Device and method capable of continuously collecting orthographic projection images of tobacco shreds

Abstract

The invention discloses a device and method capable of continuously collecting orthographic projection images of tobacco shreds. The device is composed of a rack, a panel, a stand column, a top plate, a rotating table, a universal ball, an industrial camera, an upper bearing, a lower bearing, a main shaft, a space cam, a rotating disc, a positive pressure mechanism, a discharging brush, a fixing base, a discharging opening, a bottom plate, a driving mechanism and a feeding conveying belt. And rising and pressing of the positive pressure mechanism are achieved through the space cam, and the purposes of conducting positive pressure flattening on the tobacco shreds on the rotary table and guaranteeing image collection of the tobacco shreds in the flattening state are achieved. When tobacco shred width detection is carried out through a machine vision technology subsequently, the size of the orthographic projection image of the tobacco shred can be close to the true value of the tobacco shred to the maximum extent, the influence of curled tobacco shred on the detection result is effectively solved, and the accuracy of tobacco shred width detection is greatly improved. According to the device, tobacco shreds can be continuously flattened, a plurality of tobacco shreds can be processed each time, and the collection efficiency of the orthographic projection images of the tobacco shreds is greatly improved.

Description

Technical Field

[0001] The present invention relates to a device and method for continuously capturing orthographic projection images of shredded tobacco, in particular to a device and method for continuously conveying shredded tobacco with irregular, discrete, and curled shapes, then controlling the posture of the shredded tobacco during the conveying process, and finally capturing images of the shredded tobacco using an industrial camera while maintaining the shape of the shredded tobacco, belonging to the technical field of tobacco equipment. Background Art

[0002] In the actual production process of cigarettes, tobacco leaves with different recipes, batches, moisture content and weather changes (temperature and humidity of the production environment) will produce different shred widths under the same shredding parameters. The shredding parameters set by the shredder cannot be uniformly applied, which greatly reduces the uniformity of tobacco shred width, is not conducive to the development of subsequent processes, and leads to the loss and waste of tobacco leaves, affecting the overall quality of cigarettes. In order to avoid such quality accidents and economic losses, when shredding tobacco leaves with different recipes, batches and moisture contents, tobacco factories currently generally use tobacco projectors to detect the shred width. Basically flat shreds are manually selected, magnified by the projector, and the inspection personnel read the readings against the scale. This is ensured by the system of intermittent manual sampling and offline testing. This operation method is too inefficient and cannot meet the production needs of the cigarette industry. Currently, there are many technologies for detecting tobacco width based on machine vision technology, such as a tobacco width detection method and device disclosed in CN115854878A, a tobacco width detection method, system, terminal and storage medium disclosed in CN113989355A, etc. These existing technologies all perform image acquisition when the tobacco is in a free state, and fail to control the posture of the tobacco. The acquired images are not "orthographic" images of the tobacco, resulting in low detection accuracy and failure to meet the overall needs of tobacco factories.

[0003] In short, when currently detecting tobacco width through machine vision technology, images of tobacco in a free state are often collected and measured without controlling the posture of the tobacco. In this way, the detected results will have a large error with the actual value, mainly because tobacco is curled in a free state, and the obtained image is not the "orthographic projection" image of the tobacco. Therefore, when detecting tobacco width, the posture of tobacco is an important factor affecting the detection results. In view of the shortcomings of low detection accuracy and detection efficiency of tobacco width detection in the current cigarette industry, the development of an efficient and accurate tobacco width detection technology is a key problem that needs to be solved urgently in the current tobacco industry technology field. Summary of the invention

[0004] In view of the problem that the "orthographic projection" image of tobacco cannot be collected during the tobacco width detection process in the current technical field of the cigarette industry, resulting in low efficiency and low detection accuracy, the present invention adopts automated technical means to achieve tobacco posture control and image acquisition. By controlling the posture of tobacco, a device and method for morphological control of curled tobacco is realized, which enables an industrial camera to collect the "orthographic projection" image of tobacco, thereby achieving the purpose of improving the accuracy of tobacco width detection, overall detection efficiency and automation level.

[0005] The technical solution adopted by the present invention is:

[0006] A device capable of continuously collecting orthographic projection images of tobacco shreds, the device mainly comprises a frame, a panel, a column, a top plate, a light source, a rotating table, a universal ball, an industrial camera, an upper bearing, a lower bearing, a main shaft, a space cam, a turntable, a positive pressure mechanism, a discharging brush, a fixing seat, a discharging port, a bottom plate, a driving mechanism and a feeding conveyor belt. The panel is fixed on the top of the frame, connected and fixed to the top plate through the columns; the bottom plate is fixed to the lower end of the frame; the industrial camera is fixed on the top plate, and the tobacco can be imaged through the industrial camera; the lower end of the main shaft is fixed to the panel through the lower bearing, and the upper end is fixed to the top plate through the upper bearing, and the main shaft can rotate freely under the action of the upper bearing and the lower bearing; the space cam is fixed to the top plate, and the upward and downward pressure functions of the positive pressure mechanism can be realized through the space cam; the turntable is fixed on the main shaft and placed between the cam and the panel, and the turntable can rotate with the main shaft and can be used to position the positive pressure mechanism to ensure the lifting and lowering of the positive pressure mechanism; the rotating table is fixed on the main shaft and can also rotate with the main shaft, and can be used to transport tobacco that needs to be imaged through the rotating table; the universal ball is evenly fixed on the panel and in contact with the rotating table, and the rotating table can be provided with corresponding support by the universal ball when it rotates with the main shaft; the upper end of the positive pressure mechanism is embedded in the groove of the space cam , and is positioned by a turntable, can move circumferentially with the turntable, and can be lifted and pressed down under the action of a space cam during the movement, mainly with a maximum lifting position and a maximum pressing position; the light source is fixed on the panel and placed between the industrial camera and the maximum pressing position of the positive pressure mechanism, and can provide lighting when the industrial camera collects tobacco images; the fixed seat is arranged on the panel, and the discharge brush is positioned by the fixed seat, and is placed at the position where the positive pressure mechanism moves from the maximum pressing position to the maximum lifting position, and can be used to clean the tobacco on the rotating table after image acquisition is completed and leave the rotating table; the discharge port is arranged at the lower end of the panel, and the tobacco cleaned by the discharge brush can automatically leave the system through the discharge port; the driving mechanism is arranged on the bottom plate, and the driving mechanism can provide driving force for the main shaft and the discharge brush; the feed conveyor belt is arranged on the panel and placed at the maximum lifting position of the positive pressure mechanism, and can be used to transport the tobacco to be imaged to the rotating table.

[0007] Further preferably, the positive pressure mechanism also includes a bow rod, a cam bearing, a fixed plate, a spring shaft, a spring, and a transparent pressure plate. The cam bearing is fixed to the upper end of the bow rod and embedded in the cam motion groove of the space cam; the bow rod passes through the turntable for positioning, and the turntable can make the cam bearing move in the groove of the space cam during the rotation process, so that the bow rod can rise and press down; the fixed plate is fixed to the other end of the bow rod; the spring shaft passes through the fixed plate to connect with the transparent pressure plate, and the spring is sleeved on the spring shaft and arranged between the transparent pressure plate and the fixed plate; when the bow rod is pressed down to the maximum pressing position, the transparent pressure plate can contact the rotating table and flatten the tobacco on the rotating table, and the tobacco and the transparent pressure plate are protected by the compression of the spring; the industrial camera can collect the positive projection image of the flattened tobacco through the transparent pressure plate.

[0008] Further preferably, the driving mechanism also includes a reduction motor, a first driving wheel, a first passive wheel, a first synchronous belt, a second driving wheel, a second passive wheel, and a second synchronous belt. The reduction motor is fixed on the bottom plate, the first driving wheel is arranged at the power output end of the reduction motor, the first passive wheel is arranged at the bottom end of the main shaft, the first driving wheel and the first passive wheel are connected through the first synchronous belt, and the circumferential rotation of the main shaft can be realized through the power supply of the reduction motor; the second driving wheel is arranged on the main shaft and placed above the first passive wheel, the second passive wheel is arranged at the lower end of the discharge brush, and the second driving wheel and the second passive wheel are connected through the second synchronous belt; the main shaft can drive the discharge brush to rotate while rotating, thereby realizing the cleaning and discharge action of the tobacco.

[0009] Further preferably, there are four groups of positive pressure mechanisms. When the system is in operation, the four groups of positive pressure mechanisms continuously rise and fall to flatten the tobacco on the rotating table with positive pressure, and ensure that the tobacco is flattened and the orthographic projection image of the tobacco is captured by an industrial camera.

[0010] The present invention utilizes the above-mentioned device capable of continuously acquiring orthographic projection images of shredded tobacco to implement a method for acquiring orthographic projection images of shredded tobacco as follows:

[0011] At the beginning of S1, the system starts to work and places multiple target tobaccos independently and discretely on the feed belt;

[0012] S2 conveys the tobacco to the rotating table through the feeding belt;

[0013] S3 is driven by the reduction motor. The rotating table, turntable and discharging brush will move circumferentially with the main shaft under the drive of the main shaft. The tobacco shreds move circumferentially from the maximum rising position of the positive pressure mechanism to the maximum pressing position on the rotating table. The positive pressure mechanism also moves from the maximum rising position to the maximum pressing position.

[0014] When the S4 tobacco reaches the maximum downward pressure position of the positive pressure mechanism, the positive pressure mechanism also just drops to the maximum downward pressure position, and under the protection of the spring, the tobacco can be flattened on the rotating table through the transparent pressing plate;

[0015] S5 The tobacco continues to move in a circumferential direction under the maintenance of the transparent pressing plate and the rotating table. The tobacco is captured by an industrial camera while being kept flat. The orthographic projection image of the tobacco in the flattened state can be captured. The captured orthographic projection image of the tobacco can be transmitted to a computer through the industrial camera.

[0016] After the orthographic projection image of the tobacco is acquired, the tobacco continues to move forward along the rotating table, and the positive pressure mechanism also starts to move from the maximum downward pressure position to the maximum upward pressure position. After the positive pressure mechanism leaves the rotating table for a certain distance, the tobacco that has completed the image acquisition is cleaned off the rotating table by the discharge brush, and flows out from the discharge port and is recovered;

[0017] There are four groups of S7 positive pressure mechanisms in total. According to the steps of S1 to S6, the tobacco shreds can be automatically flattened continuously and then the positive projection image can be collected.

[0018] Working principle of the present invention:

[0019] A device and method for continuously collecting orthographic projection images of tobacco shreds, comprising a frame, a panel, a column, a top plate, a light source, a rotating table, a universal ball, an industrial camera, an upper bearing, a lower bearing, a main shaft, a space cam, a turntable, a positive pressure mechanism, a discharging brush, a fixed seat, a discharging port, a bottom plate, a driving mechanism and a feeding conveyor belt. The positive pressure mechanism also includes a bow rod, a cam bearing, a fixed plate, a spring shaft, a spring, and a transparent pressure plate. The driving mechanism also includes a reduction motor, a first driving wheel, a first passive wheel, a first synchronous belt, a second driving wheel, a second passive wheel, and a second synchronous belt. The frame is the main supporting structure; the panel and the top plate are connected by columns; the industrial camera fixed on the top plate is used to collect and transmit images of tobacco; the light source fixed on the panel is used to provide lighting for the industrial camera to collect images of tobacco; the main shaft is fixed by upper and lower bearings, and can move circumferentially under the drive of the driving mechanism; the rotating table fixed on the main shaft and able to move circumferentially with the main shaft is used to transport tobacco; the universal ball mainly supports the rotating table; the space cam fixed on the top plate is the core moving component of the present invention, and the positive pressure mechanism can be positioned by the turntable so that the positive pressure mechanism can move axially under the action of the space cam to achieve downward and upward pressure; the positive pressure mechanism is combined with a fixed plate, a spring shaft, a spring and a transparent pressure plate to achieve flexible flattening of tobacco and protection. The discharging brush can clean the tobacco after image acquisition and leave it from the rotating table and recycle the tobacco from the discharging port; the power of the main shaft in the device is supplied by the first active wheel, the first passive wheel and the first synchronous belt in the driving mechanism; the turntable and the rotating table can move circumferentially with the main shaft through the drive of the reduction motor, and at the same time, the positive pressure mechanism is driven to move circumferentially under the action of the turntable, and under the action of the space cam, the positive pressure mechanism can rise and press down at the same time during the circumferential movement, thereby achieving the purpose of flattening and releasing the tobacco; the power of the discharging brush is supplied by the second active wheel, the second passive wheel and the second synchronous belt in the driving mechanism, and the main shaft can also drive the discharging brush to rotate while rotating circumferentially, thereby realizing the discharging and cleaning function of the tobacco.

[0020] When the device is used to collect the orthographic projection image of tobacco. First, the system starts working and places multiple target tobaccos independently and discretely on the feed belt; the tobaccos are transported to the rotating table by the feed belt, and the positive pressure mechanism is at the maximum rising position at this time; secondly, as the reduction motor drives the main shaft to rotate, the tobaccos that fall on the rotating table will move circumferentially from the maximum rising position of the positive pressure mechanism to the maximum pressing position with the rotating table. During the movement, the positive pressure mechanism also moves from the maximum rising position to the maximum pressing position with the turntable, and at the same time, under the action of the space cam, the positive pressure mechanism can be pressed down; when the tobacco reaches the maximum pressing position of the positive pressure mechanism, the positive pressure mechanism also just drops to the maximum pressing position, and under the protection of the spring, the tobacco can be flattened on the rotating table through the transparent pressing plate; then, the tobacco continues to be maintained by the transparent pressing plate and the rotating table. Continue to move in a circumferential direction, and while passing through the light source, the light source provides lighting for image acquisition, and the tobacco is kept in a flattened state. The image of the tobacco is acquired by an industrial camera, and the acquired tobacco image is transmitted to the computer. At this time, the image acquired by the industrial camera is the positive projection image of the tobacco in the flattened state; finally, after completing the tobacco image acquisition, the tobacco continues to move forward in a circumferential direction with the rotating table, and the positive pressure mechanism also begins to move from the maximum downward pressure station to the maximum upward position and leave the rotating table. After the positive pressure mechanism leaves the rotating table for a certain distance, the tobacco that has completed the image acquisition is cleaned away from the rotating table by a discharging brush, and flows out from the discharging port and is recovered; in the present invention, a total of four groups of positive pressure mechanisms are arranged, and the aforementioned steps can continuously and automatically flatten the tobacco and perform positive projection image acquisition.

[0021] The beneficial effects of the present invention include:

[0022] Ⅰ. The space cam is used in conjunction with the positive pressure mechanism to automatically flatten the tobacco, keep the tobacco in the flattened state, and ensure that the tobacco is imaged in the flattened state, so that the industrial camera captures the positive projection image of the tobacco during image acquisition. When the tobacco width is subsequently detected by machine vision technology, the influence of the curling of the tobacco on the tobacco width detection value is greatly reduced, greatly improving the accuracy of tobacco width detection;

[0023] Ⅱ. The tobacco can be continuously flattened through four sets of positive pressure mechanisms, and multiple tobacco can be processed each time.

[0024] The efficiency of tobacco orthographic projection image acquisition has been greatly improved.

[0025] III. The structure is flexible and light. The positive pressure mechanism can flexibly flatten the tobacco through the buffering effect of the spring, effectively protecting the tobacco and the positive pressure mechanism, greatly improving the safety of the device. At the same time, the tobacco after testing can be returned to the production line through the discharge port to enter the next process, without wasting the tobacco. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an axial structural diagram of the present invention;

[0027] Figure 2 It is a main structural diagram of the present invention;

[0028] Figure 3 It is a side structural diagram of the present invention;

[0029] Figure 4 It is a schematic diagram of the positive pressure mechanism of the present invention;

[0030] Figure 5 It is a schematic diagram of the driving mechanism of the present invention;

[0031] Figure 6 This is a flow chart of a method for continuously collecting orthographic projection images of shredded tobacco according to the present invention;

[0032] Among them: 1-frame; 2-panel; 3-column; 4-top plate; 5-light source; 6-rotating table; 7-universal ball; 8-industrial camera; 9-upper bearing; 10-lower bearing; 11-spindle; 12-space cam; 13-turntable; 14-positive pressure mechanism; 1401-bow rod; 1402; cam bearing; 1403-fixed plate; 1404-spring shaft; 1405-spring; 1406-transparent pressure plate; 15-discharging brush; 16-fixed seat; 17-discharging port; 18-bottom plate; 19-transmission structure; 1901-reduction motor; 190-2 first driving wheel; 1903-first passive wheel; 1904-first synchronous belt; 1905-second driving wheel; 1906-second passive wheel; 1907-second synchronous belt; 20-feed conveyor belt. DETAILED DESCRIPTION

[0033] The following is a further explanation of the process of realizing automatic flattening of tobacco and collecting the orthographic projection image of tobacco in the present invention in conjunction with the accompanying drawings. The following embodiments further describe the present invention on the basis of the content of the present invention, which are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0034] Example 1

[0035] A device and method for continuously capturing orthographic projection images of tobacco shreds can realize automatic and continuous positive pressure flattening of curled tobacco shreds, and ensure that the tobacco shreds are imaged by an industrial camera in a flattened state, so that the image captured by the industrial camera is an orthographic projection image of the tobacco shreds. The subsequent width detection of tobacco shreds by machine vision can greatly improve the accuracy and work efficiency of width detection. The purpose of high efficiency in capturing orthographic projection images of tobacco shreds and improving the accuracy of tobacco shred width detection can be achieved. The overall structural diagram of the device is shown in the figure below. Figure 1 , Figure 2 and Figure 3 As shown, it is mainly equipped with a frame 1, a panel 2, a column 3, a top plate 4, a light source 5, a rotating table 6, a universal ball 7, an industrial camera 8, an upper bearing 9, a lower bearing 10, a main shaft 11, a space cam 12, a turntable 13, a positive pressure mechanism 14, a discharge brush 15, a fixed seat 16, a discharge port 17, a bottom plate 18, a driving mechanism 19 and a feed conveyor belt 20. The panel 2 is fixed on the top of the frame 1, and is connected and fixed to the top plate 4 through the column 3; the bottom plate 18 is fixed to the lower end of the frame 1; the industrial camera 8 is fixed on the top plate 4, and can collect images of tobacco; the main shaft 11 is fixed to the panel 2 and the top plate 4 through the upper bearing 9 and the lower bearing 10; the space cam 12 is fixed to the top plate 4; the turntable 13 is fixed to the main shaft 11 and is placed between the space cam 12 and the panel 2 and can rotate with the main shaft 11; the rotating table 6 is fixed to the main shaft 11 and can also rotate with the main shaft 11, and the tobacco that needs to be collected can be transported through the rotating table 6; the universal ball 7 is evenly fixed on the panel 2 and contacts the rotating table 6, and the rotating table 6 can be provided with corresponding support by the universal ball 7 when rotating with the main shaft 11; the positive pressure mechanism 14 is as shown Figure 4As shown, it is composed of a bow rod 1401, a cam bearing 1402, a fixing plate 1403, a spring shaft 1404, a spring 1405 and a transparent pressure plate 1406. The cam bearing 1402 is fixed to the upper end of the bow rod 1401 and embedded in the groove of the space cam 12; the bow rod 1401 passes through the turntable 13 for positioning, and the turntable 13 can make the cam bearing 1402 move up and down in the groove of the space cam 12 in the process of rotation. Under the action of the space cam 12, the positive pressure mechanism 14 can be raised and pressed down, and can reach the two extreme positions of the maximum rising position and the maximum pressing position; the fixed plate 1403 is fixed to the other end of the bow rod 1401; the spring shaft 1404 passes through the fixed plate 1403 and is connected to the transparent pressing plate 1406, and the spring 1405 is sleeved on the spring shaft 1404 and arranged between the transparent pressing plate 1406 and the fixed plate 1403; when the bow rod 1401 is pressed down to the maximum pressing position, the transparent pressing plate 1406 can contact the rotating table 6 and flatten the tobacco on the rotating table 6, and the pressure of the spring 1405 The shrinking function can protect the tobacco and the transparent pressing plate 1406; the light source 5 is fixed on the panel 2 and is placed between the industrial camera 8 and the maximum downward pressing position of the positive pressure mechanism 14, which can provide lighting for the industrial camera 8 when collecting tobacco images; the industrial camera 8 can collect the positive projection image of the flattened tobacco through the transparent pressing plate 1406; there are four groups of positive pressure mechanisms 14 along the direction of tobacco movement. During the operation of the device, the four groups of positive pressure mechanisms 14 continuously move up and down, continuously flattening the tobacco on the rotating table 6 with positive pressure, and ensuring that the tobacco is flattened. The positive projection image of the tobacco is collected by the industrial camera 8; the discharge brush 15 is positioned by the fixed seat 16 and set on the panel 2, and is placed at the position where the positive pressure mechanism 14 moves from the maximum downward pressing position to the maximum rising position. The tobacco on the rotating table 6 that has completed image collection can be cleaned and automatically leave the device from the discharge port 17; the driving mechanism 19 is as shown Figure 5As shown, it consists of a reduction motor 1901, a first driving wheel 1902, a first driven wheel 1903, a first synchronous belt 1904, a second driving wheel 1905, a second driven wheel 1906 and a second synchronous belt 1907. The reduction motor 1901 is fixed on the bottom plate 18, the first driving wheel 1902 is arranged at the power output end of the reduction motor 1901, the first driven wheel 1903 is arranged at the bottom end of the main shaft 11, the first driving wheel 1902 and the first driven wheel 1903 are connected through the first synchronous belt 1904, and the circumferential rotation of the main shaft 11 can be realized through the power supply of the reduction motor 1901; the second driving wheel 1905 is arranged on the main shaft 11 and placed above the first driven wheel 1903, and the second driven wheel 1906 is arranged on the second driven wheel 1906. Wheel 1906 is arranged at the lower end of the discharge brush 15, and is connected to the second active wheel 1905 and the second passive wheel 1906 through the second synchronous belt 1907; the main shaft 11 can drive the discharge brush 15 to rotate while rotating, thereby realizing the cleaning and discharge action of the tobacco; the driving mechanism 19 can provide driving force for the main shaft 11 and the discharge brush 15; the feed conveyor belt 20 is arranged on the panel 2 and is placed at the maximum rising position of the positive pressure mechanism 14, so that the tobacco to be imaged can be conveyed to the rotating table 6.

[0036] Example 2

[0037] See also Figure 6 As shown, a method for continuously collecting tobacco shreds orthographic projection images is described, and the specific implementation steps are as follows:

[0038] ① At the beginning, the system starts to work and places multiple target tobacco shreds independently and discretely on the feed conveyor belt 20;

[0039] ② The tobacco is transported to the rotating table 6 by the feed conveyor belt 20;

[0040] ③ Under the power drive of the reduction motor 1901, the rotating table 6, the rotating disk 13 and the discharging brush 15 move circumferentially with the main shaft 11, and the tobacco shreds move circumferentially from the maximum rising position of the positive pressure mechanism 14 to the maximum pressing position on the rotating table 6, and the positive pressure mechanism 14 also moves from the maximum rising position to the maximum pressing position;

[0041] ④ When the tobacco reaches the maximum downward pressing position of the positive pressure mechanism 14, the positive pressure mechanism 14 also just drops to the maximum downward pressing position, and under the protection of the spring 1405, the tobacco can be flattened on the rotating table 6 through the transparent pressing plate 1406;

[0042] ⑤ The tobacco shreds continue to move in a circumferential direction under the maintenance of the transparent pressing plate 1406 and the rotating table 6. During the movement, the tobacco shreds are imaged by the industrial camera 8, and an orthographic projection image of the tobacco shreds can be acquired. The acquired orthographic projection image of the tobacco shreds can be transmitted to a computer through the industrial camera 8;

[0043] ⑥ After the orthographic projection image of the tobacco is collected, the tobacco continues to move forward along the rotating table 6, and the positive pressure mechanism 14 also starts to move from the maximum downward pressure position to the maximum upward position. After the positive pressure mechanism 14 leaves the rotating table 6 for a certain distance, the tobacco that has completed the image collection is cleaned away from the rotating table 6 by the discharge brush 15, and flows out from the discharge port 17 and is recovered;

[0044] ⑦ There are four positive pressure mechanisms 14 in total. According to steps S1 to S6, the tobacco shreds can be automatically flattened continuously and then the positive projection image can be collected.

Claims

1. A device capable of continuously collecting orthographic projection images of tobacco shreds, characterized in that: The device comprises a frame (1), a panel (2), a column (3), a top plate (4), a rotating table (6), a universal ball (7), an upper bearing (9), a lower bearing (10), a main shaft (11), a space cam (12), a turntable (13), a positive pressure mechanism (14) and a driving mechanism (19); wherein: The panel (2) is fixed on the top of the frame (1), and is connected and fixed to the top plate (4) through the column (3); the main shaft (11) is fixed to the panel (2) and the top plate (4) through the upper bearing (9) and the lower bearing (10); the space cam (12) is fixed to the top plate (4); the turntable (13) is fixed to the main shaft (11) and is placed between the space cam (12) and the panel (2), and can rotate together with the main shaft (11); the rotating table (6) is fixed to the main shaft (11) and can rotate together with the main shaft (11), and the tobacco shreds whose images need to be collected are transported through the rotating table (6); the universal ball (7) is evenly fixed on the panel (2) and is in contact with the rotating table (6), and the universal ball (7) can provide corresponding support to the rotating table (6) when the rotating table (6) rotates with the main shaft (11); The driving mechanism (19) is connected to and drives the main shaft (11) to rotate; The positive pressure mechanism (14) comprises a bow rod (1401), a cam bearing (1402), a fixing plate (1403) and a transparent pressing plate (1406); the cam bearing (1402) is fixed to the upper end of the bow rod (1401) and embedded in the groove of the space cam (12); the bow rod (1401) passes through the rotating disk (13) for positioning, and the rotating disk (13) causes the cam bearing (1402) to move in a curved line in the groove of the space cam (12) in an up-and-down manner along the groove during rotation. , under the action of the space cam (12), the positive pressure mechanism (14) is lifted and pressed down; the fixed plate (1403) is fixed to the other end of the bow rod (1401); the fixed plate (1403) is connected to the transparent pressing plate (1406); when the bow rod (1401) is pressed down to the maximum pressing position, the transparent pressing plate (1406) can contact the rotating table (6) and flatten the tobacco on the rotating table (6), and the flattened tobacco is used by the image acquisition device to capture its positive projection image.

2. The device according to claim 1, characterized in that: It also includes a discharging brush (15), a fixing seat (16) and a discharging port (17); The discharge brush (15) is positioned by a fixing seat (16) and arranged on the panel (2), and is placed at a position where the positive pressure mechanism (41) moves from a maximum downward pressure position to a maximum upward pressure position. The main shaft (11) drives the discharge brush (15) to rotate while rotating. The discharge brush (15) rotates to clean the tobacco on the rotating table (6) and allow the tobacco to leave from the discharge port (17).

3. The device according to claim 1, characterized in that: Also includes a feed conveyor belt (20); The feed conveyor belt (20) is arranged on the panel (2) and placed at the maximum rising position of the positive pressure mechanism (14), and is used to convey the tobacco shreds to be imaged to the rotating table (6).

4. The device according to claim 2, characterized in that: It also includes a bottom plate (18) fixed to the lower end of the frame (1); The driving mechanism (19) further comprises a reduction motor (1901), a first driving wheel (1902), a first driven wheel (1903), a first synchronous belt (1904), a second driving wheel (1905), a second driven wheel (1906) and a second synchronous belt (1907); wherein: The reduction motor (1901) is fixed on the bottom plate (18); the first driving wheel (1902) is arranged at the power output end of the reduction motor (1901); the first passive wheel (1903) is arranged at the bottom end of the main shaft (11); the first driving wheel (1902) and the first passive wheel (1903) are connected by a first synchronous belt (1904); the circumferential rotation of the main shaft (11) is realized by the power supply of the reduction motor (1901); the second driving wheel (1905) is arranged on the main shaft (11) and is placed above the first passive wheel (1903); the second passive wheel (1906) is arranged at the lower end of the discharge brush (15); the second driving wheel (1905) and the second passive wheel (1906) are connected by a second synchronous belt (1907).

5. The device according to claim 1, characterized in that: It also includes an industrial camera (8), which is located above the transparent pressing plate (1406) and fixed on the top plate (4) and is used to collect the positive projection image of the flattened tobacco.

6. The device according to claim 1, characterized in that: The positive pressure mechanisms (14) are provided with four groups in total along the traveling direction of the tobacco shreds. The four groups of positive pressure mechanisms (14) continuously move up and down to continuously apply positive pressure to flatten the tobacco shreds on the rotating platform (6).

7. The device according to any one of claims 1 to 6, characterized in that: Also includes a spring shaft (1404) and a spring (1405); The spring shaft (1404) passes through the fixed plate (1403) and is connected to the transparent pressing plate (1406); the spring (1405) is sleeved on the spring shaft (1404) and is arranged between the transparent pressing plate (1406) and the fixed plate (1403); the spring (1405) is used to protect the tobacco and the transparent pressing plate (1406).

8. A method for continuously capturing orthographic projection images of tobacco shreds according to the device capable of continuously capturing orthographic projection images of tobacco shreds according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, at the beginning, the system starts to work, and a plurality of target tobacco shreds are placed independently and discretely on the feed conveyor belt (20); S2, conveying the tobacco shreds to the rotating table (6) through the feeding conveyor belt (20); S3, driven by the power of the reduction motor (1901), the rotating table (6), the rotating disk (13) and the discharging brush (15) move circumferentially along with the main shaft (11), and the tobacco shreds move circumferentially from the maximum rising position of the positive pressure mechanism (14) to the maximum pressing position on the rotating table (6), and the positive pressure mechanism (14) also moves from the maximum rising position to the maximum pressing position; S4, when the tobacco reaches the maximum downward pressure position of the positive pressure mechanism (14), the positive pressure mechanism (14) also just drops to the maximum downward pressure position, and under the protection of the spring (1405), the tobacco is flattened on the rotating table (6) through the transparent pressing plate (1406); S5, the tobacco shreds continue to move in a circumferential direction while being held by the transparent pressing plate (1406) and the rotating table (6). During the movement, the tobacco shreds are imaged by the industrial camera (8), so that an orthographic projection image of the tobacco shreds can be acquired. The acquired orthographic projection image of the tobacco shreds can be transmitted to a computer by the industrial camera (8); S6, after the orthographic projection image of the tobacco is acquired, the tobacco continues to move forward in a circumferential direction along with the rotating table (6), and the positive pressure mechanism (14) also starts to move from the maximum downward pressure position to the maximum upward pressure position. After the positive pressure mechanism (14) leaves the rotating table (6) for a certain distance, the tobacco for which the image acquisition has been completed is cleaned away from the rotating table (6) by the discharge brush (15), and flows out from the discharge port (17) and is recovered; S7, according to the steps of S1 to S6, the tobacco shreds are automatically flattened continuously and then the orthographic projection images are collected.

Images