CN114384234A - Device and method for measuring fluidity and wet density of freshly-mixed foam concrete - Google Patents
Device and method for measuring fluidity and wet density of freshly-mixed foam concrete Download PDFInfo
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007790 scraping Methods 0.000 claims abstract description 19
- 210000000078 claw Anatomy 0.000 claims abstract description 16
- 239000004567 concrete Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 28
- 238000009434 installation Methods 0.000 claims description 3
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- 238000001514 detection method Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 3
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- 210000005056 cell body Anatomy 0.000 description 2
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Abstract
A device for measuring the fluidity and the wet density of freshly-mixed foam concrete comprises a first barrel, wherein a receiving hopper is arranged above the first barrel, a rotary scraping mechanism is arranged between the receiving hopper and the first barrel, the bottom of the first barrel is provided with an adjusting bottom plate, a second barrel is arranged below the adjusting bottom plate, a transparent fixing plate is arranged below the second barrel, the bottom surface of the transparent fixing plate is provided with a track, a sliding block is arranged in the track, and the transparent fixing plate is fixed on a bottom support; a hammering mechanism is further sleeved on the side wall of the first cylinder; the bottom support is fixed on an L-shaped bracket, a vertical cavity is arranged in a vertical section of the bracket, and the hammering mechanism is fixed on the vertical section of the bracket; the side wall of the first cylinder body is also fixedly provided with a lifting claw which transversely extends into the vertical cavity. The invention adopts the structure to solve the problems of non-standard concrete fluidity and wet density measuring method, complex operation and poor precision in the background technology.
Description
Technical Field
The invention relates to the field of concrete detection devices, in particular to a device and a method for measuring the fluidity and the wet density of freshly-mixed foam concrete.
Background
The application of the foam concrete in the construction field is an industrial hotspot, and the foam concrete accounts for more than half of the cast-in-place foam concrete due to large construction amount, lower comprehensive cost and continuous increase of application amount. At present, a plurality of production and construction units in China use a large amount of foam concrete in various projects, the foam concrete is used for road and bridge filling projects, civil buildings, novel heat-insulating materials and the like, and becomes the mainstream of industrial application, and a great amount of economic and social benefits are obtained. However, foam concrete compares with traditional concrete, each side performance difference is very big, newly stir foam concrete and to keeping warm, performance such as fire prevention has certain requirement, at present in the construction pouring process, the construction operation is extensive, on detecting newly stir foam concrete mobility and wet density performance index, traditional measurement mode sample is not standard, complex operation etc. the measuring result error that leads to is big, seriously influence the subsequent engineering application of newly stir foam concrete, how to solve high-efficient accurate quick measurement foam concrete mobility and wet density on traditional technology or device, be a technical problem who awaits the solution urgently.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for measuring the fluidity and the wet density of freshly-mixed foam concrete, which are used for solving the problems of non-standard concrete fluidity and wet density measuring methods, complex operation and poor precision in the background technology.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a device for measuring the fluidity and the wet density of freshly-mixed foam concrete comprises a first barrel, wherein a receiving hopper is arranged above the first barrel, a rotary scraping mechanism is arranged between the receiving hopper and the first barrel, the bottom of the first barrel is provided with an adjusting bottom plate, a second barrel is arranged below the adjusting bottom plate, a transparent fixed plate is arranged below the second barrel, the bottom surface of the transparent fixed plate is provided with a track, a sliding block is arranged in the track, and the transparent fixed plate is fixed on a bottom support;
a hammering mechanism is further sleeved on the side wall of the first cylinder;
the bottom support is fixed on an L-shaped bracket, a vertical cavity is arranged in a vertical section of the bracket, and the hammering mechanism is fixed on the vertical section of the bracket;
the side wall of the first cylinder body is further fixedly provided with a lifting claw, the lifting claw is L-shaped, the lifting claw transversely extends into the vertical cavity, a rack is arranged on a vertical section of the lifting claw positioned in the vertical cavity, a first gear meshed with the rack is arranged in the vertical cavity, and the first gear is driven by a motor.
In the preferred scheme, a material collecting groove is arranged on the side wall of the first cylinder, and the top surface of the material collecting groove is flush with the top surface of the first cylinder;
the material collecting groove consists of two semicircular groove bodies, a connecting groove and a connecting column are arranged on the end face of the material collecting groove, and the two semicircular groove bodies are spliced into a whole through the connecting groove and the connecting column in an occluded mode.
In the preferred scheme, connect and be equipped with the motor support in the hopper, be equipped with first motor on the motor support, the first motor axle downwardly extending of first motor extends to and connects hopper bottom opening part and is connected fixedly with rotatory scraper mechanism.
In a preferable scheme, the rotary scraping mechanism is a cross-shaped rod member consisting of two rods, and the rotary scraping mechanism is arranged in a gap between the first cylinder and the receiving hopper.
In the preferred scheme, a limit ring plate is arranged on the side wall of the first cylinder, and the material collecting groove is detachably arranged on the limit ring plate.
In a preferred scheme, the hammering mechanism consists of a cylindrical part and a rectangular body part, wherein a first cavity is arranged in the cylindrical part, and a second cavity is arranged in the rectangular body part;
the first cylinder penetrates through the cylindrical part, a rotary toothed ring is arranged in the first cavity, a second motor is arranged in the second cavity, a second gear is arranged on the second motor, and the second gear penetrates through a hole formed in a partition plate between the cylindrical part and the rectangular body and is meshed with teeth on the outer wall of the rotary toothed ring;
a through hole for the first cylinder to pass through is formed in the middle of the rotary toothed ring, ratchets are arranged on the inner wall of the through hole, a plurality of hammering rods are uniformly distributed on the inner wall of the first chamber, the upper ends of the hammering rods extend into the through hole and are in contact with the ratchets, and rubber hammers are arranged at the lower ends of the hammering rods;
the periphery of the bottom surface of the rotating gear ring is provided with a limiting ring, and the limiting ring is matched with an installation groove extending outwards from the top of the first cavity.
In the preferred scheme, the inner wall of the first cavity is provided with a hinged seat, the hammering rod is arranged on the hinged seat through a hinged pin shaft, the hinged point is positioned in the middle of the hammering rod, and a torsion spring is arranged between the hinged seat and the hammering rod.
In the preferred scheme, a blanking hole for blanking is formed in the adjusting bottom plate, and the aperture of the blanking hole is the same as and aligned with the inner diameter of the second cylinder below the adjusting bottom plate;
blanking hole top be equipped with two striker plates, two striker plates set up on adjusting the bottom plate through the articulated shaft respectively, are equipped with the bar groove on adjusting the bottom plate between the articulated shaft of two striker plates, the bar inslot is equipped with the push rod, outside push rod one end extended to adjusting the bottom plate, be equipped with the kicking block on the other end, kicking block and striker plate contact.
The method for measuring the fluidity and the wet density of the freshly mixed foam concrete based on the measuring device comprises the following steps:
1) adding fresh foam concrete into the first cylinder through a receiving hopper;
2) starting a first motor, and driving a rotary scraping mechanism to scrape redundant foam concrete on the top surface of the first cylinder;
3) starting a driving mechanism of the first gear and a second motor, driving the first cylinder to move up and down through the lifting claw, and enabling the ratchets to be matched with the hammering rod through the second motor to realize continuous hammering of the rubber hammer on the first cylinder;
4) recording the foam concrete mass M in this state after completion of hammering1；
5) Repeating the steps 1) to 4) until the foam concrete in the first cylinder is filled, and recording the quality M of the foam concrete in the state2；
6) Pushing the push rod to enable the ejector block to jack the striker plate, and enabling the foam concrete to fall into the second cylinder;
7) the push rod is pulled back to reset the striker plate;
8) starting a driving mechanism of the first gear to enable the first cylinder to drive the second cylinder to ascend integrally, so that the foam concrete collapses freely;
9) and after standing for 1min, moving the slide block to the edge of the collapsed foam concrete by adjusting the position of the slide block in the track, and recording collapse data.
In the preferred scheme, the ejector block arranged at the end part of the push rod adopts a magnet, and the striker plate is driven to reset through magnetic attraction when the push rod is pulled back.
The device and the method for measuring the fluidity and the wet density of the freshly mixed foam concrete have the following beneficial effects by adopting the structure and the method:
(1) the method simplifies the operation steps of measuring the fluidity and the wet density of the freshly mixed foam concrete, reduces the interference of human factors, and ensures the precision of detection data on the basis of reducing the complexity of operation;
(2) the device is adopted to carry out semi-automatic measurement on the fluidity and the wet density of the freshly mixed foam concrete, and the intellectualization of concrete performance detection operation is realized by matching with an automatic hammering and scraping mechanism.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic diagram of the explosive structure of the present invention.
Fig. 3 is a schematic structural diagram of the hammer mechanism of the present invention.
Fig. 4-5 are schematic structural views of the rubber hammer of the present invention in different states.
Fig. 6 is a schematic view of the overall structure of the rotary ring gear of the present invention.
Fig. 7 is a schematic view of a half-section structure of the rotary ring gear of the present invention.
Fig. 8 is a schematic structural view of an adjusting bottom plate of the striker plate in a closed state.
Fig. 9 is a schematic structural view of an adjusting bottom plate of the striker plate in an unfolded state.
In the figure: the material collecting device comprises a first barrel 1, a limit ring plate 101, a material receiving hopper 2, a rotary scraping mechanism 3, a material collecting groove 4, a connecting groove 401, a connecting column 402, a hammering mechanism 5, a first chamber 501, a second chamber 502, a lifting claw 6, a rack 7, a support 8, a vertical cavity 801, a first gear 9, an adjusting bottom plate 10, a blanking hole 1001, a strip-shaped groove 1002, a second barrel 11, a transparent fixing plate 12, a track 13, a sliding block 14, a bottom support 15, a motor support 16, a first motor 17, a first motor shaft 171, a rotary gear ring 18, a through hole 181, a ratchet 182, a limit ring 183, a hammering rod 19, a rubber hammer 191, a hinged seat 20, a hinged pin shaft 21, a torsion spring 22, a second motor 23, a second gear 24, a material blocking plate 25, a hinged shaft 251, a push rod 26 and a top block 261.
Detailed Description
Example 1:
a measuring device for fluidity and wet density of freshly-mixed foam concrete comprises a first barrel body 1, wherein a receiving hopper 2 is arranged above the first barrel body 1, a rotary scraping mechanism 3 is arranged between the receiving hopper 2 and the first barrel body 1, an adjusting bottom plate 10 is arranged at the bottom of the first barrel body 1, a second barrel body 11 is arranged below the adjusting bottom plate 10, a transparent fixing plate 12 is arranged below the second barrel body 11, a track 13 is arranged on the bottom surface of the transparent fixing plate 12, a slide block 14 is arranged in the track 13, and the transparent fixing plate 12 is fixed on a bottom support 15;
the side wall of the first cylinder 1 is also sleeved with a hammering mechanism 5;
the bottom support 15 is fixed on the L-shaped support 8, a vertical cavity 801 is arranged in a vertical section of the support 8, and the hammering mechanism 5 is fixed on the vertical section of the support 8;
the side wall of the first barrel body 1 is further fixed with a lifting claw 6, the lifting claw 6 is L-shaped, the lifting claw 6 transversely extends into the vertical cavity 801, a rack 7 is arranged on a vertical section of the lifting claw 6 located in the vertical cavity 801, a first gear 9 meshed with the rack 7 is arranged in the vertical cavity 801, and the first gear 9 is driven by a motor.
In the preferred scheme, a material collecting groove 4 is arranged on the side wall of the first cylinder 1, and the top surface of the material collecting groove 4 is flush with the top surface of the first cylinder 1;
the trough 4 that gathers materials constitute by two semicircle cell bodies, be equipped with spread groove 401 and spliced pole 402 on the terminal surface of trough 4 that gathers materials, form wholly through spread groove 401 and spliced pole 402 interlock concatenation between two semicircle cell bodies.
In a preferable scheme, a motor support 16 is arranged in the material receiving hopper 2, a first motor 17 is arranged on the motor support 16, and a first motor shaft 171 of the first motor 17 extends downwards to an opening at the bottom of the material receiving hopper 2 and is fixedly connected with the rotary scraping mechanism 3.
In a preferred scheme, the rotary scraping mechanism 3 is a cross-shaped rod member consisting of two rods, and the rotary scraping mechanism 3 is arranged in a gap between the first cylinder 1 and the receiving hopper 2.
In a preferred scheme, a limit ring plate 101 is arranged on the side wall of the first cylinder 1, and the material collecting groove 4 is detachably arranged on the limit ring plate 101.
In a preferred scheme, the hammering mechanism 5 is composed of a cylindrical part and a rectangular body part, wherein a first cavity 501 is arranged in the cylindrical part, and a second cavity 502 is arranged in the rectangular body part;
the first cylinder 1 penetrates through the cylindrical part, the rotary toothed ring 18 is arranged in the first cavity 501, the second motor 23 is arranged in the second cavity 502, the second motor 23 is provided with a second gear 24, and the second gear 24 penetrates through a hole formed in a partition plate between the cylindrical part and the rectangular body and is meshed with teeth on the outer wall of the rotary toothed ring 18;
a through hole 181 for the first cylinder 1 to pass through is formed in the middle of the rotary toothed ring 18, ratchets 182 are formed on the inner wall of the through hole 181, a plurality of hammering rods 19 are uniformly distributed on the inner wall of the first chamber 501, the upper ends of the hammering rods 19 extend into the through hole 181 and are in contact with the ratchets 182, and rubber hammers 191 are arranged at the lower ends of the hammering rods 19;
the periphery of the bottom surface of the rotating gear ring 18 is provided with a limiting ring 183, and the limiting ring 183 is matched with an installation groove extending outwards from the top of the first chamber 501.
In a preferred scheme, the inner wall of the first chamber 501 is provided with a hinged seat 20, the hammering rod 19 is arranged on the hinged seat 20 through a hinged pin 21, the hinged point is located in the middle of the hammering rod 19, and a torsion spring 22 is arranged between the hinged seat 20 and the hammering rod 19.
In a preferred scheme, a blanking hole 1001 for blanking is arranged on the adjusting bottom plate 10, and the aperture of the blanking hole 1001 is the same as and aligned with the inner diameter of the second cylinder 11 below the adjusting bottom plate 10;
unloading hole 1001 top be equipped with two striker plates 25, two striker plates 25 set up on adjusting plate 10 through articulated shaft 251 respectively, be equipped with a bar groove 1002 on adjusting plate 10 between articulated shaft 251 of two striker plates 25, be equipped with push rod 26 in the bar groove 1002, outside push rod 26 one end extended to adjusting plate 10, be equipped with kicking block 261 on the other end, kicking block 261 and striker plate 25 contact.
In this example:
the inner diameter of the first cylinder 1 is set as 108mm +/-2 mm, the clear height is 108mm +/-2 mm, and the volume V of the first cylinder 1 is controlled to be constant 0.1m3；
The length of a scraper of the rotary scraping mechanism 3 is 120mm, and the scraper with the diameter larger than that of the first cylinder 1 ensures that the excessive concrete is scraped completely;
the inner diameter of the material collecting groove 4 is larger than the outer diameter of the first cylinder body 1 by 2-3 cm, and the material collecting groove is used for collecting scraped redundant concrete and facilitating centralized processing after detection operation is completed.
Example 2:
the method for measuring wet density of fresh foam concrete based on the measuring device in the embodiment 1 comprises the following steps:
1) adding fresh foam concrete into the first cylinder 1 through a receiving hopper 2;
2) starting the first motor 17 to drive the rotary scraping mechanism 3 to scrape off the redundant foam concrete on the top surface of the first cylinder 1;
3) starting a driving mechanism of the first gear 9 and the second motor 23, driving the first cylinder 1 to move up and down through the lifting pawl 6, and enabling the ratchet teeth 182 to be matched with the hammering rod 19 through the second motor 23 to realize continuous hammering of the first cylinder 1 by the rubber hammer 191;
4) recording the foam concrete mass M in this state after completion of hammering1；
5) Repeating the steps1-4 until the foam concrete in the first cylinder 1 is filled, and recording the foam concrete quality M in that state2。
In this example, the obtained data M are detected1And M2By substituting the formula:
wherein V is the volume of the first cylinder 1 and is constant 0.1m3。
In this example, a gravity sensor can be optionally designed on the transparent fixed plate 12 for realizing M1And M2Automated measurement of (3).
Example 3:
the fluidity of the foam concrete was measured in the following manner based on example 2:
1) pushing the push rod 26 to enable the top block 261 to push the striker plate 25, enabling the foam concrete to fall into the second cylinder 11, and waiting for at least 10 seconds, so that the concrete does not fall any more;
2) the push rod 26 is pulled back to reset the striker plate 25;
3) starting a driving mechanism of the first gear 9 to enable the first cylinder 1 to drive the second cylinder 11 to ascend integrally, wherein the ascending speed is controlled to be 10mm/s, and the ascending height is 80mm (larger than the integral height of the second cylinder 11), so that the foam concrete can freely collapse;
4) after standing for 1min, the slide block 14 is moved to the edge of the collapsed foam concrete by adjusting the position of the slide block 14 in the track 13, and collapse data a is recorded1And b1，a1And b1The distance between two sliders 14 in two mutually perpendicular tracks 13.
By applying the above obtained data a1And b1By substituting into formulas
L＝(a1+b1) And/2, obtaining concrete fluidity data.
In the preferred scheme, the top block 261 arranged at the end of the push rod 26 is a magnet, and the baffle plate 25 is driven to reset through magnetic attraction when the push rod 26 is pulled back.
In the above embodiment, the sliders 14 may be provided with light sensors for realizing the automatic movement of the sliders 14, and the two sliders 14 in the same track 13 are provided with infrared distance measuring sensors for realizing the data a1And b1Automated measurement of (3).
Claims (10)
1. A device for measuring the fluidity and the wet density of freshly mixed foam concrete is characterized in that: the material scraping device comprises a first barrel body (1), wherein a material receiving hopper (2) is arranged above the first barrel body (1), a rotary material scraping mechanism (3) is arranged between the material receiving hopper (2) and the first barrel body (1), an adjusting bottom plate (10) is arranged at the bottom of the first barrel body (1), a second barrel body (11) is arranged below the adjusting bottom plate (10), a transparent fixing plate (12) is arranged below the second barrel body (11), a track (13) is arranged on the bottom surface of the transparent fixing plate (12), a sliding block (14) is arranged in the track (13), and the transparent fixing plate (12) is fixed on a bottom support (15);
the side wall of the first cylinder (1) is also sleeved with a hammering mechanism (5);
the bottom support (15) is fixed on the L-shaped support (8), a vertical cavity (801) is arranged in the vertical section of the support (8), and the hammering mechanism (5) is fixed on the vertical section of the support (8);
the side wall of the first barrel body (1) is further fixed with a lifting claw (6), the lifting claw (6) is L-shaped, the lifting claw (6) transversely extends into the vertical cavity (801), a rack (7) is arranged on a vertical section of the lifting claw (6) located in the vertical cavity (801), a first gear (9) meshed with the rack (7) is arranged in the vertical cavity (801), and the first gear (9) is driven by a motor.
2. The apparatus for measuring fluidity and wet density of freshly mixed foam concrete according to claim 1, wherein: a material collecting groove (4) is arranged on the side wall of the first cylinder (1), and the top surface of the material collecting groove (4) is flush with the top surface of the first cylinder (1);
the material collecting groove (4) is composed of two semicircular groove bodies, a connecting groove (401) and a connecting column (402) are arranged on the end face of the material collecting groove (4), and the two semicircular groove bodies are meshed and spliced through the connecting groove (401) and the connecting column (402) to form a whole.
3. The apparatus for measuring fluidity and wet density of freshly mixed foam concrete according to claim 1, wherein: connect hopper (2) in be equipped with motor support (16), be equipped with first motor (17) on motor support (16), first motor shaft (171) downwardly extending of first motor (17) connect hopper (2) bottom opening part and with rotatory scraping mechanism (3) be connected fixedly.
4. The apparatus for measuring fluidity and wet density of freshly mixed foam concrete according to claim 3, wherein: the rotary scraping mechanism (3) is a cross-shaped rod piece consisting of two rods, and the rotary scraping mechanism (3) is arranged in a gap between the first cylinder (1) and the material receiving hopper (2).
5. The apparatus for measuring fluidity and wet density of fresh foam concrete according to claim 2, wherein: the side wall of the first cylinder body (1) is provided with a limiting ring plate (101), and the material collecting groove (4) is detachably arranged on the limiting ring plate (101).
6. The apparatus for measuring fluidity and wet density of freshly mixed foam concrete according to claim 1, wherein: the hammering mechanism (5) consists of a cylindrical part and a rectangular body part, wherein a first cavity (501) is arranged in the cylindrical part, and a second cavity (502) is arranged in the rectangular body part;
the first cylinder (1) penetrates through the cylindrical part, a rotary toothed ring (18) is arranged in the first cavity (501), a second motor (23) is arranged in the second cavity (502), a second gear (24) is arranged on the second motor (23), and the second gear (24) penetrates through a hole formed in a partition plate between the cylindrical part and the rectangular body and is meshed with teeth on the outer wall of the rotary toothed ring (18);
a through hole (181) for the first cylinder (1) to pass through is formed in the middle of the rotary toothed ring (18), ratchets (182) are arranged on the inner wall of the through hole (181), a plurality of hammering rods (19) are uniformly distributed on the inner wall of the first chamber (501), the upper ends of the hammering rods (19) extend into the through hole (181) and are in contact with the ratchets (182), and rubber hammers (191) are arranged at the lower ends of the hammering rods (19);
the periphery of the bottom surface of the rotary gear ring (18) is provided with a limiting ring (183), and the limiting ring (183) is matched with an installation groove extending outwards from the top of the first cavity (501).
7. The apparatus for measuring fluidity and wet density of fresh foam concrete according to claim 6, wherein: first cavity (501) inner wall on be equipped with articulated seat (20), hammering pole (19) set up on articulated seat (20) through articulated round pin axle (21), the pin joint is located hammering pole (19) middle part, be equipped with torsion spring (22) between articulated seat (20) and hammering pole (19).
8. The apparatus for measuring fluidity and wet density of freshly mixed foam concrete according to claim 1, wherein: a blanking hole (1001) for blanking is formed in the adjusting bottom plate (10), and the aperture of the blanking hole (1001) is the same as and aligned with the inner diameter of the second cylinder (11) below the adjusting bottom plate (10);
blanking hole (1001) top be equipped with two striker plates (25), two striker plates (25) set up on adjusting bottom plate (10) through articulated shaft (251) respectively, be equipped with one bar groove (1002) on adjusting bottom plate (10) between articulated shaft (251) of two striker plates (25), be equipped with push rod (26) in bar groove (1002), push rod (26) one end extends to outside adjusting bottom plate (10), is equipped with kicking block (261) on the other end, kicking block (261) and striker plate (25) contact.
9. The method for measuring the fluidity and wet density of fresh foam concrete according to any one of claims 1 to 8, comprising the steps of:
1) adding fresh foam concrete into the first cylinder (1) through the receiving hopper (2);
2) starting a first motor (17) to drive a rotary scraping mechanism (3) to scrape redundant foam concrete on the top surface of the first cylinder (1);
3) starting a driving mechanism of the first gear (9) and the second motor (23), driving the first cylinder (1) to move up and down through the lifting claw (6) and enabling the ratchet (182) to be matched with the hammering rod (19) through the second motor (23) to realize continuous hammering of the first cylinder (1) by the rubber hammer (191);
4) recording the foam concrete mass M in this state after completion of hammering1；
5) Repeating the steps 1) to 4) until the foam concrete in the first cylinder body (1) is filled, and recording the quality M of the foam concrete in the state2；
6) Pushing the push rod (26) to enable the ejector block (261) to jack the striker plate (25), and enabling the foam concrete to fall into the second cylinder (11);
7) the push rod (26) is pulled back to reset the striker plate (25);
8) starting a driving mechanism of the first gear (9) to enable the first cylinder (1) to drive the second cylinder (11) to integrally ascend, so that the foam concrete freely collapses;
9) and after the concrete is static for 1min, the slide block (14) is moved to the edge of the collapsed foam concrete by adjusting the position of the slide block (14) in the track (13), and the collapse data is recorded.
10. The method of claim 9, wherein the method comprises the steps of: the ejector block (261) arranged at the end part of the push rod (26) adopts a magnet, and the baffle plate (25) is driven to reset through magnetic attraction when the push rod (26) is pulled back.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111645185.8A CN114384234A (en) | 2021-12-29 | 2021-12-29 | Device and method for measuring fluidity and wet density of freshly-mixed foam concrete |
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| CN202111645185.8A CN114384234A (en) | 2021-12-29 | 2021-12-29 | Device and method for measuring fluidity and wet density of freshly-mixed foam concrete |
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