A device and method for detecting moisture content of machine-made sand

Abstract

The present invention discloses a device for detecting the moisture content of machine-made sand and a detection method thereof, comprising a sampling module, a sample feeding and weighing module, a baking module, and a controller; the sampling module comprises a base, a telescopic rod, a first rotating horizontal arm, a sampling rod, and a sampling bucket; the sample feeding and weighing module comprises a vertical rod, a second rotating horizontal arm, a sample receiving tray, and a weighing sensor; the baking module comprises a drying chamber, and the sample receiving tray is rotated into the interior of the drying chamber to perform a drying operation; the moisture content detection device has high flexibility, is easy to install and use, can perform moisture detection for machine-made sand online, and obtains the moisture content by adopting the weight loss ratio method, which is simple and effective, can reflect the moisture content of the machine-made sand accurately and in real time, is conducive to timely adjustment of the production process to control the moisture content of the machine-made sand produced, and provides guarantee for the normal operation of the production line.

Description

Technical Field

[0001] The present invention relates to the technical field of machine-made sand moisture detection, and in particular to a machine-made sand moisture content detection device and a detection method thereof. Background Art

[0002] Artificial sand refers to sand produced by a sand making machine and other ancillary equipment. It can be processed into sand of varying sizes and shapes based on specific process requirements, better meeting daily needs. Stone is initially crushed in a coarse crusher, and the resulting coarse material is then conveyed by a belt conveyor to a fine crusher for further crushing. The finely crushed stone then passes through a vibrating screen, where it is separated into two types of gravel. The gravel that meets the feed size of the sand making machine is used to make the manufactured sand, while the remaining material is returned to the fine crusher. Artificial sand production is typically carried out on a large-scale, automated basis using a manufactured sand production line.

[0003] There are many indicators that need to be tested in the production process of machine-made sand to ensure the product quality of the machine-made sand. For example, the moisture content of machine-made sand is very important for machine-made sand. It is generally tested through manual sampling. This testing method cannot meet the online testing requirements of online production.

[0004] In order to improve the speed of online moisture detection, many types of sensors are also used in the moisture detection of artificial sand. For example, the Chinese invention patent application (publication number: CN107064179A) discloses an online automatic detector for the moisture content of sand and gravel, which calculates and analyzes the moisture content by the capacitance change of a ceramic panel provided at the front end of the sensor; another example is the Chinese invention patent application (publication number: CN111948170A) disclosed in 2020. An online infrared moisture detection system detects moisture through infrared sensors; although the use of these sensors simplifies the difficulty of moisture detection and improves the automation level of online detection, the accuracy of moisture detection is not high. When the moisture content is lower than 2%, the detection accuracy will be significantly reduced. In addition, there are many forms of moisture in artificial sand, and these sensors can generally only detect water in unit form.

[0005] Calculating moisture content by sampling and baking is a relatively primitive and basic method. Although it takes several minutes to more than ten minutes, the detection is highly accurate and precise. The change in weight caused by the evaporation of water can be reflected. Both liquid water and crystallized water can be removed by baking.

[0006] A Chinese utility model patent (publication number: CN209055430U) disclosed in 2019 an online detection device for the moisture content of manufactured sand, which uses drying to detect the moisture content of manufactured sand. However, the device has poor flexibility and versatility, and the continuous sampling and detection effects are not good. Summary of the Invention

[0007] The purpose of the present invention is to provide a device and method for detecting the moisture content of machine-made sand in response to the problems existing in the prior art.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] A device for detecting the moisture content of machine-made sand comprises a sampling module, a sample delivery and weighing module, a baking module, and a controller;

[0010] The sampling module is arranged on one side of the machine-made sand conveyor line, and includes a rotatable base, a telescopic rod is provided above the base, a first rotating horizontal arm is connected above the telescopic rod, a sampling rod is connected to the rotating part of the first rotating horizontal arm, and a sampling bucket is provided at the end of the sampling rod, and the sampling bucket is used to dig the machine-made sand on the machine-made sand conveyor line;

[0011] The sample delivery and weighing module and the baking module are fixed to one side of the machine-made sand conveying line or the outside of the silo through a bracket; the sample delivery and weighing module includes a vertical pole fixed to the bracket, the upper end of the vertical pole is rotatably connected to at least a pair of second rotating horizontal arms, and a sample receiving tray is provided above the end of the second rotating horizontal arm, the sample receiving tray is used to receive the machine-made sand obtained by the sampling hopper, and a weighing sensor for measuring the weight of the machine-made sand is provided on the inner side of the sample receiving tray;

[0012] The baking module includes a drying chamber arranged above the bracket, the outer periphery of the drying chamber is provided with a clearance groove for the second rotating horizontal arm to pass through, the sample receiving tray rotates into the drying chamber to perform a drying operation, and the drying chamber is further provided with a shielding component at the clearance groove;

[0013] The controller is arranged on the bracket, and is electrically connected to the base, the telescopic rod, the first rotating horizontal arm, the second rotating horizontal arm's drivers, and the control module of the drying chamber.

[0014] This moisture content detection device is highly flexible, easy to install and use, and can perform moisture detection on machine-made sand online. It uses the weight loss ratio method to obtain the moisture content. It is simple and effective, and can accurately reflect the moisture content of the machine-made sand in real time, which is conducive to timely adjustment of the production process to control the moisture content of the machine-made sand produced, and provide guarantee for the normal operation of the production line.

[0015] The setting of the sampling module can automatically extract machine-made sand samples on the machine-made sand conveyor line, and can quickly obtain machine-made sand samples on the production line by rotating shovel digging without affecting the normal transportation of the production line or the normal operation of other components; the first rotating horizontal arm can rotate 360 ​​degrees in a vertical plane, so that the sampling rod can rotate to facilitate sampling in the sampling bucket; the rotation of the base can move the sampling rod away from above the machine-made sand conveyor line and move it above the sample delivery and weighing module, so as to facilitate the delivery of the obtained machine-made sand samples to the sample receiving tray; the setting of the telescopic rod facilitates the adjustment of the height of the first rotating horizontal arm, and thus adjusts the height of the sampling bucket to make it as close to the sample receiving tray as possible, so as to avoid scattering of samples during sample delivery. The sampling rod remains horizontal during the sample delivery process, which can also avoid scattering of samples in the sampling bucket.

[0016] The sample feeding and weighing module is provided with a pair of second rotating horizontal arms, so that after one sample receiving tray receives the sample and enters the drying chamber horizontally, the other sample receiving tray is outside. If the external sample receiving tray has just been rotated out of the drying chamber, it can cool down to room temperature naturally. When the temperature drops, it is enough to continue receiving samples and be recycled in sequence, which makes rational use of the heating and baking time and the natural cooling time.

[0017] The second rotating horizontal arm can also rotate independently, which makes it easier to pour the tested samples in the sample receiving tray back into the machine-made sand conveyor line. This action can be performed when the sample receiving tray passes over the machine-made sand conveyor line during the overall rotation.

[0018] The first rotating horizontal arm and the second rotating horizontal arm both include a fixed part and a rotating part, and a motor is provided in the fixed part to drive the rotating part to rotate; the outer periphery of the rotating part of the first rotating horizontal arm is connected to the sampling rod, and the fixed part is connected to the upper end of the telescopic rod; the front end of the rotating part of the second rotating horizontal arm is provided with the sample receiving plate, and the fixed part is connected to the upper end of the vertical pole through a rotating sleeve.

[0019] The weighing sensor is arranged on the inner side of the sample receiving plate, which can obtain the weight of the load above the sample receiving plate in real time. The weighing sensor can adopt a high-precision weight sensor or a mechanical sensor, which can accurately obtain the change in the weight of the load, so as to calculate the moisture content through the weight difference before and after the sample.

[0020] The controller is a PLC controller, which connects the components that require electric control and automatic control through a control chip and a control module. These components are basically based on movement functions such as rotation and lifting. The existing PLC controller can meet these needs.

[0021] Furthermore, the base is an electric turntable, and the telescopic rod is an electric telescopic rod installed on the electric turntable; the machine-made sand conveying line includes a conveyor belt arranged along the conveying direction, and the base is detachably installed on the conveyor belt brackets on both sides of the conveyor belt, and the first rotating horizontal arm is located above the conveyor belt.

[0022] The electric turntable can be fixed to the conveyor belt bracket by bolts, and can drive the overall rotation of the telescopic rod and the first rotating horizontal arm installed thereon. The sampling rod spans the conveyor belt to facilitate random sampling by the sampling bucket.

[0023] Furthermore, a discharge port is provided below the sampling hopper, and the discharge port is provided with a valve that can be opened and closed automatically. The size of the discharge port is smaller than the opening size of the sample receiving tray; the outer side wall of the sampling hopper is inclined.

[0024] A closable discharge port is provided below the sampling hopper, facilitating the direct placement of the obtained machine-made sand sample into the sample receiving tray. This operation can be performed simply by moving the sampling hopper directly above the sample receiving tray, eliminating the need for a complex pouring device. One side of the sampling hopper is tilted to facilitate scooping up more machine-made sand during rotation.

[0025] Furthermore, a small platform is provided at the end of the second rotating horizontal arm, the sample receiving tray is embedded in the small platform, small baffles are provided around the upper opening of the sample receiving tray, and the weighing sensor is provided at the bottom of the sample receiving tray.

[0026] The small platform is provided to facilitate the installation of the sample receiving tray, and the small baffle is provided above the sample receiving tray to block the machine-made sand and prevent it from falling. The weighing sensor is preset below the sample receiving tray to directly measure it.

[0027] Furthermore, a wiring hole is provided inside the front end of the second rotating horizontal arm, and the signal line of the weighing sensor is led outward along the wiring hole to avoid the influence of the temperature during baking on the signal line.

[0028] Furthermore, the give way groove is a horizontal through groove, and the shielding assembly includes a sealing curtain arranged at the give way groove. A hanging rope is connected above the sealing curtain, and the hanging rope is connected to a winding device. The winding device is arranged on the drying chamber, and the drying chamber is also provided with a micro motor for driving the winding device.

[0029] The provision of the clearance groove facilitates the direct translation of the second rotating horizontal arm into the drying chamber, allowing the sample tray to be baked in the center of the drying chamber and then conveniently rotated out after baking. To ensure the baking effect and prevent heat loss, a sealing curtain is provided inside (or outside) the clearance groove to shield the clearance groove. When the second rotating horizontal arm is about to be rotated out, the sealing curtain rises under the action of the winding device and the micro-motor, clearing the clearance groove. The micro-motor is also connected to the controller and performs the winding operation according to the sample baking rhythm.

[0030] Furthermore, the sealing curtains are a pair, with a space for accommodating the second rotating horizontal arm being left between the pair of sealing curtains, and the sealing curtains are insulation boards or insulation cloth strips. The sealing curtains are separated so that the air flows out of the space in the middle through which the second rotating horizontal arm passes.

[0031] Furthermore, the drying chamber has at least two heating modes: a low-temperature heating mode (heating temperature does not exceed 90°C), which takes longer but improves accuracy; and a high-temperature heating mode (heating temperature is between 105°C and 150°C), which allows for rapid drying. The drying chamber preferably uses irradiation and heating to reduce the use of hot air, which can prevent wind from carrying away dust in the sample and affecting detection accuracy.

[0032] Furthermore, a flange mounting plate is provided at one end of the bracket, and the flange mounting plate is screwed and fixed to the outside of the machine-made sand conveying line or the outer wall of the silo; the outer wall of the silo is also provided with a sample outlet channel, and the sample outlet channel extends outward at an angle to the top of the sample receiving plate, and an electric valve is provided in the sample outlet channel.

[0033] The setting of the bracket is relatively flexible and can also be directly installed on the silo to detect the moisture content of the machine-made sand in the silo. The sample receiving plate and the second rotating horizontal arm can still be used to detect the sample in the silo, so that the sample delivery and weighing module and the baking module have strong versatility.

[0034] Furthermore, a method for detecting the moisture content of machine-made sand is provided, the method comprising the following steps:

[0035] (1) Random sampling: During the operation of the machine-made sand conveyor line, the sampling rod rotates above the conveyor belt driven by the first rotating horizontal arm, and the sampling bucket passes through the machine-made sand below and randomly digs out a bucket of sample. The sampling bucket stops after moving to a horizontal position;

[0036] (2) Sample delivery: The sampling hopper moves to the top of the sample receiving tray under the rotation of the base, and the telescopic rod descends to make the sampling hopper close to the sample receiving tray. The sampling hopper places the sample and leaves the sample receiving tray. After the sample is obtained, the sample receiving tray weighs the initial weight m1;

[0037] (3) Drying: The sample tray is moved horizontally into the drying chamber and dried for 10-30 minutes. The weight m2 is measured after drying to a constant weight.

[0038] (4) The moisture content of the sample can be obtained by calculating the weights measured twice: (m1-m2) / m1*100%, and the detection is carried out in such an interval cycle; during the next sampling process, when the sample receiving plate moves out of the drying chamber and is located above the conveyor belt, the second rotating horizontal arm is rotated to return the sample to the machine-made sand conveyor line.

[0039] Compared with the prior art, the beneficial effects of the present invention are: 1. The moisture content detection device is highly flexible, easy to install and use, and can detect the moisture content of machine-made sand online. The moisture content is obtained by weight loss ratio, which is simple and effective, and can accurately reflect the moisture content of machine-made sand in real time, which is conducive to timely adjustment of the production process to control the moisture content of the machine-made sand produced, and provide guarantee for the normal operation of the production line; 2. The setting of the sampling module can automatically extract machine-made sand samples on the machine-made sand conveyor line, and can quickly obtain machine-made sand samples on the production line by rotating the shovel digging method without affecting the normal transportation of the production line and the normal operation of other components. During the sampling process, the sampling rod and the sampling bucket are kept in a horizontal state, which can avoid the scattering of the sample in the sampling bucket; 3. A pair of the second rotary The setting of the rotating horizontal arm allows one sample receiving tray to enter the drying chamber horizontally after receiving the sample, while the other sample receiving tray is outside. If the external sample receiving tray has just been rotated out of the drying chamber, it can naturally cool to room temperature. When the temperature drops, it is enough to continue receiving samples and use them in sequence, which makes rational use of the heating and baking time and the natural cooling time. The second rotating horizontal arm can also rotate independently, which is convenient for pouring the tested samples in the sample receiving tray back into the machine-made sand conveyor line; 4. The setting of the giveway slot on the drying chamber facilitates the direct translation of the second rotating horizontal arm into the drying chamber, so that the sample receiving tray can be baked in the middle of the drying chamber and can be rotated out after baking, which is more convenient; the setting of the liftable sealing curtain can ensure the baking effect and avoid heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the overall layout structure of a device for detecting the moisture content of machine-made sand according to the present invention;

[0041] Figure 2This is a schematic top view of the structure of a sampling module of a device for detecting moisture content in machine-made sand according to the present invention;

[0042] Figure 3 This is a schematic top view of the structure of a sample feeding and weighing module of a device for detecting the moisture content of machine-made sand according to the present invention;

[0043] Figure 4 for Figure 2 Schematic diagram of the AA cross-section structure;

[0044] Figure 5 for Figure 3 Schematic diagram of the BB cross-section structure;

[0045] Figure 6 This is a structural schematic diagram of a drying chamber of a device for detecting moisture content of machine-made sand according to the present invention;

[0046] Figure 7 This is a schematic diagram of the partially expanded structure of the side wall of the drying chamber of the present invention;

[0047] Figure 8 This is a schematic diagram of another arrangement structure of a device for detecting moisture content of machine-made sand according to the present invention;

[0048] In the figure: 1. Conveyor belt; 2. Conveyor belt bracket; 3. Silo; 4. Bracket; 5. Base; 6. Telescopic rod; 7. First rotating horizontal arm; 8. Sampling rod; 9. Sampling bucket; 901, discharge port; 10. Vertical pole; 11. Second rotating horizontal arm; 12. Drying chamber; 13. Controller; 14. Rotating sleeve; 15. Small platform; 16. Sample receiving tray; 17. Weighing sensor; 18. Wiring hole; 19. Make way slot; 20. Sealing curtain; 21. Hanging rope; 22. Winding device; 23. Sample discharge channel. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] Example 1:

[0052] like Figures 1 to 7 As shown, a device for detecting the moisture content of machine-made sand includes a sampling module, a sample delivery and weighing module, a baking module, and a controller;

[0053] The sampling module is arranged on one side of the machine-made sand conveyor line. The sampling module includes a rotatable base 5. A telescopic rod 6 is provided above the base 5. A first rotating horizontal arm 7 is connected to the top of the telescopic rod 6. A sampling rod 8 is connected to the rotating part of the first rotating horizontal arm 7. A sampling bucket 9 is provided at the end of the sampling rod 8. The sampling bucket 9 is used to dig the machine-made sand on the machine-made sand conveyor line.

[0054] The sample feeding and weighing module and the baking module are fixed to one side of the machine-made sand conveying line through a bracket 4; the sample feeding and weighing module includes a vertical rod 10 fixed to the bracket 4, the upper end of the vertical rod 10 is rotatably connected to a pair of second rotating horizontal arms 11 through a rotating sleeve 14, and a sample receiving tray 16 is provided above the end of the second rotating horizontal arm 11. The sample receiving tray 16 is used to receive the machine-made sand obtained by the sampling hopper 9, and a weighing sensor 17 for measuring the weight of the machine-made sand is provided on the inner side of the sample receiving tray 16;

[0055] The baking module includes a drying chamber 12 arranged above the bracket 4. The outer periphery of the drying chamber 12 is provided with a clearance groove 19 for the second rotating horizontal arm 11 to pass through. The sample receiving tray 16 rotates into the interior of the drying chamber 12 to perform a drying operation. The drying chamber 12 is further provided with a shielding component at the clearance groove 19.

[0056] The controller 13 is disposed on the bracket 4 , and is electrically connected to the base 5 , the telescopic rod 6 , the first rotating horizontal arm 7 , the driver of the second rotating horizontal arm 11 , and the control module of the drying chamber 12 .

[0057] This moisture content detection device is highly flexible, easy to install and use, and can perform moisture detection on machine-made sand online. It uses the weight loss ratio method to obtain the moisture content. It is simple and effective, and can accurately reflect the moisture content of the machine-made sand in real time, which is conducive to timely adjustment of the production process to control the moisture content of the machine-made sand produced, and provide guarantee for the normal operation of the production line.

[0058] The setting of the sampling module can automatically extract machine-made sand samples on the machine-made sand conveyor line, and can quickly obtain machine-made sand samples on the production line by rotating shovel digging without affecting the normal transportation of the production line or the normal operation of other components; the first rotating horizontal arm 7 can rotate 360 ​​degrees in the vertical plane, so that the sampling rod 8 can rotate to facilitate sampling by the sampling bucket 9; the rotation of the base 5 can move the sampling rod 8 away from above the machine-made sand conveyor line and move it above the sample delivery and weighing module, so as to facilitate the delivery of the obtained machine-made sand samples to the sample receiving tray 16; the setting of the telescopic rod 6 is convenient for adjusting the height of the first rotating horizontal arm 7, that is, adjusting the height of the sampling bucket 9. On the one hand, the distance from the conveyor belt can be adjusted during sampling, and on the other hand, it is close to the sample receiving tray 16 to avoid scattering of samples during sampling. The sampling rod 8 remains horizontal during the sampling process, which can also avoid scattering of samples in the sampling bucket 9.

[0059] The sample feeding and weighing module is provided with a pair of second rotating horizontal arms 11, so that after one sample receiving tray 16 receives the sample, it enters the drying chamber 12 horizontally, and the other sample receiving tray 16 is outside. If the external sample receiving tray has just been rotated out of the drying chamber 12, it can naturally cool to room temperature. When the temperature drops, it is enough to continue receiving samples and be recycled in sequence, which reasonably utilizes the heating and baking time and the natural cooling time.

[0060] The second rotating horizontal arm 11 can also rotate independently, which makes it easier to pour the tested samples in the sample receiving tray 16 back into the machine-made sand conveyor line. This action can be performed when the sample receiving tray passes over the machine-made sand conveyor line during the overall rotation.

[0061] The first rotating horizontal arm 7 and the second rotating horizontal arm 11 both include a fixed part and a rotating part, and a motor is provided in the fixed part to drive the rotating part to rotate; the outer periphery of the rotating part of the first rotating horizontal arm 7 is connected to the sampling rod 8, and the fixed part is connected to the upper end of the telescopic rod 6; the front end of the rotating part of the second rotating horizontal arm 11 is provided with the sample receiving plate 16, and the fixed part is connected to the upper end of the vertical pole 10 through a rotating sleeve 14.

[0062] The weighing sensor 17 is provided inside the sample receiving tray 16, which can obtain the weight of the load above the sample receiving tray in real time and accurately obtain the change in the weight of the load, so as to calculate the moisture content by the weight difference before and after the sample.

[0063] The controller 13 is a PLC controller, which connects the components that require electric control and automatic control through a control chip and a control module. These components are basically based on movement functions such as rotation and lifting. The existing PLC controller can meet these requirements.

[0064] Furthermore, the base 5 is an electric turntable, and the telescopic rod 6 is an electric telescopic rod installed on the electric turntable; the artificial sand conveyor line includes a conveyor belt 1 arranged along the conveying direction, and the base 5 is detachably installed on the conveyor belt bracket 2 on both sides of the conveyor belt, and the first rotating horizontal arm 7 is located above the conveyor belt 1.

[0065] The electric turntable can be fixed to the conveyor belt bracket 2 by bolts, and can drive the overall rotation of the telescopic rod 6 and the first rotating horizontal arm 7 installed thereon. The sampling rod 8 spans the conveyor belt 1, making it convenient for the sampling bucket 9 to take random samples.

[0066] Furthermore, a discharge port 901 is provided below the sampling hopper 9, and the discharge port 901 is provided with an electric valve that can be opened and closed automatically. The size of the discharge port 901 is smaller than the opening size of the sample receiving tray 16; the outer wall of the sampling hopper 9 is inclined.

[0067] An openable and closable discharge port 901 is provided below the sampling hopper 9, facilitating the direct placement of the obtained machine-made sand sample onto the sample receiving tray 16. This operation can be performed simply by moving the sampling hopper 9 to the position directly above the sample receiving tray, which is relatively simple and does not require a complex pouring device. One side of the sampling hopper 9 is tilted to facilitate scooping up more machine-made sand during rotation.

[0068] Furthermore, a small platform 15 is provided at the end of the second rotating horizontal arm 11 , the sample receiving tray 16 is embedded in the small platform 15 , small baffles are provided around the upper opening of the sample receiving tray 16 , and the weighing sensor 17 is provided at the bottom of the sample receiving tray 16 .

[0069] The small platform 15 is provided to facilitate the installation of the sample tray 16. The small baffle is provided above the sample tray 16 to block the machine-made sand and prevent it from falling. The weighing sensor 17 is preset below the sample tray 16 to measure it directly.

[0070] Furthermore, a wiring hole 18 is provided inside the front end of the second rotating horizontal arm 11 , and the signal line of the weighing sensor 17 is led outward along the wiring hole 18 to avoid the influence of the temperature during baking on the signal line.

[0071] Furthermore, the give way groove 19 is a horizontal through groove, and the shielding assembly includes a sealing curtain 20 arranged at the give way groove 19, and a hanging rope 21 is connected above the sealing curtain 20, and the hanging rope 21 is connected to a winding device 22, and the winding device 22 is arranged on the drying chamber 12, and the drying chamber 12 is also provided with a micro motor for driving the winding device 22.

[0072] The provision of the clearance groove 19 facilitates the direct translation of the second rotating horizontal arm 11 into the drying chamber 12, allowing the sample receiving tray 16 to be baked in the middle of the drying chamber 12 and then rotated out after baking, which is more convenient. To ensure the baking effect and prevent heat loss, the sealing curtain 20 is provided outside the clearance groove 19 to cover the clearance groove 19. When the second rotating horizontal arm 11 is about to be rotated out, the sealing curtain 20 can rise again under the action of the winding device 22 and the micro motor, making way for the clearance groove 19. The micro motor is also connected to the controller and performs the winding operation according to the rhythm of the sample baking.

[0073] Furthermore, the sealing curtains 20 are a pair, with a space for accommodating the second rotating horizontal arm 11 being left between the pair of sealing curtains 20. The sealing curtains 20 are heat-insulating fabric strips. The sealing curtains 20 are separated so that the space where the second rotating horizontal arm 11 passes is opened.

[0074] Furthermore, the drying chamber 12 has at least two heating modes: a low-temperature heating mode at a heating temperature of approximately 80°C, which takes longer but provides relatively higher accuracy; and a high-temperature heating mode at a heating temperature of 110°C, which allows for faster drying. The drying chamber 12 preferably utilizes both irradiation and heating to minimize the use of hot air, which can remove dust from the sample and affect detection accuracy.

[0075] Example 2:

[0076] Combine Figures 1 to 7 As shown, a method for detecting the moisture content of machine-made sand comprises the following steps:

[0077] (1) Random sampling: During the operation of the conveyor belt 1 of the machine-made sand conveyor line, the sampling rod 8 rotates above the conveyor belt 1 driven by the first rotating horizontal arm 7, and the sampling bucket 9 passes through the machine-made sand below and randomly digs out a bucket of sample. The sampling bucket 9 stops after moving to the horizontal position;

[0078] (2) Sample delivery: The base 5 rotates, driving the telescopic rod 6, the first rotating horizontal arm 7 and the sampling rod 8 to move horizontally, so that the sampling hopper 9 moves to the top of the sample receiving tray 16, and the telescopic rod 6 descends so that the discharge port 901 of the sampling hopper 9 approaches the sample receiving tray 16, and the sampling hopper 9 releases the obtained machine-made sand sample and leaves the sample receiving tray 16; the sample receiving tray 16 obtains the machine-made sand sample and weighs the initial weight m1;

[0079] (3) Drying: The rotating sleeve 14 on the vertical pole 10 is rotated by the drive of the motor, so that the sample receiving tray 16 carrying the machine-made sand sample is horizontally moved into the drying chamber 12 for drying for 10-30 minutes. After drying to a constant weight, the weight m2 is measured;

[0080] (4) Calculate the weights of the two measurements to get the moisture content of the sample: (m1-m2) / m1*100%, and repeat the test in this way;

[0081] During the next sampling process, when the sample receiving tray 16 moves out of the drying chamber 12 and moves above the conveyor belt 1, the second rotating horizontal arm 11 is rotated to return the tested machine-made sand sample to the machine-made sand conveyor line; the other sample receiving tray enters the drying chamber 12 for testing again after obtaining the new sample, and the sample receiving tray that was previously hotter when it came out of the drying chamber 12 can be naturally cooled outside, which does not affect the continuity of the sample detection.

[0082] Example 3:

[0083] This embodiment provides a way to take samples from a silo.

[0084] like Figure 8 As shown, one end of the bracket 4 is provided with a flange mounting plate, and the flange mounting plate is screwed and fixed to the outer wall of the silo 3; the outer wall of the silo 3 is also provided with a sample outlet channel 23, and the sample outlet channel 23 extends outward at an angle to the top of the sample receiving plate 16, and an electric valve is provided in the sample outlet channel 23.

[0085] The setting of the bracket 4 is relatively flexible and can also be directly installed on the silo 3 to detect the moisture content of the machine-made sand in the silo 3. The sample receiving plate 16 and the second rotating horizontal arm 11 can still be used to detect the sample in the silo 3, so that the sample delivery and weighing module and the baking module have strong versatility.

[0086] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the moisture content of machine-made sand, characterized in that: It includes sampling module, sample delivery and weighing module, baking module, and controller; The sampling module is arranged on one side of the machine-made sand conveyor line, and includes a rotatable base, a telescopic rod is provided above the base, a first rotating horizontal arm is connected above the telescopic rod, a sampling rod is connected to the rotating part of the first rotating horizontal arm, and a sampling bucket is provided at the end of the sampling rod, and the sampling bucket is used to dig the machine-made sand on the machine-made sand conveyor line; The sample sending and weighing module and the baking module are fixed to one side of the machine-made sand conveying line or the outside of the silo through a bracket; the sample sending and weighing module includes a vertical pole fixed to the bracket, the upper end of the vertical pole is rotatably connected to at least one pair of second rotating horizontal arms, and a sample receiving tray is provided above the end of the second rotating horizontal arm, the sample receiving tray is used to receive the machine-made sand obtained by the sampling bucket, and a weighing sensor for measuring the weight of the machine-made sand is provided on the inner side of the sample receiving tray; a small platform is provided at the end of the second rotating horizontal arm, and the sample receiving tray is embedded in the small platform, and small baffles are provided around the upper opening of the sample receiving tray, and the weighing sensor is provided at the bottom of the sample receiving tray; The baking module includes a drying chamber arranged above the bracket, the outer periphery of the drying chamber is provided with a clearance groove for the second rotating horizontal arm to pass through, the sample receiving tray rotates into the drying chamber to perform a drying operation, and the drying chamber is further provided with a shielding component at the clearance groove; the sample feeding and weighing module is provided with a pair of second rotating horizontal arms so that after receiving the sample, one sample receiving tray enters the drying chamber horizontally, and the other sample receiving tray is located outside; The controller is arranged on the bracket, and is electrically connected to the base, the telescopic rod, the first rotating horizontal arm, the second rotating horizontal arm's drivers, and the control module of the drying chamber.

2. The device for detecting moisture content of machine-made sand according to claim 1, characterized in that: The base is an electric turntable, and the telescopic rod is an electric telescopic rod installed on the electric turntable; the machine-made sand conveying line includes a conveyor belt arranged along the conveying direction, and the base is detachably installed on the conveyor belt brackets on both sides of the conveyor belt, and the first rotating horizontal arm is located above the conveyor belt.

3. The device for detecting moisture content of machine-made sand according to claim 1, characterized in that: A discharge port is provided below the sampling hopper, and the discharge port is provided with a valve that can be opened and closed automatically. The size of the discharge port is smaller than the opening size of the sample receiving tray; the outer side wall of the sampling hopper is inclined.

4. The device for detecting moisture content of machine-made sand according to claim 1, characterized in that: A wiring hole is further provided inside the front end of the second rotating horizontal arm, and the signal line of the weighing sensor is led outward along the wiring hole.

5. The device for detecting moisture content of machine-made sand according to claim 1, characterized in that: The give way groove is a horizontal through groove, and the shielding assembly includes a sealing curtain arranged at the give way groove. A hanging rope is connected above the sealing curtain, and the hanging rope is connected to a winding device. The winding device is arranged on the drying chamber, and the drying chamber is also provided with a micro motor to drive the winding device.

6. The device for detecting moisture content of machine-made sand according to claim 5, characterized in that: The sealing curtains are a pair, and a space for accommodating the second rotating horizontal arm is reserved between the pair of sealing curtains. The sealing curtains are insulation boards or insulation cloth strips.

7. The device for detecting moisture content of machine-made sand according to claim 1, characterized in that: The drying chamber has at least two heating modes, one is a low-temperature heating mode: the heating temperature does not exceed 90°; the other is a high-temperature heating mode: the heating temperature is between 105° and 150°.

8. The device for detecting moisture content of machine-made sand according to claim 1, characterized in that: A flange mounting plate is provided at one end of the bracket, and the flange mounting plate is screwed and fixed to the outside of the machine-made sand conveying line or the outer wall of the silo; the outer wall of the silo is also provided with a sample outlet channel, and the sample outlet channel extends outward at an angle to the top of the sample receiving plate, and an electric valve is provided in the sample outlet channel.

9. A detection method for the moisture content detection device of machine-made sand according to claim 1, characterized in that: The detection method comprises the following steps: (1) Random sampling: During the operation of the machine-made sand conveyor line, the sampling rod rotates above the conveyor belt driven by the first rotating horizontal arm, and the sampling bucket passes through the machine-made sand below and randomly digs out a bucket of sample. The sampling bucket stops after moving to a horizontal position; (2) Sample delivery: The sampling hopper moves to the top of the sample receiving tray under the drive of the rotation of the base, and the telescopic rod descends to make the sampling hopper close to the sample receiving tray. The sampling hopper places the sample and leaves the sample receiving tray. After the sample is obtained, the sample receiving tray weighs the initial weight m1; (3) Drying: The sample tray is moved horizontally into the drying chamber and dried for 10-30 minutes. The weight m2 is measured after drying to a constant weight. (4) The moisture content of the sample is calculated by calculating the weights measured twice: (m1-m2) / m1*100%, and the test is repeated in this way; during the next sampling process, when the sample receiving tray is moved out of the drying chamber and positioned above the conveyor belt, the second rotating horizontal arm is rotated to return the sample to the machine-made sand conveyor line.

Images