CN202764027U - Concrete mixing feeder and water adding device thereof - Google Patents

Concrete mixing feeder and water adding device thereof Download PDF

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Publication number
CN202764027U
CN202764027U CN 201220359826 CN201220359826U CN202764027U CN 202764027 U CN202764027 U CN 202764027U CN 201220359826 CN201220359826 CN 201220359826 CN 201220359826 U CN201220359826 U CN 201220359826U CN 202764027 U CN202764027 U CN 202764027U
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CN
China
Prior art keywords
water
storehouse
sparge pipe
concrete
ring pipe
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Expired - Fee Related
Application number
CN 201220359826
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Chinese (zh)
Inventor
李刚
王军岭
毛五兴
王玉华
禹保旺
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HENAN ZHIXIN ENGINEERING MACHINERY MANUFACTURING Co Ltd
Zhengzhou Zhixin Mechanical & Electrical Technology Development Co Ltd
Original Assignee
HENAN ZHIXIN ENGINEERING MACHINERY MANUFACTURING Co Ltd
Zhengzhou Zhixin Mechanical & Electrical Technology Development Co Ltd
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Publication date
Application filed by HENAN ZHIXIN ENGINEERING MACHINERY MANUFACTURING Co Ltd, Zhengzhou Zhixin Mechanical & Electrical Technology Development Co Ltd filed Critical HENAN ZHIXIN ENGINEERING MACHINERY MANUFACTURING Co Ltd
Priority to CN 201220359826 priority Critical patent/CN202764027U/en
Application granted granted Critical
Publication of CN202764027U publication Critical patent/CN202764027U/en
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Abstract

The utility model discloses a concrete mixing feeder and a water adding device thereof. The feeder comprises a frame, and an upper spiral distribution mechanism provided with a distribution bin and a lower spiral mixing conveying mechanism provided with a mixing conveying bin are mounted on the frame. A discharge passage for discharging proportioned material is arranged between the distribution bin and the mixing conveying bin, the water adding device is further mounted on the frame and comprises spray pipes peripherally disposed along the discharge passage and mounted at the position of the discharge passage, a flowing area for the discharged material to pass through is arranged between the spray pipes, and the spray pipes are provided with spray holes facing the flowing area to form a high-pressure water curtain. The spray pipes are provided with the spray holes to allow high-pressure water entering the spray pipes to form the water curtain, water is convenient to fully mix in material discharging process and even in mixing, quantitative proportion of material is guaranteed while full humidification of material can be achieved effectively, and mixing quality of concrete can be increased.

Description

A kind of concrete-agitating feeder and priming apparatus thereof
Technical field
The utility model relates to a kind of device that integrates concrete proportioning, stirring and conveying, is specifically related to a kind of double-layer spiral wet type and stirs feeder.
Background technology
Concrete-agitating feeder in the market is of a great variety, but large multi-functional uneven complete, be mainly manifested in and adopt artificial batching, be subjected to the restriction of some construction sites, there is inconvenience in artificial batching, and the proportioning of material (cement and sandstone) is not easy to hold, and adds to stir inhomogeneously, directly affects concrete mixing quality.
Chinese patent CN201073806Y discloses a kind of Novel helical agitating appending machine, adopt two-layer helical structure, comprise the spiral batching machine structure on upper strata and the stirring screw conveyer structure of lower floor, be rotatably equipped with the batching screw feeder in the batch bin of spiral batching machine structure, the batching screw feeder is made of the rotation direction of blade opposite sandstone spiral section and cement spiral section, upside at batch bin is provided with corresponding with sandstone spiral section and cement spiral section respectively sand hopper and cement hopper, sandstone and cement are entered in the batch bin by sand hopper and cement hopper respectively like this, and are delivered to the docking location place of sandstone spiral section and cement spiral section under the effect of batching screw feeder.The stirring of stirring screw conveyer structure carries storehouse and batch bin to be fixedly installed, in stirring the conveying storehouse, be rotatably equipped with the conveying screw feeder that is arranged in juxtaposition with the screw feeder of preparing burden, downside at the batching screw feeder is provided with the blanking port corresponding with the docking location of sandstone spiral section and cement spiral section, material is fallen to stir by blanking port and carries in the storehouse, at last by carrying screw feeder to send.The helical agitating appending machine of this employing double-layer spiral structure, the quantitative proportioning that the sandstone spiral section of dependence spiral batching machine structure and cement spiral section can be realized material adds mixing, and the abundant stirring of dependence stirring screw conveyer structure, mixing effect is desirable, each proportioning material is adjustable continuously, in addition, whole double-layer spiral structure can realize the adjusting of angled conveyor by inclination-angle regulating device, is particularly suitable for the underworkings construction.
But, how material is realized in whipping process and fully the mixing of water, to guarantee also to add that water level is put and amount of water is just right, so that the water stirring that adds of material also becomes a key issue, and whole equipment lacks an effective priming apparatus, in conjunction with existing most of concrete-agitating feeders, priming apparatus may be summarized to be following two types: a kind of is to introduce in the stirring conveying storehouse after directly hose being connected in use the water source; Another kind is in stirring the conveying storehouse humidifier or sprayer unit to be installed.Two kinds of situations all are to carry out humidification in the material stirring process, can't realize that the abundant humidification of material stirs, and affect concrete quality.
The utility model content
The purpose of this utility model provides a kind of when guaranteeing that material can quantitative proportioning adds, and can also effectively finish the concrete-agitating feeder of material humidification mix and blend, and the priming apparatus of concrete-agitating feeder is provided simultaneously.
Concrete-agitating feeder of the present utility model adopts following technical scheme: a kind of concrete-agitating feeder, comprise frame, the spiral batching machine structure with batch bin of arranging up and down is installed on the frame and has and stir the stirring screw conveyer structure of carrying the storehouse, the blanking channel that is provided with between the storehouse to fall for the good material of proportioning is carried in described batch bin and stirring, priming apparatus also is installed on the described frame, priming apparatus comprises the sparge pipe along the blanking channel circumferential arrangement that is installed in the blanking channel position, have the circulating area that passes through for the material that falls between the sparge pipe, and offer on the sparge pipe towards circulating area to form the hole for water spraying of high pressure water curtain.
Described sparge pipe is in turn connected to form ring pipe, and described circulating area is the zone at the endoporus place of ring pipe, and described hole for water spraying is along the circumferential spaced apart inboard that is located at sparge pipe of ring pipe.
The outside of described ring pipe go back fixed cover be provided with along ring pipe radially extend with material by the time prevent that dust from overflowing and material water produces the sealing shroud that splashes after mixing.
Described priming apparatus also comprises the moisturizing shower nozzle between the discharge end that is arranged on blanking port and stirs the conveying storehouse, and the water jet of described moisturizing shower nozzle is carried in the storehouse so that the material that stirs is carried out humidification towards stirring.
Described stirring is carried in the storehouse and is rotatably equipped with the conveying screw feeder, carry the pitch of the helical blade of screw feeder to be increased gradually to discharge end by the feeding end, the mode that pitch increases has two kinds, a kind of is that pitch increases progressively one by one, another kind is that helical blade is divided into multistage, pitch for increase progressively piecemeal and each section in the pitch of helical blade equate.
The pitch of the helical-blade of described conveying screw feeder is for increasing progressively piecemeal, and carrying the screw feeder section between described blanking channel and feeding end is the initial segment, and the conveying screw feeder section between blanking channel and discharge end is followed successively by interlude and end section; Helical blade corresponding to described the initial segment is solid vane, and the helical blade of described interlude and end section correspondence is hollow blade.
Priming apparatus of the present utility model adopts following technical scheme: a kind of priming apparatus, comprise be used to the sparge pipe along the blanking channel circumferential arrangement that is installed in the blanking channel position, have the circulating area that passes through for the material that falls between the sparge pipe, and offer on the sparge pipe towards circulating area to form the hole for water spraying of high pressure water curtain.
Described sparge pipe is in turn connected to form ring pipe, and described circulating area is the zone at the endoporus place of ring pipe, and described hole for water spraying is along the circumferential spaced apart inboard that is located at sparge pipe of ring pipe.
The outside of described ring pipe go back fixed cover be provided with along ring pipe radially extend with material by the time prevent that dust from overflowing and material water produces the sealing shroud that splashes after mixing.
Described priming apparatus also comprises the moisturizing shower nozzle between the discharge end that is arranged on blanking port and stirs the conveying storehouse, and the water jet of described moisturizing shower nozzle is carried in the storehouse so that the material that stirs is carried out humidification towards stirring.
Adopt concrete-agitating feeder and the priming apparatus thereof of said structure, because the sparge pipe of priming apparatus is arranged on the blanking channel position, and the circulating area that has the material process that supplies to fall between the sparge pipe, the hole for water spraying of offering at sparge pipe is so that the water under high pressure that enters in the sparge pipe forms the high pressure water curtain, making material be convenient to water in dropping process fully mixes, and mix, in the quantitative proportioning that guarantees material, also can effectively realize the abundant humidification of material, help to improve concrete mixing quality.
In addition, be installed in and stir the moisturizing shower nozzle of carrying in the storehouse, can carry out the secondary moisturizing to the material that in stirring the conveying storehouse, stirs, material and water are mixed more even.
Description of drawings
Fig. 1 is the structural representation of the embodiment of concrete-agitating feeder of the present utility model;
Fig. 2 is the top view of Fig. 1;
Fig. 3 is the structural representation of the priming apparatus among Fig. 1;
Fig. 4 is the top view of Fig. 3;
Fig. 5 is water replanishing device among Fig. 3 and the assembling schematic diagram of sealing shroud;
Fig. 6 is the top view of Fig. 5;
Fig. 7 is the assembling schematic diagram of a water replanishing device among Fig. 5.
Fig. 8 is the structural representation of the spiral batching machine structure among Fig. 1;
Fig. 9 is the top view of Fig. 8;
Figure 10 is the structural representation of the stirring screw conveyer structure among Fig. 1;
Figure 11 is the top view of Figure 10.
The specific embodiment
The embodiment of concrete-agitating feeder of the present utility model: shown in Fig. 1-11, two-layer helical structure is installed on the frame 1, comprise the spiral batching machine structure that is positioned at the upper strata and the stirring screw conveyer structure of lower floor, the batch bin 10 of spiral batching machine structure is carried storehouse 4 to be connected up and down with the stirring of stirring screw conveyer structure and is formed an integrally-built spiral storehouse, one end in spiral storehouse rotates and is assemblied on the frame 1, the other end tilts up, simultaneously in frame 1 inclination-angle regulating device 3 that the spiral storehouse is supported is installed, by inclination-angle regulating device 3 can the adjustable screw storehouse the angle of inclination.Be rotatably equipped with the batching screw feeder 101 that extends along its incline direction in the described batch bin 10, batching screw feeder 101 is formed by the cement spiral section of epimere and the sandstone spiral section docking of hypomere, the helical blade of cement spiral section is just in time opposite with the rotation direction of the helical blade of sandstone spiral section, upside at batch bin 10 is equipped with corresponding with cement spiral section and sandstone spiral section respectively cement hopper 8 and sand hopper 11, offers the blanking port 102 corresponding with stirring the upper side opening of carrying the storehouse at the downside of batch bin 10; Described stirring is carried in the storehouse 4 and is rotatably equipped with the conveying screw feeder 41 that is arranged in juxtaposition with the screw feeder 101 of preparing burden, carrying the upper end of screw feeder 41 is that discharge end, lower end are the feeding end, offer the feeding mouth corresponding with blanking port 42 at the upside that stirs conveying storehouse 4, between blanking port 102 and feeding mouth 42, formed like this blanking channel that passes through for the good material of proportioning.During work, cement and sandstone are entered in the batch bin 10 by cement hopper 8 and sand hopper 11 respectively, and under the effect of batching screw feeder 101, be delivered to respectively blanking port, this process implementation the quantitative proportioning of material, then fallen to stir by blanking port 102 and carry in the storehouse 4, at last by carrying screw feeder to carry storehouse 4 to send by stirring.Above part is prior art or can realizes by prior art.Improvements of the present utility model are: water replanishing device is installed one time between described blanking port 102 and the feeding mouth 42, comprise two up and down ring pipes 9 of stack setting, the endoporus of two ring pipes 9 is corresponding up and down with blanking port or feeding mouth, so that the good material endoporus through ring pipe when falling of proportioning enters in the stirring conveying storehouse 4 circulating area of the endoporus of ring pipe 9 for falling for material.Offer circumferential spaced apart hole for water spraying in the inboard of ring pipe 9, the outside offers a water inlet, each hole for water spraying tilts down, and the angle between the radial direction of the axial direction of each hole for water spraying and ring pipe 9 is 45 °, and the water inlet position of two ring pipes 9 is connected with a water inlet pipe 93 jointly.Connect the first pipeline 91 on the water inlet pipe 93, send into water under high pressure by the first pipeline 91 and water inlet pipe 93 in the ring pipe 9 after, water under high pressure forms water curtain by each hole for water spraying ejection, thereby sandstone and cement are fully mixed with water when the whereabouts.Because material can produce dust in dropping process, and also can occur splashing when mixing with water, in order to prevent that dust from overflowing and material water splashes out, also be arranged with sealing shroud 14 in the outside of two ring pipes 9, the material of sealing shroud 14 adopts rubber.
Described stirring is carried on the storehouse 4 the secondary water replanishing device also is installed, comprise the moisturizing shower nozzle 13 that is arranged on blanking port and stirs the position between the discharge end of carrying the storehouse, moisturizing shower nozzle 13 is the cone barrel structure of both ends open, its little end opening is that water inlet, large end opening are water jet, the water jet of moisturizing shower nozzle 13 is vertically towards carrying screw feeder 41, be connected with the second pipeline 131 in the water inlet of moisturizing shower nozzle 13, in moisturizing shower nozzle 13, send into water under high pressure by the second pipeline 131, can be to stirring the additional water that adds of the material of carrying the stirring in the storehouse 4.
The required water under high pressure of material provides by rack-mounted water pump 2, the delivery port of water pump 2 is connected with main line 21, described the first pipeline 91, the second pipeline 131 all are connected with main line 21, in addition, in order to realize quantitative water supply, the first stop valve 92 of control ring pipe break-make is installed at the first pipeline 91, the second stop valve 132 of control moisturizing shower nozzle break-make is installed at the second pipeline 131.Because water pump 2 provides water under high pressure, in order to prevent the main line superpressure, also is connected with overflow pipe 151 on main line 21, and overflow valve 15 is installed on the overflow pipe.
Specifically as shown in Figure 3, Figure 4, a described water replanishing device, secondary water replanishing device, water pump and the pipeline between them etc. have formed a complete priming apparatus, wherein ring pipe 9 provides humidification one time in the process that material falls, the moisturizing shower nozzle provides secondary humidifying in the material stirring process, thereby guarantees that material and water fully mix.Also be provided with a giant 12 in frame, giant is connected with main line 21 by the 3rd pipeline 121, when stirring carries the storehouse to clean, provides water under high pressure by water pump 2 for giant 12.
Described conveying screw feeder 41 is divided into three sections, and wherein the conveying screw feeder section between blanking channel and the feeding end is the initial segment 411, and the screw feeder transportation section between blanking channel and the discharge end is followed successively by interlude 412 and end section 413.The helical blade of the initial segment 411 correspondences is solid vane, and the pitch of the helical blade of the initial segment 411 correspondences equates; The helical blade of interlude 412 and end section 413 correspondences is hollow blade, and the pitch of the helical blade of interlude 412 correspondences is equal, and the pitch of the helical blade of end section 413 correspondences equates.In addition, the initial segment 411, interlude 412 and end section 413 respectively the pitch of corresponding helical blade increase progressively successively.
The rotation of batching screw feeder 101 and conveying screw feeder 41 provides power by being installed in the motor 5 that stirs on the conveying storehouse 4, motor 5 is in transmission connection with batching screw feeder 101 by electrodeless variable-speed motor 6 and reductor 7 successively, and batching screw feeder 101 is in transmission connection by the sprocket wheel chain with carrying screw feeder 41, like this under the driving of motor 5, can make the batching screw feeder and carry screw feeder to work simultaneously, electrodeless variable-speed motor 6 is as arrangements for speed regulation, can regulate the rotating speed of batching screw feeder and conveying screw feeder, to adapt to the pulp shooting machine of different production capacity.
During above-described embodiment specific works, press the spiral control button of two-layer screw mechanism and the control button of priming apparatus, batching screw feeder 101 and conveying screw feeder 41 rotate simultaneously.Two spiral sections of batching screw feeder 101 are delivered to blanking port with the cement in the cement hopper and the sandstone in the sand hopper respectively, and fallen to by blanking port 102 and stir to carry in the storehouse 4, one road water under high pressure of priming apparatus is by ring pipe 9 ejections, and at blanking channel place formation water curtain, sandstone, cement and water are fully mixed; Simultaneously, stir 41 pairs of materials of conveying screw feeder of carrying in the storehouse 4 and carry out mix and blend, another road water under high pressure of priming apparatus is added in the material of stirring by the moisturizing shower nozzle, material and water is mixed more even.When whole equipment quits work when need cleaning, open flushing valve, close simultaneously the first stop valve 92 and the second stop valve 132, the Third Road water under high pressure of priming apparatus is realized the flushing of carrying storehouse 4 to stirring by giant 12 ejections.
In above-described embodiment, ring pipe adopts loop configuration, can think to be in turn connected to form by independent arc sparge pipe, therefore, in other embodiments, also can adopt circumferentially spaced apart plural sparge pipe structure, and circulating area is the zone between each sparge pipe.
In above-described embodiment, the effect of water pump is to provide water under high pressure, and in other embodiments, water pump also can directly be connected with giant with sparge pipe, moisturizing shower nozzle at the construction field (site) as external equipment.
In other embodiments, also moisturizing shower nozzle and the second pipeline can be set, also can be realized separately the humidification of material by sparge pipe.
In above-described embodiment, the pitch between the helical blade of conveying screw feeder adopts the mode that increases progressively piecemeal, in other embodiments, also can adopt the mode that increases progressively gradually.
The embodiment of priming apparatus of the present utility model: shown in Fig. 1-7, the structure of the priming apparatus in its structure and above-described embodiment is consistent, and its content does not repeat them here.

Claims (10)

1. concrete-agitating feeder, comprise frame, the spiral batching machine structure with batch bin of arranging up and down is installed on the frame and has and stir the stirring screw conveyer structure of carrying the storehouse, the blanking channel that is provided with between the storehouse to fall for the good material of proportioning is carried in described batch bin and stirring, priming apparatus also is installed on the described frame, it is characterized in that: priming apparatus comprises the sparge pipe along the blanking channel circumferential arrangement that is installed in the blanking channel position, have the circulating area that passes through for the material that falls between the sparge pipe, and offer on the sparge pipe towards circulating area to form the hole for water spraying of high pressure water curtain.
2. concrete-agitating feeder according to claim 1, it is characterized in that: described sparge pipe is in turn connected to form ring pipe, described circulating area is the zone at the endoporus place of ring pipe, and described hole for water spraying is along the circumferential spaced apart inboard that is located at sparge pipe of ring pipe.
3. concrete-agitating feeder according to claim 2 is characterized in that: the outside of described ring pipe go back fixed cover be provided with along ring pipe radially extend with material by the time prevent that dust from overflowing and material water produces the sealing shroud that splashes after mixing.
4. according to claim 1 and 2 or 3 described concrete-agitating feeders, it is characterized in that: described priming apparatus also comprises the moisturizing shower nozzle between the discharge end that is arranged on blanking port and stirs the conveying storehouse, and the water jet of described moisturizing shower nozzle is carried in the storehouse so that the material that stirs is carried out humidification towards stirring.
5. concrete-agitating feeder according to claim 1, it is characterized in that: described stirring is carried in the storehouse and is rotatably equipped with the conveying screw feeder, carry the pitch of the helical blade of screw feeder to be increased gradually to discharge end by the feeding end, the mode that pitch increases has two kinds, a kind of is that pitch increases progressively one by one, another kind is that helical blade is divided into multistage, pitch for increase progressively piecemeal and each section in the pitch of helical blade equate.
6. concrete-agitating feeder according to claim 5, it is characterized in that: the pitch of the helical-blade of described conveying screw feeder is for increasing progressively piecemeal, carrying the screw feeder section between described blanking channel and feeding end is the initial segment, and the conveying screw feeder section between blanking channel and discharge end is followed successively by interlude and end section; Helical blade corresponding to described the initial segment is solid vane, and the helical blade of described interlude and end section correspondence is hollow blade.
7. priming apparatus, it is characterized in that: comprise be used to the sparge pipe along the blanking channel circumferential arrangement that is installed in the blanking channel position, have the circulating area that passes through for the material that falls between the sparge pipe, and offer on the sparge pipe towards circulating area to form the hole for water spraying of high pressure water curtain.
8. priming apparatus according to claim 7, it is characterized in that: described sparge pipe is in turn connected to form ring pipe, and described circulating area is the zone at the endoporus place of ring pipe, and described hole for water spraying is along the circumferential spaced apart inboard that is located at sparge pipe of ring pipe.
9. priming apparatus according to claim 8 is characterized in that: the outside of described ring pipe go back fixed cover be provided with along ring pipe radially extend with material by the time prevent that dust from overflowing and material water produces the sealing shroud that splashes after mixing.
10. according to claim 7 or 8 or 9 described priming apparatus, it is characterized in that: described priming apparatus also comprises the moisturizing shower nozzle between the discharge end that is arranged on blanking port and stirs the conveying storehouse, and the water jet of described moisturizing shower nozzle is carried in the storehouse so that the material that stirs is carried out humidification towards stirring.
CN 201220359826 2012-07-24 2012-07-24 Concrete mixing feeder and water adding device thereof Expired - Fee Related CN202764027U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220359826 CN202764027U (en) 2012-07-24 2012-07-24 Concrete mixing feeder and water adding device thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220359826 CN202764027U (en) 2012-07-24 2012-07-24 Concrete mixing feeder and water adding device thereof

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CN202764027U true CN202764027U (en) 2013-03-06

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104118054A (en) * 2014-07-15 2014-10-29 翁兴星 Concrete mixing transport vehicle
CN104399575A (en) * 2014-12-02 2015-03-11 长沙石立超硬材料有限公司 Diamond washing device and application method thereof
CN105054224A (en) * 2015-08-18 2015-11-18 德阳华宇瑞得智能科技有限公司 Airing bed system for solid state fermentation of foods
CN105053826A (en) * 2015-08-18 2015-11-18 德阳华宇瑞得智能科技有限公司 Feeding machine for food solid state fermentation
CN105619616A (en) * 2016-01-27 2016-06-01 招金矿业股份有限公司蚕庄金矿 Dust-free cement conveying device
CN109502373A (en) * 2018-12-28 2019-03-22 河南省煤科院科明机电设备有限公司 Shaftless screw ingredient stirs feeder
CN117071903A (en) * 2023-10-17 2023-11-17 吉林省星辰科技服务有限公司 Building material lifting machine structure

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104118054A (en) * 2014-07-15 2014-10-29 翁兴星 Concrete mixing transport vehicle
CN104399575A (en) * 2014-12-02 2015-03-11 长沙石立超硬材料有限公司 Diamond washing device and application method thereof
CN105054224A (en) * 2015-08-18 2015-11-18 德阳华宇瑞得智能科技有限公司 Airing bed system for solid state fermentation of foods
CN105053826A (en) * 2015-08-18 2015-11-18 德阳华宇瑞得智能科技有限公司 Feeding machine for food solid state fermentation
CN105053826B (en) * 2015-08-18 2019-03-08 四川华宇瑞得科技有限公司 Batcher for food solid state fermentation
CN105054224B (en) * 2015-08-18 2019-03-19 四川华宇瑞得科技有限公司 The bed system that dries in the air for food solid state fermentation
CN105619616A (en) * 2016-01-27 2016-06-01 招金矿业股份有限公司蚕庄金矿 Dust-free cement conveying device
CN105619616B (en) * 2016-01-27 2018-07-13 招金矿业股份有限公司蚕庄金矿 A kind of device of dustless conveying cement
CN109502373A (en) * 2018-12-28 2019-03-22 河南省煤科院科明机电设备有限公司 Shaftless screw ingredient stirs feeder
CN109502373B (en) * 2018-12-28 2023-08-29 河南省煤科院科明机电设备有限公司 Shaftless spiral batching stirring feeder
CN117071903A (en) * 2023-10-17 2023-11-17 吉林省星辰科技服务有限公司 Building material lifting machine structure
CN117071903B (en) * 2023-10-17 2023-12-22 吉林省星辰科技服务有限公司 Building material lifting machine structure

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