Automatic flow control device of sand mixer

Abstract

The invention discloses an automatic flow control device of a sand mixer, and belongs to the technical field of sand mixer device.The automatic flow control device of the sand mixer comprises a main support, a material crushing assembly is arranged on the upper middle portion of the inner side of the main support, a flow control assembly is arranged in the middle of the inner side of the main support, and a material mixing assembly is arranged on the lower middle portion of the inner side of the main support; the material crushing assembly comprises a main material feeding assembly and an auxiliary material feeding assembly, and the flow control assembly comprises a main material quantity control assembly and an auxiliary material quantity control assembly. The sand mixing efficiency can be effectively improved, meanwhile, consumption of human resources is reduced, effective cleaning of the whole device is achieved, and the influence of residual sand in the device on use of the sand mixer is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sand mixer devices, and more specifically to an automatic flow control device for a sand mixer. Background Art

[0002] Sand mixer is a device that mixes the components of the molding sand evenly and effectively coats the surface of the sand particles with the binder. The sand mixer uses the relative movement of the grinding wheel and the grinding plate to crush the materials placed between the two by rolling and grinding. The sand mixer mixes the materials while crushing them. It is an ideal equipment for producing unburned bricks, lime sand bricks, cement bricks, refractory bricks, crushing and mixing fly ash, boiler slag, tailings and industrial waste residues as raw materials for brick making.

[0003] At present, when a sand mixer is performing sand mixing operations, a common sand mixer needs to put the main material and the auxiliary material of the sand into the mixture separately when in use. Before this, the main material and the auxiliary material of the sand need to be weighted separately, which will reduce the sand mixing efficiency of the sand mixer and consume more manpower. Moreover, after the sand mixing is completed, there will still be a certain amount of sand in the sand mixer, and these sands will accumulate inside the sand mixer. If they are not cleaned in time, it may affect the use effect of the sand mixer.

[0004] Therefore, in view of this, the existing structure is studied and improved, and an automatic flow control device for a sand mixer is provided, in order to achieve a more practical purpose. Summary of the invention

[0005] 1. Technical problems to be solved

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide an automatic flow control device for a sand mixer, which can effectively improve the efficiency of sand mixing, while reducing the consumption of human resources, achieving effective cleaning of the entire device, and effectively reducing the impact of residual sand inside the device on the use of the sand mixer.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] An automatic flow control device for a sand mixer comprises a main support, a crushing component is arranged at the middle and upper part of the inner side of the main support, a flow control component is arranged at the middle part of the inner side of the main support, and a mixing component is arranged at the middle and lower part of the inner side of the main support;

[0010] The crushing material assembly includes a main material feeding assembly and an auxiliary material feeding assembly, the main material feeding assembly includes a feeding funnel, a spray water pipe group is arranged directly above the feeding funnel, the water inlet end of the spray water pipe group is connected to a water guide pipe, one end of the water guide pipe is fixedly connected to a water pump, the water pump is fixedly installed on the inner bottom of the main bracket by bolts, a powder box is fixed at the bottom end of the feeding funnel, a crushing roller is movably connected to the inside of the powder box through a bearing, the central rotating shaft of the crushing roller extends to the outside of the feeding funnel, a reduction motor is fixedly installed on the outside of the powder box, the output shaft of the reduction motor is connected to a driving gear through a coupling, the driving gear is meshed with a driven gear, and the driving gear and the driven gear are respectively fixed to the central rotating shaft of the crushing roller at the corresponding position;

[0011] The flow control component includes a main material quantity control component and an auxiliary material quantity control component, the main material quantity control component includes a quantity control funnel, the top of the quantity control funnel is fixed to the bottom of the powder box, the top of the inner top of the quantity control funnel is fixedly installed with a screen, the outer side of the bottom end of the quantity control funnel is fixedly provided with a protective shell, and the pipeline of the quantity control funnel is fixedly installed with an electromagnetic flow valve, the electromagnetic flow valve is arranged inside the protective shell, the bottom end of the protective shell is fixedly installed with a discharge pipe, the inside of the discharge pipe is provided with a weighing flap, the outside of the discharge pipe is fixedly installed with a stepping motor, the output shaft of the stepping motor passes through the discharge pipe, and is fixed to the turning shaft of the weighing flap through a coupling;

[0012] The mixing assembly includes a mixing barrel, two feeding ports of the mixing barrel are respectively fixed to two discharge pipes, a discharge port is provided at the bottom end of the mixing barrel, a mixing drive motor is fixedly installed on the outside of the mixing barrel, an output shaft of the mixing drive motor passes through the mixing barrel, and is connected to a mixing shaft through a coupling.

[0013] Furthermore, rotating nozzles are fixedly installed at the several water outlet ports of the spray water pipe group, and the spray coverage area of ​​the rotating nozzles is larger than the opening cross-sectional area of ​​the powder box.

[0014] Furthermore, the feeding funnel is a sloped structure, and a protective plate is fixedly provided at the opening of the feeding funnel, and the length of the protective plate is half of the opening length of the feeding funnel.

[0015] Furthermore, four crushing rollers are arranged inside the powder box, and the four crushing rollers are arranged up and down in a quadrilateral. Two reduction motors are arranged outside the powder box, and the operating frequency and rotation amplitude of the two reduction motors are the same.

[0016] Furthermore, the channel width of the quantity control funnel is five times the aperture value of the sieve, and the channel length of the quantity control funnel is fifty times the aperture value of the sieve.

[0017] Furthermore, a vibration generator is fixedly installed inside the inner side wall of the quantity control funnel.

[0018] Furthermore, a pressure sensor is fixedly mounted on the weighing flap, and the sensing surface of the pressure sensor covers the entire upper end surface of the weighing flap.

[0019] Furthermore, the inner side surface of the discharge pipe is provided with an arc-shaped slide groove, and the side surface of the weighing flap is an arc-shaped surface.

[0020] Furthermore, a timing type solenoid valve is fixedly installed on the outer side surface of the discharge port.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] ① In this scheme, when the sand mixer performs sand mixing operation, the device is composed of a crushing component, a flow control component and a mixing component. The main material and the auxiliary material of the sand material are crushed in the corresponding crushing component, and the quantity control and weighting are completed in the corresponding flow control component. Then, the crushed and quantity controlled sand material can be mixed in the mixing component, and the crushing, quantity control and mixing can be carried out synchronously inside the device, so that the efficiency of sand mixing can be effectively improved, and at the same time, the consumption of human resources can be reduced;

[0024] ② In this solution, during the sand mixing process or at the end of the sand mixing, clean water is introduced into the spray water pipe group through the water pump and the water pipe, and then sprayed out by the rotating nozzle to complete the cleaning of the crushing roller. At the same time, since the entire device is an upper and lower structure, the cleaned water and sand can pass through the crushing component, the flow control component and the mixing component in turn, and finally be discharged, thereby achieving effective cleaning of the entire device and effectively reducing the impact of the residual sand inside the device on the use of the sand mixer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure after the bracket is removed in the present invention;

[0027] Figure 3 It is a schematic diagram of the plane structure in the present invention;

[0028] Figure 4 The three-dimensional structure of the crushing component in the present invention is shown in FIG. Figure 1 ;

[0029] Figure 5 The three-dimensional structure of the crushing component in the present invention is shown in FIG. Figure 2 ;

[0030] Figure 6 It is a schematic diagram of the three-dimensional structure of the flow control component in the present invention;

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the flow control component in the present invention after being disassembled;

[0032] Figure 8 It is a schematic diagram of the planar structure of the flow control component in the present invention after being disassembled;

[0033] Fig. 9 It is a schematic diagram of the three-dimensional structure of the mixing component in the present invention.

[0034] Description of the numbers in the figure:

[0035] 1. Main bracket;

[0036] 2. Crushed component;

[0037] 201, feeding funnel; 2011, protective plate;

[0038] 202, sprinkler pipe assembly; 2021, rotating sprinkler head;

[0039] 203, water pipe; 204, water pump; 205, powder box; 206, crushing roller; 207, reduction motor; 208, driving gear; 209, driven gear;

[0040] 3. Flow control components;

[0041] 301, quantity control funnel; 3011, vibration generator;

[0042] 302, screen; 303, protective shell; 304, electromagnetic flow valve;

[0043] 305, discharge pipe; 3051, arc chute;

[0044] 306, weighing flap; 3061, pressure sensor;

[0045] 307, stepper motor;

[0046] 4. Mixing components;

[0047] 401, mixing barrel;

[0048] 402, discharge port; 4021, timing type solenoid valve;

[0049] 403, mixing drive motor; 404, mixing shaft. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0051] Embodiment 1:

[0052] See also Figure 1 - Fig. 9 An automatic flow control device for a sand mixer comprises a main support 1, which is used to support the entire device and ensure that other structures except the main support 1 are in a suspended state, thereby facilitating operations such as loading and unloading.

[0053] A crushing assembly 2 is provided at the middle and upper part of the inner side of the main support 1, which is used for feeding, crushing and cleaning the main sand mixing material and the auxiliary sand mixing material.

[0054] The crushing component 2 includes a main material feeding component and an auxiliary material feeding component. The main material feeding component and the auxiliary material feeding component have the same structure and are symmetrically arranged. The main material enters the sand mixer from the main material feeding component and is crushed. The auxiliary material enters the sand mixer from the auxiliary material feeding component and is crushed. The working mode of the auxiliary material feeding component is the same as that of the main material feeding component.

[0055] The main material feeding assembly includes a feeding funnel 201 , and the main material enters from the opening of the feeding funnel 201 .

[0056] A spray water pipe group 202 is arranged directly above the feeding funnel 201, and the water inlet end of the spray water pipe group 202 is connected to a water guide pipe 203, one end of the water guide pipe 203 is fixedly connected to a water pump 204, the water pump 204 is fixedly installed on the inner bottom of the main bracket 1 by bolts, and is connected to an external water source through the water pump 204, and then the flushing water is guided to the spray water pipe group 202 by the water guide pipe 203 to complete the flushing and cleaning.

[0057] A powder box 205 is fixed at the bottom end of the feeding funnel 201. A crushing roller 206 is movably connected to the inside of the powder box 205 through a bearing. The central shaft of the crushing roller 206 extends to the outside of the feeding funnel 201. A reduction motor 207 is fixedly installed on the outside of the powder box 205. The output shaft of the reduction motor 207 is connected to a driving gear 208 through a coupling. The driving gear 208 is meshed with a driven gear 209. The driving gear 208 and the driven gear 209 are respectively fixed to the central shaft of the crushing roller 206 at the corresponding position. When the sand material reaches the powder box 205, the reduction motor 207 works and controls the driving gear 208 to rotate. At this time, the driven gear 209 rotates synchronously in the opposite direction, and then the corresponding two crushing rollers 206 rotate synchronously in the opposite direction to achieve the crushing of the sand material.

[0058] A flow control component 3 is provided in the middle of the inner side of the main support 1 to control the feeding of the main material or the auxiliary material.

[0059] The flow control component 3 includes a main material quantity control component and an auxiliary material quantity control component. The main material quantity control component and the auxiliary material quantity control component have the same structure and are symmetrically arranged. The main material enters from the main material quantity control component and completes quantity control and discharge. The auxiliary material enters from the auxiliary material quantity control component and completes quantity control and discharge. The working mode of the auxiliary material quantity control component is the same as that of the main material quantity control component.

[0060] The main material quantity control component includes a quantity control funnel 301, the top of the quantity control funnel 301 is fixed to the bottom of the powder box 205, and a sieve 302 is fixedly installed on the inner top of the quantity control funnel 301. When the crushed sand material reaches the sieve 302, the sand material with a qualified particle size after crushing passes through the sieve 302 and reaches the quantity control funnel 301, and the sand material with an unqualified particle size after crushing is retained above the sieve 302 and is continuously crushed with the rotation of the crushing roller 206 below until it passes through the sieve 302.

[0061] A protective shell 303 is fixedly provided on the outer side of the bottom end of the quantity control funnel 301, and an electromagnetic flow valve 304 is fixedly installed on the pipeline of the quantity control funnel 301. The electromagnetic flow valve 304 is arranged inside the protective shell 303. The protective shell 303 can protect the electromagnetic flow valve 304, and the electromagnetic flow valve 304 can control the amount of sand passing through the quantity control funnel 301.

[0062] A discharge pipe 305 is fixedly installed at the bottom end of the protective shell 303, and a weighing flap 306 is arranged inside the discharge pipe 305. A stepper motor 307 is fixedly installed outside the discharge pipe 305. The output shaft of the stepper motor 307 passes through the discharge pipe 305 and is fixed to the flip shaft of the weighing flap 306 through a coupling. The sand material passes through the quantity control funnel 301, reaches the weighing flap 306, and is weighed. When the weighing weight on the weighing flap 306 reaches a certain value, a signal is sent, and the electromagnetic flow valve 304 controls the quantity control funnel 301 to stop unloading, and then the stepper motor 307 controls the weighing flap 306 to flip and unload, and then return and re-weigh. At this time, the electromagnetic flow valve 304 is used to control the quantity control funnel 301 to unload again, so that the weight control of the unloading can be completed.

[0063] A mixing assembly 4 is provided at the lower middle portion of the inner side of the main support 1 for mixing the sand material after crushing and controlling the amount.

[0064] The mixing assembly 4 includes a mixing barrel 401, the two feeding ports of the mixing barrel 401 are respectively fixed to the two discharge pipes 305, the bottom end of the mixing barrel 401 is provided with a discharge port 402, the outside of the mixing barrel 401 is fixedly installed with a mixing drive motor 403, the output shaft of the mixing drive motor 403 passes through the mixing barrel 401, and is connected to a mixing shaft 404 through a coupling transmission. The mixing drive motor 403 controls the rotation of the mixing shaft 404, and the sand material entering the mixing barrel 401 can be mixed, so that the mixing operation of the sand material can be realized.

[0065] Embodiment 2:

[0066] Based on the above embodiment 1, further description is given.

[0067] See also Figure 4 and Figure 5 Specifically, a plurality of water outlet ports of the spray water pipe group 202 are fixedly installed with rotating nozzles 2021 , and the spray coverage area of ​​the rotating nozzles 2021 is larger than the opening cross-sectional area of ​​the powder box 205 .

[0068] The rotating nozzle 2021 can utilize the water flow to generate its own rotation, thereby increasing the spraying area and ensuring that the inside of the powder box 205 can be sprayed and cleaned.

[0069] Specifically, the feeding funnel 201 is a sloped structure, and a protective plate 2011 is fixedly provided at the opening of the feeding funnel 201 . The length of the protective plate 2011 is half of the opening length of the feeding funnel 201 .

[0070] When the sand material is crushed in the powder box 205, sand material splashing may occur. The protection plate 2011 can block the splashing sand material to a certain extent, thereby reducing the waste caused by splashing after the sand material is fed into the powder box 205.

[0071] Specifically, four crushing rollers 206 are arranged inside the powder box 205, and the four crushing rollers 206 are arranged up and down in a quadrilateral. Two reduction motors 207 are arranged outside the powder box 205, and the operating frequency and rotation amplitude of the two reduction motors 207 are the same.

[0072] The two reduction motors 207 respectively control the corresponding driving gears 208 to rotate, and then cooperate with the driven gear 209 to control the four crushing rollers 206 to rotate synchronously. The two crushing rollers 206 located at the top can perform the first crushing work, and the two crushing rollers 206 located at the bottom can perform the second crushing work. The two crushing rollers 206 located at the bottom can better crush the sand material at the bottom of the powder box 205, ultimately ensuring the crushing effect.

[0073] See also Figure 6 , Figure 7 and Figure 8 Specifically, the pipe width value of the control funnel 301 is five times the aperture value of the screen 302, and the pipe length value of the control funnel 301 is fifty times the aperture value of the screen 302. The electromagnetic flow valve 304 moves along the extension direction of the width of the control funnel 301. When the control value pipe width value is low, the sensitivity of the electromagnetic flow valve 304 to control the pipe closing or opening can be guaranteed, thereby ensuring the sensitivity of the control amount.

[0074] Specifically, a vibration generator 3011 is fixedly installed inside the inner wall of the control funnel 301. During the feeding process, the vibration generator 3011 is powered on to achieve vibration of the vibration generator 3011, thereby making the sand material on the control funnel 301 flow down as much as possible to avoid the sand material from piling up or even clogging at the control funnel 301.

[0075] Specifically, a pressure sensor 3061 is fixedly mounted on the weighing flap 306, and the sensing surface of the pressure sensor 3061 covers the entire upper end surface of the weighing flap 306. When the sand material reaches the upper end surface of the weighing flap 306, the pressure sensor 3061 weighs it, and then when the pressure sensor 3061 weighs to a certain value, the weighing flap 306 flips over to discharge the material, and then flips back to the initial position and weighs again. The difference between the two weighings is the weight value of the discharged material.

[0076] Specifically, the inner side of the discharge pipe 305 is provided with an arc-shaped chute 3051, and the side of the weighing flap 306 is an arc-shaped surface. The arc-shaped surface fits the arc-shaped chute 3051, which can ensure sealing during weighing and ensure the stability of the material during unloading.

[0077] See also Fig. 9Specifically, a timing electromagnetic valve 4021 is fixedly installed on the outer side of the discharge port 402. Setting the opening and closing time of the timing electromagnetic valve 4021 can ensure sufficient mixing and achieve timed material discharge.

[0078] Working principle:

[0079] When the automatic flow control device of the entire sand mixer is in operation, the main material of the sand enters from the feeding funnel 201 of the main material feeding assembly, and then reaches the inside of the distribution box 205 along the slope direction of the feeding funnel 201, and then the reduction motor 207 works and controls the driving gear 208 to rotate. At this time, the driven gear 209 rotates synchronously in the opposite direction, and then the corresponding two crushing rollers 206 rotate synchronously in the opposite direction to achieve the crushing of the sand. When the crushed sand reaches the screen 302, the sand with qualified particle size after crushing passes through the screen 302 and reaches the control funnel 301, and the sand with unqualified particle size after crushing is retained above the screen 302 and is continuously crushed with the rotation of the crushing roller 206 below until it passes through the screen 302.

[0080] Then, the sand material passes through the quantity control funnel 301 and reaches the weighing flap 306 for weighing. When the weighing weight on the weighing flap 306 reaches a certain value, a signal is sent, and the electromagnetic flow valve 304 controls the quantity control funnel 301 to stop unloading. Then, the stepper motor 307 controls the weighing flap 306 to flip and unload the material, and then returns and weighs again. At this time, the electromagnetic flow valve 304 is used again to control the quantity control funnel 301 to unload the material. In this way, the weight control of the unloading can be completed, that is, the flow control is realized.

[0081] Similarly, the auxiliary materials of the sand material are fed from the auxiliary material feeding component, and then the flow rate is controlled by the corresponding flow control component 3.

[0082] After the main material and the auxiliary material are fed and the quantity is controlled, they are fed into the mixing barrel 401 of the mixing component 4. At this time, the mixing drive motor 403 controls the rotation of the mixing shaft 404 to mix the sand material entering the mixing barrel 401. When the mixing time reaches the set time of the timing solenoid valve 4021, the feeding is automatically started.

[0083] In this way, the quantity control and batching operation of the sand mixer can be completed, and during the batching process, an external water source can be connected through the water pump 204, and then the flushing water is directed to the spray water pipe group 202 by the water guide pipe 203 to complete the flushing and cleaning.

[0084] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic flow control device for a sand mixer, comprising a main support (1), characterized in that: A crushing component (2) is arranged at the middle and upper part of the inner side of the main support (1), a flow control component (3) is arranged at the middle part of the inner side of the main support (1), and a mixing component (4) is arranged at the middle and lower part of the inner side of the main support (1); The crushed material assembly (2) comprises a main material feeding assembly and an auxiliary material feeding assembly, wherein the main material feeding assembly comprises a feeding funnel (201), a spray water pipe assembly (202) is arranged directly above the feeding funnel (201), a water inlet end of the spray water pipe assembly (202) is connected to a water guide pipe (203), one end of the water guide pipe (203) is fixedly connected to a water pump (204), and the water pump (204) is fixedly installed on the inner bottom of the main bracket (1) by bolts, and a powder box (205) is fixed at the bottom end of the feeding funnel (201), and the powder box (205) A crushing roller (206) is movably connected to the inside of the powder box (205) through a bearing, and the central rotating shaft of the crushing roller (206) extends to the outside of the feeding funnel (201). A reduction motor (207) is fixedly installed on the outside of the powder box (205). The output shaft of the reduction motor (207) is connected to a driving gear (208) through a coupling. The driving gear (208) is meshed with a driven gear (209). The driving gear (208) and the driven gear (209) are respectively fixed to the central rotating shaft of the crushing roller (206) at corresponding positions; The flow control component (3) comprises a main material quantity control component and an auxiliary material quantity control component, wherein the main material quantity control component comprises a quantity control funnel (301), the top end of the quantity control funnel (301) is fixed to the bottom end of the powder box (205), a sieve (302) is fixedly installed on the top end of the interior of the quantity control funnel (301), a protective shell (303) is fixedly arranged on the outer side of the bottom end of the quantity control funnel (301), and an electromagnetic flow valve is fixedly installed on the pipeline of the quantity control funnel (301). (304), the electromagnetic flow valve (304) is arranged inside the protective shell (303), a discharge pipe (305) is fixedly installed at the bottom end of the protective shell (303), a weighing flap (306) is arranged inside the discharge pipe (305), a stepping motor (307) is fixedly installed outside the discharge pipe (305), the output shaft of the stepping motor (307) passes through the discharge pipe (305), and is fixed to the turning shaft of the weighing flap (306) through a coupling; The mixing assembly (4) comprises a mixing barrel (401), wherein two feeding ports of the mixing barrel (401) are respectively fixed to two discharge pipes (305), a discharge port (402) is provided at the bottom end of the mixing barrel (401), a mixing drive motor (403) is fixedly mounted on the outside of the mixing barrel (401), an output shaft of the mixing drive motor (403) passes through the mixing barrel (401), and is connected to a mixing shaft (404) via a coupling.

2. The automatic flow control device for a sand mixer according to claim 1, characterized in that: Rotating nozzles (2021) are fixedly mounted at the plurality of water outlet ports of the spray water pipe group (202), and the spray coverage area of ​​the rotating nozzles (2021) is larger than the opening cross-sectional area of ​​the powder box (205).

3. The automatic flow control device for a sand mixer according to claim 1, characterized in that: The feeding funnel (201) is a sloped structure, and a protective plate (2011) is fixedly provided at the opening of the feeding funnel (201), and the length of the protective plate (2011) is half the length of the opening of the feeding funnel (201).

4. The automatic flow control device for a sand mixer according to claim 1, characterized in that: The powder box (205) is provided with four crushing rollers (206) arranged in a quadrilateral up and down. The powder box (205) is provided with two reduction motors (207) arranged outside. The operating frequency and rotation amplitude of the two reduction motors (207) are the same.

5. The automatic flow control device for a sand mixer according to claim 1, characterized in that: The channel width value of the quantity control funnel (301) is five times the aperture value of the sieve (302), and the channel length value of the quantity control funnel (301) is fifty times the aperture value of the sieve (302).

6. The automatic flow control device for a sand mixer according to claim 1, characterized in that: A vibration generator (3011) is fixedly installed inside the inner side wall of the quantity control funnel (301).

7. The automatic flow control device for a sand mixer according to claim 1, characterized in that: A pressure sensor (3061) is fixedly mounted on the weighing flap (306), and the sensing surface of the pressure sensor (3061) covers the entire upper end surface of the weighing flap (306).

8. The automatic flow control device for a sand mixer according to claim 1, characterized in that: The inner side surface of the discharge pipe (305) is provided with an arc-shaped slide groove (3051), and the side surface of the weighing flap (306) is an arc-shaped surface.

9. The automatic flow control device for a sand mixer according to claim 1, characterized in that: A timing type solenoid valve (4021) is fixedly mounted on the outer side surface of the discharge port (402).

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