Testing device and testing method for testing silt content of aggregate

Abstract

The invention provides a testing device and method for testing the silt content of aggregate. The device is composed of an inner screen drum with holes, a power system, an outer drum body, a control system and a data collecting and printing system. The power system is composed of a motor, an impeller, a belt, a protection support and a clutch. The control system is composed of a power supply mode, a washing mode and a drying and dewatering mode. The perforated inner screen drum and the power system are located in the outer drum body, and the control system is located on the outer side edge of the outer drum body. According to the test device, errors caused by incomplete washing of particles with the particle content below 0.075 mm can be reduced, meanwhile, material washing is convenient and rapid, the test data accuracy and analysis timeliness are improved, and full-automatic and multifunctional data acquisition service is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mud content determination, and in particular to a test device and a test method for testing the mud content of aggregates. Background Art

[0002] Mud content refers to the content of dust, silt and clay with a particle size of less than 0.075mm in the aggregate. Its presence will have a negative impact on the performance of asphalt mixture. Mud is usually hydrophilic and will reduce the adhesion between asphalt and aggregate. When the adhesion decreases, the water stability of the asphalt mixture will deteriorate and it will easily peel off in the presence of water, affecting its durability. Aggregates with too high mud content may make the asphalt mixture difficult to compact. Insufficient compaction will affect the density and porosity of the mixture, thereby affecting its mechanical properties and service life. In addition, excessive mud content will directly affect the high temperature stability and water stability of the asphalt mixture. Therefore, conducting mud content tests before using aggregates is a key link in road construction quality control.

[0003] According to the relevant aggregate test procedures, the test steps for mud content in road aggregates are as follows: according to the requirements of the specification, weigh the mass corresponding to the corresponding aggregate specifications, put the prepared sample into a container and add enough water to stir so that fine particles such as mud are fully dispersed; then let it stand for a period of time to allow the mud particles to settle; after the sedimentation is completed, filter the supernatant with a sieve, and rinse it repeatedly with clean water until the washed water is clear; put the cleaned sample into an oven, dry it, and weigh it. The mud content is calculated based on the mass of the original sample and the mass of the dried sample.

[0004] Although the traditional mud content test method is widely used, it also has some limitations. The traditional method usually requires more manual operations, such as sampling, crushing, stirring, settling, filtering, washing and drying, etc. These steps are easily affected by the operator's skills and experience, resulting in inconsistent results; the entire test process is time-consuming, especially the sedimentation and drying steps, which require a long waiting time and are not suitable for rapid testing and large-scale testing; during the filtering and washing process, fine particles may be lost, affecting the accuracy of the test results. In addition, if the soil particles in the sample are coarse, they may not be completely filtered, resulting in an underestimated mud content.

[0005] At present, there are many aggregate mud content determination devices in the prior art. For example, a Chinese patent application with a publication number of CN219830697U discloses an aggregate mud content determination and cleaning device. A centrifugal inner cylinder, a water injection pipe, a sewage pipe, an upper and lower screen and other structures are set in the test box to realize the automatic soaking and washing of the aggregate, reduce the labor and labor intensity, improve the cleaning efficiency, save the measurement time, and avoid the problem of easy loss of samples caused by manual washing. However, the device has a complex structure and high cost; the device cannot realize the automatic measurement of mud content, and the sample after sieving and washing needs to be taken out and dried and weighed, and multiple transfers are prone to loss, affecting the accuracy of the measurement. A Chinese patent application with a publication number of CN221311009U discloses a spiral sand washing machine. By setting a cleaning tank, a transmission auger, a blocking plate and other structures, the cleaning time of sand and gravel in the cleaning tank is increased, thereby improving the cleaning quality. However, the device lacks a filtering device and can only use manual identification to identify whether the sand and gravel are clean. Due to different judgment criteria for each person, the degree of cleanliness of the sand and gravel will vary greatly. In a Chinese patent with announcement number CN 221078365 U, a device for testing the mud content of sea sand is disclosed, comprising a placing plate, a desilting bucket is fixedly installed on the upper end of the placing plate, a feed pipe is fixedly installed on the upper end of the desilting bucket, a water inlet pipe is fixedly installed on one side of the upper end of the desilting bucket, the feed pipe is located on one side of the water inlet pipe, a water outlet pipe is fixedly installed on the lower end of the desilting bucket, weighing sensors are fixedly installed at the four corners of the lower end of the placing plate, a supporting plate is fixedly installed at the lower end of the weighing sensor, the lower end of the water outlet pipe is located at the lower end of the supporting plate, and the water outlet pipe is not in contact with the supporting plate. By placing sea sand in the desilting bucket, the weighing sensor weighs the overall weight, and then the mud in the sea sand is removed by the desilting bucket, leaving only the remaining sea sand in the desilting bucket, and the weight is weighed again by the weighing sensor, and the mud content in the sea sand is calculated by the difference in weight twice. This detection method does not require a container conversion, thereby improving the accuracy of mud content detection. However, in the mud removal process of this patent, the mud removal barrel is stationary, and mud is removed only by flushing with water flow. The stirring of the stirring brush is only to complete the removal of mud in the sea sand and ensure the cleanliness of the mud removal. Therefore, the overall mud removal efficiency is low. Summary of the invention

[0006] The object of the present invention is to provide a mud content testing device and a testing method in the field of roadbed and pavement engineering, which can improve the quickness of aggregate washing, ensure the washing efficiency, and reduce the workload of test personnel and test errors.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides a test device for testing the mud content of aggregates, which comprises an outer cylinder, an inner screen cylinder with holes, and a control system;

[0009] A liquid inlet pipe is arranged at the top of the outer cylinder, a liquid discharge pipe is arranged at the bottom, and a slide rail and a vertical driving device are arranged on the inner wall of the outer cylinder. A slider is arranged on the slide rail, and the slider is driven by the vertical driving device to move up and down;

[0010] The perforated inner sieve cylinder is arranged in the outer cylinder, and the perforated inner sieve cylinder is connected to the slider on the slide rail through a plurality of retractable connecting rods;

[0011] A weighing device is also provided at the bottom of the outer cylinder;

[0012] A drying device for drying sand and gravel aggregate is arranged on the inner wall of the outer cylinder;

[0013] The control system controls the vertical drive device to achieve the up and down movement of the perforated inner sieve drum, thereby achieving the separation or contact between the perforated inner sieve drum and the weighing device; the control system controls the extension and contraction of the connecting rod to achieve the shaking of the perforated inner sieve drum; the control system controls the drying device to achieve the drying of the aggregate.

[0014] By adopting the above technical solution, the sliding connecting rod is driven by the power system to extend and retract to realize the shaking of the perforated inner screen drum, so that the sand and gravel aggregates roll in the perforated inner screen drum, which effectively avoids the damage to the sand and gravel aggregates and ensures the sufficient washing of the sand and gravel, improves the screening and washing effect, and reduces the problem of mechanical mixing damaging the aggregates.

[0015] As a further technical solution, the drying device includes a blower, a heater and an air supply port, wherein the heater and the air supply port are arranged on the inner wall of the outer cylinder, and the blower supplies air to the air supply port.

[0016] As a further technical solution, the heater is an electric heating wire, and the electric heating wire is spirally wound and arranged inside the cylinder wall of the outer cylinder.

[0017] As a further technical solution, the air outlet is a multi-hole hinge type, the air outlet is arranged in multiple areas on the inner wall of the outer cylinder, and the air outlet can be controlled to open and close by a control system;

[0018] As a further technical solution, a barrel cover is provided on the top of the outer cylinder, a water injection port is provided on the inner wall of the outer cylinder, the water injection port is located at the upper part of the inner sieve cylinder with holes, the water injection port is externally connected to a liquid inlet pipe, water is injected into the inner sieve cylinder with holes through the liquid inlet pipe, and a liquid inlet solenoid valve is provided on the liquid inlet pipe;

[0019] As a further technical solution, the bottom of the inner wall of the outer cylinder is inclined, and a drain pipe is provided at the lowest point of the inclined bottom, through which the sewage in the perforated inner sieve cylinder is discharged, and a turbidity meter is provided in the drain pipe;

[0020] As a further technical solution, a liquid level gauge is provided in the perforated inner sieve cylinder;

[0021] As a further technical solution, the perforated inner sieve cylinder has sieve holes of 0.075 mm all around;

[0022] By adopting the above technical solution, when the solenoid valve is turned on, the air supply port is closed, and the water injection port starts to inject water into the perforated inner sieve drum. When the limit value of the liquid level gauge is reached, the connecting rod quickly retracts back and forth, and the perforated inner sieve drum starts to shake. Dust, silt and clay with a particle size of less than 0.075 mm in the aggregate are separated from the aggregate through the sieve holes around the perforated inner sieve drum along with the water, and slide out of the discharge pipe through the inclined bottom of the outer cylinder; when the discharged sewage reaches the preset standard of the turbidity meter, the perforated inner sieve drum stops shaking, the liquid inlet solenoid valve is closed, the water injection is stopped, the heater and the blower are turned on, the air supply port hinge is opened, and the sand and gravel are started to be dried; automatic water injection and drying are realized through the control logic between the controller, the liquid level gauge, the turbidity meter, the liquid inlet solenoid valve, the heater, the blower and the air supply port;

[0023] As a further technical solution, a weighing device is provided inside the outer cylinder, the weighing device is located below the inner screen cylinder with holes, and the weighing device is connected to a data acquisition printer;

[0024] As a further technical solution, the data acquisition printer is detachably and independently arranged outside the outer cylinder, and the data acquisition printer is used for data collection, processing and printing;

[0025] In a second aspect, the present invention further provides a test method based on the above-mentioned test device for testing mud content, which is specifically as follows;

[0026] Pour the specified mass of road aggregate sample into the perforated inner sieve drum, and weigh the mass m0 with the weighing device;

[0027] Start the control system, and the connecting rod moves the perforated inner screen drum along the slide rail to the highest point, so that the perforated inner screen drum is separated from the weighing device;

[0028] Then the liquid inlet pipe starts to inject water into the perforated inner sieve drum. When the liquid level reaches the preset value, the power system drives the connecting rod to quickly extend and retract back and forth, thereby driving the perforated inner sieve drum to shake. During this period, the liquid inlet pipe continues to inject water to keep the water level in the perforated inner sieve drum basically unchanged. When the turbidity meter in the discharge pipe reaches the preset value, the power system stops.

[0029] The perforated inner sieve drum stops shaking, and the liquid inlet pipe stops injecting water. At this time, the drying device starts to dry the remaining wet material in the perforated inner sieve drum;

[0030] After drying, the connecting rod moves the perforated inner screen drum along the slide rail to the lowest point, so that the perforated inner screen drum contacts the weighing device; the remaining mass m1 is read;

[0031] Calculate the mud content of aggregate.

[0032] The beneficial effects of the present invention are as follows:

[0033] The present invention adopts the above technical scheme to achieve that when feeding, the connecting rod is at the lowest point of the slide rail, the inner screen drum with holes is in contact with the weighing device, and the mass reading of the aggregate before screening and washing can be read; when water is injected, the connecting rod of the inner screen drum with holes moves upward to the highest point along the slide rail, the inner screen drum with holes is separated from the weighing device, and after it is in a suspended state, water is injected into the inner screen drum with holes. When the liquid level reaches a preset value, the power system drives the connecting rod to quickly extend and retract back and forth, thereby driving the inner screen drum with holes to shake. During this period, the liquid inlet pipe continues to inject water to keep the water level in the inner screen drum with holes basically unchanged, until the turbidity meter in the discharge pipe reaches the preset value, the power system drives the connecting rod to extend and retract back and forth quickly, thereby driving the inner screen drum with holes to shake. During this period, the liquid inlet pipe continues to inject water to keep the water level in the inner screen drum with holes basically unchanged. The system stops; the reason why the perforated inner sieve drum is placed in the air before screening and washing in the present invention is, on the one hand, because the weighing device may be broken during the shaking of the perforated inner sieve drum, and on the other hand, it is also to better clean the sand material at the bottom of the perforated inner sieve drum; when the turbidity meter in the discharge pipe reaches the preset value, the power system stops; the perforated inner sieve drum stops shaking, and the liquid inlet pipe stops injecting water. At this time, the drying device starts to dry the remaining wet material in the perforated inner sieve drum; after the drying is completed, the connecting rod moves to the lowest point along the slide rail, and the perforated inner sieve drum contacts the weighing device again, and the mass after drying can be read. The data before and after are calculated and processed by the data acquisition printer to obtain the mud content of the aggregate; and in the process of screening and washing the filler inside the perforated inner sieve drum, the telescopic connecting rod is used to extend and retract to achieve the shaking of the perforated inner sieve drum during the cleaning process, so that the screening and washing is more thorough and the screening and washing efficiency is improved. That is, the present invention realizes efficient and accurate mud content determination through the mutual cooperation and coordination of the perforated inner sieve drum, the telescopic connecting rod, the vertical drive device, the drying device, and the weighing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0035] Figure 1 It is a front cross-sectional schematic diagram of the structure of the present invention;

[0036] Figure 2 It is a top view of the structure of the present invention.

[0037] In the figure: 1. outer cylinder; 2. outer cylinder cover; 3. inner sieve cylinder with holes; 4. connecting rod; 5. slide rail; 6. heating wire; 7. air supply port; 8. liquid inlet pipe; 9. liquid discharge pipe; 10. turbidity meter; 11. liquid level meter; 12. control system; 13. data acquisition printer; 14. weighing device; 15. blower; 16. reading screen; 17. printing outlet. DETAILED DESCRIPTION

[0038] The technical solution of the embodiment of the present invention will be fully described below in conjunction with examples of the present invention.

[0039] It should be noted that, in the description of the present invention, terms such as "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Reference Figure 1 The present embodiment discloses a test device and a test method for testing the mud content of fillers, wherein the test device for testing the mud content comprises a perforated inner sieve drum, a retractable connecting rod, a vertical driving device, a drying device, and a weighing device, wherein a liquid inlet pipe is arranged at the top of the outer cylinder, a liquid discharge pipe is arranged at the bottom, and a slide rail and a vertical driving device are arranged on the inner wall of the outer cylinder, a slider is arranged on the slide rail, and the slider is driven up and down by the vertical driving device; the perforated inner sieve drum is arranged in the outer cylinder, and the perforated inner sieve drum is connected to the slider on the slide rail through a plurality of retractable connecting rods; a weighing device is also arranged at the bottom of the outer cylinder; a drying device for drying sand and gravel aggregate is arranged on the inner wall of the outer cylinder; the control system realizes the up and down movement of the perforated inner sieve drum by controlling the vertical driving device, thereby realizing the separation or contact between the perforated inner sieve drum and the weighing device; the control system controls the extension and retraction of the connecting rod to realize the shaking of the perforated inner sieve drum; the control system controls the drying device to realize the drying of the aggregate. The present invention realizes efficient and accurate mud content determination through the mutual cooperation and coordination of the perforated inner sieve drum, the telescopic connecting rod, the vertical driving device, the drying device and the weighing device.

[0042] Specifically, refer to Figure 1 , a test device for testing the mud content of fillers, comprising an outer cylinder 1, an inner screen cylinder with holes 3, a control system 12, a data acquisition printer 13, a weighing device 14, a water injection pipe 8, a liquid discharge pipe 9, a liquid level meter 11 and a turbidity meter 10;

[0043] The top of the outer cylinder 1 is provided with a mounting opening, and the outer cylinder cover 2 is detachably connected to the outer cylinder 1, and the outer cylinder cover 2 is covered on the mounting opening; it is convenient to install the inner sieve cylinder 3 with holes. When the inner sieve cylinder 3 with holes needs to be installed, the outer cylinder cover 2 is opened, and the inner sieve cylinder 3 with holes is placed in the outer cylinder 1. After the placement is completed, the outer cylinder cover 2 is covered; when the test is completed and the inner sieve cylinder 3 with holes needs to be taken out, the outer cylinder cover 2 on the outer cylinder 1 is opened again to take out the inner sieve cylinder 3 with holes;

[0044] The perforated inner sieve cylinder 3 is used to be installed inside the outer cylinder 1. The perforated inner sieve cylinder 3 is set to be a hollow cylindrical shape. The perforated inner sieve cylinder 3 is a metal cylinder, and is made of a metal mesh with a standard mesh of 0.075 mm on all sides. The upper end of the perforated inner sieve cylinder 3 is set to be an opening, and the opening is a filling port;

[0045] Four slide rails 5 are arranged in the middle of the inner wall of the outer cylinder 1, and the four slide rails 5 are arranged along the height direction of the inner wall of the outer cylinder 1. Slide blocks are arranged on the four slide rails 5; a power rotation device is also arranged on the side of the slide rail 5, such as an existing screw transmission device, and the screw transmission device drives the slide block to move along the slide rail;

[0046] Four retractable sliding connecting rods 4 are arranged on the side wall of the perforated inner screen drum 3 in this embodiment, one connecting rod is connected to a corresponding slider, and after the connecting rod 4 is connected to the slider, it can move up and down along the above-mentioned slide rail 5, thereby realizing the up and down movement of the perforated inner screen drum 3, and realizing its contact or separation with the weighing device 14; the weighing device 14 is installed above the bottom of the outer cylinder;

[0047] At the same time, the extension and retraction of the connecting rod 4 is controlled by the control system, and the shaking of the perforated inner sieve drum 3 can be achieved by controlling the extension and retraction of the connecting rod 4; the shaking of the perforated inner sieve drum is achieved by driving the extension and retraction of the sliding connecting rod through the power system, so that the sand and gravel aggregates roll in the perforated inner sieve drum, effectively avoiding the damage to the sand and gravel aggregates and ensuring the full washing of the sand and gravel, improving the screening and washing effect, and reducing the problem of mechanical stirring damaging the aggregates. At the same time, the reason why the perforated inner sieve drum is set in the air before screening and washing in the present invention is, on the one hand, because the weighing device may be broken during the shaking of the perforated inner sieve drum, and on the other hand, it is also to better clean the sand at the bottom of the perforated inner sieve drum;

[0048] Reference Figure 1The drying device includes an electric heating wire 6, an air supply port 7, and a blower 15. The electric heating wire 6 in this embodiment is spirally wound and connected to the inner wall of the outer cylinder 1. The air supply port 7 is a multi-hole hinge type. The air supply port 7 is arranged in multiple areas of the inner wall of the outer cylinder 1, and the blower 15 is arranged outside the outer cylinder 1; the blower 15 is connected to the air supply port 7 to blow air into the interior of the outer cylinder 1, and at the same time combines with the electric heating wire 6 to achieve drying of the remaining wet material in the perforated inner sieve cylinder; during the entire test process, the drying device is mainly used to dry the aggregate to ensure the accuracy of the test, and the drying device is started only when the turbidity meter reaches a preset value. Therefore, the drying device in this embodiment needs to cooperate with other devices to finally achieve the test of the mud content.

[0049] Furthermore, in order to improve the drying efficiency and optimize the drying effect, the air supply port 7 is arranged around the inner wall of the entire outer cylinder 1, and the arrangement area of ​​the air supply port 7 can basically cover the entire side wall of the perforated inner sieve cylinder 3.

[0050] Reference Figure 1 Furthermore, a liquid inlet pipe 8 is provided on the upper part of the inner wall of the outer cylinder 1, and the liquid inlet pipe 8 extends horizontally from the inner wall of the outer cylinder 1 to the top of the inner sieve cylinder 3 with holes; it is used to inject water into the inner sieve cylinder 3 with holes; at the same time, a liquid level gauge 11 is provided inside the inner sieve cylinder 3 with holes; the liquid level gauge 11 is connected to the inner bottom of the inner sieve cylinder 3 with holes, and is used to detect the liquid level of the injected water and control the injection amount of water; during the whole test process, the liquid inlet pipe 8 continuously injects water to keep the water level in the inner sieve cylinder 3 with holes basically unchanged, until the turbidity meter 10 in the discharge pipe 9 reaches the preset value, and then the power system stops;

[0051] Furthermore, solenoid valves are provided on the liquid inlet pipe 8 and the liquid discharge pipe 9 to control the opening or closing of the liquid inlet pipe 8 and the liquid discharge pipe 9 .

[0052] Furthermore, the drain pipe 9 in this embodiment is connected to the outer wall of the outer cylinder 1 and is connected to the interior of the outer cylinder 1. The inner bottom of the outer cylinder 1 is inclined, and the drain pipe 9 is arranged at the lower end near the inner bottom of the outer cylinder 1. A turbidity meter 10 is connected to the inner wall of the drain pipe 9 for detecting the turbidity of the liquid; until the turbidity meter 10 in the drain pipe 9 reaches a preset value, the power system stops.

[0053] Furthermore, the perforated inner sieve cylinder has sieve holes of 0.075 mm all around;

[0054] Furthermore, the control system 12 is connected to the outer wall of the outer cylinder 1, and the blower 15, the weighing device 14, the liquid level meter 11, the turbidity meter 10, the air outlet 7, the heating wire 6, the solenoid valve, and the data acquisition printer 13 are all electrically connected to the control system 12; the weighing device 14 is located below the perforated inner sieve cylinder, and the weighing device is connected to the data acquisition printer; the data acquisition printer is detachably and independently arranged outside the outer cylinder, and the data acquisition printer is used for data collection, processing and printing;

[0055] When the solenoid valve on the liquid inlet pipe 8 is opened, the air supply port is closed, and the water injection port starts to inject water into the perforated inner sieve drum. When the limit value of the liquid level gauge is reached, the connecting rod quickly retracts back and forth, and the perforated inner sieve drum starts to shake. Dust, silt and clay with a particle size of less than 0.075 mm in the aggregate are separated from the aggregate through the sieve holes around the perforated inner sieve drum along with the water, and slide out of the liquid discharge pipe through the inclined bottom of the outer cylinder; when the discharged sewage reaches the preset standard of the turbidity meter, the perforated inner sieve drum stops shaking, the solenoid valve on the liquid inlet pipe is closed, the water injection is stopped, the heater and the blower are turned on, the hinge of the air supply port is opened, and the sand and gravel are started to be dried; automatic water injection and drying are realized through the control logic among the controller, the liquid level gauge, the turbidity meter, the liquid inlet solenoid valve, the heater, the blower and the air supply port;

[0056] The present invention adopts the above technical scheme to achieve that when feeding, the connecting rod is at the lowest point of the slide rail, the inner screen drum with holes is in contact with the weighing device, and the mass reading of the aggregate before screening and washing can be read; when water is injected, the connecting rod of the inner screen drum with holes moves upward to the highest point along the slide rail, the inner screen drum with holes is separated from the weighing device, and after it is in a suspended state, water is injected into the inner screen drum with holes. When the liquid level reaches a preset value, the power system drives the connecting rod to quickly extend and retract back and forth, thereby driving the inner screen drum with holes to shake. During this period, the liquid inlet pipe continues to inject water to keep the water level in the inner screen drum with holes basically unchanged, until the turbidity meter in the discharge pipe reaches the preset value, the power system drives the connecting rod to extend and retract back and forth quickly, thereby driving the inner screen drum with holes to shake. During this period, the liquid inlet pipe continues to inject water to keep the water level in the inner screen drum with holes basically unchanged. The system stops; the reason why the perforated inner sieve drum is placed in the air before screening and washing is, on the one hand, because it is feared that the weighing device will be broken during the shaking of the perforated inner sieve drum, and on the other hand, it is also to better clean the sand material at the bottom of the perforated inner sieve drum; when the turbidity meter in the discharge pipe reaches the preset value, the power system stops; the perforated inner sieve drum stops shaking, and the liquid inlet pipe stops injecting water. At this time, the drying device starts to dry the remaining wet material in the perforated inner sieve drum; after the drying is completed, the connecting rod moves to the lowest point along the slide rail, and the perforated inner sieve drum contacts the weighing device again, and the mass after drying can be read. The data before and after are calculated and processed by the data acquisition printer to obtain the mud content of the aggregate; and in the process of screening and washing the filler inside the perforated inner sieve drum, the telescopic connecting rod is used to extend and retract to achieve the shaking of the perforated inner sieve drum during the cleaning process, so that the screening and washing is more thorough and the screening and washing efficiency is improved. That is, the present invention realizes efficient and accurate mud content determination through the mutual cooperation and coordination of the perforated inner sieve drum, the telescopic connecting rod, the vertical drive device, the drying device, and the weighing device.

[0057] Combined with the structure of the above-mentioned screening and washing device, the application of the screening and washing device is further described:

[0058] Pour a road aggregate sample of a specified mass into the perforated inner sieve drum 3, and the mass m0 can be read on the mass reading screen 16 on the data acquisition printer 13;

[0059] Start the control system 12, the connecting rod 4 moves the perforated inner screen drum 3 along the slide rail 5 to the highest point, so that the perforated inner screen drum 3 is separated from the weighing device 14.

[0060] Then the liquid inlet pipe 8 starts to inject water into the perforated inner sieve drum 3. When the liquid level meter 11 reaches a preset value, the power system drives the connecting rod 4 to quickly extend and retract back and forth, thereby driving the perforated inner sieve drum 3 to shake (specifically, for example, the connecting rod 4 on one side extends, and the connecting rod 4 on the other side retracts, and the perforated inner sieve drum 3 shakes by continuous reciprocating extension and retraction). During this period, the liquid inlet pipe 8 continues to inject water to keep the water level in the perforated inner sieve drum 3 basically unchanged, until the turbidity meter 10 in the discharge pipe 9 reaches a preset value, and then the power system stops;

[0061] The perforated inner sieve drum 3 stops shaking, and the liquid inlet pipe 8 stops injecting water. At this time, the electric heating wire 6 starts heating, the air outlet 7 hinge opens, and the blower 15 starts to dry the remaining wet material in the perforated inner sieve drum;

[0062] After drying, the remaining mass m1 is read on the mass reading screen 16 on the data acquisition printer 13;

[0063] Calculate the aggregate mud content Q: Q = 100% × (m0-m1) / m0;

[0064] Finally, the final result can be printed at the print outlet 17 of the data acquisition printer 13 according to demand.

[0065] By adopting the above technical solution, the connecting rod is at the lowest point of the slide rail during feeding, and the perforated inner screen drum contacts the weighing device, so the mass reading before screening and washing can be read; when water is injected, the connecting rod moves upward to the highest point along the slide rail, and the perforated inner screen drum is separated from the weighing device; after drying, the connecting rod moves to the lowest point along the slide rail, and the perforated inner screen drum contacts the weighing device again, so the mass after drying can be read. The data before and after are calculated and processed by the data acquisition printer to obtain the aggregate mud content, and finally print the result;

[0066] The test device for testing the mud content of aggregate of the present invention can screen and wash sand, and utilize the rotation of the perforated inner sieve drum to fully clean water and mud and separate mud from fine material, and filter it through the filtering device so that the fine material remains in the inner drum, and through repeated washing, fine material that meets the requirements is obtained, and the mud content of the aggregate is calculated after drying. The present invention can effectively reduce the work difficulty and work intensity of the staff and improve the efficiency of mud content detection.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A test device for testing the mud content of aggregate, characterized in that: It includes an outer cylinder, a perforated inner sieve drum and a control system; a liquid inlet pipe is arranged on the top of the outer cylinder, a liquid discharge pipe is arranged on the bottom, and a slide rail and a vertical driving device are arranged on the inner wall of the outer cylinder, a slider is arranged on the slide rail, and the slider is driven to move up and down by the vertical driving device; the perforated inner sieve drum is arranged in the outer cylinder, and the perforated inner sieve drum is connected to the slider on the slide rail through a plurality of retractable connecting rods; a weighing device is also arranged at the bottom of the outer cylinder; a drying device for drying sand and gravel aggregates is arranged on the inner wall of the outer cylinder; the control system realizes the up and down movement of the perforated inner sieve drum by controlling the vertical driving device, and then realizes the separation or contact between the perforated inner sieve drum and the weighing device; the control system controls the extension and retraction of the connecting rod to realize the shaking of the perforated inner sieve drum; the control system controls the drying device to realize the drying of the aggregate.

2. The test device for testing the mud content of aggregate according to claim 1, characterized in that: The drying device comprises a blower, a heater and an air supply port. The heater and the air supply port are arranged on the inner wall of the outer cylinder, and the blower supplies air to the air supply port.

3. The test device for testing the mud content of aggregate according to claim 1, characterized in that: The heater is an electric heating wire, which is spirally wound and arranged inside the cylinder wall of the outer cylinder.

4. The test device for testing the mud content of aggregate according to claim 1, characterized in that: The air supply outlet is of a multi-hole hinge type, and the air supply outlet is arranged in multiple areas of the inner wall of the outer cylinder. The air supply outlet can be controlled to open and close by a control system.

5. The test device for testing the mud content of aggregate according to claim 1, characterized in that: A barrel cover is provided on the top of the outer cylinder, and a water injection port is provided on the inner wall of the outer cylinder. The water injection port is located at the upper part of the inner sieve cylinder with holes. The water injection port is externally connected to a liquid inlet pipe, and water is injected into the inner sieve cylinder with holes through the liquid inlet pipe. A liquid inlet solenoid valve is provided on the liquid inlet pipe.

6. The test device for testing the mud content of aggregate according to claim 1, characterized in that: The bottom of the inner wall of the outer cylinder is inclined, and a drainage pipe is arranged at the lowest point of the inclined bottom, through which sewage in the perforated inner sieve cylinder is discharged, and a turbidity meter is arranged in the drainage pipe.

7. The test device for testing the mud content of aggregate according to claim 1, characterized in that: A liquid level gauge is arranged in the perforated inner screen cylinder.

8. The test device for testing the mud content of aggregate according to claim 1, characterized in that: The weighing device is connected with a data acquisition printer.

9. The test device for testing the mud content of aggregates according to claim 8, characterized in that: The data collection printer is detachably and independently arranged outside the outer cylinder body, and is used for data collection, processing and printing.

10. The method for measuring the aggregate mud content using the test device according to any one of claims 1 to 9, characterized in that: Pour the specified mass of road aggregate sample into the perforated inner sieve drum, and weigh the mass m0 with the weighing device; Start the control system, and the connecting rod moves the perforated inner screen drum along the slide rail to the highest point, so that the perforated inner screen drum is separated from the weighing device; Then the liquid inlet pipe starts to inject water into the perforated inner sieve drum. When the liquid level reaches the preset value, the power system drives the connecting rod to quickly extend and retract back and forth, thereby driving the perforated inner sieve drum to shake. During this period, the liquid inlet pipe continues to inject water to keep the water level in the perforated inner sieve drum basically unchanged. When the turbidity meter in the discharge pipe reaches the preset value, the power system stops. The perforated inner sieve drum stops shaking, and the liquid inlet pipe stops injecting water. At this time, the drying device starts to dry the remaining wet material in the perforated inner sieve drum; After drying, the connecting rod moves the perforated inner screen drum along the slide rail to the lowest point, so that the perforated inner screen drum contacts the weighing device; the remaining mass m1 is read; Calculate the mud content of aggregate.

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