the surface of the belt conveyor near its discharge end, and the angle between the gathering plate and the baffle is 15°~30°.

8. The automatic weighing and quantitative feeding device for pre-vacuum rehumidification tobacco according to claim 1, characterized in that, The bottom of the belt conveyor is equipped with a frame, and the discharge end of the belt conveyor is inclined upward and located above the top opening of the vacuum rehumidification special turnover box.

Images