A smart casting sand mixing equipment based on dynamic compensation

Abstract

This invention provides an intelligent casting sand mixing equipment based on dynamic compensation, belonging to the field of casting equipment technology. It includes a screw conveyor, a mixing drum, a rotating shaft, and a mixing paddle. A sleeve is fitted around the outer side of the shaft's propulsion section, and a helical blade is connected to the outer side of the sleeve. The shaft's propulsion section has an installation groove, and a connecting block that can slide radially along the shaft is located within the groove. By setting the helical blade and the shaft to be in two states—connectable and disconnectable—centrifugal force is used to connect the helical blade and the shaft when mixed sand needs to be fed into the mold. At this time, the mixing paddle and the helical blade rotate synchronously, pushing sand while mixing sand, hardener, and resin. When there is a short-term shutdown and sand discharge is not required, the shaft reduces its speed. At this time, the centrifugal force is small, the helical blade and the shaft disengage, and the shaft only drives the mixing paddle to rotate at a low speed to stir the sand, preventing sand solidification. The helical blade does not rotate and does not push sand.

Description

Technical Field

[0001] This invention belongs to the field of casting equipment technology, specifically referring to an intelligent casting sand mixing equipment based on dynamic compensation. Background Technology

[0002] Resin sand casting is a precision casting method that uses resin as a binder and is widely used in the production of complex castings. Its core characteristic is the rapid hardening of the sand mold through the chemical reaction between the resin and the curing agent, resulting in high precision, high strength, and environmental friendliness. The resin sand mixer is a key piece of equipment in the resin sand casting process, primarily used for the uniform mixing of resin sand, curing agent, and other materials to meet the process requirements of the casting sand. Its core function is to ensure the resin and sand particles are fully combined through efficient stirring and an intelligent feeding system, thereby improving the quality of the castings.

[0003] When the resin sand mixer stops to change the mold, the rotating shaft inside the pipe needs to stop rotating in order to prevent the resin sand from continuing to be discharged. At this time, the resin sand that has been mixed inside the pipe is in a static state. If the downtime is too long, the resin sand will solidify prematurely and become unusable, resulting in the appearance of "tailings" and increasing the loss of resin sand. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides an intelligent casting sand mixing equipment based on dynamic compensation, which at least partially solves the above problems.

[0005] The technical solution adopted by this invention is as follows: This invention proposes an intelligent casting sand mixing equipment based on dynamic compensation, comprising:

[0006] Interconnected screw conveyors and mixing drums;

[0007] The mixing drum is equipped with a rotating shaft, which includes a propulsion section and a mixing section. The propulsion section is located at the feed end of the mixing drum, and the mixing section of the rotating shaft is equipped with multiple sand mixing impellers.

[0008] The outer side of the pushing section of the rotating shaft is fitted with a sleeve, and a helical blade is connected to the outer side of the sleeve. The pushing section of the rotating shaft is provided with a mounting groove, and a connecting block that can slide radially along the rotating shaft is provided in the mounting groove. A return spring for pulling the connecting block is provided in the mounting groove.

[0009] The rotating shaft has a high-speed rotation state and a low-speed rotation state. When the rotating shaft is in the high-speed rotation state, the centrifugal force of the connecting block overcomes the tension of the return spring and slides outward to engage with the sleeve. When the rotating shaft is in the low-speed rotation state, the return spring pulls the connecting block to disengage from the sleeve.

[0010] Furthermore, the mixing drum is connected to two liquid pipes on the side near the feed end, which are used to transport the curing agent and the resin, respectively.

[0011] Furthermore, a liquid flow meter for detecting the liquid level is provided on the outer side of the end of the liquid pipe connected to the stirring tank.

[0012] Furthermore, the connecting block is provided with a friction plate at one end near the sleeve, and the inner wall of the sleeve is provided with a friction ring corresponding to the friction plate.

[0013] Furthermore, the connecting block has a limiting flange at one end located in the mounting groove, and the inner wall of the mounting groove has a limiting plate corresponding to the limiting flange.

[0014] Furthermore, the rotating shaft is also provided with a low-speed rotation state. When the rotating shaft is in the low-speed rotation state, the return spring can pull the connecting block to disengage from the sleeve.

[0015] Furthermore, the screw conveyor has an upward-opening feeding pipe at its feed end and a downward-opening conveying pipe at its discharge end.

[0016] Furthermore, the mixing drum has a feed pipe at its feed end that is rotatably connected to the conveying pipe, and a discharge pipe at its discharge end that opens downwards.

[0017] Furthermore, a cantilever is rotatably connected to the conveying pipe, and both ends of the stirring cylinder are connected to the cantilever.

[0018] Furthermore, a base is provided below the screw conveyor, and the screw conveyor is rotatably connected to the base via a bracket.

[0019] The beneficial effects achieved by the present invention using the above structure are as follows:

[0020] 1. By setting the spiral blades and rotating shaft to two states that can be connected / disconnected, when it is necessary to feed mixed sand into the mold, centrifugal force is used to connect the spiral blades and rotating shaft. At this time, the mixing paddle and the spiral blades rotate synchronously, pushing sand while mixing sand, hardener and resin. When the machine is stopped for a short time and sand discharge is not required, the rotating shaft speed is reduced. At this time, the centrifugal force is small, the spiral blades and rotating shaft are disengaged, and the rotating shaft only drives the mixing paddle to rotate at a low speed to stir the sand and prevent the sand from solidifying. The spiral blades do not rotate and do not push sand.

[0021] 2. By installing a liquid flow meter in the liquid pipe, the time it takes for the liquid to reach the mixing drum is detected. When the liquid reaches the mixing drum, the sand is pushed to the liquid pipe. This avoids the situation where the sand is pushed to the liquid pipe before the liquid has been sprayed (because the content of curing agent and resin in the sand is low) or before the liquid has been sprayed (because the content of curing agent and resin in the sand is high), which would result in the sand being sprayed too early. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an intelligent casting sand mixing equipment based on dynamic compensation proposed in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a schematic diagram of the internal structure of the mixing cylinder in an intelligent casting sand mixing equipment based on dynamic compensation, as proposed in an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of a smart casting sand mixing equipment based on dynamic compensation after the removal of the spiral blades, as proposed in an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the spiral blades and sleeve in an intelligent casting sand mixing equipment based on dynamic compensation, as proposed in an embodiment of the present invention.

[0027] Figure 6 for Figure 4 Enlarged view of point B in the middle;

[0028] Figure 7 This is a cross-sectional schematic diagram of the bonding block in an intelligent casting sand mixing equipment based on dynamic compensation, as proposed in an embodiment of the present invention.

[0029] Among them, 100 is the base; 1 is the screw conveyor; 11 is the feeding pipe; 12 is the conveying pipe; 2 is the cantilever; 3 is the mixing drum; 31 is the feed pipe; 32 is the discharge pipe; 4 is the rotating shaft; 41 is the mixing slurry; 42 is the sleeve; 43 is the spiral blade; 44 is the friction ring; 401 is the mounting groove; 5 is the liquid pipe; 6 is the liquid flow meter; 7 is the connecting block; 71 is the limiting flange; 72 is the limiting plate; 8 is the friction plate; and 9 is the return spring.

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] like Figure 1 As shown, the present invention proposes an intelligent casting sand mixing equipment based on dynamic compensation, including a base 100, a screw conveyor 1, a cantilever 2, a mixing drum 3, a liquid material pipe 5, a solid flow meter, and a control unit.

[0034] The screw conveyor 1 has an upward-opening feeding pipe 11 at its feed end. The sand mixer is installed below the sand storage box, and the feeding pipe 11 is located directly below the discharge port of the sand storage box, so that the sand discharged from the discharge port of the sand storage box can fall into the feeding pipe 11.

[0035] The discharge end of the screw conveyor 1 is provided with a downward-opening conveying pipe 12, and the feed end of the mixing drum 3 is provided with a feed pipe 31 that is rotatably connected to the conveying pipe 12. The sand input by the feeding pipe 11 is conveyed by the screw conveyor 1 to the conveying pipe 12, and falls into the feed pipe 31 along the conveying pipe 12, and then falls into the mixing drum 3 from the feed pipe 31.

[0036] The discharge end of the mixing drum 3 is provided with a discharge pipe 32 with an opening facing downwards. The sand input by the feed pipe 31 is mixed in the mixing drum 3 and then discharged through the discharge pipe 32.

[0037] Furthermore, the feed pipe 31 and the conveying pipe 12 are coaxially arranged and connected by a rotating flange, so that the feed pipe 31 and the conveying pipe 12 can rotate relative to each other. Therefore, the mixing drum 3 can rotate about the center of the feed pipe 31 as the axis of rotation, thereby adjusting the position of the discharge pipe 32.

[0038] Furthermore, a base 100 is provided below the screw conveyor 1. Inside the base 100, there is a drive motor and a reducer. The input end of the reducer is connected to the output end of the drive motor, and the output end of the reducer extends to the top of the base 100. The screw conveyor 1 is mounted on the base 100 by a bracket and connected to the output end of the reducer. After the drive motor is reduced in speed and torque is increased by the reducer, it drives the screw conveyor 1 to rotate, thereby adjusting the position of the mixing drum 3 and improving the flexibility of equipment use.

[0039] It should be noted that when the screw conveyor 1 is driven to rotate by the drive motor, the feeding pipe 11 always corresponds to the discharge port of the sand storage box, so that the sand storage box can feed sand into the feeding pipe 11 when the screw conveyor 1 rotates to any angle.

[0040] Combination Figure 1 , Figure 2 and Figure 3 As shown, the mixing drum 3 is connected to two liquid pipes 5 on the side near the feed end, which are used to transport the curing agent and the resin respectively. One end of the two liquid pipes 5 extends into the mixing drum 3, and the other end is connected to the curing agent and resin feeding equipment respectively. While feeding sand into the mixing drum 3, the two liquid pipes 5 respectively transport the curing agent and the resin into the mixing drum 3. The curing agent, resin and sand are fully mixed in the mixing drum 3.

[0041] Thus, during use, the discharge port of the sand storage box feeds sand into the feeding pipe 11, and the screw conveyor 1 transports the sand input from the feeding pipe 11 to the conveying pipe 12. The sand then falls into the mixing drum 3 through the conveying pipe 12 and the feeding pipe 31. At the same time, curing agent and resin are sprayed into the mixing drum 3 through the two liquid pipes 5. The mixture is then stirred and transported to the discharge pipe 32 for discharge. During the discharge process, the position of the discharge pipe 32 can be flexibly adjusted by the rotation between the feeding pipe 31 and the conveying pipe 12, as well as between the screw conveyor 1 and the base 100, thereby improving the flexibility of equipment use.

[0042] Combination Figure 1 , Figure 3 and Figure 4 As shown, a cantilever 2 is rotatably connected to the conveying pipe 12, and both ends of the stirring drum 3 are connected to the cantilever 2. Both ends of the stirring drum 3 are supported by the cantilever 2, and the stirring drum 3 and the cantilever 2 can rotate together.

[0043] In an optional embodiment, the mixing drum 3 consists of two symmetrical semi-circular shells, one end of which is hinged to the cantilever 2. The two semi-circular shells are fixed by multiple pipe clamps, forming a complete drum. The mixing drum 3 can be opened by removing the pipe clamps. After use, the operator can open the mixing drum 3 to clean out any residual sand inside, preventing the sand mixed with the hardener from solidifying and causing blockage.

[0044] Combination Figure 3 and Figure 4 As shown, the mixing drum 3 is equipped with a rotating shaft 4, which includes a propulsion section and a mixing section. The propulsion section is located at the feed end of the mixing drum 3 (i.e., below the feed pipe 31). The mixing section of the rotating shaft 4 is equipped with multiple sand mixing paddles 41. One end of the mixing drum 3 is equipped with a stirring motor, which is fixed on the cantilever 2. The output shaft of the stirring motor is connected to the rotating shaft 4, and the rotating shaft 4 is driven to rotate by the stirring motor.

[0045] The sand falling into the feed pipe 31 is pushed by the propulsion section of the rotating shaft 4 and pushed into the mixing section of the rotating shaft 4. The sand, curing agent and resin are fully mixed by the sand mixing slurry 41. As the sand is continuously fed in and the propulsion section continues to push, the sand in the mixing section is continuously pushed towards the discharge end of the mixing drum 3 (i.e. the discharge pipe 32) and discharged from the discharge pipe 32.

[0046] Combination Figure 3 and Figure 5 As shown, a sleeve 42 is fitted on the outer side of the propulsion section of the rotating shaft 4, and a spiral blade 43 is connected to the outer side of the sleeve 42. The rotation of the spiral blade 43 drives the sand to move.

[0047] Furthermore, bearings are provided at both ends of the sleeve 42, with the bearings located between the rotating shaft 4 and the sleeve 42. The sleeve 42 is connected to the rotating shaft 4 through the bearings, so that the sleeve 42 and the rotating shaft 4 can rotate relative to each other.

[0048] Combination Figure 4 , Figure 6 and Figure 7 As shown, the propulsion section of the rotating shaft 4 is provided with an installation groove 401. The installation groove 401 is provided with a connecting block 7 that can slide radially along the rotating shaft 4. By controlling the power of the stirring motor, the rotating shaft 4 can have a high-speed rotation state and a low-speed rotation state. When the rotating shaft 4 is in the high-speed rotation state, the centrifugal force is large. Under the action of the centrifugal force, the connecting block 7 slides outward radially along the rotating shaft 4 and presses against the inner wall of the sleeve 42. The connecting block 7 and the sleeve 42 are stably connected. The friction force drives the sleeve 42 to rotate. At this time, the spiral blades 43 on the rotating shaft 4 and the sleeve 42 rotate synchronously. The spiral blades 43 push the sand. The sand mixing slurry 41 rotates at high speed to fully mix the sand, curing agent and resin.

[0049] When the shaft 4 is rotating at low speed, the centrifugal force is small and insufficient to stably connect the connecting block 7 and the sleeve 42. At this time, the shaft 4 only drives the sand mixing 41 to rotate at low speed to stir the sand and prevent the sand from solidifying. The spiral blade 43 does not rotate and will not push the sand.

[0050] Furthermore, the mounting groove 401 is equipped with a return spring 9 for pulling the connecting block 7. The return spring 9 is a tension spring with a small elastic coefficient. When the rotating shaft 4 is in a high-speed rotation state, the centrifugal force of the connecting block 7 can overcome the tension of the return spring 9, so that the connecting block 7 is pressed against the inner wall of the sleeve 42 and the connecting block 7 is stably connected with the sleeve 42. When the rotating shaft 4 is in a low-speed rotation state, the return spring 9 can pull the connecting block 7 to completely disengage from the sleeve 42, avoiding the phenomenon of relative sliding wear due to insufficient friction.

[0051] Thus, when it is necessary to feed mixed sand into the mold, the rotating shaft 4 rotates at high speed. At this time, the centrifugal force is large, and the centrifugal force of the connecting block 7 can overcome the tension of the return spring 9. Under the action of centrifugal force, the connecting block 7 slides outward along the radial direction of the rotating shaft 4, and the connecting block 7 is pressed against the inner wall of the sleeve 42. The connecting block 7 and the sleeve 42 are stably connected, and the friction force drives the sleeve 42 to rotate. At this time, the spiral blades 43 on the rotating shaft 4 and the sleeve 42 rotate synchronously. The spiral blades 43 push the sand, and the sand mixing slurry 41 rotates at high speed to fully mix the sand, curing agent and resin. With the continuous input of sand and the continuous pushing of the propulsion section, the sand in the mixing section is continuously pushed to the discharge end of the mixing drum 3 (i.e., the discharge pipe 32) and discharged from the discharge pipe 32.

[0052] When the machine is stopped for a short time and sand discharge is not required, the shaft 4 is in a low-speed rotation state. At this time, the centrifugal force is small and insufficient to make the friction plate 8 and the sleeve 42 stably engage. The return spring 9 can pull the engaging block 7 completely disengage from the sleeve 42 to avoid the phenomenon of relative sliding wear due to insufficient friction. At this time, the shaft 4 only drives the sand mixing paddle 41 to rotate at a low speed to stir the sand and prevent the sand from solidifying. The spiral blade 43 does not rotate and will not push the sand.

[0053] This allows the sand to be stirred even when sand discharge stops, preventing the sand from solidifying and avoiding tailings.

[0054] Combination Figure 7 As shown, a friction plate 8 is provided at one end of the connecting block 7 near the sleeve 42, and a friction ring 44 corresponding to the friction plate 8 is provided on the inner wall of the sleeve 42. When the friction plate 8 and the friction ring 44 are in contact, they have a large friction force. Therefore, when the connecting block 7 is pressed against the inner wall of the sleeve 42 under the action of centrifugal force, the friction plate 8 and the friction ring 44 are in contact with each other, increasing the friction force and enabling the connecting block 7 and the sleeve 42 to be stably connected.

[0055] Combination Figure 7 As shown, the connecting block 7 is provided with a limiting flange 71 at one end located in the mounting groove 401, and the inner wall of the mounting groove 401 is provided with a limiting plate 72 corresponding to the limiting flange 71. The limiting plate 72 is detachably connected to the mounting groove 401.

[0056] As the friction plate 8 and friction ring 44 are used, they will wear. As the wear intensifies, the connecting block 7 will slide outward, gradually increasing the distance required for the friction plate 8 and friction ring 44 to engage. If either the friction plate 8 or the friction ring 44 is completely worn, continued use will cause wear on the connecting block 7 or the sleeve 42, resulting in high maintenance costs.

[0057] Therefore, by using the limiting plate 72 to limit the engagement block 7, when either the friction plate 8 or the friction ring 44 is completely worn, the limiting flange 71 can be limited and blocked by the limiting plate 72, preventing the engagement block 7 from continuing to slide outward and causing wear on the engagement block 7 or the sleeve 42. Only the friction plate 8 or the friction ring 44 needs to be replaced.

[0058] It should be noted that the initial thickness of the friction plate 8 and the friction ring 44 is the same, and the thickness value is set to h. The position of the limiting plate 72 is set such that when the sum of the wear thicknesses of the friction plate 8 and the friction ring 44 is equal to a thickness h, that is, the limiting flange 71 can be limited and blocked by the limiting plate 72.

[0059] Combination Figure 1 and Figure 2 As shown, a liquid flow meter 6 for detecting the liquid level is provided on the outer side of the end of the liquid pipe 5 that is connected to the stirring tank 3. The liquid flow meter 6 is used to detect whether there is liquid in the liquid pipe 5.

[0060] Since the liquid flow meter 6 is located at the connection between the liquid pipe 5 and the mixing drum 3, when the liquid material delivered by the external feeding equipment flows to the mixing drum 3, it can be detected by the liquid flow meter 6.

[0061] Thus, in the initial stage of mixing in the mixing drum 3, the rotating shaft 4 does not rotate and will not push sand. At the same time, the screw conveyor 1 delivers sand to the screw blades 43, filling the screw blades 43 with sand. Then, the external feeder begins to deliver liquid curing agent and resin. When the liquid flow meter 6 detects liquid, it sends feedback to the control unit. The control unit controls the mixing motor to start and makes the rotating shaft 4 rotate at high speed. The screw blades 43 rotate synchronously. Since the sand is stored in the screw blades 43 in advance, the screw blades 43 can quickly push the sand to the liquid pipe 5, avoiding the occurrence of sand being pushed to the liquid pipe 5 before the liquid pipe 5 has been sprayed (low content of curing agent and resin in the sand) or before the liquid has been sprayed (high content of curing agent and resin in the sand), which would cause initial sand.

[0062] Furthermore, since the spiral blades 43 do not rotate when the shaft 4 rotates at low speed, when sand is being fed to the spiral blades 43 in advance during the initial mixing stage of the mixing drum 3, the shaft 4 rotates at low speed. At this time, the spiral blades 43 do not push sand. When the liquid flow meter 6 detects that there is liquid and sand needs to be pushed, the shaft 4 switches from low speed to high speed. Compared with switching from stationary to high speed, the speed difference is small, the acceleration time of the spiral blades 43 is short, and the material can be fed quickly and accurately, further reducing the amount of initial sand generated.

[0063] Furthermore, a solid flow meter for detecting material flow is installed on the conveying pipe 12. Since the ratio of sand to chemical agent is fixed, the solid flow meter detects the flow rate of sand conveyed from the conveying pipe 12 to the mixing drum 3 in real time and feeds it back to the control unit. When the sand flow rate increases, the supply of chemical agent is intelligently adjusted and increased according to the preset ratio parameters of the control unit. When the sand flow rate decreases, the supply of chemical agent is intelligently adjusted and decreased according to the preset ratio parameters of the controller. The supply of chemical agent of the feeding equipment is dynamically adjusted according to the sand supply to avoid the sand and chemical agent ratio not meeting the standard due to the unstable feeding amount of the screw conveyor 1.

[0064] Meanwhile, the liquid flow meter 6 can detect the supply volume of chemical agents in real time and provide feedback to the control unit. When the supply volume is less than the preset value, the control unit intelligently adjusts and increases the supply volume. When the supply volume is greater than the preset value, the control unit intelligently adjusts and decreases the supply volume. Based on the feedback from the liquid flow meter 6 at the output end of the liquid pipe 5, the supply volume of chemical agents of the feeding equipment is dynamically adjusted to dynamically compensate for the conveying error of chemical agents and avoid the sand and agent ratio not meeting the standard due to unstable liquid supply in the conveying system.

[0065] The working principle of the present invention is as follows: When in use, the discharge port of the sand storage box feeds sand into the feeding pipe 11, and the screw conveyor 1 transports the sand input from the feeding pipe 11 to the conveying pipe 12, and the sand falls into the mixing drum 3 through the conveying pipe 12 and the feeding pipe 31. At the same time, curing agent and resin are sprayed into the mixing drum 3 through two liquid pipes 5.

[0066] When it is necessary to feed mixed sand into the mold, the rotating shaft 4 rotates at high speed. At this time, the centrifugal force is large. The centrifugal force of the connecting block 7 can overcome the tension of the return spring 9. Under the action of centrifugal force, the connecting block 7 slides outward along the radial direction of the rotating shaft 4 and presses against the inner wall of the sleeve 42. The connecting block 7 and the sleeve 42 are stably connected. The friction force drives the sleeve 42 to rotate. At this time, the spiral blades 43 on the rotating shaft 4 and the sleeve 42 rotate synchronously. The spiral blades 43 push the sand. The sand mixing slurry 41 rotates at high speed to fully mix the sand, curing agent and resin. With the continuous input of sand and the continuous pushing of the propulsion section, the sand in the mixing section is continuously pushed to the discharge end of the mixing drum 3 (i.e., the discharge pipe 32) and discharged from the discharge pipe 32.

[0067] When the machine is stopped for a short time and sand discharge is not required, the shaft 4 is in a low-speed rotation state. At this time, the centrifugal force is small and insufficient to make the friction plate 8 and the sleeve 42 stably engage. The return spring 9 can pull the engaging block 7 completely disengage from the sleeve 42 to avoid the phenomenon of relative sliding wear due to insufficient friction. At this time, the shaft 4 only drives the sand mixing paddle 41 to rotate at a low speed to stir the sand and prevent the sand from solidifying. The spiral blade 43 does not rotate and will not push the sand.

[0068] In the initial stage of mixing in the mixing drum 3, the rotating shaft 4 does not rotate and will not push sand. At the same time, the screw conveyor 1 delivers sand to the screw blades 43, filling the screw blades 43 with sand. Then, the external feeder begins to deliver liquid curing agent and resin. When the liquid flow meter 6 detects liquid, the rotating shaft 4 rotates at high speed. Since the sand is stored in the screw blades 43 in advance, it can quickly push the sand to the liquid pipe 5, avoiding the occurrence of sand being pushed to the liquid pipe 5 before the liquid pipe 5 has been sprayed (low content of curing agent and resin in the sand) or before the liquid has been sprayed (high content of curing agent and resin in the sand), which would cause initial sand.

[0069] In summary, by setting the spiral blade 43 and the rotating shaft 4 to be in two states—connectable and disconnectable—when it is necessary to feed mixed sand into the mold, centrifugal force is used to connect the spiral blade 43 and the rotating shaft 4. At this time, the mixing paddle 41 and the spiral blade 43 rotate synchronously, pushing the sand while mixing the sand, curing agent, and resin. When the machine is stopped for a short time and sand discharge is not required, the rotating shaft 4 reduces its speed. At this time, the centrifugal force is smaller, the spiral blade 43 and the rotating shaft 4 disengage, and the rotating shaft 4 only drives the mixing paddle 41 to rotate at a low speed to stir the sand and prevent the sand from solidifying. The spiral blade 43 does not rotate and does not push the sand.

[0070] By installing a liquid flow meter 6 in the liquid pipe 5, the liquid flow meter 6 is used to detect the time when the liquid reaches the mixing drum 3. When the liquid reaches the mixing drum 3, the sand is pushed to the liquid pipe 5. This avoids the situation where the sand is pushed to the liquid pipe 5 before the liquid is sprayed (the content of curing agent and resin in the sand is low) or before the liquid is sprayed (the content of curing agent and resin in the sand is high), which would cause the sand to be pushed to the liquid pipe 5.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0072] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A smart casting sand mixing equipment based on dynamic compensation, characterized in that, include: The screw conveyor (1) and the mixing drum (3) are connected to each other; The mixing drum (3) is provided with a rotating shaft (4), which includes a propulsion section and a mixing section. The propulsion section is located at the feed end of the mixing drum (3), and the mixing section of the rotating shaft (4) is provided with multiple sand mixing paddles (41). Among them, a sleeve (42) is sleeved on the outer side of the propulsion section of the rotating shaft (4), and a spiral blade (43) is connected to the outer side of the sleeve (42). The propulsion section of the rotating shaft (4) is provided with a mounting groove (401). A connecting block (7) that can slide radially along the rotating shaft (4) is provided in the mounting groove (401). A return spring (9) for pulling the connecting block (7) is provided in the mounting groove (401). The rotating shaft (4) is in a high-speed rotation state. When the rotating shaft (4) is in a high-speed rotation state, the centrifugal force of the connecting block (7) overcomes the tension of the reset spring (9) and slides outward to connect with the sleeve (42). The mixing drum (3) is connected to two liquid pipes (5) on the side near the feed end, which are used to transport the curing agent and the resin respectively. A liquid flow meter (6) for detecting the liquid level is provided on the outer side of the end where the liquid pipe (5) is connected to the stirring tank (3). The connecting block (7) is provided with a friction plate (8) at one end near the sleeve (42), and the inner wall of the sleeve (42) is provided with a friction ring (44) corresponding to the friction plate (8). The rotating shaft (4) is also provided with a low-speed rotation state. When the rotating shaft (4) is in the low-speed rotation state, the reset spring (9) can pull the connecting block (7) to disengage from the sleeve (42).

2. The intelligent casting sand mixing equipment based on dynamic compensation according to claim 1, characterized in that: The connecting block (7) is provided with a limiting flange (71) at one end located in the mounting groove (401), and the inner wall of the mounting groove (401) is provided with a limiting plate (72) corresponding to the limiting flange (71).

3. The intelligent casting sand mixing equipment based on dynamic compensation according to claim 1, characterized in that: The screw conveyor (1) has a feeding pipe (11) with an upward opening at the feeding end and a conveying pipe (12) with a downward opening at the discharging end of the screw conveyor (1).

4. The intelligent casting sand mixing equipment based on dynamic compensation according to claim 3, characterized in that: The mixing drum (3) has a feed pipe (31) at the feed end that is rotatably connected to the conveying pipe (12), and a discharge pipe (32) with an opening facing downwards at the discharge end of the mixing drum (3).

5. The intelligent casting sand mixing equipment based on dynamic compensation according to claim 4, characterized in that: A cantilever (2) is rotatably connected to the conveying pipe (12), and both ends of the stirring cylinder (3) are connected to the cantilever (2).

6. The intelligent casting sand mixing equipment based on dynamic compensation according to claim 1, characterized in that: The screw conveyor (1) is provided with a base (100) below it, and the screw conveyor (1) is rotatably connected to the base (100) by a bracket.

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