A device and method for measuring fluidity of coated sand

Abstract

The present invention discloses a device and method for measuring the fluidity of coated sand, and relates to the technical field of coated sand performance testing. It aims at the technical problem that coated sand is easily blocked at the outlet when flowing. A device for measuring the fluidity of coated sand comprises a frame, a storage box is fixedly connected to the frame, a first sliding frame is slidably connected to the frame, a symmetrically distributed first spring is fixedly connected between the frame and the first sliding frame, a hose is connected between the first sliding frame and the storage box, a first sliding block is slidably connected to the storage box, a pressing rod is fixedly connected to the first sliding block, the pressing rod is fixedly connected to the first sliding frame, and the first sliding block is fixedly connected to a first contact switch. In the present invention, when the coated sand starts to flow, a manually controlled timer starts timing, and when the coated sand flows out, the timer is automatically closed by controlling the first contact switch. In this way, the time when the coated sand completely flows out can be obtained, so as to detect the fluidity performance of the coated sand. The shorter the outflow time, the better the fluidity performance, and the detection operation is simple and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of coated sand performance testing, and in particular to a device and method for measuring the fluidity of coated sand. Background Art

[0002] Coated sand with good fluidity can fill every corner and complex part of the mold more evenly, reducing casting defects caused by sand flow or insufficient filling, such as cold shut, insufficient pouring, air holes, etc. Therefore, during the casting process, in order to ensure the quality of the casting and the smooth production process, engineers need to measure the fluidity of the coated sand.

[0003] At present, the flowability test of coated sand is usually carried out quantitatively by using the flow cup test, which measures the time (in seconds) required for the coated sand to flow out of the standard flow cup to reflect its fluidity. However, when the coated sand flows out of the flow cup outlet, due to the small diameter of the flow cup outlet, the coated sand is easily blocked at the outlet, affecting the smooth outflow of the coated sand, thereby affecting the subsequent fluidity measurement of the coated sand.

[0004] In order to solve the above problems, the present invention proposes a device and method for measuring the fluidity of coated sand with a dredging function. Summary of the invention

[0005] In order to overcome the shortcoming that coated sand is blocked at the outlet when flowing, the present invention provides a device and method for measuring the fluidity of coated sand with a dredging function.

[0006] The cam is connected to the storage box via a first spring, the first spring being connected to the storage box via a cam and the second spring being connected to the storage box via a first spring.

[0007] Furthermore, a device for measuring fluidity of coated sand also includes a counter, wherein the counter is fixed to the frame, and the second contact switch is electrically connected to the counter.

[0008] Further, the driving assembly includes a second rotating rod, the second rotating rod is rotatably connected to the storage box, the second rotating rod is rotatably connected to a second connecting rod, the second connecting rod is rotatably connected to a second sliding block, the second sliding block is slidably connected to the storage box, the second contact switch is in contact and cooperates with the second sliding block, a second spring is fixed between the second sliding block and the storage box, and a third connecting rod is rotatably connected between the second sliding block and the first connecting rod.

[0009] Furthermore, a coated sand fluidity measuring device also includes a U-shaped guide rail, the U-shaped guide rail is fixed to the frame, the U-shaped guide rail is fixed with symmetrically distributed rodless cylinders, the rodless cylinders are electrically connected to the timer through a control module, and a pusher frame is fixed between the symmetrically distributed moving parts of the rodless cylinders.

[0010] Furthermore, a coated sand fluidity measuring device also includes symmetrically distributed second fixed rods, the symmetrically distributed second fixed rods are all fixed to the frame, the frame is slidably connected to the second sliding frame, the pushing frame is fixed to the symmetrically distributed first fixed rods, the second sliding frame is fixed to the symmetrically distributed convex rods, the first fixed rod cooperates with the adjacent convex rods, and symmetrically distributed third springs are fixed between the second sliding frame and the frame.

[0011] Furthermore, a coated sand fluidity measuring device also includes a third rotating rod, the third rotating rod is rotatably connected to the second fixed rod, the third rotating rod is movably connected to the blanking plate, and the third rotating rod is movably connected to the second sliding frame.

[0012] Furthermore, a device for measuring the fluidity of coated sand also includes a motor, which is fixed to the frame, the storage box is rotatably connected to a roller shaft, a conveyor belt is connected between the output shaft of the motor and the roller shaft, and the conveyor belt is fixed with evenly distributed partitions, and the partitions are set to a soft rubber material.

[0013] Furthermore, a device for measuring fluidity of coated sand also includes a third fixing rod, the third fixing rod is fixed to the storage box, and the third fixing rod is squeezed and matched with the partition of the conveyor belt.

[0014] Furthermore, a device for measuring fluidity of coated sand also includes a filter, and the filter is fixedly connected to the storage box.

[0015] Furthermore, a method for measuring the fluidity of coated sand comprises the following steps:

[0016] S1: pouring coated sand from above the frame, and the coated sand is accumulated above the unloading plate until the top of the coated sand is level with the frame;

[0017] S2: Manually and quickly pull open the blanking plate and manually control the timer to start, and the timer starts timing when the coated sand flows into the storage box;

[0018] S3: When the second sliding block slides upward, the first rotating rod rotates backward and upward to clear the blocked part of the coated sand;

[0019] S4: When all the coated sand flows into the storage box, the first contact switch automatically moves upward to contact the storage box, and the first contact switch controls the timer to automatically turn off, and the timer stops timing.

[0020] The beneficial effects are: 1. When the coated sand starts to flow, the manually controlled timer starts timing, and when the coated sand has finished flowing, the timer is automatically closed through the first contact switch. In this way, the time when the coated sand completely flows out can be obtained, thereby detecting the flow performance of the coated sand. The shorter the flow time, the better the flow performance, and the detection operation is simple and convenient.

[0021] 2. The present invention enables the counter to count by sliding the second sliding block upward to contact the second contact switch, and then subtracts one from the actual count of the counter to obtain the number of times the coated sand is blocked during the flow process. The flow performance of the coated sand is then comprehensively judged based on the number of times the coated sand is blocked. The more times the coated sand is blocked, the worse the flow performance.

[0022] 3. In the present invention, after the coated sand is blocked, the second sliding block slides upward through the third connecting rod and the first connecting rod to drive the first rotating rod to rotate backward and upward to reset. In this way, the first rotating rod can clear the blocked part to avoid affecting the subsequent fluidity detection.

[0023] 4. When the manual control timer is started, the top of the coated sand is pushed forward and backward by the pushing frame, so that the excess coated sand is pushed to the front side of the upper part of the frame, ensuring that the test amount of the coated sand is the same each time, reducing the error of the test result.

[0024] 5. The present invention drives the conveyor belt by a motor to transfer the coated sand in the storage box from the front side upward into the frame. In this way, the same batch of coated sand can be tested repeatedly to avoid errors in one test and improve the accuracy of the test.

[0025] 6. In the present invention, the partition on the conveyor belt contacts the third fixed rod. Under the squeezing effect of the third fixed rod, the partition tilts forward and downward, so that the coated sand can be tilted to fall to the upper part of the storage box better, and then fall downward along the upper part of the storage box into the frame, avoiding the coated sand from falling straight down to the lower part of the storage box.

[0026] 7. The coated sand of the present invention will pass through the filter when it falls from the upper part of the storage box to the frame. The filter can filter out the coated sand with unqualified particles and also prevent the coated sand from agglomerating. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the present invention.

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the rack, storage box, first sliding rack and other components of the present invention.

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the frame of the present invention.

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the hose, the pressing rod, the first sliding block and other components of the present invention.

[0032] Figure 6 It is a schematic diagram of the three-dimensional structure of the second contact switch, the first connecting rod and other components of the present invention.

[0033] Figure 7 It is a schematic diagram of the three-dimensional structure of the second rotating rod, the second sliding block and other components of the present invention.

[0034] Figure 8 It is a schematic diagram of the three-dimensional structure of the rodless cylinder, U-shaped guide rail, pusher frame and other components of the present invention.

[0035] Fig. 9 It is a schematic diagram of the three-dimensional structure of the second fixing rod, the third spring and other components of the present invention.

[0036] Fig.10 It is a schematic diagram of the three-dimensional structure of the third rotating rod, blanking plate and other components of the present invention.

[0037] Fig.11 It is a schematic diagram of the three-dimensional structure of the motor, roller shaft, conveyor belt and other components of the present invention.

[0038] Fig.12 It is a schematic diagram of the three-dimensional structure of the filter and other components of the present invention.

[0039] Description of reference numerals: 101, frame, 102, storage box, 103, first sliding frame, 104, first spring, 105, hose, 106, pressing rod, 107, first sliding block, 108, first contact switch, 109, second contact switch, 110, timer, 111, first rotating rod, 112, first connecting rod, 113, counter, 114, blanking plate, 201, second rotating rod, 202, second connecting rod, 203, second sliding block, 204, second spring, 205, third connecting rod, 301, rodless cylinder, 302, U-shaped guide rail, 303, push frame, 401, second fixed rod, 402, second sliding frame, 403, third spring, 404, third rotating rod, 405, first fixed rod, 406, protruding rod, 501, motor, 502, roller shaft, 503, conveyor belt, 504, third fixed rod, 601, filter. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0041] Embodiment 1: A device for measuring the fluidity of coated sand, such as Figure 1-Figure 6 As shown, it includes a frame 101, a storage box 102 is fixedly connected to the middle of the rear part of the frame 101, a first sliding frame 103 is slidably connected to the upper front side of the frame 101, and the first sliding frame 103 is set to a funnel shape. The front and rear sides between the frame 101 and the first sliding frame 103 are fixedly connected with first springs 104 that are symmetrically distributed on the left and right. A hose 105 is connected between the bottom of the first sliding frame 103 and the top of the front side of the storage box 102. A first sliding block 107 is slidably connected to the upper front part of the storage box 102, a pressing rod 106 is fixedly connected to the upper front part of the first sliding block 107, the top of the pressing rod 106 is fixedly connected to the first sliding frame 103, and the top of the first sliding block 107 is fixedly connected to the first contact switch 108. The switch 108 contacts and cooperates with the storage box 102, the second contact switch 109 is fixedly connected to the bottom of the first sliding block 107, the timer 110 is fixedly connected to the upper front part of the storage box 102, the first contact switch 108 is electrically connected to the timer 110, the first rotating rod 111 is rotatably connected to the upper inner part of the storage box 102 for clearing the blocked coated sand, the first rotating rod 111 is rotatably connected to the first connecting rod 112 at the right end, a counter 113 is fixedly connected to the upper right side of the frame 101, the second contact switch 109 is electrically connected to the counter 113, a blanking plate 114 is slidably connected to the upper inner part of the storage box 102, and the storage box 102 is provided with a driving component for driving the first connecting rod 112 to rotate so as to drive the first rotating rod 111 to rotate.

[0042] like Figure 7As shown, the driving assembly includes a second rotating rod 201, which is connected to the upper part of the storage box 102 by rotating up and down, the front of the second rotating rod 201 is connected to the second connecting rod 202 by rotation, the lower part of the second connecting rod 202 is connected to the second sliding block 203 by rotation, the second sliding block 203 is connected to the storage box 102 by sliding up and down, the second contact switch 109 is in contact with the second sliding block 203, a second spring 204 is fixed between the second sliding block 203 and the storage box 102, and a third connecting rod 205 is connected to the right side of the second sliding block 203 by rotation.

[0043] First, people pour the coated sand from the top of the frame 101, and the coated sand falls on the unloading plate 114 along the frame 101, the first sliding frame 103 and the hose 105, and accumulates on the unloading plate 114. As the amount of coated sand increases, the gravity of the coated sand causes the first sliding frame 103 to slide downward, the first spring 104 is compressed, the first sliding frame 103 drives the pressing rod 106 to move downward, the pressing rod 106 drives the first sliding block 107 to slide downward, thereby driving the first contact switch 108 to move downward to disengage the storage box 102, and driving the second contact switch 109 to move downward to contact the second sliding block 203. At this time, the second contact switch 109 controls the counter 113 to count once.

[0044] When the coated sand increases to the top and is level with the frame 101, people then quickly pull the unloading plate 114 backwards and manually control the timer 110 to start, so that the timer 110 starts timing when the coated sand flows into the storage box 102. In the process of the coated sand flowing downward, the coated sand drives the second rotating rod 201 to rotate downward, and the second rotating rod 201 drives the second sliding block 203 to slide downward and disengage from the second contact switch 109 through the second connecting rod 202, and the second spring 204 is stretched, and the second sliding block 203 drives the first rotating rod 111 to rotate forward and downward through the third connecting rod 205 and the first connecting rod 112 to store force;

[0045] During the flow of the coated sand, if the fluidity of some of the coated sand is poor, resulting in the coated sand being blocked at the position of the unloading plate 114, the coated sand temporarily flows downward, so that the second rotating rod 201 is no longer subjected to the pressure of the coated sand when it is blocked, and the second spring 204 is reset to drive the second sliding block 203 to slide upward and contact the second contact switch 109. At this time, the counter 113 starts to count once, so that the number of times the coated sand is blocked during the flow process can be obtained based on the actual count of the counter 113 minus one, and the flow performance of the coated sand can be comprehensively judged in combination with the number of times the coated sand is blocked. The more times it is blocked, the worse the flow performance is. The second sliding block 203 slides upward through the second connecting rod 202 to drive the second rotating rod 201 to rotate upward and reset. At the same time, the second sliding block 203 slides upward through the third connecting rod 205 and the first connecting rod 112 to drive the first rotating rod 111 to rotate backward and upward and reset. In this way, the first rotating rod 111 can dredge the blocked part to avoid affecting the subsequent fluidity detection;

[0046] When all the coated sand above the unloading plate 114 flows into the storage box 102, the first spring 104 resets and drives the first sliding frame 103 to slide upward and reset, the first sliding frame 103 drives the pressing rod 106 to move upward, the pressing rod 106 drives the first sliding block 107 to slide upward, thereby driving the first contact switch 108 to move upward and contact the storage box 102, and driving the second contact switch 109 to move upward and disengage from the second sliding block 203. At this time, the first contact switch 108 controls the timer 110 to automatically turn off. In this way, the present invention detects the flowability of the coated sand according to the time it takes for the same amount of coated sand to completely flow out. The shorter the flow time, the better the flowability, and the operation is simple and convenient.

[0047] like Figure 8 As shown, a device for measuring the fluidity of coated sand also includes a U-shaped guide rail 302, which is fixed to the top of a frame 101, and the U-shaped guide rail 302 is fixed with rodless cylinders 301 that are symmetrically distributed on the left and right, and the rodless cylinders 301 are electrically connected to a timer 110 through a control module, and a pushing frame 303 for flattening the top of the coated sand is fixed between the moving parts of the rodless cylinders 301 that are symmetrically distributed on the left and right, to ensure that the test amount of the coated sand is the same each time.

[0048] When the manual control timer 110 is started, the rodless cylinder 301 is started at the same time, and the rodless cylinder 301 drives the pushing frame 303 to slide forward and backward along the U-shaped guide rail 302. The pushing frame 303 pushes the top of the coated sand forward and backward, and the excess coated sand is pushed to the upper front side of the frame 101, ensuring that the test amount of the coated sand is the same each time, reducing the error of the test result, and when the first contact switch 108 controls the timer 110 to automatically close, the rodless cylinder 301 is closed at the same time.

[0049] like Figure 9-10As shown, a coated sand fluidity measuring device also includes a second fixed rod 401 symmetrically distributed on the left and right, the second fixed rod 401 symmetrically distributed on the left and right are respectively fixedly connected to the left and right sides of the upper part of the frame 101, the upper part of the frame 101 is slidably connected with a U-shaped second sliding frame 402, the pushing frame 303 is fixedly connected with a first fixed rod 405 symmetrically distributed on the left and right, the front part of the second sliding frame 402 is fixedly connected with a convex rod 406 symmetrically distributed on the left and right, the first fixed rod 405 cooperates with the adjacent convex rod 406, the third spring 403 symmetrically distributed on the left and right is fixedly connected between the second sliding frame 402 and the frame 101, the lower part of the second fixed rod 401 is rotatably connected with a third rotating rod 404, the third rotating rod 404 is movably connected to the unloading plate 114, and the third rotating rod 404 is movably connected to the second sliding frame 402.

[0050] When the pusher frame 303 slides forward, the pusher frame 303 drives the first fixed rod 405 to move forward and contact the protruding rod 406, and drives the second sliding frame 402 to slide forward through the protruding rod 406, the third spring 403 is compressed, and the second sliding frame 402 drives the unloading plate 114 to slide backward automatically through the third rotating rod 404, so that when the pusher frame 303 pushes the coated sand forward to flatten the unloading plate 114, the unloading plate 114 can be automatically opened without manual opening;

[0051] When the push frame 303 slides backward, the push frame 303 drives the first fixed rod 405 to move backward and disengage from the protruding rod 406, and the third spring 403 gradually resets to drive the second sliding frame 402 to slide backward, thereby driving the protruding rod 406 to move backward and reset, and the second sliding frame 402 drives the unloading plate 114 to automatically slide forward and reset through the third rotating rod 404.

[0052] like Fig.11 As shown, a coated sand fluidity measuring device also includes a motor 501, which is fixedly connected to the lower rear side of the frame 101, and a roller 502 is rotatably connected to the upper rear side of the storage box 102. A conveyor belt 503 is connected between the output shaft of the motor 501 and the roller 502, and the conveyor belt 503 is fixedly connected with evenly distributed partitions, and the partitions are set to be soft rubber material. The storage box 102 is fixedly connected with a third fixed rod 504, and the third fixed rod 504 is squeezed and matched with the partitions of the conveyor belt 503.

[0053] In order to avoid errors in a single detection, it is necessary to repeat multiple detections on the same batch of coated sand. Therefore, it is necessary to return the coated sand flowing into the storage box 102 upward into the frame 101. The specific operations are as follows: start the motor 501, and the output shaft of the motor 501 drives the roller 502 to rotate through the conveyor belt 503. When the partition on the conveyor belt 503 contacts the third fixed rod 504, the partition is squeezed by the third fixed rod 504 and tilts forward and downward, so that the coated sand can better tilt and fall to the upper part of the storage box 102, and then tilt downward along the upper part of the storage box 102 and fall into the frame 101, so as to prevent the coated sand from falling straight down back to the lower part of the storage box 102. After the recovery is completed, turn off the motor 501.

[0054] like Fig.12 As shown, a device for measuring fluidity of coated sand further includes a filter 601 , and the filter 601 is fixedly connected to the upper front side of the storage box 102 .

[0055] The coated sand will pass through the filter 601 when it falls from the upper part of the storage box 102 to the frame 101. The filter 601 can filter out the coated sand with unqualified particles and prevent the coated sand from agglomerating.

[0056] A method for measuring the fluidity of coated sand comprises the following steps:

[0057] S1: Pour the coated sand from above the frame 101, and the coated sand is accumulated above the blanking plate 114 until the top of the coated sand is level with the frame 101;

[0058] S2: Manually and quickly pull open the unloading plate 114 and manually control the timer 110 to start. When the coated sand flows into the storage box 102, the timer 110 starts timing;

[0059] S3: When the second sliding block 203 slides upward, the first rotating rod 111 rotates backward and upward to clear the blocked part of the coated sand;

[0060] S4: When all the coated sand flows into the storage box 102, the first contact switch 108 automatically moves upward to contact the storage box 102, and the first contact switch 108 controls the timer 110 to automatically turn off, and the timer 110 stops timing.

[0061] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring fluidity of coated sand, comprising a frame (101), wherein the frame (101) is fixedly connected to a storage box (102), wherein: The storage box (102) further comprises a first sliding frame (103), wherein the first sliding frame (103) is slidably connected to the frame (101), symmetrically distributed first springs (104) are fixedly connected between the frame (101) and the first sliding frame (103), a hose (105) is connected between the first sliding frame (103) and the storage box (102), and the storage box (102) is slidably connected to a first sliding block (107), the first sliding block (107) is fixedly connected to a pressing rod (106), the pressing rod (106) is fixedly connected to the first sliding frame (103), the first sliding block (107) is fixedly connected to a first contact switch (108), and the first contact switch (108) is fixedly connected to the storage box (102). 02) contact cooperation, the first sliding block (107) is fixedly connected to a second contact switch (109) on a side away from the first contact switch (108), the storage box (102) is fixedly connected to a timer (110), the first contact switch (108) is electrically connected to the timer (110), the storage box (102) is rotatably connected to a first rotating rod (111) for clearing blocked coated sand, the first rotating rod (111) is rotatably connected to a first connecting rod (112), the storage box (102) is slidably connected to a blanking plate (114), and the storage box (102) is provided with a driving component for driving the first connecting rod (112) to rotate, thereby driving the first rotating rod (111) to rotate; It also includes a counter (113), the counter (113) being fixedly connected to the frame (101), and the second contact switch (109) being electrically connected to the counter (113); The driving assembly comprises a second rotating rod (201), the second rotating rod (201) is rotatably connected to the storage box (102), the second rotating rod (201) is rotatably connected to a second connecting rod (202), the second connecting rod (202) is rotatably connected to a second sliding block (203), the second sliding block (203) is slidably connected to the storage box (102), the second contact switch (109) is in contact and cooperation with the second sliding block (203), a second spring (204) is fixedly connected between the second sliding block (203) and the storage box (102), and a third connecting rod (205) is rotatably connected between the second sliding block (203) and the first connecting rod (112).

2. A device for measuring fluidity of coated sand according to claim 1, characterized in that: It also includes a U-shaped guide rail (302), the U-shaped guide rail (302) is fixedly connected to the frame (101), the U-shaped guide rail (302) is fixedly connected to symmetrically distributed rodless cylinders (301), the rodless cylinders (301) are electrically connected to the timer (110) through a control module, and a pusher frame (303) is fixedly connected between the moving parts of the symmetrically distributed rodless cylinders (301).

3. A device for measuring fluidity of coated sand according to claim 2, characterized in that: It also includes symmetrically distributed second fixing rods (401), the symmetrically distributed second fixing rods (401) are all fixedly connected to the frame (101), the frame (101) is slidably connected to a second sliding frame (402), the pushing frame (303) is fixedly connected to symmetrically distributed first fixing rods (405), the second sliding frame (402) is fixedly connected to symmetrically distributed convex rods (406), the first fixing rods (405) cooperate with adjacent convex rods (406), and symmetrically distributed third springs (403) are fixedly connected between the second sliding frame (402) and the frame (101).

4. A device for measuring fluidity of coated sand according to claim 3, characterized in that: It also includes a third rotating rod (404), the third rotating rod (404) is rotatably connected to the second fixed rod (401), the third rotating rod (404) is movably connected to the blanking plate (114), and the third rotating rod (404) is movably connected to the second sliding frame (402).

5. A device for measuring fluidity of coated sand according to claim 4, characterized in that: It also includes a motor (501), the motor (501) is fixedly connected to the frame (101), the storage box (102) is rotatably connected to a roller shaft (502), a conveyor belt (503) is connected between the output shaft of the motor (501) and the roller shaft (502), and the conveyor belt (503) is fixedly connected to evenly distributed partitions, and the partitions are set to be made of soft rubber material.

6. A device for measuring fluidity of coated sand according to claim 5, characterized in that: It also includes a third fixing rod (504), the third fixing rod (504) being fixedly connected to the storage box (102), and the third fixing rod (504) being extruded and matched with the partition of the conveyor belt (503).

7. A device for measuring fluidity of coated sand according to claim 6, characterized in that: It also includes a filter (601), wherein the filter (601) is fixedly connected to the storage box (102).

8. A method for measuring the fluidity of coated sand, using a device for measuring the fluidity of coated sand according to any one of claims 1 to 7, characterized in that: The steps include: S1: pouring coated sand from above the frame (101), and the coated sand is accumulated above the unloading plate (114) until the top of the coated sand is flush with the frame (101); S2: manually and quickly pulling open the unloading plate (114) and manually controlling the timer (110) to start, so that the timer (110) starts timing when the coated sand flows into the storage box (102); S3: when the second sliding block (203) slides upward, the first rotating rod (111) rotates backward and upward to clear the blocked part of the coated sand; S4: When all the coated sand flows into the storage box (102), the first contact switch (108) automatically moves upward to contact the storage box (102), and the first contact switch (108) controls the timer (110) to automatically turn off, and the timer (110) stops timing.

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