CN109178181A - A kind of park maintenance prevention and control of plant diseases, pest control Operation Van - Google Patents

A kind of park maintenance prevention and control of plant diseases, pest control Operation Van Download PDF

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Publication number
CN109178181A
CN109178181A CN201811080729.9A CN201811080729A CN109178181A CN 109178181 A CN109178181 A CN 109178181A CN 201811080729 A CN201811080729 A CN 201811080729A CN 109178181 A CN109178181 A CN 109178181A
Authority
CN
China
Prior art keywords
gear
crank
vehicle frame
door body
axle
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.)
Withdrawn
Application number
CN201811080729.9A
Other languages
Chinese (zh)
Inventor
万忠辉
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 CN201811080729.9A priority Critical patent/CN109178181A/en
Publication of CN109178181A publication Critical patent/CN109178181A/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00—Protecting plants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K17/00—Cycles not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M1/00—Rider propulsion of wheeled vehicles
    • B62M1/36—Rider propulsion of wheeled vehicles with rotary cranks, e.g. with pedal cranks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89—Metals

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Catching Or Destruction (AREA)

Abstract

The invention discloses a kind of park maintenance prevention and control of plant diseases, pest control Operation Vans, carriage body including vehicle frame and on vehicle frame, the vehicle frame is equipped with front axle and rear axle, rotation is equipped with front-wheel on the front axle, rotation is equipped with rear-wheel on the rear axle, it is characterized in that, the rear-wheel two sides are respectively equipped with one group of pedal-driven mechanism, the pedal-driven mechanism includes the first gear that rotation is set on rear axle, the first gear is fixed on rear-wheel side, second gear is rotatably connected to by first rotating shaft on the vehicle frame, the first gear engages second gear, the vehicle frame is also rotatably connected to the first crank, first crank includes the first crank axle portion and the first crank bar portion, the first crank axle portion is rotationally connected on vehicle frame.Pedal-driven mechanism structure of the invention is novel in design, eliminates traditional reel chain, and structure is simplified, and topology layout is reasonable, has practicability.

Description

A kind of park maintenance prevention and control of plant diseases, pest control Operation Van
Technical field
The present invention relates to field of garden technology, particularly relate to a kind of park maintenance prevention and control of plant diseases, pest control Operation Van.
Background technique
The driving method unreasonable structural design of existing machinery device, chain type transmission mechanism limitation are big, it is difficult to break through knot Structure limitation, long chain are easy to fall off damage.The car door opening mode of existing carriage body is not smart enough, and open-close ways are unreasonable, It needs to improve.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of park maintenance prevention and control of plant diseases, pest control Operation Vans, existing to solve There is the driving method unreasonable structural design of mechanical device in technology, chain type transmission mechanism limitation is big, it is difficult to break through structure limit System, long chain is easy to fall off damage and the car door opening mode of existing carriage body is not smart enough, and open-close ways are unreasonable, needs The technical issues of improving.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of park maintenance prevention and control of plant diseases, pest control Operation Van, Carriage body including vehicle frame and on vehicle frame, the vehicle frame are equipped with front axle and rear axle, and rotation is equipped with front-wheel, institute on the front axle It states rotation on rear axle and is equipped with rear-wheel, the rear-wheel two sides are respectively equipped with one group of pedal-driven mechanism, pedal-driven mechanism packet The first gear that rotation is set on rear axle is included, the first gear is fixed on rear-wheel side, passes through first rotating shaft on the vehicle frame It is rotatably connected to second gear, the first gear engages second gear, and the vehicle frame is also rotatably connected to the first crank, described First crank includes the first crank axle portion and the first crank bar portion, and the first crank axle portion is rotationally connected on vehicle frame, described It is fixedly connected with third gear in first crank axle portion, the second gear engages third gear, in the first crank axle portion It is also arranged with the 4th gear, the 4th gear is fixed on vehicle frame, and the first crank bar portion is connected by the rotation of the 5th shaft It is connected to the 5th gear, the 4th gear engages the 5th gear, and the first crank bar portion is also rotatablely connected the second crank, described Second crank includes the second crank axle portion and the second crank bar portion, and the second crank axle portion is rotationally connected with the first crank bar portion On, the 6th gear is fixed in the second crank axle portion, the 5th gear engages the 6th gear, second toggle-action lever The outer end in portion, which rotates, is equipped with foot pedal, and the number of teeth of the 4th gear and the 6th gear is identical, in Liang Zu pedal-driven mechanism The angle of rotation of first crank bar portion differs 180 °, and the second crank bar portion in Liang Zu pedal-driven mechanism is in the same direction and horizontally disposed；
Headlamp is additionally provided on the vehicle frame, the headlamp includes lamp holder, Lamp cup, radiator, aluminum substrate, radiation air It fans, reflector, LED lamp bead is installed on the aluminum substrate, the lamp holder is installed on vehicle frame, and the lamp holder is connected simultaneously with Lamp cup L-shaped, the Lamp cup is fixedly arranged at the front end with aluminum substrate, and the aluminum substrate is mutually fixed with radiator, and the aluminum substrate is simultaneously also and instead Tabula rasa is mutually fixed, and the radiator is arranged in Lamp cup, and the reflector is set in front of Lamp cup, the Lamp cup front be equipped with into Stomata, the Lamp cup rear portion are equipped with venthole, and the Lamp cup rear portion is additionally provided with radiator fan.
The carriage body is equipped with door opener, and the door opener includes door body and the guide rail set on door body side, described Guide rail is vertically arranged, and the guide rail upper end is rotatably equipped with the first partial gear, and first partial gear is fixedly connected There are the first door body mounting plate, the first partial gear engagement second partial gear of connection, second partial gear It is fixedly connected with first connecting rod, the first connecting rod is rotatablely connected second connecting rod, and one end of the second connecting rod is fixed with third Partial gear, the guide rail are equipped with vertically arranged guide runner, successively slide and be provided with from top to bottom in the guide runner First sliding block and the second sliding block, the third partial gear rotate on the first sliding block, and the third partial gear is also solid Surely the second door body mounting plate is connected, also rotation is equipped with the 4th partial gear, the incomplete tooth of third on first sliding block Wheel is engaged in the 4th partial gear, and the 4th partial gear is fixedly connected with third connecting rod, the outer end of the third connecting rod It is rotatablely connected fourth link, one end of the fourth link is rotationally connected on the second sliding block, and one end of the fourth link is also It is fixed with third door body mounting plate, is mounted on a door body on the first, second, third door body mounting plate, three The door body is horizontally disposed, and first, second, third, fourth connecting rod is located at the side of guide runner, and described first, second, the Three door body mounting plates are located at the other side of guide runner.
The advantageous effects of the above technical solutions of the present invention are as follows:
Door opener of the invention is reasonable in design, folding angle it is big, may also function as after unlatching keep off the rain, the function of sunshade Effect has practicability.Pedal-driven mechanism structure of the invention is novel in design, eliminates traditional reel chain, structure obtains essence Letter, topology layout is reasonable, has practicability.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention.
Fig. 2 is the planar structure schematic diagram of pedal-driven mechanism of the invention.
Fig. 3 is the schematic perspective view of pedal-driven mechanism of the invention.
Fig. 4 is the partial perspective view of pedal-driven mechanism of the invention.
Fig. 5 is the part isometric exploded view of pedal-driven mechanism of the invention.
Fig. 6 is the movement locus schematic diagram of pedal-driven mechanism of the invention.
Fig. 7 is the perspective view of door opener of the invention.
Fig. 8 is the part isometric structure chart one of door opener of the invention.
Fig. 9 is the part isometric structure chart two of door opener of the invention.
Figure 10 is the part isometric structure chart three of door opener of the invention.
Figure 11 is the state change map of door opener of the invention.
Figure 12 is the structural schematic diagram of headlamp of the invention.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool Body embodiment is described in detail.
For convenience of description and explanation, right direction in Fig. 1 be entire mechanism before, front end, front, direction of advance, Fig. 1 In left direction be the rear of entire mechanism, rear end, rear portion, direction of retreat.
As shown in Figures 1 to 6, the embodiment of the present invention provides a kind of park maintenance prevention and control of plant diseases, pest control Operation Van, including vehicle Frame 100 and the carriage body 110 on vehicle frame 100, the vehicle frame 100 are equipped with front axle 11 and rear axle 12, turn on the front axle 11 Dynamic to be equipped with front-wheel 13, rotation is equipped with rear-wheel 14 on the rear axle 12, and the bottom of the carriage body 110 can increase auxiliary according to actual needs Wheel is helped, 14 two sides of rear-wheel are respectively equipped with one group of pedal-driven mechanism 10, and the pedal-driven mechanism 10 includes that rotation is set to First gear 15 on rear axle 12, the first gear 15 are fixed on 14 side of rear-wheel, pass through first rotating shaft on the vehicle frame 100 16 are rotatably connected to second gear 17, and the first gear 15 engages second gear 17, and the vehicle frame 100 is also rotatably connected to the One crank, first crank include the first crank axle portion 18 and the first crank bar portion 19, and the first crank axle portion 18 rotates It is connected on vehicle frame 100, is fixedly connected with third gear 20 in the first crank axle portion 18, the engagement of second gear 17 the Three gears 20 are also arranged with the 4th gear 21 in the first crank axle portion 18, and the 4th gear 21 is fixed on vehicle frame 100 On, the first crank bar portion 19 is rotatably connected to the 5th gear 23 by the 5th shaft 22, the 4th gear 21 engagement the Five gears 23, the first crank bar portion 19 are also rotatablely connected the second crank, and second crank includes the second crank axle portion 24 With the second crank bar portion 25, the second crank axle portion 24 is rotationally connected in the first crank bar portion 19, second crank axle Be fixed with the 6th gear 26 in portion 24, the 5th gear 23 engages the 6th gear 26, the second crank bar portion 25 it is outer End rotation is equipped with foot pedal 27, and the 4th gear 21 is identical with the number of teeth of the 6th gear 26, in Liang Zu pedal-driven mechanism 10 The angle of rotation of the first crank bar portion differ 180 °, the second crank bar portion in Liang Zu pedal-driven mechanism 10 is in the same direction and level is set It sets.Since the number of teeth of the 4th gear and the 6th gear is identical, the second crank bar portion can keep original state always It is horizontally disposed.As shown in fig. 6, in the pedal-driven mechanism the first crank bar portion outer end motion profile such as circle a, pedal Running track such as circle b, therefore manpower pushes pedals can drive vehicle wheel rotation.
As shown in Fig. 1, Fig. 7 to Figure 11, the carriage body 110 is equipped with door opener 30, and the door opener 30 includes door Body 46 and guide rail 31 set on 46 side of door body, the guide rail 31 is vertically arranged, and 31 upper end of guide rail is rotatably equipped with first Partial gear 32, first partial gear 32 are fixedly connected with the first door body mounting plate 33, the first incomplete tooth 31 engagement the second partial gears 34 of connection of wheel, second partial gear 34 are fixedly connected with first connecting rod 35, and described first Connecting rod 35 is rotatablely connected second connecting rod 36, and one end of the second connecting rod 36 is fixed with third partial gear 37, described to lead Rail 31 is equipped with vertically arranged guide runner 38, successively slides from top to bottom in the guide runner 38 and is provided with 39 He of the first sliding block Second sliding block 40, the third partial gear 37 rotate on the first sliding block 39, and the third partial gear 37 is also fixed The second door body mounting plate 41 is connected, also rotation is equipped with the 4th partial gear 42 on first sliding block 39, and the third is endless All gear 37 is engaged in the 4th partial gear 42, and the 4th partial gear 42 is fixedly connected with third connecting rod 43, and described The outer end of three-link 43 is rotatablely connected fourth link 44, and one end of the fourth link 44 is rotationally connected on the second sliding block 40, One end of the fourth link 44 is also fixed with third door body mounting plate 45, on the first, second, third door body mounting plate It is mounted on a door body 46, three door body 46 are horizontally disposed, and first, second, third, fourth connecting rod, which is located at, leads The side of sliding slot 38, the first, second, third door body mounting plate are located at the other side of guide runner 38, described first, second, The gear teeth of third partial gear are all identical.When the second sliding block is located below position, three door body are located at vertical direction On, entire carriage body is in close state, when needing to open, by drive the second sliding block upward sliding, first, second, third Door body mounting plate synchronizes outside fold, drives the movement of three door body respectively, second, third door body mounting plate also simultaneously with sliding block to Upper movement, last three door body are brought to the top of carriage body, and turn down outward, the similar rain-proof shed structure of formation, and carriage body The open area that opens the door is big, and the structure of three door body designs and do not need to occupy big space when so that turning down, and facilitates operation.The compartment Prevention and control of plant diseases, pest control tool, such as device for administration of drugs can be equipped in body.
As shown in figs. 1 and 12, headlamp 70 is additionally provided on the vehicle frame, the headlamp 70 includes lamp holder 71, Lamp cup 72, radiator 73, aluminum substrate 74, radiator fan 75, reflector 76 are equipped with LED lamp bead 77, the lamp on the aluminum substrate 74 Seat 71 is installed on vehicle frame, and the lamp holder 71 is connected and L-shaped with Lamp cup 72, and the Lamp cup 72 is fixedly arranged at the front end with aluminum substrate 74, The aluminum substrate 74 is fixed with 73 phase of radiator, and the aluminum substrate 74 is also fixed with 76 phase of reflector simultaneously, the radiator 73 It is arranged in Lamp cup 72, the reflector 76 is set to 72 front of Lamp cup, and 72 front of Lamp cup is equipped with air inlet 78, the lamp 72 rear portions of cup are equipped with venthole 79, and 72 rear portion of Lamp cup is additionally provided with radiator fan 75.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (2)

1. a kind of park maintenance prevention and control of plant diseases, pest control Operation Van, the carriage body including vehicle frame and on vehicle frame are set on the vehicle frame There are front axle and rear axle, rotation is equipped with front-wheel on the front axle, and rotation is equipped with rear-wheel on the rear axle, which is characterized in that after described Wheel two sides are respectively equipped with one group of pedal-driven mechanism, and the pedal-driven mechanism includes the first gear that rotation is set on rear axle, The first gear is fixed on rear-wheel side, is rotatably connected to second gear by first rotating shaft on the vehicle frame, and described first Gear engages second gear, and the vehicle frame is also rotatably connected to the first crank, first crank include the first crank axle portion and First crank bar portion, the first crank axle portion are rotationally connected on vehicle frame, and is fixedly connected in the first crank axle portion Three gears, the second gear engage third gear, are also arranged with the 4th gear, the 4th tooth in the first crank axle portion Wheel is fixed on vehicle frame, and the first crank bar portion is rotatably connected to the 5th gear by the 5th shaft, and the 4th gear is nibbled Close the 5th gear, the first crank bar portion is also rotatablely connected the second crank, second crank include the second crank axle portion and Second crank bar portion, the second crank axle portion are rotationally connected in the first crank bar portion, fixed in the second crank axle portion Equipped with the 6th gear, the 5th gear engages the 6th gear, and the outer end rotation of the second crank bar portion is equipped with foot pedal, institute The number of teeth for stating the 4th gear and the 6th gear is identical, the angle of rotation difference of the first crank bar portion in Liang Zu pedal-driven mechanism 180 °, the second crank bar portion in Liang Zu pedal-driven mechanism is in the same direction and horizontally disposed；
It is additionally provided with headlamp on the vehicle frame, the headlamp includes lamp holder, Lamp cup, radiator, aluminum substrate, radiator fan, anti- Tabula rasa is equipped with LED lamp bead on the aluminum substrate, and the lamp holder is installed on vehicle frame, and the lamp holder is connected with Lamp cup and is in L Shape, the Lamp cup are fixedly arranged at the front end with aluminum substrate, and the aluminum substrate is mutually fixed with radiator, the aluminum substrate simultaneously also with reflector Mutually fixed, the radiator is arranged in Lamp cup, and the reflector is set in front of Lamp cup, and the Lamp cup front is equipped with air inlet Hole, the Lamp cup rear portion are equipped with venthole, and the Lamp cup rear portion is additionally provided with radiator fan.
2. carriage body according to claim 1, which is characterized in that the carriage body is equipped with door opener, the door opener Guide rail including door body and set on door body side, the guide rail is vertically arranged, and it is endless that the guide rail upper end is rotatably equipped with first All gear, first partial gear are fixedly connected with the first door body mounting plate, the first partial gear engagement connection Second partial gear, second partial gear are fixedly connected with first connecting rod, and the first connecting rod rotation connection second connects Bar, one end of the second connecting rod are fixed with third partial gear, and the guide rail is equipped with vertically arranged guide runner, institute State in guide runner from top to bottom that successively sliding is provided with the first sliding block and the second sliding block, the third partial gear rotates in the On one sliding block, the third partial gear is also fixedly connected with the second door body mounting plate, and also rotation is equipped on first sliding block 4th partial gear, the third partial gear are engaged in the 4th partial gear, and the 4th partial gear is fixed Third connecting rod is connected, the outer end of the third connecting rod is rotatablely connected fourth link, and one end of the fourth link is rotationally connected with On second sliding block, one end of the fourth link is also fixed with third door body mounting plate, first, second, third door body A door body is mounted on mounting plate, three door body are horizontally disposed, first, second, third, fourth connecting rod position In the side of guide runner, the first, second, third door body mounting plate is located at the other side of guide runner.
CN201811080729.9A 2018-09-17 2018-09-17 A kind of park maintenance prevention and control of plant diseases, pest control Operation Van Withdrawn CN109178181A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811080729.9A CN109178181A (en) 2018-09-17 2018-09-17 A kind of park maintenance prevention and control of plant diseases, pest control Operation Van

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811080729.9A CN109178181A (en) 2018-09-17 2018-09-17 A kind of park maintenance prevention and control of plant diseases, pest control Operation Van

Publications (1)

Publication Number Publication Date
CN109178181A true CN109178181A (en) 2019-01-11

Family

ID=64911550

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811080729.9A Withdrawn CN109178181A (en) 2018-09-17 2018-09-17 A kind of park maintenance prevention and control of plant diseases, pest control Operation Van

Country Status (1)

Country Link
CN (1) CN109178181A (en)

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Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication
WW01 Invention patent application withdrawn after publication

Application publication date: 20190111

DD01 Delivery of document by public notice
DD01 Delivery of document by public notice

Addressee: Wan Zhonghui

Document name: Notification of Approving Refund