WO2020177043A1 - 一种集成混砂机及混砂方法 - Google Patents

一种集成混砂机及混砂方法 Download PDF

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Publication number
WO2020177043A1
WO2020177043A1 PCT/CN2019/076776 CN2019076776W WO2020177043A1 WO 2020177043 A1 WO2020177043 A1 WO 2020177043A1 CN 2019076776 W CN2019076776 W CN 2019076776W WO 2020177043 A1 WO2020177043 A1 WO 2020177043A1
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Prior art keywords
mixing
sand
cylinder
drum
final
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PCT/CN2019/076776
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English (en)
French (fr)
Inventor
徐磊磊
陆高春
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Suzhou Mingzhi Technology Co Ltd
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Suzhou Mingzhi Technology Co Ltd
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Priority to DE212019000471.7U priority Critical patent/DE212019000471U1/de
Priority to PCT/CN2019/076776 priority patent/WO2020177043A1/zh
Priority to CN201980003391.3A priority patent/CN111432955B/zh
Publication of WO2020177043A1 publication Critical patent/WO2020177043A1/zh
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/044—Devices having a vertical stirrer shaft in a fixed receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/60—Mixing solids with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0726—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis having stirring elements connected to the stirrer shaft each by a single radial rod, other than open frameworks
    • B01F27/07261—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis having stirring elements connected to the stirrer shaft each by a single radial rod, other than open frameworks of the anchor type, i.e. the stirring elements being connected to the rods by one end and extending parallel to the shaft axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/82—Combinations of dissimilar mixers
    • B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0404—Stirring by using vibrations while grinding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/044—Devices having a vertical stirrer shaft in a fixed receptacle
    • B22C5/0445—Devices having a vertical stirrer shaft in a fixed receptacle the material flowing continuously through the device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/0472—Parts; Accessories; Controlling; Feeding; Discharging; Proportioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/0481—Blending, mixing, kneading or stirring; Methods therefor using vibrations

Definitions

  • the invention relates to a machine used in the metal casting industry, in particular to an integrated sand mixer and a sand mixing method, in particular to a sand mixer and a sand mixing method suitable for inorganic processes and cold core processes.
  • sand cores In the metal casting industry, the preparation of sand cores is an important part of the casting process. In this process, it is necessary to uniformly mix sand with binder, curing agent or other auxiliary agents to prepare molding sand (or core sand). In the prior art, mixing is usually achieved by mixing.
  • a conventional sand mixer is usually composed of a sand quantitative unit, a powdery auxiliary material quantitative unit, a liquid material quantitative unit, and a sand mixing unit.
  • the sand quantitative unit realizes raw sand quantification through volumetric quantitative or electronic quantitative methods
  • the powdery auxiliary quantitative unit realizes Electronic quantification of powder additives
  • the liquid material quantification unit mainly realizes the quantification of the liquid resin
  • the sand mixing unit realizes the final mixing of the raw sand, auxiliary materials, liquid materials and other materials in the above quantitative ratio to obtain the uniformity required for core making Excellent mixture.
  • Chinese utility model patent CN208050869U discloses a sand mixing machine, which includes a sand mixing drum, a feed inlet arranged on the top of the sand mixing drum, a support frame for supporting the sand mixing drum, and a rotating connection at the bottom of the sand mixing drum.
  • the stirring shaft that extends into the inner cavity of the sand mixing drum and the motor provided at the bottom of the sand mixing drum to provide power to the mixing shaft, it also includes a mixing blade fixedly connected to the mixing shaft, and a mixing blade arranged on the working surface of the mixing blade.
  • a mixing plate a discharge door arranged on the side of the sand mixing drum and a driving mechanism for controlling the opening and closing of the discharge door, the mixing plate is detachably connected to the mixing blade, and the mixing shaft is coaxial with the mixing drum Set up.
  • raw sand needs to be mixed with one or more powders and one or more liquid materials, and the raw sand must be initially mixed with the powder to achieve a certain uniformity, and then mixed with the liquid materials. Therefore, the existing process requires the use of a sand mixer for dry mixing for about 60 seconds, and then adding inorganic resin for wet mixing for about 60 seconds. In addition to other transitional processes, the action time takes about 144 seconds.
  • the action time using the above method also requires about 93s.
  • the mixing blades of the sand mixer are arranged horizontally. In order to achieve an excellent mixing effect, a longer mixing time (such as 60s) is required. This leads to a higher temperature rise and cannot be applied to inorganic processes or cold
  • the core technology on the other hand, also makes it difficult to shorten the entire process tact time.
  • the purpose of the present invention is to provide a sand mixing method, which can shorten the tact time of the sand mixing process by improving the process, realize efficient coordination with the core making machine, and avoid excessive heating of the molding sand, making it suitable for cold core processes and inorganic processes .
  • Another objective of the present invention is to provide an integrated sand mixer for realizing the sand mixing method.
  • the technical solution adopted by the present invention is: a sand mixing method, which is realized by a blade stirring sand mixer, the sand mixer has a sand quantitative device and a mixing drum, and the sand mixing method includes:
  • a pre-mixing blade is provided in the sand dosing device, and a pre-mixing power mechanism that drives the pre-mixing blade is provided, so that the sand dosing device constitutes a pre-mixing cylinder;
  • a powder feed port and a liquid feed port are respectively provided on the mixing cylinder, and the outlet of the premix cylinder is connected to the powder feed port of the mixing cylinder through a valve, so that the mixing cylinder Constitute the final mixing cylinder;
  • the final mixing cylinder when the final mixing cylinder is performing the mixing operation, the next cycle of raw sand quantitative addition, powder auxiliary material quantitative addition, and raw sand and powder auxiliary material premixing operations are simultaneously performed in the premix cylinder.
  • the lower part of the final mixing drum is arranged in a conical structure with a large upper and a small lower part, and the stirring blades in the final mixing drum are arranged as inclined blades arranged in parallel with the wall of the cone.
  • the rotation speed of the stirring blade is 150 to 250 revolutions per minute.
  • a vibration device is provided at the lower outlet of the premix cylinder, and the vibration device is turned on after feeding to the final mixing cylinder to clean the residual sand in the premix cylinder.
  • the time for the stirring blade in the final mixing drum to rotate and stir is not more than 45s.
  • an integrated sand mixer which includes a frame, a final mixing drum arranged on the frame, a mixing blade arranged in the final mixing drum, and a final mixing power mechanism for driving the mixing blade ,
  • the top of the final mixing barrel is provided with a feed inlet, the bottom is provided with a discharge port, and a pre-mixing barrel is provided.
  • the pre-mixing barrel is provided with pre-mixing blades, which are driven by a pre-mixing power mechanism.
  • the outlet at the bottom end of the cylinder is connected to the top feed port of the mixing cylinder via a sand scouring tube, and a valve is provided on the scouring tube;
  • the lower part of the final mixing cylinder is a cone-shaped structure with a large upper part and a small lower part. Inclined blades arranged on the cylindrical wall.
  • the pre-mixing cylinder is a conical bucket, and a load cell is provided on the frame in cooperation with the conical bucket.
  • a vibration device is provided at the lower outlet of the premix cylinder.
  • fixed auxiliary blades are arranged in the final mixing drum; a sand knife gate valve is arranged at the bottom outlet of the mixing drum.
  • the fixed auxiliary blades are arranged in the final mixing barrel, which can play a turbulence effect, intensify the tumbling effect of the core sand in the barrel, and ensure that a more uniform mixture is obtained in a shorter time.
  • Auxiliary blades can be arranged on the upper part of the final mixing drum.
  • the final mixing cylinder is provided with a quick-dismountable structure, which can realize the quick disassembly and offline cleaning and maintenance of the cylinder body.
  • the present invention has the following advantages compared with the prior art:
  • a pre-mixing blade is set in the sand quantitative device and changed to a pre-mixing cylinder.
  • a two-stage sand mixing is realized, and the first stage is a pre-mixing unit, which can realize raw sand Quantitative and dry mixing process of raw sand and powder additives, the second stage is the final mixing unit, which can realize the wet mixing process of the first-level pre-mixing unit mixture and the liquid material.
  • the two units can work at the same time, and they can be automatically controlled and matched through the program. The sanding time is greatly shortened.
  • the pre-mixing unit is equipped with pre-mixing blades, which can initially mix the raw sand and powder to obtain a more uniform initial mixture.
  • the pre-mixing unit is equipped with a sand mixing motor with a frequency conversion function, which can adjust the mixing time, temperature rise and uniformity of the sand at will The relationship between sex.
  • the final mixing unit is equipped with a high-speed sand mixing motor. At the same time, the final mixing drum adopts a cone-shaped barrel and inclined blade structure, which can obtain high-quality and excellent uniformity core sand mixture in a short time.
  • the final mixing unit is equipped with a frequency conversion. Function, the relationship between mixing time, mixing temperature rise and uniformity can be adjusted arbitrarily.
  • the cone-shaped cylinder structure and the sand outlet set at the bottom can realize the self-weight fall of the sand in the cylinder, and there are fewer sand residues in the cylinder. Only the wall of the cylinder needs to be cleaned when cleaning, and the sand will automatically flow out of the sand outlet, and the cleaning time is longer. Shorter and less difficult.
  • the final mixing cylinder of the sand mixer can be quickly disassembled, and the cylinder body lifting mechanism can be configured to manually replace the final mixing cylinder to achieve offline cleaning and maintenance.
  • Figure 1 is a schematic structural diagram of an embodiment of the present invention
  • Figure 2 is a left side view of Figure 1;
  • Fig. 3 is a cross-sectional view taken along line A-A in Fig. 2.
  • an integrated sand mixer includes a frame 1, a final mixing barrel 2 arranged on the frame 2, a premixing barrel 3 arranged above the side of the final mixing barrel 2 , The outlet at the bottom end of the pre-mixing cylinder 3 is connected to the top feed port of the final mixing cylinder 2 via a sand scouring tube 4, and a knife gate valve 5 is provided on the sand scouring tube 4.
  • the premixing cylinder 3 is a conical hopper, and the upper part is connected with a sand hopper 12 and a powder metering device 13.
  • a premixing blade 7 is arranged in the conical hopper, and the premixing blade 7 is driven by the premixing power mechanism 8.
  • 8 can be composed of a motor and a corresponding deceleration mechanism, and a load cell 10 is provided on the frame in cooperation with the premix cylinder 7.
  • the lower part of the final mixing cylinder 2 is a conical structure with a large upper and a small lower part.
  • the mixing blade 6 is provided with a mixing blade 6 which has inclined blades arranged parallel to the wall of the conical cylinder. The mixing blade 6 is driven by the final mixing power mechanism 9.
  • the mixing mechanism 9 can be composed of a motor and a corresponding reduction mechanism.
  • the mixing blade can be detachably driven by a quick connection device to facilitate the quick disassembly of the final mixing drum and offline cleaning.
  • the bottom outlet of the mixing drum 2 is provided with sand Knife gate valve 11.
  • the pre-mixing cylinder and the final mixing cylinder are respectively provided with a pre-mixing cylinder maintenance door 15 and a final mixing cylinder maintenance door 14, which can be used for internal blade replacement and daily cleaning and maintenance.
  • a vibration device may be provided at the lower outlet of the premix cylinder.
  • the final mixing barrel is also equipped with fixed auxiliary blades 16 to play a turbulence effect, intensify the tumbling effect of the core sand in the barrel, and ensure that a more uniform mixture is obtained in a shorter time.
  • the synchronous operation of premixing and final mixing can be realized, and the final mixing time can be greatly shortened compared with the prior art, thereby realizing the coordination with the high-efficiency core making machine.
  • the mixing drum is used for sand mixing (about 25s);
  • the pre-mixing cylinder carries out the next round of quantitative addition of raw sand, quantitative addition of powdered auxiliary materials, and premixing;
  • the entire cycle time is 40s, which can achieve a work efficiency of 90 batches per hour, which is much faster than the 93s cycle time in the prior art.
  • the pre-mixing cylinder carries out the next round of quantitative addition of raw sand, quantitative addition of powdered auxiliary materials, and premixing;
  • the entire cycle time is 60s, which can achieve a work efficiency of 60 batches per hour, which is much faster than the cycle time of 144s in the prior art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

一种集成混砂机，采用叶片搅拌式混砂机实现，混砂机具有砂定量装置及搅拌筒，在砂定量装置中设置预混叶片（7），并设置驱动预混叶片（7）的预混动力机构（8），使砂定量装置构成预混筒（3）；在搅拌筒上分别设置粉料进料口和液料进料口，预混筒（3）的出口经阀连接至搅拌筒的粉料进料口，使搅拌筒构成终混筒（2）；在预混筒（3）中进行原砂定量添加、粉状辅料定量添加及原砂与粉状辅料预混作业；与粉状辅料预混后的原砂和液体树脂料定量进入终混筒（2）中，驱动搅拌叶（6）旋转，混合均匀后获得所需型砂；其中，在终混筒（2）进行搅拌作业时，预混筒（3）中同步进行下一个循环的原砂定量添加、粉状辅料定量添加及原砂与粉状辅料预混作业。还公开一种集成混砂方法。本混砂机及混砂方法在不增加容器的前提下，实现了两级混砂，两个单元可同时工作，混砂时间大大缩短，可以任意调整混合时间、混砂温升及均匀性之间的关系。

Description

一种集成混砂机及混砂方法 技术领域
本发明涉及一种金属铸造行业使用的机械，具体涉及一种集成混砂机及混砂方法，尤其是适用于无机工艺和冷芯工艺使用的混砂机及混砂方法。
背景技术
在金属铸造行业中，砂芯的制备是铸造工艺的重要组成部分。在此过程中，需要将砂与粘结剂、固化剂或其它助剂均匀地混合起来，以制备型砂(或称芯砂)，现有技术中，通常采用搅拌方式实现混砂。
常规的混砂机通常由砂定量单元、粉状辅料定量单元、液料定量单元及混砂单元组成，砂定量单元通过体积定量方式或电子定量方式实现原砂定量，粉状辅料定量单元实现对粉末状添加剂的电子定量，液料定量单元主要实现对液体树脂进行定量，混砂单元实现对上述定量配比的原砂、辅料、液料等物料进行最终混合，以获取制芯所需的均匀性优异的混合物。例如，中国实用新型专利CN208050869U公开了一种混砂机，包括混砂筒、设置在混砂筒顶部的进料口、用于对混砂筒进行支撑的支撑架、转动连接在混砂筒底部且伸入到混砂筒内腔中的搅拌轴以及设置在混砂筒底部用于对搅拌轴提供动力的电机，还包括固定连接在搅拌轴上的搅拌叶、设置在搅拌叶工作面上的搅料板、设置在混砂筒侧边的卸料门以及用于控制卸料门打开和关闭的驱动机构，搅料板可拆卸连接在所述搅拌叶上，搅拌轴与混砂筒同轴设置。
上述技术能够实现混砂，并且通过设置可拆卸的搅料板，方便对粘附在工作面上的砂子的清理。但是，随着无机工艺和冷芯工艺的推广，这类混砂机的使用受到了限制，主要体现在以下方面：
(1)工艺过程节拍时间过长。
例如，无机工艺中，原砂需要与一种或多种粉末及一种或多种液料进行混合，而且原砂必须先与粉末进行初混达到一定的均匀性，再与液料进行混合。因此，现有工艺需要使用混砂机先进行干混约60s，再加入无机树脂，进行湿混约60 s，加上其它过渡工序，动作时间需要约144s。
冷芯工艺中，采用上述方法的动作时间也需要约93s。
然而，为了与高效的制芯机配合，要求上述动作时间控制在60s之内，显然，现有技术的工艺节拍无法满足该要求。
(2)混砂机的搅拌叶叶片为水平布置，为达到优异的混合效果，需要的较长的混合时间(例如60s)，这一方面导致较高的温升，不能适用于无机工艺或冷芯工艺，另一方面也导致整个工艺节拍时间难以缩短。
(3)由于采用水平叶片结构，叶片底部与搅拌桶之间存在较大间隙，这部分的砂不能有效混合，从而降低了芯砂混合物的混合质量，同时也使得清理比较困难。
(4)混砂机混砂筒无法方便、快速的拆卸，日常维护筒壁内衬及清理必须在线更换或清理，需要停机，影响正常生产。
因此，有必要对现有的混砂机及混砂方法进行改进，以克服上述缺陷。
发明概述
技术问题
问题的解决方案
技术解决方案
本发明的发明目的是提供一种混砂方法，通过工艺改进，缩短混砂工艺的节拍时间，实现与制芯机的高效配合，同时避免型砂过度升温，使其适用于冷芯工艺和无机工艺。本发明的另一发明目的是提供一种实现该混砂方法的集成混砂机。
为达到上述发明目的，本发明采用的技术方案是：一种混砂方法，采用叶片搅拌式混砂机实现，所述混砂机具有砂定量装置及搅拌筒，混砂方法包括：
(1)在砂定量装置中设置预混叶片，并设置驱动预混叶片的预混动力机构，使所述砂定量装置构成预混筒；
(2)在所述搅拌筒上分别设置粉料进料口和液料进料口，所述预混筒的出口经阀连接至所述搅拌筒的粉料进料口，使所述搅拌筒构成终混筒；
(3)在所述预混筒中进行原砂定量添加、粉状辅料定量添加及原砂与粉状辅料 预混作业；
(4)与粉状辅料预混后的原砂和液体树脂料定量进入终混筒中，驱动搅拌叶旋转，混合均匀后获得所需型砂；
其中，在终混筒进行搅拌作业时，预混筒中同步进行下一个循环的原砂定量添加、粉状辅料定量添加及原砂与粉状辅料预混作业。
上述技术方案中，通过在砂定量装置中设置预混叶片，将其改为预混筒，在不增加容器的前提下，实现了两级混砂。
进一步的技术方案，将所述终混筒的下部设置成上大下小的锥形结构，将终混筒内的搅拌叶设置成与锥形筒壁平行布置的倾斜式叶片。
通过将终混筒的下部设置成锥形结构，配合倾斜式叶片结构，可以短时间内获取高质量、均匀性优异的芯砂混合物，避免芯砂过度升温。
优选的技术方案，搅拌叶转速为150～250转/分钟。
进一步的技术方案，在所述预混筒下部出口处设置震动装置，在向终混筒送料后开启震动装置以清理预混筒的残留砂。
上述技术方案中，每个工艺节拍时间中，终混筒中搅拌叶旋转搅拌的时间不大于45s。
为实现本发明的另一发明目的，提供一种集成混砂机，包括机架、设置在机架上的终混筒、设置在终混筒内的搅拌叶、驱动搅拌叶的终混动力机构，终混筒顶部设有进料口，底部设有出料口，设有预混筒，所述预混筒内设有预混叶片，所述预混叶片由预混动力机构驱动，预混筒底端的出口经溜砂管连接至搅拌筒的顶部进料口，溜砂管上设有阀；所述终混筒下部为上大下小的锥形结构，所述搅拌叶具有平行于锥形筒壁布置的倾斜叶片。
上述技术方案中，所述预混筒为锥形斗，与所述锥形斗配合在机架上设有称重传感器。
进一步的技术方案，所述预混筒的下部出口处设置震动装置。
上述技术方案中，所述终混筒内设有固定的辅助叶片；所述搅拌筒底部出口处设有出砂刀闸阀。终混筒内配置固定式的辅助叶片，可以起到扰流作用，加剧筒内芯砂的翻腾效果，保证在更短的时间内获取更为均匀的混合物。辅助叶片 可以设置在终混筒的上部。
上述技术方案中，终混筒设置有可快速拆卸式结构，可实现筒体的快拆及线下清理维护。预混筒和终混筒上分别开设有维修门，可用于内部的叶片更换及日常清理维护。
发明的有益效果
有益效果
由于上述技术方案运用，本发明与现有技术相比具有下列优点：
1、本发明通过在砂定量装置中设置预混叶片，将其改为预混筒，在不增加容器的前提下，实现了两级混砂，一级为预混单元，可实现原砂的定量以及原砂和粉末添加剂的干混过程，二级为终混单元，可实现一级预混单元混合物与液料的湿混过程，两个单元可同时工作，通过程序自动控制及匹配，混砂时间大大缩短。
2、预混单元配置预混叶片，可将原砂与粉末进行初混，可以获取较为均匀的初始混合物，预混单元混砂电机配置变频功能，可以任意调整混合时间、混砂温升及均匀性之间的关系。
3、终混单元配置高速混砂电机，同时终混筒采用锥形筒体及倾斜式叶片结构，可以短时间内获取高质量、均匀性优异的芯砂混合物，终混单元混砂电机配置变频功能，可以任意调整混合时间、混砂温升及均匀性之间的关系。
4、锥形筒体结构以及设置在底部的出砂口可以实现筒内砂自重下落，筒内砂残留更少，清理时只需清理筒壁，砂会自动从出砂口流出，清理时间更短，难度也更小。
5、混砂机终混筒可快速拆卸，同时配置筒体升降机构，可人工更换终混筒，实现线下清理及维护。
对附图的简要说明
附图说明
图1是本发明实施例的结构示意图；
图2是图1的左视图；
图3是图2的A-A剖视图。
其中：1、机架；2、终混筒；3、预混筒；4、溜砂管；5、刀闸阀；6、搅拌叶；7、预混叶片；8、预混动力机构；9、终混动力机构；10、称重传感器；11、出砂刀闸阀；12、砂斗；13、粉末定量装置；14、终混筒维修门；15、预混筒维修门；16、辅助叶片。
发明实施例
本发明的实施方式
下面结合附图及实施例对本发明作进一步描述：
实施例一：参见图1至图3所示，一种集成混砂机，包括机架1、设置在机架上的终混筒2、设置在终混筒2的侧上方的预混筒3，预混筒3底端的出口经溜砂管4连接至终混筒2的顶部进料口，溜砂管4上设有刀闸阀5。
预混筒3为锥形斗，上部连接有砂斗12和粉末定量装置13，锥形斗内设有预混叶片7，所述预混叶片7由预混动力机构8驱动，预混动力机构8可以由电机及相应的减速机构构成，与预混筒7配合在机架上设有称重传感器10。终混筒2下部为上大下小的锥形结构，筒内设有搅拌叶6，搅拌叶6具有平行于锥形筒壁布置的倾斜叶片，搅拌叶6由终混动力机构9驱动，终混动力机构9可以由电机及相应的减速机构构成，可以通过快速连接装置可拆式地驱动搅拌叶，以便于终混筒的快速拆卸及线下清理，搅拌筒2底部出口处设有出砂刀闸阀11。
预混筒和终混筒上分别开设有预混筒维修门15和终混筒维修门14，可用于内部的叶片更换及日常清理维护。
本实施例中，可以在预混筒的下部出口处设置震动装置。
终混筒内还配置有固定式的辅助叶片16，以起到扰流作用，加剧筒内芯砂的翻腾效果，保证在更短的时间内获取更为均匀的混合物。
采用本实施例的混砂机，可以实现预混和终混的同步运行，并且，终混时间可比现有技术大大缩短，从而实现与高效制芯机的配合。
例如，对于冷芯工艺，一种可能的混砂程序是：
(1)在预混筒向搅拌筒加入原砂及粉状辅料混合物的同时，加入两种液体树脂料(约8s)；
(2)搅拌筒进行混砂搅拌(约25s)；
同时，预混筒进行下一轮的原砂定量添加、粉状辅料定量添加、预混；
(3)出砂刀闸阀打开放砂(5s)
(4)出砂刀闸阀关闭(2s)。
由此，整个节拍时间为40s，可达到每小时90批的工作效率，大大快于现有技术中93s的节拍时间。
对于无机工艺，一种可能的混砂程序是：
(1)在预混筒向搅拌筒加入原砂及粉状辅料混合物的同时，加入液体树脂料(约12s)，其中，最后3秒时开启震动装置，以清理预混斗残留砂；
(2)搅拌筒进行混砂搅拌(约40s)；
同时，预混筒进行下一轮的原砂定量添加、粉状辅料定量添加、预混；
(3)出砂刀闸阀打开放砂(6s)
(4)出砂刀闸阀关闭(2s)。
由此，整个节拍时间为60s，可达到每小时60批的工作效率，大大快于现有技术中144s的节拍时间。

Claims (10)

  1. 一种混砂方法，采用叶片搅拌式混砂机实现，所述混砂机具有砂定量装置及搅拌筒，其特征在于：
    (1)在砂定量装置中设置预混叶片，并设置驱动预混叶片的预混动力机构，使所述砂定量装置构成预混筒；
    (2)在所述搅拌筒上分别设置粉料进料口和液料进料口，所述预混筒的出口经阀连接至所述搅拌筒的粉料进料口，使所述搅拌筒构成终混筒；
    (3)在所述预混筒中进行原砂定量添加、粉状辅料定量添加及原砂与粉状辅料预混作业；
    (4)与粉状辅料预混后的原砂和液体树脂料定量进入终混筒中，驱动搅拌叶旋转，混合均匀后获得所需型砂；
    其中，在终混筒进行搅拌作业时，预混筒中同步进行下一个循环的原砂定量添加、粉状辅料定量添加及原砂与粉状辅料预混作业。
  2. 根据权利要求1所述的混砂方法，其特征在于：将所述终混筒的下部设置成上大下小的锥形结构，将终混筒内的搅拌叶设置成与锥形筒壁平行布置的倾斜式叶片。
  3. 根据权利要求1所述的混砂方法，其特征在于：搅拌叶转速为150～250转/分钟。
  4. 根据权利要求1所述的混砂方法，其特征在于：在所述预混筒下部出口处设置震动装置，在向终混筒送料后开启震动装置以清理预混筒的残留砂。
  5. 根据权利要求1所述的混砂方法，其特征在于：每个工艺节拍时间中，终混筒中搅拌叶旋转搅拌的时间不大于45s。
  6. 一种集成混砂机，包括机架、设置在机架上的终混筒、设置在终混筒内的搅拌叶、驱动搅拌叶的终混动力机构，终混筒顶部设有进料口，底部设有出料口，其特征在于：设有预混筒，所述预混 筒内设有预混叶片，所述预混叶片由预混动力机构驱动，预混筒底端的出口经溜砂管连接至搅拌筒的顶部进料口，溜砂管上设有阀；所述终混筒下部为上大下小的锥形结构，所述搅拌叶具有平行于锥形筒壁布置的倾斜叶片。
  7. 根据权利要求6所述的集成混砂机，其特征在于：所述预混筒为锥形斗，与所述锥形斗配合在机架上设有称重传感器。
  8. 根据权利要求6所述的集成混砂机，其特征在于：所述预混筒的下部出口处设置震动装置。
  9. 根据权利要求6所述的集成混砂机，其特征在于：所述终混筒内设有固定的辅助叶片；所述终混筒底部出口处设有出砂刀闸阀。
  10. 根据权利要求6所述的集成混砂机，其特征在于：所述终混筒顶部与终混动力机构之间设有快速连接机构，可拆式连接所述搅拌叶和所述终混动力机构；预混筒和终混筒上分别开设有维修门。
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