CN112025986A - Concrete configuration professional equipment - Google Patents
Concrete configuration professional equipment Download PDFInfo
- Publication number
- CN112025986A CN112025986A CN202010846286.0A CN202010846286A CN112025986A CN 112025986 A CN112025986 A CN 112025986A CN 202010846286 A CN202010846286 A CN 202010846286A CN 112025986 A CN112025986 A CN 112025986A
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- China
- Prior art keywords
- blanking
- hopper
- assembly
- bin
- water outlet
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
- 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
- B28C5/0856—Supporting frames or structures, e.g. supporting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/12—Supplying or proportioning liquid ingredients
- B28C7/126—Supply means, e.g. nozzles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention relates to configuration equipment, in particular to special equipment for concrete configuration. The invention aims to solve the technical problem of how to design special concrete configuration equipment which does not need to manually and frequently put raw materials in operation. In order to solve the above technical problem, the present invention provides a concrete arrangement dedicated apparatus, comprising: the top of the base is connected with a rack; the stirrer is connected to one side of the top of the base, and the feeding end of the stirrer is connected with a feeding hopper; the bin is connected to the rack and is positioned above the feed hopper; the link, it is a plurality of settings, and a plurality of links are connected in feed bin extrados cambered surface lower part along the even interval of circumference, are connected with down the hopper on the link. The beneficial effects are that: the concrete mixer is matched with the material storage bin, the water storage assembly, the blanking assembly and the material blocking assembly, so that the effect of mixing the concrete is achieved.
Description
Technical Field
The invention relates to configuration equipment, in particular to special equipment for concrete configuration.
Background
The concrete is one of the most important civil engineering materials in the present generation, and is an artificial stone material prepared by mixing a cementing material, granular aggregate (also called aggregate), water, an additive and an admixture which are added if necessary according to a certain proportion, uniformly stirring, densely molding, curing and hardening. The concrete needs to mix different raw materials together in the manufacturing process.
Through the retrieval, the patent that granted patent publication number is CN111113672A discloses a concrete mixing arrangement that cement was automatic to be put in, including the mixing box, be equipped with the opening towards left and towards the mixing chamber of right in the mixing box, the mixing chamber is equipped with concrete mixing arrangement, concrete mixing arrangement is used for stirring the concrete raw materials and mixes, mixing chamber right side opening part is equipped with upset conveyor, upset conveyor carries the cement bag through rotary motion in the mixing chamber, and can be with empting behind the cement bag carries the outside to be stored, the mixing intracavity is equipped with and is located the left cement bag clamping device of concrete mixing arrangement, above-mentioned patent exists following not enoughly: other raw materials are required to be fed manually and frequently, labor is consumed during operation, and the requirements of people cannot be met.
Therefore, it is necessary to develop a special concrete preparation device which does not require frequent manual feeding of raw materials during operation.
Disclosure of Invention
(1) Technical problem to be solved
In order to overcome the defects that other raw materials need to be fed manually frequently and manpower is consumed during operation in the above patent, the invention provides special concrete configuration equipment which does not need to feed raw materials manually frequently during operation.
(2) Technical scheme
In order to solve the technical problem, the invention provides a special device for concrete configuration, which comprises a base, wherein the top of the base is connected with a rack; the stirrer is connected to one side of the top of the base, and the feeding end of the stirrer is connected with a feeding hopper; the bin is connected to the rack and is positioned above the feed hopper; the connecting frames are arranged in a plurality of ways, the connecting frames are uniformly connected to the lower part of the outer arc surface of the storage bin at intervals along the circumferential direction, a blanking hopper is connected onto the connecting frames, a certain gap is reserved between the blanking hopper and the bottom of the storage bin, the blanking hopper is positioned below the storage bin, and a blanking port is formed in the blanking hopper and is aligned to the feeding hopper; the partition plates are arranged in a plurality of blocks, and the plurality of partition plates are uniformly connected in the storage bin at intervals along the circumferential direction; the water storage assembly is arranged in the stock bin; the blanking assembly is arranged on the stock bin; the material blocking assembly is arranged between the water storage assembly and the blanking assembly.
Preferably, the water storage component comprises a water storage barrel which is connected to the middle part in the storage bin, and the top of the water storage barrel is connected with a water inlet pipe; and the water outlet pipe is connected to the bottom of the water storage barrel, a water outlet valve is connected to the water outlet pipe, and the discharge end of the water outlet pipe is aligned to the feed hopper.
Preferably, the blanking assembly comprises a servo motor, the servo motor is arranged on one side of the storage bin, and an output shaft of the servo motor is connected with a pinion; the large disc is rotatably connected to the bottom of the storage bin, is positioned in a gap between the storage bin and the blanking hopper, and is provided with three blanking holes at equal intervals along the circumferential direction, and the blanking holes can move to the position above the feeding end of the blanking hopper; and the gear ring is connected to the outer arc surface of the large disc, and the pinion is meshed with the gear ring.
Preferably, the material blocking assembly comprises a small disc which is connected to the water outlet pipe in a sliding manner, a plurality of arc-shaped material blocking plates are uniformly connected to the small disc at intervals along the circumferential direction, and the arc-shaped material blocking plates can block the blanking port; the wedge-shaped blocks are arranged in a plurality of blocks, and the plurality of wedge-shaped blocks are uniformly connected to the tops of the small disks at intervals along the circumferential direction; the spring is connected between the small disc and the water storage barrel; and the pushing rod is connected to the bottom of the large disc and matched with the wedge-shaped block.
Preferably, the automatic valve assembly comprises a sliding sleeve which is connected to the lower part of the water outlet pipe in a sliding manner, a connecting rod is connected to the sliding sleeve, and a blocking block is connected to the connecting rod and can block the liquid outlet end of the water outlet pipe; the rotary plate is connected to the water outlet pipe in a rotary mode, a first connecting rod is hinged between the rotary plate and the small circular plate, and a second connecting rod is hinged between the rotary plate and the blocking block.
(3) Advantageous effects
1. The concrete mixer is matched with the material storage bin, the water storage assembly, the blanking assembly and the material blocking assembly, so that the effect of mixing the concrete is achieved.
2. The automatic valve assembly assists the water storage assembly to operate, so that the water storage assembly does not need to be operated frequently by manpower, and the manpower is effectively saved.
3. The invention only needs to quantitatively add raw materials through the material blocking assembly during operation, and only needs to manually pour more materials into the storage bin when the amount of the materials is small, and does not need frequent filling, thereby effectively solving the technical problems in the patents.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a first perspective view of a partial structure of the present invention.
Fig. 3 is a second perspective view of a portion of the present invention.
Fig. 4 is a schematic perspective view of a water storage assembly according to the present invention.
Fig. 5 is a schematic perspective view of the blanking assembly of the present invention.
Fig. 6 is a schematic perspective view of the striker assembly of the present invention.
FIG. 7 is a perspective view of the automatic valve assembly of the present invention.
The labels in the figures are: 1-base, 2-frame, 3-mixer, 4-feed hopper, 5-bunker, 51-link, 52-blanking hopper, 53-blanking mouth, 6-baffle, 7-water storage component, 71-water storage barrel, 72-water inlet pipe, 73-water outlet pipe, 74-water outlet valve, 8-blanking component, 81-servo motor, 82-pinion, 83-gear ring, 84-blanking hole, 85-large disc, 9-baffle component, 91-small disc, 92-arc baffle, 93-wedge block, 94-spring, 95-push rod, 10-automatic valve component, 101-sliding sleeve, 102-connecting rod, 103-block, 104-rotating disc, 105-first connecting rod, 106-second link.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example 1
A concrete configuration special device is shown in figures 1 to 6 and comprises a base 1, a frame 2, a stirrer 3, a feed hopper 4, a bin 5, a connecting frame 51, a discharging hopper 52 and partition plates 6, wherein the top of the base 1 is connected with the frame 2, the right side of the top of the base 1 is connected with the stirrer 3, the feeding end of the stirrer 3 is connected with the feed hopper 4, the bin 5 is arranged on the frame 2, the bin 5 is positioned above the feed hopper 4, the lower part of the outer arc surface of the bin 5 is uniformly and circumferentially connected with three connecting frames 51 at intervals, the connecting frames 51 are connected with the discharging hopper 52, a certain gap is formed between the discharging hopper 52 and the bottom of the bin 5, the discharging hopper 52 is positioned below the bin 5, the discharging hopper 52 is provided with a discharging opening 53, the discharging opening 53 is aligned with the feed hopper 4, the bin 5 is internally connected with three partition plates 6 at uniform circumferential intervals, a water storage, a water storage assembly 7 is arranged in the stock bin 5, a blanking assembly 8 is arranged on the stock bin 5, and a material blocking assembly 9 is arranged between the water storage assembly 7 and the blanking assembly 8.
The water storage component 7 comprises a water storage tank 71, a water inlet pipe 72, a water outlet pipe 73 and a water outlet valve 74, the middle part in the storage bin 5 is connected with the water storage tank 71, the top of the water storage tank 71 is connected with the water inlet pipe 72, the bottom of the water storage tank 71 is connected with the water outlet pipe 73, the water outlet pipe 73 is connected with the water outlet valve 74, and the discharge end of the water outlet pipe 73 is aligned to the feed hopper 4.
Unloading subassembly 8 is including servo motor 81, pinion 82, ring gear 83 and big disc 85, servo motor 81 is installed on the left side of feed bin 5, be connected with pinion 82 on servo motor 81's the output shaft, 5 bottom rotary types of feed bin are connected with big disc 85, big disc 85 is arranged in the clearance between feed bin 5 and the lower hopper 52, it has three blanking hole 84 to go up along the even interval of circumference on the big disc 85, blanking hole 84 can remove to the pan feeding end top of lower hopper 52, big disc 85 extrados is connected with ring gear 83, pinion 82 meshes with ring gear 83.
The material blocking assembly 9 comprises a small circular disc 91, arc-shaped material blocking plates 92, wedge-shaped blocks 93, springs 94 and a push rod 95, the water outlet pipe 73 is connected with the small circular disc 91 in a sliding mode, the small circular disc 91 is connected with the three arc-shaped material blocking plates 92 at even intervals along the circumferential direction, the arc-shaped material blocking plates 92 can block the blanking port 53, the top of the small circular disc 91 is connected with the three wedge-shaped blocks 93 at even intervals along the circumferential direction, the springs 94 are connected between the small circular disc 91 and the water storage cylinder 71, the bottom of the large circular disc 85 is connected with the push rod 95, and the push rod 95 is matched with the wedge.
When concrete needs to be configured, the device can be used, initially, the spring 94 is in a stretching state, firstly, a user can place different raw materials in different parts in the storage bin 5 and separate the raw materials through the partition plate 6, the raw materials in the storage bin 5 fall into the blanking hopper 52 through the blanking hole 84, the raw materials in the blanking hopper 52 are blocked by the arc-shaped baffle plate 92, then the user can add water into the water storage cylinder 71 through the water inlet pipe 72, then the servo motor 81 is started to drive the pinion 82 to rotate, the pinion 82 rotates to drive the large disc 85 to rotate through the gear ring 83, the large disc 85 rotates to drive all devices on the large disc to rotate together, when the part of the large disc 85 which is not provided with the blanking hole 84 rotates to the upper part of the blanking hopper 52, the large disc 85 can block the feeding end of the blanking hopper 52, when the push rod 95 rotates to be not contacted with the wedge-shaped block 93 any more, the small disc 91 moves upwards under the action, the small disc 91 moves upwards to drive all devices on the small disc to move upwards together, when the arc-shaped baffle plate 92 moves to a position where the arc-shaped baffle plate no longer blocks the blanking port 53, the water outlet valve 74 can be opened, water in the water storage cylinder 71 flows into the feeding hopper 4 through the water outlet pipe 73, raw materials in the blanking hopper 52 also flow into the feeding hopper 4 through the blanking port 53, at the moment, the stirring machine 3 can be started, and the raw materials in the feeding hopper 4 flow into the stirring machine 3 to be stirred, so that concrete is prepared, and therefore the concrete can be prepared.
Example 2
On the basis of embodiment 1, as shown in fig. 7, the automatic valve assembly 10 is further included, the automatic valve assembly 10 includes a sliding sleeve 101, a connecting rod 102, a blocking block 103, a rotating disc 104, a first connecting rod 105 and a second connecting rod 106, the sliding sleeve 101 is slidably connected to the lower portion of the water outlet pipe 73, the connecting rod 102 is connected to the sliding sleeve 101, the blocking block 103 is connected to the connecting rod 102, the blocking block 103 can block the water outlet end of the water outlet pipe 73, the rotating disc 104 is rotatably connected to the water outlet pipe 73, the first connecting rod 105 is hinged between the rotating disc 104 and the small circular disc 91, and the second connecting rod 106 is hinged between the rotating disc 104 and the blocking block 103.
Because the liquid outlet end of the water outlet pipe 73 is blocked by the blocking block 103, the water outlet valve 74 can be opened all the time, the small circular disc 91 drives the rotary disc 104 to rotate forward and backward alternately through the first connecting rod 105 when moving up and down, the rotary disc 104 rotates forward and backward alternately and drives the blocking block 103 to move up and down through the connecting rod, the blocking block 103 does not block the liquid outlet end of the water outlet pipe 73 after moving down, the blanking port 53 on the blanking hopper 52 is just in an open state at this time, and thus, the arc-shaped baffle plate 92 does not need to be operated manually frequently, and manpower is effectively saved.
The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A concrete configuration professional equipment, characterized by, including: the top of the base (1) is connected with a frame (2); the stirrer (3) is connected to one side of the top of the base (1), and a feeding end of the stirrer (3) is connected with a feeding hopper (4); the bin (5) is connected to the rack (2), and the bin (5) is positioned above the feed hopper (4); the connecting frames (51) are arranged in a plurality of ways, the connecting frames (51) are uniformly connected to the lower part of the outer arc surface of the storage bin (5) at intervals along the circumferential direction, a blanking hopper (52) is connected onto the connecting frames (51), a certain gap is formed between the blanking hopper (52) and the bottom of the storage bin (5), the blanking hopper (52) is positioned below the storage bin (5), a blanking port (53) is formed in the blanking hopper (52), and the blanking port (53) is aligned to the feeding hopper (4); the partition plates (6) are arranged in a plurality of blocks, and the plurality of partition plates (6) are uniformly connected in the storage bin (5) at intervals along the circumferential direction; a water storage assembly (7) arranged in the stock bin (5); the blanking assembly (8) is arranged on the stock bin (5); the material blocking assembly (9) is arranged between the water storage assembly (7) and the blanking assembly (8).
2. A concrete dispensing dedicated apparatus as claimed in claim 1, wherein the water storage unit (7) comprises: the water storage cylinder (71) is connected to the middle part in the storage bin (5), and the top of the water storage cylinder (71) is connected with a water inlet pipe (72); the water outlet pipe (73) is connected to the bottom of the water storage cylinder (71), a water outlet valve (74) is connected to the water outlet pipe (73), and the discharge end of the water outlet pipe (73) is aligned to the feed hopper (4).
3. A concrete distribution plant, according to claim 2, characterized in that said blanking assembly (8) comprises: the servo motor (81) is arranged on one side of the storage bin (5), and a pinion (82) is connected to an output shaft of the servo motor (81); the large disc (85) is rotatably connected to the bottom of the storage bin (5), the large disc (85) is positioned in a gap between the storage bin (5) and the blanking hopper (52), three blanking holes (84) are uniformly formed in the large disc (85) at intervals along the circumferential direction, and the blanking holes (84) can move to the position above the feeding end of the blanking hopper (52); and the gear ring (83) is connected to the outer arc surface of the large disc (85), and the pinion (82) is meshed with the gear ring (83).
4. A concrete allocation dedicated device according to claim 3, wherein the stop member assembly (9) comprises: the small disc (91) is connected to the water outlet pipe (73) in a sliding mode, a plurality of arc-shaped material blocking plates (92) are uniformly connected to the small disc (91) at intervals along the circumferential direction, and the arc-shaped material blocking plates (92) can block the blanking port (53); the wedge-shaped blocks (93) are arranged in a plurality of blocks, and the plurality of wedge-shaped blocks (93) are uniformly connected to the top of the small disc (91) at intervals along the circumferential direction; a spring (94) connected between the small disc (91) and the water storage tank (71); and the pushing rod (95) is connected to the bottom of the large disc (85), and the pushing rod (95) is matched with the wedge block (93).
5. A concrete deployment specific apparatus according to claim 4, further comprising an automatic valve assembly (10), the automatic valve assembly (10) comprising: the sliding sleeve (101) is connected to the lower part of the water outlet pipe (73) in a sliding manner, the sliding sleeve (101) is connected with a connecting rod (102), the connecting rod (102) is connected with a blocking block (103), and the blocking block (103) can block the water outlet end of the water outlet pipe (73); and the rotary disc (104) is connected to the water outlet pipe (73) in a rotary manner, a first connecting rod (105) is hinged between the rotary disc (104) and the small disc (91), and a second connecting rod (106) is hinged between the rotary disc (104) and the plugging block (103).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010846286.0A CN112025986A (en) | 2020-08-21 | 2020-08-21 | Concrete configuration professional equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010846286.0A CN112025986A (en) | 2020-08-21 | 2020-08-21 | Concrete configuration professional equipment |
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| Publication Number | Publication Date |
|---|---|
| CN112025986A true CN112025986A (en) | 2020-12-04 |
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| CN202010846286.0A Pending CN112025986A (en) | 2020-08-21 | 2020-08-21 | Concrete configuration professional equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113119308A (en) * | 2021-04-25 | 2021-07-16 | 王海强 | Corrosion-resistant concrete apparatus for producing that permeates water |
| CN116587431A (en) * | 2023-06-13 | 2023-08-15 | 浙江京创商品混凝土有限公司 | Machine-made sand natural sand mixing preparation high-strength concrete |
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| US20050201199A1 (en) * | 2001-10-05 | 2005-09-15 | Vervant Limited | Blenders |
| CN204094958U (en) * | 2014-09-24 | 2015-01-14 | 三一汽车制造有限公司 | A kind of proportioning machine and concrete mixing plant |
| CN109397535A (en) * | 2018-11-13 | 2019-03-01 | 开平市扬帆混凝土有限公司 | A kind of proportioning machine for concrete production |
| CN209076611U (en) * | 2018-10-24 | 2019-07-09 | 海城三岩矿业有限公司 | A kind of mineral production measurer |
| CN209937320U (en) * | 2018-12-27 | 2020-01-14 | 山东中建西部建设有限公司 | Automatic auxiliary material feeding device for ready-mixed concrete |
| CN110834378A (en) * | 2019-11-21 | 2020-02-25 | 湖州越威家具有限公司 | Blanking and water adding synchronous cement mortar processing device with better mixing effect |
| CN111331736A (en) * | 2020-04-09 | 2020-06-26 | 郑州三和水工机械有限公司 | Put top formula environment-friendly stirring building feed bin distribution structure |
-
2020
- 2020-08-21 CN CN202010846286.0A patent/CN112025986A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050201199A1 (en) * | 2001-10-05 | 2005-09-15 | Vervant Limited | Blenders |
| CN204094958U (en) * | 2014-09-24 | 2015-01-14 | 三一汽车制造有限公司 | A kind of proportioning machine and concrete mixing plant |
| CN209076611U (en) * | 2018-10-24 | 2019-07-09 | 海城三岩矿业有限公司 | A kind of mineral production measurer |
| CN109397535A (en) * | 2018-11-13 | 2019-03-01 | 开平市扬帆混凝土有限公司 | A kind of proportioning machine for concrete production |
| CN209937320U (en) * | 2018-12-27 | 2020-01-14 | 山东中建西部建设有限公司 | Automatic auxiliary material feeding device for ready-mixed concrete |
| CN110834378A (en) * | 2019-11-21 | 2020-02-25 | 湖州越威家具有限公司 | Blanking and water adding synchronous cement mortar processing device with better mixing effect |
| CN111331736A (en) * | 2020-04-09 | 2020-06-26 | 郑州三和水工机械有限公司 | Put top formula environment-friendly stirring building feed bin distribution structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113119308A (en) * | 2021-04-25 | 2021-07-16 | 王海强 | Corrosion-resistant concrete apparatus for producing that permeates water |
| CN116587431A (en) * | 2023-06-13 | 2023-08-15 | 浙江京创商品混凝土有限公司 | Machine-made sand natural sand mixing preparation high-strength concrete |
| CN116587431B (en) * | 2023-06-13 | 2024-01-26 | 浙江京创商品混凝土有限公司 | Machine-made sand natural sand mixing preparation high-strength concrete |
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Application publication date: 20201204 |
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