High-precision raw tobacco pre-pressing framing system and framing method

Abstract

The high-precision raw tobacco pre-pressing and framing system comprises an upper-layer reciprocating material distributing machine, a lower-layer reciprocating material distributing machine, tobacco pressing devices and a controller, the upper-layer reciprocating material distributing machine is arranged above the lower-layer reciprocating material distributing machine, tobacco is fed into the lower-layer reciprocating material distributing machine, the tobacco pressing devices are arranged on the two sides of the lower-layer reciprocating material distributing machine respectively, and the controller is connected with the upper-layer reciprocating material distributing machine. The cigarette pressing device comprises a micro-pressure device, a static weighing device, a motor, a pressing head, a material storage hopper, a movable hopper, a movable hopper air cylinder, a lifting device, a rack and a cigarette frame weighing supporting frame, and further comprises material supplementing conveying belts, a high-precision material supplementing device, a material supplementing hopper and a material storage conveying belt, one end of the material supplementing conveying belt conveys tobaccos into the material storage hopper through the material supplementing hopper, the other end of the material supplementing conveying belt receives the tobaccos conveyed into the material storage conveying belt through the high-precision material supplementing device, and the controller is connected with the high-precision material supplementing device, the static weighing device, the motor, the movable hopper air cylinder, the material storage conveying belt and the lifting device.

Description

Technical Field

[0001] The invention relates to the field of tobacco processing, in particular to a high-precision raw cigarette pre-pressing and framing system. Background Art

[0002] The original cigarette framing process currently adopts the method of manual framing after selection, or pre-pressing framing. Since there is no weighing in the framing process of manual framing, a separate re-weighing process must be set up after manual framing to control the amount of cigarettes loaded in the cigarette frame. Pre-pressing framing has the problem of uneven density of materials in the cigarette frame after pre-pressing due to inaccurate control of the framing amount and uneven distribution of materials in the cigarette frame. The high-density part is prone to tobacco oil precipitation and cake formation. Even if an electronic belt scale is set up for the framing process, due to dynamic packaging and equipment control accuracy problems, the packaging weight cannot meet the actual cigarette frame packaging accuracy requirements, and a second re-weighing is required to ensure the weight accuracy of the framing materials. The existing method has uneven material distribution and material weight control requires a second re-weighing, which occupies a large area, has complex links, requires a large number of people, and has high manual work intensity. Summary of the invention

[0003] The invention of the present application aims to provide a high-precision raw cigarette pre-pressing and framing system and framing method in view of the problems existing in the prior art.

[0004] In order to achieve the invention purpose of this application, this application adopts the following technical solutions:

[0005] The invention discloses a high-precision raw cigarette pre-pressing and framing system, which comprises: an upper reciprocating feeder, a lower reciprocating feeder, a smoke pressing device and a controller. The upper reciprocating feeder is arranged above the lower reciprocating feeder to feed tobacco onto the lower reciprocating feeder. A smoke pressing device is provided on both sides of the lower reciprocating feeder. The smoke pressing device comprises: a micro-pressure device, a static weigher, a motor, a pressure head, a storage hopper, a mobile hopper, a mobile hopper cylinder, a lifting device, a frame and a cigarette frame weighing support frame. A storage hopper is fixed to the frames on both sides of the lower reciprocating feeder. The mobile hopper is installed on the frame under the storage hopper and is driven by the mobile hopper cylinder to move up and down along the storage hopper. The static weigher is installed on the ground below the storage hopper. The lifting device is installed on the static weigher. The cigarette frame is placed On the lifting device, and partially overlaps with the mobile hopper in the height direction, the cigarette frame weighing support frame is placed on the outside of the lifting device, and its height is between the strokes of the lifting device. A micro-pressure device is installed on the frame above the storage hopper, and the micro-pressure device is driven by a motor. The pressure head is installed at the lower end of the micro-pressure device, wherein: the high-precision raw cigarette pre-pressing and framing system also includes: a feeding conveyor belt, a high-precision feeding device, a feeding hopper and a storage conveyor belt, and feeding conveyor belts are respectively arranged on both sides of the storage hopper. One end of the feeding conveyor belt feeds tobacco into the storage hopper through the feeding hopper, and the other end of the feeding conveyor belt receives the tobacco fed to the storage conveyor belt through the high-precision feeding device. The controller is respectively connected to the high-precision feeding device, the static weigher, the motor, the mobile hopper cylinder, the storage conveyor belt and the lifting device.

[0006] The high-precision raw cigarette pre-pressing and framing system of the present invention, wherein: the tobacco fed into the upper reciprocating feeder and the two storage conveyor belts is transported by the same tobacco conveying device, and the tobacco conveying device includes: a main conveyor belt, a first conveyor belt, a distribution conveyor belt, a bottom conveyor belt, a second conveyor belt and a third conveyor belt, the main conveyor belt feeds the tobacco into the first conveyor belt, the first conveyor belt feeds the tobacco into the second conveyor belt or one of the storage conveyor belts, the second conveyor belt feeds the tobacco into the distribution conveyor belt, the distribution conveyor belt feeds the tobacco into the upper reciprocating feeder, the upper reciprocating feeder feeds the tobacco into the lower reciprocating feeder or the bottom conveyor belt, and the bottom conveyor belt feeds the tobacco into another storage conveyor belt through the third conveyor belt.

[0007] The high-precision raw cigarette pre-pressing and framing system of the present invention comprises: a dynamic weighing device installed on the distribution conveyor belt, and the dynamic weighing device is connected to the controller.

[0008] The high-precision raw cigarette pre-pressing and framing system of the present invention, wherein: photoelectric detectors are respectively installed at the feeding end, the middle section and the discharging section of the storage conveyor belt.

[0009] The high-precision raw cigarette pre-pressing and framing system of the present invention, wherein: the lower layer reciprocating material distributor is installed on the frame, and is a reciprocating material distributor belt that moves back and forth between two material storage hoppers.

[0010] The high-precision raw cigarette pre-pressing and framing system of the present invention, wherein: the upper reciprocating material distributor is installed on the frame, and is a reciprocating material distributor belt that moves back and forth between the lower reciprocating material distributor and the bottom conveyor belt.

[0011] The high-precision raw cigarette pre-pressing and framing system of the present invention, wherein: the high-precision feeding device is a channel with a multi-head scale, each channel is loaded with tobacco of different weights, and according to the weight of the feeding, the channel loaded with tobacco of related weight sends the tobacco therein into the feeding conveyor belt.

[0012] The method for pre-pressing and framing raw tobacco using the high-precision raw tobacco pre-pressing and framing system of the present invention comprises:

[0013] (1) The smoke frame is in place

[0014] After the smoke frame is placed on the lifting device, the lifting device rises, and at the same time, driven by the moving hopper cylinder, the moving hopper descends into the smoke frame, and the smoke lower layer reciprocating feeder is ready to feed one of the smoke frames;

[0015] (II) Transportation of tobacco

[0016] The tobacco is conveyed to the distribution conveyor belt via the main conveyor belt and the first conveyor belt. As the tobacco passes through the distribution conveyor belt, the dynamic weigher dynamically and continuously weighs the weight of the tobacco. The tobacco is continuously fed into one of the storage hoppers through the upper reciprocating feeder and the lower reciprocating feeder. When the weight of the tobacco reaches the set weight, the dynamic weigher sends a signal to the controller, and the upper reciprocating feeder and the lower reciprocating feeder switch after a delay, completing the feeding of the above storage hopper and preparing to feed another storage hopper. At the same time, the upper reciprocating feeder or the first conveyor belt switches to feed the storage conveyor belt that is replenishing the material for the tobacco pressing device that is about to perform compression.

[0017] (III) Tobacco weighing and feeding

[0018] The static weigher weighs the tobacco in the cigarette frame and transmits the weighing result to the controller. When the weight of the tobacco transmitted to the controller does not reach the set value of the tobacco weight, the controller starts the storage conveyor belt, the high-precision feeding device and the feeding conveyor belt to feed the feeding tobacco into the storage hopper. The static weigher weighs the tobacco in the cigarette frame at any time; when the weight of the tobacco transmitted to the controller reaches the set value of the tobacco weight, the tobacco feeding ends.

[0019] (IV) Compressed tobacco

[0020] The lifting device descends to the lowest position, the cigarette frame is supported by the cigarette frame weighing support frame, the micro-pressure device is driven by the motor, and the pressure head is pressed down into the cigarette frame containing tobacco. After the pressure head is pressed down into place, it stays for a period of time to maintain the pressure to prevent the tobacco from rebounding. After maintaining the pressure, the pressure head rises and the cigarette frame is output; the pre-pressing and framing of the original cigarette is completed.

[0021] The method of the present invention comprises the following steps: the storage conveyor belt runs at a low speed when storing materials so that tobacco is accumulated thereon; the storage conveyor belt runs at a high speed when discharging materials so as to quickly feed the high-precision feeding device; in actual use, the measured weight of the dynamic weighing device is set to 99% of the weight of the tobacco to be loaded in the cigarette frame; then, the weight of the tobacco loaded in the cigarette frame is weighed by a static weighing device; the difference between the set weight and the measured weight of the dynamic weighing device is supplemented by the storage conveyor belt, the high-precision feeding device and the feeding conveyor belt.

[0022] The method of the present invention, wherein: the delay time of the lower reciprocating feeder is the time required for tobacco to be transported from the distribution conveyor belt to the storage hopper; the delay time of the upper reciprocating feeder is the time required for tobacco to be transported from the distribution conveyor belt to the lower reciprocating feeder.

[0023] Beneficial effects:

[0024] The high-precision raw cigarette pre-pressing framing system and framing method of the present invention solve the problem of uniform distribution of raw cigarette packaging materials, the problem of insufficient packaging volume of natural packaging frames, the problem of secondary re-weighing of packaging, and the problem of large deviation of packaging volume. The system structure of this method is simple and flexible, and the system adopts fully automated operation with high productivity, reduces the labor intensity of workers, and can realize unmanned operation of the entire system. This method can promote the development of the national economy in the direction of high quality and high reliability, improve the production structure and environment, save manpower, material resources, financial resources and resources, and obtain overall social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a forward schematic diagram of the high-precision raw cigarette pre-pressing and framing system of the present invention. For the sake of clarity, only part of the frame and part of the connection relationship with the controller are drawn in the figure;

[0026] Figure 2 It is a front perspective schematic diagram of the high-precision raw cigarette pre-pressing and framing system of the present invention;

[0027] Figure 3 It is a reverse perspective schematic diagram of the high-precision raw cigarette pre-pressing and framing system of the present invention.

[0028] exist Figures 1 to 3Among them, number 1 is a feeding conveyor belt; number 2 is a dynamic weigher; number 3 is an upper reciprocating material distributor; number 4 is a lower reciprocating material distributor; number 5 is a high-precision feeding device; number 6 is a micro-pressure device; number 7 is a static weigher; number 8 is a motor; number 9 is a pressure head; number 10 is a feeding hopper; number 11 is a storage hopper; number 12 is a mobile hopper; number 13 is a mobile hopper cylinder; number 14 is a lifting device; number 15 is a storage conveyor belt; number 16 is; number 17 is a frame; number 18 is a controller; number 19 is a cigarette frame weighing support frame; number 20 is a total conveyor belt; number 21 is a first conveyor belt; number 22 is a distribution conveyor belt; number 23 is a bottom conveyor belt; number 24 is a second conveyor belt; number 25 is a third conveyor belt. DETAILED DESCRIPTION

[0029] like Figure 1 As shown, the high-precision raw cigarette pre-pressing and framing system of the present invention comprises: an upper reciprocating feeder 3, a lower reciprocating feeder 4, a tobacco pressing device and a controller 18, the upper reciprocating feeder 3 is arranged above the lower reciprocating feeder 4, and tobacco is fed to the lower reciprocating feeder 4, and there is a tobacco pressing device on both sides of the lower reciprocating feeder 4, and the tobacco pressing device comprises: a micro-pressure device 6, a static weighing device 7, a motor 8, a pressure head 9, a storage hopper 11, a moving hopper 12, a moving hopper cylinder 13, a lifting device 14, a frame 17 and a tobacco frame weighing support frame 19, and a storage hopper is fixed on the frames 17 on both sides of the lower reciprocating feeder 4. Bucket 11, the mobile hopper 12 is installed on the frame 17 under the storage hopper 11, and is driven by the mobile hopper cylinder 13 to move up and down along the storage hopper 11, the static weigher 7 is installed on the ground below the storage hopper 11, the lifting device 14 is installed on the static weigher 7, the cigarette frame 6 is placed on the lifting device 14, and partially overlaps with the mobile hopper 12 in the height direction, the cigarette frame weighing support frame 19 is placed on the outside of the lifting device 14, and its height is between the strokes of the lifting device 14, and a micro-pressure device 6 is installed on the frame 17 above the storage hopper 11, the micro-pressure device 6 is driven by a motor 8, and a pressure head 9 is installed at the lower end of the micro-pressure device 6.

[0030] The high-precision raw cigarette pre-pressing and framing system also includes: a feeding conveyor belt 1, a high-precision feeding device 5, a feeding hopper 10 and a storage conveyor belt 15. The feeding conveyor belts 1 are arranged on both sides of the storage hopper 11. One end of the feeding conveyor belt 1 sends tobacco into the storage hopper 11 through the feeding hopper 10, and the other end of the feeding conveyor belt 1 receives the tobacco sent to the storage conveyor belt 15 through the high-precision feeding device 5. The controller 18 is respectively connected to the high-precision feeding device 5, the static weigher 7, the motor 8, the mobile hopper cylinder 13, the storage conveyor belt 15 and the lifting device 14. Photoelectric detectors (not shown in the figure) are respectively installed at the feeding end, middle section and discharge section of the storage conveyor belt 15.

[0031] like Figure 2 and Figure 3 As shown, the tobacco fed into the upper reciprocating feeder 3 and the two storage conveyor belts 15 is transported by the same tobacco conveying device, which includes: a main conveyor belt 20, a first conveyor belt 21, a distribution conveyor belt 22, a bottom conveyor belt 23, a second conveyor belt 24 and a third conveyor belt 25. The main conveyor belt 20 feeds the tobacco into the first conveyor belt 21, the first conveyor belt 21 feeds the tobacco into the second conveyor belt 24 or one of the storage conveyor belts 15, the second conveyor belt 24 feeds the tobacco into the distribution conveyor belt 22, the distribution conveyor belt 22 feeds the tobacco into the upper reciprocating feeder 3, the upper reciprocating feeder 3 feeds the tobacco into the lower reciprocating feeder 4 or the bottom conveyor belt 23, the bottom conveyor belt 23 feeds the tobacco into another storage conveyor belt 15 through the third conveyor belt 25, and a dynamic weigher 2 is installed on the distribution conveyor belt 22, and the dynamic weigher 2 is connected to the controller 18.

[0032] The lower reciprocating material distributor 4 is mounted on the frame 17, and is a reciprocating material distributor belt that moves back and forth between the two storage hoppers 11. The upper reciprocating material distributor 3 is mounted on the frame 17, and is a reciprocating material distributor belt that moves back and forth between the lower reciprocating material distributor 4 and the bottom conveyor belt 23. The high-precision feeding device 5 is a channel with a multi-head scale, and each channel is loaded with tobacco of different weights. According to the weight of the feeding material, the channel loaded with tobacco of the relevant weight sends the tobacco therein into the feeding conveyor belt 1.

[0033] The method for pre-pressing and framing raw tobacco using the high-precision raw tobacco pre-pressing and framing system of the present invention comprises:

[0034] (1) The smoke frame is in place

[0035] After the cigarette frame 16 is placed on the lifting device 14, the lifting device 14 rises, and at the same time, driven by the mobile hopper cylinder 13, the mobile hopper 12 descends into the cigarette frame 16, and the cigarette lower layer reciprocating feeder 4 is ready to feed one of the cigarette frames 16;

[0036] (II) Transportation of tobacco

[0037] The tobacco is conveyed to the distribution conveyor belt 22 via the main conveyor belt 20 and the first conveyor belt 21. As the tobacco passes through the distribution conveyor belt 22, the dynamic weigher 2 dynamically and continuously weighs the weight of the tobacco. The tobacco is continuously fed into one of the storage hoppers 11 through the upper reciprocating feeder 3 and the lower reciprocating feeder 4. When the weight of the tobacco reaches the set weight, the dynamic weigher 2 sends a signal to the controller 18, and the upper reciprocating feeder 3 and the lower reciprocating feeder 4 reverse after a delay, completing the feeding of the above storage hopper 11 and preparing to feed the other storage hopper 11. The upper reciprocating feeder 3 or the first conveyor belt 21 is reversed to feed the storage conveyor belt 15 for feeding the tobacco pressing device that is about to perform compression. The storage conveyor belt 15 runs at a low speed when storing materials so that tobacco is accumulated on it. When discharging materials, the storage conveyor belt 15 runs at a high speed to quickly feed the high-precision feeding device 5. The delay time of the lower reciprocating feeder 4 is the time required for tobacco to be transported from the distribution conveyor belt 22 to the storage hopper 11; the delay time of the upper reciprocating feeder 3 is the time required for tobacco to be transported from the distribution conveyor belt 22 to the lower reciprocating feeder 4;

[0038] (III) Tobacco weighing and feeding

[0039] The static weigher 7 weighs the tobacco in the cigarette frame 16 and transmits the weighing result to the controller 18. When the weight of the tobacco transmitted to the controller 18 does not reach the set value of the tobacco weight, the controller 18 starts the storage conveyor belt 15, the high-precision feeding device 5 and the feeding conveyor belt 1, and feeds the feeding tobacco into the storage hopper 11. The static weigher 7 weighs the tobacco in the cigarette frame 16 at any time; when the weight of the tobacco transmitted to the controller 18 reaches the set value of the tobacco weight, the tobacco feeding is finished. In actual use, the measured weight of the dynamic weigher 2 is set to 99% of the weight of the tobacco to be loaded in the cigarette frame 16, and then the weight of the tobacco loaded in the cigarette frame 16 is weighed by the static weigher 7. The difference between the set weight and the measured weight of the dynamic weigher 7 is supplemented by the storage conveyor belt 15, the high-precision feeding device 5 and the feeding conveyor belt 1.

[0040] (IV) Compressed tobacco

[0041] The lifting device 14 descends to the lowest position, the cigarette frame 16 is supported by the cigarette frame weighing support frame 19, the micro-pressure device 6 is driven by the motor 8, and the pressure head 9 is pressed downward into the cigarette frame 16 containing tobacco. After the pressure head 9 is pressed down to the right position, it stays for a period of time to maintain the pressure to prevent the tobacco from rebounding. After maintaining the pressure, the pressure head 9 rises and the cigarette frame 16 is output; the pre-pressing and framing of the original cigarette is completed.

[0042] The high-precision feeding device 5 uses the principle of multi-head scale. The minimum weight of the channel of the multi-head scale device is the packing error of the frame system. It is divided into multiple channels inside. Each channel caches materials according to the set weight. Take the specifications and requirements of the common cigarette frames in the original cigarette processing industry as an example: the cigarette frame can hold 400 kg of materials, the packing error is required to be within ±1 kg, the accuracy of the rough scale device is 1%, and the multi-head scale device is set up to ensure production continuity. A total of 8 channels are set, 2 channels are each carrying 0.5 kg of materials, 2 channels are each carrying 1 kg of materials, 2 channels are each carrying 1.5 kg of materials, and 2 channels are each carrying 2 kg of materials. All channels discharge a total of 11 kg of materials. According to, 400 kg of materials require a maximum of 4 kg of materials to meet the needs of 2 times of maximum one-time feeding. Each channel can discharge materials separately, or 2 or more channels can discharge materials together. According to the amount of required feeding given by the rough scale device, the system automatically matches the best distribution channel for discharging. Through the setting of the precision weighing system, the maximum deviation of the weight of each box of raw materials from the design value is increased from 4 kg to 0.5 kg. Each channel can discharge materials individually, or two or more channels can discharge materials together. According to the amount of material replenishment required, the best distribution channel is automatically matched for discharge. Through the setting of the precision weighing device, the deviation of the frame weight is reduced from 4 kg to 0.5 kg, and the accuracy of the frame weight is increased from within 1% to within 0.125%, and it can be further improved according to the setting of the multi-head weigher.

[0043] After the material distribution is completed, the static weighing device 7 finally weighs the material in the cigarette frame 16, and outputs the weight of the material to be replenished to the high-precision feeding device 5. The high-precision feeding device 5 performs feeding. The high-precision feeding device 5 is provided with 8 channels in total, 2 channels each carry 0.5 kg of material, 2 channels each carry 1 kg of material, 2 channels each carry 1.5 kg of material, and 2 channels each carry 2 kg of material. According to the amount of material to be replenished, the best discharge channel is matched, and the material is transported into the feeding hopper 10 through the feeding conveyor belt 1. The feeding hopper 10 is arranged above the storage hopper 11 and is connected with the storage hopper 11. The material reaches the storage hopper 11 through the feeding hopper 10 to complete the feeding. After the material is replenished, the pressure head 9 of the micro-pressure device 6 is driven by the motor 8 to press down, pressing the material in the storage hopper 11 into the cigarette frame 16, and the mobile hopper cylinder 13 drives the mobile hopper 12 to extend into the cigarette box 16. The pressure head 9 maintains its position for a period of time to maintain the pressure (within half a minute). After maintaining the pressure, the pressure head 9 is driven by the motor 8 to return to its position, and the lifting and conveying device 14 is raised and operated to convey the cigarette frame 16 out of the micro-pressure device 6 to complete high-precision boxing.

[0044] like Figure 2 and Figure 3As described above, in order to make the material evenly distributed in the cigarette frame 16, a criss-cross reciprocating feeding machine is used for feeding. The upper reciprocating feeding machine 3 and the lower reciprocating feeding machine 4 are arranged vertically and staggered in an up-down layout. The upper reciprocating feeding machine 3 conveys the material above it to the lower reciprocating feeding machine 4. The upper reciprocating feeding machine 3 reciprocates along the width direction of the lower reciprocating feeding machine 4, so that the material is fed to the cigarette frame 16 along the lower reciprocating feeding machine 4. The feeding width is consistent with the feeding size of the cigarette box in one direction. The lower reciprocating feeding machine 4 reciprocates along the length of the cigarette frame 16 in another direction, so that the material is evenly distributed in the cigarette frame.

[0045] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A high-precision raw cigarette pre-pressing and framing system, comprising: An upper reciprocating material distributor (3), a lower reciprocating material distributor (4), a smoke pressing device and a controller (18), wherein the upper reciprocating material distributor (3) is arranged above the lower reciprocating material distributor (4) to feed tobacco onto the lower reciprocating material distributor (4), and a smoke pressing device is provided on both sides of the lower reciprocating material distributor (4), the smoke pressing device comprising: a micro-pressure device (6), a static weighing device (7), a motor (8), a pressure head (9), a material storage hopper (11), a moving hopper (12), a moving hopper cylinder (13), a lifting device (14), a machine A material storage hopper (11) is fixed to the frame (17) on both sides of the lower reciprocating material distributor (4), a movable hopper (12) is mounted on the frame (17) under the material storage hopper (11) and is driven by a movable hopper cylinder (13) to move up and down along the material storage hopper (11), a static weigher (7) is mounted on the ground below the material storage hopper (11), a lifting device (14) is mounted on the static weigher (7), and a cigarette frame (6) is placed on the lifting device (14) and is connected to the movable hopper cylinder (13). The movable hopper (12) partially overlaps in height direction, the cigarette frame weighing support frame (19) is placed outside the lifting device (14), and its height is between the strokes of the lifting device (14). A micro-pressure device (6) is installed on the frame (17) above the storage hopper (11), and the micro-pressure device (6) is driven by a motor (8). The pressure head (9) is installed at the lower end of the micro-pressure device (6). The high-precision raw cigarette pre-pressing and framing system also includes: a feeding conveyor belt (1), a high-precision feeding device (5), a feeding hopper (10) and a storage conveyor. A feeding conveyor belt (15) is arranged on both sides of a storage hopper (11). One end of the feeding conveyor belt (1) feeds tobacco into the storage hopper (11) through the feeding hopper (10). The other end of the feeding conveyor belt (1) receives tobacco fed into the storage conveyor belt (15) through a high-precision feeding device (5). A controller (18) is respectively connected to the high-precision feeding device (5), a static weigher (7), a motor (8), a movable hopper cylinder (13), the storage conveyor belt (15) and a lifting device (14).

2. The high-precision raw cigarette pre-pressing and framing system according to claim 1, characterized in that: The tobacco fed into the upper reciprocating material distributor (3) and the two storage conveyor belts (15) is transported by the same tobacco transporting device, which comprises: a main conveyor belt (20), a first conveyor belt (21), a distribution conveyor belt (22), a bottom conveyor belt (23), a second conveyor belt (24) and a third conveyor belt (25). The main conveyor belt (20) feeds the tobacco into the first conveyor belt (21). The first conveyor belt (21) feeds the tobacco into the second conveyor belt (24) or one of the storage conveyor belts (15). The second conveyor belt (24) feeds the tobacco into the distribution conveyor belt (22). The distribution conveyor belt (22) feeds the tobacco into the upper reciprocating material distributor (3). The upper reciprocating material distributor (3) feeds the tobacco into the lower reciprocating material distributor (4) or the bottom conveyor belt (23). The bottom conveyor belt (23) feeds the tobacco into another storage conveyor belt (15) through the third conveyor belt (25).

3. The high-precision raw cigarette pre-pressing and framing system according to claim 2, characterized in that: A dynamic weigher (2) is installed on the distribution conveyor belt (22), and the dynamic weigher (2) is connected to the controller (18).

4. The high-precision raw cigarette pre-pressing and framing system according to claim 3, characterized in that: Photoelectric detectors are respectively installed at the feeding end, the middle section and the discharging section of the storage conveyor belt (15).

5. The high-precision raw cigarette pre-pressing and framing system according to claim 4, characterized in that: The lower layer reciprocating material distributor (4) is mounted on a frame (17) and is a reciprocating material distributor belt that moves back and forth between two material storage hoppers (11).

6. The high-precision raw cigarette pre-pressing and framing system according to claim 5, characterized in that: The upper reciprocating material distributor (3) is mounted on a frame (17) and is a reciprocating material distributor belt that moves back and forth between the lower reciprocating material distributor (4) and the bottom conveyor belt (23).

7. The high-precision raw cigarette pre-pressing and framing system according to claim 6, characterized in that: The high-precision feeding device (5) is a channel with a multi-head scale, each channel is loaded with tobacco of different weights, and according to the weight of the feeding, the channel loaded with tobacco of the relevant weight sends the tobacco therein into the feeding conveyor belt (1).

8. A method for pre-pressing and framing raw tobacco using the high-precision raw tobacco pre-pressing and framing system according to claim 7, characterized in that: It includes: (1) The smoke frame is in place After the smoke frame (16) is placed on the lifting device (14), the lifting device (14) rises, and at the same time, driven by the movable hopper cylinder (13), the movable hopper (12) descends into the smoke frame (16), and the smoke lower layer reciprocating feeder (4) is ready to feed one of the smoke frames (16); (II) Transportation of tobacco The tobacco is conveyed to the distribution conveyor belt (22) via the main conveyor belt (20) and the first conveyor belt (21). As the tobacco passes through the distribution conveyor belt (22), the dynamic weigher (2) dynamically and continuously weighs the weight of the tobacco. The tobacco is continuously fed into one of the storage hoppers (11) via the upper reciprocating feeder (3) and the lower reciprocating feeder (4). When the weight of the tobacco reaches a set weight, the dynamic weigher (2) sends a signal to the controller (18). The upper reciprocating feeder (3) and the lower reciprocating feeder (4) reverse direction after a delay period, complete the feeding of the above storage hopper (11), and prepare to feed another storage hopper (11). At the same time, the upper reciprocating feeder (3) or the first conveyor belt (21) reverses direction to feed the storage conveyor belt (15) for replenishing the tobacco pressing device that is about to perform compression. (III) Tobacco weighing and feeding The static weigher (7) weighs the tobacco in the cigarette frame (16) and transmits the weighing result to the controller (18). When the weight of the tobacco transmitted to the controller (18) does not reach the set value of the tobacco weight, the controller (18) starts the storage conveyor belt (15), the high-precision feeding device (5) and the feeding conveyor belt (1) to feed the feeding tobacco into the storage hopper (11). The static weigher (7) weighs the tobacco in the cigarette frame (16) at any time. When the weight of the tobacco transmitted to the controller (18) reaches the set value of the tobacco weight, the tobacco feeding ends. (IV) Compressed tobacco The lifting device (14) is lowered to the lowest position, the cigarette frame (16) is supported by the cigarette frame weighing support frame (19), the micro-pressure device (6) is driven by the motor (8), and the pressure head (9) is pressed downward into the cigarette frame (16) containing tobacco. After the pressure head (9) is pressed down to the right position, it stays for a period of time to maintain the pressure to prevent the tobacco from rebounding. After the pressure is maintained, the pressure head (9) is raised and the cigarette frame (16) is output; the original cigarette pre-pressing and framing is completed.

9. The method according to claim 8, characterized in that: The storage conveyor belt (15) runs at a low speed when storing materials so that tobacco is accumulated thereon. The storage conveyor belt (15) runs at a high speed when discharging materials so as to quickly feed the high-precision feeding device (5). In actual use, the measured weight of the dynamic weigher (2) is set to 99% of the weight of the tobacco to be loaded in the tobacco frame (16). Then, the weight of the tobacco loaded in the tobacco frame (16) is weighed by the static weigher (7). The difference between the set weight and the measured weight of the dynamic weigher (7) is supplemented by the storage conveyor belt (15), the high-precision feeding device (5) and the feeding conveyor belt (1).

10. The method according to claim 9, characterized in that: The delay time of the lower reciprocating material distributor (4) is the time required for the tobacco to be transported from the distribution conveyor belt (22) to the storage hopper (11); the delay time of the upper reciprocating material distributor (3) is the time required for the tobacco to be transported from the distribution conveyor belt (22) to the lower reciprocating material distributor (4).

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