CN111300647A - Cement mixer for building - Google Patents

Cement mixer for building Download PDF

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Publication number
CN111300647A
CN111300647A CN202010143630.XA CN202010143630A CN111300647A CN 111300647 A CN111300647 A CN 111300647A CN 202010143630 A CN202010143630 A CN 202010143630A CN 111300647 A CN111300647 A CN 111300647A
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China
Prior art keywords
shaft
arc
rod
cement mixer
shaped groove
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Granted
Application number
CN202010143630.XA
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Chinese (zh)
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CN111300647B (en
Inventor
程玉勇
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.)
Lanling Derong Machinery Co Ltd
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Individual
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Priority to CN202010143630.XA priority Critical patent/CN111300647B/en
Publication of CN111300647A publication Critical patent/CN111300647A/en
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Publication of CN111300647B publication Critical patent/CN111300647B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/16—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a vertical or steeply inclined axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/087—Cleaning containers, e.g. tanks by methods involving the use of tools, e.g. brushes, scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/0806—Details; Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/0806—Details; Accessories
    • B28C5/0831—Drives or drive systems, e.g. toothed racks, winches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/0806—Details; Accessories
    • B28C5/0856—Supporting frames or structures, e.g. supporting wheels

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

The invention discloses a cement mixer for construction, which structurally comprises a circular groove, a support frame, a speed reducer, a power machine, a transmission belt, a rotating shaft, a discharge opening, a material guide plate, a valve and an opening and closing rod, wherein the support frame is welded at the bottom of the circular groove; has the advantages that: according to the invention, the side scraper is arranged at one end of the cross rod close to the inner wall of the circular groove, the upper end and the lower end of the side scraper are respectively provided with a group of arc-shaped grooves, the arc-shaped grooves are attached to the inner wall, and the arc-shaped grooves rotate forwards or backwards along with the stirring shaft, so that slurry attached to the inner wall of the circular groove can be scraped to the middle of the circular groove and uniformly stirred, and the phenomenon of non-uniformity of part of the slurry is prevented.

Description

Cement mixer for building
Technical Field
The invention relates to a cement mixer for construction, belonging to the technical field of construction equipment.
Background
In building engineering, often need mix the manufacturing to the material of building usefulness to this satisfies the demand of construction, these building materials include some cement, silt, rubble etc. when carrying out the mud stirring to cement, often use the cement mixer to stir it, in the course of working, have following not enough:
when cement thick liquids carry out rapid mixing at the circular slot, because thick liquids get rid of easily on the inner wall of circular slot under the effect of stirring leaf, the thick liquids that are located the circular slot middle can obtain abundant stirring, and the thick liquids that are close to the outside are attached to on the inner wall easily, can not obtain the stirring, make the thick liquids mixing of inner wall round uneven easily.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cement mixer for buildings to solve the problems.
In order to achieve the purpose, the invention is realized by the following technical scheme: a cement mixer for building structurally comprises a circular groove, a support frame, a speed reducer, a power machine, a transmission belt, a rotating shaft, a discharge opening, a material guide plate, a valve and an opening and closing rod, wherein the support frame is welded at the bottom of the circular groove, the speed reducer is installed in the middle of the support frame, the power machine is fixed on a right side rod of the support frame through a bolt, a belt wheel on the power machine is in transmission connection with an input shaft of the speed reducer through the transmission belt, the discharge opening is formed in the bottom of the left side of the circular groove, the valve is movably installed on the discharge opening, the opening and closing rod is connected to the valve, and the material guide plate is;
preferably, a material homogenizing mechanism is installed inside the circular groove and consists of a stirring shaft, stirring rods and side scraping devices, the stirring shaft is connected with a rotating shaft on the speed reducer through a coupler, and the stirring shaft is provided with two groups of symmetrical stirring rods and side scraping devices.
Preferably, the stirring rod is an L-shaped inverted arc rod.
Preferably, the side scraping device comprises a cross rod, a side scraper, a fixed column, a butterfly nut, a bolt, a connecting rod and a shaft sleeve, wherein one end of the cross rod is connected with the side scraper, the other end of the cross rod is vertically welded with the shaft sleeve, the shaft sleeve is fixed on the stirring shaft, the left side of the side scraper is welded with the fixed column through the connecting rod, and the upper end face and the lower end face of the fixed column are both connected with one bolt.
Preferably, the transverse rods are arranged on one side of the stirring shaft in an up-and-down symmetrical mode, one end, away from the stirring shaft, of the transverse rod on the upper portion is provided with a U-shaped groove, one end, away from the stirring shaft, of the transverse rod on the lower portion is provided with a threaded hole, the bolt at the bottom of the fixing column is in threaded connection with the transverse rod on the lower portion, and the bolt at the top is clamped in the U-shaped groove and fixed through a.
Preferably, the side scraper comprises an inner cavity, a shaking plate, a guide wheel column, an arc-shaped groove and a hinge shaft, the inner cavity is formed in the side scraper, the arc-shaped groove is formed in each of the front end and the rear end of the side scraper, the shaking plate is movably mounted on the edge of the arc-shaped groove, and the shaking plate is mounted on the arc-shaped groove through the hinge shaft.
Preferably, a set of vibrators are mounted at the upper end and the lower end of the inner cavity, and the vibrators are movably connected with the vibrating plate.
Preferably, the vibrator comprises a guide post wheel, an edge attaching device, balls and a vibrating spring, the guide post wheel is mounted at the upper end and the lower end of the inner cavity, the edge attaching device is arranged on one side, close to the vibrating plate, of the guide post wheel, the three balls are arranged on the inner arc edge of the edge attaching device, and the vibrating spring is connected between the edge attaching device and the vibrating plate.
Preferably, a coil spring is mounted on the hinge shaft, the coil spring is used for resetting the shaking plate, and the elastic force of the coil spring is smaller than that of the shaking spring.
Advantageous effects
The invention relates to a cement mixer for buildings, which has the following effects:
according to the invention, the side scraper is arranged at one end of the cross rod close to the inner wall of the circular groove, the upper end and the lower end of the side scraper are respectively provided with a group of arc-shaped grooves, the arc-shaped grooves are attached to the inner wall, the arc-shaped grooves rotate forwards or backwards along with the stirring shaft, slurry attached to the inner wall of the circular groove can be scraped to the middle of the circular groove and uniformly stirred, and the phenomenon of non-uniformity of part of the slurry is prevented;
the invention is movably provided with a shaking plate on the arc-shaped groove, the shaking plate is matched with a vibrator, a guide post wheel on the vibrator rolls on the inner wall, so that the edge pasting device transmits the vibration to a shaking spring, the shaking spring drives the shaking plate to be continuously pushed open and closed towards the outer side of the arc-shaped groove, the cement slurry on the arc-shaped groove is shaken off, and the cement slurry remained on the arc-shaped groove is prevented;
the tail end of the cross rod is provided with the U-shaped groove, and the fixing columns on the side scrapers are buckled with the U-shaped groove of the cross rod, so that the side scrapers are convenient to disassemble, assemble and clean.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural view of a cement mixer for construction according to the present invention;
FIG. 2 is a schematic sectional view of the front side of a circular groove according to the present invention;
FIG. 3 is a schematic top view of a circular groove according to the present invention;
FIG. 4 is a schematic top view of a side scraper according to the present invention;
FIG. 5 is a schematic cross-sectional view of a side scraper in a top view;
fig. 6 is an enlarged schematic view of a in fig. 5.
In the figure: the device comprises a circular groove-1, a support frame-2, a speed reducer-3, a power machine-4, a transmission belt-5, a rotating shaft-6, a discharge opening-7, a material guide plate-8, a valve-9, a starting and closing rod-10, a material refining mechanism-11, a stirring shaft-12, a stirring rod-13, a side scraping device-14, a cross rod-a, a side scraping device-b, a fixed column-c, a butterfly nut-d, a bolt-e, a connecting rod-f, a shaft sleeve-g, an inner cavity-b 1, a shaking plate-b 2, a guide wheel column-b 3, an arc groove-b 4, a hinge shaft-b 5, a vibrator-h, a guide wheel-h 1, a welting device-h 2, a ball-h 3 and a vibrating spring-h 4.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 1 to 6, the present invention provides a technical solution of a cement mixer for construction:
as shown in fig. 1 and 2, the structure of the circular trough includes a circular trough 1, a support frame 2, a speed reducer 3, a power machine 4, a transmission belt 5, a rotating shaft 6, a discharge opening 7, a material guide plate 8, a valve 9 and an opening and closing rod 10, the support frame 2 is welded at the bottom of the circular trough 1, the speed reducer 3 is installed in the middle of the support frame 2, the power machine 4 is fixed on a right side rod of the support frame 2 through bolts, a belt wheel on the power machine 4 is in transmission connection with an input shaft of the speed reducer 3 through the transmission belt 5, the discharge opening 7 is formed in the bottom of the left side of the circular trough 1, the valve 9 is movably installed on the discharge opening 7, the opening and closing rod 10 is connected to the valve 9, and.
Wherein, 1 internally mounted of circular slot has refining mechanism 11, refining mechanism 11 scrapes device 14 by (mixing) shaft 12, puddler 13, side and constitutes, rotation axis 6 on (mixing) shaft 12 and the reduction gear 3 is connected through the shaft coupling, the puddler 13 that is equipped with two sets of symmetries on the (mixing) shaft 12 scrapes device 14 with the side, puddler 13 is the arc pole of falling the L type, can stir the cement thick liquids in the circular slot 1, scrapes device 14 and strikes off the thick liquids that are close to circular slot 1 inboard, makes it drop and stirs evenly in the middle of circular slot 1.
As shown in fig. 2-4, the side scraping device 14 is composed of a cross bar a, a side scraper b, a fixing column c, a butterfly nut d, a bolt e, a connecting rod f and a shaft sleeve g, wherein one end of the cross bar a is connected with the side scraper b, the other end of the cross bar a is vertically welded with the shaft sleeve g, the shaft sleeve g is fixed on the stirring shaft 12, the left side of the side scraper b is welded with the fixing column c through the connecting rod f, and the upper end face and the lower end face of the fixing column c are both connected with one bolt e.
The side of the cross rod a on the stirring shaft 12 is arranged in a vertically symmetrical mode, one end, away from the stirring shaft 12, of the cross rod a on the upper portion is provided with a U-shaped groove, one end, away from the stirring shaft 12, of the cross rod a on the lower portion is provided with a threaded hole, a bolt e at the bottom of the fixing column c is in threaded connection with the cross rod a on the lower portion, the bolt e at the top is clamped in the U-shaped groove and fixed through a butterfly nut d, and the fixing column c on the side scraper b and the U-shaped groove of the cross rod a are buckled.
The side scraper b comprises an inner cavity b1, a shaking plate b2, a guide wheel column b3, an arc-shaped groove b4 and a hinge shaft b5, wherein an inner cavity b1 is formed in the side scraper b, the arc-shaped grooves b4 are formed in the front end and the rear end of the side scraper b, the shaking plate b2 is movably mounted on the edge of the arc-shaped groove b4, the shaking plate b2 is hinged to the arc-shaped groove b4 through the hinge shaft b5, the guide wheel column b3 is attached to the inner wall of the circular groove 1, the stirring shaft 12 drives the side scraper b to rotate, the arc-shaped groove b4 scrapes off slurry on the inner wall, and the slurry on the inner wall is prevented from being attached.
The upper end and the lower end of the inner cavity b1 are both provided with a group of vibrators h, and the vibrators h are movably connected with a vibrating plate b 2.
As shown in fig. 6, the vibrator h comprises a guide post wheel h1, an edge attaching device h2, balls h3 and a vibrating spring h4, the guide post wheel h1 is installed at the upper end and the lower end of an inner cavity b1, an edge attaching device h2 is arranged on one side of a guide post wheel h1 close to a vibrating plate b2, three balls h3 are arranged on the inner arc edge of an edge attaching device h2, a vibrating spring h4 is connected between the edge attaching device h2 and the vibrating plate b2, the guide post wheel h1 on the vibrator h rolls on the inner wall, the edge attaching device h2 vibrates while rolling, the vibrating spring h2 transmits the vibration to the vibrating spring h4, the vibrating spring h4 drives the vibrating plate b2 to be continuously pushed open and closed towards the outer side of an arc groove b4, cement paste on the arc groove b4 is vibrated, and the arc groove b4 is prevented from being left with cement paste.
The power machine 4 transmits power to the speed reducer 3 through the transmission belt 5, the speed reducer 3 enables the rotating shaft 6 to drive the stirring shaft 12 to rotate, and the side scraping device 14 on the stirring shaft 12 rotates along with the stirring rod 13; at the moment, cement, sand and water are added into the circular groove 1 according to a certain proportion and are uniformly mixed and stirred to form cement slurry, in the process that the cement slurry is mixed and stirred by the stirring rod 13, part of the slurry can be thrown onto the inner wall of the circular groove 1, the slurry on the inner wall cannot be stirred, and the phenomenon of non-uniformity is easy to occur, so that a side scraper b is arranged at one end, close to the inner wall, of the cross rod a, the stirring shaft 12 drives the side scraper b to rotate, the slurry on the inner wall is scraped off by the arc-shaped groove b4, and the slurry on the inner wall is prevented from adhering; guide post wheel h1 on the electromagnetic shaker h on inner chamber b1 rolls on the inner wall, makes hem facing ware h2 take place vibrations when rolling, and hem facing ware h2 will shake and transmit vibrations to shake spring h4, shakes spring h4 and will drive shake board b2 and constantly open the top to the arc groove b4 outside and close, shakes the cement thick liquids on arc groove b4 and falls, prevents to remain on the arc groove b4 and has the cement thick liquids to exist.
The foregoing merely illustrates the principles and preferred embodiments of the invention and many variations and modifications may be made by those skilled in the art in light of the foregoing disclosure, which are intended to be within the scope of the invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (7)

1. The utility model provides a cement mixer for building which characterized in that: the structure of the automatic opening and closing device comprises a circular groove (1), a support frame (2), a speed reducer (3), a power machine (4), a transmission belt (5), a rotating shaft (6), a discharge opening (7), a material guide plate (8), a valve (9) and an opening and closing rod (10), wherein the support frame (2) is welded at the bottom of the circular groove (1), the speed reducer (3) is installed in the middle of the support frame (2), the power machine (4) is fixed on a right side rod of the support frame (2) through bolts, a belt wheel on the power machine (4) is in transmission connection with an input shaft of the speed reducer (3) through the transmission belt (5), the discharge opening (7) is formed in the bottom of the left side of the circular groove (1), the valve (9) is movably installed on the discharge opening (7), the opening and closing rod (10) is connected to the valve (9), and the material;
circular slot (1) internally mounted has refining mechanism (11), refining mechanism (11) are scraped device (14) by (mixing) shaft (12), puddler (13), side and are constituteed, rotation axis (6) on (mixing) shaft (12) and reduction gear (3) are connected through the shaft coupling, puddler (13) that are equipped with two sets of symmetries on (mixing) shaft (12) scrape device (14) with the side.
2. A cement mixer for construction as claimed in claim 1, wherein: the stirring rod (13) is an inverted L-shaped arc rod.
3. A cement mixer for construction as claimed in claim 1, wherein: the side scraping device (14) is composed of a cross rod (a), a side scraper (b), a fixing column (c), a butterfly nut (d), a bolt (e), a connecting rod (f) and a shaft sleeve (g), one end of the cross rod (a) is connected with the side scraper (b), the other end of the cross rod is vertically welded with the shaft sleeve (g), the shaft sleeve (g) is fixed on the stirring shaft (12), the left side of the side scraper (b) is welded with the fixing column (c) through the connecting rod (f), and the upper end face and the lower end face of the fixing column (c) are connected with one bolt (e).
4. A cement mixer for construction as claimed in claim 3, wherein: the stirring shaft (12) is arranged on the upper portion of the cross rod (a), the end, away from the stirring shaft (12), of the cross rod (a) on the upper portion is provided with a U-shaped groove, a threaded hole is formed in the end, away from the stirring shaft (12), of the cross rod (a) on the lower portion, a bolt (e) at the bottom of the fixing column (c) is in threaded connection with the cross rod (a) on the lower portion, and the bolt (e) on the top is clamped in the U-shaped groove and fixed through a butterfly nut (d).
5. A cement mixer for construction as claimed in claim 3, wherein: the side scraper (b) comprises an inner cavity (b1), a shaking plate (b2), a guide wheel column (b3), an arc-shaped groove (b4) and a hinge shaft (b5), wherein an inner cavity (b1) is formed in the side scraper (b), the front end and the rear end of the side scraper (b) are provided with the arc-shaped groove (b4), the shaking plate (b2) is movably mounted on the edge of the arc-shaped groove (b4), and the shaking plate (b2) is hinged to the arc-shaped groove (b4) through the hinge shaft (b 5).
6. A cement mixer for building as claimed in claim 5, wherein: and the upper end and the lower end of the inner cavity (b1) are respectively provided with a group of vibrators (h), and the vibrators (h) are movably connected with a vibrating plate (b 2).
7. A cement mixer for building as claimed in claim 6, wherein: electromagnetic shaker (h) comprises guide pillar wheel (h1), welt ware (h2), ball (h3), vibrations spring (h4), guide pillar wheel (h1) is installed at the upper and lower both ends of inner chamber (b1), be equipped with welt ware (h2) on one side that guide pillar wheel (h1) are close to and shake board (b2), be equipped with three ball (h3) on the inner arc edge of welt ware (h2), be connected with between welt ware (h2) and the board of shaking (b2) and shake spring (h 4).
CN202010143630.XA 2020-03-04 2020-03-04 Cement mixer for building Active CN111300647B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010143630.XA CN111300647B (en) 2020-03-04 2020-03-04 Cement mixer for building

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Application Number Priority Date Filing Date Title
CN202010143630.XA CN111300647B (en) 2020-03-04 2020-03-04 Cement mixer for building

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CN111300647A true CN111300647A (en) 2020-06-19
CN111300647B CN111300647B (en) 2021-06-15

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207696784U (en) * 2018-01-09 2018-08-07 深圳市宝金华混凝土有限公司 A kind of blender
CN108748673A (en) * 2018-05-28 2018-11-06 芜湖超源力工业设计有限公司 A kind of industrial blender
CN208359090U (en) * 2018-05-25 2019-01-11 博昌园（宜兴）有限公司 The mixing arrangement of inert material and liquid material
CN110181691A (en) * 2019-07-09 2019-08-30 谢祥洲 A kind of Mechatronic mixer
CN209649124U (en) * 2019-01-19 2019-11-19 江苏盛达飞建筑材料有限公司 A kind of concrete vertical blender
CN110744710A (en) * 2019-10-29 2020-02-04 深圳市文地科技有限公司 A mortar preparation equipment that is used for high stirring degree of road construction
CN110815566A (en) * 2019-11-14 2020-02-21 江苏盈孚环境科技有限公司 Cement mixer for building

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207696784U (en) * 2018-01-09 2018-08-07 深圳市宝金华混凝土有限公司 A kind of blender
CN208359090U (en) * 2018-05-25 2019-01-11 博昌园（宜兴）有限公司 The mixing arrangement of inert material and liquid material
CN108748673A (en) * 2018-05-28 2018-11-06 芜湖超源力工业设计有限公司 A kind of industrial blender
CN209649124U (en) * 2019-01-19 2019-11-19 江苏盛达飞建筑材料有限公司 A kind of concrete vertical blender
CN110181691A (en) * 2019-07-09 2019-08-30 谢祥洲 A kind of Mechatronic mixer
CN110744710A (en) * 2019-10-29 2020-02-04 深圳市文地科技有限公司 A mortar preparation equipment that is used for high stirring degree of road construction
CN110815566A (en) * 2019-11-14 2020-02-21 江苏盈孚环境科技有限公司 Cement mixer for building

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Address after: 511400 No.5, beiliyuan 1st Street, Shiqiao street, Panyu District, Guangzhou City, Guangdong Province

Applicant after: Cheng Yuyong

Address before: 100010 Institute of technology development, bureau of machinery industry, 28 Yunan street, Dongsi block, Dongcheng District, Beijing

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Effective date of registration: 20211129

Address after: 276000 west section of Jinsheng Road, Lanling Economic Development Zone, Linyi City, Shandong Province

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Address before: 511400 No.5, beiliyuan 1st Street, Shiqiao street, Panyu District, Guangzhou City, Guangdong Province

Patentee before: Cheng Yuyong