CN104062210A - Particle collection and detection system - Google Patents
Particle collection and detection system Download PDFInfo
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- CN104062210A CN104062210A CN201310673621.1A CN201310673621A CN104062210A CN 104062210 A CN104062210 A CN 104062210A CN 201310673621 A CN201310673621 A CN 201310673621A CN 104062210 A CN104062210 A CN 104062210A
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Abstract
The invention discloses a particle collection and detection system including a fixed base frame and a barometric pressure drive which are arranged in an automatic granulation machine drum, the fixed base frame is provided with a supporting shaft, the supporting shaft is provided with a box body fixing frame, the box body fixing frame is provided with at least one mining lighting box, the supporting shaft is provided with a sampling handle, the position of the sampling handle is corresponding to that of the mining lighting box, the sampling handle is welded with a sample guiding tube, the sampling handle and the sample guiding tube are driven to move by rotation of the supporting shaft for realization of particle sampling, the mining lighting box is provided with a particle collection device camera and a particle cleaning device. The barometric pressure drive is used as a power source to drive the sampling handle to collect particles, the particles are sent onto a detecting platform by the sample guiding tube, after a particle image is collected by the particle collection device camera, the particles are left the detecting platform and returned to the drum by the particle cleaning device, and the particle collection and detection system has the advantages of compact structure and simple composition, and can be quick and convenient in detection of size and shape features of the particles in the granulation machine drum.
Description
Technical field
What the present invention relates to is a kind of particle image acquisition testing system, specifically a kind of system that automatically gathers particle specimens and utilize digital camera Real-time Collection particle image that realizes in roller pelletizer.
Technical background
Granulating technique is used widely at many industrial circles such as preparation of nonmetallic mineral deep processing, chemical products, adsorbent, catalyzer, fertilizer, metallurgy and new material.Granulation operation relates to the wide spectrum of national economy, and existing granulating technique labour intensity is large, balling ratio is low, product homogeneity is poor, production lot is little, it is seriously polluted to produce.Adopt cylinder granulation can reduce the pollution of production run to environment, improve granulation production efficiency, but this technology need rely on artificial experience to the judgement of particle growth situation in producing, and can not realize the real-time monitoring of particle growth process.During because of cylinder granulation, lack reliable grain size and sphericity data, cannot carry out the robotization of the flow processs such as feed, spraying, granulation, discharging and control, so the poor controllability of grain products quality.
Traditional cylinder granulation need be combined use with particle screening equipment, to guarantee granularity and the sphericity of particle.The problems such as the particle that cylinder granulation is produced will rely on manual delivery to particle screening equipment, and this process relies on two independently productive units, therefore causes labor strength large, and production efficiency is low, and yield rate is lower.In order to guarantee granularity and the sphericity of particle, enhance productivity, reduce workman's intensity, online measuring technique need be combined with granulating technique, improve the automaticity of cylinder granulation.
Summary of the invention
The object of the present invention is to provide a kind of compact conformation, form simply, can automatically gather particle specimens and utilize a kind of particle collection and the detection system of digital camera Real-time Collection particle image.This device, after being combined with host computer, detects particle diameter and the shape data in granulating machine according to Digital image analysis technique, for the robotization of cylinder granulation, controls foundation is provided.
The technical solution adopted in the present invention is: a kind of particle collection and detection system, comprise the stationary base mount and the actuating device of atmospheric pressure that are arranged in automatic granulating machine cylinder, stationary base mount is provided with back shaft, back shaft is provided with casing fixed mount, casing fixed mount is provided with at least one and adopts according to case, back shaft is provided with sampling handle, sampling handle is corresponding with the position of adopting according to case, on sampling handle, be welded with sample guide pipe, rotarily drive sampling handle and sample guide pipe by back shaft move, realize the sampling of particle, adopt according in case and be provided with particle harvester camera and particle clearing apparatus.
Described stationary base mount comprises the fixed base plate being fixed in automatic granulating machine cylinder, also comprises main backstop, screw I, screw II, travel switch, lubricated screw; Wherein fixed base plate is fixedly connected with by screw I with automatic granulator; main backstop is fixedly connected with by screw I with fixed base plate; travel switch is fixedly connected on main backstop by screw II; respectively there are main backstop support and connection at back shaft two ends; realize the steadiness of mechanism; lubricated screw is fixed on main backstop and back shaft junction, and lubricating oil can enter by screw hole, lubricate.
Described actuating device of atmospheric pressure comprises the base being fixed in automatic granulating machine cylinder, also comprises screw III, screw IV, pneumatic cylinder, pneumatic cylinder base, piston rod, connecting rod, pin, nut; Wherein base is fixedly connected with by screw III with granulating machine; pneumatic cylinder base is connected by pin with base; can make pneumatic cylinder base along with pin rotates; pneumatic cylinder base is fixedly connected with by screw IV with pneumatic cylinder; piston rod one end is connected to pneumatic cylinder the inside and moves reciprocatingly; the other end is connected with connecting rod, thereby drivening rod swings, finally by the range of movement of travel switch control link.
Described adopting according to being provided with particle harvester and particle clearing apparatus in case, described in adopt according to case and comprise upper box lid, lower case lid, casing, screw, feeding gate, Spring hinge I; Upper box lid and lower case lid are separately fixed at the two ends up and down of casing, and casing is fixedly connected by welding on casing fixed mount, and casing fixed mount is fixedly connected with by screw with main backstop, and feeding gate is connected on casing by Spring hinge I, screw; Described particle image harvester comprises industrial camera, camera frame, monitor station, screw; Camera frame is fixedly connected on and is adopted according on the upper box lid of case by screw, industrial camera is fixedly connected with by screw with camera frame, monitor station is connected by screw to be fixed on and adopts according in case, and the particle of collection is entered and adopted according to case by feeding gate, falls on monitor station and detects.
Described particle cleaning and driven unit thereof comprise cleaning brushing piece, cleaning brushing piece fixture, cleaning brush holder support, connecting rod I, connecting rod II, connecting rod III, motor, motor fixing frame, shaft coupling; Motor fixing frame is fixedly connected on monitor station lower end, motor is fixedly connected on motor fixing frame by screw, the output shaft of motor is connected with connecting rod I by shaft coupling, connecting rod I is connected by revolute pair with connecting rod II, connecting rod II is connected by revolute pair with connecting rod III, connecting rod III is connected with cleaning brush holder support through monitor station, and cleaning brush holder support is connected with cleaning brushing piece by cleaning brushing piece fixture.Described discharge door and driven unit thereof comprise discharge door, Spring hinge II, Connection Block, sphere lid, spherical pair connecting rod I, spherical pair connecting rod II, screw, connecting rod IV, locking cap, connecting rod V, orienting sleeve, torsion spring; Discharge door is connected to lower case lid bottom by Spring hinge II and screw, Connection Block is fixedly connected on discharge door by screw, spherical pair connecting rod I one end contacts with Connection Block and is covered with screw and fixed by sphere, the other end contacts with spherical pair connecting rod II by sphere and covers with screw and fix, and forms spherical pair and connects.Connecting rod IV is fixed on monitor station bottom by locking cap, and a torsion spring is installed in the junction of connecting rod IV and monitor station.Connecting rod IV two ends are connected by revolute pair with connecting rod V, spherical pair connecting rod II respectively.Orienting sleeve is fixed by screws in monitor station side, and orienting sleeve is used for control link V and moves along rectilinear direction.
The present invention has following beneficial effect: the present invention is usingd air pressure driving as power source driving sampling handle collection particle; and by sample guide pipe, particle is delivered on monitor station; after collected by camera particle image; by particle clearing apparatus, particle is left in monitor station return roller; particle collection of the present invention and detection system compact conformation; form simply, can quick and convenient detection granulating machine cylinder endoparticle size and shape feature.In the present invention, adopt according to case endoparticle clearing apparatus and adopt four-bar mechanism, drive motor only needs one direction rotation just can make cleaning brush swing back and forth, and realizes the cleaning to sampling particle, and control system is simple; In the present invention, particle drawing mechanism is used the combination of lever principle and spherical pair mechanism, drives the folding of discharge door by the to-and-fro movement of cleaning brush, and the particle that makes to sample returns to granulating machine.The physical construction that drawing mechanism adopts is controlled, simple in structure, reliable in action.Utilize the swing arm of four-bar mechanism as the power source of drawing mechanism, reduced by a Power Drive Unit, make system architecture compact, reliability is high; The present invention does particle image collection and uses in roller pelletizer, has solved and has relied on artificial experience judgement particle growth situation in the past, and labor strength is large, the problem that production efficiency is lower.The particle image that the design gathers, after being combined with host computer, detects particle diameter and the shape data in granulating machine according to Digital image analysis technique, for the robotization of cylinder granulation, controls foundation is provided; In the present invention, adopt according to case and use totally-enclosed design, reduce dust, particle to adopting the impact according to camera lens in case, it is more accurate to make to detect.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is the explosive view of fixed frame in Fig. 1;
Fig. 3 is the explosive view of actuating device of atmospheric pressure in Fig. 1;
Fig. 4 is the explosive view of adopting in Fig. 1 according to case inner structure;
Fig. 5 is the local structural graph at A place in Fig. 4.
In Fig. 1,1 adopts according to case, 2 stationary base mounts, 3 sampling handles, 4 sample guide pipes, 5 actuating device of atmospheric pressure, 6 back shafts, 7 connecting rods, 8 casing fixed mounts; In Fig. 2,21 fixed base plates, 22 screw I, 23 travel switches, 24 screw II, 25 lubricated screws, 26 main backstops; In Fig. 3,51 connecting rods, 52 piston rods, 53 pneumatic cylinders, 54 pneumatic cylinder bases, 55 screw III, 56 bases, 57 pins, 58 nuts, 59 screw IV; In Fig. 4,11 upper box lids, 12 camera frames, 13 industrial cameras, 14 feeding gates, 15 cleaning brush holder supports, 16 monitor stations, 17 connecting rod V, 18 orienting sleeves, 19 connecting rod III, 110 connecting rod II, 111 connecting rod I, 112 shaft couplings, 113 motor fixing frames, 114 motors, 115 times case lids, 116 discharge doors, 117 Connection Blocks, 118 sphere lids, 119 spherical pair connecting rod I, 120 connecting rod IV, 121 locking caps, 122 torsion springs, 123 spherical pair connecting rod II, 124 cleaning brushing pieces, 125 cleaning brushing piece fixtures, 126 Spring hinge I, 127 casings, 128 Spring hinge II; In Fig. 5,15 cleaning brush holder supports, 16 monitor stations, 17 connecting rod V, 18 orienting sleeves, 19 connecting rod III, 110 connecting rod II, 111 connecting rod I, 112 shaft couplings, 113 motor fixing frames, 114 motors, 115 times case lids, 116 discharge doors, 117 Connection Blocks, 118 sphere lids, 119 spherical pair connecting rod I, 120 connecting rod IV, 121 locking caps, 122 torsion springs, 123 spherical pair connecting rod II, 124 cleaning brushing pieces, 125 cleaning brushing piece fixtures, 128 Spring hinge II.
Embodiment
A kind of particle collection and detection system; comprise the stationary base mount and the actuating device of atmospheric pressure that are arranged in automatic granulating machine cylinder; stationary base mount is provided with back shaft; back shaft is provided with casing fixed mount; casing fixed mount is provided with at least one and adopts according to case; back shaft is provided with sampling handle; sampling handle is corresponding with the position of adopting according to case; on sampling handle, be welded with sample guide pipe; rotarily drive sampling handle and sample guide pipe by back shaft move; realize the sampling of particle, adopt according in case and be provided with particle harvester camera and particle clearing apparatus.In conjunction with Fig. 1, Fig. 2, its stationary base mount 2 comprises fixed base plate 21, main backstop 26, screw I22, screw II24, travel switch 23, lubricated screw 25; Wherein fixed base plate 21 is fixedly connected with by screw I22 with automatic granulator; main backstop 26 is fixedly connected with by screw I22 with fixed base plate 21; travel switch 23 is fixedly connected on main backstop 26 by screw II24; back shaft 6 two ends respectively have a main backstop 26 to connect; realize the steadiness of mechanism; lubricated screw 25 is fixed on main backstop 26 and back shaft 6 junctions, and lubricating oil can enter by screw hole, lubricate.In conjunction with its actuating device of atmospheric pressure 5 of Fig. 1, Fig. 3, comprise base 56, screw III55, screw IV59, pneumatic cylinder 53, pneumatic cylinder base 54, piston rod 52, connecting rod 51, pin 57, nut 58; Wherein base 56 is fixedly connected with by screw III55 with granulating machine; pneumatic cylinder base 54 is connected by pin 57 with base 56; can make pneumatic cylinder base 54 along with pin 57 rotates; pneumatic cylinder base 54 is fixedly connected with by screw IV59 with pneumatic cylinder 53; piston rod 52 one end are connected to pneumatic cylinder 53 the insides and move reciprocatingly; the other end is connected with connecting rod 51, thereby drivening rod 51 swings around back shaft 6, finally by the range of movement of travel switch 23 control links 51.In conjunction with its particle harvester of Fig. 1, Fig. 4, comprise sampling handle 3, sample guide pipe 4; Sampling handle 3 and sample guide pipe 4 welding, sampling handle 3 is fixedly connected on back shaft 6, by back shaft 6 rotarily drive sampling handle 3 and sample guide pipe 4 motions, realize the sampling of particle.It is adopted according to case 1 and comprises upper box lid 11, lower case lid 115, casing 127, screw, feeding gate 14, Spring hinge I126; Upper box lid 11 and lower case lid 115 are separately fixed at the two ends up and down of casing 127, casing 16 is fixedly connected by welding on casing fixed mount 8, casing fixed mount 8 is fixedly connected with by screw with main backstop 26, and feeding gate 14 is fixedly connected on casing 127 by Spring hinge I126, screw.Its particle image harvester comprises industrial camera 13, camera frame 12, monitor station 16, screw; Camera frame 12 is fixedly connected on and is adopted according on the upper box lid 11 of case 1 by screw, industrial camera 13 is fixedly connected with by screw with camera frame 12, monitor station 16 is connected by screw to be fixed on and adopts according in case 1, and the particle of collection is entered and adopted according to case 1 by feeding gate, falls on monitor station 16 and detects.Its particle cleaning and driven unit thereof comprise cleaning brushing piece 124, cleaning brushing piece fixture 125, cleaning brush holder support 15, connecting rod I111, connecting rod II110, connecting rod III19, motor 114, motor fixing frame 113, shaft coupling 112; Motor fixing frame 113 is fixedly connected on monitor station 16 lower ends, motor 114 is fixedly connected on motor fixing frame 113 by screw, the output shaft of motor 114 is connected with connecting rod I111 by shaft coupling 112, connecting rod I111 is connected by revolute pair with connecting rod II110, connecting rod II110 is connected by revolute pair with connecting rod III19, connecting rod III19 is connected with cleaning brush holder support 15 through monitor station 16, and cleaning brush holder support 15 is connected with cleaning brushing piece 124 by cleaning brushing piece fixture 125.Its discharge door and driven unit thereof comprise discharge door 116, Spring hinge II128, Connection Block 117, sphere lid 118, spherical pair connecting rod I119, spherical pair connecting rod II123, screw, connecting rod IV120, locking cap 121, connecting rod V17, orienting sleeve 18, torsion spring 122; Discharge door 116 is connected to lower case lid 115 bottoms by Spring hinge II128 and screw, Connection Block 117 is fixedly connected on discharge door 116 by screw, spherical pair connecting rod I119 one end contact with Connection Block 117 and by sphere cover 118 and screw fix, the other end contact with spherical pair connecting rod II123 by sphere cover 118 and screw fix, form spherical pair and connect.Connecting rod IV120 is fixed on monitor station 16 bottoms by locking cap 121, and a torsion spring 122 is installed in the junction of connecting rod IV120 and monitor station 16.Connecting rod IV120 two ends are connected by revolute pair with connecting rod V17, spherical pair connecting rod II123 respectively.Orienting sleeve 18 is fixed by screws in monitor station 16 sides, and orienting sleeve 18 is used for control link V17 and moves along rectilinear direction.
The course of work of the present invention and principle are: when needs carry out particle collection, by control system to actuating device of atmospheric pressure 5 instructions, make piston rod 52 in pneumatic cylinder 53 stretch out 6 rotations of drive back shaft, thereby drive sampling handle 3 to gather particle, sample guide pipe 4 withstands feeding gate 14 in rotation simultaneously, the feeding gate 14 simultaneously particle that is opened drops on monitor station 16, piston rod 52 stretches out after a segment distance, connecting rod 7 contacts with travel switch 23, piston rod 52 stop motions, then control system makes piston rod 52 times to motion, drives sampling handle 3 to reset; Particle is fallen after monitor station 16, by industrial camera 13, it is taken pictures, and view data is transferred to PC end by data line and carries out Treatment Analysis.Then control system is to motor 114 energisings, after motor 114 work, drive the motion of particle clearing apparatus, wherein connecting rod I111, connecting rod II110, connecting rod III19 and frame form crank and rocker mechanism, thereby motor 114 single direction rotations drive cleaning brush holder support 15 to do reciprocal swing, with the contact movement of monitor station 16, the particle cleaning on monitor station 16 is clean by cleaning brushing piece 124; Particle falls into after lower case lid 115; when swinging to certain position, cleaning brush holder support 15 contacts with connecting rod V17; and oppress connecting rod V17 and move downward; due to lever principle; when connecting rod V17 declines, spherical pair connecting rod II123 rises; spherical pair connecting rod I119 rises discharge door 116 is raised, and the particle from monitor station 16 is swept is got back to granulating machine the inside by discharging opening.Also machine 114 is rotated further, under the connecting rod III19 of crank and rocker mechanism drives, clean brush holder support 15 and back move, after cleaning brush holder support 15 is separated with connecting rod V17, at the effect lower peripheral surface slave connecting rod II123 of torsion spring 122, decline, discharge door 116 is closed automatically, and connecting rod V17 resets.Fast detecting cylinder endoparticle size and shape feature of the present invention, effectively improves the production efficiency of granulation operation.
Claims (5)
1. a particle collection and detection system; it is characterized in that: comprise the stationary base mount and the actuating device of atmospheric pressure that are arranged in automatic granulating machine cylinder; stationary base mount is provided with back shaft; back shaft is provided with casing fixed mount; casing fixed mount is provided with at least one and adopts according to case, and back shaft is provided with sampling handle, and sampling handle is corresponding with the position of adopting according to case; on sampling handle, be welded with sample guide pipe, adopt according in case and be provided with particle harvester camera and particle clearing apparatus.
2. particle collection according to claim 1 and detection system, is characterized in that: described stationary base mount comprises the fixed base plate being fixed in automatic granulating machine cylinder, and fixed base plate is provided with main backstop, and main backstop is provided with travel switch.
3. particle collection according to claim 1 and detection system; it is characterized in that: described actuating device of atmospheric pressure comprises the base being fixed in automatic granulating machine cylinder; pneumatic cylinder base is installed on base, and pneumatic cylinder base is provided with pneumatic cylinder, and the piston rod in pneumatic cylinder is connected with connecting rod.
4. particle collection according to claim 1 and detection system, it is characterized in that: described in adopt according to being provided with particle harvester and particle clearing apparatus in case, adopt according to case and also comprise upper box lid, lower case lid, casing and feeding gate, upper box lid and lower case lid are separately fixed at the two ends up and down of casing, casing is fixedly connected by welding on casing fixed mount, and feeding gate is connected on casing; Particle image harvester comprises industrial camera, camera frame, monitor station, and camera frame is fixedly connected on to be adopted according on the upper box lid of case, and industrial camera is fixed on camera frame; Monitor station is fixed on to be adopted according in case.
5. particle collection according to claim 1 and detection system, is characterized in that: described particle clearing apparatus comprises cleaning brushing piece, cleaning brushing piece fixture, cleaning brush holder support, connecting rod I, connecting rod II, connecting rod III, motor, motor fixing frame, shaft coupling, discharge door, Spring hinge II, Connection Block, sphere lid, spherical pair connecting rod I, spherical pair connecting rod II, screw, connecting rod IV, locking cap, connecting rod V, orienting sleeve, torsion spring; Motor fixing frame is fixedly connected on monitor station lower end, motor is fixedly connected on motor fixing frame, the output shaft of motor is connected with connecting rod I by shaft coupling, connecting rod I is connected by revolute pair with connecting rod II, connecting rod II is connected by revolute pair with connecting rod III, connecting rod III is connected with cleaning brush holder support through monitor station, and cleaning brush holder support is connected with cleaning brushing piece by cleaning brushing piece fixture; Discharge door is arranged on lower case lid bottom, Connection Block is fixedly connected on discharge door, one end of spherical pair connecting rod I contacts with Connection Block and is covered with screw and fixed by sphere, the other end of spherical pair connecting rod I contacts with spherical pair connecting rod II by sphere and covers with screw and fix, connecting rod IV is fixed on monitor station bottom by locking cap, and a torsion spring is installed in the junction of connecting rod IV and monitor station.Connecting rod IV two ends are connected by revolute pair with connecting rod V, spherical pair connecting rod II respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310673621.1A CN104062210B (en) | 2013-12-13 | 2013-12-13 | Particle collection and detecting system |
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| CN201310673621.1A CN104062210B (en) | 2013-12-13 | 2013-12-13 | Particle collection and detecting system |
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| CN104062210A true CN104062210A (en) | 2014-09-24 |
| CN104062210B CN104062210B (en) | 2018-04-27 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634281A (en) * | 2015-02-15 | 2015-05-20 | 上海理工大学 | Drum machine and measuring method |
| CN105056831A (en) * | 2015-08-11 | 2015-11-18 | 安阳工学院 | Flat-die biomass pelletizer having on-line particle image analysis control function |
| CN105158128A (en) * | 2015-09-29 | 2015-12-16 | 浙江大学 | Particle diameter distribution online detecting device of granulating fluidized bed |
| CN105158127A (en) * | 2015-09-29 | 2015-12-16 | 浙江大学 | Pharmaceutical fluidized bed particle diameter distribution online detection device based on differential pressure sampling |
| CN107991142A (en) * | 2017-11-13 | 2018-05-04 | 华南农业大学 | It is a kind of to spray fog droplet acquisition device and its application method suitable for agricultural unmanned plane |
| CN108535159A (en) * | 2018-03-30 | 2018-09-14 | 重庆山楂树科技有限公司 | A kind of dust concentration detection device |
| CN108693086A (en) * | 2018-03-30 | 2018-10-23 | 重庆山楂树科技有限公司 | A kind of equipment of detection dust in air concentration |
| CN108956396A (en) * | 2018-03-23 | 2018-12-07 | 重庆山楂树科技有限公司 | Dust detects purification device |
| CN109200946A (en) * | 2017-07-05 | 2019-01-15 | 中冶长天国际工程有限责任公司 | A kind of pelletizer balling ratio detection method and system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634281A (en) * | 2015-02-15 | 2015-05-20 | 上海理工大学 | Drum machine and measuring method |
| CN105056831A (en) * | 2015-08-11 | 2015-11-18 | 安阳工学院 | Flat-die biomass pelletizer having on-line particle image analysis control function |
| CN105158128A (en) * | 2015-09-29 | 2015-12-16 | 浙江大学 | Particle diameter distribution online detecting device of granulating fluidized bed |
| CN105158127A (en) * | 2015-09-29 | 2015-12-16 | 浙江大学 | Pharmaceutical fluidized bed particle diameter distribution online detection device based on differential pressure sampling |
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| CN109200946A (en) * | 2017-07-05 | 2019-01-15 | 中冶长天国际工程有限责任公司 | A kind of pelletizer balling ratio detection method and system |
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| CN108956396A (en) * | 2018-03-23 | 2018-12-07 | 重庆山楂树科技有限公司 | Dust detects purification device |
| CN108956396B (en) * | 2018-03-23 | 2020-06-02 | 重庆山楂树科技有限公司 | Dust detection and purification device |
| CN108693086A (en) * | 2018-03-30 | 2018-10-23 | 重庆山楂树科技有限公司 | A kind of equipment of detection dust in air concentration |
| CN108535159A (en) * | 2018-03-30 | 2018-09-14 | 重庆山楂树科技有限公司 | A kind of dust concentration detection device |
| CN108693086B (en) * | 2018-03-30 | 2020-06-30 | 重庆山楂树科技有限公司 | Equipment for detecting dust concentration in air |
| CN108535159B (en) * | 2018-03-30 | 2020-06-30 | 重庆山楂树科技有限公司 | Dust concentration detection equipment |
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Granted publication date: 20180427 Termination date: 20211213 |