A device for measuring the length of a cigarette filter rod

Abstract

The utility model discloses a device of measuring cigarette filter stick length, including industry camera, telecentric lens, light source subassembly, full passageway multistage structure, vertical movement mechanism, horizontal movement mechanism, measuring platform. The position of measuring platform is collected in real time by the present application using magnetic scale, avoids the clearance error of screw stepper motor and the step -loss probability influence of open -loop control of stepper motor. The present application can complete calibration using 2 standard sticks, and the required standard stick quantity is less, and the calibration saves time. The present application uses 3 groups of light source, can measure the length of cigarette filter stick, also can measure the cigarette tobacco head, the burrs of filter stick, and the measurement result is more accurate. Adopt full passageway multistage structure, wherein, full passageway can guarantee the vertical entry of cigarette / filter stick, and multistage can realize the lightweight of lens.

Description

Technical Field

[0001] This utility model relates to the field of cigarette testing technology, and in particular to a device for measuring the length of cigarette filter rods. Background Technology

[0002] In the field of physical length testing of cigarettes / filters, lasers are mainly used to measure the physical length of cigarettes / filters. The system uses four settings to accommodate different lengths, which can be achieved through rotation or telescopic methods. Each setting needs to be calibrated during calibration, requiring a total of eight standard rods, which makes the measurement efficiency low. In addition, laser measurement may be affected by tobacco ends or burrs on the filter rod, resulting in inaccurate measurement results.

[0003] Therefore, it is necessary to develop a device for measuring the length of cigarette filter rods to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to design a device for measuring the length of cigarette filter rods in order to solve the above-mentioned problems.

[0005] This utility model achieves the above objectives through the following technical solutions: A device for measuring the length of a cigarette filter rod, comprising: Industrial cameras; Telecentric lens; connection between industrial camera and telecentric lens; Light source assembly; the light source assembly is positioned in front of the telecentric lens; Full-channel multi-stage structure; The full-channel multi-stage structure is located below the light source assembly, and multiple stage gaps are set along the vertical direction within the full-channel multi-stage structure; Vertical moving mechanism; Horizontal moving mechanism; the moving end of the horizontal moving mechanism is connected to the vertical moving mechanism; Measurement platform; The measurement platform is installed on the moving end of the horizontal moving mechanism. When performing calibration or measuring the length of cigarette filter rods, the measurement platform is selectively inserted into a gear gap. The lower end of the standard rod or cigarette filter rod is placed on the measurement platform within the full-channel multi-gear structure, and the upper end of the standard rod or cigarette filter rod is placed inside the light source assembly.

[0006] Specifically, the light source assembly includes a backlight, a left light source, a right light source, and a diffuse reflector. The backlight, left light source, and right light source are evenly distributed around the upper end of the standard rod or cigarette filter rod. The diffuse reflector is placed inside the backlight. The backlight, diffuse reflector, upper end of the standard rod or cigarette filter rod, and telecentric lens are arranged sequentially in a straight line.

[0007] Furthermore, the full-channel multi-position structure includes a glass cover and a back plate. One side of the glass cover and one side of the back plate are hinged. After the glass cover and the back plate are closed, a through circular full channel is formed vertically inside for sliding of a standard rod or cigarette filter rod. Multiple position gaps are set in the circular full channel along its length direction. Multiple position gaps correspond to the openings on the outside of the glass cover for insertion of the measuring platform.

[0008] Furthermore, the vertical movement mechanism includes a lead screw stepper motor, a ball linear guide, and a slider. The ball linear guide includes a screw, a moving block, two moving parts, and two guide rails. The lead screw stepper motor is fixed in position, and its shaft is connected to the upper end of the screw. The two guide rails are located on both sides of the screw and are parallel to the screw. The two moving parts are slidably engaged with the two guide rails respectively. The moving block is provided with a screw hole and is threadedly engaged with the screw. The first side of the slider is connected to the moving block and the two moving parts.

[0009] Preferably, the vertical moving mechanism further includes a magnetic scale, which is mounted on the slider.

[0010] Furthermore, the horizontal movement mechanism includes a ball linear cylinder, which is horizontally mounted on the second side of the slider. The second side of the slider is opposite to the first side, and the measuring platform is mounted on the piston rod of the ball linear cylinder.

[0011] Furthermore, a light source protective cover is provided on the light source assembly, and an observation port is provided on the side wall of the light source protective cover, which is aligned with the telecentric lens.

[0012] The beneficial effects of this utility model are as follows: This application uses a magnetic scale to acquire the position of the measurement platform in real time, avoiding the impact of backlash error of the lead screw stepper motor and the step loss probability of the open-loop control of the stepper motor.

[0013] This application can complete the calibration using only two standard bars, with calibration performed in the first and last stages. This reduces the number of standard bars required and saves time during calibration.

[0014] This application uses three sets of light sources, which can measure the length of cigarette filter rods, as well as the tobacco tips and burrs on the filter rods, resulting in more accurate measurement results.

[0015] This application adopts full-channel, multi-position measurement, with a wide range of length compatibility.

[0016] It adopts a full-channel, multi-position structure. The full channel ensures the vertical entry of cigarettes / filter rods, while the multi-position structure enables the lens to be lightweight. The lens only needs a measurement range of 10mm to measure cigarettes / filter rods with a span of 55~150mm. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the opening structure of the full-channel multi-position structure in this utility model; Figure 4 This is a schematic diagram of the closed structure of the full-channel multi-gear structure in this utility model; Figure 5 This is a top view of the full-channel multi-gear structure in this utility model; Figure 6 This is a schematic diagram of the lead screw stepper motor in this utility model; Figure 7 This is a schematic diagram of the cooperative structure between the screw and the moving block in this utility model; Figure 8 This is a schematic diagram of the structure of the ball linear cylinder in this utility model; Figure 9 This is a schematic diagram of the internal structure of the light source protective cover in this utility model; Figure 10 This is a side view of the present invention.

[0018] Numbering in the diagram: 1-Industrial camera, 2-Vertical movement mechanism, 3-Base plate, 4-Solenoid valve, 5-Measuring platform, 6-Glass cover, 7-Light source protective cover, 8-Telecentric lens, 9-Back plate, 10-First gear gap, 11-Circular full channel, 12-Screw stepper motor, 13-Ball linear guide, 131-Screw, 132-Moving block, 133-Moving component, 134-Guide rail, 14-Slider, 15-Magnetic scale, 16-Ball linear cylinder, 17-Baffle, 18-Backlight, 19-Left light source, 20-Right light source, 21-Diffuse reflector, 22-Lowest gear gap. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] like Figure 1 and 2 As shown in Figures 8 and 10, an apparatus for measuring the length of a cigarette filter rod includes: Industrial camera 1; Telecentric lens 8; Industrial camera 1 is connected to telecentric lens 8; Light source assembly; the light source assembly is positioned in front of the telecentric lens 8; Full-channel multi-stage structure; The full-channel multi-stage structure is located below the light source assembly, and multiple stage gaps are set along the vertical direction within the full-channel multi-stage structure; Vertical moving mechanism 2; Horizontal moving mechanism; the horizontal moving mechanism is connected to the moving end of the vertical moving mechanism 2; Measurement platform 5; Measurement platform 5 is installed on the moving end of the horizontal moving mechanism. When calibrating or measuring the length of cigarette filter rods, measurement platform 5 is selectively inserted into a gear gap. The lower end of the standard rod or cigarette filter rod is placed on measurement platform 5 within the full-channel multi-gear structure, and the upper end of the standard rod or cigarette filter rod is placed within the light source assembly.

[0027] In this embodiment, the microcontroller controls the vertical moving mechanism 2 to move the measuring platform 55 up or down. During movement, the measuring platform 5 is in a retracted state. The measuring platform 5 is mounted on the horizontal moving mechanism. After moving to the designated position, the microcontroller controls the solenoid valve 4 to actuate, causing the horizontal moving mechanism to extend and pull the baffle 17 of the measuring platform 5 into the channel. The light source inside the light source protective cover 7 is illuminated, and the camera acquires images through the telecentric lens 8. In some embodiments, such as Figure 9 As shown, the light source assembly includes a backlight 18, a left light source 19, a right light source 20, and a diffuse reflector 21. The backlight 18, left light source 19, and right light source 20 are evenly distributed around the upper end of the standard rod or cigarette filter rod. The diffuse reflector 21 is placed inside the backlight 18. The backlight 18, diffuse reflector 21, the upper end of the standard rod or cigarette filter rod, and the telecentric lens 8 are sequentially arranged in a straight line. During measurement, the backlight 18 is turned on to measure the length of the sample. When the backlight 18 is turned off and the left light source 19 and right light source 20 are turned on, the physical parameters of the cigarette tobacco tip can be measured.

[0028] In some embodiments, such as Figure 3-5 As shown, the full-channel multi-position structure includes a glass cover 6 and a back plate 9. One side of the glass cover 6 and one side of the back plate 9 are hinged. After the glass cover 6 and the back plate 9 are closed, a through circular full channel 11 is formed vertically inside for the sliding of standard rods or cigarette filter rods. Multiple position gaps are set along the length of the circular full channel 11. Multiple position gaps correspond to openings on the outside of the glass cover 6 for the insertion of the measuring platform 5. During measurement, the baffle 17 of the measuring platform 5 enters and exits the position gap through the openings on the outside of the glass cover 6. After the glass cover 6 is rotated and closed, it forms a circular full channel 11 with the back plate 9, and the cigarette filter rod product will be measured and transported within this channel.

[0029] In some embodiments, such as Figure 6 and 7As shown, the vertical moving mechanism 2 includes a lead screw stepper motor 12, a ball linear guide rail 13, and a slider 14. The ball linear guide rail 13 includes a screw 131, a moving block 132, two moving parts 133, and two guide rails 134. The lead screw stepper motor 12 is fixedly positioned, and its shaft is connected to the upper end of the screw 131. The two guide rails 134 are located on both sides of the screw 131 and are parallel to the screw 131. The two moving parts 133 are slidably engaged with the two guide rails 134 respectively. The moving block 132 is provided with a screw hole and is threadedly engaged with the screw 131. The first side of the slider 14 is connected to the moving block 132 and the two moving parts 133.

[0030] In some embodiments, such as Figure 8 As shown, the vertical moving mechanism 2 also includes a magnetic scale 15, which is mounted on the slider 14. The microcontroller-controlled lead screw stepper motor 12 moves, driving the screw 131 to rotate. Because the moving part 133 cooperates with the guide rail 134 for vertical guidance and lateral limiting, the moving block 132 can only move vertically along the screw 131. The magnetic scale 15 is fixed on the slider 14 to detect the position of the slider 14 in the vertical direction in real time.

[0031] In some embodiments, such as Figure 8 As shown, the horizontal movement mechanism includes a ball linear cylinder 16, which is horizontally mounted on the second side of the slider 14. The second side of the slider 14 is opposite to the first side. The measuring platform 5 is mounted on the piston rod of the ball linear cylinder 16. The glass cover 6 and the back plate 9 form a full-channel multi-position structure. Driven by a lead screw linear motor, the ball linear cylinder 16 can move to any position. The ball linear cylinder 16 drives the baffle 17 of the measuring platform 5 to extend into or retract from the measuring channel to achieve measurement of different lengths and material feeding functions.

[0032] In some embodiments, such as Figure 1 and 2 As shown, a light source protective cover 7 is provided on the light source assembly, and an observation port is provided on the side wall of the light source protective cover 7, which is set to be aligned with the telecentric lens 8.

[0033] In some embodiments, the device for measuring the length of cigarette filter rods further includes a horizontally arranged base plate 3, on which a telecentric lens 8, a lead screw stepper motor 12, a back plate 9, and a light source assembly are all fixedly mounted.

[0034] Measurement Principle: The cigarette or filter sample falls vertically from the previous measurement function, entering through the hole in the middle of the protective cover 7. Before entering, the baffle 17 of the measurement platform 5 is controlled by the host computer to enter the required measurement length gap. After entering, the cigarette or filter falls onto the measurement platform 5 through the circular full-channel 11, with the upper end of the cigarette or filter just within the machine vision field of view. The camera captures the image, and after the image algorithm is processed, the baffle 17 of the measurement platform 5 leaves the circular full-channel 11 through the action of the ball linear cylinder 16, and the cigarette or filter falls vertically, leaving the length measurement function unit. After the machine vision system has collected the data, the ball linear cylinder 16 retracts, the baffle 17 of the measurement platform 5 leaves the channel, and the cigarette / filter falls to enter the next measurement function.

[0035] Calibration function: The calibration principle is similar to the measurement principle. A 60mm long circular rod, inspected by a metrology center, is manually placed into the protective cover 7. Before placement, the measuring platform 5 is moved up and down to the first position 10 of the uppermost gap. Then, the baffle 17 of the measuring platform 5 enters the circular full channel 11. One end of the 60mm rod is on the baffle 17 of the measuring platform 5, and the other end is in the field of view of the industrial camera 1. At this time, an image is acquired, and the pixel L position of the camera is calibrated by the host computer through image processing. After completion, the 60mm calibration rod is removed. Then, another 150mm long circular rod, inspected by a metrology center, is manually placed into the protective cover 7. Before placement, the measuring platform 5 is moved up and down to the lowest position 22 of the lowermost gap. Then, the baffle 17 of the measuring platform 5 enters the circular full channel 11. One end of the 150mm rod is on the measuring platform 5, and the other end is in the field of view of the industrial camera 1. At this time, an image is acquired, and the K value of the relationship between the magnetic scale 15 and its length is calibrated by the host computer through image processing. After completion, the 150mm calibration rod is removed. Finally, the length of the cigarette filter rod sample was calculated and measured using the calibrated pixel L position and K value.

[0036] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A device for measuring the length of a cigarette filter rod, characterized in that, include: Industrial cameras; Telecentric lens; Connecting an industrial camera to a telecentric lens; Light source components; The light source assembly is positioned in front of the telecentric lens; Full-channel, multi-gear structure; The full-channel multi-stage structure is located below the light source assembly, and multiple stage gaps are set along the vertical direction within the full-channel multi-stage structure; Vertical moving mechanism; Horizontal moving mechanism; the moving end of the horizontal moving mechanism is connected to the vertical moving mechanism; Measurement platform; The measurement platform is installed on the moving end of the horizontal moving mechanism. When performing calibration or measuring the length of cigarette filter rods, the measurement platform is selectively inserted into a gear gap. The lower end of the standard rod or cigarette filter rod is placed on the measurement platform within the full-channel multi-gear structure, and the upper end of the standard rod or cigarette filter rod is placed inside the light source assembly.

2. The device for measuring the length of a cigarette filter rod according to claim 1, characterized in that, The light source assembly includes a backlight, a left light source, a right light source, and a diffuse reflector. The backlight, left light source, and right light source are evenly distributed around the upper end of the standard rod or cigarette filter rod. The diffuse reflector is placed inside the backlight. The backlight, diffuse reflector, upper end of the standard rod or cigarette filter rod, and telecentric lens are arranged in a straight line.

3. The device for measuring the length of a cigarette filter rod according to claim 1, characterized in that, The full-channel multi-position structure includes a glass cover and a back plate. One side of the glass cover and one side of the back plate are hinged. After the glass cover and the back plate are closed, a through circular full channel is formed vertically inside for the sliding of a standard rod or cigarette filter rod. Multiple position gaps are set in the circular full channel along its length direction. Multiple position gaps correspond to the openings on the outside of the glass cover for the insertion of the measuring platform.

4. The device for measuring the length of a cigarette filter rod according to claim 1, characterized in that, The vertical movement mechanism includes a lead screw stepper motor, a ball linear guide, and a slider. The ball linear guide includes a screw, a moving block, two moving parts, and two guide rails. The lead screw stepper motor is fixed in position, and its shaft is connected to the upper end of the screw. The two guide rails are located on both sides of the screw and are parallel to the screw. The two moving parts are slidably engaged with the two guide rails respectively. The moving block has a screw hole and is threadedly engaged with the screw. The first side of the slider is connected to the moving block and the two moving parts.

5. The device for measuring the length of a cigarette filter rod according to claim 4, characterized in that, The vertical movement mechanism also includes a magnetic scale, which is mounted on the slider.

6. The device for measuring the length of a cigarette filter rod according to claim 5, characterized in that, The horizontal movement mechanism includes a ball linear cylinder, which is horizontally mounted on the second side of the slider. The second side of the slider is opposite to the first side. The measuring platform is mounted on the piston rod of the ball linear cylinder.

7. The device for measuring the length of a cigarette filter rod according to claim 2, characterized in that, A light source protective cover is provided on the light source assembly, and an observation port is provided on the side wall of the light source protective cover, which is set to be aligned with the telecentric lens.

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