CN210365527U - Hoisting machine - Google Patents

Hoisting machine Download PDF

Info

Publication number
CN210365527U
CN210365527U CN201920754884.8U CN201920754884U CN210365527U CN 210365527 U CN210365527 U CN 210365527U CN 201920754884 U CN201920754884 U CN 201920754884U CN 210365527 U CN210365527 U CN 210365527U
Authority
CN
China
Prior art keywords
body shell
lifting
ladder
machine body
lead screw
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
CN201920754884.8U
Other languages
Chinese (zh)
Inventor
刘国福
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.)
Jiangsu Huaye Calcium Industry Co ltd
Original Assignee
Jiangsu Huaye Calcium Industry Co ltd
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 Jiangsu Huaye Calcium Industry Co ltd filed Critical Jiangsu Huaye Calcium Industry Co ltd
Priority to CN201920754884.8U priority Critical patent/CN210365527U/en
Application granted granted Critical
Publication of CN210365527U publication Critical patent/CN210365527U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Forklifts And Lifting Vehicles (AREA)

Abstract

The utility model relates to the technical field of conveying devices, and aims to provide a lifting machine, which has the technical scheme that the lifting machine comprises a machine body shell, a lifting motor arranged on the machine body shell and a ladder stand, wherein the ladder stand comprises a rotating shaft, a ladder frame, a pedal and a first lifting device used for driving the rotating shaft to move in the vertical direction, the first lifting device is arranged on the machine body shell, the rotating shaft is connected with the output end of the first lifting device, the ladder frame is rotationally connected with the rotating shaft, and the pedal is arranged on the ladder frame; this kind of lifting machine self has the cat ladder, if the lift motor breaks down, and the maintainer need not carry the ladder to engine body shell department, can directly climb to lift motor department through the cat ladder and overhaul the lift motor, saves time.

Description

Hoisting machine
Technical Field
The utility model relates to a conveyor's technical field, in particular to lifting machine.
Background
Quicklime (also called marble), the chemical formula CaO, is a common inorganic compound. The natural rock whose main component is calcium carbonate is calcined at high temp. to decompose it into carbon dioxide and calcium oxide. In the production process of calcium oxide, stones containing calcium carbonate as a raw material and coal as a fuel are mixed together and calcined, and the mixed stones and coal are generally conveyed to a calcining device by an elevator before calcination.
Chinese patent No. CN204453683U discloses a novel bucket elevator, which comprises a base, a self-locking wheel, a partition plate, an elevator bucket, a lifting device, a discharging pipe, a dust collection head, a dust collection pipe, a dust collection fan, a belt, a lifting motor, a motor cover, a fixed transverse plate, a feeding port and a machine body shell, and is characterized in that the self-locking wheel is arranged below the base, the machine body shell is arranged above the base, the lifting device is arranged on the inner side of the machine body shell, the elevator bucket is arranged on the lifting device, the partition plate is arranged at the lower end of the lifting device, the feeding port is arranged on the outer wall of the left side of the machine body shell, the fixed transverse plate is arranged above the feeding port, the lifting motor is arranged above the fixed transverse plate, the motor cover is arranged on the outer side of the lifting motor, the belt is arranged on the lifting, the upper end of the dust collection head is provided with a dust collection pipe, and the left end of the dust collection pipe is connected with a dust collection fan.
This kind of bucket elevator's lifting motor sets up the higher department through fixed diaphragm setting at the engine body shell, if the lifting motor breaks down, needs maintainer to carry the ladder to engine body shell department, climbs lifting motor department again and overhauls lifting motor, the waste time.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a lifting machine, its self has the cat ladder, if promote the motor and break down, the maintainer need not carry the ladder to engine body shell department, can directly climb to promotion motor department through the cat ladder and overhaul the promotion motor, saves time.
The above technical purpose of the present invention can be achieved by the following technical solutions:
the utility model provides a lifting machine, includes engine body shell and the promotion motor of setting on engine body shell, still includes the cat ladder, the cat ladder includes pivot, ladder frame, footboard and is used for driving the first elevating gear of pivot removal in vertical direction, first elevating gear sets up on engine body shell, the pivot is connected in first elevating gear's output, ladder frame rotates with the pivot to be connected, the footboard sets up on ladder frame.
Through adopting above-mentioned technical scheme, if promote the motor and break down, lift up the ladder frame, the ladder frame revolutes the rotation of axes, starts first elevating gear, and first elevating gear drives the pivot orientation and removes near the ground direction, puts down the ladder frame, and the ladder frame is the tilt state, and maintainer directly walks to the eminence through the footboard and overhauls the promotion motor, does not need maintainer transport ladder to engine body shell department, saves time.
Further setting: the first lifting device comprises a support, a cylinder and a lifting block, the support is arranged on the machine body shell, a groove is formed in the support, the cylinder is arranged in the groove, the lifting block is arranged on a piston rod of the cylinder, and two ends of the rotating shaft are connected with the lifting block.
By adopting the technical scheme, when the ladder stand is used, the ladder stand is lifted, the cylinder is started, the cylinder drives the lifting block to move towards the direction close to the ground, the rotating shaft moves along with the lifting block to put down the ladder stand, so that the ladder stand is in an inclined state, and the ladder stand is put down at the moment; when not using the cat ladder, the cylinder drives the pivot orientation through the elevator and deviates from the ground direction and removes, removes the in-process at the pivot, and the degree of slope of ladder frame changes, is vertical state until ladder frame, and the pivot stop movement, the cat ladder was in the state of packing up this moment.
Further setting: the lifting device is characterized in that a guide groove is formed in the side wall of the groove, a guide block is arranged on the lifting block, and the guide block is in sliding fit with the guide groove.
Through adopting above-mentioned technical scheme, at the elevator removal in-process, the guide block slides along the guide way to guide the moving direction of elevator, improved the stability of elevator at the removal in-process.
Further setting: the machine body shell is further provided with a conveying plate and a second lifting device used for driving the conveying plate to move in the vertical direction, the conveying plate is in sliding fit with the machine body shell, the second lifting device is arranged on the machine body shell, and the output end of the second lifting device is connected with the conveying plate.
By adopting the technical scheme, on one hand, a maintainer can place a maintenance tool on the conveying plate and lift the conveying plate to a high position by the second lifting device, so that the burden of the maintainer on the ladder stand is reduced; on the other hand, if need dismantle the promotion motor and get off and maintain, the maintainer can be with placing the delivery board after the promotion motor is dismantled, transport the low department from the eminence with the delivery board by second elevating gear, will promote the motor and take off from the delivery board again, replace the maintainer and carry the promotion motor, avoid the maintainer speed of cat ladder down to receive the influence, save time.
Further setting: the second lifting device comprises a lifting motor, a lead screw, a nut block and a guide rod, the lead screw is rotatably connected with the machine body shell, the lifting motor is arranged on the machine body shell and is linked with the lead screw, the nut block is screwed on the lead screw, the guide rod is arranged on the machine body shell and penetrates through the nut block, and the conveying plate is arranged on the nut block.
Through adopting above-mentioned technical scheme, elevator motor drives the lead screw and rotates under operating condition, and the lead screw drives the nut piece and removes at the rotation in-process, and the delivery board removes along with the nut piece to realize the purpose that the drive delivery board removed.
Further setting: the lead screw is connected with the lifting motor through a speed reducing component, the speed reducing component comprises a driving gear and a driven gear, the driving gear is arranged on the lifting motor, the driven gear is arranged on the lead screw, the driving gear is smaller than the driven gear, and the driving gear is meshed with the driven gear.
Through adopting above-mentioned technical scheme, the setting of speed reduction component can make the lead screw rotate with slower speed to make the nut piece remove with slower speed, the delivery board removes along with the nut piece together, thereby improved the stability of delivery board in the removal process.
Further setting: and the edge of the conveying plate is provided with a limiting plate.
Through adopting above-mentioned technical scheme, the setting up of limiting plate can carry on spacingly to the maintenance instrument of placing on the delivery board or promotion motor to reduced and overhauld the instrument or promoted the possibility that the motor dropped from the delivery board.
Further setting: the conveying plate is detachably connected with the nut block.
Through adopting above-mentioned technical scheme, if the delivery board is damaged in the use, then can dismantle the delivery board that damages and change new delivery board to the transport work can continue to go on.
Further setting: still include the bottom plate, engine body shell sets up on the bottom plate, the support conflicts the bottom plate, the ladder frame is in conflict bottom plate when putting down the state.
Through adopting above-mentioned technical scheme, when using the cat ladder, lift up the ladder frame and put down the back, can make the one end conflict bottom plate that the ladder frame deviates from the pivot, conflict in unevenness's place with the one end that the ladder frame deviates from the pivot and compare, the stability that can improve the ladder frame is set up to the bottom plate, has reduced the ladder frame and has appeared the possibility of rocking the phenomenon.
Further setting: the pedal is provided with an anti-skid bump.
Through adopting above-mentioned technical scheme, the frictional force that the maintainer received on the footboard can be walked in increase in the setting of anti-skidding lug to the gliding possibility of maintainer on the footboard has been reduced.
To sum up, the utility model discloses following beneficial effect has:
1. if the lifting motor fails, the ladder frame is lifted up, the ladder frame rotates around the rotating shaft, the first lifting device is started, the rotating shaft is driven by the first lifting device to move towards the direction close to the ground, the ladder frame is put down, the ladder frame is in an inclined state, and a maintainer directly walks to a high place through the pedal to overhaul the lifting motor without carrying the ladder to the machine body shell, so that the time is saved;
2. the maintenance personnel can place the maintenance tool on the conveying plate, and the conveying plate is lifted to a high position by the second lifting device, so that the burden of the maintenance personnel on the ladder stand is reduced;
3. if the conveying plate is damaged in the using process, the damaged conveying plate can be detached and replaced by a new conveying plate, so that the conveying work can be continued.
Drawings
Fig. 1 is a schematic structural diagram for embodying the present invention in the present embodiment;
FIG. 2 is a schematic structural diagram of the present embodiment for embodying the transmission assembly;
FIG. 3 is a schematic structural diagram for showing a positional relationship between a material inlet and a material outlet in the present embodiment;
FIG. 4 is an enlarged view of the portion A of FIG. 1 for showing the positional relationship between the guide groove and the guide block;
fig. 5 is a schematic structural diagram for embodying the second lifting device in the present embodiment;
FIG. 6 is an enlarged view of the portion B of FIG. 5 for showing the positional relationship between the slide block and the slide groove;
fig. 7 is an enlarged view of a portion C of fig. 5 for embodying the decelerating members.
In the figure, 1, a bottom plate; 2. a body housing; 3. a hoisting motor; 4. a drive shaft; 5. a driven shaft; 6. a sprocket; 7. a chain; 8. a hopper; 9. climbing a ladder; 10. a conveying plate; 22. a second lifting device; 23. connecting sheets; 24. a support plate; 25. a transmission assembly; 26. a driving wheel; 27. a driven wheel; 28. a belt; 29. a transmission frame; 30. a drive shaft; 31. a rotating shaft; 32. a ladder frame; 33. a pedal; 34. a first lifting device; 35. a support; 36. a cylinder; 37. a lifting block; 38. a groove; 39. a guide groove; 40. a guide block; 41. an anti-slip bump; 42. a slider; 43. a sliding groove; 44. a limiting plate; 45. a lifting motor; 46. a lead screw; 47. a nut block; 48. a guide bar; 49. a pedestal; 50. a decelerating member; 51. a driving gear; 52. a driven gear; 53. a connecting frame; 54. a feeding port; 55. and (4) a discharge port.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b): a lifting machine comprises a bottom plate 1, a machine body shell 2, a lifting motor 3, a driving shaft 4, a driven shaft 5, a chain wheel 6, a chain 7, a hopper 8, a ladder stand 9, a conveying plate 10 and a second lifting device 22 as shown in figures 1 and 2.
As shown in fig. 1 and 3, a material inlet 54 and a material outlet 55 are arranged on the machine body housing 2, the material inlet 54 and the material outlet 55 are respectively arranged on opposite side walls of the machine body housing 2, the material outlet 55 is higher than the material inlet 54 in the vertical direction, and the machine body housing 2 is arranged on the bottom plate 1.
As shown in fig. 2, the driving shaft 4 is rotatably connected to the upper portion of the inside of the machine body housing 2, the driven shaft 5 is rotatably connected to the lower portion of the inside of the machine body housing 2, chain wheels 6 are arranged at both ends of the driving shaft 4 and both ends of the driven shaft 5, a chain 7 is sleeved on the chain wheels 6 and tensioned by the chain wheels 6, a hopper 8 is arranged on the chain 7, a connecting piece 23 is welded on a chain link of the chain 7, and the connecting piece 23 is connected with the hopper 8 through screws.
As shown in fig. 1 and 2, the outside of body shell 2 is equipped with backup pad 24, lift motor 3 sets up in backup pad 24, be connected through drive assembly 25 between lift motor 3 and the driving shaft 4, drive assembly 25 includes drive wheel 26, follow driving wheel 27 and belt 28, the one end of driving shaft 4 runs through body shell 2 and connects from driving wheel 27, drive wheel 26 passes through transmission shaft 30 and sets up on lift motor 3, be equipped with drive frame 29 in the backup pad 24, transmission shaft 30 rotates with drive frame 29 and is connected, lift motor 3 is connected to the one end of transmission shaft 30, drive wheel 26 is connected to the other end, belt 28 cover is established on drive wheel 26 and follow driving wheel 27 and is tensioned by drive wheel 26 and follow driving wheel 27.
As shown in fig. 1 and 3, the ladder stand 9 includes a rotating shaft 31, a ladder frame 32, a step plate 33 and a first lifting device 34, the first lifting device 34 is disposed on the body housing 2, the rotating shaft 31 is connected to an output end of the first lifting device 34, the first lifting device 34 includes a bracket 35, a cylinder 36 and a lifting block 37, the bracket 35 is disposed on the body housing 2 and abuts against the bottom plate 1, as shown in fig. 1 and 4, a groove 38 is disposed on the bracket 35, the cylinder 36 is disposed in the groove 38, the lifting block 37 is disposed on a piston rod of the cylinder 36, both ends of the rotating shaft 31 are connected to the lifting block 37, a guide groove 39 is disposed on a side wall of the groove 38, a guide block 40 is disposed on the lifting block 37, the guide block 40 is slidably fitted with the guide groove 39 so as to guide a moving direction of the lifting block 37, the ladder frame 32 is rotatably connected to the rotating shaft 31, the step plate 33 is disposed on the ladder frame 32, and, the ladder frame 32 abuts against the base plate 1 in the lowered position.
As shown in fig. 5 and 6, the conveying plate 10 is slidably engaged with the machine body housing 2, the conveying plate 10 is provided with a sliding block 42, the machine body housing 2 is provided with a sliding groove 43, the sliding block 42 is located in the sliding groove 43 and slidably engaged with the sliding groove 43, and as shown in fig. 1, the edge of the conveying plate 10 is provided with a limit plate 44.
As shown in fig. 5 and 7, the second lifting device 22 is disposed on the body housing 2, an output end of the second lifting device 22 is connected to the conveying plate 10, the second lifting device 22 includes a lifting motor 45, a lead screw 46, a nut block 47 and a guide rod 48, the lead screw 46 is rotatably connected to the body housing 2 through a shaft bracket 49, the shaft bracket 49 is disposed on the body housing 2, the lead screw 46 is rotatably connected to the shaft bracket 49, the lifting motor 45 is disposed on the body housing 2 and is connected to the lead screw 46 through a speed reduction member 50, the speed reduction member 50 includes a driving gear 51 and a driven gear 52, the driving gear 51 is disposed on the lifting motor 45, the driven gear 52 is disposed on the lead screw 46, the driving gear 51 is smaller than the driven gear 52, the driving gear 51 is engaged with the driven gear 52, the nut block 47 is screwed on the lead screw 46, the guide rod 48 is disposed on the body housing 2 through the nut block 47 through, in order to guide the moving direction of the nut block 47, a link frame 53 is provided on the body housing 2, a guide bar 48 is provided on the link frame 53, and the feed plate 10 is detachably attached to the nut block 47 by screws.
The implementation process comprises the following steps: if lifting motor 3 breaks down, on placing transport plate 10 with the maintenance instrument, start lifting motor 45, lifting motor 45 drives driving gear 51 and rotates, and driving gear 51 drives driven gear 52 and rotates, and driven gear 52 drives lead screw 46 and rotates, and lead screw 46 drives nut block 47 orientation and deviates from the ground direction and removes in the rotation process, carries the maintenance instrument to the eminence.
Lift up ladder frame 32, ladder frame 32 revolutes shaft 31 and rotates, start cylinder 36, cylinder 36 drives elevator 37 and moves near the ground direction towards, pivot 31 moves along with elevator 37, adjust pivot 31 to suitable position after, put down ladder frame 32, ladder frame 32 is the tilt state, make footboard 33 be the horizontality, the maintainer directly walks to the eminence through footboard 33 and takes up the maintenance instrument and overhaul lifting motor 3, do not need maintainer transport ladder to engine body shell 2 department, save time.
If need dismantle lifting motor 3 and maintain, on the maintainer can place delivery board 10 after lifting motor 3 dismantles, restart elevator motor 45, elevator motor 45 drives delivery board 10 through nut piece 47 and moves towards being close to the ground direction, until will lifting motor 3 carries to the low point, will promote motor 3 and take off from delivery board 10 and overhaul.
When not using cat ladder 9, start cylinder 36, cylinder 36 drives pivot 31 through elevator 37 and moves towards deviating from the ground direction, and in pivot 31 removal process, the angle between ladder frame 32 and the bottom plate 1 changes, and the degree of inclination of ladder frame 32 changes, and when ladder frame 32 was vertical state, stop pivot 31 and remove to the purpose of realizing packing up cat ladder 9.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims (10)

1. The utility model provides a lifting machine, includes engine body shell (2) and sets up lifting motor (3) on engine body shell (2), its characterized in that: still include cat ladder (9), cat ladder (9) are including pivot (31), ladder frame (32), footboard (33) and be used for driving first elevating gear (34) that pivot (31) moved on vertical direction, first elevating gear (34) set up on body shell (2), pivot (31) are connected in the output of first elevating gear (34), ladder frame (32) rotate with pivot (31) and are connected, footboard (33) set up on ladder frame (32).
2. The hoist as claimed in claim 1, characterized in that: first elevating gear (34) include support (35), cylinder (36) and elevator (37), support (35) set up on body shell (2), be equipped with recess (38) on support (35), cylinder (36) set up in recess (38), elevator (37) set up on the piston rod of cylinder (36), the both ends of pivot (31) link to each other with elevator (37).
3. The hoisting machine as claimed in claim 2, characterized in that: be equipped with guide way (39) on recess (38) lateral wall, be equipped with guide block (40) on elevator block (37), guide block (40) and guide way (39) sliding fit.
4. The hoist as claimed in claim 1, characterized in that: the machine body shell (2) is further provided with a conveying plate (10) and a second lifting device (22) used for driving the conveying plate (10) to move in the vertical direction, the conveying plate (10) is in sliding fit with the machine body shell (2), the second lifting device (22) is arranged on the machine body shell (2), and the output end of the second lifting device (22) is connected with the conveying plate (10).
5. The hoist as claimed in claim 4, characterized in that: the second lifting device (22) comprises a lifting motor (45), a lead screw (46), a nut block (47) and a guide rod (48), the lead screw (46) is rotatably connected with the machine body shell (2), the lifting motor (45) is arranged on the machine body shell (2) and is linked with the lead screw (46), the nut block (47) is in threaded connection with the lead screw (46), the guide rod (48) is arranged on the machine body shell (2) and penetrates through the nut block (47), and the conveying plate (10) is arranged on the nut block (47).
6. The hoist as claimed in claim 5, characterized in that: the lead screw (46) is connected with the lifting motor (45) through a speed reducing component (50), the speed reducing component (50) comprises a driving gear (51) and a driven gear (52), the driving gear (51) is arranged on the lifting motor (45), the driven gear (52) is arranged on the lead screw (46), the driving gear (51) is smaller than the driven gear (52), and the driving gear (51) is meshed with the driven gear (52).
7. The hoist as claimed in claim 5, characterized in that: and a limiting plate (44) is arranged on the edge of the conveying plate (10).
8. The hoist as claimed in claim 5, characterized in that: the conveying plate (10) is detachably connected with the nut block (47).
9. The hoisting machine as claimed in claim 2, characterized in that: still include bottom plate (1), engine body shell (2) set up on bottom plate (1), support (35) conflict bottom plate (1), conflict bottom plate (1) when ladder frame (32) are in the state of putting down.
10. The hoist as claimed in claim 1, characterized in that: the pedal (33) is provided with an anti-skid bump (41).
CN201920754884.8U 2019-05-23 2019-05-23 Hoisting machine Expired - Fee Related CN210365527U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920754884.8U CN210365527U (en) 2019-05-23 2019-05-23 Hoisting machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920754884.8U CN210365527U (en) 2019-05-23 2019-05-23 Hoisting machine

Publications (1)

Publication Number Publication Date
CN210365527U true CN210365527U (en) 2020-04-21

Family

ID=70261515

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920754884.8U Expired - Fee Related CN210365527U (en) 2019-05-23 2019-05-23 Hoisting machine

Country Status (1)

Country Link
CN (1) CN210365527U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113086514A (en) * 2021-06-07 2021-07-09 荣智工企智能技术(昆山)有限公司 Material handling device
CN113666045A (en) * 2020-05-13 2021-11-19 高侨自动化科技股份有限公司 Article storage and storage system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113666045A (en) * 2020-05-13 2021-11-19 高侨自动化科技股份有限公司 Article storage and storage system
CN113086514A (en) * 2021-06-07 2021-07-09 荣智工企智能技术(昆山)有限公司 Material handling device

Similar Documents

Publication Publication Date Title
CN210365527U (en) Hoisting machine
CN108609396A (en) Auto-reversal Machine's
CN205662298U (en) Climbing mechanism of material loading machine
CN209161028U (en) A kind of cardboard feeding system
CN2900438Y (en) Top stacking side taking type round material stacking and taking machine
CN201914724U (en) Multifunctional rotating and telescoping grain scraper
CN108861704A (en) A kind of cardboard feeding system
CN109500899A (en) A kind of guillotine
CN209081326U (en) A kind of transmission positioned-lifting platform
CN211712534U (en) Mining is lifting support for equipment convenient to remove
CN210103357U (en) Hoisting accessory of wallboard installation
CN205187300U (en) Switching -over device and conveying system
CN208882714U (en) Screw elevator is used in a kind of easily operated adhesive transport
CN216544904U (en) Feeding device for carton processing
CN213293824U (en) Movable steering telescopic conveyor
CN212399222U (en) Lifting rotary conveying table of glass machine
CN209113106U (en) Large-scale ceramic tile goes up and down the machine that turns around
CN106144474B (en) A kind of conveyer
CN220906212U (en) T-shaped elevator
CN218840726U (en) Counter weight tensioning device of bucket-wheel stacker reclaimer
CN221274647U (en) Sand stone processing conveyer
CN110339893A (en) A kind of jaw crusher convenient for feeding intake
CN219991056U (en) Lifting device for producing wear-resistant material
CN215043841U (en) Finished product bulk device for sand making
CN213737662U (en) Port cargo conveyor convenient for direction adjustment

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: 20200421

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