A mixing device for resin sand production

Abstract

The present invention discloses a mixing device for resin sand production, which relates to the technical field of mixers, including a resin conveying device and a sand conveying device, wherein a Y-shaped sand mixing device is arranged at the rear of the resin conveying device and the sand conveying device, and the resin conveying device includes a first screw conveyor, a first drive motor is fixedly arranged at the outer end of the first screw conveyor, a resin feeding hopper is arranged on the first screw conveyor at one side of the first drive motor, a first collecting hopper is fixedly arranged at the inner end of the first screw conveyor, a first gas storage tank is arranged at the front side of the first collecting hopper, a first barometer is arranged on the first gas storage tank, and the first collecting hopper is connected to the first gas storage tank through a first connecting pipe. The present invention conveys resin into the first screw conveyor through the resin feeding hopper, and the first drive motor provides power for the first screw conveyor, so that the resin is convenient to be collected in the first collecting hopper.

Description

Technical Field

[0001] The invention relates to the technical field of mixers, in particular to a mixing device for producing resin sand. Background Art

[0002] Resin sand mixture is an important raw material in the casting process and is widely used in casting production. It is made of resin, curing agent and sand in a certain proportion and is mainly used to manufacture precision castings and high-quality castings. The main characteristics of resin sand mixture are good fluidity, density and strength, as well as excellent heat resistance, which is suitable for high-temperature casting environment.

[0003] The invention with authorization announcement number CN111151704B discloses an integrated resin sand production and mixing machine. The invention can inject resin particles into sand and gravel at different depths during the mixing process through multiple sets of discharge pipes of different lengths to ensure uniform mixing, and cooperate with the stirring rod inside the mixing bin to disperse and stir. The heating pipe at the bottom of the material box heats and dries the sand and gravel to avoid blockage at the bottom of the material box caused by wet sand and gravel.

[0004] The above device can achieve the purpose of mixing resin and sand and gravel, but the effect of the two spiral conveying rods on the initial mixing of the resin and sand and gravel is poor, and the stirring effect cannot be achieved. The resin and sand and gravel are only dispersed and stirred by the stirring rods. Such mixing effect is poor, and when the device heats the sand and gravel, more dust will be generated, and corresponding dust removal equipment is required for dust removal operations. Therefore, a mixing device with good mixing and dust removal effect is needed. Summary of the invention

[0005] The object of the present invention is to provide a mixing device for producing resin sand to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A mixing device for resin sand production, comprising a resin conveying device and a sand conveying device, wherein a Y-shaped sand mixing device is arranged at the rear of the resin conveying device and the sand conveying device, and the resin conveying device, the sand conveying device and the Y-shaped sand mixing device are connected by two connecting hoses, and a centralized mixing device is arranged at the rear of the Y-shaped sand mixing device, and a curing agent conveying pipe is arranged on the centralized mixing device;

[0008] The Y-shaped sand mixing device comprises a Y-shaped shell, two arms of the Y-shaped shell are provided with a hollow ball cage, a hollow ball head connecting pipe is installed in the hollow ball cage, and the outer end of the hollow ball head connecting pipe is connected to a connecting hose, a first electric push rod is arranged above the hollow ball head connecting pipe, and the two ends of the first electric push rod are respectively hinged to the Y-shaped shell and the hollow ball head connecting pipe through a rotating shaft seat, the Y-shaped shell has a limit mounting portion, a mixer is installed in the limit mounting portion, and a third connecting pipe is arranged on the outside of the Y-shaped shell;

[0009] The mixer includes a worm gear motor, which has a motor output shaft therein, and the motor output shaft is a hollow rotating shaft that penetrates the worm gear motor, the worm gear motor is fixedly connected to the Y-shaped housing through a bracket, the motor output shaft is rotatably mounted in a limit mounting portion through a sealed bearing, a sleeve is fixedly provided on the motor output shaft, a rotating shaft is connected to the outer key of the sleeve, a second electric push rod is fixedly embedded in the sleeve, and the output shaft of the second electric push rod is fixedly connected to the rotating shaft, and a plurality of fan blades are fixedly provided on the rotating shaft.

[0010] As a further solution of the present invention: a transparent observation tube is arranged between the Y-shaped shell and the third connecting tube, the transparent observation tube is provided with a hole, a sampling cover is hingedly installed in the hole through a hinge, a handle is fixedly provided on the sampling cover, a first vacuum cleaner is arranged on one side of the transparent observation tube, and the transparent observation tube is connected to the air inlet of the first vacuum cleaner through the fourth connecting tube.

[0011] As a further solution of the present invention: the resin conveying device includes a first screw conveyor, a first drive motor is fixedly provided at the outer end of the first screw conveyor, a resin feeding hopper is provided on the first screw conveyor on one side of the first drive motor, a first collecting hopper is fixedly provided at the inner end of the first screw conveyor, a first gas storage tank is provided on the front side of the first collecting hopper, a first barometer is provided on the first gas storage tank, a detection probe of the first barometer extends into the first gas storage tank, the first collecting hopper is connected to the first gas storage tank through a first connecting pipe, a first solenoid valve is provided on the first connecting pipe, a first compressor is provided on the left side of the first gas storage tank, and an air outlet of the first compressor is connected to the first gas storage tank.

[0012] As a further solution of the present invention: the sand conveying device includes a second screw conveyor, a second drive motor is fixedly provided on the outer end of the second screw conveyor, a sand feeding hopper is provided on the second screw conveyor on one side of the second drive motor, a second collecting hopper is fixedly provided on the inner end of the second screw conveyor, a second air storage tank is provided on the front side of the second collecting hopper, the second collecting hopper is connected to the second air storage tank through a second connecting pipe, a second solenoid valve is fixedly provided on the second connecting pipe, a heater is fixedly provided in the second air storage tank, a second barometer is provided on the second air storage tank, a temperature sensor is provided on the outside of the second barometer on the second air storage tank, the temperature sensor and the second barometer detection probe extend into the second air storage tank, a second compressor is provided on the right side of the second air storage tank, and the air outlet of the second compressor is connected to the second air storage tank.

[0013] As a further solution of the present invention: the centralized mixing device includes an outer shell, a reduction motor is fixedly arranged above the outer shell, the curing agent delivery pipe is fixedly arranged above the outer shell and on one side of the reduction motor, a stirring rod is arranged in the outer shell and the end of the stirring rod is fixedly connected to the output shaft of the reduction motor, a second vacuum cleaner is arranged on one side of the outer shell, the outer shell is connected to the air inlet of the second vacuum cleaner by a fifth connecting pipe, a discharge pipe is fixedly arranged below the outer shell, and a third solenoid valve is fixedly arranged on the discharge pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The resin is conveyed into the first screw conveyor through the resin feeding hopper. The first driving motor provides power for the first screw conveyor, so that the resin is collected into the first collecting hopper. The high-pressure air in the first air storage tank feeds the resin in the first collecting hopper to the connecting hose through the first connecting pipe, so that the resin and dust are separated.

[0016] 2. The high-pressure gas in the second gas tank is heated by the heater, the temperature sensor monitors the temperature of the high-pressure gas, the second barometer monitors the air pressure of the second gas tank, the second screw conveyor conveys the sand to the second collecting hopper, and the high-temperature and high-pressure air conveys the sand to the connecting hose, vaporizes the water in the sand, and separates the sand from the dust, which is convenient for the subsequent dust removal work;

[0017] 3. The first electric push rod is used to reciprocate and adjust the deflection angle of the hollow ball head connecting tube in the hollow ball cage, so as to control the resin and sand to be sprayed in a fan shape at the mixer for primary mixing. The transparent observation tube is convenient for observing the status of the primary mixing. The sampling cover and the handle are used to sample the resin and sand after the primary mixing, so as to facilitate the secondary adjustment of the first electric push rod and the mixer to improve the effect of the primary mixing. The first vacuum cleaner absorbs the dust generated by the primary mixing to improve the cleanliness of the resin and sand after mixing.

[0018] 4. The worm gear motor drives several blades to rotate, and the second electric push rod controls the distance between the sleeve and the rotating shaft, which is convenient for cooperation with the hollow ball head connecting pipe, so that the resin and sand are sprayed to the blades in a fan shape, thereby improving the efficiency of the resin and sand mixing, and thus achieving a more uniform mixing effect of the resin and sand;

[0019] 5. The resin, sand and curing agent after the initial mixing are mixed by the reduction motor and the stirring rod, and the dust in the resin and sand is raised again, so that the second vacuum cleaner can perform dust removal again, so as to improve the quality of the molding sand made of resin, sand and curing agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the top structure of the present invention.

[0022] Figure 3 It is a schematic diagram of the local three-dimensional structure of the resin conveying device in the present invention.

[0023] Figure 4 It is a schematic diagram of the partial cross-sectional structure of the sand conveying device in the present invention.

[0024] Figure 5 It is a schematic diagram of the local three-dimensional structure of the Y-type sand mixing device in the present invention.

[0025] Figure 6 It is a schematic diagram of the local cross-sectional structure of the Y-type sand mixing device in the present invention.

[0026] Figure 7 It is a partial exploded view of the Y-type sand mixing device in the present invention.

[0027] Figure 8 It is a schematic diagram of the local cross-sectional structure of the centralized mixing device in the present invention.

[0028] Notes on the reference numerals: 1. resin conveying device; 11. first screw conveyor; 12. first drive motor; 13. resin hopper; 14. first collecting hopper; 15. first connecting pipe; 16. first solenoid valve; 17. first air storage tank; 18. first barometer; 19. first air compressor; 2. sand conveying device; 21. second screw conveyor; 22. second drive motor; 23. sand hopper; 24. second collecting hopper; 25. second connecting pipe; 26. second solenoid valve; 27. second air storage tank; 271. heater; 272. temperature sensor; 28. second barometer; 29. ​​second air compressor; 3. Y-type sand mixing device; 31. Y-type housing; 31 1. Limiting installation part; 32. Hollow ball cage; 33. Hollow ball head connecting pipe; 34. First electric push rod; 35. Mixer; 351. Worm gear motor; 3511. Motor output shaft; 352. Sleeve; 353. Rotating shaft; 354. Second electric push rod; 355. Fan blade; 36. Transparent observation tube; 37. Third connecting pipe; 38. Sampling cover; 381. Handle; 39. First vacuum cleaner; 391. Fourth connecting pipe; 4. Connecting hose; 5. Centralized mixing device; 51. Outer shell; 52. Speed ​​reduction motor; 53. Stirring rod; 54. Discharging pipe; 55. Third solenoid valve; 56. Second vacuum cleaner; 57. Fifth connecting pipe; 6. Curing agent delivery pipe. DETAILED DESCRIPTION

[0029] The following embodiments will be described in detail with reference to the accompanying drawings. In the drawings or descriptions, similar or identical parts use the same reference numerals, and in actual applications, the shape, thickness or height of each component may be enlarged or reduced. The embodiments listed in the present invention are only used to illustrate the present invention and are not used to limit the scope of the present invention. Any obvious modifications or changes made to the present invention do not depart from the spirit and scope of the present invention.

[0030] Example

[0031] See also Figures 1 to 8 In an embodiment of the present invention, a mixing device for resin sand production includes a resin conveying device 1 and a sand conveying device 2, a Y-type sand mixing device 3 is arranged at the rear side of the resin conveying device 1 and the sand conveying device 2, the resin conveying device 1 and the sand conveying device 2 are connected to the Y-type sand mixing device 3 through two connecting hoses 4, a centralized mixing device 5 is arranged at the rear side of the Y-type sand mixing device 3, and a curing agent conveying pipe 6 is arranged on the centralized mixing device 5.

[0032] The resin conveying device 1 comprises a first screw conveyor 11, a first drive motor 12 is fixedly provided at the outer end of the first screw conveyor 11, a resin feeding hopper 13 is provided on the first screw conveyor 11 at one side of the first drive motor 12, a first collecting hopper 14 is fixedly provided at the inner end of the first screw conveyor 11, a first gas storage tank 17 is provided in front of the first collecting hopper 14, a first barometer 18 is provided on the first gas storage tank 17, a detection probe of the first barometer 18 extends into the first gas storage tank 17, and the first collecting hopper 14 is fed into the first collecting hopper 14 through a first connecting pipe 15. The hopper 14 is connected to the first gas tank 17, the first connecting pipe 15 is provided with a first solenoid valve 16, the first gas tank 17 is provided with a first compressor 19 on the left side and the air outlet of the first gas tank 17 is connected to the first gas tank 17, the resin is transported to the first screw conveyor 11 through the resin feeding hopper 13, the first driving motor 12 provides power for the first screw conveyor 11, so that the resin is collected to the first collecting hopper 14, and the high-pressure air in the first gas tank 17 feeds the resin in the first collecting hopper 14 to the connecting hose 4 through the first connecting pipe 15, so as to separate the resin and the dust.

[0033] The sand conveying device 2 includes a second screw conveyor 21, a second drive motor 22 is fixedly provided at the outer end of the second screw conveyor 21, a sand feeding hopper 23 is provided on the second screw conveyor 21 at one side of the second drive motor 22, a second collecting hopper 24 is fixedly provided at the inner end of the second screw conveyor 21, a second gas storage tank 27 is provided on the front side of the second collecting hopper 24, the second collecting hopper 24 is connected to the second gas storage tank 27 through a second connecting pipe 25, a second solenoid valve 26 is fixedly provided on the second connecting pipe 25, a heater 271 is fixedly provided in the second gas storage tank 27, a second barometer 28 is provided on the second gas storage tank 27, and the outer surface of the second barometer 28 A temperature sensor 272 is provided on the side of the second gas tank 27, and the temperature sensor 272 and the second barometer 28 detection probe extend into the second gas tank 27. A second compressor 29 is provided on the right side of the second gas tank 27, and the air outlet of the second compressor 29 is connected to the second gas tank 27. The high-pressure gas in the second gas tank 27 is heated by the heater 271, and the temperature sensor 272 monitors the temperature of the high-pressure gas. The second barometer 28 monitors the air pressure of the second gas tank 27. The second screw conveyor 21 transports the sand to the second collecting hopper 24, and the high-temperature and high-pressure air transports the sand to the connecting hose 4, vaporizes the water in the sand, and separates the sand and dust, which is convenient for subsequent dust removal.

[0034] The Y-shaped sand mixing device 3 comprises a Y-shaped shell 31, two arms of the Y-shaped shell 31 are provided with a hollow ball cage 32, a hollow ball head connecting tube 33 is installed in the hollow ball cage 32, and the outer end of the hollow ball head connecting tube 33 is connected to the connecting hose 4, a first electric push rod 34 is arranged above the hollow ball head connecting tube 33, and the two ends of the first electric push rod 34 are respectively hinged to the Y-shaped shell 31 and the hollow ball head connecting tube 33 through a rotating shaft seat, the Y-shaped shell 31 has a limit mounting portion 311, a mixer 35 is installed in the limit mounting portion 311, a transparent observation tube 36 is arranged on the outside of the Y-shaped shell 31, a hole is opened on the transparent observation tube 36, a sampling cover 38 is hingedly installed in the hole through a hinge, and a handle 381 is fixedly provided on the sampling cover 38, A first vacuum cleaner 39 is provided on one side of the transparent observation tube 36, and the transparent observation tube 36 is connected to the air inlet of the first vacuum cleaner 39 through a fourth connecting tube 391. A third connecting tube 37 is provided on the outer side of the transparent observation tube 36. The first electric push rod 34 is used to reciprocate the deflection angle of the hollow ball head connecting tube 33 in the hollow ball cage 32, so as to control the resin and sand to be sprayed in a fan shape at the mixer 35 for primary mixing. The transparent observation tube 36 is convenient for observing the status of the primary mixing. The sampling cover 38 and the handle 381 cooperate to sample the resin and sand after the primary mixing, so as to facilitate the secondary adjustment of the first electric push rod 34 and the mixer 35 to improve the effect of the primary mixing. The first vacuum cleaner 39 absorbs the dust generated by the primary mixing to improve the cleanliness of the resin and sand after mixing.

[0035] The mixer 35 includes a worm gear motor 351, which has a motor output shaft 3511 therein, and the motor output shaft 3511 is a hollow shaft that penetrates the worm gear motor 351, and the worm gear motor 351 is fixedly connected to the Y-shaped housing 31 through a bracket, and the motor output shaft 3511 is rotatably installed in the limit mounting portion 311 through a sealed bearing, and a sleeve 352 is fixedly provided on the motor output shaft 3511, and the outer side of the sleeve 352 is keyed to a rotating shaft 353, and a second electric push rod 354 is fixedly embedded and installed in the sleeve 352, and the output shaft of the second electric push rod 354 It is fixedly connected to the rotating shaft 353, and a plurality of fan blades 355 are fixedly provided on the rotating shaft 353. The plurality of fan blades 355 are driven to rotate by the worm gear motor 351. The second electric push rod 354 controls the distance between the sleeve 352 and the rotating shaft 353 (the power cord of the second electric push rod 354 is inserted into the hollow motor output shaft 3511, and the power supply method is similar to the brush power supply of the brush motor, which is the prior art and will not be explained here), so as to cooperate with the hollow ball head connecting tube 33, so that the resin and sand particles are sprayed to the fan blades 355 in a fan shape, thereby improving the efficiency of mixing the resin and sand particles, and thus achieving a more uniform mixing effect of the resin and sand particles.

[0036] The centralized mixing device 5 includes an outer shell 51, a reduction motor 52 is fixedly arranged above the outer shell 51, the curing agent delivery pipe 6 is fixedly arranged above the outer shell 51 and located on one side of the reduction motor 52, a stirring rod 53 is arranged in the outer shell 51, and the end of the stirring rod 53 is fixedly connected to the output shaft of the reduction motor 52, a second vacuum cleaner 56 is arranged on one side of the outer shell 51, and the outer shell 51 and the air inlet of the second vacuum cleaner 56 are connected by a fifth connecting pipe 57, a discharge pipe 54 is fixedly arranged below the outer shell 51, and a third solenoid valve 55 is fixedly arranged on the discharge pipe 54, and the resin, sand and curing agent after the initial mixing are mixed by the reduction motor 52 and the stirring rod 53, and the dust in the resin and sand is raised again, so that the second vacuum cleaner 56 can perform dust removal again, so as to improve the quality of the molding sand made of resin, sand and curing agent.

[0037] When the device is used, resin is added to the resin feeding hopper 13, and sand is added to the sand feeding hopper 23, the first compressor 19 and the second compressor 29 are started, compressed air is added to the first air tank 17 and the second air tank 27, the first barometer 18 and the second barometer 28 monitor the pressure level of the first air tank 17 and the second air tank 27, the heater 271 is started to heat the compressed air in the second air tank 27, the temperature sensor 272 monitors the temperature change of the compressed air, and the heater 271 is turned off when the specified temperature is reached, the first drive motor 12 and the second drive motor 22 are started, so that the resin is fed to the first collecting hopper 14 and the sand is fed to the second collecting hopper 24, and then the first solenoid valve 16 and the second solenoid valve 26 are opened, and the resin and the sand are fed to the hollow ball head connecting pipe 33 by compressed air, and the worm gear motor 351 is started to drive a plurality of blades 355 The first vacuum cleaner 39 is started to remove moisture and dust from the resin and sand after the initial mixing. The sampling cover 38 is opened to sample the resin and sand after the initial mixing in the transparent observation tube 36 to see whether the mixing is relatively uniform. If the mixing effect is poor, the telescopic distance of the first electric push rod 34 and the speed of the worm gear motor 351 are adjusted to make the resin and sand reach a predetermined mixing degree after the initial mixing. The reduction motor 52 and the second vacuum cleaner 56 are started to allow the stirring rod 53 to fully mix the resin, sand and curing agent after the initial mixing so that the resin, sand and curing agent are evenly mixed. The second vacuum cleaner 56 removes dust generated by stirring in the centralized mixing device 5. After the mixing is completed, the third solenoid valve 55 is opened to discharge the material from the discharge pipe 54 to complete the mixing process of the resin and sand.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A mixing device for producing resin sand, comprising a resin conveying device (1) and a sand conveying device (2), characterized in that: A Y-shaped sand mixing device (3) is arranged at the rear side of the resin conveying device (1) and the sand conveying device (2); the resin conveying device (1) and the sand conveying device (2) are connected to the Y-shaped sand mixing device (3) via two connecting hoses (4); a centralized material mixing device (5) is arranged at the rear side of the Y-shaped sand mixing device (3); and a curing agent conveying pipe (6) is arranged on the centralized material mixing device (5); The Y-shaped sand mixing device (3) comprises a Y-shaped shell (31), two arms of the Y-shaped shell (31) are provided with a hollow ball cage (32), a hollow ball head connecting pipe (33) is installed in the hollow ball cage (32), and the outer end of the hollow ball head connecting pipe (33) is connected to a connecting hose (4), a first electric push rod (34) is arranged above the hollow ball head connecting pipe (33), and the two ends of the first electric push rod (34) are respectively hinged to the Y-shaped shell (31) and the hollow ball head connecting pipe (33) through a rotating shaft seat, the Y-shaped shell (31) has a limit installation part (311), a mixer (35) is installed in the limit installation part (311), and a third connecting pipe (37) is arranged on the outside of the Y-shaped shell (31); The mixer (35) comprises a worm gear motor (351), wherein the worm gear motor (351) has a motor output shaft (3511) therein, and the motor output shaft (3511) is a hollow rotating shaft that penetrates the worm gear motor (351), the worm gear motor (351) is fixedly connected to the Y-shaped housing (31) via a bracket, the motor output shaft (3511) is rotatably mounted in the limit mounting portion (311) via a sealed bearing, a sleeve (352) is fixedly arranged on the motor output shaft (3511), the outer side of the sleeve (352) is keyed to a rotating shaft (353), a second electric push rod (354) is fixedly embedded and installed in the sleeve (352), and the output shaft of the second electric push rod (354) is fixedly connected to the rotating shaft (353), and a plurality of fan blades (355) are fixedly arranged on the rotating shaft (353).

2. The resin sand production mixing device according to claim 1, characterized in that: A transparent observation tube (36) is provided between the Y-shaped housing (31) and the third connecting tube (37); a hole is provided on the transparent observation tube (36); a sampling cover (38) is hingedly mounted in the hole via a hinge; a handle (381) is fixedly provided on the sampling cover (38); a first vacuum cleaner (39) is provided on one side of the transparent observation tube (36); and the transparent observation tube (36) is connected to an air inlet of the first vacuum cleaner (39) via a fourth connecting tube (391).

3. The resin sand production mixing device according to claim 1 or 2, characterized in that: The resin conveying device (1) comprises a first screw conveyor (11), a first drive motor (12) being fixedly arranged at the outer end of the first screw conveyor (11), a resin feeding hopper (13) being arranged on the first screw conveyor (11) and located on one side of the first drive motor (12), a first collecting hopper (14) being fixedly arranged at the inner end of the first screw conveyor (11), a first gas storage tank (17) being arranged in front of the first collecting hopper (14), a first barometer (18) being arranged on the first gas storage tank (17), a detection probe of the first barometer (18) extending into the first gas storage tank (17), the first collecting hopper (14) being connected to the first gas storage tank (17) via a first connecting pipe (15), a first solenoid valve (16) being arranged on the first connecting pipe (15), a first air compressor (19) being arranged on the left side of the first gas storage tank (17), and an air outlet of the first air compressor (19) being connected to the first gas storage tank (17).

4. The resin sand production mixing device according to claim 3, characterized in that: The sand conveying device (2) comprises a second screw conveyor (21), a second drive motor (22) is fixedly provided at the outer end of the second screw conveyor (21), a sand feeding hopper (23) is provided on the second screw conveyor (21) and located on one side of the second drive motor (22), a second collecting hopper (24) is fixedly provided at the inner end of the second screw conveyor (21), a second gas storage tank (27) is provided on the front side of the second collecting hopper (24), the second collecting hopper (24) is connected to the second gas storage tank (27) via a second connecting pipe (25), and the second connecting pipe (25) is connected to the second collecting hopper (24). 5) is fixedly provided with a second solenoid valve (26), a heater (271) is fixedly provided inside the second gas storage tank (27), a second barometer (28) is provided on the second gas storage tank (27), a temperature sensor (272) is provided on the outside of the second barometer (28) and on the second gas storage tank (27), a detection probe of the temperature sensor (272) and the second barometer (28) extends into the second gas storage tank (27), a second compressor (29) is provided on the right side of the second gas storage tank (27), and an air outlet of the second compressor (29) is connected to the second gas storage tank (27).

5. The resin sand production mixing device according to claim 4, characterized in that: The centralized mixing device (5) comprises an outer shell (51), a reduction motor (52) is fixedly arranged above the outer shell (51), the curing agent delivery pipe (6) is fixedly arranged above the outer shell (51) and located on one side of the reduction motor (52), a stirring rod (53) is arranged inside the outer shell (51), and the end of the stirring rod (53) is fixedly connected to the output shaft of the reduction motor (52), a second dust collector (56) is arranged on one side of the outer shell (51), and the outer shell (51) and the air inlet of the second dust collector (56) are connected via a fifth connecting pipe (57), and a discharge pipe (54) is fixedly arranged below the outer shell (51), and a third solenoid valve (55) is fixedly arranged on the discharge pipe (54).

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