Apparatus for measuring moisture content of sand for manufacturing concrete

Abstract

The present invention aims to provide a moisture measuring device for sand used in concrete production, which can accurately measure the moisture content of sand for concrete production in advance and accurately adjust the mixing ratio of water during concrete production based on the measurement results of the sand moisture content, by installing a moisture measuring device capable of measuring the moisture contained in the sand so as to be vertically movable across the inside and outside of the sand weigher after making the cohesive density of the sand filled from a sand storage hopper to a constant level.

Description

Technology Field

[0001] The present invention relates to a moisture measuring device for sand used in concrete production, and more specifically, to a moisture measuring device for sand used in concrete production that accurately measures the moisture content of the sand mixed for concrete production in advance and accurately controls the mixing ratio of water during concrete production based on the measurement results. Background Technology

[0003] As is well known, concrete is a mixture of cement, aggregates such as sand and gravel, and water in specific proportions, and is used as a major material for civil engineering and construction.

[0004] When manufacturing the above concrete, hydration—a type of chemical reaction—occurs as a certain proportion of water is mixed with cement and sand, causing the concrete to set and harden; therefore, the mixing ratio of water must be accurately controlled during concrete production.

[0005] Figure 1 attached is a schematic diagram illustrating a conventional sand supply metering device for concrete manufacturing.

[0006] A conventional sand supply metering device for concrete manufacturing includes a sand storage hopper (10), a sand meter (20), and a mixer (30).

[0007] A sand meter (20) may be placed at the bottom of the sand storage hopper (10), and a concrete manufacturing mixer (30) may be placed at the bottom of the sand meter (20).

[0008] At this time, a first opening / closing device (12) and a second opening / closing device (22) for discharging or blocking sand may be installed at the lower part of the sand storage hopper (10) and the lower part of the sand meter (20), respectively.

[0009] First, the sand that was piled up in the storage yard is filled into the sand storage hopper (10).

[0010] Subsequently, when the first opening / closing device (12) mounted on the lower part of the sand storage hopper (10) is opened, sand can be filled from the sand storage hopper (10) into the sand meter (20).

[0011] Next, the amount of sand filled into the sand meter (20) is measured by a measuring device (not shown) mounted on the sand meter (20), and when a certain proportion of the amount of sand is measured, the first opening / closing device (12) of the sand storage hopper (10) is closed.

[0012] Next, when the second opening / closing device mounted on the lower part of the sand meter (20) is opened, sand measured at a certain ratio from the sand meter (20) can be supplied to the concrete manufacturing mixer (30).

[0013] Accordingly, concrete can be manufactured by adding cement and water in a certain ratio to the concrete manufacturing mixer (30) in addition to sand and mixing them.

[0014] At this time, the upper layer of the sand piled up in the storage yard has a low moisture content due to drying, but the lower layer of the sand has a high moisture content due to water seeping in during rain, so the sand filled into the sand storage hopper (10) may contain moisture.

[0015] If the sand containing moisture from the sand storage hopper (10) is filled into the concrete manufacturing mixer (30) through the sand meter (20), and cement and water are added to the concrete manufacturing mixer (30) in addition to the sand in a certain ratio, the moisture content contained in the sand is further mixed in addition to the water, thereby allowing for the production of defective concrete with a water content higher than the certain ratio.

[0016] Accordingly, it is desirable to measure the moisture content of the sand discharged from the sand storage hopper (10) to the concrete manufacturing mixer (30) through the sand meter (20), and to adjust the amount of water fed into the concrete manufacturing mixer based on the measured moisture content of the sand. Prior art literature

[0018] Registered Patent No. 10-1734953 (May 4, 2017) The problem to be solved

[0019] The present invention has been devised to solve the aforementioned conventional problems, and aims to provide a moisture measuring device for concrete manufacturing sand that can accurately measure the moisture content of the sand for concrete manufacturing in advance and accurately adjust the mixing ratio of water during concrete manufacturing based on the measurement results of the sand moisture content, by installing a moisture measuring device capable of measuring the moisture contained in the sand so as to be vertically movable across the inside and outside of the sand weigher after making the cohesive density of the sand filled from a sand storage hopper constant. means of solving the problem

[0021] To achieve the above-mentioned purpose, the present invention provides a moisture measuring device for concrete manufacturing sand, characterized by comprising: a sand storage hopper; a sand meter that measures the amount of sand discharged from the sand storage hopper and discharges the measured sand to a concrete manufacturing mixer; an air cylinder mounted on the outer side of the inlet of the sand meter; a horizontal rotating bar whose one end is hinged to the piston rod of the air cylinder by a first hinge pin, whose middle part is connected to a predetermined position at the inlet of the sand meter by a second hinge pin, and which performs a seesaw motion around the second hinge pin when the piston rod is raised or lowered; a lifting motion bar that is hinged to the other end of the horizontal rotating bar by a third hinge pin, is arranged vertically inside the sand meter, and moves up and down when the horizontal rotating bar performs a seesaw motion; and a moisture measuring sensor mounted on the lower end of the lifting motion bar, which measures the moisture contained in the sand while buried in the sand discharged from the sand storage hopper and filled in the sand meter.

[0022] In addition, the outer part of the inlet of the sand meter is characterized by having a fixing bracket mounted thereon to fix the air cylinder in a vertical position so that the piston rod is arranged to move up and down at the bottom of the air cylinder.

[0023] In addition, the sand meter is characterized by having a hinge bracket installed at a predetermined position at the inlet of the sand meter, such that the middle part of the horizontal rotating bar is connected by the second hinge pin.

[0024] In particular, the periphery of the lifting motion bar is characterized by being equipped with a guide bar that compacts and presses the sand filled in the sand weighing bar during the lifting motion of the lifting motion bar, in order to uniformly adjust the cohesive density of the sand filled in the sand weighing bar and maintain a constant measurement accuracy of the moisture measuring sensor.

[0025] Preferably, the moisture measuring device of the present invention is characterized by further including a computer that controls the display of the moisture content of the sand measured by the moisture measuring sensor on a display. Effects of the invention

[0027] Through the above-described means for solving the problem, the present invention provides the following effects.

[0028] First, by making the cohesive density of the sand constant and then measuring the moisture contained in the sand, the moisture content of the sand for concrete production can be accurately measured.

[0029] Second, based on the measurement results of the sand's moisture content, the mixing ratio of water during concrete manufacturing can be accurately controlled by adjusting the ratio relative to the sand's moisture content. Brief explanation of the drawing

[0031] FIG. 1 is a schematic diagram illustrating a sand supply metering device for conventional concrete manufacturing, FIG. 2 is a front view illustrating a moisture measuring device for sand for concrete manufacturing according to the present invention. FIG. 3 is a front view illustrating the operating state of a moisture measuring device for sand used in concrete manufacturing according to the present invention. Specific details for implementing the invention

[0032] The specific structural or functional descriptions described in the embodiments of this specification are merely illustrative for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms. Furthermore, the invention should not be interpreted as being limited by the embodiments described in this specification, and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention.

[0033] Meanwhile, in the present invention, terms such as "first" and / or "second" may be used to describe various components, but said components are not limited by said terms. For the sole purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0034] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components present in between. Conversely, when it is stated that one component is "directly connected" or "directly in contact" with another component, it should be understood that there are no other components present in between. Other expressions used to describe the relationship between components, such as "between" and "exactly between," or "adjacent to" and "directly adjacent to," should be interpreted in the same manner.

[0035] Throughout this specification, the same reference numerals denote the same components. The terms used in this specification are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used in this specification, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0036] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0037] Figure 2 attached is a front view illustrating a moisture measuring device for sand for concrete manufacturing according to the present invention, and Figure 3 is a front view illustrating the operating state of a moisture measuring device for sand for concrete manufacturing according to the present invention.

[0038] Referring to FIGS. 2 and 3, the moisture measuring device for sand for concrete manufacturing according to the present invention includes a sand storage hopper (10) and a sand meter (20), and can be configured to measure the moisture of sand filled from the sand storage hopper (10) to the sand meter (20).

[0039] A sand meter (20) is positioned at the bottom of the sand storage hopper (10), and a concrete manufacturing mixer (30) is positioned at the bottom of the sand meter (20). A first opening / closing device (12) and a second opening / closing device (22) for discharging or blocking sand may be installed at the bottom of the sand storage hopper (10) and the bottom of the sand meter (20), respectively.

[0040] In particular, an air cylinder (100) is mounted on the outer side of the inlet of the sand meter (20), and the piston rod (101) of the air cylinder (100) is mounted so as to face downward or upward depending on the installation conditions.

[0041] Preferably, a fixing bracket (102) is mounted on the outer side of the inlet of the sand meter (20) to fix the air cylinder (100) in a vertical arrangement so that the piston rod (101) is arranged to move up and down on the lower part of the air cylinder (100).

[0042] Accordingly, when the air cylinder (100) is fixed in a vertically arranged state by the fixed bracket (102), the piston rod (101) moves downward or upward when the air cylinder (100) is driven.

[0043] A horizontal rotating bar (110) is connected to the piston rod (101) of the above air cylinder (100), and the horizontal rotating bar (110) is connected to enable seesaw movement when the piston rod (101) is raised and lowered.

[0044] More specifically, one end of the horizontal rotating bar (110) is hinged to the piston rod (101) of the air cylinder (100) by the first hinge pin (111), the middle part is hinged to the second hinge pin (112) at a predetermined position of the inlet of the sand meter (20), and the other end is hinged to the lifting motion bar (120) by the third hinge pin (113), so that when the piston rod (101) is lifted, the horizontal rotating bar (110) moves in a seesaw motion around the second hinge pin (112).

[0045] Preferably, a hinge bracket (114) of a certain height is installed at a predetermined position of the entrance of the sand meter (20) such that the middle part of the horizontal rotating bar (110) is connected by a second hinge pin (112), thereby allowing the horizontal rotating bar (110) to easily perform a seesaw motion around the second hinge pin (112) at a position raised to a certain height from the predetermined position of the entrance of the sand meter (20).

[0046] The above lifting motion bar (120) is in the shape of a bar arranged vertically, and its upper end is hinged to the other end of the horizontal rotating bar (110) by the third hinge pin (113) and is arranged vertically inside the sand meter (20), so that it moves up and down in the up and down direction when the horizontal rotating bar (110) moves in a seesaw motion.

[0047] In particular, a moisture measuring sensor (130) is installed at the lower end of the lifting motion bar (120), and the moisture measuring sensor (130) measures the moisture contained in the sand while buried in the sand that is discharged from the sand storage hopper (10) and filled into the sand meter (20).

[0048] At this time, since the sand discharged from the sand storage hopper (10) and filled into the sand meter (20) is not in a compacted state, the sand aggregation density in some local areas surrounding the moisture measurement sensor (130) may be higher than a certain level, and the sand aggregation density in other local areas may be distributed lower than a certain level, so the accuracy of the moisture measurement sensor (130) in measuring the moisture content of the sand may decrease and become uneven.

[0049] Accordingly, it is desirable to compact the sand discharged from the sand storage hopper (10) and filled into the sand meter (20), that is, the sand surrounding the moisture measuring sensor (130), so that it exhibits a uniform cohesive density.

[0050] To this end, a rectangular frame-shaped guide bar (140) is installed on the periphery of the lifting motion bar (120) to move up and down together with the lifting motion bar (120) and to compact and press the sand filled in the sand meter (20).

[0051] Accordingly, the guide bar (140) acts as a frame that allows the lifting bar (120) to move only within a certain range during the lifting motion, and by scooping up the sand filled in the sand meter (20) and compacting it downward, the cohesive density of the sand filled in the sand meter (20) and surrounding the moisture measuring sensor (130) can be uniformly controlled overall, and accordingly, the measurement accuracy of the moisture measuring sensor (130) for measuring the moisture content of the sand can be maintained consistently.

[0052] Meanwhile, the moisture measuring device of the present invention may further include a computer (150) that controls the display of the moisture content of the sand measured by the moisture measuring sensor (130) on the display (151).

[0053] Accordingly, based on the measurement signal of the moisture measurement sensor (130), the computer (150) displays the moisture content of the sand on the display (151), thereby allowing the worker to easily recognize the moisture content of the sand for concrete manufacturing.

[0054] In addition, when a worker is aware of the moisture content of the sand for concrete production and mixes cement, sand, and water for concrete production, by reducing the mixing ratio of water by an amount equal to the moisture content of the sand, the cement, sand, and water can be accurately controlled and mixed at a preset mixing ratio.

[0055] Here, the operation flow of the moisture measuring device for concrete manufacturing sand composed of the above-described configuration is as follows.

[0056] First, the sand that was piled up in the storage yard is filled into the sand storage hopper (10).

[0057] Subsequently, when the first opening / closing device (12) mounted on the lower part of the sand storage hopper (10) is opened, sand can be filled from the sand storage hopper (10) into the sand meter (20).

[0058] Next, the amount of sand filled into the sand meter (20) is measured by a measuring device (not shown) mounted on the sand meter (20), and when a certain proportion of the amount of sand is measured, the first opening / closing device (12) of the sand storage hopper (10) is closed.

[0059] Next, as the piston rod (101) moves up and down in the up and down direction by driving the air cylinder (100), as shown in FIG. 3, the horizontal rotating bar (110) moves in a seesaw motion around the second hinge pin (112), and at the same time, the vertically arranged lifting bar (120) connected by the horizontal rotating bar (110) and the third hinge pin (113) moves up and down in the sand meter (20).

[0060] At this time, when the lifting motion bar (120) is in motion, the guide bar (140) mounted on the circumference of the lifting motion bar (120) acts as a frame that can move only within a certain range, and by scooping up the sand filled in the sand meter (20) and compacting and pressing it downward, the sand filled in the sand meter (20) can move downward and be pressurized as indicated by the arrow in Fig. 3, and the cohesive density of the sand surrounding the moisture measurement sensor (130) can be uniformly controlled overall.

[0061] Accordingly, when the cohesive density of the sand filled in the sand meter (20) is uniformly controlled overall, the moisture measuring sensor (130) surrounded by sand measures the moisture content of the sand, so the measurement accuracy of the moisture measuring sensor (130) can always be maintained at a constant level at every measurement.

[0062] At this time, based on the measurement signal of the moisture measurement sensor (130), the computer (150) displays the moisture content of the sand on the display (151), so that the worker can easily recognize the moisture content of the sand for concrete production. Therefore, when the worker mixes cement, sand, and water for concrete production, the mixing ratio of water is reduced by the amount of moisture content of the sand, so that the cement, sand, and water can be accurately adjusted and mixed at a preset mixing ratio, and accordingly, concrete of a consistent quality can be produced.

[0063] Although the present invention has been described in detail above as one embodiment, the scope of the present invention is not limited to the above-described embodiment, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also included within the scope of the present invention. Explanation of the symbols

[0065] 10: Sand storage hopper 12: First switching device 20: Sand meter 22: Second switching device 30: Mixer 100: Air cylinder 101: Piston rod 102: Fixing bracket 110: Horizontal rotation bar 111: 1st hinge pin 112: Second hinge pin 113: 3rd hinge pin 114: Hinge bracket 120: Lifting / Lowering Bar 130: Moisture measurement sensor 140: Guide bar 150: Computer 151: Display

Claims

Claim 1 A sand storage hopper (10); a sand meter (20) that measures the amount of sand discharged from the sand storage hopper (10) and discharges the measured sand to a concrete manufacturing mixer (30); an air cylinder (100) mounted on the outer side of the inlet of the sand meter (20); a horizontal rotating bar (110) whose one end is hinged to the piston rod (101) of the air cylinder (100) by a first hinge pin (111), and whose middle part is connected to a predetermined position at the inlet of the sand meter (20) by a second hinge pin (112), and which performs a seesaw motion around the second hinge pin (112) when the piston rod (101) is raised or lowered; a third hinge pin (113) that is hinged to the other end of the horizontal rotating bar (110) and is arranged vertically inside the sand meter (20), and which moves up and down when the horizontal rotating bar (110) performs a seesaw motion A moisture measuring device for concrete manufacturing sand, characterized by comprising: a lifting motion bar (120) that moves up and down; and a moisture measuring sensor (130) mounted on the lower end of the lifting motion bar (120) and buried in the sand discharged from the sand storage hopper (10) and filled into the sand meter (20). Claim 2 A moisture measuring device for sand for concrete production according to claim 1, characterized in that a fixing bracket (102) is mounted on the outer part of the inlet of the sand meter (20) to fix the air cylinder (100) in a vertical arrangement so that the piston rod (101) is arranged to move up and down on the lower part of the air cylinder (100). Claim 3 A moisture measuring device for sand for concrete manufacturing according to claim 1, characterized in that a hinge bracket (114) is mounted at a predetermined position of the inlet of the sand meter (20) such that the middle part of the horizontal rotating bar (110) is connected by the second hinge pin (112). Claim 4 A moisture measuring device for sand for concrete manufacturing according to claim 1, characterized in that a guide bar (140) is mounted on the circumference of the lifting and lowering bar (120) to compact and press the sand filled in the sand weigher (20) during the lifting and lowering movement of the lifting and lowering bar (120) in order to uniformly adjust the cohesive density of the sand filled in the sand weigher (20) and maintain a constant measurement accuracy of the moisture measuring sensor (130). Claim 5 A moisture measuring device for sand for concrete manufacturing according to claim 1, further comprising a computer (150) that controls the display of the moisture content of the sand measured by the moisture measuring sensor (130) on a display (151).

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