A device and method for measuring cigarette packages and a method for locating cigarette packages

Abstract

The present invention provides a device for measuring cigarette packs, which is used to measure cigarette packs transmitted on a conveyor belt. The device includes: a first grating, which is arranged above the conveyor belt along the transmission direction of the cigarette pack, and includes N light beams, N≥1; an encoder, which is arranged on the motor shaft of the conveyor belt, and is used to measure the rotation angle of the motor shaft after each light beam blocked by the cigarette pack; wherein, when the cigarette pack runs to the first grating, the first pulse number of each light beam blocked by the cigarette pack in the encoder is obtained; when the cigarette pack leaves the first grating, the second pulse number of each light beam blocked by the cigarette pack in the encoder is obtained. A method for measuring cigarette packs and a method for locating cigarette packs are also provided, which can effectively improve the accuracy of measuring cigarette packs.

Description

Technical Field

[0001] The present invention relates to a cigarette pack measuring process, and in particular to a device and method for measuring a cigarette pack and a method for locating a cigarette pack. Background Art

[0002] The tobacco industry often uses the "three knives and four slices" silk-making process to slice cigarette packs. Specifically, the photoelectric positioning barcode ranging method is used to locate and slice the cigarette packs. The factors affecting the accuracy of this positioning and slicing method mainly include: 1) Measurement: There is a scanner on the upper end of the push plate. The scanner will scan the barcode in real time to read the length of the cigarette pack. Since the scanner is bound to the push plate, the scanner will be skewed during long-term use, resulting in inaccurate measurement of the length of the cigarette pack; 2) Positioning: Since the positioning of the cigarette pack adopts photoelectric positioning, when the cigarette pack is pushed to the photoelectric potential by the push plate, the photoelectric will transmit a stop signal to the motor, so that the motor will stop. During this process, the motor will continue to push the cigarette pack for a distance due to inertia, causing the horizontal barcode distance between the positioning photoelectric and the push plate to be smaller than the actual length of the cigarette pack, resulting in inaccurate positioning of the cigarette pack. Summary of the invention

[0003] The problem solved by the present invention is how to improve the accuracy of measuring cigarette packages. The present invention provides a device and method for measuring cigarette packages and a method for locating cigarette packages, which can effectively improve the accuracy of measuring cigarette packages.

[0004] In order to solve the above problems, an embodiment of the present invention discloses a device for measuring cigarette packets, which is used to measure cigarette packets transmitted on a conveyor belt, and the device includes: a first grating, which is arranged above the conveyor belt along the transmission direction of the cigarette packets, and includes N light beams, N≥1; an encoder, which is arranged on the motor shaft of the conveyor belt, and is used to measure the rotation angle of the motor shaft after each light beam is blocked by the cigarette packet; wherein, when the cigarette packet runs to the first grating, the first pulse number of each light beam blocked by the cigarette packet in the encoder is obtained; when the cigarette packet leaves the first grating, the second pulse number of each light beam blocked by the cigarette packet in the encoder is obtained.

[0005] By adopting the above technical solution, the accuracy of measuring cigarette packages can be improved.

[0006] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a device for measuring cigarette packs, which also includes: a second grating, which is arranged in front of the first grating along the conveying direction of the cigarette pack; a push plate, which is arranged between the first grating and the second grating, and the push plate is driven by a servo motor to push the cigarette pack to move along the conveying direction.

[0007] By adopting the above technical solution, the length of the cigarette pack is calculated by recording the number of encoder pulses before and after the cigarette pack blocks the first grating, and when the cigarette pack touches the second grating, a signal is sent to the servo motor to make the push plate continue to push a certain distance, effectively avoiding the inertial push of the motor and realizing precise positioning of the cigarette pack.

[0008] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a device for measuring cigarette packs, which also includes: a third grating, which is arranged in front of the second grating along the conveying direction of the cigarette packs; and a cutter, which is arranged in front of the third grating along the conveying direction of the cigarette packs, for slicing the cigarette packs.

[0009] By adopting the above technical solution, through the precise positioning of the cigarette pack and combining it with the third grating, the slice size can be accurately calculated, and the cutter can be used to achieve accurate slicing of the cigarette pack.

[0010] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a device for measuring cigarette packets, wherein along the conveying direction of the cigarette packets, the distance between the second grating and the third grating is a first distance, and the distance between the third grating and the cutter is a second distance.

[0011] By adopting the above technical solution, the first distance and the second distance can be fixed lengths, which is convenient for calculating the slice size.

[0012] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a device for measuring cigarette packs, wherein the encoder is an absolute value encoder.

[0013] By adopting the above technical solution, the accuracy of the encoder can be selected according to needs, and the grating and encoder with corresponding accuracy can be selected according to different accuracy requirements.

[0014] An embodiment of the present invention also discloses a method for measuring a cigarette pack, the method comprising: using the above-mentioned device to obtain the first pulse number in the encoder of each light beam blocked by the cigarette pack when the cigarette pack runs to the first grating; obtaining the second pulse number in the encoder of each light beam blocked by the cigarette pack when the cigarette pack leaves the first grating; and calculating the length of the cigarette pack based on the rotation angle of the motor shaft of the conveyor belt between the first pulse number and the second pulse number of each light beam.

[0015] By adopting the above technical scheme, the distance that the light beam runs on the conveyor belt at the height position of the cigarette pack is obtained according to the rotation angle of the motor shaft between the first pulse number and the second pulse number recorded by the encoder. The distance that all light beams blocked by the cigarette pack run on the conveyor belt at the height position of the cigarette pack can be obtained, thereby calculating the length of the cigarette pack and improving the measurement accuracy.

[0016] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a method for measuring a cigarette pack, in the step of calculating the length of the cigarette pack according to the rotation angle of the motor shaft of the conveyor belt between the first pulse number and the second pulse number of each light beam, comprising: obtaining at least one set of length data according to the rotation angle of the motor shaft of the conveyor belt between the first pulse number and the second pulse number of each light beam; calculating the average value of at least one set of length data to obtain the length of the cigarette pack.

[0017] By adopting the above technical scheme, when the cigarette pack blocks the front and back of the first grating, since the cigarette pack has a certain height, the first pulse number and the second pulse number of the multiple light beams blocked by the cigarette pack can be obtained. According to the first pulse number and the second pulse number of the light beam, the group of length data of the light beam corresponding to the height position of the cigarette pack is calculated, and the average value of the multiple groups of length data is taken to obtain the length of the cigarette pack.

[0018] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a method for measuring cigarette packs, which, in the step of calculating the average value of at least one set of length data, includes: eliminating interference data in at least one set of length data to obtain correct data in at least one set of length data; and calculating the average value of at least one set of length data based on the correct data in at least one set of length data.

[0019] By adopting the above technical solution, before calculating the average value of the length data, the interference data in the length data is eliminated to eliminate the interference data and improve the accuracy of the calculation.

[0020] An embodiment of the present invention also discloses a method for locating a cigarette pack, the method comprising: using the above-mentioned device to obtain a signal when the cigarette pack runs to the second grating; based on the signal, a push plate pushes the cigarette pack to run a third distance; based on the length of the cigarette pack, the distance between the second grating and the cutter, and the third distance, obtaining the position data of the cigarette pack.

[0021] By adopting the above technical solution, when the cigarette pack touches the second grating, a signal is sent to the servo motor so that the push plate continues to push the third distance, which effectively avoids the inertial push of the motor and realizes the precise positioning of the cigarette pack.

[0022] According to another specific embodiment of the present invention, a method for locating a cigarette pack disclosed in an embodiment of the present invention further includes: according to a signal, a push plate pushes the cigarette pack to run to a third grating; and according to the length of the cigarette pack, the distance between the second grating and the third grating, and the distance between the third grating and the cutter, obtaining the position data of the cigarette pack.

[0023] By adopting the above technical solution, when the cigarette pack touches the second grating, a signal is sent to the servo motor so that the push plate continues to push the cigarette pack to move. If the cigarette pack moves to the third grating, the cigarette pack can be accurately positioned based on the length of the cigarette pack, the distance between the second grating and the third grating, and the distance between the third grating and the cutter.

[0024] According to another specific embodiment of the present invention, a method for locating a cigarette pack disclosed in an embodiment of the present invention further includes: slicing the cigarette pack according to the position data of the cigarette pack.

[0025] By adopting the above technical solution, the slicing position of the cigarette pack is determined according to the position data of the cigarette pack, so as to achieve accurate slicing of the cigarette pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a device for measuring cigarette packs provided by an embodiment of the present invention Figure 1 ;

[0027] Figure 2 A schematic diagram of a device for measuring cigarette packs provided by another embodiment of the present invention Figure 2 ;

[0028] Figure 3 is a schematic diagram of N groups of length data of N light beams in a device for measuring cigarette packets provided by an embodiment of the present invention;

[0029] Figure 4 is a flow chart of a method for measuring cigarette packs provided by an embodiment of the present invention;

[0030] Figure 5 It is a flow chart of a method for locating cigarette packages provided by an embodiment of the present invention.

[0031] The above drawings include the following reference numerals:

[0032] 1 conveyor belt; 2 cigarette pack; 3 first grating; 4 second grating; 5 push plate; 6 third grating; 7 cutter; S1 first distance; S2 second distance; X conveying direction of cigarette pack. DETAILED DESCRIPTION

[0033] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0034] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0035] In the description of this embodiment, it should be noted that the terms "upper", "front", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the inventive product is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] In the present invention, "front" refers to the previous position along the conveying direction of the cigarette pack.

[0038] The following is combined with Figure 1 A device for measuring cigarette packets according to a specific embodiment of the present invention is described. Figure 1 A schematic diagram of a device for measuring cigarette packs provided by an embodiment of the present invention Figure 1 According to a specific embodiment of the present invention, a device for measuring cigarette packages is used to measure cigarette packages 2 transported on a conveyor belt 1, and the device includes: a first grating 3, which is arranged above the conveyor belt 1 along the conveying direction X of the cigarette package 2, and includes N light beams, N ≥ 1; an encoder (not shown in the figure), which is arranged on the motor shaft of the conveyor belt 1, and is used to measure the rotation angle of the motor shaft after the cigarette package 2 passes through each light beam; wherein, when the cigarette package 2 runs to the first grating 3, the first pulse number of each light beam passed by the cigarette package 2 in the encoder is obtained; when the cigarette package 2 leaves the first grating 3, the second pulse number of each light beam passed by the cigarette package 2 in the encoder is obtained.

[0039] Specifically, the device is used to measure the cigarette pack 2 transported on the conveyor belt 1. When the cigarette pack 2 runs to the first grating 3 set above the conveyor belt 1, the encoder records the first pulse number of the light beam passed by the cigarette pack 2. When the cigarette pack 2 leaves the first grating 3, the encoder records the first pulse number of the light beam passed by the cigarette pack 2. It can be understood that the first grating 3 includes N light beams, N ≥ 1, and the N light beams are numbered. The light beam closest to the conveyor belt 1 is numbered a1, followed by a2, a3...aN. Correspondingly, the light beams a1~aN represent the difference between the conveyor belt and the light beams a1~aN. That is to say, when the cigarette pack 2 begins to enter the first grating 3, when any of the light beams a1 to aN is blocked (the receiving end of the first grating cannot sense the light beam), a recording signal (first pulse number) will be given to the encoder, and the encoder will record the starting angle of the motor shaft corresponding to the light beam; when the cigarette pack 2 leaves the first grating 3, there will also be a change in the state of any of the light beams a1 to aN (the receiving end of the first grating will sense the light beam), and another recording signal (second pulse number) will be given to the encoder, and the encoder will also record the ending angle of the motor shaft corresponding to the light beam. The length of the corresponding beam section is calculated by the difference between the starting angle and the ending angle of the motor shaft of the corresponding light beam.

[0040] refer to Figure 3 , take beam a1 as an example, when the cigarette pack on the conveyor belt runs to beam a1, the encoder records the first pulse number of beam a1 and starts to record the rotation angle of the motor shaft. When the cigarette pack leaves beam a1, the encoder records the second pulse number of beam a1 and stops recording the rotation angle of the motor shaft to obtain the distance that the cigarette pack runs between the first pulse number and the second pulse number of beam a1 at the corresponding height position of beam a1, that is, a set of length data of the cigarette pack at the corresponding height position of beam a1. Therefore, the length data of multiple light beams blocked by the cigarette pack can be obtained, thereby obtaining the length of the cigarette pack. The device uses the cooperation of grating and encoder to measure the length of the cigarette pack, and the measurement accuracy is high.

[0041] like Figure 2 As shown, further, the device for measuring the cigarette package also includes: a second grating 4, which is arranged in front of the first grating 3 along the conveying direction X of the cigarette package 2; a push plate 5, which is arranged between the first grating 3 and the second grating 4, and the push plate 5 is driven by a servo motor (not shown in the figure) to push the cigarette package 2 to move along the conveying direction X.

[0042] Specifically, after the cigarette pack 2 passes through the first grating 3, it runs along the conveying direction X through the conveyor belt 1. At this time, a gap is left between the two push plates 5 so that the cigarette pack 2 can pass through the gap. After the cigarette pack 2 passes through the gap, the gap between the two push plates 5 gradually decreases and fits with one end of the cigarette pack 2. The push plate 5 driven by the servo motor pushes the cigarette pack 2 to move along the conveying direction X. It can be understood that through the cooperation of the first grating and the encoder, the length of the cigarette pack can be accurately calculated, and when the cigarette pack touches the second grating, a signal is sent to the servo motor to make the push plate continue to push a certain distance, which effectively avoids the inertial push of the motor, realizes the precise positioning of the cigarette pack, and improves the accuracy of cigarette pack positioning.

[0043] like Figure 2 As shown, further, the device for measuring the cigarette package also includes: a third grating 6, which is arranged in front of the second grating 4 along the conveying direction X of the cigarette package 2; a cutter 7, which is arranged in front of the third grating 6 along the conveying direction X of the cigarette package 2, and is used to slice the cigarette package 2.

[0044] Specifically, by accurately positioning the cigarette pack and combining it with the third grating, the slice size can be further accurately calculated, and the cutter can achieve accurate slicing of the cigarette pack.

[0045] like Figure 2 As shown, further, in the device for measuring cigarette packets, along the conveying direction X of the cigarette packets 2, the distance between the second grating 4 and the third grating 6 is a first distance S1, and the distance between the third grating 6 and the cutter 5 is a second distance S2.

[0046] Specifically, if the cigarette pack 2 moves to the third grating 6 under the push of the push plate 5, since the distance between the second grating 4 and the third grating 6 is the first distance S1, and the distance between the third grating 6 and the cutter 5 is the second distance S2, both of which are fixed lengths, the position of the cigarette pack can be further accurately located and the slice size can be calculated.

[0047] Furthermore, the encoder may be an absolute value encoder, and the accuracy of the encoder may be selected according to needs. A grating and an encoder of corresponding accuracy may be selected according to different accuracy requirements.

[0048] like Figure 4 As shown, a method for measuring a cigarette pack according to a specific embodiment of the present invention comprises:

[0049] S10: using the above device, obtaining the first pulse number of each light beam blocked by the cigarette pack in the encoder when the cigarette pack runs to the first grating;

[0050] S20: obtaining the second pulse number of each light beam blocked by the cigarette packet in the encoder when the cigarette packet leaves the first grating;

[0051] S30: Calculate the length of the cigarette pack according to the rotation angle of the motor shaft of the conveyor belt between the first pulse number and the second pulse number.

[0052] Specifically, using the above-mentioned device, when the cigarette pack runs to the first grating, the cigarette pack blocks multiple light beams of the grating, and the encoder records the first pulse number of each light beam blocked by the cigarette pack, and the encoder starts to record the rotation angle of the motor shaft of the conveyor belt; when the cigarette pack leaves the first grating, the encoder records the second pulse number of each light beam blocked by the cigarette pack, and the encoder stops recording the rotation angle of the motor shaft of the conveyor belt; according to the rotation angle of the motor shaft of the conveyor belt between the first pulse number and the second pulse number of each light beam, the distance that the light beam runs on the conveyor belt corresponding to the height position of the cigarette pack is obtained, and the distances that multiple light beams run on the conveyor belt corresponding to different height positions of the cigarette pack are combined to calculate the length of the cigarette pack.

[0053] That is to say, since the two sides of the cigarette package in the width direction are basically non-standard planes, when the cigarette package runs to the first grating, the front part of the cigarette package (with the transmission direction of the cigarette package as the front) will block the light beam at the corresponding height, and the system automatically records the first pulse number of the encoder when this light beam is blocked. The cigarette package continues to move forward, and more light beams will be blocked at this time. The system records the first pulse number of the encoder when each light beam is blocked in units of a single light beam; when the cigarette package leaves the first grating, there will also be a situation where the blocking of light beams at different heights ends at different times. The system also records the second pulse number of the encoder at the end of each light beam blocking in units of a single light beam until the last light beam is blocked. The first pulse number represents the pulse number of the encoder when a certain light beam is blocked, and the second pulse number represents the pulse number of the encoder when the light beam is blocked, that is, each blocked light beam has a first pulse number and a second pulse number.

[0054] Furthermore, the step of calculating the length of the cigarette pack according to the rotation angle of the motor shaft of the conveyor belt between the first pulse number and the second pulse number of each light beam includes: obtaining at least one set of length data for different height positions of the cigarette pack corresponding to each light beam according to the rotation angle of the motor shaft of the conveyor belt between the first pulse number and the second pulse number of each light beam; and calculating the average value of at least one set of length data to obtain the length of the cigarette pack.

[0055] Furthermore, in the step of calculating the average value of at least one set of length data, it includes: eliminating interference data in at least one set of length data to obtain correct data in at least one set of length data; and calculating the average value of at least one set of length data based on the correct data in at least one set of length data.

[0056] Specifically, the two sides of the cigarette pack in the width direction are usually not completely flat, and there will be some tobacco leaves (or burrs) extending out of the cigarette pack, which can easily interfere with the length measurement of the cigarette pack. Therefore, it is necessary to eliminate the interfering data of at least one set of length data, and calculate the average value of at least one set of length data based on the correct data in at least one set of length data, so as to further improve the accuracy of measuring the length of the cigarette pack.

[0057] Taking Guiyan (Xi) as an example, the method of eliminating interference data in at least one set of length data is described.

[0058]

[0059] Table 1 Burr data of a cigarette pack of Guiyan (Xiyan)

[0060] As described in Table 1, according to production requirements, the difference between two sets of data with adjacent serial numbers must not be greater than 10 mm. If it is greater than 10 mm, the set of data can be eliminated, such as data with serial numbers 4 and 7.

[0061] The above examples of eliminating data are only illustrative. The data to be eliminated can be set according to specific manufacturer requirements and product needs, and the present invention is not limited thereto.

[0062] like Figure 5 As shown, a method for locating a cigarette package according to a specific embodiment of the present invention comprises:

[0063] S100: using the above device, obtaining a signal when the cigarette pack runs to the second grating;

[0064] S200: according to the signal, the push plate pushes the cigarette pack to run a third distance;

[0065] S300: Obtaining position data of the cigarette pack according to the length of the cigarette pack, the distance between the second grating and the cutter, and the third distance.

[0066] Specifically, using the above-mentioned device, when the cigarette pack runs to the second grating or the cigarette pack touches the second grating, the system will give a signal to the push plate, and at this time the push plate pushes the cigarette pack to continue running the third distance, and obtains the position data of the cigarette pack according to the length of the cigarette pack, the distance between the second grating and the cutter, and the third distance, wherein the third distance can be pre-set as needed, and a servo motor is used to drive the push plate to push the cigarette pack to run, with a setting accuracy of 0.01mm, which effectively avoids the inertial push of the motor fed back by the photoelectric signal, and the distance between the second grating and the cutter is a fixed length, which can be pre-set as needed, combined with the length of the cigarette pack, the preset distance between the second grating and the cutter, and the third distance, to achieve precise positioning of the cigarette pack.

[0067] Furthermore, the method for locating the cigarette pack also includes: according to the signal, the push plate pushes the cigarette pack to run to the third grating; according to the length of the cigarette pack, the distance between the second grating and the third grating, and the distance between the third grating and the cutter, the position data of the cigarette pack is obtained.

[0068] Specifically, using the above device, when the cigarette pack runs to the second grating, or when the cigarette pack touches the second grating, the system will give a signal to the push plate, and the push plate will push the cigarette pack to continue running. If the cigarette pack runs to the third grating, the position data of the cigarette pack is obtained according to the length of the cigarette pack, the distance between the second grating and the third grating, and the distance between the third grating and the cutter, wherein the distance between the second grating and the third grating, and the distance between the third grating and the cutter are fixed lengths and can be pre-set as needed. Combined with the length of the cigarette pack, the preset distance between the second grating and the third grating, and the distance between the third grating and the cutter, the cigarette pack can be accurately positioned.

[0069] Furthermore, the method for locating the cigarette pack also includes: slicing the cigarette pack according to the position data of the cigarette pack.

[0070] Specifically, according to the position data of the cigarette pack and combined with the "three knives and four slices" slicing method, the push plate pushes the cigarette pack to the bottom of the cutter and corresponds to the slicing position of the cigarette pack to achieve accurate slicing of the cigarette pack.

[0071] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A device for measuring cigarette packets, used for measuring cigarette packets conveyed on a conveyor belt, characterized in that: The device comprises: A first grating is arranged above the conveyor belt along the conveying direction of the cigarette packs, and includes N light beams, where N ≥ 1; An encoder, disposed on the motor shaft of the conveyor belt, for measuring the rotation angle of the motor shaft after each light beam is blocked by the cigarette pack; When the cigarette pack runs to the first grating, the first pulse number of each light beam blocked by the cigarette pack in the encoder is obtained; when the cigarette pack leaves the first grating, the second pulse number of each light beam blocked by the cigarette pack in the encoder is obtained.

2. The device according to claim 1, characterized in that Also includes: a second grating, arranged in front of the first grating along the conveying direction of the cigarette packet; A push plate is disposed between the first grating and the second grating, and the push plate is driven by a servo motor to push the cigarette pack to move along the conveying direction.

3. The device according to claim 2, characterized in that Also includes: a third grating, arranged in front of the second grating along the conveying direction of the cigarette packet; A cutter is arranged in front of the third grating along the conveying direction of the cigarette pack and is used for slicing the cigarette pack.

4. The device according to claim 3, characterized in that Along the conveying direction of the cigarette pack, the distance between the second grating and the third grating is a first distance, and the distance between the third grating and the cutter is a second distance.

5. The device according to claim 1, characterized in that The encoder is an absolute value encoder.

6. A method for measuring cigarette packets, characterized in that: The method comprises: Using the device as claimed in claim 1, obtaining the first pulse number of each light beam blocked by the cigarette pack in the encoder when the cigarette pack runs to the first grating; Acquire the second pulse number of each light beam blocked by the cigarette pack in the encoder when the cigarette pack leaves the first grating; The length of the cigarette pack is calculated according to the rotation angle of the motor shaft of the conveyor belt between the first pulse number and the second pulse number of each light beam.

7. The method according to claim 6, characterized in that The step of calculating the length of the cigarette pack according to the rotation angle of the motor shaft of the conveyor belt between the first pulse number and the second pulse number of each light beam includes: obtaining at least one set of length data according to the rotation angle of the motor shaft of the conveyor belt between the first number of pulses and the second number of pulses of each of the light beams; The average value of the at least one set of length data is calculated to obtain the length of the cigarette pack.

8. The method according to claim 7, characterized in that The step of calculating the average value of at least one set of length data comprises: Eliminate interference data in the at least one set of length data to obtain correct data in the at least one set of length data; An average value of the at least one set of length data is calculated based on correct data in the at least one set of length data.

9. A method for locating cigarette packets, characterized in that: The method comprises: Using the device according to any one of claims 2 to 5, obtaining a signal when the cigarette packet runs to the second grating; According to the signal, the push plate pushes the cigarette pack to run a third distance; The position data of the cigarette pack is obtained according to the length of the cigarette pack, the distance between the second grating and the cutter, and the third distance.

10. The method according to claim 9, characterized in that Also includes: According to the signal, the push plate pushes the cigarette pack to run to the third grating; The position data of the cigarette pack is obtained according to the length of the cigarette pack, the distance between the second grating and the third grating, and the distance between the third grating and the cutter.

11. The method according to claim 9 or 10, characterized in that Also includes: The cigarette pack is sliced ​​according to the position data of the cigarette pack.

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