CN111420914B - Agricultural flushing equipment with pressure convenient to adjust - Google Patents

Agricultural flushing equipment with pressure convenient to adjust Download PDF

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Publication number
CN111420914B
CN111420914B CN202010271945.2A CN202010271945A CN111420914B CN 111420914 B CN111420914 B CN 111420914B CN 202010271945 A CN202010271945 A CN 202010271945A CN 111420914 B CN111420914 B CN 111420914B
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China
Prior art keywords
mounting
groove
agricultural
plate
adjust
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Expired - Fee Related
Application number
CN202010271945.2A
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Chinese (zh)
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CN111420914A (en
Inventor
姜翔鹤
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Changshan Cuixiangmi Family Farm
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Changshan Cuixiangmi Family Farm
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Priority to CN202010271945.2A priority Critical patent/CN111420914B/en
Publication of CN111420914A publication Critical patent/CN111420914A/en
Application granted granted Critical
Publication of CN111420914B publication Critical patent/CN111420914B/en
Expired - Fee Related legal-status Critical Current
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02Cleaning by the force of jets or sprays
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00Protecting plants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B13/00Accessories or details of general applicability for machines or apparatus for cleaning

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Nozzles (AREA)
  • Catching Or Destruction (AREA)

Abstract

The invention belongs to the field of agricultural showering equipment, and particularly relates to agricultural showering equipment with conveniently-adjusted pressure, which aims at solving the problems that the existing showering mode needs manual work to shower trees, the manual showering efficiency is low, branches are dense or the trees are high, the showering difficulty is high, and if the showering equipment such as a water gun for washing a vehicle is directly used, the water pressure cannot meet the industrial requirements. The tree spraying device is reasonable in structure and convenient to operate, trees can be automatically sprayed by the spraying mode, the spraying efficiency is high, the spraying position and height can be adjusted, the spraying difficulty is low, and the water pressure can be adjusted and can meet different spraying requirements.

Description

Agricultural flushing equipment with pressure convenient to adjust
Technical Field
The invention relates to the technical field of agricultural showering equipment, in particular to agricultural showering equipment with conveniently-adjusted pressure.
Background
The plant cultivation industry is an agricultural production department for cultivating various crops and obtaining plant products, the planting industry is one of main components of agriculture, and the social production department obtains grains, non-staple food, feed and industrial raw materials by artificial cultivation by utilizing living functions of plants. Including the cultivation of various crops, woods, fruit trees, medicinal and ornamental plants, and the like, in the planting industry, trees need to be showered. Under the condition that the pesticide cannot be used in the fruit maturation period, red spiders can be removed by showering, a very large effect is achieved, meanwhile, lichen on the trunk and dust on the leaves can be cleaned, photosynthesis of plants is facilitated, the pesticide is replaced by water, and the pesticide is environment-friendly and ecological, and has a good effect of reducing weight and reducing pesticide in agriculture.
However, the existing showering mode needs manpower to shower trees, the manual showering efficiency is low, the showering difficulty is high when branches are dense or trees are high, and if showering equipment such as a water gun for washing a vehicle is directly used, the water pressure cannot meet the industrial requirements.
Disclosure of Invention
The invention aims to solve the defects that in the prior art, a spraying mode needs manual spraying on trees, the manual spraying efficiency is low, the spraying difficulty is high when branches are dense or the trees are high, and if spraying equipment such as a water gun for washing a vehicle is directly used, the water pressure cannot meet the industrial requirements, and the agricultural spraying equipment with the pressure convenient to adjust is provided.
In order to achieve the purpose, the invention adopts the following technical scheme:
an agricultural flushing device with convenient pressure adjustment comprises a placing plate, wherein two bases are fixedly arranged at the bottom of the placing plate, mounting grooves are formed in the bottoms of the two bases, mounting columns are movably arranged in the two mounting grooves, first mounting plates are fixedly arranged at the bottom ends of the two mounting columns, two universal wheels are arranged at the bottoms of the two first mounting plates, a high-pressure water pump is fixedly arranged at the top of the placing plate, two mounting frames are fixedly arranged at the top of the placing plate, the same winding wheel is rotatably arranged on the two mounting frames, a connecting pipe is wound on the winding wheel, one end of the connecting pipe is fixedly connected to a water outlet of the high-pressure water pump, a fixed column is fixedly arranged at the top of the placing plate, a fixed groove is formed in the top end of the fixed column, a movable column is slidably arranged in the fixed groove, a top plate is fixedly arranged at the, placed high-pressure squirt on the rack, the other end fixed connection of connecting pipe is on the water inlet of high-pressure squirt, the slide opening has been seted up at the top of roof, slidable mounting has the regulating plate in the slide opening, one side fixed mounting of regulating plate has the linking arm, the one end fixed mounting of linking arm has the mating panel, the last control trigger setting of high-pressure squirt is between regulating plate and mating panel, threaded hole has been seted up to one side of regulating plate, the control flume has been seted up on one side inner wall of slide opening, the lead screw is installed to the control flume internal rotation, lead screw threaded mounting panel is in the screw thread hole, fixed cover is equipped with first bevel gear on the lead screw, the bottom fixed mounting of roof has the second.
Preferably, a rack is fixedly mounted on one side of the moving column, a first motor is fixedly mounted on one side of the fixed column, a gear is fixedly connected to an output shaft of the first motor, the gear is meshed with the rack, the first motor drives the gear to rotate, the gear drives the rack to move, and the rack drives the moving column to move.
Preferably, the equal fixed mounting in one side of two bases has the mount, all clamps the change post on two mounts, and the equal fixed mounting in bottom of two change posts has the second mounting panel, and the equal fixed mounting in bottom of two second mounting panels has two fixed plates, and one side of four fixed plates is all rotated and is installed the walking gyro wheel, can be with changing in the post installation groove to use the walking gyro wheel to use on the road surface of difference.
Preferably, the spacing groove has been seted up to one side of erection column, has seted up the recess on one side inner wall of mounting groove, and slidable mounting has the stopper in the recess, and the through-hole has been seted up to stopper and spacing groove looks adaptation on one side inner wall of recess, and the screw rod drives the stopper and removes, and the stopper roll-off spacing groove can cancel the fixed restriction of erection column.
Preferably, a screw rod is slidably mounted in the through hole, one end of the screw rod is welded on the limiting block, a nut is fixedly sleeved on the screw rod, and the nut is rotatably mounted on one side of the base.
Preferably, the spout has all been seted up on the both sides inner wall of fixed slot, and the equal fixed mounting in both sides of removal post has the slider, and slider slidable mounting drives the slider and slides in the spout when removing the post removal in the spout that corresponds, position when can stably removing the post removal.
Preferably, all seted up the auxiliary groove on the both sides inner wall of slide opening, the equal fixed mounting in both sides of regulating plate has supplementary piece, and supplementary piece slidable mounting drives supplementary piece and slides in supplementary inslot that corresponds when the regulating plate removes, can stabilize the position when regulating plate rotates.
Preferably, a rotating groove is formed in one side of the mounting rack, a rotating block is fixedly mounted on one side of the rotating wheel, the rotating block is rotatably mounted in the rotating groove, the rotating block is driven to rotate in the rotating groove when the rotating wheel rotates, and the position of the rotating wheel can be stably rotated.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the scheme, the use position of the shower equipment can be moved under the driving of the universal wheels through the placing plate, the nut is rotated, the screw rod drives the limiting block to move, the fixed limit of the mounting column can be cancelled, the replacing column can be mounted in the mounting groove and used on different road surfaces by using the walking roller, the nut is rotated reversely, the position of the replacing column can be fixed, the second motor drives the second bevel gear to rotate, the first bevel gear drives the screw rod to rotate, and the adjusting plate drives the control trigger on the high-pressure water gun to move;
(2) according to the scheme, the control trigger can control the high-pressure water gun to be opened, the moving position of the control trigger can adjust the spraying force of the high-pressure water gun, after the second motor drives the second bevel gear to rotate reversely, the adjusting plate and the matching plate can control the control trigger to reset, the first motor drives the gear to rotate, the rack drives the moving column to move, and therefore the using height of the high-pressure water gun can be adjusted;
the tree spraying device is reasonable in structure and convenient to operate, trees can be automatically sprayed by the spraying mode, the spraying efficiency is high, the spraying position and height can be adjusted, the spraying difficulty is low, and the water pressure can be adjusted and can meet different spraying requirements.
Drawings
FIG. 1 is a schematic view of a front view structure according to the present invention;
FIG. 2 is a schematic view of part A of the structure proposed by the present invention;
FIG. 3 is a schematic structural diagram of part B according to the present invention;
FIG. 4 is a schematic structural diagram of part C according to the present invention;
fig. 5 is a schematic structural diagram of part D according to the present invention.
In the figure: 1. placing the plate; 2. a base; 3. mounting a column; 4. a first mounting plate; 5. a universal wheel; 6. a high pressure water pump; 7. a mounting frame; 8. winding wheels; 9. fixing a column; 10. moving the column; 11. a top plate; 12. placing a rack; 13. a high pressure water gun; 14. a rack; 15. a first motor; 16. a gear; 17. an adjusting plate; 18. a mating plate; 19. a screw rod; 20. a first bevel gear; 21. a second motor; 22. a second bevel gear; 23. a limiting groove; 24. a limiting block; 25. a screw; 26. a nut; 27. replacing the column; 28. a second mounting plate; 29. and (5) walking rollers.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of this patent does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.
Referring to fig. 1-5, an agricultural showering device with pressure convenient to adjust comprises a placing plate 1, two bases 2 are fixedly installed at the bottom of the placing plate 1, mounting grooves are respectively formed at the bottoms of the two bases 2, mounting columns 3 are movably installed in the two mounting grooves, first mounting plates 4 are respectively fixedly installed at the bottoms of the two mounting columns 3, two universal wheels 5 are respectively installed at the bottoms of the two first mounting plates 4, a high-pressure water pump 6 is fixedly installed at the top of the placing plate 1, two mounting frames 7 are fixedly installed at the top of the placing plate 1, the same winding wheel 8 is rotatably installed on the two mounting frames 7, a connecting pipe is wound on the winding wheel 8, one end of the connecting pipe is fixedly connected to a water outlet of the high-pressure water pump 6, a fixed column 9 is fixedly installed at the top of the placing plate 1, a fixing groove is formed at the top end of the, a top plate 11 is fixedly installed at the top end of the moving column 10, a placing frame 12 is fixedly installed at the top of the top plate 11, a high-pressure water gun 13 is placed on the placing frame 12, the other end of a connecting pipe is fixedly connected to a water inlet of the high-pressure water gun 13, a slide hole is formed in the top of the top plate 11, an adjusting plate 17 is slidably installed in the slide hole, a connecting arm is fixedly installed at one side of the adjusting plate 17, a matching plate 18 is fixedly installed at one end of the connecting arm, a control trigger on the high-pressure water gun 13 is arranged between the adjusting plate 17 and the matching plate 18, a threaded hole is formed in one side of the adjusting plate 17, a control groove is formed in the inner wall of one side of the slide hole, a lead screw 19 is rotatably installed in the control groove, a threaded mounting plate of the lead screw 19 is, the second bevel gear 22 meshes with the first bevel gear 20.
In this embodiment, one side fixed mounting of moving post 10 has rack 14, and one side fixed mounting of fixed column 9 has first motor 15, fixedly connected with gear 16 on the output shaft of first motor 15, and gear 16 and rack 14 mesh, first motor 15 drive gear 16 and rotate, and gear 16 drives rack 14 and removes, and rack 14 drives moving post 10 and removes.
In this embodiment, the equal fixed mounting in one side of two bases 2 has the mount, all clamps change post 27 on two mounts, and the equal fixed mounting in bottom of two change posts 27 has second mounting panel 28, and the equal fixed mounting in bottom of two second mounting panels 28 has two fixed plates, and one side of four fixed plates is all rotated and is installed walking gyro wheel 29, can install the mounting groove with changing post 27 in to use walking gyro wheel 29 and use on the road surface of difference.
In this embodiment, spacing groove 23 has been seted up to one side of erection column 3, has seted up the recess on one side inner wall of mounting groove, and slidable mounting has stopper 24 in the recess, and stopper 24 and spacing groove 23 looks adaptation have seted up the through-hole on one side inner wall of recess, and screw rod 25 drives stopper 24 and removes, and stopper 24 roll-off spacing groove 23 can cancel the fixed restriction of erection column 3.
In this embodiment, slidable mounting has screw rod 25 in the through-hole, and the one end welding of screw rod 25 is on stopper 24, and the fixed cover is equipped with nut 26 on screw rod 25, and nut 26 rotates and installs the one side at base 2.
In this embodiment, all seted up the spout on the both sides inner wall of fixed slot, the equal fixed mounting in both sides of removal post 10 has the slider, and slider slidable mounting drives the slider and slides in the spout when removing post 10 and remove in the spout that corresponds, can stabilize the position when removing post 10 and remove.
In this embodiment, all seted up the auxiliary groove on the both sides inner wall of slide opening, the equal fixed mounting in both sides of regulating plate 17 has supplementary piece, and supplementary piece slidable mounting is at the supplementary inslot that corresponds, drives supplementary piece and slides in supplementary inslot when regulating plate 17 removes, can stabilize the position when regulating plate 17 rotates.
In this embodiment, the rotation groove has been seted up to one side of mounting bracket 7, has the turning block around establishing one side fixed mounting of wheel 8, and the turning block rotates to be installed at the rotation inslot, drives the turning block at the rotation inslot rotation when establishing wheel 8 and rotate, can stabilize around establishing the position when wheel 8 rotates.
In this embodiment, the worker checks each component to ensure that the component can be used after no error, the electrical components appearing in the component are electrically connected with an external main controller and 220V commercial power, and the main controller can be a conventional known device controlled by a computer, the use position of the shower device can be moved under the drive of the universal wheel 5 by the placing plate 1, the nut 26 is rotated to drive the screw 25 to move, the screw 25 drives the limit block 24 to move, the limit block 24 slides out of the limit groove 23, so that the fixed limit of the mounting post 3 can be cancelled, the replacing post 27 can be mounted in the mounting groove and used on different road surfaces by using the walking roller 29, the nut 26 is rotated reversely, the limit block 24 is inserted into the corresponding limit groove 23 to fix the position of the replacing post 27, the second motor 21 drives the second bevel gear 22 to rotate, the second bevel gear 22 drives the first bevel gear 20 to rotate, the first bevel gear 20 drives the screw rod 19 to rotate, the screw rod 19 drives the adjusting plate 17 and the matching plate 18 to move simultaneously, the adjusting plate 17 drives the control trigger on the high-pressure water gun 13 to move, the control trigger can control the high-pressure water gun 13 to be opened, the high-pressure water pump 6 conveys water into the high-pressure water gun 13 through the connecting pipe, the moving position of the control trigger can adjust the spraying force of the high-pressure water gun 13, the high-pressure water gun 13 flushes trees in lessons, the adjusting plate 17 and the matching plate 18 can control the control trigger to reset and close the high-pressure water gun 13 after the second motor 21 drives the second bevel gear 22 to rotate reversely, the first motor 15 drives the gear 16 to rotate, the gear 16 drives the rack 14 to move, the rack 14 drives the moving column 10 to move, the moving column 10 drives the high-pressure water gun 13 to move, and the using height of the high-pressure water, the shower efficiency is high, the shower position and height can be adjusted, the shower difficulty is low, and the water pressure can be adjusted and adapted to different shower requirements.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

Claims (8)

1. The agricultural flushing equipment with the pressure convenient to adjust comprises a placing plate (1) and is characterized in that two bases (2) are fixedly installed at the bottom of the placing plate (1), mounting grooves are formed in the bottoms of the two bases (2), mounting columns (3) are movably installed in the two mounting grooves, first mounting plates (4) are fixedly installed at the bottoms of the two mounting columns (3), two universal wheels (5) are installed at the bottoms of the two first mounting plates (4), a high-pressure water pump (6) is fixedly installed at the top of the placing plate (1), two mounting frames (7) are fixedly installed at the top of the placing plate (1), the same winding wheel (8) is rotatably installed on the two mounting frames (7), a connecting pipe is wound on the winding wheel (8), one end of the connecting pipe is fixedly connected to a water outlet of the high-pressure water pump (6), and a fixing column (9) is fixedly installed at the top of the placing plate (1), the top end of the fixed column (9) is provided with a fixed groove, the fixed groove is internally provided with a movable column (10) in a sliding manner, the top end of the movable column (10) is fixedly provided with a top plate (11), the top part of the top plate (11) is fixedly provided with a placing frame (12), the placing frame (12) is provided with a high-pressure water gun (13), the other end of the connecting pipe is fixedly connected with a water inlet of the high-pressure water gun (13), the top part of the top plate (11) is provided with a slide hole, the slide hole is internally provided with an adjusting plate (17) in a sliding manner, one side of the adjusting plate (17) is fixedly provided with a connecting arm, one end of the connecting arm is fixedly provided with a matching plate (18), a control trigger on the high-pressure water gun (13) is arranged between the adjusting plate (17, screw rod (19) threaded mounting is in the threaded hole, and the fixed cover is equipped with first bevel gear (20) on screw rod (19), and the bottom fixed mounting of roof (11) has second motor (21), fixedly connected with second bevel gear (22) on the output shaft of second motor (21), and second bevel gear (22) and first bevel gear (20) meshing.
2. The agricultural showering device with the pressure convenient to adjust as claimed in claim 1, wherein a rack (14) is fixedly installed on one side of the moving column (10), a first motor (15) is fixedly installed on one side of the fixed column (9), a gear (16) is fixedly connected to an output shaft of the first motor (15), and the gear (16) is meshed with the rack (14).
3. The agricultural showering device with the pressure convenient to adjust as claimed in claim 1, wherein one side of each of the two bases (2) is fixedly provided with a fixing frame, the two fixing frames are respectively provided with a replacing column (27) in a clamping manner, the bottom ends of the two replacing columns (27) are respectively fixedly provided with a second mounting plate (28), the bottom ends of the two second mounting plates (28) are respectively fixedly provided with two fixing plates, and one side of each of the four fixing plates is rotatably provided with a walking roller (29).
4. The agricultural sprinkling equipment with the pressure convenient to adjust according to claim 1, wherein a limiting groove (23) is formed in one side of the mounting column (3), a groove is formed in the inner wall of one side of the mounting groove, a limiting block (24) is slidably mounted in the groove, the limiting block (24) is matched with the limiting groove (23), and a through hole is formed in the inner wall of one side of the groove.
5. The agricultural showering device with the pressure convenient to adjust as claimed in claim 4, wherein a screw rod (25) is slidably mounted in the through hole, one end of the screw rod (25) is welded on the limiting block (24), a nut (26) is fixedly sleeved on the screw rod (25), and the nut (26) is rotatably mounted on one side of the base (2).
6. The agricultural showering device with the pressure convenient to adjust as claimed in claim 1, wherein sliding grooves are formed in the inner walls of the two sides of the fixing groove, sliding blocks are fixedly mounted on the two sides of the moving column (10), and the sliding blocks are slidably mounted in the corresponding sliding grooves.
7. The agricultural showering device with the pressure convenient to adjust as claimed in claim 1, wherein the inner walls of two sides of the sliding hole are provided with auxiliary grooves, two sides of the adjusting plate (17) are fixedly provided with auxiliary blocks, and the auxiliary blocks are slidably arranged in the corresponding auxiliary grooves.
8. The agricultural showering device with the pressure convenient to adjust as claimed in claim 1, wherein a rotating groove is formed in one side of the mounting frame (7), a rotating block is fixedly installed on one side of the winding wheel (8), and the rotating block is rotatably installed in the rotating groove.
CN202010271945.2A 2020-04-09 2020-04-09 Agricultural flushing equipment with pressure convenient to adjust Expired - Fee Related CN111420914B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010271945.2A CN111420914B (en) 2020-04-09 2020-04-09 Agricultural flushing equipment with pressure convenient to adjust

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010271945.2A CN111420914B (en) 2020-04-09 2020-04-09 Agricultural flushing equipment with pressure convenient to adjust

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CN111420914A CN111420914A (en) 2020-07-17
CN111420914B true CN111420914B (en) 2021-05-11

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1147301A (en) * 1997-08-01 1999-02-23 Ishikawajima Shibaura Mach Co Ltd Water discharging gun
DE202004019949U1 (en) * 2004-12-07 2005-03-03 Suttner Gmbh & Co. Kg Shoulder rest for spray lance has quick-fit coupling for fixing device and a telescopic length adjuster as well as rotatable shoulder support with shock-absorbing element
JP2013120025A (en) * 2011-12-08 2013-06-17 Nisshin Kiko Kk Repairing method of heat transfer tube
CN203023800U (en) * 2012-11-23 2013-06-26 罗方畅 Water system accurate pressure adjusting device
CN103404410A (en) * 2013-08-09 2013-11-27 潍坊市景盛泰和园林工程有限公司 Dewatering and watering integrated machine
CN103404417A (en) * 2013-08-09 2013-11-27 潍坊市景盛泰和园林工程有限公司 Automatic watering machine
CN206923459U (en) * 2017-07-07 2018-01-26 杨其明 The special excrement automatic cleaning machine of one boar, ox, sheep domestic animal colony house
CN108782180A (en) * 2018-06-13 2018-11-13 张雪燕 A kind of sprinkling irrigation equipment easy to remove

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1147301A (en) * 1997-08-01 1999-02-23 Ishikawajima Shibaura Mach Co Ltd Water discharging gun
DE202004019949U1 (en) * 2004-12-07 2005-03-03 Suttner Gmbh & Co. Kg Shoulder rest for spray lance has quick-fit coupling for fixing device and a telescopic length adjuster as well as rotatable shoulder support with shock-absorbing element
JP2013120025A (en) * 2011-12-08 2013-06-17 Nisshin Kiko Kk Repairing method of heat transfer tube
CN203023800U (en) * 2012-11-23 2013-06-26 罗方畅 Water system accurate pressure adjusting device
CN103404410A (en) * 2013-08-09 2013-11-27 潍坊市景盛泰和园林工程有限公司 Dewatering and watering integrated machine
CN103404417A (en) * 2013-08-09 2013-11-27 潍坊市景盛泰和园林工程有限公司 Automatic watering machine
CN206923459U (en) * 2017-07-07 2018-01-26 杨其明 The special excrement automatic cleaning machine of one boar, ox, sheep domestic animal colony house
CN108782180A (en) * 2018-06-13 2018-11-13 张雪燕 A kind of sprinkling irrigation equipment easy to remove

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Granted publication date: 20210511