CN215430787U - Environment-friendly chemical machinery waste residue collecting device - Google Patents

Environment-friendly chemical machinery waste residue collecting device Download PDF

Info

Publication number
CN215430787U
CN215430787U CN202121995980.5U CN202121995980U CN215430787U CN 215430787 U CN215430787 U CN 215430787U CN 202121995980 U CN202121995980 U CN 202121995980U CN 215430787 U CN215430787 U CN 215430787U
Authority
CN
China
Prior art keywords
crushing
bottom plate
waste residue
component
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN202121995980.5U
Other languages
Chinese (zh)
Inventor
谭卫娣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202121995980.5U priority Critical patent/CN215430787U/en
Application granted granted Critical
Publication of CN215430787U publication Critical patent/CN215430787U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Processing Of Solid Wastes (AREA)

Abstract

The utility model discloses an environment-friendly chemical machinery waste residue collecting device, which relates to the technical field of industrial waste residues and comprises a bottom plate, an upper storage bin, a shaking component, a conveyor belt, a crushing component, a rotating component and an extrusion component, wherein the bottom plate is provided with a drainage groove, the upper storage bin is arranged at the top end of the bottom plate and is provided with an inlet and an outlet, the shaking component is arranged at the lower end of the inlet and is positioned above the bottom plate, the conveyor belt is arranged on the bottom plate, the feeding end of the conveyor belt is positioned below the shaking component, the crushing component is arranged on the bottom plate and is positioned below the discharging end of the conveyor belt, the crushing component is provided with an automatic opening and closing component, the rotating component is arranged in the drainage groove on the bottom plate and is positioned below the crushing component, the extrusion component is arranged on the bottom plate and is positioned beside the rotating component, and excessive waste residues can be prevented from being poured into the crushing component through the utility model, so that the waste residue can not block the equipment.

Description

Environment-friendly chemical machinery waste residue collecting device
Technical Field
The utility model relates to the technical field of industrial waste residues, in particular to an environment-friendly chemical machinery waste residue collecting device.
Background
The chemical waste residue refers to solid and slurry waste generated in the chemical industrial production process. Including unqualified products produced in the chemical production process, unsolvable byproducts, reaction kettle bottom materials, filter cake residues, waste catalysts and the like.
When the collecting device is poured into equipment with the waste residue among the prior art, handle in pouring the equipment into with the waste residue intermittent and continuous by the manual work usually, make the waste residue quantity that personnel poured into at every turn different, and when pouring too much waste residue, make the waste residue can block equipment easily, make equipment unable operation, and influence follow-up to waste residue treatment.
SUMMERY OF THE UTILITY MODEL
The utility model provides an environment-friendly chemical machinery waste residue collecting device, which aims to solve the technical problem that when too much waste residue is poured in the prior art, the waste residue is easy to clamp equipment, so that the equipment cannot run, and the subsequent waste residue treatment is influenced.
The utility model provides an environment-friendly chemical machinery waste residue collecting device which comprises a bottom plate, an upper storage bin, a shaking component, a conveyor belt, a crushing component, a rotating component and an extruding component, wherein a drainage groove is formed in the bottom plate, the upper storage bin is arranged at the top end of the bottom plate, an inlet and an outlet are formed in the upper storage bin, the shaking component is arranged at the lower end of the inlet and located above the bottom plate, the conveyor belt is arranged on the bottom plate, the feeding end of the conveyor belt is located below the shaking component, the crushing component is arranged on the bottom plate and located below the discharging end of the conveyor belt, an automatic opening and closing component is arranged on the crushing component, the rotating component is arranged in the drainage groove in the bottom plate and located below the crushing component, and the extruding component is arranged on the bottom plate and located beside the rotating component.
Further, the shaking assembly comprises a support, a double-shaft motor, a shaking plate, a plurality of first connecting rods, a plurality of second connecting rods and a plurality of third connecting rods, the support is mounted on the bottom plate and fixedly connected with the upper bin, the double-shaft motor is fixedly mounted on the support and positioned beside the upper bin, the shaking plate is mounted below the outlet of the upper bin, the first connecting rods are symmetrically mounted on two sides of the shaking plate one by one, one end of each first connecting rod is hinged with the upper bin, the other end of each first connecting rod is hinged with the shaking plate, the second connecting rods are two, the two second connecting rods are symmetrically mounted on two sides of the shaking plate and positioned beside the first connecting rods, one end of each second connecting rod is hinged to the shaking plate, the third connecting rods are two and respectively mounted on two sides of the double-shaft motor, and one ends of the two third connecting rods are respectively fixedly connected with two output ends of the double-shaft motor, and the other ends of the two third connecting rods are respectively connected with the other ends of the two second connecting rods through pins.
Further, crushing unit is including smashing box, crushing roller, belt pulley, crushing motor crushing box is located the unloading end of conveyer belt, crushing roller is equipped with two, and two crushing roller symmetries are installed in smashing the box to all install a plurality of on every crushing roller and smash the cutter, the belt pulley is equipped with two, and two belt pulleys are installed respectively on two crushing rollers and are located the lateral wall of smashing the box, and two belt pulleys are connected by the belt, crushing motor installs on another lateral wall of smashing the box and its output passes and smashes box and two crushing roller in one and smash the roller and be connected.
Further, the runner assembly includes the carousel, rotates the motor and retrieves the box, the carousel is installed in the drainage inslot, it passes the bottom plate and is connected with the carousel to rotate the motor and install the lower extreme at the bottom plate and its output, it is equipped with four to retrieve the box, and four are retrieved the box and are two bisymmetry and install on the carousel, and every two intervals of retrieving between the box are ninety degrees to all be equipped with a plurality of filtration pore on every retrieves the box.
Further, the extrusion subassembly includes mount, extrusion cylinder and stripper plate, the mount is located one side of carousel, extrusion cylinder installs the top at the mount and its output passes the mount, the stripper plate is connected with extrusion cylinder's output and is located the top of carousel.
Furthermore, a baffle is arranged at the feeding end of the conveyor belt, and a guide plate is arranged at the discharging end of the conveyor belt.
The utility model provides an environment-friendly chemical machinery waste residue collecting device through improvement, and compared with the prior art, the environment-friendly chemical machinery waste residue collecting device has the following improvements and advantages:
(1) when the slag-removing device is used, when the slag falls onto the shaking plate, the double-shaft motor is started to respectively drive the two third connecting rods to rotate, then one end of each third connecting rod drives the second connecting rod to rotate, so that the second connecting rod makes circular motion around the third connecting rod, then when one end of the second connecting rod rotates, the other end of the second connecting rod drives the shaking plate to shake back and forth, so that waste residues on the shaking plate can be more uniformly laid on the conveyor belt, and the first connecting rod can provide a more stable working environment for the second connecting rod when the shaking plate shakes, then in can be sustainably evenly carrying crushing unit with the waste residue by the conveyer belt to need not by artifical material loading, can not appear throwing into crushing unit or once throwing into too much waste residue with the waste residue on an intermittent basis, lead to the waste residue can block crushing unit, make crushing unit unable operation and influence follow-up to the waste residue treatment.
(2) When the recovery box moves below the extrusion plate during use, the extrusion cylinder is started to push the extrusion plate to extrude waste residues in the recovery box, so that liquid in the waste residues is discharged from the filter holes and falls into the drainage grooves, and then the liquid is discharged from the drainage grooves, and solid-liquid separation of the waste residues is completed, thereby facilitating subsequent collection and treatment of the waste residues.
(3) When the slag crusher is used, the swinging plate can move the waste slag to the conveying belt through the baffle plate, the waste slag is prevented from falling out of the conveying belt to influence the treatment of the waste slag, and the conveying belt can more accurately move the waste slag to the crushing box through the guide plate, so that the waste slag is prevented from moving out of the crushing box.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a perspective elevation view of the present invention;
FIG. 3 is a schematic view of a partial structure of a wobble structure according to the present invention;
FIG. 4 is a schematic view of a portion of the shredder assembly of the present invention;
FIG. 5 is a schematic view of the rotating assembly and the compressing assembly according to the present invention.
Description of reference numerals:
the device comprises a bottom plate 1, a drainage groove 11, an upper bin 2, a shaking assembly 3, a support 31, a double-shaft motor 32, a shaking plate 33, a first connecting rod 34, a second connecting rod 35, a third connecting rod 36, a conveyor belt 4, a baffle plate 41, a guide plate 42, a crushing assembly 5, a crushing box 51, a crushing roller 52, a belt pulley 53, a crushing motor 54, a rotating assembly 6, a turntable 61, a rotating motor 62, a recovery box 63, an extrusion assembly 7, a fixed frame 71, an extrusion cylinder 72 and an extrusion plate 73.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 5, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model provides an environment-friendly chemical machinery waste residue collecting device through improvement, which comprises a bottom plate 1, an upper bin 2, a shaking component 3, a conveyor belt 4, a crushing component 5, a rotating component 6 and an extrusion component 7, wherein the bottom plate 1 is provided with a drainage groove 11, the upper bin 2 is arranged at the top end of the bottom plate 1, the upper bin 2 is provided with an inlet and an outlet, the shaking component 3 is arranged at the lower end of the inlet and is positioned above the bottom plate 1, the conveyor belt 4 is arranged on the bottom plate 1, the feeding end of the conveyor belt 4 is positioned below the shaking component 3, the crushing component 5 is arranged on the bottom plate 1 and is positioned below the discharging end of the conveyor belt 4, the crushing component 5 is provided with an automatic opening and closing component, the rotating component 6 is arranged in the drainage groove 11 on the bottom plate 1 and is positioned below the crushing component 5, the extrusion component 7 is arranged on the bottom plate 1 and is positioned beside the rotating component 6, when in use, the waste residue is poured into the upper material bin 2, the waste residue falls onto the shaking component 3 along the outlet of the upper material bin 2, the waste residue can be moved to the conveyor belt 4 by shaking the waste residue on the shaking component 3 continuously, the waste residue can be uniformly laid on the conveyor belt 4 by shaking the shaking component 3, then the waste residue can be continuously and uniformly conveyed into the crushing component 5 by the conveyor belt 4, so that the waste residue can be continuously fed into the crushing component 5 or fed into too much waste residue once without manual feeding, the equipment can be blocked by the waste residue, the equipment can not operate to influence the subsequent treatment of the waste residue, the waste residue is crushed by the crushing component 5, the crushed waste residue is moved to the lower part of the extrusion component 7 by the rotating component 6, the waste residue is extruded by the extrusion component 7, and the liquid in the waste residue flows into the drainage groove 11 from the rotating component 6, liquid is discharged along the drainage groove 11, solid-liquid separation of the waste residue is completed, and therefore subsequent collection and treatment of the waste residue are facilitated.
Preferably, the shaking assembly 3 comprises a support 31, a double-shaft motor 32, a shaking plate 33, a first connecting rod 34, a second connecting rod 35 and a third connecting rod 36, the support 31 is mounted on the bottom plate 1 and fixedly connected with the upper bin 2, the double-shaft motor 32 is fixedly mounted on the support 31 and positioned beside the upper bin 2, the shaking plate 33 is mounted below the outlet of the upper bin 2, the first connecting rods 34 are provided in plurality, the first connecting rods 34 are respectively mounted on two sides of the shaking plate 33 in a one-to-one symmetrical manner, one end of each first connecting rod 34 is hinged with the upper bin 2, the other end of each first connecting rod 34 is hinged with the shaking plate 33, the second connecting rods 35 are provided in two, two second connecting rods 35 are symmetrically mounted on two sides of the shaking plate 33 and positioned beside the first connecting rods 34, one end of each second connecting rod 35 is hinged with the shaking plate 33, the third connecting rods 36 are provided in two, two third connecting rods 36 are respectively arranged at two sides of the double-shaft motor 32, one end of each of the two third connecting rods 36 is respectively fixedly connected with two output ends of the double-shaft motor 32, the other end of each of the two third connecting rods 36 is respectively connected with the other end of each of the two second connecting rods 35 through a pin, when the slag falls onto the swinging plate 33 in use, the double-shaft motor 32 is started to respectively drive the two third connecting rods 36 to rotate, one end of each of the three third connecting rods 36 drives the second connecting rod 35 to rotate, so that the second connecting rod 35 surrounds the third connecting rod 36 to do circular motion, then one end of each of the second connecting rods 35 drives the swinging plate 33 to swing back and forth, the slag on the swinging plate 33 can be more uniformly laid on the conveyor belt 4, the first connecting rod 34 can provide a more stable working environment for the second connecting rod 35 to swing the swinging plate 33, and then the conveyor belt 4 can uniformly convey the slag into the crushing assembly 5, therefore, manual feeding is not needed, and the situation that the crushing assembly 5 is clamped by waste residues due to intermittent feeding of the waste residues into the crushing assembly 5 or excessive waste residues are fed at one time can be avoided, so that the crushing assembly 5 cannot run to influence subsequent waste residue treatment; the crushing assembly 5 comprises a crushing box 51, two crushing rollers 52, belt pulleys 53, a crushing motor 54, wherein the crushing box 51 is positioned at the blanking end of the conveyor belt 4, the two crushing rollers 52 are arranged, the two crushing rollers 52 are symmetrically arranged in the crushing box 51, each crushing roller 52 is provided with a plurality of crushing cutters, the two belt pulleys 53 are respectively arranged on the two crushing rollers 52 and positioned on the side wall of the crushing box 51, the two belt pulleys 53 are connected by a belt, the crushing motor 54 is arranged on the other side wall of the crushing box 51, the output end of the crushing motor passes through the crushing box 51 and is connected with one crushing roller 52 of the two crushing rollers 52, when waste residues fall into the crushing box 51 during use, the crushing motor 54 is started to drive the crushing rollers 52 to rotate, and under the matching between the belt pulleys 53 and the belt, the crushing cutters on the other crushing roller 52 rotate together to crush the waste residues, the crush box 51 is then sealed by the auto-close assembly so that crushed waste residue is temporarily stored in the crush box 51.
Preferably, the rotating assembly 6 comprises a rotating disc 61, a rotating motor 62 and four recovery boxes 63, the rotating disc 61 is installed in the drainage groove 11, the rotating motor 62 is installed at the lower end of the bottom plate 1, the output end of the rotating motor passes through the bottom plate 1 and is connected with the rotating disc 61, the four recovery boxes 63 are installed on the rotating disc 61 in a pairwise symmetry manner, the interval between every two recovery boxes 63 is ninety degrees, and each recovery box 63 is provided with a plurality of filtering holes; the extrusion assembly 7 comprises a fixed frame 71, an extrusion air cylinder 72 and an extrusion plate 73, the fixed frame 71 is positioned on one side of the rotary table 61, the extrusion air cylinder 72 is installed at the top end of the fixed frame 71, the output end of the extrusion air cylinder 72 penetrates through the fixed frame 71, the extrusion plate 73 is connected with the output end of the extrusion air cylinder 72 and positioned above the rotary table 61, when the extrusion assembly is used, the rotary motor 62 is started to drive the rotary table 61 to rotate ninety degrees every time, so that the recovery box 63 on the rotary table 61 can accurately move to the lower part of the crushing box 51, then the automatic opening and closing assembly is opened, so that waste residues temporarily stored in the crushing box 51 fall into the recovery box 63, and then the rotary motor 62 drives the rotary table 61 to rotate, so that the rotary table 61 moves the recovery box 63 to the lower part of the extrusion assembly 7; when the recovery box 63 moves below the extrusion plate 73, the extrusion cylinder 72 is started to push the extrusion plate 73 to extrude the waste residues in the recovery box 63, so that the liquid in the waste residues is discharged from the filter holes and falls into the drainage groove 11, and then the liquid is discharged from the drainage groove 11, thereby completing solid-liquid separation of the waste residues, and further facilitating the subsequent collection and treatment of the waste residues; install baffle 41 on the material loading of conveyer belt 4, and install guide plate 42 on the unloading of conveyer belt 4 holds, can make through baffle 41 shake when board 33 removes the waste residue to conveyer belt 4, prevent that the waste residue from dropping outside conveyer belt 4, the influence is handled the waste residue, and rethread guide plate 42 can make conveyer belt 4 more accurate remove the waste residue to smash the box 51 in, prevent that the waste residue can shift out outside smashing the box 51.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. The utility model provides an environmental protection chemical machinery waste residue collection device, includes the automatic subassembly that opens and shuts, its characterized in that still includes bottom plate (1), goes up feed bin (2), rocks subassembly (3), conveyer belt (4), crushing unit (5), runner assembly (6) and extrusion subassembly (7), be equipped with drainage groove (11) on bottom plate (1), go up feed bin (2) and set up on bottom plate (1) top, and go up and be equipped with import and export on feed bin (2), it installs at the lower extreme of import and is located the top of bottom plate (1) to rock subassembly (3), conveyer belt (4) are installed on bottom plate (1), and the material loading end of conveyer belt (4) is located the below of rocking subassembly (3), crushing unit (5) are installed on bottom plate (1) and are located the below of conveyer belt (4) unloading end to be equipped with the automatic subassembly that opens and shuts on crushing unit (5), the rotating assembly (6) is installed in a drainage groove (11) on the bottom plate (1) and is located below the crushing assembly (5), and the extruding assembly (7) is installed on the bottom plate (1) and is located beside the rotating assembly (6).
2. The environment-friendly chemical machinery waste residue collecting device according to claim 1, wherein the shaking assembly (3) comprises a support (31), a double-shaft motor (32), a shaking plate (33), a first connecting rod (34), a second connecting rod (35) and a third connecting rod (36), the support (31) is installed on the bottom plate (1) and is fixedly connected with the upper bin (2), the double-shaft motor (32) is fixedly installed on the support (31) and is positioned at the side of the upper bin (2), the shaking plate (33) is installed below the outlet of the upper bin (2), the first connecting rods (34) are provided in plurality, the first connecting rods (34) are respectively installed at two sides of the shaking plate (33) in a one-to-one symmetry manner, one end of each first connecting rod (34) is hinged to the upper bin (2) while the other end thereof is hinged to the shaking plate (33), the second connecting rods (35) are provided in number of two, two second connecting rods (35) are symmetrically arranged on two sides of the shaking plate (33) and positioned at the lateral side of the first connecting rod (34), one end of each second connecting rod (35) is hinged to the shaking plate (33), two third connecting rods (36) are arranged, the two third connecting rods (36) are respectively arranged on two sides of the double-shaft motor (32), one ends of the two third connecting rods (36) are respectively fixedly connected with two output ends of the double-shaft motor (32), and the other ends of the two third connecting rods (36) are respectively in pin connection with the other ends of the two second connecting rods (35).
3. The environmental protection chemical machinery waste residue collecting device according to claim 1, the crushing assembly (5) comprises a crushing box (51), a crushing roller (52), a belt pulley (53) and a crushing motor (54), the crushing box (51) is positioned at the discharging end of the conveyor belt (4), the two crushing rollers (52) are arranged, the two crushing rollers (52) are symmetrically arranged in the crushing box (51), and each crushing roller (52) is provided with a plurality of crushing cutters, two belt pulleys (53) are arranged, the two belt pulleys (53) are respectively arranged on the two crushing rollers (52) and positioned on the side wall of the crushing box (51), and the two belt pulleys (53) are connected by a belt, the crushing motor (54) is installed on the other side wall of the crushing box (51) and the output end of the crushing motor penetrates through the crushing box (51) to be connected with one crushing roller (52) of the two crushing rollers (52).
4. The environment-friendly chemical machinery waste residue collecting device according to claim 1, wherein the rotating assembly (6) comprises a turntable (61), a rotating motor (62) and a recovery box (63), the turntable (61) is installed in the drainage groove (11), the rotating motor (62) is installed at the lower end of the bottom plate (1) and the output end of the rotating motor passes through the bottom plate (1) to be connected with the turntable (61), the recovery box (63) is provided with four, the four recovery boxes (63) are installed on the turntable (61) in pairwise symmetry, the distance between every two recovery boxes (63) is ninety degrees, and each recovery box (63) is provided with a plurality of filtering holes.
5. The environmental protection chemical machinery waste residue collection device of claim 4, wherein the extrusion assembly (7) comprises a fixing frame (71), an extrusion cylinder (72) and an extrusion plate (73), the fixing frame (71) is located at one side of the turntable (61), the extrusion cylinder (72) is installed at the top end of the fixing frame (71) and the output end of the extrusion cylinder (72) penetrates through the fixing frame (71), and the extrusion plate (73) is connected with the output end of the extrusion cylinder (72) and located above the turntable (61).
6. The environmental-friendly chemical machinery waste residue collecting device according to claim 1, wherein the feeding end of the conveyor belt (4) is provided with a baffle (41), and the discharging end of the conveyor belt (4) is provided with a guide plate (42).
CN202121995980.5U 2021-08-23 2021-08-23 Environment-friendly chemical machinery waste residue collecting device Expired - Fee Related CN215430787U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121995980.5U CN215430787U (en) 2021-08-23 2021-08-23 Environment-friendly chemical machinery waste residue collecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121995980.5U CN215430787U (en) 2021-08-23 2021-08-23 Environment-friendly chemical machinery waste residue collecting device

Publications (1)

Publication Number Publication Date
CN215430787U true CN215430787U (en) 2022-01-07

Family

ID=79696083

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202121995980.5U Expired - Fee Related CN215430787U (en) 2021-08-23 2021-08-23 Environment-friendly chemical machinery waste residue collecting device

Country Status (1)

Country Link
CN (1) CN215430787U (en)

Similar Documents

Publication Publication Date Title
CN212189438U (en) Cylinder rotary crushing and screening device
CN108357026A (en) A kind of waste plastic crushing and collecting device
CN113601248A (en) Numerical control machine tool with scrap disposal function
CN109604163B (en) Plastic particle screening device
CN216683473U (en) Metal filing shredding extruder
CN113244999B (en) Screening device for recovering non-fired refractory brick material
CN215430787U (en) Environment-friendly chemical machinery waste residue collecting device
CN207930918U (en) Waste recycling device
CN113998851A (en) Green cyclic utilization system of river silt
CN111085327A (en) Biomass pellet fuel production line
CN211945405U (en) Broken bag feeding system
CN114888032A (en) Kitchen waste pulping and dewatering equipment
CN210552664U (en) Plastic powder loading attachment for injection molding machine
CN113117601A (en) Zinc oxide powder granulator
CN215151284U (en) Discharging device of injection molding machine
CN219543865U (en) Plastic bottle production equipment
CN221413857U (en) Pulverized coal screening device
CN213382399U (en) Polymer material prilling granulator
CN216230228U (en) Granulator is used in plastic granules production
CN211807170U (en) Plastic packaging product reprocessing device capable of reducing environmental pollution
CN216678143U (en) Efficient granulator for feed processing
CN221186702U (en) Slicing device is concocted to traditional chinese medicine decoction piece
CN214514833U (en) A raw materials reducing mechanism for production of fiber cement board
CN218194014U (en) A sweeps collection device for digit control machine tool
CN219028130U (en) Crushing and screening device for plastic recycling and processing

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20220107

CF01 Termination of patent right due to non-payment of annual fee