A dustproof device for filter rod outer diameter measuring instrument

Abstract

The utility model relates to filter rod outer diameter detector dustproof technical field, especially in kind of filter rod outer diameter measuring instrument dustproof device, including shell and annular air pipe, the shell middle is provided with the outer diameter measuring instrument installation cavity, and the outer diameter measuring instrument inserts the cover and is installed in installation cavity, the both sides of shell are provided with the perforation concentric with the measuring hole of outer diameter measuring instrument, annular air pipe is fixed in the perforation outside, the inside surface of annular air pipe is provided as the inclined plane, and the even setting of jet port is provided on the inclined plane, and the annular air pipe top is provided with air pipe joint, the filter rod outer diameter measuring instrument dustproof device provided by the utility model sets up the annular air pipe with the inclined plane jet port through the perforation outside both sides of shell, utilizes the compressed air to form dynamic air curtain barrier, and continuously or intermittently sweeps to the measuring light path area, effectively blocks the floating smoke and dust, fibre and particulate matter in production environment to enter laser measuring head area, guarantees the clear and stable of laser measurement signal.

Description

Technical Field

[0001] This utility model relates to the technical field of dust prevention for filter rod outer diameter measuring instruments, and in particular to a dust prevention device for filter rod outer diameter measuring instruments. Background Technology

[0002] In the cigarette production process, laser outer diameter measuring instruments for cigarette filter rods play a crucial role in ensuring the dimensional accuracy of these products. Utilizing a non-contact laser detection principle, they employ laser diode illumination and a photosensitive sensor array to acquire data, thereby achieving precise measurement of the outer diameter of the cigarette filter rod. However, the current environment in cigarette production workshops presents numerous factors detrimental to the stable operation of these measuring instruments. The presence of significant dust in cigarette workshops easily leads to the accumulation of dust in the measuring instrument's measuring port, interface areas, and housing gaps. Once dust enters the measuring instrument, it can obstruct the laser light source, sensor array, and product measurement path, hindering laser beam penetration and severely impacting diameter detection accuracy, resulting in measurement distortion. Furthermore, dust can penetrate the equipment through the interface, causing short circuits in electrical components, affecting normal equipment operation, and increasing the risk of equipment malfunctions.

[0003] In addition, the measuring instrument has strict operating procedures and maintenance requirements during use. For example, the equipment structure must not be modified without the consent of a professional to ensure that the equipment warranty is not affected; the probe must be cleaned regularly and calibration tool kits must be used to ensure measurement accuracy; at the same time, attention should be paid to the equipment status indicator lights, such as the "dirty warning light" and "measurement ready light", and attention should be paid to the safety signs on the equipment, such as laser warning signs.

[0004] Existing laser outer diameter measuring instruments for cigarette filter rods lack dustproof and dust removal structures. During the cigarette filter rod production process, the laser probe is easily obstructed by dust and tobacco residue, requiring frequent cleaning and maintenance, which seriously affects the continuity and efficiency of cigarette production. Given the shortcomings of existing filter rod outer diameter measuring instruments in terms of dustproofing, compatibility with equipment protection levels, and compliance with operating procedures and maintenance requirements, there is an urgent need for a dustproof device that can effectively prevent dust intrusion, does not affect measurement functions, is compatible with equipment characteristics, and is easy to maintain. This would ensure the long-term stable operation of the measuring instrument and improve the quality and efficiency of cigarette production. Utility Model Content

[0005] To address the lack of dust prevention and dust removal structures in existing laser outer diameter measuring instruments for cigarette filter rods, this utility model provides a dust prevention device for filter rod outer diameter measuring instruments suitable for use in cigarette filter rod production lines.

[0006] The solution adopted by this utility model to solve its technical problem is as follows: a dustproof device for a filter rod outer diameter measuring instrument, comprising a housing and an annular air pipe. The housing has an outer diameter measuring instrument mounting cavity in the middle, and the outer diameter measuring instrument insert is installed in the mounting cavity. The housing has through holes on both sides concentric with the measuring holes of the outer diameter measuring instrument. The annular air pipe is fixed to the outside of the through holes. The inner side of the annular air pipe is set as an inclined surface, and air jets facing the light source and CCD of the outer diameter measuring instrument are evenly arranged on the inclined surface. An air pipe connector is provided above the annular air pipe for connecting an air source. The side of the housing has an ear plate with a connecting hole. A bolt is inserted into the connecting hole and connected and fixed to the side column of the cigarette machine production line by the bolt.

[0007] Preferably, the outer shell is made of aluminum alloy and the surface is treated with anti-static coating; the edges and interfaces of the outer shell are equipped with high-precision guide nozzles.

[0008] Preferably, the annular trachea consists of two semicircular tubes, with trachea connectors provided on the upper side of each semicircular tube.

[0009] Preferably, a soft brush ring is installed on the perforation of the front cover of the measuring instrument. The soft brush ring includes a collar and brush bristles. The collar is fitted into the perforation of the front cover of the measuring instrument, and the brush bristles are uniformly fixed in a ring on the inner side of the collar.

[0010] Preferably, the upper end of the housing is provided with an opening, and the outer diameter measuring instrument is installed in the mounting cavity through the opening sleeve above.

[0011] Preferably, the air source is clean and dry compressed air, and is equipped with a three-unit air supply unit, with the jet pressure adjusted by a pressure reducing valve; the jet frequency is intermittent by default and is adjusted by a time relay.

[0012] The beneficial effects of this utility model are as follows: The dustproof device for the filter rod outer diameter measuring instrument provided by this utility model uses annular air pipes with inclined air jets set on the outside of the perforations on both sides of the outer shell to form a dynamic air curtain barrier with compressed air. This barrier continuously or intermittently blows into the measurement optical path area, effectively blocking smoke, dust, fibers and particulate matter floating in the production environment from entering the laser probe area. This significantly reduces the probability of probe contamination, thereby ensuring the clarity and stability of the laser measurement signal and improving the accuracy and repeatability of outer diameter detection.

[0013] A soft brush ring is added to the perforation of the front cover of the measuring instrument, which can gently scrape off loose smoke or fibers attached to the surface when the filter rod passes through, thus playing a preliminary cleaning role, while avoiding damage to the probe or filter rod by hard contact; the upper end of the outer shell is set with an opening, so the outer diameter measuring instrument can be quickly inserted or removed from the top without disassembling the entire equipment, which greatly improves the convenience of on-site installation and the efficiency of later maintenance. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the filter rod outer diameter measuring instrument and the front cover plate; Figure 2 This is a schematic diagram of the filter rod outer diameter measuring instrument and dustproof device; Figure 3 This is a schematic diagram of the structure of the annular air pipe on the outside of the dustproof device; Figure 4 This is a schematic diagram of the cross-sectional structure of the annular trachea.

[0015] The following are the labels in the diagram: 1. Filter rod outer diameter measuring instrument; 2. Front cover plate; 31. Collar ring; 32. Brush bristles; 4. Outer shell; 5. Ear plate; 6. Annular air tube; 7. Air tube connector; 61. Air jet nozzle. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below.

[0017] Example 1: As Figure 2 and Figure 3 As shown, this invention provides a dustproof device for a filter rod outer diameter measuring instrument, including a housing 4 and an annular air pipe 6. The housing 4 is made of aluminum alloy, which has good strength and heat dissipation performance. The surface of the aluminum alloy housing 4 is treated with an anti-static agent to reduce the adsorption of dust by static electricity. An outer diameter measuring instrument mounting cavity is provided in the middle of the housing 4, and an opening is provided at the upper end of the housing 4. The outer diameter measuring instrument is inserted into the mounting cavity through the opening at the top, ensuring a tight fit and providing a stable installation environment. Through holes concentric with the measuring holes of the outer diameter measuring instrument are provided on the front and rear sides of the housing 4 to ensure normal measurement operation.

[0018] Oil-resistant rubber seals are tightly fitted at the edges and interfaces of the housing. These seals effectively prevent dust from entering these areas and are suitable for oily working environments, ensuring the device's sealing performance and stability.

[0019] The perforated sets on the front and rear sides of the outer shell are equipped with high-precision guide nozzles. The high-speed filter rod passes through the guide nozzles, which play a role in lifting, anti-vibration, and adhesive blocking in the through holes. Guide nozzles are installed on both the front and rear of the outer shell to ensure the concentricity of the filter rod in the detector and reduce filter rod jumping.

[0020] The high-precision guide nozzle, also known as a calibration ring or centering ring, is a precision component installed in the central perforation of an external diameter measuring instrument. Its core function is to ensure the measured object is precisely positioned on the measurement axis, providing a reference position for the laser probe and CCD sensor. It is a key component for achieving micron-level or even sub-micron-level measurement accuracy. The guide nozzle's annular body is circular, with a central through-hole diameter slightly larger than the upper limit of the measurement range. Its inner surface undergoes ultra-precision grinding, achieving a roughness of Ra 0.02μm or less, ensuring precise alignment with the measured object and a tight fit with the measuring instrument body to guarantee concentricity.

[0021] The annular trachea 6 is securely fixed to the outer shell on the outside of the perforation, such as... Figure 4 As shown, it consists of two semi-circular tubes, with air pipe connectors 7 installed on the upper side of each semi-circular tube for easy connection to an air source. The inner surface of the annular air pipe 6 is set as an inclined surface, with air jets 61 evenly distributed on the inclined surface, facing the light source and CCD of the outer diameter measuring instrument. When the air source is connected, the airflow ejected from the air jets 61 can form an effective barrier around the perforation, preventing dust from approaching the measuring hole and ensuring a clean measuring environment for the measuring instrument.

[0022] Ear plates 5 are provided on the side of the outer casing 4, and connection holes are machined on the ear plates 5. By inserting bolts through the connection holes, the entire dustproof device is connected and fixed to the side column of the cigarette machine production line. This fixing method ensures the stability of the dustproof device and facilitates disassembly and maintenance when needed.

[0023] The air source is clean, dry compressed air, and it is equipped with a three-piece air supply unit. The jet pressure is adjusted by a pressure reducing valve; the jet frequency is intermittent by default and is adjusted by a time relay. When the clean, dry air source is connected to the annular air pipe 6 through the air pipe connector 7, the gas is ejected from the jet nozzles 61 on the inclined surface toward the center of the perforation. Because the jet nozzles 61 are evenly distributed and at a certain angle, the ejected airflow forms an annular airflow barrier around the perforation. This airflow barrier can effectively prevent external dust from approaching the measuring hole, thereby providing a relatively clean measuring environment for the filter rod outer diameter measuring instrument 1 and ensuring the accuracy of the measurement results.

[0024] The dusty environment in cigarette production workshops is quite complex. After installing this dustproof device, the airflow barrier formed by the jet of the annular air pipe 6 and the double protection of the soft brush ring effectively reduce the impact of dust on the measurement accuracy of the filter rod outer diameter measuring instrument 1, greatly improving the accuracy and stability of the measurement, ensuring the quality control of the filter rod outer diameter during cigarette production, improving production efficiency, and reducing the maintenance frequency of the measuring instrument.

[0025] Example 2: Figure 1As shown, a soft brush ring is installed on the perforation of the front cover of the measuring instrument. The soft brush ring consists of a collar 31 and brush bristles 32. The collar 31 is precisely fitted into the perforation of the front cover 2 of the measuring instrument, ensuring a firm installation and accurate positioning. The brush bristles 32 are evenly fixed in a ring on the inner side of the collar 31. When the filter rod passes through the perforation, the brush bristles 32 can effectively prevent external dust from entering the measuring instrument with the filter rod without damaging the surface of the filter rod, thus ensuring that the quality of the filter rod is not affected.

[0026] A heat insulation layer is added inside the outer casing 4 to reduce the impact of the external ambient temperature on the measuring instrument and ensure that the measuring instrument works in a stable temperature environment.

[0027] The size and angle of the jet nozzle 61 of the annular air pipe 6 are finely adjusted, and the jet angle is set to 30°, which is more in line with the actual airflow dynamics, so that the jet air is more concentrated and the dust blocking effect is enhanced.

[0028] The bristles 32 of the soft brush ring are made of a new type of anti-static bristle material, which can better block dust, reduce the phenomenon of dust adsorption by the bristles 32 due to static electricity, and enhance the dustproof ability of the soft brush ring.

[0029] Elastic washers are added to the connection between the ear plate 5 and the side column to enhance the stability of the connection and prevent the bolts from loosening due to equipment vibration. At the same time, the bolts are treated with rust prevention to extend their service life.

[0030] To better adapt to different production environments and dust concentrations, the jetting system was upgraded with intelligent technology. Pressure and flow sensors were installed in the air duct lines to monitor jetting pressure and flow in real time. Connected to the control system, the system automatically adjusts jetting pressure and flow based on sensor feedback data. For example, when a high dust concentration is detected in the workshop, the system automatically increases jetting pressure and flow to enhance dust suppression; when the dust concentration is low, it reduces jetting pressure and flow to conserve air.

[0031] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A dustproof device for a filter rod outer diameter measuring instrument, characterized in that, The device includes a housing (4) and an annular air pipe (6). The housing (4) has an outer diameter measuring instrument mounting cavity in the middle, and the outer diameter measuring instrument insert is installed in the mounting cavity. The housing (4) has through holes on both sides that are concentric with the measuring holes of the outer diameter measuring instrument. The annular air pipe (6) is fixed to the outside of the through holes. The inner side of the annular air pipe (6) is set as an inclined surface. Air nozzles (61) facing the light source and CCD of the outer diameter measuring instrument are evenly arranged on the inclined surface. An air pipe connector (7) is provided above the annular air pipe (6) for connecting the air source. The side of the housing (4) is provided with an ear plate (5). The ear plate (5) is provided with a connecting hole. A bolt is passed through the connecting hole and connected and fixed to the side column of the cigarette machine production line through the bolt.

2. The dustproof device for the filter rod outer diameter measuring instrument according to claim 1, characterized in that: The outer shell (4) is made of aluminum alloy and the surface is treated with anti-static treatment; the edges and interfaces of the outer shell (4) are equipped with high-precision guide nozzles.

3. The dustproof device for the filter rod outer diameter measuring instrument according to claim 1, characterized in that: The annular trachea (6) consists of two semicircular tubes, and trachea connectors (7) are respectively provided on the upper side of the two semicircular tubes.

4. The dustproof device for the filter rod outer diameter measuring instrument according to claim 1, characterized in that: A soft brush ring is installed on the perforation of the front cover of the measuring instrument. The soft brush ring includes a collar (31) and bristles (32). The collar (31) is fitted into the perforation of the front cover plate (2) of the measuring instrument, and the bristles (32) are evenly fixed in a ring on the inner side of the collar (31).

5. The dustproof device for the filter rod outer diameter measuring instrument according to claim 1, characterized in that: The upper end of the outer shell (4) is provided with an opening, and the outer diameter measuring instrument is installed in the mounting cavity through the upper opening sleeve.

6. The dustproof device for the filter rod outer diameter measuring instrument according to claim 1, characterized in that: The air source is clean and dry compressed air, and it is equipped with a three-unit air supply unit. The jet pressure is adjusted by a pressure reducing valve. The jet frequency is intermittent by default and can be adjusted by a time relay.

Images