Weeding machine and weeding method for seedlings in paddy field

Patent metadata

Field	Value
Publication number	US-12349612-B2
Application number	US-202217956856-A
Country	US
Kind code	B2
Filing date	Sep 30, 2022
Priority date	Jul 30, 2020
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A weeding machine and a weeding method for seedlings in a paddy field are disclosed. The weeding machine includes a paddy field power chassis, a lifting hydraulic cylinder, a parallelogram suspension frame, a weeding frame, a transmission assembly, and weeding units. The paddy field power chassis vertically adjusts the working depth of the weeding machine through the parallelogram suspension frame and the lifting hydraulic cylinder. The power is transmitted to the weeding units by the transmission assembly. The weeding units are used for pulling out weeds between rows and feeding the weeds to weed chopping channels. Spiral weed chopping knives are used for chopping the weeds and conveying the weeds to feeding channels. Bidirectional variable-pitch augers are used for conveying the chopped weeds to discharge openings of the feeding channels under pressure and discharging the chopped weeds for burying weeds between plants.

First claim

What is claimed is:

1. A weeding machine for seedlings in a paddy field, comprising a paddy field power chassis, a lifting hydraulic cylinder, a parallelogram suspension frame, a weeding frame, a transmission assembly, and weeding units,
wherein a first end of the lifting hydraulic cylinder is connected with the paddy field power chassis, a second end of the lifting hydraulic cylinder is connected with the parallelogram suspension frame, a first end of the parallelogram suspension frame is connected with the paddy field power chassis, a second end of the parallelogram suspension frame is connected with the weeding frame, and each of the transmission assembly and each of the weeding units is mounted on the weeding frame;
wherein the transmission assembly comprises a transmission spindle, a cover plate, a transmission shaft I, a transmission shaft II, a power input shaft, a transmission shaft III, a transmission shaft IV, and weeding unit spindles, wherein
a first end of the transmission spindle is connected with the paddy field power chassis, a second end of the transmission spindle is connected with the power input shaft, each of the transmission shaft II and the transmission shaft III is connected with the power input shaft through a first chain transmission, the transmission shaft I is connected with the transmission shaft II through a second chain transmission, the transmission shaft IV is connected with the transmission shaft III through a third chain transmission, each of the transmission shaft I, the transmission shaft II, the transmission shaft III and the transmission shaft IV is connected with each of the weeding unit spindles through a fourth chain transmission, and the cover plate is connected with the weeding frame;
wherein each of the weeding units comprises a floating plate frame, floating plates, the weeding unit spindle, a spiral weed chopping knife, a weed chopping channel, a weeding unit frame, a worm transmission case I, weed collecting screws, weed collecting inverted teeth, a weed collecting spiral shaft, a feeding channel, a discharge opening, a bidirectional variable-pitch auger, an auger shaft, a worm transmission case II, and a feeding shaft, wherein
the floating plate frame is connected with the weeding frame, each of the floating plates is connected with the floating plate frame, each of the weeding unit spindles is connected with each of the weed chopping channels, each of the weed chopping channels is connected with each of the weeding unit frames, each of the weeding unit frames is connected with the weeding frame, each of the spiral weed chopping knives is connected with each of the weeding unit spindles, a first end of the worm transmission case I is connected with each of the weeding unit spindles, a second end of the worm transmission case I is connected with each of the weed collecting spiral shafts, each of the weed collecting screws is connected with each of the weed collecting spiral shafts, each of the weed collecting inverted teeth is mounted on each of the weed collecting screws, each of the feeding channels is connected with each of the weed chopping channels, each of the discharge openings is connected with each of the feeding channels, each of the auger shafts is connected with each of the feeding channels, each of the bidirectional variable-pitch augers is connected with each of the auger shafts, a first end of the worm transmission case II is connected with each of the auger shafts, a second end of the worm transmission case II is connected with each of the feeding shafts, and each of the feeding shafts is connected with each of the weeding unit spindles through a fifth chain transmission.

2. The weeding machine according to claim 1 , wherein the weeding frame is provided with six to eight groups of weeding units, and the floating plate frame is provided with four to six floating plates.

3. The weeding machine according to claim 1 , wherein each of the weed collecting screws comprises two groups of spiral structures, wherein the two groups of spiral structures rotate in opposite directions, each of four to eight groups of weed collecting inverted teeth is mounted on each of the two groups of spiral structures, and an angle of each of the weed collecting inverted teeth is 50° to 70°.

4. The weeding machine according to claim 1 , wherein each of the spiral weed chopping knives comprises six to ten groups of teeth, and each of the six to ten groups of teeth is in a spiral structure.

5. The weeding machine according to claim 1 , wherein a distance between an inner surface of each of the weed chopping channels and a surface of each of the spiral weed chopping knives is 2 mm to 5 mm, and the inner surface of each of the weed chopping channels is made of a wear-resistant metal material.

6. The weeding machine according to claim 1 , wherein each of the bidirectional variable-pitch augers comprises two groups of spiral augers, wherein the two groups of spiral augers rotate in opposite directions, and a pitch of each of the bidirectional variable-pitch augers is variable and the pitch of each of the bidirectional variable-pitch augers is gradually reduced from a feed opening to each of the discharge openings.

7. An inter-row and inter-plant weeding method for seedlings in a paddy field by using the weeding machine according to claim 1 , wherein a working mode of pulling out weeds, chopping the weeds and burying the weeds is configured, a depth of a weeding operation of the weeding machine is adjusted through the lifting hydraulic cylinder, and a power of the paddy field power chassis is transmitted to each of the weeding units through the transmission assembly; when working, each of the weeding units operates between rows of the seedlings, the weeds between the rows are pulled out through a rotation action of each of the weed collecting screws, and the weeds between the rows are fed to each of the weed chopping channels, wherein an inter-row weeding of the seedlings in the paddy field is realized; and the weeds are chopped and conveyed to each of the feeding channels under a rotary cutting action of each of the spiral weed chopping knives to obtain chopped weeds, and the chopped weeds are conveyed to each of the discharge openings under a pressure by the bidirectional variable-pitch augers, wherein the discharge openings are respectively on two sides of the feeding channels, the chopped weeds are discharged from each of the discharge openings and the chopped weeds fall between plants of the seedlings, the weeds between the plants are buried, wherein photosynthesis of the weeds is inhibited to realize an inter-plant weeding, wherein the seedlings have a high compressive strength, the seedlings are retained after the weeds are buried by the chopped weeds, and inter-row and inter-plant weeding operations of the seedlings in the paddy field are completed.

8. The inter-row and inter-plant weeding method according to claim 7 , wherein in the weeding machine, the weeding frame is provided with six to eight groups of weeding units, and the floating plate frame is provided with four to six floating plates.

9. The inter-row and inter-plant weeding method according to claim 7 , wherein in the weeding machine, each of the weed collecting screws comprises two groups of spiral structures, wherein the two groups of spiral structures rotate in opposite directions, each of four to eight groups of weed collecting inverted teeth is mounted on each of the two groups of spiral structures, and an angle of each of the weed collecting inverted teeth is 50° to 70°.

10. The inter-row and inter-plant weeding method according to claim 7 , wherein in the weeding machine, each of the spiral weed chopping knives comprises six to ten

Assignees

• Univ Zhejiang

Inventors

• Du Dongdong
• Wang Jun
• Wei Zhenbo
• Li Dongfang

Classifications

• A01M21/02

  Apparatus for mechanical destruction {(hand-tools for uprooting weeds A01B1/16; machines for working soil and for weeding A01B39/18; harvesting machines A01D; cutting implements A01G3/00)} · CPC title

• A01D34/53

  Helically shaped cutting members · CPC title

• A01D45/04

  of rice · CPC title

• A01D41/145

  Header lifting devices · CPC title

• A01B39/18 Primary

  for weeding · CPC title