Method and device for measuring air permeability of molding sand

Abstract

The invention discloses a method and a device for measuring the air permeability of molding sand, belongs to the technical field of casting molding sand detection, and solves the problems of errors and low detection efficiency in existing molding sand air permeability detection. The device comprises a measuring work box, a first supporting frame is arranged on one side of the top of the measuring work box, a feeding device is arranged on the first supporting frame, a second supporting frame is arranged on one side of the first supporting frame, a pressing device is arranged on the second supporting frame, a moving groove body is arranged between the first supporting frame and the second supporting frame, and a clamping device is arranged on the moving groove body. A sample cylinder is movably inserted into the movable groove body, a driving assembly for driving the movable groove body to move is arranged on the measurement working box, and a sample seat for placing the sample cylinder is arranged on the other side of the top of the measurement working box. According to the method and the device for measuring the air permeability of the molding sand, the air permeability of the molding sand can be detected on site under the condition that the measurement precision is guaranteed, and the production efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of detection of casting molding sand, and particularly relates to a method and device for measuring the permeability of molding sand. Background Art

[0002] Currently, the casting industry still mainly uses ordinary green sand casting. The quality of the molding sand has a direct and important impact on the casting, and the permeability of the molding sand is one of the important indicators of the molding sand. When the permeability of the molding sand is insufficient, the gas in the mold cavity is not easily discharged. Once it enters the casting, pores will be generated in the casting, or boiling will occur during the casting process, resulting in damage to the casting. When the permeability of the molding sand is too high, the surface of the casting is rough, and sometimes mechanical sand adhesion exists, affecting the quality of the casting. Therefore, it is necessary to detect the permeability of the molding sand.

[0003] When detecting the permeability of the molding sand, the humidity of the molding sand directly affects its physical properties, such as permeability, compactness, etc. Too high or too low humidity will have an adverse impact on the performance of the molding sand, resulting in inaccurate measurement results. In the existing measurement process, if it is desired to measure in a constant humidity environment, it is usually only possible in a laboratory. It is necessary to first send a sample of the molding sand from the first muller to the detection point for detection, resulting in an extended production cycle and low production efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and device for measuring the permeability of molding sand in view of the above deficiencies of the prior art. Under the condition of ensuring the measurement accuracy, the permeability of the molding sand can be detected on site, effectively improving the production efficiency, and having the characteristics of convenient use and strong practicability.

[0005] The technical solution adopted by the present invention is: a device for measuring the permeability of molding sand, including a measurement work box. One side of the top of the measurement work box is provided with a first support frame, and a feeding device is arranged on the first support frame. One side of the first support frame is provided with a second support frame, and a pressing device is arranged on the second support frame. A moving groove body is arranged between the first support frame and the second support frame, and a sample cylinder is movably inserted into the moving groove body. The measurement work box is provided with a driving component for driving the moving groove body to move. On the other side of the top of the measurement work box, there is a sample seat for placing the sample cylinder. An outer cover is arranged outside the sample seat, and a humidity sensor is arranged on the outer cover. A detection component for detecting the permeability of the molding sand is arranged in the measurement work box. The air outlet end of the detection component is communicated with the sample seat. A humidity control component for controlling the humidity is arranged outside the sample seat. The measurement work box is provided with a PLC controller with a display screen.

[0006] As a further improvement, the feeding device includes a funnel, a filter screen, an electric push rod and an inclined push block. The funnel is installed on the first support frame, the filter screen is arranged inside the funnel, the electric push rod is vertically installed on the first support frame, the inclined push block is connected to the output end of the electric push rod, and the bottom of the inclined push block is flush with the top of the sample cylinder.

[0007] Further, the pressing device includes a telescopic cylinder and a pressing piston. The telescopic cylinder is installed on the second support frame, and the output end of the telescopic cylinder is connected to the pressing piston.

[0008] Further, the driving assembly includes a driving motor, a lead screw and a guide rod. The driving motor is installed on the measurement work box. One end of the lead screw is connected to the driving motor, and the other end is rotatably connected to the first support frame. One end of the guide rod is fixedly connected to the first support frame. The moving groove body is movably inserted into the guide rod, and the moving groove body is threadedly connected to the lead screw.

[0009] Further, the detection assembly includes an air pump, a gas collection box, a gas pressure sensor, a solenoid valve and an air delivery pipe. The air pump is installed inside the measurement work box. The air pump is communicated with the gas collection box. The gas collection box is communicated with the sample seat through the air delivery pipe. The solenoid valve is installed on the air delivery pipe. The gas pressure sensor is installed on the gas collection box. The gas pressure sensor and the solenoid valve are both electrically connected to the PLC controller.

[0010] Further, the humidity control assembly includes a humidifying device and a dehumidifier. The humidifying device and the dehumidifier are both arranged inside the measurement work box, and the humidifying device and the dehumidifier are communicated with the inside of the outer cover.

[0011] Further, the humidifying device includes a water storage tank, an atomizer, a spray pipe and a plurality of nozzles. The water storage tank is installed inside the measurement work box. The input end of the atomizer is communicated with the water storage tank. The output end of the atomizer is communicated with the spray pipe. The spray pipe is arranged on the inner wall of the outer cover, and the nozzles are installed on the spray pipe.

[0012] A method for measuring the permeability of molding sand uses the above-mentioned measuring device to measure the permeability of molding sand. The specific steps are as follows:

[0013] 1) First, insert the sample cylinder into the moving groove body. The molding sand flows into the sample cylinder after being filtered by the filter screen, and the sample cylinder is filled with the molding sand.

[0014] 2) The electric push rod drives the inclined push block to level the piled-up molding sand. Then, the driving motor drives the lead screw to bring the sample cylinder below the pressing piston. The telescopic cylinder drives the pressing piston to press the molding sand tightly in the sample cylinder.

[0015] 3) Take out the sample cylinder filled with compacted molding sand, place it upside down on the sample seat, put the outer cover on the outside of the sample seat, and transfer the humidity inside the outer cover to the PLC controller through the humidity sensor;

[0016] 4) The PLC controller compares the value transmitted back by the humidity sensor with the set value, and adjusts it through the humidifying device and the dehumidifier to adjust the humidity inside the outer cover to the set value;

[0017] 5) Inflate the gas into the gas collecting box through the air pump. The gas pressure sensor collects the air pressure in the air sampling box in real time. When the air pressure reaches the preset value, open the solenoid valve to relieve the pressure, and start timing at the same time. When the gas collecting box reaches the preset value, record the time consumed. The PLC controller processes it, calculates the permeability of the molding sand, and displays the value through the display screen.

[0018] Beneficial effects

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] For a method and device for measuring the permeability of molding sand of the present invention, first insert the sample cylinder into the moving tank body. The molding sand flows into the sample cylinder after being filtered by the filter screen. The molding sand fills the sample cylinder. The filter screen plays a role in filtering, effectively filtering the large-particle molding sand to prevent unqualified molding sand from affecting the measurement results. Then the electric push rod drives the inclined push block to level the piled-up molding sand. The quantitative molding sand ensures the consistency of the detection. Then the driving motor drives the lead screw to bring the sample cylinder under the pressing piston. The telescopic cylinder drives the pressing piston to press the molding sand tightly in the sample cylinder. Immediately afterwards, take out the sample cylinder filled with compacted molding sand, place it upside down on the sample seat, put the outer cover on the outside of the sample seat, and transfer the humidity inside the outer cover to the PLC controller through the humidity sensor. The PLC controller compares the value transmitted back by the humidity sensor with the set value, and adjusts it through the humidifying device and the dehumidifier to adjust the humidity inside the outer cover to the set value, so as to ensure that when the air permeability experiment is carried out, the surrounding humidity is within the standard range, reduce the influence of humidity on the molding sand, and ensure the accuracy of the measurement. Inflate the gas into the gas collecting box through the air pump. The gas pressure sensor collects the air pressure in the gas collecting box in real time. When the air pressure reaches the preset value, open the solenoid valve to relieve the pressure, and start timing at the same time. When the gas collecting box reaches the preset value, record the time consumed. The PLC controller processes it, calculates the permeability of the molding sand, and displays the value through the display screen. The whole device can complete sample preparation and ventilation detection on site without taking it to the laboratory for detection, effectively shortening the detection cycle and improving production efficiency, and has the characteristics of convenient use and wide application range. Brief description of the drawings

[0021] Figure 1 It is the front view structural schematic diagram of the present invention;

[0022] Figure 2 For Figure 1 The enlarged schematic diagram of the structure at position A in

[0023] Wherein: 1 - measuring work box, 2 - feeding device, 3 - pressing device, 4 - pressing device, 5 - detection component, 6 - humidifying device, 7 - first support frame, 8 - second support frame, 9 - sample cylinder, 10 - moving tank body, 11 - sample seat, 12 - outer cover, 13 - humidity sensor, 14 - dehumidifier, 15 - PLC controller, 21 - funnel, 22 - filter screen, 23 - inclined push block, 24 - electric push rod, 31 - telescopic cylinder, 32 - pressing piston, 41 - guide rod, 42 - lead screw, 43 - drive motor, 51 - solenoid valve, 52 - air delivery pipe, 53 - gas pressure sensor, 54 - air pump, 55 - gas collecting box, 61 - nozzle, 62 - spray pipe, 63 - atomizer, 64 - water storage tank. Specific embodiments

[0024] The present invention will be further described below with reference to specific embodiments in the accompanying drawings.

[0025] Refer to Figure 1-2As shown in the figure, a device for measuring the permeability of molding sand according to the present invention includes a measurement working box 1. On one side of the top of the measurement working box 1, there is a first support frame 7. An upper feeding device 2 is arranged on the first support frame 7. On one side of the first support frame 7, there is a second support frame 8. A pressing device 3 is arranged on the second support frame 8. A moving groove body 10 is arranged between the first support frame 7 and the second support frame 8. A sample cylinder 9 is movably inserted into the moving groove body 10. A driving assembly 4 for driving the movement of the moving groove body 10 is arranged on the measurement working box 1. On the other side of the top of the measurement working box 1, there is a sample seat 11 for placing the sample cylinder 9. An outer cover 12 is arranged outside the sample seat 11. A humidity sensor 13 is arranged on the outer cover 12. A detection assembly 5 for detecting the permeability of the molding sand is arranged inside the measurement working box 1. The air outlet end of the detection assembly 5 is communicated with the sample seat 11. A humidity control assembly for controlling the humidity is arranged outside the sample seat 11. A PLC controller 15 with a display screen is arranged on the measurement working box 1. First, insert the sample cylinder 9 into the moving groove body 10. The molding sand flows into the sample cylinder 9 after being filtered by the filter screen 22. Fill the sample cylinder 9 with the molding sand. The filter screen 22 plays a role in filtering, effectively filtering out the large-particle molding sand and preventing unqualified molding sand from affecting the measurement results. Then, the electric push rod 24 pushes the inclined push block 23 to level the piled-up molding sand. The quantitative molding sand ensures the consistency of the detection. Then, drive the screw rod 42 by the drive motor 43 to bring the sample cylinder 9 below the pressing piston 32. Drive the pressing piston 32 through the telescopic cylinder 31 to press the molding sand tightly in the sample cylinder 9. Immediately take out the sample cylinder 9 with the pressed molding sand, place it upside down on the sample seat 11, put the outer cover 12 on the outside of the sample seat 11. The humidity sensor 13 transmits the humidity inside the outer cover 12 to the PLC controller 15. The PLC controller 15 compares the value transmitted back by the humidity sensor 13 with the set value and adjusts through the humidifying device 6 and the dehumidifier 14 to adjust the humidity inside the outer cover 12 to the set value, so as to ensure that when performing the permeability experiment, the surrounding humidity is within the standard range, reduce the influence of humidity on the molding sand, and ensure the accuracy of the measurement. Inflate the gas collecting box 55 through the air pump 54. The gas pressure sensor 53 continuously measures the air pressure inside the gas collecting box 55. When the air pressure reaches the preset value, open the solenoid valve 51 for pressure relief and start timing at the same time. When the gas collecting box 55 reaches the preset value, record the consumed time. The PLC controller 15 processes it, calculates the permeability of the molding sand, and displays the value through the display screen. The whole device can complete sample preparation and ventilation detection on site without taking it to the laboratory for detection, effectively shortening the detection cycle and improving production efficiency.

[0026] Specifically, the feeding device 2 includes a funnel 21, a filter screen 22, an electric push rod 24 and an inclined push block 23. The funnel 21 is installed on the first support frame 7, the filter screen 22 is arranged inside the funnel 21, the electric push rod 24 is vertically installed on the first support frame 7, the inclined push block 23 is connected to the output end of the electric push rod 24, and the bottom of the inclined push block 23 is flush with the top of the sample cylinder 9. The filter screen 22 plays a role in filtering, effectively filtering out large-particle molding sand and preventing unqualified molding sand from affecting the measurement results.

[0027] Preferably, the pressing device 3 includes a telescopic cylinder 31 and a pressing piston 32. The telescopic cylinder 31 is installed on the second support frame 8, the output end of the telescopic cylinder 31 is connected to the pressing piston 32, and the electric push rod 24 pushes the inclined push block 23 to level the piled-up molding sand, and the quantitative molding sand ensures the consistency of the detection.

[0028] Further, the driving assembly 4 includes a driving motor 43, a lead screw 42 and a guide rod 41. The driving motor 43 is installed on the measurement work box 1, one end of the lead screw 42 is connected to the driving motor 43, and the other end is rotatably connected to the first support frame 7. One end of the guide rod 41 is fixedly connected to the first support frame 7. The moving groove body 10 is movably inserted into the guide rod 41, and the moving groove body 10 is threadedly connected to the lead screw 42. By driving the lead screw 42 with the driving motor 43, the sample cylinder 9 is brought below the pressing piston 32, so as to perform the next pressing operation.

[0029] Further, the detection assembly 5 includes an air pump 54, a gas collection box 55, a gas pressure sensor 53, a solenoid valve 51 and an air delivery pipe 52. The air pump 54 is installed inside the measurement work box 1, the air pump 54 is communicated with the gas collection box 55, the gas collection box 55 is communicated with the sample seat 11 through the air delivery pipe 52, the solenoid valve 51 is installed on the air delivery pipe 52, the gas pressure sensor 53 is installed on the gas collection box 55, and the gas pressure sensor 53 and the solenoid valve 51 are both electrically connected to the PLC controller 15. The air pump 54 is used to inflate the gas collection box 55, the gas pressure sensor 53 continuously measures the air pressure inside the gas collection box 55. When the air pressure reaches the preset value, the solenoid valve 51 is opened for pressure relief, and at the same time, the timing starts. When the gas collection box 55 reaches the preset value, the consumed time is recorded, and the PLC controller 15 processes it to calculate the permeability of the molding sand.

[0030] Furthermore, the humidity control component includes a humidifying device 6 and a dehumidifier 14. The humidifying device 6 and the dehumidifier 14 are both arranged in the measurement working box 1. The humidifying device 6 and the dehumidifier 14 are internally communicated with the outer cover 12. The humidifying device 6 includes a water storage tank 64, an atomizer 63, a spray pipe 62 and a plurality of nozzles 61. The water storage tank 64 is installed in the measurement working box 1. The input end of the atomizer 63 is communicated with the water storage tank 64, and the output end of the atomizer 63 is communicated with the spray pipe 62. The spray pipe 62 is arranged on the inner wall of the outer cover 12, and the nozzles 61 are installed on the spray pipe 62. When the humidity sensor 13 detects that the humidity in the outer cover 12 is lower than the set value, the atomizer 63 pumps water from the water storage tank 64 for atomization, and after atomization, it is conveyed to the spray pipe 62 through a hose and sprayed out through the nozzles 61, thereby performing humidification. When the humidity sensor 13 detects that the humidity in the outer cover 12 is higher than the set value, the dehumidifier 14 is started to dehumidify the inside of the outer cover 12, and the humidity inside the outer cover 12 is adjusted to the set value, so as to ensure that when the air permeability experiment is carried out, the surrounding humidity is within the standard range, reduce the influence of humidity on the molding sand, and ensure the accuracy of the measurement.

[0031] A method for measuring the air permeability of molding sand uses the above-mentioned measuring device to measure the air permeability of molding sand. The specific steps are as follows:

[0032] 1. First, insert the sample cylinder 9 into the moving groove body 10. The molding sand flows into the sample cylinder 9 after being filtered by the filter screen 22, and the sample cylinder 9 is filled with the molding sand.

[0033] 2. The electric push rod 24 pushes the inclined push block 23 to level the piled-up molding sand. Then, the driving motor 43 drives the lead screw 42 to bring the sample cylinder 9 under the pressing piston 32, and the pressing piston 32 is driven by the telescopic cylinder 31 to press the molding sand tightly in the sample cylinder 9.

[0034] 3. Take out the sample cylinder 9 with the pressed molding sand, place it upside down on the sample seat 11, put the outer cover 12 on the outside of the sample seat 11, and the humidity sensor 13 transmits the humidity inside the outer cover 12 to the PLC controller 15.

[0035] 4. The PLC controller 15 compares the value transmitted back by the humidity sensor 13 with the set value, and adjusts it through the humidifying device 6 and the dehumidifier 14 to adjust the humidity inside the outer cover 12 to the set value.

[0036] 5. Inflate the gas collecting box 55 through the air pump 54. The gas pressure sensor 53 collects the air pressure inside the gas collecting box 55 in real time. When the air pressure reaches the preset value, open the solenoid valve 51 for pressure relief, and start timing at the same time. When the gas collecting box 55 reaches the preset value, record the consumed time. The PLC controller 15 processes it, calculates the air permeability rate of the molding sand, and displays the value through the display screen.

[0037] In this example, the humidifying device 6 and the dehumidifier 14 are used to adjust the humidity inside the outer cover 12 to a set value, so as to ensure that when the air permeability test is carried out, the surrounding humidity is within the standard range, reduce the influence of humidity on the molding sand, ensure the accuracy of measurement, and the humidifying device 6 and the dehumidifier 14 are adjusted to adjust the humidity inside the outer cover 12 to a set value, so as to ensure that when the air permeability test is carried out, the surrounding humidity is within the standard range, reduce the influence of humidity on the molding sand, and ensure the accuracy of measurement.

[0038] The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A device for measuring the permeability of molding sand, characterized in that, It includes a measurement work box (1). On one side of the top of the measurement work box (1), there is a first support frame (7). An upper feeding device (2) is arranged on the first support frame (7). On one side of the first support frame (7), there is a second support frame (8). A pressing device (3) is arranged on the second support frame (8). A moving groove body (10) is arranged between the first support frame (7) and the second support frame (8). A sample cylinder (9) is movably inserted into the moving groove body (10). A driving component (4) for driving the moving groove body (10) to move is arranged on the measurement work box (1). On the other side of the top of the measurement work box (1), there is a sample seat (11) for placing the sample cylinder (9). An outer cover (12) is arranged outside the sample seat (11). A humidity sensor (13) is arranged on the outer cover (12). A detection component (5) for detecting the permeability of molding sand is arranged in the measurement work box (1). The air outlet end of the detection component (5) is communicated with the sample seat (11). A humidity control component for controlling humidity is arranged outside the sample seat (11). A PLC controller (15) with a display screen is arranged on the measurement work box (1).

2. The measuring device for the permeability of green sand according to claim 1, wherein, The upper feeding device (2) includes a funnel (21), a filter screen (22), an electric push rod (24) and an inclined push block (23). The funnel (21) is installed on the first support frame (7). The filter screen (22) is arranged in the funnel (21). The electric push rod (24) is vertically installed on the first support frame (7). The inclined push block (23) is connected to the output end of the electric push rod (24). The bottom of the inclined push block (23) is flush with the top of the sample cylinder (9).

3. The measuring device for the permeability of molding sand according to claim 1, characterized in that, The pressing device (3) includes a telescopic cylinder (31) and a pressing piston (32). The telescopic cylinder (31) is installed on the second support frame (8). The output end of the telescopic cylinder (31) is connected to the pressing piston (32).

4. The measuring device for the permeability of molding sand according to claim 1, characterized in that, The driving component (4) includes a driving motor (43), a lead screw (42) and a guide rod (41). The driving motor (43) is installed on the measurement work box (1). One end of the lead screw (42) is connected to the driving motor (43), and the other end is rotatably connected to the first support frame (7). One end of the guide rod (41) is fixedly connected to the first support frame (7). The moving groove body (10) is movably inserted into the guide rod (41). The moving groove body (10) is threadedly connected to the lead screw (42).

5. The measuring device for the permeability of molding sand according to claim 1, characterized in that, The described detection component (5) includes an air pump (54), a gas collecting box (55), a gas pressure sensor (53), a solenoid valve (51) and an air delivery pipe (52). The air pump (54) is installed in the measurement working box (1). The air pump (54) is communicated with the gas collecting box (55). The gas collecting box (55) is communicated with the specimen seat (11) through the air delivery pipe (52). The solenoid valve (51) is installed on the air delivery pipe (52). The gas pressure sensor (53) is installed on the gas collecting box (55). The gas pressure sensor (53) and the solenoid valve (51) are both electrically connected to the PLC controller (15).

6. The measuring device for the permeability of molding sand according to claim 1, characterized in that, The described humidity control component includes a humidifying device (6) and a dehumidifier (14). The humidifying device (6) and the dehumidifier (14) are both arranged in the measurement working box (1). The humidifying device (6) and the dehumidifier (14) are communicated with the inside of the outer cover (12).

7. The measuring device for the permeability of molding sand according to claim 6, characterized in that, The described humidifying device (6) includes a water storage tank (64), an atomizer (63), a spray pipe (62) and a plurality of nozzles (61). The water storage tank (64) is installed in the measurement working box (1). The input end of the atomizer (63) is communicated with the water storage tank (64). The output end of the atomizer (63) is communicated with the spray pipe (62). The spray pipe (62) is arranged on the inner wall of the outer cover (12). The nozzles (61) are installed on the spray pipe (62).

8. A method for measuring the permeability of molding sand, characterized in that, Use the above-mentioned measuring device to measure the permeability of molding sand. The specific steps are as follows: 1) First, insert the specimen cylinder (9) into the moving trough (10). The molding sand flows into the specimen cylinder (9) after being filtered by the filter screen (22), and the specimen cylinder (9) is filled with the molding sand. 2) The electric push rod (24) pushes the inclined push block (23) to level the piled-up molding sand. Then, the driving motor (43) drives the lead screw (42) to bring the specimen cylinder (9) below the pressing piston (32). The pressing piston (32) is driven by the telescopic cylinder (31) to press the molding sand tightly in the specimen cylinder (9). 3) Take out the specimen cylinder (9) with the pressed molding sand, place it upside down on the specimen seat (11), put the outer cover (12) on the outside of the specimen seat (11), and the humidity sensor (13) transmits the humidity inside the outer cover (12) to the PLC controller (15). 4) The PLC controller (15) compares the value transmitted back by the humidity sensor (13) with the set value, and adjusts through the humidifying device (6) and the dehumidifier (14) to adjust the humidity inside the outer cover (12) to the set value. 5) Inflate into the gas collecting box (55) through the air pump (54). The gas pressure sensor (53) collects the air pressure in the gas collecting box (55) in real time. When the air pressure reaches the preset value, open the solenoid valve (51) to release the pressure, and start timing at the same time. When the gas collecting box (55) reaches the preset value, record the consumed time. The PLC controller (15) processes it, calculates the permeability of the molding sand, and displays the value through the display screen.

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